1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * TWL4030/TPS65950 BCI (Battery Charger Interface) driver 4 * 5 * Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com> 6 * 7 * based on twl4030_bci_battery.c by TI 8 * Copyright (C) 2008 Texas Instruments, Inc. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/err.h> 15 #include <linux/platform_device.h> 16 #include <linux/interrupt.h> 17 #include <linux/mfd/twl.h> 18 #include <linux/power_supply.h> 19 #include <linux/notifier.h> 20 #include <linux/usb/otg.h> 21 #include <linux/iio/consumer.h> 22 23 #define TWL4030_BCIMDEN 0x00 24 #define TWL4030_BCIMDKEY 0x01 25 #define TWL4030_BCIMSTATEC 0x02 26 #define TWL4030_BCIICHG 0x08 27 #define TWL4030_BCIVAC 0x0a 28 #define TWL4030_BCIVBUS 0x0c 29 #define TWL4030_BCIMFSTS3 0x0F 30 #define TWL4030_BCIMFSTS4 0x10 31 #define TWL4030_BCICTL1 0x23 32 #define TWL4030_BB_CFG 0x12 33 #define TWL4030_BCIIREF1 0x27 34 #define TWL4030_BCIIREF2 0x28 35 #define TWL4030_BCIMFKEY 0x11 36 #define TWL4030_BCIMFEN3 0x14 37 #define TWL4030_BCIMFTH8 0x1d 38 #define TWL4030_BCIMFTH9 0x1e 39 #define TWL4030_BCIWDKEY 0x21 40 41 #define TWL4030_BCIMFSTS1 0x01 42 43 #define TWL4030_BCIAUTOWEN BIT(5) 44 #define TWL4030_CONFIG_DONE BIT(4) 45 #define TWL4030_CVENAC BIT(2) 46 #define TWL4030_BCIAUTOUSB BIT(1) 47 #define TWL4030_BCIAUTOAC BIT(0) 48 #define TWL4030_CGAIN BIT(5) 49 #define TWL4030_USBFASTMCHG BIT(2) 50 #define TWL4030_STS_VBUS BIT(7) 51 #define TWL4030_STS_USB_ID BIT(2) 52 #define TWL4030_BBCHEN BIT(4) 53 #define TWL4030_BBSEL_MASK 0x0c 54 #define TWL4030_BBSEL_2V5 0x00 55 #define TWL4030_BBSEL_3V0 0x04 56 #define TWL4030_BBSEL_3V1 0x08 57 #define TWL4030_BBSEL_3V2 0x0c 58 #define TWL4030_BBISEL_MASK 0x03 59 #define TWL4030_BBISEL_25uA 0x00 60 #define TWL4030_BBISEL_150uA 0x01 61 #define TWL4030_BBISEL_500uA 0x02 62 #define TWL4030_BBISEL_1000uA 0x03 63 64 #define TWL4030_BATSTSPCHG BIT(2) 65 #define TWL4030_BATSTSMCHG BIT(6) 66 67 /* BCI interrupts */ 68 #define TWL4030_WOVF BIT(0) /* Watchdog overflow */ 69 #define TWL4030_TMOVF BIT(1) /* Timer overflow */ 70 #define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */ 71 #define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */ 72 #define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */ 73 #define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */ 74 #define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */ 75 #define TWL4030_BATSTS BIT(7) /* Battery status */ 76 77 #define TWL4030_VBATLVL BIT(0) /* VBAT level */ 78 #define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */ 79 #define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */ 80 #define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */ 81 82 #define TWL4030_MSTATEC_USB BIT(4) 83 #define TWL4030_MSTATEC_AC BIT(5) 84 #define TWL4030_MSTATEC_MASK 0x0f 85 #define TWL4030_MSTATEC_QUICK1 0x02 86 #define TWL4030_MSTATEC_QUICK7 0x07 87 #define TWL4030_MSTATEC_COMPLETE1 0x0b 88 #define TWL4030_MSTATEC_COMPLETE4 0x0e 89 90 /* 91 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11) 92 * then AC is available. 93 */ 94 static inline int ac_available(struct iio_channel *channel_vac) 95 { 96 int val, err; 97 98 if (!channel_vac) 99 return 0; 100 101 err = iio_read_channel_processed(channel_vac, &val); 102 if (err < 0) 103 return 0; 104 return val > 4500; 105 } 106 107 static bool allow_usb; 108 module_param(allow_usb, bool, 0644); 109 MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current"); 110 111 struct twl4030_bci { 112 struct device *dev; 113 struct power_supply *ac; 114 struct power_supply *usb; 115 struct usb_phy *transceiver; 116 struct notifier_block usb_nb; 117 struct work_struct work; 118 int irq_chg; 119 int irq_bci; 120 int usb_enabled; 121 122 /* 123 * ichg_* and *_cur values in uA. If any are 'large', we set 124 * CGAIN to '1' which doubles the range for half the 125 * precision. 126 */ 127 unsigned int ichg_eoc, ichg_lo, ichg_hi; 128 unsigned int usb_cur, ac_cur; 129 struct iio_channel *channel_vac; 130 bool ac_is_active; 131 int usb_mode, ac_mode; /* charging mode requested */ 132 #define CHARGE_OFF 0 133 #define CHARGE_AUTO 1 134 #define CHARGE_LINEAR 2 135 136 /* When setting the USB current we slowly increase the 137 * requested current until target is reached or the voltage 138 * drops below 4.75V. In the latter case we step back one 139 * step. 140 */ 141 unsigned int usb_cur_target; 142 struct delayed_work current_worker; 143 #define USB_CUR_STEP 20000 /* 20mA at a time */ 144 #define USB_MIN_VOLT 4750000 /* 4.75V */ 145 #define USB_CUR_DELAY msecs_to_jiffies(100) 146 #define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */ 147 148 unsigned long event; 149 }; 150 151 /* strings for 'usb_mode' values */ 152 static const char *modes[] = { "off", "auto", "continuous" }; 153 154 /* 155 * clear and set bits on an given register on a given module 156 */ 157 static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg) 158 { 159 u8 val = 0; 160 int ret; 161 162 ret = twl_i2c_read_u8(mod_no, &val, reg); 163 if (ret) 164 return ret; 165 166 val &= ~clear; 167 val |= set; 168 169 return twl_i2c_write_u8(mod_no, val, reg); 170 } 171 172 static int twl4030_bci_read(u8 reg, u8 *val) 173 { 174 return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg); 175 } 176 177 static int twl4030_clear_set_boot_bci(u8 clear, u8 set) 178 { 179 return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear, 180 TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set, 181 TWL4030_PM_MASTER_BOOT_BCI); 182 } 183 184 static int twl4030bci_read_adc_val(u8 reg) 185 { 186 int ret, temp; 187 u8 val; 188 189 /* read MSB */ 190 ret = twl4030_bci_read(reg + 1, &val); 191 if (ret) 192 return ret; 193 194 temp = (int)(val & 0x03) << 8; 195 196 /* read LSB */ 197 ret = twl4030_bci_read(reg, &val); 198 if (ret) 199 return ret; 200 201 return temp | val; 202 } 203 204 /* 205 * TI provided formulas: 206 * CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85 207 * CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7 208 * Here we use integer approximation of: 209 * CGAIN == 0: val * 1.6618 - 0.85 * 1000 210 * CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2 211 */ 212 /* 213 * convert twl register value for currents into uA 214 */ 215 static int regval2ua(int regval, bool cgain) 216 { 217 if (cgain) 218 return (regval * 16618 - 8500 * 1000) / 5; 219 else 220 return (regval * 16618 - 8500 * 1000) / 10; 221 } 222 223 /* 224 * convert uA currents into twl register value 225 */ 226 static int ua2regval(int ua, bool cgain) 227 { 228 int ret; 229 if (cgain) 230 ua /= 2; 231 ret = (ua * 10 + 8500 * 1000) / 16618; 232 /* rounding problems */ 233 if (ret < 512) 234 ret = 512; 235 return ret; 236 } 237 238 static int twl4030_charger_update_current(struct twl4030_bci *bci) 239 { 240 int status; 241 int cur; 242 unsigned reg, cur_reg; 243 u8 bcictl1, oldreg, fullreg; 244 bool cgain = false; 245 u8 boot_bci; 246 247 /* 248 * If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11) 249 * and AC is enabled, set current for 'ac' 250 */ 251 if (ac_available(bci->channel_vac)) { 252 cur = bci->ac_cur; 253 bci->ac_is_active = true; 254 } else { 255 cur = bci->usb_cur; 256 bci->ac_is_active = false; 257 if (cur > bci->usb_cur_target) { 258 cur = bci->usb_cur_target; 259 bci->usb_cur = cur; 260 } 261 if (cur < bci->usb_cur_target) 262 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); 263 } 264 265 /* First, check thresholds and see if cgain is needed */ 266 if (bci->ichg_eoc >= 200000) 267 cgain = true; 268 if (bci->ichg_lo >= 400000) 269 cgain = true; 270 if (bci->ichg_hi >= 820000) 271 cgain = true; 272 if (cur > 852000) 273 cgain = true; 274 275 status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 276 if (status < 0) 277 return status; 278 if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci, 279 TWL4030_PM_MASTER_BOOT_BCI) < 0) 280 boot_bci = 0; 281 boot_bci &= 7; 282 283 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) 284 /* Need to turn for charging while we change the 285 * CGAIN bit. Leave it off while everything is 286 * updated. 287 */ 288 twl4030_clear_set_boot_bci(boot_bci, 0); 289 290 /* 291 * For ichg_eoc, the hardware only supports reg values matching 292 * 100XXXX000, and requires the XXXX be stored in the high nibble 293 * of TWL4030_BCIMFTH8. 294 */ 295 reg = ua2regval(bci->ichg_eoc, cgain); 296 if (reg > 0x278) 297 reg = 0x278; 298 if (reg < 0x200) 299 reg = 0x200; 300 reg = (reg >> 3) & 0xf; 301 fullreg = reg << 4; 302 303 /* 304 * For ichg_lo, reg value must match 10XXXX0000. 305 * XXXX is stored in low nibble of TWL4030_BCIMFTH8. 306 */ 307 reg = ua2regval(bci->ichg_lo, cgain); 308 if (reg > 0x2F0) 309 reg = 0x2F0; 310 if (reg < 0x200) 311 reg = 0x200; 312 reg = (reg >> 4) & 0xf; 313 fullreg |= reg; 314 315 /* ichg_eoc and ichg_lo live in same register */ 316 status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg); 317 if (status < 0) 318 return status; 319 if (oldreg != fullreg) { 320 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4, 321 TWL4030_BCIMFKEY); 322 if (status < 0) 323 return status; 324 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 325 fullreg, TWL4030_BCIMFTH8); 326 } 327 328 /* ichg_hi threshold must be 1XXXX01100 (I think) */ 329 reg = ua2regval(bci->ichg_hi, cgain); 330 if (reg > 0x3E0) 331 reg = 0x3E0; 332 if (reg < 0x200) 333 reg = 0x200; 334 fullreg = (reg >> 5) & 0xF; 335 fullreg <<= 4; 336 status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg); 337 if (status < 0) 338 return status; 339 if ((oldreg & 0xF0) != fullreg) { 340 fullreg |= (oldreg & 0x0F); 341 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 342 TWL4030_BCIMFKEY); 343 if (status < 0) 344 return status; 345 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 346 fullreg, TWL4030_BCIMFTH9); 347 } 348 349 /* 350 * And finally, set the current. This is stored in 351 * two registers. 352 */ 353 reg = ua2regval(cur, cgain); 354 /* we have only 10 bits */ 355 if (reg > 0x3ff) 356 reg = 0x3ff; 357 status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg); 358 if (status < 0) 359 return status; 360 cur_reg = oldreg; 361 status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg); 362 if (status < 0) 363 return status; 364 cur_reg |= oldreg << 8; 365 if (reg != oldreg) { 366 /* disable write protection for one write access for 367 * BCIIREF */ 368 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 369 TWL4030_BCIMFKEY); 370 if (status < 0) 371 return status; 372 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 373 (reg & 0x100) ? 3 : 2, 374 TWL4030_BCIIREF2); 375 if (status < 0) 376 return status; 377 /* disable write protection for one write access for 378 * BCIIREF */ 379 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7, 380 TWL4030_BCIMFKEY); 381 if (status < 0) 382 return status; 383 status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 384 reg & 0xff, 385 TWL4030_BCIIREF1); 386 } 387 if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) { 388 /* Flip CGAIN and re-enable charging */ 389 bcictl1 ^= TWL4030_CGAIN; 390 twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 391 bcictl1, TWL4030_BCICTL1); 392 twl4030_clear_set_boot_bci(0, boot_bci); 393 } 394 return 0; 395 } 396 397 static int twl4030_charger_get_current(void); 398 399 static void twl4030_current_worker(struct work_struct *data) 400 { 401 int v, curr; 402 int res; 403 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, 404 current_worker.work); 405 406 res = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 407 if (res < 0) 408 v = 0; 409 else 410 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 411 v = res * 6843; 412 curr = twl4030_charger_get_current(); 413 414 dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr, 415 bci->usb_cur, bci->usb_cur_target); 416 417 if (v < USB_MIN_VOLT) { 418 /* Back up and stop adjusting. */ 419 if (bci->usb_cur >= USB_CUR_STEP) 420 bci->usb_cur -= USB_CUR_STEP; 421 bci->usb_cur_target = bci->usb_cur; 422 } else if (bci->usb_cur >= bci->usb_cur_target || 423 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) { 424 /* Reached target and voltage is OK - stop */ 425 return; 426 } else { 427 bci->usb_cur += USB_CUR_STEP; 428 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); 429 } 430 twl4030_charger_update_current(bci); 431 } 432 433 /* 434 * Enable/Disable USB Charge functionality. 435 */ 436 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) 437 { 438 int ret; 439 u32 reg; 440 441 if (bci->usb_mode == CHARGE_OFF) 442 enable = false; 443 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) { 444 445 twl4030_charger_update_current(bci); 446 447 /* Need to keep phy powered */ 448 if (!bci->usb_enabled) { 449 pm_runtime_get_sync(bci->transceiver->dev); 450 bci->usb_enabled = 1; 451 } 452 453 if (bci->usb_mode == CHARGE_AUTO) { 454 /* Enable interrupts now. */ 455 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | 456 TWL4030_TBATOR2 | TWL4030_TBATOR1 | 457 TWL4030_BATSTS); 458 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 459 TWL4030_INTERRUPTS_BCIIMR1A); 460 if (ret < 0) { 461 dev_err(bci->dev, 462 "failed to unmask interrupts: %d\n", 463 ret); 464 return ret; 465 } 466 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ 467 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); 468 } 469 470 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ 471 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, 472 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); 473 if (bci->usb_mode == CHARGE_LINEAR) { 474 /* Enable interrupts now. */ 475 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_TBATOR2 | 476 TWL4030_TBATOR1 | TWL4030_BATSTS); 477 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 478 TWL4030_INTERRUPTS_BCIIMR1A); 479 if (ret < 0) { 480 dev_err(bci->dev, 481 "failed to unmask interrupts: %d\n", 482 ret); 483 return ret; 484 } 485 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0); 486 /* Watch dog key: WOVF acknowledge */ 487 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33, 488 TWL4030_BCIWDKEY); 489 /* 0x24 + EKEY6: off mode */ 490 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 491 TWL4030_BCIMDKEY); 492 /* EKEY2: Linear charge: USB path */ 493 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26, 494 TWL4030_BCIMDKEY); 495 /* WDKEY5: stop watchdog count */ 496 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3, 497 TWL4030_BCIWDKEY); 498 /* enable MFEN3 access */ 499 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c, 500 TWL4030_BCIMFKEY); 501 /* ICHGEOCEN - end-of-charge monitor (current < 80mA) 502 * (charging continues) 503 * ICHGLOWEN - current level monitor (charge continues) 504 * don't monitor over-current or heat save 505 */ 506 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0, 507 TWL4030_BCIMFEN3); 508 } 509 } else { 510 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); 511 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 512 TWL4030_BCIMDKEY); 513 if (bci->usb_enabled) { 514 pm_runtime_mark_last_busy(bci->transceiver->dev); 515 pm_runtime_put_autosuspend(bci->transceiver->dev); 516 bci->usb_enabled = 0; 517 } 518 bci->usb_cur = 0; 519 } 520 521 return ret; 522 } 523 524 /* 525 * Enable/Disable AC Charge funtionality. 526 */ 527 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable) 528 { 529 int ret; 530 531 if (bci->ac_mode == CHARGE_OFF) 532 enable = false; 533 534 if (enable) 535 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); 536 else 537 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); 538 539 return ret; 540 } 541 542 /* 543 * Enable/Disable charging of Backup Battery. 544 */ 545 static int twl4030_charger_enable_backup(int uvolt, int uamp) 546 { 547 int ret; 548 u8 flags; 549 550 if (uvolt < 2500000 || 551 uamp < 25) { 552 /* disable charging of backup battery */ 553 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 554 TWL4030_BBCHEN, 0, TWL4030_BB_CFG); 555 return ret; 556 } 557 558 flags = TWL4030_BBCHEN; 559 if (uvolt >= 3200000) 560 flags |= TWL4030_BBSEL_3V2; 561 else if (uvolt >= 3100000) 562 flags |= TWL4030_BBSEL_3V1; 563 else if (uvolt >= 3000000) 564 flags |= TWL4030_BBSEL_3V0; 565 else 566 flags |= TWL4030_BBSEL_2V5; 567 568 if (uamp >= 1000) 569 flags |= TWL4030_BBISEL_1000uA; 570 else if (uamp >= 500) 571 flags |= TWL4030_BBISEL_500uA; 572 else if (uamp >= 150) 573 flags |= TWL4030_BBISEL_150uA; 574 else 575 flags |= TWL4030_BBISEL_25uA; 576 577 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 578 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, 579 flags, 580 TWL4030_BB_CFG); 581 582 return ret; 583 } 584 585 /* 586 * TWL4030 CHG_PRES (AC charger presence) events 587 */ 588 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) 589 { 590 struct twl4030_bci *bci = arg; 591 592 dev_dbg(bci->dev, "CHG_PRES irq\n"); 593 /* reset current on each 'plug' event */ 594 bci->ac_cur = 500000; 595 twl4030_charger_update_current(bci); 596 power_supply_changed(bci->ac); 597 power_supply_changed(bci->usb); 598 599 return IRQ_HANDLED; 600 } 601 602 /* 603 * TWL4030 BCI monitoring events 604 */ 605 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) 606 { 607 struct twl4030_bci *bci = arg; 608 u8 irqs1, irqs2; 609 int ret; 610 611 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, 612 TWL4030_INTERRUPTS_BCIISR1A); 613 if (ret < 0) 614 return IRQ_HANDLED; 615 616 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, 617 TWL4030_INTERRUPTS_BCIISR2A); 618 if (ret < 0) 619 return IRQ_HANDLED; 620 621 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); 622 623 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { 624 /* charger state change, inform the core */ 625 power_supply_changed(bci->ac); 626 power_supply_changed(bci->usb); 627 } 628 twl4030_charger_update_current(bci); 629 630 /* various monitoring events, for now we just log them here */ 631 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) 632 dev_warn(bci->dev, "battery temperature out of range\n"); 633 634 if (irqs1 & TWL4030_BATSTS) 635 dev_crit(bci->dev, "battery disconnected\n"); 636 637 if (irqs2 & TWL4030_VBATOV) 638 dev_crit(bci->dev, "VBAT overvoltage\n"); 639 640 if (irqs2 & TWL4030_VBUSOV) 641 dev_crit(bci->dev, "VBUS overvoltage\n"); 642 643 if (irqs2 & TWL4030_ACCHGOV) 644 dev_crit(bci->dev, "Ac charger overvoltage\n"); 645 646 return IRQ_HANDLED; 647 } 648 649 static void twl4030_bci_usb_work(struct work_struct *data) 650 { 651 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); 652 653 switch (bci->event) { 654 case USB_EVENT_VBUS: 655 case USB_EVENT_CHARGER: 656 twl4030_charger_enable_usb(bci, true); 657 break; 658 case USB_EVENT_NONE: 659 twl4030_charger_enable_usb(bci, false); 660 break; 661 } 662 } 663 664 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, 665 void *priv) 666 { 667 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); 668 669 dev_dbg(bci->dev, "OTG notify %lu\n", val); 670 671 /* reset current on each 'plug' event */ 672 if (allow_usb) 673 bci->usb_cur_target = 500000; 674 else 675 bci->usb_cur_target = 100000; 676 677 bci->event = val; 678 schedule_work(&bci->work); 679 680 return NOTIFY_OK; 681 } 682 683 /* 684 * sysfs charger enabled store 685 */ 686 static ssize_t 687 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr, 688 const char *buf, size_t n) 689 { 690 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 691 int mode; 692 int status; 693 694 mode = sysfs_match_string(modes, buf); 695 if (mode < 0) 696 return mode; 697 698 if (dev == &bci->ac->dev) { 699 if (mode == 2) 700 return -EINVAL; 701 twl4030_charger_enable_ac(bci, false); 702 bci->ac_mode = mode; 703 status = twl4030_charger_enable_ac(bci, true); 704 } else { 705 twl4030_charger_enable_usb(bci, false); 706 bci->usb_mode = mode; 707 status = twl4030_charger_enable_usb(bci, true); 708 } 709 return (status == 0) ? n : status; 710 } 711 712 /* 713 * sysfs charger enabled show 714 */ 715 static ssize_t 716 twl4030_bci_mode_show(struct device *dev, 717 struct device_attribute *attr, char *buf) 718 { 719 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 720 int len = 0; 721 int i; 722 int mode = bci->usb_mode; 723 724 if (dev == &bci->ac->dev) 725 mode = bci->ac_mode; 726 727 for (i = 0; i < ARRAY_SIZE(modes); i++) 728 if (mode == i) 729 len += snprintf(buf+len, PAGE_SIZE-len, 730 "[%s] ", modes[i]); 731 else 732 len += snprintf(buf+len, PAGE_SIZE-len, 733 "%s ", modes[i]); 734 buf[len-1] = '\n'; 735 return len; 736 } 737 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show, 738 twl4030_bci_mode_store); 739 740 static int twl4030_charger_get_current(void) 741 { 742 int curr; 743 int ret; 744 u8 bcictl1; 745 746 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); 747 if (curr < 0) 748 return curr; 749 750 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 751 if (ret) 752 return ret; 753 754 return regval2ua(curr, bcictl1 & TWL4030_CGAIN); 755 } 756 757 /* 758 * Returns the main charge FSM state 759 * Or < 0 on failure. 760 */ 761 static int twl4030bci_state(struct twl4030_bci *bci) 762 { 763 int ret; 764 u8 state; 765 766 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); 767 if (ret) { 768 dev_err(bci->dev, "error reading BCIMSTATEC\n"); 769 return ret; 770 } 771 772 dev_dbg(bci->dev, "state: %02x\n", state); 773 774 return state; 775 } 776 777 static int twl4030_bci_state_to_status(int state) 778 { 779 state &= TWL4030_MSTATEC_MASK; 780 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) 781 return POWER_SUPPLY_STATUS_CHARGING; 782 else if (TWL4030_MSTATEC_COMPLETE1 <= state && 783 state <= TWL4030_MSTATEC_COMPLETE4) 784 return POWER_SUPPLY_STATUS_FULL; 785 else 786 return POWER_SUPPLY_STATUS_NOT_CHARGING; 787 } 788 789 static int twl4030_bci_get_property(struct power_supply *psy, 790 enum power_supply_property psp, 791 union power_supply_propval *val) 792 { 793 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 794 int is_charging; 795 int state; 796 int ret; 797 798 state = twl4030bci_state(bci); 799 if (state < 0) 800 return state; 801 802 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 803 is_charging = state & TWL4030_MSTATEC_USB; 804 else 805 is_charging = state & TWL4030_MSTATEC_AC; 806 if (!is_charging) { 807 u8 s; 808 ret = twl4030_bci_read(TWL4030_BCIMDEN, &s); 809 if (ret < 0) 810 return ret; 811 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 812 is_charging = s & 1; 813 else 814 is_charging = s & 2; 815 if (is_charging) 816 /* A little white lie */ 817 state = TWL4030_MSTATEC_QUICK1; 818 } 819 820 switch (psp) { 821 case POWER_SUPPLY_PROP_STATUS: 822 if (is_charging) 823 val->intval = twl4030_bci_state_to_status(state); 824 else 825 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 826 break; 827 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 828 /* charging must be active for meaningful result */ 829 if (!is_charging) 830 return -ENODATA; 831 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) { 832 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 833 if (ret < 0) 834 return ret; 835 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 836 val->intval = ret * 6843; 837 } else { 838 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); 839 if (ret < 0) 840 return ret; 841 /* BCIVAC uses ADCIN11, 10/1023 V/step */ 842 val->intval = ret * 9775; 843 } 844 break; 845 case POWER_SUPPLY_PROP_CURRENT_NOW: 846 if (!is_charging) 847 return -ENODATA; 848 /* current measurement is shared between AC and USB */ 849 ret = twl4030_charger_get_current(); 850 if (ret < 0) 851 return ret; 852 val->intval = ret; 853 break; 854 case POWER_SUPPLY_PROP_ONLINE: 855 val->intval = is_charging && 856 twl4030_bci_state_to_status(state) != 857 POWER_SUPPLY_STATUS_NOT_CHARGING; 858 break; 859 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 860 val->intval = -1; 861 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) { 862 if (!bci->ac_is_active) 863 val->intval = bci->ac_cur; 864 } else { 865 if (bci->ac_is_active) 866 val->intval = bci->usb_cur_target; 867 } 868 if (val->intval < 0) { 869 u8 bcictl1; 870 871 val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1); 872 if (val->intval < 0) 873 return val->intval; 874 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 875 if (ret < 0) 876 return ret; 877 val->intval = regval2ua(val->intval, bcictl1 & 878 TWL4030_CGAIN); 879 } 880 break; 881 default: 882 return -EINVAL; 883 } 884 885 return 0; 886 } 887 888 static int twl4030_bci_set_property(struct power_supply *psy, 889 enum power_supply_property psp, 890 const union power_supply_propval *val) 891 { 892 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 893 894 switch (psp) { 895 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 896 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 897 bci->usb_cur_target = val->intval; 898 else 899 bci->ac_cur = val->intval; 900 twl4030_charger_update_current(bci); 901 break; 902 default: 903 return -EINVAL; 904 } 905 906 return 0; 907 } 908 909 static int twl4030_bci_property_is_writeable(struct power_supply *psy, 910 enum power_supply_property psp) 911 { 912 switch (psp) { 913 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 914 return true; 915 default: 916 return false; 917 } 918 } 919 920 static enum power_supply_property twl4030_charger_props[] = { 921 POWER_SUPPLY_PROP_STATUS, 922 POWER_SUPPLY_PROP_ONLINE, 923 POWER_SUPPLY_PROP_VOLTAGE_NOW, 924 POWER_SUPPLY_PROP_CURRENT_NOW, 925 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 926 }; 927 928 #ifdef CONFIG_OF 929 static const struct twl4030_bci_platform_data * 930 twl4030_bci_parse_dt(struct device *dev) 931 { 932 struct device_node *np = dev->of_node; 933 struct twl4030_bci_platform_data *pdata; 934 u32 num; 935 936 if (!np) 937 return NULL; 938 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 939 if (!pdata) 940 return pdata; 941 942 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0) 943 pdata->bb_uvolt = num; 944 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0) 945 pdata->bb_uamp = num; 946 return pdata; 947 } 948 #else 949 static inline const struct twl4030_bci_platform_data * 950 twl4030_bci_parse_dt(struct device *dev) 951 { 952 return NULL; 953 } 954 #endif 955 956 static const struct power_supply_desc twl4030_bci_ac_desc = { 957 .name = "twl4030_ac", 958 .type = POWER_SUPPLY_TYPE_MAINS, 959 .properties = twl4030_charger_props, 960 .num_properties = ARRAY_SIZE(twl4030_charger_props), 961 .get_property = twl4030_bci_get_property, 962 .set_property = twl4030_bci_set_property, 963 .property_is_writeable = twl4030_bci_property_is_writeable, 964 }; 965 966 static const struct power_supply_desc twl4030_bci_usb_desc = { 967 .name = "twl4030_usb", 968 .type = POWER_SUPPLY_TYPE_USB, 969 .properties = twl4030_charger_props, 970 .num_properties = ARRAY_SIZE(twl4030_charger_props), 971 .get_property = twl4030_bci_get_property, 972 .set_property = twl4030_bci_set_property, 973 .property_is_writeable = twl4030_bci_property_is_writeable, 974 }; 975 976 static int twl4030_bci_probe(struct platform_device *pdev) 977 { 978 struct twl4030_bci *bci; 979 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; 980 int ret; 981 u32 reg; 982 983 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL); 984 if (bci == NULL) 985 return -ENOMEM; 986 987 if (!pdata) 988 pdata = twl4030_bci_parse_dt(&pdev->dev); 989 990 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */ 991 bci->ichg_lo = 241000; /* Low threshold */ 992 bci->ichg_hi = 500000; /* High threshold */ 993 bci->ac_cur = 500000; /* 500mA */ 994 if (allow_usb) 995 bci->usb_cur_target = 500000; /* 500mA */ 996 else 997 bci->usb_cur_target = 100000; /* 100mA */ 998 bci->usb_mode = CHARGE_AUTO; 999 bci->ac_mode = CHARGE_AUTO; 1000 1001 bci->dev = &pdev->dev; 1002 bci->irq_chg = platform_get_irq(pdev, 0); 1003 bci->irq_bci = platform_get_irq(pdev, 1); 1004 1005 platform_set_drvdata(pdev, bci); 1006 1007 INIT_WORK(&bci->work, twl4030_bci_usb_work); 1008 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker); 1009 1010 bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac"); 1011 if (IS_ERR(bci->channel_vac)) { 1012 ret = PTR_ERR(bci->channel_vac); 1013 if (ret == -EPROBE_DEFER) 1014 return ret; /* iio not ready */ 1015 dev_warn(&pdev->dev, "could not request vac iio channel (%d)", 1016 ret); 1017 bci->channel_vac = NULL; 1018 } 1019 1020 if (bci->dev->of_node) { 1021 struct device_node *phynode; 1022 1023 phynode = of_get_compatible_child(bci->dev->of_node->parent, 1024 "ti,twl4030-usb"); 1025 if (phynode) { 1026 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; 1027 bci->transceiver = devm_usb_get_phy_by_node( 1028 bci->dev, phynode, &bci->usb_nb); 1029 of_node_put(phynode); 1030 if (IS_ERR(bci->transceiver)) { 1031 ret = PTR_ERR(bci->transceiver); 1032 if (ret == -EPROBE_DEFER) 1033 return ret; /* phy not ready */ 1034 dev_warn(&pdev->dev, "could not request transceiver (%d)", 1035 ret); 1036 bci->transceiver = NULL; 1037 } 1038 } 1039 } 1040 1041 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc, 1042 NULL); 1043 if (IS_ERR(bci->ac)) { 1044 ret = PTR_ERR(bci->ac); 1045 dev_err(&pdev->dev, "failed to register ac: %d\n", ret); 1046 return ret; 1047 } 1048 1049 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc, 1050 NULL); 1051 if (IS_ERR(bci->usb)) { 1052 ret = PTR_ERR(bci->usb); 1053 dev_err(&pdev->dev, "failed to register usb: %d\n", ret); 1054 return ret; 1055 } 1056 1057 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL, 1058 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, 1059 bci); 1060 if (ret < 0) { 1061 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1062 bci->irq_chg, ret); 1063 return ret; 1064 } 1065 1066 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL, 1067 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); 1068 if (ret < 0) { 1069 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1070 bci->irq_bci, ret); 1071 return ret; 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 return ret; 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_mode)) 1092 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1093 if (device_create_file(&bci->ac->dev, &dev_attr_mode)) 1094 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1095 1096 twl4030_charger_enable_ac(bci, true); 1097 if (!IS_ERR_OR_NULL(bci->transceiver)) 1098 twl4030_bci_usb_ncb(&bci->usb_nb, 1099 bci->transceiver->last_event, 1100 NULL); 1101 else 1102 twl4030_charger_enable_usb(bci, false); 1103 if (pdata) 1104 twl4030_charger_enable_backup(pdata->bb_uvolt, 1105 pdata->bb_uamp); 1106 else 1107 twl4030_charger_enable_backup(0, 0); 1108 1109 return 0; 1110 } 1111 1112 static int twl4030_bci_remove(struct platform_device *pdev) 1113 { 1114 struct twl4030_bci *bci = platform_get_drvdata(pdev); 1115 1116 twl4030_charger_enable_ac(bci, false); 1117 twl4030_charger_enable_usb(bci, false); 1118 twl4030_charger_enable_backup(0, 0); 1119 1120 device_remove_file(&bci->usb->dev, &dev_attr_mode); 1121 device_remove_file(&bci->ac->dev, &dev_attr_mode); 1122 /* mask interrupts */ 1123 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1124 TWL4030_INTERRUPTS_BCIIMR1A); 1125 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1126 TWL4030_INTERRUPTS_BCIIMR2A); 1127 1128 return 0; 1129 } 1130 1131 static const struct of_device_id twl_bci_of_match[] = { 1132 {.compatible = "ti,twl4030-bci", }, 1133 { } 1134 }; 1135 MODULE_DEVICE_TABLE(of, twl_bci_of_match); 1136 1137 static struct platform_driver twl4030_bci_driver = { 1138 .probe = twl4030_bci_probe, 1139 .remove = twl4030_bci_remove, 1140 .driver = { 1141 .name = "twl4030_bci", 1142 .of_match_table = of_match_ptr(twl_bci_of_match), 1143 }, 1144 }; 1145 module_platform_driver(twl4030_bci_driver); 1146 1147 MODULE_AUTHOR("Gražvydas Ignotas"); 1148 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); 1149 MODULE_LICENSE("GPL"); 1150 MODULE_ALIAS("platform:twl4030_bci"); 1151