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87c2d906 KK |
1 | /* |
2 | * max77693_charger.c - Battery charger driver for the Maxim 77693 | |
3 | * | |
4 | * Copyright (C) 2014 Samsung Electronics | |
5 | * Krzysztof Kozlowski <k.kozlowski@samsung.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/power_supply.h> | |
21 | #include <linux/regmap.h> | |
22 | #include <linux/mfd/max77693.h> | |
23 | #include <linux/mfd/max77693-private.h> | |
24 | ||
25 | static const char *max77693_charger_name = "max77693-charger"; | |
26 | static const char *max77693_charger_model = "MAX77693"; | |
27 | static const char *max77693_charger_manufacturer = "Maxim Integrated"; | |
28 | ||
29 | struct max77693_charger { | |
30 | struct device *dev; | |
31 | struct max77693_dev *max77693; | |
32 | struct power_supply charger; | |
33 | ||
34 | u32 constant_volt; | |
35 | u32 min_system_volt; | |
36 | u32 thermal_regulation_temp; | |
37 | u32 batttery_overcurrent; | |
38 | u32 charge_input_threshold_volt; | |
39 | }; | |
40 | ||
41 | static int max77693_get_charger_state(struct regmap *regmap) | |
42 | { | |
43 | int state; | |
44 | unsigned int data; | |
45 | ||
46 | if (regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data) < 0) | |
47 | return POWER_SUPPLY_STATUS_UNKNOWN; | |
48 | ||
49 | data &= CHG_DETAILS_01_CHG_MASK; | |
50 | data >>= CHG_DETAILS_01_CHG_SHIFT; | |
51 | ||
52 | switch (data) { | |
53 | case MAX77693_CHARGING_PREQUALIFICATION: | |
54 | case MAX77693_CHARGING_FAST_CONST_CURRENT: | |
55 | case MAX77693_CHARGING_FAST_CONST_VOLTAGE: | |
56 | case MAX77693_CHARGING_TOP_OFF: | |
57 | /* In high temp the charging current is reduced, but still charging */ | |
58 | case MAX77693_CHARGING_HIGH_TEMP: | |
59 | state = POWER_SUPPLY_STATUS_CHARGING; | |
60 | break; | |
61 | case MAX77693_CHARGING_DONE: | |
62 | state = POWER_SUPPLY_STATUS_FULL; | |
63 | break; | |
64 | case MAX77693_CHARGING_TIMER_EXPIRED: | |
65 | case MAX77693_CHARGING_THERMISTOR_SUSPEND: | |
66 | state = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
67 | break; | |
68 | case MAX77693_CHARGING_OFF: | |
69 | case MAX77693_CHARGING_OVER_TEMP: | |
70 | case MAX77693_CHARGING_WATCHDOG_EXPIRED: | |
71 | state = POWER_SUPPLY_STATUS_DISCHARGING; | |
72 | break; | |
73 | case MAX77693_CHARGING_RESERVED: | |
74 | default: | |
75 | state = POWER_SUPPLY_STATUS_UNKNOWN; | |
76 | } | |
77 | ||
78 | return state; | |
79 | } | |
80 | ||
81 | static int max77693_get_charge_type(struct regmap *regmap) | |
82 | { | |
83 | int state; | |
84 | unsigned int data; | |
85 | ||
86 | if (regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data) < 0) | |
87 | return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; | |
88 | ||
89 | data &= CHG_DETAILS_01_CHG_MASK; | |
90 | data >>= CHG_DETAILS_01_CHG_SHIFT; | |
91 | ||
92 | switch (data) { | |
93 | case MAX77693_CHARGING_PREQUALIFICATION: | |
94 | /* | |
95 | * Top-off: trickle or fast? In top-off the current varies between | |
96 | * 100 and 250 mA. It is higher than prequalification current. | |
97 | */ | |
98 | case MAX77693_CHARGING_TOP_OFF: | |
99 | state = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; | |
100 | break; | |
101 | case MAX77693_CHARGING_FAST_CONST_CURRENT: | |
102 | case MAX77693_CHARGING_FAST_CONST_VOLTAGE: | |
103 | /* In high temp the charging current is reduced, but still charging */ | |
104 | case MAX77693_CHARGING_HIGH_TEMP: | |
105 | state = POWER_SUPPLY_CHARGE_TYPE_FAST; | |
106 | break; | |
107 | case MAX77693_CHARGING_DONE: | |
108 | case MAX77693_CHARGING_TIMER_EXPIRED: | |
109 | case MAX77693_CHARGING_THERMISTOR_SUSPEND: | |
110 | case MAX77693_CHARGING_OFF: | |
111 | case MAX77693_CHARGING_OVER_TEMP: | |
112 | case MAX77693_CHARGING_WATCHDOG_EXPIRED: | |
113 | state = POWER_SUPPLY_CHARGE_TYPE_NONE; | |
114 | break; | |
115 | case MAX77693_CHARGING_RESERVED: | |
116 | default: | |
117 | state = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; | |
118 | } | |
119 | ||
120 | return state; | |
121 | } | |
122 | ||
123 | /* | |
124 | * Supported health statuses: | |
125 | * - POWER_SUPPLY_HEALTH_DEAD | |
126 | * - POWER_SUPPLY_HEALTH_GOOD | |
127 | * - POWER_SUPPLY_HEALTH_OVERVOLTAGE | |
128 | * - POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE | |
129 | * - POWER_SUPPLY_HEALTH_UNKNOWN | |
130 | * - POWER_SUPPLY_HEALTH_UNSPEC_FAILURE | |
131 | */ | |
132 | static int max77693_get_battery_health(struct regmap *regmap) | |
133 | { | |
134 | int state; | |
135 | unsigned int data; | |
136 | ||
137 | if (regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data) < 0) | |
138 | return POWER_SUPPLY_HEALTH_UNKNOWN; | |
139 | ||
140 | data &= CHG_DETAILS_01_BAT_MASK; | |
141 | data >>= CHG_DETAILS_01_BAT_SHIFT; | |
142 | ||
143 | switch (data) { | |
144 | case MAX77693_BATTERY_NOBAT: | |
145 | state = POWER_SUPPLY_HEALTH_DEAD; | |
146 | break; | |
147 | case MAX77693_BATTERY_PREQUALIFICATION: | |
148 | case MAX77693_BATTERY_GOOD: | |
149 | case MAX77693_BATTERY_LOWVOLTAGE: | |
150 | state = POWER_SUPPLY_HEALTH_GOOD; | |
151 | break; | |
152 | case MAX77693_BATTERY_TIMER_EXPIRED: | |
153 | /* | |
154 | * Took longer to charge than expected, charging suspended. | |
155 | * Damaged battery? | |
156 | */ | |
157 | state = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; | |
158 | break; | |
159 | case MAX77693_BATTERY_OVERVOLTAGE: | |
160 | state = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
161 | break; | |
162 | case MAX77693_BATTERY_OVERCURRENT: | |
163 | state = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
164 | break; | |
165 | case MAX77693_BATTERY_RESERVED: | |
166 | default: | |
167 | state = POWER_SUPPLY_HEALTH_UNKNOWN; | |
168 | break; | |
169 | } | |
170 | ||
171 | return state; | |
172 | } | |
173 | ||
174 | static int max77693_get_present(struct regmap *regmap) | |
175 | { | |
176 | unsigned int data; | |
177 | ||
178 | /* | |
179 | * Read CHG_INT_OK register. High DETBAT bit here should be | |
180 | * equal to value 0x0 in CHG_DETAILS_01/BAT field. | |
181 | */ | |
182 | regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); | |
183 | if (data & CHG_INT_OK_DETBAT_MASK) | |
184 | return 0; | |
185 | return 1; | |
186 | } | |
187 | ||
188 | static int max77693_get_online(struct regmap *regmap) | |
189 | { | |
190 | unsigned int data; | |
191 | ||
192 | regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); | |
193 | if (data & CHG_INT_OK_CHGIN_MASK) | |
194 | return 1; | |
195 | return 0; | |
196 | } | |
197 | ||
198 | static enum power_supply_property max77693_charger_props[] = { | |
199 | POWER_SUPPLY_PROP_STATUS, | |
200 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
201 | POWER_SUPPLY_PROP_HEALTH, | |
202 | POWER_SUPPLY_PROP_PRESENT, | |
203 | POWER_SUPPLY_PROP_ONLINE, | |
204 | POWER_SUPPLY_PROP_MODEL_NAME, | |
205 | POWER_SUPPLY_PROP_MANUFACTURER, | |
206 | }; | |
207 | ||
208 | static int max77693_charger_get_property(struct power_supply *psy, | |
209 | enum power_supply_property psp, | |
210 | union power_supply_propval *val) | |
211 | { | |
212 | struct max77693_charger *chg = container_of(psy, | |
213 | struct max77693_charger, | |
214 | charger); | |
215 | struct regmap *regmap = chg->max77693->regmap; | |
216 | int ret = 0; | |
217 | ||
218 | switch (psp) { | |
219 | case POWER_SUPPLY_PROP_STATUS: | |
220 | val->intval = max77693_get_charger_state(regmap); | |
221 | break; | |
222 | case POWER_SUPPLY_PROP_CHARGE_TYPE: | |
223 | val->intval = max77693_get_charge_type(regmap); | |
224 | break; | |
225 | case POWER_SUPPLY_PROP_HEALTH: | |
226 | val->intval = max77693_get_battery_health(regmap); | |
227 | break; | |
228 | case POWER_SUPPLY_PROP_PRESENT: | |
229 | val->intval = max77693_get_present(regmap); | |
230 | break; | |
231 | case POWER_SUPPLY_PROP_ONLINE: | |
232 | val->intval = max77693_get_online(regmap); | |
233 | break; | |
234 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
235 | val->strval = max77693_charger_model; | |
236 | break; | |
237 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
238 | val->strval = max77693_charger_manufacturer; | |
239 | break; | |
240 | default: | |
241 | return -EINVAL; | |
242 | } | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
247 | static ssize_t device_attr_store(struct device *dev, | |
248 | struct device_attribute *attr, const char *buf, size_t count, | |
249 | int (*fn)(struct max77693_charger *, unsigned long)) | |
250 | { | |
251 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
252 | unsigned long val; | |
253 | int ret; | |
254 | ||
255 | ret = kstrtoul(buf, 10, &val); | |
256 | if (ret) | |
257 | return ret; | |
258 | ||
259 | ret = fn(chg, val); | |
260 | if (ret) | |
261 | return ret; | |
262 | ||
263 | return count; | |
264 | } | |
265 | ||
266 | static ssize_t fast_charge_timer_show(struct device *dev, | |
267 | struct device_attribute *attr, char *buf) | |
268 | { | |
269 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
270 | unsigned int data, val; | |
271 | int ret; | |
272 | ||
273 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_01, | |
274 | &data); | |
275 | if (ret < 0) | |
276 | return ret; | |
277 | ||
278 | data &= CHG_CNFG_01_FCHGTIME_MASK; | |
279 | data >>= CHG_CNFG_01_FCHGTIME_SHIFT; | |
280 | switch (data) { | |
281 | case 0x1 ... 0x7: | |
282 | /* Starting from 4 hours, step by 2 hours */ | |
283 | val = 4 + (data - 1) * 2; | |
284 | break; | |
285 | case 0x0: | |
286 | default: | |
287 | val = 0; | |
288 | break; | |
289 | } | |
290 | ||
291 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
292 | } | |
293 | ||
294 | static int max77693_set_fast_charge_timer(struct max77693_charger *chg, | |
295 | unsigned long hours) | |
296 | { | |
297 | unsigned int data; | |
298 | ||
299 | /* | |
300 | * 0x00 - disable | |
301 | * 0x01 - 4h | |
302 | * 0x02 - 6h | |
303 | * ... | |
304 | * 0x07 - 16h | |
305 | * Round down odd values. | |
306 | */ | |
307 | switch (hours) { | |
308 | case 4 ... 16: | |
309 | data = (hours - 4) / 2 + 1; | |
310 | break; | |
311 | case 0: | |
312 | /* Disable */ | |
313 | data = 0; | |
314 | break; | |
315 | default: | |
316 | return -EINVAL; | |
317 | } | |
318 | data <<= CHG_CNFG_01_FCHGTIME_SHIFT; | |
319 | ||
320 | return regmap_update_bits(chg->max77693->regmap, | |
321 | MAX77693_CHG_REG_CHG_CNFG_01, | |
322 | CHG_CNFG_01_FCHGTIME_MASK, data); | |
323 | } | |
324 | ||
325 | static ssize_t fast_charge_timer_store(struct device *dev, | |
326 | struct device_attribute *attr, const char *buf, size_t count) | |
327 | { | |
328 | return device_attr_store(dev, attr, buf, count, | |
329 | max77693_set_fast_charge_timer); | |
330 | } | |
331 | ||
332 | static ssize_t top_off_threshold_current_show(struct device *dev, | |
333 | struct device_attribute *attr, char *buf) | |
334 | { | |
335 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
336 | unsigned int data, val; | |
337 | int ret; | |
338 | ||
339 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, | |
340 | &data); | |
341 | if (ret < 0) | |
342 | return ret; | |
343 | ||
344 | data &= CHG_CNFG_03_TOITH_MASK; | |
345 | data >>= CHG_CNFG_03_TOITH_SHIFT; | |
346 | ||
347 | if (data <= 0x04) | |
348 | val = 100000 + data * 25000; | |
349 | else | |
350 | val = data * 50000; | |
351 | ||
352 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
353 | } | |
354 | ||
355 | static int max77693_set_top_off_threshold_current(struct max77693_charger *chg, | |
356 | unsigned long uamp) | |
357 | { | |
358 | unsigned int data; | |
359 | ||
360 | if (uamp < 100000 || uamp > 350000) | |
361 | return -EINVAL; | |
362 | ||
363 | if (uamp <= 200000) | |
364 | data = (uamp - 100000) / 25000; | |
365 | else | |
366 | /* (200000, 350000> */ | |
367 | data = uamp / 50000; | |
368 | ||
369 | data <<= CHG_CNFG_03_TOITH_SHIFT; | |
370 | ||
371 | return regmap_update_bits(chg->max77693->regmap, | |
372 | MAX77693_CHG_REG_CHG_CNFG_03, | |
373 | CHG_CNFG_03_TOITH_MASK, data); | |
374 | } | |
375 | ||
376 | static ssize_t top_off_threshold_current_store(struct device *dev, | |
377 | struct device_attribute *attr, const char *buf, size_t count) | |
378 | { | |
379 | return device_attr_store(dev, attr, buf, count, | |
380 | max77693_set_top_off_threshold_current); | |
381 | } | |
382 | ||
383 | static ssize_t top_off_timer_show(struct device *dev, | |
384 | struct device_attribute *attr, char *buf) | |
385 | { | |
386 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
387 | unsigned int data, val; | |
388 | int ret; | |
389 | ||
390 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, | |
391 | &data); | |
392 | if (ret < 0) | |
393 | return ret; | |
394 | ||
395 | data &= CHG_CNFG_03_TOTIME_MASK; | |
396 | data >>= CHG_CNFG_03_TOTIME_SHIFT; | |
397 | ||
398 | val = data * 10; | |
399 | ||
400 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
401 | } | |
402 | ||
403 | static int max77693_set_top_off_timer(struct max77693_charger *chg, | |
404 | unsigned long minutes) | |
405 | { | |
406 | unsigned int data; | |
407 | ||
408 | if (minutes > 70) | |
409 | return -EINVAL; | |
410 | ||
411 | data = minutes / 10; | |
412 | data <<= CHG_CNFG_03_TOTIME_SHIFT; | |
413 | ||
414 | return regmap_update_bits(chg->max77693->regmap, | |
415 | MAX77693_CHG_REG_CHG_CNFG_03, | |
416 | CHG_CNFG_03_TOTIME_MASK, data); | |
417 | } | |
418 | ||
419 | static ssize_t top_off_timer_store(struct device *dev, | |
420 | struct device_attribute *attr, const char *buf, size_t count) | |
421 | { | |
422 | return device_attr_store(dev, attr, buf, count, | |
423 | max77693_set_top_off_timer); | |
424 | } | |
425 | ||
426 | static DEVICE_ATTR_RW(fast_charge_timer); | |
427 | static DEVICE_ATTR_RW(top_off_threshold_current); | |
428 | static DEVICE_ATTR_RW(top_off_timer); | |
429 | ||
430 | static int max77693_set_constant_volt(struct max77693_charger *chg, | |
431 | unsigned int uvolt) | |
432 | { | |
433 | unsigned int data; | |
434 | ||
435 | /* | |
436 | * 0x00 - 3.650 V | |
437 | * 0x01 - 3.675 V | |
438 | * ... | |
439 | * 0x1b - 4.325 V | |
440 | * 0x1c - 4.340 V | |
441 | * 0x1d - 4.350 V | |
442 | * 0x1e - 4.375 V | |
443 | * 0x1f - 4.400 V | |
444 | */ | |
445 | if (uvolt >= 3650000 && uvolt < 4340000) | |
446 | data = (uvolt - 3650000) / 25000; | |
447 | else if (uvolt >= 4340000 && uvolt < 4350000) | |
448 | data = 0x1c; | |
449 | else if (uvolt >= 4350000 && uvolt <= 4400000) | |
450 | data = 0x1d + (uvolt - 4350000) / 25000; | |
451 | else { | |
452 | dev_err(chg->dev, "Wrong value for charging constant voltage\n"); | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
456 | data <<= CHG_CNFG_04_CHGCVPRM_SHIFT; | |
457 | ||
458 | dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt, | |
459 | data); | |
460 | ||
461 | return regmap_update_bits(chg->max77693->regmap, | |
462 | MAX77693_CHG_REG_CHG_CNFG_04, | |
463 | CHG_CNFG_04_CHGCVPRM_MASK, data); | |
464 | } | |
465 | ||
466 | static int max77693_set_min_system_volt(struct max77693_charger *chg, | |
467 | unsigned int uvolt) | |
468 | { | |
469 | unsigned int data; | |
470 | ||
471 | if (uvolt < 3000000 || uvolt > 3700000) { | |
472 | dev_err(chg->dev, "Wrong value for minimum system regulation voltage\n"); | |
473 | return -EINVAL; | |
474 | } | |
475 | ||
476 | data = (uvolt - 3000000) / 100000; | |
477 | ||
478 | data <<= CHG_CNFG_04_MINVSYS_SHIFT; | |
479 | ||
480 | dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n", | |
481 | uvolt, data); | |
482 | ||
483 | return regmap_update_bits(chg->max77693->regmap, | |
484 | MAX77693_CHG_REG_CHG_CNFG_04, | |
485 | CHG_CNFG_04_MINVSYS_MASK, data); | |
486 | } | |
487 | ||
488 | static int max77693_set_thermal_regulation_temp(struct max77693_charger *chg, | |
489 | unsigned int cels) | |
490 | { | |
491 | unsigned int data; | |
492 | ||
493 | switch (cels) { | |
494 | case 70: | |
495 | case 85: | |
496 | case 100: | |
497 | case 115: | |
498 | data = (cels - 70) / 15; | |
499 | break; | |
500 | default: | |
501 | dev_err(chg->dev, "Wrong value for thermal regulation loop temperature\n"); | |
502 | return -EINVAL; | |
503 | } | |
504 | ||
505 | data <<= CHG_CNFG_07_REGTEMP_SHIFT; | |
506 | ||
507 | dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n", | |
508 | cels, data); | |
509 | ||
510 | return regmap_update_bits(chg->max77693->regmap, | |
511 | MAX77693_CHG_REG_CHG_CNFG_07, | |
512 | CHG_CNFG_07_REGTEMP_MASK, data); | |
513 | } | |
514 | ||
515 | static int max77693_set_batttery_overcurrent(struct max77693_charger *chg, | |
516 | unsigned int uamp) | |
517 | { | |
518 | unsigned int data; | |
519 | ||
520 | if (uamp && (uamp < 2000000 || uamp > 3500000)) { | |
521 | dev_err(chg->dev, "Wrong value for battery overcurrent\n"); | |
522 | return -EINVAL; | |
523 | } | |
524 | ||
525 | if (uamp) | |
526 | data = ((uamp - 2000000) / 250000) + 1; | |
527 | else | |
528 | data = 0; /* disable */ | |
529 | ||
530 | data <<= CHG_CNFG_12_B2SOVRC_SHIFT; | |
531 | ||
532 | dev_dbg(chg->dev, "Battery overcurrent: %u (0x%x)\n", uamp, data); | |
533 | ||
534 | return regmap_update_bits(chg->max77693->regmap, | |
535 | MAX77693_CHG_REG_CHG_CNFG_12, | |
536 | CHG_CNFG_12_B2SOVRC_MASK, data); | |
537 | } | |
538 | ||
539 | static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg, | |
540 | unsigned int uvolt) | |
541 | { | |
542 | unsigned int data; | |
543 | ||
544 | switch (uvolt) { | |
545 | case 4300000: | |
546 | data = 0x0; | |
547 | break; | |
548 | case 4700000: | |
549 | case 4800000: | |
550 | case 4900000: | |
551 | data = (uvolt - 4700000) / 100000; | |
552 | default: | |
553 | dev_err(chg->dev, "Wrong value for charge input voltage regulation threshold\n"); | |
554 | return -EINVAL; | |
555 | } | |
556 | ||
557 | data <<= CHG_CNFG_12_VCHGINREG_SHIFT; | |
558 | ||
559 | dev_dbg(chg->dev, "Charge input voltage regulation threshold: %u (0x%x)\n", | |
560 | uvolt, data); | |
561 | ||
562 | return regmap_update_bits(chg->max77693->regmap, | |
563 | MAX77693_CHG_REG_CHG_CNFG_12, | |
564 | CHG_CNFG_12_VCHGINREG_MASK, data); | |
565 | } | |
566 | ||
567 | /* | |
568 | * Sets charger registers to proper and safe default values. | |
569 | */ | |
570 | static int max77693_reg_init(struct max77693_charger *chg) | |
571 | { | |
572 | int ret; | |
573 | unsigned int data; | |
574 | ||
575 | /* Unlock charger register protection */ | |
576 | data = (0x3 << CHG_CNFG_06_CHGPROT_SHIFT); | |
577 | ret = regmap_update_bits(chg->max77693->regmap, | |
578 | MAX77693_CHG_REG_CHG_CNFG_06, | |
579 | CHG_CNFG_06_CHGPROT_MASK, data); | |
580 | if (ret) { | |
581 | dev_err(chg->dev, "Error unlocking registers: %d\n", ret); | |
582 | return ret; | |
583 | } | |
584 | ||
585 | ret = max77693_set_fast_charge_timer(chg, DEFAULT_FAST_CHARGE_TIMER); | |
586 | if (ret) | |
587 | return ret; | |
588 | ||
589 | ret = max77693_set_top_off_threshold_current(chg, | |
590 | DEFAULT_TOP_OFF_THRESHOLD_CURRENT); | |
591 | if (ret) | |
592 | return ret; | |
593 | ||
594 | ret = max77693_set_top_off_timer(chg, DEFAULT_TOP_OFF_TIMER); | |
595 | if (ret) | |
596 | return ret; | |
597 | ||
598 | ret = max77693_set_constant_volt(chg, chg->constant_volt); | |
599 | if (ret) | |
600 | return ret; | |
601 | ||
602 | ret = max77693_set_min_system_volt(chg, chg->min_system_volt); | |
603 | if (ret) | |
604 | return ret; | |
605 | ||
606 | ret = max77693_set_thermal_regulation_temp(chg, | |
607 | chg->thermal_regulation_temp); | |
608 | if (ret) | |
609 | return ret; | |
610 | ||
611 | ret = max77693_set_batttery_overcurrent(chg, chg->batttery_overcurrent); | |
612 | if (ret) | |
613 | return ret; | |
614 | ||
5b40b3e6 | 615 | return max77693_set_charge_input_threshold_volt(chg, |
87c2d906 | 616 | chg->charge_input_threshold_volt); |
87c2d906 KK |
617 | } |
618 | ||
619 | #ifdef CONFIG_OF | |
620 | static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) | |
621 | { | |
622 | struct device_node *np = dev->of_node; | |
623 | ||
624 | if (!np) { | |
625 | dev_err(dev, "no charger OF node\n"); | |
626 | return -EINVAL; | |
627 | } | |
628 | ||
629 | if (of_property_read_u32(np, "maxim,constant-microvolt", | |
630 | &chg->constant_volt)) | |
631 | chg->constant_volt = DEFAULT_CONSTANT_VOLT; | |
632 | ||
633 | if (of_property_read_u32(np, "maxim,min-system-microvolt", | |
634 | &chg->min_system_volt)) | |
635 | chg->min_system_volt = DEFAULT_MIN_SYSTEM_VOLT; | |
636 | ||
637 | if (of_property_read_u32(np, "maxim,thermal-regulation-celsius", | |
638 | &chg->thermal_regulation_temp)) | |
639 | chg->thermal_regulation_temp = DEFAULT_THERMAL_REGULATION_TEMP; | |
640 | ||
641 | if (of_property_read_u32(np, "maxim,battery-overcurrent-microamp", | |
642 | &chg->batttery_overcurrent)) | |
643 | chg->batttery_overcurrent = DEFAULT_BATTERY_OVERCURRENT; | |
644 | ||
645 | if (of_property_read_u32(np, "maxim,charge-input-threshold-microvolt", | |
646 | &chg->charge_input_threshold_volt)) | |
647 | chg->charge_input_threshold_volt = | |
648 | DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT; | |
649 | ||
650 | return 0; | |
651 | } | |
652 | #else /* CONFIG_OF */ | |
653 | static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) | |
654 | { | |
655 | return 0; | |
656 | } | |
657 | #endif /* CONFIG_OF */ | |
658 | ||
659 | static int max77693_charger_probe(struct platform_device *pdev) | |
660 | { | |
661 | struct max77693_charger *chg; | |
662 | struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent); | |
663 | int ret; | |
664 | ||
665 | chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL); | |
666 | if (!chg) | |
667 | return -ENOMEM; | |
668 | ||
669 | platform_set_drvdata(pdev, chg); | |
670 | chg->dev = &pdev->dev; | |
671 | chg->max77693 = max77693; | |
672 | ||
673 | ret = max77693_dt_init(&pdev->dev, chg); | |
674 | if (ret) | |
675 | return ret; | |
676 | ||
677 | ret = max77693_reg_init(chg); | |
678 | if (ret) | |
679 | return ret; | |
680 | ||
681 | chg->charger.name = max77693_charger_name; | |
682 | chg->charger.type = POWER_SUPPLY_TYPE_BATTERY; | |
683 | chg->charger.properties = max77693_charger_props; | |
684 | chg->charger.num_properties = ARRAY_SIZE(max77693_charger_props); | |
685 | chg->charger.get_property = max77693_charger_get_property; | |
686 | ||
687 | ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer); | |
688 | if (ret) { | |
689 | dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n"); | |
690 | goto err; | |
691 | } | |
692 | ||
693 | ret = device_create_file(&pdev->dev, | |
694 | &dev_attr_top_off_threshold_current); | |
695 | if (ret) { | |
696 | dev_err(&pdev->dev, "failed: create top off current sysfs entry\n"); | |
697 | goto err; | |
698 | } | |
699 | ||
700 | ret = device_create_file(&pdev->dev, &dev_attr_top_off_timer); | |
701 | if (ret) { | |
702 | dev_err(&pdev->dev, "failed: create top off timer sysfs entry\n"); | |
703 | goto err; | |
704 | } | |
705 | ||
706 | ret = power_supply_register(&pdev->dev, &chg->charger); | |
707 | if (ret) { | |
708 | dev_err(&pdev->dev, "failed: power supply register\n"); | |
709 | goto err; | |
710 | } | |
711 | ||
712 | return 0; | |
713 | ||
714 | err: | |
715 | device_remove_file(&pdev->dev, &dev_attr_top_off_timer); | |
716 | device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); | |
717 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); | |
718 | ||
719 | return ret; | |
720 | } | |
721 | ||
722 | static int max77693_charger_remove(struct platform_device *pdev) | |
723 | { | |
724 | struct max77693_charger *chg = platform_get_drvdata(pdev); | |
725 | ||
726 | device_remove_file(&pdev->dev, &dev_attr_top_off_timer); | |
727 | device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); | |
728 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); | |
729 | ||
730 | power_supply_unregister(&chg->charger); | |
731 | ||
732 | return 0; | |
733 | } | |
734 | ||
735 | static const struct platform_device_id max77693_charger_id[] = { | |
736 | { "max77693-charger", 0, }, | |
737 | { } | |
738 | }; | |
739 | MODULE_DEVICE_TABLE(platform, max77693_charger_id); | |
740 | ||
741 | static struct platform_driver max77693_charger_driver = { | |
742 | .driver = { | |
87c2d906 KK |
743 | .name = "max77693-charger", |
744 | }, | |
745 | .probe = max77693_charger_probe, | |
746 | .remove = max77693_charger_remove, | |
747 | .id_table = max77693_charger_id, | |
748 | }; | |
749 | module_platform_driver(max77693_charger_driver); | |
750 | ||
751 | MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); | |
752 | MODULE_DESCRIPTION("Maxim 77693 charger driver"); | |
753 | MODULE_LICENSE("GPL"); |