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 bci->usb_cur -= USB_CUR_STEP; 424 bci->usb_cur_target = bci->usb_cur; 425 } else if (bci->usb_cur >= bci->usb_cur_target || 426 bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) { 427 /* Reached target and voltage is OK - stop */ 428 return; 429 } else { 430 bci->usb_cur += USB_CUR_STEP; 431 schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY); 432 } 433 twl4030_charger_update_current(bci); 434 } 435 436 /* 437 * Enable/Disable USB Charge functionality. 438 */ 439 static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable) 440 { 441 int ret; 442 443 if (bci->usb_mode == CHARGE_OFF) 444 enable = false; 445 if (enable && !IS_ERR_OR_NULL(bci->transceiver)) { 446 447 twl4030_charger_update_current(bci); 448 449 /* Need to keep phy powered */ 450 if (!bci->usb_enabled) { 451 pm_runtime_get_sync(bci->transceiver->dev); 452 bci->usb_enabled = 1; 453 } 454 455 if (bci->usb_mode == CHARGE_AUTO) 456 /* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */ 457 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB); 458 459 /* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */ 460 ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0, 461 TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4); 462 if (bci->usb_mode == CHARGE_LINEAR) { 463 twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0); 464 /* Watch dog key: WOVF acknowledge */ 465 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33, 466 TWL4030_BCIWDKEY); 467 /* 0x24 + EKEY6: off mode */ 468 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 469 TWL4030_BCIMDKEY); 470 /* EKEY2: Linear charge: USB path */ 471 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26, 472 TWL4030_BCIMDKEY); 473 /* WDKEY5: stop watchdog count */ 474 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3, 475 TWL4030_BCIWDKEY); 476 /* enable MFEN3 access */ 477 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c, 478 TWL4030_BCIMFKEY); 479 /* ICHGEOCEN - end-of-charge monitor (current < 80mA) 480 * (charging continues) 481 * ICHGLOWEN - current level monitor (charge continues) 482 * don't monitor over-current or heat save 483 */ 484 ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0, 485 TWL4030_BCIMFEN3); 486 } 487 } else { 488 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0); 489 ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a, 490 TWL4030_BCIMDKEY); 491 if (bci->usb_enabled) { 492 pm_runtime_mark_last_busy(bci->transceiver->dev); 493 pm_runtime_put_autosuspend(bci->transceiver->dev); 494 bci->usb_enabled = 0; 495 } 496 bci->usb_cur = 0; 497 } 498 499 return ret; 500 } 501 502 /* 503 * Enable/Disable AC Charge funtionality. 504 */ 505 static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable) 506 { 507 int ret; 508 509 if (bci->ac_mode == CHARGE_OFF) 510 enable = false; 511 512 if (enable) 513 ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC); 514 else 515 ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0); 516 517 return ret; 518 } 519 520 /* 521 * Enable/Disable charging of Backup Battery. 522 */ 523 static int twl4030_charger_enable_backup(int uvolt, int uamp) 524 { 525 int ret; 526 u8 flags; 527 528 if (uvolt < 2500000 || 529 uamp < 25) { 530 /* disable charging of backup battery */ 531 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 532 TWL4030_BBCHEN, 0, TWL4030_BB_CFG); 533 return ret; 534 } 535 536 flags = TWL4030_BBCHEN; 537 if (uvolt >= 3200000) 538 flags |= TWL4030_BBSEL_3V2; 539 else if (uvolt >= 3100000) 540 flags |= TWL4030_BBSEL_3V1; 541 else if (uvolt >= 3000000) 542 flags |= TWL4030_BBSEL_3V0; 543 else 544 flags |= TWL4030_BBSEL_2V5; 545 546 if (uamp >= 1000) 547 flags |= TWL4030_BBISEL_1000uA; 548 else if (uamp >= 500) 549 flags |= TWL4030_BBISEL_500uA; 550 else if (uamp >= 150) 551 flags |= TWL4030_BBISEL_150uA; 552 else 553 flags |= TWL4030_BBISEL_25uA; 554 555 ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER, 556 TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK, 557 flags, 558 TWL4030_BB_CFG); 559 560 return ret; 561 } 562 563 /* 564 * TWL4030 CHG_PRES (AC charger presence) events 565 */ 566 static irqreturn_t twl4030_charger_interrupt(int irq, void *arg) 567 { 568 struct twl4030_bci *bci = arg; 569 570 dev_dbg(bci->dev, "CHG_PRES irq\n"); 571 /* reset current on each 'plug' event */ 572 bci->ac_cur = 500000; 573 twl4030_charger_update_current(bci); 574 power_supply_changed(bci->ac); 575 power_supply_changed(bci->usb); 576 577 return IRQ_HANDLED; 578 } 579 580 /* 581 * TWL4030 BCI monitoring events 582 */ 583 static irqreturn_t twl4030_bci_interrupt(int irq, void *arg) 584 { 585 struct twl4030_bci *bci = arg; 586 u8 irqs1, irqs2; 587 int ret; 588 589 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1, 590 TWL4030_INTERRUPTS_BCIISR1A); 591 if (ret < 0) 592 return IRQ_HANDLED; 593 594 ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2, 595 TWL4030_INTERRUPTS_BCIISR2A); 596 if (ret < 0) 597 return IRQ_HANDLED; 598 599 dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1); 600 601 if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) { 602 /* charger state change, inform the core */ 603 power_supply_changed(bci->ac); 604 power_supply_changed(bci->usb); 605 } 606 twl4030_charger_update_current(bci); 607 608 /* various monitoring events, for now we just log them here */ 609 if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1)) 610 dev_warn(bci->dev, "battery temperature out of range\n"); 611 612 if (irqs1 & TWL4030_BATSTS) 613 dev_crit(bci->dev, "battery disconnected\n"); 614 615 if (irqs2 & TWL4030_VBATOV) 616 dev_crit(bci->dev, "VBAT overvoltage\n"); 617 618 if (irqs2 & TWL4030_VBUSOV) 619 dev_crit(bci->dev, "VBUS overvoltage\n"); 620 621 if (irqs2 & TWL4030_ACCHGOV) 622 dev_crit(bci->dev, "Ac charger overvoltage\n"); 623 624 return IRQ_HANDLED; 625 } 626 627 static void twl4030_bci_usb_work(struct work_struct *data) 628 { 629 struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work); 630 631 switch (bci->event) { 632 case USB_EVENT_VBUS: 633 case USB_EVENT_CHARGER: 634 twl4030_charger_enable_usb(bci, true); 635 break; 636 case USB_EVENT_NONE: 637 twl4030_charger_enable_usb(bci, false); 638 break; 639 } 640 } 641 642 static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val, 643 void *priv) 644 { 645 struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb); 646 647 dev_dbg(bci->dev, "OTG notify %lu\n", val); 648 649 /* reset current on each 'plug' event */ 650 if (allow_usb) 651 bci->usb_cur_target = 500000; 652 else 653 bci->usb_cur_target = 100000; 654 655 bci->event = val; 656 schedule_work(&bci->work); 657 658 return NOTIFY_OK; 659 } 660 661 /* 662 * sysfs charger enabled store 663 */ 664 static ssize_t 665 twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr, 666 const char *buf, size_t n) 667 { 668 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 669 int mode; 670 int status; 671 672 mode = sysfs_match_string(modes, buf); 673 if (mode < 0) 674 return mode; 675 676 if (dev == &bci->ac->dev) { 677 if (mode == 2) 678 return -EINVAL; 679 twl4030_charger_enable_ac(bci, false); 680 bci->ac_mode = mode; 681 status = twl4030_charger_enable_ac(bci, true); 682 } else { 683 twl4030_charger_enable_usb(bci, false); 684 bci->usb_mode = mode; 685 status = twl4030_charger_enable_usb(bci, true); 686 } 687 return (status == 0) ? n : status; 688 } 689 690 /* 691 * sysfs charger enabled show 692 */ 693 static ssize_t 694 twl4030_bci_mode_show(struct device *dev, 695 struct device_attribute *attr, char *buf) 696 { 697 struct twl4030_bci *bci = dev_get_drvdata(dev->parent); 698 int len = 0; 699 int i; 700 int mode = bci->usb_mode; 701 702 if (dev == &bci->ac->dev) 703 mode = bci->ac_mode; 704 705 for (i = 0; i < ARRAY_SIZE(modes); i++) 706 if (mode == i) 707 len += snprintf(buf+len, PAGE_SIZE-len, 708 "[%s] ", modes[i]); 709 else 710 len += snprintf(buf+len, PAGE_SIZE-len, 711 "%s ", modes[i]); 712 buf[len-1] = '\n'; 713 return len; 714 } 715 static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show, 716 twl4030_bci_mode_store); 717 718 static int twl4030_charger_get_current(void) 719 { 720 int curr; 721 int ret; 722 u8 bcictl1; 723 724 curr = twl4030bci_read_adc_val(TWL4030_BCIICHG); 725 if (curr < 0) 726 return curr; 727 728 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 729 if (ret) 730 return ret; 731 732 return regval2ua(curr, bcictl1 & TWL4030_CGAIN); 733 } 734 735 /* 736 * Returns the main charge FSM state 737 * Or < 0 on failure. 738 */ 739 static int twl4030bci_state(struct twl4030_bci *bci) 740 { 741 int ret; 742 u8 state; 743 744 ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state); 745 if (ret) { 746 dev_err(bci->dev, "error reading BCIMSTATEC\n"); 747 return ret; 748 } 749 750 dev_dbg(bci->dev, "state: %02x\n", state); 751 752 return state; 753 } 754 755 static int twl4030_bci_state_to_status(int state) 756 { 757 state &= TWL4030_MSTATEC_MASK; 758 if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7) 759 return POWER_SUPPLY_STATUS_CHARGING; 760 else if (TWL4030_MSTATEC_COMPLETE1 <= state && 761 state <= TWL4030_MSTATEC_COMPLETE4) 762 return POWER_SUPPLY_STATUS_FULL; 763 else 764 return POWER_SUPPLY_STATUS_NOT_CHARGING; 765 } 766 767 static int twl4030_bci_get_property(struct power_supply *psy, 768 enum power_supply_property psp, 769 union power_supply_propval *val) 770 { 771 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 772 int is_charging; 773 int state; 774 int ret; 775 776 state = twl4030bci_state(bci); 777 if (state < 0) 778 return state; 779 780 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 781 is_charging = state & TWL4030_MSTATEC_USB; 782 else 783 is_charging = state & TWL4030_MSTATEC_AC; 784 if (!is_charging) { 785 u8 s; 786 twl4030_bci_read(TWL4030_BCIMDEN, &s); 787 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 788 is_charging = s & 1; 789 else 790 is_charging = s & 2; 791 if (is_charging) 792 /* A little white lie */ 793 state = TWL4030_MSTATEC_QUICK1; 794 } 795 796 switch (psp) { 797 case POWER_SUPPLY_PROP_STATUS: 798 if (is_charging) 799 val->intval = twl4030_bci_state_to_status(state); 800 else 801 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 802 break; 803 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 804 /* charging must be active for meaningful result */ 805 if (!is_charging) 806 return -ENODATA; 807 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) { 808 ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS); 809 if (ret < 0) 810 return ret; 811 /* BCIVBUS uses ADCIN8, 7/1023 V/step */ 812 val->intval = ret * 6843; 813 } else { 814 ret = twl4030bci_read_adc_val(TWL4030_BCIVAC); 815 if (ret < 0) 816 return ret; 817 /* BCIVAC uses ADCIN11, 10/1023 V/step */ 818 val->intval = ret * 9775; 819 } 820 break; 821 case POWER_SUPPLY_PROP_CURRENT_NOW: 822 if (!is_charging) 823 return -ENODATA; 824 /* current measurement is shared between AC and USB */ 825 ret = twl4030_charger_get_current(); 826 if (ret < 0) 827 return ret; 828 val->intval = ret; 829 break; 830 case POWER_SUPPLY_PROP_ONLINE: 831 val->intval = is_charging && 832 twl4030_bci_state_to_status(state) != 833 POWER_SUPPLY_STATUS_NOT_CHARGING; 834 break; 835 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 836 val->intval = -1; 837 if (psy->desc->type != POWER_SUPPLY_TYPE_USB) { 838 if (!bci->ac_is_active) 839 val->intval = bci->ac_cur; 840 } else { 841 if (bci->ac_is_active) 842 val->intval = bci->usb_cur_target; 843 } 844 if (val->intval < 0) { 845 u8 bcictl1; 846 847 val->intval = twl4030bci_read_adc_val(TWL4030_BCIIREF1); 848 if (val->intval < 0) 849 return val->intval; 850 ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1); 851 if (ret < 0) 852 return ret; 853 val->intval = regval2ua(val->intval, bcictl1 & 854 TWL4030_CGAIN); 855 } 856 break; 857 default: 858 return -EINVAL; 859 } 860 861 return 0; 862 } 863 864 static int twl4030_bci_set_property(struct power_supply *psy, 865 enum power_supply_property psp, 866 const union power_supply_propval *val) 867 { 868 struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent); 869 870 switch (psp) { 871 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 872 if (psy->desc->type == POWER_SUPPLY_TYPE_USB) 873 bci->usb_cur_target = val->intval; 874 else 875 bci->ac_cur = val->intval; 876 twl4030_charger_update_current(bci); 877 break; 878 default: 879 return -EINVAL; 880 } 881 882 return 0; 883 } 884 885 static int twl4030_bci_property_is_writeable(struct power_supply *psy, 886 enum power_supply_property psp) 887 { 888 switch (psp) { 889 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 890 return true; 891 default: 892 return false; 893 } 894 } 895 896 static enum power_supply_property twl4030_charger_props[] = { 897 POWER_SUPPLY_PROP_STATUS, 898 POWER_SUPPLY_PROP_ONLINE, 899 POWER_SUPPLY_PROP_VOLTAGE_NOW, 900 POWER_SUPPLY_PROP_CURRENT_NOW, 901 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 902 }; 903 904 #ifdef CONFIG_OF 905 static const struct twl4030_bci_platform_data * 906 twl4030_bci_parse_dt(struct device *dev) 907 { 908 struct device_node *np = dev->of_node; 909 struct twl4030_bci_platform_data *pdata; 910 u32 num; 911 912 if (!np) 913 return NULL; 914 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 915 if (!pdata) 916 return pdata; 917 918 if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0) 919 pdata->bb_uvolt = num; 920 if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0) 921 pdata->bb_uamp = num; 922 return pdata; 923 } 924 #else 925 static inline const struct twl4030_bci_platform_data * 926 twl4030_bci_parse_dt(struct device *dev) 927 { 928 return NULL; 929 } 930 #endif 931 932 static const struct power_supply_desc twl4030_bci_ac_desc = { 933 .name = "twl4030_ac", 934 .type = POWER_SUPPLY_TYPE_MAINS, 935 .properties = twl4030_charger_props, 936 .num_properties = ARRAY_SIZE(twl4030_charger_props), 937 .get_property = twl4030_bci_get_property, 938 .set_property = twl4030_bci_set_property, 939 .property_is_writeable = twl4030_bci_property_is_writeable, 940 }; 941 942 static const struct power_supply_desc twl4030_bci_usb_desc = { 943 .name = "twl4030_usb", 944 .type = POWER_SUPPLY_TYPE_USB, 945 .properties = twl4030_charger_props, 946 .num_properties = ARRAY_SIZE(twl4030_charger_props), 947 .get_property = twl4030_bci_get_property, 948 .set_property = twl4030_bci_set_property, 949 .property_is_writeable = twl4030_bci_property_is_writeable, 950 }; 951 952 static int twl4030_bci_probe(struct platform_device *pdev) 953 { 954 struct twl4030_bci *bci; 955 const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data; 956 int ret; 957 u32 reg; 958 959 bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL); 960 if (bci == NULL) 961 return -ENOMEM; 962 963 if (!pdata) 964 pdata = twl4030_bci_parse_dt(&pdev->dev); 965 966 bci->ichg_eoc = 80100; /* Stop charging when current drops to here */ 967 bci->ichg_lo = 241000; /* Low threshold */ 968 bci->ichg_hi = 500000; /* High threshold */ 969 bci->ac_cur = 500000; /* 500mA */ 970 if (allow_usb) 971 bci->usb_cur_target = 500000; /* 500mA */ 972 else 973 bci->usb_cur_target = 100000; /* 100mA */ 974 bci->usb_mode = CHARGE_AUTO; 975 bci->ac_mode = CHARGE_AUTO; 976 977 bci->dev = &pdev->dev; 978 bci->irq_chg = platform_get_irq(pdev, 0); 979 bci->irq_bci = platform_get_irq(pdev, 1); 980 981 platform_set_drvdata(pdev, bci); 982 983 INIT_WORK(&bci->work, twl4030_bci_usb_work); 984 INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker); 985 986 bci->channel_vac = devm_iio_channel_get(&pdev->dev, "vac"); 987 if (IS_ERR(bci->channel_vac)) { 988 ret = PTR_ERR(bci->channel_vac); 989 if (ret == -EPROBE_DEFER) 990 return ret; /* iio not ready */ 991 dev_warn(&pdev->dev, "could not request vac iio channel (%d)", 992 ret); 993 bci->channel_vac = NULL; 994 } 995 996 if (bci->dev->of_node) { 997 struct device_node *phynode; 998 999 phynode = of_find_compatible_node(bci->dev->of_node->parent, 1000 NULL, "ti,twl4030-usb"); 1001 if (phynode) { 1002 bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; 1003 bci->transceiver = devm_usb_get_phy_by_node( 1004 bci->dev, phynode, &bci->usb_nb); 1005 if (IS_ERR(bci->transceiver)) { 1006 ret = PTR_ERR(bci->transceiver); 1007 if (ret == -EPROBE_DEFER) 1008 return ret; /* phy not ready */ 1009 dev_warn(&pdev->dev, "could not request transceiver (%d)", 1010 ret); 1011 bci->transceiver = NULL; 1012 } 1013 } 1014 } 1015 1016 bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc, 1017 NULL); 1018 if (IS_ERR(bci->ac)) { 1019 ret = PTR_ERR(bci->ac); 1020 dev_err(&pdev->dev, "failed to register ac: %d\n", ret); 1021 return ret; 1022 } 1023 1024 bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc, 1025 NULL); 1026 if (IS_ERR(bci->usb)) { 1027 ret = PTR_ERR(bci->usb); 1028 dev_err(&pdev->dev, "failed to register usb: %d\n", ret); 1029 return ret; 1030 } 1031 1032 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL, 1033 twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name, 1034 bci); 1035 if (ret < 0) { 1036 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1037 bci->irq_chg, ret); 1038 return ret; 1039 } 1040 1041 ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL, 1042 twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci); 1043 if (ret < 0) { 1044 dev_err(&pdev->dev, "could not request irq %d, status %d\n", 1045 bci->irq_bci, ret); 1046 return ret; 1047 } 1048 1049 /* Enable interrupts now. */ 1050 reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 | 1051 TWL4030_TBATOR1 | TWL4030_BATSTS); 1052 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 1053 TWL4030_INTERRUPTS_BCIIMR1A); 1054 if (ret < 0) { 1055 dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 1056 return ret; 1057 } 1058 1059 reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV); 1060 ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg, 1061 TWL4030_INTERRUPTS_BCIIMR2A); 1062 if (ret < 0) 1063 dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret); 1064 1065 twl4030_charger_update_current(bci); 1066 if (device_create_file(&bci->usb->dev, &dev_attr_mode)) 1067 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1068 if (device_create_file(&bci->ac->dev, &dev_attr_mode)) 1069 dev_warn(&pdev->dev, "could not create sysfs file\n"); 1070 1071 twl4030_charger_enable_ac(bci, true); 1072 if (!IS_ERR_OR_NULL(bci->transceiver)) 1073 twl4030_bci_usb_ncb(&bci->usb_nb, 1074 bci->transceiver->last_event, 1075 NULL); 1076 else 1077 twl4030_charger_enable_usb(bci, false); 1078 if (pdata) 1079 twl4030_charger_enable_backup(pdata->bb_uvolt, 1080 pdata->bb_uamp); 1081 else 1082 twl4030_charger_enable_backup(0, 0); 1083 1084 return 0; 1085 } 1086 1087 static int twl4030_bci_remove(struct platform_device *pdev) 1088 { 1089 struct twl4030_bci *bci = platform_get_drvdata(pdev); 1090 1091 twl4030_charger_enable_ac(bci, false); 1092 twl4030_charger_enable_usb(bci, false); 1093 twl4030_charger_enable_backup(0, 0); 1094 1095 device_remove_file(&bci->usb->dev, &dev_attr_mode); 1096 device_remove_file(&bci->ac->dev, &dev_attr_mode); 1097 /* mask interrupts */ 1098 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1099 TWL4030_INTERRUPTS_BCIIMR1A); 1100 twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff, 1101 TWL4030_INTERRUPTS_BCIIMR2A); 1102 1103 return 0; 1104 } 1105 1106 static const struct of_device_id twl_bci_of_match[] = { 1107 {.compatible = "ti,twl4030-bci", }, 1108 { } 1109 }; 1110 MODULE_DEVICE_TABLE(of, twl_bci_of_match); 1111 1112 static struct platform_driver twl4030_bci_driver = { 1113 .probe = twl4030_bci_probe, 1114 .remove = twl4030_bci_remove, 1115 .driver = { 1116 .name = "twl4030_bci", 1117 .of_match_table = of_match_ptr(twl_bci_of_match), 1118 }, 1119 }; 1120 module_platform_driver(twl4030_bci_driver); 1121 1122 MODULE_AUTHOR("Gražvydas Ignotas"); 1123 MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver"); 1124 MODULE_LICENSE("GPL"); 1125 MODULE_ALIAS("platform:twl4030_bci"); 1126