1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * bq2415x charger driver 4 * 5 * Copyright (C) 2011-2013 Pali Rohár <pali@kernel.org> 6 * 7 * Datasheets: 8 * https://www.ti.com/product/bq24150 9 * https://www.ti.com/product/bq24150a 10 * https://www.ti.com/product/bq24152 11 * https://www.ti.com/product/bq24153 12 * https://www.ti.com/product/bq24153a 13 * https://www.ti.com/product/bq24155 14 * https://www.ti.com/product/bq24157s 15 * https://www.ti.com/product/bq24158 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/param.h> 21 #include <linux/err.h> 22 #include <linux/workqueue.h> 23 #include <linux/sysfs.h> 24 #include <linux/platform_device.h> 25 #include <linux/power_supply.h> 26 #include <linux/idr.h> 27 #include <linux/i2c.h> 28 #include <linux/slab.h> 29 #include <linux/acpi.h> 30 31 #include <linux/power/bq2415x_charger.h> 32 33 /* timeout for resetting chip timer */ 34 #define BQ2415X_TIMER_TIMEOUT 10 35 36 #define BQ2415X_REG_STATUS 0x00 37 #define BQ2415X_REG_CONTROL 0x01 38 #define BQ2415X_REG_VOLTAGE 0x02 39 #define BQ2415X_REG_VENDER 0x03 40 #define BQ2415X_REG_CURRENT 0x04 41 42 /* reset state for all registers */ 43 #define BQ2415X_RESET_STATUS BIT(6) 44 #define BQ2415X_RESET_CONTROL (BIT(4)|BIT(5)) 45 #define BQ2415X_RESET_VOLTAGE (BIT(1)|BIT(3)) 46 #define BQ2415X_RESET_CURRENT (BIT(0)|BIT(3)|BIT(7)) 47 48 /* status register */ 49 #define BQ2415X_BIT_TMR_RST 7 50 #define BQ2415X_BIT_OTG 7 51 #define BQ2415X_BIT_EN_STAT 6 52 #define BQ2415X_MASK_STAT (BIT(4)|BIT(5)) 53 #define BQ2415X_SHIFT_STAT 4 54 #define BQ2415X_BIT_BOOST 3 55 #define BQ2415X_MASK_FAULT (BIT(0)|BIT(1)|BIT(2)) 56 #define BQ2415X_SHIFT_FAULT 0 57 58 /* control register */ 59 #define BQ2415X_MASK_LIMIT (BIT(6)|BIT(7)) 60 #define BQ2415X_SHIFT_LIMIT 6 61 #define BQ2415X_MASK_VLOWV (BIT(4)|BIT(5)) 62 #define BQ2415X_SHIFT_VLOWV 4 63 #define BQ2415X_BIT_TE 3 64 #define BQ2415X_BIT_CE 2 65 #define BQ2415X_BIT_HZ_MODE 1 66 #define BQ2415X_BIT_OPA_MODE 0 67 68 /* voltage register */ 69 #define BQ2415X_MASK_VO (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7)) 70 #define BQ2415X_SHIFT_VO 2 71 #define BQ2415X_BIT_OTG_PL 1 72 #define BQ2415X_BIT_OTG_EN 0 73 74 /* vender register */ 75 #define BQ2415X_MASK_VENDER (BIT(5)|BIT(6)|BIT(7)) 76 #define BQ2415X_SHIFT_VENDER 5 77 #define BQ2415X_MASK_PN (BIT(3)|BIT(4)) 78 #define BQ2415X_SHIFT_PN 3 79 #define BQ2415X_MASK_REVISION (BIT(0)|BIT(1)|BIT(2)) 80 #define BQ2415X_SHIFT_REVISION 0 81 82 /* current register */ 83 #define BQ2415X_MASK_RESET BIT(7) 84 #define BQ2415X_MASK_VI_CHRG (BIT(4)|BIT(5)|BIT(6)) 85 #define BQ2415X_SHIFT_VI_CHRG 4 86 /* N/A BIT(3) */ 87 #define BQ2415X_MASK_VI_TERM (BIT(0)|BIT(1)|BIT(2)) 88 #define BQ2415X_SHIFT_VI_TERM 0 89 90 91 enum bq2415x_command { 92 BQ2415X_TIMER_RESET, 93 BQ2415X_OTG_STATUS, 94 BQ2415X_STAT_PIN_STATUS, 95 BQ2415X_STAT_PIN_ENABLE, 96 BQ2415X_STAT_PIN_DISABLE, 97 BQ2415X_CHARGE_STATUS, 98 BQ2415X_BOOST_STATUS, 99 BQ2415X_FAULT_STATUS, 100 101 BQ2415X_CHARGE_TERMINATION_STATUS, 102 BQ2415X_CHARGE_TERMINATION_ENABLE, 103 BQ2415X_CHARGE_TERMINATION_DISABLE, 104 BQ2415X_CHARGER_STATUS, 105 BQ2415X_CHARGER_ENABLE, 106 BQ2415X_CHARGER_DISABLE, 107 BQ2415X_HIGH_IMPEDANCE_STATUS, 108 BQ2415X_HIGH_IMPEDANCE_ENABLE, 109 BQ2415X_HIGH_IMPEDANCE_DISABLE, 110 BQ2415X_BOOST_MODE_STATUS, 111 BQ2415X_BOOST_MODE_ENABLE, 112 BQ2415X_BOOST_MODE_DISABLE, 113 114 BQ2415X_OTG_LEVEL, 115 BQ2415X_OTG_ACTIVATE_HIGH, 116 BQ2415X_OTG_ACTIVATE_LOW, 117 BQ2415X_OTG_PIN_STATUS, 118 BQ2415X_OTG_PIN_ENABLE, 119 BQ2415X_OTG_PIN_DISABLE, 120 121 BQ2415X_VENDER_CODE, 122 BQ2415X_PART_NUMBER, 123 BQ2415X_REVISION, 124 }; 125 126 enum bq2415x_chip { 127 BQUNKNOWN, 128 BQ24150, 129 BQ24150A, 130 BQ24151, 131 BQ24151A, 132 BQ24152, 133 BQ24153, 134 BQ24153A, 135 BQ24155, 136 BQ24156, 137 BQ24156A, 138 BQ24157S, 139 BQ24158, 140 }; 141 142 static char *bq2415x_chip_name[] = { 143 "unknown", 144 "bq24150", 145 "bq24150a", 146 "bq24151", 147 "bq24151a", 148 "bq24152", 149 "bq24153", 150 "bq24153a", 151 "bq24155", 152 "bq24156", 153 "bq24156a", 154 "bq24157s", 155 "bq24158", 156 }; 157 158 struct bq2415x_device { 159 struct device *dev; 160 struct bq2415x_platform_data init_data; 161 struct power_supply *charger; 162 struct power_supply_desc charger_desc; 163 struct delayed_work work; 164 struct device_node *notify_node; 165 struct notifier_block nb; 166 enum bq2415x_mode reported_mode;/* mode reported by hook function */ 167 enum bq2415x_mode mode; /* currently configured mode */ 168 enum bq2415x_chip chip; 169 const char *timer_error; 170 char *model; 171 char *name; 172 int autotimer; /* 1 - if driver automatically reset timer, 0 - not */ 173 int automode; /* 1 - enabled, 0 - disabled; -1 - not supported */ 174 int charge_status; 175 int id; 176 }; 177 178 /* each registered chip must have unique id */ 179 static DEFINE_IDR(bq2415x_id); 180 181 static DEFINE_MUTEX(bq2415x_id_mutex); 182 static DEFINE_MUTEX(bq2415x_timer_mutex); 183 static DEFINE_MUTEX(bq2415x_i2c_mutex); 184 185 /**** i2c read functions ****/ 186 187 /* read value from register */ 188 static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg) 189 { 190 struct i2c_client *client = to_i2c_client(bq->dev); 191 struct i2c_msg msg[2]; 192 u8 val; 193 int ret; 194 195 if (!client->adapter) 196 return -ENODEV; 197 198 msg[0].addr = client->addr; 199 msg[0].flags = 0; 200 msg[0].buf = ® 201 msg[0].len = sizeof(reg); 202 msg[1].addr = client->addr; 203 msg[1].flags = I2C_M_RD; 204 msg[1].buf = &val; 205 msg[1].len = sizeof(val); 206 207 mutex_lock(&bq2415x_i2c_mutex); 208 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); 209 mutex_unlock(&bq2415x_i2c_mutex); 210 211 if (ret < 0) 212 return ret; 213 214 return val; 215 } 216 217 /* read value from register, apply mask and right shift it */ 218 static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg, 219 u8 mask, u8 shift) 220 { 221 int ret; 222 223 if (shift > 8) 224 return -EINVAL; 225 226 ret = bq2415x_i2c_read(bq, reg); 227 if (ret < 0) 228 return ret; 229 return (ret & mask) >> shift; 230 } 231 232 /* read value from register and return one specified bit */ 233 static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit) 234 { 235 if (bit > 8) 236 return -EINVAL; 237 return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit); 238 } 239 240 /**** i2c write functions ****/ 241 242 /* write value to register */ 243 static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val) 244 { 245 struct i2c_client *client = to_i2c_client(bq->dev); 246 struct i2c_msg msg[1]; 247 u8 data[2]; 248 int ret; 249 250 data[0] = reg; 251 data[1] = val; 252 253 msg[0].addr = client->addr; 254 msg[0].flags = 0; 255 msg[0].buf = data; 256 msg[0].len = ARRAY_SIZE(data); 257 258 mutex_lock(&bq2415x_i2c_mutex); 259 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); 260 mutex_unlock(&bq2415x_i2c_mutex); 261 262 /* i2c_transfer returns number of messages transferred */ 263 if (ret < 0) 264 return ret; 265 else if (ret != 1) 266 return -EIO; 267 268 return 0; 269 } 270 271 /* read value from register, change it with mask left shifted and write back */ 272 static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val, 273 u8 mask, u8 shift) 274 { 275 int ret; 276 277 if (shift > 8) 278 return -EINVAL; 279 280 ret = bq2415x_i2c_read(bq, reg); 281 if (ret < 0) 282 return ret; 283 284 ret &= ~mask; 285 ret |= val << shift; 286 287 return bq2415x_i2c_write(bq, reg, ret); 288 } 289 290 /* change only one bit in register */ 291 static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg, 292 bool val, u8 bit) 293 { 294 if (bit > 8) 295 return -EINVAL; 296 return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit); 297 } 298 299 /**** global functions ****/ 300 301 /* exec command function */ 302 static int bq2415x_exec_command(struct bq2415x_device *bq, 303 enum bq2415x_command command) 304 { 305 int ret; 306 307 switch (command) { 308 case BQ2415X_TIMER_RESET: 309 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 310 1, BQ2415X_BIT_TMR_RST); 311 case BQ2415X_OTG_STATUS: 312 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS, 313 BQ2415X_BIT_OTG); 314 case BQ2415X_STAT_PIN_STATUS: 315 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS, 316 BQ2415X_BIT_EN_STAT); 317 case BQ2415X_STAT_PIN_ENABLE: 318 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1, 319 BQ2415X_BIT_EN_STAT); 320 case BQ2415X_STAT_PIN_DISABLE: 321 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0, 322 BQ2415X_BIT_EN_STAT); 323 case BQ2415X_CHARGE_STATUS: 324 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS, 325 BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT); 326 case BQ2415X_BOOST_STATUS: 327 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS, 328 BQ2415X_BIT_BOOST); 329 case BQ2415X_FAULT_STATUS: 330 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS, 331 BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT); 332 333 case BQ2415X_CHARGE_TERMINATION_STATUS: 334 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 335 BQ2415X_BIT_TE); 336 case BQ2415X_CHARGE_TERMINATION_ENABLE: 337 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 338 1, BQ2415X_BIT_TE); 339 case BQ2415X_CHARGE_TERMINATION_DISABLE: 340 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 341 0, BQ2415X_BIT_TE); 342 case BQ2415X_CHARGER_STATUS: 343 ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 344 BQ2415X_BIT_CE); 345 if (ret < 0) 346 return ret; 347 return ret > 0 ? 0 : 1; 348 case BQ2415X_CHARGER_ENABLE: 349 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 350 0, BQ2415X_BIT_CE); 351 case BQ2415X_CHARGER_DISABLE: 352 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 353 1, BQ2415X_BIT_CE); 354 case BQ2415X_HIGH_IMPEDANCE_STATUS: 355 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 356 BQ2415X_BIT_HZ_MODE); 357 case BQ2415X_HIGH_IMPEDANCE_ENABLE: 358 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 359 1, BQ2415X_BIT_HZ_MODE); 360 case BQ2415X_HIGH_IMPEDANCE_DISABLE: 361 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 362 0, BQ2415X_BIT_HZ_MODE); 363 case BQ2415X_BOOST_MODE_STATUS: 364 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 365 BQ2415X_BIT_OPA_MODE); 366 case BQ2415X_BOOST_MODE_ENABLE: 367 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 368 1, BQ2415X_BIT_OPA_MODE); 369 case BQ2415X_BOOST_MODE_DISABLE: 370 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 371 0, BQ2415X_BIT_OPA_MODE); 372 373 case BQ2415X_OTG_LEVEL: 374 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE, 375 BQ2415X_BIT_OTG_PL); 376 case BQ2415X_OTG_ACTIVATE_HIGH: 377 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 378 1, BQ2415X_BIT_OTG_PL); 379 case BQ2415X_OTG_ACTIVATE_LOW: 380 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 381 0, BQ2415X_BIT_OTG_PL); 382 case BQ2415X_OTG_PIN_STATUS: 383 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE, 384 BQ2415X_BIT_OTG_EN); 385 case BQ2415X_OTG_PIN_ENABLE: 386 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 387 1, BQ2415X_BIT_OTG_EN); 388 case BQ2415X_OTG_PIN_DISABLE: 389 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 390 0, BQ2415X_BIT_OTG_EN); 391 392 case BQ2415X_VENDER_CODE: 393 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER, 394 BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER); 395 case BQ2415X_PART_NUMBER: 396 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER, 397 BQ2415X_MASK_PN, BQ2415X_SHIFT_PN); 398 case BQ2415X_REVISION: 399 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER, 400 BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION); 401 } 402 return -EINVAL; 403 } 404 405 /* detect chip type */ 406 static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq) 407 { 408 struct i2c_client *client = to_i2c_client(bq->dev); 409 int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER); 410 411 if (ret < 0) 412 return ret; 413 414 switch (client->addr) { 415 case 0x6b: 416 switch (ret) { 417 case 0: 418 if (bq->chip == BQ24151A) 419 return bq->chip; 420 return BQ24151; 421 case 1: 422 if (bq->chip == BQ24150A || 423 bq->chip == BQ24152 || 424 bq->chip == BQ24155) 425 return bq->chip; 426 return BQ24150; 427 case 2: 428 if (bq->chip == BQ24153A) 429 return bq->chip; 430 return BQ24153; 431 default: 432 return BQUNKNOWN; 433 } 434 break; 435 436 case 0x6a: 437 switch (ret) { 438 case 0: 439 if (bq->chip == BQ24156A) 440 return bq->chip; 441 return BQ24156; 442 case 2: 443 if (bq->chip == BQ24157S) 444 return bq->chip; 445 return BQ24158; 446 default: 447 return BQUNKNOWN; 448 } 449 break; 450 } 451 452 return BQUNKNOWN; 453 } 454 455 /* detect chip revision */ 456 static int bq2415x_detect_revision(struct bq2415x_device *bq) 457 { 458 int ret = bq2415x_exec_command(bq, BQ2415X_REVISION); 459 int chip = bq2415x_detect_chip(bq); 460 461 if (ret < 0 || chip < 0) 462 return -1; 463 464 switch (chip) { 465 case BQ24150: 466 case BQ24150A: 467 case BQ24151: 468 case BQ24151A: 469 case BQ24152: 470 if (ret >= 0 && ret <= 3) 471 return ret; 472 return -1; 473 case BQ24153: 474 case BQ24153A: 475 case BQ24156: 476 case BQ24156A: 477 case BQ24157S: 478 case BQ24158: 479 if (ret == 3) 480 return 0; 481 else if (ret == 1) 482 return 1; 483 return -1; 484 case BQ24155: 485 if (ret == 3) 486 return 3; 487 return -1; 488 case BQUNKNOWN: 489 return -1; 490 } 491 492 return -1; 493 } 494 495 /* return chip vender code */ 496 static int bq2415x_get_vender_code(struct bq2415x_device *bq) 497 { 498 int ret; 499 500 ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE); 501 if (ret < 0) 502 return 0; 503 504 /* convert to binary */ 505 return (ret & 0x1) + 506 ((ret >> 1) & 0x1) * 10 + 507 ((ret >> 2) & 0x1) * 100; 508 } 509 510 /* reset all chip registers to default state */ 511 static void bq2415x_reset_chip(struct bq2415x_device *bq) 512 { 513 bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT); 514 bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE); 515 bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL); 516 bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS); 517 bq->timer_error = NULL; 518 } 519 520 /**** properties functions ****/ 521 522 /* set current limit in mA */ 523 static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA) 524 { 525 int val; 526 527 if (mA <= 100) 528 val = 0; 529 else if (mA <= 500) 530 val = 1; 531 else if (mA <= 800) 532 val = 2; 533 else 534 val = 3; 535 536 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val, 537 BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT); 538 } 539 540 /* get current limit in mA */ 541 static int bq2415x_get_current_limit(struct bq2415x_device *bq) 542 { 543 int ret; 544 545 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL, 546 BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT); 547 if (ret < 0) 548 return ret; 549 else if (ret == 0) 550 return 100; 551 else if (ret == 1) 552 return 500; 553 else if (ret == 2) 554 return 800; 555 else if (ret == 3) 556 return 1800; 557 return -EINVAL; 558 } 559 560 /* set weak battery voltage in mV */ 561 static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV) 562 { 563 int val; 564 565 /* round to 100mV */ 566 if (mV <= 3400 + 50) 567 val = 0; 568 else if (mV <= 3500 + 50) 569 val = 1; 570 else if (mV <= 3600 + 50) 571 val = 2; 572 else 573 val = 3; 574 575 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val, 576 BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV); 577 } 578 579 /* get weak battery voltage in mV */ 580 static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq) 581 { 582 int ret; 583 584 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL, 585 BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV); 586 if (ret < 0) 587 return ret; 588 return 100 * (34 + ret); 589 } 590 591 /* set battery regulation voltage in mV */ 592 static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq, 593 int mV) 594 { 595 int val = (mV/10 - 350) / 2; 596 597 /* 598 * According to datasheet, maximum battery regulation voltage is 599 * 4440mV which is b101111 = 47. 600 */ 601 if (val < 0) 602 val = 0; 603 else if (val > 47) 604 return -EINVAL; 605 606 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val, 607 BQ2415X_MASK_VO, BQ2415X_SHIFT_VO); 608 } 609 610 /* get battery regulation voltage in mV */ 611 static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq) 612 { 613 int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE, 614 BQ2415X_MASK_VO, BQ2415X_SHIFT_VO); 615 616 if (ret < 0) 617 return ret; 618 return 10 * (350 + 2*ret); 619 } 620 621 /* set charge current in mA (platform data must provide resistor sense) */ 622 static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA) 623 { 624 int val; 625 626 if (bq->init_data.resistor_sense <= 0) 627 return -EINVAL; 628 629 val = (mA * bq->init_data.resistor_sense - 37400) / 6800; 630 if (val < 0) 631 val = 0; 632 else if (val > 7) 633 val = 7; 634 635 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val, 636 BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET, 637 BQ2415X_SHIFT_VI_CHRG); 638 } 639 640 /* get charge current in mA (platform data must provide resistor sense) */ 641 static int bq2415x_get_charge_current(struct bq2415x_device *bq) 642 { 643 int ret; 644 645 if (bq->init_data.resistor_sense <= 0) 646 return -EINVAL; 647 648 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT, 649 BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG); 650 if (ret < 0) 651 return ret; 652 return (37400 + 6800*ret) / bq->init_data.resistor_sense; 653 } 654 655 /* set termination current in mA (platform data must provide resistor sense) */ 656 static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA) 657 { 658 int val; 659 660 if (bq->init_data.resistor_sense <= 0) 661 return -EINVAL; 662 663 val = (mA * bq->init_data.resistor_sense - 3400) / 3400; 664 if (val < 0) 665 val = 0; 666 else if (val > 7) 667 val = 7; 668 669 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val, 670 BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET, 671 BQ2415X_SHIFT_VI_TERM); 672 } 673 674 /* get termination current in mA (platform data must provide resistor sense) */ 675 static int bq2415x_get_termination_current(struct bq2415x_device *bq) 676 { 677 int ret; 678 679 if (bq->init_data.resistor_sense <= 0) 680 return -EINVAL; 681 682 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT, 683 BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM); 684 if (ret < 0) 685 return ret; 686 return (3400 + 3400*ret) / bq->init_data.resistor_sense; 687 } 688 689 /* set default value of property */ 690 #define bq2415x_set_default_value(bq, prop) \ 691 do { \ 692 int ret = 0; \ 693 if (bq->init_data.prop != -1) \ 694 ret = bq2415x_set_##prop(bq, bq->init_data.prop); \ 695 if (ret < 0) \ 696 return ret; \ 697 } while (0) 698 699 /* set default values of all properties */ 700 static int bq2415x_set_defaults(struct bq2415x_device *bq) 701 { 702 bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE); 703 bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE); 704 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE); 705 706 bq2415x_set_default_value(bq, current_limit); 707 bq2415x_set_default_value(bq, weak_battery_voltage); 708 bq2415x_set_default_value(bq, battery_regulation_voltage); 709 710 if (bq->init_data.resistor_sense > 0) { 711 bq2415x_set_default_value(bq, charge_current); 712 bq2415x_set_default_value(bq, termination_current); 713 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE); 714 } 715 716 bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE); 717 return 0; 718 } 719 720 /**** charger mode functions ****/ 721 722 /* set charger mode */ 723 static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode) 724 { 725 int ret = 0; 726 int charger = 0; 727 int boost = 0; 728 729 if (mode == BQ2415X_MODE_BOOST) 730 boost = 1; 731 else if (mode != BQ2415X_MODE_OFF) 732 charger = 1; 733 734 if (!charger) 735 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE); 736 737 if (!boost) 738 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE); 739 740 if (ret < 0) 741 return ret; 742 743 switch (mode) { 744 case BQ2415X_MODE_OFF: 745 dev_dbg(bq->dev, "changing mode to: Offline\n"); 746 ret = bq2415x_set_current_limit(bq, 100); 747 break; 748 case BQ2415X_MODE_NONE: 749 dev_dbg(bq->dev, "changing mode to: N/A\n"); 750 ret = bq2415x_set_current_limit(bq, 100); 751 break; 752 case BQ2415X_MODE_HOST_CHARGER: 753 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n"); 754 ret = bq2415x_set_current_limit(bq, 500); 755 break; 756 case BQ2415X_MODE_DEDICATED_CHARGER: 757 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n"); 758 ret = bq2415x_set_current_limit(bq, 1800); 759 break; 760 case BQ2415X_MODE_BOOST: /* Boost mode */ 761 dev_dbg(bq->dev, "changing mode to: Boost\n"); 762 ret = bq2415x_set_current_limit(bq, 100); 763 break; 764 } 765 766 if (ret < 0) 767 return ret; 768 769 if (charger) 770 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE); 771 else if (boost) 772 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE); 773 774 if (ret < 0) 775 return ret; 776 777 bq2415x_set_default_value(bq, weak_battery_voltage); 778 bq2415x_set_default_value(bq, battery_regulation_voltage); 779 780 bq->mode = mode; 781 sysfs_notify(&bq->charger->dev.kobj, NULL, "mode"); 782 783 return 0; 784 785 } 786 787 static bool bq2415x_update_reported_mode(struct bq2415x_device *bq, int mA) 788 { 789 enum bq2415x_mode mode; 790 791 if (mA == 0) 792 mode = BQ2415X_MODE_OFF; 793 else if (mA < 500) 794 mode = BQ2415X_MODE_NONE; 795 else if (mA < 1800) 796 mode = BQ2415X_MODE_HOST_CHARGER; 797 else 798 mode = BQ2415X_MODE_DEDICATED_CHARGER; 799 800 if (bq->reported_mode == mode) 801 return false; 802 803 bq->reported_mode = mode; 804 return true; 805 } 806 807 static int bq2415x_notifier_call(struct notifier_block *nb, 808 unsigned long val, void *v) 809 { 810 struct bq2415x_device *bq = 811 container_of(nb, struct bq2415x_device, nb); 812 struct power_supply *psy = v; 813 union power_supply_propval prop; 814 int ret; 815 816 if (val != PSY_EVENT_PROP_CHANGED) 817 return NOTIFY_OK; 818 819 /* Ignore event if it was not send by notify_node/notify_device */ 820 if (bq->notify_node) { 821 if (!psy->dev.parent || 822 psy->dev.parent->of_node != bq->notify_node) 823 return NOTIFY_OK; 824 } else if (bq->init_data.notify_device) { 825 if (strcmp(psy->desc->name, bq->init_data.notify_device) != 0) 826 return NOTIFY_OK; 827 } 828 829 dev_dbg(bq->dev, "notifier call was called\n"); 830 831 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX, 832 &prop); 833 if (ret != 0) 834 return NOTIFY_OK; 835 836 if (!bq2415x_update_reported_mode(bq, prop.intval)) 837 return NOTIFY_OK; 838 839 power_supply_changed(bq->charger); 840 841 /* if automode is not enabled do not tell about reported_mode */ 842 if (bq->automode < 1) 843 return NOTIFY_OK; 844 845 mod_delayed_work(system_wq, &bq->work, 0); 846 847 return NOTIFY_OK; 848 } 849 850 /**** timer functions ****/ 851 852 /* enable/disable auto resetting chip timer */ 853 static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state) 854 { 855 mutex_lock(&bq2415x_timer_mutex); 856 857 if (bq->autotimer == state) { 858 mutex_unlock(&bq2415x_timer_mutex); 859 return; 860 } 861 862 bq->autotimer = state; 863 864 if (state) { 865 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ); 866 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET); 867 bq->timer_error = NULL; 868 } else { 869 cancel_delayed_work_sync(&bq->work); 870 } 871 872 mutex_unlock(&bq2415x_timer_mutex); 873 } 874 875 /* called by bq2415x_timer_work on timer error */ 876 static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg) 877 { 878 bq->timer_error = msg; 879 sysfs_notify(&bq->charger->dev.kobj, NULL, "timer"); 880 dev_err(bq->dev, "%s\n", msg); 881 if (bq->automode > 0) 882 bq->automode = 0; 883 bq2415x_set_mode(bq, BQ2415X_MODE_OFF); 884 bq2415x_set_autotimer(bq, 0); 885 } 886 887 /* delayed work function for auto resetting chip timer */ 888 static void bq2415x_timer_work(struct work_struct *work) 889 { 890 struct bq2415x_device *bq = container_of(work, struct bq2415x_device, 891 work.work); 892 int ret; 893 int error; 894 int boost; 895 int charge; 896 897 if (bq->automode > 0 && (bq->reported_mode != bq->mode)) { 898 sysfs_notify(&bq->charger->dev.kobj, NULL, "reported_mode"); 899 bq2415x_set_mode(bq, bq->reported_mode); 900 } 901 902 charge = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS); 903 if (bq->charge_status != charge) { 904 power_supply_changed(bq->charger); 905 bq->charge_status = charge; 906 } 907 908 if (!bq->autotimer) 909 return; 910 911 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET); 912 if (ret < 0) { 913 bq2415x_timer_error(bq, "Resetting timer failed"); 914 return; 915 } 916 917 boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS); 918 if (boost < 0) { 919 bq2415x_timer_error(bq, "Unknown error"); 920 return; 921 } 922 923 error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS); 924 if (error < 0) { 925 bq2415x_timer_error(bq, "Unknown error"); 926 return; 927 } 928 929 if (boost) { 930 switch (error) { 931 /* Non fatal errors, chip is OK */ 932 case 0: /* No error */ 933 break; 934 case 6: /* Timer expired */ 935 dev_err(bq->dev, "Timer expired\n"); 936 break; 937 case 3: /* Battery voltage too low */ 938 dev_err(bq->dev, "Battery voltage to low\n"); 939 break; 940 941 /* Fatal errors, disable and reset chip */ 942 case 1: /* Overvoltage protection (chip fried) */ 943 bq2415x_timer_error(bq, 944 "Overvoltage protection (chip fried)"); 945 return; 946 case 2: /* Overload */ 947 bq2415x_timer_error(bq, "Overload"); 948 return; 949 case 4: /* Battery overvoltage protection */ 950 bq2415x_timer_error(bq, 951 "Battery overvoltage protection"); 952 return; 953 case 5: /* Thermal shutdown (too hot) */ 954 bq2415x_timer_error(bq, 955 "Thermal shutdown (too hot)"); 956 return; 957 case 7: /* N/A */ 958 bq2415x_timer_error(bq, "Unknown error"); 959 return; 960 } 961 } else { 962 switch (error) { 963 /* Non fatal errors, chip is OK */ 964 case 0: /* No error */ 965 break; 966 case 2: /* Sleep mode */ 967 dev_err(bq->dev, "Sleep mode\n"); 968 break; 969 case 3: /* Poor input source */ 970 dev_err(bq->dev, "Poor input source\n"); 971 break; 972 case 6: /* Timer expired */ 973 dev_err(bq->dev, "Timer expired\n"); 974 break; 975 case 7: /* No battery */ 976 dev_err(bq->dev, "No battery\n"); 977 break; 978 979 /* Fatal errors, disable and reset chip */ 980 case 1: /* Overvoltage protection (chip fried) */ 981 bq2415x_timer_error(bq, 982 "Overvoltage protection (chip fried)"); 983 return; 984 case 4: /* Battery overvoltage protection */ 985 bq2415x_timer_error(bq, 986 "Battery overvoltage protection"); 987 return; 988 case 5: /* Thermal shutdown (too hot) */ 989 bq2415x_timer_error(bq, 990 "Thermal shutdown (too hot)"); 991 return; 992 } 993 } 994 995 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ); 996 } 997 998 /**** power supply interface code ****/ 999 1000 static enum power_supply_property bq2415x_power_supply_props[] = { 1001 /* TODO: maybe add more power supply properties */ 1002 POWER_SUPPLY_PROP_STATUS, 1003 POWER_SUPPLY_PROP_MODEL_NAME, 1004 POWER_SUPPLY_PROP_ONLINE, 1005 }; 1006 1007 static int bq2415x_power_supply_get_property(struct power_supply *psy, 1008 enum power_supply_property psp, 1009 union power_supply_propval *val) 1010 { 1011 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1012 int ret; 1013 1014 switch (psp) { 1015 case POWER_SUPPLY_PROP_STATUS: 1016 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS); 1017 if (ret < 0) 1018 return ret; 1019 else if (ret == 0) /* Ready */ 1020 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 1021 else if (ret == 1) /* Charge in progress */ 1022 val->intval = POWER_SUPPLY_STATUS_CHARGING; 1023 else if (ret == 2) /* Charge done */ 1024 val->intval = POWER_SUPPLY_STATUS_FULL; 1025 else 1026 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 1027 break; 1028 case POWER_SUPPLY_PROP_MODEL_NAME: 1029 val->strval = bq->model; 1030 break; 1031 case POWER_SUPPLY_PROP_ONLINE: 1032 /* VBUS is present for all charging and fault states, 1033 * except the 'Ready' state. 1034 */ 1035 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS); 1036 if (ret < 0) 1037 return ret; 1038 val->intval = ret > 0; 1039 break; 1040 default: 1041 return -EINVAL; 1042 } 1043 return 0; 1044 } 1045 1046 static void bq2415x_power_supply_exit(struct bq2415x_device *bq) 1047 { 1048 bq->autotimer = 0; 1049 if (bq->automode > 0) 1050 bq->automode = 0; 1051 cancel_delayed_work_sync(&bq->work); 1052 power_supply_unregister(bq->charger); 1053 kfree(bq->model); 1054 } 1055 1056 /**** additional sysfs entries for power supply interface ****/ 1057 1058 /* show *_status entries */ 1059 static ssize_t bq2415x_sysfs_show_status(struct device *dev, 1060 struct device_attribute *attr, 1061 char *buf) 1062 { 1063 struct power_supply *psy = dev_to_psy(dev); 1064 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1065 enum bq2415x_command command; 1066 int ret; 1067 1068 if (strcmp(attr->attr.name, "otg_status") == 0) 1069 command = BQ2415X_OTG_STATUS; 1070 else if (strcmp(attr->attr.name, "charge_status") == 0) 1071 command = BQ2415X_CHARGE_STATUS; 1072 else if (strcmp(attr->attr.name, "boost_status") == 0) 1073 command = BQ2415X_BOOST_STATUS; 1074 else if (strcmp(attr->attr.name, "fault_status") == 0) 1075 command = BQ2415X_FAULT_STATUS; 1076 else 1077 return -EINVAL; 1078 1079 ret = bq2415x_exec_command(bq, command); 1080 if (ret < 0) 1081 return ret; 1082 return sysfs_emit(buf, "%d\n", ret); 1083 } 1084 1085 /* 1086 * set timer entry: 1087 * auto - enable auto mode 1088 * off - disable auto mode 1089 * (other values) - reset chip timer 1090 */ 1091 static ssize_t bq2415x_sysfs_set_timer(struct device *dev, 1092 struct device_attribute *attr, 1093 const char *buf, 1094 size_t count) 1095 { 1096 struct power_supply *psy = dev_to_psy(dev); 1097 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1098 int ret = 0; 1099 1100 if (strncmp(buf, "auto", 4) == 0) 1101 bq2415x_set_autotimer(bq, 1); 1102 else if (strncmp(buf, "off", 3) == 0) 1103 bq2415x_set_autotimer(bq, 0); 1104 else 1105 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET); 1106 1107 if (ret < 0) 1108 return ret; 1109 return count; 1110 } 1111 1112 /* show timer entry (auto or off) */ 1113 static ssize_t bq2415x_sysfs_show_timer(struct device *dev, 1114 struct device_attribute *attr, 1115 char *buf) 1116 { 1117 struct power_supply *psy = dev_to_psy(dev); 1118 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1119 1120 if (bq->timer_error) 1121 return sysfs_emit(buf, "%s\n", bq->timer_error); 1122 1123 if (bq->autotimer) 1124 return sysfs_emit(buf, "auto\n"); 1125 return sysfs_emit(buf, "off\n"); 1126 } 1127 1128 /* 1129 * set mode entry: 1130 * auto - if automode is supported, enable it and set mode to reported 1131 * none - disable charger and boost mode 1132 * host - charging mode for host/hub chargers (current limit 500mA) 1133 * dedicated - charging mode for dedicated chargers (unlimited current limit) 1134 * boost - disable charger and enable boost mode 1135 */ 1136 static ssize_t bq2415x_sysfs_set_mode(struct device *dev, 1137 struct device_attribute *attr, 1138 const char *buf, 1139 size_t count) 1140 { 1141 struct power_supply *psy = dev_to_psy(dev); 1142 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1143 enum bq2415x_mode mode; 1144 int ret = 0; 1145 1146 if (strncmp(buf, "auto", 4) == 0) { 1147 if (bq->automode < 0) 1148 return -EINVAL; 1149 bq->automode = 1; 1150 mode = bq->reported_mode; 1151 } else if (strncmp(buf, "off", 3) == 0) { 1152 if (bq->automode > 0) 1153 bq->automode = 0; 1154 mode = BQ2415X_MODE_OFF; 1155 } else if (strncmp(buf, "none", 4) == 0) { 1156 if (bq->automode > 0) 1157 bq->automode = 0; 1158 mode = BQ2415X_MODE_NONE; 1159 } else if (strncmp(buf, "host", 4) == 0) { 1160 if (bq->automode > 0) 1161 bq->automode = 0; 1162 mode = BQ2415X_MODE_HOST_CHARGER; 1163 } else if (strncmp(buf, "dedicated", 9) == 0) { 1164 if (bq->automode > 0) 1165 bq->automode = 0; 1166 mode = BQ2415X_MODE_DEDICATED_CHARGER; 1167 } else if (strncmp(buf, "boost", 5) == 0) { 1168 if (bq->automode > 0) 1169 bq->automode = 0; 1170 mode = BQ2415X_MODE_BOOST; 1171 } else if (strncmp(buf, "reset", 5) == 0) { 1172 bq2415x_reset_chip(bq); 1173 bq2415x_set_defaults(bq); 1174 if (bq->automode <= 0) 1175 return count; 1176 bq->automode = 1; 1177 mode = bq->reported_mode; 1178 } else { 1179 return -EINVAL; 1180 } 1181 1182 ret = bq2415x_set_mode(bq, mode); 1183 if (ret < 0) 1184 return ret; 1185 return count; 1186 } 1187 1188 /* show mode entry (auto, none, host, dedicated or boost) */ 1189 static ssize_t bq2415x_sysfs_show_mode(struct device *dev, 1190 struct device_attribute *attr, 1191 char *buf) 1192 { 1193 struct power_supply *psy = dev_to_psy(dev); 1194 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1195 ssize_t ret = 0; 1196 1197 if (bq->automode > 0) 1198 ret += sysfs_emit_at(buf, ret, "auto ("); 1199 1200 switch (bq->mode) { 1201 case BQ2415X_MODE_OFF: 1202 ret += sysfs_emit_at(buf, ret, "off"); 1203 break; 1204 case BQ2415X_MODE_NONE: 1205 ret += sysfs_emit_at(buf, ret, "none"); 1206 break; 1207 case BQ2415X_MODE_HOST_CHARGER: 1208 ret += sysfs_emit_at(buf, ret, "host"); 1209 break; 1210 case BQ2415X_MODE_DEDICATED_CHARGER: 1211 ret += sysfs_emit_at(buf, ret, "dedicated"); 1212 break; 1213 case BQ2415X_MODE_BOOST: 1214 ret += sysfs_emit_at(buf, ret, "boost"); 1215 break; 1216 } 1217 1218 if (bq->automode > 0) 1219 ret += sysfs_emit_at(buf, ret, ")"); 1220 1221 ret += sysfs_emit_at(buf, ret, "\n"); 1222 return ret; 1223 } 1224 1225 /* show reported_mode entry (none, host, dedicated or boost) */ 1226 static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev, 1227 struct device_attribute *attr, 1228 char *buf) 1229 { 1230 struct power_supply *psy = dev_to_psy(dev); 1231 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1232 1233 if (bq->automode < 0) 1234 return -EINVAL; 1235 1236 switch (bq->reported_mode) { 1237 case BQ2415X_MODE_OFF: 1238 return sysfs_emit(buf, "off\n"); 1239 case BQ2415X_MODE_NONE: 1240 return sysfs_emit(buf, "none\n"); 1241 case BQ2415X_MODE_HOST_CHARGER: 1242 return sysfs_emit(buf, "host\n"); 1243 case BQ2415X_MODE_DEDICATED_CHARGER: 1244 return sysfs_emit(buf, "dedicated\n"); 1245 case BQ2415X_MODE_BOOST: 1246 return sysfs_emit(buf, "boost\n"); 1247 } 1248 1249 return -EINVAL; 1250 } 1251 1252 /* directly set raw value to chip register, format: 'register value' */ 1253 static ssize_t bq2415x_sysfs_set_registers(struct device *dev, 1254 struct device_attribute *attr, 1255 const char *buf, 1256 size_t count) 1257 { 1258 struct power_supply *psy = dev_to_psy(dev); 1259 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1260 ssize_t ret = 0; 1261 unsigned int reg; 1262 unsigned int val; 1263 1264 if (sscanf(buf, "%x %x", ®, &val) != 2) 1265 return -EINVAL; 1266 1267 if (reg > 4 || val > 255) 1268 return -EINVAL; 1269 1270 ret = bq2415x_i2c_write(bq, reg, val); 1271 if (ret < 0) 1272 return ret; 1273 return count; 1274 } 1275 1276 /* print value of chip register, format: 'register=value' */ 1277 static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq, 1278 u8 reg, 1279 char *buf) 1280 { 1281 int ret = bq2415x_i2c_read(bq, reg); 1282 1283 if (ret < 0) 1284 return sysfs_emit(buf, "%#.2x=error %d\n", reg, ret); 1285 return sysfs_emit(buf, "%#.2x=%#.2x\n", reg, ret); 1286 } 1287 1288 /* show all raw values of chip register, format per line: 'register=value' */ 1289 static ssize_t bq2415x_sysfs_show_registers(struct device *dev, 1290 struct device_attribute *attr, 1291 char *buf) 1292 { 1293 struct power_supply *psy = dev_to_psy(dev); 1294 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1295 ssize_t ret = 0; 1296 1297 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret); 1298 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret); 1299 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret); 1300 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret); 1301 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret); 1302 return ret; 1303 } 1304 1305 /* set current and voltage limit entries (in mA or mV) */ 1306 static ssize_t bq2415x_sysfs_set_limit(struct device *dev, 1307 struct device_attribute *attr, 1308 const char *buf, 1309 size_t count) 1310 { 1311 struct power_supply *psy = dev_to_psy(dev); 1312 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1313 long val; 1314 int ret; 1315 1316 if (kstrtol(buf, 10, &val) < 0) 1317 return -EINVAL; 1318 1319 if (strcmp(attr->attr.name, "current_limit") == 0) 1320 ret = bq2415x_set_current_limit(bq, val); 1321 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0) 1322 ret = bq2415x_set_weak_battery_voltage(bq, val); 1323 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0) 1324 ret = bq2415x_set_battery_regulation_voltage(bq, val); 1325 else if (strcmp(attr->attr.name, "charge_current") == 0) 1326 ret = bq2415x_set_charge_current(bq, val); 1327 else if (strcmp(attr->attr.name, "termination_current") == 0) 1328 ret = bq2415x_set_termination_current(bq, val); 1329 else 1330 return -EINVAL; 1331 1332 if (ret < 0) 1333 return ret; 1334 return count; 1335 } 1336 1337 /* show current and voltage limit entries (in mA or mV) */ 1338 static ssize_t bq2415x_sysfs_show_limit(struct device *dev, 1339 struct device_attribute *attr, 1340 char *buf) 1341 { 1342 struct power_supply *psy = dev_to_psy(dev); 1343 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1344 int ret; 1345 1346 if (strcmp(attr->attr.name, "current_limit") == 0) 1347 ret = bq2415x_get_current_limit(bq); 1348 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0) 1349 ret = bq2415x_get_weak_battery_voltage(bq); 1350 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0) 1351 ret = bq2415x_get_battery_regulation_voltage(bq); 1352 else if (strcmp(attr->attr.name, "charge_current") == 0) 1353 ret = bq2415x_get_charge_current(bq); 1354 else if (strcmp(attr->attr.name, "termination_current") == 0) 1355 ret = bq2415x_get_termination_current(bq); 1356 else 1357 return -EINVAL; 1358 1359 if (ret < 0) 1360 return ret; 1361 return sysfs_emit(buf, "%d\n", ret); 1362 } 1363 1364 /* set *_enable entries */ 1365 static ssize_t bq2415x_sysfs_set_enable(struct device *dev, 1366 struct device_attribute *attr, 1367 const char *buf, 1368 size_t count) 1369 { 1370 struct power_supply *psy = dev_to_psy(dev); 1371 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1372 enum bq2415x_command command; 1373 long val; 1374 int ret; 1375 1376 if (kstrtol(buf, 10, &val) < 0) 1377 return -EINVAL; 1378 1379 if (strcmp(attr->attr.name, "charge_termination_enable") == 0) 1380 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE : 1381 BQ2415X_CHARGE_TERMINATION_DISABLE; 1382 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0) 1383 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE : 1384 BQ2415X_HIGH_IMPEDANCE_DISABLE; 1385 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0) 1386 command = val ? BQ2415X_OTG_PIN_ENABLE : 1387 BQ2415X_OTG_PIN_DISABLE; 1388 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0) 1389 command = val ? BQ2415X_STAT_PIN_ENABLE : 1390 BQ2415X_STAT_PIN_DISABLE; 1391 else 1392 return -EINVAL; 1393 1394 ret = bq2415x_exec_command(bq, command); 1395 if (ret < 0) 1396 return ret; 1397 return count; 1398 } 1399 1400 /* show *_enable entries */ 1401 static ssize_t bq2415x_sysfs_show_enable(struct device *dev, 1402 struct device_attribute *attr, 1403 char *buf) 1404 { 1405 struct power_supply *psy = dev_to_psy(dev); 1406 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1407 enum bq2415x_command command; 1408 int ret; 1409 1410 if (strcmp(attr->attr.name, "charge_termination_enable") == 0) 1411 command = BQ2415X_CHARGE_TERMINATION_STATUS; 1412 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0) 1413 command = BQ2415X_HIGH_IMPEDANCE_STATUS; 1414 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0) 1415 command = BQ2415X_OTG_PIN_STATUS; 1416 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0) 1417 command = BQ2415X_STAT_PIN_STATUS; 1418 else 1419 return -EINVAL; 1420 1421 ret = bq2415x_exec_command(bq, command); 1422 if (ret < 0) 1423 return ret; 1424 return sysfs_emit(buf, "%d\n", ret); 1425 } 1426 1427 static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO, 1428 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1429 static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO, 1430 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1431 static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO, 1432 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1433 static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO, 1434 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1435 static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO, 1436 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1437 1438 static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO, 1439 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1440 static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO, 1441 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1442 static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO, 1443 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1444 static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO, 1445 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1446 1447 static DEVICE_ATTR(reported_mode, S_IRUGO, 1448 bq2415x_sysfs_show_reported_mode, NULL); 1449 static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, 1450 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode); 1451 static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO, 1452 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer); 1453 1454 static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO, 1455 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers); 1456 1457 static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1458 static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1459 static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1460 static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1461 1462 static struct attribute *bq2415x_sysfs_attrs[] = { 1463 /* 1464 * TODO: some (appropriate) of these attrs should be switched to 1465 * use power supply class props. 1466 */ 1467 &dev_attr_current_limit.attr, 1468 &dev_attr_weak_battery_voltage.attr, 1469 &dev_attr_battery_regulation_voltage.attr, 1470 &dev_attr_charge_current.attr, 1471 &dev_attr_termination_current.attr, 1472 1473 &dev_attr_charge_termination_enable.attr, 1474 &dev_attr_high_impedance_enable.attr, 1475 &dev_attr_otg_pin_enable.attr, 1476 &dev_attr_stat_pin_enable.attr, 1477 1478 &dev_attr_reported_mode.attr, 1479 &dev_attr_mode.attr, 1480 &dev_attr_timer.attr, 1481 1482 &dev_attr_registers.attr, 1483 1484 &dev_attr_otg_status.attr, 1485 &dev_attr_charge_status.attr, 1486 &dev_attr_boost_status.attr, 1487 &dev_attr_fault_status.attr, 1488 NULL, 1489 }; 1490 1491 ATTRIBUTE_GROUPS(bq2415x_sysfs); 1492 1493 static int bq2415x_power_supply_init(struct bq2415x_device *bq) 1494 { 1495 int ret; 1496 int chip; 1497 char revstr[8]; 1498 struct power_supply_config psy_cfg = { 1499 .drv_data = bq, 1500 .of_node = bq->dev->of_node, 1501 .attr_grp = bq2415x_sysfs_groups, 1502 }; 1503 1504 bq->charger_desc.name = bq->name; 1505 bq->charger_desc.type = POWER_SUPPLY_TYPE_USB; 1506 bq->charger_desc.properties = bq2415x_power_supply_props; 1507 bq->charger_desc.num_properties = 1508 ARRAY_SIZE(bq2415x_power_supply_props); 1509 bq->charger_desc.get_property = bq2415x_power_supply_get_property; 1510 1511 ret = bq2415x_detect_chip(bq); 1512 if (ret < 0) 1513 chip = BQUNKNOWN; 1514 else 1515 chip = ret; 1516 1517 ret = bq2415x_detect_revision(bq); 1518 if (ret < 0) 1519 strcpy(revstr, "unknown"); 1520 else 1521 sprintf(revstr, "1.%d", ret); 1522 1523 bq->model = kasprintf(GFP_KERNEL, 1524 "chip %s, revision %s, vender code %.3d", 1525 bq2415x_chip_name[chip], revstr, 1526 bq2415x_get_vender_code(bq)); 1527 if (!bq->model) { 1528 dev_err(bq->dev, "failed to allocate model name\n"); 1529 return -ENOMEM; 1530 } 1531 1532 bq->charger = power_supply_register(bq->dev, &bq->charger_desc, 1533 &psy_cfg); 1534 if (IS_ERR(bq->charger)) { 1535 kfree(bq->model); 1536 return PTR_ERR(bq->charger); 1537 } 1538 1539 return 0; 1540 } 1541 1542 /* main bq2415x probe function */ 1543 static int bq2415x_probe(struct i2c_client *client) 1544 { 1545 const struct i2c_device_id *id = i2c_client_get_device_id(client); 1546 int ret; 1547 int num; 1548 char *name = NULL; 1549 struct bq2415x_device *bq; 1550 struct device_node *np = client->dev.of_node; 1551 struct bq2415x_platform_data *pdata = client->dev.platform_data; 1552 const struct acpi_device_id *acpi_id = NULL; 1553 struct power_supply *notify_psy = NULL; 1554 union power_supply_propval prop; 1555 1556 if (!np && !pdata && !ACPI_HANDLE(&client->dev)) { 1557 dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n"); 1558 return -ENODEV; 1559 } 1560 1561 /* Get new ID for the new device */ 1562 mutex_lock(&bq2415x_id_mutex); 1563 num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL); 1564 mutex_unlock(&bq2415x_id_mutex); 1565 if (num < 0) 1566 return num; 1567 1568 if (id) { 1569 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); 1570 } else if (ACPI_HANDLE(&client->dev)) { 1571 acpi_id = 1572 acpi_match_device(client->dev.driver->acpi_match_table, 1573 &client->dev); 1574 if (!acpi_id) { 1575 dev_err(&client->dev, "failed to match device name\n"); 1576 ret = -ENODEV; 1577 goto error_1; 1578 } 1579 name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num); 1580 } 1581 if (!name) { 1582 dev_err(&client->dev, "failed to allocate device name\n"); 1583 ret = -ENOMEM; 1584 goto error_1; 1585 } 1586 1587 bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL); 1588 if (!bq) { 1589 ret = -ENOMEM; 1590 goto error_2; 1591 } 1592 1593 i2c_set_clientdata(client, bq); 1594 1595 bq->id = num; 1596 bq->dev = &client->dev; 1597 if (id) 1598 bq->chip = id->driver_data; 1599 else if (ACPI_HANDLE(bq->dev)) 1600 bq->chip = acpi_id->driver_data; 1601 bq->name = name; 1602 bq->mode = BQ2415X_MODE_OFF; 1603 bq->reported_mode = BQ2415X_MODE_OFF; 1604 bq->autotimer = 0; 1605 bq->automode = 0; 1606 1607 if (np || ACPI_HANDLE(bq->dev)) { 1608 ret = device_property_read_u32(bq->dev, 1609 "ti,current-limit", 1610 &bq->init_data.current_limit); 1611 if (ret) 1612 goto error_2; 1613 ret = device_property_read_u32(bq->dev, 1614 "ti,weak-battery-voltage", 1615 &bq->init_data.weak_battery_voltage); 1616 if (ret) 1617 goto error_2; 1618 ret = device_property_read_u32(bq->dev, 1619 "ti,battery-regulation-voltage", 1620 &bq->init_data.battery_regulation_voltage); 1621 if (ret) 1622 goto error_2; 1623 ret = device_property_read_u32(bq->dev, 1624 "ti,charge-current", 1625 &bq->init_data.charge_current); 1626 if (ret) 1627 goto error_2; 1628 ret = device_property_read_u32(bq->dev, 1629 "ti,termination-current", 1630 &bq->init_data.termination_current); 1631 if (ret) 1632 goto error_2; 1633 ret = device_property_read_u32(bq->dev, 1634 "ti,resistor-sense", 1635 &bq->init_data.resistor_sense); 1636 if (ret) 1637 goto error_2; 1638 if (np) 1639 bq->notify_node = of_parse_phandle(np, 1640 "ti,usb-charger-detection", 0); 1641 } else { 1642 memcpy(&bq->init_data, pdata, sizeof(bq->init_data)); 1643 } 1644 1645 bq2415x_reset_chip(bq); 1646 1647 ret = bq2415x_power_supply_init(bq); 1648 if (ret) { 1649 dev_err(bq->dev, "failed to register power supply: %d\n", ret); 1650 goto error_2; 1651 } 1652 1653 ret = bq2415x_set_defaults(bq); 1654 if (ret) { 1655 dev_err(bq->dev, "failed to set default values: %d\n", ret); 1656 goto error_3; 1657 } 1658 1659 if (bq->notify_node || bq->init_data.notify_device) { 1660 bq->nb.notifier_call = bq2415x_notifier_call; 1661 ret = power_supply_reg_notifier(&bq->nb); 1662 if (ret) { 1663 dev_err(bq->dev, "failed to reg notifier: %d\n", ret); 1664 goto error_3; 1665 } 1666 1667 bq->automode = 1; 1668 dev_info(bq->dev, "automode supported, waiting for events\n"); 1669 } else { 1670 bq->automode = -1; 1671 dev_info(bq->dev, "automode not supported\n"); 1672 } 1673 1674 /* Query for initial reported_mode and set it */ 1675 if (bq->nb.notifier_call) { 1676 if (np) { 1677 notify_psy = power_supply_get_by_phandle(np, 1678 "ti,usb-charger-detection"); 1679 if (IS_ERR(notify_psy)) 1680 notify_psy = NULL; 1681 } else if (bq->init_data.notify_device) { 1682 notify_psy = power_supply_get_by_name( 1683 bq->init_data.notify_device); 1684 } 1685 } 1686 if (notify_psy) { 1687 ret = power_supply_get_property(notify_psy, 1688 POWER_SUPPLY_PROP_CURRENT_MAX, &prop); 1689 power_supply_put(notify_psy); 1690 1691 if (ret == 0) { 1692 bq2415x_update_reported_mode(bq, prop.intval); 1693 bq2415x_set_mode(bq, bq->reported_mode); 1694 } 1695 } 1696 1697 INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work); 1698 bq2415x_set_autotimer(bq, 1); 1699 1700 dev_info(bq->dev, "driver registered\n"); 1701 return 0; 1702 1703 error_3: 1704 bq2415x_power_supply_exit(bq); 1705 error_2: 1706 if (bq) 1707 of_node_put(bq->notify_node); 1708 kfree(name); 1709 error_1: 1710 mutex_lock(&bq2415x_id_mutex); 1711 idr_remove(&bq2415x_id, num); 1712 mutex_unlock(&bq2415x_id_mutex); 1713 1714 return ret; 1715 } 1716 1717 /* main bq2415x remove function */ 1718 1719 static void bq2415x_remove(struct i2c_client *client) 1720 { 1721 struct bq2415x_device *bq = i2c_get_clientdata(client); 1722 1723 if (bq->nb.notifier_call) 1724 power_supply_unreg_notifier(&bq->nb); 1725 1726 of_node_put(bq->notify_node); 1727 bq2415x_power_supply_exit(bq); 1728 1729 bq2415x_reset_chip(bq); 1730 1731 mutex_lock(&bq2415x_id_mutex); 1732 idr_remove(&bq2415x_id, bq->id); 1733 mutex_unlock(&bq2415x_id_mutex); 1734 1735 dev_info(bq->dev, "driver unregistered\n"); 1736 1737 kfree(bq->name); 1738 } 1739 1740 static const struct i2c_device_id bq2415x_i2c_id_table[] = { 1741 { "bq2415x", BQUNKNOWN }, 1742 { "bq24150", BQ24150 }, 1743 { "bq24150a", BQ24150A }, 1744 { "bq24151", BQ24151 }, 1745 { "bq24151a", BQ24151A }, 1746 { "bq24152", BQ24152 }, 1747 { "bq24153", BQ24153 }, 1748 { "bq24153a", BQ24153A }, 1749 { "bq24155", BQ24155 }, 1750 { "bq24156", BQ24156 }, 1751 { "bq24156a", BQ24156A }, 1752 { "bq24157s", BQ24157S }, 1753 { "bq24158", BQ24158 }, 1754 {}, 1755 }; 1756 MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table); 1757 1758 #ifdef CONFIG_ACPI 1759 static const struct acpi_device_id bq2415x_i2c_acpi_match[] = { 1760 { "BQ2415X", BQUNKNOWN }, 1761 { "BQ241500", BQ24150 }, 1762 { "BQA24150", BQ24150A }, 1763 { "BQ241510", BQ24151 }, 1764 { "BQA24151", BQ24151A }, 1765 { "BQ241520", BQ24152 }, 1766 { "BQ241530", BQ24153 }, 1767 { "BQA24153", BQ24153A }, 1768 { "BQ241550", BQ24155 }, 1769 { "BQ241560", BQ24156 }, 1770 { "BQA24156", BQ24156A }, 1771 { "BQS24157", BQ24157S }, 1772 { "BQ241580", BQ24158 }, 1773 {}, 1774 }; 1775 MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match); 1776 #endif 1777 1778 #ifdef CONFIG_OF 1779 static const struct of_device_id bq2415x_of_match_table[] = { 1780 { .compatible = "ti,bq24150" }, 1781 { .compatible = "ti,bq24150a" }, 1782 { .compatible = "ti,bq24151" }, 1783 { .compatible = "ti,bq24151a" }, 1784 { .compatible = "ti,bq24152" }, 1785 { .compatible = "ti,bq24153" }, 1786 { .compatible = "ti,bq24153a" }, 1787 { .compatible = "ti,bq24155" }, 1788 { .compatible = "ti,bq24156" }, 1789 { .compatible = "ti,bq24156a" }, 1790 { .compatible = "ti,bq24157s" }, 1791 { .compatible = "ti,bq24158" }, 1792 {}, 1793 }; 1794 MODULE_DEVICE_TABLE(of, bq2415x_of_match_table); 1795 #endif 1796 1797 static struct i2c_driver bq2415x_driver = { 1798 .driver = { 1799 .name = "bq2415x-charger", 1800 .of_match_table = of_match_ptr(bq2415x_of_match_table), 1801 .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match), 1802 }, 1803 .probe = bq2415x_probe, 1804 .remove = bq2415x_remove, 1805 .id_table = bq2415x_i2c_id_table, 1806 }; 1807 module_i2c_driver(bq2415x_driver); 1808 1809 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>"); 1810 MODULE_DESCRIPTION("bq2415x charger driver"); 1811 MODULE_LICENSE("GPL"); 1812