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