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275ac746 CB |
1 | /* |
2 | * 1-wire client/driver for the Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC | |
3 | * | |
4 | * Copyright (C) 2010 Indesign, LLC | |
5 | * | |
6 | * Author: Clifton Barnes <cabarnes@indesign-llc.com> | |
7 | * | |
8 | * Based on ds2760_battery and ds2782_battery drivers | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/param.h> | |
19 | #include <linux/pm.h> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/power_supply.h> | |
22 | #include <linux/idr.h> | |
23 | ||
24 | #include "../w1/w1.h" | |
25 | #include "../w1/slaves/w1_ds2780.h" | |
26 | ||
27 | /* Current unit measurement in uA for a 1 milli-ohm sense resistor */ | |
28 | #define DS2780_CURRENT_UNITS 1563 | |
29 | /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */ | |
30 | #define DS2780_CHARGE_UNITS 6250 | |
31 | /* Number of bytes in user EEPROM space */ | |
32 | #define DS2780_USER_EEPROM_SIZE (DS2780_EEPROM_BLOCK0_END - \ | |
33 | DS2780_EEPROM_BLOCK0_START + 1) | |
34 | /* Number of bytes in parameter EEPROM space */ | |
35 | #define DS2780_PARAM_EEPROM_SIZE (DS2780_EEPROM_BLOCK1_END - \ | |
36 | DS2780_EEPROM_BLOCK1_START + 1) | |
37 | ||
38 | struct ds2780_device_info { | |
39 | struct device *dev; | |
297d716f KK |
40 | struct power_supply *bat; |
41 | struct power_supply_desc bat_desc; | |
275ac746 CB |
42 | struct device *w1_dev; |
43 | }; | |
44 | ||
45 | enum current_types { | |
46 | CURRENT_NOW, | |
47 | CURRENT_AVG, | |
48 | }; | |
49 | ||
50 | static const char model[] = "DS2780"; | |
51 | static const char manufacturer[] = "Maxim/Dallas"; | |
52 | ||
853eee72 CB |
53 | static inline struct ds2780_device_info * |
54 | to_ds2780_device_info(struct power_supply *psy) | |
275ac746 | 55 | { |
297d716f | 56 | return power_supply_get_drvdata(psy); |
275ac746 CB |
57 | } |
58 | ||
59 | static inline struct power_supply *to_power_supply(struct device *dev) | |
60 | { | |
61 | return dev_get_drvdata(dev); | |
62 | } | |
63 | ||
853eee72 CB |
64 | static inline int ds2780_battery_io(struct ds2780_device_info *dev_info, |
65 | char *buf, int addr, size_t count, int io) | |
275ac746 | 66 | { |
b02f8bed | 67 | return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io); |
275ac746 CB |
68 | } |
69 | ||
853eee72 CB |
70 | static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val, |
71 | int addr) | |
72 | { | |
73 | return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0); | |
275ac746 CB |
74 | } |
75 | ||
853eee72 CB |
76 | static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val, |
77 | int addr) | |
275ac746 CB |
78 | { |
79 | int ret; | |
80 | u8 raw[2]; | |
81 | ||
853eee72 | 82 | ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0); |
275ac746 CB |
83 | if (ret < 0) |
84 | return ret; | |
85 | ||
86 | *val = (raw[0] << 8) | raw[1]; | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
853eee72 CB |
91 | static inline int ds2780_read_block(struct ds2780_device_info *dev_info, |
92 | u8 *val, int addr, size_t count) | |
275ac746 | 93 | { |
853eee72 | 94 | return ds2780_battery_io(dev_info, val, addr, count, 0); |
275ac746 CB |
95 | } |
96 | ||
853eee72 CB |
97 | static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val, |
98 | int addr, size_t count) | |
275ac746 | 99 | { |
853eee72 | 100 | return ds2780_battery_io(dev_info, val, addr, count, 1); |
275ac746 CB |
101 | } |
102 | ||
103 | static inline int ds2780_store_eeprom(struct device *dev, int addr) | |
104 | { | |
105 | return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA); | |
106 | } | |
107 | ||
108 | static inline int ds2780_recall_eeprom(struct device *dev, int addr) | |
109 | { | |
110 | return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA); | |
111 | } | |
112 | ||
113 | static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg) | |
114 | { | |
115 | int ret; | |
116 | ||
117 | ret = ds2780_store_eeprom(dev_info->w1_dev, reg); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | ||
121 | ret = ds2780_recall_eeprom(dev_info->w1_dev, reg); | |
122 | if (ret < 0) | |
123 | return ret; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | /* Set sense resistor value in mhos */ | |
129 | static int ds2780_set_sense_register(struct ds2780_device_info *dev_info, | |
130 | u8 conductance) | |
131 | { | |
132 | int ret; | |
133 | ||
853eee72 | 134 | ret = ds2780_write(dev_info, &conductance, |
275ac746 CB |
135 | DS2780_RSNSP_REG, sizeof(u8)); |
136 | if (ret < 0) | |
137 | return ret; | |
138 | ||
139 | return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG); | |
140 | } | |
141 | ||
142 | /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
143 | static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info, | |
144 | u16 *rsgain) | |
145 | { | |
853eee72 | 146 | return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG); |
275ac746 CB |
147 | } |
148 | ||
149 | /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
150 | static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info, | |
151 | u16 rsgain) | |
152 | { | |
153 | int ret; | |
154 | u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; | |
155 | ||
853eee72 CB |
156 | ret = ds2780_write(dev_info, raw, |
157 | DS2780_RSGAIN_MSB_REG, sizeof(raw)); | |
275ac746 CB |
158 | if (ret < 0) |
159 | return ret; | |
160 | ||
161 | return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG); | |
162 | } | |
163 | ||
164 | static int ds2780_get_voltage(struct ds2780_device_info *dev_info, | |
165 | int *voltage_uV) | |
166 | { | |
167 | int ret; | |
168 | s16 voltage_raw; | |
169 | ||
170 | /* | |
171 | * The voltage value is located in 10 bits across the voltage MSB | |
172 | * and LSB registers in two's compliment form | |
173 | * Sign bit of the voltage value is in bit 7 of the voltage MSB register | |
174 | * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the | |
175 | * voltage MSB register | |
176 | * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the | |
177 | * voltage LSB register | |
178 | */ | |
853eee72 | 179 | ret = ds2780_read16(dev_info, &voltage_raw, |
275ac746 CB |
180 | DS2780_VOLT_MSB_REG); |
181 | if (ret < 0) | |
182 | return ret; | |
183 | ||
184 | /* | |
185 | * DS2780 reports voltage in units of 4.88mV, but the battery class | |
186 | * reports in units of uV, so convert by multiplying by 4880. | |
187 | */ | |
188 | *voltage_uV = (voltage_raw / 32) * 4880; | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static int ds2780_get_temperature(struct ds2780_device_info *dev_info, | |
193 | int *temperature) | |
194 | { | |
195 | int ret; | |
196 | s16 temperature_raw; | |
197 | ||
198 | /* | |
199 | * The temperature value is located in 10 bits across the temperature | |
200 | * MSB and LSB registers in two's compliment form | |
201 | * Sign bit of the temperature value is in bit 7 of the temperature | |
202 | * MSB register | |
203 | * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the | |
204 | * temperature MSB register | |
205 | * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the | |
206 | * temperature LSB register | |
207 | */ | |
853eee72 | 208 | ret = ds2780_read16(dev_info, &temperature_raw, |
275ac746 CB |
209 | DS2780_TEMP_MSB_REG); |
210 | if (ret < 0) | |
211 | return ret; | |
212 | ||
213 | /* | |
214 | * Temperature is measured in units of 0.125 degrees celcius, the | |
215 | * power_supply class measures temperature in tenths of degrees | |
216 | * celsius. The temperature value is stored as a 10 bit number, plus | |
217 | * sign in the upper bits of a 16 bit register. | |
218 | */ | |
219 | *temperature = ((temperature_raw / 32) * 125) / 100; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | static int ds2780_get_current(struct ds2780_device_info *dev_info, | |
224 | enum current_types type, int *current_uA) | |
225 | { | |
226 | int ret, sense_res; | |
227 | s16 current_raw; | |
228 | u8 sense_res_raw, reg_msb; | |
229 | ||
230 | /* | |
231 | * The units of measurement for current are dependent on the value of | |
232 | * the sense resistor. | |
233 | */ | |
853eee72 | 234 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
275ac746 CB |
235 | if (ret < 0) |
236 | return ret; | |
237 | ||
238 | if (sense_res_raw == 0) { | |
239 | dev_err(dev_info->dev, "sense resistor value is 0\n"); | |
853eee72 | 240 | return -EINVAL; |
275ac746 CB |
241 | } |
242 | sense_res = 1000 / sense_res_raw; | |
243 | ||
244 | if (type == CURRENT_NOW) | |
245 | reg_msb = DS2780_CURRENT_MSB_REG; | |
246 | else if (type == CURRENT_AVG) | |
247 | reg_msb = DS2780_IAVG_MSB_REG; | |
248 | else | |
249 | return -EINVAL; | |
250 | ||
251 | /* | |
252 | * The current value is located in 16 bits across the current MSB | |
253 | * and LSB registers in two's compliment form | |
254 | * Sign bit of the current value is in bit 7 of the current MSB register | |
255 | * Bits 14 - 8 of the current value are in bits 6 - 0 of the current | |
256 | * MSB register | |
257 | * Bits 7 - 0 of the current value are in bits 7 - 0 of the current | |
258 | * LSB register | |
259 | */ | |
853eee72 | 260 | ret = ds2780_read16(dev_info, ¤t_raw, reg_msb); |
275ac746 CB |
261 | if (ret < 0) |
262 | return ret; | |
263 | ||
264 | *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info, | |
269 | int *accumulated_current) | |
270 | { | |
271 | int ret, sense_res; | |
272 | s16 current_raw; | |
273 | u8 sense_res_raw; | |
274 | ||
275 | /* | |
276 | * The units of measurement for accumulated current are dependent on | |
277 | * the value of the sense resistor. | |
278 | */ | |
853eee72 | 279 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
275ac746 CB |
280 | if (ret < 0) |
281 | return ret; | |
282 | ||
283 | if (sense_res_raw == 0) { | |
284 | dev_err(dev_info->dev, "sense resistor value is 0\n"); | |
285 | return -ENXIO; | |
286 | } | |
287 | sense_res = 1000 / sense_res_raw; | |
288 | ||
289 | /* | |
290 | * The ACR value is located in 16 bits across the ACR MSB and | |
291 | * LSB registers | |
292 | * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR | |
293 | * MSB register | |
294 | * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR | |
295 | * LSB register | |
296 | */ | |
853eee72 | 297 | ret = ds2780_read16(dev_info, ¤t_raw, DS2780_ACR_MSB_REG); |
275ac746 CB |
298 | if (ret < 0) |
299 | return ret; | |
300 | ||
301 | *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int ds2780_get_capacity(struct ds2780_device_info *dev_info, | |
306 | int *capacity) | |
307 | { | |
308 | int ret; | |
309 | u8 raw; | |
310 | ||
853eee72 | 311 | ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG); |
275ac746 CB |
312 | if (ret < 0) |
313 | return ret; | |
314 | ||
315 | *capacity = raw; | |
316 | return raw; | |
317 | } | |
318 | ||
319 | static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status) | |
320 | { | |
321 | int ret, current_uA, capacity; | |
322 | ||
323 | ret = ds2780_get_current(dev_info, CURRENT_NOW, ¤t_uA); | |
324 | if (ret < 0) | |
325 | return ret; | |
326 | ||
327 | ret = ds2780_get_capacity(dev_info, &capacity); | |
328 | if (ret < 0) | |
329 | return ret; | |
330 | ||
331 | if (capacity == 100) | |
332 | *status = POWER_SUPPLY_STATUS_FULL; | |
333 | else if (current_uA == 0) | |
334 | *status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
335 | else if (current_uA < 0) | |
336 | *status = POWER_SUPPLY_STATUS_DISCHARGING; | |
337 | else | |
338 | *status = POWER_SUPPLY_STATUS_CHARGING; | |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
343 | static int ds2780_get_charge_now(struct ds2780_device_info *dev_info, | |
344 | int *charge_now) | |
345 | { | |
346 | int ret; | |
347 | u16 charge_raw; | |
348 | ||
349 | /* | |
350 | * The RAAC value is located in 16 bits across the RAAC MSB and | |
351 | * LSB registers | |
352 | * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC | |
353 | * MSB register | |
354 | * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC | |
355 | * LSB register | |
356 | */ | |
853eee72 | 357 | ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG); |
275ac746 CB |
358 | if (ret < 0) |
359 | return ret; | |
360 | ||
361 | *charge_now = charge_raw * 1600; | |
362 | return 0; | |
363 | } | |
364 | ||
365 | static int ds2780_get_control_register(struct ds2780_device_info *dev_info, | |
366 | u8 *control_reg) | |
367 | { | |
853eee72 | 368 | return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG); |
275ac746 CB |
369 | } |
370 | ||
371 | static int ds2780_set_control_register(struct ds2780_device_info *dev_info, | |
372 | u8 control_reg) | |
373 | { | |
374 | int ret; | |
375 | ||
853eee72 | 376 | ret = ds2780_write(dev_info, &control_reg, |
275ac746 CB |
377 | DS2780_CONTROL_REG, sizeof(u8)); |
378 | if (ret < 0) | |
379 | return ret; | |
380 | ||
381 | return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG); | |
382 | } | |
383 | ||
384 | static int ds2780_battery_get_property(struct power_supply *psy, | |
385 | enum power_supply_property psp, | |
386 | union power_supply_propval *val) | |
387 | { | |
388 | int ret = 0; | |
389 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
390 | ||
391 | switch (psp) { | |
392 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
393 | ret = ds2780_get_voltage(dev_info, &val->intval); | |
394 | break; | |
395 | ||
396 | case POWER_SUPPLY_PROP_TEMP: | |
397 | ret = ds2780_get_temperature(dev_info, &val->intval); | |
398 | break; | |
399 | ||
400 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
401 | val->strval = model; | |
402 | break; | |
403 | ||
404 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
405 | val->strval = manufacturer; | |
406 | break; | |
407 | ||
408 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
409 | ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval); | |
410 | break; | |
411 | ||
412 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
413 | ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval); | |
414 | break; | |
415 | ||
416 | case POWER_SUPPLY_PROP_STATUS: | |
417 | ret = ds2780_get_status(dev_info, &val->intval); | |
418 | break; | |
419 | ||
420 | case POWER_SUPPLY_PROP_CAPACITY: | |
421 | ret = ds2780_get_capacity(dev_info, &val->intval); | |
422 | break; | |
423 | ||
424 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: | |
425 | ret = ds2780_get_accumulated_current(dev_info, &val->intval); | |
426 | break; | |
427 | ||
428 | case POWER_SUPPLY_PROP_CHARGE_NOW: | |
429 | ret = ds2780_get_charge_now(dev_info, &val->intval); | |
430 | break; | |
431 | ||
432 | default: | |
433 | ret = -EINVAL; | |
434 | } | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
439 | static enum power_supply_property ds2780_battery_props[] = { | |
440 | POWER_SUPPLY_PROP_STATUS, | |
441 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
442 | POWER_SUPPLY_PROP_TEMP, | |
443 | POWER_SUPPLY_PROP_MODEL_NAME, | |
444 | POWER_SUPPLY_PROP_MANUFACTURER, | |
445 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
446 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
447 | POWER_SUPPLY_PROP_CAPACITY, | |
448 | POWER_SUPPLY_PROP_CHARGE_COUNTER, | |
449 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
450 | }; | |
451 | ||
452 | static ssize_t ds2780_get_pmod_enabled(struct device *dev, | |
453 | struct device_attribute *attr, | |
454 | char *buf) | |
455 | { | |
456 | int ret; | |
457 | u8 control_reg; | |
458 | struct power_supply *psy = to_power_supply(dev); | |
459 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
460 | ||
461 | /* Get power mode */ | |
462 | ret = ds2780_get_control_register(dev_info, &control_reg); | |
463 | if (ret < 0) | |
464 | return ret; | |
465 | ||
466 | return sprintf(buf, "%d\n", | |
467 | !!(control_reg & DS2780_CONTROL_REG_PMOD)); | |
468 | } | |
469 | ||
470 | static ssize_t ds2780_set_pmod_enabled(struct device *dev, | |
471 | struct device_attribute *attr, | |
472 | const char *buf, | |
473 | size_t count) | |
474 | { | |
475 | int ret; | |
476 | u8 control_reg, new_setting; | |
477 | struct power_supply *psy = to_power_supply(dev); | |
478 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
479 | ||
480 | /* Set power mode */ | |
481 | ret = ds2780_get_control_register(dev_info, &control_reg); | |
482 | if (ret < 0) | |
483 | return ret; | |
484 | ||
485 | ret = kstrtou8(buf, 0, &new_setting); | |
486 | if (ret < 0) | |
487 | return ret; | |
488 | ||
489 | if ((new_setting != 0) && (new_setting != 1)) { | |
490 | dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n"); | |
491 | return -EINVAL; | |
492 | } | |
493 | ||
494 | if (new_setting) | |
495 | control_reg |= DS2780_CONTROL_REG_PMOD; | |
496 | else | |
497 | control_reg &= ~DS2780_CONTROL_REG_PMOD; | |
498 | ||
499 | ret = ds2780_set_control_register(dev_info, control_reg); | |
500 | if (ret < 0) | |
501 | return ret; | |
502 | ||
503 | return count; | |
504 | } | |
505 | ||
506 | static ssize_t ds2780_get_sense_resistor_value(struct device *dev, | |
507 | struct device_attribute *attr, | |
508 | char *buf) | |
509 | { | |
510 | int ret; | |
511 | u8 sense_resistor; | |
512 | struct power_supply *psy = to_power_supply(dev); | |
513 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
514 | ||
853eee72 | 515 | ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG); |
275ac746 CB |
516 | if (ret < 0) |
517 | return ret; | |
518 | ||
519 | ret = sprintf(buf, "%d\n", sense_resistor); | |
520 | return ret; | |
521 | } | |
522 | ||
523 | static ssize_t ds2780_set_sense_resistor_value(struct device *dev, | |
524 | struct device_attribute *attr, | |
525 | const char *buf, | |
526 | size_t count) | |
527 | { | |
528 | int ret; | |
529 | u8 new_setting; | |
530 | struct power_supply *psy = to_power_supply(dev); | |
531 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
532 | ||
533 | ret = kstrtou8(buf, 0, &new_setting); | |
534 | if (ret < 0) | |
535 | return ret; | |
536 | ||
537 | ret = ds2780_set_sense_register(dev_info, new_setting); | |
538 | if (ret < 0) | |
539 | return ret; | |
540 | ||
541 | return count; | |
542 | } | |
543 | ||
544 | static ssize_t ds2780_get_rsgain_setting(struct device *dev, | |
545 | struct device_attribute *attr, | |
546 | char *buf) | |
547 | { | |
548 | int ret; | |
549 | u16 rsgain; | |
550 | struct power_supply *psy = to_power_supply(dev); | |
551 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
552 | ||
553 | ret = ds2780_get_rsgain_register(dev_info, &rsgain); | |
554 | if (ret < 0) | |
555 | return ret; | |
556 | ||
557 | return sprintf(buf, "%d\n", rsgain); | |
558 | } | |
559 | ||
560 | static ssize_t ds2780_set_rsgain_setting(struct device *dev, | |
561 | struct device_attribute *attr, | |
562 | const char *buf, | |
563 | size_t count) | |
564 | { | |
565 | int ret; | |
566 | u16 new_setting; | |
567 | struct power_supply *psy = to_power_supply(dev); | |
568 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
569 | ||
570 | ret = kstrtou16(buf, 0, &new_setting); | |
571 | if (ret < 0) | |
572 | return ret; | |
573 | ||
574 | /* Gain can only be from 0 to 1.999 in steps of .001 */ | |
575 | if (new_setting > 1999) { | |
576 | dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n"); | |
577 | return -EINVAL; | |
578 | } | |
579 | ||
580 | ret = ds2780_set_rsgain_register(dev_info, new_setting); | |
581 | if (ret < 0) | |
582 | return ret; | |
583 | ||
584 | return count; | |
585 | } | |
586 | ||
587 | static ssize_t ds2780_get_pio_pin(struct device *dev, | |
588 | struct device_attribute *attr, | |
589 | char *buf) | |
590 | { | |
591 | int ret; | |
592 | u8 sfr; | |
593 | struct power_supply *psy = to_power_supply(dev); | |
594 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
595 | ||
853eee72 | 596 | ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG); |
275ac746 CB |
597 | if (ret < 0) |
598 | return ret; | |
599 | ||
600 | ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC); | |
601 | return ret; | |
602 | } | |
603 | ||
604 | static ssize_t ds2780_set_pio_pin(struct device *dev, | |
605 | struct device_attribute *attr, | |
606 | const char *buf, | |
607 | size_t count) | |
608 | { | |
609 | int ret; | |
610 | u8 new_setting; | |
611 | struct power_supply *psy = to_power_supply(dev); | |
612 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
613 | ||
614 | ret = kstrtou8(buf, 0, &new_setting); | |
615 | if (ret < 0) | |
616 | return ret; | |
617 | ||
618 | if ((new_setting != 0) && (new_setting != 1)) { | |
619 | dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n"); | |
620 | return -EINVAL; | |
621 | } | |
622 | ||
853eee72 | 623 | ret = ds2780_write(dev_info, &new_setting, |
275ac746 CB |
624 | DS2780_SFR_REG, sizeof(u8)); |
625 | if (ret < 0) | |
626 | return ret; | |
627 | ||
628 | return count; | |
629 | } | |
630 | ||
631 | static ssize_t ds2780_read_param_eeprom_bin(struct file *filp, | |
632 | struct kobject *kobj, | |
633 | struct bin_attribute *bin_attr, | |
634 | char *buf, loff_t off, size_t count) | |
635 | { | |
636 | struct device *dev = container_of(kobj, struct device, kobj); | |
637 | struct power_supply *psy = to_power_supply(dev); | |
638 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
639 | ||
853eee72 | 640 | return ds2780_read_block(dev_info, buf, |
275ac746 CB |
641 | DS2780_EEPROM_BLOCK1_START + off, count); |
642 | } | |
643 | ||
644 | static ssize_t ds2780_write_param_eeprom_bin(struct file *filp, | |
645 | struct kobject *kobj, | |
646 | struct bin_attribute *bin_attr, | |
647 | char *buf, loff_t off, size_t count) | |
648 | { | |
649 | struct device *dev = container_of(kobj, struct device, kobj); | |
650 | struct power_supply *psy = to_power_supply(dev); | |
651 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
652 | int ret; | |
653 | ||
853eee72 | 654 | ret = ds2780_write(dev_info, buf, |
275ac746 CB |
655 | DS2780_EEPROM_BLOCK1_START + off, count); |
656 | if (ret < 0) | |
657 | return ret; | |
658 | ||
659 | ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START); | |
660 | if (ret < 0) | |
661 | return ret; | |
662 | ||
663 | return count; | |
664 | } | |
665 | ||
666 | static struct bin_attribute ds2780_param_eeprom_bin_attr = { | |
667 | .attr = { | |
668 | .name = "param_eeprom", | |
669 | .mode = S_IRUGO | S_IWUSR, | |
670 | }, | |
753f1583 | 671 | .size = DS2780_PARAM_EEPROM_SIZE, |
275ac746 CB |
672 | .read = ds2780_read_param_eeprom_bin, |
673 | .write = ds2780_write_param_eeprom_bin, | |
674 | }; | |
675 | ||
676 | static ssize_t ds2780_read_user_eeprom_bin(struct file *filp, | |
677 | struct kobject *kobj, | |
678 | struct bin_attribute *bin_attr, | |
679 | char *buf, loff_t off, size_t count) | |
680 | { | |
681 | struct device *dev = container_of(kobj, struct device, kobj); | |
682 | struct power_supply *psy = to_power_supply(dev); | |
683 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
684 | ||
853eee72 | 685 | return ds2780_read_block(dev_info, buf, |
275ac746 | 686 | DS2780_EEPROM_BLOCK0_START + off, count); |
275ac746 CB |
687 | } |
688 | ||
689 | static ssize_t ds2780_write_user_eeprom_bin(struct file *filp, | |
690 | struct kobject *kobj, | |
691 | struct bin_attribute *bin_attr, | |
692 | char *buf, loff_t off, size_t count) | |
693 | { | |
694 | struct device *dev = container_of(kobj, struct device, kobj); | |
695 | struct power_supply *psy = to_power_supply(dev); | |
696 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
697 | int ret; | |
698 | ||
853eee72 | 699 | ret = ds2780_write(dev_info, buf, |
275ac746 CB |
700 | DS2780_EEPROM_BLOCK0_START + off, count); |
701 | if (ret < 0) | |
702 | return ret; | |
703 | ||
704 | ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START); | |
705 | if (ret < 0) | |
706 | return ret; | |
707 | ||
708 | return count; | |
709 | } | |
710 | ||
711 | static struct bin_attribute ds2780_user_eeprom_bin_attr = { | |
712 | .attr = { | |
713 | .name = "user_eeprom", | |
714 | .mode = S_IRUGO | S_IWUSR, | |
715 | }, | |
753f1583 | 716 | .size = DS2780_USER_EEPROM_SIZE, |
275ac746 CB |
717 | .read = ds2780_read_user_eeprom_bin, |
718 | .write = ds2780_write_user_eeprom_bin, | |
719 | }; | |
720 | ||
721 | static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled, | |
722 | ds2780_set_pmod_enabled); | |
723 | static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, | |
724 | ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value); | |
725 | static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting, | |
726 | ds2780_set_rsgain_setting); | |
727 | static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin, | |
728 | ds2780_set_pio_pin); | |
729 | ||
730 | ||
731 | static struct attribute *ds2780_attributes[] = { | |
732 | &dev_attr_pmod_enabled.attr, | |
733 | &dev_attr_sense_resistor_value.attr, | |
734 | &dev_attr_rsgain_setting.attr, | |
735 | &dev_attr_pio_pin.attr, | |
736 | NULL | |
737 | }; | |
738 | ||
739 | static const struct attribute_group ds2780_attr_group = { | |
740 | .attrs = ds2780_attributes, | |
741 | }; | |
742 | ||
c8afa640 | 743 | static int ds2780_battery_probe(struct platform_device *pdev) |
275ac746 | 744 | { |
297d716f | 745 | struct power_supply_config psy_cfg = {}; |
275ac746 CB |
746 | int ret = 0; |
747 | struct ds2780_device_info *dev_info; | |
748 | ||
2cb12122 | 749 | dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL); |
275ac746 CB |
750 | if (!dev_info) { |
751 | ret = -ENOMEM; | |
752 | goto fail; | |
753 | } | |
754 | ||
755 | platform_set_drvdata(pdev, dev_info); | |
756 | ||
757 | dev_info->dev = &pdev->dev; | |
758 | dev_info->w1_dev = pdev->dev.parent; | |
297d716f KK |
759 | dev_info->bat_desc.name = dev_name(&pdev->dev); |
760 | dev_info->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; | |
761 | dev_info->bat_desc.properties = ds2780_battery_props; | |
762 | dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2780_battery_props); | |
763 | dev_info->bat_desc.get_property = ds2780_battery_get_property; | |
275ac746 | 764 | |
297d716f KK |
765 | psy_cfg.drv_data = dev_info; |
766 | ||
767 | dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc, | |
768 | &psy_cfg); | |
769 | if (IS_ERR(dev_info->bat)) { | |
275ac746 | 770 | dev_err(dev_info->dev, "failed to register battery\n"); |
297d716f | 771 | ret = PTR_ERR(dev_info->bat); |
2cb12122 | 772 | goto fail; |
275ac746 CB |
773 | } |
774 | ||
297d716f | 775 | ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2780_attr_group); |
275ac746 CB |
776 | if (ret) { |
777 | dev_err(dev_info->dev, "failed to create sysfs group\n"); | |
778 | goto fail_unregister; | |
779 | } | |
780 | ||
297d716f | 781 | ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, |
275ac746 CB |
782 | &ds2780_param_eeprom_bin_attr); |
783 | if (ret) { | |
784 | dev_err(dev_info->dev, | |
785 | "failed to create param eeprom bin file"); | |
786 | goto fail_remove_group; | |
787 | } | |
788 | ||
297d716f | 789 | ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, |
275ac746 CB |
790 | &ds2780_user_eeprom_bin_attr); |
791 | if (ret) { | |
792 | dev_err(dev_info->dev, | |
793 | "failed to create user eeprom bin file"); | |
794 | goto fail_remove_bin_file; | |
795 | } | |
796 | ||
797 | return 0; | |
798 | ||
799 | fail_remove_bin_file: | |
297d716f | 800 | sysfs_remove_bin_file(&dev_info->bat->dev.kobj, |
275ac746 CB |
801 | &ds2780_param_eeprom_bin_attr); |
802 | fail_remove_group: | |
297d716f | 803 | sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group); |
275ac746 | 804 | fail_unregister: |
297d716f | 805 | power_supply_unregister(dev_info->bat); |
275ac746 CB |
806 | fail: |
807 | return ret; | |
808 | } | |
809 | ||
415ec69f | 810 | static int ds2780_battery_remove(struct platform_device *pdev) |
275ac746 CB |
811 | { |
812 | struct ds2780_device_info *dev_info = platform_get_drvdata(pdev); | |
813 | ||
297d716f KK |
814 | /* |
815 | * Remove attributes before unregistering power supply | |
816 | * because 'bat' will be freed on power_supply_unregister() call. | |
817 | */ | |
818 | sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2780_attr_group); | |
275ac746 | 819 | |
297d716f | 820 | power_supply_unregister(dev_info->bat); |
275ac746 | 821 | |
275ac746 CB |
822 | return 0; |
823 | } | |
824 | ||
275ac746 CB |
825 | static struct platform_driver ds2780_battery_driver = { |
826 | .driver = { | |
827 | .name = "ds2780-battery", | |
828 | }, | |
829 | .probe = ds2780_battery_probe, | |
28ea73f4 | 830 | .remove = ds2780_battery_remove, |
275ac746 CB |
831 | }; |
832 | ||
300bac7f | 833 | module_platform_driver(ds2780_battery_driver); |
275ac746 CB |
834 | |
835 | MODULE_LICENSE("GPL"); | |
836 | MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); | |
837 | MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver"); | |
300bac7f | 838 | MODULE_ALIAS("platform:ds2780-battery"); |