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/mfd/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 const 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 * TI provided formulas: 210 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 211 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7 212 * Here we use integer approximation of: 213 * CGAIN == 0: val * 1.6618 - 0.85 * 1000 214 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2 215 */ 216 /* 217 * convert twl register value for currents into uA 218 */ 219 static int regval2ua(int regval, bool cgain) 220 { 221 if (cgain) 222 return (regval * 16618 - 8500 * 1000) / 5; 223 else 224 return (regval * 16618 - 8500 * 1000) / 10; 225 } 226 227 /* 228 * convert uA currents into twl register value 229 */ 230 static int ua2regval(int ua, bool cgain) 231 { 232 int ret; 233 if (cgain) 234 ua /= 2; 235 ret = (ua * 10 + 8500 * 1000) / 16618; 236 /* rounding problems */ 237 if (ret < 512) 238 ret = 512; 239 return ret; 240 } 241 242 static int twl4030_charger_update_current(struct twl4030_bci *bci) 243 { 244 int status; 245 int cur; 246 unsigned reg, cur_reg; 247 u8 bcictl1, oldreg, fullreg; 248 bool cgain = false; 249 u8 boot_bci; 250 251 /* 252 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11) 253 * and AC is enabled, set current for 'ac' 254 */ 255 if (ac_available(bci->channel_vac)) { 256 cur = bci->ac_cur; 257 bci->ac_is_active = true; 258 } else { 259 cur = bci->usb_cur; 260 bci->ac_is_active = false; 261 if (cur > bci->usb_cur_target) { 262 cur = bci->usb_cur_target; 263 bci->usb_cur = cur; 264 } 265 if (cur < bci->usb_cur_target) 266 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); 267 } 268 269 /* First, check thresholds and see if cgain is needed */ 270 if (bci->ichg_eoc >= 200000) 271 cgain = true; 272 if (bci->ichg_lo >= 400000) 273 cgain = true; 274 if (bci->ichg_hi >= 820000) 275 cgain = true; 276 if (cur > 852000) 277 cgain = true; 278 279 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 280 if (status < 0) 281 return status; 282 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci, 283 TWL4030_PM_MASTER_BOOT_BCI) < 0) 284 boot_bci = 0; 285 boot_bci &= 7; 286 287 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) 288 /* Need to turn for charging while we change the 289 * CGAIN bit. Leave it off while everything is 290 * updated. 291 */ 292 twl4030_clear_set_boot_bci(boot_bci, 0); 293 294 /* 295 * For ichg_eoc, the hardware only supports reg values matching 296 * 100XXXX000, and requires the XXXX be stored in the high nibble 297 * of TWL4030_BCIMFTH8. 298 */ 299 reg = ua2regval(bci->ichg_eoc, cgain); 300 if (reg > 0x278) 301 reg = 0x278; 302 if (reg < 0x200) 303 reg = 0x200; 304 reg = (reg >> 3) & 0xf; 305 fullreg = reg << 4; 306 307 /* 308 * For ichg_lo, reg value must match 10XXXX0000. 309 * XXXX is stored in low nibble of TWL4030_BCIMFTH8. 310 */ 311 reg = ua2regval(bci->ichg_lo, cgain); 312 if (reg > 0x2F0) 313 reg = 0x2F0; 314 if (reg < 0x200) 315 reg = 0x200; 316 reg = (reg >> 4) & 0xf; 317 fullreg |= reg; 318 319 /* ichg_eoc and ichg_lo live in same register */ 320 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg); 321 if (status < 0) 322 return status; 323 if (oldreg != fullreg) { 324 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4, 325 TWL4030_BCIMFKEY); 326 if (status < 0) 327 return status; 328 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 329 fullreg, TWL4030_BCIMFTH8); 330 } 331 332 /* ichg_hi threshold must be 1XXXX01100 (I think) */ 333 reg = ua2regval(bci->ichg_hi, cgain); 334 if (reg > 0x3E0) 335 reg = 0x3E0; 336 if (reg < 0x200) 337 reg = 0x200; 338 fullreg = (reg >> 5) & 0xF; 339 fullreg <<= 4; 340 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg); 341 if (status < 0) 342 return status; 343 if ((oldreg & 0xF0) != fullreg) { 344 fullreg |= (oldreg & 0x0F); 345 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 346 TWL4030_BCIMFKEY); 347 if (status < 0) 348 return status; 349 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 350 fullreg, TWL4030_BCIMFTH9); 351 } 352 353 /* 354 * And finally, set the current. This is stored in 355 * two registers. 356 */ 357 reg = ua2regval(cur, cgain); 358 /* we have only 10 bits */ 359 if (reg > 0x3ff) 360 reg = 0x3ff; 361 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg); 362 if (status < 0) 363 return status; 364 cur_reg = oldreg; 365 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg); 366 if (status < 0) 367 return status; 368 cur_reg |= oldreg << 8; 369 if (reg != oldreg) { 370 /* disable write protection for one write access for 371 * BCIIREF */ 372 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 373 TWL4030_BCIMFKEY); 374 if (status < 0) 375 return status; 376 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 377 (reg & 0x100) ? 3 : 2, 378 TWL4030_BCIIREF2); 379 if (status < 0) 380 return status; 381 /* disable write protection for one write access for 382 * BCIIREF */ 383 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 384 TWL4030_BCIMFKEY); 385 if (status < 0) 386 return status; 387 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 388 reg & 0xff, 389 TWL4030_BCIIREF1); 390 } 391 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) { 392 /* Flip CGAIN and re-enable charging */ 393 bcictl1 ^= TWL4030_CGAIN; 394 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 395 bcictl1, TWL4030_BCICTL1); 396 twl4030_clear_set_boot_bci(0, boot_bci); 397 } 398 return 0; 399 } 400 401 static int twl4030_charger_get_current(void); 402 403 static void twl4030_current_worker(struct work_struct *data) 404 { 405 int v, curr; 406 int res; 407 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, 408 current_worker.work); 409 410 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 411 if (res < 0) 412 v = 0; 413 else 414 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 415 v = res * 6843; 416 curr = twl4030_charger_get_current(); 417 418 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr, 419 bci->usb_cur, bci->usb_cur_target); 420 421 if (v < USB_MIN_VOLT) { 422 /* Back up and stop adjusting. */ 423 if (bci->usb_cur >= USB_CUR_STEP) 424 bci->usb_cur -= USB_CUR_STEP; 425 bci->usb_cur_target = bci->usb_cur; 426 } else if (bci->usb_cur >= bci->usb_cur_target || 427 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) { 428 /* Reached target and voltage is OK - stop */ 429 return; 430 } else { 431 bci->usb_cur += USB_CUR_STEP; 432 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); 433 } 434 twl4030_charger_update_current(bci); 435 } 436 437 /* 438 * Enable/Disable USB Charge functionality. 439 */ 440 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) 441 { 442 int ret; 443 u32 reg; 444 445 if (bci->usb_mode == CHARGE_OFF) 446 enable = false; 447 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) { 448 449 twl4030_charger_update_current(bci); 450 451 /* Need to keep phy powered */ 452 if (!bci->usb_enabled) { 453 pm_runtime_get_sync(bci->transceiver->dev); 454 bci->usb_enabled = 1; 455 } 456 457 if (bci->usb_mode == CHARGE_AUTO) { 458 /* Enable interrupts now. */ 459 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | 460 TWL4030_TBATOR2 | TWL4030_TBATOR1 | 461 TWL4030_BATSTS); 462 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 463 TWL4030_INTERRUPTS_BCIIMR1A); 464 if (ret < 0) { 465 dev_err(bci->dev, 466 "failed to unmask interrupts: %d\n", 467 ret); 468 return ret; 469 } 470 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ 471 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); 472 } 473 474 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ 475 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, 476 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); 477 if (bci->usb_mode == CHARGE_LINEAR) { 478 /* Enable interrupts now. */ 479 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 | 480 TWL4030_TBATOR1 | TWL4030_BATSTS); 481 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 482 TWL4030_INTERRUPTS_BCIIMR1A); 483 if (ret < 0) { 484 dev_err(bci->dev, 485 "failed to unmask interrupts: %d\n", 486 ret); 487 return ret; 488 } 489 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0); 490 /* Watch dog key: WOVF acknowledge */ 491 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33, 492 TWL4030_BCIWDKEY); 493 /* 0x24 + EKEY6: off mode */ 494 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 495 TWL4030_BCIMDKEY); 496 /* EKEY2: Linear charge: USB path */ 497 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26, 498 TWL4030_BCIMDKEY); 499 /* WDKEY5: stop watchdog count */ 500 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3, 501 TWL4030_BCIWDKEY); 502 /* enable MFEN3 access */ 503 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c, 504 TWL4030_BCIMFKEY); 505 /* ICHGEOCEN - end-of-charge monitor (current < 80mA) 506 * (charging continues) 507 * ICHGLOWEN - current level monitor (charge continues) 508 * don't monitor over-current or heat save 509 */ 510 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0, 511 TWL4030_BCIMFEN3); 512 } 513 } else { 514 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); 515 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 516 TWL4030_BCIMDKEY); 517 if (bci->usb_enabled) { 518 pm_runtime_mark_last_busy(bci->transceiver->dev); 519 pm_runtime_put_autosuspend(bci->transceiver->dev); 520 bci->usb_enabled = 0; 521 } 522 bci->usb_cur = 0; 523 } 524 525 return ret; 526 } 527 528 /* 529 * Enable/Disable AC Charge funtionality. 530 */ 531 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable) 532 { 533 int ret; 534 535 if (bci->ac_mode == CHARGE_OFF) 536 enable = false; 537 538 if (enable) 539 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); 540 else 541 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); 542 543 return ret; 544 } 545 546 /* 547 * Enable/Disable charging of Backup Battery. 548 */ 549 static int twl4030_charger_enable_backup(int uvolt, int uamp) 550 { 551 int ret; 552 u8 flags; 553 554 if (uvolt < 2500000 || 555 uamp < 25) { 556 /* disable charging of backup battery */ 557 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 558 TWL4030_BBCHEN, 0, TWL4030_BB_CFG); 559 return ret; 560 } 561 562 flags = TWL4030_BBCHEN; 563 if (uvolt >= 3200000) 564 flags |= TWL4030_BBSEL_3V2; 565 else if (uvolt >= 3100000) 566 flags |= TWL4030_BBSEL_3V1; 567 else if (uvolt >= 3000000) 568 flags |= TWL4030_BBSEL_3V0; 569 else 570 flags |= TWL4030_BBSEL_2V5; 571 572 if (uamp >= 1000) 573 flags |= TWL4030_BBISEL_1000uA; 574 else if (uamp >= 500) 575 flags |= TWL4030_BBISEL_500uA; 576 else if (uamp >= 150) 577 flags |= TWL4030_BBISEL_150uA; 578 else 579 flags |= TWL4030_BBISEL_25uA; 580 581 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 582 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, 583 flags, 584 TWL4030_BB_CFG); 585 586 return ret; 587 } 588 589 /* 590 * TWL4030 CHG_PRES (AC charger presence) events 591 */ 592 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) 593 { 594 struct twl4030_bci *bci = arg; 595 596 dev_dbg(bci->dev, "CHG_PRES irq\n"); 597 /* reset current on each 'plug' event */ 598 bci->ac_cur = 500000; 599 twl4030_charger_update_current(bci); 600 power_supply_changed(bci->ac); 601 power_supply_changed(bci->usb); 602 603 return IRQ_HANDLED; 604 } 605 606 /* 607 * TWL4030 BCI monitoring events 608 */ 609 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) 610 { 611 struct twl4030_bci *bci = arg; 612 u8 irqs1, irqs2; 613 int ret; 614 615 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, 616 TWL4030_INTERRUPTS_BCIISR1A); 617 if (ret < 0) 618 return IRQ_HANDLED; 619 620 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, 621 TWL4030_INTERRUPTS_BCIISR2A); 622 if (ret < 0) 623 return IRQ_HANDLED; 624 625 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); 626 627 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { 628 /* charger state change, inform the core */ 629 power_supply_changed(bci->ac); 630 power_supply_changed(bci->usb); 631 } 632 twl4030_charger_update_current(bci); 633 634 /* various monitoring events, for now we just log them here */ 635 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) 636 dev_warn(bci->dev, "battery temperature out of range\n"); 637 638 if (irqs1 & TWL4030_BATSTS) 639 dev_crit(bci->dev, "battery disconnected\n"); 640 641 if (irqs2 & TWL4030_VBATOV) 642 dev_crit(bci->dev, "VBAT overvoltage\n"); 643 644 if (irqs2 & TWL4030_VBUSOV) 645 dev_crit(bci->dev, "VBUS overvoltage\n"); 646 647 if (irqs2 & TWL4030_ACCHGOV) 648 dev_crit(bci->dev, "Ac charger overvoltage\n"); 649 650 return IRQ_HANDLED; 651 } 652 653 static void twl4030_bci_usb_work(struct work_struct *data) 654 { 655 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); 656 657 switch (bci->event) { 658 case USB_EVENT_VBUS: 659 case USB_EVENT_CHARGER: 660 twl4030_charger_enable_usb(bci, true); 661 break; 662 case USB_EVENT_NONE: 663 twl4030_charger_enable_usb(bci, false); 664 break; 665 } 666 } 667 668 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, 669 void *priv) 670 { 671 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); 672 673 dev_dbg(bci->dev, "OTG notify %lu\n", val); 674 675 /* reset current on each 'plug' event */ 676 if (allow_usb) 677 bci->usb_cur_target = 500000; 678 else 679 bci->usb_cur_target = 100000; 680 681 bci->event = val; 682 schedule_work(&bci->work); 683 684 return NOTIFY_OK; 685 } 686 687 /* 688 * sysfs charger enabled store 689 */ 690 static ssize_t 691 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr, 692 const char *buf, size_t n) 693 { 694 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 695 int mode; 696 int status; 697 698 mode = sysfs_match_string(modes, buf); 699 if (mode < 0) 700 return mode; 701 702 if (dev == &bci->ac->dev) { 703 if (mode == 2) 704 return -EINVAL; 705 twl4030_charger_enable_ac(bci, false); 706 bci->ac_mode = mode; 707 status = twl4030_charger_enable_ac(bci, true); 708 } else { 709 twl4030_charger_enable_usb(bci, false); 710 bci->usb_mode = mode; 711 status = twl4030_charger_enable_usb(bci, true); 712 } 713 return (status == 0) ? n : status; 714 } 715 716 /* 717 * sysfs charger enabled show 718 */ 719 static ssize_t 720 twl4030_bci_mode_show(struct device *dev, 721 struct device_attribute *attr, char *buf) 722 { 723 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 724 int len = 0; 725 int i; 726 int mode = bci->usb_mode; 727 728 if (dev == &bci->ac->dev) 729 mode = bci->ac_mode; 730 731 for (i = 0; i < ARRAY_SIZE(modes); i++) 732 if (mode == i) 733 len += snprintf(buf+len, PAGE_SIZE-len, 734 "[%s] ", modes[i]); 735 else 736 len += snprintf(buf+len, PAGE_SIZE-len, 737 "%s ", modes[i]); 738 buf[len-1] = '\n'; 739 return len; 740 } 741 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show, 742 twl4030_bci_mode_store); 743 744 static int twl4030_charger_get_current(void) 745 { 746 int curr; 747 int ret; 748 u8 bcictl1; 749 750 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); 751 if (curr < 0) 752 return curr; 753 754 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 755 if (ret) 756 return ret; 757 758 return regval2ua(curr, bcictl1 & TWL4030_CGAIN); 759 } 760 761 /* 762 * Returns the main charge FSM state 763 * Or < 0 on failure. 764 */ 765 static int twl4030bci_state(struct twl4030_bci *bci) 766 { 767 int ret; 768 u8 state; 769 770 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); 771 if (ret) { 772 dev_err(bci->dev, "error reading BCIMSTATEC\n"); 773 return ret; 774 } 775 776 dev_dbg(bci->dev, "state: %02x\n", state); 777 778 return state; 779 } 780 781 static int twl4030_bci_state_to_status(int state) 782 { 783 state &= TWL4030_MSTATEC_MASK; 784 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) 785 return POWER_SUPPLY_STATUS_CHARGING; 786 else if (TWL4030_MSTATEC_COMPLETE1 <= state && 787 state <= TWL4030_MSTATEC_COMPLETE4) 788 return POWER_SUPPLY_STATUS_FULL; 789 else 790 return POWER_SUPPLY_STATUS_NOT_CHARGING; 791 } 792 793 static int twl4030_bci_get_property(struct power_supply *psy, 794 enum power_supply_property psp, 795 union power_supply_propval *val) 796 { 797 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 798 int is_charging; 799 int state; 800 int ret; 801 802 state = twl4030bci_state(bci); 803 if (state < 0) 804 return state; 805 806 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 807 is_charging = state & TWL4030_MSTATEC_USB; 808 else 809 is_charging = state & TWL4030_MSTATEC_AC; 810 if (!is_charging) { 811 u8 s; 812 ret = twl4030_bci_read(TWL4030_BCIMDEN, &s); 813 if (ret < 0) 814 return ret; 815 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 816 is_charging = s & 1; 817 else 818 is_charging = s & 2; 819 if (is_charging) 820 /* A little white lie */ 821 state = TWL4030_MSTATEC_QUICK1; 822 } 823 824 switch (psp) { 825 case POWER_SUPPLY_PROP_STATUS: 826 if (is_charging) 827 val->intval = twl4030_bci_state_to_status(state); 828 else 829 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 830 break; 831 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 832 /* charging must be active for meaningful result */ 833 if (!is_charging) 834 return -ENODATA; 835 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) { 836 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 837 if (ret < 0) 838 return ret; 839 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 840 val->intval = ret * 6843; 841 } else { 842 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); 843 if (ret < 0) 844 return ret; 845 /* BCIVAC uses ADCIN11, 10/1023 V/step */ 846 val->intval = ret * 9775; 847 } 848 break; 849 case POWER_SUPPLY_PROP_CURRENT_NOW: 850 if (!is_charging) 851 return -ENODATA; 852 /* current measurement is shared between AC and USB */ 853 ret = twl4030_charger_get_current(); 854 if (ret < 0) 855 return ret; 856 val->intval = ret; 857 break; 858 case POWER_SUPPLY_PROP_ONLINE: 859 val->intval = is_charging && 860 twl4030_bci_state_to_status(state) != 861 POWER_SUPPLY_STATUS_NOT_CHARGING; 862 break; 863 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 864 val->intval = -1; 865 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) { 866 if (!bci->ac_is_active) 867 val->intval = bci->ac_cur; 868 } else { 869 if (bci->ac_is_active) 870 val->intval = bci->usb_cur_target; 871 } 872 if (val->intval < 0) { 873 u8 bcictl1; 874 875 val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1); 876 if (val->intval < 0) 877 return val->intval; 878 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 879 if (ret < 0) 880 return ret; 881 val->intval = regval2ua(val->intval, bcictl1 & 882 TWL4030_CGAIN); 883 } 884 break; 885 default: 886 return -EINVAL; 887 } 888 889 return 0; 890 } 891 892 static int twl4030_bci_set_property(struct power_supply *psy, 893 enum power_supply_property psp, 894 const union power_supply_propval *val) 895 { 896 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 897 898 switch (psp) { 899 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 900 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 901 bci->usb_cur_target = val->intval; 902 else 903 bci->ac_cur = val->intval; 904 twl4030_charger_update_current(bci); 905 break; 906 default: 907 return -EINVAL; 908 } 909 910 return 0; 911 } 912 913 static int twl4030_bci_property_is_writeable(struct power_supply *psy, 914 enum power_supply_property psp) 915 { 916 switch (psp) { 917 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 918 return true; 919 default: 920 return false; 921 } 922 } 923 924 static enum power_supply_property twl4030_charger_props[] = { 925 POWER_SUPPLY_PROP_STATUS, 926 POWER_SUPPLY_PROP_ONLINE, 927 POWER_SUPPLY_PROP_VOLTAGE_NOW, 928 POWER_SUPPLY_PROP_CURRENT_NOW, 929 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 930 }; 931 932 #ifdef CONFIG_OF 933 static const struct twl4030_bci_platform_data * 934 twl4030_bci_parse_dt(struct device *dev) 935 { 936 struct device_node *np = dev->of_node; 937 struct twl4030_bci_platform_data *pdata; 938 u32 num; 939 940 if (!np) 941 return NULL; 942 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 943 if (!pdata) 944 return pdata; 945 946 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0) 947 pdata->bb_uvolt = num; 948 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0) 949 pdata->bb_uamp = num; 950 return pdata; 951 } 952 #else 953 static inline const struct twl4030_bci_platform_data * 954 twl4030_bci_parse_dt(struct device *dev) 955 { 956 return NULL; 957 } 958 #endif 959 960 static const struct power_supply_desc twl4030_bci_ac_desc = { 961 .name = "twl4030_ac", 962 .type = POWER_SUPPLY_TYPE_MAINS, 963 .properties = twl4030_charger_props, 964 .num_properties = ARRAY_SIZE(twl4030_charger_props), 965 .get_property = twl4030_bci_get_property, 966 .set_property = twl4030_bci_set_property, 967 .property_is_writeable = twl4030_bci_property_is_writeable, 968 }; 969 970 static const struct power_supply_desc twl4030_bci_usb_desc = { 971 .name = "twl4030_usb", 972 .type = POWER_SUPPLY_TYPE_USB, 973 .properties = twl4030_charger_props, 974 .num_properties = ARRAY_SIZE(twl4030_charger_props), 975 .get_property = twl4030_bci_get_property, 976 .set_property = twl4030_bci_set_property, 977 .property_is_writeable = twl4030_bci_property_is_writeable, 978 }; 979 980 static int twl4030_bci_probe(struct platform_device *pdev) 981 { 982 struct twl4030_bci *bci; 983 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; 984 int ret; 985 u32 reg; 986 987 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL); 988 if (bci == NULL) 989 return -ENOMEM; 990 991 if (!pdata) 992 pdata = twl4030_bci_parse_dt(&pdev->dev); 993 994 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */ 995 bci->ichg_lo = 241000; /* Low threshold */ 996 bci->ichg_hi = 500000; /* High threshold */ 997 bci->ac_cur = 500000; /* 500mA */ 998 if (allow_usb) 999 bci->usb_cur_target = 500000; /* 500mA */ 1000 else 1001 bci->usb_cur_target = 100000; /* 100mA */ 1002 bci->usb_mode = CHARGE_AUTO; 1003 bci->ac_mode = CHARGE_AUTO; 1004 1005 bci->dev = &pdev->dev; 1006 bci->irq_chg = platform_get_irq(pdev, 0); 1007 bci->irq_bci = platform_get_irq(pdev, 1); 1008 1009 platform_set_drvdata(pdev, bci); 1010 1011 INIT_WORK(&bci->work, twl4030_bci_usb_work); 1012 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker); 1013 1014 bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac"); 1015 if (IS_ERR(bci->channel_vac)) { 1016 ret = PTR_ERR(bci->channel_vac); 1017 if (ret == -EPROBE_DEFER) 1018 return ret; /* iio not ready */ 1019 dev_warn(&pdev->dev, "could not request vac iio channel (%d)", 1020 ret); 1021 bci->channel_vac = NULL; 1022 } 1023 1024 if (bci->dev->of_node) { 1025 struct device_node *phynode; 1026 1027 phynode = of_get_compatible_child(bci->dev->of_node->parent, 1028 "ti,twl4030-usb"); 1029 if (phynode) { 1030 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; 1031 bci->transceiver = devm_usb_get_phy_by_node( 1032 bci->dev, phynode, &bci->usb_nb); 1033 of_node_put(phynode); 1034 if (IS_ERR(bci->transceiver)) { 1035 ret = PTR_ERR(bci->transceiver); 1036 if (ret == -EPROBE_DEFER) 1037 return ret; /* phy not ready */ 1038 dev_warn(&pdev->dev, "could not request transceiver (%d)", 1039 ret); 1040 bci->transceiver = NULL; 1041 } 1042 } 1043 } 1044 1045 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc, 1046 NULL); 1047 if (IS_ERR(bci->ac)) { 1048 ret = PTR_ERR(bci->ac); 1049 dev_err(&pdev->dev, "failed to register ac: %d\n", ret); 1050 return ret; 1051 } 1052 1053 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc, 1054 NULL); 1055 if (IS_ERR(bci->usb)) { 1056 ret = PTR_ERR(bci->usb); 1057 dev_err(&pdev->dev, "failed to register usb: %d\n", ret); 1058 return ret; 1059 } 1060 1061 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL, 1062 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, 1063 bci); 1064 if (ret < 0) { 1065 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1066 bci->irq_chg, ret); 1067 return ret; 1068 } 1069 1070 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL, 1071 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); 1072 if (ret < 0) { 1073 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1074 bci->irq_bci, ret); 1075 return ret; 1076 } 1077 1078 /* Enable interrupts now. */ 1079 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | 1080 TWL4030_TBATOR1 | TWL4030_BATSTS); 1081 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 1082 TWL4030_INTERRUPTS_BCIIMR1A); 1083 if (ret < 0) { 1084 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 1085 return ret; 1086 } 1087 1088 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); 1089 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 1090 TWL4030_INTERRUPTS_BCIIMR2A); 1091 if (ret < 0) 1092 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 1093 1094 twl4030_charger_update_current(bci); 1095 if (device_create_file(&bci->usb->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_mode)) 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 } 1115 1116 static int twl4030_bci_remove(struct platform_device *pdev) 1117 { 1118 struct twl4030_bci *bci = platform_get_drvdata(pdev); 1119 1120 twl4030_charger_enable_ac(bci, false); 1121 twl4030_charger_enable_usb(bci, false); 1122 twl4030_charger_enable_backup(0, 0); 1123 1124 device_remove_file(&bci->usb->dev, &dev_attr_mode); 1125 device_remove_file(&bci->ac->dev, &dev_attr_mode); 1126 /* mask interrupts */ 1127 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1128 TWL4030_INTERRUPTS_BCIIMR1A); 1129 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1130 TWL4030_INTERRUPTS_BCIIMR2A); 1131 1132 return 0; 1133 } 1134 1135 static const struct of_device_id twl_bci_of_match[] = { 1136 {.compatible = "ti,twl4030-bci", }, 1137 { } 1138 }; 1139 MODULE_DEVICE_TABLE(of, twl_bci_of_match); 1140 1141 static struct platform_driver twl4030_bci_driver = { 1142 .probe = twl4030_bci_probe, 1143 .remove = twl4030_bci_remove, 1144 .driver = { 1145 .name = "twl4030_bci", 1146 .of_match_table = of_match_ptr(twl_bci_of_match), 1147 }, 1148 }; 1149 module_platform_driver(twl4030_bci_driver); 1150 1151 MODULE_AUTHOR("Gražvydas Ignotas"); 1152 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); 1153 MODULE_LICENSE("GPL"); 1154 MODULE_ALIAS("platform:twl4030_bci"); 1155