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2219a935 LP |
1 | /* |
2 | * TI BQ24257 charger driver | |
3 | * | |
4 | * Copyright (C) 2015 Intel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/power_supply.h> | |
21 | #include <linux/regmap.h> | |
22 | #include <linux/types.h> | |
23 | #include <linux/gpio/consumer.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/delay.h> | |
26 | ||
27 | #include <linux/acpi.h> | |
28 | #include <linux/of.h> | |
29 | ||
30 | #define BQ24257_REG_1 0x00 | |
31 | #define BQ24257_REG_2 0x01 | |
32 | #define BQ24257_REG_3 0x02 | |
33 | #define BQ24257_REG_4 0x03 | |
34 | #define BQ24257_REG_5 0x04 | |
35 | #define BQ24257_REG_6 0x05 | |
36 | #define BQ24257_REG_7 0x06 | |
37 | ||
38 | #define BQ24257_MANUFACTURER "Texas Instruments" | |
2219a935 LP |
39 | #define BQ24257_PG_GPIO "pg" |
40 | ||
41 | #define BQ24257_ILIM_SET_DELAY 1000 /* msec */ | |
42 | ||
43 | enum bq24257_fields { | |
44 | F_WD_FAULT, F_WD_EN, F_STAT, F_FAULT, /* REG 1 */ | |
45 | F_RESET, F_IILIMIT, F_EN_STAT, F_EN_TERM, F_CE, F_HZ_MODE, /* REG 2 */ | |
46 | F_VBAT, F_USB_DET, /* REG 3 */ | |
47 | F_ICHG, F_ITERM, /* REG 4 */ | |
48 | F_LOOP_STATUS, F_LOW_CHG, F_DPDM_EN, F_CE_STATUS, F_VINDPM, /* REG 5 */ | |
49 | F_X2_TMR_EN, F_TMR, F_SYSOFF, F_TS_STAT, /* REG 6 */ | |
50 | F_VOVP, F_CLR_VDP, F_FORCE_BATDET, F_FORCE_PTM, /* REG 7 */ | |
51 | ||
52 | F_MAX_FIELDS | |
53 | }; | |
54 | ||
55 | /* initial field values, converted from uV/uA */ | |
56 | struct bq24257_init_data { | |
57 | u8 ichg; /* charge current */ | |
58 | u8 vbat; /* regulation voltage */ | |
59 | u8 iterm; /* termination current */ | |
60 | }; | |
61 | ||
62 | struct bq24257_state { | |
63 | u8 status; | |
64 | u8 fault; | |
65 | bool power_good; | |
66 | }; | |
67 | ||
68 | struct bq24257_device { | |
69 | struct i2c_client *client; | |
70 | struct device *dev; | |
71 | struct power_supply *charger; | |
72 | ||
73 | struct regmap *rmap; | |
74 | struct regmap_field *rmap_fields[F_MAX_FIELDS]; | |
75 | ||
76 | struct gpio_desc *pg; | |
77 | ||
78 | struct delayed_work iilimit_setup_work; | |
79 | ||
80 | struct bq24257_init_data init_data; | |
81 | struct bq24257_state state; | |
82 | ||
83 | struct mutex lock; /* protect state data */ | |
84 | }; | |
85 | ||
86 | static bool bq24257_is_volatile_reg(struct device *dev, unsigned int reg) | |
87 | { | |
88 | switch (reg) { | |
89 | case BQ24257_REG_2: | |
90 | case BQ24257_REG_4: | |
91 | return false; | |
92 | ||
93 | default: | |
94 | return true; | |
95 | } | |
96 | } | |
97 | ||
98 | static const struct regmap_config bq24257_regmap_config = { | |
99 | .reg_bits = 8, | |
100 | .val_bits = 8, | |
101 | ||
102 | .max_register = BQ24257_REG_7, | |
103 | .cache_type = REGCACHE_RBTREE, | |
104 | ||
105 | .volatile_reg = bq24257_is_volatile_reg, | |
106 | }; | |
107 | ||
108 | static const struct reg_field bq24257_reg_fields[] = { | |
109 | /* REG 1 */ | |
110 | [F_WD_FAULT] = REG_FIELD(BQ24257_REG_1, 7, 7), | |
111 | [F_WD_EN] = REG_FIELD(BQ24257_REG_1, 6, 6), | |
112 | [F_STAT] = REG_FIELD(BQ24257_REG_1, 4, 5), | |
113 | [F_FAULT] = REG_FIELD(BQ24257_REG_1, 0, 3), | |
114 | /* REG 2 */ | |
115 | [F_RESET] = REG_FIELD(BQ24257_REG_2, 7, 7), | |
116 | [F_IILIMIT] = REG_FIELD(BQ24257_REG_2, 4, 6), | |
117 | [F_EN_STAT] = REG_FIELD(BQ24257_REG_2, 3, 3), | |
118 | [F_EN_TERM] = REG_FIELD(BQ24257_REG_2, 2, 2), | |
119 | [F_CE] = REG_FIELD(BQ24257_REG_2, 1, 1), | |
120 | [F_HZ_MODE] = REG_FIELD(BQ24257_REG_2, 0, 0), | |
121 | /* REG 3 */ | |
122 | [F_VBAT] = REG_FIELD(BQ24257_REG_3, 2, 7), | |
123 | [F_USB_DET] = REG_FIELD(BQ24257_REG_3, 0, 1), | |
124 | /* REG 4 */ | |
125 | [F_ICHG] = REG_FIELD(BQ24257_REG_4, 3, 7), | |
126 | [F_ITERM] = REG_FIELD(BQ24257_REG_4, 0, 2), | |
127 | /* REG 5 */ | |
128 | [F_LOOP_STATUS] = REG_FIELD(BQ24257_REG_5, 6, 7), | |
129 | [F_LOW_CHG] = REG_FIELD(BQ24257_REG_5, 5, 5), | |
130 | [F_DPDM_EN] = REG_FIELD(BQ24257_REG_5, 4, 4), | |
131 | [F_CE_STATUS] = REG_FIELD(BQ24257_REG_5, 3, 3), | |
132 | [F_VINDPM] = REG_FIELD(BQ24257_REG_5, 0, 2), | |
133 | /* REG 6 */ | |
134 | [F_X2_TMR_EN] = REG_FIELD(BQ24257_REG_6, 7, 7), | |
135 | [F_TMR] = REG_FIELD(BQ24257_REG_6, 5, 6), | |
136 | [F_SYSOFF] = REG_FIELD(BQ24257_REG_6, 4, 4), | |
137 | [F_TS_STAT] = REG_FIELD(BQ24257_REG_6, 0, 2), | |
138 | /* REG 7 */ | |
139 | [F_VOVP] = REG_FIELD(BQ24257_REG_7, 5, 7), | |
140 | [F_CLR_VDP] = REG_FIELD(BQ24257_REG_7, 4, 4), | |
141 | [F_FORCE_BATDET] = REG_FIELD(BQ24257_REG_7, 3, 3), | |
142 | [F_FORCE_PTM] = REG_FIELD(BQ24257_REG_7, 2, 2) | |
143 | }; | |
144 | ||
145 | static const u32 bq24257_vbat_map[] = { | |
146 | 3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000, | |
147 | 3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000, | |
148 | 3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000, | |
149 | 3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000, | |
150 | 4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000, | |
151 | 4300000, 4320000, 4340000, 4360000, 4380000, 4400000, 4420000, 4440000 | |
152 | }; | |
153 | ||
154 | #define BQ24257_VBAT_MAP_SIZE ARRAY_SIZE(bq24257_vbat_map) | |
155 | ||
156 | static const u32 bq24257_ichg_map[] = { | |
157 | 500000, 550000, 600000, 650000, 700000, 750000, 800000, 850000, 900000, | |
158 | 950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, | |
159 | 1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000, | |
160 | 1750000, 1800000, 1850000, 1900000, 1950000, 2000000 | |
161 | }; | |
162 | ||
163 | #define BQ24257_ICHG_MAP_SIZE ARRAY_SIZE(bq24257_ichg_map) | |
164 | ||
165 | static const u32 bq24257_iterm_map[] = { | |
166 | 50000, 75000, 100000, 125000, 150000, 175000, 200000, 225000 | |
167 | }; | |
168 | ||
169 | #define BQ24257_ITERM_MAP_SIZE ARRAY_SIZE(bq24257_iterm_map) | |
170 | ||
171 | static int bq24257_field_read(struct bq24257_device *bq, | |
172 | enum bq24257_fields field_id) | |
173 | { | |
174 | int ret; | |
175 | int val; | |
176 | ||
177 | ret = regmap_field_read(bq->rmap_fields[field_id], &val); | |
178 | if (ret < 0) | |
179 | return ret; | |
180 | ||
181 | return val; | |
182 | } | |
183 | ||
184 | static int bq24257_field_write(struct bq24257_device *bq, | |
185 | enum bq24257_fields field_id, u8 val) | |
186 | { | |
187 | return regmap_field_write(bq->rmap_fields[field_id], val); | |
188 | } | |
189 | ||
190 | static u8 bq24257_find_idx(u32 value, const u32 *map, u8 map_size) | |
191 | { | |
192 | u8 idx; | |
193 | ||
194 | for (idx = 1; idx < map_size; idx++) | |
195 | if (value < map[idx]) | |
196 | break; | |
197 | ||
198 | return idx - 1; | |
199 | } | |
200 | ||
201 | enum bq24257_status { | |
202 | STATUS_READY, | |
203 | STATUS_CHARGE_IN_PROGRESS, | |
204 | STATUS_CHARGE_DONE, | |
205 | STATUS_FAULT, | |
206 | }; | |
207 | ||
208 | enum bq24257_fault { | |
209 | FAULT_NORMAL, | |
210 | FAULT_INPUT_OVP, | |
211 | FAULT_INPUT_UVLO, | |
212 | FAULT_SLEEP, | |
213 | FAULT_BAT_TS, | |
214 | FAULT_BAT_OVP, | |
215 | FAULT_TS, | |
216 | FAULT_TIMER, | |
217 | FAULT_NO_BAT, | |
218 | FAULT_ISET, | |
219 | FAULT_INPUT_LDO_LOW, | |
220 | }; | |
221 | ||
222 | static int bq24257_power_supply_get_property(struct power_supply *psy, | |
223 | enum power_supply_property psp, | |
224 | union power_supply_propval *val) | |
225 | { | |
226 | struct bq24257_device *bq = power_supply_get_drvdata(psy); | |
227 | struct bq24257_state state; | |
228 | ||
229 | mutex_lock(&bq->lock); | |
230 | state = bq->state; | |
231 | mutex_unlock(&bq->lock); | |
232 | ||
233 | switch (psp) { | |
234 | case POWER_SUPPLY_PROP_STATUS: | |
235 | if (!state.power_good) | |
236 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
237 | else if (state.status == STATUS_READY) | |
238 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
239 | else if (state.status == STATUS_CHARGE_IN_PROGRESS) | |
240 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
241 | else if (state.status == STATUS_CHARGE_DONE) | |
242 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
243 | else | |
244 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
245 | break; | |
246 | ||
247 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
248 | val->strval = BQ24257_MANUFACTURER; | |
249 | break; | |
250 | ||
251 | case POWER_SUPPLY_PROP_ONLINE: | |
252 | val->intval = state.power_good; | |
253 | break; | |
254 | ||
255 | case POWER_SUPPLY_PROP_HEALTH: | |
256 | switch (state.fault) { | |
257 | case FAULT_NORMAL: | |
258 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
259 | break; | |
260 | ||
261 | case FAULT_INPUT_OVP: | |
262 | case FAULT_BAT_OVP: | |
263 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
264 | break; | |
265 | ||
266 | case FAULT_TS: | |
267 | case FAULT_BAT_TS: | |
268 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
269 | break; | |
270 | ||
271 | case FAULT_TIMER: | |
272 | val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; | |
273 | break; | |
274 | ||
275 | default: | |
276 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
277 | break; | |
278 | } | |
279 | ||
280 | break; | |
281 | ||
282 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: | |
283 | val->intval = bq24257_ichg_map[bq->init_data.ichg]; | |
284 | break; | |
285 | ||
286 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: | |
287 | val->intval = bq24257_ichg_map[BQ24257_ICHG_MAP_SIZE - 1]; | |
288 | break; | |
289 | ||
290 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: | |
291 | val->intval = bq24257_vbat_map[bq->init_data.vbat]; | |
292 | break; | |
293 | ||
294 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: | |
295 | val->intval = bq24257_vbat_map[BQ24257_VBAT_MAP_SIZE - 1]; | |
296 | break; | |
297 | ||
298 | case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: | |
299 | val->intval = bq24257_iterm_map[bq->init_data.iterm]; | |
300 | break; | |
301 | ||
302 | default: | |
303 | return -EINVAL; | |
304 | } | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static int bq24257_get_chip_state(struct bq24257_device *bq, | |
310 | struct bq24257_state *state) | |
311 | { | |
312 | int ret; | |
313 | ||
314 | ret = bq24257_field_read(bq, F_STAT); | |
315 | if (ret < 0) | |
316 | return ret; | |
317 | ||
318 | state->status = ret; | |
319 | ||
320 | ret = bq24257_field_read(bq, F_FAULT); | |
321 | if (ret < 0) | |
322 | return ret; | |
323 | ||
324 | state->fault = ret; | |
325 | ||
326 | state->power_good = !gpiod_get_value_cansleep(bq->pg); | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
331 | static bool bq24257_state_changed(struct bq24257_device *bq, | |
332 | struct bq24257_state *new_state) | |
333 | { | |
334 | int ret; | |
335 | ||
336 | mutex_lock(&bq->lock); | |
337 | ret = (bq->state.status != new_state->status || | |
338 | bq->state.fault != new_state->fault || | |
339 | bq->state.power_good != new_state->power_good); | |
340 | mutex_unlock(&bq->lock); | |
341 | ||
342 | return ret; | |
343 | } | |
344 | ||
345 | enum bq24257_loop_status { | |
346 | LOOP_STATUS_NONE, | |
347 | LOOP_STATUS_IN_DPM, | |
348 | LOOP_STATUS_IN_CURRENT_LIMIT, | |
349 | LOOP_STATUS_THERMAL, | |
350 | }; | |
351 | ||
352 | enum bq24257_in_ilimit { | |
353 | IILIMIT_100, | |
354 | IILIMIT_150, | |
355 | IILIMIT_500, | |
356 | IILIMIT_900, | |
357 | IILIMIT_1500, | |
358 | IILIMIT_2000, | |
359 | IILIMIT_EXT, | |
360 | IILIMIT_NONE, | |
361 | }; | |
362 | ||
363 | enum bq24257_port_type { | |
364 | PORT_TYPE_DCP, /* Dedicated Charging Port */ | |
365 | PORT_TYPE_CDP, /* Charging Downstream Port */ | |
366 | PORT_TYPE_SDP, /* Standard Downstream Port */ | |
367 | PORT_TYPE_NON_STANDARD, | |
368 | }; | |
369 | ||
370 | enum bq24257_safety_timer { | |
371 | SAFETY_TIMER_45, | |
372 | SAFETY_TIMER_360, | |
373 | SAFETY_TIMER_540, | |
374 | SAFETY_TIMER_NONE, | |
375 | }; | |
376 | ||
377 | static int bq24257_iilimit_autoset(struct bq24257_device *bq) | |
378 | { | |
379 | int loop_status; | |
380 | int iilimit; | |
381 | int port_type; | |
382 | int ret; | |
383 | const u8 new_iilimit[] = { | |
384 | [PORT_TYPE_DCP] = IILIMIT_2000, | |
385 | [PORT_TYPE_CDP] = IILIMIT_2000, | |
386 | [PORT_TYPE_SDP] = IILIMIT_500, | |
387 | [PORT_TYPE_NON_STANDARD] = IILIMIT_500 | |
388 | }; | |
389 | ||
390 | ret = bq24257_field_read(bq, F_LOOP_STATUS); | |
391 | if (ret < 0) | |
392 | goto error; | |
393 | ||
394 | loop_status = ret; | |
395 | ||
396 | ret = bq24257_field_read(bq, F_IILIMIT); | |
397 | if (ret < 0) | |
398 | goto error; | |
399 | ||
400 | iilimit = ret; | |
401 | ||
402 | /* | |
403 | * All USB ports should be able to handle 500mA. If not, DPM will lower | |
404 | * the charging current to accommodate the power source. No need to set | |
405 | * a lower IILIMIT value. | |
406 | */ | |
407 | if (loop_status == LOOP_STATUS_IN_DPM && iilimit == IILIMIT_500) | |
408 | return 0; | |
409 | ||
410 | ret = bq24257_field_read(bq, F_USB_DET); | |
411 | if (ret < 0) | |
412 | goto error; | |
413 | ||
414 | port_type = ret; | |
415 | ||
416 | ret = bq24257_field_write(bq, F_IILIMIT, new_iilimit[port_type]); | |
417 | if (ret < 0) | |
418 | goto error; | |
419 | ||
420 | ret = bq24257_field_write(bq, F_TMR, SAFETY_TIMER_360); | |
421 | if (ret < 0) | |
422 | goto error; | |
423 | ||
424 | ret = bq24257_field_write(bq, F_CLR_VDP, 1); | |
425 | if (ret < 0) | |
426 | goto error; | |
427 | ||
428 | dev_dbg(bq->dev, "port/loop = %d/%d -> iilimit = %d\n", | |
429 | port_type, loop_status, new_iilimit[port_type]); | |
430 | ||
431 | return 0; | |
432 | ||
433 | error: | |
434 | dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); | |
435 | return ret; | |
436 | } | |
437 | ||
438 | static void bq24257_iilimit_setup_work(struct work_struct *work) | |
439 | { | |
440 | struct bq24257_device *bq = container_of(work, struct bq24257_device, | |
441 | iilimit_setup_work.work); | |
442 | ||
443 | bq24257_iilimit_autoset(bq); | |
444 | } | |
445 | ||
446 | static void bq24257_handle_state_change(struct bq24257_device *bq, | |
447 | struct bq24257_state *new_state) | |
448 | { | |
449 | int ret; | |
450 | struct bq24257_state old_state; | |
2219a935 LP |
451 | |
452 | mutex_lock(&bq->lock); | |
453 | old_state = bq->state; | |
454 | mutex_unlock(&bq->lock); | |
455 | ||
9b1cf1e4 AD |
456 | if (!new_state->power_good) { |
457 | dev_dbg(bq->dev, "Power removed\n"); | |
2219a935 LP |
458 | cancel_delayed_work_sync(&bq->iilimit_setup_work); |
459 | ||
460 | /* activate D+/D- port detection algorithm */ | |
461 | ret = bq24257_field_write(bq, F_DPDM_EN, 1); | |
462 | if (ret < 0) | |
463 | goto error; | |
464 | ||
9b1cf1e4 | 465 | /* reset input current limit */ |
2219a935 LP |
466 | ret = bq24257_field_write(bq, F_IILIMIT, IILIMIT_500); |
467 | if (ret < 0) | |
468 | goto error; | |
9b1cf1e4 AD |
469 | } else if (!old_state.power_good) { |
470 | dev_dbg(bq->dev, "Power inserted\n"); | |
471 | ||
472 | /* configure input current limit */ | |
2219a935 LP |
473 | schedule_delayed_work(&bq->iilimit_setup_work, |
474 | msecs_to_jiffies(BQ24257_ILIM_SET_DELAY)); | |
9b1cf1e4 AD |
475 | } else if (new_state->fault == FAULT_NO_BAT) { |
476 | dev_warn(bq->dev, "Battery removed\n"); | |
477 | } else if (new_state->fault == FAULT_TIMER) { | |
478 | dev_err(bq->dev, "Safety timer expired! Battery dead?\n"); | |
2219a935 LP |
479 | } |
480 | ||
481 | return; | |
482 | ||
483 | error: | |
484 | dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); | |
485 | } | |
486 | ||
487 | static irqreturn_t bq24257_irq_handler_thread(int irq, void *private) | |
488 | { | |
489 | int ret; | |
490 | struct bq24257_device *bq = private; | |
491 | struct bq24257_state state; | |
492 | ||
493 | ret = bq24257_get_chip_state(bq, &state); | |
494 | if (ret < 0) | |
495 | return IRQ_HANDLED; | |
496 | ||
497 | if (!bq24257_state_changed(bq, &state)) | |
498 | return IRQ_HANDLED; | |
499 | ||
500 | dev_dbg(bq->dev, "irq(state changed): status/fault/pg = %d/%d/%d\n", | |
501 | state.status, state.fault, state.power_good); | |
502 | ||
503 | bq24257_handle_state_change(bq, &state); | |
504 | ||
505 | mutex_lock(&bq->lock); | |
506 | bq->state = state; | |
507 | mutex_unlock(&bq->lock); | |
508 | ||
509 | power_supply_changed(bq->charger); | |
510 | ||
511 | return IRQ_HANDLED; | |
512 | } | |
513 | ||
514 | static int bq24257_hw_init(struct bq24257_device *bq) | |
515 | { | |
516 | int ret; | |
517 | int i; | |
518 | struct bq24257_state state; | |
519 | ||
520 | const struct { | |
521 | int field; | |
522 | u32 value; | |
523 | } init_data[] = { | |
524 | {F_ICHG, bq->init_data.ichg}, | |
525 | {F_VBAT, bq->init_data.vbat}, | |
526 | {F_ITERM, bq->init_data.iterm} | |
527 | }; | |
528 | ||
529 | /* | |
530 | * Disable the watchdog timer to prevent the IC from going back to | |
531 | * default settings after 50 seconds of I2C inactivity. | |
532 | */ | |
533 | ret = bq24257_field_write(bq, F_WD_EN, 0); | |
534 | if (ret < 0) | |
535 | return ret; | |
536 | ||
537 | /* configure the charge currents and voltages */ | |
538 | for (i = 0; i < ARRAY_SIZE(init_data); i++) { | |
539 | ret = bq24257_field_write(bq, init_data[i].field, | |
540 | init_data[i].value); | |
541 | if (ret < 0) | |
542 | return ret; | |
543 | } | |
544 | ||
545 | ret = bq24257_get_chip_state(bq, &state); | |
546 | if (ret < 0) | |
547 | return ret; | |
548 | ||
549 | mutex_lock(&bq->lock); | |
550 | bq->state = state; | |
551 | mutex_unlock(&bq->lock); | |
552 | ||
553 | if (!state.power_good) | |
554 | /* activate D+/D- detection algorithm */ | |
555 | ret = bq24257_field_write(bq, F_DPDM_EN, 1); | |
556 | else if (state.fault != FAULT_NO_BAT) | |
557 | ret = bq24257_iilimit_autoset(bq); | |
558 | ||
559 | return ret; | |
560 | } | |
561 | ||
562 | static enum power_supply_property bq24257_power_supply_props[] = { | |
563 | POWER_SUPPLY_PROP_MANUFACTURER, | |
564 | POWER_SUPPLY_PROP_STATUS, | |
565 | POWER_SUPPLY_PROP_ONLINE, | |
566 | POWER_SUPPLY_PROP_HEALTH, | |
567 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, | |
568 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, | |
569 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, | |
570 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, | |
571 | POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, | |
572 | }; | |
573 | ||
574 | static char *bq24257_charger_supplied_to[] = { | |
575 | "main-battery", | |
576 | }; | |
577 | ||
578 | static const struct power_supply_desc bq24257_power_supply_desc = { | |
579 | .name = "bq24257-charger", | |
580 | .type = POWER_SUPPLY_TYPE_USB, | |
581 | .properties = bq24257_power_supply_props, | |
582 | .num_properties = ARRAY_SIZE(bq24257_power_supply_props), | |
583 | .get_property = bq24257_power_supply_get_property, | |
584 | }; | |
585 | ||
586 | static int bq24257_power_supply_init(struct bq24257_device *bq) | |
587 | { | |
588 | struct power_supply_config psy_cfg = { .drv_data = bq, }; | |
589 | ||
590 | psy_cfg.supplied_to = bq24257_charger_supplied_to; | |
591 | psy_cfg.num_supplicants = ARRAY_SIZE(bq24257_charger_supplied_to); | |
592 | ||
593 | bq->charger = power_supply_register(bq->dev, &bq24257_power_supply_desc, | |
594 | &psy_cfg); | |
595 | if (IS_ERR(bq->charger)) | |
596 | return PTR_ERR(bq->charger); | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
2219a935 LP |
601 | static int bq24257_pg_gpio_probe(struct bq24257_device *bq) |
602 | { | |
e31cd782 | 603 | bq->pg = devm_gpiod_get_index(bq->dev, BQ24257_PG_GPIO, 0, GPIOD_IN); |
2219a935 LP |
604 | if (IS_ERR(bq->pg)) { |
605 | dev_err(bq->dev, "could not probe PG pin\n"); | |
606 | return PTR_ERR(bq->pg); | |
607 | } | |
608 | ||
e31cd782 | 609 | return 0; |
2219a935 LP |
610 | } |
611 | ||
612 | static int bq24257_fw_probe(struct bq24257_device *bq) | |
613 | { | |
614 | int ret; | |
615 | u32 property; | |
616 | ||
617 | ret = device_property_read_u32(bq->dev, "ti,charge-current", &property); | |
618 | if (ret < 0) | |
619 | return ret; | |
620 | ||
621 | bq->init_data.ichg = bq24257_find_idx(property, bq24257_ichg_map, | |
622 | BQ24257_ICHG_MAP_SIZE); | |
623 | ||
624 | ret = device_property_read_u32(bq->dev, "ti,battery-regulation-voltage", | |
625 | &property); | |
626 | if (ret < 0) | |
627 | return ret; | |
628 | ||
629 | bq->init_data.vbat = bq24257_find_idx(property, bq24257_vbat_map, | |
630 | BQ24257_VBAT_MAP_SIZE); | |
631 | ||
632 | ret = device_property_read_u32(bq->dev, "ti,termination-current", | |
633 | &property); | |
634 | if (ret < 0) | |
635 | return ret; | |
636 | ||
637 | bq->init_data.iterm = bq24257_find_idx(property, bq24257_iterm_map, | |
638 | BQ24257_ITERM_MAP_SIZE); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static int bq24257_probe(struct i2c_client *client, | |
644 | const struct i2c_device_id *id) | |
645 | { | |
646 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
647 | struct device *dev = &client->dev; | |
648 | struct bq24257_device *bq; | |
649 | int ret; | |
650 | int i; | |
651 | ||
652 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
653 | dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); | |
654 | return -ENODEV; | |
655 | } | |
656 | ||
657 | bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); | |
658 | if (!bq) | |
659 | return -ENOMEM; | |
660 | ||
661 | bq->client = client; | |
662 | bq->dev = dev; | |
663 | ||
664 | mutex_init(&bq->lock); | |
665 | ||
666 | bq->rmap = devm_regmap_init_i2c(client, &bq24257_regmap_config); | |
667 | if (IS_ERR(bq->rmap)) { | |
668 | dev_err(dev, "failed to allocate register map\n"); | |
669 | return PTR_ERR(bq->rmap); | |
670 | } | |
671 | ||
672 | for (i = 0; i < ARRAY_SIZE(bq24257_reg_fields); i++) { | |
673 | const struct reg_field *reg_fields = bq24257_reg_fields; | |
674 | ||
675 | bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, | |
676 | reg_fields[i]); | |
677 | if (IS_ERR(bq->rmap_fields[i])) { | |
678 | dev_err(dev, "cannot allocate regmap field\n"); | |
679 | return PTR_ERR(bq->rmap_fields[i]); | |
680 | } | |
681 | } | |
682 | ||
683 | i2c_set_clientdata(client, bq); | |
684 | ||
685 | INIT_DELAYED_WORK(&bq->iilimit_setup_work, bq24257_iilimit_setup_work); | |
686 | ||
687 | if (!dev->platform_data) { | |
688 | ret = bq24257_fw_probe(bq); | |
689 | if (ret < 0) { | |
690 | dev_err(dev, "Cannot read device properties.\n"); | |
691 | return ret; | |
692 | } | |
693 | } else { | |
694 | return -ENODEV; | |
695 | } | |
696 | ||
697 | /* we can only check Power Good status by probing the PG pin */ | |
698 | ret = bq24257_pg_gpio_probe(bq); | |
699 | if (ret < 0) | |
700 | return ret; | |
701 | ||
702 | /* reset all registers to defaults */ | |
703 | ret = bq24257_field_write(bq, F_RESET, 1); | |
704 | if (ret < 0) | |
705 | return ret; | |
706 | ||
707 | /* | |
708 | * Put the RESET bit back to 0, in cache. For some reason the HW always | |
709 | * returns 1 on this bit, so this is the only way to avoid resetting the | |
710 | * chip every time we update another field in this register. | |
711 | */ | |
712 | ret = bq24257_field_write(bq, F_RESET, 0); | |
713 | if (ret < 0) | |
714 | return ret; | |
715 | ||
716 | ret = bq24257_hw_init(bq); | |
717 | if (ret < 0) { | |
718 | dev_err(dev, "Cannot initialize the chip.\n"); | |
719 | return ret; | |
720 | } | |
721 | ||
2219a935 LP |
722 | ret = devm_request_threaded_irq(dev, client->irq, NULL, |
723 | bq24257_irq_handler_thread, | |
724 | IRQF_TRIGGER_FALLING | | |
725 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
5ff8c89d AD |
726 | "bq24257", bq); |
727 | if (ret) { | |
728 | dev_err(dev, "Failed to request IRQ #%d\n", client->irq); | |
2219a935 | 729 | return ret; |
5ff8c89d | 730 | } |
2219a935 LP |
731 | |
732 | ret = bq24257_power_supply_init(bq); | |
733 | if (ret < 0) | |
734 | dev_err(dev, "Failed to register power supply\n"); | |
735 | ||
736 | return ret; | |
737 | } | |
738 | ||
739 | static int bq24257_remove(struct i2c_client *client) | |
740 | { | |
741 | struct bq24257_device *bq = i2c_get_clientdata(client); | |
742 | ||
743 | cancel_delayed_work_sync(&bq->iilimit_setup_work); | |
744 | ||
745 | power_supply_unregister(bq->charger); | |
746 | ||
747 | bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */ | |
748 | ||
749 | return 0; | |
750 | } | |
751 | ||
752 | #ifdef CONFIG_PM_SLEEP | |
753 | static int bq24257_suspend(struct device *dev) | |
754 | { | |
755 | struct bq24257_device *bq = dev_get_drvdata(dev); | |
756 | int ret = 0; | |
757 | ||
758 | cancel_delayed_work_sync(&bq->iilimit_setup_work); | |
759 | ||
760 | /* reset all registers to default (and activate standalone mode) */ | |
761 | ret = bq24257_field_write(bq, F_RESET, 1); | |
762 | if (ret < 0) | |
763 | dev_err(bq->dev, "Cannot reset chip to standalone mode.\n"); | |
764 | ||
765 | return ret; | |
766 | } | |
767 | ||
768 | static int bq24257_resume(struct device *dev) | |
769 | { | |
770 | int ret; | |
771 | struct bq24257_device *bq = dev_get_drvdata(dev); | |
772 | ||
773 | ret = regcache_drop_region(bq->rmap, BQ24257_REG_1, BQ24257_REG_7); | |
774 | if (ret < 0) | |
775 | return ret; | |
776 | ||
777 | ret = bq24257_field_write(bq, F_RESET, 0); | |
778 | if (ret < 0) | |
779 | return ret; | |
780 | ||
781 | ret = bq24257_hw_init(bq); | |
782 | if (ret < 0) { | |
783 | dev_err(bq->dev, "Cannot init chip after resume.\n"); | |
784 | return ret; | |
785 | } | |
786 | ||
787 | /* signal userspace, maybe state changed while suspended */ | |
788 | power_supply_changed(bq->charger); | |
789 | ||
790 | return 0; | |
791 | } | |
792 | #endif | |
793 | ||
794 | static const struct dev_pm_ops bq24257_pm = { | |
795 | SET_SYSTEM_SLEEP_PM_OPS(bq24257_suspend, bq24257_resume) | |
796 | }; | |
797 | ||
798 | static const struct i2c_device_id bq24257_i2c_ids[] = { | |
799 | { "bq24257", 0 }, | |
800 | {}, | |
801 | }; | |
802 | MODULE_DEVICE_TABLE(i2c, bq24257_i2c_ids); | |
803 | ||
804 | static const struct of_device_id bq24257_of_match[] = { | |
805 | { .compatible = "ti,bq24257", }, | |
806 | { }, | |
807 | }; | |
808 | MODULE_DEVICE_TABLE(of, bq24257_of_match); | |
809 | ||
810 | static const struct acpi_device_id bq24257_acpi_match[] = { | |
811 | {"BQ242570", 0}, | |
812 | {}, | |
813 | }; | |
814 | MODULE_DEVICE_TABLE(acpi, bq24257_acpi_match); | |
815 | ||
816 | static struct i2c_driver bq24257_driver = { | |
817 | .driver = { | |
818 | .name = "bq24257-charger", | |
819 | .of_match_table = of_match_ptr(bq24257_of_match), | |
820 | .acpi_match_table = ACPI_PTR(bq24257_acpi_match), | |
821 | .pm = &bq24257_pm, | |
822 | }, | |
823 | .probe = bq24257_probe, | |
824 | .remove = bq24257_remove, | |
825 | .id_table = bq24257_i2c_ids, | |
826 | }; | |
827 | module_i2c_driver(bq24257_driver); | |
828 | ||
829 | MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); | |
830 | MODULE_DESCRIPTION("bq24257 charger driver"); | |
831 | MODULE_LICENSE("GPL"); |