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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; | |
40 | struct power_supply bat; | |
41 | struct device *w1_dev; | |
42 | }; | |
43 | ||
44 | enum current_types { | |
45 | CURRENT_NOW, | |
46 | CURRENT_AVG, | |
47 | }; | |
48 | ||
49 | static const char model[] = "DS2780"; | |
50 | static const char manufacturer[] = "Maxim/Dallas"; | |
51 | ||
853eee72 CB |
52 | static inline struct ds2780_device_info * |
53 | to_ds2780_device_info(struct power_supply *psy) | |
275ac746 CB |
54 | { |
55 | return container_of(psy, struct ds2780_device_info, bat); | |
56 | } | |
57 | ||
58 | static inline struct power_supply *to_power_supply(struct device *dev) | |
59 | { | |
60 | return dev_get_drvdata(dev); | |
61 | } | |
62 | ||
853eee72 CB |
63 | static inline int ds2780_battery_io(struct ds2780_device_info *dev_info, |
64 | char *buf, int addr, size_t count, int io) | |
275ac746 | 65 | { |
b02f8bed | 66 | return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io); |
275ac746 CB |
67 | } |
68 | ||
853eee72 CB |
69 | static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val, |
70 | int addr) | |
71 | { | |
72 | return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0); | |
275ac746 CB |
73 | } |
74 | ||
853eee72 CB |
75 | static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val, |
76 | int addr) | |
275ac746 CB |
77 | { |
78 | int ret; | |
79 | u8 raw[2]; | |
80 | ||
853eee72 | 81 | ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0); |
275ac746 CB |
82 | if (ret < 0) |
83 | return ret; | |
84 | ||
85 | *val = (raw[0] << 8) | raw[1]; | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
853eee72 CB |
90 | static inline int ds2780_read_block(struct ds2780_device_info *dev_info, |
91 | u8 *val, int addr, size_t count) | |
275ac746 | 92 | { |
853eee72 | 93 | return ds2780_battery_io(dev_info, val, addr, count, 0); |
275ac746 CB |
94 | } |
95 | ||
853eee72 CB |
96 | static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val, |
97 | int addr, size_t count) | |
275ac746 | 98 | { |
853eee72 | 99 | return ds2780_battery_io(dev_info, val, addr, count, 1); |
275ac746 CB |
100 | } |
101 | ||
102 | static inline int ds2780_store_eeprom(struct device *dev, int addr) | |
103 | { | |
104 | return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA); | |
105 | } | |
106 | ||
107 | static inline int ds2780_recall_eeprom(struct device *dev, int addr) | |
108 | { | |
109 | return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA); | |
110 | } | |
111 | ||
112 | static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg) | |
113 | { | |
114 | int ret; | |
115 | ||
116 | ret = ds2780_store_eeprom(dev_info->w1_dev, reg); | |
117 | if (ret < 0) | |
118 | return ret; | |
119 | ||
120 | ret = ds2780_recall_eeprom(dev_info->w1_dev, reg); | |
121 | if (ret < 0) | |
122 | return ret; | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | /* Set sense resistor value in mhos */ | |
128 | static int ds2780_set_sense_register(struct ds2780_device_info *dev_info, | |
129 | u8 conductance) | |
130 | { | |
131 | int ret; | |
132 | ||
853eee72 | 133 | ret = ds2780_write(dev_info, &conductance, |
275ac746 CB |
134 | DS2780_RSNSP_REG, sizeof(u8)); |
135 | if (ret < 0) | |
136 | return ret; | |
137 | ||
138 | return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG); | |
139 | } | |
140 | ||
141 | /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
142 | static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info, | |
143 | u16 *rsgain) | |
144 | { | |
853eee72 | 145 | return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG); |
275ac746 CB |
146 | } |
147 | ||
148 | /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
149 | static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info, | |
150 | u16 rsgain) | |
151 | { | |
152 | int ret; | |
153 | u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; | |
154 | ||
853eee72 CB |
155 | ret = ds2780_write(dev_info, raw, |
156 | DS2780_RSGAIN_MSB_REG, sizeof(raw)); | |
275ac746 CB |
157 | if (ret < 0) |
158 | return ret; | |
159 | ||
160 | return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG); | |
161 | } | |
162 | ||
163 | static int ds2780_get_voltage(struct ds2780_device_info *dev_info, | |
164 | int *voltage_uV) | |
165 | { | |
166 | int ret; | |
167 | s16 voltage_raw; | |
168 | ||
169 | /* | |
170 | * The voltage value is located in 10 bits across the voltage MSB | |
171 | * and LSB registers in two's compliment form | |
172 | * Sign bit of the voltage value is in bit 7 of the voltage MSB register | |
173 | * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the | |
174 | * voltage MSB register | |
175 | * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the | |
176 | * voltage LSB register | |
177 | */ | |
853eee72 | 178 | ret = ds2780_read16(dev_info, &voltage_raw, |
275ac746 CB |
179 | DS2780_VOLT_MSB_REG); |
180 | if (ret < 0) | |
181 | return ret; | |
182 | ||
183 | /* | |
184 | * DS2780 reports voltage in units of 4.88mV, but the battery class | |
185 | * reports in units of uV, so convert by multiplying by 4880. | |
186 | */ | |
187 | *voltage_uV = (voltage_raw / 32) * 4880; | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int ds2780_get_temperature(struct ds2780_device_info *dev_info, | |
192 | int *temperature) | |
193 | { | |
194 | int ret; | |
195 | s16 temperature_raw; | |
196 | ||
197 | /* | |
198 | * The temperature value is located in 10 bits across the temperature | |
199 | * MSB and LSB registers in two's compliment form | |
200 | * Sign bit of the temperature value is in bit 7 of the temperature | |
201 | * MSB register | |
202 | * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the | |
203 | * temperature MSB register | |
204 | * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the | |
205 | * temperature LSB register | |
206 | */ | |
853eee72 | 207 | ret = ds2780_read16(dev_info, &temperature_raw, |
275ac746 CB |
208 | DS2780_TEMP_MSB_REG); |
209 | if (ret < 0) | |
210 | return ret; | |
211 | ||
212 | /* | |
213 | * Temperature is measured in units of 0.125 degrees celcius, the | |
214 | * power_supply class measures temperature in tenths of degrees | |
215 | * celsius. The temperature value is stored as a 10 bit number, plus | |
216 | * sign in the upper bits of a 16 bit register. | |
217 | */ | |
218 | *temperature = ((temperature_raw / 32) * 125) / 100; | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static int ds2780_get_current(struct ds2780_device_info *dev_info, | |
223 | enum current_types type, int *current_uA) | |
224 | { | |
225 | int ret, sense_res; | |
226 | s16 current_raw; | |
227 | u8 sense_res_raw, reg_msb; | |
228 | ||
229 | /* | |
230 | * The units of measurement for current are dependent on the value of | |
231 | * the sense resistor. | |
232 | */ | |
853eee72 | 233 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
275ac746 CB |
234 | if (ret < 0) |
235 | return ret; | |
236 | ||
237 | if (sense_res_raw == 0) { | |
238 | dev_err(dev_info->dev, "sense resistor value is 0\n"); | |
853eee72 | 239 | return -EINVAL; |
275ac746 CB |
240 | } |
241 | sense_res = 1000 / sense_res_raw; | |
242 | ||
243 | if (type == CURRENT_NOW) | |
244 | reg_msb = DS2780_CURRENT_MSB_REG; | |
245 | else if (type == CURRENT_AVG) | |
246 | reg_msb = DS2780_IAVG_MSB_REG; | |
247 | else | |
248 | return -EINVAL; | |
249 | ||
250 | /* | |
251 | * The current value is located in 16 bits across the current MSB | |
252 | * and LSB registers in two's compliment form | |
253 | * Sign bit of the current value is in bit 7 of the current MSB register | |
254 | * Bits 14 - 8 of the current value are in bits 6 - 0 of the current | |
255 | * MSB register | |
256 | * Bits 7 - 0 of the current value are in bits 7 - 0 of the current | |
257 | * LSB register | |
258 | */ | |
853eee72 | 259 | ret = ds2780_read16(dev_info, ¤t_raw, reg_msb); |
275ac746 CB |
260 | if (ret < 0) |
261 | return ret; | |
262 | ||
263 | *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res); | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info, | |
268 | int *accumulated_current) | |
269 | { | |
270 | int ret, sense_res; | |
271 | s16 current_raw; | |
272 | u8 sense_res_raw; | |
273 | ||
274 | /* | |
275 | * The units of measurement for accumulated current are dependent on | |
276 | * the value of the sense resistor. | |
277 | */ | |
853eee72 | 278 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
275ac746 CB |
279 | if (ret < 0) |
280 | return ret; | |
281 | ||
282 | if (sense_res_raw == 0) { | |
283 | dev_err(dev_info->dev, "sense resistor value is 0\n"); | |
284 | return -ENXIO; | |
285 | } | |
286 | sense_res = 1000 / sense_res_raw; | |
287 | ||
288 | /* | |
289 | * The ACR value is located in 16 bits across the ACR MSB and | |
290 | * LSB registers | |
291 | * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR | |
292 | * MSB register | |
293 | * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR | |
294 | * LSB register | |
295 | */ | |
853eee72 | 296 | ret = ds2780_read16(dev_info, ¤t_raw, DS2780_ACR_MSB_REG); |
275ac746 CB |
297 | if (ret < 0) |
298 | return ret; | |
299 | ||
300 | *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res); | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static int ds2780_get_capacity(struct ds2780_device_info *dev_info, | |
305 | int *capacity) | |
306 | { | |
307 | int ret; | |
308 | u8 raw; | |
309 | ||
853eee72 | 310 | ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG); |
275ac746 CB |
311 | if (ret < 0) |
312 | return ret; | |
313 | ||
314 | *capacity = raw; | |
315 | return raw; | |
316 | } | |
317 | ||
318 | static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status) | |
319 | { | |
320 | int ret, current_uA, capacity; | |
321 | ||
322 | ret = ds2780_get_current(dev_info, CURRENT_NOW, ¤t_uA); | |
323 | if (ret < 0) | |
324 | return ret; | |
325 | ||
326 | ret = ds2780_get_capacity(dev_info, &capacity); | |
327 | if (ret < 0) | |
328 | return ret; | |
329 | ||
330 | if (capacity == 100) | |
331 | *status = POWER_SUPPLY_STATUS_FULL; | |
332 | else if (current_uA == 0) | |
333 | *status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
334 | else if (current_uA < 0) | |
335 | *status = POWER_SUPPLY_STATUS_DISCHARGING; | |
336 | else | |
337 | *status = POWER_SUPPLY_STATUS_CHARGING; | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | static int ds2780_get_charge_now(struct ds2780_device_info *dev_info, | |
343 | int *charge_now) | |
344 | { | |
345 | int ret; | |
346 | u16 charge_raw; | |
347 | ||
348 | /* | |
349 | * The RAAC value is located in 16 bits across the RAAC MSB and | |
350 | * LSB registers | |
351 | * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC | |
352 | * MSB register | |
353 | * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC | |
354 | * LSB register | |
355 | */ | |
853eee72 | 356 | ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG); |
275ac746 CB |
357 | if (ret < 0) |
358 | return ret; | |
359 | ||
360 | *charge_now = charge_raw * 1600; | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static int ds2780_get_control_register(struct ds2780_device_info *dev_info, | |
365 | u8 *control_reg) | |
366 | { | |
853eee72 | 367 | return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG); |
275ac746 CB |
368 | } |
369 | ||
370 | static int ds2780_set_control_register(struct ds2780_device_info *dev_info, | |
371 | u8 control_reg) | |
372 | { | |
373 | int ret; | |
374 | ||
853eee72 | 375 | ret = ds2780_write(dev_info, &control_reg, |
275ac746 CB |
376 | DS2780_CONTROL_REG, sizeof(u8)); |
377 | if (ret < 0) | |
378 | return ret; | |
379 | ||
380 | return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG); | |
381 | } | |
382 | ||
383 | static int ds2780_battery_get_property(struct power_supply *psy, | |
384 | enum power_supply_property psp, | |
385 | union power_supply_propval *val) | |
386 | { | |
387 | int ret = 0; | |
388 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
389 | ||
390 | switch (psp) { | |
391 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
392 | ret = ds2780_get_voltage(dev_info, &val->intval); | |
393 | break; | |
394 | ||
395 | case POWER_SUPPLY_PROP_TEMP: | |
396 | ret = ds2780_get_temperature(dev_info, &val->intval); | |
397 | break; | |
398 | ||
399 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
400 | val->strval = model; | |
401 | break; | |
402 | ||
403 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
404 | val->strval = manufacturer; | |
405 | break; | |
406 | ||
407 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
408 | ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval); | |
409 | break; | |
410 | ||
411 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
412 | ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval); | |
413 | break; | |
414 | ||
415 | case POWER_SUPPLY_PROP_STATUS: | |
416 | ret = ds2780_get_status(dev_info, &val->intval); | |
417 | break; | |
418 | ||
419 | case POWER_SUPPLY_PROP_CAPACITY: | |
420 | ret = ds2780_get_capacity(dev_info, &val->intval); | |
421 | break; | |
422 | ||
423 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: | |
424 | ret = ds2780_get_accumulated_current(dev_info, &val->intval); | |
425 | break; | |
426 | ||
427 | case POWER_SUPPLY_PROP_CHARGE_NOW: | |
428 | ret = ds2780_get_charge_now(dev_info, &val->intval); | |
429 | break; | |
430 | ||
431 | default: | |
432 | ret = -EINVAL; | |
433 | } | |
434 | ||
435 | return ret; | |
436 | } | |
437 | ||
438 | static enum power_supply_property ds2780_battery_props[] = { | |
439 | POWER_SUPPLY_PROP_STATUS, | |
440 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
441 | POWER_SUPPLY_PROP_TEMP, | |
442 | POWER_SUPPLY_PROP_MODEL_NAME, | |
443 | POWER_SUPPLY_PROP_MANUFACTURER, | |
444 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
445 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
446 | POWER_SUPPLY_PROP_CAPACITY, | |
447 | POWER_SUPPLY_PROP_CHARGE_COUNTER, | |
448 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
449 | }; | |
450 | ||
451 | static ssize_t ds2780_get_pmod_enabled(struct device *dev, | |
452 | struct device_attribute *attr, | |
453 | char *buf) | |
454 | { | |
455 | int ret; | |
456 | u8 control_reg; | |
457 | struct power_supply *psy = to_power_supply(dev); | |
458 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
459 | ||
460 | /* Get power mode */ | |
461 | ret = ds2780_get_control_register(dev_info, &control_reg); | |
462 | if (ret < 0) | |
463 | return ret; | |
464 | ||
465 | return sprintf(buf, "%d\n", | |
466 | !!(control_reg & DS2780_CONTROL_REG_PMOD)); | |
467 | } | |
468 | ||
469 | static ssize_t ds2780_set_pmod_enabled(struct device *dev, | |
470 | struct device_attribute *attr, | |
471 | const char *buf, | |
472 | size_t count) | |
473 | { | |
474 | int ret; | |
475 | u8 control_reg, new_setting; | |
476 | struct power_supply *psy = to_power_supply(dev); | |
477 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
478 | ||
479 | /* Set power mode */ | |
480 | ret = ds2780_get_control_register(dev_info, &control_reg); | |
481 | if (ret < 0) | |
482 | return ret; | |
483 | ||
484 | ret = kstrtou8(buf, 0, &new_setting); | |
485 | if (ret < 0) | |
486 | return ret; | |
487 | ||
488 | if ((new_setting != 0) && (new_setting != 1)) { | |
489 | dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n"); | |
490 | return -EINVAL; | |
491 | } | |
492 | ||
493 | if (new_setting) | |
494 | control_reg |= DS2780_CONTROL_REG_PMOD; | |
495 | else | |
496 | control_reg &= ~DS2780_CONTROL_REG_PMOD; | |
497 | ||
498 | ret = ds2780_set_control_register(dev_info, control_reg); | |
499 | if (ret < 0) | |
500 | return ret; | |
501 | ||
502 | return count; | |
503 | } | |
504 | ||
505 | static ssize_t ds2780_get_sense_resistor_value(struct device *dev, | |
506 | struct device_attribute *attr, | |
507 | char *buf) | |
508 | { | |
509 | int ret; | |
510 | u8 sense_resistor; | |
511 | struct power_supply *psy = to_power_supply(dev); | |
512 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
513 | ||
853eee72 | 514 | ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG); |
275ac746 CB |
515 | if (ret < 0) |
516 | return ret; | |
517 | ||
518 | ret = sprintf(buf, "%d\n", sense_resistor); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | static ssize_t ds2780_set_sense_resistor_value(struct device *dev, | |
523 | struct device_attribute *attr, | |
524 | const char *buf, | |
525 | size_t count) | |
526 | { | |
527 | int ret; | |
528 | u8 new_setting; | |
529 | struct power_supply *psy = to_power_supply(dev); | |
530 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
531 | ||
532 | ret = kstrtou8(buf, 0, &new_setting); | |
533 | if (ret < 0) | |
534 | return ret; | |
535 | ||
536 | ret = ds2780_set_sense_register(dev_info, new_setting); | |
537 | if (ret < 0) | |
538 | return ret; | |
539 | ||
540 | return count; | |
541 | } | |
542 | ||
543 | static ssize_t ds2780_get_rsgain_setting(struct device *dev, | |
544 | struct device_attribute *attr, | |
545 | char *buf) | |
546 | { | |
547 | int ret; | |
548 | u16 rsgain; | |
549 | struct power_supply *psy = to_power_supply(dev); | |
550 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
551 | ||
552 | ret = ds2780_get_rsgain_register(dev_info, &rsgain); | |
553 | if (ret < 0) | |
554 | return ret; | |
555 | ||
556 | return sprintf(buf, "%d\n", rsgain); | |
557 | } | |
558 | ||
559 | static ssize_t ds2780_set_rsgain_setting(struct device *dev, | |
560 | struct device_attribute *attr, | |
561 | const char *buf, | |
562 | size_t count) | |
563 | { | |
564 | int ret; | |
565 | u16 new_setting; | |
566 | struct power_supply *psy = to_power_supply(dev); | |
567 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
568 | ||
569 | ret = kstrtou16(buf, 0, &new_setting); | |
570 | if (ret < 0) | |
571 | return ret; | |
572 | ||
573 | /* Gain can only be from 0 to 1.999 in steps of .001 */ | |
574 | if (new_setting > 1999) { | |
575 | dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n"); | |
576 | return -EINVAL; | |
577 | } | |
578 | ||
579 | ret = ds2780_set_rsgain_register(dev_info, new_setting); | |
580 | if (ret < 0) | |
581 | return ret; | |
582 | ||
583 | return count; | |
584 | } | |
585 | ||
586 | static ssize_t ds2780_get_pio_pin(struct device *dev, | |
587 | struct device_attribute *attr, | |
588 | char *buf) | |
589 | { | |
590 | int ret; | |
591 | u8 sfr; | |
592 | struct power_supply *psy = to_power_supply(dev); | |
593 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
594 | ||
853eee72 | 595 | ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG); |
275ac746 CB |
596 | if (ret < 0) |
597 | return ret; | |
598 | ||
599 | ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC); | |
600 | return ret; | |
601 | } | |
602 | ||
603 | static ssize_t ds2780_set_pio_pin(struct device *dev, | |
604 | struct device_attribute *attr, | |
605 | const char *buf, | |
606 | size_t count) | |
607 | { | |
608 | int ret; | |
609 | u8 new_setting; | |
610 | struct power_supply *psy = to_power_supply(dev); | |
611 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
612 | ||
613 | ret = kstrtou8(buf, 0, &new_setting); | |
614 | if (ret < 0) | |
615 | return ret; | |
616 | ||
617 | if ((new_setting != 0) && (new_setting != 1)) { | |
618 | dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n"); | |
619 | return -EINVAL; | |
620 | } | |
621 | ||
853eee72 | 622 | ret = ds2780_write(dev_info, &new_setting, |
275ac746 CB |
623 | DS2780_SFR_REG, sizeof(u8)); |
624 | if (ret < 0) | |
625 | return ret; | |
626 | ||
627 | return count; | |
628 | } | |
629 | ||
630 | static ssize_t ds2780_read_param_eeprom_bin(struct file *filp, | |
631 | struct kobject *kobj, | |
632 | struct bin_attribute *bin_attr, | |
633 | char *buf, loff_t off, size_t count) | |
634 | { | |
635 | struct device *dev = container_of(kobj, struct device, kobj); | |
636 | struct power_supply *psy = to_power_supply(dev); | |
637 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
638 | ||
639 | count = min_t(loff_t, count, | |
640 | DS2780_EEPROM_BLOCK1_END - | |
641 | DS2780_EEPROM_BLOCK1_START + 1 - off); | |
642 | ||
853eee72 | 643 | return ds2780_read_block(dev_info, buf, |
275ac746 CB |
644 | DS2780_EEPROM_BLOCK1_START + off, count); |
645 | } | |
646 | ||
647 | static ssize_t ds2780_write_param_eeprom_bin(struct file *filp, | |
648 | struct kobject *kobj, | |
649 | struct bin_attribute *bin_attr, | |
650 | char *buf, loff_t off, size_t count) | |
651 | { | |
652 | struct device *dev = container_of(kobj, struct device, kobj); | |
653 | struct power_supply *psy = to_power_supply(dev); | |
654 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
655 | int ret; | |
656 | ||
657 | count = min_t(loff_t, count, | |
658 | DS2780_EEPROM_BLOCK1_END - | |
659 | DS2780_EEPROM_BLOCK1_START + 1 - off); | |
660 | ||
853eee72 | 661 | ret = ds2780_write(dev_info, buf, |
275ac746 CB |
662 | DS2780_EEPROM_BLOCK1_START + off, count); |
663 | if (ret < 0) | |
664 | return ret; | |
665 | ||
666 | ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START); | |
667 | if (ret < 0) | |
668 | return ret; | |
669 | ||
670 | return count; | |
671 | } | |
672 | ||
673 | static struct bin_attribute ds2780_param_eeprom_bin_attr = { | |
674 | .attr = { | |
675 | .name = "param_eeprom", | |
676 | .mode = S_IRUGO | S_IWUSR, | |
677 | }, | |
678 | .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1, | |
679 | .read = ds2780_read_param_eeprom_bin, | |
680 | .write = ds2780_write_param_eeprom_bin, | |
681 | }; | |
682 | ||
683 | static ssize_t ds2780_read_user_eeprom_bin(struct file *filp, | |
684 | struct kobject *kobj, | |
685 | struct bin_attribute *bin_attr, | |
686 | char *buf, loff_t off, size_t count) | |
687 | { | |
688 | struct device *dev = container_of(kobj, struct device, kobj); | |
689 | struct power_supply *psy = to_power_supply(dev); | |
690 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
691 | ||
692 | count = min_t(loff_t, count, | |
693 | DS2780_EEPROM_BLOCK0_END - | |
694 | DS2780_EEPROM_BLOCK0_START + 1 - off); | |
695 | ||
853eee72 | 696 | return ds2780_read_block(dev_info, buf, |
275ac746 | 697 | DS2780_EEPROM_BLOCK0_START + off, count); |
275ac746 CB |
698 | } |
699 | ||
700 | static ssize_t ds2780_write_user_eeprom_bin(struct file *filp, | |
701 | struct kobject *kobj, | |
702 | struct bin_attribute *bin_attr, | |
703 | char *buf, loff_t off, size_t count) | |
704 | { | |
705 | struct device *dev = container_of(kobj, struct device, kobj); | |
706 | struct power_supply *psy = to_power_supply(dev); | |
707 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); | |
708 | int ret; | |
709 | ||
710 | count = min_t(loff_t, count, | |
711 | DS2780_EEPROM_BLOCK0_END - | |
712 | DS2780_EEPROM_BLOCK0_START + 1 - off); | |
713 | ||
853eee72 | 714 | ret = ds2780_write(dev_info, buf, |
275ac746 CB |
715 | DS2780_EEPROM_BLOCK0_START + off, count); |
716 | if (ret < 0) | |
717 | return ret; | |
718 | ||
719 | ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START); | |
720 | if (ret < 0) | |
721 | return ret; | |
722 | ||
723 | return count; | |
724 | } | |
725 | ||
726 | static struct bin_attribute ds2780_user_eeprom_bin_attr = { | |
727 | .attr = { | |
728 | .name = "user_eeprom", | |
729 | .mode = S_IRUGO | S_IWUSR, | |
730 | }, | |
731 | .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1, | |
732 | .read = ds2780_read_user_eeprom_bin, | |
733 | .write = ds2780_write_user_eeprom_bin, | |
734 | }; | |
735 | ||
736 | static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled, | |
737 | ds2780_set_pmod_enabled); | |
738 | static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, | |
739 | ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value); | |
740 | static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting, | |
741 | ds2780_set_rsgain_setting); | |
742 | static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin, | |
743 | ds2780_set_pio_pin); | |
744 | ||
745 | ||
746 | static struct attribute *ds2780_attributes[] = { | |
747 | &dev_attr_pmod_enabled.attr, | |
748 | &dev_attr_sense_resistor_value.attr, | |
749 | &dev_attr_rsgain_setting.attr, | |
750 | &dev_attr_pio_pin.attr, | |
751 | NULL | |
752 | }; | |
753 | ||
754 | static const struct attribute_group ds2780_attr_group = { | |
755 | .attrs = ds2780_attributes, | |
756 | }; | |
757 | ||
c8afa640 | 758 | static int ds2780_battery_probe(struct platform_device *pdev) |
275ac746 CB |
759 | { |
760 | int ret = 0; | |
761 | struct ds2780_device_info *dev_info; | |
762 | ||
2cb12122 | 763 | dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL); |
275ac746 CB |
764 | if (!dev_info) { |
765 | ret = -ENOMEM; | |
766 | goto fail; | |
767 | } | |
768 | ||
769 | platform_set_drvdata(pdev, dev_info); | |
770 | ||
771 | dev_info->dev = &pdev->dev; | |
772 | dev_info->w1_dev = pdev->dev.parent; | |
773 | dev_info->bat.name = dev_name(&pdev->dev); | |
774 | dev_info->bat.type = POWER_SUPPLY_TYPE_BATTERY; | |
775 | dev_info->bat.properties = ds2780_battery_props; | |
776 | dev_info->bat.num_properties = ARRAY_SIZE(ds2780_battery_props); | |
777 | dev_info->bat.get_property = ds2780_battery_get_property; | |
778 | ||
779 | ret = power_supply_register(&pdev->dev, &dev_info->bat); | |
780 | if (ret) { | |
781 | dev_err(dev_info->dev, "failed to register battery\n"); | |
2cb12122 | 782 | goto fail; |
275ac746 CB |
783 | } |
784 | ||
785 | ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); | |
786 | if (ret) { | |
787 | dev_err(dev_info->dev, "failed to create sysfs group\n"); | |
788 | goto fail_unregister; | |
789 | } | |
790 | ||
791 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, | |
792 | &ds2780_param_eeprom_bin_attr); | |
793 | if (ret) { | |
794 | dev_err(dev_info->dev, | |
795 | "failed to create param eeprom bin file"); | |
796 | goto fail_remove_group; | |
797 | } | |
798 | ||
799 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, | |
800 | &ds2780_user_eeprom_bin_attr); | |
801 | if (ret) { | |
802 | dev_err(dev_info->dev, | |
803 | "failed to create user eeprom bin file"); | |
804 | goto fail_remove_bin_file; | |
805 | } | |
806 | ||
807 | return 0; | |
808 | ||
809 | fail_remove_bin_file: | |
810 | sysfs_remove_bin_file(&dev_info->bat.dev->kobj, | |
811 | &ds2780_param_eeprom_bin_attr); | |
812 | fail_remove_group: | |
813 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); | |
814 | fail_unregister: | |
815 | power_supply_unregister(&dev_info->bat); | |
275ac746 CB |
816 | fail: |
817 | return ret; | |
818 | } | |
819 | ||
415ec69f | 820 | static int ds2780_battery_remove(struct platform_device *pdev) |
275ac746 CB |
821 | { |
822 | struct ds2780_device_info *dev_info = platform_get_drvdata(pdev); | |
823 | ||
824 | /* remove attributes */ | |
825 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); | |
826 | ||
827 | power_supply_unregister(&dev_info->bat); | |
828 | ||
275ac746 CB |
829 | return 0; |
830 | } | |
831 | ||
275ac746 CB |
832 | static struct platform_driver ds2780_battery_driver = { |
833 | .driver = { | |
834 | .name = "ds2780-battery", | |
835 | }, | |
836 | .probe = ds2780_battery_probe, | |
28ea73f4 | 837 | .remove = ds2780_battery_remove, |
275ac746 CB |
838 | }; |
839 | ||
300bac7f | 840 | module_platform_driver(ds2780_battery_driver); |
275ac746 CB |
841 | |
842 | MODULE_LICENSE("GPL"); | |
843 | MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); | |
844 | MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver"); | |
300bac7f | 845 | MODULE_ALIAS("platform:ds2780-battery"); |