1 /* 2 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver 3 * 4 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com> 5 * 6 * based on twl4030_bci_battery.c by TI 7 * Copyright (C) 2008 Texas Instruments, Inc. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 */ 14 15 #include <linux/init.h> 16 #include <linux/module.h> 17 #include <linux/slab.h> 18 #include <linux/err.h> 19 #include <linux/platform_device.h> 20 #include <linux/interrupt.h> 21 #include <linux/i2c/twl.h> 22 #include <linux/power_supply.h> 23 #include <linux/notifier.h> 24 #include <linux/usb/otg.h> 25 #include <linux/iio/consumer.h> 26 27 #define TWL4030_BCIMDEN 0x00 28 #define TWL4030_BCIMDKEY 0x01 29 #define TWL4030_BCIMSTATEC 0x02 30 #define TWL4030_BCIICHG 0x08 31 #define TWL4030_BCIVAC 0x0a 32 #define TWL4030_BCIVBUS 0x0c 33 #define TWL4030_BCIMFSTS3 0x0F 34 #define TWL4030_BCIMFSTS4 0x10 35 #define TWL4030_BCICTL1 0x23 36 #define TWL4030_BB_CFG 0x12 37 #define TWL4030_BCIIREF1 0x27 38 #define TWL4030_BCIIREF2 0x28 39 #define TWL4030_BCIMFKEY 0x11 40 #define TWL4030_BCIMFEN3 0x14 41 #define TWL4030_BCIMFTH8 0x1d 42 #define TWL4030_BCIMFTH9 0x1e 43 #define TWL4030_BCIWDKEY 0x21 44 45 #define TWL4030_BCIMFSTS1 0x01 46 47 #define TWL4030_BCIAUTOWEN BIT(5) 48 #define TWL4030_CONFIG_DONE BIT(4) 49 #define TWL4030_CVENAC BIT(2) 50 #define TWL4030_BCIAUTOUSB BIT(1) 51 #define TWL4030_BCIAUTOAC BIT(0) 52 #define TWL4030_CGAIN BIT(5) 53 #define TWL4030_USBFASTMCHG BIT(2) 54 #define TWL4030_STS_VBUS BIT(7) 55 #define TWL4030_STS_USB_ID BIT(2) 56 #define TWL4030_BBCHEN BIT(4) 57 #define TWL4030_BBSEL_MASK 0x0c 58 #define TWL4030_BBSEL_2V5 0x00 59 #define TWL4030_BBSEL_3V0 0x04 60 #define TWL4030_BBSEL_3V1 0x08 61 #define TWL4030_BBSEL_3V2 0x0c 62 #define TWL4030_BBISEL_MASK 0x03 63 #define TWL4030_BBISEL_25uA 0x00 64 #define TWL4030_BBISEL_150uA 0x01 65 #define TWL4030_BBISEL_500uA 0x02 66 #define TWL4030_BBISEL_1000uA 0x03 67 68 #define TWL4030_BATSTSPCHG BIT(2) 69 #define TWL4030_BATSTSMCHG BIT(6) 70 71 /* BCI interrupts */ 72 #define TWL4030_WOVF BIT(0) /* Watchdog overflow */ 73 #define TWL4030_TMOVF BIT(1) /* Timer overflow */ 74 #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */ 75 #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */ 76 #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */ 77 #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */ 78 #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */ 79 #define TWL4030_BATSTS BIT(7) /* Battery status */ 80 81 #define TWL4030_VBATLVL BIT(0) /* VBAT level */ 82 #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */ 83 #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */ 84 #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */ 85 86 #define TWL4030_MSTATEC_USB BIT(4) 87 #define TWL4030_MSTATEC_AC BIT(5) 88 #define TWL4030_MSTATEC_MASK 0x0f 89 #define TWL4030_MSTATEC_QUICK1 0x02 90 #define TWL4030_MSTATEC_QUICK7 0x07 91 #define TWL4030_MSTATEC_COMPLETE1 0x0b 92 #define TWL4030_MSTATEC_COMPLETE4 0x0e 93 94 /* 95 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11) 96 * then AC is available. 97 */ 98 static inline int ac_available(struct iio_channel *channel_vac) 99 { 100 int val, err; 101 102 if (!channel_vac) 103 return 0; 104 105 err = iio_read_channel_processed(channel_vac, &val); 106 if (err < 0) 107 return 0; 108 return val > 4500; 109 } 110 111 static bool allow_usb; 112 module_param(allow_usb, bool, 0644); 113 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current"); 114 115 struct twl4030_bci { 116 struct device *dev; 117 struct power_supply *ac; 118 struct power_supply *usb; 119 struct usb_phy *transceiver; 120 struct notifier_block usb_nb; 121 struct work_struct work; 122 int irq_chg; 123 int irq_bci; 124 int usb_enabled; 125 126 /* 127 * ichg_* and *_cur values in uA. If any are 'large', we set 128 * CGAIN to '1' which doubles the range for half the 129 * precision. 130 */ 131 unsigned int ichg_eoc, ichg_lo, ichg_hi; 132 unsigned int usb_cur, ac_cur; 133 struct iio_channel *channel_vac; 134 bool ac_is_active; 135 int usb_mode, ac_mode; /* charging mode requested */ 136 #define CHARGE_OFF 0 137 #define CHARGE_AUTO 1 138 #define CHARGE_LINEAR 2 139 140 /* When setting the USB current we slowly increase the 141 * requested current until target is reached or the voltage 142 * drops below 4.75V. In the latter case we step back one 143 * step. 144 */ 145 unsigned int usb_cur_target; 146 struct delayed_work current_worker; 147 #define USB_CUR_STEP 20000 /* 20mA at a time */ 148 #define USB_MIN_VOLT 4750000 /* 4.75V */ 149 #define USB_CUR_DELAY msecs_to_jiffies(100) 150 #define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */ 151 152 unsigned long event; 153 }; 154 155 /* strings for 'usb_mode' values */ 156 static char *modes[] = { "off", "auto", "continuous" }; 157 158 /* 159 * clear and set bits on an given register on a given module 160 */ 161 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg) 162 { 163 u8 val = 0; 164 int ret; 165 166 ret = twl_i2c_read_u8(mod_no, &val, reg); 167 if (ret) 168 return ret; 169 170 val &= ~clear; 171 val |= set; 172 173 return twl_i2c_write_u8(mod_no, val, reg); 174 } 175 176 static int twl4030_bci_read(u8 reg, u8 *val) 177 { 178 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg); 179 } 180 181 static int twl4030_clear_set_boot_bci(u8 clear, u8 set) 182 { 183 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear, 184 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set, 185 TWL4030_PM_MASTER_BOOT_BCI); 186 } 187 188 static int twl4030bci_read_adc_val(u8 reg) 189 { 190 int ret, temp; 191 u8 val; 192 193 /* read MSB */ 194 ret = twl4030_bci_read(reg + 1, &val); 195 if (ret) 196 return ret; 197 198 temp = (int)(val & 0x03) << 8; 199 200 /* read LSB */ 201 ret = twl4030_bci_read(reg, &val); 202 if (ret) 203 return ret; 204 205 return temp | val; 206 } 207 208 /* 209 * Check if Battery Pack was present 210 */ 211 static int twl4030_is_battery_present(struct twl4030_bci *bci) 212 { 213 int ret; 214 u8 val = 0; 215 216 /* Battery presence in Main charge? */ 217 ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3); 218 if (ret) 219 return ret; 220 if (val & TWL4030_BATSTSMCHG) 221 return 0; 222 223 /* 224 * OK, It could be that bootloader did not enable main charger, 225 * pre-charge is h/w auto. So, Battery presence in Pre-charge? 226 */ 227 ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val, 228 TWL4030_BCIMFSTS1); 229 if (ret) 230 return ret; 231 if (val & TWL4030_BATSTSPCHG) 232 return 0; 233 234 return -ENODEV; 235 } 236 237 /* 238 * TI provided formulas: 239 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 240 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7 241 * Here we use integer approximation of: 242 * CGAIN == 0: val * 1.6618 - 0.85 * 1000 243 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2 244 */ 245 /* 246 * convert twl register value for currents into uA 247 */ 248 static int regval2ua(int regval, bool cgain) 249 { 250 if (cgain) 251 return (regval * 16618 - 8500 * 1000) / 5; 252 else 253 return (regval * 16618 - 8500 * 1000) / 10; 254 } 255 256 /* 257 * convert uA currents into twl register value 258 */ 259 static int ua2regval(int ua, bool cgain) 260 { 261 int ret; 262 if (cgain) 263 ua /= 2; 264 ret = (ua * 10 + 8500 * 1000) / 16618; 265 /* rounding problems */ 266 if (ret < 512) 267 ret = 512; 268 return ret; 269 } 270 271 static int twl4030_charger_update_current(struct twl4030_bci *bci) 272 { 273 int status; 274 int cur; 275 unsigned reg, cur_reg; 276 u8 bcictl1, oldreg, fullreg; 277 bool cgain = false; 278 u8 boot_bci; 279 280 /* 281 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11) 282 * and AC is enabled, set current for 'ac' 283 */ 284 if (ac_available(bci->channel_vac)) { 285 cur = bci->ac_cur; 286 bci->ac_is_active = true; 287 } else { 288 cur = bci->usb_cur; 289 bci->ac_is_active = false; 290 if (cur > bci->usb_cur_target) { 291 cur = bci->usb_cur_target; 292 bci->usb_cur = cur; 293 } 294 if (cur < bci->usb_cur_target) 295 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); 296 } 297 298 /* First, check thresholds and see if cgain is needed */ 299 if (bci->ichg_eoc >= 200000) 300 cgain = true; 301 if (bci->ichg_lo >= 400000) 302 cgain = true; 303 if (bci->ichg_hi >= 820000) 304 cgain = true; 305 if (cur > 852000) 306 cgain = true; 307 308 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 309 if (status < 0) 310 return status; 311 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci, 312 TWL4030_PM_MASTER_BOOT_BCI) < 0) 313 boot_bci = 0; 314 boot_bci &= 7; 315 316 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) 317 /* Need to turn for charging while we change the 318 * CGAIN bit. Leave it off while everything is 319 * updated. 320 */ 321 twl4030_clear_set_boot_bci(boot_bci, 0); 322 323 /* 324 * For ichg_eoc, the hardware only supports reg values matching 325 * 100XXXX000, and requires the XXXX be stored in the high nibble 326 * of TWL4030_BCIMFTH8. 327 */ 328 reg = ua2regval(bci->ichg_eoc, cgain); 329 if (reg > 0x278) 330 reg = 0x278; 331 if (reg < 0x200) 332 reg = 0x200; 333 reg = (reg >> 3) & 0xf; 334 fullreg = reg << 4; 335 336 /* 337 * For ichg_lo, reg value must match 10XXXX0000. 338 * XXXX is stored in low nibble of TWL4030_BCIMFTH8. 339 */ 340 reg = ua2regval(bci->ichg_lo, cgain); 341 if (reg > 0x2F0) 342 reg = 0x2F0; 343 if (reg < 0x200) 344 reg = 0x200; 345 reg = (reg >> 4) & 0xf; 346 fullreg |= reg; 347 348 /* ichg_eoc and ichg_lo live in same register */ 349 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg); 350 if (status < 0) 351 return status; 352 if (oldreg != fullreg) { 353 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4, 354 TWL4030_BCIMFKEY); 355 if (status < 0) 356 return status; 357 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 358 fullreg, TWL4030_BCIMFTH8); 359 } 360 361 /* ichg_hi threshold must be 1XXXX01100 (I think) */ 362 reg = ua2regval(bci->ichg_hi, cgain); 363 if (reg > 0x3E0) 364 reg = 0x3E0; 365 if (reg < 0x200) 366 reg = 0x200; 367 fullreg = (reg >> 5) & 0xF; 368 fullreg <<= 4; 369 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg); 370 if (status < 0) 371 return status; 372 if ((oldreg & 0xF0) != fullreg) { 373 fullreg |= (oldreg & 0x0F); 374 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 375 TWL4030_BCIMFKEY); 376 if (status < 0) 377 return status; 378 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 379 fullreg, TWL4030_BCIMFTH9); 380 } 381 382 /* 383 * And finally, set the current. This is stored in 384 * two registers. 385 */ 386 reg = ua2regval(cur, cgain); 387 /* we have only 10 bits */ 388 if (reg > 0x3ff) 389 reg = 0x3ff; 390 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg); 391 if (status < 0) 392 return status; 393 cur_reg = oldreg; 394 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg); 395 if (status < 0) 396 return status; 397 cur_reg |= oldreg << 8; 398 if (reg != oldreg) { 399 /* disable write protection for one write access for 400 * BCIIREF */ 401 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 402 TWL4030_BCIMFKEY); 403 if (status < 0) 404 return status; 405 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 406 (reg & 0x100) ? 3 : 2, 407 TWL4030_BCIIREF2); 408 if (status < 0) 409 return status; 410 /* disable write protection for one write access for 411 * BCIIREF */ 412 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 413 TWL4030_BCIMFKEY); 414 if (status < 0) 415 return status; 416 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 417 reg & 0xff, 418 TWL4030_BCIIREF1); 419 } 420 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) { 421 /* Flip CGAIN and re-enable charging */ 422 bcictl1 ^= TWL4030_CGAIN; 423 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 424 bcictl1, TWL4030_BCICTL1); 425 twl4030_clear_set_boot_bci(0, boot_bci); 426 } 427 return 0; 428 } 429 430 static int twl4030_charger_get_current(void); 431 432 static void twl4030_current_worker(struct work_struct *data) 433 { 434 int v, curr; 435 int res; 436 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, 437 current_worker.work); 438 439 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 440 if (res < 0) 441 v = 0; 442 else 443 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 444 v = res * 6843; 445 curr = twl4030_charger_get_current(); 446 447 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr, 448 bci->usb_cur, bci->usb_cur_target); 449 450 if (v < USB_MIN_VOLT) { 451 /* Back up and stop adjusting. */ 452 bci->usb_cur -= USB_CUR_STEP; 453 bci->usb_cur_target = bci->usb_cur; 454 } else if (bci->usb_cur >= bci->usb_cur_target || 455 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) { 456 /* Reached target and voltage is OK - stop */ 457 return; 458 } else { 459 bci->usb_cur += USB_CUR_STEP; 460 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); 461 } 462 twl4030_charger_update_current(bci); 463 } 464 465 /* 466 * Enable/Disable USB Charge functionality. 467 */ 468 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) 469 { 470 int ret; 471 472 if (bci->usb_mode == CHARGE_OFF) 473 enable = false; 474 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) { 475 476 twl4030_charger_update_current(bci); 477 478 /* Need to keep phy powered */ 479 if (!bci->usb_enabled) { 480 pm_runtime_get_sync(bci->transceiver->dev); 481 bci->usb_enabled = 1; 482 } 483 484 if (bci->usb_mode == CHARGE_AUTO) 485 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ 486 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); 487 488 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ 489 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, 490 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); 491 if (bci->usb_mode == CHARGE_LINEAR) { 492 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0); 493 /* Watch dog key: WOVF acknowledge */ 494 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33, 495 TWL4030_BCIWDKEY); 496 /* 0x24 + EKEY6: off mode */ 497 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 498 TWL4030_BCIMDKEY); 499 /* EKEY2: Linear charge: USB path */ 500 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26, 501 TWL4030_BCIMDKEY); 502 /* WDKEY5: stop watchdog count */ 503 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3, 504 TWL4030_BCIWDKEY); 505 /* enable MFEN3 access */ 506 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c, 507 TWL4030_BCIMFKEY); 508 /* ICHGEOCEN - end-of-charge monitor (current < 80mA) 509 * (charging continues) 510 * ICHGLOWEN - current level monitor (charge continues) 511 * don't monitor over-current or heat save 512 */ 513 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0, 514 TWL4030_BCIMFEN3); 515 } 516 } else { 517 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); 518 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 519 TWL4030_BCIMDKEY); 520 if (bci->usb_enabled) { 521 pm_runtime_mark_last_busy(bci->transceiver->dev); 522 pm_runtime_put_autosuspend(bci->transceiver->dev); 523 bci->usb_enabled = 0; 524 } 525 bci->usb_cur = 0; 526 } 527 528 return ret; 529 } 530 531 /* 532 * Enable/Disable AC Charge funtionality. 533 */ 534 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable) 535 { 536 int ret; 537 538 if (bci->ac_mode == CHARGE_OFF) 539 enable = false; 540 541 if (enable) 542 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); 543 else 544 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); 545 546 return ret; 547 } 548 549 /* 550 * Enable/Disable charging of Backup Battery. 551 */ 552 static int twl4030_charger_enable_backup(int uvolt, int uamp) 553 { 554 int ret; 555 u8 flags; 556 557 if (uvolt < 2500000 || 558 uamp < 25) { 559 /* disable charging of backup battery */ 560 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 561 TWL4030_BBCHEN, 0, TWL4030_BB_CFG); 562 return ret; 563 } 564 565 flags = TWL4030_BBCHEN; 566 if (uvolt >= 3200000) 567 flags |= TWL4030_BBSEL_3V2; 568 else if (uvolt >= 3100000) 569 flags |= TWL4030_BBSEL_3V1; 570 else if (uvolt >= 3000000) 571 flags |= TWL4030_BBSEL_3V0; 572 else 573 flags |= TWL4030_BBSEL_2V5; 574 575 if (uamp >= 1000) 576 flags |= TWL4030_BBISEL_1000uA; 577 else if (uamp >= 500) 578 flags |= TWL4030_BBISEL_500uA; 579 else if (uamp >= 150) 580 flags |= TWL4030_BBISEL_150uA; 581 else 582 flags |= TWL4030_BBISEL_25uA; 583 584 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 585 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, 586 flags, 587 TWL4030_BB_CFG); 588 589 return ret; 590 } 591 592 /* 593 * TWL4030 CHG_PRES (AC charger presence) events 594 */ 595 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) 596 { 597 struct twl4030_bci *bci = arg; 598 599 dev_dbg(bci->dev, "CHG_PRES irq\n"); 600 /* reset current on each 'plug' event */ 601 bci->ac_cur = 500000; 602 twl4030_charger_update_current(bci); 603 power_supply_changed(bci->ac); 604 power_supply_changed(bci->usb); 605 606 return IRQ_HANDLED; 607 } 608 609 /* 610 * TWL4030 BCI monitoring events 611 */ 612 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) 613 { 614 struct twl4030_bci *bci = arg; 615 u8 irqs1, irqs2; 616 int ret; 617 618 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, 619 TWL4030_INTERRUPTS_BCIISR1A); 620 if (ret < 0) 621 return IRQ_HANDLED; 622 623 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, 624 TWL4030_INTERRUPTS_BCIISR2A); 625 if (ret < 0) 626 return IRQ_HANDLED; 627 628 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); 629 630 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { 631 /* charger state change, inform the core */ 632 power_supply_changed(bci->ac); 633 power_supply_changed(bci->usb); 634 } 635 twl4030_charger_update_current(bci); 636 637 /* various monitoring events, for now we just log them here */ 638 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) 639 dev_warn(bci->dev, "battery temperature out of range\n"); 640 641 if (irqs1 & TWL4030_BATSTS) 642 dev_crit(bci->dev, "battery disconnected\n"); 643 644 if (irqs2 & TWL4030_VBATOV) 645 dev_crit(bci->dev, "VBAT overvoltage\n"); 646 647 if (irqs2 & TWL4030_VBUSOV) 648 dev_crit(bci->dev, "VBUS overvoltage\n"); 649 650 if (irqs2 & TWL4030_ACCHGOV) 651 dev_crit(bci->dev, "Ac charger overvoltage\n"); 652 653 return IRQ_HANDLED; 654 } 655 656 /* 657 * Provide "max_current" attribute in sysfs. 658 */ 659 static ssize_t 660 twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr, 661 const char *buf, size_t n) 662 { 663 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 664 int cur = 0; 665 int status = 0; 666 status = kstrtoint(buf, 10, &cur); 667 if (status) 668 return status; 669 if (cur < 0) 670 return -EINVAL; 671 if (dev == &bci->ac->dev) 672 bci->ac_cur = cur; 673 else 674 bci->usb_cur_target = cur; 675 676 twl4030_charger_update_current(bci); 677 return n; 678 } 679 680 /* 681 * sysfs max_current show 682 */ 683 static ssize_t twl4030_bci_max_current_show(struct device *dev, 684 struct device_attribute *attr, char *buf) 685 { 686 int status = 0; 687 int cur = -1; 688 u8 bcictl1; 689 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 690 691 if (dev == &bci->ac->dev) { 692 if (!bci->ac_is_active) 693 cur = bci->ac_cur; 694 } else { 695 if (bci->ac_is_active) 696 cur = bci->usb_cur_target; 697 } 698 if (cur < 0) { 699 cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1); 700 if (cur < 0) 701 return cur; 702 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 703 if (status < 0) 704 return status; 705 cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN); 706 } 707 return scnprintf(buf, PAGE_SIZE, "%u\n", cur); 708 } 709 710 static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show, 711 twl4030_bci_max_current_store); 712 713 static void twl4030_bci_usb_work(struct work_struct *data) 714 { 715 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); 716 717 switch (bci->event) { 718 case USB_EVENT_VBUS: 719 case USB_EVENT_CHARGER: 720 twl4030_charger_enable_usb(bci, true); 721 break; 722 case USB_EVENT_NONE: 723 twl4030_charger_enable_usb(bci, false); 724 break; 725 } 726 } 727 728 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, 729 void *priv) 730 { 731 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); 732 733 dev_dbg(bci->dev, "OTG notify %lu\n", val); 734 735 /* reset current on each 'plug' event */ 736 if (allow_usb) 737 bci->usb_cur_target = 500000; 738 else 739 bci->usb_cur_target = 100000; 740 741 bci->event = val; 742 schedule_work(&bci->work); 743 744 return NOTIFY_OK; 745 } 746 747 /* 748 * sysfs charger enabled store 749 */ 750 static ssize_t 751 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr, 752 const char *buf, size_t n) 753 { 754 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 755 int mode; 756 int status; 757 758 if (sysfs_streq(buf, modes[0])) 759 mode = 0; 760 else if (sysfs_streq(buf, modes[1])) 761 mode = 1; 762 else if (sysfs_streq(buf, modes[2])) 763 mode = 2; 764 else 765 return -EINVAL; 766 if (dev == &bci->ac->dev) { 767 if (mode == 2) 768 return -EINVAL; 769 twl4030_charger_enable_ac(bci, false); 770 bci->ac_mode = mode; 771 status = twl4030_charger_enable_ac(bci, true); 772 } else { 773 twl4030_charger_enable_usb(bci, false); 774 bci->usb_mode = mode; 775 status = twl4030_charger_enable_usb(bci, true); 776 } 777 return (status == 0) ? n : status; 778 } 779 780 /* 781 * sysfs charger enabled show 782 */ 783 static ssize_t 784 twl4030_bci_mode_show(struct device *dev, 785 struct device_attribute *attr, char *buf) 786 { 787 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 788 int len = 0; 789 int i; 790 int mode = bci->usb_mode; 791 792 if (dev == &bci->ac->dev) 793 mode = bci->ac_mode; 794 795 for (i = 0; i < ARRAY_SIZE(modes); i++) 796 if (mode == i) 797 len += snprintf(buf+len, PAGE_SIZE-len, 798 "[%s] ", modes[i]); 799 else 800 len += snprintf(buf+len, PAGE_SIZE-len, 801 "%s ", modes[i]); 802 buf[len-1] = '\n'; 803 return len; 804 } 805 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show, 806 twl4030_bci_mode_store); 807 808 static int twl4030_charger_get_current(void) 809 { 810 int curr; 811 int ret; 812 u8 bcictl1; 813 814 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); 815 if (curr < 0) 816 return curr; 817 818 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 819 if (ret) 820 return ret; 821 822 return regval2ua(curr, bcictl1 & TWL4030_CGAIN); 823 } 824 825 /* 826 * Returns the main charge FSM state 827 * Or < 0 on failure. 828 */ 829 static int twl4030bci_state(struct twl4030_bci *bci) 830 { 831 int ret; 832 u8 state; 833 834 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); 835 if (ret) { 836 pr_err("twl4030_bci: error reading BCIMSTATEC\n"); 837 return ret; 838 } 839 840 dev_dbg(bci->dev, "state: %02x\n", state); 841 842 return state; 843 } 844 845 static int twl4030_bci_state_to_status(int state) 846 { 847 state &= TWL4030_MSTATEC_MASK; 848 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) 849 return POWER_SUPPLY_STATUS_CHARGING; 850 else if (TWL4030_MSTATEC_COMPLETE1 <= state && 851 state <= TWL4030_MSTATEC_COMPLETE4) 852 return POWER_SUPPLY_STATUS_FULL; 853 else 854 return POWER_SUPPLY_STATUS_NOT_CHARGING; 855 } 856 857 static int twl4030_bci_get_property(struct power_supply *psy, 858 enum power_supply_property psp, 859 union power_supply_propval *val) 860 { 861 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 862 int is_charging; 863 int state; 864 int ret; 865 866 state = twl4030bci_state(bci); 867 if (state < 0) 868 return state; 869 870 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 871 is_charging = state & TWL4030_MSTATEC_USB; 872 else 873 is_charging = state & TWL4030_MSTATEC_AC; 874 if (!is_charging) { 875 u8 s; 876 twl4030_bci_read(TWL4030_BCIMDEN, &s); 877 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 878 is_charging = s & 1; 879 else 880 is_charging = s & 2; 881 if (is_charging) 882 /* A little white lie */ 883 state = TWL4030_MSTATEC_QUICK1; 884 } 885 886 switch (psp) { 887 case POWER_SUPPLY_PROP_STATUS: 888 if (is_charging) 889 val->intval = twl4030_bci_state_to_status(state); 890 else 891 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 892 break; 893 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 894 /* charging must be active for meaningful result */ 895 if (!is_charging) 896 return -ENODATA; 897 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) { 898 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 899 if (ret < 0) 900 return ret; 901 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 902 val->intval = ret * 6843; 903 } else { 904 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); 905 if (ret < 0) 906 return ret; 907 /* BCIVAC uses ADCIN11, 10/1023 V/step */ 908 val->intval = ret * 9775; 909 } 910 break; 911 case POWER_SUPPLY_PROP_CURRENT_NOW: 912 if (!is_charging) 913 return -ENODATA; 914 /* current measurement is shared between AC and USB */ 915 ret = twl4030_charger_get_current(); 916 if (ret < 0) 917 return ret; 918 val->intval = ret; 919 break; 920 case POWER_SUPPLY_PROP_ONLINE: 921 val->intval = is_charging && 922 twl4030_bci_state_to_status(state) != 923 POWER_SUPPLY_STATUS_NOT_CHARGING; 924 break; 925 default: 926 return -EINVAL; 927 } 928 929 return 0; 930 } 931 932 static enum power_supply_property twl4030_charger_props[] = { 933 POWER_SUPPLY_PROP_STATUS, 934 POWER_SUPPLY_PROP_ONLINE, 935 POWER_SUPPLY_PROP_VOLTAGE_NOW, 936 POWER_SUPPLY_PROP_CURRENT_NOW, 937 }; 938 939 #ifdef CONFIG_OF 940 static const struct twl4030_bci_platform_data * 941 twl4030_bci_parse_dt(struct device *dev) 942 { 943 struct device_node *np = dev->of_node; 944 struct twl4030_bci_platform_data *pdata; 945 u32 num; 946 947 if (!np) 948 return NULL; 949 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 950 if (!pdata) 951 return pdata; 952 953 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0) 954 pdata->bb_uvolt = num; 955 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0) 956 pdata->bb_uamp = num; 957 return pdata; 958 } 959 #else 960 static inline const struct twl4030_bci_platform_data * 961 twl4030_bci_parse_dt(struct device *dev) 962 { 963 return NULL; 964 } 965 #endif 966 967 static const struct power_supply_desc twl4030_bci_ac_desc = { 968 .name = "twl4030_ac", 969 .type = POWER_SUPPLY_TYPE_MAINS, 970 .properties = twl4030_charger_props, 971 .num_properties = ARRAY_SIZE(twl4030_charger_props), 972 .get_property = twl4030_bci_get_property, 973 }; 974 975 static const struct power_supply_desc twl4030_bci_usb_desc = { 976 .name = "twl4030_usb", 977 .type = POWER_SUPPLY_TYPE_USB, 978 .properties = twl4030_charger_props, 979 .num_properties = ARRAY_SIZE(twl4030_charger_props), 980 .get_property = twl4030_bci_get_property, 981 }; 982 983 static int twl4030_bci_probe(struct platform_device *pdev) 984 { 985 struct twl4030_bci *bci; 986 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; 987 int ret; 988 u32 reg; 989 990 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL); 991 if (bci == NULL) 992 return -ENOMEM; 993 994 if (!pdata) 995 pdata = twl4030_bci_parse_dt(&pdev->dev); 996 997 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */ 998 bci->ichg_lo = 241000; /* Low threshold */ 999 bci->ichg_hi = 500000; /* High threshold */ 1000 bci->ac_cur = 500000; /* 500mA */ 1001 if (allow_usb) 1002 bci->usb_cur_target = 500000; /* 500mA */ 1003 else 1004 bci->usb_cur_target = 100000; /* 100mA */ 1005 bci->usb_mode = CHARGE_AUTO; 1006 bci->ac_mode = CHARGE_AUTO; 1007 1008 bci->dev = &pdev->dev; 1009 bci->irq_chg = platform_get_irq(pdev, 0); 1010 bci->irq_bci = platform_get_irq(pdev, 1); 1011 1012 /* Only proceed further *IF* battery is physically present */ 1013 ret = twl4030_is_battery_present(bci); 1014 if (ret) { 1015 dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret); 1016 return ret; 1017 } 1018 1019 platform_set_drvdata(pdev, bci); 1020 1021 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc, 1022 NULL); 1023 if (IS_ERR(bci->ac)) { 1024 ret = PTR_ERR(bci->ac); 1025 dev_err(&pdev->dev, "failed to register ac: %d\n", ret); 1026 return ret; 1027 } 1028 1029 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc, 1030 NULL); 1031 if (IS_ERR(bci->usb)) { 1032 ret = PTR_ERR(bci->usb); 1033 dev_err(&pdev->dev, "failed to register usb: %d\n", ret); 1034 return ret; 1035 } 1036 1037 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL, 1038 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, 1039 bci); 1040 if (ret < 0) { 1041 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1042 bci->irq_chg, ret); 1043 return ret; 1044 } 1045 1046 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL, 1047 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); 1048 if (ret < 0) { 1049 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1050 bci->irq_bci, ret); 1051 return ret; 1052 } 1053 1054 bci->channel_vac = iio_channel_get(&pdev->dev, "vac"); 1055 if (IS_ERR(bci->channel_vac)) { 1056 bci->channel_vac = NULL; 1057 dev_warn(&pdev->dev, "could not request vac iio channel"); 1058 } 1059 1060 INIT_WORK(&bci->work, twl4030_bci_usb_work); 1061 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker); 1062 1063 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; 1064 if (bci->dev->of_node) { 1065 struct device_node *phynode; 1066 1067 phynode = of_find_compatible_node(bci->dev->of_node->parent, 1068 NULL, "ti,twl4030-usb"); 1069 if (phynode) 1070 bci->transceiver = devm_usb_get_phy_by_node( 1071 bci->dev, phynode, &bci->usb_nb); 1072 } 1073 1074 /* Enable interrupts now. */ 1075 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | 1076 TWL4030_TBATOR1 | TWL4030_BATSTS); 1077 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 1078 TWL4030_INTERRUPTS_BCIIMR1A); 1079 if (ret < 0) { 1080 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 1081 goto fail; 1082 } 1083 1084 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); 1085 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 1086 TWL4030_INTERRUPTS_BCIIMR2A); 1087 if (ret < 0) 1088 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 1089 1090 twl4030_charger_update_current(bci); 1091 if (device_create_file(&bci->usb->dev, &dev_attr_max_current)) 1092 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1093 if (device_create_file(&bci->usb->dev, &dev_attr_mode)) 1094 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1095 if (device_create_file(&bci->ac->dev, &dev_attr_mode)) 1096 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1097 if (device_create_file(&bci->ac->dev, &dev_attr_max_current)) 1098 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1099 1100 twl4030_charger_enable_ac(bci, true); 1101 if (!IS_ERR_OR_NULL(bci->transceiver)) 1102 twl4030_bci_usb_ncb(&bci->usb_nb, 1103 bci->transceiver->last_event, 1104 NULL); 1105 else 1106 twl4030_charger_enable_usb(bci, false); 1107 if (pdata) 1108 twl4030_charger_enable_backup(pdata->bb_uvolt, 1109 pdata->bb_uamp); 1110 else 1111 twl4030_charger_enable_backup(0, 0); 1112 1113 return 0; 1114 fail: 1115 iio_channel_release(bci->channel_vac); 1116 1117 return ret; 1118 } 1119 1120 static int __exit twl4030_bci_remove(struct platform_device *pdev) 1121 { 1122 struct twl4030_bci *bci = platform_get_drvdata(pdev); 1123 1124 twl4030_charger_enable_ac(bci, false); 1125 twl4030_charger_enable_usb(bci, false); 1126 twl4030_charger_enable_backup(0, 0); 1127 1128 iio_channel_release(bci->channel_vac); 1129 1130 device_remove_file(&bci->usb->dev, &dev_attr_max_current); 1131 device_remove_file(&bci->usb->dev, &dev_attr_mode); 1132 device_remove_file(&bci->ac->dev, &dev_attr_max_current); 1133 device_remove_file(&bci->ac->dev, &dev_attr_mode); 1134 /* mask interrupts */ 1135 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1136 TWL4030_INTERRUPTS_BCIIMR1A); 1137 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1138 TWL4030_INTERRUPTS_BCIIMR2A); 1139 1140 return 0; 1141 } 1142 1143 static const struct of_device_id twl_bci_of_match[] = { 1144 {.compatible = "ti,twl4030-bci", }, 1145 { } 1146 }; 1147 MODULE_DEVICE_TABLE(of, twl_bci_of_match); 1148 1149 static struct platform_driver twl4030_bci_driver = { 1150 .probe = twl4030_bci_probe, 1151 .driver = { 1152 .name = "twl4030_bci", 1153 .of_match_table = of_match_ptr(twl_bci_of_match), 1154 }, 1155 .remove = __exit_p(twl4030_bci_remove), 1156 }; 1157 module_platform_driver(twl4030_bci_driver); 1158 1159 MODULE_AUTHOR("Gražvydas Ignotas"); 1160 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); 1161 MODULE_LICENSE("GPL"); 1162 MODULE_ALIAS("platform:twl4030_bci"); 1163