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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 | ||
297d716f | 25 | #define MAX77693_CHARGER_NAME "max77693-charger" |
87c2d906 KK |
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; | |
297d716f | 32 | struct power_supply *charger; |
87c2d906 KK |
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 | ||
1ed522b3 | 41 | static int max77693_get_charger_state(struct regmap *regmap, int *val) |
87c2d906 | 42 | { |
1ed522b3 | 43 | int ret; |
87c2d906 KK |
44 | unsigned int data; |
45 | ||
1ed522b3 KK |
46 | ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data); |
47 | if (ret < 0) | |
48 | return ret; | |
87c2d906 KK |
49 | |
50 | data &= CHG_DETAILS_01_CHG_MASK; | |
51 | data >>= CHG_DETAILS_01_CHG_SHIFT; | |
52 | ||
53 | switch (data) { | |
54 | case MAX77693_CHARGING_PREQUALIFICATION: | |
55 | case MAX77693_CHARGING_FAST_CONST_CURRENT: | |
56 | case MAX77693_CHARGING_FAST_CONST_VOLTAGE: | |
57 | case MAX77693_CHARGING_TOP_OFF: | |
58 | /* In high temp the charging current is reduced, but still charging */ | |
59 | case MAX77693_CHARGING_HIGH_TEMP: | |
1ed522b3 | 60 | *val = POWER_SUPPLY_STATUS_CHARGING; |
87c2d906 KK |
61 | break; |
62 | case MAX77693_CHARGING_DONE: | |
1ed522b3 | 63 | *val = POWER_SUPPLY_STATUS_FULL; |
87c2d906 KK |
64 | break; |
65 | case MAX77693_CHARGING_TIMER_EXPIRED: | |
66 | case MAX77693_CHARGING_THERMISTOR_SUSPEND: | |
1ed522b3 | 67 | *val = POWER_SUPPLY_STATUS_NOT_CHARGING; |
87c2d906 KK |
68 | break; |
69 | case MAX77693_CHARGING_OFF: | |
70 | case MAX77693_CHARGING_OVER_TEMP: | |
71 | case MAX77693_CHARGING_WATCHDOG_EXPIRED: | |
1ed522b3 | 72 | *val = POWER_SUPPLY_STATUS_DISCHARGING; |
87c2d906 KK |
73 | break; |
74 | case MAX77693_CHARGING_RESERVED: | |
75 | default: | |
1ed522b3 | 76 | *val = POWER_SUPPLY_STATUS_UNKNOWN; |
87c2d906 KK |
77 | } |
78 | ||
1ed522b3 | 79 | return 0; |
87c2d906 KK |
80 | } |
81 | ||
1ed522b3 | 82 | static int max77693_get_charge_type(struct regmap *regmap, int *val) |
87c2d906 | 83 | { |
1ed522b3 | 84 | int ret; |
87c2d906 KK |
85 | unsigned int data; |
86 | ||
1ed522b3 KK |
87 | ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data); |
88 | if (ret < 0) | |
89 | return ret; | |
87c2d906 KK |
90 | |
91 | data &= CHG_DETAILS_01_CHG_MASK; | |
92 | data >>= CHG_DETAILS_01_CHG_SHIFT; | |
93 | ||
94 | switch (data) { | |
95 | case MAX77693_CHARGING_PREQUALIFICATION: | |
96 | /* | |
97 | * Top-off: trickle or fast? In top-off the current varies between | |
98 | * 100 and 250 mA. It is higher than prequalification current. | |
99 | */ | |
100 | case MAX77693_CHARGING_TOP_OFF: | |
1ed522b3 | 101 | *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; |
87c2d906 KK |
102 | break; |
103 | case MAX77693_CHARGING_FAST_CONST_CURRENT: | |
104 | case MAX77693_CHARGING_FAST_CONST_VOLTAGE: | |
105 | /* In high temp the charging current is reduced, but still charging */ | |
106 | case MAX77693_CHARGING_HIGH_TEMP: | |
1ed522b3 | 107 | *val = POWER_SUPPLY_CHARGE_TYPE_FAST; |
87c2d906 KK |
108 | break; |
109 | case MAX77693_CHARGING_DONE: | |
110 | case MAX77693_CHARGING_TIMER_EXPIRED: | |
111 | case MAX77693_CHARGING_THERMISTOR_SUSPEND: | |
112 | case MAX77693_CHARGING_OFF: | |
113 | case MAX77693_CHARGING_OVER_TEMP: | |
114 | case MAX77693_CHARGING_WATCHDOG_EXPIRED: | |
1ed522b3 | 115 | *val = POWER_SUPPLY_CHARGE_TYPE_NONE; |
87c2d906 KK |
116 | break; |
117 | case MAX77693_CHARGING_RESERVED: | |
118 | default: | |
1ed522b3 | 119 | *val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; |
87c2d906 KK |
120 | } |
121 | ||
1ed522b3 | 122 | return 0; |
87c2d906 KK |
123 | } |
124 | ||
125 | /* | |
126 | * Supported health statuses: | |
127 | * - POWER_SUPPLY_HEALTH_DEAD | |
128 | * - POWER_SUPPLY_HEALTH_GOOD | |
129 | * - POWER_SUPPLY_HEALTH_OVERVOLTAGE | |
130 | * - POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE | |
131 | * - POWER_SUPPLY_HEALTH_UNKNOWN | |
132 | * - POWER_SUPPLY_HEALTH_UNSPEC_FAILURE | |
133 | */ | |
1ed522b3 | 134 | static int max77693_get_battery_health(struct regmap *regmap, int *val) |
87c2d906 | 135 | { |
1ed522b3 | 136 | int ret; |
87c2d906 KK |
137 | unsigned int data; |
138 | ||
1ed522b3 KK |
139 | ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data); |
140 | if (ret < 0) | |
141 | return ret; | |
87c2d906 KK |
142 | |
143 | data &= CHG_DETAILS_01_BAT_MASK; | |
144 | data >>= CHG_DETAILS_01_BAT_SHIFT; | |
145 | ||
146 | switch (data) { | |
147 | case MAX77693_BATTERY_NOBAT: | |
1ed522b3 | 148 | *val = POWER_SUPPLY_HEALTH_DEAD; |
87c2d906 KK |
149 | break; |
150 | case MAX77693_BATTERY_PREQUALIFICATION: | |
151 | case MAX77693_BATTERY_GOOD: | |
152 | case MAX77693_BATTERY_LOWVOLTAGE: | |
1ed522b3 | 153 | *val = POWER_SUPPLY_HEALTH_GOOD; |
87c2d906 KK |
154 | break; |
155 | case MAX77693_BATTERY_TIMER_EXPIRED: | |
156 | /* | |
157 | * Took longer to charge than expected, charging suspended. | |
158 | * Damaged battery? | |
159 | */ | |
1ed522b3 | 160 | *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; |
87c2d906 KK |
161 | break; |
162 | case MAX77693_BATTERY_OVERVOLTAGE: | |
1ed522b3 | 163 | *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE; |
87c2d906 KK |
164 | break; |
165 | case MAX77693_BATTERY_OVERCURRENT: | |
1ed522b3 | 166 | *val = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
87c2d906 KK |
167 | break; |
168 | case MAX77693_BATTERY_RESERVED: | |
169 | default: | |
1ed522b3 | 170 | *val = POWER_SUPPLY_HEALTH_UNKNOWN; |
87c2d906 KK |
171 | break; |
172 | } | |
173 | ||
1ed522b3 | 174 | return 0; |
87c2d906 KK |
175 | } |
176 | ||
1ed522b3 | 177 | static int max77693_get_present(struct regmap *regmap, int *val) |
87c2d906 KK |
178 | { |
179 | unsigned int data; | |
1ed522b3 | 180 | int ret; |
87c2d906 KK |
181 | |
182 | /* | |
183 | * Read CHG_INT_OK register. High DETBAT bit here should be | |
184 | * equal to value 0x0 in CHG_DETAILS_01/BAT field. | |
185 | */ | |
1ed522b3 KK |
186 | ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); |
187 | if (ret < 0) | |
188 | return ret; | |
189 | ||
190 | *val = (data & CHG_INT_OK_DETBAT_MASK) ? 0 : 1; | |
191 | ||
192 | return 0; | |
87c2d906 KK |
193 | } |
194 | ||
1ed522b3 | 195 | static int max77693_get_online(struct regmap *regmap, int *val) |
87c2d906 KK |
196 | { |
197 | unsigned int data; | |
1ed522b3 KK |
198 | int ret; |
199 | ||
200 | ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); | |
201 | if (ret < 0) | |
202 | return ret; | |
203 | ||
204 | *val = (data & CHG_INT_OK_CHGIN_MASK) ? 1 : 0; | |
87c2d906 | 205 | |
87c2d906 KK |
206 | return 0; |
207 | } | |
208 | ||
209 | static enum power_supply_property max77693_charger_props[] = { | |
210 | POWER_SUPPLY_PROP_STATUS, | |
211 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
212 | POWER_SUPPLY_PROP_HEALTH, | |
213 | POWER_SUPPLY_PROP_PRESENT, | |
214 | POWER_SUPPLY_PROP_ONLINE, | |
215 | POWER_SUPPLY_PROP_MODEL_NAME, | |
216 | POWER_SUPPLY_PROP_MANUFACTURER, | |
217 | }; | |
218 | ||
219 | static int max77693_charger_get_property(struct power_supply *psy, | |
220 | enum power_supply_property psp, | |
221 | union power_supply_propval *val) | |
222 | { | |
297d716f | 223 | struct max77693_charger *chg = power_supply_get_drvdata(psy); |
87c2d906 KK |
224 | struct regmap *regmap = chg->max77693->regmap; |
225 | int ret = 0; | |
226 | ||
227 | switch (psp) { | |
228 | case POWER_SUPPLY_PROP_STATUS: | |
1ed522b3 | 229 | ret = max77693_get_charger_state(regmap, &val->intval); |
87c2d906 KK |
230 | break; |
231 | case POWER_SUPPLY_PROP_CHARGE_TYPE: | |
1ed522b3 | 232 | ret = max77693_get_charge_type(regmap, &val->intval); |
87c2d906 KK |
233 | break; |
234 | case POWER_SUPPLY_PROP_HEALTH: | |
1ed522b3 | 235 | ret = max77693_get_battery_health(regmap, &val->intval); |
87c2d906 KK |
236 | break; |
237 | case POWER_SUPPLY_PROP_PRESENT: | |
1ed522b3 | 238 | ret = max77693_get_present(regmap, &val->intval); |
87c2d906 KK |
239 | break; |
240 | case POWER_SUPPLY_PROP_ONLINE: | |
1ed522b3 | 241 | ret = max77693_get_online(regmap, &val->intval); |
87c2d906 KK |
242 | break; |
243 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
244 | val->strval = max77693_charger_model; | |
245 | break; | |
246 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
247 | val->strval = max77693_charger_manufacturer; | |
248 | break; | |
249 | default: | |
250 | return -EINVAL; | |
251 | } | |
252 | ||
253 | return ret; | |
254 | } | |
255 | ||
297d716f KK |
256 | static const struct power_supply_desc max77693_charger_desc = { |
257 | .name = MAX77693_CHARGER_NAME, | |
258 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
259 | .properties = max77693_charger_props, | |
260 | .num_properties = ARRAY_SIZE(max77693_charger_props), | |
261 | .get_property = max77693_charger_get_property, | |
262 | }; | |
263 | ||
87c2d906 KK |
264 | static ssize_t device_attr_store(struct device *dev, |
265 | struct device_attribute *attr, const char *buf, size_t count, | |
266 | int (*fn)(struct max77693_charger *, unsigned long)) | |
267 | { | |
268 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
269 | unsigned long val; | |
270 | int ret; | |
271 | ||
272 | ret = kstrtoul(buf, 10, &val); | |
273 | if (ret) | |
274 | return ret; | |
275 | ||
276 | ret = fn(chg, val); | |
277 | if (ret) | |
278 | return ret; | |
279 | ||
280 | return count; | |
281 | } | |
282 | ||
283 | static ssize_t fast_charge_timer_show(struct device *dev, | |
284 | struct device_attribute *attr, char *buf) | |
285 | { | |
286 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
287 | unsigned int data, val; | |
288 | int ret; | |
289 | ||
290 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_01, | |
291 | &data); | |
292 | if (ret < 0) | |
293 | return ret; | |
294 | ||
295 | data &= CHG_CNFG_01_FCHGTIME_MASK; | |
296 | data >>= CHG_CNFG_01_FCHGTIME_SHIFT; | |
297 | switch (data) { | |
298 | case 0x1 ... 0x7: | |
299 | /* Starting from 4 hours, step by 2 hours */ | |
300 | val = 4 + (data - 1) * 2; | |
301 | break; | |
302 | case 0x0: | |
303 | default: | |
304 | val = 0; | |
305 | break; | |
306 | } | |
307 | ||
308 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
309 | } | |
310 | ||
311 | static int max77693_set_fast_charge_timer(struct max77693_charger *chg, | |
312 | unsigned long hours) | |
313 | { | |
314 | unsigned int data; | |
315 | ||
316 | /* | |
317 | * 0x00 - disable | |
318 | * 0x01 - 4h | |
319 | * 0x02 - 6h | |
320 | * ... | |
321 | * 0x07 - 16h | |
322 | * Round down odd values. | |
323 | */ | |
324 | switch (hours) { | |
325 | case 4 ... 16: | |
326 | data = (hours - 4) / 2 + 1; | |
327 | break; | |
328 | case 0: | |
329 | /* Disable */ | |
330 | data = 0; | |
331 | break; | |
332 | default: | |
333 | return -EINVAL; | |
334 | } | |
335 | data <<= CHG_CNFG_01_FCHGTIME_SHIFT; | |
336 | ||
337 | return regmap_update_bits(chg->max77693->regmap, | |
338 | MAX77693_CHG_REG_CHG_CNFG_01, | |
339 | CHG_CNFG_01_FCHGTIME_MASK, data); | |
340 | } | |
341 | ||
342 | static ssize_t fast_charge_timer_store(struct device *dev, | |
343 | struct device_attribute *attr, const char *buf, size_t count) | |
344 | { | |
345 | return device_attr_store(dev, attr, buf, count, | |
346 | max77693_set_fast_charge_timer); | |
347 | } | |
348 | ||
349 | static ssize_t top_off_threshold_current_show(struct device *dev, | |
350 | struct device_attribute *attr, char *buf) | |
351 | { | |
352 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
353 | unsigned int data, val; | |
354 | int ret; | |
355 | ||
356 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, | |
357 | &data); | |
358 | if (ret < 0) | |
359 | return ret; | |
360 | ||
361 | data &= CHG_CNFG_03_TOITH_MASK; | |
362 | data >>= CHG_CNFG_03_TOITH_SHIFT; | |
363 | ||
364 | if (data <= 0x04) | |
365 | val = 100000 + data * 25000; | |
366 | else | |
367 | val = data * 50000; | |
368 | ||
369 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
370 | } | |
371 | ||
372 | static int max77693_set_top_off_threshold_current(struct max77693_charger *chg, | |
373 | unsigned long uamp) | |
374 | { | |
375 | unsigned int data; | |
376 | ||
377 | if (uamp < 100000 || uamp > 350000) | |
378 | return -EINVAL; | |
379 | ||
380 | if (uamp <= 200000) | |
381 | data = (uamp - 100000) / 25000; | |
382 | else | |
383 | /* (200000, 350000> */ | |
384 | data = uamp / 50000; | |
385 | ||
386 | data <<= CHG_CNFG_03_TOITH_SHIFT; | |
387 | ||
388 | return regmap_update_bits(chg->max77693->regmap, | |
389 | MAX77693_CHG_REG_CHG_CNFG_03, | |
390 | CHG_CNFG_03_TOITH_MASK, data); | |
391 | } | |
392 | ||
393 | static ssize_t top_off_threshold_current_store(struct device *dev, | |
394 | struct device_attribute *attr, const char *buf, size_t count) | |
395 | { | |
396 | return device_attr_store(dev, attr, buf, count, | |
397 | max77693_set_top_off_threshold_current); | |
398 | } | |
399 | ||
400 | static ssize_t top_off_timer_show(struct device *dev, | |
401 | struct device_attribute *attr, char *buf) | |
402 | { | |
403 | struct max77693_charger *chg = dev_get_drvdata(dev); | |
404 | unsigned int data, val; | |
405 | int ret; | |
406 | ||
407 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, | |
408 | &data); | |
409 | if (ret < 0) | |
410 | return ret; | |
411 | ||
412 | data &= CHG_CNFG_03_TOTIME_MASK; | |
413 | data >>= CHG_CNFG_03_TOTIME_SHIFT; | |
414 | ||
415 | val = data * 10; | |
416 | ||
417 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
418 | } | |
419 | ||
420 | static int max77693_set_top_off_timer(struct max77693_charger *chg, | |
421 | unsigned long minutes) | |
422 | { | |
423 | unsigned int data; | |
424 | ||
425 | if (minutes > 70) | |
426 | return -EINVAL; | |
427 | ||
428 | data = minutes / 10; | |
429 | data <<= CHG_CNFG_03_TOTIME_SHIFT; | |
430 | ||
431 | return regmap_update_bits(chg->max77693->regmap, | |
432 | MAX77693_CHG_REG_CHG_CNFG_03, | |
433 | CHG_CNFG_03_TOTIME_MASK, data); | |
434 | } | |
435 | ||
436 | static ssize_t top_off_timer_store(struct device *dev, | |
437 | struct device_attribute *attr, const char *buf, size_t count) | |
438 | { | |
439 | return device_attr_store(dev, attr, buf, count, | |
440 | max77693_set_top_off_timer); | |
441 | } | |
442 | ||
443 | static DEVICE_ATTR_RW(fast_charge_timer); | |
444 | static DEVICE_ATTR_RW(top_off_threshold_current); | |
445 | static DEVICE_ATTR_RW(top_off_timer); | |
446 | ||
447 | static int max77693_set_constant_volt(struct max77693_charger *chg, | |
448 | unsigned int uvolt) | |
449 | { | |
450 | unsigned int data; | |
451 | ||
452 | /* | |
453 | * 0x00 - 3.650 V | |
454 | * 0x01 - 3.675 V | |
455 | * ... | |
456 | * 0x1b - 4.325 V | |
457 | * 0x1c - 4.340 V | |
458 | * 0x1d - 4.350 V | |
459 | * 0x1e - 4.375 V | |
460 | * 0x1f - 4.400 V | |
461 | */ | |
462 | if (uvolt >= 3650000 && uvolt < 4340000) | |
463 | data = (uvolt - 3650000) / 25000; | |
464 | else if (uvolt >= 4340000 && uvolt < 4350000) | |
465 | data = 0x1c; | |
466 | else if (uvolt >= 4350000 && uvolt <= 4400000) | |
467 | data = 0x1d + (uvolt - 4350000) / 25000; | |
468 | else { | |
469 | dev_err(chg->dev, "Wrong value for charging constant voltage\n"); | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
473 | data <<= CHG_CNFG_04_CHGCVPRM_SHIFT; | |
474 | ||
475 | dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt, | |
476 | data); | |
477 | ||
478 | return regmap_update_bits(chg->max77693->regmap, | |
479 | MAX77693_CHG_REG_CHG_CNFG_04, | |
480 | CHG_CNFG_04_CHGCVPRM_MASK, data); | |
481 | } | |
482 | ||
483 | static int max77693_set_min_system_volt(struct max77693_charger *chg, | |
484 | unsigned int uvolt) | |
485 | { | |
486 | unsigned int data; | |
487 | ||
488 | if (uvolt < 3000000 || uvolt > 3700000) { | |
489 | dev_err(chg->dev, "Wrong value for minimum system regulation voltage\n"); | |
490 | return -EINVAL; | |
491 | } | |
492 | ||
493 | data = (uvolt - 3000000) / 100000; | |
494 | ||
495 | data <<= CHG_CNFG_04_MINVSYS_SHIFT; | |
496 | ||
497 | dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n", | |
498 | uvolt, data); | |
499 | ||
500 | return regmap_update_bits(chg->max77693->regmap, | |
501 | MAX77693_CHG_REG_CHG_CNFG_04, | |
502 | CHG_CNFG_04_MINVSYS_MASK, data); | |
503 | } | |
504 | ||
505 | static int max77693_set_thermal_regulation_temp(struct max77693_charger *chg, | |
506 | unsigned int cels) | |
507 | { | |
508 | unsigned int data; | |
509 | ||
510 | switch (cels) { | |
511 | case 70: | |
512 | case 85: | |
513 | case 100: | |
514 | case 115: | |
515 | data = (cels - 70) / 15; | |
516 | break; | |
517 | default: | |
518 | dev_err(chg->dev, "Wrong value for thermal regulation loop temperature\n"); | |
519 | return -EINVAL; | |
520 | } | |
521 | ||
522 | data <<= CHG_CNFG_07_REGTEMP_SHIFT; | |
523 | ||
524 | dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n", | |
525 | cels, data); | |
526 | ||
527 | return regmap_update_bits(chg->max77693->regmap, | |
528 | MAX77693_CHG_REG_CHG_CNFG_07, | |
529 | CHG_CNFG_07_REGTEMP_MASK, data); | |
530 | } | |
531 | ||
532 | static int max77693_set_batttery_overcurrent(struct max77693_charger *chg, | |
533 | unsigned int uamp) | |
534 | { | |
535 | unsigned int data; | |
536 | ||
537 | if (uamp && (uamp < 2000000 || uamp > 3500000)) { | |
538 | dev_err(chg->dev, "Wrong value for battery overcurrent\n"); | |
539 | return -EINVAL; | |
540 | } | |
541 | ||
542 | if (uamp) | |
543 | data = ((uamp - 2000000) / 250000) + 1; | |
544 | else | |
545 | data = 0; /* disable */ | |
546 | ||
547 | data <<= CHG_CNFG_12_B2SOVRC_SHIFT; | |
548 | ||
549 | dev_dbg(chg->dev, "Battery overcurrent: %u (0x%x)\n", uamp, data); | |
550 | ||
551 | return regmap_update_bits(chg->max77693->regmap, | |
552 | MAX77693_CHG_REG_CHG_CNFG_12, | |
553 | CHG_CNFG_12_B2SOVRC_MASK, data); | |
554 | } | |
555 | ||
556 | static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg, | |
557 | unsigned int uvolt) | |
558 | { | |
559 | unsigned int data; | |
560 | ||
561 | switch (uvolt) { | |
562 | case 4300000: | |
563 | data = 0x0; | |
564 | break; | |
565 | case 4700000: | |
566 | case 4800000: | |
567 | case 4900000: | |
568 | data = (uvolt - 4700000) / 100000; | |
569 | default: | |
570 | dev_err(chg->dev, "Wrong value for charge input voltage regulation threshold\n"); | |
571 | return -EINVAL; | |
572 | } | |
573 | ||
574 | data <<= CHG_CNFG_12_VCHGINREG_SHIFT; | |
575 | ||
576 | dev_dbg(chg->dev, "Charge input voltage regulation threshold: %u (0x%x)\n", | |
577 | uvolt, data); | |
578 | ||
579 | return regmap_update_bits(chg->max77693->regmap, | |
580 | MAX77693_CHG_REG_CHG_CNFG_12, | |
581 | CHG_CNFG_12_VCHGINREG_MASK, data); | |
582 | } | |
583 | ||
584 | /* | |
585 | * Sets charger registers to proper and safe default values. | |
586 | */ | |
587 | static int max77693_reg_init(struct max77693_charger *chg) | |
588 | { | |
589 | int ret; | |
590 | unsigned int data; | |
591 | ||
592 | /* Unlock charger register protection */ | |
593 | data = (0x3 << CHG_CNFG_06_CHGPROT_SHIFT); | |
594 | ret = regmap_update_bits(chg->max77693->regmap, | |
595 | MAX77693_CHG_REG_CHG_CNFG_06, | |
596 | CHG_CNFG_06_CHGPROT_MASK, data); | |
597 | if (ret) { | |
598 | dev_err(chg->dev, "Error unlocking registers: %d\n", ret); | |
599 | return ret; | |
600 | } | |
601 | ||
602 | ret = max77693_set_fast_charge_timer(chg, DEFAULT_FAST_CHARGE_TIMER); | |
603 | if (ret) | |
604 | return ret; | |
605 | ||
606 | ret = max77693_set_top_off_threshold_current(chg, | |
607 | DEFAULT_TOP_OFF_THRESHOLD_CURRENT); | |
608 | if (ret) | |
609 | return ret; | |
610 | ||
611 | ret = max77693_set_top_off_timer(chg, DEFAULT_TOP_OFF_TIMER); | |
612 | if (ret) | |
613 | return ret; | |
614 | ||
615 | ret = max77693_set_constant_volt(chg, chg->constant_volt); | |
616 | if (ret) | |
617 | return ret; | |
618 | ||
619 | ret = max77693_set_min_system_volt(chg, chg->min_system_volt); | |
620 | if (ret) | |
621 | return ret; | |
622 | ||
623 | ret = max77693_set_thermal_regulation_temp(chg, | |
624 | chg->thermal_regulation_temp); | |
625 | if (ret) | |
626 | return ret; | |
627 | ||
628 | ret = max77693_set_batttery_overcurrent(chg, chg->batttery_overcurrent); | |
629 | if (ret) | |
630 | return ret; | |
631 | ||
5b40b3e6 | 632 | return max77693_set_charge_input_threshold_volt(chg, |
87c2d906 | 633 | chg->charge_input_threshold_volt); |
87c2d906 KK |
634 | } |
635 | ||
636 | #ifdef CONFIG_OF | |
637 | static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) | |
638 | { | |
639 | struct device_node *np = dev->of_node; | |
640 | ||
641 | if (!np) { | |
642 | dev_err(dev, "no charger OF node\n"); | |
643 | return -EINVAL; | |
644 | } | |
645 | ||
646 | if (of_property_read_u32(np, "maxim,constant-microvolt", | |
647 | &chg->constant_volt)) | |
648 | chg->constant_volt = DEFAULT_CONSTANT_VOLT; | |
649 | ||
650 | if (of_property_read_u32(np, "maxim,min-system-microvolt", | |
651 | &chg->min_system_volt)) | |
652 | chg->min_system_volt = DEFAULT_MIN_SYSTEM_VOLT; | |
653 | ||
654 | if (of_property_read_u32(np, "maxim,thermal-regulation-celsius", | |
655 | &chg->thermal_regulation_temp)) | |
656 | chg->thermal_regulation_temp = DEFAULT_THERMAL_REGULATION_TEMP; | |
657 | ||
658 | if (of_property_read_u32(np, "maxim,battery-overcurrent-microamp", | |
659 | &chg->batttery_overcurrent)) | |
660 | chg->batttery_overcurrent = DEFAULT_BATTERY_OVERCURRENT; | |
661 | ||
662 | if (of_property_read_u32(np, "maxim,charge-input-threshold-microvolt", | |
663 | &chg->charge_input_threshold_volt)) | |
664 | chg->charge_input_threshold_volt = | |
665 | DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT; | |
666 | ||
667 | return 0; | |
668 | } | |
669 | #else /* CONFIG_OF */ | |
670 | static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) | |
671 | { | |
672 | return 0; | |
673 | } | |
674 | #endif /* CONFIG_OF */ | |
675 | ||
676 | static int max77693_charger_probe(struct platform_device *pdev) | |
677 | { | |
678 | struct max77693_charger *chg; | |
297d716f | 679 | struct power_supply_config psy_cfg = {}; |
87c2d906 KK |
680 | struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent); |
681 | int ret; | |
682 | ||
683 | chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL); | |
684 | if (!chg) | |
685 | return -ENOMEM; | |
686 | ||
687 | platform_set_drvdata(pdev, chg); | |
688 | chg->dev = &pdev->dev; | |
689 | chg->max77693 = max77693; | |
690 | ||
691 | ret = max77693_dt_init(&pdev->dev, chg); | |
692 | if (ret) | |
693 | return ret; | |
694 | ||
695 | ret = max77693_reg_init(chg); | |
696 | if (ret) | |
697 | return ret; | |
698 | ||
297d716f | 699 | psy_cfg.drv_data = chg; |
87c2d906 KK |
700 | |
701 | ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer); | |
702 | if (ret) { | |
703 | dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n"); | |
704 | goto err; | |
705 | } | |
706 | ||
707 | ret = device_create_file(&pdev->dev, | |
708 | &dev_attr_top_off_threshold_current); | |
709 | if (ret) { | |
710 | dev_err(&pdev->dev, "failed: create top off current sysfs entry\n"); | |
711 | goto err; | |
712 | } | |
713 | ||
714 | ret = device_create_file(&pdev->dev, &dev_attr_top_off_timer); | |
715 | if (ret) { | |
716 | dev_err(&pdev->dev, "failed: create top off timer sysfs entry\n"); | |
717 | goto err; | |
718 | } | |
719 | ||
297d716f KK |
720 | chg->charger = power_supply_register(&pdev->dev, |
721 | &max77693_charger_desc, | |
722 | &psy_cfg); | |
723 | if (IS_ERR(chg->charger)) { | |
87c2d906 | 724 | dev_err(&pdev->dev, "failed: power supply register\n"); |
297d716f | 725 | ret = PTR_ERR(chg->charger); |
87c2d906 KK |
726 | goto err; |
727 | } | |
728 | ||
729 | return 0; | |
730 | ||
731 | err: | |
732 | device_remove_file(&pdev->dev, &dev_attr_top_off_timer); | |
733 | device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); | |
734 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); | |
735 | ||
736 | return ret; | |
737 | } | |
738 | ||
739 | static int max77693_charger_remove(struct platform_device *pdev) | |
740 | { | |
741 | struct max77693_charger *chg = platform_get_drvdata(pdev); | |
742 | ||
743 | device_remove_file(&pdev->dev, &dev_attr_top_off_timer); | |
744 | device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); | |
745 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); | |
746 | ||
297d716f | 747 | power_supply_unregister(chg->charger); |
87c2d906 KK |
748 | |
749 | return 0; | |
750 | } | |
751 | ||
752 | static const struct platform_device_id max77693_charger_id[] = { | |
753 | { "max77693-charger", 0, }, | |
754 | { } | |
755 | }; | |
756 | MODULE_DEVICE_TABLE(platform, max77693_charger_id); | |
757 | ||
758 | static struct platform_driver max77693_charger_driver = { | |
759 | .driver = { | |
87c2d906 KK |
760 | .name = "max77693-charger", |
761 | }, | |
762 | .probe = max77693_charger_probe, | |
763 | .remove = max77693_charger_remove, | |
764 | .id_table = max77693_charger_id, | |
765 | }; | |
766 | module_platform_driver(max77693_charger_driver); | |
767 | ||
768 | MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); | |
769 | MODULE_DESCRIPTION("Maxim 77693 charger driver"); | |
770 | MODULE_LICENSE("GPL"); |