1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
4 *
5 * Copyright (C) 2016-2017 Hans de Goede <hdegoede@redhat.com>
6 * Copyright (C) 2014 Intel Corporation
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 */
10
11 #include <linux/dmi.h>
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/device.h>
15 #include <linux/regmap.h>
16 #include <linux/jiffies.h>
17 #include <linux/interrupt.h>
18 #include <linux/mfd/axp20x.h>
19 #include <linux/platform_device.h>
20 #include <linux/power_supply.h>
21 #include <linux/iio/consumer.h>
22 #include <linux/debugfs.h>
23 #include <linux/seq_file.h>
24 #include <asm/unaligned.h>
25
26 #define PS_STAT_VBUS_TRIGGER (1 << 0)
27 #define PS_STAT_BAT_CHRG_DIR (1 << 2)
28 #define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3)
29 #define PS_STAT_VBUS_VALID (1 << 4)
30 #define PS_STAT_VBUS_PRESENT (1 << 5)
31
32 #define CHRG_STAT_BAT_SAFE_MODE (1 << 3)
33 #define CHRG_STAT_BAT_VALID (1 << 4)
34 #define CHRG_STAT_BAT_PRESENT (1 << 5)
35 #define CHRG_STAT_CHARGING (1 << 6)
36 #define CHRG_STAT_PMIC_OTP (1 << 7)
37
38 #define CHRG_CCCV_CC_MASK 0xf /* 4 bits */
39 #define CHRG_CCCV_CC_BIT_POS 0
40 #define CHRG_CCCV_CC_OFFSET 200 /* 200mA */
41 #define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */
42 #define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */
43 #define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */
44 #define CHRG_CCCV_CV_BIT_POS 5
45 #define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */
46 #define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */
47 #define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */
48 #define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */
49 #define CHRG_CCCV_CHG_EN (1 << 7)
50
51 #define FG_CNTL_OCV_ADJ_STAT (1 << 2)
52 #define FG_CNTL_OCV_ADJ_EN (1 << 3)
53 #define FG_CNTL_CAP_ADJ_STAT (1 << 4)
54 #define FG_CNTL_CAP_ADJ_EN (1 << 5)
55 #define FG_CNTL_CC_EN (1 << 6)
56 #define FG_CNTL_GAUGE_EN (1 << 7)
57
58 #define FG_15BIT_WORD_VALID (1 << 15)
59 #define FG_15BIT_VAL_MASK 0x7fff
60
61 #define FG_REP_CAP_VALID (1 << 7)
62 #define FG_REP_CAP_VAL_MASK 0x7F
63
64 #define FG_DES_CAP1_VALID (1 << 7)
65 #define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */
66
67 #define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */
68
69 #define FG_OCV_CAP_VALID (1 << 7)
70 #define FG_OCV_CAP_VAL_MASK 0x7F
71 #define FG_CC_CAP_VALID (1 << 7)
72 #define FG_CC_CAP_VAL_MASK 0x7F
73
74 #define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */
75 #define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */
76 #define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */
77 #define FG_LOW_CAP_WARN_THR 14 /* 14 perc */
78 #define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */
79 #define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */
80
81 #define NR_RETRY_CNT 3
82 #define DEV_NAME "axp288_fuel_gauge"
83
84 /* 1.1mV per LSB expressed in uV */
85 #define VOLTAGE_FROM_ADC(a) ((a * 11) / 10)
86 /* properties converted to uV, uA */
87 #define PROP_VOLT(a) ((a) * 1000)
88 #define PROP_CURR(a) ((a) * 1000)
89
90 #define AXP288_FG_INTR_NUM 6
91 enum {
92 QWBTU_IRQ = 0,
93 WBTU_IRQ,
94 QWBTO_IRQ,
95 WBTO_IRQ,
96 WL2_IRQ,
97 WL1_IRQ,
98 };
99
100 enum {
101 BAT_TEMP = 0,
102 PMIC_TEMP,
103 SYSTEM_TEMP,
104 BAT_CHRG_CURR,
105 BAT_D_CURR,
106 BAT_VOLT,
107 IIO_CHANNEL_NUM
108 };
109
110 struct axp288_fg_info {
111 struct platform_device *pdev;
112 struct regmap *regmap;
113 struct regmap_irq_chip_data *regmap_irqc;
114 int irq[AXP288_FG_INTR_NUM];
115 struct iio_channel *iio_channel[IIO_CHANNEL_NUM];
116 struct power_supply *bat;
117 struct mutex lock;
118 int status;
119 int max_volt;
120 struct dentry *debug_file;
121 };
122
123 static enum power_supply_property fuel_gauge_props[] = {
124 POWER_SUPPLY_PROP_STATUS,
125 POWER_SUPPLY_PROP_PRESENT,
126 POWER_SUPPLY_PROP_HEALTH,
127 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
128 POWER_SUPPLY_PROP_VOLTAGE_NOW,
129 POWER_SUPPLY_PROP_VOLTAGE_OCV,
130 POWER_SUPPLY_PROP_CURRENT_NOW,
131 POWER_SUPPLY_PROP_CAPACITY,
132 POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
133 POWER_SUPPLY_PROP_TECHNOLOGY,
134 POWER_SUPPLY_PROP_CHARGE_FULL,
135 POWER_SUPPLY_PROP_CHARGE_NOW,
136 };
137
fuel_gauge_reg_readb(struct axp288_fg_info * info,int reg)138 static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
139 {
140 int ret, i;
141 unsigned int val;
142
143 for (i = 0; i < NR_RETRY_CNT; i++) {
144 ret = regmap_read(info->regmap, reg, &val);
145 if (ret == -EBUSY)
146 continue;
147 else
148 break;
149 }
150
151 if (ret < 0) {
152 dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", ret);
153 return ret;
154 }
155
156 return val;
157 }
158
fuel_gauge_reg_writeb(struct axp288_fg_info * info,int reg,u8 val)159 static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
160 {
161 int ret;
162
163 ret = regmap_write(info->regmap, reg, (unsigned int)val);
164
165 if (ret < 0)
166 dev_err(&info->pdev->dev, "axp288 reg write err:%d\n", ret);
167
168 return ret;
169 }
170
fuel_gauge_read_15bit_word(struct axp288_fg_info * info,int reg)171 static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
172 {
173 unsigned char buf[2];
174 int ret;
175
176 ret = regmap_bulk_read(info->regmap, reg, buf, 2);
177 if (ret < 0) {
178 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
179 reg, ret);
180 return ret;
181 }
182
183 ret = get_unaligned_be16(buf);
184 if (!(ret & FG_15BIT_WORD_VALID)) {
185 dev_err(&info->pdev->dev, "Error reg 0x%02x contents not valid\n",
186 reg);
187 return -ENXIO;
188 }
189
190 return ret & FG_15BIT_VAL_MASK;
191 }
192
fuel_gauge_read_12bit_word(struct axp288_fg_info * info,int reg)193 static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
194 {
195 unsigned char buf[2];
196 int ret;
197
198 ret = regmap_bulk_read(info->regmap, reg, buf, 2);
199 if (ret < 0) {
200 dev_err(&info->pdev->dev, "Error reading reg 0x%02x err: %d\n",
201 reg, ret);
202 return ret;
203 }
204
205 /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
206 return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
207 }
208
209 #ifdef CONFIG_DEBUG_FS
fuel_gauge_debug_show(struct seq_file * s,void * data)210 static int fuel_gauge_debug_show(struct seq_file *s, void *data)
211 {
212 struct axp288_fg_info *info = s->private;
213 int raw_val, ret;
214
215 seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
216 AXP20X_PWR_INPUT_STATUS,
217 fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
218 seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
219 AXP20X_PWR_OP_MODE,
220 fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
221 seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
222 AXP20X_CHRG_CTRL1,
223 fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
224 seq_printf(s, " VLTF[%02x] : %02x\n",
225 AXP20X_V_LTF_DISCHRG,
226 fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
227 seq_printf(s, " VHTF[%02x] : %02x\n",
228 AXP20X_V_HTF_DISCHRG,
229 fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
230 seq_printf(s, " CC_CTRL[%02x] : %02x\n",
231 AXP20X_CC_CTRL,
232 fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
233 seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
234 AXP20X_FG_RES,
235 fuel_gauge_reg_readb(info, AXP20X_FG_RES));
236 seq_printf(s, " FG_RDC1[%02x] : %02x\n",
237 AXP288_FG_RDC1_REG,
238 fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
239 seq_printf(s, " FG_RDC0[%02x] : %02x\n",
240 AXP288_FG_RDC0_REG,
241 fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
242 seq_printf(s, " FG_OCV[%02x] : %04x\n",
243 AXP288_FG_OCVH_REG,
244 fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG));
245 seq_printf(s, " FG_DES_CAP[%02x] : %04x\n",
246 AXP288_FG_DES_CAP1_REG,
247 fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG));
248 seq_printf(s, " FG_CC_MTR[%02x] : %04x\n",
249 AXP288_FG_CC_MTR1_REG,
250 fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG));
251 seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
252 AXP288_FG_OCV_CAP_REG,
253 fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
254 seq_printf(s, " FG_CC_CAP[%02x] : %02x\n",
255 AXP288_FG_CC_CAP_REG,
256 fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
257 seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
258 AXP288_FG_LOW_CAP_REG,
259 fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
260 seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
261 AXP288_FG_TUNE0,
262 fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
263 seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
264 AXP288_FG_TUNE1,
265 fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
266 seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
267 AXP288_FG_TUNE2,
268 fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
269 seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
270 AXP288_FG_TUNE3,
271 fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
272 seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
273 AXP288_FG_TUNE4,
274 fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
275 seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
276 AXP288_FG_TUNE5,
277 fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
278
279 ret = iio_read_channel_raw(info->iio_channel[BAT_TEMP], &raw_val);
280 if (ret >= 0)
281 seq_printf(s, "axp288-batttemp : %d\n", raw_val);
282 ret = iio_read_channel_raw(info->iio_channel[PMIC_TEMP], &raw_val);
283 if (ret >= 0)
284 seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
285 ret = iio_read_channel_raw(info->iio_channel[SYSTEM_TEMP], &raw_val);
286 if (ret >= 0)
287 seq_printf(s, "axp288-systtemp : %d\n", raw_val);
288 ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &raw_val);
289 if (ret >= 0)
290 seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
291 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &raw_val);
292 if (ret >= 0)
293 seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
294 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
295 if (ret >= 0)
296 seq_printf(s, "axp288-battvolt : %d\n", raw_val);
297
298 return 0;
299 }
300
301 DEFINE_SHOW_ATTRIBUTE(fuel_gauge_debug);
302
fuel_gauge_create_debugfs(struct axp288_fg_info * info)303 static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
304 {
305 info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
306 info, &fuel_gauge_debug_fops);
307 }
308
fuel_gauge_remove_debugfs(struct axp288_fg_info * info)309 static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
310 {
311 debugfs_remove(info->debug_file);
312 }
313 #else
fuel_gauge_create_debugfs(struct axp288_fg_info * info)314 static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
315 {
316 }
fuel_gauge_remove_debugfs(struct axp288_fg_info * info)317 static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
318 {
319 }
320 #endif
321
fuel_gauge_get_status(struct axp288_fg_info * info)322 static void fuel_gauge_get_status(struct axp288_fg_info *info)
323 {
324 int pwr_stat, fg_res, curr, ret;
325
326 pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
327 if (pwr_stat < 0) {
328 dev_err(&info->pdev->dev,
329 "PWR STAT read failed:%d\n", pwr_stat);
330 return;
331 }
332
333 /* Report full if Vbus is valid and the reported capacity is 100% */
334 if (!(pwr_stat & PS_STAT_VBUS_VALID))
335 goto not_full;
336
337 fg_res = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
338 if (fg_res < 0) {
339 dev_err(&info->pdev->dev, "FG RES read failed: %d\n", fg_res);
340 return;
341 }
342 if (!(fg_res & FG_REP_CAP_VALID))
343 goto not_full;
344
345 fg_res &= ~FG_REP_CAP_VALID;
346 if (fg_res == 100) {
347 info->status = POWER_SUPPLY_STATUS_FULL;
348 return;
349 }
350
351 /*
352 * Sometimes the charger turns itself off before fg-res reaches 100%.
353 * When this happens the AXP288 reports a not-charging status and
354 * 0 mA discharge current.
355 */
356 if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR))
357 goto not_full;
358
359 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &curr);
360 if (ret < 0) {
361 dev_err(&info->pdev->dev, "FG get current failed: %d\n", ret);
362 return;
363 }
364 if (curr == 0) {
365 info->status = POWER_SUPPLY_STATUS_FULL;
366 return;
367 }
368
369 not_full:
370 if (pwr_stat & PS_STAT_BAT_CHRG_DIR)
371 info->status = POWER_SUPPLY_STATUS_CHARGING;
372 else
373 info->status = POWER_SUPPLY_STATUS_DISCHARGING;
374 }
375
fuel_gauge_get_vbatt(struct axp288_fg_info * info,int * vbatt)376 static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
377 {
378 int ret = 0, raw_val;
379
380 ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &raw_val);
381 if (ret < 0)
382 goto vbatt_read_fail;
383
384 *vbatt = VOLTAGE_FROM_ADC(raw_val);
385 vbatt_read_fail:
386 return ret;
387 }
388
fuel_gauge_get_current(struct axp288_fg_info * info,int * cur)389 static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
390 {
391 int ret, discharge;
392
393 /* First check discharge current, so that we do only 1 read on bat. */
394 ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &discharge);
395 if (ret < 0)
396 return ret;
397
398 if (discharge > 0) {
399 *cur = -1 * discharge;
400 return 0;
401 }
402
403 return iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], cur);
404 }
405
fuel_gauge_get_vocv(struct axp288_fg_info * info,int * vocv)406 static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
407 {
408 int ret;
409
410 ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
411 if (ret >= 0)
412 *vocv = VOLTAGE_FROM_ADC(ret);
413
414 return ret;
415 }
416
fuel_gauge_battery_health(struct axp288_fg_info * info)417 static int fuel_gauge_battery_health(struct axp288_fg_info *info)
418 {
419 int ret, vocv, health = POWER_SUPPLY_HEALTH_UNKNOWN;
420
421 ret = fuel_gauge_get_vocv(info, &vocv);
422 if (ret < 0)
423 goto health_read_fail;
424
425 if (vocv > info->max_volt)
426 health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
427 else
428 health = POWER_SUPPLY_HEALTH_GOOD;
429
430 health_read_fail:
431 return health;
432 }
433
fuel_gauge_get_property(struct power_supply * ps,enum power_supply_property prop,union power_supply_propval * val)434 static int fuel_gauge_get_property(struct power_supply *ps,
435 enum power_supply_property prop,
436 union power_supply_propval *val)
437 {
438 struct axp288_fg_info *info = power_supply_get_drvdata(ps);
439 int ret = 0, value;
440
441 mutex_lock(&info->lock);
442 switch (prop) {
443 case POWER_SUPPLY_PROP_STATUS:
444 fuel_gauge_get_status(info);
445 val->intval = info->status;
446 break;
447 case POWER_SUPPLY_PROP_HEALTH:
448 val->intval = fuel_gauge_battery_health(info);
449 break;
450 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
451 ret = fuel_gauge_get_vbatt(info, &value);
452 if (ret < 0)
453 goto fuel_gauge_read_err;
454 val->intval = PROP_VOLT(value);
455 break;
456 case POWER_SUPPLY_PROP_VOLTAGE_OCV:
457 ret = fuel_gauge_get_vocv(info, &value);
458 if (ret < 0)
459 goto fuel_gauge_read_err;
460 val->intval = PROP_VOLT(value);
461 break;
462 case POWER_SUPPLY_PROP_CURRENT_NOW:
463 ret = fuel_gauge_get_current(info, &value);
464 if (ret < 0)
465 goto fuel_gauge_read_err;
466 val->intval = PROP_CURR(value);
467 break;
468 case POWER_SUPPLY_PROP_PRESENT:
469 ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
470 if (ret < 0)
471 goto fuel_gauge_read_err;
472
473 if (ret & CHRG_STAT_BAT_PRESENT)
474 val->intval = 1;
475 else
476 val->intval = 0;
477 break;
478 case POWER_SUPPLY_PROP_CAPACITY:
479 ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
480 if (ret < 0)
481 goto fuel_gauge_read_err;
482
483 if (!(ret & FG_REP_CAP_VALID))
484 dev_err(&info->pdev->dev,
485 "capacity measurement not valid\n");
486 val->intval = (ret & FG_REP_CAP_VAL_MASK);
487 break;
488 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
489 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
490 if (ret < 0)
491 goto fuel_gauge_read_err;
492 val->intval = (ret & 0x0f);
493 break;
494 case POWER_SUPPLY_PROP_TECHNOLOGY:
495 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
496 break;
497 case POWER_SUPPLY_PROP_CHARGE_NOW:
498 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
499 if (ret < 0)
500 goto fuel_gauge_read_err;
501
502 val->intval = ret * FG_DES_CAP_RES_LSB;
503 break;
504 case POWER_SUPPLY_PROP_CHARGE_FULL:
505 ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
506 if (ret < 0)
507 goto fuel_gauge_read_err;
508
509 val->intval = ret * FG_DES_CAP_RES_LSB;
510 break;
511 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
512 val->intval = PROP_VOLT(info->max_volt);
513 break;
514 default:
515 mutex_unlock(&info->lock);
516 return -EINVAL;
517 }
518
519 mutex_unlock(&info->lock);
520 return 0;
521
522 fuel_gauge_read_err:
523 mutex_unlock(&info->lock);
524 return ret;
525 }
526
fuel_gauge_set_property(struct power_supply * ps,enum power_supply_property prop,const union power_supply_propval * val)527 static int fuel_gauge_set_property(struct power_supply *ps,
528 enum power_supply_property prop,
529 const union power_supply_propval *val)
530 {
531 struct axp288_fg_info *info = power_supply_get_drvdata(ps);
532 int ret = 0;
533
534 mutex_lock(&info->lock);
535 switch (prop) {
536 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
537 if ((val->intval < 0) || (val->intval > 15)) {
538 ret = -EINVAL;
539 break;
540 }
541 ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
542 if (ret < 0)
543 break;
544 ret &= 0xf0;
545 ret |= (val->intval & 0xf);
546 ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
547 break;
548 default:
549 ret = -EINVAL;
550 break;
551 }
552
553 mutex_unlock(&info->lock);
554 return ret;
555 }
556
fuel_gauge_property_is_writeable(struct power_supply * psy,enum power_supply_property psp)557 static int fuel_gauge_property_is_writeable(struct power_supply *psy,
558 enum power_supply_property psp)
559 {
560 int ret;
561
562 switch (psp) {
563 case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
564 ret = 1;
565 break;
566 default:
567 ret = 0;
568 }
569
570 return ret;
571 }
572
fuel_gauge_thread_handler(int irq,void * dev)573 static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
574 {
575 struct axp288_fg_info *info = dev;
576 int i;
577
578 for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
579 if (info->irq[i] == irq)
580 break;
581 }
582
583 if (i >= AXP288_FG_INTR_NUM) {
584 dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
585 return IRQ_NONE;
586 }
587
588 switch (i) {
589 case QWBTU_IRQ:
590 dev_info(&info->pdev->dev,
591 "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
592 break;
593 case WBTU_IRQ:
594 dev_info(&info->pdev->dev,
595 "Battery under temperature in work mode IRQ (WBTU)\n");
596 break;
597 case QWBTO_IRQ:
598 dev_info(&info->pdev->dev,
599 "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
600 break;
601 case WBTO_IRQ:
602 dev_info(&info->pdev->dev,
603 "Battery over temperature in work mode IRQ (WBTO)\n");
604 break;
605 case WL2_IRQ:
606 dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
607 break;
608 case WL1_IRQ:
609 dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
610 break;
611 default:
612 dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
613 }
614
615 power_supply_changed(info->bat);
616 return IRQ_HANDLED;
617 }
618
fuel_gauge_external_power_changed(struct power_supply * psy)619 static void fuel_gauge_external_power_changed(struct power_supply *psy)
620 {
621 struct axp288_fg_info *info = power_supply_get_drvdata(psy);
622
623 power_supply_changed(info->bat);
624 }
625
626 static const struct power_supply_desc fuel_gauge_desc = {
627 .name = DEV_NAME,
628 .type = POWER_SUPPLY_TYPE_BATTERY,
629 .properties = fuel_gauge_props,
630 .num_properties = ARRAY_SIZE(fuel_gauge_props),
631 .get_property = fuel_gauge_get_property,
632 .set_property = fuel_gauge_set_property,
633 .property_is_writeable = fuel_gauge_property_is_writeable,
634 .external_power_changed = fuel_gauge_external_power_changed,
635 };
636
fuel_gauge_init_irq(struct axp288_fg_info * info)637 static void fuel_gauge_init_irq(struct axp288_fg_info *info)
638 {
639 int ret, i, pirq;
640
641 for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
642 pirq = platform_get_irq(info->pdev, i);
643 info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
644 if (info->irq[i] < 0) {
645 dev_warn(&info->pdev->dev,
646 "regmap_irq get virq failed for IRQ %d: %d\n",
647 pirq, info->irq[i]);
648 info->irq[i] = -1;
649 goto intr_failed;
650 }
651 ret = request_threaded_irq(info->irq[i],
652 NULL, fuel_gauge_thread_handler,
653 IRQF_ONESHOT, DEV_NAME, info);
654 if (ret) {
655 dev_warn(&info->pdev->dev,
656 "request irq failed for IRQ %d: %d\n",
657 pirq, info->irq[i]);
658 info->irq[i] = -1;
659 goto intr_failed;
660 } else {
661 dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
662 pirq, info->irq[i]);
663 }
664 }
665 return;
666
667 intr_failed:
668 for (; i > 0; i--) {
669 free_irq(info->irq[i - 1], info);
670 info->irq[i - 1] = -1;
671 }
672 }
673
674 /*
675 * Some devices have no battery (HDMI sticks) and the axp288 battery's
676 * detection reports one despite it not being there.
677 * Please keep this listed sorted alphabetically.
678 */
679 static const struct dmi_system_id axp288_fuel_gauge_blacklist[] = {
680 {
681 /* ACEPC T8 Cherry Trail Z8350 mini PC */
682 .matches = {
683 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
684 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
685 DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"),
686 /* also match on somewhat unique bios-version */
687 DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
688 },
689 },
690 {
691 /* ACEPC T11 Cherry Trail Z8350 mini PC */
692 .matches = {
693 DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
694 DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
695 DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"),
696 /* also match on somewhat unique bios-version */
697 DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
698 },
699 },
700 {
701 /* ECS EF20EA */
702 .matches = {
703 DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
704 },
705 },
706 {
707 /* Intel Cherry Trail Compute Stick, Windows version */
708 .matches = {
709 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
710 DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"),
711 },
712 },
713 {
714 /* Intel Cherry Trail Compute Stick, version without an OS */
715 .matches = {
716 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
717 DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"),
718 },
719 },
720 {
721 /* Meegopad T08 */
722 .matches = {
723 DMI_MATCH(DMI_SYS_VENDOR, "Default string"),
724 DMI_MATCH(DMI_BOARD_VENDOR, "To be filled by OEM."),
725 DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
726 DMI_MATCH(DMI_BOARD_VERSION, "V1.1"),
727 },
728 },
729 {
730 /* Minix Neo Z83-4 mini PC */
731 .matches = {
732 DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
733 DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
734 }
735 },
736 {}
737 };
738
axp288_fuel_gauge_probe(struct platform_device * pdev)739 static int axp288_fuel_gauge_probe(struct platform_device *pdev)
740 {
741 int i, ret = 0;
742 struct axp288_fg_info *info;
743 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
744 struct power_supply_config psy_cfg = {};
745 static const char * const iio_chan_name[] = {
746 [BAT_TEMP] = "axp288-batt-temp",
747 [PMIC_TEMP] = "axp288-pmic-temp",
748 [SYSTEM_TEMP] = "axp288-system-temp",
749 [BAT_CHRG_CURR] = "axp288-chrg-curr",
750 [BAT_D_CURR] = "axp288-chrg-d-curr",
751 [BAT_VOLT] = "axp288-batt-volt",
752 };
753 unsigned int val;
754
755 if (dmi_check_system(axp288_fuel_gauge_blacklist))
756 return -ENODEV;
757
758 /*
759 * On some devices the fuelgauge and charger parts of the axp288 are
760 * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
761 */
762 ret = regmap_read(axp20x->regmap, AXP20X_CC_CTRL, &val);
763 if (ret < 0)
764 return ret;
765 if (val == 0)
766 return -ENODEV;
767
768 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
769 if (!info)
770 return -ENOMEM;
771
772 info->pdev = pdev;
773 info->regmap = axp20x->regmap;
774 info->regmap_irqc = axp20x->regmap_irqc;
775 info->status = POWER_SUPPLY_STATUS_UNKNOWN;
776
777 platform_set_drvdata(pdev, info);
778
779 mutex_init(&info->lock);
780
781 for (i = 0; i < IIO_CHANNEL_NUM; i++) {
782 /*
783 * Note cannot use devm_iio_channel_get because x86 systems
784 * lack the device<->channel maps which iio_channel_get will
785 * try to use when passed a non NULL device pointer.
786 */
787 info->iio_channel[i] =
788 iio_channel_get(NULL, iio_chan_name[i]);
789 if (IS_ERR(info->iio_channel[i])) {
790 ret = PTR_ERR(info->iio_channel[i]);
791 dev_dbg(&pdev->dev, "error getting iiochan %s: %d\n",
792 iio_chan_name[i], ret);
793 /* Wait for axp288_adc to load */
794 if (ret == -ENODEV)
795 ret = -EPROBE_DEFER;
796
797 goto out_free_iio_chan;
798 }
799 }
800
801 ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
802 if (ret < 0)
803 goto out_free_iio_chan;
804
805 if (!(ret & FG_DES_CAP1_VALID)) {
806 dev_err(&pdev->dev, "axp288 not configured by firmware\n");
807 ret = -ENODEV;
808 goto out_free_iio_chan;
809 }
810
811 ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
812 if (ret < 0)
813 goto out_free_iio_chan;
814 switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
815 case CHRG_CCCV_CV_4100MV:
816 info->max_volt = 4100;
817 break;
818 case CHRG_CCCV_CV_4150MV:
819 info->max_volt = 4150;
820 break;
821 case CHRG_CCCV_CV_4200MV:
822 info->max_volt = 4200;
823 break;
824 case CHRG_CCCV_CV_4350MV:
825 info->max_volt = 4350;
826 break;
827 }
828
829 psy_cfg.drv_data = info;
830 info->bat = power_supply_register(&pdev->dev, &fuel_gauge_desc, &psy_cfg);
831 if (IS_ERR(info->bat)) {
832 ret = PTR_ERR(info->bat);
833 dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
834 goto out_free_iio_chan;
835 }
836
837 fuel_gauge_create_debugfs(info);
838 fuel_gauge_init_irq(info);
839
840 return 0;
841
842 out_free_iio_chan:
843 for (i = 0; i < IIO_CHANNEL_NUM; i++)
844 if (!IS_ERR_OR_NULL(info->iio_channel[i]))
845 iio_channel_release(info->iio_channel[i]);
846
847 return ret;
848 }
849
850 static const struct platform_device_id axp288_fg_id_table[] = {
851 { .name = DEV_NAME },
852 {},
853 };
854 MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
855
axp288_fuel_gauge_remove(struct platform_device * pdev)856 static int axp288_fuel_gauge_remove(struct platform_device *pdev)
857 {
858 struct axp288_fg_info *info = platform_get_drvdata(pdev);
859 int i;
860
861 power_supply_unregister(info->bat);
862 fuel_gauge_remove_debugfs(info);
863
864 for (i = 0; i < AXP288_FG_INTR_NUM; i++)
865 if (info->irq[i] >= 0)
866 free_irq(info->irq[i], info);
867
868 for (i = 0; i < IIO_CHANNEL_NUM; i++)
869 iio_channel_release(info->iio_channel[i]);
870
871 return 0;
872 }
873
874 static struct platform_driver axp288_fuel_gauge_driver = {
875 .probe = axp288_fuel_gauge_probe,
876 .remove = axp288_fuel_gauge_remove,
877 .id_table = axp288_fg_id_table,
878 .driver = {
879 .name = DEV_NAME,
880 },
881 };
882
883 module_platform_driver(axp288_fuel_gauge_driver);
884
885 MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
886 MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
887 MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
888 MODULE_LICENSE("GPL");
889
