Mike Looijmans | cd900f1 | 2021-01-07 15:32:48 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Driver for Analog Devices (Linear Technology) LTC4162-L charger IC. |
| 4 | * Copyright (C) 2020, Topic Embedded Products |
| 5 | */ |
| 6 | |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/delay.h> |
| 9 | #include <linux/of_device.h> |
| 10 | #include <linux/pm_runtime.h> |
| 11 | #include <linux/power_supply.h> |
| 12 | #include <linux/i2c.h> |
| 13 | #include <linux/regmap.h> |
| 14 | |
| 15 | /* Registers (names based on what datasheet uses) */ |
| 16 | #define LTC4162L_EN_LIMIT_ALERTS_REG 0x0D |
| 17 | #define LTC4162L_EN_CHARGER_STATE_ALERTS_REG 0x0E |
| 18 | #define LTC4162L_EN_CHARGE_STATUS_ALERTS_REG 0x0F |
| 19 | #define LTC4162L_CONFIG_BITS_REG 0x14 |
| 20 | #define LTC4162L_IIN_LIMIT_TARGET 0x15 |
| 21 | #define LTC4162L_ARM_SHIP_MODE 0x19 |
| 22 | #define LTC4162L_CHARGE_CURRENT_SETTING 0X1A |
| 23 | #define LTC4162L_VCHARGE_SETTING 0X1B |
| 24 | #define LTC4162L_C_OVER_X_THRESHOLD 0x1C |
| 25 | #define LTC4162L_MAX_CV_TIME 0X1D |
| 26 | #define LTC4162L_MAX_CHARGE_TIME 0X1E |
| 27 | #define LTC4162L_CHARGER_CONFIG_BITS 0x29 |
| 28 | #define LTC4162L_CHARGER_STATE 0x34 |
| 29 | #define LTC4162L_CHARGE_STATUS 0x35 |
| 30 | #define LTC4162L_LIMIT_ALERTS_REG 0x36 |
| 31 | #define LTC4162L_CHARGER_STATE_ALERTS_REG 0x37 |
| 32 | #define LTC4162L_CHARGE_STATUS_ALERTS_REG 0x38 |
| 33 | #define LTC4162L_SYSTEM_STATUS_REG 0x39 |
| 34 | #define LTC4162L_VBAT 0x3A |
| 35 | #define LTC4162L_VIN 0x3B |
| 36 | #define LTC4162L_VOUT 0x3C |
| 37 | #define LTC4162L_IBAT 0x3D |
| 38 | #define LTC4162L_IIN 0x3E |
| 39 | #define LTC4162L_DIE_TEMPERATURE 0x3F |
| 40 | #define LTC4162L_THERMISTOR_VOLTAGE 0x40 |
| 41 | #define LTC4162L_BSR 0x41 |
| 42 | #define LTC4162L_JEITA_REGION 0x42 |
| 43 | #define LTC4162L_CHEM_CELLS_REG 0x43 |
| 44 | #define LTC4162L_ICHARGE_DAC 0x44 |
| 45 | #define LTC4162L_VCHARGE_DAC 0x45 |
| 46 | #define LTC4162L_IIN_LIMIT_DAC 0x46 |
| 47 | #define LTC4162L_VBAT_FILT 0x47 |
| 48 | #define LTC4162L_INPUT_UNDERVOLTAGE_DAC 0x4B |
| 49 | |
| 50 | /* Enumeration as in datasheet. Individual bits are mutually exclusive. */ |
| 51 | enum ltc4162l_state { |
| 52 | battery_detection = 2048, |
| 53 | charger_suspended = 256, |
| 54 | precharge = 128, /* trickle on low bat voltage */ |
| 55 | cc_cv_charge = 64, /* normal charge */ |
| 56 | ntc_pause = 32, |
| 57 | timer_term = 16, |
| 58 | c_over_x_term = 8, /* battery is full */ |
| 59 | max_charge_time_fault = 4, |
| 60 | bat_missing_fault = 2, |
| 61 | bat_short_fault = 1 |
| 62 | }; |
| 63 | |
| 64 | /* Individual bits are mutually exclusive. Only active in charging states.*/ |
| 65 | enum ltc4162l_charge_status { |
| 66 | ilim_reg_active = 32, |
| 67 | thermal_reg_active = 16, |
| 68 | vin_uvcl_active = 8, |
| 69 | iin_limit_active = 4, |
| 70 | constant_current = 2, |
| 71 | constant_voltage = 1, |
| 72 | charger_off = 0 |
| 73 | }; |
| 74 | |
| 75 | /* Magic number to write to ARM_SHIP_MODE register */ |
| 76 | #define LTC4162L_ARM_SHIP_MODE_MAGIC 21325 |
| 77 | |
| 78 | struct ltc4162l_info { |
| 79 | struct i2c_client *client; |
| 80 | struct regmap *regmap; |
| 81 | struct power_supply *charger; |
| 82 | u32 rsnsb; /* Series resistor that sets charge current, microOhm */ |
| 83 | u32 rsnsi; /* Series resistor to measure input current, microOhm */ |
| 84 | u8 cell_count; /* Number of connected cells, 0 while unknown */ |
| 85 | }; |
| 86 | |
| 87 | static u8 ltc4162l_get_cell_count(struct ltc4162l_info *info) |
| 88 | { |
| 89 | int ret; |
| 90 | unsigned int val; |
| 91 | |
| 92 | /* Once read successfully */ |
| 93 | if (info->cell_count) |
| 94 | return info->cell_count; |
| 95 | |
| 96 | ret = regmap_read(info->regmap, LTC4162L_CHEM_CELLS_REG, &val); |
| 97 | if (ret) |
| 98 | return 0; |
| 99 | |
| 100 | /* Lower 4 bits is the cell count, or 0 if the chip doesn't know yet */ |
| 101 | val &= 0x0f; |
| 102 | if (!val) |
| 103 | return 0; |
| 104 | |
| 105 | /* Once determined, keep the value */ |
| 106 | info->cell_count = val; |
| 107 | |
| 108 | return val; |
| 109 | }; |
| 110 | |
| 111 | /* Convert enum value to POWER_SUPPLY_STATUS value */ |
| 112 | static int ltc4162l_state_decode(enum ltc4162l_state value) |
| 113 | { |
| 114 | switch (value) { |
| 115 | case precharge: |
| 116 | case cc_cv_charge: |
| 117 | return POWER_SUPPLY_STATUS_CHARGING; |
| 118 | case c_over_x_term: |
| 119 | return POWER_SUPPLY_STATUS_FULL; |
| 120 | case bat_missing_fault: |
| 121 | case bat_short_fault: |
| 122 | return POWER_SUPPLY_STATUS_UNKNOWN; |
| 123 | default: |
| 124 | return POWER_SUPPLY_STATUS_NOT_CHARGING; |
| 125 | } |
| 126 | }; |
| 127 | |
| 128 | static int ltc4162l_get_status(struct ltc4162l_info *info, |
| 129 | union power_supply_propval *val) |
| 130 | { |
| 131 | unsigned int regval; |
| 132 | int ret; |
| 133 | |
| 134 | ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val); |
| 135 | if (ret) { |
| 136 | dev_err(&info->client->dev, "Failed to read CHARGER_STATE\n"); |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 140 | val->intval = ltc4162l_state_decode(regval); |
| 141 | |
| 142 | return 0; |
| 143 | } |
| 144 | |
| 145 | static int ltc4162l_charge_status_decode(enum ltc4162l_charge_status value) |
| 146 | { |
| 147 | if (!value) |
| 148 | return POWER_SUPPLY_CHARGE_TYPE_NONE; |
| 149 | |
| 150 | /* constant voltage/current and input_current limit are "fast" modes */ |
| 151 | if (value <= iin_limit_active) |
| 152 | return POWER_SUPPLY_CHARGE_TYPE_FAST; |
| 153 | |
| 154 | /* Anything that's not fast we'll return as trickle */ |
| 155 | return POWER_SUPPLY_CHARGE_TYPE_TRICKLE; |
| 156 | } |
| 157 | |
| 158 | static int ltc4162l_get_charge_type(struct ltc4162l_info *info, |
| 159 | union power_supply_propval *val) |
| 160 | { |
| 161 | unsigned int regval; |
| 162 | int ret; |
| 163 | |
| 164 | ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val); |
| 165 | if (ret) |
| 166 | return ret; |
| 167 | |
| 168 | val->intval = ltc4162l_charge_status_decode(regval); |
| 169 | |
| 170 | return 0; |
| 171 | } |
| 172 | |
| 173 | static int ltc4162l_state_to_health(enum ltc4162l_state value) |
| 174 | { |
| 175 | switch (value) { |
| 176 | case ntc_pause: |
| 177 | return POWER_SUPPLY_HEALTH_OVERHEAT; |
| 178 | case timer_term: |
| 179 | return POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; |
| 180 | case max_charge_time_fault: |
| 181 | return POWER_SUPPLY_HEALTH_WATCHDOG_TIMER_EXPIRE; |
| 182 | case bat_missing_fault: |
| 183 | return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; |
| 184 | case bat_short_fault: |
| 185 | return POWER_SUPPLY_HEALTH_DEAD; |
| 186 | default: |
| 187 | return POWER_SUPPLY_HEALTH_GOOD; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | static int ltc4162l_get_health(struct ltc4162l_info *info, |
| 192 | union power_supply_propval *val) |
| 193 | { |
| 194 | unsigned int regval; |
| 195 | int ret; |
| 196 | |
| 197 | ret = regmap_read(info->regmap, LTC4162L_CHARGER_STATE, ®val); |
| 198 | if (ret) |
| 199 | return ret; |
| 200 | |
| 201 | val->intval = ltc4162l_state_to_health(regval); |
| 202 | |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static int ltc4162l_get_online(struct ltc4162l_info *info, |
| 207 | union power_supply_propval *val) |
| 208 | { |
| 209 | unsigned int regval; |
| 210 | int ret; |
| 211 | |
| 212 | ret = regmap_read(info->regmap, LTC4162L_SYSTEM_STATUS_REG, ®val); |
| 213 | if (ret) |
| 214 | return ret; |
| 215 | |
| 216 | /* BIT(2) indicates if input voltage is sufficient to charge */ |
| 217 | val->intval = !!(regval & BIT(2)); |
| 218 | |
| 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | static int ltc4162l_get_vbat(struct ltc4162l_info *info, |
| 223 | unsigned int reg, |
| 224 | union power_supply_propval *val) |
| 225 | { |
| 226 | unsigned int regval; |
| 227 | int ret; |
| 228 | |
| 229 | ret = regmap_read(info->regmap, reg, ®val); |
| 230 | if (ret) |
| 231 | return ret; |
| 232 | |
| 233 | /* cell_count × 192.4μV/LSB */ |
| 234 | regval *= 1924; |
| 235 | regval *= ltc4162l_get_cell_count(info); |
| 236 | regval /= 10; |
| 237 | val->intval = regval; |
| 238 | |
| 239 | return 0; |
| 240 | } |
| 241 | |
| 242 | static int ltc4162l_get_ibat(struct ltc4162l_info *info, |
| 243 | union power_supply_propval *val) |
| 244 | { |
| 245 | unsigned int regval; |
| 246 | int ret; |
| 247 | |
| 248 | ret = regmap_read(info->regmap, LTC4162L_IBAT, ®val); |
| 249 | if (ret) |
| 250 | return ret; |
| 251 | |
| 252 | /* Signed 16-bit number, 1.466μV / RSNSB amperes/LSB. */ |
| 253 | ret = (s16)(regval & 0xFFFF); |
| 254 | val->intval = 100 * mult_frac(ret, 14660, (int)info->rsnsb); |
| 255 | |
| 256 | return 0; |
| 257 | } |
| 258 | |
| 259 | |
| 260 | static int ltc4162l_get_input_voltage(struct ltc4162l_info *info, |
| 261 | union power_supply_propval *val) |
| 262 | { |
| 263 | unsigned int regval; |
| 264 | int ret; |
| 265 | |
| 266 | ret = regmap_read(info->regmap, LTC4162L_VIN, ®val); |
| 267 | if (ret) |
| 268 | return ret; |
| 269 | |
| 270 | /* 1.649mV/LSB */ |
| 271 | val->intval = regval * 1694; |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | static int ltc4162l_get_input_current(struct ltc4162l_info *info, |
| 277 | union power_supply_propval *val) |
| 278 | { |
| 279 | unsigned int regval; |
| 280 | int ret; |
| 281 | |
| 282 | ret = regmap_read(info->regmap, LTC4162L_IIN, ®val); |
| 283 | if (ret) |
| 284 | return ret; |
| 285 | |
| 286 | /* Signed 16-bit number, 1.466μV / RSNSI amperes/LSB. */ |
| 287 | ret = (s16)(regval & 0xFFFF); |
| 288 | ret *= 14660; |
| 289 | ret /= info->rsnsi; |
| 290 | ret *= 100; |
| 291 | |
| 292 | val->intval = ret; |
| 293 | |
| 294 | return 0; |
| 295 | } |
| 296 | |
| 297 | static int ltc4162l_get_icharge(struct ltc4162l_info *info, |
| 298 | unsigned int reg, |
| 299 | union power_supply_propval *val) |
| 300 | { |
| 301 | unsigned int regval; |
| 302 | int ret; |
| 303 | |
| 304 | ret = regmap_read(info->regmap, reg, ®val); |
| 305 | if (ret) |
| 306 | return ret; |
| 307 | |
| 308 | regval &= BIT(6) - 1; /* Only the lower 5 bits */ |
| 309 | |
| 310 | /* The charge current servo level: (icharge_dac + 1) × 1mV/RSNSB */ |
| 311 | ++regval; |
| 312 | val->intval = 10000u * mult_frac(regval, 100000u, info->rsnsb); |
| 313 | |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | static int ltc4162l_set_icharge(struct ltc4162l_info *info, |
| 318 | unsigned int reg, |
| 319 | unsigned int value) |
| 320 | { |
| 321 | value = mult_frac(value, info->rsnsb, 100000u); |
| 322 | value /= 10000u; |
| 323 | |
| 324 | /* Round to lowest possible */ |
| 325 | if (value) |
| 326 | --value; |
| 327 | |
| 328 | if (value > 31) |
| 329 | return -EINVAL; |
| 330 | |
| 331 | return regmap_write(info->regmap, reg, value); |
| 332 | } |
| 333 | |
| 334 | |
| 335 | static int ltc4162l_get_vcharge(struct ltc4162l_info *info, |
| 336 | unsigned int reg, |
| 337 | union power_supply_propval *val) |
| 338 | { |
| 339 | unsigned int regval; |
| 340 | int ret; |
| 341 | u32 voltage; |
| 342 | |
| 343 | ret = regmap_read(info->regmap, reg, ®val); |
| 344 | if (ret) |
| 345 | return ret; |
| 346 | |
| 347 | regval &= BIT(6) - 1; /* Only the lower 5 bits */ |
| 348 | |
| 349 | /* |
| 350 | * charge voltage setting can be computed from |
| 351 | * cell_count × (vcharge_setting × 12.5mV + 3.8125V) |
| 352 | * where vcharge_setting ranges from 0 to 31 (4.2V max). |
| 353 | */ |
| 354 | voltage = 3812500 + (regval * 12500); |
| 355 | voltage *= ltc4162l_get_cell_count(info); |
| 356 | val->intval = voltage; |
| 357 | |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static int ltc4162l_set_vcharge(struct ltc4162l_info *info, |
| 362 | unsigned int reg, |
| 363 | unsigned int value) |
| 364 | { |
| 365 | u8 cell_count = ltc4162l_get_cell_count(info); |
| 366 | |
| 367 | if (!cell_count) |
| 368 | return -EBUSY; /* Not available yet, try again later */ |
| 369 | |
| 370 | value /= cell_count; |
| 371 | |
| 372 | if (value < 3812500) |
| 373 | return -EINVAL; |
| 374 | |
| 375 | value -= 3812500; |
| 376 | value /= 12500; |
| 377 | |
| 378 | if (value > 31) |
| 379 | return -EINVAL; |
| 380 | |
| 381 | return regmap_write(info->regmap, reg, value); |
| 382 | } |
| 383 | |
| 384 | static int ltc4162l_get_iin_limit_dac(struct ltc4162l_info *info, |
| 385 | union power_supply_propval *val) |
| 386 | { |
| 387 | unsigned int regval; |
| 388 | int ret; |
| 389 | |
| 390 | ret = regmap_read(info->regmap, LTC4162L_IIN_LIMIT_DAC, ®val); |
| 391 | if (ret) |
| 392 | return ret; |
| 393 | |
| 394 | regval &= BIT(6) - 1; /* Only 6 bits */ |
| 395 | |
| 396 | /* (iin_limit_dac + 1) × 500μV / RSNSI */ |
| 397 | ++regval; |
| 398 | regval *= 5000000u; |
| 399 | regval /= info->rsnsi; |
| 400 | val->intval = 100u * regval; |
| 401 | |
| 402 | return 0; |
| 403 | } |
| 404 | |
| 405 | static int ltc4162l_set_iin_limit(struct ltc4162l_info *info, |
| 406 | unsigned int value) |
| 407 | { |
| 408 | unsigned int regval; |
| 409 | |
| 410 | regval = mult_frac(value, info->rsnsi, 50000u); |
| 411 | regval /= 10000u; |
| 412 | if (regval) |
| 413 | --regval; |
| 414 | if (regval > 63) |
| 415 | regval = 63; |
| 416 | |
| 417 | return regmap_write(info->regmap, LTC4162L_IIN_LIMIT_TARGET, regval); |
| 418 | } |
| 419 | |
| 420 | static int ltc4162l_get_die_temp(struct ltc4162l_info *info, |
| 421 | union power_supply_propval *val) |
| 422 | { |
| 423 | unsigned int regval; |
| 424 | int ret; |
| 425 | |
| 426 | ret = regmap_read(info->regmap, LTC4162L_DIE_TEMPERATURE, ®val); |
| 427 | if (ret) |
| 428 | return ret; |
| 429 | |
| 430 | /* die_temp × 0.0215°C/LSB - 264.4°C */ |
| 431 | ret = (s16)(regval & 0xFFFF); |
| 432 | ret *= 215; |
| 433 | ret /= 100; /* Centidegrees scale */ |
| 434 | ret -= 26440; |
| 435 | val->intval = ret; |
| 436 | |
| 437 | return 0; |
| 438 | } |
| 439 | |
| 440 | static int ltc4162l_get_term_current(struct ltc4162l_info *info, |
| 441 | union power_supply_propval *val) |
| 442 | { |
| 443 | unsigned int regval; |
| 444 | int ret; |
| 445 | |
| 446 | ret = regmap_read(info->regmap, LTC4162L_CHARGER_CONFIG_BITS, ®val); |
| 447 | if (ret) |
| 448 | return ret; |
| 449 | |
| 450 | /* Check if C_OVER_X_THRESHOLD is enabled */ |
| 451 | if (!(regval & BIT(2))) { |
| 452 | val->intval = 0; |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | ret = regmap_read(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, ®val); |
| 457 | if (ret) |
| 458 | return ret; |
| 459 | |
| 460 | /* 1.466μV / RSNSB amperes/LSB */ |
| 461 | regval *= 14660u; |
| 462 | regval /= info->rsnsb; |
| 463 | val->intval = 100 * regval; |
| 464 | |
| 465 | return 0; |
| 466 | } |
| 467 | |
| 468 | static int ltc4162l_set_term_current(struct ltc4162l_info *info, |
| 469 | unsigned int value) |
| 470 | { |
| 471 | int ret; |
| 472 | unsigned int regval; |
| 473 | |
| 474 | if (!value) { |
| 475 | /* Disable en_c_over_x_term when set to zero */ |
| 476 | return regmap_update_bits(info->regmap, |
| 477 | LTC4162L_CHARGER_CONFIG_BITS, |
| 478 | BIT(2), 0); |
| 479 | } |
| 480 | |
| 481 | regval = mult_frac(value, info->rsnsb, 14660u); |
| 482 | regval /= 100u; |
| 483 | |
| 484 | ret = regmap_write(info->regmap, LTC4162L_C_OVER_X_THRESHOLD, regval); |
| 485 | if (ret) |
| 486 | return ret; |
| 487 | |
| 488 | /* Set en_c_over_x_term after changing the threshold value */ |
| 489 | return regmap_update_bits(info->regmap, LTC4162L_CHARGER_CONFIG_BITS, |
| 490 | BIT(2), BIT(2)); |
| 491 | } |
| 492 | |
| 493 | /* Custom properties */ |
| 494 | static const char * const ltc4162l_charge_status_name[] = { |
| 495 | "ilim_reg_active", /* 32 */ |
| 496 | "thermal_reg_active", |
| 497 | "vin_uvcl_active", |
| 498 | "iin_limit_active", |
| 499 | "constant_current", |
| 500 | "constant_voltage", |
| 501 | "charger_off" /* 0 */ |
| 502 | }; |
| 503 | |
| 504 | static ssize_t charge_status_show(struct device *dev, |
| 505 | struct device_attribute *attr, char *buf) |
| 506 | { |
| 507 | struct power_supply *psy = to_power_supply(dev); |
| 508 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 509 | const char *result = ltc4162l_charge_status_name[ |
| 510 | ARRAY_SIZE(ltc4162l_charge_status_name) - 1]; |
| 511 | unsigned int regval; |
| 512 | unsigned int mask; |
| 513 | unsigned int index; |
| 514 | int ret; |
| 515 | |
| 516 | ret = regmap_read(info->regmap, LTC4162L_CHARGE_STATUS, ®val); |
| 517 | if (ret) |
| 518 | return ret; |
| 519 | |
| 520 | /* Only one bit is set according to datasheet, let's be safe here */ |
| 521 | for (mask = 32, index = 0; mask != 0; mask >>= 1, ++index) { |
| 522 | if (regval & mask) { |
| 523 | result = ltc4162l_charge_status_name[index]; |
| 524 | break; |
| 525 | } |
| 526 | } |
| 527 | |
| 528 | return sprintf(buf, "%s\n", result); |
| 529 | } |
| 530 | static DEVICE_ATTR_RO(charge_status); |
| 531 | |
| 532 | static ssize_t vbat_show(struct device *dev, |
| 533 | struct device_attribute *attr, char *buf) |
| 534 | { |
| 535 | struct power_supply *psy = to_power_supply(dev); |
| 536 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 537 | union power_supply_propval val; |
| 538 | int ret; |
| 539 | |
| 540 | ret = ltc4162l_get_vbat(info, LTC4162L_VBAT, &val); |
| 541 | if (ret) |
| 542 | return ret; |
| 543 | |
| 544 | return sprintf(buf, "%d\n", val.intval); |
| 545 | } |
| 546 | static DEVICE_ATTR_RO(vbat); |
| 547 | |
| 548 | static ssize_t vbat_avg_show(struct device *dev, |
| 549 | struct device_attribute *attr, char *buf) |
| 550 | { |
| 551 | struct power_supply *psy = to_power_supply(dev); |
| 552 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 553 | union power_supply_propval val; |
| 554 | int ret; |
| 555 | |
| 556 | ret = ltc4162l_get_vbat(info, LTC4162L_VBAT_FILT, &val); |
| 557 | if (ret) |
| 558 | return ret; |
| 559 | |
| 560 | return sprintf(buf, "%d\n", val.intval); |
| 561 | } |
| 562 | static DEVICE_ATTR_RO(vbat_avg); |
| 563 | |
| 564 | static ssize_t ibat_show(struct device *dev, |
| 565 | struct device_attribute *attr, char *buf) |
| 566 | { |
| 567 | struct power_supply *psy = to_power_supply(dev); |
| 568 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 569 | union power_supply_propval val; |
| 570 | int ret; |
| 571 | |
| 572 | ret = ltc4162l_get_ibat(info, &val); |
| 573 | if (ret) |
| 574 | return ret; |
| 575 | |
| 576 | return sprintf(buf, "%d\n", val.intval); |
| 577 | } |
| 578 | static DEVICE_ATTR_RO(ibat); |
| 579 | |
| 580 | static ssize_t force_telemetry_show(struct device *dev, |
| 581 | struct device_attribute *attr, char *buf) |
| 582 | { |
| 583 | struct power_supply *psy = to_power_supply(dev); |
| 584 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 585 | unsigned int regval; |
| 586 | int ret; |
| 587 | |
| 588 | ret = regmap_read(info->regmap, LTC4162L_CONFIG_BITS_REG, ®val); |
| 589 | if (ret) |
| 590 | return ret; |
| 591 | |
| 592 | return sprintf(buf, "%u\n", regval & BIT(2) ? 1 : 0); |
| 593 | } |
| 594 | |
| 595 | static ssize_t force_telemetry_store(struct device *dev, |
| 596 | struct device_attribute *attr, |
| 597 | const char *buf, |
| 598 | size_t count) |
| 599 | { |
| 600 | struct power_supply *psy = to_power_supply(dev); |
| 601 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 602 | int ret; |
| 603 | unsigned int value; |
| 604 | |
| 605 | ret = kstrtouint(buf, 0, &value); |
| 606 | if (ret < 0) |
| 607 | return ret; |
| 608 | |
| 609 | ret = regmap_update_bits(info->regmap, LTC4162L_CONFIG_BITS_REG, |
| 610 | BIT(2), value ? BIT(2) : 0); |
| 611 | if (ret < 0) |
| 612 | return ret; |
| 613 | |
| 614 | return count; |
| 615 | } |
| 616 | |
| 617 | static DEVICE_ATTR_RW(force_telemetry); |
| 618 | |
| 619 | static ssize_t arm_ship_mode_show(struct device *dev, |
| 620 | struct device_attribute *attr, char *buf) |
| 621 | { |
| 622 | struct power_supply *psy = to_power_supply(dev); |
| 623 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 624 | unsigned int regval; |
| 625 | int ret; |
| 626 | |
| 627 | ret = regmap_read(info->regmap, LTC4162L_ARM_SHIP_MODE, ®val); |
| 628 | if (ret) |
| 629 | return ret; |
| 630 | |
| 631 | return sprintf(buf, "%u\n", |
| 632 | regval == LTC4162L_ARM_SHIP_MODE_MAGIC ? 1 : 0); |
| 633 | } |
| 634 | |
| 635 | static ssize_t arm_ship_mode_store(struct device *dev, |
| 636 | struct device_attribute *attr, |
| 637 | const char *buf, |
| 638 | size_t count) |
| 639 | { |
| 640 | struct power_supply *psy = to_power_supply(dev); |
| 641 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 642 | int ret; |
| 643 | unsigned int value; |
| 644 | |
| 645 | ret = kstrtouint(buf, 0, &value); |
| 646 | if (ret < 0) |
| 647 | return ret; |
| 648 | |
| 649 | ret = regmap_write(info->regmap, LTC4162L_ARM_SHIP_MODE, |
| 650 | value ? LTC4162L_ARM_SHIP_MODE_MAGIC : 0); |
| 651 | if (ret < 0) |
| 652 | return ret; |
| 653 | |
| 654 | return count; |
| 655 | } |
| 656 | |
| 657 | static DEVICE_ATTR_RW(arm_ship_mode); |
| 658 | |
| 659 | static struct attribute *ltc4162l_sysfs_entries[] = { |
| 660 | &dev_attr_charge_status.attr, |
| 661 | &dev_attr_ibat.attr, |
| 662 | &dev_attr_vbat.attr, |
| 663 | &dev_attr_vbat_avg.attr, |
| 664 | &dev_attr_force_telemetry.attr, |
| 665 | &dev_attr_arm_ship_mode.attr, |
| 666 | NULL, |
| 667 | }; |
| 668 | |
Rikard Falkeborn | 249aacc | 2021-01-13 21:32:42 +0100 | [diff] [blame] | 669 | static const struct attribute_group ltc4162l_attr_group = { |
Mike Looijmans | cd900f1 | 2021-01-07 15:32:48 +0100 | [diff] [blame] | 670 | .name = NULL, /* put in device directory */ |
| 671 | .attrs = ltc4162l_sysfs_entries, |
| 672 | }; |
| 673 | |
| 674 | static const struct attribute_group *ltc4162l_attr_groups[] = { |
| 675 | <c4162l_attr_group, |
| 676 | NULL, |
| 677 | }; |
| 678 | |
| 679 | static int ltc4162l_get_property(struct power_supply *psy, |
| 680 | enum power_supply_property psp, |
| 681 | union power_supply_propval *val) |
| 682 | { |
| 683 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 684 | |
| 685 | switch (psp) { |
| 686 | case POWER_SUPPLY_PROP_STATUS: |
| 687 | return ltc4162l_get_status(info, val); |
| 688 | case POWER_SUPPLY_PROP_CHARGE_TYPE: |
| 689 | return ltc4162l_get_charge_type(info, val); |
| 690 | case POWER_SUPPLY_PROP_HEALTH: |
| 691 | return ltc4162l_get_health(info, val); |
| 692 | case POWER_SUPPLY_PROP_ONLINE: |
| 693 | return ltc4162l_get_online(info, val); |
| 694 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| 695 | return ltc4162l_get_input_voltage(info, val); |
| 696 | case POWER_SUPPLY_PROP_CURRENT_NOW: |
| 697 | return ltc4162l_get_input_current(info, val); |
| 698 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: |
| 699 | return ltc4162l_get_icharge(info, |
| 700 | LTC4162L_ICHARGE_DAC, val); |
| 701 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: |
| 702 | return ltc4162l_get_icharge(info, |
| 703 | LTC4162L_CHARGE_CURRENT_SETTING, val); |
| 704 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: |
| 705 | return ltc4162l_get_vcharge(info, |
| 706 | LTC4162L_VCHARGE_DAC, val); |
| 707 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: |
| 708 | return ltc4162l_get_vcharge(info, |
| 709 | LTC4162L_VCHARGE_SETTING, val); |
| 710 | case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: |
| 711 | return ltc4162l_get_iin_limit_dac(info, val); |
| 712 | case POWER_SUPPLY_PROP_TEMP: |
| 713 | return ltc4162l_get_die_temp(info, val); |
| 714 | case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: |
| 715 | return ltc4162l_get_term_current(info, val); |
| 716 | default: |
| 717 | return -EINVAL; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | static int ltc4162l_set_property(struct power_supply *psy, |
| 722 | enum power_supply_property psp, |
| 723 | const union power_supply_propval *val) |
| 724 | { |
| 725 | struct ltc4162l_info *info = power_supply_get_drvdata(psy); |
| 726 | |
| 727 | switch (psp) { |
| 728 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: |
| 729 | return ltc4162l_set_icharge(info, |
| 730 | LTC4162L_CHARGE_CURRENT_SETTING, val->intval); |
| 731 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: |
| 732 | return ltc4162l_set_vcharge(info, |
| 733 | LTC4162L_VCHARGE_SETTING, val->intval); |
| 734 | case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: |
| 735 | return ltc4162l_set_iin_limit(info, val->intval); |
| 736 | case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: |
| 737 | return ltc4162l_set_term_current(info, val->intval); |
| 738 | default: |
| 739 | return -EINVAL; |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | static int ltc4162l_property_is_writeable(struct power_supply *psy, |
| 744 | enum power_supply_property psp) |
| 745 | { |
| 746 | switch (psp) { |
| 747 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: |
| 748 | case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: |
| 749 | case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: |
| 750 | case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: |
| 751 | return 1; |
| 752 | default: |
| 753 | return 0; |
| 754 | } |
| 755 | } |
| 756 | |
| 757 | /* Charger power supply property routines */ |
| 758 | static enum power_supply_property ltc4162l_properties[] = { |
| 759 | POWER_SUPPLY_PROP_STATUS, |
| 760 | POWER_SUPPLY_PROP_CHARGE_TYPE, |
| 761 | POWER_SUPPLY_PROP_HEALTH, |
| 762 | POWER_SUPPLY_PROP_ONLINE, |
| 763 | POWER_SUPPLY_PROP_VOLTAGE_NOW, |
| 764 | POWER_SUPPLY_PROP_CURRENT_NOW, |
| 765 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, |
| 766 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, |
| 767 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, |
| 768 | POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, |
| 769 | POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, |
| 770 | POWER_SUPPLY_PROP_TEMP, |
| 771 | POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, |
| 772 | }; |
| 773 | |
| 774 | static const struct power_supply_desc ltc4162l_desc = { |
| 775 | .name = "ltc4162-l", |
| 776 | .type = POWER_SUPPLY_TYPE_MAINS, |
| 777 | .properties = ltc4162l_properties, |
| 778 | .num_properties = ARRAY_SIZE(ltc4162l_properties), |
| 779 | .get_property = ltc4162l_get_property, |
| 780 | .set_property = ltc4162l_set_property, |
| 781 | .property_is_writeable = ltc4162l_property_is_writeable, |
| 782 | }; |
| 783 | |
| 784 | static bool ltc4162l_is_writeable_reg(struct device *dev, unsigned int reg) |
| 785 | { |
| 786 | /* all registers up to this one are writeable */ |
| 787 | if (reg <= LTC4162L_CHARGER_CONFIG_BITS) |
| 788 | return true; |
| 789 | |
| 790 | /* The ALERTS registers can be written to clear alerts */ |
| 791 | if (reg >= LTC4162L_LIMIT_ALERTS_REG && |
| 792 | reg <= LTC4162L_CHARGE_STATUS_ALERTS_REG) |
| 793 | return true; |
| 794 | |
| 795 | return false; |
| 796 | } |
| 797 | |
| 798 | static bool ltc4162l_is_volatile_reg(struct device *dev, unsigned int reg) |
| 799 | { |
| 800 | /* all registers after this one are read-only status registers */ |
| 801 | return reg > LTC4162L_CHARGER_CONFIG_BITS; |
| 802 | } |
| 803 | |
| 804 | static const struct regmap_config ltc4162l_regmap_config = { |
| 805 | .reg_bits = 8, |
| 806 | .val_bits = 16, |
| 807 | .val_format_endian = REGMAP_ENDIAN_LITTLE, |
| 808 | .writeable_reg = ltc4162l_is_writeable_reg, |
| 809 | .volatile_reg = ltc4162l_is_volatile_reg, |
| 810 | .max_register = LTC4162L_INPUT_UNDERVOLTAGE_DAC, |
| 811 | .cache_type = REGCACHE_RBTREE, |
| 812 | }; |
| 813 | |
| 814 | static void ltc4162l_clear_interrupts(struct ltc4162l_info *info) |
| 815 | { |
| 816 | /* Acknowledge interrupt to chip by clearing all events */ |
| 817 | regmap_write(info->regmap, LTC4162L_LIMIT_ALERTS_REG, 0); |
| 818 | regmap_write(info->regmap, LTC4162L_CHARGER_STATE_ALERTS_REG, 0); |
| 819 | regmap_write(info->regmap, LTC4162L_CHARGE_STATUS_ALERTS_REG, 0); |
| 820 | } |
| 821 | |
| 822 | static int ltc4162l_probe(struct i2c_client *client, |
| 823 | const struct i2c_device_id *id) |
| 824 | { |
| 825 | struct i2c_adapter *adapter = client->adapter; |
| 826 | struct device *dev = &client->dev; |
| 827 | struct ltc4162l_info *info; |
| 828 | struct power_supply_config ltc4162l_config = {}; |
| 829 | u32 value; |
| 830 | int ret; |
| 831 | |
| 832 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) { |
| 833 | dev_err(dev, "No support for SMBUS_WORD_DATA\n"); |
| 834 | return -ENODEV; |
| 835 | } |
| 836 | info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); |
| 837 | if (!info) |
| 838 | return -ENOMEM; |
| 839 | |
| 840 | info->client = client; |
| 841 | i2c_set_clientdata(client, info); |
| 842 | |
| 843 | info->regmap = devm_regmap_init_i2c(client, <c4162l_regmap_config); |
| 844 | if (IS_ERR(info->regmap)) { |
| 845 | dev_err(dev, "Failed to initialize register map\n"); |
| 846 | return PTR_ERR(info->regmap); |
| 847 | } |
| 848 | |
| 849 | ret = device_property_read_u32(dev, "lltc,rsnsb-micro-ohms", |
| 850 | &info->rsnsb); |
| 851 | if (ret) { |
| 852 | dev_err(dev, "Missing lltc,rsnsb-micro-ohms property\n"); |
| 853 | return ret; |
| 854 | } |
| 855 | if (!info->rsnsb) |
| 856 | return -EINVAL; |
| 857 | |
| 858 | ret = device_property_read_u32(dev, "lltc,rsnsi-micro-ohms", |
| 859 | &info->rsnsi); |
| 860 | if (ret) { |
| 861 | dev_err(dev, "Missing lltc,rsnsi-micro-ohms property\n"); |
| 862 | return ret; |
| 863 | } |
| 864 | if (!info->rsnsi) |
| 865 | return -EINVAL; |
| 866 | |
| 867 | if (!device_property_read_u32(dev, "lltc,cell-count", &value)) |
| 868 | info->cell_count = value; |
| 869 | |
| 870 | ltc4162l_config.of_node = dev->of_node; |
| 871 | ltc4162l_config.drv_data = info; |
| 872 | ltc4162l_config.attr_grp = ltc4162l_attr_groups; |
| 873 | |
| 874 | info->charger = devm_power_supply_register(dev, <c4162l_desc, |
| 875 | <c4162l_config); |
| 876 | if (IS_ERR(info->charger)) { |
| 877 | dev_err(dev, "Failed to register charger\n"); |
| 878 | return PTR_ERR(info->charger); |
| 879 | } |
| 880 | |
| 881 | /* Disable the threshold alerts, we're not using them */ |
| 882 | regmap_write(info->regmap, LTC4162L_EN_LIMIT_ALERTS_REG, 0); |
| 883 | |
| 884 | /* Enable interrupts on all status changes */ |
| 885 | regmap_write(info->regmap, LTC4162L_EN_CHARGER_STATE_ALERTS_REG, |
| 886 | 0x1fff); |
| 887 | regmap_write(info->regmap, LTC4162L_EN_CHARGE_STATUS_ALERTS_REG, 0x1f); |
| 888 | |
| 889 | ltc4162l_clear_interrupts(info); |
| 890 | |
| 891 | return 0; |
| 892 | } |
| 893 | |
| 894 | static void ltc4162l_alert(struct i2c_client *client, |
| 895 | enum i2c_alert_protocol type, unsigned int flag) |
| 896 | { |
| 897 | struct ltc4162l_info *info = i2c_get_clientdata(client); |
| 898 | |
| 899 | if (type != I2C_PROTOCOL_SMBUS_ALERT) |
| 900 | return; |
| 901 | |
| 902 | ltc4162l_clear_interrupts(info); |
| 903 | power_supply_changed(info->charger); |
| 904 | } |
| 905 | |
| 906 | static const struct i2c_device_id ltc4162l_i2c_id_table[] = { |
| 907 | { "ltc4162-l", 0 }, |
| 908 | { }, |
| 909 | }; |
| 910 | MODULE_DEVICE_TABLE(i2c, ltc4162l_i2c_id_table); |
| 911 | |
| 912 | static const struct of_device_id ltc4162l_of_match[] = { |
| 913 | { .compatible = "lltc,ltc4162-l", }, |
| 914 | { }, |
| 915 | }; |
| 916 | MODULE_DEVICE_TABLE(of, ltc4162l_of_match); |
| 917 | |
| 918 | static struct i2c_driver ltc4162l_driver = { |
| 919 | .probe = ltc4162l_probe, |
| 920 | .alert = ltc4162l_alert, |
| 921 | .id_table = ltc4162l_i2c_id_table, |
| 922 | .driver = { |
| 923 | .name = "ltc4162-l-charger", |
| 924 | .of_match_table = of_match_ptr(ltc4162l_of_match), |
| 925 | }, |
| 926 | }; |
| 927 | module_i2c_driver(ltc4162l_driver); |
| 928 | |
| 929 | MODULE_LICENSE("GPL"); |
| 930 | MODULE_AUTHOR("Mike Looijmans <mike.looijmans@topic.nl>"); |
| 931 | MODULE_DESCRIPTION("LTC4162-L charger driver"); |