Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 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; |
Clifton Barnes | 0e053fc | 2011-11-02 13:39:55 -0700 | [diff] [blame] | 42 | struct task_struct *mutex_holder; |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 43 | }; |
| 44 | |
| 45 | enum current_types { |
| 46 | CURRENT_NOW, |
| 47 | CURRENT_AVG, |
| 48 | }; |
| 49 | |
| 50 | static const char model[] = "DS2780"; |
| 51 | static const char manufacturer[] = "Maxim/Dallas"; |
| 52 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 53 | static inline struct ds2780_device_info * |
| 54 | to_ds2780_device_info(struct power_supply *psy) |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 55 | { |
| 56 | return container_of(psy, struct ds2780_device_info, bat); |
| 57 | } |
| 58 | |
| 59 | static inline struct power_supply *to_power_supply(struct device *dev) |
| 60 | { |
| 61 | return dev_get_drvdata(dev); |
| 62 | } |
| 63 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 64 | static inline int ds2780_battery_io(struct ds2780_device_info *dev_info, |
| 65 | char *buf, int addr, size_t count, int io) |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 66 | { |
Clifton Barnes | 0e053fc | 2011-11-02 13:39:55 -0700 | [diff] [blame] | 67 | if (dev_info->mutex_holder == current) |
| 68 | return w1_ds2780_io_nolock(dev_info->w1_dev, buf, addr, count, io); |
| 69 | else |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 70 | return w1_ds2780_io(dev_info->w1_dev, buf, addr, count, io); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 71 | } |
| 72 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 73 | static inline int ds2780_read8(struct ds2780_device_info *dev_info, u8 *val, |
| 74 | int addr) |
| 75 | { |
| 76 | return ds2780_battery_io(dev_info, val, addr, sizeof(u8), 0); |
| 77 | } |
| 78 | |
| 79 | static int ds2780_read16(struct ds2780_device_info *dev_info, s16 *val, |
| 80 | int addr) |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 81 | { |
| 82 | int ret; |
| 83 | u8 raw[2]; |
| 84 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 85 | ret = ds2780_battery_io(dev_info, raw, addr, sizeof(raw), 0); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 86 | if (ret < 0) |
| 87 | return ret; |
| 88 | |
| 89 | *val = (raw[0] << 8) | raw[1]; |
| 90 | |
| 91 | return 0; |
| 92 | } |
| 93 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 94 | static inline int ds2780_read_block(struct ds2780_device_info *dev_info, |
| 95 | u8 *val, int addr, size_t count) |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 96 | { |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 97 | return ds2780_battery_io(dev_info, val, addr, count, 0); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 100 | static inline int ds2780_write(struct ds2780_device_info *dev_info, u8 *val, |
| 101 | int addr, size_t count) |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 102 | { |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 103 | return ds2780_battery_io(dev_info, val, addr, count, 1); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | static inline int ds2780_store_eeprom(struct device *dev, int addr) |
| 107 | { |
| 108 | return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_COPY_DATA); |
| 109 | } |
| 110 | |
| 111 | static inline int ds2780_recall_eeprom(struct device *dev, int addr) |
| 112 | { |
| 113 | return w1_ds2780_eeprom_cmd(dev, addr, W1_DS2780_RECALL_DATA); |
| 114 | } |
| 115 | |
| 116 | static int ds2780_save_eeprom(struct ds2780_device_info *dev_info, int reg) |
| 117 | { |
| 118 | int ret; |
| 119 | |
| 120 | ret = ds2780_store_eeprom(dev_info->w1_dev, reg); |
| 121 | if (ret < 0) |
| 122 | return ret; |
| 123 | |
| 124 | ret = ds2780_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 ds2780_set_sense_register(struct ds2780_device_info *dev_info, |
| 133 | u8 conductance) |
| 134 | { |
| 135 | int ret; |
| 136 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 137 | ret = ds2780_write(dev_info, &conductance, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 138 | DS2780_RSNSP_REG, sizeof(u8)); |
| 139 | if (ret < 0) |
| 140 | return ret; |
| 141 | |
| 142 | return ds2780_save_eeprom(dev_info, DS2780_RSNSP_REG); |
| 143 | } |
| 144 | |
| 145 | /* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */ |
| 146 | static int ds2780_get_rsgain_register(struct ds2780_device_info *dev_info, |
| 147 | u16 *rsgain) |
| 148 | { |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 149 | return ds2780_read16(dev_info, rsgain, DS2780_RSGAIN_MSB_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | /* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */ |
| 153 | static int ds2780_set_rsgain_register(struct ds2780_device_info *dev_info, |
| 154 | u16 rsgain) |
| 155 | { |
| 156 | int ret; |
| 157 | u8 raw[] = {rsgain >> 8, rsgain & 0xFF}; |
| 158 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 159 | ret = ds2780_write(dev_info, raw, |
| 160 | DS2780_RSGAIN_MSB_REG, sizeof(raw)); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 161 | if (ret < 0) |
| 162 | return ret; |
| 163 | |
| 164 | return ds2780_save_eeprom(dev_info, DS2780_RSGAIN_MSB_REG); |
| 165 | } |
| 166 | |
| 167 | static int ds2780_get_voltage(struct ds2780_device_info *dev_info, |
| 168 | int *voltage_uV) |
| 169 | { |
| 170 | int ret; |
| 171 | s16 voltage_raw; |
| 172 | |
| 173 | /* |
| 174 | * The voltage value is located in 10 bits across the voltage MSB |
| 175 | * and LSB registers in two's compliment form |
| 176 | * Sign bit of the voltage value is in bit 7 of the voltage MSB register |
| 177 | * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the |
| 178 | * voltage MSB register |
| 179 | * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the |
| 180 | * voltage LSB register |
| 181 | */ |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 182 | ret = ds2780_read16(dev_info, &voltage_raw, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 183 | DS2780_VOLT_MSB_REG); |
| 184 | if (ret < 0) |
| 185 | return ret; |
| 186 | |
| 187 | /* |
| 188 | * DS2780 reports voltage in units of 4.88mV, but the battery class |
| 189 | * reports in units of uV, so convert by multiplying by 4880. |
| 190 | */ |
| 191 | *voltage_uV = (voltage_raw / 32) * 4880; |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | static int ds2780_get_temperature(struct ds2780_device_info *dev_info, |
| 196 | int *temperature) |
| 197 | { |
| 198 | int ret; |
| 199 | s16 temperature_raw; |
| 200 | |
| 201 | /* |
| 202 | * The temperature value is located in 10 bits across the temperature |
| 203 | * MSB and LSB registers in two's compliment form |
| 204 | * Sign bit of the temperature value is in bit 7 of the temperature |
| 205 | * MSB register |
| 206 | * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the |
| 207 | * temperature MSB register |
| 208 | * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the |
| 209 | * temperature LSB register |
| 210 | */ |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 211 | ret = ds2780_read16(dev_info, &temperature_raw, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 212 | DS2780_TEMP_MSB_REG); |
| 213 | if (ret < 0) |
| 214 | return ret; |
| 215 | |
| 216 | /* |
| 217 | * Temperature is measured in units of 0.125 degrees celcius, the |
| 218 | * power_supply class measures temperature in tenths of degrees |
| 219 | * celsius. The temperature value is stored as a 10 bit number, plus |
| 220 | * sign in the upper bits of a 16 bit register. |
| 221 | */ |
| 222 | *temperature = ((temperature_raw / 32) * 125) / 100; |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static int ds2780_get_current(struct ds2780_device_info *dev_info, |
| 227 | enum current_types type, int *current_uA) |
| 228 | { |
| 229 | int ret, sense_res; |
| 230 | s16 current_raw; |
| 231 | u8 sense_res_raw, reg_msb; |
| 232 | |
| 233 | /* |
| 234 | * The units of measurement for current are dependent on the value of |
| 235 | * the sense resistor. |
| 236 | */ |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 237 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 238 | if (ret < 0) |
| 239 | return ret; |
| 240 | |
| 241 | if (sense_res_raw == 0) { |
| 242 | dev_err(dev_info->dev, "sense resistor value is 0\n"); |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 243 | return -EINVAL; |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 244 | } |
| 245 | sense_res = 1000 / sense_res_raw; |
| 246 | |
| 247 | if (type == CURRENT_NOW) |
| 248 | reg_msb = DS2780_CURRENT_MSB_REG; |
| 249 | else if (type == CURRENT_AVG) |
| 250 | reg_msb = DS2780_IAVG_MSB_REG; |
| 251 | else |
| 252 | return -EINVAL; |
| 253 | |
| 254 | /* |
| 255 | * The current value is located in 16 bits across the current MSB |
| 256 | * and LSB registers in two's compliment form |
| 257 | * Sign bit of the current value is in bit 7 of the current MSB register |
| 258 | * Bits 14 - 8 of the current value are in bits 6 - 0 of the current |
| 259 | * MSB register |
| 260 | * Bits 7 - 0 of the current value are in bits 7 - 0 of the current |
| 261 | * LSB register |
| 262 | */ |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 263 | ret = ds2780_read16(dev_info, ¤t_raw, reg_msb); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 264 | if (ret < 0) |
| 265 | return ret; |
| 266 | |
| 267 | *current_uA = current_raw * (DS2780_CURRENT_UNITS / sense_res); |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | static int ds2780_get_accumulated_current(struct ds2780_device_info *dev_info, |
| 272 | int *accumulated_current) |
| 273 | { |
| 274 | int ret, sense_res; |
| 275 | s16 current_raw; |
| 276 | u8 sense_res_raw; |
| 277 | |
| 278 | /* |
| 279 | * The units of measurement for accumulated current are dependent on |
| 280 | * the value of the sense resistor. |
| 281 | */ |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 282 | ret = ds2780_read8(dev_info, &sense_res_raw, DS2780_RSNSP_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 283 | if (ret < 0) |
| 284 | return ret; |
| 285 | |
| 286 | if (sense_res_raw == 0) { |
| 287 | dev_err(dev_info->dev, "sense resistor value is 0\n"); |
| 288 | return -ENXIO; |
| 289 | } |
| 290 | sense_res = 1000 / sense_res_raw; |
| 291 | |
| 292 | /* |
| 293 | * The ACR value is located in 16 bits across the ACR MSB and |
| 294 | * LSB registers |
| 295 | * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR |
| 296 | * MSB register |
| 297 | * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR |
| 298 | * LSB register |
| 299 | */ |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 300 | ret = ds2780_read16(dev_info, ¤t_raw, DS2780_ACR_MSB_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 301 | if (ret < 0) |
| 302 | return ret; |
| 303 | |
| 304 | *accumulated_current = current_raw * (DS2780_CHARGE_UNITS / sense_res); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static int ds2780_get_capacity(struct ds2780_device_info *dev_info, |
| 309 | int *capacity) |
| 310 | { |
| 311 | int ret; |
| 312 | u8 raw; |
| 313 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 314 | ret = ds2780_read8(dev_info, &raw, DS2780_RARC_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 315 | if (ret < 0) |
| 316 | return ret; |
| 317 | |
| 318 | *capacity = raw; |
| 319 | return raw; |
| 320 | } |
| 321 | |
| 322 | static int ds2780_get_status(struct ds2780_device_info *dev_info, int *status) |
| 323 | { |
| 324 | int ret, current_uA, capacity; |
| 325 | |
| 326 | ret = ds2780_get_current(dev_info, CURRENT_NOW, ¤t_uA); |
| 327 | if (ret < 0) |
| 328 | return ret; |
| 329 | |
| 330 | ret = ds2780_get_capacity(dev_info, &capacity); |
| 331 | if (ret < 0) |
| 332 | return ret; |
| 333 | |
| 334 | if (capacity == 100) |
| 335 | *status = POWER_SUPPLY_STATUS_FULL; |
| 336 | else if (current_uA == 0) |
| 337 | *status = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 338 | else if (current_uA < 0) |
| 339 | *status = POWER_SUPPLY_STATUS_DISCHARGING; |
| 340 | else |
| 341 | *status = POWER_SUPPLY_STATUS_CHARGING; |
| 342 | |
| 343 | return 0; |
| 344 | } |
| 345 | |
| 346 | static int ds2780_get_charge_now(struct ds2780_device_info *dev_info, |
| 347 | int *charge_now) |
| 348 | { |
| 349 | int ret; |
| 350 | u16 charge_raw; |
| 351 | |
| 352 | /* |
| 353 | * The RAAC value is located in 16 bits across the RAAC MSB and |
| 354 | * LSB registers |
| 355 | * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC |
| 356 | * MSB register |
| 357 | * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC |
| 358 | * LSB register |
| 359 | */ |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 360 | ret = ds2780_read16(dev_info, &charge_raw, DS2780_RAAC_MSB_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 361 | if (ret < 0) |
| 362 | return ret; |
| 363 | |
| 364 | *charge_now = charge_raw * 1600; |
| 365 | return 0; |
| 366 | } |
| 367 | |
| 368 | static int ds2780_get_control_register(struct ds2780_device_info *dev_info, |
| 369 | u8 *control_reg) |
| 370 | { |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 371 | return ds2780_read8(dev_info, control_reg, DS2780_CONTROL_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | static int ds2780_set_control_register(struct ds2780_device_info *dev_info, |
| 375 | u8 control_reg) |
| 376 | { |
| 377 | int ret; |
| 378 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 379 | ret = ds2780_write(dev_info, &control_reg, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 380 | DS2780_CONTROL_REG, sizeof(u8)); |
| 381 | if (ret < 0) |
| 382 | return ret; |
| 383 | |
| 384 | return ds2780_save_eeprom(dev_info, DS2780_CONTROL_REG); |
| 385 | } |
| 386 | |
| 387 | static int ds2780_battery_get_property(struct power_supply *psy, |
| 388 | enum power_supply_property psp, |
| 389 | union power_supply_propval *val) |
| 390 | { |
| 391 | int ret = 0; |
| 392 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 393 | |
| 394 | switch (psp) { |
| 395 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| 396 | ret = ds2780_get_voltage(dev_info, &val->intval); |
| 397 | break; |
| 398 | |
| 399 | case POWER_SUPPLY_PROP_TEMP: |
| 400 | ret = ds2780_get_temperature(dev_info, &val->intval); |
| 401 | break; |
| 402 | |
| 403 | case POWER_SUPPLY_PROP_MODEL_NAME: |
| 404 | val->strval = model; |
| 405 | break; |
| 406 | |
| 407 | case POWER_SUPPLY_PROP_MANUFACTURER: |
| 408 | val->strval = manufacturer; |
| 409 | break; |
| 410 | |
| 411 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
| 412 | ret = ds2780_get_current(dev_info, CURRENT_NOW, &val->intval); |
| 413 | break; |
| 414 | |
| 415 | case POWER_SUPPLY_PROP_CURRENT_AVG: |
| 416 | ret = ds2780_get_current(dev_info, CURRENT_AVG, &val->intval); |
| 417 | break; |
| 418 | |
| 419 | case POWER_SUPPLY_PROP_STATUS: |
| 420 | ret = ds2780_get_status(dev_info, &val->intval); |
| 421 | break; |
| 422 | |
| 423 | case POWER_SUPPLY_PROP_CAPACITY: |
| 424 | ret = ds2780_get_capacity(dev_info, &val->intval); |
| 425 | break; |
| 426 | |
| 427 | case POWER_SUPPLY_PROP_CHARGE_COUNTER: |
| 428 | ret = ds2780_get_accumulated_current(dev_info, &val->intval); |
| 429 | break; |
| 430 | |
| 431 | case POWER_SUPPLY_PROP_CHARGE_NOW: |
| 432 | ret = ds2780_get_charge_now(dev_info, &val->intval); |
| 433 | break; |
| 434 | |
| 435 | default: |
| 436 | ret = -EINVAL; |
| 437 | } |
| 438 | |
| 439 | return ret; |
| 440 | } |
| 441 | |
| 442 | static enum power_supply_property ds2780_battery_props[] = { |
| 443 | POWER_SUPPLY_PROP_STATUS, |
| 444 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 445 | POWER_SUPPLY_PROP_TEMP, |
| 446 | POWER_SUPPLY_PROP_MODEL_NAME, |
| 447 | POWER_SUPPLY_PROP_MANUFACTURER, |
| 448 | POWER_SUPPLY_PROP_CURRENT_NOW, |
| 449 | POWER_SUPPLY_PROP_CURRENT_AVG, |
| 450 | POWER_SUPPLY_PROP_CAPACITY, |
| 451 | POWER_SUPPLY_PROP_CHARGE_COUNTER, |
| 452 | POWER_SUPPLY_PROP_CHARGE_NOW, |
| 453 | }; |
| 454 | |
| 455 | static ssize_t ds2780_get_pmod_enabled(struct device *dev, |
| 456 | struct device_attribute *attr, |
| 457 | char *buf) |
| 458 | { |
| 459 | int ret; |
| 460 | u8 control_reg; |
| 461 | struct power_supply *psy = to_power_supply(dev); |
| 462 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 463 | |
| 464 | /* Get power mode */ |
| 465 | ret = ds2780_get_control_register(dev_info, &control_reg); |
| 466 | if (ret < 0) |
| 467 | return ret; |
| 468 | |
| 469 | return sprintf(buf, "%d\n", |
| 470 | !!(control_reg & DS2780_CONTROL_REG_PMOD)); |
| 471 | } |
| 472 | |
| 473 | static ssize_t ds2780_set_pmod_enabled(struct device *dev, |
| 474 | struct device_attribute *attr, |
| 475 | const char *buf, |
| 476 | size_t count) |
| 477 | { |
| 478 | int ret; |
| 479 | u8 control_reg, new_setting; |
| 480 | struct power_supply *psy = to_power_supply(dev); |
| 481 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 482 | |
| 483 | /* Set power mode */ |
| 484 | ret = ds2780_get_control_register(dev_info, &control_reg); |
| 485 | if (ret < 0) |
| 486 | return ret; |
| 487 | |
| 488 | ret = kstrtou8(buf, 0, &new_setting); |
| 489 | if (ret < 0) |
| 490 | return ret; |
| 491 | |
| 492 | if ((new_setting != 0) && (new_setting != 1)) { |
| 493 | dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n"); |
| 494 | return -EINVAL; |
| 495 | } |
| 496 | |
| 497 | if (new_setting) |
| 498 | control_reg |= DS2780_CONTROL_REG_PMOD; |
| 499 | else |
| 500 | control_reg &= ~DS2780_CONTROL_REG_PMOD; |
| 501 | |
| 502 | ret = ds2780_set_control_register(dev_info, control_reg); |
| 503 | if (ret < 0) |
| 504 | return ret; |
| 505 | |
| 506 | return count; |
| 507 | } |
| 508 | |
| 509 | static ssize_t ds2780_get_sense_resistor_value(struct device *dev, |
| 510 | struct device_attribute *attr, |
| 511 | char *buf) |
| 512 | { |
| 513 | int ret; |
| 514 | u8 sense_resistor; |
| 515 | struct power_supply *psy = to_power_supply(dev); |
| 516 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 517 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 518 | ret = ds2780_read8(dev_info, &sense_resistor, DS2780_RSNSP_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 519 | if (ret < 0) |
| 520 | return ret; |
| 521 | |
| 522 | ret = sprintf(buf, "%d\n", sense_resistor); |
| 523 | return ret; |
| 524 | } |
| 525 | |
| 526 | static ssize_t ds2780_set_sense_resistor_value(struct device *dev, |
| 527 | struct device_attribute *attr, |
| 528 | const char *buf, |
| 529 | size_t count) |
| 530 | { |
| 531 | int ret; |
| 532 | u8 new_setting; |
| 533 | struct power_supply *psy = to_power_supply(dev); |
| 534 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 535 | |
| 536 | ret = kstrtou8(buf, 0, &new_setting); |
| 537 | if (ret < 0) |
| 538 | return ret; |
| 539 | |
| 540 | ret = ds2780_set_sense_register(dev_info, new_setting); |
| 541 | if (ret < 0) |
| 542 | return ret; |
| 543 | |
| 544 | return count; |
| 545 | } |
| 546 | |
| 547 | static ssize_t ds2780_get_rsgain_setting(struct device *dev, |
| 548 | struct device_attribute *attr, |
| 549 | char *buf) |
| 550 | { |
| 551 | int ret; |
| 552 | u16 rsgain; |
| 553 | struct power_supply *psy = to_power_supply(dev); |
| 554 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 555 | |
| 556 | ret = ds2780_get_rsgain_register(dev_info, &rsgain); |
| 557 | if (ret < 0) |
| 558 | return ret; |
| 559 | |
| 560 | return sprintf(buf, "%d\n", rsgain); |
| 561 | } |
| 562 | |
| 563 | static ssize_t ds2780_set_rsgain_setting(struct device *dev, |
| 564 | struct device_attribute *attr, |
| 565 | const char *buf, |
| 566 | size_t count) |
| 567 | { |
| 568 | int ret; |
| 569 | u16 new_setting; |
| 570 | struct power_supply *psy = to_power_supply(dev); |
| 571 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 572 | |
| 573 | ret = kstrtou16(buf, 0, &new_setting); |
| 574 | if (ret < 0) |
| 575 | return ret; |
| 576 | |
| 577 | /* Gain can only be from 0 to 1.999 in steps of .001 */ |
| 578 | if (new_setting > 1999) { |
| 579 | dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n"); |
| 580 | return -EINVAL; |
| 581 | } |
| 582 | |
| 583 | ret = ds2780_set_rsgain_register(dev_info, new_setting); |
| 584 | if (ret < 0) |
| 585 | return ret; |
| 586 | |
| 587 | return count; |
| 588 | } |
| 589 | |
| 590 | static ssize_t ds2780_get_pio_pin(struct device *dev, |
| 591 | struct device_attribute *attr, |
| 592 | char *buf) |
| 593 | { |
| 594 | int ret; |
| 595 | u8 sfr; |
| 596 | struct power_supply *psy = to_power_supply(dev); |
| 597 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 598 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 599 | ret = ds2780_read8(dev_info, &sfr, DS2780_SFR_REG); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 600 | if (ret < 0) |
| 601 | return ret; |
| 602 | |
| 603 | ret = sprintf(buf, "%d\n", sfr & DS2780_SFR_REG_PIOSC); |
| 604 | return ret; |
| 605 | } |
| 606 | |
| 607 | static ssize_t ds2780_set_pio_pin(struct device *dev, |
| 608 | struct device_attribute *attr, |
| 609 | const char *buf, |
| 610 | size_t count) |
| 611 | { |
| 612 | int ret; |
| 613 | u8 new_setting; |
| 614 | struct power_supply *psy = to_power_supply(dev); |
| 615 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 616 | |
| 617 | ret = kstrtou8(buf, 0, &new_setting); |
| 618 | if (ret < 0) |
| 619 | return ret; |
| 620 | |
| 621 | if ((new_setting != 0) && (new_setting != 1)) { |
| 622 | dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n"); |
| 623 | return -EINVAL; |
| 624 | } |
| 625 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 626 | ret = ds2780_write(dev_info, &new_setting, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 627 | DS2780_SFR_REG, sizeof(u8)); |
| 628 | if (ret < 0) |
| 629 | return ret; |
| 630 | |
| 631 | return count; |
| 632 | } |
| 633 | |
| 634 | static ssize_t ds2780_read_param_eeprom_bin(struct file *filp, |
| 635 | struct kobject *kobj, |
| 636 | struct bin_attribute *bin_attr, |
| 637 | char *buf, loff_t off, size_t count) |
| 638 | { |
| 639 | struct device *dev = container_of(kobj, struct device, kobj); |
| 640 | struct power_supply *psy = to_power_supply(dev); |
| 641 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 642 | |
| 643 | count = min_t(loff_t, count, |
| 644 | DS2780_EEPROM_BLOCK1_END - |
| 645 | DS2780_EEPROM_BLOCK1_START + 1 - off); |
| 646 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 647 | return ds2780_read_block(dev_info, buf, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 648 | DS2780_EEPROM_BLOCK1_START + off, count); |
| 649 | } |
| 650 | |
| 651 | static ssize_t ds2780_write_param_eeprom_bin(struct file *filp, |
| 652 | struct kobject *kobj, |
| 653 | struct bin_attribute *bin_attr, |
| 654 | char *buf, loff_t off, size_t count) |
| 655 | { |
| 656 | struct device *dev = container_of(kobj, struct device, kobj); |
| 657 | struct power_supply *psy = to_power_supply(dev); |
| 658 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 659 | int ret; |
| 660 | |
| 661 | count = min_t(loff_t, count, |
| 662 | DS2780_EEPROM_BLOCK1_END - |
| 663 | DS2780_EEPROM_BLOCK1_START + 1 - off); |
| 664 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 665 | ret = ds2780_write(dev_info, buf, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 666 | DS2780_EEPROM_BLOCK1_START + off, count); |
| 667 | if (ret < 0) |
| 668 | return ret; |
| 669 | |
| 670 | ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK1_START); |
| 671 | if (ret < 0) |
| 672 | return ret; |
| 673 | |
| 674 | return count; |
| 675 | } |
| 676 | |
| 677 | static struct bin_attribute ds2780_param_eeprom_bin_attr = { |
| 678 | .attr = { |
| 679 | .name = "param_eeprom", |
| 680 | .mode = S_IRUGO | S_IWUSR, |
| 681 | }, |
| 682 | .size = DS2780_EEPROM_BLOCK1_END - DS2780_EEPROM_BLOCK1_START + 1, |
| 683 | .read = ds2780_read_param_eeprom_bin, |
| 684 | .write = ds2780_write_param_eeprom_bin, |
| 685 | }; |
| 686 | |
| 687 | static ssize_t ds2780_read_user_eeprom_bin(struct file *filp, |
| 688 | struct kobject *kobj, |
| 689 | struct bin_attribute *bin_attr, |
| 690 | char *buf, loff_t off, size_t count) |
| 691 | { |
| 692 | struct device *dev = container_of(kobj, struct device, kobj); |
| 693 | struct power_supply *psy = to_power_supply(dev); |
| 694 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 695 | |
| 696 | count = min_t(loff_t, count, |
| 697 | DS2780_EEPROM_BLOCK0_END - |
| 698 | DS2780_EEPROM_BLOCK0_START + 1 - off); |
| 699 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 700 | return ds2780_read_block(dev_info, buf, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 701 | DS2780_EEPROM_BLOCK0_START + off, count); |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 702 | } |
| 703 | |
| 704 | static ssize_t ds2780_write_user_eeprom_bin(struct file *filp, |
| 705 | struct kobject *kobj, |
| 706 | struct bin_attribute *bin_attr, |
| 707 | char *buf, loff_t off, size_t count) |
| 708 | { |
| 709 | struct device *dev = container_of(kobj, struct device, kobj); |
| 710 | struct power_supply *psy = to_power_supply(dev); |
| 711 | struct ds2780_device_info *dev_info = to_ds2780_device_info(psy); |
| 712 | int ret; |
| 713 | |
| 714 | count = min_t(loff_t, count, |
| 715 | DS2780_EEPROM_BLOCK0_END - |
| 716 | DS2780_EEPROM_BLOCK0_START + 1 - off); |
| 717 | |
Clifton Barnes | 853eee7 | 2011-11-02 13:39:50 -0700 | [diff] [blame] | 718 | ret = ds2780_write(dev_info, buf, |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 719 | DS2780_EEPROM_BLOCK0_START + off, count); |
| 720 | if (ret < 0) |
| 721 | return ret; |
| 722 | |
| 723 | ret = ds2780_save_eeprom(dev_info, DS2780_EEPROM_BLOCK0_START); |
| 724 | if (ret < 0) |
| 725 | return ret; |
| 726 | |
| 727 | return count; |
| 728 | } |
| 729 | |
| 730 | static struct bin_attribute ds2780_user_eeprom_bin_attr = { |
| 731 | .attr = { |
| 732 | .name = "user_eeprom", |
| 733 | .mode = S_IRUGO | S_IWUSR, |
| 734 | }, |
| 735 | .size = DS2780_EEPROM_BLOCK0_END - DS2780_EEPROM_BLOCK0_START + 1, |
| 736 | .read = ds2780_read_user_eeprom_bin, |
| 737 | .write = ds2780_write_user_eeprom_bin, |
| 738 | }; |
| 739 | |
| 740 | static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2780_get_pmod_enabled, |
| 741 | ds2780_set_pmod_enabled); |
| 742 | static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR, |
| 743 | ds2780_get_sense_resistor_value, ds2780_set_sense_resistor_value); |
| 744 | static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2780_get_rsgain_setting, |
| 745 | ds2780_set_rsgain_setting); |
| 746 | static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2780_get_pio_pin, |
| 747 | ds2780_set_pio_pin); |
| 748 | |
| 749 | |
| 750 | static struct attribute *ds2780_attributes[] = { |
| 751 | &dev_attr_pmod_enabled.attr, |
| 752 | &dev_attr_sense_resistor_value.attr, |
| 753 | &dev_attr_rsgain_setting.attr, |
| 754 | &dev_attr_pio_pin.attr, |
| 755 | NULL |
| 756 | }; |
| 757 | |
| 758 | static const struct attribute_group ds2780_attr_group = { |
| 759 | .attrs = ds2780_attributes, |
| 760 | }; |
| 761 | |
| 762 | static int __devinit ds2780_battery_probe(struct platform_device *pdev) |
| 763 | { |
| 764 | int ret = 0; |
| 765 | struct ds2780_device_info *dev_info; |
| 766 | |
| 767 | dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL); |
| 768 | if (!dev_info) { |
| 769 | ret = -ENOMEM; |
| 770 | goto fail; |
| 771 | } |
| 772 | |
| 773 | platform_set_drvdata(pdev, dev_info); |
| 774 | |
| 775 | dev_info->dev = &pdev->dev; |
| 776 | dev_info->w1_dev = pdev->dev.parent; |
| 777 | dev_info->bat.name = dev_name(&pdev->dev); |
| 778 | dev_info->bat.type = POWER_SUPPLY_TYPE_BATTERY; |
| 779 | dev_info->bat.properties = ds2780_battery_props; |
| 780 | dev_info->bat.num_properties = ARRAY_SIZE(ds2780_battery_props); |
| 781 | dev_info->bat.get_property = ds2780_battery_get_property; |
Clifton Barnes | 0e053fc | 2011-11-02 13:39:55 -0700 | [diff] [blame] | 782 | dev_info->mutex_holder = current; |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 783 | |
| 784 | ret = power_supply_register(&pdev->dev, &dev_info->bat); |
| 785 | if (ret) { |
| 786 | dev_err(dev_info->dev, "failed to register battery\n"); |
| 787 | goto fail_free_info; |
| 788 | } |
| 789 | |
| 790 | ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); |
| 791 | if (ret) { |
| 792 | dev_err(dev_info->dev, "failed to create sysfs group\n"); |
| 793 | goto fail_unregister; |
| 794 | } |
| 795 | |
| 796 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, |
| 797 | &ds2780_param_eeprom_bin_attr); |
| 798 | if (ret) { |
| 799 | dev_err(dev_info->dev, |
| 800 | "failed to create param eeprom bin file"); |
| 801 | goto fail_remove_group; |
| 802 | } |
| 803 | |
| 804 | ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj, |
| 805 | &ds2780_user_eeprom_bin_attr); |
| 806 | if (ret) { |
| 807 | dev_err(dev_info->dev, |
| 808 | "failed to create user eeprom bin file"); |
| 809 | goto fail_remove_bin_file; |
| 810 | } |
| 811 | |
Clifton Barnes | 0e053fc | 2011-11-02 13:39:55 -0700 | [diff] [blame] | 812 | dev_info->mutex_holder = NULL; |
| 813 | |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 814 | return 0; |
| 815 | |
| 816 | fail_remove_bin_file: |
| 817 | sysfs_remove_bin_file(&dev_info->bat.dev->kobj, |
| 818 | &ds2780_param_eeprom_bin_attr); |
| 819 | fail_remove_group: |
| 820 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); |
| 821 | fail_unregister: |
| 822 | power_supply_unregister(&dev_info->bat); |
| 823 | fail_free_info: |
| 824 | kfree(dev_info); |
| 825 | fail: |
| 826 | return ret; |
| 827 | } |
| 828 | |
| 829 | static int __devexit ds2780_battery_remove(struct platform_device *pdev) |
| 830 | { |
| 831 | struct ds2780_device_info *dev_info = platform_get_drvdata(pdev); |
| 832 | |
Clifton Barnes | 0e053fc | 2011-11-02 13:39:55 -0700 | [diff] [blame] | 833 | dev_info->mutex_holder = current; |
| 834 | |
Clifton Barnes | 275ac74 | 2011-05-26 16:26:04 -0700 | [diff] [blame] | 835 | /* remove attributes */ |
| 836 | sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2780_attr_group); |
| 837 | |
| 838 | power_supply_unregister(&dev_info->bat); |
| 839 | |
| 840 | kfree(dev_info); |
| 841 | return 0; |
| 842 | } |
| 843 | |
| 844 | MODULE_ALIAS("platform:ds2780-battery"); |
| 845 | |
| 846 | static struct platform_driver ds2780_battery_driver = { |
| 847 | .driver = { |
| 848 | .name = "ds2780-battery", |
| 849 | }, |
| 850 | .probe = ds2780_battery_probe, |
| 851 | .remove = ds2780_battery_remove, |
| 852 | }; |
| 853 | |
| 854 | static int __init ds2780_battery_init(void) |
| 855 | { |
| 856 | return platform_driver_register(&ds2780_battery_driver); |
| 857 | } |
| 858 | |
| 859 | static void __exit ds2780_battery_exit(void) |
| 860 | { |
| 861 | platform_driver_unregister(&ds2780_battery_driver); |
| 862 | } |
| 863 | |
| 864 | module_init(ds2780_battery_init); |
| 865 | module_exit(ds2780_battery_exit); |
| 866 | |
| 867 | MODULE_LICENSE("GPL"); |
| 868 | MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); |
| 869 | MODULE_DESCRIPTION("Maxim/Dallas DS2780 Stand-Alone Fuel Gauage IC driver"); |