FILE
wm831x_power.c
File preview with syntax highlighting.
linux-6.19.14/drivers/power/supply/wm831x_power.c
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * PMU driver for Wolfson Microelectronics wm831x PMICs 4 * 5 * Copyright 2009 Wolfson Microelectronics PLC. 6 */ 7 8#include <linux/module.h> 9#include <linux/err.h> 10#include <linux/platform_device.h> 11#include <linux/power_supply.h> 12#include <linux/slab.h> 13#include <linux/usb/phy.h> 14 15#include <linux/mfd/wm831x/core.h> 16#include <linux/mfd/wm831x/auxadc.h> 17#include <linux/mfd/wm831x/pmu.h> 18#include <linux/mfd/wm831x/pdata.h> 19 20struct wm831x_power { 21 struct wm831x *wm831x; 22 struct power_supply *wall; 23 struct power_supply *usb; 24 struct power_supply *battery; 25 struct power_supply_desc wall_desc; 26 struct power_supply_desc usb_desc; 27 struct power_supply_desc battery_desc; 28 char wall_name[20]; 29 char usb_name[20]; 30 char battery_name[20]; 31 bool have_battery; 32 struct usb_phy *usb_phy; 33 struct notifier_block usb_notify; 34}; 35 36static int wm831x_power_check_online(struct wm831x *wm831x, int supply, 37 union power_supply_propval *val) 38{ 39 int ret; 40 41 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS); 42 if (ret < 0) 43 return ret; 44 45 if (ret & supply) 46 val->intval = 1; 47 else 48 val->intval = 0; 49 50 return 0; 51} 52 53static int wm831x_power_read_voltage(struct wm831x *wm831x, 54 enum wm831x_auxadc src, 55 union power_supply_propval *val) 56{ 57 int ret; 58 59 ret = wm831x_auxadc_read_uv(wm831x, src); 60 if (ret >= 0) 61 val->intval = ret; 62 63 return ret; 64} 65 66/********************************************************************* 67 * WALL Power 68 *********************************************************************/ 69static int wm831x_wall_get_prop(struct power_supply *psy, 70 enum power_supply_property psp, 71 union power_supply_propval *val) 72{ 73 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent); 74 struct wm831x *wm831x = wm831x_power->wm831x; 75 int ret = 0; 76 77 switch (psp) { 78 case POWER_SUPPLY_PROP_ONLINE: 79 ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val); 80 break; 81 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 82 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val); 83 break; 84 default: 85 ret = -EINVAL; 86 break; 87 } 88 89 return ret; 90} 91 92static const enum power_supply_property wm831x_wall_props[] = { 93 POWER_SUPPLY_PROP_ONLINE, 94 POWER_SUPPLY_PROP_VOLTAGE_NOW, 95}; 96 97/********************************************************************* 98 * USB Power 99 *********************************************************************/ 100static int wm831x_usb_get_prop(struct power_supply *psy, 101 enum power_supply_property psp, 102 union power_supply_propval *val) 103{ 104 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent); 105 struct wm831x *wm831x = wm831x_power->wm831x; 106 int ret = 0; 107 108 switch (psp) { 109 case POWER_SUPPLY_PROP_ONLINE: 110 ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val); 111 break; 112 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 113 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val); 114 break; 115 default: 116 ret = -EINVAL; 117 break; 118 } 119 120 return ret; 121} 122 123static const enum power_supply_property wm831x_usb_props[] = { 124 POWER_SUPPLY_PROP_ONLINE, 125 POWER_SUPPLY_PROP_VOLTAGE_NOW, 126}; 127 128/* In milliamps */ 129static const unsigned int wm831x_usb_limits[] = { 130 0, 131 2, 132 100, 133 500, 134 900, 135 1500, 136 1800, 137 550, 138}; 139 140static int wm831x_usb_limit_change(struct notifier_block *nb, 141 unsigned long limit, void *data) 142{ 143 struct wm831x_power *wm831x_power = container_of(nb, 144 struct wm831x_power, 145 usb_notify); 146 unsigned int i, best; 147 int ret; 148 149 /* Find the highest supported limit */ 150 best = 0; 151 for (i = 0; i < ARRAY_SIZE(wm831x_usb_limits); i++) { 152 if (limit >= wm831x_usb_limits[i] && 153 wm831x_usb_limits[best] < wm831x_usb_limits[i]) 154 best = i; 155 } 156 157 dev_dbg(wm831x_power->wm831x->dev, 158 "Limiting USB current to %umA", wm831x_usb_limits[best]); 159 160 ret = wm831x_set_bits(wm831x_power->wm831x, WM831X_POWER_STATE, 161 WM831X_USB_ILIM_MASK, best); 162 if (ret < 0) { 163 dev_err(wm831x_power->wm831x->dev, 164 "Failed to set USB current limit: %d\n", ret); 165 return ret; 166 } 167 168 return 0; 169} 170 171/********************************************************************* 172 * Battery properties 173 *********************************************************************/ 174 175struct chg_map { 176 int val; 177 int reg_val; 178}; 179 180static const struct chg_map trickle_ilims[] = { 181 { 50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT }, 182 { 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT }, 183 { 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT }, 184 { 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT }, 185}; 186 187static const struct chg_map vsels[] = { 188 { 4050, 0 << WM831X_CHG_VSEL_SHIFT }, 189 { 4100, 1 << WM831X_CHG_VSEL_SHIFT }, 190 { 4150, 2 << WM831X_CHG_VSEL_SHIFT }, 191 { 4200, 3 << WM831X_CHG_VSEL_SHIFT }, 192}; 193 194static const struct chg_map fast_ilims[] = { 195 { 0, 0 << WM831X_CHG_FAST_ILIM_SHIFT }, 196 { 50, 1 << WM831X_CHG_FAST_ILIM_SHIFT }, 197 { 100, 2 << WM831X_CHG_FAST_ILIM_SHIFT }, 198 { 150, 3 << WM831X_CHG_FAST_ILIM_SHIFT }, 199 { 200, 4 << WM831X_CHG_FAST_ILIM_SHIFT }, 200 { 250, 5 << WM831X_CHG_FAST_ILIM_SHIFT }, 201 { 300, 6 << WM831X_CHG_FAST_ILIM_SHIFT }, 202 { 350, 7 << WM831X_CHG_FAST_ILIM_SHIFT }, 203 { 400, 8 << WM831X_CHG_FAST_ILIM_SHIFT }, 204 { 450, 9 << WM831X_CHG_FAST_ILIM_SHIFT }, 205 { 500, 10 << WM831X_CHG_FAST_ILIM_SHIFT }, 206 { 600, 11 << WM831X_CHG_FAST_ILIM_SHIFT }, 207 { 700, 12 << WM831X_CHG_FAST_ILIM_SHIFT }, 208 { 800, 13 << WM831X_CHG_FAST_ILIM_SHIFT }, 209 { 900, 14 << WM831X_CHG_FAST_ILIM_SHIFT }, 210 { 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT }, 211}; 212 213static const struct chg_map eoc_iterms[] = { 214 { 20, 0 << WM831X_CHG_ITERM_SHIFT }, 215 { 30, 1 << WM831X_CHG_ITERM_SHIFT }, 216 { 40, 2 << WM831X_CHG_ITERM_SHIFT }, 217 { 50, 3 << WM831X_CHG_ITERM_SHIFT }, 218 { 60, 4 << WM831X_CHG_ITERM_SHIFT }, 219 { 70, 5 << WM831X_CHG_ITERM_SHIFT }, 220 { 80, 6 << WM831X_CHG_ITERM_SHIFT }, 221 { 90, 7 << WM831X_CHG_ITERM_SHIFT }, 222}; 223 224static const struct chg_map chg_times[] = { 225 { 60, 0 << WM831X_CHG_TIME_SHIFT }, 226 { 90, 1 << WM831X_CHG_TIME_SHIFT }, 227 { 120, 2 << WM831X_CHG_TIME_SHIFT }, 228 { 150, 3 << WM831X_CHG_TIME_SHIFT }, 229 { 180, 4 << WM831X_CHG_TIME_SHIFT }, 230 { 210, 5 << WM831X_CHG_TIME_SHIFT }, 231 { 240, 6 << WM831X_CHG_TIME_SHIFT }, 232 { 270, 7 << WM831X_CHG_TIME_SHIFT }, 233 { 300, 8 << WM831X_CHG_TIME_SHIFT }, 234 { 330, 9 << WM831X_CHG_TIME_SHIFT }, 235 { 360, 10 << WM831X_CHG_TIME_SHIFT }, 236 { 390, 11 << WM831X_CHG_TIME_SHIFT }, 237 { 420, 12 << WM831X_CHG_TIME_SHIFT }, 238 { 450, 13 << WM831X_CHG_TIME_SHIFT }, 239 { 480, 14 << WM831X_CHG_TIME_SHIFT }, 240 { 510, 15 << WM831X_CHG_TIME_SHIFT }, 241}; 242 243static void wm831x_battery_apply_config(struct wm831x *wm831x, 244 const struct chg_map *map, int count, int val, 245 int *reg, const char *name, 246 const char *units) 247{ 248 int i; 249 250 for (i = 0; i < count; i++) 251 if (val == map[i].val) 252 break; 253 if (i == count) { 254 dev_err(wm831x->dev, "Invalid %s %d%s\n", 255 name, val, units); 256 } else { 257 *reg |= map[i].reg_val; 258 dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units); 259 } 260} 261 262static void wm831x_config_battery(struct wm831x *wm831x) 263{ 264 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data; 265 struct wm831x_battery_pdata *pdata; 266 int ret, reg1, reg2; 267 268 if (!wm831x_pdata || !wm831x_pdata->battery) { 269 dev_warn(wm831x->dev, 270 "No battery charger configuration\n"); 271 return; 272 } 273 274 pdata = wm831x_pdata->battery; 275 276 reg1 = 0; 277 reg2 = 0; 278 279 if (!pdata->enable) { 280 dev_info(wm831x->dev, "Battery charger disabled\n"); 281 return; 282 } 283 284 reg1 |= WM831X_CHG_ENA; 285 if (pdata->off_mask) 286 reg2 |= WM831X_CHG_OFF_MSK; 287 if (pdata->fast_enable) 288 reg1 |= WM831X_CHG_FAST; 289 290 wm831x_battery_apply_config(wm831x, trickle_ilims, 291 ARRAY_SIZE(trickle_ilims), 292 pdata->trickle_ilim, ®2, 293 "trickle charge current limit", "mA"); 294 295 wm831x_battery_apply_config(wm831x, vsels, ARRAY_SIZE(vsels), 296 pdata->vsel, ®2, 297 "target voltage", "mV"); 298 299 wm831x_battery_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims), 300 pdata->fast_ilim, ®2, 301 "fast charge current limit", "mA"); 302 303 wm831x_battery_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms), 304 pdata->eoc_iterm, ®1, 305 "end of charge current threshold", "mA"); 306 307 wm831x_battery_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times), 308 pdata->timeout, ®2, 309 "charger timeout", "min"); 310 311 ret = wm831x_reg_unlock(wm831x); 312 if (ret != 0) { 313 dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret); 314 return; 315 } 316 317 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1, 318 WM831X_CHG_ENA_MASK | 319 WM831X_CHG_FAST_MASK | 320 WM831X_CHG_ITERM_MASK, 321 reg1); 322 if (ret != 0) 323 dev_err(wm831x->dev, "Failed to set charger control 1: %d\n", 324 ret); 325 326 ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2, 327 WM831X_CHG_OFF_MSK | 328 WM831X_CHG_TIME_MASK | 329 WM831X_CHG_FAST_ILIM_MASK | 330 WM831X_CHG_TRKL_ILIM_MASK | 331 WM831X_CHG_VSEL_MASK, 332 reg2); 333 if (ret != 0) 334 dev_err(wm831x->dev, "Failed to set charger control 2: %d\n", 335 ret); 336 337 wm831x_reg_lock(wm831x); 338} 339 340static int wm831x_bat_check_status(struct wm831x *wm831x, int *status) 341{ 342 int ret; 343 344 ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS); 345 if (ret < 0) 346 return ret; 347 348 if (ret & WM831X_PWR_SRC_BATT) { 349 *status = POWER_SUPPLY_STATUS_DISCHARGING; 350 return 0; 351 } 352 353 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); 354 if (ret < 0) 355 return ret; 356 357 switch (ret & WM831X_CHG_STATE_MASK) { 358 case WM831X_CHG_STATE_OFF: 359 *status = POWER_SUPPLY_STATUS_NOT_CHARGING; 360 break; 361 case WM831X_CHG_STATE_TRICKLE: 362 case WM831X_CHG_STATE_FAST: 363 *status = POWER_SUPPLY_STATUS_CHARGING; 364 break; 365 366 default: 367 *status = POWER_SUPPLY_STATUS_UNKNOWN; 368 break; 369 } 370 371 return 0; 372} 373 374static int wm831x_bat_check_type(struct wm831x *wm831x, int *type) 375{ 376 int ret; 377 378 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); 379 if (ret < 0) 380 return ret; 381 382 switch (ret & WM831X_CHG_STATE_MASK) { 383 case WM831X_CHG_STATE_TRICKLE: 384 case WM831X_CHG_STATE_TRICKLE_OT: 385 *type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 386 break; 387 case WM831X_CHG_STATE_FAST: 388 case WM831X_CHG_STATE_FAST_OT: 389 *type = POWER_SUPPLY_CHARGE_TYPE_FAST; 390 break; 391 default: 392 *type = POWER_SUPPLY_CHARGE_TYPE_NONE; 393 break; 394 } 395 396 return 0; 397} 398 399static int wm831x_bat_check_health(struct wm831x *wm831x, int *health) 400{ 401 int ret; 402 403 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS); 404 if (ret < 0) 405 return ret; 406 407 if (ret & WM831X_BATT_HOT_STS) { 408 *health = POWER_SUPPLY_HEALTH_OVERHEAT; 409 return 0; 410 } 411 412 if (ret & WM831X_BATT_COLD_STS) { 413 *health = POWER_SUPPLY_HEALTH_COLD; 414 return 0; 415 } 416 417 if (ret & WM831X_BATT_OV_STS) { 418 *health = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 419 return 0; 420 } 421 422 switch (ret & WM831X_CHG_STATE_MASK) { 423 case WM831X_CHG_STATE_TRICKLE_OT: 424 case WM831X_CHG_STATE_FAST_OT: 425 *health = POWER_SUPPLY_HEALTH_OVERHEAT; 426 break; 427 case WM831X_CHG_STATE_DEFECTIVE: 428 *health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 429 break; 430 default: 431 *health = POWER_SUPPLY_HEALTH_GOOD; 432 break; 433 } 434 435 return 0; 436} 437 438static int wm831x_bat_get_prop(struct power_supply *psy, 439 enum power_supply_property psp, 440 union power_supply_propval *val) 441{ 442 struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev.parent); 443 struct wm831x *wm831x = wm831x_power->wm831x; 444 int ret = 0; 445 446 switch (psp) { 447 case POWER_SUPPLY_PROP_STATUS: 448 ret = wm831x_bat_check_status(wm831x, &val->intval); 449 break; 450 case POWER_SUPPLY_PROP_ONLINE: 451 ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT, 452 val); 453 break; 454 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 455 ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val); 456 break; 457 case POWER_SUPPLY_PROP_HEALTH: 458 ret = wm831x_bat_check_health(wm831x, &val->intval); 459 break; 460 case POWER_SUPPLY_PROP_CHARGE_TYPE: 461 ret = wm831x_bat_check_type(wm831x, &val->intval); 462 break; 463 default: 464 ret = -EINVAL; 465 break; 466 } 467 468 return ret; 469} 470 471static const enum power_supply_property wm831x_bat_props[] = { 472 POWER_SUPPLY_PROP_STATUS, 473 POWER_SUPPLY_PROP_ONLINE, 474 POWER_SUPPLY_PROP_VOLTAGE_NOW, 475 POWER_SUPPLY_PROP_HEALTH, 476 POWER_SUPPLY_PROP_CHARGE_TYPE, 477}; 478 479static const char * const wm831x_bat_irqs[] = { 480 "BATT HOT", 481 "BATT COLD", 482 "BATT FAIL", 483 "OV", 484 "END", 485 "TO", 486 "MODE", 487 "START", 488}; 489 490static irqreturn_t wm831x_bat_irq(int irq, void *data) 491{ 492 struct wm831x_power *wm831x_power = data; 493 struct wm831x *wm831x = wm831x_power->wm831x; 494 495 dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq); 496 497 /* The battery charger is autonomous so we don't need to do 498 * anything except kick user space */ 499 if (wm831x_power->have_battery) 500 power_supply_changed(wm831x_power->battery); 501 502 return IRQ_HANDLED; 503} 504 505 506/********************************************************************* 507 * Initialisation 508 *********************************************************************/ 509 510static irqreturn_t wm831x_syslo_irq(int irq, void *data) 511{ 512 struct wm831x_power *wm831x_power = data; 513 struct wm831x *wm831x = wm831x_power->wm831x; 514 515 /* Not much we can actually *do* but tell people for 516 * posterity, we're probably about to run out of power. */ 517 dev_crit(wm831x->dev, "SYSVDD under voltage\n"); 518 519 return IRQ_HANDLED; 520} 521 522static irqreturn_t wm831x_pwr_src_irq(int irq, void *data) 523{ 524 struct wm831x_power *wm831x_power = data; 525 struct wm831x *wm831x = wm831x_power->wm831x; 526 527 dev_dbg(wm831x->dev, "Power source changed\n"); 528 529 /* Just notify for everything - little harm in overnotifying. */ 530 if (wm831x_power->have_battery) 531 power_supply_changed(wm831x_power->battery); 532 power_supply_changed(wm831x_power->usb); 533 power_supply_changed(wm831x_power->wall); 534 535 return IRQ_HANDLED; 536} 537 538static int wm831x_power_probe(struct platform_device *pdev) 539{ 540 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 541 struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data; 542 struct wm831x_power *power; 543 int ret, irq, i; 544 545 power = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_power), 546 GFP_KERNEL); 547 if (power == NULL) 548 return -ENOMEM; 549 550 power->wm831x = wm831x; 551 platform_set_drvdata(pdev, power); 552 553 if (wm831x_pdata && wm831x_pdata->wm831x_num) { 554 snprintf(power->wall_name, sizeof(power->wall_name), 555 "wm831x-wall.%d", wm831x_pdata->wm831x_num); 556 snprintf(power->battery_name, sizeof(power->wall_name), 557 "wm831x-battery.%d", wm831x_pdata->wm831x_num); 558 snprintf(power->usb_name, sizeof(power->wall_name), 559 "wm831x-usb.%d", wm831x_pdata->wm831x_num); 560 } else { 561 snprintf(power->wall_name, sizeof(power->wall_name), 562 "wm831x-wall"); 563 snprintf(power->battery_name, sizeof(power->wall_name), 564 "wm831x-battery"); 565 snprintf(power->usb_name, sizeof(power->wall_name), 566 "wm831x-usb"); 567 } 568 569 /* We ignore configuration failures since we can still read back 570 * the status without enabling the charger. 571 */ 572 wm831x_config_battery(wm831x); 573 574 power->wall_desc.name = power->wall_name; 575 power->wall_desc.type = POWER_SUPPLY_TYPE_MAINS; 576 power->wall_desc.properties = wm831x_wall_props; 577 power->wall_desc.num_properties = ARRAY_SIZE(wm831x_wall_props); 578 power->wall_desc.get_property = wm831x_wall_get_prop; 579 power->wall = devm_power_supply_register(&pdev->dev, 580 &power->wall_desc, 581 NULL); 582 if (IS_ERR(power->wall)) { 583 ret = PTR_ERR(power->wall); 584 goto err; 585 } 586 587 power->usb_desc.name = power->usb_name, 588 power->usb_desc.type = POWER_SUPPLY_TYPE_USB; 589 power->usb_desc.properties = wm831x_usb_props; 590 power->usb_desc.num_properties = ARRAY_SIZE(wm831x_usb_props); 591 power->usb_desc.get_property = wm831x_usb_get_prop; 592 power->usb = devm_power_supply_register(&pdev->dev, 593 &power->usb_desc, 594 NULL); 595 if (IS_ERR(power->usb)) { 596 ret = PTR_ERR(power->usb); 597 goto err_wall; 598 } 599 600 ret = wm831x_reg_read(wm831x, WM831X_CHARGER_CONTROL_1); 601 if (ret < 0) 602 goto err_wall; 603 power->have_battery = ret & WM831X_CHG_ENA; 604 605 if (power->have_battery) { 606 power->battery_desc.name = power->battery_name; 607 power->battery_desc.properties = wm831x_bat_props; 608 power->battery_desc.num_properties = ARRAY_SIZE(wm831x_bat_props); 609 power->battery_desc.get_property = wm831x_bat_get_prop; 610 power->battery_desc.use_for_apm = 1; 611 power->battery = devm_power_supply_register(&pdev->dev, 612 &power->battery_desc, 613 NULL); 614 if (IS_ERR(power->battery)) { 615 ret = PTR_ERR(power->battery); 616 goto err_usb; 617 } 618 } 619 620 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO")); 621 ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq, 622 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "System power low", 623 power); 624 if (ret != 0) { 625 dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n", 626 irq, ret); 627 goto err_battery; 628 } 629 630 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC")); 631 ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq, 632 IRQF_TRIGGER_RISING | IRQF_ONESHOT, "Power source", 633 power); 634 if (ret != 0) { 635 dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n", 636 irq, ret); 637 goto err_syslo; 638 } 639 640 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) { 641 irq = wm831x_irq(wm831x, 642 platform_get_irq_byname(pdev, 643 wm831x_bat_irqs[i])); 644 ret = request_threaded_irq(irq, NULL, wm831x_bat_irq, 645 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 646 wm831x_bat_irqs[i], 647 power); 648 if (ret != 0) { 649 dev_err(&pdev->dev, 650 "Failed to request %s IRQ %d: %d\n", 651 wm831x_bat_irqs[i], irq, ret); 652 goto err_bat_irq; 653 } 654 } 655 656 power->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0); 657 ret = PTR_ERR_OR_ZERO(power->usb_phy); 658 659 switch (ret) { 660 case 0: 661 power->usb_notify.notifier_call = wm831x_usb_limit_change; 662 ret = usb_register_notifier(power->usb_phy, &power->usb_notify); 663 if (ret) { 664 dev_err(&pdev->dev, "Failed to register notifier: %d\n", 665 ret); 666 goto err_bat_irq; 667 } 668 break; 669 case -EINVAL: 670 case -ENODEV: 671 /* ignore missing usb-phy, it's optional */ 672 power->usb_phy = NULL; 673 ret = 0; 674 break; 675 default: 676 dev_err(&pdev->dev, "Failed to find USB phy: %d\n", ret); 677 fallthrough; 678 case -EPROBE_DEFER: 679 goto err_bat_irq; 680 } 681 682 return ret; 683 684err_bat_irq: 685 --i; 686 for (; i >= 0; i--) { 687 irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]); 688 free_irq(irq, power); 689 } 690 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC")); 691 free_irq(irq, power); 692err_syslo: 693 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO")); 694 free_irq(irq, power); 695err_battery: 696err_usb: 697err_wall: 698err: 699 return ret; 700} 701 702static void wm831x_power_remove(struct platform_device *pdev) 703{ 704 struct wm831x_power *wm831x_power = platform_get_drvdata(pdev); 705 struct wm831x *wm831x = wm831x_power->wm831x; 706 int irq, i; 707 708 if (wm831x_power->usb_phy) { 709 usb_unregister_notifier(wm831x_power->usb_phy, 710 &wm831x_power->usb_notify); 711 } 712 713 for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) { 714 irq = wm831x_irq(wm831x, 715 platform_get_irq_byname(pdev, 716 wm831x_bat_irqs[i])); 717 free_irq(irq, wm831x_power); 718 } 719 720 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "PWR SRC")); 721 free_irq(irq, wm831x_power); 722 723 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "SYSLO")); 724 free_irq(irq, wm831x_power); 725} 726 727static struct platform_driver wm831x_power_driver = { 728 .probe = wm831x_power_probe, 729 .remove = wm831x_power_remove, 730 .driver = { 731 .name = "wm831x-power", 732 }, 733}; 734 735module_platform_driver(wm831x_power_driver); 736 737MODULE_DESCRIPTION("Power supply driver for WM831x PMICs"); 738MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 739MODULE_LICENSE("GPL"); 740MODULE_ALIAS("platform:wm831x-power");
~/
Read-only file preview.