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359ab9f5 MH |
1 | /* |
2 | * Fuel gauge driver for Maxim 17042 / 8966 / 8997 | |
3 | * Note that Maxim 8966 and 8997 are mfd and this is its subdevice. | |
4 | * | |
5 | * Copyright (C) 2011 Samsung Electronics | |
6 | * MyungJoo Ham <myungjoo.ham@samsung.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | * | |
22 | * This driver is based on max17040_battery.c | |
23 | */ | |
24 | ||
25 | #include <linux/init.h> | |
7e6d62db | 26 | #include <linux/module.h> |
359ab9f5 MH |
27 | #include <linux/slab.h> |
28 | #include <linux/i2c.h> | |
f3a71a6e | 29 | #include <linux/delay.h> |
e5f3872d | 30 | #include <linux/interrupt.h> |
48bc1774 | 31 | #include <linux/pm.h> |
359ab9f5 MH |
32 | #include <linux/mod_devicetable.h> |
33 | #include <linux/power_supply.h> | |
34 | #include <linux/power/max17042_battery.h> | |
3832246d | 35 | #include <linux/of.h> |
359ab9f5 | 36 | |
f3a71a6e RP |
37 | /* Status register bits */ |
38 | #define STATUS_POR_BIT (1 << 1) | |
39 | #define STATUS_BST_BIT (1 << 3) | |
40 | #define STATUS_VMN_BIT (1 << 8) | |
41 | #define STATUS_TMN_BIT (1 << 9) | |
42 | #define STATUS_SMN_BIT (1 << 10) | |
43 | #define STATUS_BI_BIT (1 << 11) | |
44 | #define STATUS_VMX_BIT (1 << 12) | |
45 | #define STATUS_TMX_BIT (1 << 13) | |
46 | #define STATUS_SMX_BIT (1 << 14) | |
47 | #define STATUS_BR_BIT (1 << 15) | |
48 | ||
e5f3872d RP |
49 | /* Interrupt mask bits */ |
50 | #define CONFIG_ALRT_BIT_ENBL (1 << 2) | |
5cdd4d7f RP |
51 | #define STATUS_INTR_SOCMIN_BIT (1 << 10) |
52 | #define STATUS_INTR_SOCMAX_BIT (1 << 14) | |
e5f3872d | 53 | |
f3a71a6e RP |
54 | #define VFSOC0_LOCK 0x0000 |
55 | #define VFSOC0_UNLOCK 0x0080 | |
56 | #define MODEL_UNLOCK1 0X0059 | |
57 | #define MODEL_UNLOCK2 0X00C4 | |
58 | #define MODEL_LOCK1 0X0000 | |
59 | #define MODEL_LOCK2 0X0000 | |
60 | ||
61 | #define dQ_ACC_DIV 0x4 | |
62 | #define dP_ACC_100 0x1900 | |
63 | #define dP_ACC_200 0x3200 | |
64 | ||
359ab9f5 MH |
65 | struct max17042_chip { |
66 | struct i2c_client *client; | |
67 | struct power_supply battery; | |
68 | struct max17042_platform_data *pdata; | |
f3a71a6e RP |
69 | struct work_struct work; |
70 | int init_complete; | |
359ab9f5 MH |
71 | }; |
72 | ||
73 | static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value) | |
74 | { | |
75 | int ret = i2c_smbus_write_word_data(client, reg, value); | |
76 | ||
77 | if (ret < 0) | |
78 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); | |
79 | ||
80 | return ret; | |
81 | } | |
82 | ||
83 | static int max17042_read_reg(struct i2c_client *client, u8 reg) | |
84 | { | |
85 | int ret = i2c_smbus_read_word_data(client, reg); | |
86 | ||
87 | if (ret < 0) | |
88 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); | |
89 | ||
90 | return ret; | |
91 | } | |
92 | ||
086ef502 DK |
93 | static void max17042_set_reg(struct i2c_client *client, |
94 | struct max17042_reg_data *data, int size) | |
95 | { | |
96 | int i; | |
97 | ||
98 | for (i = 0; i < size; i++) | |
99 | max17042_write_reg(client, data[i].addr, data[i].data); | |
100 | } | |
101 | ||
359ab9f5 | 102 | static enum power_supply_property max17042_battery_props[] = { |
086ef502 DK |
103 | POWER_SUPPLY_PROP_PRESENT, |
104 | POWER_SUPPLY_PROP_CYCLE_COUNT, | |
105 | POWER_SUPPLY_PROP_VOLTAGE_MAX, | |
106 | POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, | |
359ab9f5 MH |
107 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
108 | POWER_SUPPLY_PROP_VOLTAGE_AVG, | |
109 | POWER_SUPPLY_PROP_CAPACITY, | |
086ef502 DK |
110 | POWER_SUPPLY_PROP_CHARGE_FULL, |
111 | POWER_SUPPLY_PROP_TEMP, | |
112 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
113 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
359ab9f5 MH |
114 | }; |
115 | ||
116 | static int max17042_get_property(struct power_supply *psy, | |
117 | enum power_supply_property psp, | |
118 | union power_supply_propval *val) | |
119 | { | |
120 | struct max17042_chip *chip = container_of(psy, | |
121 | struct max17042_chip, battery); | |
60a1f6e4 | 122 | int ret; |
359ab9f5 | 123 | |
f3a71a6e RP |
124 | if (!chip->init_complete) |
125 | return -EAGAIN; | |
126 | ||
359ab9f5 | 127 | switch (psp) { |
086ef502 | 128 | case POWER_SUPPLY_PROP_PRESENT: |
60a1f6e4 RP |
129 | ret = max17042_read_reg(chip->client, MAX17042_STATUS); |
130 | if (ret < 0) | |
131 | return ret; | |
132 | ||
133 | if (ret & MAX17042_STATUS_BattAbsent) | |
086ef502 DK |
134 | val->intval = 0; |
135 | else | |
136 | val->intval = 1; | |
137 | break; | |
138 | case POWER_SUPPLY_PROP_CYCLE_COUNT: | |
60a1f6e4 RP |
139 | ret = max17042_read_reg(chip->client, MAX17042_Cycles); |
140 | if (ret < 0) | |
141 | return ret; | |
142 | ||
143 | val->intval = ret; | |
086ef502 DK |
144 | break; |
145 | case POWER_SUPPLY_PROP_VOLTAGE_MAX: | |
60a1f6e4 RP |
146 | ret = max17042_read_reg(chip->client, MAX17042_MinMaxVolt); |
147 | if (ret < 0) | |
148 | return ret; | |
149 | ||
150 | val->intval = ret >> 8; | |
086ef502 DK |
151 | val->intval *= 20000; /* Units of LSB = 20mV */ |
152 | break; | |
153 | case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: | |
60a1f6e4 RP |
154 | ret = max17042_read_reg(chip->client, MAX17042_V_empty); |
155 | if (ret < 0) | |
156 | return ret; | |
157 | ||
158 | val->intval = ret >> 7; | |
086ef502 DK |
159 | val->intval *= 10000; /* Units of LSB = 10mV */ |
160 | break; | |
359ab9f5 | 161 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
60a1f6e4 RP |
162 | ret = max17042_read_reg(chip->client, MAX17042_VCELL); |
163 | if (ret < 0) | |
164 | return ret; | |
165 | ||
166 | val->intval = ret * 625 / 8; | |
359ab9f5 MH |
167 | break; |
168 | case POWER_SUPPLY_PROP_VOLTAGE_AVG: | |
60a1f6e4 RP |
169 | ret = max17042_read_reg(chip->client, MAX17042_AvgVCELL); |
170 | if (ret < 0) | |
171 | return ret; | |
172 | ||
173 | val->intval = ret * 625 / 8; | |
359ab9f5 MH |
174 | break; |
175 | case POWER_SUPPLY_PROP_CAPACITY: | |
13e0aa46 | 176 | ret = max17042_read_reg(chip->client, MAX17042_RepSOC); |
60a1f6e4 RP |
177 | if (ret < 0) |
178 | return ret; | |
179 | ||
180 | val->intval = ret >> 8; | |
359ab9f5 | 181 | break; |
086ef502 | 182 | case POWER_SUPPLY_PROP_CHARGE_FULL: |
6e0e60cd | 183 | ret = max17042_read_reg(chip->client, MAX17042_FullCAP); |
60a1f6e4 RP |
184 | if (ret < 0) |
185 | return ret; | |
186 | ||
6e0e60cd | 187 | val->intval = ret * 1000 / 2; |
086ef502 DK |
188 | break; |
189 | case POWER_SUPPLY_PROP_TEMP: | |
60a1f6e4 RP |
190 | ret = max17042_read_reg(chip->client, MAX17042_TEMP); |
191 | if (ret < 0) | |
192 | return ret; | |
193 | ||
194 | val->intval = ret; | |
086ef502 DK |
195 | /* The value is signed. */ |
196 | if (val->intval & 0x8000) { | |
197 | val->intval = (0x7fff & ~val->intval) + 1; | |
198 | val->intval *= -1; | |
199 | } | |
200 | /* The value is converted into deci-centigrade scale */ | |
201 | /* Units of LSB = 1 / 256 degree Celsius */ | |
202 | val->intval = val->intval * 10 / 256; | |
203 | break; | |
204 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
205 | if (chip->pdata->enable_current_sense) { | |
60a1f6e4 RP |
206 | ret = max17042_read_reg(chip->client, MAX17042_Current); |
207 | if (ret < 0) | |
208 | return ret; | |
209 | ||
210 | val->intval = ret; | |
086ef502 DK |
211 | if (val->intval & 0x8000) { |
212 | /* Negative */ | |
213 | val->intval = ~val->intval & 0x7fff; | |
214 | val->intval++; | |
215 | val->intval *= -1; | |
216 | } | |
91d8b0d6 | 217 | val->intval *= 1562500 / chip->pdata->r_sns; |
086ef502 DK |
218 | } else { |
219 | return -EINVAL; | |
220 | } | |
221 | break; | |
222 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
223 | if (chip->pdata->enable_current_sense) { | |
60a1f6e4 RP |
224 | ret = max17042_read_reg(chip->client, |
225 | MAX17042_AvgCurrent); | |
226 | if (ret < 0) | |
227 | return ret; | |
228 | ||
229 | val->intval = ret; | |
086ef502 DK |
230 | if (val->intval & 0x8000) { |
231 | /* Negative */ | |
232 | val->intval = ~val->intval & 0x7fff; | |
233 | val->intval++; | |
234 | val->intval *= -1; | |
235 | } | |
236 | val->intval *= 1562500 / chip->pdata->r_sns; | |
237 | } else { | |
238 | return -EINVAL; | |
239 | } | |
240 | break; | |
359ab9f5 MH |
241 | default: |
242 | return -EINVAL; | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
f3a71a6e RP |
247 | static int max17042_write_verify_reg(struct i2c_client *client, |
248 | u8 reg, u16 value) | |
249 | { | |
250 | int retries = 8; | |
251 | int ret; | |
252 | u16 read_value; | |
253 | ||
254 | do { | |
255 | ret = i2c_smbus_write_word_data(client, reg, value); | |
256 | read_value = max17042_read_reg(client, reg); | |
257 | if (read_value != value) { | |
258 | ret = -EIO; | |
259 | retries--; | |
260 | } | |
261 | } while (retries && read_value != value); | |
262 | ||
263 | if (ret < 0) | |
264 | dev_err(&client->dev, "%s: err %d\n", __func__, ret); | |
265 | ||
266 | return ret; | |
267 | } | |
268 | ||
269 | static inline void max17042_override_por( | |
270 | struct i2c_client *client, u8 reg, u16 value) | |
271 | { | |
272 | if (value) | |
273 | max17042_write_reg(client, reg, value); | |
274 | } | |
275 | ||
276 | static inline void max10742_unlock_model(struct max17042_chip *chip) | |
277 | { | |
278 | struct i2c_client *client = chip->client; | |
279 | max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_UNLOCK1); | |
280 | max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_UNLOCK2); | |
281 | } | |
282 | ||
283 | static inline void max10742_lock_model(struct max17042_chip *chip) | |
284 | { | |
285 | struct i2c_client *client = chip->client; | |
286 | max17042_write_reg(client, MAX17042_MLOCKReg1, MODEL_LOCK1); | |
287 | max17042_write_reg(client, MAX17042_MLOCKReg2, MODEL_LOCK2); | |
288 | } | |
289 | ||
290 | static inline void max17042_write_model_data(struct max17042_chip *chip, | |
291 | u8 addr, int size) | |
292 | { | |
293 | struct i2c_client *client = chip->client; | |
294 | int i; | |
295 | for (i = 0; i < size; i++) | |
296 | max17042_write_reg(client, addr + i, | |
297 | chip->pdata->config_data->cell_char_tbl[i]); | |
298 | } | |
299 | ||
300 | static inline void max17042_read_model_data(struct max17042_chip *chip, | |
301 | u8 addr, u16 *data, int size) | |
302 | { | |
303 | struct i2c_client *client = chip->client; | |
304 | int i; | |
305 | ||
306 | for (i = 0; i < size; i++) | |
307 | data[i] = max17042_read_reg(client, addr + i); | |
308 | } | |
309 | ||
310 | static inline int max17042_model_data_compare(struct max17042_chip *chip, | |
311 | u16 *data1, u16 *data2, int size) | |
312 | { | |
313 | int i; | |
314 | ||
315 | if (memcmp(data1, data2, size)) { | |
316 | dev_err(&chip->client->dev, "%s compare failed\n", __func__); | |
317 | for (i = 0; i < size; i++) | |
318 | dev_info(&chip->client->dev, "0x%x, 0x%x", | |
319 | data1[i], data2[i]); | |
320 | dev_info(&chip->client->dev, "\n"); | |
321 | return -EINVAL; | |
322 | } | |
323 | return 0; | |
324 | } | |
325 | ||
326 | static int max17042_init_model(struct max17042_chip *chip) | |
327 | { | |
328 | int ret; | |
1ef3d8fb | 329 | int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); |
f3a71a6e RP |
330 | u16 *temp_data; |
331 | ||
1ef3d8fb | 332 | temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); |
f3a71a6e RP |
333 | if (!temp_data) |
334 | return -ENOMEM; | |
335 | ||
336 | max10742_unlock_model(chip); | |
337 | max17042_write_model_data(chip, MAX17042_MODELChrTbl, | |
338 | table_size); | |
339 | max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, | |
340 | table_size); | |
341 | ||
342 | ret = max17042_model_data_compare( | |
343 | chip, | |
344 | chip->pdata->config_data->cell_char_tbl, | |
345 | temp_data, | |
346 | table_size); | |
347 | ||
348 | max10742_lock_model(chip); | |
349 | kfree(temp_data); | |
350 | ||
351 | return ret; | |
352 | } | |
353 | ||
354 | static int max17042_verify_model_lock(struct max17042_chip *chip) | |
355 | { | |
356 | int i; | |
1ef3d8fb | 357 | int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl); |
f3a71a6e RP |
358 | u16 *temp_data; |
359 | int ret = 0; | |
360 | ||
1ef3d8fb | 361 | temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL); |
f3a71a6e RP |
362 | if (!temp_data) |
363 | return -ENOMEM; | |
364 | ||
365 | max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data, | |
366 | table_size); | |
367 | for (i = 0; i < table_size; i++) | |
368 | if (temp_data[i]) | |
369 | ret = -EINVAL; | |
370 | ||
371 | kfree(temp_data); | |
372 | return ret; | |
373 | } | |
374 | ||
375 | static void max17042_write_config_regs(struct max17042_chip *chip) | |
376 | { | |
377 | struct max17042_config_data *config = chip->pdata->config_data; | |
378 | ||
379 | max17042_write_reg(chip->client, MAX17042_CONFIG, config->config); | |
380 | max17042_write_reg(chip->client, MAX17042_LearnCFG, config->learn_cfg); | |
381 | max17042_write_reg(chip->client, MAX17042_FilterCFG, | |
382 | config->filter_cfg); | |
383 | max17042_write_reg(chip->client, MAX17042_RelaxCFG, config->relax_cfg); | |
384 | } | |
385 | ||
386 | static void max17042_write_custom_regs(struct max17042_chip *chip) | |
387 | { | |
388 | struct max17042_config_data *config = chip->pdata->config_data; | |
389 | ||
390 | max17042_write_verify_reg(chip->client, MAX17042_RCOMP0, | |
391 | config->rcomp0); | |
392 | max17042_write_verify_reg(chip->client, MAX17042_TempCo, | |
393 | config->tcompc0); | |
394 | max17042_write_reg(chip->client, MAX17042_EmptyTempCo, | |
395 | config->empty_tempco); | |
396 | max17042_write_verify_reg(chip->client, MAX17042_K_empty0, | |
397 | config->kempty0); | |
398 | max17042_write_verify_reg(chip->client, MAX17042_ICHGTerm, | |
399 | config->ichgt_term); | |
400 | } | |
401 | ||
402 | static void max17042_update_capacity_regs(struct max17042_chip *chip) | |
403 | { | |
404 | struct max17042_config_data *config = chip->pdata->config_data; | |
405 | ||
406 | max17042_write_verify_reg(chip->client, MAX17042_FullCAP, | |
407 | config->fullcap); | |
408 | max17042_write_reg(chip->client, MAX17042_DesignCap, | |
409 | config->design_cap); | |
410 | max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom, | |
411 | config->fullcapnom); | |
412 | } | |
413 | ||
414 | static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip) | |
415 | { | |
416 | u16 vfSoc; | |
417 | ||
418 | vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC); | |
419 | max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK); | |
420 | max17042_write_verify_reg(chip->client, MAX17042_VFSOC0, vfSoc); | |
421 | max17042_write_reg(chip->client, MAX17042_VFSOC0Enable, VFSOC0_LOCK); | |
422 | } | |
423 | ||
424 | static void max17042_load_new_capacity_params(struct max17042_chip *chip) | |
425 | { | |
426 | u16 full_cap0, rep_cap, dq_acc, vfSoc; | |
427 | u32 rem_cap; | |
428 | ||
429 | struct max17042_config_data *config = chip->pdata->config_data; | |
430 | ||
431 | full_cap0 = max17042_read_reg(chip->client, MAX17042_FullCAP0); | |
432 | vfSoc = max17042_read_reg(chip->client, MAX17042_VFSOC); | |
433 | ||
434 | /* fg_vfSoc needs to shifted by 8 bits to get the | |
435 | * perc in 1% accuracy, to get the right rem_cap multiply | |
436 | * full_cap0, fg_vfSoc and devide by 100 | |
437 | */ | |
438 | rem_cap = ((vfSoc >> 8) * full_cap0) / 100; | |
439 | max17042_write_verify_reg(chip->client, MAX17042_RemCap, (u16)rem_cap); | |
440 | ||
441 | rep_cap = (u16)rem_cap; | |
442 | max17042_write_verify_reg(chip->client, MAX17042_RepCap, rep_cap); | |
443 | ||
444 | /* Write dQ_acc to 200% of Capacity and dP_acc to 200% */ | |
445 | dq_acc = config->fullcap / dQ_ACC_DIV; | |
446 | max17042_write_verify_reg(chip->client, MAX17042_dQacc, dq_acc); | |
447 | max17042_write_verify_reg(chip->client, MAX17042_dPacc, dP_ACC_200); | |
448 | ||
449 | max17042_write_verify_reg(chip->client, MAX17042_FullCAP, | |
450 | config->fullcap); | |
451 | max17042_write_reg(chip->client, MAX17042_DesignCap, | |
452 | config->design_cap); | |
453 | max17042_write_verify_reg(chip->client, MAX17042_FullCAPNom, | |
454 | config->fullcapnom); | |
455 | } | |
456 | ||
457 | /* | |
458 | * Block write all the override values coming from platform data. | |
459 | * This function MUST be called before the POR initialization proceedure | |
460 | * specified by maxim. | |
461 | */ | |
462 | static inline void max17042_override_por_values(struct max17042_chip *chip) | |
463 | { | |
464 | struct i2c_client *client = chip->client; | |
465 | struct max17042_config_data *config = chip->pdata->config_data; | |
466 | ||
467 | max17042_override_por(client, MAX17042_TGAIN, config->tgain); | |
468 | max17042_override_por(client, MAx17042_TOFF, config->toff); | |
469 | max17042_override_por(client, MAX17042_CGAIN, config->cgain); | |
470 | max17042_override_por(client, MAX17042_COFF, config->coff); | |
471 | ||
472 | max17042_override_por(client, MAX17042_VALRT_Th, config->valrt_thresh); | |
473 | max17042_override_por(client, MAX17042_TALRT_Th, config->talrt_thresh); | |
474 | max17042_override_por(client, MAX17042_SALRT_Th, | |
475 | config->soc_alrt_thresh); | |
476 | max17042_override_por(client, MAX17042_CONFIG, config->config); | |
477 | max17042_override_por(client, MAX17042_SHDNTIMER, config->shdntimer); | |
478 | ||
479 | max17042_override_por(client, MAX17042_DesignCap, config->design_cap); | |
480 | max17042_override_por(client, MAX17042_ICHGTerm, config->ichgt_term); | |
481 | ||
482 | max17042_override_por(client, MAX17042_AtRate, config->at_rate); | |
483 | max17042_override_por(client, MAX17042_LearnCFG, config->learn_cfg); | |
484 | max17042_override_por(client, MAX17042_FilterCFG, config->filter_cfg); | |
485 | max17042_override_por(client, MAX17042_RelaxCFG, config->relax_cfg); | |
486 | max17042_override_por(client, MAX17042_MiscCFG, config->misc_cfg); | |
487 | max17042_override_por(client, MAX17042_MaskSOC, config->masksoc); | |
488 | ||
489 | max17042_override_por(client, MAX17042_FullCAP, config->fullcap); | |
490 | max17042_override_por(client, MAX17042_FullCAPNom, config->fullcapnom); | |
491 | max17042_override_por(client, MAX17042_SOC_empty, config->socempty); | |
492 | max17042_override_por(client, MAX17042_LAvg_empty, config->lavg_empty); | |
493 | max17042_override_por(client, MAX17042_dQacc, config->dqacc); | |
494 | max17042_override_por(client, MAX17042_dPacc, config->dpacc); | |
495 | ||
496 | max17042_override_por(client, MAX17042_V_empty, config->vempty); | |
497 | max17042_override_por(client, MAX17042_TempNom, config->temp_nom); | |
498 | max17042_override_por(client, MAX17042_TempLim, config->temp_lim); | |
499 | max17042_override_por(client, MAX17042_FCTC, config->fctc); | |
500 | max17042_override_por(client, MAX17042_RCOMP0, config->rcomp0); | |
501 | max17042_override_por(client, MAX17042_TempCo, config->tcompc0); | |
502 | max17042_override_por(client, MAX17042_EmptyTempCo, | |
503 | config->empty_tempco); | |
504 | max17042_override_por(client, MAX17042_K_empty0, config->kempty0); | |
505 | } | |
506 | ||
507 | static int max17042_init_chip(struct max17042_chip *chip) | |
508 | { | |
509 | int ret; | |
510 | int val; | |
511 | ||
512 | max17042_override_por_values(chip); | |
513 | /* After Power up, the MAX17042 requires 500mS in order | |
514 | * to perform signal debouncing and initial SOC reporting | |
515 | */ | |
516 | msleep(500); | |
517 | ||
518 | /* Initialize configaration */ | |
519 | max17042_write_config_regs(chip); | |
520 | ||
521 | /* write cell characterization data */ | |
522 | ret = max17042_init_model(chip); | |
523 | if (ret) { | |
524 | dev_err(&chip->client->dev, "%s init failed\n", | |
525 | __func__); | |
526 | return -EIO; | |
527 | } | |
528 | max17042_verify_model_lock(chip); | |
529 | if (ret) { | |
530 | dev_err(&chip->client->dev, "%s lock verify failed\n", | |
531 | __func__); | |
532 | return -EIO; | |
533 | } | |
534 | /* write custom parameters */ | |
535 | max17042_write_custom_regs(chip); | |
536 | ||
537 | /* update capacity params */ | |
538 | max17042_update_capacity_regs(chip); | |
539 | ||
540 | /* delay must be atleast 350mS to allow VFSOC | |
541 | * to be calculated from the new configuration | |
542 | */ | |
543 | msleep(350); | |
544 | ||
545 | /* reset vfsoc0 reg */ | |
546 | max17042_reset_vfsoc0_reg(chip); | |
547 | ||
548 | /* load new capacity params */ | |
549 | max17042_load_new_capacity_params(chip); | |
550 | ||
551 | /* Init complete, Clear the POR bit */ | |
552 | val = max17042_read_reg(chip->client, MAX17042_STATUS); | |
553 | max17042_write_reg(chip->client, MAX17042_STATUS, | |
554 | val & (~STATUS_POR_BIT)); | |
555 | return 0; | |
556 | } | |
557 | ||
e5f3872d RP |
558 | static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off) |
559 | { | |
560 | u16 soc, soc_tr; | |
561 | ||
562 | /* program interrupt thesholds such that we should | |
563 | * get interrupt for every 'off' perc change in the soc | |
564 | */ | |
565 | soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8; | |
566 | soc_tr = (soc + off) << 8; | |
567 | soc_tr |= (soc - off); | |
568 | max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr); | |
569 | } | |
570 | ||
e5f3872d RP |
571 | static irqreturn_t max17042_thread_handler(int id, void *dev) |
572 | { | |
573 | struct max17042_chip *chip = dev; | |
574 | u16 val; | |
575 | ||
576 | val = max17042_read_reg(chip->client, MAX17042_STATUS); | |
5cdd4d7f RP |
577 | if ((val & STATUS_INTR_SOCMIN_BIT) || |
578 | (val & STATUS_INTR_SOCMAX_BIT)) { | |
e5f3872d RP |
579 | dev_info(&chip->client->dev, "SOC threshold INTR\n"); |
580 | max17042_set_soc_threshold(chip, 1); | |
581 | } | |
582 | ||
583 | power_supply_changed(&chip->battery); | |
584 | return IRQ_HANDLED; | |
585 | } | |
f3a71a6e RP |
586 | |
587 | static void max17042_init_worker(struct work_struct *work) | |
588 | { | |
589 | struct max17042_chip *chip = container_of(work, | |
590 | struct max17042_chip, work); | |
591 | int ret; | |
592 | ||
593 | /* Initialize registers according to values from the platform data */ | |
594 | if (chip->pdata->enable_por_init && chip->pdata->config_data) { | |
595 | ret = max17042_init_chip(chip); | |
596 | if (ret) | |
597 | return; | |
598 | } | |
599 | ||
600 | chip->init_complete = 1; | |
601 | } | |
602 | ||
3832246d KL |
603 | #ifdef CONFIG_OF |
604 | static struct max17042_platform_data * | |
605 | max17042_get_pdata(struct device *dev) | |
606 | { | |
607 | struct device_node *np = dev->of_node; | |
608 | u32 prop; | |
609 | struct max17042_platform_data *pdata; | |
610 | ||
611 | if (!np) | |
612 | return dev->platform_data; | |
613 | ||
614 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
615 | if (!pdata) | |
616 | return NULL; | |
617 | ||
618 | /* | |
619 | * Require current sense resistor value to be specified for | |
620 | * current-sense functionality to be enabled at all. | |
621 | */ | |
622 | if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) { | |
623 | pdata->r_sns = prop; | |
624 | pdata->enable_current_sense = true; | |
625 | } | |
626 | ||
627 | return pdata; | |
628 | } | |
629 | #else | |
630 | static struct max17042_platform_data * | |
631 | max17042_get_pdata(struct device *dev) | |
632 | { | |
633 | return dev->platform_data; | |
634 | } | |
635 | #endif | |
636 | ||
359ab9f5 MH |
637 | static int __devinit max17042_probe(struct i2c_client *client, |
638 | const struct i2c_device_id *id) | |
639 | { | |
640 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
641 | struct max17042_chip *chip; | |
642 | int ret; | |
f3a71a6e | 643 | int reg; |
359ab9f5 MH |
644 | |
645 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) | |
646 | return -EIO; | |
647 | ||
2f3b4342 | 648 | chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); |
359ab9f5 MH |
649 | if (!chip) |
650 | return -ENOMEM; | |
651 | ||
652 | chip->client = client; | |
3832246d KL |
653 | chip->pdata = max17042_get_pdata(&client->dev); |
654 | if (!chip->pdata) { | |
655 | dev_err(&client->dev, "no platform data provided\n"); | |
656 | return -EINVAL; | |
657 | } | |
359ab9f5 MH |
658 | |
659 | i2c_set_clientdata(client, chip); | |
660 | ||
661 | chip->battery.name = "max17042_battery"; | |
662 | chip->battery.type = POWER_SUPPLY_TYPE_BATTERY; | |
663 | chip->battery.get_property = max17042_get_property; | |
664 | chip->battery.properties = max17042_battery_props; | |
665 | chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props); | |
666 | ||
086ef502 DK |
667 | /* When current is not measured, |
668 | * CURRENT_NOW and CURRENT_AVG properties should be invisible. */ | |
669 | if (!chip->pdata->enable_current_sense) | |
670 | chip->battery.num_properties -= 2; | |
671 | ||
4cfa892c PR |
672 | if (chip->pdata->r_sns == 0) |
673 | chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR; | |
674 | ||
086ef502 DK |
675 | if (chip->pdata->init_data) |
676 | max17042_set_reg(client, chip->pdata->init_data, | |
f3a71a6e | 677 | chip->pdata->num_init_data); |
086ef502 | 678 | |
359ab9f5 MH |
679 | if (!chip->pdata->enable_current_sense) { |
680 | max17042_write_reg(client, MAX17042_CGAIN, 0x0000); | |
681 | max17042_write_reg(client, MAX17042_MiscCFG, 0x0003); | |
682 | max17042_write_reg(client, MAX17042_LearnCFG, 0x0007); | |
683 | } | |
684 | ||
e5f3872d | 685 | if (client->irq) { |
5cdd4d7f | 686 | ret = request_threaded_irq(client->irq, NULL, |
e5f3872d | 687 | max17042_thread_handler, |
5cdd4d7f RP |
688 | IRQF_TRIGGER_FALLING, |
689 | chip->battery.name, chip); | |
e5f3872d RP |
690 | if (!ret) { |
691 | reg = max17042_read_reg(client, MAX17042_CONFIG); | |
692 | reg |= CONFIG_ALRT_BIT_ENBL; | |
693 | max17042_write_reg(client, MAX17042_CONFIG, reg); | |
694 | max17042_set_soc_threshold(chip, 1); | |
695 | } else | |
696 | dev_err(&client->dev, "%s(): cannot get IRQ\n", | |
697 | __func__); | |
698 | } | |
699 | ||
f3a71a6e RP |
700 | reg = max17042_read_reg(chip->client, MAX17042_STATUS); |
701 | ||
702 | if (reg & STATUS_POR_BIT) { | |
703 | INIT_WORK(&chip->work, max17042_init_worker); | |
704 | schedule_work(&chip->work); | |
705 | } else { | |
706 | chip->init_complete = 1; | |
707 | } | |
708 | ||
709 | ret = power_supply_register(&client->dev, &chip->battery); | |
2f3b4342 | 710 | if (ret) |
f3a71a6e | 711 | dev_err(&client->dev, "failed: power supply register\n"); |
f3a71a6e | 712 | return ret; |
359ab9f5 MH |
713 | } |
714 | ||
715 | static int __devexit max17042_remove(struct i2c_client *client) | |
716 | { | |
717 | struct max17042_chip *chip = i2c_get_clientdata(client); | |
718 | ||
bb28da90 RP |
719 | if (client->irq) |
720 | free_irq(client->irq, chip); | |
359ab9f5 | 721 | power_supply_unregister(&chip->battery); |
359ab9f5 MH |
722 | return 0; |
723 | } | |
724 | ||
48bc1774 RP |
725 | #ifdef CONFIG_PM |
726 | static int max17042_suspend(struct device *dev) | |
727 | { | |
728 | struct max17042_chip *chip = dev_get_drvdata(dev); | |
729 | ||
48e41c70 AV |
730 | /* |
731 | * disable the irq and enable irq_wake | |
48bc1774 RP |
732 | * capability to the interrupt line. |
733 | */ | |
734 | if (chip->client->irq) { | |
735 | disable_irq(chip->client->irq); | |
736 | enable_irq_wake(chip->client->irq); | |
737 | } | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
742 | static int max17042_resume(struct device *dev) | |
743 | { | |
744 | struct max17042_chip *chip = dev_get_drvdata(dev); | |
745 | ||
746 | if (chip->client->irq) { | |
747 | disable_irq_wake(chip->client->irq); | |
748 | enable_irq(chip->client->irq); | |
749 | /* re-program the SOC thresholds to 1% change */ | |
750 | max17042_set_soc_threshold(chip, 1); | |
751 | } | |
752 | ||
753 | return 0; | |
754 | } | |
48e41c70 AV |
755 | |
756 | static const struct dev_pm_ops max17042_pm_ops = { | |
757 | .suspend = max17042_suspend, | |
758 | .resume = max17042_resume, | |
759 | }; | |
760 | ||
761 | #define MAX17042_PM_OPS (&max17042_pm_ops) | |
48bc1774 | 762 | #else |
48e41c70 | 763 | #define MAX17042_PM_OPS NULL |
48bc1774 RP |
764 | #endif |
765 | ||
3832246d KL |
766 | #ifdef CONFIG_OF |
767 | static const struct of_device_id max17042_dt_match[] = { | |
768 | { .compatible = "maxim,max17042" }, | |
769 | { }, | |
770 | }; | |
771 | MODULE_DEVICE_TABLE(of, max17042_dt_match); | |
772 | #endif | |
773 | ||
359ab9f5 MH |
774 | static const struct i2c_device_id max17042_id[] = { |
775 | { "max17042", 0 }, | |
776 | { } | |
777 | }; | |
778 | MODULE_DEVICE_TABLE(i2c, max17042_id); | |
779 | ||
780 | static struct i2c_driver max17042_i2c_driver = { | |
781 | .driver = { | |
782 | .name = "max17042", | |
3832246d | 783 | .of_match_table = of_match_ptr(max17042_dt_match), |
48e41c70 | 784 | .pm = MAX17042_PM_OPS, |
359ab9f5 MH |
785 | }, |
786 | .probe = max17042_probe, | |
787 | .remove = __devexit_p(max17042_remove), | |
788 | .id_table = max17042_id, | |
789 | }; | |
5ff92e7a | 790 | module_i2c_driver(max17042_i2c_driver); |
359ab9f5 MH |
791 | |
792 | MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); | |
793 | MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); | |
794 | MODULE_LICENSE("GPL"); |