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fef37e9a RS |
1 | /* |
2 | * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC | |
3 | * | |
4 | * Author: Renata Sayakhova <renata@oktetlabs.ru> | |
5 | * | |
6 | * Based on ds2780_battery drivers | |
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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/param.h> | |
17 | #include <linux/pm.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/power_supply.h> | |
20 | #include <linux/idr.h> | |
21 | ||
22 | #include "../w1/w1.h" | |
23 | #include "../w1/slaves/w1_ds2781.h" | |
24 | ||
25 | /* Current unit measurement in uA for a 1 milli-ohm sense resistor */ | |
26 | #define DS2781_CURRENT_UNITS 1563 | |
27 | /* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */ | |
28 | #define DS2781_CHARGE_UNITS 6250 | |
29 | /* Number of bytes in user EEPROM space */ | |
30 | #define DS2781_USER_EEPROM_SIZE (DS2781_EEPROM_BLOCK0_END - \ | |
31 | DS2781_EEPROM_BLOCK0_START + 1) | |
32 | /* Number of bytes in parameter EEPROM space */ | |
33 | #define DS2781_PARAM_EEPROM_SIZE (DS2781_EEPROM_BLOCK1_END - \ | |
34 | DS2781_EEPROM_BLOCK1_START + 1) | |
35 | ||
36 | struct ds2781_device_info { | |
37 | struct device *dev; | |
297d716f KK |
38 | struct power_supply *bat; |
39 | struct power_supply_desc bat_desc; | |
fef37e9a | 40 | struct device *w1_dev; |
fef37e9a RS |
41 | }; |
42 | ||
43 | enum current_types { | |
44 | CURRENT_NOW, | |
45 | CURRENT_AVG, | |
46 | }; | |
47 | ||
48 | static const char model[] = "DS2781"; | |
49 | static const char manufacturer[] = "Maxim/Dallas"; | |
50 | ||
51 | static inline struct ds2781_device_info * | |
52 | to_ds2781_device_info(struct power_supply *psy) | |
53 | { | |
297d716f | 54 | return power_supply_get_drvdata(psy); |
fef37e9a RS |
55 | } |
56 | ||
57 | static inline struct power_supply *to_power_supply(struct device *dev) | |
58 | { | |
59 | return dev_get_drvdata(dev); | |
60 | } | |
61 | ||
62 | static inline int ds2781_battery_io(struct ds2781_device_info *dev_info, | |
63 | char *buf, int addr, size_t count, int io) | |
64 | { | |
b02f8bed | 65 | return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io); |
fef37e9a RS |
66 | } |
67 | ||
7dbae556 | 68 | static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf, |
fef37e9a RS |
69 | int addr, size_t count) |
70 | { | |
71 | return ds2781_battery_io(dev_info, buf, addr, count, 0); | |
72 | } | |
73 | ||
74 | static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val, | |
75 | int addr) | |
76 | { | |
77 | return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0); | |
78 | } | |
79 | ||
80 | static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val, | |
81 | int addr) | |
82 | { | |
83 | int ret; | |
84 | u8 raw[2]; | |
85 | ||
86 | ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0); | |
87 | if (ret < 0) | |
88 | return ret; | |
89 | ||
90 | *val = (raw[0] << 8) | raw[1]; | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static inline int ds2781_read_block(struct ds2781_device_info *dev_info, | |
96 | u8 *val, int addr, size_t count) | |
97 | { | |
98 | return ds2781_battery_io(dev_info, val, addr, count, 0); | |
99 | } | |
100 | ||
101 | static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val, | |
102 | int addr, size_t count) | |
103 | { | |
104 | return ds2781_battery_io(dev_info, val, addr, count, 1); | |
105 | } | |
106 | ||
107 | static inline int ds2781_store_eeprom(struct device *dev, int addr) | |
108 | { | |
109 | return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA); | |
110 | } | |
111 | ||
112 | static inline int ds2781_recall_eeprom(struct device *dev, int addr) | |
113 | { | |
114 | return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA); | |
115 | } | |
116 | ||
117 | static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg) | |
118 | { | |
119 | int ret; | |
120 | ||
121 | ret = ds2781_store_eeprom(dev_info->w1_dev, reg); | |
122 | if (ret < 0) | |
123 | return ret; | |
124 | ||
125 | ret = ds2781_recall_eeprom(dev_info->w1_dev, reg); | |
126 | if (ret < 0) | |
127 | return ret; | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | /* Set sense resistor value in mhos */ | |
133 | static int ds2781_set_sense_register(struct ds2781_device_info *dev_info, | |
134 | u8 conductance) | |
135 | { | |
136 | int ret; | |
137 | ||
138 | ret = ds2781_write(dev_info, &conductance, | |
139 | DS2781_RSNSP, sizeof(u8)); | |
140 | if (ret < 0) | |
141 | return ret; | |
142 | ||
143 | return ds2781_save_eeprom(dev_info, DS2781_RSNSP); | |
144 | } | |
145 | ||
146 | /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
147 | static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info, | |
148 | u16 *rsgain) | |
149 | { | |
150 | return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB); | |
151 | } | |
152 | ||
153 | /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
154 | static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info, | |
155 | u16 rsgain) | |
156 | { | |
157 | int ret; | |
158 | u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; | |
159 | ||
160 | ret = ds2781_write(dev_info, raw, | |
161 | DS2781_RSGAIN_MSB, sizeof(raw)); | |
162 | if (ret < 0) | |
163 | return ret; | |
164 | ||
165 | return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB); | |
166 | } | |
167 | ||
168 | static int ds2781_get_voltage(struct ds2781_device_info *dev_info, | |
169 | int *voltage_uV) | |
170 | { | |
171 | int ret; | |
172 | char val[2]; | |
173 | int voltage_raw; | |
174 | ||
175 | ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8)); | |
176 | if (ret < 0) | |
177 | return ret; | |
178 | /* | |
179 | * The voltage value is located in 10 bits across the voltage MSB | |
180 | * and LSB registers in two's compliment form | |
181 | * Sign bit of the voltage value is in bit 7 of the voltage MSB register | |
182 | * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the | |
183 | * voltage MSB register | |
184 | * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the | |
185 | * voltage LSB register | |
186 | */ | |
187 | voltage_raw = (val[0] << 3) | | |
188 | (val[1] >> 5); | |
189 | ||
190 | /* DS2781 reports voltage in units of 9.76mV, but the battery class | |
191 | * reports in units of uV, so convert by multiplying by 9760. */ | |
192 | *voltage_uV = voltage_raw * 9760; | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static int ds2781_get_temperature(struct ds2781_device_info *dev_info, | |
198 | int *temp) | |
199 | { | |
200 | int ret; | |
201 | char val[2]; | |
202 | int temp_raw; | |
203 | ||
204 | ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8)); | |
205 | if (ret < 0) | |
206 | return ret; | |
207 | /* | |
208 | * The temperature value is located in 10 bits across the temperature | |
209 | * MSB and LSB registers in two's compliment form | |
210 | * Sign bit of the temperature value is in bit 7 of the temperature | |
211 | * MSB register | |
212 | * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the | |
213 | * temperature MSB register | |
214 | * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the | |
215 | * temperature LSB register | |
216 | */ | |
217 | temp_raw = ((val[0]) << 3) | | |
218 | (val[1] >> 5); | |
219 | *temp = temp_raw + (temp_raw / 4); | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
224 | static int ds2781_get_current(struct ds2781_device_info *dev_info, | |
225 | enum current_types type, int *current_uA) | |
226 | { | |
227 | int ret, sense_res; | |
228 | s16 current_raw; | |
229 | u8 sense_res_raw, reg_msb; | |
230 | ||
231 | /* | |
232 | * The units of measurement for current are dependent on the value of | |
233 | * the sense resistor. | |
234 | */ | |
235 | ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); | |
236 | if (ret < 0) | |
237 | return ret; | |
238 | ||
239 | if (sense_res_raw == 0) { | |
240 | dev_err(dev_info->dev, "sense resistor value is 0\n"); | |
241 | return -EINVAL; | |
242 | } | |
243 | sense_res = 1000 / sense_res_raw; | |
244 | ||
245 | if (type == CURRENT_NOW) | |
246 | reg_msb = DS2781_CURRENT_MSB; | |
247 | else if (type == CURRENT_AVG) | |
248 | reg_msb = DS2781_IAVG_MSB; | |
249 | else | |
250 | return -EINVAL; | |
251 | ||
252 | /* | |
253 | * The current value is located in 16 bits across the current MSB | |
254 | * and LSB registers in two's compliment form | |
255 | * Sign bit of the current value is in bit 7 of the current MSB register | |
256 | * Bits 14 - 8 of the current value are in bits 6 - 0 of the current | |
257 | * MSB register | |
258 | * Bits 7 - 0 of the current value are in bits 7 - 0 of the current | |
259 | * LSB register | |
260 | */ | |
261 | ret = ds2781_read16(dev_info, ¤t_raw, reg_msb); | |
262 | if (ret < 0) | |
263 | return ret; | |
264 | ||
265 | *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info, | |
270 | int *accumulated_current) | |
271 | { | |
272 | int ret, sense_res; | |
273 | s16 current_raw; | |
274 | u8 sense_res_raw; | |
275 | ||
276 | /* | |
277 | * The units of measurement for accumulated current are dependent on | |
278 | * the value of the sense resistor. | |
279 | */ | |
280 | ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); | |
281 | if (ret < 0) | |
282 | return ret; | |
283 | ||
284 | if (sense_res_raw == 0) { | |
285 | dev_err(dev_info->dev, "sense resistor value is 0\n"); | |
286 | return -EINVAL; | |
287 | } | |
288 | sense_res = 1000 / sense_res_raw; | |
289 | ||
290 | /* | |
291 | * The ACR value is located in 16 bits across the ACR MSB and | |
292 | * LSB registers | |
293 | * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR | |
294 | * MSB register | |
295 | * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR | |
296 | * LSB register | |
297 | */ | |
298 | ret = ds2781_read16(dev_info, ¤t_raw, DS2781_ACR_MSB); | |
299 | if (ret < 0) | |
300 | return ret; | |
301 | ||
302 | *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static int ds2781_get_capacity(struct ds2781_device_info *dev_info, | |
307 | int *capacity) | |
308 | { | |
309 | int ret; | |
310 | u8 raw; | |
311 | ||
312 | ret = ds2781_read8(dev_info, &raw, DS2781_RARC); | |
313 | if (ret < 0) | |
314 | return ret; | |
315 | ||
316 | *capacity = raw; | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status) | |
321 | { | |
322 | int ret, current_uA, capacity; | |
323 | ||
324 | ret = ds2781_get_current(dev_info, CURRENT_NOW, ¤t_uA); | |
325 | if (ret < 0) | |
326 | return ret; | |
327 | ||
328 | ret = ds2781_get_capacity(dev_info, &capacity); | |
329 | if (ret < 0) | |
330 | return ret; | |
331 | ||
297d716f | 332 | if (power_supply_am_i_supplied(dev_info->bat)) { |
fef37e9a RS |
333 | if (capacity == 100) |
334 | *status = POWER_SUPPLY_STATUS_FULL; | |
335 | else if (current_uA > 50000) | |
336 | *status = POWER_SUPPLY_STATUS_CHARGING; | |
337 | else | |
338 | *status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
339 | } else { | |
340 | *status = POWER_SUPPLY_STATUS_DISCHARGING; | |
341 | } | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int ds2781_get_charge_now(struct ds2781_device_info *dev_info, | |
346 | int *charge_now) | |
347 | { | |
348 | int ret; | |
349 | u16 charge_raw; | |
350 | ||
351 | /* | |
352 | * The RAAC value is located in 16 bits across the RAAC MSB and | |
353 | * LSB registers | |
354 | * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC | |
355 | * MSB register | |
356 | * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC | |
357 | * LSB register | |
358 | */ | |
359 | ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB); | |
360 | if (ret < 0) | |
361 | return ret; | |
362 | ||
363 | *charge_now = charge_raw * 1600; | |
364 | return 0; | |
365 | } | |
366 | ||
367 | static int ds2781_get_control_register(struct ds2781_device_info *dev_info, | |
368 | u8 *control_reg) | |
369 | { | |
370 | return ds2781_read8(dev_info, control_reg, DS2781_CONTROL); | |
371 | } | |
372 | ||
373 | static int ds2781_set_control_register(struct ds2781_device_info *dev_info, | |
374 | u8 control_reg) | |
375 | { | |
376 | int ret; | |
377 | ||
378 | ret = ds2781_write(dev_info, &control_reg, | |
379 | DS2781_CONTROL, sizeof(u8)); | |
380 | if (ret < 0) | |
381 | return ret; | |
382 | ||
383 | return ds2781_save_eeprom(dev_info, DS2781_CONTROL); | |
384 | } | |
385 | ||
386 | static int ds2781_battery_get_property(struct power_supply *psy, | |
387 | enum power_supply_property psp, | |
388 | union power_supply_propval *val) | |
389 | { | |
390 | int ret = 0; | |
391 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
392 | ||
393 | switch (psp) { | |
394 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
395 | ret = ds2781_get_voltage(dev_info, &val->intval); | |
396 | break; | |
397 | ||
398 | case POWER_SUPPLY_PROP_TEMP: | |
399 | ret = ds2781_get_temperature(dev_info, &val->intval); | |
400 | break; | |
401 | ||
402 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
403 | val->strval = model; | |
404 | break; | |
405 | ||
406 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
407 | val->strval = manufacturer; | |
408 | break; | |
409 | ||
410 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
411 | ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval); | |
412 | break; | |
413 | ||
414 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
415 | ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval); | |
416 | break; | |
417 | ||
418 | case POWER_SUPPLY_PROP_STATUS: | |
419 | ret = ds2781_get_status(dev_info, &val->intval); | |
420 | break; | |
421 | ||
422 | case POWER_SUPPLY_PROP_CAPACITY: | |
423 | ret = ds2781_get_capacity(dev_info, &val->intval); | |
424 | break; | |
425 | ||
426 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: | |
427 | ret = ds2781_get_accumulated_current(dev_info, &val->intval); | |
428 | break; | |
429 | ||
430 | case POWER_SUPPLY_PROP_CHARGE_NOW: | |
431 | ret = ds2781_get_charge_now(dev_info, &val->intval); | |
432 | break; | |
433 | ||
434 | default: | |
435 | ret = -EINVAL; | |
436 | } | |
437 | ||
438 | return ret; | |
439 | } | |
440 | ||
441 | static enum power_supply_property ds2781_battery_props[] = { | |
442 | POWER_SUPPLY_PROP_STATUS, | |
443 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
444 | POWER_SUPPLY_PROP_TEMP, | |
445 | POWER_SUPPLY_PROP_MODEL_NAME, | |
446 | POWER_SUPPLY_PROP_MANUFACTURER, | |
447 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
448 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
449 | POWER_SUPPLY_PROP_CAPACITY, | |
450 | POWER_SUPPLY_PROP_CHARGE_COUNTER, | |
451 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
452 | }; | |
453 | ||
454 | static ssize_t ds2781_get_pmod_enabled(struct device *dev, | |
455 | struct device_attribute *attr, | |
456 | char *buf) | |
457 | { | |
458 | int ret; | |
459 | u8 control_reg; | |
460 | struct power_supply *psy = to_power_supply(dev); | |
461 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
462 | ||
463 | /* Get power mode */ | |
464 | ret = ds2781_get_control_register(dev_info, &control_reg); | |
465 | if (ret < 0) | |
466 | return ret; | |
467 | ||
468 | return sprintf(buf, "%d\n", | |
469 | !!(control_reg & DS2781_CONTROL_PMOD)); | |
470 | } | |
471 | ||
472 | static ssize_t ds2781_set_pmod_enabled(struct device *dev, | |
473 | struct device_attribute *attr, | |
474 | const char *buf, | |
475 | size_t count) | |
476 | { | |
477 | int ret; | |
478 | u8 control_reg, new_setting; | |
479 | struct power_supply *psy = to_power_supply(dev); | |
480 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
481 | ||
482 | /* Set power mode */ | |
483 | ret = ds2781_get_control_register(dev_info, &control_reg); | |
484 | if (ret < 0) | |
485 | return ret; | |
486 | ||
487 | ret = kstrtou8(buf, 0, &new_setting); | |
488 | if (ret < 0) | |
489 | return ret; | |
490 | ||
491 | if ((new_setting != 0) && (new_setting != 1)) { | |
492 | dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n"); | |
493 | return -EINVAL; | |
494 | } | |
495 | ||
496 | if (new_setting) | |
497 | control_reg |= DS2781_CONTROL_PMOD; | |
498 | else | |
499 | control_reg &= ~DS2781_CONTROL_PMOD; | |
500 | ||
501 | ret = ds2781_set_control_register(dev_info, control_reg); | |
502 | if (ret < 0) | |
503 | return ret; | |
504 | ||
505 | return count; | |
506 | } | |
507 | ||
508 | static ssize_t ds2781_get_sense_resistor_value(struct device *dev, | |
509 | struct device_attribute *attr, | |
510 | char *buf) | |
511 | { | |
512 | int ret; | |
513 | u8 sense_resistor; | |
514 | struct power_supply *psy = to_power_supply(dev); | |
515 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
516 | ||
517 | ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP); | |
518 | if (ret < 0) | |
519 | return ret; | |
520 | ||
521 | ret = sprintf(buf, "%d\n", sense_resistor); | |
522 | return ret; | |
523 | } | |
524 | ||
525 | static ssize_t ds2781_set_sense_resistor_value(struct device *dev, | |
526 | struct device_attribute *attr, | |
527 | const char *buf, | |
528 | size_t count) | |
529 | { | |
530 | int ret; | |
531 | u8 new_setting; | |
532 | struct power_supply *psy = to_power_supply(dev); | |
533 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
534 | ||
535 | ret = kstrtou8(buf, 0, &new_setting); | |
536 | if (ret < 0) | |
537 | return ret; | |
538 | ||
539 | ret = ds2781_set_sense_register(dev_info, new_setting); | |
540 | if (ret < 0) | |
541 | return ret; | |
542 | ||
543 | return count; | |
544 | } | |
545 | ||
546 | static ssize_t ds2781_get_rsgain_setting(struct device *dev, | |
547 | struct device_attribute *attr, | |
548 | char *buf) | |
549 | { | |
550 | int ret; | |
551 | u16 rsgain; | |
552 | struct power_supply *psy = to_power_supply(dev); | |
553 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
554 | ||
555 | ret = ds2781_get_rsgain_register(dev_info, &rsgain); | |
556 | if (ret < 0) | |
557 | return ret; | |
558 | ||
559 | return sprintf(buf, "%d\n", rsgain); | |
560 | } | |
561 | ||
562 | static ssize_t ds2781_set_rsgain_setting(struct device *dev, | |
563 | struct device_attribute *attr, | |
564 | const char *buf, | |
565 | size_t count) | |
566 | { | |
567 | int ret; | |
568 | u16 new_setting; | |
569 | struct power_supply *psy = to_power_supply(dev); | |
570 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
571 | ||
572 | ret = kstrtou16(buf, 0, &new_setting); | |
573 | if (ret < 0) | |
574 | return ret; | |
575 | ||
576 | /* Gain can only be from 0 to 1.999 in steps of .001 */ | |
577 | if (new_setting > 1999) { | |
578 | dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n"); | |
579 | return -EINVAL; | |
580 | } | |
581 | ||
582 | ret = ds2781_set_rsgain_register(dev_info, new_setting); | |
583 | if (ret < 0) | |
584 | return ret; | |
585 | ||
586 | return count; | |
587 | } | |
588 | ||
589 | static ssize_t ds2781_get_pio_pin(struct device *dev, | |
590 | struct device_attribute *attr, | |
591 | char *buf) | |
592 | { | |
593 | int ret; | |
594 | u8 sfr; | |
595 | struct power_supply *psy = to_power_supply(dev); | |
596 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
597 | ||
598 | ret = ds2781_read8(dev_info, &sfr, DS2781_SFR); | |
599 | if (ret < 0) | |
600 | return ret; | |
601 | ||
602 | ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC); | |
603 | return ret; | |
604 | } | |
605 | ||
606 | static ssize_t ds2781_set_pio_pin(struct device *dev, | |
607 | struct device_attribute *attr, | |
608 | const char *buf, | |
609 | size_t count) | |
610 | { | |
611 | int ret; | |
612 | u8 new_setting; | |
613 | struct power_supply *psy = to_power_supply(dev); | |
614 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
615 | ||
616 | ret = kstrtou8(buf, 0, &new_setting); | |
617 | if (ret < 0) | |
618 | return ret; | |
619 | ||
620 | if ((new_setting != 0) && (new_setting != 1)) { | |
621 | dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n"); | |
622 | return -EINVAL; | |
623 | } | |
624 | ||
625 | ret = ds2781_write(dev_info, &new_setting, | |
626 | DS2781_SFR, sizeof(u8)); | |
627 | if (ret < 0) | |
628 | return ret; | |
629 | ||
630 | return count; | |
631 | } | |
632 | ||
633 | static ssize_t ds2781_read_param_eeprom_bin(struct file *filp, | |
634 | struct kobject *kobj, | |
635 | struct bin_attribute *bin_attr, | |
636 | char *buf, loff_t off, size_t count) | |
637 | { | |
638 | struct device *dev = container_of(kobj, struct device, kobj); | |
639 | struct power_supply *psy = to_power_supply(dev); | |
640 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
641 | ||
13f2483c | 642 | count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off); |
fef37e9a RS |
643 | |
644 | return ds2781_read_block(dev_info, buf, | |
645 | DS2781_EEPROM_BLOCK1_START + off, count); | |
646 | } | |
647 | ||
648 | static ssize_t ds2781_write_param_eeprom_bin(struct file *filp, | |
649 | struct kobject *kobj, | |
650 | struct bin_attribute *bin_attr, | |
651 | char *buf, loff_t off, size_t count) | |
652 | { | |
653 | struct device *dev = container_of(kobj, struct device, kobj); | |
654 | struct power_supply *psy = to_power_supply(dev); | |
655 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
656 | int ret; | |
657 | ||
13f2483c | 658 | count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off); |
fef37e9a RS |
659 | |
660 | ret = ds2781_write(dev_info, buf, | |
661 | DS2781_EEPROM_BLOCK1_START + off, count); | |
662 | if (ret < 0) | |
663 | return ret; | |
664 | ||
665 | ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START); | |
666 | if (ret < 0) | |
667 | return ret; | |
668 | ||
669 | return count; | |
670 | } | |
671 | ||
672 | static struct bin_attribute ds2781_param_eeprom_bin_attr = { | |
673 | .attr = { | |
674 | .name = "param_eeprom", | |
675 | .mode = S_IRUGO | S_IWUSR, | |
676 | }, | |
13f2483c | 677 | .size = DS2781_PARAM_EEPROM_SIZE, |
fef37e9a RS |
678 | .read = ds2781_read_param_eeprom_bin, |
679 | .write = ds2781_write_param_eeprom_bin, | |
680 | }; | |
681 | ||
682 | static ssize_t ds2781_read_user_eeprom_bin(struct file *filp, | |
683 | struct kobject *kobj, | |
684 | struct bin_attribute *bin_attr, | |
685 | char *buf, loff_t off, size_t count) | |
686 | { | |
687 | struct device *dev = container_of(kobj, struct device, kobj); | |
688 | struct power_supply *psy = to_power_supply(dev); | |
689 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
690 | ||
13f2483c | 691 | count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off); |
fef37e9a RS |
692 | |
693 | return ds2781_read_block(dev_info, buf, | |
694 | DS2781_EEPROM_BLOCK0_START + off, count); | |
695 | ||
696 | } | |
697 | ||
698 | static ssize_t ds2781_write_user_eeprom_bin(struct file *filp, | |
699 | struct kobject *kobj, | |
700 | struct bin_attribute *bin_attr, | |
701 | char *buf, loff_t off, size_t count) | |
702 | { | |
703 | struct device *dev = container_of(kobj, struct device, kobj); | |
704 | struct power_supply *psy = to_power_supply(dev); | |
705 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
706 | int ret; | |
707 | ||
13f2483c | 708 | count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off); |
fef37e9a RS |
709 | |
710 | ret = ds2781_write(dev_info, buf, | |
711 | DS2781_EEPROM_BLOCK0_START + off, count); | |
712 | if (ret < 0) | |
713 | return ret; | |
714 | ||
715 | ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START); | |
716 | if (ret < 0) | |
717 | return ret; | |
718 | ||
719 | return count; | |
720 | } | |
721 | ||
722 | static struct bin_attribute ds2781_user_eeprom_bin_attr = { | |
723 | .attr = { | |
724 | .name = "user_eeprom", | |
725 | .mode = S_IRUGO | S_IWUSR, | |
726 | }, | |
13f2483c | 727 | .size = DS2781_USER_EEPROM_SIZE, |
fef37e9a RS |
728 | .read = ds2781_read_user_eeprom_bin, |
729 | .write = ds2781_write_user_eeprom_bin, | |
730 | }; | |
731 | ||
732 | static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled, | |
733 | ds2781_set_pmod_enabled); | |
734 | static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, | |
735 | ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value); | |
736 | static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting, | |
737 | ds2781_set_rsgain_setting); | |
738 | static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin, | |
739 | ds2781_set_pio_pin); | |
740 | ||
741 | ||
742 | static struct attribute *ds2781_attributes[] = { | |
743 | &dev_attr_pmod_enabled.attr, | |
744 | &dev_attr_sense_resistor_value.attr, | |
745 | &dev_attr_rsgain_setting.attr, | |
746 | &dev_attr_pio_pin.attr, | |
747 | NULL | |
748 | }; | |
749 | ||
750 | static const struct attribute_group ds2781_attr_group = { | |
751 | .attrs = ds2781_attributes, | |
752 | }; | |
753 | ||
c8afa640 | 754 | static int ds2781_battery_probe(struct platform_device *pdev) |
fef37e9a | 755 | { |
297d716f | 756 | struct power_supply_config psy_cfg = {}; |
fef37e9a RS |
757 | int ret = 0; |
758 | struct ds2781_device_info *dev_info; | |
759 | ||
deacc4fe DN |
760 | dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL); |
761 | if (!dev_info) | |
762 | return -ENOMEM; | |
fef37e9a RS |
763 | |
764 | platform_set_drvdata(pdev, dev_info); | |
765 | ||
766 | dev_info->dev = &pdev->dev; | |
767 | dev_info->w1_dev = pdev->dev.parent; | |
297d716f KK |
768 | dev_info->bat_desc.name = dev_name(&pdev->dev); |
769 | dev_info->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; | |
770 | dev_info->bat_desc.properties = ds2781_battery_props; | |
771 | dev_info->bat_desc.num_properties = ARRAY_SIZE(ds2781_battery_props); | |
772 | dev_info->bat_desc.get_property = ds2781_battery_get_property; | |
fef37e9a | 773 | |
297d716f KK |
774 | psy_cfg.drv_data = dev_info; |
775 | ||
776 | dev_info->bat = power_supply_register(&pdev->dev, &dev_info->bat_desc, | |
777 | &psy_cfg); | |
778 | if (IS_ERR(dev_info->bat)) { | |
fef37e9a | 779 | dev_err(dev_info->dev, "failed to register battery\n"); |
297d716f | 780 | ret = PTR_ERR(dev_info->bat); |
deacc4fe | 781 | goto fail; |
fef37e9a RS |
782 | } |
783 | ||
297d716f | 784 | ret = sysfs_create_group(&dev_info->bat->dev.kobj, &ds2781_attr_group); |
fef37e9a RS |
785 | if (ret) { |
786 | dev_err(dev_info->dev, "failed to create sysfs group\n"); | |
787 | goto fail_unregister; | |
788 | } | |
789 | ||
297d716f | 790 | ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, |
fef37e9a RS |
791 | &ds2781_param_eeprom_bin_attr); |
792 | if (ret) { | |
793 | dev_err(dev_info->dev, | |
794 | "failed to create param eeprom bin file"); | |
795 | goto fail_remove_group; | |
796 | } | |
797 | ||
297d716f | 798 | ret = sysfs_create_bin_file(&dev_info->bat->dev.kobj, |
fef37e9a RS |
799 | &ds2781_user_eeprom_bin_attr); |
800 | if (ret) { | |
801 | dev_err(dev_info->dev, | |
802 | "failed to create user eeprom bin file"); | |
803 | goto fail_remove_bin_file; | |
804 | } | |
805 | ||
fef37e9a RS |
806 | return 0; |
807 | ||
808 | fail_remove_bin_file: | |
297d716f | 809 | sysfs_remove_bin_file(&dev_info->bat->dev.kobj, |
fef37e9a RS |
810 | &ds2781_param_eeprom_bin_attr); |
811 | fail_remove_group: | |
297d716f | 812 | sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group); |
fef37e9a | 813 | fail_unregister: |
297d716f | 814 | power_supply_unregister(dev_info->bat); |
fef37e9a RS |
815 | fail: |
816 | return ret; | |
817 | } | |
818 | ||
415ec69f | 819 | static int ds2781_battery_remove(struct platform_device *pdev) |
fef37e9a RS |
820 | { |
821 | struct ds2781_device_info *dev_info = platform_get_drvdata(pdev); | |
822 | ||
297d716f KK |
823 | /* |
824 | * Remove attributes before unregistering power supply | |
825 | * because 'bat' will be freed on power_supply_unregister() call. | |
826 | */ | |
827 | sysfs_remove_group(&dev_info->bat->dev.kobj, &ds2781_attr_group); | |
fef37e9a | 828 | |
297d716f | 829 | power_supply_unregister(dev_info->bat); |
fef37e9a | 830 | |
fef37e9a RS |
831 | return 0; |
832 | } | |
833 | ||
834 | static struct platform_driver ds2781_battery_driver = { | |
835 | .driver = { | |
836 | .name = "ds2781-battery", | |
837 | }, | |
838 | .probe = ds2781_battery_probe, | |
28ea73f4 | 839 | .remove = ds2781_battery_remove, |
fef37e9a | 840 | }; |
bc6e51d8 | 841 | module_platform_driver(ds2781_battery_driver); |
fef37e9a RS |
842 | |
843 | MODULE_LICENSE("GPL"); | |
844 | MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>"); | |
845 | MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver"); | |
846 | MODULE_ALIAS("platform:ds2781-battery"); | |
847 |