Krzysztof Kozlowski | 87c2d90 | 2015-01-20 11:00:54 +0100 | [diff] [blame] | 1 | /* |
| 2 | * max77693_charger.c - Battery charger driver for the Maxim 77693 |
| 3 | * |
| 4 | * Copyright (C) 2014 Samsung Electronics |
| 5 | * Krzysztof Kozlowski <k.kozlowski@samsung.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/power_supply.h> |
| 21 | #include <linux/regmap.h> |
| 22 | #include <linux/mfd/max77693.h> |
| 23 | #include <linux/mfd/max77693-private.h> |
| 24 | |
| 25 | static const char *max77693_charger_name = "max77693-charger"; |
| 26 | static const char *max77693_charger_model = "MAX77693"; |
| 27 | static const char *max77693_charger_manufacturer = "Maxim Integrated"; |
| 28 | |
| 29 | struct max77693_charger { |
| 30 | struct device *dev; |
| 31 | struct max77693_dev *max77693; |
| 32 | struct power_supply charger; |
| 33 | |
| 34 | u32 constant_volt; |
| 35 | u32 min_system_volt; |
| 36 | u32 thermal_regulation_temp; |
| 37 | u32 batttery_overcurrent; |
| 38 | u32 charge_input_threshold_volt; |
| 39 | }; |
| 40 | |
| 41 | static int max77693_get_charger_state(struct regmap *regmap) |
| 42 | { |
| 43 | int state; |
| 44 | unsigned int data; |
| 45 | |
| 46 | if (regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data) < 0) |
| 47 | return POWER_SUPPLY_STATUS_UNKNOWN; |
| 48 | |
| 49 | data &= CHG_DETAILS_01_CHG_MASK; |
| 50 | data >>= CHG_DETAILS_01_CHG_SHIFT; |
| 51 | |
| 52 | switch (data) { |
| 53 | case MAX77693_CHARGING_PREQUALIFICATION: |
| 54 | case MAX77693_CHARGING_FAST_CONST_CURRENT: |
| 55 | case MAX77693_CHARGING_FAST_CONST_VOLTAGE: |
| 56 | case MAX77693_CHARGING_TOP_OFF: |
| 57 | /* In high temp the charging current is reduced, but still charging */ |
| 58 | case MAX77693_CHARGING_HIGH_TEMP: |
| 59 | state = POWER_SUPPLY_STATUS_CHARGING; |
| 60 | break; |
| 61 | case MAX77693_CHARGING_DONE: |
| 62 | state = POWER_SUPPLY_STATUS_FULL; |
| 63 | break; |
| 64 | case MAX77693_CHARGING_TIMER_EXPIRED: |
| 65 | case MAX77693_CHARGING_THERMISTOR_SUSPEND: |
| 66 | state = POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 67 | break; |
| 68 | case MAX77693_CHARGING_OFF: |
| 69 | case MAX77693_CHARGING_OVER_TEMP: |
| 70 | case MAX77693_CHARGING_WATCHDOG_EXPIRED: |
| 71 | state = POWER_SUPPLY_STATUS_DISCHARGING; |
| 72 | break; |
| 73 | case MAX77693_CHARGING_RESERVED: |
| 74 | default: |
| 75 | state = POWER_SUPPLY_STATUS_UNKNOWN; |
| 76 | } |
| 77 | |
| 78 | return state; |
| 79 | } |
| 80 | |
| 81 | static int max77693_get_charge_type(struct regmap *regmap) |
| 82 | { |
| 83 | int state; |
| 84 | unsigned int data; |
| 85 | |
| 86 | if (regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data) < 0) |
| 87 | return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; |
| 88 | |
| 89 | data &= CHG_DETAILS_01_CHG_MASK; |
| 90 | data >>= CHG_DETAILS_01_CHG_SHIFT; |
| 91 | |
| 92 | switch (data) { |
| 93 | case MAX77693_CHARGING_PREQUALIFICATION: |
| 94 | /* |
| 95 | * Top-off: trickle or fast? In top-off the current varies between |
| 96 | * 100 and 250 mA. It is higher than prequalification current. |
| 97 | */ |
| 98 | case MAX77693_CHARGING_TOP_OFF: |
| 99 | state = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; |
| 100 | break; |
| 101 | case MAX77693_CHARGING_FAST_CONST_CURRENT: |
| 102 | case MAX77693_CHARGING_FAST_CONST_VOLTAGE: |
| 103 | /* In high temp the charging current is reduced, but still charging */ |
| 104 | case MAX77693_CHARGING_HIGH_TEMP: |
| 105 | state = POWER_SUPPLY_CHARGE_TYPE_FAST; |
| 106 | break; |
| 107 | case MAX77693_CHARGING_DONE: |
| 108 | case MAX77693_CHARGING_TIMER_EXPIRED: |
| 109 | case MAX77693_CHARGING_THERMISTOR_SUSPEND: |
| 110 | case MAX77693_CHARGING_OFF: |
| 111 | case MAX77693_CHARGING_OVER_TEMP: |
| 112 | case MAX77693_CHARGING_WATCHDOG_EXPIRED: |
| 113 | state = POWER_SUPPLY_CHARGE_TYPE_NONE; |
| 114 | break; |
| 115 | case MAX77693_CHARGING_RESERVED: |
| 116 | default: |
| 117 | state = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; |
| 118 | } |
| 119 | |
| 120 | return state; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Supported health statuses: |
| 125 | * - POWER_SUPPLY_HEALTH_DEAD |
| 126 | * - POWER_SUPPLY_HEALTH_GOOD |
| 127 | * - POWER_SUPPLY_HEALTH_OVERVOLTAGE |
| 128 | * - POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE |
| 129 | * - POWER_SUPPLY_HEALTH_UNKNOWN |
| 130 | * - POWER_SUPPLY_HEALTH_UNSPEC_FAILURE |
| 131 | */ |
| 132 | static int max77693_get_battery_health(struct regmap *regmap) |
| 133 | { |
| 134 | int state; |
| 135 | unsigned int data; |
| 136 | |
| 137 | if (regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data) < 0) |
| 138 | return POWER_SUPPLY_HEALTH_UNKNOWN; |
| 139 | |
| 140 | data &= CHG_DETAILS_01_BAT_MASK; |
| 141 | data >>= CHG_DETAILS_01_BAT_SHIFT; |
| 142 | |
| 143 | switch (data) { |
| 144 | case MAX77693_BATTERY_NOBAT: |
| 145 | state = POWER_SUPPLY_HEALTH_DEAD; |
| 146 | break; |
| 147 | case MAX77693_BATTERY_PREQUALIFICATION: |
| 148 | case MAX77693_BATTERY_GOOD: |
| 149 | case MAX77693_BATTERY_LOWVOLTAGE: |
| 150 | state = POWER_SUPPLY_HEALTH_GOOD; |
| 151 | break; |
| 152 | case MAX77693_BATTERY_TIMER_EXPIRED: |
| 153 | /* |
| 154 | * Took longer to charge than expected, charging suspended. |
| 155 | * Damaged battery? |
| 156 | */ |
| 157 | state = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; |
| 158 | break; |
| 159 | case MAX77693_BATTERY_OVERVOLTAGE: |
| 160 | state = POWER_SUPPLY_HEALTH_OVERVOLTAGE; |
| 161 | break; |
| 162 | case MAX77693_BATTERY_OVERCURRENT: |
| 163 | state = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
| 164 | break; |
| 165 | case MAX77693_BATTERY_RESERVED: |
| 166 | default: |
| 167 | state = POWER_SUPPLY_HEALTH_UNKNOWN; |
| 168 | break; |
| 169 | } |
| 170 | |
| 171 | return state; |
| 172 | } |
| 173 | |
| 174 | static int max77693_get_present(struct regmap *regmap) |
| 175 | { |
| 176 | unsigned int data; |
| 177 | |
| 178 | /* |
| 179 | * Read CHG_INT_OK register. High DETBAT bit here should be |
| 180 | * equal to value 0x0 in CHG_DETAILS_01/BAT field. |
| 181 | */ |
| 182 | regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); |
| 183 | if (data & CHG_INT_OK_DETBAT_MASK) |
| 184 | return 0; |
| 185 | return 1; |
| 186 | } |
| 187 | |
| 188 | static int max77693_get_online(struct regmap *regmap) |
| 189 | { |
| 190 | unsigned int data; |
| 191 | |
| 192 | regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); |
| 193 | if (data & CHG_INT_OK_CHGIN_MASK) |
| 194 | return 1; |
| 195 | return 0; |
| 196 | } |
| 197 | |
| 198 | static enum power_supply_property max77693_charger_props[] = { |
| 199 | POWER_SUPPLY_PROP_STATUS, |
| 200 | POWER_SUPPLY_PROP_CHARGE_TYPE, |
| 201 | POWER_SUPPLY_PROP_HEALTH, |
| 202 | POWER_SUPPLY_PROP_PRESENT, |
| 203 | POWER_SUPPLY_PROP_ONLINE, |
| 204 | POWER_SUPPLY_PROP_MODEL_NAME, |
| 205 | POWER_SUPPLY_PROP_MANUFACTURER, |
| 206 | }; |
| 207 | |
| 208 | static int max77693_charger_get_property(struct power_supply *psy, |
| 209 | enum power_supply_property psp, |
| 210 | union power_supply_propval *val) |
| 211 | { |
| 212 | struct max77693_charger *chg = container_of(psy, |
| 213 | struct max77693_charger, |
| 214 | charger); |
| 215 | struct regmap *regmap = chg->max77693->regmap; |
| 216 | int ret = 0; |
| 217 | |
| 218 | switch (psp) { |
| 219 | case POWER_SUPPLY_PROP_STATUS: |
| 220 | val->intval = max77693_get_charger_state(regmap); |
| 221 | break; |
| 222 | case POWER_SUPPLY_PROP_CHARGE_TYPE: |
| 223 | val->intval = max77693_get_charge_type(regmap); |
| 224 | break; |
| 225 | case POWER_SUPPLY_PROP_HEALTH: |
| 226 | val->intval = max77693_get_battery_health(regmap); |
| 227 | break; |
| 228 | case POWER_SUPPLY_PROP_PRESENT: |
| 229 | val->intval = max77693_get_present(regmap); |
| 230 | break; |
| 231 | case POWER_SUPPLY_PROP_ONLINE: |
| 232 | val->intval = max77693_get_online(regmap); |
| 233 | break; |
| 234 | case POWER_SUPPLY_PROP_MODEL_NAME: |
| 235 | val->strval = max77693_charger_model; |
| 236 | break; |
| 237 | case POWER_SUPPLY_PROP_MANUFACTURER: |
| 238 | val->strval = max77693_charger_manufacturer; |
| 239 | break; |
| 240 | default: |
| 241 | return -EINVAL; |
| 242 | } |
| 243 | |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | static ssize_t device_attr_store(struct device *dev, |
| 248 | struct device_attribute *attr, const char *buf, size_t count, |
| 249 | int (*fn)(struct max77693_charger *, unsigned long)) |
| 250 | { |
| 251 | struct max77693_charger *chg = dev_get_drvdata(dev); |
| 252 | unsigned long val; |
| 253 | int ret; |
| 254 | |
| 255 | ret = kstrtoul(buf, 10, &val); |
| 256 | if (ret) |
| 257 | return ret; |
| 258 | |
| 259 | ret = fn(chg, val); |
| 260 | if (ret) |
| 261 | return ret; |
| 262 | |
| 263 | return count; |
| 264 | } |
| 265 | |
| 266 | static ssize_t fast_charge_timer_show(struct device *dev, |
| 267 | struct device_attribute *attr, char *buf) |
| 268 | { |
| 269 | struct max77693_charger *chg = dev_get_drvdata(dev); |
| 270 | unsigned int data, val; |
| 271 | int ret; |
| 272 | |
| 273 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_01, |
| 274 | &data); |
| 275 | if (ret < 0) |
| 276 | return ret; |
| 277 | |
| 278 | data &= CHG_CNFG_01_FCHGTIME_MASK; |
| 279 | data >>= CHG_CNFG_01_FCHGTIME_SHIFT; |
| 280 | switch (data) { |
| 281 | case 0x1 ... 0x7: |
| 282 | /* Starting from 4 hours, step by 2 hours */ |
| 283 | val = 4 + (data - 1) * 2; |
| 284 | break; |
| 285 | case 0x0: |
| 286 | default: |
| 287 | val = 0; |
| 288 | break; |
| 289 | } |
| 290 | |
| 291 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); |
| 292 | } |
| 293 | |
| 294 | static int max77693_set_fast_charge_timer(struct max77693_charger *chg, |
| 295 | unsigned long hours) |
| 296 | { |
| 297 | unsigned int data; |
| 298 | |
| 299 | /* |
| 300 | * 0x00 - disable |
| 301 | * 0x01 - 4h |
| 302 | * 0x02 - 6h |
| 303 | * ... |
| 304 | * 0x07 - 16h |
| 305 | * Round down odd values. |
| 306 | */ |
| 307 | switch (hours) { |
| 308 | case 4 ... 16: |
| 309 | data = (hours - 4) / 2 + 1; |
| 310 | break; |
| 311 | case 0: |
| 312 | /* Disable */ |
| 313 | data = 0; |
| 314 | break; |
| 315 | default: |
| 316 | return -EINVAL; |
| 317 | } |
| 318 | data <<= CHG_CNFG_01_FCHGTIME_SHIFT; |
| 319 | |
| 320 | return regmap_update_bits(chg->max77693->regmap, |
| 321 | MAX77693_CHG_REG_CHG_CNFG_01, |
| 322 | CHG_CNFG_01_FCHGTIME_MASK, data); |
| 323 | } |
| 324 | |
| 325 | static ssize_t fast_charge_timer_store(struct device *dev, |
| 326 | struct device_attribute *attr, const char *buf, size_t count) |
| 327 | { |
| 328 | return device_attr_store(dev, attr, buf, count, |
| 329 | max77693_set_fast_charge_timer); |
| 330 | } |
| 331 | |
| 332 | static ssize_t top_off_threshold_current_show(struct device *dev, |
| 333 | struct device_attribute *attr, char *buf) |
| 334 | { |
| 335 | struct max77693_charger *chg = dev_get_drvdata(dev); |
| 336 | unsigned int data, val; |
| 337 | int ret; |
| 338 | |
| 339 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, |
| 340 | &data); |
| 341 | if (ret < 0) |
| 342 | return ret; |
| 343 | |
| 344 | data &= CHG_CNFG_03_TOITH_MASK; |
| 345 | data >>= CHG_CNFG_03_TOITH_SHIFT; |
| 346 | |
| 347 | if (data <= 0x04) |
| 348 | val = 100000 + data * 25000; |
| 349 | else |
| 350 | val = data * 50000; |
| 351 | |
| 352 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); |
| 353 | } |
| 354 | |
| 355 | static int max77693_set_top_off_threshold_current(struct max77693_charger *chg, |
| 356 | unsigned long uamp) |
| 357 | { |
| 358 | unsigned int data; |
| 359 | |
| 360 | if (uamp < 100000 || uamp > 350000) |
| 361 | return -EINVAL; |
| 362 | |
| 363 | if (uamp <= 200000) |
| 364 | data = (uamp - 100000) / 25000; |
| 365 | else |
| 366 | /* (200000, 350000> */ |
| 367 | data = uamp / 50000; |
| 368 | |
| 369 | data <<= CHG_CNFG_03_TOITH_SHIFT; |
| 370 | |
| 371 | return regmap_update_bits(chg->max77693->regmap, |
| 372 | MAX77693_CHG_REG_CHG_CNFG_03, |
| 373 | CHG_CNFG_03_TOITH_MASK, data); |
| 374 | } |
| 375 | |
| 376 | static ssize_t top_off_threshold_current_store(struct device *dev, |
| 377 | struct device_attribute *attr, const char *buf, size_t count) |
| 378 | { |
| 379 | return device_attr_store(dev, attr, buf, count, |
| 380 | max77693_set_top_off_threshold_current); |
| 381 | } |
| 382 | |
| 383 | static ssize_t top_off_timer_show(struct device *dev, |
| 384 | struct device_attribute *attr, char *buf) |
| 385 | { |
| 386 | struct max77693_charger *chg = dev_get_drvdata(dev); |
| 387 | unsigned int data, val; |
| 388 | int ret; |
| 389 | |
| 390 | ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, |
| 391 | &data); |
| 392 | if (ret < 0) |
| 393 | return ret; |
| 394 | |
| 395 | data &= CHG_CNFG_03_TOTIME_MASK; |
| 396 | data >>= CHG_CNFG_03_TOTIME_SHIFT; |
| 397 | |
| 398 | val = data * 10; |
| 399 | |
| 400 | return scnprintf(buf, PAGE_SIZE, "%u\n", val); |
| 401 | } |
| 402 | |
| 403 | static int max77693_set_top_off_timer(struct max77693_charger *chg, |
| 404 | unsigned long minutes) |
| 405 | { |
| 406 | unsigned int data; |
| 407 | |
| 408 | if (minutes > 70) |
| 409 | return -EINVAL; |
| 410 | |
| 411 | data = minutes / 10; |
| 412 | data <<= CHG_CNFG_03_TOTIME_SHIFT; |
| 413 | |
| 414 | return regmap_update_bits(chg->max77693->regmap, |
| 415 | MAX77693_CHG_REG_CHG_CNFG_03, |
| 416 | CHG_CNFG_03_TOTIME_MASK, data); |
| 417 | } |
| 418 | |
| 419 | static ssize_t top_off_timer_store(struct device *dev, |
| 420 | struct device_attribute *attr, const char *buf, size_t count) |
| 421 | { |
| 422 | return device_attr_store(dev, attr, buf, count, |
| 423 | max77693_set_top_off_timer); |
| 424 | } |
| 425 | |
| 426 | static DEVICE_ATTR_RW(fast_charge_timer); |
| 427 | static DEVICE_ATTR_RW(top_off_threshold_current); |
| 428 | static DEVICE_ATTR_RW(top_off_timer); |
| 429 | |
| 430 | static int max77693_set_constant_volt(struct max77693_charger *chg, |
| 431 | unsigned int uvolt) |
| 432 | { |
| 433 | unsigned int data; |
| 434 | |
| 435 | /* |
| 436 | * 0x00 - 3.650 V |
| 437 | * 0x01 - 3.675 V |
| 438 | * ... |
| 439 | * 0x1b - 4.325 V |
| 440 | * 0x1c - 4.340 V |
| 441 | * 0x1d - 4.350 V |
| 442 | * 0x1e - 4.375 V |
| 443 | * 0x1f - 4.400 V |
| 444 | */ |
| 445 | if (uvolt >= 3650000 && uvolt < 4340000) |
| 446 | data = (uvolt - 3650000) / 25000; |
| 447 | else if (uvolt >= 4340000 && uvolt < 4350000) |
| 448 | data = 0x1c; |
| 449 | else if (uvolt >= 4350000 && uvolt <= 4400000) |
| 450 | data = 0x1d + (uvolt - 4350000) / 25000; |
| 451 | else { |
| 452 | dev_err(chg->dev, "Wrong value for charging constant voltage\n"); |
| 453 | return -EINVAL; |
| 454 | } |
| 455 | |
| 456 | data <<= CHG_CNFG_04_CHGCVPRM_SHIFT; |
| 457 | |
| 458 | dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt, |
| 459 | data); |
| 460 | |
| 461 | return regmap_update_bits(chg->max77693->regmap, |
| 462 | MAX77693_CHG_REG_CHG_CNFG_04, |
| 463 | CHG_CNFG_04_CHGCVPRM_MASK, data); |
| 464 | } |
| 465 | |
| 466 | static int max77693_set_min_system_volt(struct max77693_charger *chg, |
| 467 | unsigned int uvolt) |
| 468 | { |
| 469 | unsigned int data; |
| 470 | |
| 471 | if (uvolt < 3000000 || uvolt > 3700000) { |
| 472 | dev_err(chg->dev, "Wrong value for minimum system regulation voltage\n"); |
| 473 | return -EINVAL; |
| 474 | } |
| 475 | |
| 476 | data = (uvolt - 3000000) / 100000; |
| 477 | |
| 478 | data <<= CHG_CNFG_04_MINVSYS_SHIFT; |
| 479 | |
| 480 | dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n", |
| 481 | uvolt, data); |
| 482 | |
| 483 | return regmap_update_bits(chg->max77693->regmap, |
| 484 | MAX77693_CHG_REG_CHG_CNFG_04, |
| 485 | CHG_CNFG_04_MINVSYS_MASK, data); |
| 486 | } |
| 487 | |
| 488 | static int max77693_set_thermal_regulation_temp(struct max77693_charger *chg, |
| 489 | unsigned int cels) |
| 490 | { |
| 491 | unsigned int data; |
| 492 | |
| 493 | switch (cels) { |
| 494 | case 70: |
| 495 | case 85: |
| 496 | case 100: |
| 497 | case 115: |
| 498 | data = (cels - 70) / 15; |
| 499 | break; |
| 500 | default: |
| 501 | dev_err(chg->dev, "Wrong value for thermal regulation loop temperature\n"); |
| 502 | return -EINVAL; |
| 503 | } |
| 504 | |
| 505 | data <<= CHG_CNFG_07_REGTEMP_SHIFT; |
| 506 | |
| 507 | dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n", |
| 508 | cels, data); |
| 509 | |
| 510 | return regmap_update_bits(chg->max77693->regmap, |
| 511 | MAX77693_CHG_REG_CHG_CNFG_07, |
| 512 | CHG_CNFG_07_REGTEMP_MASK, data); |
| 513 | } |
| 514 | |
| 515 | static int max77693_set_batttery_overcurrent(struct max77693_charger *chg, |
| 516 | unsigned int uamp) |
| 517 | { |
| 518 | unsigned int data; |
| 519 | |
| 520 | if (uamp && (uamp < 2000000 || uamp > 3500000)) { |
| 521 | dev_err(chg->dev, "Wrong value for battery overcurrent\n"); |
| 522 | return -EINVAL; |
| 523 | } |
| 524 | |
| 525 | if (uamp) |
| 526 | data = ((uamp - 2000000) / 250000) + 1; |
| 527 | else |
| 528 | data = 0; /* disable */ |
| 529 | |
| 530 | data <<= CHG_CNFG_12_B2SOVRC_SHIFT; |
| 531 | |
| 532 | dev_dbg(chg->dev, "Battery overcurrent: %u (0x%x)\n", uamp, data); |
| 533 | |
| 534 | return regmap_update_bits(chg->max77693->regmap, |
| 535 | MAX77693_CHG_REG_CHG_CNFG_12, |
| 536 | CHG_CNFG_12_B2SOVRC_MASK, data); |
| 537 | } |
| 538 | |
| 539 | static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg, |
| 540 | unsigned int uvolt) |
| 541 | { |
| 542 | unsigned int data; |
| 543 | |
| 544 | switch (uvolt) { |
| 545 | case 4300000: |
| 546 | data = 0x0; |
| 547 | break; |
| 548 | case 4700000: |
| 549 | case 4800000: |
| 550 | case 4900000: |
| 551 | data = (uvolt - 4700000) / 100000; |
| 552 | default: |
| 553 | dev_err(chg->dev, "Wrong value for charge input voltage regulation threshold\n"); |
| 554 | return -EINVAL; |
| 555 | } |
| 556 | |
| 557 | data <<= CHG_CNFG_12_VCHGINREG_SHIFT; |
| 558 | |
| 559 | dev_dbg(chg->dev, "Charge input voltage regulation threshold: %u (0x%x)\n", |
| 560 | uvolt, data); |
| 561 | |
| 562 | return regmap_update_bits(chg->max77693->regmap, |
| 563 | MAX77693_CHG_REG_CHG_CNFG_12, |
| 564 | CHG_CNFG_12_VCHGINREG_MASK, data); |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * Sets charger registers to proper and safe default values. |
| 569 | */ |
| 570 | static int max77693_reg_init(struct max77693_charger *chg) |
| 571 | { |
| 572 | int ret; |
| 573 | unsigned int data; |
| 574 | |
| 575 | /* Unlock charger register protection */ |
| 576 | data = (0x3 << CHG_CNFG_06_CHGPROT_SHIFT); |
| 577 | ret = regmap_update_bits(chg->max77693->regmap, |
| 578 | MAX77693_CHG_REG_CHG_CNFG_06, |
| 579 | CHG_CNFG_06_CHGPROT_MASK, data); |
| 580 | if (ret) { |
| 581 | dev_err(chg->dev, "Error unlocking registers: %d\n", ret); |
| 582 | return ret; |
| 583 | } |
| 584 | |
| 585 | ret = max77693_set_fast_charge_timer(chg, DEFAULT_FAST_CHARGE_TIMER); |
| 586 | if (ret) |
| 587 | return ret; |
| 588 | |
| 589 | ret = max77693_set_top_off_threshold_current(chg, |
| 590 | DEFAULT_TOP_OFF_THRESHOLD_CURRENT); |
| 591 | if (ret) |
| 592 | return ret; |
| 593 | |
| 594 | ret = max77693_set_top_off_timer(chg, DEFAULT_TOP_OFF_TIMER); |
| 595 | if (ret) |
| 596 | return ret; |
| 597 | |
| 598 | ret = max77693_set_constant_volt(chg, chg->constant_volt); |
| 599 | if (ret) |
| 600 | return ret; |
| 601 | |
| 602 | ret = max77693_set_min_system_volt(chg, chg->min_system_volt); |
| 603 | if (ret) |
| 604 | return ret; |
| 605 | |
| 606 | ret = max77693_set_thermal_regulation_temp(chg, |
| 607 | chg->thermal_regulation_temp); |
| 608 | if (ret) |
| 609 | return ret; |
| 610 | |
| 611 | ret = max77693_set_batttery_overcurrent(chg, chg->batttery_overcurrent); |
| 612 | if (ret) |
| 613 | return ret; |
| 614 | |
kbuild test robot | 5b40b3e | 2015-01-21 12:11:34 +0800 | [diff] [blame] | 615 | return max77693_set_charge_input_threshold_volt(chg, |
Krzysztof Kozlowski | 87c2d90 | 2015-01-20 11:00:54 +0100 | [diff] [blame] | 616 | chg->charge_input_threshold_volt); |
Krzysztof Kozlowski | 87c2d90 | 2015-01-20 11:00:54 +0100 | [diff] [blame] | 617 | } |
| 618 | |
| 619 | #ifdef CONFIG_OF |
| 620 | static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) |
| 621 | { |
| 622 | struct device_node *np = dev->of_node; |
| 623 | |
| 624 | if (!np) { |
| 625 | dev_err(dev, "no charger OF node\n"); |
| 626 | return -EINVAL; |
| 627 | } |
| 628 | |
| 629 | if (of_property_read_u32(np, "maxim,constant-microvolt", |
| 630 | &chg->constant_volt)) |
| 631 | chg->constant_volt = DEFAULT_CONSTANT_VOLT; |
| 632 | |
| 633 | if (of_property_read_u32(np, "maxim,min-system-microvolt", |
| 634 | &chg->min_system_volt)) |
| 635 | chg->min_system_volt = DEFAULT_MIN_SYSTEM_VOLT; |
| 636 | |
| 637 | if (of_property_read_u32(np, "maxim,thermal-regulation-celsius", |
| 638 | &chg->thermal_regulation_temp)) |
| 639 | chg->thermal_regulation_temp = DEFAULT_THERMAL_REGULATION_TEMP; |
| 640 | |
| 641 | if (of_property_read_u32(np, "maxim,battery-overcurrent-microamp", |
| 642 | &chg->batttery_overcurrent)) |
| 643 | chg->batttery_overcurrent = DEFAULT_BATTERY_OVERCURRENT; |
| 644 | |
| 645 | if (of_property_read_u32(np, "maxim,charge-input-threshold-microvolt", |
| 646 | &chg->charge_input_threshold_volt)) |
| 647 | chg->charge_input_threshold_volt = |
| 648 | DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT; |
| 649 | |
| 650 | return 0; |
| 651 | } |
| 652 | #else /* CONFIG_OF */ |
| 653 | static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) |
| 654 | { |
| 655 | return 0; |
| 656 | } |
| 657 | #endif /* CONFIG_OF */ |
| 658 | |
| 659 | static int max77693_charger_probe(struct platform_device *pdev) |
| 660 | { |
| 661 | struct max77693_charger *chg; |
| 662 | struct max77693_dev *max77693 = dev_get_drvdata(pdev->dev.parent); |
| 663 | int ret; |
| 664 | |
| 665 | chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL); |
| 666 | if (!chg) |
| 667 | return -ENOMEM; |
| 668 | |
| 669 | platform_set_drvdata(pdev, chg); |
| 670 | chg->dev = &pdev->dev; |
| 671 | chg->max77693 = max77693; |
| 672 | |
| 673 | ret = max77693_dt_init(&pdev->dev, chg); |
| 674 | if (ret) |
| 675 | return ret; |
| 676 | |
| 677 | ret = max77693_reg_init(chg); |
| 678 | if (ret) |
| 679 | return ret; |
| 680 | |
| 681 | chg->charger.name = max77693_charger_name; |
| 682 | chg->charger.type = POWER_SUPPLY_TYPE_BATTERY; |
| 683 | chg->charger.properties = max77693_charger_props; |
| 684 | chg->charger.num_properties = ARRAY_SIZE(max77693_charger_props); |
| 685 | chg->charger.get_property = max77693_charger_get_property; |
| 686 | |
| 687 | ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer); |
| 688 | if (ret) { |
| 689 | dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n"); |
| 690 | goto err; |
| 691 | } |
| 692 | |
| 693 | ret = device_create_file(&pdev->dev, |
| 694 | &dev_attr_top_off_threshold_current); |
| 695 | if (ret) { |
| 696 | dev_err(&pdev->dev, "failed: create top off current sysfs entry\n"); |
| 697 | goto err; |
| 698 | } |
| 699 | |
| 700 | ret = device_create_file(&pdev->dev, &dev_attr_top_off_timer); |
| 701 | if (ret) { |
| 702 | dev_err(&pdev->dev, "failed: create top off timer sysfs entry\n"); |
| 703 | goto err; |
| 704 | } |
| 705 | |
| 706 | ret = power_supply_register(&pdev->dev, &chg->charger); |
| 707 | if (ret) { |
| 708 | dev_err(&pdev->dev, "failed: power supply register\n"); |
| 709 | goto err; |
| 710 | } |
| 711 | |
| 712 | return 0; |
| 713 | |
| 714 | err: |
| 715 | device_remove_file(&pdev->dev, &dev_attr_top_off_timer); |
| 716 | device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); |
| 717 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); |
| 718 | |
| 719 | return ret; |
| 720 | } |
| 721 | |
| 722 | static int max77693_charger_remove(struct platform_device *pdev) |
| 723 | { |
| 724 | struct max77693_charger *chg = platform_get_drvdata(pdev); |
| 725 | |
| 726 | device_remove_file(&pdev->dev, &dev_attr_top_off_timer); |
| 727 | device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); |
| 728 | device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); |
| 729 | |
| 730 | power_supply_unregister(&chg->charger); |
| 731 | |
| 732 | return 0; |
| 733 | } |
| 734 | |
| 735 | static const struct platform_device_id max77693_charger_id[] = { |
| 736 | { "max77693-charger", 0, }, |
| 737 | { } |
| 738 | }; |
| 739 | MODULE_DEVICE_TABLE(platform, max77693_charger_id); |
| 740 | |
| 741 | static struct platform_driver max77693_charger_driver = { |
| 742 | .driver = { |
Krzysztof Kozlowski | 87c2d90 | 2015-01-20 11:00:54 +0100 | [diff] [blame] | 743 | .name = "max77693-charger", |
| 744 | }, |
| 745 | .probe = max77693_charger_probe, |
| 746 | .remove = max77693_charger_remove, |
| 747 | .id_table = max77693_charger_id, |
| 748 | }; |
| 749 | module_platform_driver(max77693_charger_driver); |
| 750 | |
| 751 | MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); |
| 752 | MODULE_DESCRIPTION("Maxim 77693 charger driver"); |
| 753 | MODULE_LICENSE("GPL"); |