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4aeae9cb LP |
1 | /* |
2 | * TI BQ25890 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 | #include <linux/usb/phy.h> | |
27 | ||
28 | #include <linux/acpi.h> | |
29 | #include <linux/of.h> | |
30 | ||
31 | #define BQ25890_MANUFACTURER "Texas Instruments" | |
32 | #define BQ25890_IRQ_PIN "bq25890_irq" | |
33 | ||
34 | #define BQ25890_ID 3 | |
35 | ||
36 | enum bq25890_fields { | |
37 | F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */ | |
38 | F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */ | |
39 | F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN, | |
40 | F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */ | |
41 | F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* Reg03 */ | |
42 | F_PUMPX_EN, F_ICHG, /* Reg04 */ | |
43 | F_IPRECHG, F_ITERM, /* Reg05 */ | |
44 | F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */ | |
45 | F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR, | |
46 | F_JEITA_ISET, /* Reg07 */ | |
47 | F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */ | |
48 | F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET, | |
49 | F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */ | |
50 | F_BOOSTV, F_BOOSTI, /* Reg0A */ | |
51 | F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */ | |
52 | F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT, | |
53 | F_NTC_FAULT, /* Reg0C */ | |
54 | F_FORCE_VINDPM, F_VINDPM, /* Reg0D */ | |
55 | F_THERM_STAT, F_BATV, /* Reg0E */ | |
56 | F_SYSV, /* Reg0F */ | |
57 | F_TSPCT, /* Reg10 */ | |
58 | F_VBUS_GD, F_VBUSV, /* Reg11 */ | |
59 | F_ICHGR, /* Reg12 */ | |
60 | F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */ | |
61 | F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */ | |
62 | ||
63 | F_MAX_FIELDS | |
64 | }; | |
65 | ||
66 | /* initial field values, converted to register values */ | |
67 | struct bq25890_init_data { | |
68 | u8 ichg; /* charge current */ | |
69 | u8 vreg; /* regulation voltage */ | |
70 | u8 iterm; /* termination current */ | |
71 | u8 iprechg; /* precharge current */ | |
72 | u8 sysvmin; /* minimum system voltage limit */ | |
73 | u8 boostv; /* boost regulation voltage */ | |
74 | u8 boosti; /* boost current limit */ | |
75 | u8 boostf; /* boost frequency */ | |
76 | u8 ilim_en; /* enable ILIM pin */ | |
77 | u8 treg; /* thermal regulation threshold */ | |
78 | }; | |
79 | ||
80 | struct bq25890_state { | |
81 | u8 online; | |
82 | u8 chrg_status; | |
83 | u8 chrg_fault; | |
84 | u8 vsys_status; | |
85 | u8 boost_fault; | |
86 | u8 bat_fault; | |
87 | }; | |
88 | ||
89 | struct bq25890_device { | |
90 | struct i2c_client *client; | |
91 | struct device *dev; | |
92 | struct power_supply *charger; | |
93 | ||
94 | struct usb_phy *usb_phy; | |
95 | struct notifier_block usb_nb; | |
96 | struct work_struct usb_work; | |
97 | unsigned long usb_event; | |
98 | ||
99 | struct regmap *rmap; | |
100 | struct regmap_field *rmap_fields[F_MAX_FIELDS]; | |
101 | ||
23fa43a2 | 102 | int chip_id; |
4aeae9cb LP |
103 | struct bq25890_init_data init_data; |
104 | struct bq25890_state state; | |
105 | ||
106 | struct mutex lock; /* protect state data */ | |
107 | }; | |
108 | ||
109 | static const struct regmap_range bq25890_readonly_reg_ranges[] = { | |
110 | regmap_reg_range(0x0b, 0x0c), | |
111 | regmap_reg_range(0x0e, 0x13), | |
112 | }; | |
113 | ||
114 | static const struct regmap_access_table bq25890_writeable_regs = { | |
115 | .no_ranges = bq25890_readonly_reg_ranges, | |
116 | .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges), | |
117 | }; | |
118 | ||
119 | static const struct regmap_range bq25890_volatile_reg_ranges[] = { | |
120 | regmap_reg_range(0x00, 0x00), | |
121 | regmap_reg_range(0x09, 0x09), | |
122 | regmap_reg_range(0x0b, 0x0c), | |
123 | regmap_reg_range(0x0e, 0x14), | |
124 | }; | |
125 | ||
126 | static const struct regmap_access_table bq25890_volatile_regs = { | |
127 | .yes_ranges = bq25890_volatile_reg_ranges, | |
128 | .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges), | |
129 | }; | |
130 | ||
131 | static const struct regmap_config bq25890_regmap_config = { | |
132 | .reg_bits = 8, | |
133 | .val_bits = 8, | |
134 | ||
135 | .max_register = 0x14, | |
136 | .cache_type = REGCACHE_RBTREE, | |
137 | ||
138 | .wr_table = &bq25890_writeable_regs, | |
139 | .volatile_table = &bq25890_volatile_regs, | |
140 | }; | |
141 | ||
142 | static const struct reg_field bq25890_reg_fields[] = { | |
143 | /* REG00 */ | |
144 | [F_EN_HIZ] = REG_FIELD(0x00, 7, 7), | |
145 | [F_EN_ILIM] = REG_FIELD(0x00, 6, 6), | |
146 | [F_IILIM] = REG_FIELD(0x00, 0, 5), | |
147 | /* REG01 */ | |
148 | [F_BHOT] = REG_FIELD(0x01, 6, 7), | |
149 | [F_BCOLD] = REG_FIELD(0x01, 5, 5), | |
150 | [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4), | |
151 | /* REG02 */ | |
152 | [F_CONV_START] = REG_FIELD(0x02, 7, 7), | |
153 | [F_CONV_RATE] = REG_FIELD(0x02, 6, 6), | |
154 | [F_BOOSTF] = REG_FIELD(0x02, 5, 5), | |
155 | [F_ICO_EN] = REG_FIELD(0x02, 4, 4), | |
156 | [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3), | |
157 | [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), | |
158 | [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1), | |
159 | [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0), | |
160 | /* REG03 */ | |
161 | [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7), | |
162 | [F_WD_RST] = REG_FIELD(0x03, 6, 6), | |
163 | [F_OTG_CFG] = REG_FIELD(0x03, 5, 5), | |
164 | [F_CHG_CFG] = REG_FIELD(0x03, 4, 4), | |
165 | [F_SYSVMIN] = REG_FIELD(0x03, 1, 3), | |
166 | /* REG04 */ | |
167 | [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7), | |
168 | [F_ICHG] = REG_FIELD(0x04, 0, 6), | |
169 | /* REG05 */ | |
170 | [F_IPRECHG] = REG_FIELD(0x05, 4, 7), | |
171 | [F_ITERM] = REG_FIELD(0x05, 0, 3), | |
172 | /* REG06 */ | |
173 | [F_VREG] = REG_FIELD(0x06, 2, 7), | |
174 | [F_BATLOWV] = REG_FIELD(0x06, 1, 1), | |
175 | [F_VRECHG] = REG_FIELD(0x06, 0, 0), | |
176 | /* REG07 */ | |
177 | [F_TERM_EN] = REG_FIELD(0x07, 7, 7), | |
178 | [F_STAT_DIS] = REG_FIELD(0x07, 6, 6), | |
179 | [F_WD] = REG_FIELD(0x07, 4, 5), | |
180 | [F_TMR_EN] = REG_FIELD(0x07, 3, 3), | |
181 | [F_CHG_TMR] = REG_FIELD(0x07, 1, 2), | |
182 | [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0), | |
183 | /* REG08 */ | |
184 | [F_BATCMP] = REG_FIELD(0x08, 6, 7), | |
185 | [F_VCLAMP] = REG_FIELD(0x08, 2, 4), | |
186 | [F_TREG] = REG_FIELD(0x08, 0, 1), | |
187 | /* REG09 */ | |
188 | [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7), | |
189 | [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6), | |
190 | [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5), | |
191 | [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4), | |
192 | [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3), | |
193 | [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2), | |
194 | [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1), | |
195 | [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0), | |
196 | /* REG0A */ | |
197 | [F_BOOSTV] = REG_FIELD(0x0A, 4, 7), | |
198 | [F_BOOSTI] = REG_FIELD(0x0A, 0, 2), | |
199 | /* REG0B */ | |
200 | [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7), | |
201 | [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4), | |
202 | [F_PG_STAT] = REG_FIELD(0x0B, 2, 2), | |
203 | [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), | |
204 | [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0), | |
205 | /* REG0C */ | |
206 | [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7), | |
207 | [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6), | |
208 | [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5), | |
209 | [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3), | |
210 | [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2), | |
211 | /* REG0D */ | |
212 | [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7), | |
213 | [F_VINDPM] = REG_FIELD(0x0D, 0, 6), | |
214 | /* REG0E */ | |
215 | [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7), | |
216 | [F_BATV] = REG_FIELD(0x0E, 0, 6), | |
217 | /* REG0F */ | |
218 | [F_SYSV] = REG_FIELD(0x0F, 0, 6), | |
219 | /* REG10 */ | |
220 | [F_TSPCT] = REG_FIELD(0x10, 0, 6), | |
221 | /* REG11 */ | |
222 | [F_VBUS_GD] = REG_FIELD(0x11, 7, 7), | |
223 | [F_VBUSV] = REG_FIELD(0x11, 0, 6), | |
224 | /* REG12 */ | |
225 | [F_ICHGR] = REG_FIELD(0x12, 0, 6), | |
226 | /* REG13 */ | |
227 | [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7), | |
228 | [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6), | |
229 | [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5), | |
230 | /* REG14 */ | |
231 | [F_REG_RST] = REG_FIELD(0x14, 7, 7), | |
232 | [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6), | |
233 | [F_PN] = REG_FIELD(0x14, 3, 5), | |
234 | [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2), | |
235 | [F_DEV_REV] = REG_FIELD(0x14, 0, 1) | |
236 | }; | |
237 | ||
238 | /* | |
239 | * Most of the val -> idx conversions can be computed, given the minimum, | |
240 | * maximum and the step between values. For the rest of conversions, we use | |
241 | * lookup tables. | |
242 | */ | |
243 | enum bq25890_table_ids { | |
244 | /* range tables */ | |
245 | TBL_ICHG, | |
246 | TBL_ITERM, | |
247 | TBL_IPRECHG, | |
248 | TBL_VREG, | |
249 | TBL_BATCMP, | |
250 | TBL_VCLAMP, | |
251 | TBL_BOOSTV, | |
252 | TBL_SYSVMIN, | |
253 | ||
254 | /* lookup tables */ | |
255 | TBL_TREG, | |
256 | TBL_BOOSTI, | |
257 | }; | |
258 | ||
259 | /* Thermal Regulation Threshold lookup table, in degrees Celsius */ | |
260 | static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 }; | |
261 | ||
262 | #define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl) | |
263 | ||
264 | /* Boost mode current limit lookup table, in uA */ | |
265 | static const u32 bq25890_boosti_tbl[] = { | |
266 | 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000 | |
267 | }; | |
268 | ||
269 | #define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl) | |
270 | ||
271 | struct bq25890_range { | |
272 | u32 min; | |
273 | u32 max; | |
274 | u32 step; | |
275 | }; | |
276 | ||
277 | struct bq25890_lookup { | |
278 | const u32 *tbl; | |
279 | u32 size; | |
280 | }; | |
281 | ||
282 | static const union { | |
283 | struct bq25890_range rt; | |
284 | struct bq25890_lookup lt; | |
285 | } bq25890_tables[] = { | |
286 | /* range tables */ | |
287 | [TBL_ICHG] = { .rt = {0, 5056000, 64000} }, /* uA */ | |
288 | [TBL_ITERM] = { .rt = {64000, 1024000, 64000} }, /* uA */ | |
289 | [TBL_VREG] = { .rt = {3840000, 4608000, 16000} }, /* uV */ | |
290 | [TBL_BATCMP] = { .rt = {0, 140, 20} }, /* mOhm */ | |
291 | [TBL_VCLAMP] = { .rt = {0, 224000, 32000} }, /* uV */ | |
292 | [TBL_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */ | |
293 | [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */ | |
294 | ||
295 | /* lookup tables */ | |
296 | [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} }, | |
297 | [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} } | |
298 | }; | |
299 | ||
300 | static int bq25890_field_read(struct bq25890_device *bq, | |
301 | enum bq25890_fields field_id) | |
302 | { | |
303 | int ret; | |
304 | int val; | |
305 | ||
306 | ret = regmap_field_read(bq->rmap_fields[field_id], &val); | |
307 | if (ret < 0) | |
308 | return ret; | |
309 | ||
310 | return val; | |
311 | } | |
312 | ||
313 | static int bq25890_field_write(struct bq25890_device *bq, | |
314 | enum bq25890_fields field_id, u8 val) | |
315 | { | |
316 | return regmap_field_write(bq->rmap_fields[field_id], val); | |
317 | } | |
318 | ||
319 | static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id) | |
320 | { | |
321 | u8 idx; | |
322 | ||
323 | if (id >= TBL_TREG) { | |
324 | const u32 *tbl = bq25890_tables[id].lt.tbl; | |
325 | u32 tbl_size = bq25890_tables[id].lt.size; | |
326 | ||
327 | for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++) | |
328 | ; | |
329 | } else { | |
330 | const struct bq25890_range *rtbl = &bq25890_tables[id].rt; | |
331 | u8 rtbl_size; | |
332 | ||
333 | rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1; | |
334 | ||
335 | for (idx = 1; | |
336 | idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value); | |
337 | idx++) | |
338 | ; | |
339 | } | |
340 | ||
341 | return idx - 1; | |
342 | } | |
343 | ||
344 | static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id) | |
345 | { | |
346 | const struct bq25890_range *rtbl; | |
347 | ||
348 | /* lookup table? */ | |
349 | if (id >= TBL_TREG) | |
350 | return bq25890_tables[id].lt.tbl[idx]; | |
351 | ||
352 | /* range table */ | |
353 | rtbl = &bq25890_tables[id].rt; | |
354 | ||
355 | return (rtbl->min + idx * rtbl->step); | |
356 | } | |
357 | ||
358 | enum bq25890_status { | |
359 | STATUS_NOT_CHARGING, | |
360 | STATUS_PRE_CHARGING, | |
361 | STATUS_FAST_CHARGING, | |
362 | STATUS_TERMINATION_DONE, | |
363 | }; | |
364 | ||
365 | enum bq25890_chrg_fault { | |
366 | CHRG_FAULT_NORMAL, | |
367 | CHRG_FAULT_INPUT, | |
368 | CHRG_FAULT_THERMAL_SHUTDOWN, | |
369 | CHRG_FAULT_TIMER_EXPIRED, | |
370 | }; | |
371 | ||
372 | static int bq25890_power_supply_get_property(struct power_supply *psy, | |
373 | enum power_supply_property psp, | |
374 | union power_supply_propval *val) | |
375 | { | |
376 | int ret; | |
377 | struct bq25890_device *bq = power_supply_get_drvdata(psy); | |
378 | struct bq25890_state state; | |
379 | ||
380 | mutex_lock(&bq->lock); | |
381 | state = bq->state; | |
382 | mutex_unlock(&bq->lock); | |
383 | ||
384 | switch (psp) { | |
385 | case POWER_SUPPLY_PROP_STATUS: | |
386 | if (!state.online) | |
387 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
388 | else if (state.chrg_status == STATUS_NOT_CHARGING) | |
389 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
390 | else if (state.chrg_status == STATUS_PRE_CHARGING || | |
391 | state.chrg_status == STATUS_FAST_CHARGING) | |
392 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
393 | else if (state.chrg_status == STATUS_TERMINATION_DONE) | |
394 | val->intval = POWER_SUPPLY_STATUS_FULL; | |
395 | else | |
396 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
397 | ||
398 | break; | |
399 | ||
400 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
401 | val->strval = BQ25890_MANUFACTURER; | |
402 | break; | |
403 | ||
404 | case POWER_SUPPLY_PROP_ONLINE: | |
405 | val->intval = state.online; | |
406 | break; | |
407 | ||
408 | case POWER_SUPPLY_PROP_HEALTH: | |
409 | if (!state.chrg_fault && !state.bat_fault && !state.boost_fault) | |
410 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
411 | else if (state.bat_fault) | |
412 | val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; | |
413 | else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED) | |
414 | val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; | |
415 | else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN) | |
416 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
417 | else | |
418 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
419 | break; | |
420 | ||
421 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: | |
422 | ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */ | |
423 | if (ret < 0) | |
424 | return ret; | |
425 | ||
426 | /* converted_val = ADC_val * 50mA (table 10.3.19) */ | |
427 | val->intval = ret * 50000; | |
428 | break; | |
429 | ||
430 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: | |
431 | val->intval = bq25890_tables[TBL_ICHG].rt.max; | |
432 | break; | |
433 | ||
434 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: | |
435 | if (!state.online) { | |
436 | val->intval = 0; | |
437 | break; | |
438 | } | |
439 | ||
440 | ret = bq25890_field_read(bq, F_BATV); /* read measured value */ | |
441 | if (ret < 0) | |
442 | return ret; | |
443 | ||
444 | /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ | |
445 | val->intval = 2304000 + ret * 20000; | |
446 | break; | |
447 | ||
448 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: | |
449 | val->intval = bq25890_tables[TBL_VREG].rt.max; | |
450 | break; | |
451 | ||
452 | case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: | |
453 | val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM); | |
454 | break; | |
455 | ||
456 | default: | |
457 | return -EINVAL; | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static int bq25890_get_chip_state(struct bq25890_device *bq, | |
464 | struct bq25890_state *state) | |
465 | { | |
466 | int i, ret; | |
467 | ||
468 | struct { | |
469 | enum bq25890_fields id; | |
470 | u8 *data; | |
471 | } state_fields[] = { | |
472 | {F_CHG_STAT, &state->chrg_status}, | |
473 | {F_PG_STAT, &state->online}, | |
474 | {F_VSYS_STAT, &state->vsys_status}, | |
475 | {F_BOOST_FAULT, &state->boost_fault}, | |
476 | {F_BAT_FAULT, &state->bat_fault}, | |
477 | {F_CHG_FAULT, &state->chrg_fault} | |
478 | }; | |
479 | ||
480 | for (i = 0; i < ARRAY_SIZE(state_fields); i++) { | |
481 | ret = bq25890_field_read(bq, state_fields[i].id); | |
482 | if (ret < 0) | |
483 | return ret; | |
484 | ||
485 | *state_fields[i].data = ret; | |
486 | } | |
487 | ||
488 | dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n", | |
489 | state->chrg_status, state->online, state->vsys_status, | |
490 | state->chrg_fault, state->boost_fault, state->bat_fault); | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | static bool bq25890_state_changed(struct bq25890_device *bq, | |
496 | struct bq25890_state *new_state) | |
497 | { | |
498 | struct bq25890_state old_state; | |
499 | ||
500 | mutex_lock(&bq->lock); | |
501 | old_state = bq->state; | |
502 | mutex_unlock(&bq->lock); | |
503 | ||
504 | return (old_state.chrg_status != new_state->chrg_status || | |
505 | old_state.chrg_fault != new_state->chrg_fault || | |
506 | old_state.online != new_state->online || | |
507 | old_state.bat_fault != new_state->bat_fault || | |
508 | old_state.boost_fault != new_state->boost_fault || | |
509 | old_state.vsys_status != new_state->vsys_status); | |
510 | } | |
511 | ||
512 | static void bq25890_handle_state_change(struct bq25890_device *bq, | |
513 | struct bq25890_state *new_state) | |
514 | { | |
515 | int ret; | |
516 | struct bq25890_state old_state; | |
517 | ||
518 | mutex_lock(&bq->lock); | |
519 | old_state = bq->state; | |
520 | mutex_unlock(&bq->lock); | |
521 | ||
522 | if (!new_state->online) { /* power removed */ | |
523 | /* disable ADC */ | |
524 | ret = bq25890_field_write(bq, F_CONV_START, 0); | |
525 | if (ret < 0) | |
526 | goto error; | |
527 | } else if (!old_state.online) { /* power inserted */ | |
528 | /* enable ADC, to have control of charge current/voltage */ | |
529 | ret = bq25890_field_write(bq, F_CONV_START, 1); | |
530 | if (ret < 0) | |
531 | goto error; | |
532 | } | |
533 | ||
534 | return; | |
535 | ||
536 | error: | |
537 | dev_err(bq->dev, "Error communicating with the chip.\n"); | |
538 | } | |
539 | ||
540 | static irqreturn_t bq25890_irq_handler_thread(int irq, void *private) | |
541 | { | |
542 | struct bq25890_device *bq = private; | |
543 | int ret; | |
544 | struct bq25890_state state; | |
545 | ||
546 | ret = bq25890_get_chip_state(bq, &state); | |
547 | if (ret < 0) | |
548 | goto handled; | |
549 | ||
550 | if (!bq25890_state_changed(bq, &state)) | |
551 | goto handled; | |
552 | ||
553 | bq25890_handle_state_change(bq, &state); | |
554 | ||
555 | mutex_lock(&bq->lock); | |
556 | bq->state = state; | |
557 | mutex_unlock(&bq->lock); | |
558 | ||
559 | power_supply_changed(bq->charger); | |
560 | ||
561 | handled: | |
562 | return IRQ_HANDLED; | |
563 | } | |
564 | ||
565 | static int bq25890_chip_reset(struct bq25890_device *bq) | |
566 | { | |
567 | int ret; | |
568 | int rst_check_counter = 10; | |
569 | ||
570 | ret = bq25890_field_write(bq, F_REG_RST, 1); | |
571 | if (ret < 0) | |
572 | return ret; | |
573 | ||
574 | do { | |
575 | ret = bq25890_field_read(bq, F_REG_RST); | |
576 | if (ret < 0) | |
577 | return ret; | |
578 | ||
579 | usleep_range(5, 10); | |
580 | } while (ret == 1 && --rst_check_counter); | |
581 | ||
582 | if (!rst_check_counter) | |
583 | return -ETIMEDOUT; | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
588 | static int bq25890_hw_init(struct bq25890_device *bq) | |
589 | { | |
590 | int ret; | |
591 | int i; | |
592 | struct bq25890_state state; | |
593 | ||
594 | const struct { | |
595 | enum bq25890_fields id; | |
596 | u32 value; | |
597 | } init_data[] = { | |
598 | {F_ICHG, bq->init_data.ichg}, | |
599 | {F_VREG, bq->init_data.vreg}, | |
600 | {F_ITERM, bq->init_data.iterm}, | |
601 | {F_IPRECHG, bq->init_data.iprechg}, | |
602 | {F_SYSVMIN, bq->init_data.sysvmin}, | |
603 | {F_BOOSTV, bq->init_data.boostv}, | |
604 | {F_BOOSTI, bq->init_data.boosti}, | |
605 | {F_BOOSTF, bq->init_data.boostf}, | |
606 | {F_EN_ILIM, bq->init_data.ilim_en}, | |
607 | {F_TREG, bq->init_data.treg} | |
608 | }; | |
609 | ||
610 | ret = bq25890_chip_reset(bq); | |
611 | if (ret < 0) | |
612 | return ret; | |
613 | ||
614 | /* disable watchdog */ | |
615 | ret = bq25890_field_write(bq, F_WD, 0); | |
616 | if (ret < 0) | |
617 | return ret; | |
618 | ||
619 | /* initialize currents/voltages and other parameters */ | |
620 | for (i = 0; i < ARRAY_SIZE(init_data); i++) { | |
621 | ret = bq25890_field_write(bq, init_data[i].id, | |
622 | init_data[i].value); | |
623 | if (ret < 0) | |
624 | return ret; | |
625 | } | |
626 | ||
627 | /* Configure ADC for continuous conversions. This does not enable it. */ | |
628 | ret = bq25890_field_write(bq, F_CONV_RATE, 1); | |
629 | if (ret < 0) | |
630 | return ret; | |
631 | ||
632 | ret = bq25890_get_chip_state(bq, &state); | |
633 | if (ret < 0) | |
634 | return ret; | |
635 | ||
636 | mutex_lock(&bq->lock); | |
637 | bq->state = state; | |
638 | mutex_unlock(&bq->lock); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
643 | static enum power_supply_property bq25890_power_supply_props[] = { | |
644 | POWER_SUPPLY_PROP_MANUFACTURER, | |
645 | POWER_SUPPLY_PROP_STATUS, | |
646 | POWER_SUPPLY_PROP_ONLINE, | |
647 | POWER_SUPPLY_PROP_HEALTH, | |
648 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, | |
649 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, | |
650 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, | |
651 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, | |
652 | POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, | |
653 | }; | |
654 | ||
655 | static char *bq25890_charger_supplied_to[] = { | |
656 | "main-battery", | |
657 | }; | |
658 | ||
659 | static const struct power_supply_desc bq25890_power_supply_desc = { | |
660 | .name = "bq25890-charger", | |
661 | .type = POWER_SUPPLY_TYPE_USB, | |
662 | .properties = bq25890_power_supply_props, | |
663 | .num_properties = ARRAY_SIZE(bq25890_power_supply_props), | |
664 | .get_property = bq25890_power_supply_get_property, | |
665 | }; | |
666 | ||
667 | static int bq25890_power_supply_init(struct bq25890_device *bq) | |
668 | { | |
669 | struct power_supply_config psy_cfg = { .drv_data = bq, }; | |
670 | ||
671 | psy_cfg.supplied_to = bq25890_charger_supplied_to; | |
672 | psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to); | |
673 | ||
674 | bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc, | |
675 | &psy_cfg); | |
676 | ||
677 | return PTR_ERR_OR_ZERO(bq->charger); | |
678 | } | |
679 | ||
680 | static void bq25890_usb_work(struct work_struct *data) | |
681 | { | |
682 | int ret; | |
683 | struct bq25890_device *bq = | |
684 | container_of(data, struct bq25890_device, usb_work); | |
685 | ||
686 | switch (bq->usb_event) { | |
687 | case USB_EVENT_ID: | |
688 | /* Enable boost mode */ | |
689 | ret = bq25890_field_write(bq, F_OTG_CFG, 1); | |
690 | if (ret < 0) | |
691 | goto error; | |
692 | break; | |
693 | ||
694 | case USB_EVENT_NONE: | |
695 | /* Disable boost mode */ | |
696 | ret = bq25890_field_write(bq, F_OTG_CFG, 0); | |
697 | if (ret < 0) | |
698 | goto error; | |
699 | ||
700 | power_supply_changed(bq->charger); | |
701 | break; | |
702 | } | |
703 | ||
704 | return; | |
705 | ||
706 | error: | |
707 | dev_err(bq->dev, "Error switching to boost/charger mode.\n"); | |
708 | } | |
709 | ||
710 | static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val, | |
711 | void *priv) | |
712 | { | |
713 | struct bq25890_device *bq = | |
714 | container_of(nb, struct bq25890_device, usb_nb); | |
715 | ||
716 | bq->usb_event = val; | |
717 | queue_work(system_power_efficient_wq, &bq->usb_work); | |
718 | ||
719 | return NOTIFY_OK; | |
720 | } | |
721 | ||
722 | static int bq25890_irq_probe(struct bq25890_device *bq) | |
723 | { | |
4aeae9cb LP |
724 | struct gpio_desc *irq; |
725 | ||
0007fa36 | 726 | irq = devm_gpiod_get_index(bq->dev, BQ25890_IRQ_PIN, 0, GPIOD_IN); |
4aeae9cb LP |
727 | if (IS_ERR(irq)) { |
728 | dev_err(bq->dev, "Could not probe irq pin.\n"); | |
729 | return PTR_ERR(irq); | |
730 | } | |
731 | ||
4aeae9cb LP |
732 | return gpiod_to_irq(irq); |
733 | } | |
734 | ||
735 | static int bq25890_fw_read_u32_props(struct bq25890_device *bq) | |
736 | { | |
737 | int ret; | |
738 | u32 property; | |
739 | int i; | |
740 | struct bq25890_init_data *init = &bq->init_data; | |
741 | struct { | |
742 | char *name; | |
743 | bool optional; | |
744 | enum bq25890_table_ids tbl_id; | |
745 | u8 *conv_data; /* holds converted value from given property */ | |
746 | } props[] = { | |
747 | /* required properties */ | |
748 | {"ti,charge-current", false, TBL_ICHG, &init->ichg}, | |
749 | {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg}, | |
750 | {"ti,termination-current", false, TBL_ITERM, &init->iterm}, | |
751 | {"ti,precharge-current", false, TBL_ITERM, &init->iprechg}, | |
752 | {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin}, | |
753 | {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv}, | |
754 | {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti}, | |
755 | ||
756 | /* optional properties */ | |
757 | {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg} | |
758 | }; | |
759 | ||
760 | /* initialize data for optional properties */ | |
761 | init->treg = 3; /* 120 degrees Celsius */ | |
762 | ||
763 | for (i = 0; i < ARRAY_SIZE(props); i++) { | |
764 | ret = device_property_read_u32(bq->dev, props[i].name, | |
765 | &property); | |
766 | if (ret < 0) { | |
767 | if (props[i].optional) | |
768 | continue; | |
769 | ||
770 | return ret; | |
771 | } | |
772 | ||
773 | *props[i].conv_data = bq25890_find_idx(property, | |
774 | props[i].tbl_id); | |
775 | } | |
776 | ||
777 | return 0; | |
778 | } | |
779 | ||
780 | static int bq25890_fw_probe(struct bq25890_device *bq) | |
781 | { | |
782 | int ret; | |
783 | struct bq25890_init_data *init = &bq->init_data; | |
784 | ||
785 | ret = bq25890_fw_read_u32_props(bq); | |
786 | if (ret < 0) | |
787 | return ret; | |
788 | ||
789 | init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin"); | |
790 | init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq"); | |
791 | ||
792 | return 0; | |
793 | } | |
794 | ||
795 | static int bq25890_probe(struct i2c_client *client, | |
796 | const struct i2c_device_id *id) | |
797 | { | |
798 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
799 | struct device *dev = &client->dev; | |
800 | struct bq25890_device *bq; | |
801 | int ret; | |
802 | int i; | |
803 | ||
804 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { | |
805 | dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); | |
806 | return -ENODEV; | |
807 | } | |
808 | ||
809 | bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); | |
810 | if (!bq) | |
811 | return -ENOMEM; | |
812 | ||
813 | bq->client = client; | |
814 | bq->dev = dev; | |
815 | ||
816 | mutex_init(&bq->lock); | |
817 | ||
818 | bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config); | |
819 | if (IS_ERR(bq->rmap)) { | |
820 | dev_err(dev, "failed to allocate register map\n"); | |
821 | return PTR_ERR(bq->rmap); | |
822 | } | |
823 | ||
824 | for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) { | |
825 | const struct reg_field *reg_fields = bq25890_reg_fields; | |
826 | ||
827 | bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, | |
828 | reg_fields[i]); | |
829 | if (IS_ERR(bq->rmap_fields[i])) { | |
830 | dev_err(dev, "cannot allocate regmap field\n"); | |
831 | return PTR_ERR(bq->rmap_fields[i]); | |
832 | } | |
833 | } | |
834 | ||
835 | i2c_set_clientdata(client, bq); | |
836 | ||
837 | bq->chip_id = bq25890_field_read(bq, F_PN); | |
838 | if (bq->chip_id < 0) { | |
839 | dev_err(dev, "Cannot read chip ID.\n"); | |
23fa43a2 | 840 | return bq->chip_id; |
4aeae9cb LP |
841 | } |
842 | ||
843 | if (bq->chip_id != BQ25890_ID) { | |
844 | dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id); | |
845 | return -ENODEV; | |
846 | } | |
847 | ||
848 | if (!dev->platform_data) { | |
849 | ret = bq25890_fw_probe(bq); | |
850 | if (ret < 0) { | |
851 | dev_err(dev, "Cannot read device properties.\n"); | |
852 | return ret; | |
853 | } | |
854 | } else { | |
855 | return -ENODEV; | |
856 | } | |
857 | ||
858 | ret = bq25890_hw_init(bq); | |
859 | if (ret < 0) { | |
860 | dev_err(dev, "Cannot initialize the chip.\n"); | |
861 | return ret; | |
862 | } | |
863 | ||
864 | if (client->irq <= 0) | |
865 | client->irq = bq25890_irq_probe(bq); | |
866 | ||
867 | if (client->irq < 0) { | |
868 | dev_err(dev, "No irq resource found.\n"); | |
869 | return client->irq; | |
870 | } | |
871 | ||
872 | /* OTG reporting */ | |
873 | bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); | |
874 | if (!IS_ERR_OR_NULL(bq->usb_phy)) { | |
875 | INIT_WORK(&bq->usb_work, bq25890_usb_work); | |
876 | bq->usb_nb.notifier_call = bq25890_usb_notifier; | |
877 | usb_register_notifier(bq->usb_phy, &bq->usb_nb); | |
878 | } | |
879 | ||
880 | ret = devm_request_threaded_irq(dev, client->irq, NULL, | |
881 | bq25890_irq_handler_thread, | |
882 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
883 | BQ25890_IRQ_PIN, bq); | |
884 | if (ret) | |
885 | goto irq_fail; | |
886 | ||
887 | ret = bq25890_power_supply_init(bq); | |
888 | if (ret < 0) { | |
889 | dev_err(dev, "Failed to register power supply\n"); | |
890 | goto irq_fail; | |
891 | } | |
892 | ||
893 | return 0; | |
894 | ||
895 | irq_fail: | |
896 | if (!IS_ERR_OR_NULL(bq->usb_phy)) | |
897 | usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); | |
898 | ||
899 | return ret; | |
900 | } | |
901 | ||
902 | static int bq25890_remove(struct i2c_client *client) | |
903 | { | |
904 | struct bq25890_device *bq = i2c_get_clientdata(client); | |
905 | ||
906 | power_supply_unregister(bq->charger); | |
907 | ||
908 | if (!IS_ERR_OR_NULL(bq->usb_phy)) | |
909 | usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); | |
910 | ||
911 | /* reset all registers to default values */ | |
912 | bq25890_chip_reset(bq); | |
913 | ||
914 | return 0; | |
915 | } | |
916 | ||
917 | #ifdef CONFIG_PM_SLEEP | |
918 | static int bq25890_suspend(struct device *dev) | |
919 | { | |
920 | struct bq25890_device *bq = dev_get_drvdata(dev); | |
921 | ||
922 | /* | |
923 | * If charger is removed, while in suspend, make sure ADC is diabled | |
924 | * since it consumes slightly more power. | |
925 | */ | |
926 | return bq25890_field_write(bq, F_CONV_START, 0); | |
927 | } | |
928 | ||
929 | static int bq25890_resume(struct device *dev) | |
930 | { | |
931 | int ret; | |
932 | struct bq25890_state state; | |
933 | struct bq25890_device *bq = dev_get_drvdata(dev); | |
934 | ||
935 | ret = bq25890_get_chip_state(bq, &state); | |
936 | if (ret < 0) | |
937 | return ret; | |
938 | ||
939 | mutex_lock(&bq->lock); | |
940 | bq->state = state; | |
941 | mutex_unlock(&bq->lock); | |
942 | ||
943 | /* Re-enable ADC only if charger is plugged in. */ | |
944 | if (state.online) { | |
945 | ret = bq25890_field_write(bq, F_CONV_START, 1); | |
946 | if (ret < 0) | |
947 | return ret; | |
948 | } | |
949 | ||
950 | /* signal userspace, maybe state changed while suspended */ | |
951 | power_supply_changed(bq->charger); | |
952 | ||
953 | return 0; | |
954 | } | |
955 | #endif | |
956 | ||
957 | static const struct dev_pm_ops bq25890_pm = { | |
958 | SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume) | |
959 | }; | |
960 | ||
961 | static const struct i2c_device_id bq25890_i2c_ids[] = { | |
962 | { "bq25890", 0 }, | |
963 | {}, | |
964 | }; | |
965 | MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids); | |
966 | ||
967 | static const struct of_device_id bq25890_of_match[] = { | |
968 | { .compatible = "ti,bq25890", }, | |
969 | { }, | |
970 | }; | |
971 | MODULE_DEVICE_TABLE(of, bq25890_of_match); | |
972 | ||
973 | static const struct acpi_device_id bq25890_acpi_match[] = { | |
974 | {"BQ258900", 0}, | |
975 | {}, | |
976 | }; | |
977 | MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match); | |
978 | ||
979 | static struct i2c_driver bq25890_driver = { | |
980 | .driver = { | |
981 | .name = "bq25890-charger", | |
982 | .of_match_table = of_match_ptr(bq25890_of_match), | |
983 | .acpi_match_table = ACPI_PTR(bq25890_acpi_match), | |
984 | .pm = &bq25890_pm, | |
985 | }, | |
986 | .probe = bq25890_probe, | |
987 | .remove = bq25890_remove, | |
988 | .id_table = bq25890_i2c_ids, | |
989 | }; | |
990 | module_i2c_driver(bq25890_driver); | |
991 | ||
992 | MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); | |
993 | MODULE_DESCRIPTION("bq25890 charger driver"); | |
994 | MODULE_LICENSE("GPL"); |