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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 | |
52 | static inline struct ds2780_device_info * |
53 | to_ds2780_device_info(struct power_supply *psy) |
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 | |
63 | static inline int ds2780_battery_io(struct ds2780_device_info *dev_info, |
64 | char *buf, int addr, size_t count, int io) |
65 | { |
66 | return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io); |
67 | } |
68 | |
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); |
73 | } |
74 | |
75 | static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val, |
76 | int addr) |
77 | { |
78 | int ret; |
79 | u8 raw[2]; |
80 | |
81 | ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0); |
82 | if (ret < 0) |
83 | return ret; |
84 | |
85 | *val = (raw[0] << 8) | raw[1]; |
86 | |
87 | return 0; |
88 | } |
89 | |
90 | static inline int ds2780_read_block(struct ds2780_device_info *dev_info, |
91 | u8 *val, int addr, size_t count) |
92 | { |
93 | return ds2780_battery_io(dev_info, val, addr, count, 0); |
94 | } |
95 | |
96 | static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val, |
97 | int addr, size_t count) |
98 | { |
99 | return ds2780_battery_io(dev_info, val, addr, count, 1); |
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 | |
133 | ret = ds2780_write(dev_info, &conductance, |
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 | { |
145 | return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG); |
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 | |
155 | ret = ds2780_write(dev_info, raw, |
156 | DS2780_RSGAIN_MSB_REG, sizeof(raw)); |
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 | */ |
178 | ret = ds2780_read16(dev_info, &voltage_raw, |
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 | */ |
207 | ret = ds2780_read16(dev_info, &temperature_raw, |
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 | */ |
233 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
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"); |
239 | return -EINVAL; |
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 | */ |
259 | ret = ds2780_read16(dev_info, ¤t_raw, reg_msb); |
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 | */ |
278 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
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 | */ |
296 | ret = ds2780_read16(dev_info, ¤t_raw, DS2780_ACR_MSB_REG); |
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 | |
310 | ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG); |
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 | */ |
356 | ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG); |
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 | { |
367 | return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG); |
368 | } |
369 | |
370 | static int ds2780_set_control_register(struct ds2780_device_info *dev_info, |
371 | u8 control_reg) |
372 | { |
373 | int ret; |
374 | |
375 | ret = ds2780_write(dev_info, &control_reg, |
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 | |
514 | ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG); |
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 | |
595 | ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG); |
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 | |
622 | ret = ds2780_write(dev_info, &new_setting, |
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 | |
643 | return ds2780_read_block(dev_info, buf, |
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 | |
661 | ret = ds2780_write(dev_info, buf, |
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 | |
696 | return ds2780_read_block(dev_info, buf, |
697 | DS2780_EEPROM_BLOCK0_START + off, count); |
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 | |
714 | ret = ds2780_write(dev_info, buf, |
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 | |
758 | static int ds2780_battery_probe(struct platform_device *pdev) |
759 | { |
760 | int ret = 0; |
761 | struct ds2780_device_info *dev_info; |
762 | |
763 | dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL); |
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"); |
782 | goto fail_free_info; |
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); |
816 | fail_free_info: |
817 | kfree(dev_info); |
818 | fail: |
819 | return ret; |
820 | } |
821 | |
822 | static int ds2780_battery_remove(struct platform_device *pdev) |
823 | { |
824 | struct ds2780_device_info *dev_info = platform_get_drvdata(pdev); |
825 | |
826 | /* remove attributes */ |
827 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); |
828 | |
829 | power_supply_unregister(&dev_info->bat); |
830 | |
831 | kfree(dev_info); |
832 | return 0; |
833 | } |
834 | |
835 | static struct platform_driver ds2780_battery_driver = { |
836 | .driver = { |
837 | .name = "ds2780-battery", |
838 | }, |
839 | .probe = ds2780_battery_probe, |
840 | .remove = ds2780_battery_remove, |
841 | }; |
842 | |
843 | module_platform_driver(ds2780_battery_driver); |
844 | |
845 | MODULE_LICENSE("GPL"); |
846 | MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); |
847 | MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver"); |
848 | MODULE_ALIAS("platform:ds2780-battery"); |
849 |
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