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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; | |
38 | struct power_supply bat; | |
39 | struct device *w1_dev; | |
fef37e9a RS |
40 | }; |
41 | ||
42 | enum current_types { | |
43 | CURRENT_NOW, | |
44 | CURRENT_AVG, | |
45 | }; | |
46 | ||
47 | static const char model[] = "DS2781"; | |
48 | static const char manufacturer[] = "Maxim/Dallas"; | |
49 | ||
50 | static inline struct ds2781_device_info * | |
51 | to_ds2781_device_info(struct power_supply *psy) | |
52 | { | |
53 | return container_of(psy, struct ds2781_device_info, bat); | |
54 | } | |
55 | ||
56 | static inline struct power_supply *to_power_supply(struct device *dev) | |
57 | { | |
58 | return dev_get_drvdata(dev); | |
59 | } | |
60 | ||
61 | static inline int ds2781_battery_io(struct ds2781_device_info *dev_info, | |
62 | char *buf, int addr, size_t count, int io) | |
63 | { | |
b02f8bed | 64 | return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io); |
fef37e9a RS |
65 | } |
66 | ||
67 | int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf, | |
68 | int addr, size_t count) | |
69 | { | |
70 | return ds2781_battery_io(dev_info, buf, addr, count, 0); | |
71 | } | |
72 | ||
73 | static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val, | |
74 | int addr) | |
75 | { | |
76 | return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0); | |
77 | } | |
78 | ||
79 | static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val, | |
80 | int addr) | |
81 | { | |
82 | int ret; | |
83 | u8 raw[2]; | |
84 | ||
85 | ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0); | |
86 | if (ret < 0) | |
87 | return ret; | |
88 | ||
89 | *val = (raw[0] << 8) | raw[1]; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static inline int ds2781_read_block(struct ds2781_device_info *dev_info, | |
95 | u8 *val, int addr, size_t count) | |
96 | { | |
97 | return ds2781_battery_io(dev_info, val, addr, count, 0); | |
98 | } | |
99 | ||
100 | static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val, | |
101 | int addr, size_t count) | |
102 | { | |
103 | return ds2781_battery_io(dev_info, val, addr, count, 1); | |
104 | } | |
105 | ||
106 | static inline int ds2781_store_eeprom(struct device *dev, int addr) | |
107 | { | |
108 | return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA); | |
109 | } | |
110 | ||
111 | static inline int ds2781_recall_eeprom(struct device *dev, int addr) | |
112 | { | |
113 | return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA); | |
114 | } | |
115 | ||
116 | static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg) | |
117 | { | |
118 | int ret; | |
119 | ||
120 | ret = ds2781_store_eeprom(dev_info->w1_dev, reg); | |
121 | if (ret < 0) | |
122 | return ret; | |
123 | ||
124 | ret = ds2781_recall_eeprom(dev_info->w1_dev, reg); | |
125 | if (ret < 0) | |
126 | return ret; | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | /* Set sense resistor value in mhos */ | |
132 | static int ds2781_set_sense_register(struct ds2781_device_info *dev_info, | |
133 | u8 conductance) | |
134 | { | |
135 | int ret; | |
136 | ||
137 | ret = ds2781_write(dev_info, &conductance, | |
138 | DS2781_RSNSP, sizeof(u8)); | |
139 | if (ret < 0) | |
140 | return ret; | |
141 | ||
142 | return ds2781_save_eeprom(dev_info, DS2781_RSNSP); | |
143 | } | |
144 | ||
145 | /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
146 | static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info, | |
147 | u16 *rsgain) | |
148 | { | |
149 | return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB); | |
150 | } | |
151 | ||
152 | /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ | |
153 | static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info, | |
154 | u16 rsgain) | |
155 | { | |
156 | int ret; | |
157 | u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; | |
158 | ||
159 | ret = ds2781_write(dev_info, raw, | |
160 | DS2781_RSGAIN_MSB, sizeof(raw)); | |
161 | if (ret < 0) | |
162 | return ret; | |
163 | ||
164 | return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB); | |
165 | } | |
166 | ||
167 | static int ds2781_get_voltage(struct ds2781_device_info *dev_info, | |
168 | int *voltage_uV) | |
169 | { | |
170 | int ret; | |
171 | char val[2]; | |
172 | int voltage_raw; | |
173 | ||
174 | ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8)); | |
175 | if (ret < 0) | |
176 | return ret; | |
177 | /* | |
178 | * The voltage value is located in 10 bits across the voltage MSB | |
179 | * and LSB registers in two's compliment form | |
180 | * Sign bit of the voltage value is in bit 7 of the voltage MSB register | |
181 | * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the | |
182 | * voltage MSB register | |
183 | * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the | |
184 | * voltage LSB register | |
185 | */ | |
186 | voltage_raw = (val[0] << 3) | | |
187 | (val[1] >> 5); | |
188 | ||
189 | /* DS2781 reports voltage in units of 9.76mV, but the battery class | |
190 | * reports in units of uV, so convert by multiplying by 9760. */ | |
191 | *voltage_uV = voltage_raw * 9760; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int ds2781_get_temperature(struct ds2781_device_info *dev_info, | |
197 | int *temp) | |
198 | { | |
199 | int ret; | |
200 | char val[2]; | |
201 | int temp_raw; | |
202 | ||
203 | ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8)); | |
204 | if (ret < 0) | |
205 | return ret; | |
206 | /* | |
207 | * The temperature value is located in 10 bits across the temperature | |
208 | * MSB and LSB registers in two's compliment form | |
209 | * Sign bit of the temperature value is in bit 7 of the temperature | |
210 | * MSB register | |
211 | * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the | |
212 | * temperature MSB register | |
213 | * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the | |
214 | * temperature LSB register | |
215 | */ | |
216 | temp_raw = ((val[0]) << 3) | | |
217 | (val[1] >> 5); | |
218 | *temp = temp_raw + (temp_raw / 4); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | static int ds2781_get_current(struct ds2781_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 | */ | |
234 | ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); | |
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"); | |
240 | return -EINVAL; | |
241 | } | |
242 | sense_res = 1000 / sense_res_raw; | |
243 | ||
244 | if (type == CURRENT_NOW) | |
245 | reg_msb = DS2781_CURRENT_MSB; | |
246 | else if (type == CURRENT_AVG) | |
247 | reg_msb = DS2781_IAVG_MSB; | |
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 | */ | |
260 | ret = ds2781_read16(dev_info, ¤t_raw, reg_msb); | |
261 | if (ret < 0) | |
262 | return ret; | |
263 | ||
264 | *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res); | |
265 | return 0; | |
266 | } | |
267 | ||
268 | static int ds2781_get_accumulated_current(struct ds2781_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 | */ | |
279 | ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); | |
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 -EINVAL; | |
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 | */ | |
297 | ret = ds2781_read16(dev_info, ¤t_raw, DS2781_ACR_MSB); | |
298 | if (ret < 0) | |
299 | return ret; | |
300 | ||
301 | *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res); | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int ds2781_get_capacity(struct ds2781_device_info *dev_info, | |
306 | int *capacity) | |
307 | { | |
308 | int ret; | |
309 | u8 raw; | |
310 | ||
311 | ret = ds2781_read8(dev_info, &raw, DS2781_RARC); | |
312 | if (ret < 0) | |
313 | return ret; | |
314 | ||
315 | *capacity = raw; | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status) | |
320 | { | |
321 | int ret, current_uA, capacity; | |
322 | ||
323 | ret = ds2781_get_current(dev_info, CURRENT_NOW, ¤t_uA); | |
324 | if (ret < 0) | |
325 | return ret; | |
326 | ||
327 | ret = ds2781_get_capacity(dev_info, &capacity); | |
328 | if (ret < 0) | |
329 | return ret; | |
330 | ||
331 | if (power_supply_am_i_supplied(&dev_info->bat)) { | |
332 | if (capacity == 100) | |
333 | *status = POWER_SUPPLY_STATUS_FULL; | |
334 | else if (current_uA > 50000) | |
335 | *status = POWER_SUPPLY_STATUS_CHARGING; | |
336 | else | |
337 | *status = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
338 | } else { | |
339 | *status = POWER_SUPPLY_STATUS_DISCHARGING; | |
340 | } | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static int ds2781_get_charge_now(struct ds2781_device_info *dev_info, | |
345 | int *charge_now) | |
346 | { | |
347 | int ret; | |
348 | u16 charge_raw; | |
349 | ||
350 | /* | |
351 | * The RAAC value is located in 16 bits across the RAAC MSB and | |
352 | * LSB registers | |
353 | * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC | |
354 | * MSB register | |
355 | * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC | |
356 | * LSB register | |
357 | */ | |
358 | ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB); | |
359 | if (ret < 0) | |
360 | return ret; | |
361 | ||
362 | *charge_now = charge_raw * 1600; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int ds2781_get_control_register(struct ds2781_device_info *dev_info, | |
367 | u8 *control_reg) | |
368 | { | |
369 | return ds2781_read8(dev_info, control_reg, DS2781_CONTROL); | |
370 | } | |
371 | ||
372 | static int ds2781_set_control_register(struct ds2781_device_info *dev_info, | |
373 | u8 control_reg) | |
374 | { | |
375 | int ret; | |
376 | ||
377 | ret = ds2781_write(dev_info, &control_reg, | |
378 | DS2781_CONTROL, sizeof(u8)); | |
379 | if (ret < 0) | |
380 | return ret; | |
381 | ||
382 | return ds2781_save_eeprom(dev_info, DS2781_CONTROL); | |
383 | } | |
384 | ||
385 | static int ds2781_battery_get_property(struct power_supply *psy, | |
386 | enum power_supply_property psp, | |
387 | union power_supply_propval *val) | |
388 | { | |
389 | int ret = 0; | |
390 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
391 | ||
392 | switch (psp) { | |
393 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
394 | ret = ds2781_get_voltage(dev_info, &val->intval); | |
395 | break; | |
396 | ||
397 | case POWER_SUPPLY_PROP_TEMP: | |
398 | ret = ds2781_get_temperature(dev_info, &val->intval); | |
399 | break; | |
400 | ||
401 | case POWER_SUPPLY_PROP_MODEL_NAME: | |
402 | val->strval = model; | |
403 | break; | |
404 | ||
405 | case POWER_SUPPLY_PROP_MANUFACTURER: | |
406 | val->strval = manufacturer; | |
407 | break; | |
408 | ||
409 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
410 | ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval); | |
411 | break; | |
412 | ||
413 | case POWER_SUPPLY_PROP_CURRENT_AVG: | |
414 | ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval); | |
415 | break; | |
416 | ||
417 | case POWER_SUPPLY_PROP_STATUS: | |
418 | ret = ds2781_get_status(dev_info, &val->intval); | |
419 | break; | |
420 | ||
421 | case POWER_SUPPLY_PROP_CAPACITY: | |
422 | ret = ds2781_get_capacity(dev_info, &val->intval); | |
423 | break; | |
424 | ||
425 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: | |
426 | ret = ds2781_get_accumulated_current(dev_info, &val->intval); | |
427 | break; | |
428 | ||
429 | case POWER_SUPPLY_PROP_CHARGE_NOW: | |
430 | ret = ds2781_get_charge_now(dev_info, &val->intval); | |
431 | break; | |
432 | ||
433 | default: | |
434 | ret = -EINVAL; | |
435 | } | |
436 | ||
437 | return ret; | |
438 | } | |
439 | ||
440 | static enum power_supply_property ds2781_battery_props[] = { | |
441 | POWER_SUPPLY_PROP_STATUS, | |
442 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
443 | POWER_SUPPLY_PROP_TEMP, | |
444 | POWER_SUPPLY_PROP_MODEL_NAME, | |
445 | POWER_SUPPLY_PROP_MANUFACTURER, | |
446 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
447 | POWER_SUPPLY_PROP_CURRENT_AVG, | |
448 | POWER_SUPPLY_PROP_CAPACITY, | |
449 | POWER_SUPPLY_PROP_CHARGE_COUNTER, | |
450 | POWER_SUPPLY_PROP_CHARGE_NOW, | |
451 | }; | |
452 | ||
453 | static ssize_t ds2781_get_pmod_enabled(struct device *dev, | |
454 | struct device_attribute *attr, | |
455 | char *buf) | |
456 | { | |
457 | int ret; | |
458 | u8 control_reg; | |
459 | struct power_supply *psy = to_power_supply(dev); | |
460 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
461 | ||
462 | /* Get power mode */ | |
463 | ret = ds2781_get_control_register(dev_info, &control_reg); | |
464 | if (ret < 0) | |
465 | return ret; | |
466 | ||
467 | return sprintf(buf, "%d\n", | |
468 | !!(control_reg & DS2781_CONTROL_PMOD)); | |
469 | } | |
470 | ||
471 | static ssize_t ds2781_set_pmod_enabled(struct device *dev, | |
472 | struct device_attribute *attr, | |
473 | const char *buf, | |
474 | size_t count) | |
475 | { | |
476 | int ret; | |
477 | u8 control_reg, new_setting; | |
478 | struct power_supply *psy = to_power_supply(dev); | |
479 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
480 | ||
481 | /* Set power mode */ | |
482 | ret = ds2781_get_control_register(dev_info, &control_reg); | |
483 | if (ret < 0) | |
484 | return ret; | |
485 | ||
486 | ret = kstrtou8(buf, 0, &new_setting); | |
487 | if (ret < 0) | |
488 | return ret; | |
489 | ||
490 | if ((new_setting != 0) && (new_setting != 1)) { | |
491 | dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n"); | |
492 | return -EINVAL; | |
493 | } | |
494 | ||
495 | if (new_setting) | |
496 | control_reg |= DS2781_CONTROL_PMOD; | |
497 | else | |
498 | control_reg &= ~DS2781_CONTROL_PMOD; | |
499 | ||
500 | ret = ds2781_set_control_register(dev_info, control_reg); | |
501 | if (ret < 0) | |
502 | return ret; | |
503 | ||
504 | return count; | |
505 | } | |
506 | ||
507 | static ssize_t ds2781_get_sense_resistor_value(struct device *dev, | |
508 | struct device_attribute *attr, | |
509 | char *buf) | |
510 | { | |
511 | int ret; | |
512 | u8 sense_resistor; | |
513 | struct power_supply *psy = to_power_supply(dev); | |
514 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
515 | ||
516 | ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP); | |
517 | if (ret < 0) | |
518 | return ret; | |
519 | ||
520 | ret = sprintf(buf, "%d\n", sense_resistor); | |
521 | return ret; | |
522 | } | |
523 | ||
524 | static ssize_t ds2781_set_sense_resistor_value(struct device *dev, | |
525 | struct device_attribute *attr, | |
526 | const char *buf, | |
527 | size_t count) | |
528 | { | |
529 | int ret; | |
530 | u8 new_setting; | |
531 | struct power_supply *psy = to_power_supply(dev); | |
532 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
533 | ||
534 | ret = kstrtou8(buf, 0, &new_setting); | |
535 | if (ret < 0) | |
536 | return ret; | |
537 | ||
538 | ret = ds2781_set_sense_register(dev_info, new_setting); | |
539 | if (ret < 0) | |
540 | return ret; | |
541 | ||
542 | return count; | |
543 | } | |
544 | ||
545 | static ssize_t ds2781_get_rsgain_setting(struct device *dev, | |
546 | struct device_attribute *attr, | |
547 | char *buf) | |
548 | { | |
549 | int ret; | |
550 | u16 rsgain; | |
551 | struct power_supply *psy = to_power_supply(dev); | |
552 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
553 | ||
554 | ret = ds2781_get_rsgain_register(dev_info, &rsgain); | |
555 | if (ret < 0) | |
556 | return ret; | |
557 | ||
558 | return sprintf(buf, "%d\n", rsgain); | |
559 | } | |
560 | ||
561 | static ssize_t ds2781_set_rsgain_setting(struct device *dev, | |
562 | struct device_attribute *attr, | |
563 | const char *buf, | |
564 | size_t count) | |
565 | { | |
566 | int ret; | |
567 | u16 new_setting; | |
568 | struct power_supply *psy = to_power_supply(dev); | |
569 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
570 | ||
571 | ret = kstrtou16(buf, 0, &new_setting); | |
572 | if (ret < 0) | |
573 | return ret; | |
574 | ||
575 | /* Gain can only be from 0 to 1.999 in steps of .001 */ | |
576 | if (new_setting > 1999) { | |
577 | dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n"); | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
581 | ret = ds2781_set_rsgain_register(dev_info, new_setting); | |
582 | if (ret < 0) | |
583 | return ret; | |
584 | ||
585 | return count; | |
586 | } | |
587 | ||
588 | static ssize_t ds2781_get_pio_pin(struct device *dev, | |
589 | struct device_attribute *attr, | |
590 | char *buf) | |
591 | { | |
592 | int ret; | |
593 | u8 sfr; | |
594 | struct power_supply *psy = to_power_supply(dev); | |
595 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
596 | ||
597 | ret = ds2781_read8(dev_info, &sfr, DS2781_SFR); | |
598 | if (ret < 0) | |
599 | return ret; | |
600 | ||
601 | ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC); | |
602 | return ret; | |
603 | } | |
604 | ||
605 | static ssize_t ds2781_set_pio_pin(struct device *dev, | |
606 | struct device_attribute *attr, | |
607 | const char *buf, | |
608 | size_t count) | |
609 | { | |
610 | int ret; | |
611 | u8 new_setting; | |
612 | struct power_supply *psy = to_power_supply(dev); | |
613 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
614 | ||
615 | ret = kstrtou8(buf, 0, &new_setting); | |
616 | if (ret < 0) | |
617 | return ret; | |
618 | ||
619 | if ((new_setting != 0) && (new_setting != 1)) { | |
620 | dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n"); | |
621 | return -EINVAL; | |
622 | } | |
623 | ||
624 | ret = ds2781_write(dev_info, &new_setting, | |
625 | DS2781_SFR, sizeof(u8)); | |
626 | if (ret < 0) | |
627 | return ret; | |
628 | ||
629 | return count; | |
630 | } | |
631 | ||
632 | static ssize_t ds2781_read_param_eeprom_bin(struct file *filp, | |
633 | struct kobject *kobj, | |
634 | struct bin_attribute *bin_attr, | |
635 | char *buf, loff_t off, size_t count) | |
636 | { | |
637 | struct device *dev = container_of(kobj, struct device, kobj); | |
638 | struct power_supply *psy = to_power_supply(dev); | |
639 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
640 | ||
13f2483c | 641 | count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off); |
fef37e9a RS |
642 | |
643 | return ds2781_read_block(dev_info, buf, | |
644 | DS2781_EEPROM_BLOCK1_START + off, count); | |
645 | } | |
646 | ||
647 | static ssize_t ds2781_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 ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
655 | int ret; | |
656 | ||
13f2483c | 657 | count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off); |
fef37e9a RS |
658 | |
659 | ret = ds2781_write(dev_info, buf, | |
660 | DS2781_EEPROM_BLOCK1_START + off, count); | |
661 | if (ret < 0) | |
662 | return ret; | |
663 | ||
664 | ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START); | |
665 | if (ret < 0) | |
666 | return ret; | |
667 | ||
668 | return count; | |
669 | } | |
670 | ||
671 | static struct bin_attribute ds2781_param_eeprom_bin_attr = { | |
672 | .attr = { | |
673 | .name = "param_eeprom", | |
674 | .mode = S_IRUGO | S_IWUSR, | |
675 | }, | |
13f2483c | 676 | .size = DS2781_PARAM_EEPROM_SIZE, |
fef37e9a RS |
677 | .read = ds2781_read_param_eeprom_bin, |
678 | .write = ds2781_write_param_eeprom_bin, | |
679 | }; | |
680 | ||
681 | static ssize_t ds2781_read_user_eeprom_bin(struct file *filp, | |
682 | struct kobject *kobj, | |
683 | struct bin_attribute *bin_attr, | |
684 | char *buf, loff_t off, size_t count) | |
685 | { | |
686 | struct device *dev = container_of(kobj, struct device, kobj); | |
687 | struct power_supply *psy = to_power_supply(dev); | |
688 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
689 | ||
13f2483c | 690 | count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off); |
fef37e9a RS |
691 | |
692 | return ds2781_read_block(dev_info, buf, | |
693 | DS2781_EEPROM_BLOCK0_START + off, count); | |
694 | ||
695 | } | |
696 | ||
697 | static ssize_t ds2781_write_user_eeprom_bin(struct file *filp, | |
698 | struct kobject *kobj, | |
699 | struct bin_attribute *bin_attr, | |
700 | char *buf, loff_t off, size_t count) | |
701 | { | |
702 | struct device *dev = container_of(kobj, struct device, kobj); | |
703 | struct power_supply *psy = to_power_supply(dev); | |
704 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); | |
705 | int ret; | |
706 | ||
13f2483c | 707 | count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off); |
fef37e9a RS |
708 | |
709 | ret = ds2781_write(dev_info, buf, | |
710 | DS2781_EEPROM_BLOCK0_START + off, count); | |
711 | if (ret < 0) | |
712 | return ret; | |
713 | ||
714 | ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START); | |
715 | if (ret < 0) | |
716 | return ret; | |
717 | ||
718 | return count; | |
719 | } | |
720 | ||
721 | static struct bin_attribute ds2781_user_eeprom_bin_attr = { | |
722 | .attr = { | |
723 | .name = "user_eeprom", | |
724 | .mode = S_IRUGO | S_IWUSR, | |
725 | }, | |
13f2483c | 726 | .size = DS2781_USER_EEPROM_SIZE, |
fef37e9a RS |
727 | .read = ds2781_read_user_eeprom_bin, |
728 | .write = ds2781_write_user_eeprom_bin, | |
729 | }; | |
730 | ||
731 | static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled, | |
732 | ds2781_set_pmod_enabled); | |
733 | static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, | |
734 | ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value); | |
735 | static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting, | |
736 | ds2781_set_rsgain_setting); | |
737 | static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin, | |
738 | ds2781_set_pio_pin); | |
739 | ||
740 | ||
741 | static struct attribute *ds2781_attributes[] = { | |
742 | &dev_attr_pmod_enabled.attr, | |
743 | &dev_attr_sense_resistor_value.attr, | |
744 | &dev_attr_rsgain_setting.attr, | |
745 | &dev_attr_pio_pin.attr, | |
746 | NULL | |
747 | }; | |
748 | ||
749 | static const struct attribute_group ds2781_attr_group = { | |
750 | .attrs = ds2781_attributes, | |
751 | }; | |
752 | ||
753 | static int __devinit ds2781_battery_probe(struct platform_device *pdev) | |
754 | { | |
755 | int ret = 0; | |
756 | struct ds2781_device_info *dev_info; | |
757 | ||
758 | dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL); | |
759 | if (!dev_info) { | |
760 | ret = -ENOMEM; | |
761 | goto fail; | |
762 | } | |
763 | ||
764 | platform_set_drvdata(pdev, dev_info); | |
765 | ||
766 | dev_info->dev = &pdev->dev; | |
767 | dev_info->w1_dev = pdev->dev.parent; | |
768 | dev_info->bat.name = dev_name(&pdev->dev); | |
769 | dev_info->bat.type = POWER_SUPPLY_TYPE_BATTERY; | |
770 | dev_info->bat.properties = ds2781_battery_props; | |
771 | dev_info->bat.num_properties = ARRAY_SIZE(ds2781_battery_props); | |
772 | dev_info->bat.get_property = ds2781_battery_get_property; | |
fef37e9a RS |
773 | |
774 | ret = power_supply_register(&pdev->dev, &dev_info->bat); | |
775 | if (ret) { | |
776 | dev_err(dev_info->dev, "failed to register battery\n"); | |
777 | goto fail_free_info; | |
778 | } | |
779 | ||
780 | ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2781_attr_group); | |
781 | if (ret) { | |
782 | dev_err(dev_info->dev, "failed to create sysfs group\n"); | |
783 | goto fail_unregister; | |
784 | } | |
785 | ||
786 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, | |
787 | &ds2781_param_eeprom_bin_attr); | |
788 | if (ret) { | |
789 | dev_err(dev_info->dev, | |
790 | "failed to create param eeprom bin file"); | |
791 | goto fail_remove_group; | |
792 | } | |
793 | ||
794 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, | |
795 | &ds2781_user_eeprom_bin_attr); | |
796 | if (ret) { | |
797 | dev_err(dev_info->dev, | |
798 | "failed to create user eeprom bin file"); | |
799 | goto fail_remove_bin_file; | |
800 | } | |
801 | ||
fef37e9a RS |
802 | return 0; |
803 | ||
804 | fail_remove_bin_file: | |
805 | sysfs_remove_bin_file(&dev_info->bat.dev->kobj, | |
806 | &ds2781_param_eeprom_bin_attr); | |
807 | fail_remove_group: | |
808 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group); | |
809 | fail_unregister: | |
810 | power_supply_unregister(&dev_info->bat); | |
811 | fail_free_info: | |
812 | kfree(dev_info); | |
813 | fail: | |
814 | return ret; | |
815 | } | |
816 | ||
817 | static int __devexit ds2781_battery_remove(struct platform_device *pdev) | |
818 | { | |
819 | struct ds2781_device_info *dev_info = platform_get_drvdata(pdev); | |
820 | ||
fef37e9a RS |
821 | /* remove attributes */ |
822 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group); | |
823 | ||
824 | power_supply_unregister(&dev_info->bat); | |
825 | ||
826 | kfree(dev_info); | |
827 | return 0; | |
828 | } | |
829 | ||
830 | static struct platform_driver ds2781_battery_driver = { | |
831 | .driver = { | |
832 | .name = "ds2781-battery", | |
833 | }, | |
834 | .probe = ds2781_battery_probe, | |
835 | .remove = __devexit_p(ds2781_battery_remove), | |
836 | }; | |
837 | ||
838 | static int __init ds2781_battery_init(void) | |
839 | { | |
840 | return platform_driver_register(&ds2781_battery_driver); | |
841 | } | |
842 | ||
843 | static void __exit ds2781_battery_exit(void) | |
844 | { | |
845 | platform_driver_unregister(&ds2781_battery_driver); | |
846 | } | |
847 | ||
848 | module_init(ds2781_battery_init); | |
849 | module_exit(ds2781_battery_exit); | |
850 | ||
851 | ||
852 | MODULE_LICENSE("GPL"); | |
853 | MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>"); | |
854 | MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver"); | |
855 | MODULE_ALIAS("platform:ds2781-battery"); | |
856 |