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55e64701 | 1 | /* |
3682a8ee | 2 | * max14577_charger.c - Battery charger driver for the Maxim 14577/77836 |
55e64701 | 3 | * |
3682a8ee | 4 | * Copyright (C) 2013,2014 Samsung Electronics |
55e64701 KK |
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/mfd/max14577-private.h> | |
e30110e9 | 22 | #include <linux/mfd/max14577.h> |
55e64701 KK |
23 | |
24 | struct max14577_charger { | |
297d716f KK |
25 | struct device *dev; |
26 | struct max14577 *max14577; | |
27 | struct power_supply *charger; | |
55e64701 | 28 | |
e30110e9 | 29 | struct max14577_charger_platform_data *pdata; |
55e64701 KK |
30 | }; |
31 | ||
3682a8ee KK |
32 | /* |
33 | * Helper function for mapping values of STATUS2/CHGTYP register on max14577 | |
34 | * and max77836 chipsets to enum maxim_muic_charger_type. | |
35 | */ | |
36 | static enum max14577_muic_charger_type maxim_get_charger_type( | |
37 | enum maxim_device_type dev_type, u8 val) { | |
38 | switch (val) { | |
39 | case MAX14577_CHARGER_TYPE_NONE: | |
40 | case MAX14577_CHARGER_TYPE_USB: | |
41 | case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: | |
42 | case MAX14577_CHARGER_TYPE_DEDICATED_CHG: | |
43 | case MAX14577_CHARGER_TYPE_SPECIAL_500MA: | |
44 | case MAX14577_CHARGER_TYPE_SPECIAL_1A: | |
45 | return val; | |
46 | case MAX14577_CHARGER_TYPE_DEAD_BATTERY: | |
47 | case MAX14577_CHARGER_TYPE_RESERVED: | |
48 | if (dev_type == MAXIM_DEVICE_TYPE_MAX77836) | |
49 | val |= 0x8; | |
50 | return val; | |
51 | default: | |
52 | WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val); | |
53 | return val; | |
54 | } | |
55 | } | |
56 | ||
dd18a663 | 57 | static int max14577_get_charger_state(struct max14577_charger *chg, int *val) |
55e64701 KK |
58 | { |
59 | struct regmap *rmap = chg->max14577->regmap; | |
dd18a663 | 60 | int ret; |
55e64701 KK |
61 | u8 reg_data; |
62 | ||
63 | /* | |
64 | * Charging occurs only if: | |
65 | * - CHGCTRL2/MBCHOSTEN == 1 | |
66 | * - STATUS2/CGMBC == 1 | |
67 | * | |
68 | * TODO: | |
69 | * - handle FULL after Top-off timer (EOC register may be off | |
70 | * and the charger won't be charging although MBCHOSTEN is on) | |
71 | * - handle properly dead-battery charging (respect timer) | |
72 | * - handle timers (fast-charge and prequal) /MBCCHGERR/ | |
73 | */ | |
dd18a663 KK |
74 | ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); |
75 | if (ret < 0) | |
76 | goto out; | |
77 | ||
78 | if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) { | |
79 | *val = POWER_SUPPLY_STATUS_DISCHARGING; | |
80 | goto out; | |
81 | } | |
82 | ||
83 | ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); | |
84 | if (ret < 0) | |
85 | goto out; | |
55e64701 | 86 | |
55e64701 KK |
87 | if (reg_data & STATUS3_CGMBC_MASK) { |
88 | /* Charger or USB-cable is connected */ | |
89 | if (reg_data & STATUS3_EOC_MASK) | |
dd18a663 | 90 | *val = POWER_SUPPLY_STATUS_FULL; |
55e64701 | 91 | else |
dd18a663 KK |
92 | *val = POWER_SUPPLY_STATUS_CHARGING; |
93 | goto out; | |
55e64701 KK |
94 | } |
95 | ||
dd18a663 KK |
96 | *val = POWER_SUPPLY_STATUS_DISCHARGING; |
97 | ||
98 | out: | |
99 | return ret; | |
55e64701 KK |
100 | } |
101 | ||
102 | /* | |
103 | * Supported charge types: | |
104 | * - POWER_SUPPLY_CHARGE_TYPE_NONE | |
105 | * - POWER_SUPPLY_CHARGE_TYPE_FAST | |
106 | */ | |
dd18a663 | 107 | static int max14577_get_charge_type(struct max14577_charger *chg, int *val) |
55e64701 | 108 | { |
dd18a663 KK |
109 | int ret, charging; |
110 | ||
55e64701 KK |
111 | /* |
112 | * TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)? | |
113 | * As spec says: | |
114 | * [after reaching EOC interrupt] | |
115 | * "When the battery is fully charged, the 30-minute (typ) | |
116 | * top-off timer starts. The device continues to trickle | |
117 | * charge the battery until the top-off timer runs out." | |
118 | */ | |
dd18a663 KK |
119 | ret = max14577_get_charger_state(chg, &charging); |
120 | if (ret < 0) | |
121 | return ret; | |
122 | ||
123 | if (charging == POWER_SUPPLY_STATUS_CHARGING) | |
124 | *val = POWER_SUPPLY_CHARGE_TYPE_FAST; | |
125 | else | |
126 | *val = POWER_SUPPLY_CHARGE_TYPE_NONE; | |
127 | ||
128 | return 0; | |
55e64701 KK |
129 | } |
130 | ||
dd18a663 | 131 | static int max14577_get_online(struct max14577_charger *chg, int *val) |
55e64701 KK |
132 | { |
133 | struct regmap *rmap = chg->max14577->regmap; | |
134 | u8 reg_data; | |
dd18a663 | 135 | int ret; |
3682a8ee | 136 | enum max14577_muic_charger_type chg_type; |
55e64701 | 137 | |
dd18a663 KK |
138 | ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data); |
139 | if (ret < 0) | |
140 | return ret; | |
141 | ||
55e64701 | 142 | reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT); |
3682a8ee KK |
143 | chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data); |
144 | switch (chg_type) { | |
55e64701 KK |
145 | case MAX14577_CHARGER_TYPE_USB: |
146 | case MAX14577_CHARGER_TYPE_DEDICATED_CHG: | |
147 | case MAX14577_CHARGER_TYPE_SPECIAL_500MA: | |
148 | case MAX14577_CHARGER_TYPE_SPECIAL_1A: | |
149 | case MAX14577_CHARGER_TYPE_DEAD_BATTERY: | |
3682a8ee | 150 | case MAX77836_CHARGER_TYPE_SPECIAL_BIAS: |
dd18a663 KK |
151 | *val = 1; |
152 | break; | |
55e64701 KK |
153 | case MAX14577_CHARGER_TYPE_NONE: |
154 | case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT: | |
155 | case MAX14577_CHARGER_TYPE_RESERVED: | |
3682a8ee | 156 | case MAX77836_CHARGER_TYPE_RESERVED: |
55e64701 | 157 | default: |
dd18a663 | 158 | *val = 0; |
55e64701 | 159 | } |
dd18a663 KK |
160 | |
161 | return 0; | |
55e64701 KK |
162 | } |
163 | ||
164 | /* | |
165 | * Supported health statuses: | |
166 | * - POWER_SUPPLY_HEALTH_DEAD | |
167 | * - POWER_SUPPLY_HEALTH_OVERVOLTAGE | |
168 | * - POWER_SUPPLY_HEALTH_GOOD | |
169 | */ | |
dd18a663 | 170 | static int max14577_get_battery_health(struct max14577_charger *chg, int *val) |
55e64701 KK |
171 | { |
172 | struct regmap *rmap = chg->max14577->regmap; | |
dd18a663 | 173 | int ret; |
55e64701 | 174 | u8 reg_data; |
3682a8ee | 175 | enum max14577_muic_charger_type chg_type; |
55e64701 | 176 | |
dd18a663 KK |
177 | ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data); |
178 | if (ret < 0) | |
179 | goto out; | |
180 | ||
55e64701 | 181 | reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT); |
3682a8ee KK |
182 | chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data); |
183 | if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) { | |
dd18a663 KK |
184 | *val = POWER_SUPPLY_HEALTH_DEAD; |
185 | goto out; | |
55e64701 KK |
186 | } |
187 | ||
dd18a663 KK |
188 | ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); |
189 | if (ret < 0) | |
190 | goto out; | |
191 | ||
55e64701 | 192 | if (reg_data & STATUS3_OVP_MASK) { |
dd18a663 KK |
193 | *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE; |
194 | goto out; | |
55e64701 KK |
195 | } |
196 | ||
dd18a663 KK |
197 | /* Not dead, not overvoltage */ |
198 | *val = POWER_SUPPLY_HEALTH_GOOD; | |
199 | ||
200 | out: | |
201 | return ret; | |
55e64701 KK |
202 | } |
203 | ||
204 | /* | |
205 | * Always returns 1. | |
206 | * The max14577 chip doesn't report any status of battery presence. | |
207 | * Lets assume that it will always be used with some battery. | |
208 | */ | |
dd18a663 | 209 | static int max14577_get_present(struct max14577_charger *chg, int *val) |
55e64701 | 210 | { |
dd18a663 KK |
211 | *val = 1; |
212 | ||
213 | return 0; | |
55e64701 KK |
214 | } |
215 | ||
e30110e9 KK |
216 | static int max14577_set_fast_charge_timer(struct max14577_charger *chg, |
217 | unsigned long hours) | |
218 | { | |
219 | u8 reg_data; | |
220 | ||
221 | switch (hours) { | |
222 | case 5 ... 7: | |
223 | reg_data = hours - 3; | |
224 | break; | |
225 | case 0: | |
226 | /* Disable */ | |
227 | reg_data = 0x7; | |
228 | break; | |
229 | default: | |
230 | dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n", | |
231 | hours); | |
232 | return -EINVAL; | |
233 | } | |
234 | reg_data <<= CHGCTRL1_TCHW_SHIFT; | |
235 | ||
236 | return max14577_update_reg(chg->max14577->regmap, | |
237 | MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data); | |
238 | } | |
239 | ||
240 | static int max14577_init_constant_voltage(struct max14577_charger *chg, | |
241 | unsigned int uvolt) | |
242 | { | |
243 | u8 reg_data; | |
244 | ||
245 | if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN || | |
246 | uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX) | |
247 | return -EINVAL; | |
248 | ||
249 | if (uvolt == 4200000) | |
250 | reg_data = 0x0; | |
251 | else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX) | |
252 | reg_data = 0x1f; | |
253 | else if (uvolt <= 4280000) { | |
254 | unsigned int val = uvolt; | |
255 | ||
256 | val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN; | |
257 | val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP; | |
258 | if (uvolt <= 4180000) | |
259 | reg_data = 0x1 + val; | |
260 | else | |
261 | reg_data = val; /* Fix for gap between 4.18V and 4.22V */ | |
262 | } else | |
263 | return -EINVAL; | |
264 | ||
265 | reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT; | |
266 | ||
267 | return max14577_write_reg(chg->max14577->regmap, | |
268 | MAX14577_CHG_REG_CHG_CTRL3, reg_data); | |
269 | } | |
270 | ||
271 | static int max14577_init_eoc(struct max14577_charger *chg, | |
272 | unsigned int uamp) | |
273 | { | |
274 | unsigned int current_bits = 0xf; | |
275 | u8 reg_data; | |
276 | ||
277 | switch (chg->max14577->dev_type) { | |
278 | case MAXIM_DEVICE_TYPE_MAX77836: | |
279 | if (uamp < 5000) | |
280 | return -EINVAL; /* Requested current is too low */ | |
281 | ||
282 | if (uamp >= 7500 && uamp < 10000) | |
283 | current_bits = 0x0; | |
284 | else if (uamp <= 50000) { | |
285 | /* <5000, 7499> and <10000, 50000> */ | |
286 | current_bits = uamp / 5000; | |
287 | } else { | |
288 | uamp = min(uamp, 100000U) - 50000U; | |
289 | current_bits = 0xa + uamp / 10000; | |
290 | } | |
291 | break; | |
292 | ||
293 | case MAXIM_DEVICE_TYPE_MAX14577: | |
294 | default: | |
295 | if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN) | |
296 | return -EINVAL; /* Requested current is too low */ | |
297 | ||
298 | uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX); | |
299 | uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN; | |
300 | current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP; | |
301 | break; | |
302 | } | |
303 | ||
304 | reg_data = current_bits << CHGCTRL5_EOCS_SHIFT; | |
305 | ||
306 | return max14577_update_reg(chg->max14577->regmap, | |
307 | MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK, | |
308 | reg_data); | |
309 | } | |
310 | ||
311 | static int max14577_init_fast_charge(struct max14577_charger *chg, | |
312 | unsigned int uamp) | |
313 | { | |
314 | u8 reg_data; | |
315 | int ret; | |
316 | const struct maxim_charger_current *limits = | |
317 | &maxim_charger_currents[chg->max14577->dev_type]; | |
318 | ||
319 | ret = maxim_charger_calc_reg_current(limits, uamp, uamp, ®_data); | |
320 | if (ret) { | |
321 | dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp); | |
322 | return ret; | |
323 | } | |
324 | ||
325 | return max14577_update_reg(chg->max14577->regmap, | |
326 | MAX14577_CHG_REG_CHG_CTRL4, | |
327 | CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, | |
328 | reg_data); | |
329 | } | |
330 | ||
55e64701 KK |
331 | /* |
332 | * Sets charger registers to proper and safe default values. | |
333 | * Some of these values are equal to defaults in MAX14577E | |
334 | * data sheet but there are minor differences. | |
335 | */ | |
e30110e9 | 336 | static int max14577_charger_reg_init(struct max14577_charger *chg) |
55e64701 KK |
337 | { |
338 | struct regmap *rmap = chg->max14577->regmap; | |
339 | u8 reg_data; | |
e30110e9 | 340 | int ret; |
55e64701 KK |
341 | |
342 | /* | |
343 | * Charger-Type Manual Detection, default off (set CHGTYPMAN to 0) | |
344 | * Charger-Detection Enable, default on (set CHGDETEN to 1) | |
345 | * Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit | |
346 | */ | |
347 | reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT; | |
348 | max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1, | |
349 | CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK, | |
350 | reg_data); | |
351 | ||
55e64701 KK |
352 | /* |
353 | * Wall-Adapter Rapid Charge, default on | |
354 | * Battery-Charger, default on | |
355 | */ | |
356 | reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT; | |
357 | reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT; | |
358 | max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data); | |
359 | ||
55e64701 KK |
360 | /* Auto Charging Stop, default off */ |
361 | reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT; | |
362 | max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data); | |
363 | ||
e30110e9 KK |
364 | ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt); |
365 | if (ret) | |
366 | return ret; | |
367 | ||
368 | ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp); | |
369 | if (ret) | |
370 | return ret; | |
371 | ||
372 | ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp); | |
373 | if (ret) | |
374 | return ret; | |
375 | ||
376 | ret = max14577_set_fast_charge_timer(chg, | |
377 | MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT); | |
378 | if (ret) | |
379 | return ret; | |
380 | ||
381 | /* Initialize Overvoltage-Protection Threshold */ | |
382 | switch (chg->pdata->ovp_uvolt) { | |
383 | case 7500000: | |
384 | reg_data = 0x0; | |
385 | break; | |
386 | case 6000000: | |
387 | case 6500000: | |
388 | case 7000000: | |
389 | reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000; | |
390 | break; | |
391 | default: | |
392 | dev_err(chg->dev, "Wrong value for OVP: %u\n", | |
393 | chg->pdata->ovp_uvolt); | |
394 | return -EINVAL; | |
395 | } | |
396 | reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT; | |
55e64701 | 397 | max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data); |
e30110e9 KK |
398 | |
399 | return 0; | |
55e64701 KK |
400 | } |
401 | ||
402 | /* Support property from charger */ | |
403 | static enum power_supply_property max14577_charger_props[] = { | |
404 | POWER_SUPPLY_PROP_STATUS, | |
405 | POWER_SUPPLY_PROP_CHARGE_TYPE, | |
406 | POWER_SUPPLY_PROP_HEALTH, | |
407 | POWER_SUPPLY_PROP_PRESENT, | |
408 | POWER_SUPPLY_PROP_ONLINE, | |
409 | POWER_SUPPLY_PROP_MODEL_NAME, | |
410 | POWER_SUPPLY_PROP_MANUFACTURER, | |
411 | }; | |
412 | ||
3682a8ee KK |
413 | static const char * const model_names[] = { |
414 | [MAXIM_DEVICE_TYPE_UNKNOWN] = "MAX14577-like", | |
415 | [MAXIM_DEVICE_TYPE_MAX14577] = "MAX14577", | |
416 | [MAXIM_DEVICE_TYPE_MAX77836] = "MAX77836", | |
417 | }; | |
55e64701 KK |
418 | static const char *manufacturer = "Maxim Integrated"; |
419 | ||
420 | static int max14577_charger_get_property(struct power_supply *psy, | |
421 | enum power_supply_property psp, | |
422 | union power_supply_propval *val) | |
423 | { | |
297d716f | 424 | struct max14577_charger *chg = power_supply_get_drvdata(psy); |
55e64701 KK |
425 | int ret = 0; |
426 | ||
427 | switch (psp) { | |
428 | case POWER_SUPPLY_PROP_STATUS: | |
dd18a663 | 429 | ret = max14577_get_charger_state(chg, &val->intval); |
55e64701 KK |
430 | break; |
431 | case POWER_SUPPLY_PROP_CHARGE_TYPE: | |
dd18a663 | 432 | ret = max14577_get_charge_type(chg, &val->intval); |
55e64701 KK |
433 | break; |
434 | case POWER_SUPPLY_PROP_HEALTH: | |
dd18a663 | 435 | ret = max14577_get_battery_health(chg, &val->intval); |
55e64701 KK |
436 | break; |
437 | case POWER_SUPPLY_PROP_PRESENT: | |
dd18a663 | 438 | ret = max14577_get_present(chg, &val->intval); |
55e64701 KK |
439 | break; |
440 | case POWER_SUPPLY_PROP_ONLINE: | |
dd18a663 | 441 | ret = max14577_get_online(chg, &val->intval); |
55e64701 KK |
442 | break; |
443 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
3682a8ee KK |
444 | BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM); |
445 | val->strval = model_names[chg->max14577->dev_type]; | |
55e64701 KK |
446 | break; |
447 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
448 | val->strval = manufacturer; | |
449 | break; | |
450 | default: | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
454 | return ret; | |
455 | } | |
456 | ||
297d716f KK |
457 | static const struct power_supply_desc max14577_charger_desc = { |
458 | .name = "max14577-charger", | |
459 | .type = POWER_SUPPLY_TYPE_BATTERY, | |
460 | .properties = max14577_charger_props, | |
461 | .num_properties = ARRAY_SIZE(max14577_charger_props), | |
462 | .get_property = max14577_charger_get_property, | |
463 | }; | |
464 | ||
e30110e9 KK |
465 | #ifdef CONFIG_OF |
466 | static struct max14577_charger_platform_data *max14577_charger_dt_init( | |
467 | struct platform_device *pdev) | |
468 | { | |
469 | struct max14577_charger_platform_data *pdata; | |
470 | struct device_node *np = pdev->dev.of_node; | |
471 | int ret; | |
472 | ||
473 | if (!np) { | |
474 | dev_err(&pdev->dev, "No charger OF node\n"); | |
475 | return ERR_PTR(-EINVAL); | |
476 | } | |
477 | ||
478 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
479 | if (!pdata) | |
480 | return ERR_PTR(-ENOMEM); | |
481 | ||
482 | ret = of_property_read_u32(np, "maxim,constant-uvolt", | |
483 | &pdata->constant_uvolt); | |
484 | if (ret) { | |
485 | dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n"); | |
486 | return ERR_PTR(ret); | |
487 | } | |
488 | ||
489 | ret = of_property_read_u32(np, "maxim,fast-charge-uamp", | |
490 | &pdata->fast_charge_uamp); | |
491 | if (ret) { | |
492 | dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n"); | |
493 | return ERR_PTR(ret); | |
494 | } | |
495 | ||
496 | ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp); | |
497 | if (ret) { | |
498 | dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n"); | |
499 | return ERR_PTR(ret); | |
500 | } | |
501 | ||
502 | ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt); | |
503 | if (ret) { | |
504 | dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n"); | |
505 | return ERR_PTR(ret); | |
506 | } | |
507 | ||
508 | return pdata; | |
509 | } | |
510 | #else /* CONFIG_OF */ | |
511 | static struct max14577_charger_platform_data *max14577_charger_dt_init( | |
512 | struct platform_device *pdev) | |
513 | { | |
514 | return NULL; | |
515 | } | |
516 | #endif /* CONFIG_OF */ | |
517 | ||
518 | static ssize_t show_fast_charge_timer(struct device *dev, | |
519 | struct device_attribute *attr, char *buf) | |
520 | { | |
521 | struct max14577_charger *chg = dev_get_drvdata(dev); | |
522 | u8 reg_data; | |
523 | int ret; | |
524 | unsigned int val; | |
525 | ||
526 | ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1, | |
527 | ®_data); | |
528 | if (ret) | |
529 | return ret; | |
530 | ||
531 | reg_data &= CHGCTRL1_TCHW_MASK; | |
532 | reg_data >>= CHGCTRL1_TCHW_SHIFT; | |
533 | switch (reg_data) { | |
534 | case 0x2 ... 0x4: | |
535 | val = reg_data + 3; | |
536 | break; | |
537 | case 0x7: | |
538 | val = 0; | |
539 | break; | |
540 | default: | |
541 | val = 5; | |
542 | break; | |
543 | } | |
544 | ||
545 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); | |
546 | } | |
547 | ||
548 | static ssize_t store_fast_charge_timer(struct device *dev, | |
549 | struct device_attribute *attr, const char *buf, size_t count) | |
550 | { | |
551 | struct max14577_charger *chg = dev_get_drvdata(dev); | |
552 | unsigned long val; | |
553 | int ret; | |
554 | ||
555 | ret = kstrtoul(buf, 10, &val); | |
556 | if (ret) | |
557 | return ret; | |
558 | ||
559 | ret = max14577_set_fast_charge_timer(chg, val); | |
560 | if (ret) | |
561 | return ret; | |
562 | ||
563 | return count; | |
564 | } | |
565 | ||
566 | static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR, | |
567 | show_fast_charge_timer, store_fast_charge_timer); | |
568 | ||
55e64701 KK |
569 | static int max14577_charger_probe(struct platform_device *pdev) |
570 | { | |
571 | struct max14577_charger *chg; | |
297d716f | 572 | struct power_supply_config psy_cfg = {}; |
55e64701 KK |
573 | struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); |
574 | int ret; | |
575 | ||
576 | chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL); | |
577 | if (!chg) | |
578 | return -ENOMEM; | |
579 | ||
580 | platform_set_drvdata(pdev, chg); | |
581 | chg->dev = &pdev->dev; | |
582 | chg->max14577 = max14577; | |
583 | ||
e30110e9 KK |
584 | chg->pdata = max14577_charger_dt_init(pdev); |
585 | if (IS_ERR_OR_NULL(chg->pdata)) | |
586 | return PTR_ERR(chg->pdata); | |
587 | ||
588 | ret = max14577_charger_reg_init(chg); | |
589 | if (ret) | |
590 | return ret; | |
55e64701 | 591 | |
e30110e9 KK |
592 | ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer); |
593 | if (ret) { | |
594 | dev_err(&pdev->dev, "failed: create sysfs entry\n"); | |
595 | return ret; | |
596 | } | |
597 | ||
297d716f KK |
598 | psy_cfg.drv_data = chg; |
599 | chg->charger = power_supply_register(&pdev->dev, &max14577_charger_desc, | |
600 | &psy_cfg); | |
601 | if (IS_ERR(chg->charger)) { | |
55e64701 | 602 | dev_err(&pdev->dev, "failed: power supply register\n"); |
297d716f | 603 | ret = PTR_ERR(chg->charger); |
e30110e9 | 604 | goto err; |
55e64701 KK |
605 | } |
606 | ||
e30110e9 KK |
607 | /* Check for valid values for charger */ |
608 | BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN + | |
609 | MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf != | |
610 | MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX); | |
55e64701 | 611 | return 0; |
e30110e9 KK |
612 | |
613 | err: | |
614 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); | |
615 | ||
616 | return ret; | |
55e64701 KK |
617 | } |
618 | ||
619 | static int max14577_charger_remove(struct platform_device *pdev) | |
620 | { | |
621 | struct max14577_charger *chg = platform_get_drvdata(pdev); | |
622 | ||
e30110e9 | 623 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); |
297d716f | 624 | power_supply_unregister(chg->charger); |
55e64701 KK |
625 | |
626 | return 0; | |
627 | } | |
628 | ||
3682a8ee KK |
629 | static const struct platform_device_id max14577_charger_id[] = { |
630 | { "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, }, | |
631 | { "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, }, | |
632 | { } | |
633 | }; | |
634 | MODULE_DEVICE_TABLE(platform, max14577_charger_id); | |
635 | ||
55e64701 KK |
636 | static struct platform_driver max14577_charger_driver = { |
637 | .driver = { | |
55e64701 KK |
638 | .name = "max14577-charger", |
639 | }, | |
640 | .probe = max14577_charger_probe, | |
641 | .remove = max14577_charger_remove, | |
3682a8ee | 642 | .id_table = max14577_charger_id, |
55e64701 KK |
643 | }; |
644 | module_platform_driver(max14577_charger_driver); | |
645 | ||
646 | MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); | |
3682a8ee | 647 | MODULE_DESCRIPTION("Maxim 14577/77836 charger driver"); |
55e64701 | 648 | MODULE_LICENSE("GPL"); |