1/* 2 * bq2415x charger driver 3 * 4 * Copyright (C) 2011-2013 Pali Roh��r <pali.rohar@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * Datasheets: 17 * http://www.ti.com/product/bq24150 18 * http://www.ti.com/product/bq24150a 19 * http://www.ti.com/product/bq24152 20 * http://www.ti.com/product/bq24153 21 * http://www.ti.com/product/bq24153a 22 * http://www.ti.com/product/bq24155 23 * http://www.ti.com/product/bq24157s 24 * http://www.ti.com/product/bq24158 25 */ 26 27#include <linux/kernel.h> 28#include <linux/module.h> 29#include <linux/param.h> 30#include <linux/err.h> 31#include <linux/workqueue.h> 32#include <linux/sysfs.h> 33#include <linux/platform_device.h> 34#include <linux/power_supply.h> 35#include <linux/idr.h> 36#include <linux/i2c.h> 37#include <linux/slab.h> 38#include <linux/acpi.h> 39 40#include <linux/power/bq2415x_charger.h> 41 42/* timeout for resetting chip timer */ 43#define BQ2415X_TIMER_TIMEOUT 10 44 45#define BQ2415X_REG_STATUS 0x00 46#define BQ2415X_REG_CONTROL 0x01 47#define BQ2415X_REG_VOLTAGE 0x02 48#define BQ2415X_REG_VENDER 0x03 49#define BQ2415X_REG_CURRENT 0x04 50 51/* reset state for all registers */ 52#define BQ2415X_RESET_STATUS BIT(6) 53#define BQ2415X_RESET_CONTROL (BIT(4)|BIT(5)) 54#define BQ2415X_RESET_VOLTAGE (BIT(1)|BIT(3)) 55#define BQ2415X_RESET_CURRENT (BIT(0)|BIT(3)|BIT(7)) 56 57/* status register */ 58#define BQ2415X_BIT_TMR_RST 7 59#define BQ2415X_BIT_OTG 7 60#define BQ2415X_BIT_EN_STAT 6 61#define BQ2415X_MASK_STAT (BIT(4)|BIT(5)) 62#define BQ2415X_SHIFT_STAT 4 63#define BQ2415X_BIT_BOOST 3 64#define BQ2415X_MASK_FAULT (BIT(0)|BIT(1)|BIT(2)) 65#define BQ2415X_SHIFT_FAULT 0 66 67/* control register */ 68#define BQ2415X_MASK_LIMIT (BIT(6)|BIT(7)) 69#define BQ2415X_SHIFT_LIMIT 6 70#define BQ2415X_MASK_VLOWV (BIT(4)|BIT(5)) 71#define BQ2415X_SHIFT_VLOWV 4 72#define BQ2415X_BIT_TE 3 73#define BQ2415X_BIT_CE 2 74#define BQ2415X_BIT_HZ_MODE 1 75#define BQ2415X_BIT_OPA_MODE 0 76 77/* voltage register */ 78#define BQ2415X_MASK_VO (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7)) 79#define BQ2415X_SHIFT_VO 2 80#define BQ2415X_BIT_OTG_PL 1 81#define BQ2415X_BIT_OTG_EN 0 82 83/* vender register */ 84#define BQ2415X_MASK_VENDER (BIT(5)|BIT(6)|BIT(7)) 85#define BQ2415X_SHIFT_VENDER 5 86#define BQ2415X_MASK_PN (BIT(3)|BIT(4)) 87#define BQ2415X_SHIFT_PN 3 88#define BQ2415X_MASK_REVISION (BIT(0)|BIT(1)|BIT(2)) 89#define BQ2415X_SHIFT_REVISION 0 90 91/* current register */ 92#define BQ2415X_MASK_RESET BIT(7) 93#define BQ2415X_MASK_VI_CHRG (BIT(4)|BIT(5)|BIT(6)) 94#define BQ2415X_SHIFT_VI_CHRG 4 95/* N/A BIT(3) */ 96#define BQ2415X_MASK_VI_TERM (BIT(0)|BIT(1)|BIT(2)) 97#define BQ2415X_SHIFT_VI_TERM 0 98 99 100enum bq2415x_command { 101 BQ2415X_TIMER_RESET, 102 BQ2415X_OTG_STATUS, 103 BQ2415X_STAT_PIN_STATUS, 104 BQ2415X_STAT_PIN_ENABLE, 105 BQ2415X_STAT_PIN_DISABLE, 106 BQ2415X_CHARGE_STATUS, 107 BQ2415X_BOOST_STATUS, 108 BQ2415X_FAULT_STATUS, 109 110 BQ2415X_CHARGE_TERMINATION_STATUS, 111 BQ2415X_CHARGE_TERMINATION_ENABLE, 112 BQ2415X_CHARGE_TERMINATION_DISABLE, 113 BQ2415X_CHARGER_STATUS, 114 BQ2415X_CHARGER_ENABLE, 115 BQ2415X_CHARGER_DISABLE, 116 BQ2415X_HIGH_IMPEDANCE_STATUS, 117 BQ2415X_HIGH_IMPEDANCE_ENABLE, 118 BQ2415X_HIGH_IMPEDANCE_DISABLE, 119 BQ2415X_BOOST_MODE_STATUS, 120 BQ2415X_BOOST_MODE_ENABLE, 121 BQ2415X_BOOST_MODE_DISABLE, 122 123 BQ2415X_OTG_LEVEL, 124 BQ2415X_OTG_ACTIVATE_HIGH, 125 BQ2415X_OTG_ACTIVATE_LOW, 126 BQ2415X_OTG_PIN_STATUS, 127 BQ2415X_OTG_PIN_ENABLE, 128 BQ2415X_OTG_PIN_DISABLE, 129 130 BQ2415X_VENDER_CODE, 131 BQ2415X_PART_NUMBER, 132 BQ2415X_REVISION, 133}; 134 135enum bq2415x_chip { 136 BQUNKNOWN, 137 BQ24150, 138 BQ24150A, 139 BQ24151, 140 BQ24151A, 141 BQ24152, 142 BQ24153, 143 BQ24153A, 144 BQ24155, 145 BQ24156, 146 BQ24156A, 147 BQ24157S, 148 BQ24158, 149}; 150 151static char *bq2415x_chip_name[] = { 152 "unknown", 153 "bq24150", 154 "bq24150a", 155 "bq24151", 156 "bq24151a", 157 "bq24152", 158 "bq24153", 159 "bq24153a", 160 "bq24155", 161 "bq24156", 162 "bq24156a", 163 "bq24157s", 164 "bq24158", 165}; 166 167struct bq2415x_device { 168 struct device *dev; 169 struct bq2415x_platform_data init_data; 170 struct power_supply *charger; 171 struct power_supply_desc charger_desc; 172 struct delayed_work work; 173 struct device_node *notify_node; 174 struct notifier_block nb; 175 enum bq2415x_mode reported_mode;/* mode reported by hook function */ 176 enum bq2415x_mode mode; /* currently configured mode */ 177 enum bq2415x_chip chip; 178 const char *timer_error; 179 char *model; 180 char *name; 181 int autotimer; /* 1 - if driver automatically reset timer, 0 - not */ 182 int automode; /* 1 - enabled, 0 - disabled; -1 - not supported */ 183 int id; 184}; 185 186/* each registered chip must have unique id */ 187static DEFINE_IDR(bq2415x_id); 188 189static DEFINE_MUTEX(bq2415x_id_mutex); 190static DEFINE_MUTEX(bq2415x_timer_mutex); 191static DEFINE_MUTEX(bq2415x_i2c_mutex); 192 193/**** i2c read functions ****/ 194 195/* read value from register */ 196static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg) 197{ 198 struct i2c_client *client = to_i2c_client(bq->dev); 199 struct i2c_msg msg[2]; 200 u8 val; 201 int ret; 202 203 if (!client->adapter) 204 return -ENODEV; 205 206 msg[0].addr = client->addr; 207 msg[0].flags = 0; 208 msg[0].buf = ® 209 msg[0].len = sizeof(reg); 210 msg[1].addr = client->addr; 211 msg[1].flags = I2C_M_RD; 212 msg[1].buf = &val; 213 msg[1].len = sizeof(val); 214 215 mutex_lock(&bq2415x_i2c_mutex); 216 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); 217 mutex_unlock(&bq2415x_i2c_mutex); 218 219 if (ret < 0) 220 return ret; 221 222 return val; 223} 224 225/* read value from register, apply mask and right shift it */ 226static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg, 227 u8 mask, u8 shift) 228{ 229 int ret; 230 231 if (shift > 8) 232 return -EINVAL; 233 234 ret = bq2415x_i2c_read(bq, reg); 235 if (ret < 0) 236 return ret; 237 return (ret & mask) >> shift; 238} 239 240/* read value from register and return one specified bit */ 241static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit) 242{ 243 if (bit > 8) 244 return -EINVAL; 245 return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit); 246} 247 248/**** i2c write functions ****/ 249 250/* write value to register */ 251static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val) 252{ 253 struct i2c_client *client = to_i2c_client(bq->dev); 254 struct i2c_msg msg[1]; 255 u8 data[2]; 256 int ret; 257 258 data[0] = reg; 259 data[1] = val; 260 261 msg[0].addr = client->addr; 262 msg[0].flags = 0; 263 msg[0].buf = data; 264 msg[0].len = ARRAY_SIZE(data); 265 266 mutex_lock(&bq2415x_i2c_mutex); 267 ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); 268 mutex_unlock(&bq2415x_i2c_mutex); 269 270 /* i2c_transfer returns number of messages transferred */ 271 if (ret < 0) 272 return ret; 273 else if (ret != 1) 274 return -EIO; 275 276 return 0; 277} 278 279/* read value from register, change it with mask left shifted and write back */ 280static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val, 281 u8 mask, u8 shift) 282{ 283 int ret; 284 285 if (shift > 8) 286 return -EINVAL; 287 288 ret = bq2415x_i2c_read(bq, reg); 289 if (ret < 0) 290 return ret; 291 292 ret &= ~mask; 293 ret |= val << shift; 294 295 return bq2415x_i2c_write(bq, reg, ret); 296} 297 298/* change only one bit in register */ 299static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg, 300 bool val, u8 bit) 301{ 302 if (bit > 8) 303 return -EINVAL; 304 return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit); 305} 306 307/**** global functions ****/ 308 309/* exec command function */ 310static int bq2415x_exec_command(struct bq2415x_device *bq, 311 enum bq2415x_command command) 312{ 313 int ret; 314 315 switch (command) { 316 case BQ2415X_TIMER_RESET: 317 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 318 1, BQ2415X_BIT_TMR_RST); 319 case BQ2415X_OTG_STATUS: 320 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS, 321 BQ2415X_BIT_OTG); 322 case BQ2415X_STAT_PIN_STATUS: 323 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS, 324 BQ2415X_BIT_EN_STAT); 325 case BQ2415X_STAT_PIN_ENABLE: 326 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1, 327 BQ2415X_BIT_EN_STAT); 328 case BQ2415X_STAT_PIN_DISABLE: 329 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0, 330 BQ2415X_BIT_EN_STAT); 331 case BQ2415X_CHARGE_STATUS: 332 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS, 333 BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT); 334 case BQ2415X_BOOST_STATUS: 335 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS, 336 BQ2415X_BIT_BOOST); 337 case BQ2415X_FAULT_STATUS: 338 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS, 339 BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT); 340 341 case BQ2415X_CHARGE_TERMINATION_STATUS: 342 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 343 BQ2415X_BIT_TE); 344 case BQ2415X_CHARGE_TERMINATION_ENABLE: 345 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 346 1, BQ2415X_BIT_TE); 347 case BQ2415X_CHARGE_TERMINATION_DISABLE: 348 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 349 0, BQ2415X_BIT_TE); 350 case BQ2415X_CHARGER_STATUS: 351 ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 352 BQ2415X_BIT_CE); 353 if (ret < 0) 354 return ret; 355 return ret > 0 ? 0 : 1; 356 case BQ2415X_CHARGER_ENABLE: 357 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 358 0, BQ2415X_BIT_CE); 359 case BQ2415X_CHARGER_DISABLE: 360 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 361 1, BQ2415X_BIT_CE); 362 case BQ2415X_HIGH_IMPEDANCE_STATUS: 363 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 364 BQ2415X_BIT_HZ_MODE); 365 case BQ2415X_HIGH_IMPEDANCE_ENABLE: 366 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 367 1, BQ2415X_BIT_HZ_MODE); 368 case BQ2415X_HIGH_IMPEDANCE_DISABLE: 369 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 370 0, BQ2415X_BIT_HZ_MODE); 371 case BQ2415X_BOOST_MODE_STATUS: 372 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL, 373 BQ2415X_BIT_OPA_MODE); 374 case BQ2415X_BOOST_MODE_ENABLE: 375 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 376 1, BQ2415X_BIT_OPA_MODE); 377 case BQ2415X_BOOST_MODE_DISABLE: 378 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL, 379 0, BQ2415X_BIT_OPA_MODE); 380 381 case BQ2415X_OTG_LEVEL: 382 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE, 383 BQ2415X_BIT_OTG_PL); 384 case BQ2415X_OTG_ACTIVATE_HIGH: 385 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 386 1, BQ2415X_BIT_OTG_PL); 387 case BQ2415X_OTG_ACTIVATE_LOW: 388 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 389 0, BQ2415X_BIT_OTG_PL); 390 case BQ2415X_OTG_PIN_STATUS: 391 return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE, 392 BQ2415X_BIT_OTG_EN); 393 case BQ2415X_OTG_PIN_ENABLE: 394 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 395 1, BQ2415X_BIT_OTG_EN); 396 case BQ2415X_OTG_PIN_DISABLE: 397 return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE, 398 0, BQ2415X_BIT_OTG_EN); 399 400 case BQ2415X_VENDER_CODE: 401 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER, 402 BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER); 403 case BQ2415X_PART_NUMBER: 404 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER, 405 BQ2415X_MASK_PN, BQ2415X_SHIFT_PN); 406 case BQ2415X_REVISION: 407 return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER, 408 BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION); 409 } 410 return -EINVAL; 411} 412 413/* detect chip type */ 414static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq) 415{ 416 struct i2c_client *client = to_i2c_client(bq->dev); 417 int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER); 418 419 if (ret < 0) 420 return ret; 421 422 switch (client->addr) { 423 case 0x6b: 424 switch (ret) { 425 case 0: 426 if (bq->chip == BQ24151A) 427 return bq->chip; 428 return BQ24151; 429 case 1: 430 if (bq->chip == BQ24150A || 431 bq->chip == BQ24152 || 432 bq->chip == BQ24155) 433 return bq->chip; 434 return BQ24150; 435 case 2: 436 if (bq->chip == BQ24153A) 437 return bq->chip; 438 return BQ24153; 439 default: 440 return BQUNKNOWN; 441 } 442 break; 443 444 case 0x6a: 445 switch (ret) { 446 case 0: 447 if (bq->chip == BQ24156A) 448 return bq->chip; 449 return BQ24156; 450 case 2: 451 if (bq->chip == BQ24157S) 452 return bq->chip; 453 return BQ24158; 454 default: 455 return BQUNKNOWN; 456 } 457 break; 458 } 459 460 return BQUNKNOWN; 461} 462 463/* detect chip revision */ 464static int bq2415x_detect_revision(struct bq2415x_device *bq) 465{ 466 int ret = bq2415x_exec_command(bq, BQ2415X_REVISION); 467 int chip = bq2415x_detect_chip(bq); 468 469 if (ret < 0 || chip < 0) 470 return -1; 471 472 switch (chip) { 473 case BQ24150: 474 case BQ24150A: 475 case BQ24151: 476 case BQ24151A: 477 case BQ24152: 478 if (ret >= 0 && ret <= 3) 479 return ret; 480 return -1; 481 case BQ24153: 482 case BQ24153A: 483 case BQ24156: 484 case BQ24156A: 485 case BQ24157S: 486 case BQ24158: 487 if (ret == 3) 488 return 0; 489 else if (ret == 1) 490 return 1; 491 return -1; 492 case BQ24155: 493 if (ret == 3) 494 return 3; 495 return -1; 496 case BQUNKNOWN: 497 return -1; 498 } 499 500 return -1; 501} 502 503/* return chip vender code */ 504static int bq2415x_get_vender_code(struct bq2415x_device *bq) 505{ 506 int ret; 507 508 ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE); 509 if (ret < 0) 510 return 0; 511 512 /* convert to binary */ 513 return (ret & 0x1) + 514 ((ret >> 1) & 0x1) * 10 + 515 ((ret >> 2) & 0x1) * 100; 516} 517 518/* reset all chip registers to default state */ 519static void bq2415x_reset_chip(struct bq2415x_device *bq) 520{ 521 bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT); 522 bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE); 523 bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL); 524 bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS); 525 bq->timer_error = NULL; 526} 527 528/**** properties functions ****/ 529 530/* set current limit in mA */ 531static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA) 532{ 533 int val; 534 535 if (mA <= 100) 536 val = 0; 537 else if (mA <= 500) 538 val = 1; 539 else if (mA <= 800) 540 val = 2; 541 else 542 val = 3; 543 544 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val, 545 BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT); 546} 547 548/* get current limit in mA */ 549static int bq2415x_get_current_limit(struct bq2415x_device *bq) 550{ 551 int ret; 552 553 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL, 554 BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT); 555 if (ret < 0) 556 return ret; 557 else if (ret == 0) 558 return 100; 559 else if (ret == 1) 560 return 500; 561 else if (ret == 2) 562 return 800; 563 else if (ret == 3) 564 return 1800; 565 return -EINVAL; 566} 567 568/* set weak battery voltage in mV */ 569static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV) 570{ 571 int val; 572 573 /* round to 100mV */ 574 if (mV <= 3400 + 50) 575 val = 0; 576 else if (mV <= 3500 + 50) 577 val = 1; 578 else if (mV <= 3600 + 50) 579 val = 2; 580 else 581 val = 3; 582 583 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val, 584 BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV); 585} 586 587/* get weak battery voltage in mV */ 588static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq) 589{ 590 int ret; 591 592 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL, 593 BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV); 594 if (ret < 0) 595 return ret; 596 return 100 * (34 + ret); 597} 598 599/* set battery regulation voltage in mV */ 600static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq, 601 int mV) 602{ 603 int val = (mV/10 - 350) / 2; 604 605 /* 606 * According to datasheet, maximum battery regulation voltage is 607 * 4440mV which is b101111 = 47. 608 */ 609 if (val < 0) 610 val = 0; 611 else if (val > 47) 612 return -EINVAL; 613 614 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val, 615 BQ2415X_MASK_VO, BQ2415X_SHIFT_VO); 616} 617 618/* get battery regulation voltage in mV */ 619static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq) 620{ 621 int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE, 622 BQ2415X_MASK_VO, BQ2415X_SHIFT_VO); 623 624 if (ret < 0) 625 return ret; 626 return 10 * (350 + 2*ret); 627} 628 629/* set charge current in mA (platform data must provide resistor sense) */ 630static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA) 631{ 632 int val; 633 634 if (bq->init_data.resistor_sense <= 0) 635 return -EINVAL; 636 637 val = (mA * bq->init_data.resistor_sense - 37400) / 6800; 638 if (val < 0) 639 val = 0; 640 else if (val > 7) 641 val = 7; 642 643 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val, 644 BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET, 645 BQ2415X_SHIFT_VI_CHRG); 646} 647 648/* get charge current in mA (platform data must provide resistor sense) */ 649static int bq2415x_get_charge_current(struct bq2415x_device *bq) 650{ 651 int ret; 652 653 if (bq->init_data.resistor_sense <= 0) 654 return -EINVAL; 655 656 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT, 657 BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG); 658 if (ret < 0) 659 return ret; 660 return (37400 + 6800*ret) / bq->init_data.resistor_sense; 661} 662 663/* set termination current in mA (platform data must provide resistor sense) */ 664static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA) 665{ 666 int val; 667 668 if (bq->init_data.resistor_sense <= 0) 669 return -EINVAL; 670 671 val = (mA * bq->init_data.resistor_sense - 3400) / 3400; 672 if (val < 0) 673 val = 0; 674 else if (val > 7) 675 val = 7; 676 677 return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val, 678 BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET, 679 BQ2415X_SHIFT_VI_TERM); 680} 681 682/* get termination current in mA (platform data must provide resistor sense) */ 683static int bq2415x_get_termination_current(struct bq2415x_device *bq) 684{ 685 int ret; 686 687 if (bq->init_data.resistor_sense <= 0) 688 return -EINVAL; 689 690 ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT, 691 BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM); 692 if (ret < 0) 693 return ret; 694 return (3400 + 3400*ret) / bq->init_data.resistor_sense; 695} 696 697/* set default value of property */ 698#define bq2415x_set_default_value(bq, prop) \ 699 do { \ 700 int ret = 0; \ 701 if (bq->init_data.prop != -1) \ 702 ret = bq2415x_set_##prop(bq, bq->init_data.prop); \ 703 if (ret < 0) \ 704 return ret; \ 705 } while (0) 706 707/* set default values of all properties */ 708static int bq2415x_set_defaults(struct bq2415x_device *bq) 709{ 710 bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE); 711 bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE); 712 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE); 713 714 bq2415x_set_default_value(bq, current_limit); 715 bq2415x_set_default_value(bq, weak_battery_voltage); 716 bq2415x_set_default_value(bq, battery_regulation_voltage); 717 718 if (bq->init_data.resistor_sense > 0) { 719 bq2415x_set_default_value(bq, charge_current); 720 bq2415x_set_default_value(bq, termination_current); 721 bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE); 722 } 723 724 bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE); 725 return 0; 726} 727 728/**** charger mode functions ****/ 729 730/* set charger mode */ 731static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode) 732{ 733 int ret = 0; 734 int charger = 0; 735 int boost = 0; 736 737 if (mode == BQ2415X_MODE_BOOST) 738 boost = 1; 739 else if (mode != BQ2415X_MODE_OFF) 740 charger = 1; 741 742 if (!charger) 743 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE); 744 745 if (!boost) 746 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE); 747 748 if (ret < 0) 749 return ret; 750 751 switch (mode) { 752 case BQ2415X_MODE_OFF: 753 dev_dbg(bq->dev, "changing mode to: Offline\n"); 754 ret = bq2415x_set_current_limit(bq, 100); 755 break; 756 case BQ2415X_MODE_NONE: 757 dev_dbg(bq->dev, "changing mode to: N/A\n"); 758 ret = bq2415x_set_current_limit(bq, 100); 759 break; 760 case BQ2415X_MODE_HOST_CHARGER: 761 dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n"); 762 ret = bq2415x_set_current_limit(bq, 500); 763 break; 764 case BQ2415X_MODE_DEDICATED_CHARGER: 765 dev_dbg(bq->dev, "changing mode to: Dedicated charger\n"); 766 ret = bq2415x_set_current_limit(bq, 1800); 767 break; 768 case BQ2415X_MODE_BOOST: /* Boost mode */ 769 dev_dbg(bq->dev, "changing mode to: Boost\n"); 770 ret = bq2415x_set_current_limit(bq, 100); 771 break; 772 } 773 774 if (ret < 0) 775 return ret; 776 777 if (charger) 778 ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE); 779 else if (boost) 780 ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE); 781 782 if (ret < 0) 783 return ret; 784 785 bq2415x_set_default_value(bq, weak_battery_voltage); 786 bq2415x_set_default_value(bq, battery_regulation_voltage); 787 788 bq->mode = mode; 789 sysfs_notify(&bq->charger->dev.kobj, NULL, "mode"); 790 791 return 0; 792 793} 794 795static bool bq2415x_update_reported_mode(struct bq2415x_device *bq, int mA) 796{ 797 enum bq2415x_mode mode; 798 799 if (mA == 0) 800 mode = BQ2415X_MODE_OFF; 801 else if (mA < 500) 802 mode = BQ2415X_MODE_NONE; 803 else if (mA < 1800) 804 mode = BQ2415X_MODE_HOST_CHARGER; 805 else 806 mode = BQ2415X_MODE_DEDICATED_CHARGER; 807 808 if (bq->reported_mode == mode) 809 return false; 810 811 bq->reported_mode = mode; 812 return true; 813} 814 815static int bq2415x_notifier_call(struct notifier_block *nb, 816 unsigned long val, void *v) 817{ 818 struct bq2415x_device *bq = 819 container_of(nb, struct bq2415x_device, nb); 820 struct power_supply *psy = v; 821 union power_supply_propval prop; 822 int ret; 823 824 if (val != PSY_EVENT_PROP_CHANGED) 825 return NOTIFY_OK; 826 827 /* Ignore event if it was not send by notify_node/notify_device */ 828 if (bq->notify_node) { 829 if (!psy->dev.parent || 830 psy->dev.parent->of_node != bq->notify_node) 831 return NOTIFY_OK; 832 } else if (bq->init_data.notify_device) { 833 if (strcmp(psy->desc->name, bq->init_data.notify_device) != 0) 834 return NOTIFY_OK; 835 } 836 837 dev_dbg(bq->dev, "notifier call was called\n"); 838 839 ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX, 840 &prop); 841 if (ret != 0) 842 return NOTIFY_OK; 843 844 if (!bq2415x_update_reported_mode(bq, prop.intval)) 845 return NOTIFY_OK; 846 847 /* if automode is not enabled do not tell about reported_mode */ 848 if (bq->automode < 1) 849 return NOTIFY_OK; 850 851 schedule_delayed_work(&bq->work, 0); 852 853 return NOTIFY_OK; 854} 855 856/**** timer functions ****/ 857 858/* enable/disable auto resetting chip timer */ 859static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state) 860{ 861 mutex_lock(&bq2415x_timer_mutex); 862 863 if (bq->autotimer == state) { 864 mutex_unlock(&bq2415x_timer_mutex); 865 return; 866 } 867 868 bq->autotimer = state; 869 870 if (state) { 871 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ); 872 bq2415x_exec_command(bq, BQ2415X_TIMER_RESET); 873 bq->timer_error = NULL; 874 } else { 875 cancel_delayed_work_sync(&bq->work); 876 } 877 878 mutex_unlock(&bq2415x_timer_mutex); 879} 880 881/* called by bq2415x_timer_work on timer error */ 882static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg) 883{ 884 bq->timer_error = msg; 885 sysfs_notify(&bq->charger->dev.kobj, NULL, "timer"); 886 dev_err(bq->dev, "%s\n", msg); 887 if (bq->automode > 0) 888 bq->automode = 0; 889 bq2415x_set_mode(bq, BQ2415X_MODE_OFF); 890 bq2415x_set_autotimer(bq, 0); 891} 892 893/* delayed work function for auto resetting chip timer */ 894static void bq2415x_timer_work(struct work_struct *work) 895{ 896 struct bq2415x_device *bq = container_of(work, struct bq2415x_device, 897 work.work); 898 int ret; 899 int error; 900 int boost; 901 902 if (bq->automode > 0 && (bq->reported_mode != bq->mode)) { 903 sysfs_notify(&bq->charger->dev.kobj, NULL, "reported_mode"); 904 bq2415x_set_mode(bq, bq->reported_mode); 905 } 906 907 if (!bq->autotimer) 908 return; 909 910 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET); 911 if (ret < 0) { 912 bq2415x_timer_error(bq, "Resetting timer failed"); 913 return; 914 } 915 916 boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS); 917 if (boost < 0) { 918 bq2415x_timer_error(bq, "Unknown error"); 919 return; 920 } 921 922 error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS); 923 if (error < 0) { 924 bq2415x_timer_error(bq, "Unknown error"); 925 return; 926 } 927 928 if (boost) { 929 switch (error) { 930 /* Non fatal errors, chip is OK */ 931 case 0: /* No error */ 932 break; 933 case 6: /* Timer expired */ 934 dev_err(bq->dev, "Timer expired\n"); 935 break; 936 case 3: /* Battery voltage too low */ 937 dev_err(bq->dev, "Battery voltage to low\n"); 938 break; 939 940 /* Fatal errors, disable and reset chip */ 941 case 1: /* Overvoltage protection (chip fried) */ 942 bq2415x_timer_error(bq, 943 "Overvoltage protection (chip fried)"); 944 return; 945 case 2: /* Overload */ 946 bq2415x_timer_error(bq, "Overload"); 947 return; 948 case 4: /* Battery overvoltage protection */ 949 bq2415x_timer_error(bq, 950 "Battery overvoltage protection"); 951 return; 952 case 5: /* Thermal shutdown (too hot) */ 953 bq2415x_timer_error(bq, 954 "Thermal shutdown (too hot)"); 955 return; 956 case 7: /* N/A */ 957 bq2415x_timer_error(bq, "Unknown error"); 958 return; 959 } 960 } else { 961 switch (error) { 962 /* Non fatal errors, chip is OK */ 963 case 0: /* No error */ 964 break; 965 case 2: /* Sleep mode */ 966 dev_err(bq->dev, "Sleep mode\n"); 967 break; 968 case 3: /* Poor input source */ 969 dev_err(bq->dev, "Poor input source\n"); 970 break; 971 case 6: /* Timer expired */ 972 dev_err(bq->dev, "Timer expired\n"); 973 break; 974 case 7: /* No battery */ 975 dev_err(bq->dev, "No battery\n"); 976 break; 977 978 /* Fatal errors, disable and reset chip */ 979 case 1: /* Overvoltage protection (chip fried) */ 980 bq2415x_timer_error(bq, 981 "Overvoltage protection (chip fried)"); 982 return; 983 case 4: /* Battery overvoltage protection */ 984 bq2415x_timer_error(bq, 985 "Battery overvoltage protection"); 986 return; 987 case 5: /* Thermal shutdown (too hot) */ 988 bq2415x_timer_error(bq, 989 "Thermal shutdown (too hot)"); 990 return; 991 } 992 } 993 994 schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ); 995} 996 997/**** power supply interface code ****/ 998 999static enum power_supply_property bq2415x_power_supply_props[] = { 1000 /* TODO: maybe add more power supply properties */ 1001 POWER_SUPPLY_PROP_STATUS, 1002 POWER_SUPPLY_PROP_MODEL_NAME, 1003}; 1004 1005static int bq2415x_power_supply_get_property(struct power_supply *psy, 1006 enum power_supply_property psp, 1007 union power_supply_propval *val) 1008{ 1009 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1010 int ret; 1011 1012 switch (psp) { 1013 case POWER_SUPPLY_PROP_STATUS: 1014 ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS); 1015 if (ret < 0) 1016 return ret; 1017 else if (ret == 0) /* Ready */ 1018 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 1019 else if (ret == 1) /* Charge in progress */ 1020 val->intval = POWER_SUPPLY_STATUS_CHARGING; 1021 else if (ret == 2) /* Charge done */ 1022 val->intval = POWER_SUPPLY_STATUS_FULL; 1023 else 1024 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 1025 break; 1026 case POWER_SUPPLY_PROP_MODEL_NAME: 1027 val->strval = bq->model; 1028 break; 1029 default: 1030 return -EINVAL; 1031 } 1032 return 0; 1033} 1034 1035static int bq2415x_power_supply_init(struct bq2415x_device *bq) 1036{ 1037 int ret; 1038 int chip; 1039 char revstr[8]; 1040 struct power_supply_config psy_cfg = { .drv_data = bq, }; 1041 1042 bq->charger_desc.name = bq->name; 1043 bq->charger_desc.type = POWER_SUPPLY_TYPE_USB; 1044 bq->charger_desc.properties = bq2415x_power_supply_props; 1045 bq->charger_desc.num_properties = 1046 ARRAY_SIZE(bq2415x_power_supply_props); 1047 bq->charger_desc.get_property = bq2415x_power_supply_get_property; 1048 1049 ret = bq2415x_detect_chip(bq); 1050 if (ret < 0) 1051 chip = BQUNKNOWN; 1052 else 1053 chip = ret; 1054 1055 ret = bq2415x_detect_revision(bq); 1056 if (ret < 0) 1057 strcpy(revstr, "unknown"); 1058 else 1059 sprintf(revstr, "1.%d", ret); 1060 1061 bq->model = kasprintf(GFP_KERNEL, 1062 "chip %s, revision %s, vender code %.3d", 1063 bq2415x_chip_name[chip], revstr, 1064 bq2415x_get_vender_code(bq)); 1065 if (!bq->model) { 1066 dev_err(bq->dev, "failed to allocate model name\n"); 1067 return -ENOMEM; 1068 } 1069 1070 bq->charger = power_supply_register(bq->dev, &bq->charger_desc, 1071 &psy_cfg); 1072 if (IS_ERR(bq->charger)) { 1073 kfree(bq->model); 1074 return PTR_ERR(bq->charger); 1075 } 1076 1077 return 0; 1078} 1079 1080static void bq2415x_power_supply_exit(struct bq2415x_device *bq) 1081{ 1082 bq->autotimer = 0; 1083 if (bq->automode > 0) 1084 bq->automode = 0; 1085 cancel_delayed_work_sync(&bq->work); 1086 power_supply_unregister(bq->charger); 1087 kfree(bq->model); 1088} 1089 1090/**** additional sysfs entries for power supply interface ****/ 1091 1092/* show *_status entries */ 1093static ssize_t bq2415x_sysfs_show_status(struct device *dev, 1094 struct device_attribute *attr, 1095 char *buf) 1096{ 1097 struct power_supply *psy = dev_get_drvdata(dev); 1098 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1099 enum bq2415x_command command; 1100 int ret; 1101 1102 if (strcmp(attr->attr.name, "otg_status") == 0) 1103 command = BQ2415X_OTG_STATUS; 1104 else if (strcmp(attr->attr.name, "charge_status") == 0) 1105 command = BQ2415X_CHARGE_STATUS; 1106 else if (strcmp(attr->attr.name, "boost_status") == 0) 1107 command = BQ2415X_BOOST_STATUS; 1108 else if (strcmp(attr->attr.name, "fault_status") == 0) 1109 command = BQ2415X_FAULT_STATUS; 1110 else 1111 return -EINVAL; 1112 1113 ret = bq2415x_exec_command(bq, command); 1114 if (ret < 0) 1115 return ret; 1116 return sprintf(buf, "%d\n", ret); 1117} 1118 1119/* 1120 * set timer entry: 1121 * auto - enable auto mode 1122 * off - disable auto mode 1123 * (other values) - reset chip timer 1124 */ 1125static ssize_t bq2415x_sysfs_set_timer(struct device *dev, 1126 struct device_attribute *attr, 1127 const char *buf, 1128 size_t count) 1129{ 1130 struct power_supply *psy = dev_get_drvdata(dev); 1131 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1132 int ret = 0; 1133 1134 if (strncmp(buf, "auto", 4) == 0) 1135 bq2415x_set_autotimer(bq, 1); 1136 else if (strncmp(buf, "off", 3) == 0) 1137 bq2415x_set_autotimer(bq, 0); 1138 else 1139 ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET); 1140 1141 if (ret < 0) 1142 return ret; 1143 return count; 1144} 1145 1146/* show timer entry (auto or off) */ 1147static ssize_t bq2415x_sysfs_show_timer(struct device *dev, 1148 struct device_attribute *attr, 1149 char *buf) 1150{ 1151 struct power_supply *psy = dev_get_drvdata(dev); 1152 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1153 1154 if (bq->timer_error) 1155 return sprintf(buf, "%s\n", bq->timer_error); 1156 1157 if (bq->autotimer) 1158 return sprintf(buf, "auto\n"); 1159 return sprintf(buf, "off\n"); 1160} 1161 1162/* 1163 * set mode entry: 1164 * auto - if automode is supported, enable it and set mode to reported 1165 * none - disable charger and boost mode 1166 * host - charging mode for host/hub chargers (current limit 500mA) 1167 * dedicated - charging mode for dedicated chargers (unlimited current limit) 1168 * boost - disable charger and enable boost mode 1169 */ 1170static ssize_t bq2415x_sysfs_set_mode(struct device *dev, 1171 struct device_attribute *attr, 1172 const char *buf, 1173 size_t count) 1174{ 1175 struct power_supply *psy = dev_get_drvdata(dev); 1176 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1177 enum bq2415x_mode mode; 1178 int ret = 0; 1179 1180 if (strncmp(buf, "auto", 4) == 0) { 1181 if (bq->automode < 0) 1182 return -EINVAL; 1183 bq->automode = 1; 1184 mode = bq->reported_mode; 1185 } else if (strncmp(buf, "off", 3) == 0) { 1186 if (bq->automode > 0) 1187 bq->automode = 0; 1188 mode = BQ2415X_MODE_OFF; 1189 } else if (strncmp(buf, "none", 4) == 0) { 1190 if (bq->automode > 0) 1191 bq->automode = 0; 1192 mode = BQ2415X_MODE_NONE; 1193 } else if (strncmp(buf, "host", 4) == 0) { 1194 if (bq->automode > 0) 1195 bq->automode = 0; 1196 mode = BQ2415X_MODE_HOST_CHARGER; 1197 } else if (strncmp(buf, "dedicated", 9) == 0) { 1198 if (bq->automode > 0) 1199 bq->automode = 0; 1200 mode = BQ2415X_MODE_DEDICATED_CHARGER; 1201 } else if (strncmp(buf, "boost", 5) == 0) { 1202 if (bq->automode > 0) 1203 bq->automode = 0; 1204 mode = BQ2415X_MODE_BOOST; 1205 } else if (strncmp(buf, "reset", 5) == 0) { 1206 bq2415x_reset_chip(bq); 1207 bq2415x_set_defaults(bq); 1208 if (bq->automode <= 0) 1209 return count; 1210 bq->automode = 1; 1211 mode = bq->reported_mode; 1212 } else { 1213 return -EINVAL; 1214 } 1215 1216 ret = bq2415x_set_mode(bq, mode); 1217 if (ret < 0) 1218 return ret; 1219 return count; 1220} 1221 1222/* show mode entry (auto, none, host, dedicated or boost) */ 1223static ssize_t bq2415x_sysfs_show_mode(struct device *dev, 1224 struct device_attribute *attr, 1225 char *buf) 1226{ 1227 struct power_supply *psy = dev_get_drvdata(dev); 1228 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1229 ssize_t ret = 0; 1230 1231 if (bq->automode > 0) 1232 ret += sprintf(buf+ret, "auto ("); 1233 1234 switch (bq->mode) { 1235 case BQ2415X_MODE_OFF: 1236 ret += sprintf(buf+ret, "off"); 1237 break; 1238 case BQ2415X_MODE_NONE: 1239 ret += sprintf(buf+ret, "none"); 1240 break; 1241 case BQ2415X_MODE_HOST_CHARGER: 1242 ret += sprintf(buf+ret, "host"); 1243 break; 1244 case BQ2415X_MODE_DEDICATED_CHARGER: 1245 ret += sprintf(buf+ret, "dedicated"); 1246 break; 1247 case BQ2415X_MODE_BOOST: 1248 ret += sprintf(buf+ret, "boost"); 1249 break; 1250 } 1251 1252 if (bq->automode > 0) 1253 ret += sprintf(buf+ret, ")"); 1254 1255 ret += sprintf(buf+ret, "\n"); 1256 return ret; 1257} 1258 1259/* show reported_mode entry (none, host, dedicated or boost) */ 1260static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev, 1261 struct device_attribute *attr, 1262 char *buf) 1263{ 1264 struct power_supply *psy = dev_get_drvdata(dev); 1265 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1266 1267 if (bq->automode < 0) 1268 return -EINVAL; 1269 1270 switch (bq->reported_mode) { 1271 case BQ2415X_MODE_OFF: 1272 return sprintf(buf, "off\n"); 1273 case BQ2415X_MODE_NONE: 1274 return sprintf(buf, "none\n"); 1275 case BQ2415X_MODE_HOST_CHARGER: 1276 return sprintf(buf, "host\n"); 1277 case BQ2415X_MODE_DEDICATED_CHARGER: 1278 return sprintf(buf, "dedicated\n"); 1279 case BQ2415X_MODE_BOOST: 1280 return sprintf(buf, "boost\n"); 1281 } 1282 1283 return -EINVAL; 1284} 1285 1286/* directly set raw value to chip register, format: 'register value' */ 1287static ssize_t bq2415x_sysfs_set_registers(struct device *dev, 1288 struct device_attribute *attr, 1289 const char *buf, 1290 size_t count) 1291{ 1292 struct power_supply *psy = dev_get_drvdata(dev); 1293 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1294 ssize_t ret = 0; 1295 unsigned int reg; 1296 unsigned int val; 1297 1298 if (sscanf(buf, "%x %x", ®, &val) != 2) 1299 return -EINVAL; 1300 1301 if (reg > 4 || val > 255) 1302 return -EINVAL; 1303 1304 ret = bq2415x_i2c_write(bq, reg, val); 1305 if (ret < 0) 1306 return ret; 1307 return count; 1308} 1309 1310/* print value of chip register, format: 'register=value' */ 1311static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq, 1312 u8 reg, 1313 char *buf) 1314{ 1315 int ret = bq2415x_i2c_read(bq, reg); 1316 1317 if (ret < 0) 1318 return sprintf(buf, "%#.2x=error %d\n", reg, ret); 1319 return sprintf(buf, "%#.2x=%#.2x\n", reg, ret); 1320} 1321 1322/* show all raw values of chip register, format per line: 'register=value' */ 1323static ssize_t bq2415x_sysfs_show_registers(struct device *dev, 1324 struct device_attribute *attr, 1325 char *buf) 1326{ 1327 struct power_supply *psy = dev_get_drvdata(dev); 1328 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1329 ssize_t ret = 0; 1330 1331 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret); 1332 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret); 1333 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret); 1334 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret); 1335 ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret); 1336 return ret; 1337} 1338 1339/* set current and voltage limit entries (in mA or mV) */ 1340static ssize_t bq2415x_sysfs_set_limit(struct device *dev, 1341 struct device_attribute *attr, 1342 const char *buf, 1343 size_t count) 1344{ 1345 struct power_supply *psy = dev_get_drvdata(dev); 1346 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1347 long val; 1348 int ret; 1349 1350 if (kstrtol(buf, 10, &val) < 0) 1351 return -EINVAL; 1352 1353 if (strcmp(attr->attr.name, "current_limit") == 0) 1354 ret = bq2415x_set_current_limit(bq, val); 1355 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0) 1356 ret = bq2415x_set_weak_battery_voltage(bq, val); 1357 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0) 1358 ret = bq2415x_set_battery_regulation_voltage(bq, val); 1359 else if (strcmp(attr->attr.name, "charge_current") == 0) 1360 ret = bq2415x_set_charge_current(bq, val); 1361 else if (strcmp(attr->attr.name, "termination_current") == 0) 1362 ret = bq2415x_set_termination_current(bq, val); 1363 else 1364 return -EINVAL; 1365 1366 if (ret < 0) 1367 return ret; 1368 return count; 1369} 1370 1371/* show current and voltage limit entries (in mA or mV) */ 1372static ssize_t bq2415x_sysfs_show_limit(struct device *dev, 1373 struct device_attribute *attr, 1374 char *buf) 1375{ 1376 struct power_supply *psy = dev_get_drvdata(dev); 1377 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1378 int ret; 1379 1380 if (strcmp(attr->attr.name, "current_limit") == 0) 1381 ret = bq2415x_get_current_limit(bq); 1382 else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0) 1383 ret = bq2415x_get_weak_battery_voltage(bq); 1384 else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0) 1385 ret = bq2415x_get_battery_regulation_voltage(bq); 1386 else if (strcmp(attr->attr.name, "charge_current") == 0) 1387 ret = bq2415x_get_charge_current(bq); 1388 else if (strcmp(attr->attr.name, "termination_current") == 0) 1389 ret = bq2415x_get_termination_current(bq); 1390 else 1391 return -EINVAL; 1392 1393 if (ret < 0) 1394 return ret; 1395 return sprintf(buf, "%d\n", ret); 1396} 1397 1398/* set *_enable entries */ 1399static ssize_t bq2415x_sysfs_set_enable(struct device *dev, 1400 struct device_attribute *attr, 1401 const char *buf, 1402 size_t count) 1403{ 1404 struct power_supply *psy = dev_get_drvdata(dev); 1405 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1406 enum bq2415x_command command; 1407 long val; 1408 int ret; 1409 1410 if (kstrtol(buf, 10, &val) < 0) 1411 return -EINVAL; 1412 1413 if (strcmp(attr->attr.name, "charge_termination_enable") == 0) 1414 command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE : 1415 BQ2415X_CHARGE_TERMINATION_DISABLE; 1416 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0) 1417 command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE : 1418 BQ2415X_HIGH_IMPEDANCE_DISABLE; 1419 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0) 1420 command = val ? BQ2415X_OTG_PIN_ENABLE : 1421 BQ2415X_OTG_PIN_DISABLE; 1422 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0) 1423 command = val ? BQ2415X_STAT_PIN_ENABLE : 1424 BQ2415X_STAT_PIN_DISABLE; 1425 else 1426 return -EINVAL; 1427 1428 ret = bq2415x_exec_command(bq, command); 1429 if (ret < 0) 1430 return ret; 1431 return count; 1432} 1433 1434/* show *_enable entries */ 1435static ssize_t bq2415x_sysfs_show_enable(struct device *dev, 1436 struct device_attribute *attr, 1437 char *buf) 1438{ 1439 struct power_supply *psy = dev_get_drvdata(dev); 1440 struct bq2415x_device *bq = power_supply_get_drvdata(psy); 1441 enum bq2415x_command command; 1442 int ret; 1443 1444 if (strcmp(attr->attr.name, "charge_termination_enable") == 0) 1445 command = BQ2415X_CHARGE_TERMINATION_STATUS; 1446 else if (strcmp(attr->attr.name, "high_impedance_enable") == 0) 1447 command = BQ2415X_HIGH_IMPEDANCE_STATUS; 1448 else if (strcmp(attr->attr.name, "otg_pin_enable") == 0) 1449 command = BQ2415X_OTG_PIN_STATUS; 1450 else if (strcmp(attr->attr.name, "stat_pin_enable") == 0) 1451 command = BQ2415X_STAT_PIN_STATUS; 1452 else 1453 return -EINVAL; 1454 1455 ret = bq2415x_exec_command(bq, command); 1456 if (ret < 0) 1457 return ret; 1458 return sprintf(buf, "%d\n", ret); 1459} 1460 1461static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO, 1462 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1463static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO, 1464 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1465static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO, 1466 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1467static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO, 1468 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1469static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO, 1470 bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit); 1471 1472static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO, 1473 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1474static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO, 1475 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1476static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO, 1477 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1478static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO, 1479 bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable); 1480 1481static DEVICE_ATTR(reported_mode, S_IRUGO, 1482 bq2415x_sysfs_show_reported_mode, NULL); 1483static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO, 1484 bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode); 1485static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO, 1486 bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer); 1487 1488static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO, 1489 bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers); 1490 1491static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1492static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1493static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1494static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL); 1495 1496static struct attribute *bq2415x_sysfs_attributes[] = { 1497 /* 1498 * TODO: some (appropriate) of these attrs should be switched to 1499 * use power supply class props. 1500 */ 1501 &dev_attr_current_limit.attr, 1502 &dev_attr_weak_battery_voltage.attr, 1503 &dev_attr_battery_regulation_voltage.attr, 1504 &dev_attr_charge_current.attr, 1505 &dev_attr_termination_current.attr, 1506 1507 &dev_attr_charge_termination_enable.attr, 1508 &dev_attr_high_impedance_enable.attr, 1509 &dev_attr_otg_pin_enable.attr, 1510 &dev_attr_stat_pin_enable.attr, 1511 1512 &dev_attr_reported_mode.attr, 1513 &dev_attr_mode.attr, 1514 &dev_attr_timer.attr, 1515 1516 &dev_attr_registers.attr, 1517 1518 &dev_attr_otg_status.attr, 1519 &dev_attr_charge_status.attr, 1520 &dev_attr_boost_status.attr, 1521 &dev_attr_fault_status.attr, 1522 NULL, 1523}; 1524 1525static const struct attribute_group bq2415x_sysfs_attr_group = { 1526 .attrs = bq2415x_sysfs_attributes, 1527}; 1528 1529static int bq2415x_sysfs_init(struct bq2415x_device *bq) 1530{ 1531 return sysfs_create_group(&bq->charger->dev.kobj, 1532 &bq2415x_sysfs_attr_group); 1533} 1534 1535static void bq2415x_sysfs_exit(struct bq2415x_device *bq) 1536{ 1537 sysfs_remove_group(&bq->charger->dev.kobj, &bq2415x_sysfs_attr_group); 1538} 1539 1540/* main bq2415x probe function */ 1541static int bq2415x_probe(struct i2c_client *client, 1542 const struct i2c_device_id *id) 1543{ 1544 int ret; 1545 int num; 1546 char *name = NULL; 1547 struct bq2415x_device *bq; 1548 struct device_node *np = client->dev.of_node; 1549 struct bq2415x_platform_data *pdata = client->dev.platform_data; 1550 const struct acpi_device_id *acpi_id = NULL; 1551 struct power_supply *notify_psy = NULL; 1552 union power_supply_propval prop; 1553 1554 if (!np && !pdata && !ACPI_HANDLE(&client->dev)) { 1555 dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n"); 1556 return -ENODEV; 1557 } 1558 1559 /* Get new ID for the new device */ 1560 mutex_lock(&bq2415x_id_mutex); 1561 num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL); 1562 mutex_unlock(&bq2415x_id_mutex); 1563 if (num < 0) 1564 return num; 1565 1566 if (id) { 1567 name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num); 1568 } else if (ACPI_HANDLE(&client->dev)) { 1569 acpi_id = 1570 acpi_match_device(client->dev.driver->acpi_match_table, 1571 &client->dev); 1572 name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num); 1573 } 1574 if (!name) { 1575 dev_err(&client->dev, "failed to allocate device name\n"); 1576 ret = -ENOMEM; 1577 goto error_1; 1578 } 1579 1580 bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL); 1581 if (!bq) { 1582 ret = -ENOMEM; 1583 goto error_2; 1584 } 1585 1586 i2c_set_clientdata(client, bq); 1587 1588 bq->id = num; 1589 bq->dev = &client->dev; 1590 if (id) 1591 bq->chip = id->driver_data; 1592 else if (ACPI_HANDLE(bq->dev)) 1593 bq->chip = acpi_id->driver_data; 1594 bq->name = name; 1595 bq->mode = BQ2415X_MODE_OFF; 1596 bq->reported_mode = BQ2415X_MODE_OFF; 1597 bq->autotimer = 0; 1598 bq->automode = 0; 1599 1600 if (np || ACPI_HANDLE(bq->dev)) { 1601 ret = device_property_read_u32(bq->dev, 1602 "ti,current-limit", 1603 &bq->init_data.current_limit); 1604 if (ret) 1605 goto error_2; 1606 ret = device_property_read_u32(bq->dev, 1607 "ti,weak-battery-voltage", 1608 &bq->init_data.weak_battery_voltage); 1609 if (ret) 1610 goto error_2; 1611 ret = device_property_read_u32(bq->dev, 1612 "ti,battery-regulation-voltage", 1613 &bq->init_data.battery_regulation_voltage); 1614 if (ret) 1615 goto error_2; 1616 ret = device_property_read_u32(bq->dev, 1617 "ti,charge-current", 1618 &bq->init_data.charge_current); 1619 if (ret) 1620 goto error_2; 1621 ret = device_property_read_u32(bq->dev, 1622 "ti,termination-current", 1623 &bq->init_data.termination_current); 1624 if (ret) 1625 goto error_2; 1626 ret = device_property_read_u32(bq->dev, 1627 "ti,resistor-sense", 1628 &bq->init_data.resistor_sense); 1629 if (ret) 1630 goto error_2; 1631 if (np) 1632 bq->notify_node = of_parse_phandle(np, 1633 "ti,usb-charger-detection", 0); 1634 } else { 1635 memcpy(&bq->init_data, pdata, sizeof(bq->init_data)); 1636 } 1637 1638 bq2415x_reset_chip(bq); 1639 1640 ret = bq2415x_power_supply_init(bq); 1641 if (ret) { 1642 dev_err(bq->dev, "failed to register power supply: %d\n", ret); 1643 goto error_2; 1644 } 1645 1646 ret = bq2415x_sysfs_init(bq); 1647 if (ret) { 1648 dev_err(bq->dev, "failed to create sysfs entries: %d\n", ret); 1649 goto error_3; 1650 } 1651 1652 ret = bq2415x_set_defaults(bq); 1653 if (ret) { 1654 dev_err(bq->dev, "failed to set default values: %d\n", ret); 1655 goto error_4; 1656 } 1657 1658 if (bq->notify_node || bq->init_data.notify_device) { 1659 bq->nb.notifier_call = bq2415x_notifier_call; 1660 ret = power_supply_reg_notifier(&bq->nb); 1661 if (ret) { 1662 dev_err(bq->dev, "failed to reg notifier: %d\n", ret); 1663 goto error_4; 1664 } 1665 1666 bq->automode = 1; 1667 dev_info(bq->dev, "automode supported, waiting for events\n"); 1668 } else { 1669 bq->automode = -1; 1670 dev_info(bq->dev, "automode not supported\n"); 1671 } 1672 1673 /* Query for initial reported_mode and set it */ 1674 if (bq->nb.notifier_call) { 1675 if (np) { 1676 notify_psy = power_supply_get_by_phandle(np, 1677 "ti,usb-charger-detection"); 1678 if (IS_ERR(notify_psy)) 1679 notify_psy = NULL; 1680 } else if (bq->init_data.notify_device) { 1681 notify_psy = power_supply_get_by_name( 1682 bq->init_data.notify_device); 1683 } 1684 } 1685 if (notify_psy) { 1686 ret = power_supply_get_property(notify_psy, 1687 POWER_SUPPLY_PROP_CURRENT_MAX, &prop); 1688 power_supply_put(notify_psy); 1689 1690 if (ret == 0) { 1691 bq2415x_update_reported_mode(bq, prop.intval); 1692 bq2415x_set_mode(bq, bq->reported_mode); 1693 } 1694 } 1695 1696 INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work); 1697 bq2415x_set_autotimer(bq, 1); 1698 1699 dev_info(bq->dev, "driver registered\n"); 1700 return 0; 1701 1702error_4: 1703 bq2415x_sysfs_exit(bq); 1704error_3: 1705 bq2415x_power_supply_exit(bq); 1706error_2: 1707 if (bq && bq->notify_node) 1708 of_node_put(bq->notify_node); 1709 kfree(name); 1710error_1: 1711 mutex_lock(&bq2415x_id_mutex); 1712 idr_remove(&bq2415x_id, num); 1713 mutex_unlock(&bq2415x_id_mutex); 1714 1715 return ret; 1716} 1717 1718/* main bq2415x remove function */ 1719 1720static int bq2415x_remove(struct i2c_client *client) 1721{ 1722 struct bq2415x_device *bq = i2c_get_clientdata(client); 1723 1724 if (bq->nb.notifier_call) 1725 power_supply_unreg_notifier(&bq->nb); 1726 1727 if (bq->notify_node) 1728 of_node_put(bq->notify_node); 1729 1730 bq2415x_sysfs_exit(bq); 1731 bq2415x_power_supply_exit(bq); 1732 1733 bq2415x_reset_chip(bq); 1734 1735 mutex_lock(&bq2415x_id_mutex); 1736 idr_remove(&bq2415x_id, bq->id); 1737 mutex_unlock(&bq2415x_id_mutex); 1738 1739 dev_info(bq->dev, "driver unregistered\n"); 1740 1741 kfree(bq->name); 1742 1743 return 0; 1744} 1745 1746static const struct i2c_device_id bq2415x_i2c_id_table[] = { 1747 { "bq2415x", BQUNKNOWN }, 1748 { "bq24150", BQ24150 }, 1749 { "bq24150a", BQ24150A }, 1750 { "bq24151", BQ24151 }, 1751 { "bq24151a", BQ24151A }, 1752 { "bq24152", BQ24152 }, 1753 { "bq24153", BQ24153 }, 1754 { "bq24153a", BQ24153A }, 1755 { "bq24155", BQ24155 }, 1756 { "bq24156", BQ24156 }, 1757 { "bq24156a", BQ24156A }, 1758 { "bq24157s", BQ24157S }, 1759 { "bq24158", BQ24158 }, 1760 {}, 1761}; 1762MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table); 1763 1764static const struct acpi_device_id bq2415x_i2c_acpi_match[] = { 1765 { "BQ2415X", BQUNKNOWN }, 1766 { "BQ241500", BQ24150 }, 1767 { "BQA24150", BQ24150A }, 1768 { "BQ241510", BQ24151 }, 1769 { "BQA24151", BQ24151A }, 1770 { "BQ241520", BQ24152 }, 1771 { "BQ241530", BQ24153 }, 1772 { "BQA24153", BQ24153A }, 1773 { "BQ241550", BQ24155 }, 1774 { "BQ241560", BQ24156 }, 1775 { "BQA24156", BQ24156A }, 1776 { "BQS24157", BQ24157S }, 1777 { "BQ241580", BQ24158 }, 1778 {}, 1779}; 1780MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match); 1781 1782static struct i2c_driver bq2415x_driver = { 1783 .driver = { 1784 .name = "bq2415x-charger", 1785 .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match), 1786 }, 1787 .probe = bq2415x_probe, 1788 .remove = bq2415x_remove, 1789 .id_table = bq2415x_i2c_id_table, 1790}; 1791module_i2c_driver(bq2415x_driver); 1792 1793MODULE_AUTHOR("Pali Roh��r <pali.rohar@gmail.com>"); 1794MODULE_DESCRIPTION("bq2415x charger driver"); 1795MODULE_LICENSE("GPL"); 1796