Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 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; |
| 40 | struct task_struct *mutex_holder; |
| 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 | { |
| 54 | return container_of(psy, struct ds2781_device_info, bat); |
| 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 | { |
| 65 | if (dev_info->mutex_holder == current) |
| 66 | return w1_ds2781_io_nolock(dev_info->w1_dev, buf, addr, |
| 67 | count, io); |
| 68 | else |
| 69 | return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io); |
| 70 | } |
| 71 | |
Anton Vorontsov | 7dbae55 | 2012-06-17 21:20:05 -0700 | [diff] [blame^] | 72 | static int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf, |
Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 73 | int addr, size_t count) |
| 74 | { |
| 75 | return ds2781_battery_io(dev_info, buf, addr, count, 0); |
| 76 | } |
| 77 | |
| 78 | static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val, |
| 79 | int addr) |
| 80 | { |
| 81 | return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0); |
| 82 | } |
| 83 | |
| 84 | static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val, |
| 85 | int addr) |
| 86 | { |
| 87 | int ret; |
| 88 | u8 raw[2]; |
| 89 | |
| 90 | ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0); |
| 91 | if (ret < 0) |
| 92 | return ret; |
| 93 | |
| 94 | *val = (raw[0] << 8) | raw[1]; |
| 95 | |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static inline int ds2781_read_block(struct ds2781_device_info *dev_info, |
| 100 | u8 *val, int addr, size_t count) |
| 101 | { |
| 102 | return ds2781_battery_io(dev_info, val, addr, count, 0); |
| 103 | } |
| 104 | |
| 105 | static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val, |
| 106 | int addr, size_t count) |
| 107 | { |
| 108 | return ds2781_battery_io(dev_info, val, addr, count, 1); |
| 109 | } |
| 110 | |
| 111 | static inline int ds2781_store_eeprom(struct device *dev, int addr) |
| 112 | { |
| 113 | return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA); |
| 114 | } |
| 115 | |
| 116 | static inline int ds2781_recall_eeprom(struct device *dev, int addr) |
| 117 | { |
| 118 | return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA); |
| 119 | } |
| 120 | |
| 121 | static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg) |
| 122 | { |
| 123 | int ret; |
| 124 | |
| 125 | ret = ds2781_store_eeprom(dev_info->w1_dev, reg); |
| 126 | if (ret < 0) |
| 127 | return ret; |
| 128 | |
| 129 | ret = ds2781_recall_eeprom(dev_info->w1_dev, reg); |
| 130 | if (ret < 0) |
| 131 | return ret; |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | /* Set sense resistor value in mhos */ |
| 137 | static int ds2781_set_sense_register(struct ds2781_device_info *dev_info, |
| 138 | u8 conductance) |
| 139 | { |
| 140 | int ret; |
| 141 | |
| 142 | ret = ds2781_write(dev_info, &conductance, |
| 143 | DS2781_RSNSP, sizeof(u8)); |
| 144 | if (ret < 0) |
| 145 | return ret; |
| 146 | |
| 147 | return ds2781_save_eeprom(dev_info, DS2781_RSNSP); |
| 148 | } |
| 149 | |
| 150 | /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ |
| 151 | static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info, |
| 152 | u16 *rsgain) |
| 153 | { |
| 154 | return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB); |
| 155 | } |
| 156 | |
| 157 | /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ |
| 158 | static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info, |
| 159 | u16 rsgain) |
| 160 | { |
| 161 | int ret; |
| 162 | u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; |
| 163 | |
| 164 | ret = ds2781_write(dev_info, raw, |
| 165 | DS2781_RSGAIN_MSB, sizeof(raw)); |
| 166 | if (ret < 0) |
| 167 | return ret; |
| 168 | |
| 169 | return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB); |
| 170 | } |
| 171 | |
| 172 | static int ds2781_get_voltage(struct ds2781_device_info *dev_info, |
| 173 | int *voltage_uV) |
| 174 | { |
| 175 | int ret; |
| 176 | char val[2]; |
| 177 | int voltage_raw; |
| 178 | |
| 179 | ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8)); |
| 180 | if (ret < 0) |
| 181 | return ret; |
| 182 | /* |
| 183 | * The voltage value is located in 10 bits across the voltage MSB |
| 184 | * and LSB registers in two's compliment form |
| 185 | * Sign bit of the voltage value is in bit 7 of the voltage MSB register |
| 186 | * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the |
| 187 | * voltage MSB register |
| 188 | * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the |
| 189 | * voltage LSB register |
| 190 | */ |
| 191 | voltage_raw = (val[0] << 3) | |
| 192 | (val[1] >> 5); |
| 193 | |
| 194 | /* DS2781 reports voltage in units of 9.76mV, but the battery class |
| 195 | * reports in units of uV, so convert by multiplying by 9760. */ |
| 196 | *voltage_uV = voltage_raw * 9760; |
| 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | static int ds2781_get_temperature(struct ds2781_device_info *dev_info, |
| 202 | int *temp) |
| 203 | { |
| 204 | int ret; |
| 205 | char val[2]; |
| 206 | int temp_raw; |
| 207 | |
| 208 | ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8)); |
| 209 | if (ret < 0) |
| 210 | return ret; |
| 211 | /* |
| 212 | * The temperature value is located in 10 bits across the temperature |
| 213 | * MSB and LSB registers in two's compliment form |
| 214 | * Sign bit of the temperature value is in bit 7 of the temperature |
| 215 | * MSB register |
| 216 | * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the |
| 217 | * temperature MSB register |
| 218 | * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the |
| 219 | * temperature LSB register |
| 220 | */ |
| 221 | temp_raw = ((val[0]) << 3) | |
| 222 | (val[1] >> 5); |
| 223 | *temp = temp_raw + (temp_raw / 4); |
| 224 | |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | static int ds2781_get_current(struct ds2781_device_info *dev_info, |
| 229 | enum current_types type, int *current_uA) |
| 230 | { |
| 231 | int ret, sense_res; |
| 232 | s16 current_raw; |
| 233 | u8 sense_res_raw, reg_msb; |
| 234 | |
| 235 | /* |
| 236 | * The units of measurement for current are dependent on the value of |
| 237 | * the sense resistor. |
| 238 | */ |
| 239 | ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); |
| 240 | if (ret < 0) |
| 241 | return ret; |
| 242 | |
| 243 | if (sense_res_raw == 0) { |
| 244 | dev_err(dev_info->dev, "sense resistor value is 0\n"); |
| 245 | return -EINVAL; |
| 246 | } |
| 247 | sense_res = 1000 / sense_res_raw; |
| 248 | |
| 249 | if (type == CURRENT_NOW) |
| 250 | reg_msb = DS2781_CURRENT_MSB; |
| 251 | else if (type == CURRENT_AVG) |
| 252 | reg_msb = DS2781_IAVG_MSB; |
| 253 | else |
| 254 | return -EINVAL; |
| 255 | |
| 256 | /* |
| 257 | * The current value is located in 16 bits across the current MSB |
| 258 | * and LSB registers in two's compliment form |
| 259 | * Sign bit of the current value is in bit 7 of the current MSB register |
| 260 | * Bits 14 - 8 of the current value are in bits 6 - 0 of the current |
| 261 | * MSB register |
| 262 | * Bits 7 - 0 of the current value are in bits 7 - 0 of the current |
| 263 | * LSB register |
| 264 | */ |
| 265 | ret = ds2781_read16(dev_info, ¤t_raw, reg_msb); |
| 266 | if (ret < 0) |
| 267 | return ret; |
| 268 | |
| 269 | *current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res); |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info, |
| 274 | int *accumulated_current) |
| 275 | { |
| 276 | int ret, sense_res; |
| 277 | s16 current_raw; |
| 278 | u8 sense_res_raw; |
| 279 | |
| 280 | /* |
| 281 | * The units of measurement for accumulated current are dependent on |
| 282 | * the value of the sense resistor. |
| 283 | */ |
| 284 | ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP); |
| 285 | if (ret < 0) |
| 286 | return ret; |
| 287 | |
| 288 | if (sense_res_raw == 0) { |
| 289 | dev_err(dev_info->dev, "sense resistor value is 0\n"); |
| 290 | return -EINVAL; |
| 291 | } |
| 292 | sense_res = 1000 / sense_res_raw; |
| 293 | |
| 294 | /* |
| 295 | * The ACR value is located in 16 bits across the ACR MSB and |
| 296 | * LSB registers |
| 297 | * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR |
| 298 | * MSB register |
| 299 | * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR |
| 300 | * LSB register |
| 301 | */ |
| 302 | ret = ds2781_read16(dev_info, ¤t_raw, DS2781_ACR_MSB); |
| 303 | if (ret < 0) |
| 304 | return ret; |
| 305 | |
| 306 | *accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res); |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | static int ds2781_get_capacity(struct ds2781_device_info *dev_info, |
| 311 | int *capacity) |
| 312 | { |
| 313 | int ret; |
| 314 | u8 raw; |
| 315 | |
| 316 | ret = ds2781_read8(dev_info, &raw, DS2781_RARC); |
| 317 | if (ret < 0) |
| 318 | return ret; |
| 319 | |
| 320 | *capacity = raw; |
| 321 | return 0; |
| 322 | } |
| 323 | |
| 324 | static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status) |
| 325 | { |
| 326 | int ret, current_uA, capacity; |
| 327 | |
| 328 | ret = ds2781_get_current(dev_info, CURRENT_NOW, ¤t_uA); |
| 329 | if (ret < 0) |
| 330 | return ret; |
| 331 | |
| 332 | ret = ds2781_get_capacity(dev_info, &capacity); |
| 333 | if (ret < 0) |
| 334 | return ret; |
| 335 | |
| 336 | if (power_supply_am_i_supplied(&dev_info->bat)) { |
| 337 | if (capacity == 100) |
| 338 | *status = POWER_SUPPLY_STATUS_FULL; |
| 339 | else if (current_uA > 50000) |
| 340 | *status = POWER_SUPPLY_STATUS_CHARGING; |
| 341 | else |
| 342 | *status = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 343 | } else { |
| 344 | *status = POWER_SUPPLY_STATUS_DISCHARGING; |
| 345 | } |
| 346 | return 0; |
| 347 | } |
| 348 | |
| 349 | static int ds2781_get_charge_now(struct ds2781_device_info *dev_info, |
| 350 | int *charge_now) |
| 351 | { |
| 352 | int ret; |
| 353 | u16 charge_raw; |
| 354 | |
| 355 | /* |
| 356 | * The RAAC value is located in 16 bits across the RAAC MSB and |
| 357 | * LSB registers |
| 358 | * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC |
| 359 | * MSB register |
| 360 | * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC |
| 361 | * LSB register |
| 362 | */ |
| 363 | ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB); |
| 364 | if (ret < 0) |
| 365 | return ret; |
| 366 | |
| 367 | *charge_now = charge_raw * 1600; |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static int ds2781_get_control_register(struct ds2781_device_info *dev_info, |
| 372 | u8 *control_reg) |
| 373 | { |
| 374 | return ds2781_read8(dev_info, control_reg, DS2781_CONTROL); |
| 375 | } |
| 376 | |
| 377 | static int ds2781_set_control_register(struct ds2781_device_info *dev_info, |
| 378 | u8 control_reg) |
| 379 | { |
| 380 | int ret; |
| 381 | |
| 382 | ret = ds2781_write(dev_info, &control_reg, |
| 383 | DS2781_CONTROL, sizeof(u8)); |
| 384 | if (ret < 0) |
| 385 | return ret; |
| 386 | |
| 387 | return ds2781_save_eeprom(dev_info, DS2781_CONTROL); |
| 388 | } |
| 389 | |
| 390 | static int ds2781_battery_get_property(struct power_supply *psy, |
| 391 | enum power_supply_property psp, |
| 392 | union power_supply_propval *val) |
| 393 | { |
| 394 | int ret = 0; |
| 395 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 396 | |
| 397 | switch (psp) { |
| 398 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| 399 | ret = ds2781_get_voltage(dev_info, &val->intval); |
| 400 | break; |
| 401 | |
| 402 | case POWER_SUPPLY_PROP_TEMP: |
| 403 | ret = ds2781_get_temperature(dev_info, &val->intval); |
| 404 | break; |
| 405 | |
| 406 | case POWER_SUPPLY_PROP_MODEL_NAME: |
| 407 | val->strval = model; |
| 408 | break; |
| 409 | |
| 410 | case POWER_SUPPLY_PROP_MANUFACTURER: |
| 411 | val->strval = manufacturer; |
| 412 | break; |
| 413 | |
| 414 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
| 415 | ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval); |
| 416 | break; |
| 417 | |
| 418 | case POWER_SUPPLY_PROP_CURRENT_AVG: |
| 419 | ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval); |
| 420 | break; |
| 421 | |
| 422 | case POWER_SUPPLY_PROP_STATUS: |
| 423 | ret = ds2781_get_status(dev_info, &val->intval); |
| 424 | break; |
| 425 | |
| 426 | case POWER_SUPPLY_PROP_CAPACITY: |
| 427 | ret = ds2781_get_capacity(dev_info, &val->intval); |
| 428 | break; |
| 429 | |
| 430 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
| 431 | ret = ds2781_get_accumulated_current(dev_info, &val->intval); |
| 432 | break; |
| 433 | |
| 434 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
| 435 | ret = ds2781_get_charge_now(dev_info, &val->intval); |
| 436 | break; |
| 437 | |
| 438 | default: |
| 439 | ret = -EINVAL; |
| 440 | } |
| 441 | |
| 442 | return ret; |
| 443 | } |
| 444 | |
| 445 | static enum power_supply_property ds2781_battery_props[] = { |
| 446 | POWER_SUPPLY_PROP_STATUS, |
| 447 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 448 | POWER_SUPPLY_PROP_TEMP, |
| 449 | POWER_SUPPLY_PROP_MODEL_NAME, |
| 450 | POWER_SUPPLY_PROP_MANUFACTURER, |
| 451 | POWER_SUPPLY_PROP_CURRENT_NOW, |
| 452 | POWER_SUPPLY_PROP_CURRENT_AVG, |
| 453 | POWER_SUPPLY_PROP_CAPACITY, |
| 454 | POWER_SUPPLY_PROP_CHARGE_COUNTER, |
| 455 | POWER_SUPPLY_PROP_CHARGE_NOW, |
| 456 | }; |
| 457 | |
| 458 | static ssize_t ds2781_get_pmod_enabled(struct device *dev, |
| 459 | struct device_attribute *attr, |
| 460 | char *buf) |
| 461 | { |
| 462 | int ret; |
| 463 | u8 control_reg; |
| 464 | struct power_supply *psy = to_power_supply(dev); |
| 465 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 466 | |
| 467 | /* Get power mode */ |
| 468 | ret = ds2781_get_control_register(dev_info, &control_reg); |
| 469 | if (ret < 0) |
| 470 | return ret; |
| 471 | |
| 472 | return sprintf(buf, "%d\n", |
| 473 | !!(control_reg & DS2781_CONTROL_PMOD)); |
| 474 | } |
| 475 | |
| 476 | static ssize_t ds2781_set_pmod_enabled(struct device *dev, |
| 477 | struct device_attribute *attr, |
| 478 | const char *buf, |
| 479 | size_t count) |
| 480 | { |
| 481 | int ret; |
| 482 | u8 control_reg, new_setting; |
| 483 | struct power_supply *psy = to_power_supply(dev); |
| 484 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 485 | |
| 486 | /* Set power mode */ |
| 487 | ret = ds2781_get_control_register(dev_info, &control_reg); |
| 488 | if (ret < 0) |
| 489 | return ret; |
| 490 | |
| 491 | ret = kstrtou8(buf, 0, &new_setting); |
| 492 | if (ret < 0) |
| 493 | return ret; |
| 494 | |
| 495 | if ((new_setting != 0) && (new_setting != 1)) { |
| 496 | dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n"); |
| 497 | return -EINVAL; |
| 498 | } |
| 499 | |
| 500 | if (new_setting) |
| 501 | control_reg |= DS2781_CONTROL_PMOD; |
| 502 | else |
| 503 | control_reg &= ~DS2781_CONTROL_PMOD; |
| 504 | |
| 505 | ret = ds2781_set_control_register(dev_info, control_reg); |
| 506 | if (ret < 0) |
| 507 | return ret; |
| 508 | |
| 509 | return count; |
| 510 | } |
| 511 | |
| 512 | static ssize_t ds2781_get_sense_resistor_value(struct device *dev, |
| 513 | struct device_attribute *attr, |
| 514 | char *buf) |
| 515 | { |
| 516 | int ret; |
| 517 | u8 sense_resistor; |
| 518 | struct power_supply *psy = to_power_supply(dev); |
| 519 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 520 | |
| 521 | ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP); |
| 522 | if (ret < 0) |
| 523 | return ret; |
| 524 | |
| 525 | ret = sprintf(buf, "%d\n", sense_resistor); |
| 526 | return ret; |
| 527 | } |
| 528 | |
| 529 | static ssize_t ds2781_set_sense_resistor_value(struct device *dev, |
| 530 | struct device_attribute *attr, |
| 531 | const char *buf, |
| 532 | size_t count) |
| 533 | { |
| 534 | int ret; |
| 535 | u8 new_setting; |
| 536 | struct power_supply *psy = to_power_supply(dev); |
| 537 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 538 | |
| 539 | ret = kstrtou8(buf, 0, &new_setting); |
| 540 | if (ret < 0) |
| 541 | return ret; |
| 542 | |
| 543 | ret = ds2781_set_sense_register(dev_info, new_setting); |
| 544 | if (ret < 0) |
| 545 | return ret; |
| 546 | |
| 547 | return count; |
| 548 | } |
| 549 | |
| 550 | static ssize_t ds2781_get_rsgain_setting(struct device *dev, |
| 551 | struct device_attribute *attr, |
| 552 | char *buf) |
| 553 | { |
| 554 | int ret; |
| 555 | u16 rsgain; |
| 556 | struct power_supply *psy = to_power_supply(dev); |
| 557 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 558 | |
| 559 | ret = ds2781_get_rsgain_register(dev_info, &rsgain); |
| 560 | if (ret < 0) |
| 561 | return ret; |
| 562 | |
| 563 | return sprintf(buf, "%d\n", rsgain); |
| 564 | } |
| 565 | |
| 566 | static ssize_t ds2781_set_rsgain_setting(struct device *dev, |
| 567 | struct device_attribute *attr, |
| 568 | const char *buf, |
| 569 | size_t count) |
| 570 | { |
| 571 | int ret; |
| 572 | u16 new_setting; |
| 573 | struct power_supply *psy = to_power_supply(dev); |
| 574 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 575 | |
| 576 | ret = kstrtou16(buf, 0, &new_setting); |
| 577 | if (ret < 0) |
| 578 | return ret; |
| 579 | |
| 580 | /* Gain can only be from 0 to 1.999 in steps of .001 */ |
| 581 | if (new_setting > 1999) { |
| 582 | dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n"); |
| 583 | return -EINVAL; |
| 584 | } |
| 585 | |
| 586 | ret = ds2781_set_rsgain_register(dev_info, new_setting); |
| 587 | if (ret < 0) |
| 588 | return ret; |
| 589 | |
| 590 | return count; |
| 591 | } |
| 592 | |
| 593 | static ssize_t ds2781_get_pio_pin(struct device *dev, |
| 594 | struct device_attribute *attr, |
| 595 | char *buf) |
| 596 | { |
| 597 | int ret; |
| 598 | u8 sfr; |
| 599 | struct power_supply *psy = to_power_supply(dev); |
| 600 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 601 | |
| 602 | ret = ds2781_read8(dev_info, &sfr, DS2781_SFR); |
| 603 | if (ret < 0) |
| 604 | return ret; |
| 605 | |
| 606 | ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC); |
| 607 | return ret; |
| 608 | } |
| 609 | |
| 610 | static ssize_t ds2781_set_pio_pin(struct device *dev, |
| 611 | struct device_attribute *attr, |
| 612 | const char *buf, |
| 613 | size_t count) |
| 614 | { |
| 615 | int ret; |
| 616 | u8 new_setting; |
| 617 | struct power_supply *psy = to_power_supply(dev); |
| 618 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 619 | |
| 620 | ret = kstrtou8(buf, 0, &new_setting); |
| 621 | if (ret < 0) |
| 622 | return ret; |
| 623 | |
| 624 | if ((new_setting != 0) && (new_setting != 1)) { |
| 625 | dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n"); |
| 626 | return -EINVAL; |
| 627 | } |
| 628 | |
| 629 | ret = ds2781_write(dev_info, &new_setting, |
| 630 | DS2781_SFR, sizeof(u8)); |
| 631 | if (ret < 0) |
| 632 | return ret; |
| 633 | |
| 634 | return count; |
| 635 | } |
| 636 | |
| 637 | static ssize_t ds2781_read_param_eeprom_bin(struct file *filp, |
| 638 | struct kobject *kobj, |
| 639 | struct bin_attribute *bin_attr, |
| 640 | char *buf, loff_t off, size_t count) |
| 641 | { |
| 642 | struct device *dev = container_of(kobj, struct device, kobj); |
| 643 | struct power_supply *psy = to_power_supply(dev); |
| 644 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 645 | |
Axel Lin | 13f2483 | 2012-03-17 15:37:31 +0800 | [diff] [blame] | 646 | count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off); |
Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 647 | |
| 648 | return ds2781_read_block(dev_info, buf, |
| 649 | DS2781_EEPROM_BLOCK1_START + off, count); |
| 650 | } |
| 651 | |
| 652 | static ssize_t ds2781_write_param_eeprom_bin(struct file *filp, |
| 653 | struct kobject *kobj, |
| 654 | struct bin_attribute *bin_attr, |
| 655 | char *buf, loff_t off, size_t count) |
| 656 | { |
| 657 | struct device *dev = container_of(kobj, struct device, kobj); |
| 658 | struct power_supply *psy = to_power_supply(dev); |
| 659 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 660 | int ret; |
| 661 | |
Axel Lin | 13f2483 | 2012-03-17 15:37:31 +0800 | [diff] [blame] | 662 | count = min_t(loff_t, count, DS2781_PARAM_EEPROM_SIZE - off); |
Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 663 | |
| 664 | ret = ds2781_write(dev_info, buf, |
| 665 | DS2781_EEPROM_BLOCK1_START + off, count); |
| 666 | if (ret < 0) |
| 667 | return ret; |
| 668 | |
| 669 | ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START); |
| 670 | if (ret < 0) |
| 671 | return ret; |
| 672 | |
| 673 | return count; |
| 674 | } |
| 675 | |
| 676 | static struct bin_attribute ds2781_param_eeprom_bin_attr = { |
| 677 | .attr = { |
| 678 | .name = "param_eeprom", |
| 679 | .mode = S_IRUGO | S_IWUSR, |
| 680 | }, |
Axel Lin | 13f2483 | 2012-03-17 15:37:31 +0800 | [diff] [blame] | 681 | .size = DS2781_PARAM_EEPROM_SIZE, |
Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 682 | .read = ds2781_read_param_eeprom_bin, |
| 683 | .write = ds2781_write_param_eeprom_bin, |
| 684 | }; |
| 685 | |
| 686 | static ssize_t ds2781_read_user_eeprom_bin(struct file *filp, |
| 687 | struct kobject *kobj, |
| 688 | struct bin_attribute *bin_attr, |
| 689 | char *buf, loff_t off, size_t count) |
| 690 | { |
| 691 | struct device *dev = container_of(kobj, struct device, kobj); |
| 692 | struct power_supply *psy = to_power_supply(dev); |
| 693 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 694 | |
Axel Lin | 13f2483 | 2012-03-17 15:37:31 +0800 | [diff] [blame] | 695 | count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off); |
Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 696 | |
| 697 | return ds2781_read_block(dev_info, buf, |
| 698 | DS2781_EEPROM_BLOCK0_START + off, count); |
| 699 | |
| 700 | } |
| 701 | |
| 702 | static ssize_t ds2781_write_user_eeprom_bin(struct file *filp, |
| 703 | struct kobject *kobj, |
| 704 | struct bin_attribute *bin_attr, |
| 705 | char *buf, loff_t off, size_t count) |
| 706 | { |
| 707 | struct device *dev = container_of(kobj, struct device, kobj); |
| 708 | struct power_supply *psy = to_power_supply(dev); |
| 709 | struct ds2781_device_info *dev_info = to_ds2781_device_info(psy); |
| 710 | int ret; |
| 711 | |
Axel Lin | 13f2483 | 2012-03-17 15:37:31 +0800 | [diff] [blame] | 712 | count = min_t(loff_t, count, DS2781_USER_EEPROM_SIZE - off); |
Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 713 | |
| 714 | ret = ds2781_write(dev_info, buf, |
| 715 | DS2781_EEPROM_BLOCK0_START + off, count); |
| 716 | if (ret < 0) |
| 717 | return ret; |
| 718 | |
| 719 | ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START); |
| 720 | if (ret < 0) |
| 721 | return ret; |
| 722 | |
| 723 | return count; |
| 724 | } |
| 725 | |
| 726 | static struct bin_attribute ds2781_user_eeprom_bin_attr = { |
| 727 | .attr = { |
| 728 | .name = "user_eeprom", |
| 729 | .mode = S_IRUGO | S_IWUSR, |
| 730 | }, |
Axel Lin | 13f2483 | 2012-03-17 15:37:31 +0800 | [diff] [blame] | 731 | .size = DS2781_USER_EEPROM_SIZE, |
Renata Sayakhova | fef37e9 | 2012-02-29 14:58:53 +0100 | [diff] [blame] | 732 | .read = ds2781_read_user_eeprom_bin, |
| 733 | .write = ds2781_write_user_eeprom_bin, |
| 734 | }; |
| 735 | |
| 736 | static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled, |
| 737 | ds2781_set_pmod_enabled); |
| 738 | static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, |
| 739 | ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value); |
| 740 | static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting, |
| 741 | ds2781_set_rsgain_setting); |
| 742 | static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin, |
| 743 | ds2781_set_pio_pin); |
| 744 | |
| 745 | |
| 746 | static struct attribute *ds2781_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 ds2781_attr_group = { |
| 755 | .attrs = ds2781_attributes, |
| 756 | }; |
| 757 | |
| 758 | static int __devinit ds2781_battery_probe(struct platform_device *pdev) |
| 759 | { |
| 760 | int ret = 0; |
| 761 | struct ds2781_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 = ds2781_battery_props; |
| 776 | dev_info->bat.num_properties = ARRAY_SIZE(ds2781_battery_props); |
| 777 | dev_info->bat.get_property = ds2781_battery_get_property; |
| 778 | dev_info->mutex_holder = current; |
| 779 | |
| 780 | ret = power_supply_register(&pdev->dev, &dev_info->bat); |
| 781 | if (ret) { |
| 782 | dev_err(dev_info->dev, "failed to register battery\n"); |
| 783 | goto fail_free_info; |
| 784 | } |
| 785 | |
| 786 | ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2781_attr_group); |
| 787 | if (ret) { |
| 788 | dev_err(dev_info->dev, "failed to create sysfs group\n"); |
| 789 | goto fail_unregister; |
| 790 | } |
| 791 | |
| 792 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, |
| 793 | &ds2781_param_eeprom_bin_attr); |
| 794 | if (ret) { |
| 795 | dev_err(dev_info->dev, |
| 796 | "failed to create param eeprom bin file"); |
| 797 | goto fail_remove_group; |
| 798 | } |
| 799 | |
| 800 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, |
| 801 | &ds2781_user_eeprom_bin_attr); |
| 802 | if (ret) { |
| 803 | dev_err(dev_info->dev, |
| 804 | "failed to create user eeprom bin file"); |
| 805 | goto fail_remove_bin_file; |
| 806 | } |
| 807 | |
| 808 | dev_info->mutex_holder = NULL; |
| 809 | |
| 810 | return 0; |
| 811 | |
| 812 | fail_remove_bin_file: |
| 813 | sysfs_remove_bin_file(&dev_info->bat.dev->kobj, |
| 814 | &ds2781_param_eeprom_bin_attr); |
| 815 | fail_remove_group: |
| 816 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group); |
| 817 | fail_unregister: |
| 818 | power_supply_unregister(&dev_info->bat); |
| 819 | fail_free_info: |
| 820 | kfree(dev_info); |
| 821 | fail: |
| 822 | return ret; |
| 823 | } |
| 824 | |
| 825 | static int __devexit ds2781_battery_remove(struct platform_device *pdev) |
| 826 | { |
| 827 | struct ds2781_device_info *dev_info = platform_get_drvdata(pdev); |
| 828 | |
| 829 | dev_info->mutex_holder = current; |
| 830 | |
| 831 | /* remove attributes */ |
| 832 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group); |
| 833 | |
| 834 | power_supply_unregister(&dev_info->bat); |
| 835 | |
| 836 | kfree(dev_info); |
| 837 | return 0; |
| 838 | } |
| 839 | |
| 840 | static struct platform_driver ds2781_battery_driver = { |
| 841 | .driver = { |
| 842 | .name = "ds2781-battery", |
| 843 | }, |
| 844 | .probe = ds2781_battery_probe, |
| 845 | .remove = __devexit_p(ds2781_battery_remove), |
| 846 | }; |
| 847 | |
| 848 | static int __init ds2781_battery_init(void) |
| 849 | { |
| 850 | return platform_driver_register(&ds2781_battery_driver); |
| 851 | } |
| 852 | |
| 853 | static void __exit ds2781_battery_exit(void) |
| 854 | { |
| 855 | platform_driver_unregister(&ds2781_battery_driver); |
| 856 | } |
| 857 | |
| 858 | module_init(ds2781_battery_init); |
| 859 | module_exit(ds2781_battery_exit); |
| 860 | |
| 861 | |
| 862 | MODULE_LICENSE("GPL"); |
| 863 | MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>"); |
| 864 | MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver"); |
| 865 | MODULE_ALIAS("platform:ds2781-battery"); |
| 866 | |