1 /*
2 * TI LP8788 MFD - battery charger driver
3 *
4 * Copyright 2012 Texas Instruments
5 *
6 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 */
13
14 #include <linux/err.h>
15 #include <linux/iio/consumer.h>
16 #include <linux/interrupt.h>
17 #include <linux/irqdomain.h>
18 #include <linux/mfd/lp8788.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/power_supply.h>
22 #include <linux/slab.h>
23 #include <linux/workqueue.h>
24
25 /* register address */
26 #define LP8788_CHG_STATUS 0x07
27 #define LP8788_CHG_IDCIN 0x13
28 #define LP8788_CHG_IBATT 0x14
29 #define LP8788_CHG_VTERM 0x15
30 #define LP8788_CHG_EOC 0x16
31
32 /* mask/shift bits */
33 #define LP8788_CHG_INPUT_STATE_M 0x03 /* Addr 07h */
34 #define LP8788_CHG_STATE_M 0x3C
35 #define LP8788_CHG_STATE_S 2
36 #define LP8788_NO_BATT_M BIT(6)
37 #define LP8788_BAD_BATT_M BIT(7)
38 #define LP8788_CHG_IBATT_M 0x1F /* Addr 14h */
39 #define LP8788_CHG_VTERM_M 0x0F /* Addr 15h */
40 #define LP8788_CHG_EOC_LEVEL_M 0x30 /* Addr 16h */
41 #define LP8788_CHG_EOC_LEVEL_S 4
42 #define LP8788_CHG_EOC_TIME_M 0x0E
43 #define LP8788_CHG_EOC_TIME_S 1
44 #define LP8788_CHG_EOC_MODE_M BIT(0)
45
46 #define LP8788_CHARGER_NAME "charger"
47 #define LP8788_BATTERY_NAME "main_batt"
48
49 #define LP8788_CHG_START 0x11
50 #define LP8788_CHG_END 0x1C
51
52 #define LP8788_ISEL_MAX 23
53 #define LP8788_ISEL_STEP 50
54 #define LP8788_VTERM_MIN 4100
55 #define LP8788_VTERM_STEP 25
56 #define LP8788_MAX_BATT_CAPACITY 100
57 #define LP8788_MAX_CHG_IRQS 11
58
59 enum lp8788_charging_state {
60 LP8788_OFF,
61 LP8788_WARM_UP,
62 LP8788_LOW_INPUT = 0x3,
63 LP8788_PRECHARGE,
64 LP8788_CC,
65 LP8788_CV,
66 LP8788_MAINTENANCE,
67 LP8788_BATTERY_FAULT,
68 LP8788_SYSTEM_SUPPORT = 0xC,
69 LP8788_HIGH_CURRENT = 0xF,
70 LP8788_MAX_CHG_STATE,
71 };
72
73 enum lp8788_charger_adc_sel {
74 LP8788_VBATT,
75 LP8788_BATT_TEMP,
76 LP8788_NUM_CHG_ADC,
77 };
78
79 enum lp8788_charger_input_state {
80 LP8788_SYSTEM_SUPPLY = 1,
81 LP8788_FULL_FUNCTION,
82 };
83
84 /*
85 * struct lp8788_chg_irq
86 * @which : lp8788 interrupt id
87 * @virq : Linux IRQ number from irq_domain
88 */
89 struct lp8788_chg_irq {
90 enum lp8788_int_id which;
91 int virq;
92 };
93
94 /*
95 * struct lp8788_charger
96 * @lp : used for accessing the registers of mfd lp8788 device
97 * @charger : power supply driver for the battery charger
98 * @battery : power supply driver for the battery
99 * @charger_work : work queue for charger input interrupts
100 * @chan : iio channels for getting adc values
101 * eg) battery voltage, capacity and temperature
102 * @irqs : charger dedicated interrupts
103 * @num_irqs : total numbers of charger interrupts
104 * @pdata : charger platform specific data
105 */
106 struct lp8788_charger {
107 struct lp8788 *lp;
108 struct power_supply *charger;
109 struct power_supply *battery;
110 struct work_struct charger_work;
111 struct iio_channel *chan[LP8788_NUM_CHG_ADC];
112 struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
113 int num_irqs;
114 struct lp8788_charger_platform_data *pdata;
115 };
116
117 static char *battery_supplied_to[] = {
118 LP8788_BATTERY_NAME,
119 };
120
121 static enum power_supply_property lp8788_charger_prop[] = {
122 POWER_SUPPLY_PROP_ONLINE,
123 POWER_SUPPLY_PROP_CURRENT_MAX,
124 };
125
126 static enum power_supply_property lp8788_battery_prop[] = {
127 POWER_SUPPLY_PROP_STATUS,
128 POWER_SUPPLY_PROP_HEALTH,
129 POWER_SUPPLY_PROP_PRESENT,
130 POWER_SUPPLY_PROP_VOLTAGE_NOW,
131 POWER_SUPPLY_PROP_CAPACITY,
132 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
133 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
134 POWER_SUPPLY_PROP_TEMP,
135 };
136
lp8788_is_charger_detected(struct lp8788_charger * pchg)137 static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
138 {
139 u8 data;
140
141 lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
142 data &= LP8788_CHG_INPUT_STATE_M;
143
144 return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
145 }
146
lp8788_charger_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)147 static int lp8788_charger_get_property(struct power_supply *psy,
148 enum power_supply_property psp,
149 union power_supply_propval *val)
150 {
151 struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
152 u8 read;
153
154 switch (psp) {
155 case POWER_SUPPLY_PROP_ONLINE:
156 val->intval = lp8788_is_charger_detected(pchg);
157 break;
158 case POWER_SUPPLY_PROP_CURRENT_MAX:
159 lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
160 val->intval = LP8788_ISEL_STEP *
161 (min_t(int, read, LP8788_ISEL_MAX) + 1);
162 break;
163 default:
164 return -EINVAL;
165 }
166
167 return 0;
168 }
169
lp8788_get_battery_status(struct lp8788_charger * pchg,union power_supply_propval * val)170 static int lp8788_get_battery_status(struct lp8788_charger *pchg,
171 union power_supply_propval *val)
172 {
173 enum lp8788_charging_state state;
174 u8 data;
175 int ret;
176
177 ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
178 if (ret)
179 return ret;
180
181 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
182 switch (state) {
183 case LP8788_OFF:
184 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
185 break;
186 case LP8788_PRECHARGE:
187 case LP8788_CC:
188 case LP8788_CV:
189 case LP8788_HIGH_CURRENT:
190 val->intval = POWER_SUPPLY_STATUS_CHARGING;
191 break;
192 case LP8788_MAINTENANCE:
193 val->intval = POWER_SUPPLY_STATUS_FULL;
194 break;
195 default:
196 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
197 break;
198 }
199
200 return 0;
201 }
202
lp8788_get_battery_health(struct lp8788_charger * pchg,union power_supply_propval * val)203 static int lp8788_get_battery_health(struct lp8788_charger *pchg,
204 union power_supply_propval *val)
205 {
206 u8 data;
207 int ret;
208
209 ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
210 if (ret)
211 return ret;
212
213 if (data & LP8788_NO_BATT_M)
214 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
215 else if (data & LP8788_BAD_BATT_M)
216 val->intval = POWER_SUPPLY_HEALTH_DEAD;
217 else
218 val->intval = POWER_SUPPLY_HEALTH_GOOD;
219
220 return 0;
221 }
222
lp8788_get_battery_present(struct lp8788_charger * pchg,union power_supply_propval * val)223 static int lp8788_get_battery_present(struct lp8788_charger *pchg,
224 union power_supply_propval *val)
225 {
226 u8 data;
227 int ret;
228
229 ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
230 if (ret)
231 return ret;
232
233 val->intval = !(data & LP8788_NO_BATT_M);
234 return 0;
235 }
236
lp8788_get_vbatt_adc(struct lp8788_charger * pchg,int * result)237 static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
238 {
239 struct iio_channel *channel = pchg->chan[LP8788_VBATT];
240
241 if (!channel)
242 return -EINVAL;
243
244 return iio_read_channel_processed(channel, result);
245 }
246
lp8788_get_battery_voltage(struct lp8788_charger * pchg,union power_supply_propval * val)247 static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
248 union power_supply_propval *val)
249 {
250 return lp8788_get_vbatt_adc(pchg, &val->intval);
251 }
252
lp8788_get_battery_capacity(struct lp8788_charger * pchg,union power_supply_propval * val)253 static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
254 union power_supply_propval *val)
255 {
256 struct lp8788 *lp = pchg->lp;
257 struct lp8788_charger_platform_data *pdata = pchg->pdata;
258 unsigned int max_vbatt;
259 int vbatt;
260 enum lp8788_charging_state state;
261 u8 data;
262 int ret;
263
264 if (!pdata)
265 return -EINVAL;
266
267 max_vbatt = pdata->max_vbatt_mv;
268 if (max_vbatt == 0)
269 return -EINVAL;
270
271 ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
272 if (ret)
273 return ret;
274
275 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
276
277 if (state == LP8788_MAINTENANCE) {
278 val->intval = LP8788_MAX_BATT_CAPACITY;
279 } else {
280 ret = lp8788_get_vbatt_adc(pchg, &vbatt);
281 if (ret)
282 return ret;
283
284 val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
285 val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
286 }
287
288 return 0;
289 }
290
lp8788_get_battery_temperature(struct lp8788_charger * pchg,union power_supply_propval * val)291 static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
292 union power_supply_propval *val)
293 {
294 struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
295 int result;
296 int ret;
297
298 if (!channel)
299 return -EINVAL;
300
301 ret = iio_read_channel_processed(channel, &result);
302 if (ret < 0)
303 return -EINVAL;
304
305 /* unit: 0.1 'C */
306 val->intval = result * 10;
307
308 return 0;
309 }
310
lp8788_get_battery_charging_current(struct lp8788_charger * pchg,union power_supply_propval * val)311 static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
312 union power_supply_propval *val)
313 {
314 u8 read;
315
316 lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
317 read &= LP8788_CHG_IBATT_M;
318 val->intval = LP8788_ISEL_STEP *
319 (min_t(int, read, LP8788_ISEL_MAX) + 1);
320
321 return 0;
322 }
323
lp8788_get_charging_termination_voltage(struct lp8788_charger * pchg,union power_supply_propval * val)324 static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
325 union power_supply_propval *val)
326 {
327 u8 read;
328
329 lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
330 read &= LP8788_CHG_VTERM_M;
331 val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
332
333 return 0;
334 }
335
lp8788_battery_get_property(struct power_supply * psy,enum power_supply_property psp,union power_supply_propval * val)336 static int lp8788_battery_get_property(struct power_supply *psy,
337 enum power_supply_property psp,
338 union power_supply_propval *val)
339 {
340 struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
341
342 switch (psp) {
343 case POWER_SUPPLY_PROP_STATUS:
344 return lp8788_get_battery_status(pchg, val);
345 case POWER_SUPPLY_PROP_HEALTH:
346 return lp8788_get_battery_health(pchg, val);
347 case POWER_SUPPLY_PROP_PRESENT:
348 return lp8788_get_battery_present(pchg, val);
349 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
350 return lp8788_get_battery_voltage(pchg, val);
351 case POWER_SUPPLY_PROP_CAPACITY:
352 return lp8788_get_battery_capacity(pchg, val);
353 case POWER_SUPPLY_PROP_TEMP:
354 return lp8788_get_battery_temperature(pchg, val);
355 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
356 return lp8788_get_battery_charging_current(pchg, val);
357 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
358 return lp8788_get_charging_termination_voltage(pchg, val);
359 default:
360 return -EINVAL;
361 }
362 }
363
lp8788_is_valid_charger_register(u8 addr)364 static inline bool lp8788_is_valid_charger_register(u8 addr)
365 {
366 return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
367 }
368
lp8788_update_charger_params(struct platform_device * pdev,struct lp8788_charger * pchg)369 static int lp8788_update_charger_params(struct platform_device *pdev,
370 struct lp8788_charger *pchg)
371 {
372 struct lp8788 *lp = pchg->lp;
373 struct lp8788_charger_platform_data *pdata = pchg->pdata;
374 struct lp8788_chg_param *param;
375 int i;
376 int ret;
377
378 if (!pdata || !pdata->chg_params) {
379 dev_info(&pdev->dev, "skip updating charger parameters\n");
380 return 0;
381 }
382
383 /* settting charging parameters */
384 for (i = 0; i < pdata->num_chg_params; i++) {
385 param = pdata->chg_params + i;
386
387 if (lp8788_is_valid_charger_register(param->addr)) {
388 ret = lp8788_write_byte(lp, param->addr, param->val);
389 if (ret)
390 return ret;
391 }
392 }
393
394 return 0;
395 }
396
397 static const struct power_supply_desc lp8788_psy_charger_desc = {
398 .name = LP8788_CHARGER_NAME,
399 .type = POWER_SUPPLY_TYPE_MAINS,
400 .properties = lp8788_charger_prop,
401 .num_properties = ARRAY_SIZE(lp8788_charger_prop),
402 .get_property = lp8788_charger_get_property,
403 };
404
405 static const struct power_supply_desc lp8788_psy_battery_desc = {
406 .name = LP8788_BATTERY_NAME,
407 .type = POWER_SUPPLY_TYPE_BATTERY,
408 .properties = lp8788_battery_prop,
409 .num_properties = ARRAY_SIZE(lp8788_battery_prop),
410 .get_property = lp8788_battery_get_property,
411 };
412
lp8788_psy_register(struct platform_device * pdev,struct lp8788_charger * pchg)413 static int lp8788_psy_register(struct platform_device *pdev,
414 struct lp8788_charger *pchg)
415 {
416 struct power_supply_config charger_cfg = {};
417
418 charger_cfg.supplied_to = battery_supplied_to;
419 charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
420
421 pchg->charger = power_supply_register(&pdev->dev,
422 &lp8788_psy_charger_desc,
423 &charger_cfg);
424 if (IS_ERR(pchg->charger))
425 return -EPERM;
426
427 pchg->battery = power_supply_register(&pdev->dev,
428 &lp8788_psy_battery_desc, NULL);
429 if (IS_ERR(pchg->battery)) {
430 power_supply_unregister(pchg->charger);
431 return -EPERM;
432 }
433
434 return 0;
435 }
436
lp8788_psy_unregister(struct lp8788_charger * pchg)437 static void lp8788_psy_unregister(struct lp8788_charger *pchg)
438 {
439 power_supply_unregister(pchg->battery);
440 power_supply_unregister(pchg->charger);
441 }
442
lp8788_charger_event(struct work_struct * work)443 static void lp8788_charger_event(struct work_struct *work)
444 {
445 struct lp8788_charger *pchg =
446 container_of(work, struct lp8788_charger, charger_work);
447 struct lp8788_charger_platform_data *pdata = pchg->pdata;
448 enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
449
450 pdata->charger_event(pchg->lp, event);
451 }
452
lp8788_find_irq_id(struct lp8788_charger * pchg,int virq,int * id)453 static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
454 {
455 bool found = false;
456 int i;
457
458 for (i = 0; i < pchg->num_irqs; i++) {
459 if (pchg->irqs[i].virq == virq) {
460 *id = pchg->irqs[i].which;
461 found = true;
462 break;
463 }
464 }
465
466 return found;
467 }
468
lp8788_charger_irq_thread(int virq,void * ptr)469 static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
470 {
471 struct lp8788_charger *pchg = ptr;
472 struct lp8788_charger_platform_data *pdata = pchg->pdata;
473 int id = -1;
474
475 if (!lp8788_find_irq_id(pchg, virq, &id))
476 return IRQ_NONE;
477
478 switch (id) {
479 case LP8788_INT_CHG_INPUT_STATE:
480 case LP8788_INT_CHG_STATE:
481 case LP8788_INT_EOC:
482 case LP8788_INT_BATT_LOW:
483 case LP8788_INT_NO_BATT:
484 power_supply_changed(pchg->charger);
485 power_supply_changed(pchg->battery);
486 break;
487 default:
488 break;
489 }
490
491 /* report charger dectection event if used */
492 if (!pdata)
493 goto irq_handled;
494
495 if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
496 schedule_work(&pchg->charger_work);
497
498 irq_handled:
499 return IRQ_HANDLED;
500 }
501
lp8788_set_irqs(struct platform_device * pdev,struct lp8788_charger * pchg,const char * name)502 static int lp8788_set_irqs(struct platform_device *pdev,
503 struct lp8788_charger *pchg, const char *name)
504 {
505 struct resource *r;
506 struct irq_domain *irqdm = pchg->lp->irqdm;
507 int irq_start;
508 int irq_end;
509 int virq;
510 int nr_irq;
511 int i;
512 int ret;
513
514 /* no error even if no irq resource */
515 r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
516 if (!r)
517 return 0;
518
519 irq_start = r->start;
520 irq_end = r->end;
521
522 for (i = irq_start; i <= irq_end; i++) {
523 nr_irq = pchg->num_irqs;
524
525 virq = irq_create_mapping(irqdm, i);
526 pchg->irqs[nr_irq].virq = virq;
527 pchg->irqs[nr_irq].which = i;
528 pchg->num_irqs++;
529
530 ret = request_threaded_irq(virq, NULL,
531 lp8788_charger_irq_thread,
532 0, name, pchg);
533 if (ret)
534 break;
535 }
536
537 if (i <= irq_end)
538 goto err_free_irq;
539
540 return 0;
541
542 err_free_irq:
543 for (i = 0; i < pchg->num_irqs; i++)
544 free_irq(pchg->irqs[i].virq, pchg);
545 return ret;
546 }
547
lp8788_irq_register(struct platform_device * pdev,struct lp8788_charger * pchg)548 static int lp8788_irq_register(struct platform_device *pdev,
549 struct lp8788_charger *pchg)
550 {
551 const char *name[] = {
552 LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
553 };
554 int i;
555 int ret;
556
557 INIT_WORK(&pchg->charger_work, lp8788_charger_event);
558 pchg->num_irqs = 0;
559
560 for (i = 0; i < ARRAY_SIZE(name); i++) {
561 ret = lp8788_set_irqs(pdev, pchg, name[i]);
562 if (ret) {
563 dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
564 return ret;
565 }
566 }
567
568 if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
569 dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
570 pchg->num_irqs);
571 return -EINVAL;
572 }
573
574
575 return 0;
576 }
577
lp8788_irq_unregister(struct platform_device * pdev,struct lp8788_charger * pchg)578 static void lp8788_irq_unregister(struct platform_device *pdev,
579 struct lp8788_charger *pchg)
580 {
581 int i;
582 int irq;
583
584 for (i = 0; i < pchg->num_irqs; i++) {
585 irq = pchg->irqs[i].virq;
586 if (!irq)
587 continue;
588
589 free_irq(irq, pchg);
590 }
591 }
592
lp8788_setup_adc_channel(struct device * dev,struct lp8788_charger * pchg)593 static void lp8788_setup_adc_channel(struct device *dev,
594 struct lp8788_charger *pchg)
595 {
596 struct lp8788_charger_platform_data *pdata = pchg->pdata;
597 struct iio_channel *chan;
598
599 if (!pdata)
600 return;
601
602 /* ADC channel for battery voltage */
603 chan = iio_channel_get(dev, pdata->adc_vbatt);
604 pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
605
606 /* ADC channel for battery temperature */
607 chan = iio_channel_get(dev, pdata->adc_batt_temp);
608 pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
609 }
610
lp8788_release_adc_channel(struct lp8788_charger * pchg)611 static void lp8788_release_adc_channel(struct lp8788_charger *pchg)
612 {
613 int i;
614
615 for (i = 0; i < LP8788_NUM_CHG_ADC; i++) {
616 if (!pchg->chan[i])
617 continue;
618
619 iio_channel_release(pchg->chan[i]);
620 pchg->chan[i] = NULL;
621 }
622 }
623
lp8788_show_charger_status(struct device * dev,struct device_attribute * attr,char * buf)624 static ssize_t lp8788_show_charger_status(struct device *dev,
625 struct device_attribute *attr, char *buf)
626 {
627 struct lp8788_charger *pchg = dev_get_drvdata(dev);
628 enum lp8788_charging_state state;
629 static const char * const desc[LP8788_MAX_CHG_STATE] = {
630 [LP8788_OFF] = "CHARGER OFF",
631 [LP8788_WARM_UP] = "WARM UP",
632 [LP8788_LOW_INPUT] = "LOW INPUT STATE",
633 [LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
634 [LP8788_CC] = "CHARGING - CC",
635 [LP8788_CV] = "CHARGING - CV",
636 [LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
637 [LP8788_BATTERY_FAULT] = "BATTERY FAULT",
638 [LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
639 [LP8788_HIGH_CURRENT] = "HIGH CURRENT",
640 };
641 u8 data;
642
643 lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
644 state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
645
646 return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]);
647 }
648
lp8788_show_eoc_time(struct device * dev,struct device_attribute * attr,char * buf)649 static ssize_t lp8788_show_eoc_time(struct device *dev,
650 struct device_attribute *attr, char *buf)
651 {
652 struct lp8788_charger *pchg = dev_get_drvdata(dev);
653 static const char * const stime[] = {
654 "400ms", "5min", "10min", "15min",
655 "20min", "25min", "30min", "No timeout"
656 };
657 u8 val;
658
659 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
660 val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
661
662 return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n",
663 stime[val]);
664 }
665
lp8788_show_eoc_level(struct device * dev,struct device_attribute * attr,char * buf)666 static ssize_t lp8788_show_eoc_level(struct device *dev,
667 struct device_attribute *attr, char *buf)
668 {
669 struct lp8788_charger *pchg = dev_get_drvdata(dev);
670 static const char * const abs_level[] = {
671 "25mA", "49mA", "75mA", "98mA"
672 };
673 static const char * const relative_level[] = {
674 "5%", "10%", "15%", "20%"
675 };
676 const char *level;
677 u8 val;
678 u8 mode;
679
680 lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
681
682 mode = val & LP8788_CHG_EOC_MODE_M;
683 val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
684 level = mode ? abs_level[val] : relative_level[val];
685
686 return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level);
687 }
688
689 static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
690 static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
691 static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
692
693 static struct attribute *lp8788_charger_attr[] = {
694 &dev_attr_charger_status.attr,
695 &dev_attr_eoc_time.attr,
696 &dev_attr_eoc_level.attr,
697 NULL,
698 };
699
700 static const struct attribute_group lp8788_attr_group = {
701 .attrs = lp8788_charger_attr,
702 };
703
lp8788_charger_probe(struct platform_device * pdev)704 static int lp8788_charger_probe(struct platform_device *pdev)
705 {
706 struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
707 struct lp8788_charger *pchg;
708 struct device *dev = &pdev->dev;
709 int ret;
710
711 pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
712 if (!pchg)
713 return -ENOMEM;
714
715 pchg->lp = lp;
716 pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
717 platform_set_drvdata(pdev, pchg);
718
719 ret = lp8788_update_charger_params(pdev, pchg);
720 if (ret)
721 return ret;
722
723 lp8788_setup_adc_channel(&pdev->dev, pchg);
724
725 ret = lp8788_psy_register(pdev, pchg);
726 if (ret)
727 return ret;
728
729 ret = sysfs_create_group(&pdev->dev.kobj, &lp8788_attr_group);
730 if (ret) {
731 lp8788_psy_unregister(pchg);
732 return ret;
733 }
734
735 ret = lp8788_irq_register(pdev, pchg);
736 if (ret)
737 dev_warn(dev, "failed to register charger irq: %d\n", ret);
738
739 return 0;
740 }
741
lp8788_charger_remove(struct platform_device * pdev)742 static int lp8788_charger_remove(struct platform_device *pdev)
743 {
744 struct lp8788_charger *pchg = platform_get_drvdata(pdev);
745
746 flush_work(&pchg->charger_work);
747 lp8788_irq_unregister(pdev, pchg);
748 sysfs_remove_group(&pdev->dev.kobj, &lp8788_attr_group);
749 lp8788_psy_unregister(pchg);
750 lp8788_release_adc_channel(pchg);
751
752 return 0;
753 }
754
755 static struct platform_driver lp8788_charger_driver = {
756 .probe = lp8788_charger_probe,
757 .remove = lp8788_charger_remove,
758 .driver = {
759 .name = LP8788_DEV_CHARGER,
760 },
761 };
762 module_platform_driver(lp8788_charger_driver);
763
764 MODULE_DESCRIPTION("TI LP8788 Charger Driver");
765 MODULE_AUTHOR("Milo Kim");
766 MODULE_LICENSE("GPL");
767 MODULE_ALIAS("platform:lp8788-charger");
768
