1/* 2 * PMU driver for Wolfson Microelectronics wm831x PMICs 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11#include <linux/module.h> 12#include <linux/err.h> 13#include <linux/platform_device.h> 14#include <linux/power_supply.h> 15#include <linux/slab.h> 16 17#include <linux/mfd/wm831x/core.h> 18#include <linux/mfd/wm831x/auxadc.h> 19#include <linux/mfd/wm831x/pmu.h> 20#include <linux/mfd/wm831x/pdata.h> 21 22struct wm831x_power { 23 struct wm831x *wm831x; 24 struct power_supply wall; 25 struct power_supply usb; 26 struct power_supply battery; 27}; 28 29static int wm831x_power_check_online(struct wm831x *wm831x, int supply, 30 union power_supply_propval *val) 31{ 32 int ret; 33 34 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS); 35 if (ret < 0) 36 return ret; 37 38 if (ret & supply) 39 val->intval = 1; 40 else 41 val->intval = 0; 42 43 return 0; 44} 45 46static int wm831x_power_read_voltage(struct wm831x *wm831x, 47 enum wm831x_auxadc src, 48 union power_supply_propval *val) 49{ 50 int ret; 51 52 ret = wm831x_auxadc_read_uv(wm831x, src); 53 if (ret >= 0) 54 val->intval = ret; 55 56 return ret; 57} 58 59/********************************************************************* 60 * WALL Power 61 *********************************************************************/ 62static int wm831x_wall_get_prop(struct power_supply *psy, 63 enum power_supply_property psp, 64 union power_supply_propval *val) 65{ 66 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent); 67 struct wm831x *wm831x = wm831x_power->wm831x; 68 int ret = 0; 69 70 switch (psp) { 71 case POWER_SUPPLY_PROP_ONLINE: 72 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val); 73 break; 74 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 75 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val); 76 break; 77 default: 78 ret = -EINVAL; 79 break; 80 } 81 82 return ret; 83} 84 85static enum power_supply_property wm831x_wall_props[] = { 86 POWER_SUPPLY_PROP_ONLINE, 87 POWER_SUPPLY_PROP_VOLTAGE_NOW, 88}; 89 90/********************************************************************* 91 * USB Power 92 *********************************************************************/ 93static int wm831x_usb_get_prop(struct power_supply *psy, 94 enum power_supply_property psp, 95 union power_supply_propval *val) 96{ 97 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent); 98 struct wm831x *wm831x = wm831x_power->wm831x; 99 int ret = 0; 100 101 switch (psp) { 102 case POWER_SUPPLY_PROP_ONLINE: 103 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val); 104 break; 105 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 106 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val); 107 break; 108 default: 109 ret = -EINVAL; 110 break; 111 } 112 113 return ret; 114} 115 116static enum power_supply_property wm831x_usb_props[] = { 117 POWER_SUPPLY_PROP_ONLINE, 118 POWER_SUPPLY_PROP_VOLTAGE_NOW, 119}; 120 121/********************************************************************* 122 * Battery properties 123 *********************************************************************/ 124 125struct chg_map { 126 int val; 127 int reg_val; 128}; 129 130static struct chg_map trickle_ilims[] = { 131 { 50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT }, 132 { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT }, 133 { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT }, 134 { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT }, 135}; 136 137static struct chg_map vsels[] = { 138 { 4050, 0 << WM831X_CHG_VSEL_SHIFT }, 139 { 4100, 1 << WM831X_CHG_VSEL_SHIFT }, 140 { 4150, 2 << WM831X_CHG_VSEL_SHIFT }, 141 { 4200, 3 << WM831X_CHG_VSEL_SHIFT }, 142}; 143 144static struct chg_map fast_ilims[] = { 145 { 0, 0 << WM831X_CHG_FAST_ILIM_SHIFT }, 146 { 50, 1 << WM831X_CHG_FAST_ILIM_SHIFT }, 147 { 100, 2 << WM831X_CHG_FAST_ILIM_SHIFT }, 148 { 150, 3 << WM831X_CHG_FAST_ILIM_SHIFT }, 149 { 200, 4 << WM831X_CHG_FAST_ILIM_SHIFT }, 150 { 250, 5 << WM831X_CHG_FAST_ILIM_SHIFT }, 151 { 300, 6 << WM831X_CHG_FAST_ILIM_SHIFT }, 152 { 350, 7 << WM831X_CHG_FAST_ILIM_SHIFT }, 153 { 400, 8 << WM831X_CHG_FAST_ILIM_SHIFT }, 154 { 450, 9 << WM831X_CHG_FAST_ILIM_SHIFT }, 155 { 500, 10 << WM831X_CHG_FAST_ILIM_SHIFT }, 156 { 600, 11 << WM831X_CHG_FAST_ILIM_SHIFT }, 157 { 700, 12 << WM831X_CHG_FAST_ILIM_SHIFT }, 158 { 800, 13 << WM831X_CHG_FAST_ILIM_SHIFT }, 159 { 900, 14 << WM831X_CHG_FAST_ILIM_SHIFT }, 160 { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT }, 161}; 162 163static struct chg_map eoc_iterms[] = { 164 { 20, 0 << WM831X_CHG_ITERM_SHIFT }, 165 { 30, 1 << WM831X_CHG_ITERM_SHIFT }, 166 { 40, 2 << WM831X_CHG_ITERM_SHIFT }, 167 { 50, 3 << WM831X_CHG_ITERM_SHIFT }, 168 { 60, 4 << WM831X_CHG_ITERM_SHIFT }, 169 { 70, 5 << WM831X_CHG_ITERM_SHIFT }, 170 { 80, 6 << WM831X_CHG_ITERM_SHIFT }, 171 { 90, 7 << WM831X_CHG_ITERM_SHIFT }, 172}; 173 174static struct chg_map chg_times[] = { 175 { 60, 0 << WM831X_CHG_TIME_SHIFT }, 176 { 90, 1 << WM831X_CHG_TIME_SHIFT }, 177 { 120, 2 << WM831X_CHG_TIME_SHIFT }, 178 { 150, 3 << WM831X_CHG_TIME_SHIFT }, 179 { 180, 4 << WM831X_CHG_TIME_SHIFT }, 180 { 210, 5 << WM831X_CHG_TIME_SHIFT }, 181 { 240, 6 << WM831X_CHG_TIME_SHIFT }, 182 { 270, 7 << WM831X_CHG_TIME_SHIFT }, 183 { 300, 8 << WM831X_CHG_TIME_SHIFT }, 184 { 330, 9 << WM831X_CHG_TIME_SHIFT }, 185 { 360, 10 << WM831X_CHG_TIME_SHIFT }, 186 { 390, 11 << WM831X_CHG_TIME_SHIFT }, 187 { 420, 12 << WM831X_CHG_TIME_SHIFT }, 188 { 450, 13 << WM831X_CHG_TIME_SHIFT }, 189 { 480, 14 << WM831X_CHG_TIME_SHIFT }, 190 { 510, 15 << WM831X_CHG_TIME_SHIFT }, 191}; 192 193static void wm831x_battey_apply_config(struct wm831x *wm831x, 194 struct chg_map *map, int count, int val, 195 int *reg, const char *name, 196 const char *units) 197{ 198 int i; 199 200 for (i = 0; i < count; i++) 201 if (val == map[i].val) 202 break; 203 if (i == count) { 204 dev_err(wm831x->dev, "Invalid %s %d%s\n", 205 name, val, units); 206 } else { 207 *reg |= map[i].reg_val; 208 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units); 209 } 210} 211 212static void wm831x_config_battery(struct wm831x *wm831x) 213{ 214 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data; 215 struct wm831x_battery_pdata *pdata; 216 int ret, reg1, reg2; 217 218 if (!wm831x_pdata || !wm831x_pdata->battery) { 219 dev_warn(wm831x->dev, 220 "No battery charger configuration\n"); 221 return; 222 } 223 224 pdata = wm831x_pdata->battery; 225 226 reg1 = 0; 227 reg2 = 0; 228 229 if (!pdata->enable) { 230 dev_info(wm831x->dev, "Battery charger disabled\n"); 231 return; 232 } 233 234 reg1 |= WM831X_CHG_ENA; 235 if (pdata->off_mask) 236 reg2 |= WM831X_CHG_OFF_MSK; 237 if (pdata->fast_enable) 238 reg1 |= WM831X_CHG_FAST; 239 240 wm831x_battey_apply_config(wm831x, trickle_ilims, 241 ARRAY_SIZE(trickle_ilims), 242 pdata->trickle_ilim, ®2, 243 "trickle charge current limit", "mA"); 244 245 wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels), 246 pdata->vsel, ®2, 247 "target voltage", "mV"); 248 249 wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims), 250 pdata->fast_ilim, ®2, 251 "fast charge current limit", "mA"); 252 253 wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms), 254 pdata->eoc_iterm, ®1, 255 "end of charge current threshold", "mA"); 256 257 wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times), 258 pdata->timeout, ®2, 259 "charger timeout", "min"); 260 261 ret = wm831x_reg_unlock(wm831x); 262 if (ret != 0) { 263 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret); 264 return; 265 } 266 267 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1, 268 WM831X_CHG_ENA_MASK | 269 WM831X_CHG_FAST_MASK | 270 WM831X_CHG_ITERM_MASK | 271 WM831X_CHG_ITERM_MASK, 272 reg1); 273 if (ret != 0) 274 dev_err(wm831x->dev, "Failed to set charger control 1: %d\n", 275 ret); 276 277 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2, 278 WM831X_CHG_OFF_MSK | 279 WM831X_CHG_TIME_MASK | 280 WM831X_CHG_FAST_ILIM_MASK | 281 WM831X_CHG_TRKL_ILIM_MASK | 282 WM831X_CHG_VSEL_MASK, 283 reg2); 284 if (ret != 0) 285 dev_err(wm831x->dev, "Failed to set charger control 2: %d\n", 286 ret); 287 288 wm831x_reg_lock(wm831x); 289} 290 291static int wm831x_bat_check_status(struct wm831x *wm831x, int *status) 292{ 293 int ret; 294 295 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS); 296 if (ret < 0) 297 return ret; 298 299 if (ret & WM831X_PWR_SRC_BATT) { 300 *status = POWER_SUPPLY_STATUS_DISCHARGING; 301 return 0; 302 } 303 304 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); 305 if (ret < 0) 306 return ret; 307 308 switch (ret & WM831X_CHG_STATE_MASK) { 309 case WM831X_CHG_STATE_OFF: 310 *status = POWER_SUPPLY_STATUS_NOT_CHARGING; 311 break; 312 case WM831X_CHG_STATE_TRICKLE: 313 case WM831X_CHG_STATE_FAST: 314 *status = POWER_SUPPLY_STATUS_CHARGING; 315 break; 316 317 default: 318 *status = POWER_SUPPLY_STATUS_UNKNOWN; 319 break; 320 } 321 322 return 0; 323} 324 325static int wm831x_bat_check_type(struct wm831x *wm831x, int *type) 326{ 327 int ret; 328 329 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); 330 if (ret < 0) 331 return ret; 332 333 switch (ret & WM831X_CHG_STATE_MASK) { 334 case WM831X_CHG_STATE_TRICKLE: 335 case WM831X_CHG_STATE_TRICKLE_OT: 336 *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 337 break; 338 case WM831X_CHG_STATE_FAST: 339 case WM831X_CHG_STATE_FAST_OT: 340 *type = POWER_SUPPLY_CHARGE_TYPE_FAST; 341 break; 342 default: 343 *type = POWER_SUPPLY_CHARGE_TYPE_NONE; 344 break; 345 } 346 347 return 0; 348} 349 350static int wm831x_bat_check_health(struct wm831x *wm831x, int *health) 351{ 352 int ret; 353 354 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); 355 if (ret < 0) 356 return ret; 357 358 if (ret & WM831X_BATT_HOT_STS) { 359 *health = POWER_SUPPLY_HEALTH_OVERHEAT; 360 return 0; 361 } 362 363 if (ret & WM831X_BATT_COLD_STS) { 364 *health = POWER_SUPPLY_HEALTH_COLD; 365 return 0; 366 } 367 368 if (ret & WM831X_BATT_OV_STS) { 369 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 370 return 0; 371 } 372 373 switch (ret & WM831X_CHG_STATE_MASK) { 374 case WM831X_CHG_STATE_TRICKLE_OT: 375 case WM831X_CHG_STATE_FAST_OT: 376 *health = POWER_SUPPLY_HEALTH_OVERHEAT; 377 break; 378 case WM831X_CHG_STATE_DEFECTIVE: 379 *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 380 break; 381 default: 382 *health = POWER_SUPPLY_HEALTH_GOOD; 383 break; 384 } 385 386 return 0; 387} 388 389static int wm831x_bat_get_prop(struct power_supply *psy, 390 enum power_supply_property psp, 391 union power_supply_propval *val) 392{ 393 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent); 394 struct wm831x *wm831x = wm831x_power->wm831x; 395 int ret = 0; 396 397 switch (psp) { 398 case POWER_SUPPLY_PROP_STATUS: 399 ret = wm831x_bat_check_status(wm831x, &val->intval); 400 break; 401 case POWER_SUPPLY_PROP_ONLINE: 402 ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT, 403 val); 404 break; 405 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 406 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val); 407 break; 408 case POWER_SUPPLY_PROP_HEALTH: 409 ret = wm831x_bat_check_health(wm831x, &val->intval); 410 break; 411 case POWER_SUPPLY_PROP_CHARGE_TYPE: 412 ret = wm831x_bat_check_type(wm831x, &val->intval); 413 break; 414 default: 415 ret = -EINVAL; 416 break; 417 } 418 419 return ret; 420} 421 422static enum power_supply_property wm831x_bat_props[] = { 423 POWER_SUPPLY_PROP_STATUS, 424 POWER_SUPPLY_PROP_ONLINE, 425 POWER_SUPPLY_PROP_VOLTAGE_NOW, 426 POWER_SUPPLY_PROP_HEALTH, 427 POWER_SUPPLY_PROP_CHARGE_TYPE, 428}; 429 430static const char *wm831x_bat_irqs[] = { 431 "BATT HOT", 432 "BATT COLD", 433 "BATT FAIL", 434 "OV", 435 "END", 436 "TO", 437 "MODE", 438 "START", 439}; 440 441static irqreturn_t wm831x_bat_irq(int irq, void *data) 442{ 443 struct wm831x_power *wm831x_power = data; 444 struct wm831x *wm831x = wm831x_power->wm831x; 445 446 dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq); 447 448 /* The battery charger is autonomous so we don't need to do 449 * anything except kick user space */ 450 power_supply_changed(&wm831x_power->battery); 451 452 return IRQ_HANDLED; 453} 454 455 456/********************************************************************* 457 * Initialisation 458 *********************************************************************/ 459 460static irqreturn_t wm831x_syslo_irq(int irq, void *data) 461{ 462 struct wm831x_power *wm831x_power = data; 463 struct wm831x *wm831x = wm831x_power->wm831x; 464 465 /* Not much we can actually *do* but tell people for 466 * posterity, we're probably about to run out of power. */ 467 dev_crit(wm831x->dev, "SYSVDD under voltage\n"); 468 469 return IRQ_HANDLED; 470} 471 472static irqreturn_t wm831x_pwr_src_irq(int irq, void *data) 473{ 474 struct wm831x_power *wm831x_power = data; 475 struct wm831x *wm831x = wm831x_power->wm831x; 476 477 dev_dbg(wm831x->dev, "Power source changed\n"); 478 479 /* Just notify for everything - little harm in overnotifying. */ 480 power_supply_changed(&wm831x_power->battery); 481 power_supply_changed(&wm831x_power->usb); 482 power_supply_changed(&wm831x_power->wall); 483 484 return IRQ_HANDLED; 485} 486 487static __devinit int wm831x_power_probe(struct platform_device *pdev) 488{ 489 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 490 struct wm831x_power *power; 491 struct power_supply *usb; 492 struct power_supply *battery; 493 struct power_supply *wall; 494 int ret, irq, i; 495 496 power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL); 497 if (power == NULL) 498 return -ENOMEM; 499 500 power->wm831x = wm831x; 501 platform_set_drvdata(pdev, power); 502 503 usb = &power->usb; 504 battery = &power->battery; 505 wall = &power->wall; 506 507 /* We ignore configuration failures since we can still read back 508 * the status without enabling the charger. 509 */ 510 wm831x_config_battery(wm831x); 511 512 wall->name = "wm831x-wall"; 513 wall->type = POWER_SUPPLY_TYPE_MAINS; 514 wall->properties = wm831x_wall_props; 515 wall->num_properties = ARRAY_SIZE(wm831x_wall_props); 516 wall->get_property = wm831x_wall_get_prop; 517 ret = power_supply_register(&pdev->dev, wall); 518 if (ret) 519 goto err_kmalloc; 520 521 battery->name = "wm831x-battery"; 522 battery->properties = wm831x_bat_props; 523 battery->num_properties = ARRAY_SIZE(wm831x_bat_props); 524 battery->get_property = wm831x_bat_get_prop; 525 battery->use_for_apm = 1; 526 ret = power_supply_register(&pdev->dev, battery); 527 if (ret) 528 goto err_wall; 529 530 usb->name = "wm831x-usb", 531 usb->type = POWER_SUPPLY_TYPE_USB; 532 usb->properties = wm831x_usb_props; 533 usb->num_properties = ARRAY_SIZE(wm831x_usb_props); 534 usb->get_property = wm831x_usb_get_prop; 535 ret = power_supply_register(&pdev->dev, usb); 536 if (ret) 537 goto err_battery; 538 539 irq = platform_get_irq_byname(pdev, "SYSLO"); 540 ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq, 541 IRQF_TRIGGER_RISING, "System power low", 542 power); 543 if (ret != 0) { 544 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n", 545 irq, ret); 546 goto err_usb; 547 } 548 549 irq = platform_get_irq_byname(pdev, "PWR SRC"); 550 ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq, 551 IRQF_TRIGGER_RISING, "Power source", 552 power); 553 if (ret != 0) { 554 dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n", 555 irq, ret); 556 goto err_syslo; 557 } 558 559 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) { 560 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]); 561 ret = request_threaded_irq(irq, NULL, wm831x_bat_irq, 562 IRQF_TRIGGER_RISING, 563 wm831x_bat_irqs[i], 564 power); 565 if (ret != 0) { 566 dev_err(&pdev->dev, 567 "Failed to request %s IRQ %d: %d\n", 568 wm831x_bat_irqs[i], irq, ret); 569 goto err_bat_irq; 570 } 571 } 572 573 return ret; 574 575err_bat_irq: 576 for (; i >= 0; i--) { 577 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]); 578 free_irq(irq, power); 579 } 580 irq = platform_get_irq_byname(pdev, "PWR SRC"); 581 free_irq(irq, power); 582err_syslo: 583 irq = platform_get_irq_byname(pdev, "SYSLO"); 584 free_irq(irq, power); 585err_usb: 586 power_supply_unregister(usb); 587err_battery: 588 power_supply_unregister(battery); 589err_wall: 590 power_supply_unregister(wall); 591err_kmalloc: 592 kfree(power); 593 return ret; 594} 595 596static __devexit int wm831x_power_remove(struct platform_device *pdev) 597{ 598 struct wm831x_power *wm831x_power = platform_get_drvdata(pdev); 599 int irq, i; 600 601 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) { 602 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]); 603 free_irq(irq, wm831x_power); 604 } 605 606 irq = platform_get_irq_byname(pdev, "PWR SRC"); 607 free_irq(irq, wm831x_power); 608 609 irq = platform_get_irq_byname(pdev, "SYSLO"); 610 free_irq(irq, wm831x_power); 611 612 power_supply_unregister(&wm831x_power->battery); 613 power_supply_unregister(&wm831x_power->wall); 614 power_supply_unregister(&wm831x_power->usb); 615 return 0; 616} 617 618static struct platform_driver wm831x_power_driver = { 619 .probe = wm831x_power_probe, 620 .remove = __devexit_p(wm831x_power_remove), 621 .driver = { 622 .name = "wm831x-power", 623 }, 624}; 625 626static int __init wm831x_power_init(void) 627{ 628 return platform_driver_register(&wm831x_power_driver); 629} 630module_init(wm831x_power_init); 631 632static void __exit wm831x_power_exit(void) 633{ 634 platform_driver_unregister(&wm831x_power_driver); 635} 636module_exit(wm831x_power_exit); 637 638MODULE_DESCRIPTION("Power supply driver for WM831x PMICs"); 639MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 640MODULE_LICENSE("GPL"); 641MODULE_ALIAS("platform:wm831x-power"); 642