1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) ST-Ericsson SA 2012
4 *
5 * Charger driver for AB8500
6 *
7 * Author:
8 * Johan Palsson <johan.palsson@stericsson.com>
9 * Karl Komierowski <karl.komierowski@stericsson.com>
10 * Arun R Murthy <arun.murthy@stericsson.com>
11 */
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/device.h>
16 #include <linux/interrupt.h>
17 #include <linux/delay.h>
18 #include <linux/notifier.h>
19 #include <linux/slab.h>
20 #include <linux/platform_device.h>
21 #include <linux/power_supply.h>
22 #include <linux/completion.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/err.h>
25 #include <linux/workqueue.h>
26 #include <linux/kobject.h>
27 #include <linux/of.h>
28 #include <linux/mfd/core.h>
29 #include <linux/mfd/abx500/ab8500.h>
30 #include <linux/mfd/abx500.h>
31 #include <linux/mfd/abx500/ab8500-bm.h>
32 #include <linux/mfd/abx500/ab8500-gpadc.h>
33 #include <linux/mfd/abx500/ux500_chargalg.h>
34 #include <linux/usb/otg.h>
35 #include <linux/mutex.h>
36
37 /* Charger constants */
38 #define NO_PW_CONN 0
39 #define AC_PW_CONN 1
40 #define USB_PW_CONN 2
41
42 #define MAIN_WDOG_ENA 0x01
43 #define MAIN_WDOG_KICK 0x02
44 #define MAIN_WDOG_DIS 0x00
45 #define CHARG_WD_KICK 0x01
46 #define MAIN_CH_ENA 0x01
47 #define MAIN_CH_NO_OVERSHOOT_ENA_N 0x02
48 #define USB_CH_ENA 0x01
49 #define USB_CHG_NO_OVERSHOOT_ENA_N 0x02
50 #define MAIN_CH_DET 0x01
51 #define MAIN_CH_CV_ON 0x04
52 #define USB_CH_CV_ON 0x08
53 #define VBUS_DET_DBNC100 0x02
54 #define VBUS_DET_DBNC1 0x01
55 #define OTP_ENABLE_WD 0x01
56 #define DROP_COUNT_RESET 0x01
57 #define USB_CH_DET 0x01
58
59 #define MAIN_CH_INPUT_CURR_SHIFT 4
60 #define VBUS_IN_CURR_LIM_SHIFT 4
61 #define AUTO_VBUS_IN_CURR_LIM_SHIFT 4
62 #define VBUS_IN_CURR_LIM_RETRY_SET_TIME 30 /* seconds */
63
64 #define LED_INDICATOR_PWM_ENA 0x01
65 #define LED_INDICATOR_PWM_DIS 0x00
66 #define LED_IND_CUR_5MA 0x04
67 #define LED_INDICATOR_PWM_DUTY_252_256 0xBF
68
69 /* HW failure constants */
70 #define MAIN_CH_TH_PROT 0x02
71 #define VBUS_CH_NOK 0x08
72 #define USB_CH_TH_PROT 0x02
73 #define VBUS_OVV_TH 0x01
74 #define MAIN_CH_NOK 0x01
75 #define VBUS_DET 0x80
76
77 #define MAIN_CH_STATUS2_MAINCHGDROP 0x80
78 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC 0x40
79 #define USB_CH_VBUSDROP 0x40
80 #define USB_CH_VBUSDETDBNC 0x01
81
82 /* UsbLineStatus register bit masks */
83 #define AB8500_USB_LINK_STATUS 0x78
84 #define AB8505_USB_LINK_STATUS 0xF8
85 #define AB8500_STD_HOST_SUSP 0x18
86 #define USB_LINK_STATUS_SHIFT 3
87
88 /* Watchdog timeout constant */
89 #define WD_TIMER 0x30 /* 4min */
90 #define WD_KICK_INTERVAL (60 * HZ)
91
92 /* Lowest charger voltage is 3.39V -> 0x4E */
93 #define LOW_VOLT_REG 0x4E
94
95 /* Step up/down delay in us */
96 #define STEP_UDELAY 1000
97
98 #define CHARGER_STATUS_POLL 10 /* in ms */
99
100 #define CHG_WD_INTERVAL (60 * HZ)
101
102 #define AB8500_SW_CONTROL_FALLBACK 0x03
103 /* Wait for enumeration before charing in us */
104 #define WAIT_ACA_RID_ENUMERATION (5 * 1000)
105 /*External charger control*/
106 #define AB8500_SYS_CHARGER_CONTROL_REG 0x52
107 #define EXTERNAL_CHARGER_DISABLE_REG_VAL 0x03
108 #define EXTERNAL_CHARGER_ENABLE_REG_VAL 0x07
109
110 /* UsbLineStatus register - usb types */
111 enum ab8500_charger_link_status {
112 USB_STAT_NOT_CONFIGURED,
113 USB_STAT_STD_HOST_NC,
114 USB_STAT_STD_HOST_C_NS,
115 USB_STAT_STD_HOST_C_S,
116 USB_STAT_HOST_CHG_NM,
117 USB_STAT_HOST_CHG_HS,
118 USB_STAT_HOST_CHG_HS_CHIRP,
119 USB_STAT_DEDICATED_CHG,
120 USB_STAT_ACA_RID_A,
121 USB_STAT_ACA_RID_B,
122 USB_STAT_ACA_RID_C_NM,
123 USB_STAT_ACA_RID_C_HS,
124 USB_STAT_ACA_RID_C_HS_CHIRP,
125 USB_STAT_HM_IDGND,
126 USB_STAT_RESERVED,
127 USB_STAT_NOT_VALID_LINK,
128 USB_STAT_PHY_EN,
129 USB_STAT_SUP_NO_IDGND_VBUS,
130 USB_STAT_SUP_IDGND_VBUS,
131 USB_STAT_CHARGER_LINE_1,
132 USB_STAT_CARKIT_1,
133 USB_STAT_CARKIT_2,
134 USB_STAT_ACA_DOCK_CHARGER,
135 };
136
137 enum ab8500_usb_state {
138 AB8500_BM_USB_STATE_RESET_HS, /* HighSpeed Reset */
139 AB8500_BM_USB_STATE_RESET_FS, /* FullSpeed/LowSpeed Reset */
140 AB8500_BM_USB_STATE_CONFIGURED,
141 AB8500_BM_USB_STATE_SUSPEND,
142 AB8500_BM_USB_STATE_RESUME,
143 AB8500_BM_USB_STATE_MAX,
144 };
145
146 /* VBUS input current limits supported in AB8500 in mA */
147 #define USB_CH_IP_CUR_LVL_0P05 50
148 #define USB_CH_IP_CUR_LVL_0P09 98
149 #define USB_CH_IP_CUR_LVL_0P19 193
150 #define USB_CH_IP_CUR_LVL_0P29 290
151 #define USB_CH_IP_CUR_LVL_0P38 380
152 #define USB_CH_IP_CUR_LVL_0P45 450
153 #define USB_CH_IP_CUR_LVL_0P5 500
154 #define USB_CH_IP_CUR_LVL_0P6 600
155 #define USB_CH_IP_CUR_LVL_0P7 700
156 #define USB_CH_IP_CUR_LVL_0P8 800
157 #define USB_CH_IP_CUR_LVL_0P9 900
158 #define USB_CH_IP_CUR_LVL_1P0 1000
159 #define USB_CH_IP_CUR_LVL_1P1 1100
160 #define USB_CH_IP_CUR_LVL_1P3 1300
161 #define USB_CH_IP_CUR_LVL_1P4 1400
162 #define USB_CH_IP_CUR_LVL_1P5 1500
163
164 #define VBAT_TRESH_IP_CUR_RED 3800
165
166 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
167 struct ab8500_charger, usb_chg)
168 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
169 struct ab8500_charger, ac_chg)
170
171 /**
172 * struct ab8500_charger_interrupts - ab8500 interupts
173 * @name: name of the interrupt
174 * @isr function pointer to the isr
175 */
176 struct ab8500_charger_interrupts {
177 char *name;
178 irqreturn_t (*isr)(int irq, void *data);
179 };
180
181 struct ab8500_charger_info {
182 int charger_connected;
183 int charger_online;
184 int charger_voltage;
185 int cv_active;
186 bool wd_expired;
187 int charger_current;
188 };
189
190 struct ab8500_charger_event_flags {
191 bool mainextchnotok;
192 bool main_thermal_prot;
193 bool usb_thermal_prot;
194 bool vbus_ovv;
195 bool usbchargernotok;
196 bool chgwdexp;
197 bool vbus_collapse;
198 bool vbus_drop_end;
199 };
200
201 struct ab8500_charger_usb_state {
202 int usb_current;
203 int usb_current_tmp;
204 enum ab8500_usb_state state;
205 enum ab8500_usb_state state_tmp;
206 spinlock_t usb_lock;
207 };
208
209 struct ab8500_charger_max_usb_in_curr {
210 int usb_type_max;
211 int set_max;
212 int calculated_max;
213 };
214
215 /**
216 * struct ab8500_charger - ab8500 Charger device information
217 * @dev: Pointer to the structure device
218 * @vbus_detected: VBUS detected
219 * @vbus_detected_start:
220 * VBUS detected during startup
221 * @ac_conn: This will be true when the AC charger has been plugged
222 * @vddadc_en_ac: Indicate if VDD ADC supply is enabled because AC
223 * charger is enabled
224 * @vddadc_en_usb: Indicate if VDD ADC supply is enabled because USB
225 * charger is enabled
226 * @vbat Battery voltage
227 * @old_vbat Previously measured battery voltage
228 * @usb_device_is_unrecognised USB device is unrecognised by the hardware
229 * @autopower Indicate if we should have automatic pwron after pwrloss
230 * @autopower_cfg platform specific power config support for "pwron after pwrloss"
231 * @invalid_charger_detect_state State when forcing AB to use invalid charger
232 * @is_aca_rid: Incicate if accessory is ACA type
233 * @current_stepping_sessions:
234 * Counter for current stepping sessions
235 * @parent: Pointer to the struct ab8500
236 * @gpadc: Pointer to the struct gpadc
237 * @bm: Platform specific battery management information
238 * @flags: Structure for information about events triggered
239 * @usb_state: Structure for usb stack information
240 * @max_usb_in_curr: Max USB charger input current
241 * @ac_chg: AC charger power supply
242 * @usb_chg: USB charger power supply
243 * @ac: Structure that holds the AC charger properties
244 * @usb: Structure that holds the USB charger properties
245 * @regu: Pointer to the struct regulator
246 * @charger_wq: Work queue for the IRQs and checking HW state
247 * @usb_ipt_crnt_lock: Lock to protect VBUS input current setting from mutuals
248 * @pm_lock: Lock to prevent system to suspend
249 * @check_vbat_work Work for checking vbat threshold to adjust vbus current
250 * @check_hw_failure_work: Work for checking HW state
251 * @check_usbchgnotok_work: Work for checking USB charger not ok status
252 * @kick_wd_work: Work for kicking the charger watchdog in case
253 * of ABB rev 1.* due to the watchog logic bug
254 * @ac_charger_attached_work: Work for checking if AC charger is still
255 * connected
256 * @usb_charger_attached_work: Work for checking if USB charger is still
257 * connected
258 * @ac_work: Work for checking AC charger connection
259 * @detect_usb_type_work: Work for detecting the USB type connected
260 * @usb_link_status_work: Work for checking the new USB link status
261 * @usb_state_changed_work: Work for checking USB state
262 * @attach_work: Work for detecting USB type
263 * @vbus_drop_end_work: Work for detecting VBUS drop end
264 * @check_main_thermal_prot_work:
265 * Work for checking Main thermal status
266 * @check_usb_thermal_prot_work:
267 * Work for checking USB thermal status
268 * @charger_attached_mutex: For controlling the wakelock
269 */
270 struct ab8500_charger {
271 struct device *dev;
272 bool vbus_detected;
273 bool vbus_detected_start;
274 bool ac_conn;
275 bool vddadc_en_ac;
276 bool vddadc_en_usb;
277 int vbat;
278 int old_vbat;
279 bool usb_device_is_unrecognised;
280 bool autopower;
281 bool autopower_cfg;
282 int invalid_charger_detect_state;
283 int is_aca_rid;
284 atomic_t current_stepping_sessions;
285 struct ab8500 *parent;
286 struct ab8500_gpadc *gpadc;
287 struct abx500_bm_data *bm;
288 struct ab8500_charger_event_flags flags;
289 struct ab8500_charger_usb_state usb_state;
290 struct ab8500_charger_max_usb_in_curr max_usb_in_curr;
291 struct ux500_charger ac_chg;
292 struct ux500_charger usb_chg;
293 struct ab8500_charger_info ac;
294 struct ab8500_charger_info usb;
295 struct regulator *regu;
296 struct workqueue_struct *charger_wq;
297 struct mutex usb_ipt_crnt_lock;
298 struct delayed_work check_vbat_work;
299 struct delayed_work check_hw_failure_work;
300 struct delayed_work check_usbchgnotok_work;
301 struct delayed_work kick_wd_work;
302 struct delayed_work usb_state_changed_work;
303 struct delayed_work attach_work;
304 struct delayed_work ac_charger_attached_work;
305 struct delayed_work usb_charger_attached_work;
306 struct delayed_work vbus_drop_end_work;
307 struct work_struct ac_work;
308 struct work_struct detect_usb_type_work;
309 struct work_struct usb_link_status_work;
310 struct work_struct check_main_thermal_prot_work;
311 struct work_struct check_usb_thermal_prot_work;
312 struct usb_phy *usb_phy;
313 struct notifier_block nb;
314 struct mutex charger_attached_mutex;
315 };
316
317 /* AC properties */
318 static enum power_supply_property ab8500_charger_ac_props[] = {
319 POWER_SUPPLY_PROP_HEALTH,
320 POWER_SUPPLY_PROP_PRESENT,
321 POWER_SUPPLY_PROP_ONLINE,
322 POWER_SUPPLY_PROP_VOLTAGE_NOW,
323 POWER_SUPPLY_PROP_VOLTAGE_AVG,
324 POWER_SUPPLY_PROP_CURRENT_NOW,
325 };
326
327 /* USB properties */
328 static enum power_supply_property ab8500_charger_usb_props[] = {
329 POWER_SUPPLY_PROP_HEALTH,
330 POWER_SUPPLY_PROP_CURRENT_AVG,
331 POWER_SUPPLY_PROP_PRESENT,
332 POWER_SUPPLY_PROP_ONLINE,
333 POWER_SUPPLY_PROP_VOLTAGE_NOW,
334 POWER_SUPPLY_PROP_VOLTAGE_AVG,
335 POWER_SUPPLY_PROP_CURRENT_NOW,
336 };
337
338 /*
339 * Function for enabling and disabling sw fallback mode
340 * should always be disabled when no charger is connected.
341 */
ab8500_enable_disable_sw_fallback(struct ab8500_charger * di,bool fallback)342 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
343 bool fallback)
344 {
345 u8 val;
346 u8 reg;
347 u8 bank;
348 u8 bit;
349 int ret;
350
351 dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
352
353 if (is_ab8500(di->parent)) {
354 bank = 0x15;
355 reg = 0x0;
356 bit = 3;
357 } else {
358 bank = AB8500_SYS_CTRL1_BLOCK;
359 reg = AB8500_SW_CONTROL_FALLBACK;
360 bit = 0;
361 }
362
363 /* read the register containing fallback bit */
364 ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
365 if (ret < 0) {
366 dev_err(di->dev, "%d read failed\n", __LINE__);
367 return;
368 }
369
370 if (is_ab8500(di->parent)) {
371 /* enable the OPT emulation registers */
372 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
373 if (ret) {
374 dev_err(di->dev, "%d write failed\n", __LINE__);
375 goto disable_otp;
376 }
377 }
378
379 if (fallback)
380 val |= (1 << bit);
381 else
382 val &= ~(1 << bit);
383
384 /* write back the changed fallback bit value to register */
385 ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
386 if (ret) {
387 dev_err(di->dev, "%d write failed\n", __LINE__);
388 }
389
390 disable_otp:
391 if (is_ab8500(di->parent)) {
392 /* disable the set OTP registers again */
393 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
394 if (ret) {
395 dev_err(di->dev, "%d write failed\n", __LINE__);
396 }
397 }
398 }
399
400 /**
401 * ab8500_power_supply_changed - a wrapper with local extentions for
402 * power_supply_changed
403 * @di: pointer to the ab8500_charger structure
404 * @psy: pointer to power_supply_that have changed.
405 *
406 */
ab8500_power_supply_changed(struct ab8500_charger * di,struct power_supply * psy)407 static void ab8500_power_supply_changed(struct ab8500_charger *di,
408 struct power_supply *psy)
409 {
410 if (di->autopower_cfg) {
411 if (!di->usb.charger_connected &&
412 !di->ac.charger_connected &&
413 di->autopower) {
414 di->autopower = false;
415 ab8500_enable_disable_sw_fallback(di, false);
416 } else if (!di->autopower &&
417 (di->ac.charger_connected ||
418 di->usb.charger_connected)) {
419 di->autopower = true;
420 ab8500_enable_disable_sw_fallback(di, true);
421 }
422 }
423 power_supply_changed(psy);
424 }
425
ab8500_charger_set_usb_connected(struct ab8500_charger * di,bool connected)426 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
427 bool connected)
428 {
429 if (connected != di->usb.charger_connected) {
430 dev_dbg(di->dev, "USB connected:%i\n", connected);
431 di->usb.charger_connected = connected;
432
433 if (!connected)
434 di->flags.vbus_drop_end = false;
435
436 sysfs_notify(&di->usb_chg.psy->dev.kobj, NULL, "present");
437
438 if (connected) {
439 mutex_lock(&di->charger_attached_mutex);
440 mutex_unlock(&di->charger_attached_mutex);
441
442 if (is_ab8500(di->parent))
443 queue_delayed_work(di->charger_wq,
444 &di->usb_charger_attached_work,
445 HZ);
446 } else {
447 cancel_delayed_work_sync(&di->usb_charger_attached_work);
448 mutex_lock(&di->charger_attached_mutex);
449 mutex_unlock(&di->charger_attached_mutex);
450 }
451 }
452 }
453
454 /**
455 * ab8500_charger_get_ac_voltage() - get ac charger voltage
456 * @di: pointer to the ab8500_charger structure
457 *
458 * Returns ac charger voltage (on success)
459 */
ab8500_charger_get_ac_voltage(struct ab8500_charger * di)460 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
461 {
462 int vch;
463
464 /* Only measure voltage if the charger is connected */
465 if (di->ac.charger_connected) {
466 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
467 if (vch < 0)
468 dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
469 } else {
470 vch = 0;
471 }
472 return vch;
473 }
474
475 /**
476 * ab8500_charger_ac_cv() - check if the main charger is in CV mode
477 * @di: pointer to the ab8500_charger structure
478 *
479 * Returns ac charger CV mode (on success) else error code
480 */
ab8500_charger_ac_cv(struct ab8500_charger * di)481 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
482 {
483 u8 val;
484 int ret = 0;
485
486 /* Only check CV mode if the charger is online */
487 if (di->ac.charger_online) {
488 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
489 AB8500_CH_STATUS1_REG, &val);
490 if (ret < 0) {
491 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
492 return 0;
493 }
494
495 if (val & MAIN_CH_CV_ON)
496 ret = 1;
497 else
498 ret = 0;
499 }
500
501 return ret;
502 }
503
504 /**
505 * ab8500_charger_get_vbus_voltage() - get vbus voltage
506 * @di: pointer to the ab8500_charger structure
507 *
508 * This function returns the vbus voltage.
509 * Returns vbus voltage (on success)
510 */
ab8500_charger_get_vbus_voltage(struct ab8500_charger * di)511 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
512 {
513 int vch;
514
515 /* Only measure voltage if the charger is connected */
516 if (di->usb.charger_connected) {
517 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
518 if (vch < 0)
519 dev_err(di->dev, "%s gpadc conv failed\n", __func__);
520 } else {
521 vch = 0;
522 }
523 return vch;
524 }
525
526 /**
527 * ab8500_charger_get_usb_current() - get usb charger current
528 * @di: pointer to the ab8500_charger structure
529 *
530 * This function returns the usb charger current.
531 * Returns usb current (on success) and error code on failure
532 */
ab8500_charger_get_usb_current(struct ab8500_charger * di)533 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
534 {
535 int ich;
536
537 /* Only measure current if the charger is online */
538 if (di->usb.charger_online) {
539 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
540 if (ich < 0)
541 dev_err(di->dev, "%s gpadc conv failed\n", __func__);
542 } else {
543 ich = 0;
544 }
545 return ich;
546 }
547
548 /**
549 * ab8500_charger_get_ac_current() - get ac charger current
550 * @di: pointer to the ab8500_charger structure
551 *
552 * This function returns the ac charger current.
553 * Returns ac current (on success) and error code on failure.
554 */
ab8500_charger_get_ac_current(struct ab8500_charger * di)555 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
556 {
557 int ich;
558
559 /* Only measure current if the charger is online */
560 if (di->ac.charger_online) {
561 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
562 if (ich < 0)
563 dev_err(di->dev, "%s gpadc conv failed\n", __func__);
564 } else {
565 ich = 0;
566 }
567 return ich;
568 }
569
570 /**
571 * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
572 * @di: pointer to the ab8500_charger structure
573 *
574 * Returns ac charger CV mode (on success) else error code
575 */
ab8500_charger_usb_cv(struct ab8500_charger * di)576 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
577 {
578 int ret;
579 u8 val;
580
581 /* Only check CV mode if the charger is online */
582 if (di->usb.charger_online) {
583 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
584 AB8500_CH_USBCH_STAT1_REG, &val);
585 if (ret < 0) {
586 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
587 return 0;
588 }
589
590 if (val & USB_CH_CV_ON)
591 ret = 1;
592 else
593 ret = 0;
594 } else {
595 ret = 0;
596 }
597
598 return ret;
599 }
600
601 /**
602 * ab8500_charger_detect_chargers() - Detect the connected chargers
603 * @di: pointer to the ab8500_charger structure
604 * @probe: if probe, don't delay and wait for HW
605 *
606 * Returns the type of charger connected.
607 * For USB it will not mean we can actually charge from it
608 * but that there is a USB cable connected that we have to
609 * identify. This is used during startup when we don't get
610 * interrupts of the charger detection
611 *
612 * Returns an integer value, that means,
613 * NO_PW_CONN no power supply is connected
614 * AC_PW_CONN if the AC power supply is connected
615 * USB_PW_CONN if the USB power supply is connected
616 * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
617 */
ab8500_charger_detect_chargers(struct ab8500_charger * di,bool probe)618 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
619 {
620 int result = NO_PW_CONN;
621 int ret;
622 u8 val;
623
624 /* Check for AC charger */
625 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
626 AB8500_CH_STATUS1_REG, &val);
627 if (ret < 0) {
628 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
629 return ret;
630 }
631
632 if (val & MAIN_CH_DET)
633 result = AC_PW_CONN;
634
635 /* Check for USB charger */
636
637 if (!probe) {
638 /*
639 * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
640 * when disconnecting ACA even though no
641 * charger was connected. Try waiting a little
642 * longer than the 100 ms of VBUS_DET_DBNC100...
643 */
644 msleep(110);
645 }
646 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
647 AB8500_CH_USBCH_STAT1_REG, &val);
648 if (ret < 0) {
649 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
650 return ret;
651 }
652 dev_dbg(di->dev,
653 "%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
654 val);
655 if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
656 result |= USB_PW_CONN;
657
658 return result;
659 }
660
661 /**
662 * ab8500_charger_max_usb_curr() - get the max curr for the USB type
663 * @di: pointer to the ab8500_charger structure
664 * @link_status: the identified USB type
665 *
666 * Get the maximum current that is allowed to be drawn from the host
667 * based on the USB type.
668 * Returns error code in case of failure else 0 on success
669 */
ab8500_charger_max_usb_curr(struct ab8500_charger * di,enum ab8500_charger_link_status link_status)670 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
671 enum ab8500_charger_link_status link_status)
672 {
673 int ret = 0;
674
675 di->usb_device_is_unrecognised = false;
676
677 /*
678 * Platform only supports USB 2.0.
679 * This means that charging current from USB source
680 * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
681 * should set USB_CH_IP_CUR_LVL_0P5.
682 */
683
684 switch (link_status) {
685 case USB_STAT_STD_HOST_NC:
686 case USB_STAT_STD_HOST_C_NS:
687 case USB_STAT_STD_HOST_C_S:
688 dev_dbg(di->dev, "USB Type - Standard host is "
689 "detected through USB driver\n");
690 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
691 di->is_aca_rid = 0;
692 break;
693 case USB_STAT_HOST_CHG_HS_CHIRP:
694 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
695 di->is_aca_rid = 0;
696 break;
697 case USB_STAT_HOST_CHG_HS:
698 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
699 di->is_aca_rid = 0;
700 break;
701 case USB_STAT_ACA_RID_C_HS:
702 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
703 di->is_aca_rid = 0;
704 break;
705 case USB_STAT_ACA_RID_A:
706 /*
707 * Dedicated charger level minus maximum current accessory
708 * can consume (900mA). Closest level is 500mA
709 */
710 dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
711 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
712 di->is_aca_rid = 1;
713 break;
714 case USB_STAT_ACA_RID_B:
715 /*
716 * Dedicated charger level minus 120mA (20mA for ACA and
717 * 100mA for potential accessory). Closest level is 1300mA
718 */
719 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
720 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
721 di->max_usb_in_curr.usb_type_max);
722 di->is_aca_rid = 1;
723 break;
724 case USB_STAT_HOST_CHG_NM:
725 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
726 di->is_aca_rid = 0;
727 break;
728 case USB_STAT_DEDICATED_CHG:
729 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
730 di->is_aca_rid = 0;
731 break;
732 case USB_STAT_ACA_RID_C_HS_CHIRP:
733 case USB_STAT_ACA_RID_C_NM:
734 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
735 di->is_aca_rid = 1;
736 break;
737 case USB_STAT_NOT_CONFIGURED:
738 if (di->vbus_detected) {
739 di->usb_device_is_unrecognised = true;
740 dev_dbg(di->dev, "USB Type - Legacy charger.\n");
741 di->max_usb_in_curr.usb_type_max =
742 USB_CH_IP_CUR_LVL_1P5;
743 break;
744 }
745 /* else, fall through */
746 case USB_STAT_HM_IDGND:
747 dev_err(di->dev, "USB Type - Charging not allowed\n");
748 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
749 ret = -ENXIO;
750 break;
751 case USB_STAT_RESERVED:
752 if (is_ab8500(di->parent)) {
753 di->flags.vbus_collapse = true;
754 dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
755 "VBUS has collapsed\n");
756 ret = -ENXIO;
757 break;
758 } else {
759 dev_dbg(di->dev, "USB Type - Charging not allowed\n");
760 di->max_usb_in_curr.usb_type_max =
761 USB_CH_IP_CUR_LVL_0P05;
762 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
763 link_status,
764 di->max_usb_in_curr.usb_type_max);
765 ret = -ENXIO;
766 break;
767 }
768 case USB_STAT_CARKIT_1:
769 case USB_STAT_CARKIT_2:
770 case USB_STAT_ACA_DOCK_CHARGER:
771 case USB_STAT_CHARGER_LINE_1:
772 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
773 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
774 di->max_usb_in_curr.usb_type_max);
775 break;
776 case USB_STAT_NOT_VALID_LINK:
777 dev_err(di->dev, "USB Type invalid - try charging anyway\n");
778 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
779 break;
780
781 default:
782 dev_err(di->dev, "USB Type - Unknown\n");
783 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
784 ret = -ENXIO;
785 break;
786 };
787
788 di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
789 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
790 link_status, di->max_usb_in_curr.set_max);
791
792 return ret;
793 }
794
795 /**
796 * ab8500_charger_read_usb_type() - read the type of usb connected
797 * @di: pointer to the ab8500_charger structure
798 *
799 * Detect the type of the plugged USB
800 * Returns error code in case of failure else 0 on success
801 */
ab8500_charger_read_usb_type(struct ab8500_charger * di)802 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
803 {
804 int ret;
805 u8 val;
806
807 ret = abx500_get_register_interruptible(di->dev,
808 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
809 if (ret < 0) {
810 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
811 return ret;
812 }
813 if (is_ab8500(di->parent))
814 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
815 AB8500_USB_LINE_STAT_REG, &val);
816 else
817 ret = abx500_get_register_interruptible(di->dev,
818 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
819 if (ret < 0) {
820 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
821 return ret;
822 }
823
824 /* get the USB type */
825 if (is_ab8500(di->parent))
826 val = (val & AB8500_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
827 else
828 val = (val & AB8505_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
829 ret = ab8500_charger_max_usb_curr(di,
830 (enum ab8500_charger_link_status) val);
831
832 return ret;
833 }
834
835 /**
836 * ab8500_charger_detect_usb_type() - get the type of usb connected
837 * @di: pointer to the ab8500_charger structure
838 *
839 * Detect the type of the plugged USB
840 * Returns error code in case of failure else 0 on success
841 */
ab8500_charger_detect_usb_type(struct ab8500_charger * di)842 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
843 {
844 int i, ret;
845 u8 val;
846
847 /*
848 * On getting the VBUS rising edge detect interrupt there
849 * is a 250ms delay after which the register UsbLineStatus
850 * is filled with valid data.
851 */
852 for (i = 0; i < 10; i++) {
853 msleep(250);
854 ret = abx500_get_register_interruptible(di->dev,
855 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
856 &val);
857 dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
858 __func__, val);
859 if (ret < 0) {
860 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
861 return ret;
862 }
863
864 if (is_ab8500(di->parent))
865 ret = abx500_get_register_interruptible(di->dev,
866 AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
867 else
868 ret = abx500_get_register_interruptible(di->dev,
869 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
870 if (ret < 0) {
871 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
872 return ret;
873 }
874 dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
875 val);
876 /*
877 * Until the IT source register is read the UsbLineStatus
878 * register is not updated, hence doing the same
879 * Revisit this:
880 */
881
882 /* get the USB type */
883 if (is_ab8500(di->parent))
884 val = (val & AB8500_USB_LINK_STATUS) >>
885 USB_LINK_STATUS_SHIFT;
886 else
887 val = (val & AB8505_USB_LINK_STATUS) >>
888 USB_LINK_STATUS_SHIFT;
889 if (val)
890 break;
891 }
892 ret = ab8500_charger_max_usb_curr(di,
893 (enum ab8500_charger_link_status) val);
894
895 return ret;
896 }
897
898 /*
899 * This array maps the raw hex value to charger voltage used by the AB8500
900 * Values taken from the UM0836
901 */
902 static int ab8500_charger_voltage_map[] = {
903 3500 ,
904 3525 ,
905 3550 ,
906 3575 ,
907 3600 ,
908 3625 ,
909 3650 ,
910 3675 ,
911 3700 ,
912 3725 ,
913 3750 ,
914 3775 ,
915 3800 ,
916 3825 ,
917 3850 ,
918 3875 ,
919 3900 ,
920 3925 ,
921 3950 ,
922 3975 ,
923 4000 ,
924 4025 ,
925 4050 ,
926 4060 ,
927 4070 ,
928 4080 ,
929 4090 ,
930 4100 ,
931 4110 ,
932 4120 ,
933 4130 ,
934 4140 ,
935 4150 ,
936 4160 ,
937 4170 ,
938 4180 ,
939 4190 ,
940 4200 ,
941 4210 ,
942 4220 ,
943 4230 ,
944 4240 ,
945 4250 ,
946 4260 ,
947 4270 ,
948 4280 ,
949 4290 ,
950 4300 ,
951 4310 ,
952 4320 ,
953 4330 ,
954 4340 ,
955 4350 ,
956 4360 ,
957 4370 ,
958 4380 ,
959 4390 ,
960 4400 ,
961 4410 ,
962 4420 ,
963 4430 ,
964 4440 ,
965 4450 ,
966 4460 ,
967 4470 ,
968 4480 ,
969 4490 ,
970 4500 ,
971 4510 ,
972 4520 ,
973 4530 ,
974 4540 ,
975 4550 ,
976 4560 ,
977 4570 ,
978 4580 ,
979 4590 ,
980 4600 ,
981 };
982
ab8500_voltage_to_regval(int voltage)983 static int ab8500_voltage_to_regval(int voltage)
984 {
985 int i;
986
987 /* Special case for voltage below 3.5V */
988 if (voltage < ab8500_charger_voltage_map[0])
989 return LOW_VOLT_REG;
990
991 for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
992 if (voltage < ab8500_charger_voltage_map[i])
993 return i - 1;
994 }
995
996 /* If not last element, return error */
997 i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
998 if (voltage == ab8500_charger_voltage_map[i])
999 return i;
1000 else
1001 return -1;
1002 }
1003
ab8500_current_to_regval(struct ab8500_charger * di,int curr)1004 static int ab8500_current_to_regval(struct ab8500_charger *di, int curr)
1005 {
1006 int i;
1007
1008 if (curr < di->bm->chg_output_curr[0])
1009 return 0;
1010
1011 for (i = 0; i < di->bm->n_chg_out_curr; i++) {
1012 if (curr < di->bm->chg_output_curr[i])
1013 return i - 1;
1014 }
1015
1016 /* If not last element, return error */
1017 i = di->bm->n_chg_out_curr - 1;
1018 if (curr == di->bm->chg_output_curr[i])
1019 return i;
1020 else
1021 return -1;
1022 }
1023
ab8500_vbus_in_curr_to_regval(struct ab8500_charger * di,int curr)1024 static int ab8500_vbus_in_curr_to_regval(struct ab8500_charger *di, int curr)
1025 {
1026 int i;
1027
1028 if (curr < di->bm->chg_input_curr[0])
1029 return 0;
1030
1031 for (i = 0; i < di->bm->n_chg_in_curr; i++) {
1032 if (curr < di->bm->chg_input_curr[i])
1033 return i - 1;
1034 }
1035
1036 /* If not last element, return error */
1037 i = di->bm->n_chg_in_curr - 1;
1038 if (curr == di->bm->chg_input_curr[i])
1039 return i;
1040 else
1041 return -1;
1042 }
1043
1044 /**
1045 * ab8500_charger_get_usb_cur() - get usb current
1046 * @di: pointer to the ab8500_charger structre
1047 *
1048 * The usb stack provides the maximum current that can be drawn from
1049 * the standard usb host. This will be in mA.
1050 * This function converts current in mA to a value that can be written
1051 * to the register. Returns -1 if charging is not allowed
1052 */
ab8500_charger_get_usb_cur(struct ab8500_charger * di)1053 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1054 {
1055 int ret = 0;
1056 switch (di->usb_state.usb_current) {
1057 case 100:
1058 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
1059 break;
1060 case 200:
1061 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
1062 break;
1063 case 300:
1064 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
1065 break;
1066 case 400:
1067 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
1068 break;
1069 case 500:
1070 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
1071 break;
1072 default:
1073 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
1074 ret = -EPERM;
1075 break;
1076 };
1077 di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
1078 return ret;
1079 }
1080
1081 /**
1082 * ab8500_charger_check_continue_stepping() - Check to allow stepping
1083 * @di: pointer to the ab8500_charger structure
1084 * @reg: select what charger register to check
1085 *
1086 * Check if current stepping should be allowed to continue.
1087 * Checks if charger source has not collapsed. If it has, further stepping
1088 * is not allowed.
1089 */
ab8500_charger_check_continue_stepping(struct ab8500_charger * di,int reg)1090 static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
1091 int reg)
1092 {
1093 if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
1094 return !di->flags.vbus_drop_end;
1095 else
1096 return true;
1097 }
1098
1099 /**
1100 * ab8500_charger_set_current() - set charger current
1101 * @di: pointer to the ab8500_charger structure
1102 * @ich: charger current, in mA
1103 * @reg: select what charger register to set
1104 *
1105 * Set charger current.
1106 * There is no state machine in the AB to step up/down the charger
1107 * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1108 * charging is started. Instead we need to implement
1109 * this charger current step-up/down here.
1110 * Returns error code in case of failure else 0(on success)
1111 */
ab8500_charger_set_current(struct ab8500_charger * di,int ich,int reg)1112 static int ab8500_charger_set_current(struct ab8500_charger *di,
1113 int ich, int reg)
1114 {
1115 int ret = 0;
1116 int curr_index, prev_curr_index, shift_value, i;
1117 u8 reg_value;
1118 u32 step_udelay;
1119 bool no_stepping = false;
1120
1121 atomic_inc(&di->current_stepping_sessions);
1122
1123 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1124 reg, ®_value);
1125 if (ret < 0) {
1126 dev_err(di->dev, "%s read failed\n", __func__);
1127 goto exit_set_current;
1128 }
1129
1130 switch (reg) {
1131 case AB8500_MCH_IPT_CURLVL_REG:
1132 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1133 prev_curr_index = (reg_value >> shift_value);
1134 curr_index = ab8500_current_to_regval(di, ich);
1135 step_udelay = STEP_UDELAY;
1136 if (!di->ac.charger_connected)
1137 no_stepping = true;
1138 break;
1139 case AB8500_USBCH_IPT_CRNTLVL_REG:
1140 shift_value = VBUS_IN_CURR_LIM_SHIFT;
1141 prev_curr_index = (reg_value >> shift_value);
1142 curr_index = ab8500_vbus_in_curr_to_regval(di, ich);
1143 step_udelay = STEP_UDELAY * 100;
1144
1145 if (!di->usb.charger_connected)
1146 no_stepping = true;
1147 break;
1148 case AB8500_CH_OPT_CRNTLVL_REG:
1149 shift_value = 0;
1150 prev_curr_index = (reg_value >> shift_value);
1151 curr_index = ab8500_current_to_regval(di, ich);
1152 step_udelay = STEP_UDELAY;
1153 if (curr_index && (curr_index - prev_curr_index) > 1)
1154 step_udelay *= 100;
1155
1156 if (!di->usb.charger_connected && !di->ac.charger_connected)
1157 no_stepping = true;
1158
1159 break;
1160 default:
1161 dev_err(di->dev, "%s current register not valid\n", __func__);
1162 ret = -ENXIO;
1163 goto exit_set_current;
1164 }
1165
1166 if (curr_index < 0) {
1167 dev_err(di->dev, "requested current limit out-of-range\n");
1168 ret = -ENXIO;
1169 goto exit_set_current;
1170 }
1171
1172 /* only update current if it's been changed */
1173 if (prev_curr_index == curr_index) {
1174 dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1175 __func__, reg);
1176 ret = 0;
1177 goto exit_set_current;
1178 }
1179
1180 dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1181 __func__, ich, reg);
1182
1183 if (no_stepping) {
1184 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1185 reg, (u8)curr_index << shift_value);
1186 if (ret)
1187 dev_err(di->dev, "%s write failed\n", __func__);
1188 } else if (prev_curr_index > curr_index) {
1189 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1190 dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1191 (u8) i << shift_value, reg);
1192 ret = abx500_set_register_interruptible(di->dev,
1193 AB8500_CHARGER, reg, (u8)i << shift_value);
1194 if (ret) {
1195 dev_err(di->dev, "%s write failed\n", __func__);
1196 goto exit_set_current;
1197 }
1198 if (i != curr_index)
1199 usleep_range(step_udelay, step_udelay * 2);
1200 }
1201 } else {
1202 bool allow = true;
1203 for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
1204 dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1205 (u8)i << shift_value, reg);
1206 ret = abx500_set_register_interruptible(di->dev,
1207 AB8500_CHARGER, reg, (u8)i << shift_value);
1208 if (ret) {
1209 dev_err(di->dev, "%s write failed\n", __func__);
1210 goto exit_set_current;
1211 }
1212 if (i != curr_index)
1213 usleep_range(step_udelay, step_udelay * 2);
1214
1215 allow = ab8500_charger_check_continue_stepping(di, reg);
1216 }
1217 }
1218
1219 exit_set_current:
1220 atomic_dec(&di->current_stepping_sessions);
1221
1222 return ret;
1223 }
1224
1225 /**
1226 * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1227 * @di: pointer to the ab8500_charger structure
1228 * @ich_in: charger input current limit
1229 *
1230 * Sets the current that can be drawn from the USB host
1231 * Returns error code in case of failure else 0(on success)
1232 */
ab8500_charger_set_vbus_in_curr(struct ab8500_charger * di,int ich_in)1233 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1234 int ich_in)
1235 {
1236 int min_value;
1237 int ret;
1238
1239 /* We should always use to lowest current limit */
1240 min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1241 if (di->max_usb_in_curr.set_max > 0)
1242 min_value = min(di->max_usb_in_curr.set_max, min_value);
1243
1244 if (di->usb_state.usb_current >= 0)
1245 min_value = min(di->usb_state.usb_current, min_value);
1246
1247 switch (min_value) {
1248 case 100:
1249 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1250 min_value = USB_CH_IP_CUR_LVL_0P05;
1251 break;
1252 case 500:
1253 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1254 min_value = USB_CH_IP_CUR_LVL_0P45;
1255 break;
1256 default:
1257 break;
1258 }
1259
1260 dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1261
1262 mutex_lock(&di->usb_ipt_crnt_lock);
1263 ret = ab8500_charger_set_current(di, min_value,
1264 AB8500_USBCH_IPT_CRNTLVL_REG);
1265 mutex_unlock(&di->usb_ipt_crnt_lock);
1266
1267 return ret;
1268 }
1269
1270 /**
1271 * ab8500_charger_set_main_in_curr() - set main charger input current
1272 * @di: pointer to the ab8500_charger structure
1273 * @ich_in: input charger current, in mA
1274 *
1275 * Set main charger input current.
1276 * Returns error code in case of failure else 0(on success)
1277 */
ab8500_charger_set_main_in_curr(struct ab8500_charger * di,int ich_in)1278 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1279 int ich_in)
1280 {
1281 return ab8500_charger_set_current(di, ich_in,
1282 AB8500_MCH_IPT_CURLVL_REG);
1283 }
1284
1285 /**
1286 * ab8500_charger_set_output_curr() - set charger output current
1287 * @di: pointer to the ab8500_charger structure
1288 * @ich_out: output charger current, in mA
1289 *
1290 * Set charger output current.
1291 * Returns error code in case of failure else 0(on success)
1292 */
ab8500_charger_set_output_curr(struct ab8500_charger * di,int ich_out)1293 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1294 int ich_out)
1295 {
1296 return ab8500_charger_set_current(di, ich_out,
1297 AB8500_CH_OPT_CRNTLVL_REG);
1298 }
1299
1300 /**
1301 * ab8500_charger_led_en() - turn on/off chargign led
1302 * @di: pointer to the ab8500_charger structure
1303 * @on: flag to turn on/off the chargign led
1304 *
1305 * Power ON/OFF charging LED indication
1306 * Returns error code in case of failure else 0(on success)
1307 */
ab8500_charger_led_en(struct ab8500_charger * di,int on)1308 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1309 {
1310 int ret;
1311
1312 if (on) {
1313 /* Power ON charging LED indicator, set LED current to 5mA */
1314 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1315 AB8500_LED_INDICATOR_PWM_CTRL,
1316 (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1317 if (ret) {
1318 dev_err(di->dev, "Power ON LED failed\n");
1319 return ret;
1320 }
1321 /* LED indicator PWM duty cycle 252/256 */
1322 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1323 AB8500_LED_INDICATOR_PWM_DUTY,
1324 LED_INDICATOR_PWM_DUTY_252_256);
1325 if (ret) {
1326 dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1327 return ret;
1328 }
1329 } else {
1330 /* Power off charging LED indicator */
1331 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1332 AB8500_LED_INDICATOR_PWM_CTRL,
1333 LED_INDICATOR_PWM_DIS);
1334 if (ret) {
1335 dev_err(di->dev, "Power-off LED failed\n");
1336 return ret;
1337 }
1338 }
1339
1340 return ret;
1341 }
1342
1343 /**
1344 * ab8500_charger_ac_en() - enable or disable ac charging
1345 * @di: pointer to the ab8500_charger structure
1346 * @enable: enable/disable flag
1347 * @vset: charging voltage
1348 * @iset: charging current
1349 *
1350 * Enable/Disable AC/Mains charging and turns on/off the charging led
1351 * respectively.
1352 **/
ab8500_charger_ac_en(struct ux500_charger * charger,int enable,int vset,int iset)1353 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1354 int enable, int vset, int iset)
1355 {
1356 int ret;
1357 int volt_index;
1358 int curr_index;
1359 int input_curr_index;
1360 u8 overshoot = 0;
1361
1362 struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1363
1364 if (enable) {
1365 /* Check if AC is connected */
1366 if (!di->ac.charger_connected) {
1367 dev_err(di->dev, "AC charger not connected\n");
1368 return -ENXIO;
1369 }
1370
1371 /* Enable AC charging */
1372 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1373
1374 /*
1375 * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1376 * will be triggered everytime we enable the VDD ADC supply.
1377 * This will turn off charging for a short while.
1378 * It can be avoided by having the supply on when
1379 * there is a charger enabled. Normally the VDD ADC supply
1380 * is enabled everytime a GPADC conversion is triggered. We will
1381 * force it to be enabled from this driver to have
1382 * the GPADC module independant of the AB8500 chargers
1383 */
1384 if (!di->vddadc_en_ac) {
1385 ret = regulator_enable(di->regu);
1386 if (ret)
1387 dev_warn(di->dev,
1388 "Failed to enable regulator\n");
1389 else
1390 di->vddadc_en_ac = true;
1391 }
1392
1393 /* Check if the requested voltage or current is valid */
1394 volt_index = ab8500_voltage_to_regval(vset);
1395 curr_index = ab8500_current_to_regval(di, iset);
1396 input_curr_index = ab8500_current_to_regval(di,
1397 di->bm->chg_params->ac_curr_max);
1398 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1399 dev_err(di->dev,
1400 "Charger voltage or current too high, "
1401 "charging not started\n");
1402 return -ENXIO;
1403 }
1404
1405 /* ChVoltLevel: maximum battery charging voltage */
1406 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1407 AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1408 if (ret) {
1409 dev_err(di->dev, "%s write failed\n", __func__);
1410 return ret;
1411 }
1412 /* MainChInputCurr: current that can be drawn from the charger*/
1413 ret = ab8500_charger_set_main_in_curr(di,
1414 di->bm->chg_params->ac_curr_max);
1415 if (ret) {
1416 dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1417 __func__);
1418 return ret;
1419 }
1420 /* ChOutputCurentLevel: protected output current */
1421 ret = ab8500_charger_set_output_curr(di, iset);
1422 if (ret) {
1423 dev_err(di->dev, "%s "
1424 "Failed to set ChOutputCurentLevel\n",
1425 __func__);
1426 return ret;
1427 }
1428
1429 /* Check if VBAT overshoot control should be enabled */
1430 if (!di->bm->enable_overshoot)
1431 overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1432
1433 /* Enable Main Charger */
1434 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1435 AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1436 if (ret) {
1437 dev_err(di->dev, "%s write failed\n", __func__);
1438 return ret;
1439 }
1440
1441 /* Power on charging LED indication */
1442 ret = ab8500_charger_led_en(di, true);
1443 if (ret < 0)
1444 dev_err(di->dev, "failed to enable LED\n");
1445
1446 di->ac.charger_online = 1;
1447 } else {
1448 /* Disable AC charging */
1449 if (is_ab8500_1p1_or_earlier(di->parent)) {
1450 /*
1451 * For ABB revision 1.0 and 1.1 there is a bug in the
1452 * watchdog logic. That means we have to continously
1453 * kick the charger watchdog even when no charger is
1454 * connected. This is only valid once the AC charger
1455 * has been enabled. This is a bug that is not handled
1456 * by the algorithm and the watchdog have to be kicked
1457 * by the charger driver when the AC charger
1458 * is disabled
1459 */
1460 if (di->ac_conn) {
1461 queue_delayed_work(di->charger_wq,
1462 &di->kick_wd_work,
1463 round_jiffies(WD_KICK_INTERVAL));
1464 }
1465
1466 /*
1467 * We can't turn off charging completely
1468 * due to a bug in AB8500 cut1.
1469 * If we do, charging will not start again.
1470 * That is why we set the lowest voltage
1471 * and current possible
1472 */
1473 ret = abx500_set_register_interruptible(di->dev,
1474 AB8500_CHARGER,
1475 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1476 if (ret) {
1477 dev_err(di->dev,
1478 "%s write failed\n", __func__);
1479 return ret;
1480 }
1481
1482 ret = ab8500_charger_set_output_curr(di, 0);
1483 if (ret) {
1484 dev_err(di->dev, "%s "
1485 "Failed to set ChOutputCurentLevel\n",
1486 __func__);
1487 return ret;
1488 }
1489 } else {
1490 ret = abx500_set_register_interruptible(di->dev,
1491 AB8500_CHARGER,
1492 AB8500_MCH_CTRL1, 0);
1493 if (ret) {
1494 dev_err(di->dev,
1495 "%s write failed\n", __func__);
1496 return ret;
1497 }
1498 }
1499
1500 ret = ab8500_charger_led_en(di, false);
1501 if (ret < 0)
1502 dev_err(di->dev, "failed to disable LED\n");
1503
1504 di->ac.charger_online = 0;
1505 di->ac.wd_expired = false;
1506
1507 /* Disable regulator if enabled */
1508 if (di->vddadc_en_ac) {
1509 regulator_disable(di->regu);
1510 di->vddadc_en_ac = false;
1511 }
1512
1513 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1514 }
1515 ab8500_power_supply_changed(di, di->ac_chg.psy);
1516
1517 return ret;
1518 }
1519
1520 /**
1521 * ab8500_charger_usb_en() - enable usb charging
1522 * @di: pointer to the ab8500_charger structure
1523 * @enable: enable/disable flag
1524 * @vset: charging voltage
1525 * @ich_out: charger output current
1526 *
1527 * Enable/Disable USB charging and turns on/off the charging led respectively.
1528 * Returns error code in case of failure else 0(on success)
1529 */
ab8500_charger_usb_en(struct ux500_charger * charger,int enable,int vset,int ich_out)1530 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1531 int enable, int vset, int ich_out)
1532 {
1533 int ret;
1534 int volt_index;
1535 int curr_index;
1536 u8 overshoot = 0;
1537
1538 struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1539
1540 if (enable) {
1541 /* Check if USB is connected */
1542 if (!di->usb.charger_connected) {
1543 dev_err(di->dev, "USB charger not connected\n");
1544 return -ENXIO;
1545 }
1546
1547 /*
1548 * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1549 * will be triggered everytime we enable the VDD ADC supply.
1550 * This will turn off charging for a short while.
1551 * It can be avoided by having the supply on when
1552 * there is a charger enabled. Normally the VDD ADC supply
1553 * is enabled everytime a GPADC conversion is triggered. We will
1554 * force it to be enabled from this driver to have
1555 * the GPADC module independant of the AB8500 chargers
1556 */
1557 if (!di->vddadc_en_usb) {
1558 ret = regulator_enable(di->regu);
1559 if (ret)
1560 dev_warn(di->dev,
1561 "Failed to enable regulator\n");
1562 else
1563 di->vddadc_en_usb = true;
1564 }
1565
1566 /* Enable USB charging */
1567 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1568
1569 /* Check if the requested voltage or current is valid */
1570 volt_index = ab8500_voltage_to_regval(vset);
1571 curr_index = ab8500_current_to_regval(di, ich_out);
1572 if (volt_index < 0 || curr_index < 0) {
1573 dev_err(di->dev,
1574 "Charger voltage or current too high, "
1575 "charging not started\n");
1576 return -ENXIO;
1577 }
1578
1579 /* ChVoltLevel: max voltage upto which battery can be charged */
1580 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1581 AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1582 if (ret) {
1583 dev_err(di->dev, "%s write failed\n", __func__);
1584 return ret;
1585 }
1586 /* Check if VBAT overshoot control should be enabled */
1587 if (!di->bm->enable_overshoot)
1588 overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1589
1590 /* Enable USB Charger */
1591 dev_dbg(di->dev,
1592 "Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1593 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1594 AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1595 if (ret) {
1596 dev_err(di->dev, "%s write failed\n", __func__);
1597 return ret;
1598 }
1599
1600 /* If success power on charging LED indication */
1601 ret = ab8500_charger_led_en(di, true);
1602 if (ret < 0)
1603 dev_err(di->dev, "failed to enable LED\n");
1604
1605 di->usb.charger_online = 1;
1606
1607 /* USBChInputCurr: current that can be drawn from the usb */
1608 ret = ab8500_charger_set_vbus_in_curr(di,
1609 di->max_usb_in_curr.usb_type_max);
1610 if (ret) {
1611 dev_err(di->dev, "setting USBChInputCurr failed\n");
1612 return ret;
1613 }
1614
1615 /* ChOutputCurentLevel: protected output current */
1616 ret = ab8500_charger_set_output_curr(di, ich_out);
1617 if (ret) {
1618 dev_err(di->dev, "%s "
1619 "Failed to set ChOutputCurentLevel\n",
1620 __func__);
1621 return ret;
1622 }
1623
1624 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1625
1626 } else {
1627 /* Disable USB charging */
1628 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1629 ret = abx500_set_register_interruptible(di->dev,
1630 AB8500_CHARGER,
1631 AB8500_USBCH_CTRL1_REG, 0);
1632 if (ret) {
1633 dev_err(di->dev,
1634 "%s write failed\n", __func__);
1635 return ret;
1636 }
1637
1638 ret = ab8500_charger_led_en(di, false);
1639 if (ret < 0)
1640 dev_err(di->dev, "failed to disable LED\n");
1641 /* USBChInputCurr: current that can be drawn from the usb */
1642 ret = ab8500_charger_set_vbus_in_curr(di, 0);
1643 if (ret) {
1644 dev_err(di->dev, "setting USBChInputCurr failed\n");
1645 return ret;
1646 }
1647
1648 /* ChOutputCurentLevel: protected output current */
1649 ret = ab8500_charger_set_output_curr(di, 0);
1650 if (ret) {
1651 dev_err(di->dev, "%s "
1652 "Failed to reset ChOutputCurentLevel\n",
1653 __func__);
1654 return ret;
1655 }
1656 di->usb.charger_online = 0;
1657 di->usb.wd_expired = false;
1658
1659 /* Disable regulator if enabled */
1660 if (di->vddadc_en_usb) {
1661 regulator_disable(di->regu);
1662 di->vddadc_en_usb = false;
1663 }
1664
1665 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1666
1667 /* Cancel any pending Vbat check work */
1668 cancel_delayed_work(&di->check_vbat_work);
1669
1670 }
1671 ab8500_power_supply_changed(di, di->usb_chg.psy);
1672
1673 return ret;
1674 }
1675
ab8500_external_charger_prepare(struct notifier_block * charger_nb,unsigned long event,void * data)1676 static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
1677 unsigned long event, void *data)
1678 {
1679 int ret;
1680 struct device *dev = data;
1681 /*Toggle External charger control pin*/
1682 ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1683 AB8500_SYS_CHARGER_CONTROL_REG,
1684 EXTERNAL_CHARGER_DISABLE_REG_VAL);
1685 if (ret < 0) {
1686 dev_err(dev, "write reg failed %d\n", ret);
1687 goto out;
1688 }
1689 ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1690 AB8500_SYS_CHARGER_CONTROL_REG,
1691 EXTERNAL_CHARGER_ENABLE_REG_VAL);
1692 if (ret < 0)
1693 dev_err(dev, "Write reg failed %d\n", ret);
1694
1695 out:
1696 return ret;
1697 }
1698
1699 /**
1700 * ab8500_charger_usb_check_enable() - enable usb charging
1701 * @charger: pointer to the ux500_charger structure
1702 * @vset: charging voltage
1703 * @iset: charger output current
1704 *
1705 * Check if the VBUS charger has been disconnected and reconnected without
1706 * AB8500 rising an interrupt. Returns 0 on success.
1707 */
ab8500_charger_usb_check_enable(struct ux500_charger * charger,int vset,int iset)1708 static int ab8500_charger_usb_check_enable(struct ux500_charger *charger,
1709 int vset, int iset)
1710 {
1711 u8 usbch_ctrl1 = 0;
1712 int ret = 0;
1713
1714 struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1715
1716 if (!di->usb.charger_connected)
1717 return ret;
1718
1719 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1720 AB8500_USBCH_CTRL1_REG, &usbch_ctrl1);
1721 if (ret < 0) {
1722 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1723 return ret;
1724 }
1725 dev_dbg(di->dev, "USB charger ctrl: 0x%02x\n", usbch_ctrl1);
1726
1727 if (!(usbch_ctrl1 & USB_CH_ENA)) {
1728 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1729
1730 ret = abx500_mask_and_set_register_interruptible(di->dev,
1731 AB8500_CHARGER, AB8500_CHARGER_CTRL,
1732 DROP_COUNT_RESET, DROP_COUNT_RESET);
1733 if (ret < 0) {
1734 dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1735 return ret;
1736 }
1737
1738 ret = ab8500_charger_usb_en(&di->usb_chg, true, vset, iset);
1739 if (ret < 0) {
1740 dev_err(di->dev, "Failed to enable VBUS charger %d\n",
1741 __LINE__);
1742 return ret;
1743 }
1744 }
1745 return ret;
1746 }
1747
1748 /**
1749 * ab8500_charger_ac_check_enable() - enable usb charging
1750 * @charger: pointer to the ux500_charger structure
1751 * @vset: charging voltage
1752 * @iset: charger output current
1753 *
1754 * Check if the AC charger has been disconnected and reconnected without
1755 * AB8500 rising an interrupt. Returns 0 on success.
1756 */
ab8500_charger_ac_check_enable(struct ux500_charger * charger,int vset,int iset)1757 static int ab8500_charger_ac_check_enable(struct ux500_charger *charger,
1758 int vset, int iset)
1759 {
1760 u8 mainch_ctrl1 = 0;
1761 int ret = 0;
1762
1763 struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1764
1765 if (!di->ac.charger_connected)
1766 return ret;
1767
1768 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1769 AB8500_MCH_CTRL1, &mainch_ctrl1);
1770 if (ret < 0) {
1771 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1772 return ret;
1773 }
1774 dev_dbg(di->dev, "AC charger ctrl: 0x%02x\n", mainch_ctrl1);
1775
1776 if (!(mainch_ctrl1 & MAIN_CH_ENA)) {
1777 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1778
1779 ret = abx500_mask_and_set_register_interruptible(di->dev,
1780 AB8500_CHARGER, AB8500_CHARGER_CTRL,
1781 DROP_COUNT_RESET, DROP_COUNT_RESET);
1782
1783 if (ret < 0) {
1784 dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1785 return ret;
1786 }
1787
1788 ret = ab8500_charger_ac_en(&di->usb_chg, true, vset, iset);
1789 if (ret < 0) {
1790 dev_err(di->dev, "failed to enable AC charger %d\n",
1791 __LINE__);
1792 return ret;
1793 }
1794 }
1795 return ret;
1796 }
1797
1798 /**
1799 * ab8500_charger_watchdog_kick() - kick charger watchdog
1800 * @di: pointer to the ab8500_charger structure
1801 *
1802 * Kick charger watchdog
1803 * Returns error code in case of failure else 0(on success)
1804 */
ab8500_charger_watchdog_kick(struct ux500_charger * charger)1805 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1806 {
1807 int ret;
1808 struct ab8500_charger *di;
1809
1810 if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1811 di = to_ab8500_charger_ac_device_info(charger);
1812 else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1813 di = to_ab8500_charger_usb_device_info(charger);
1814 else
1815 return -ENXIO;
1816
1817 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1818 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1819 if (ret)
1820 dev_err(di->dev, "Failed to kick WD!\n");
1821
1822 return ret;
1823 }
1824
1825 /**
1826 * ab8500_charger_update_charger_current() - update charger current
1827 * @di: pointer to the ab8500_charger structure
1828 *
1829 * Update the charger output current for the specified charger
1830 * Returns error code in case of failure else 0(on success)
1831 */
ab8500_charger_update_charger_current(struct ux500_charger * charger,int ich_out)1832 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1833 int ich_out)
1834 {
1835 int ret;
1836 struct ab8500_charger *di;
1837
1838 if (charger->psy->desc->type == POWER_SUPPLY_TYPE_MAINS)
1839 di = to_ab8500_charger_ac_device_info(charger);
1840 else if (charger->psy->desc->type == POWER_SUPPLY_TYPE_USB)
1841 di = to_ab8500_charger_usb_device_info(charger);
1842 else
1843 return -ENXIO;
1844
1845 ret = ab8500_charger_set_output_curr(di, ich_out);
1846 if (ret) {
1847 dev_err(di->dev, "%s "
1848 "Failed to set ChOutputCurentLevel\n",
1849 __func__);
1850 return ret;
1851 }
1852
1853 /* Reset the main and usb drop input current measurement counter */
1854 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1855 AB8500_CHARGER_CTRL, DROP_COUNT_RESET);
1856 if (ret) {
1857 dev_err(di->dev, "%s write failed\n", __func__);
1858 return ret;
1859 }
1860
1861 return ret;
1862 }
1863
ab8500_charger_get_ext_psy_data(struct device * dev,void * data)1864 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1865 {
1866 struct power_supply *psy;
1867 struct power_supply *ext = dev_get_drvdata(dev);
1868 const char **supplicants = (const char **)ext->supplied_to;
1869 struct ab8500_charger *di;
1870 union power_supply_propval ret;
1871 int j;
1872 struct ux500_charger *usb_chg;
1873
1874 usb_chg = (struct ux500_charger *)data;
1875 psy = usb_chg->psy;
1876
1877 di = to_ab8500_charger_usb_device_info(usb_chg);
1878
1879 /* For all psy where the driver name appears in any supplied_to */
1880 j = match_string(supplicants, ext->num_supplicants, psy->desc->name);
1881 if (j < 0)
1882 return 0;
1883
1884 /* Go through all properties for the psy */
1885 for (j = 0; j < ext->desc->num_properties; j++) {
1886 enum power_supply_property prop;
1887 prop = ext->desc->properties[j];
1888
1889 if (power_supply_get_property(ext, prop, &ret))
1890 continue;
1891
1892 switch (prop) {
1893 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1894 switch (ext->desc->type) {
1895 case POWER_SUPPLY_TYPE_BATTERY:
1896 di->vbat = ret.intval / 1000;
1897 break;
1898 default:
1899 break;
1900 }
1901 break;
1902 default:
1903 break;
1904 }
1905 }
1906 return 0;
1907 }
1908
1909 /**
1910 * ab8500_charger_check_vbat_work() - keep vbus current within spec
1911 * @work pointer to the work_struct structure
1912 *
1913 * Due to a asic bug it is necessary to lower the input current to the vbus
1914 * charger when charging with at some specific levels. This issue is only valid
1915 * for below a certain battery voltage. This function makes sure that the
1916 * the allowed current limit isn't exceeded.
1917 */
ab8500_charger_check_vbat_work(struct work_struct * work)1918 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1919 {
1920 int t = 10;
1921 struct ab8500_charger *di = container_of(work,
1922 struct ab8500_charger, check_vbat_work.work);
1923
1924 class_for_each_device(power_supply_class, NULL,
1925 di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1926
1927 /* First run old_vbat is 0. */
1928 if (di->old_vbat == 0)
1929 di->old_vbat = di->vbat;
1930
1931 if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
1932 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
1933 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
1934 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
1935
1936 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
1937 " old: %d\n", di->max_usb_in_curr.usb_type_max,
1938 di->vbat, di->old_vbat);
1939 ab8500_charger_set_vbus_in_curr(di,
1940 di->max_usb_in_curr.usb_type_max);
1941 power_supply_changed(di->usb_chg.psy);
1942 }
1943
1944 di->old_vbat = di->vbat;
1945
1946 /*
1947 * No need to check the battery voltage every second when not close to
1948 * the threshold.
1949 */
1950 if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
1951 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
1952 t = 1;
1953
1954 queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
1955 }
1956
1957 /**
1958 * ab8500_charger_check_hw_failure_work() - check main charger failure
1959 * @work: pointer to the work_struct structure
1960 *
1961 * Work queue function for checking the main charger status
1962 */
ab8500_charger_check_hw_failure_work(struct work_struct * work)1963 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
1964 {
1965 int ret;
1966 u8 reg_value;
1967
1968 struct ab8500_charger *di = container_of(work,
1969 struct ab8500_charger, check_hw_failure_work.work);
1970
1971 /* Check if the status bits for HW failure is still active */
1972 if (di->flags.mainextchnotok) {
1973 ret = abx500_get_register_interruptible(di->dev,
1974 AB8500_CHARGER, AB8500_CH_STATUS2_REG, ®_value);
1975 if (ret < 0) {
1976 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1977 return;
1978 }
1979 if (!(reg_value & MAIN_CH_NOK)) {
1980 di->flags.mainextchnotok = false;
1981 ab8500_power_supply_changed(di, di->ac_chg.psy);
1982 }
1983 }
1984 if (di->flags.vbus_ovv) {
1985 ret = abx500_get_register_interruptible(di->dev,
1986 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
1987 ®_value);
1988 if (ret < 0) {
1989 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1990 return;
1991 }
1992 if (!(reg_value & VBUS_OVV_TH)) {
1993 di->flags.vbus_ovv = false;
1994 ab8500_power_supply_changed(di, di->usb_chg.psy);
1995 }
1996 }
1997 /* If we still have a failure, schedule a new check */
1998 if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
1999 queue_delayed_work(di->charger_wq,
2000 &di->check_hw_failure_work, round_jiffies(HZ));
2001 }
2002 }
2003
2004 /**
2005 * ab8500_charger_kick_watchdog_work() - kick the watchdog
2006 * @work: pointer to the work_struct structure
2007 *
2008 * Work queue function for kicking the charger watchdog.
2009 *
2010 * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2011 * logic. That means we have to continously kick the charger
2012 * watchdog even when no charger is connected. This is only
2013 * valid once the AC charger has been enabled. This is
2014 * a bug that is not handled by the algorithm and the
2015 * watchdog have to be kicked by the charger driver
2016 * when the AC charger is disabled
2017 */
ab8500_charger_kick_watchdog_work(struct work_struct * work)2018 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
2019 {
2020 int ret;
2021
2022 struct ab8500_charger *di = container_of(work,
2023 struct ab8500_charger, kick_wd_work.work);
2024
2025 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2026 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2027 if (ret)
2028 dev_err(di->dev, "Failed to kick WD!\n");
2029
2030 /* Schedule a new watchdog kick */
2031 queue_delayed_work(di->charger_wq,
2032 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
2033 }
2034
2035 /**
2036 * ab8500_charger_ac_work() - work to get and set main charger status
2037 * @work: pointer to the work_struct structure
2038 *
2039 * Work queue function for checking the main charger status
2040 */
ab8500_charger_ac_work(struct work_struct * work)2041 static void ab8500_charger_ac_work(struct work_struct *work)
2042 {
2043 int ret;
2044
2045 struct ab8500_charger *di = container_of(work,
2046 struct ab8500_charger, ac_work);
2047
2048 /*
2049 * Since we can't be sure that the events are received
2050 * synchronously, we have the check if the main charger is
2051 * connected by reading the status register
2052 */
2053 ret = ab8500_charger_detect_chargers(di, false);
2054 if (ret < 0)
2055 return;
2056
2057 if (ret & AC_PW_CONN) {
2058 di->ac.charger_connected = 1;
2059 di->ac_conn = true;
2060 } else {
2061 di->ac.charger_connected = 0;
2062 }
2063
2064 ab8500_power_supply_changed(di, di->ac_chg.psy);
2065 sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
2066 }
2067
ab8500_charger_usb_attached_work(struct work_struct * work)2068 static void ab8500_charger_usb_attached_work(struct work_struct *work)
2069 {
2070 struct ab8500_charger *di = container_of(work,
2071 struct ab8500_charger,
2072 usb_charger_attached_work.work);
2073 int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
2074 int ret, i;
2075 u8 statval;
2076
2077 for (i = 0; i < 10; i++) {
2078 ret = abx500_get_register_interruptible(di->dev,
2079 AB8500_CHARGER,
2080 AB8500_CH_USBCH_STAT1_REG,
2081 &statval);
2082 if (ret < 0) {
2083 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2084 goto reschedule;
2085 }
2086 if ((statval & usbch) != usbch)
2087 goto reschedule;
2088
2089 msleep(CHARGER_STATUS_POLL);
2090 }
2091
2092 ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
2093
2094 mutex_lock(&di->charger_attached_mutex);
2095 mutex_unlock(&di->charger_attached_mutex);
2096
2097 return;
2098
2099 reschedule:
2100 queue_delayed_work(di->charger_wq,
2101 &di->usb_charger_attached_work,
2102 HZ);
2103 }
2104
ab8500_charger_ac_attached_work(struct work_struct * work)2105 static void ab8500_charger_ac_attached_work(struct work_struct *work)
2106 {
2107
2108 struct ab8500_charger *di = container_of(work,
2109 struct ab8500_charger,
2110 ac_charger_attached_work.work);
2111 int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2112 MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2113 int ret, i;
2114 u8 statval;
2115
2116 for (i = 0; i < 10; i++) {
2117 ret = abx500_get_register_interruptible(di->dev,
2118 AB8500_CHARGER,
2119 AB8500_CH_STATUS2_REG,
2120 &statval);
2121 if (ret < 0) {
2122 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2123 goto reschedule;
2124 }
2125
2126 if ((statval & mainch) != mainch)
2127 goto reschedule;
2128
2129 msleep(CHARGER_STATUS_POLL);
2130 }
2131
2132 ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2133 queue_work(di->charger_wq, &di->ac_work);
2134
2135 mutex_lock(&di->charger_attached_mutex);
2136 mutex_unlock(&di->charger_attached_mutex);
2137
2138 return;
2139
2140 reschedule:
2141 queue_delayed_work(di->charger_wq,
2142 &di->ac_charger_attached_work,
2143 HZ);
2144 }
2145
2146 /**
2147 * ab8500_charger_detect_usb_type_work() - work to detect USB type
2148 * @work: Pointer to the work_struct structure
2149 *
2150 * Detect the type of USB plugged
2151 */
ab8500_charger_detect_usb_type_work(struct work_struct * work)2152 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2153 {
2154 int ret;
2155
2156 struct ab8500_charger *di = container_of(work,
2157 struct ab8500_charger, detect_usb_type_work);
2158
2159 /*
2160 * Since we can't be sure that the events are received
2161 * synchronously, we have the check if is
2162 * connected by reading the status register
2163 */
2164 ret = ab8500_charger_detect_chargers(di, false);
2165 if (ret < 0)
2166 return;
2167
2168 if (!(ret & USB_PW_CONN)) {
2169 dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2170 di->vbus_detected = false;
2171 ab8500_charger_set_usb_connected(di, false);
2172 ab8500_power_supply_changed(di, di->usb_chg.psy);
2173 } else {
2174 dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2175 di->vbus_detected = true;
2176
2177 if (is_ab8500_1p1_or_earlier(di->parent)) {
2178 ret = ab8500_charger_detect_usb_type(di);
2179 if (!ret) {
2180 ab8500_charger_set_usb_connected(di, true);
2181 ab8500_power_supply_changed(di,
2182 di->usb_chg.psy);
2183 }
2184 } else {
2185 /*
2186 * For ABB cut2.0 and onwards we have an IRQ,
2187 * USB_LINK_STATUS that will be triggered when the USB
2188 * link status changes. The exception is USB connected
2189 * during startup. Then we don't get a
2190 * USB_LINK_STATUS IRQ
2191 */
2192 if (di->vbus_detected_start) {
2193 di->vbus_detected_start = false;
2194 ret = ab8500_charger_detect_usb_type(di);
2195 if (!ret) {
2196 ab8500_charger_set_usb_connected(di,
2197 true);
2198 ab8500_power_supply_changed(di,
2199 di->usb_chg.psy);
2200 }
2201 }
2202 }
2203 }
2204 }
2205
2206 /**
2207 * ab8500_charger_usb_link_attach_work() - work to detect USB type
2208 * @work: pointer to the work_struct structure
2209 *
2210 * Detect the type of USB plugged
2211 */
ab8500_charger_usb_link_attach_work(struct work_struct * work)2212 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2213 {
2214 struct ab8500_charger *di =
2215 container_of(work, struct ab8500_charger, attach_work.work);
2216 int ret;
2217
2218 /* Update maximum input current if USB enumeration is not detected */
2219 if (!di->usb.charger_online) {
2220 ret = ab8500_charger_set_vbus_in_curr(di,
2221 di->max_usb_in_curr.usb_type_max);
2222 if (ret)
2223 return;
2224 }
2225
2226 ab8500_charger_set_usb_connected(di, true);
2227 ab8500_power_supply_changed(di, di->usb_chg.psy);
2228 }
2229
2230 /**
2231 * ab8500_charger_usb_link_status_work() - work to detect USB type
2232 * @work: pointer to the work_struct structure
2233 *
2234 * Detect the type of USB plugged
2235 */
ab8500_charger_usb_link_status_work(struct work_struct * work)2236 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2237 {
2238 int detected_chargers;
2239 int ret;
2240 u8 val;
2241 u8 link_status;
2242
2243 struct ab8500_charger *di = container_of(work,
2244 struct ab8500_charger, usb_link_status_work);
2245
2246 /*
2247 * Since we can't be sure that the events are received
2248 * synchronously, we have the check if is
2249 * connected by reading the status register
2250 */
2251 detected_chargers = ab8500_charger_detect_chargers(di, false);
2252 if (detected_chargers < 0)
2253 return;
2254
2255 /*
2256 * Some chargers that breaks the USB spec is
2257 * identified as invalid by AB8500 and it refuse
2258 * to start the charging process. but by jumping
2259 * thru a few hoops it can be forced to start.
2260 */
2261 if (is_ab8500(di->parent))
2262 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2263 AB8500_USB_LINE_STAT_REG, &val);
2264 else
2265 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2266 AB8500_USB_LINK1_STAT_REG, &val);
2267
2268 if (ret >= 0)
2269 dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2270 else
2271 dev_dbg(di->dev, "Error reading USB link status\n");
2272
2273 if (is_ab8500(di->parent))
2274 link_status = AB8500_USB_LINK_STATUS;
2275 else
2276 link_status = AB8505_USB_LINK_STATUS;
2277
2278 if (detected_chargers & USB_PW_CONN) {
2279 if (((val & link_status) >> USB_LINK_STATUS_SHIFT) ==
2280 USB_STAT_NOT_VALID_LINK &&
2281 di->invalid_charger_detect_state == 0) {
2282 dev_dbg(di->dev,
2283 "Invalid charger detected, state= 0\n");
2284 /*Enable charger*/
2285 abx500_mask_and_set_register_interruptible(di->dev,
2286 AB8500_CHARGER, AB8500_USBCH_CTRL1_REG,
2287 USB_CH_ENA, USB_CH_ENA);
2288 /*Enable charger detection*/
2289 abx500_mask_and_set_register_interruptible(di->dev,
2290 AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2291 USB_CH_DET, USB_CH_DET);
2292 di->invalid_charger_detect_state = 1;
2293 /*exit and wait for new link status interrupt.*/
2294 return;
2295
2296 }
2297 if (di->invalid_charger_detect_state == 1) {
2298 dev_dbg(di->dev,
2299 "Invalid charger detected, state= 1\n");
2300 /*Stop charger detection*/
2301 abx500_mask_and_set_register_interruptible(di->dev,
2302 AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2303 USB_CH_DET, 0x00);
2304 /*Check link status*/
2305 if (is_ab8500(di->parent))
2306 ret = abx500_get_register_interruptible(di->dev,
2307 AB8500_USB, AB8500_USB_LINE_STAT_REG,
2308 &val);
2309 else
2310 ret = abx500_get_register_interruptible(di->dev,
2311 AB8500_USB, AB8500_USB_LINK1_STAT_REG,
2312 &val);
2313
2314 dev_dbg(di->dev, "USB link status= 0x%02x\n",
2315 (val & link_status) >> USB_LINK_STATUS_SHIFT);
2316 di->invalid_charger_detect_state = 2;
2317 }
2318 } else {
2319 di->invalid_charger_detect_state = 0;
2320 }
2321
2322 if (!(detected_chargers & USB_PW_CONN)) {
2323 di->vbus_detected = false;
2324 ab8500_charger_set_usb_connected(di, false);
2325 ab8500_power_supply_changed(di, di->usb_chg.psy);
2326 return;
2327 }
2328
2329 dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2330 di->vbus_detected = true;
2331 ret = ab8500_charger_read_usb_type(di);
2332 if (ret) {
2333 if (ret == -ENXIO) {
2334 /* No valid charger type detected */
2335 ab8500_charger_set_usb_connected(di, false);
2336 ab8500_power_supply_changed(di, di->usb_chg.psy);
2337 }
2338 return;
2339 }
2340
2341 if (di->usb_device_is_unrecognised) {
2342 dev_dbg(di->dev,
2343 "Potential Legacy Charger device. "
2344 "Delay work for %d msec for USB enum "
2345 "to finish",
2346 WAIT_ACA_RID_ENUMERATION);
2347 queue_delayed_work(di->charger_wq,
2348 &di->attach_work,
2349 msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2350 } else if (di->is_aca_rid == 1) {
2351 /* Only wait once */
2352 di->is_aca_rid++;
2353 dev_dbg(di->dev,
2354 "%s Wait %d msec for USB enum to finish",
2355 __func__, WAIT_ACA_RID_ENUMERATION);
2356 queue_delayed_work(di->charger_wq,
2357 &di->attach_work,
2358 msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2359 } else {
2360 queue_delayed_work(di->charger_wq,
2361 &di->attach_work,
2362 0);
2363 }
2364 }
2365
ab8500_charger_usb_state_changed_work(struct work_struct * work)2366 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2367 {
2368 int ret;
2369 unsigned long flags;
2370
2371 struct ab8500_charger *di = container_of(work,
2372 struct ab8500_charger, usb_state_changed_work.work);
2373
2374 if (!di->vbus_detected) {
2375 dev_dbg(di->dev,
2376 "%s !di->vbus_detected\n",
2377 __func__);
2378 return;
2379 }
2380
2381 spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2382 di->usb_state.state = di->usb_state.state_tmp;
2383 di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2384 spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2385
2386 dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2387 __func__, di->usb_state.state, di->usb_state.usb_current);
2388
2389 switch (di->usb_state.state) {
2390 case AB8500_BM_USB_STATE_RESET_HS:
2391 case AB8500_BM_USB_STATE_RESET_FS:
2392 case AB8500_BM_USB_STATE_SUSPEND:
2393 case AB8500_BM_USB_STATE_MAX:
2394 ab8500_charger_set_usb_connected(di, false);
2395 ab8500_power_supply_changed(di, di->usb_chg.psy);
2396 break;
2397
2398 case AB8500_BM_USB_STATE_RESUME:
2399 /*
2400 * when suspend->resume there should be delay
2401 * of 1sec for enabling charging
2402 */
2403 msleep(1000);
2404 /* Intentional fall through */
2405 case AB8500_BM_USB_STATE_CONFIGURED:
2406 /*
2407 * USB is configured, enable charging with the charging
2408 * input current obtained from USB driver
2409 */
2410 if (!ab8500_charger_get_usb_cur(di)) {
2411 /* Update maximum input current */
2412 ret = ab8500_charger_set_vbus_in_curr(di,
2413 di->max_usb_in_curr.usb_type_max);
2414 if (ret)
2415 return;
2416
2417 ab8500_charger_set_usb_connected(di, true);
2418 ab8500_power_supply_changed(di, di->usb_chg.psy);
2419 }
2420 break;
2421
2422 default:
2423 break;
2424 };
2425 }
2426
2427 /**
2428 * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2429 * @work: pointer to the work_struct structure
2430 *
2431 * Work queue function for checking the USB charger Not OK status
2432 */
ab8500_charger_check_usbchargernotok_work(struct work_struct * work)2433 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2434 {
2435 int ret;
2436 u8 reg_value;
2437 bool prev_status;
2438
2439 struct ab8500_charger *di = container_of(work,
2440 struct ab8500_charger, check_usbchgnotok_work.work);
2441
2442 /* Check if the status bit for usbchargernotok is still active */
2443 ret = abx500_get_register_interruptible(di->dev,
2444 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, ®_value);
2445 if (ret < 0) {
2446 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2447 return;
2448 }
2449 prev_status = di->flags.usbchargernotok;
2450
2451 if (reg_value & VBUS_CH_NOK) {
2452 di->flags.usbchargernotok = true;
2453 /* Check again in 1sec */
2454 queue_delayed_work(di->charger_wq,
2455 &di->check_usbchgnotok_work, HZ);
2456 } else {
2457 di->flags.usbchargernotok = false;
2458 di->flags.vbus_collapse = false;
2459 }
2460
2461 if (prev_status != di->flags.usbchargernotok)
2462 ab8500_power_supply_changed(di, di->usb_chg.psy);
2463 }
2464
2465 /**
2466 * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2467 * @work: pointer to the work_struct structure
2468 *
2469 * Work queue function for checking the Main thermal prot status
2470 */
ab8500_charger_check_main_thermal_prot_work(struct work_struct * work)2471 static void ab8500_charger_check_main_thermal_prot_work(
2472 struct work_struct *work)
2473 {
2474 int ret;
2475 u8 reg_value;
2476
2477 struct ab8500_charger *di = container_of(work,
2478 struct ab8500_charger, check_main_thermal_prot_work);
2479
2480 /* Check if the status bit for main_thermal_prot is still active */
2481 ret = abx500_get_register_interruptible(di->dev,
2482 AB8500_CHARGER, AB8500_CH_STATUS2_REG, ®_value);
2483 if (ret < 0) {
2484 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2485 return;
2486 }
2487 if (reg_value & MAIN_CH_TH_PROT)
2488 di->flags.main_thermal_prot = true;
2489 else
2490 di->flags.main_thermal_prot = false;
2491
2492 ab8500_power_supply_changed(di, di->ac_chg.psy);
2493 }
2494
2495 /**
2496 * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2497 * @work: pointer to the work_struct structure
2498 *
2499 * Work queue function for checking the USB thermal prot status
2500 */
ab8500_charger_check_usb_thermal_prot_work(struct work_struct * work)2501 static void ab8500_charger_check_usb_thermal_prot_work(
2502 struct work_struct *work)
2503 {
2504 int ret;
2505 u8 reg_value;
2506
2507 struct ab8500_charger *di = container_of(work,
2508 struct ab8500_charger, check_usb_thermal_prot_work);
2509
2510 /* Check if the status bit for usb_thermal_prot is still active */
2511 ret = abx500_get_register_interruptible(di->dev,
2512 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, ®_value);
2513 if (ret < 0) {
2514 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2515 return;
2516 }
2517 if (reg_value & USB_CH_TH_PROT)
2518 di->flags.usb_thermal_prot = true;
2519 else
2520 di->flags.usb_thermal_prot = false;
2521
2522 ab8500_power_supply_changed(di, di->usb_chg.psy);
2523 }
2524
2525 /**
2526 * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2527 * @irq: interrupt number
2528 * @_di: pointer to the ab8500_charger structure
2529 *
2530 * Returns IRQ status(IRQ_HANDLED)
2531 */
ab8500_charger_mainchunplugdet_handler(int irq,void * _di)2532 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2533 {
2534 struct ab8500_charger *di = _di;
2535
2536 dev_dbg(di->dev, "Main charger unplugged\n");
2537 queue_work(di->charger_wq, &di->ac_work);
2538
2539 cancel_delayed_work_sync(&di->ac_charger_attached_work);
2540 mutex_lock(&di->charger_attached_mutex);
2541 mutex_unlock(&di->charger_attached_mutex);
2542
2543 return IRQ_HANDLED;
2544 }
2545
2546 /**
2547 * ab8500_charger_mainchplugdet_handler() - main charger plugged
2548 * @irq: interrupt number
2549 * @_di: pointer to the ab8500_charger structure
2550 *
2551 * Returns IRQ status(IRQ_HANDLED)
2552 */
ab8500_charger_mainchplugdet_handler(int irq,void * _di)2553 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2554 {
2555 struct ab8500_charger *di = _di;
2556
2557 dev_dbg(di->dev, "Main charger plugged\n");
2558 queue_work(di->charger_wq, &di->ac_work);
2559
2560 mutex_lock(&di->charger_attached_mutex);
2561 mutex_unlock(&di->charger_attached_mutex);
2562
2563 if (is_ab8500(di->parent))
2564 queue_delayed_work(di->charger_wq,
2565 &di->ac_charger_attached_work,
2566 HZ);
2567 return IRQ_HANDLED;
2568 }
2569
2570 /**
2571 * ab8500_charger_mainextchnotok_handler() - main charger not ok
2572 * @irq: interrupt number
2573 * @_di: pointer to the ab8500_charger structure
2574 *
2575 * Returns IRQ status(IRQ_HANDLED)
2576 */
ab8500_charger_mainextchnotok_handler(int irq,void * _di)2577 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2578 {
2579 struct ab8500_charger *di = _di;
2580
2581 dev_dbg(di->dev, "Main charger not ok\n");
2582 di->flags.mainextchnotok = true;
2583 ab8500_power_supply_changed(di, di->ac_chg.psy);
2584
2585 /* Schedule a new HW failure check */
2586 queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2587
2588 return IRQ_HANDLED;
2589 }
2590
2591 /**
2592 * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2593 * thermal protection threshold
2594 * @irq: interrupt number
2595 * @_di: pointer to the ab8500_charger structure
2596 *
2597 * Returns IRQ status(IRQ_HANDLED)
2598 */
ab8500_charger_mainchthprotr_handler(int irq,void * _di)2599 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2600 {
2601 struct ab8500_charger *di = _di;
2602
2603 dev_dbg(di->dev,
2604 "Die temp above Main charger thermal protection threshold\n");
2605 queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2606
2607 return IRQ_HANDLED;
2608 }
2609
2610 /**
2611 * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2612 * thermal protection threshold
2613 * @irq: interrupt number
2614 * @_di: pointer to the ab8500_charger structure
2615 *
2616 * Returns IRQ status(IRQ_HANDLED)
2617 */
ab8500_charger_mainchthprotf_handler(int irq,void * _di)2618 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2619 {
2620 struct ab8500_charger *di = _di;
2621
2622 dev_dbg(di->dev,
2623 "Die temp ok for Main charger thermal protection threshold\n");
2624 queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2625
2626 return IRQ_HANDLED;
2627 }
2628
ab8500_charger_vbus_drop_end_work(struct work_struct * work)2629 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2630 {
2631 struct ab8500_charger *di = container_of(work,
2632 struct ab8500_charger, vbus_drop_end_work.work);
2633 int ret, curr;
2634 u8 reg_value;
2635
2636 di->flags.vbus_drop_end = false;
2637
2638 /* Reset the drop counter */
2639 abx500_set_register_interruptible(di->dev,
2640 AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2641
2642 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2643 AB8500_CH_USBCH_STAT2_REG, ®_value);
2644 if (ret < 0) {
2645 dev_err(di->dev, "%s read failed\n", __func__);
2646 return;
2647 }
2648
2649 curr = di->bm->chg_input_curr[
2650 reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
2651
2652 if (di->max_usb_in_curr.calculated_max != curr) {
2653 /* USB source is collapsing */
2654 di->max_usb_in_curr.calculated_max = curr;
2655 dev_dbg(di->dev,
2656 "VBUS input current limiting to %d mA\n",
2657 di->max_usb_in_curr.calculated_max);
2658 } else {
2659 /*
2660 * USB source can not give more than this amount.
2661 * Taking more will collapse the source.
2662 */
2663 di->max_usb_in_curr.set_max =
2664 di->max_usb_in_curr.calculated_max;
2665 dev_dbg(di->dev,
2666 "VBUS input current limited to %d mA\n",
2667 di->max_usb_in_curr.set_max);
2668 }
2669
2670 if (di->usb.charger_connected)
2671 ab8500_charger_set_vbus_in_curr(di,
2672 di->max_usb_in_curr.usb_type_max);
2673 }
2674
2675 /**
2676 * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2677 * @irq: interrupt number
2678 * @_di: pointer to the ab8500_charger structure
2679 *
2680 * Returns IRQ status(IRQ_HANDLED)
2681 */
ab8500_charger_vbusdetf_handler(int irq,void * _di)2682 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2683 {
2684 struct ab8500_charger *di = _di;
2685
2686 di->vbus_detected = false;
2687 dev_dbg(di->dev, "VBUS falling detected\n");
2688 queue_work(di->charger_wq, &di->detect_usb_type_work);
2689
2690 return IRQ_HANDLED;
2691 }
2692
2693 /**
2694 * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2695 * @irq: interrupt number
2696 * @_di: pointer to the ab8500_charger structure
2697 *
2698 * Returns IRQ status(IRQ_HANDLED)
2699 */
ab8500_charger_vbusdetr_handler(int irq,void * _di)2700 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2701 {
2702 struct ab8500_charger *di = _di;
2703
2704 di->vbus_detected = true;
2705 dev_dbg(di->dev, "VBUS rising detected\n");
2706
2707 queue_work(di->charger_wq, &di->detect_usb_type_work);
2708
2709 return IRQ_HANDLED;
2710 }
2711
2712 /**
2713 * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2714 * @irq: interrupt number
2715 * @_di: pointer to the ab8500_charger structure
2716 *
2717 * Returns IRQ status(IRQ_HANDLED)
2718 */
ab8500_charger_usblinkstatus_handler(int irq,void * _di)2719 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2720 {
2721 struct ab8500_charger *di = _di;
2722
2723 dev_dbg(di->dev, "USB link status changed\n");
2724
2725 queue_work(di->charger_wq, &di->usb_link_status_work);
2726
2727 return IRQ_HANDLED;
2728 }
2729
2730 /**
2731 * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2732 * thermal protection threshold
2733 * @irq: interrupt number
2734 * @_di: pointer to the ab8500_charger structure
2735 *
2736 * Returns IRQ status(IRQ_HANDLED)
2737 */
ab8500_charger_usbchthprotr_handler(int irq,void * _di)2738 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2739 {
2740 struct ab8500_charger *di = _di;
2741
2742 dev_dbg(di->dev,
2743 "Die temp above USB charger thermal protection threshold\n");
2744 queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2745
2746 return IRQ_HANDLED;
2747 }
2748
2749 /**
2750 * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2751 * thermal protection threshold
2752 * @irq: interrupt number
2753 * @_di: pointer to the ab8500_charger structure
2754 *
2755 * Returns IRQ status(IRQ_HANDLED)
2756 */
ab8500_charger_usbchthprotf_handler(int irq,void * _di)2757 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2758 {
2759 struct ab8500_charger *di = _di;
2760
2761 dev_dbg(di->dev,
2762 "Die temp ok for USB charger thermal protection threshold\n");
2763 queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2764
2765 return IRQ_HANDLED;
2766 }
2767
2768 /**
2769 * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2770 * @irq: interrupt number
2771 * @_di: pointer to the ab8500_charger structure
2772 *
2773 * Returns IRQ status(IRQ_HANDLED)
2774 */
ab8500_charger_usbchargernotokr_handler(int irq,void * _di)2775 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2776 {
2777 struct ab8500_charger *di = _di;
2778
2779 dev_dbg(di->dev, "Not allowed USB charger detected\n");
2780 queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2781
2782 return IRQ_HANDLED;
2783 }
2784
2785 /**
2786 * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2787 * @irq: interrupt number
2788 * @_di: pointer to the ab8500_charger structure
2789 *
2790 * Returns IRQ status(IRQ_HANDLED)
2791 */
ab8500_charger_chwdexp_handler(int irq,void * _di)2792 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2793 {
2794 struct ab8500_charger *di = _di;
2795
2796 dev_dbg(di->dev, "Charger watchdog expired\n");
2797
2798 /*
2799 * The charger that was online when the watchdog expired
2800 * needs to be restarted for charging to start again
2801 */
2802 if (di->ac.charger_online) {
2803 di->ac.wd_expired = true;
2804 ab8500_power_supply_changed(di, di->ac_chg.psy);
2805 }
2806 if (di->usb.charger_online) {
2807 di->usb.wd_expired = true;
2808 ab8500_power_supply_changed(di, di->usb_chg.psy);
2809 }
2810
2811 return IRQ_HANDLED;
2812 }
2813
2814 /**
2815 * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2816 * @irq: interrupt number
2817 * @_di: pointer to the ab8500_charger structure
2818 *
2819 * Returns IRQ status(IRQ_HANDLED)
2820 */
ab8500_charger_vbuschdropend_handler(int irq,void * _di)2821 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2822 {
2823 struct ab8500_charger *di = _di;
2824
2825 dev_dbg(di->dev, "VBUS charger drop ended\n");
2826 di->flags.vbus_drop_end = true;
2827
2828 /*
2829 * VBUS might have dropped due to bad connection.
2830 * Schedule a new input limit set to the value SW requests.
2831 */
2832 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2833 round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
2834
2835 return IRQ_HANDLED;
2836 }
2837
2838 /**
2839 * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2840 * @irq: interrupt number
2841 * @_di: pointer to the ab8500_charger structure
2842 *
2843 * Returns IRQ status(IRQ_HANDLED)
2844 */
ab8500_charger_vbusovv_handler(int irq,void * _di)2845 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2846 {
2847 struct ab8500_charger *di = _di;
2848
2849 dev_dbg(di->dev, "VBUS overvoltage detected\n");
2850 di->flags.vbus_ovv = true;
2851 ab8500_power_supply_changed(di, di->usb_chg.psy);
2852
2853 /* Schedule a new HW failure check */
2854 queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2855
2856 return IRQ_HANDLED;
2857 }
2858
2859 /**
2860 * ab8500_charger_ac_get_property() - get the ac/mains properties
2861 * @psy: pointer to the power_supply structure
2862 * @psp: pointer to the power_supply_property structure
2863 * @val: pointer to the power_supply_propval union
2864 *
2865 * This function gets called when an application tries to get the ac/mains
2866 * properties by reading the sysfs files.
2867 * AC/Mains properties are online, present and voltage.
2868 * online: ac/mains charging is in progress or not
2869 * present: presence of the ac/mains
2870 * voltage: AC/Mains voltage
2871 * Returns error code in case of failure else 0(on success)
2872 */
ab8500_charger_ac_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)2873 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2874 enum power_supply_property psp,
2875 union power_supply_propval *val)
2876 {
2877 struct ab8500_charger *di;
2878 int ret;
2879
2880 di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2881
2882 switch (psp) {
2883 case POWER_SUPPLY_PROP_HEALTH:
2884 if (di->flags.mainextchnotok)
2885 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2886 else if (di->ac.wd_expired || di->usb.wd_expired)
2887 val->intval = POWER_SUPPLY_HEALTH_DEAD;
2888 else if (di->flags.main_thermal_prot)
2889 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2890 else
2891 val->intval = POWER_SUPPLY_HEALTH_GOOD;
2892 break;
2893 case POWER_SUPPLY_PROP_ONLINE:
2894 val->intval = di->ac.charger_online;
2895 break;
2896 case POWER_SUPPLY_PROP_PRESENT:
2897 val->intval = di->ac.charger_connected;
2898 break;
2899 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2900 ret = ab8500_charger_get_ac_voltage(di);
2901 if (ret >= 0)
2902 di->ac.charger_voltage = ret;
2903 /* On error, use previous value */
2904 val->intval = di->ac.charger_voltage * 1000;
2905 break;
2906 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2907 /*
2908 * This property is used to indicate when CV mode is entered
2909 * for the AC charger
2910 */
2911 di->ac.cv_active = ab8500_charger_ac_cv(di);
2912 val->intval = di->ac.cv_active;
2913 break;
2914 case POWER_SUPPLY_PROP_CURRENT_NOW:
2915 ret = ab8500_charger_get_ac_current(di);
2916 if (ret >= 0)
2917 di->ac.charger_current = ret;
2918 val->intval = di->ac.charger_current * 1000;
2919 break;
2920 default:
2921 return -EINVAL;
2922 }
2923 return 0;
2924 }
2925
2926 /**
2927 * ab8500_charger_usb_get_property() - get the usb properties
2928 * @psy: pointer to the power_supply structure
2929 * @psp: pointer to the power_supply_property structure
2930 * @val: pointer to the power_supply_propval union
2931 *
2932 * This function gets called when an application tries to get the usb
2933 * properties by reading the sysfs files.
2934 * USB properties are online, present and voltage.
2935 * online: usb charging is in progress or not
2936 * present: presence of the usb
2937 * voltage: vbus voltage
2938 * Returns error code in case of failure else 0(on success)
2939 */
ab8500_charger_usb_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)2940 static int ab8500_charger_usb_get_property(struct power_supply *psy,
2941 enum power_supply_property psp,
2942 union power_supply_propval *val)
2943 {
2944 struct ab8500_charger *di;
2945 int ret;
2946
2947 di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
2948
2949 switch (psp) {
2950 case POWER_SUPPLY_PROP_HEALTH:
2951 if (di->flags.usbchargernotok)
2952 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2953 else if (di->ac.wd_expired || di->usb.wd_expired)
2954 val->intval = POWER_SUPPLY_HEALTH_DEAD;
2955 else if (di->flags.usb_thermal_prot)
2956 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2957 else if (di->flags.vbus_ovv)
2958 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
2959 else
2960 val->intval = POWER_SUPPLY_HEALTH_GOOD;
2961 break;
2962 case POWER_SUPPLY_PROP_ONLINE:
2963 val->intval = di->usb.charger_online;
2964 break;
2965 case POWER_SUPPLY_PROP_PRESENT:
2966 val->intval = di->usb.charger_connected;
2967 break;
2968 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2969 ret = ab8500_charger_get_vbus_voltage(di);
2970 if (ret >= 0)
2971 di->usb.charger_voltage = ret;
2972 val->intval = di->usb.charger_voltage * 1000;
2973 break;
2974 case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2975 /*
2976 * This property is used to indicate when CV mode is entered
2977 * for the USB charger
2978 */
2979 di->usb.cv_active = ab8500_charger_usb_cv(di);
2980 val->intval = di->usb.cv_active;
2981 break;
2982 case POWER_SUPPLY_PROP_CURRENT_NOW:
2983 ret = ab8500_charger_get_usb_current(di);
2984 if (ret >= 0)
2985 di->usb.charger_current = ret;
2986 val->intval = di->usb.charger_current * 1000;
2987 break;
2988 case POWER_SUPPLY_PROP_CURRENT_AVG:
2989 /*
2990 * This property is used to indicate when VBUS has collapsed
2991 * due to too high output current from the USB charger
2992 */
2993 if (di->flags.vbus_collapse)
2994 val->intval = 1;
2995 else
2996 val->intval = 0;
2997 break;
2998 default:
2999 return -EINVAL;
3000 }
3001 return 0;
3002 }
3003
3004 /**
3005 * ab8500_charger_init_hw_registers() - Set up charger related registers
3006 * @di: pointer to the ab8500_charger structure
3007 *
3008 * Set up charger OVV, watchdog and maximum voltage registers as well as
3009 * charging of the backup battery
3010 */
ab8500_charger_init_hw_registers(struct ab8500_charger * di)3011 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
3012 {
3013 int ret = 0;
3014
3015 /* Setup maximum charger current and voltage for ABB cut2.0 */
3016 if (!is_ab8500_1p1_or_earlier(di->parent)) {
3017 ret = abx500_set_register_interruptible(di->dev,
3018 AB8500_CHARGER,
3019 AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
3020 if (ret) {
3021 dev_err(di->dev,
3022 "failed to set CH_VOLT_LVL_MAX_REG\n");
3023 goto out;
3024 }
3025
3026 ret = abx500_set_register_interruptible(di->dev,
3027 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3028 CH_OP_CUR_LVL_1P6);
3029 if (ret) {
3030 dev_err(di->dev,
3031 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
3032 goto out;
3033 }
3034 }
3035
3036 if (is_ab8505_2p0(di->parent))
3037 ret = abx500_mask_and_set_register_interruptible(di->dev,
3038 AB8500_CHARGER,
3039 AB8500_USBCH_CTRL2_REG,
3040 VBUS_AUTO_IN_CURR_LIM_ENA,
3041 VBUS_AUTO_IN_CURR_LIM_ENA);
3042 else
3043 /*
3044 * VBUS OVV set to 6.3V and enable automatic current limitation
3045 */
3046 ret = abx500_set_register_interruptible(di->dev,
3047 AB8500_CHARGER,
3048 AB8500_USBCH_CTRL2_REG,
3049 VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
3050 if (ret) {
3051 dev_err(di->dev,
3052 "failed to set automatic current limitation\n");
3053 goto out;
3054 }
3055
3056 /* Enable main watchdog in OTP */
3057 ret = abx500_set_register_interruptible(di->dev,
3058 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
3059 if (ret) {
3060 dev_err(di->dev, "failed to enable main WD in OTP\n");
3061 goto out;
3062 }
3063
3064 /* Enable main watchdog */
3065 ret = abx500_set_register_interruptible(di->dev,
3066 AB8500_SYS_CTRL2_BLOCK,
3067 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
3068 if (ret) {
3069 dev_err(di->dev, "failed to enable main watchdog\n");
3070 goto out;
3071 }
3072
3073 /*
3074 * Due to internal synchronisation, Enable and Kick watchdog bits
3075 * cannot be enabled in a single write.
3076 * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
3077 * between writing Enable then Kick bits.
3078 */
3079 udelay(63);
3080
3081 /* Kick main watchdog */
3082 ret = abx500_set_register_interruptible(di->dev,
3083 AB8500_SYS_CTRL2_BLOCK,
3084 AB8500_MAIN_WDOG_CTRL_REG,
3085 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
3086 if (ret) {
3087 dev_err(di->dev, "failed to kick main watchdog\n");
3088 goto out;
3089 }
3090
3091 /* Disable main watchdog */
3092 ret = abx500_set_register_interruptible(di->dev,
3093 AB8500_SYS_CTRL2_BLOCK,
3094 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
3095 if (ret) {
3096 dev_err(di->dev, "failed to disable main watchdog\n");
3097 goto out;
3098 }
3099
3100 /* Set watchdog timeout */
3101 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3102 AB8500_CH_WD_TIMER_REG, WD_TIMER);
3103 if (ret) {
3104 dev_err(di->dev, "failed to set charger watchdog timeout\n");
3105 goto out;
3106 }
3107
3108 ret = ab8500_charger_led_en(di, false);
3109 if (ret < 0) {
3110 dev_err(di->dev, "failed to disable LED\n");
3111 goto out;
3112 }
3113
3114 ret = abx500_set_register_interruptible(di->dev,
3115 AB8500_RTC,
3116 AB8500_RTC_BACKUP_CHG_REG,
3117 (di->bm->bkup_bat_v & 0x3) | di->bm->bkup_bat_i);
3118 if (ret) {
3119 dev_err(di->dev, "failed to setup backup battery charging\n");
3120 goto out;
3121 }
3122
3123 /* Enable backup battery charging */
3124 ret = abx500_mask_and_set_register_interruptible(di->dev,
3125 AB8500_RTC, AB8500_RTC_CTRL_REG,
3126 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
3127 if (ret < 0) {
3128 dev_err(di->dev, "%s mask and set failed\n", __func__);
3129 goto out;
3130 }
3131
3132 out:
3133 return ret;
3134 }
3135
3136 /*
3137 * ab8500 charger driver interrupts and their respective isr
3138 */
3139 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
3140 {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
3141 {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
3142 {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
3143 {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
3144 {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
3145 {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
3146 {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
3147 {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
3148 {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
3149 {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
3150 {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
3151 {"VBUS_OVV", ab8500_charger_vbusovv_handler},
3152 {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
3153 {"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
3154 };
3155
ab8500_charger_usb_notifier_call(struct notifier_block * nb,unsigned long event,void * power)3156 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
3157 unsigned long event, void *power)
3158 {
3159 struct ab8500_charger *di =
3160 container_of(nb, struct ab8500_charger, nb);
3161 enum ab8500_usb_state bm_usb_state;
3162 unsigned mA = *((unsigned *)power);
3163
3164 if (!di)
3165 return NOTIFY_DONE;
3166
3167 if (event != USB_EVENT_VBUS) {
3168 dev_dbg(di->dev, "not a standard host, returning\n");
3169 return NOTIFY_DONE;
3170 }
3171
3172 /* TODO: State is fabricate here. See if charger really needs USB
3173 * state or if mA is enough
3174 */
3175 if ((di->usb_state.usb_current == 2) && (mA > 2))
3176 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3177 else if (mA == 0)
3178 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3179 else if (mA == 2)
3180 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3181 else if (mA >= 8) /* 8, 100, 500 */
3182 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3183 else /* Should never occur */
3184 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3185
3186 dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3187 __func__, bm_usb_state, mA);
3188
3189 spin_lock(&di->usb_state.usb_lock);
3190 di->usb_state.state_tmp = bm_usb_state;
3191 di->usb_state.usb_current_tmp = mA;
3192 spin_unlock(&di->usb_state.usb_lock);
3193
3194 /*
3195 * wait for some time until you get updates from the usb stack
3196 * and negotiations are completed
3197 */
3198 queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3199
3200 return NOTIFY_OK;
3201 }
3202
3203 #if defined(CONFIG_PM)
ab8500_charger_resume(struct platform_device * pdev)3204 static int ab8500_charger_resume(struct platform_device *pdev)
3205 {
3206 int ret;
3207 struct ab8500_charger *di = platform_get_drvdata(pdev);
3208
3209 /*
3210 * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3211 * logic. That means we have to continously kick the charger
3212 * watchdog even when no charger is connected. This is only
3213 * valid once the AC charger has been enabled. This is
3214 * a bug that is not handled by the algorithm and the
3215 * watchdog have to be kicked by the charger driver
3216 * when the AC charger is disabled
3217 */
3218 if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3219 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3220 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3221 if (ret)
3222 dev_err(di->dev, "Failed to kick WD!\n");
3223
3224 /* If not already pending start a new timer */
3225 queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3226 round_jiffies(WD_KICK_INTERVAL));
3227 }
3228
3229 /* If we still have a HW failure, schedule a new check */
3230 if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3231 queue_delayed_work(di->charger_wq,
3232 &di->check_hw_failure_work, 0);
3233 }
3234
3235 if (di->flags.vbus_drop_end)
3236 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3237
3238 return 0;
3239 }
3240
ab8500_charger_suspend(struct platform_device * pdev,pm_message_t state)3241 static int ab8500_charger_suspend(struct platform_device *pdev,
3242 pm_message_t state)
3243 {
3244 struct ab8500_charger *di = platform_get_drvdata(pdev);
3245
3246 /* Cancel any pending jobs */
3247 cancel_delayed_work(&di->check_hw_failure_work);
3248 cancel_delayed_work(&di->vbus_drop_end_work);
3249
3250 flush_delayed_work(&di->attach_work);
3251 flush_delayed_work(&di->usb_charger_attached_work);
3252 flush_delayed_work(&di->ac_charger_attached_work);
3253 flush_delayed_work(&di->check_usbchgnotok_work);
3254 flush_delayed_work(&di->check_vbat_work);
3255 flush_delayed_work(&di->kick_wd_work);
3256
3257 flush_work(&di->usb_link_status_work);
3258 flush_work(&di->ac_work);
3259 flush_work(&di->detect_usb_type_work);
3260
3261 if (atomic_read(&di->current_stepping_sessions))
3262 return -EAGAIN;
3263
3264 return 0;
3265 }
3266 #else
3267 #define ab8500_charger_suspend NULL
3268 #define ab8500_charger_resume NULL
3269 #endif
3270
3271 static struct notifier_block charger_nb = {
3272 .notifier_call = ab8500_external_charger_prepare,
3273 };
3274
ab8500_charger_remove(struct platform_device * pdev)3275 static int ab8500_charger_remove(struct platform_device *pdev)
3276 {
3277 struct ab8500_charger *di = platform_get_drvdata(pdev);
3278 int i, irq, ret;
3279
3280 /* Disable AC charging */
3281 ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3282
3283 /* Disable USB charging */
3284 ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3285
3286 /* Disable interrupts */
3287 for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3288 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3289 free_irq(irq, di);
3290 }
3291
3292 /* Backup battery voltage and current disable */
3293 ret = abx500_mask_and_set_register_interruptible(di->dev,
3294 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3295 if (ret < 0)
3296 dev_err(di->dev, "%s mask and set failed\n", __func__);
3297
3298 usb_unregister_notifier(di->usb_phy, &di->nb);
3299 usb_put_phy(di->usb_phy);
3300
3301 /* Delete the work queue */
3302 destroy_workqueue(di->charger_wq);
3303
3304 /* Unregister external charger enable notifier */
3305 if (!di->ac_chg.enabled)
3306 blocking_notifier_chain_unregister(
3307 &charger_notifier_list, &charger_nb);
3308
3309 flush_scheduled_work();
3310 if (di->usb_chg.enabled)
3311 power_supply_unregister(di->usb_chg.psy);
3312
3313 if (di->ac_chg.enabled && !di->ac_chg.external)
3314 power_supply_unregister(di->ac_chg.psy);
3315
3316 return 0;
3317 }
3318
3319 static char *supply_interface[] = {
3320 "ab8500_chargalg",
3321 "ab8500_fg",
3322 "ab8500_btemp",
3323 };
3324
3325 static const struct power_supply_desc ab8500_ac_chg_desc = {
3326 .name = "ab8500_ac",
3327 .type = POWER_SUPPLY_TYPE_MAINS,
3328 .properties = ab8500_charger_ac_props,
3329 .num_properties = ARRAY_SIZE(ab8500_charger_ac_props),
3330 .get_property = ab8500_charger_ac_get_property,
3331 };
3332
3333 static const struct power_supply_desc ab8500_usb_chg_desc = {
3334 .name = "ab8500_usb",
3335 .type = POWER_SUPPLY_TYPE_USB,
3336 .properties = ab8500_charger_usb_props,
3337 .num_properties = ARRAY_SIZE(ab8500_charger_usb_props),
3338 .get_property = ab8500_charger_usb_get_property,
3339 };
3340
ab8500_charger_probe(struct platform_device * pdev)3341 static int ab8500_charger_probe(struct platform_device *pdev)
3342 {
3343 struct device_node *np = pdev->dev.of_node;
3344 struct abx500_bm_data *plat = pdev->dev.platform_data;
3345 struct power_supply_config ac_psy_cfg = {}, usb_psy_cfg = {};
3346 struct ab8500_charger *di;
3347 int irq, i, charger_status, ret = 0, ch_stat;
3348
3349 di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3350 if (!di) {
3351 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3352 return -ENOMEM;
3353 }
3354
3355 if (!plat) {
3356 dev_err(&pdev->dev, "no battery management data supplied\n");
3357 return -EINVAL;
3358 }
3359 di->bm = plat;
3360
3361 if (np) {
3362 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3363 if (ret) {
3364 dev_err(&pdev->dev, "failed to get battery information\n");
3365 return ret;
3366 }
3367 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3368 } else
3369 di->autopower_cfg = false;
3370
3371 /* get parent data */
3372 di->dev = &pdev->dev;
3373 di->parent = dev_get_drvdata(pdev->dev.parent);
3374 di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3375
3376 /* initialize lock */
3377 spin_lock_init(&di->usb_state.usb_lock);
3378 mutex_init(&di->usb_ipt_crnt_lock);
3379
3380 di->autopower = false;
3381 di->invalid_charger_detect_state = 0;
3382
3383 /* AC and USB supply config */
3384 ac_psy_cfg.supplied_to = supply_interface;
3385 ac_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3386 ac_psy_cfg.drv_data = &di->ac_chg;
3387 usb_psy_cfg.supplied_to = supply_interface;
3388 usb_psy_cfg.num_supplicants = ARRAY_SIZE(supply_interface);
3389 usb_psy_cfg.drv_data = &di->usb_chg;
3390
3391 /* AC supply */
3392 /* ux500_charger sub-class */
3393 di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3394 di->ac_chg.ops.check_enable = &ab8500_charger_ac_check_enable;
3395 di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3396 di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3397 di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3398 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3399 di->ac_chg.max_out_curr =
3400 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3401 di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3402 di->ac_chg.enabled = di->bm->ac_enabled;
3403 di->ac_chg.external = false;
3404
3405 /*notifier for external charger enabling*/
3406 if (!di->ac_chg.enabled)
3407 blocking_notifier_chain_register(
3408 &charger_notifier_list, &charger_nb);
3409
3410 /* USB supply */
3411 /* ux500_charger sub-class */
3412 di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3413 di->usb_chg.ops.check_enable = &ab8500_charger_usb_check_enable;
3414 di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3415 di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3416 di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3417 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3418 di->usb_chg.max_out_curr =
3419 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3420 di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3421 di->usb_chg.enabled = di->bm->usb_enabled;
3422 di->usb_chg.external = false;
3423 di->usb_state.usb_current = -1;
3424
3425 /* Create a work queue for the charger */
3426 di->charger_wq = alloc_ordered_workqueue("ab8500_charger_wq",
3427 WQ_MEM_RECLAIM);
3428 if (di->charger_wq == NULL) {
3429 dev_err(di->dev, "failed to create work queue\n");
3430 return -ENOMEM;
3431 }
3432
3433 mutex_init(&di->charger_attached_mutex);
3434
3435 /* Init work for HW failure check */
3436 INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3437 ab8500_charger_check_hw_failure_work);
3438 INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3439 ab8500_charger_check_usbchargernotok_work);
3440
3441 INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3442 ab8500_charger_ac_attached_work);
3443 INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3444 ab8500_charger_usb_attached_work);
3445
3446 /*
3447 * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3448 * logic. That means we have to continously kick the charger
3449 * watchdog even when no charger is connected. This is only
3450 * valid once the AC charger has been enabled. This is
3451 * a bug that is not handled by the algorithm and the
3452 * watchdog have to be kicked by the charger driver
3453 * when the AC charger is disabled
3454 */
3455 INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3456 ab8500_charger_kick_watchdog_work);
3457
3458 INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3459 ab8500_charger_check_vbat_work);
3460
3461 INIT_DELAYED_WORK(&di->attach_work,
3462 ab8500_charger_usb_link_attach_work);
3463
3464 INIT_DELAYED_WORK(&di->usb_state_changed_work,
3465 ab8500_charger_usb_state_changed_work);
3466
3467 INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3468 ab8500_charger_vbus_drop_end_work);
3469
3470 /* Init work for charger detection */
3471 INIT_WORK(&di->usb_link_status_work,
3472 ab8500_charger_usb_link_status_work);
3473 INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3474 INIT_WORK(&di->detect_usb_type_work,
3475 ab8500_charger_detect_usb_type_work);
3476
3477 /* Init work for checking HW status */
3478 INIT_WORK(&di->check_main_thermal_prot_work,
3479 ab8500_charger_check_main_thermal_prot_work);
3480 INIT_WORK(&di->check_usb_thermal_prot_work,
3481 ab8500_charger_check_usb_thermal_prot_work);
3482
3483 /*
3484 * VDD ADC supply needs to be enabled from this driver when there
3485 * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3486 * interrupts during charging
3487 */
3488 di->regu = devm_regulator_get(di->dev, "vddadc");
3489 if (IS_ERR(di->regu)) {
3490 ret = PTR_ERR(di->regu);
3491 dev_err(di->dev, "failed to get vddadc regulator\n");
3492 goto free_charger_wq;
3493 }
3494
3495
3496 /* Initialize OVV, and other registers */
3497 ret = ab8500_charger_init_hw_registers(di);
3498 if (ret) {
3499 dev_err(di->dev, "failed to initialize ABB registers\n");
3500 goto free_charger_wq;
3501 }
3502
3503 /* Register AC charger class */
3504 if (di->ac_chg.enabled) {
3505 di->ac_chg.psy = power_supply_register(di->dev,
3506 &ab8500_ac_chg_desc,
3507 &ac_psy_cfg);
3508 if (IS_ERR(di->ac_chg.psy)) {
3509 dev_err(di->dev, "failed to register AC charger\n");
3510 ret = PTR_ERR(di->ac_chg.psy);
3511 goto free_charger_wq;
3512 }
3513 }
3514
3515 /* Register USB charger class */
3516 if (di->usb_chg.enabled) {
3517 di->usb_chg.psy = power_supply_register(di->dev,
3518 &ab8500_usb_chg_desc,
3519 &usb_psy_cfg);
3520 if (IS_ERR(di->usb_chg.psy)) {
3521 dev_err(di->dev, "failed to register USB charger\n");
3522 ret = PTR_ERR(di->usb_chg.psy);
3523 goto free_ac;
3524 }
3525 }
3526
3527 di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3528 if (IS_ERR_OR_NULL(di->usb_phy)) {
3529 dev_err(di->dev, "failed to get usb transceiver\n");
3530 ret = -EINVAL;
3531 goto free_usb;
3532 }
3533 di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3534 ret = usb_register_notifier(di->usb_phy, &di->nb);
3535 if (ret) {
3536 dev_err(di->dev, "failed to register usb notifier\n");
3537 goto put_usb_phy;
3538 }
3539
3540 /* Identify the connected charger types during startup */
3541 charger_status = ab8500_charger_detect_chargers(di, true);
3542 if (charger_status & AC_PW_CONN) {
3543 di->ac.charger_connected = 1;
3544 di->ac_conn = true;
3545 ab8500_power_supply_changed(di, di->ac_chg.psy);
3546 sysfs_notify(&di->ac_chg.psy->dev.kobj, NULL, "present");
3547 }
3548
3549 if (charger_status & USB_PW_CONN) {
3550 di->vbus_detected = true;
3551 di->vbus_detected_start = true;
3552 queue_work(di->charger_wq,
3553 &di->detect_usb_type_work);
3554 }
3555
3556 /* Register interrupts */
3557 for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3558 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3559 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3560 IRQF_SHARED | IRQF_NO_SUSPEND,
3561 ab8500_charger_irq[i].name, di);
3562
3563 if (ret != 0) {
3564 dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3565 , ab8500_charger_irq[i].name, irq, ret);
3566 goto free_irq;
3567 }
3568 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3569 ab8500_charger_irq[i].name, irq, ret);
3570 }
3571
3572 platform_set_drvdata(pdev, di);
3573
3574 mutex_lock(&di->charger_attached_mutex);
3575
3576 ch_stat = ab8500_charger_detect_chargers(di, false);
3577
3578 if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3579 if (is_ab8500(di->parent))
3580 queue_delayed_work(di->charger_wq,
3581 &di->ac_charger_attached_work,
3582 HZ);
3583 }
3584 if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3585 if (is_ab8500(di->parent))
3586 queue_delayed_work(di->charger_wq,
3587 &di->usb_charger_attached_work,
3588 HZ);
3589 }
3590
3591 mutex_unlock(&di->charger_attached_mutex);
3592
3593 return ret;
3594
3595 free_irq:
3596 usb_unregister_notifier(di->usb_phy, &di->nb);
3597
3598 /* We also have to free all successfully registered irqs */
3599 for (i = i - 1; i >= 0; i--) {
3600 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3601 free_irq(irq, di);
3602 }
3603 put_usb_phy:
3604 usb_put_phy(di->usb_phy);
3605 free_usb:
3606 if (di->usb_chg.enabled)
3607 power_supply_unregister(di->usb_chg.psy);
3608 free_ac:
3609 if (di->ac_chg.enabled)
3610 power_supply_unregister(di->ac_chg.psy);
3611 free_charger_wq:
3612 destroy_workqueue(di->charger_wq);
3613 return ret;
3614 }
3615
3616 static const struct of_device_id ab8500_charger_match[] = {
3617 { .compatible = "stericsson,ab8500-charger", },
3618 { },
3619 };
3620
3621 static struct platform_driver ab8500_charger_driver = {
3622 .probe = ab8500_charger_probe,
3623 .remove = ab8500_charger_remove,
3624 .suspend = ab8500_charger_suspend,
3625 .resume = ab8500_charger_resume,
3626 .driver = {
3627 .name = "ab8500-charger",
3628 .of_match_table = ab8500_charger_match,
3629 },
3630 };
3631
ab8500_charger_init(void)3632 static int __init ab8500_charger_init(void)
3633 {
3634 return platform_driver_register(&ab8500_charger_driver);
3635 }
3636
ab8500_charger_exit(void)3637 static void __exit ab8500_charger_exit(void)
3638 {
3639 platform_driver_unregister(&ab8500_charger_driver);
3640 }
3641
3642 subsys_initcall_sync(ab8500_charger_init);
3643 module_exit(ab8500_charger_exit);
3644
3645 MODULE_LICENSE("GPL v2");
3646 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3647 MODULE_ALIAS("platform:ab8500-charger");
3648 MODULE_DESCRIPTION("AB8500 charger management driver");
3649
