Commit | Line | Data |
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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" | |
39 | #define BQ24257_STAT_IRQ "stat" | |
40 | #define BQ24257_PG_GPIO "pg" | |
41 | ||
42 | #define BQ24257_ILIM_SET_DELAY 1000 /* msec */ | |
43 | ||
44 | enum bq24257_fields { | |
45 | F_WD_FAULT, F_WD_EN, F_STAT, F_FAULT, /* REG 1 */ | |
46 | F_RESET, F_IILIMIT, F_EN_STAT, F_EN_TERM, F_CE, F_HZ_MODE, /* REG 2 */ | |
47 | F_VBAT, F_USB_DET, /* REG 3 */ | |
48 | F_ICHG, F_ITERM, /* REG 4 */ | |
49 | F_LOOP_STATUS, F_LOW_CHG, F_DPDM_EN, F_CE_STATUS, F_VINDPM, /* REG 5 */ | |
50 | F_X2_TMR_EN, F_TMR, F_SYSOFF, F_TS_STAT, /* REG 6 */ | |
51 | F_VOVP, F_CLR_VDP, F_FORCE_BATDET, F_FORCE_PTM, /* REG 7 */ | |
52 | ||
53 | F_MAX_FIELDS | |
54 | }; | |
55 | ||
56 | /* initial field values, converted from uV/uA */ | |
57 | struct bq24257_init_data { | |
58 | u8 ichg; /* charge current */ | |
59 | u8 vbat; /* regulation voltage */ | |
60 | u8 iterm; /* termination current */ | |
61 | }; | |
62 | ||
63 | struct bq24257_state { | |
64 | u8 status; | |
65 | u8 fault; | |
66 | bool power_good; | |
67 | }; | |
68 | ||
69 | struct bq24257_device { | |
70 | struct i2c_client *client; | |
71 | struct device *dev; | |
72 | struct power_supply *charger; | |
73 | ||
74 | struct regmap *rmap; | |
75 | struct regmap_field *rmap_fields[F_MAX_FIELDS]; | |
76 | ||
77 | struct gpio_desc *pg; | |
78 | ||
79 | struct delayed_work iilimit_setup_work; | |
80 | ||
81 | struct bq24257_init_data init_data; | |
82 | struct bq24257_state state; | |
83 | ||
84 | struct mutex lock; /* protect state data */ | |
85 | }; | |
86 | ||
87 | static bool bq24257_is_volatile_reg(struct device *dev, unsigned int reg) | |
88 | { | |
89 | switch (reg) { | |
90 | case BQ24257_REG_2: | |
91 | case BQ24257_REG_4: | |
92 | return false; | |
93 | ||
94 | default: | |
95 | return true; | |
96 | } | |
97 | } | |
98 | ||
99 | static const struct regmap_config bq24257_regmap_config = { | |
100 | .reg_bits = 8, | |
101 | .val_bits = 8, | |
102 | ||
103 | .max_register = BQ24257_REG_7, | |
104 | .cache_type = REGCACHE_RBTREE, | |
105 | ||
106 | .volatile_reg = bq24257_is_volatile_reg, | |
107 | }; | |
108 | ||
109 | static const struct reg_field bq24257_reg_fields[] = { | |
110 | /* REG 1 */ | |
111 | [F_WD_FAULT] = REG_FIELD(BQ24257_REG_1, 7, 7), | |
112 | [F_WD_EN] = REG_FIELD(BQ24257_REG_1, 6, 6), | |
113 | [F_STAT] = REG_FIELD(BQ24257_REG_1, 4, 5), | |
114 | [F_FAULT] = REG_FIELD(BQ24257_REG_1, 0, 3), | |
115 | /* REG 2 */ | |
116 | [F_RESET] = REG_FIELD(BQ24257_REG_2, 7, 7), | |
117 | [F_IILIMIT] = REG_FIELD(BQ24257_REG_2, 4, 6), | |
118 | [F_EN_STAT] = REG_FIELD(BQ24257_REG_2, 3, 3), | |
119 | [F_EN_TERM] = REG_FIELD(BQ24257_REG_2, 2, 2), | |
120 | [F_CE] = REG_FIELD(BQ24257_REG_2, 1, 1), | |
121 | [F_HZ_MODE] = REG_FIELD(BQ24257_REG_2, 0, 0), | |
122 | /* REG 3 */ | |
123 | [F_VBAT] = REG_FIELD(BQ24257_REG_3, 2, 7), | |
124 | [F_USB_DET] = REG_FIELD(BQ24257_REG_3, 0, 1), | |
125 | /* REG 4 */ | |
126 | [F_ICHG] = REG_FIELD(BQ24257_REG_4, 3, 7), | |
127 | [F_ITERM] = REG_FIELD(BQ24257_REG_4, 0, 2), | |
128 | /* REG 5 */ | |
129 | [F_LOOP_STATUS] = REG_FIELD(BQ24257_REG_5, 6, 7), | |
130 | [F_LOW_CHG] = REG_FIELD(BQ24257_REG_5, 5, 5), | |
131 | [F_DPDM_EN] = REG_FIELD(BQ24257_REG_5, 4, 4), | |
132 | [F_CE_STATUS] = REG_FIELD(BQ24257_REG_5, 3, 3), | |
133 | [F_VINDPM] = REG_FIELD(BQ24257_REG_5, 0, 2), | |
134 | /* REG 6 */ | |
135 | [F_X2_TMR_EN] = REG_FIELD(BQ24257_REG_6, 7, 7), | |
136 | [F_TMR] = REG_FIELD(BQ24257_REG_6, 5, 6), | |
137 | [F_SYSOFF] = REG_FIELD(BQ24257_REG_6, 4, 4), | |
138 | [F_TS_STAT] = REG_FIELD(BQ24257_REG_6, 0, 2), | |
139 | /* REG 7 */ | |
140 | [F_VOVP] = REG_FIELD(BQ24257_REG_7, 5, 7), | |
141 | [F_CLR_VDP] = REG_FIELD(BQ24257_REG_7, 4, 4), | |
142 | [F_FORCE_BATDET] = REG_FIELD(BQ24257_REG_7, 3, 3), | |
143 | [F_FORCE_PTM] = REG_FIELD(BQ24257_REG_7, 2, 2) | |
144 | }; | |
145 | ||
146 | static const u32 bq24257_vbat_map[] = { | |
147 | 3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000, | |
148 | 3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000, | |
149 | 3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000, | |
150 | 3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000, | |
151 | 4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000, | |
152 | 4300000, 4320000, 4340000, 4360000, 4380000, 4400000, 4420000, 4440000 | |
153 | }; | |
154 | ||
155 | #define BQ24257_VBAT_MAP_SIZE ARRAY_SIZE(bq24257_vbat_map) | |
156 | ||
157 | static const u32 bq24257_ichg_map[] = { | |
158 | 500000, 550000, 600000, 650000, 700000, 750000, 800000, 850000, 900000, | |
159 | 950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, | |
160 | 1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000, | |
161 | 1750000, 1800000, 1850000, 1900000, 1950000, 2000000 | |
162 | }; | |
163 | ||
164 | #define BQ24257_ICHG_MAP_SIZE ARRAY_SIZE(bq24257_ichg_map) | |
165 | ||
166 | static const u32 bq24257_iterm_map[] = { | |
167 | 50000, 75000, 100000, 125000, 150000, 175000, 200000, 225000 | |
168 | }; | |
169 | ||
170 | #define BQ24257_ITERM_MAP_SIZE ARRAY_SIZE(bq24257_iterm_map) | |
171 | ||
172 | static int bq24257_field_read(struct bq24257_device *bq, | |
173 | enum bq24257_fields field_id) | |
174 | { | |
175 | int ret; | |
176 | int val; | |
177 | ||
178 | ret = regmap_field_read(bq->rmap_fields[field_id], &val); | |
179 | if (ret < 0) | |
180 | return ret; | |
181 | ||
182 | return val; | |
183 | } | |
184 | ||
185 | static int bq24257_field_write(struct bq24257_device *bq, | |
186 | enum bq24257_fields field_id, u8 val) | |
187 | { | |
188 | return regmap_field_write(bq->rmap_fields[field_id], val); | |
189 | } | |
190 | ||
191 | static u8 bq24257_find_idx(u32 value, const u32 *map, u8 map_size) | |
192 | { | |
193 | u8 idx; | |
194 | ||
195 | for (idx = 1; idx < map_size; idx++) | |
196 | if (value < map[idx]) | |
197 | break; | |
198 | ||
199 | return idx - 1; | |
200 | } | |
201 | ||
202 | enum bq24257_status { | |
203 | STATUS_READY, | |
204 | STATUS_CHARGE_IN_PROGRESS, | |
205 | STATUS_CHARGE_DONE, | |
206 | STATUS_FAULT, | |
207 | }; | |
208 | ||
209 | enum bq24257_fault { | |
210 | FAULT_NORMAL, | |
211 | FAULT_INPUT_OVP, | |
212 | FAULT_INPUT_UVLO, | |
213 | FAULT_SLEEP, | |
214 | FAULT_BAT_TS, | |
215 | FAULT_BAT_OVP, | |
216 | FAULT_TS, | |
217 | FAULT_TIMER, | |
218 | FAULT_NO_BAT, | |
219 | FAULT_ISET, | |
220 | FAULT_INPUT_LDO_LOW, | |
221 | }; | |
222 | ||
223 | static int bq24257_power_supply_get_property(struct power_supply *psy, | |
224 | enum power_supply_property psp, | |
225 | union power_supply_propval *val) | |
226 | { | |
227 | struct bq24257_device *bq = power_supply_get_drvdata(psy); | |
228 | struct bq24257_state state; | |
229 | ||
230 | mutex_lock(&bq->lock); | |
231 | state = bq->state; | |
232 | mutex_unlock(&bq->lock); | |
233 | ||
234 | switch (psp) { | |
235 | case POWER_SUPPLY_PROP_STATUS: | |
236 | if (!state.power_good) | |
237 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
238 | else if (state.status == STATUS_READY) | |
239 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
240 | else if (state.status == STATUS_CHARGE_IN_PROGRESS) | |
241 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
242 | else if (state.status == STATUS_CHARGE_DONE) | |
243 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
244 | else | |
245 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
246 | break; | |
247 | ||
248 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
249 | val->strval = BQ24257_MANUFACTURER; | |
250 | break; | |
251 | ||
252 | case POWER_SUPPLY_PROP_ONLINE: | |
253 | val->intval = state.power_good; | |
254 | break; | |
255 | ||
256 | case POWER_SUPPLY_PROP_HEALTH: | |
257 | switch (state.fault) { | |
258 | case FAULT_NORMAL: | |
259 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
260 | break; | |
261 | ||
262 | case FAULT_INPUT_OVP: | |
263 | case FAULT_BAT_OVP: | |
264 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
265 | break; | |
266 | ||
267 | case FAULT_TS: | |
268 | case FAULT_BAT_TS: | |
269 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
270 | break; | |
271 | ||
272 | case FAULT_TIMER: | |
273 | val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; | |
274 | break; | |
275 | ||
276 | default: | |
277 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
278 | break; | |
279 | } | |
280 | ||
281 | break; | |
282 | ||
283 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: | |
284 | val->intval = bq24257_ichg_map[bq->init_data.ichg]; | |
285 | break; | |
286 | ||
287 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: | |
288 | val->intval = bq24257_ichg_map[BQ24257_ICHG_MAP_SIZE - 1]; | |
289 | break; | |
290 | ||
291 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: | |
292 | val->intval = bq24257_vbat_map[bq->init_data.vbat]; | |
293 | break; | |
294 | ||
295 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: | |
296 | val->intval = bq24257_vbat_map[BQ24257_VBAT_MAP_SIZE - 1]; | |
297 | break; | |
298 | ||
299 | case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: | |
300 | val->intval = bq24257_iterm_map[bq->init_data.iterm]; | |
301 | break; | |
302 | ||
303 | default: | |
304 | return -EINVAL; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | static int bq24257_get_chip_state(struct bq24257_device *bq, | |
311 | struct bq24257_state *state) | |
312 | { | |
313 | int ret; | |
314 | ||
315 | ret = bq24257_field_read(bq, F_STAT); | |
316 | if (ret < 0) | |
317 | return ret; | |
318 | ||
319 | state->status = ret; | |
320 | ||
321 | ret = bq24257_field_read(bq, F_FAULT); | |
322 | if (ret < 0) | |
323 | return ret; | |
324 | ||
325 | state->fault = ret; | |
326 | ||
327 | state->power_good = !gpiod_get_value_cansleep(bq->pg); | |
328 | ||
329 | return 0; | |
330 | } | |
331 | ||
332 | static bool bq24257_state_changed(struct bq24257_device *bq, | |
333 | struct bq24257_state *new_state) | |
334 | { | |
335 | int ret; | |
336 | ||
337 | mutex_lock(&bq->lock); | |
338 | ret = (bq->state.status != new_state->status || | |
339 | bq->state.fault != new_state->fault || | |
340 | bq->state.power_good != new_state->power_good); | |
341 | mutex_unlock(&bq->lock); | |
342 | ||
343 | return ret; | |
344 | } | |
345 | ||
346 | enum bq24257_loop_status { | |
347 | LOOP_STATUS_NONE, | |
348 | LOOP_STATUS_IN_DPM, | |
349 | LOOP_STATUS_IN_CURRENT_LIMIT, | |
350 | LOOP_STATUS_THERMAL, | |
351 | }; | |
352 | ||
353 | enum bq24257_in_ilimit { | |
354 | IILIMIT_100, | |
355 | IILIMIT_150, | |
356 | IILIMIT_500, | |
357 | IILIMIT_900, | |
358 | IILIMIT_1500, | |
359 | IILIMIT_2000, | |
360 | IILIMIT_EXT, | |
361 | IILIMIT_NONE, | |
362 | }; | |
363 | ||
364 | enum bq24257_port_type { | |
365 | PORT_TYPE_DCP, /* Dedicated Charging Port */ | |
366 | PORT_TYPE_CDP, /* Charging Downstream Port */ | |
367 | PORT_TYPE_SDP, /* Standard Downstream Port */ | |
368 | PORT_TYPE_NON_STANDARD, | |
369 | }; | |
370 | ||
371 | enum bq24257_safety_timer { | |
372 | SAFETY_TIMER_45, | |
373 | SAFETY_TIMER_360, | |
374 | SAFETY_TIMER_540, | |
375 | SAFETY_TIMER_NONE, | |
376 | }; | |
377 | ||
378 | static int bq24257_iilimit_autoset(struct bq24257_device *bq) | |
379 | { | |
380 | int loop_status; | |
381 | int iilimit; | |
382 | int port_type; | |
383 | int ret; | |
384 | const u8 new_iilimit[] = { | |
385 | [PORT_TYPE_DCP] = IILIMIT_2000, | |
386 | [PORT_TYPE_CDP] = IILIMIT_2000, | |
387 | [PORT_TYPE_SDP] = IILIMIT_500, | |
388 | [PORT_TYPE_NON_STANDARD] = IILIMIT_500 | |
389 | }; | |
390 | ||
391 | ret = bq24257_field_read(bq, F_LOOP_STATUS); | |
392 | if (ret < 0) | |
393 | goto error; | |
394 | ||
395 | loop_status = ret; | |
396 | ||
397 | ret = bq24257_field_read(bq, F_IILIMIT); | |
398 | if (ret < 0) | |
399 | goto error; | |
400 | ||
401 | iilimit = ret; | |
402 | ||
403 | /* | |
404 | * All USB ports should be able to handle 500mA. If not, DPM will lower | |
405 | * the charging current to accommodate the power source. No need to set | |
406 | * a lower IILIMIT value. | |
407 | */ | |
408 | if (loop_status == LOOP_STATUS_IN_DPM && iilimit == IILIMIT_500) | |
409 | return 0; | |
410 | ||
411 | ret = bq24257_field_read(bq, F_USB_DET); | |
412 | if (ret < 0) | |
413 | goto error; | |
414 | ||
415 | port_type = ret; | |
416 | ||
417 | ret = bq24257_field_write(bq, F_IILIMIT, new_iilimit[port_type]); | |
418 | if (ret < 0) | |
419 | goto error; | |
420 | ||
421 | ret = bq24257_field_write(bq, F_TMR, SAFETY_TIMER_360); | |
422 | if (ret < 0) | |
423 | goto error; | |
424 | ||
425 | ret = bq24257_field_write(bq, F_CLR_VDP, 1); | |
426 | if (ret < 0) | |
427 | goto error; | |
428 | ||
429 | dev_dbg(bq->dev, "port/loop = %d/%d -> iilimit = %d\n", | |
430 | port_type, loop_status, new_iilimit[port_type]); | |
431 | ||
432 | return 0; | |
433 | ||
434 | error: | |
435 | dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); | |
436 | return ret; | |
437 | } | |
438 | ||
439 | static void bq24257_iilimit_setup_work(struct work_struct *work) | |
440 | { | |
441 | struct bq24257_device *bq = container_of(work, struct bq24257_device, | |
442 | iilimit_setup_work.work); | |
443 | ||
444 | bq24257_iilimit_autoset(bq); | |
445 | } | |
446 | ||
447 | static void bq24257_handle_state_change(struct bq24257_device *bq, | |
448 | struct bq24257_state *new_state) | |
449 | { | |
450 | int ret; | |
451 | struct bq24257_state old_state; | |
452 | bool reset_iilimit = false; | |
453 | bool config_iilimit = false; | |
454 | ||
455 | mutex_lock(&bq->lock); | |
456 | old_state = bq->state; | |
457 | mutex_unlock(&bq->lock); | |
458 | ||
459 | if (!new_state->power_good) { /* power removed */ | |
460 | cancel_delayed_work_sync(&bq->iilimit_setup_work); | |
461 | ||
462 | /* activate D+/D- port detection algorithm */ | |
463 | ret = bq24257_field_write(bq, F_DPDM_EN, 1); | |
464 | if (ret < 0) | |
465 | goto error; | |
466 | ||
467 | reset_iilimit = true; | |
468 | } else if (!old_state.power_good) { /* power inserted */ | |
469 | config_iilimit = true; | |
470 | } else if (new_state->fault == FAULT_NO_BAT) { /* battery removed */ | |
471 | cancel_delayed_work_sync(&bq->iilimit_setup_work); | |
472 | ||
473 | reset_iilimit = true; | |
474 | } else if (old_state.fault == FAULT_NO_BAT) { /* battery connected */ | |
475 | config_iilimit = true; | |
476 | } else if (new_state->fault == FAULT_TIMER) { /* safety timer expired */ | |
477 | dev_err(bq->dev, "Safety timer expired! Battery dead?\n"); | |
478 | } | |
479 | ||
480 | if (reset_iilimit) { | |
481 | ret = bq24257_field_write(bq, F_IILIMIT, IILIMIT_500); | |
482 | if (ret < 0) | |
483 | goto error; | |
484 | } else if (config_iilimit) { | |
485 | schedule_delayed_work(&bq->iilimit_setup_work, | |
486 | msecs_to_jiffies(BQ24257_ILIM_SET_DELAY)); | |
487 | } | |
488 | ||
489 | return; | |
490 | ||
491 | error: | |
492 | dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); | |
493 | } | |
494 | ||
495 | static irqreturn_t bq24257_irq_handler_thread(int irq, void *private) | |
496 | { | |
497 | int ret; | |
498 | struct bq24257_device *bq = private; | |
499 | struct bq24257_state state; | |
500 | ||
501 | ret = bq24257_get_chip_state(bq, &state); | |
502 | if (ret < 0) | |
503 | return IRQ_HANDLED; | |
504 | ||
505 | if (!bq24257_state_changed(bq, &state)) | |
506 | return IRQ_HANDLED; | |
507 | ||
508 | dev_dbg(bq->dev, "irq(state changed): status/fault/pg = %d/%d/%d\n", | |
509 | state.status, state.fault, state.power_good); | |
510 | ||
511 | bq24257_handle_state_change(bq, &state); | |
512 | ||
513 | mutex_lock(&bq->lock); | |
514 | bq->state = state; | |
515 | mutex_unlock(&bq->lock); | |
516 | ||
517 | power_supply_changed(bq->charger); | |
518 | ||
519 | return IRQ_HANDLED; | |
520 | } | |
521 | ||
522 | static int bq24257_hw_init(struct bq24257_device *bq) | |
523 | { | |
524 | int ret; | |
525 | int i; | |
526 | struct bq24257_state state; | |
527 | ||
528 | const struct { | |
529 | int field; | |
530 | u32 value; | |
531 | } init_data[] = { | |
532 | {F_ICHG, bq->init_data.ichg}, | |
533 | {F_VBAT, bq->init_data.vbat}, | |
534 | {F_ITERM, bq->init_data.iterm} | |
535 | }; | |
536 | ||
537 | /* | |
538 | * Disable the watchdog timer to prevent the IC from going back to | |
539 | * default settings after 50 seconds of I2C inactivity. | |
540 | */ | |
541 | ret = bq24257_field_write(bq, F_WD_EN, 0); | |
542 | if (ret < 0) | |
543 | return ret; | |
544 | ||
545 | /* configure the charge currents and voltages */ | |
546 | for (i = 0; i < ARRAY_SIZE(init_data); i++) { | |
547 | ret = bq24257_field_write(bq, init_data[i].field, | |
548 | init_data[i].value); | |
549 | if (ret < 0) | |
550 | return ret; | |
551 | } | |
552 | ||
553 | ret = bq24257_get_chip_state(bq, &state); | |
554 | if (ret < 0) | |
555 | return ret; | |
556 | ||
557 | mutex_lock(&bq->lock); | |
558 | bq->state = state; | |
559 | mutex_unlock(&bq->lock); | |
560 | ||
561 | if (!state.power_good) | |
562 | /* activate D+/D- detection algorithm */ | |
563 | ret = bq24257_field_write(bq, F_DPDM_EN, 1); | |
564 | else if (state.fault != FAULT_NO_BAT) | |
565 | ret = bq24257_iilimit_autoset(bq); | |
566 | ||
567 | return ret; | |
568 | } | |
569 | ||
570 | static enum power_supply_property bq24257_power_supply_props[] = { | |
571 | POWER_SUPPLY_PROP_MANUFACTURER, | |
572 | POWER_SUPPLY_PROP_STATUS, | |
573 | POWER_SUPPLY_PROP_ONLINE, | |
574 | POWER_SUPPLY_PROP_HEALTH, | |
575 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, | |
576 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, | |
577 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, | |
578 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, | |
579 | POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, | |
580 | }; | |
581 | ||
582 | static char *bq24257_charger_supplied_to[] = { | |
583 | "main-battery", | |
584 | }; | |
585 | ||
586 | static const struct power_supply_desc bq24257_power_supply_desc = { | |
587 | .name = "bq24257-charger", | |
588 | .type = POWER_SUPPLY_TYPE_USB, | |
589 | .properties = bq24257_power_supply_props, | |
590 | .num_properties = ARRAY_SIZE(bq24257_power_supply_props), | |
591 | .get_property = bq24257_power_supply_get_property, | |
592 | }; | |
593 | ||
594 | static int bq24257_power_supply_init(struct bq24257_device *bq) | |
595 | { | |
596 | struct power_supply_config psy_cfg = { .drv_data = bq, }; | |
597 | ||
598 | psy_cfg.supplied_to = bq24257_charger_supplied_to; | |
599 | psy_cfg.num_supplicants = ARRAY_SIZE(bq24257_charger_supplied_to); | |
600 | ||
601 | bq->charger = power_supply_register(bq->dev, &bq24257_power_supply_desc, | |
602 | &psy_cfg); | |
603 | if (IS_ERR(bq->charger)) | |
604 | return PTR_ERR(bq->charger); | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | static int bq24257_irq_probe(struct bq24257_device *bq) | |
610 | { | |
2219a935 LP |
611 | struct gpio_desc *stat_irq; |
612 | ||
e31cd782 | 613 | stat_irq = devm_gpiod_get_index(bq->dev, BQ24257_STAT_IRQ, 0, GPIOD_IN); |
2219a935 LP |
614 | if (IS_ERR(stat_irq)) { |
615 | dev_err(bq->dev, "could not probe stat_irq pin\n"); | |
616 | return PTR_ERR(stat_irq); | |
617 | } | |
618 | ||
2219a935 LP |
619 | return gpiod_to_irq(stat_irq); |
620 | } | |
621 | ||
622 | static int bq24257_pg_gpio_probe(struct bq24257_device *bq) | |
623 | { | |
e31cd782 | 624 | bq->pg = devm_gpiod_get_index(bq->dev, BQ24257_PG_GPIO, 0, GPIOD_IN); |
2219a935 LP |
625 | if (IS_ERR(bq->pg)) { |
626 | dev_err(bq->dev, "could not probe PG pin\n"); | |
627 | return PTR_ERR(bq->pg); | |
628 | } | |
629 | ||
e31cd782 | 630 | return 0; |
2219a935 LP |
631 | } |
632 | ||
633 | static int bq24257_fw_probe(struct bq24257_device *bq) | |
634 | { | |
635 | int ret; | |
636 | u32 property; | |
637 | ||
638 | ret = device_property_read_u32(bq->dev, "ti,charge-current", &property); | |
639 | if (ret < 0) | |
640 | return ret; | |
641 | ||
642 | bq->init_data.ichg = bq24257_find_idx(property, bq24257_ichg_map, | |
643 | BQ24257_ICHG_MAP_SIZE); | |
644 | ||
645 | ret = device_property_read_u32(bq->dev, "ti,battery-regulation-voltage", | |
646 | &property); | |
647 | if (ret < 0) | |
648 | return ret; | |
649 | ||
650 | bq->init_data.vbat = bq24257_find_idx(property, bq24257_vbat_map, | |
651 | BQ24257_VBAT_MAP_SIZE); | |
652 | ||
653 | ret = device_property_read_u32(bq->dev, "ti,termination-current", | |
654 | &property); | |
655 | if (ret < 0) | |
656 | return ret; | |
657 | ||
658 | bq->init_data.iterm = bq24257_find_idx(property, bq24257_iterm_map, | |
659 | BQ24257_ITERM_MAP_SIZE); | |
660 | ||
661 | return 0; | |
662 | } | |
663 | ||
664 | static int bq24257_probe(struct i2c_client *client, | |
665 | const struct i2c_device_id *id) | |
666 | { | |
667 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
668 | struct device *dev = &client->dev; | |
669 | struct bq24257_device *bq; | |
670 | int ret; | |
671 | int i; | |
672 | ||
673 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
674 | dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); | |
675 | return -ENODEV; | |
676 | } | |
677 | ||
678 | bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); | |
679 | if (!bq) | |
680 | return -ENOMEM; | |
681 | ||
682 | bq->client = client; | |
683 | bq->dev = dev; | |
684 | ||
685 | mutex_init(&bq->lock); | |
686 | ||
687 | bq->rmap = devm_regmap_init_i2c(client, &bq24257_regmap_config); | |
688 | if (IS_ERR(bq->rmap)) { | |
689 | dev_err(dev, "failed to allocate register map\n"); | |
690 | return PTR_ERR(bq->rmap); | |
691 | } | |
692 | ||
693 | for (i = 0; i < ARRAY_SIZE(bq24257_reg_fields); i++) { | |
694 | const struct reg_field *reg_fields = bq24257_reg_fields; | |
695 | ||
696 | bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, | |
697 | reg_fields[i]); | |
698 | if (IS_ERR(bq->rmap_fields[i])) { | |
699 | dev_err(dev, "cannot allocate regmap field\n"); | |
700 | return PTR_ERR(bq->rmap_fields[i]); | |
701 | } | |
702 | } | |
703 | ||
704 | i2c_set_clientdata(client, bq); | |
705 | ||
706 | INIT_DELAYED_WORK(&bq->iilimit_setup_work, bq24257_iilimit_setup_work); | |
707 | ||
708 | if (!dev->platform_data) { | |
709 | ret = bq24257_fw_probe(bq); | |
710 | if (ret < 0) { | |
711 | dev_err(dev, "Cannot read device properties.\n"); | |
712 | return ret; | |
713 | } | |
714 | } else { | |
715 | return -ENODEV; | |
716 | } | |
717 | ||
718 | /* we can only check Power Good status by probing the PG pin */ | |
719 | ret = bq24257_pg_gpio_probe(bq); | |
720 | if (ret < 0) | |
721 | return ret; | |
722 | ||
723 | /* reset all registers to defaults */ | |
724 | ret = bq24257_field_write(bq, F_RESET, 1); | |
725 | if (ret < 0) | |
726 | return ret; | |
727 | ||
728 | /* | |
729 | * Put the RESET bit back to 0, in cache. For some reason the HW always | |
730 | * returns 1 on this bit, so this is the only way to avoid resetting the | |
731 | * chip every time we update another field in this register. | |
732 | */ | |
733 | ret = bq24257_field_write(bq, F_RESET, 0); | |
734 | if (ret < 0) | |
735 | return ret; | |
736 | ||
737 | ret = bq24257_hw_init(bq); | |
738 | if (ret < 0) { | |
739 | dev_err(dev, "Cannot initialize the chip.\n"); | |
740 | return ret; | |
741 | } | |
742 | ||
743 | if (client->irq <= 0) | |
744 | client->irq = bq24257_irq_probe(bq); | |
745 | ||
746 | if (client->irq < 0) { | |
747 | dev_err(dev, "no irq resource found\n"); | |
748 | return client->irq; | |
749 | } | |
750 | ||
751 | ret = devm_request_threaded_irq(dev, client->irq, NULL, | |
752 | bq24257_irq_handler_thread, | |
753 | IRQF_TRIGGER_FALLING | | |
754 | IRQF_TRIGGER_RISING | IRQF_ONESHOT, | |
755 | BQ24257_STAT_IRQ, bq); | |
756 | if (ret) | |
757 | return ret; | |
758 | ||
759 | ret = bq24257_power_supply_init(bq); | |
760 | if (ret < 0) | |
761 | dev_err(dev, "Failed to register power supply\n"); | |
762 | ||
763 | return ret; | |
764 | } | |
765 | ||
766 | static int bq24257_remove(struct i2c_client *client) | |
767 | { | |
768 | struct bq24257_device *bq = i2c_get_clientdata(client); | |
769 | ||
770 | cancel_delayed_work_sync(&bq->iilimit_setup_work); | |
771 | ||
772 | power_supply_unregister(bq->charger); | |
773 | ||
774 | bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */ | |
775 | ||
776 | return 0; | |
777 | } | |
778 | ||
779 | #ifdef CONFIG_PM_SLEEP | |
780 | static int bq24257_suspend(struct device *dev) | |
781 | { | |
782 | struct bq24257_device *bq = dev_get_drvdata(dev); | |
783 | int ret = 0; | |
784 | ||
785 | cancel_delayed_work_sync(&bq->iilimit_setup_work); | |
786 | ||
787 | /* reset all registers to default (and activate standalone mode) */ | |
788 | ret = bq24257_field_write(bq, F_RESET, 1); | |
789 | if (ret < 0) | |
790 | dev_err(bq->dev, "Cannot reset chip to standalone mode.\n"); | |
791 | ||
792 | return ret; | |
793 | } | |
794 | ||
795 | static int bq24257_resume(struct device *dev) | |
796 | { | |
797 | int ret; | |
798 | struct bq24257_device *bq = dev_get_drvdata(dev); | |
799 | ||
800 | ret = regcache_drop_region(bq->rmap, BQ24257_REG_1, BQ24257_REG_7); | |
801 | if (ret < 0) | |
802 | return ret; | |
803 | ||
804 | ret = bq24257_field_write(bq, F_RESET, 0); | |
805 | if (ret < 0) | |
806 | return ret; | |
807 | ||
808 | ret = bq24257_hw_init(bq); | |
809 | if (ret < 0) { | |
810 | dev_err(bq->dev, "Cannot init chip after resume.\n"); | |
811 | return ret; | |
812 | } | |
813 | ||
814 | /* signal userspace, maybe state changed while suspended */ | |
815 | power_supply_changed(bq->charger); | |
816 | ||
817 | return 0; | |
818 | } | |
819 | #endif | |
820 | ||
821 | static const struct dev_pm_ops bq24257_pm = { | |
822 | SET_SYSTEM_SLEEP_PM_OPS(bq24257_suspend, bq24257_resume) | |
823 | }; | |
824 | ||
825 | static const struct i2c_device_id bq24257_i2c_ids[] = { | |
826 | { "bq24257", 0 }, | |
827 | {}, | |
828 | }; | |
829 | MODULE_DEVICE_TABLE(i2c, bq24257_i2c_ids); | |
830 | ||
831 | static const struct of_device_id bq24257_of_match[] = { | |
832 | { .compatible = "ti,bq24257", }, | |
833 | { }, | |
834 | }; | |
835 | MODULE_DEVICE_TABLE(of, bq24257_of_match); | |
836 | ||
837 | static const struct acpi_device_id bq24257_acpi_match[] = { | |
838 | {"BQ242570", 0}, | |
839 | {}, | |
840 | }; | |
841 | MODULE_DEVICE_TABLE(acpi, bq24257_acpi_match); | |
842 | ||
843 | static struct i2c_driver bq24257_driver = { | |
844 | .driver = { | |
845 | .name = "bq24257-charger", | |
846 | .of_match_table = of_match_ptr(bq24257_of_match), | |
847 | .acpi_match_table = ACPI_PTR(bq24257_acpi_match), | |
848 | .pm = &bq24257_pm, | |
849 | }, | |
850 | .probe = bq24257_probe, | |
851 | .remove = bq24257_remove, | |
852 | .id_table = bq24257_i2c_ids, | |
853 | }; | |
854 | module_i2c_driver(bq24257_driver); | |
855 | ||
856 | MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); | |
857 | MODULE_DESCRIPTION("bq24257 charger driver"); | |
858 | MODULE_LICENSE("GPL"); |