1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // wm831x-dcdc.c -- DC-DC buck converter driver for the WM831x series 4 // 5 // Copyright 2009 Wolfson Microelectronics PLC. 6 // 7 // Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 9 #include <linux/module.h> 10 #include <linux/moduleparam.h> 11 #include <linux/init.h> 12 #include <linux/bitops.h> 13 #include <linux/err.h> 14 #include <linux/i2c.h> 15 #include <linux/platform_device.h> 16 #include <linux/regulator/driver.h> 17 #include <linux/regulator/machine.h> 18 #include <linux/gpio/consumer.h> 19 #include <linux/slab.h> 20 21 #include <linux/mfd/wm831x/core.h> 22 #include <linux/mfd/wm831x/regulator.h> 23 #include <linux/mfd/wm831x/pdata.h> 24 25 #define WM831X_BUCKV_MAX_SELECTOR 0x68 26 #define WM831X_BUCKP_MAX_SELECTOR 0x66 27 28 #define WM831X_DCDC_MODE_FAST 0 29 #define WM831X_DCDC_MODE_NORMAL 1 30 #define WM831X_DCDC_MODE_IDLE 2 31 #define WM831X_DCDC_MODE_STANDBY 3 32 33 #define WM831X_DCDC_MAX_NAME 9 34 35 /* Register offsets in control block */ 36 #define WM831X_DCDC_CONTROL_1 0 37 #define WM831X_DCDC_CONTROL_2 1 38 #define WM831X_DCDC_ON_CONFIG 2 39 #define WM831X_DCDC_SLEEP_CONTROL 3 40 #define WM831X_DCDC_DVS_CONTROL 4 41 42 /* 43 * Shared 44 */ 45 46 struct wm831x_dcdc { 47 char name[WM831X_DCDC_MAX_NAME]; 48 char supply_name[WM831X_DCDC_MAX_NAME]; 49 struct regulator_desc desc; 50 int base; 51 struct wm831x *wm831x; 52 struct regulator_dev *regulator; 53 struct gpio_desc *dvs_gpiod; 54 int dvs_gpio_state; 55 int on_vsel; 56 int dvs_vsel; 57 }; 58 59 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) 60 61 { 62 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 63 struct wm831x *wm831x = dcdc->wm831x; 64 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 65 int val; 66 67 val = wm831x_reg_read(wm831x, reg); 68 if (val < 0) 69 return val; 70 71 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; 72 73 switch (val) { 74 case WM831X_DCDC_MODE_FAST: 75 return REGULATOR_MODE_FAST; 76 case WM831X_DCDC_MODE_NORMAL: 77 return REGULATOR_MODE_NORMAL; 78 case WM831X_DCDC_MODE_STANDBY: 79 return REGULATOR_MODE_STANDBY; 80 case WM831X_DCDC_MODE_IDLE: 81 return REGULATOR_MODE_IDLE; 82 default: 83 BUG(); 84 return -EINVAL; 85 } 86 } 87 88 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 89 unsigned int mode) 90 { 91 int val; 92 93 switch (mode) { 94 case REGULATOR_MODE_FAST: 95 val = WM831X_DCDC_MODE_FAST; 96 break; 97 case REGULATOR_MODE_NORMAL: 98 val = WM831X_DCDC_MODE_NORMAL; 99 break; 100 case REGULATOR_MODE_STANDBY: 101 val = WM831X_DCDC_MODE_STANDBY; 102 break; 103 case REGULATOR_MODE_IDLE: 104 val = WM831X_DCDC_MODE_IDLE; 105 break; 106 default: 107 return -EINVAL; 108 } 109 110 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 111 val << WM831X_DC1_ON_MODE_SHIFT); 112 } 113 114 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 115 { 116 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 117 struct wm831x *wm831x = dcdc->wm831x; 118 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 119 120 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 121 } 122 123 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 124 unsigned int mode) 125 { 126 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 127 struct wm831x *wm831x = dcdc->wm831x; 128 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 129 130 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 131 } 132 133 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 134 { 135 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 136 struct wm831x *wm831x = dcdc->wm831x; 137 int ret; 138 139 /* First, check for errors */ 140 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 141 if (ret < 0) 142 return ret; 143 144 if (ret & (1 << rdev_get_id(rdev))) { 145 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 146 rdev_get_id(rdev) + 1); 147 return REGULATOR_STATUS_ERROR; 148 } 149 150 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 151 if (rdev_get_id(rdev) < 2) { 152 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 153 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 154 rdev_get_id(rdev) + 1); 155 return REGULATOR_STATUS_ERROR; 156 } 157 158 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 159 dev_dbg(wm831x->dev, "DCDC%d over current\n", 160 rdev_get_id(rdev) + 1); 161 return REGULATOR_STATUS_ERROR; 162 } 163 } 164 165 /* Is the regulator on? */ 166 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 167 if (ret < 0) 168 return ret; 169 if (!(ret & (1 << rdev_get_id(rdev)))) 170 return REGULATOR_STATUS_OFF; 171 172 /* TODO: When we handle hardware control modes so we can report the 173 * current mode. */ 174 return REGULATOR_STATUS_ON; 175 } 176 177 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 178 { 179 struct wm831x_dcdc *dcdc = data; 180 181 regulator_lock(dcdc->regulator); 182 regulator_notifier_call_chain(dcdc->regulator, 183 REGULATOR_EVENT_UNDER_VOLTAGE, 184 NULL); 185 regulator_unlock(dcdc->regulator); 186 187 return IRQ_HANDLED; 188 } 189 190 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 191 { 192 struct wm831x_dcdc *dcdc = data; 193 194 regulator_lock(dcdc->regulator); 195 regulator_notifier_call_chain(dcdc->regulator, 196 REGULATOR_EVENT_OVER_CURRENT, 197 NULL); 198 regulator_unlock(dcdc->regulator); 199 200 return IRQ_HANDLED; 201 } 202 203 /* 204 * BUCKV specifics 205 */ 206 207 static const struct linear_range wm831x_buckv_ranges[] = { 208 REGULATOR_LINEAR_RANGE(600000, 0, 0x7, 0), 209 REGULATOR_LINEAR_RANGE(600000, 0x8, 0x68, 12500), 210 }; 211 212 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 213 { 214 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 215 216 if (state == dcdc->dvs_gpio_state) 217 return 0; 218 219 dcdc->dvs_gpio_state = state; 220 gpiod_set_value(dcdc->dvs_gpiod, state); 221 222 /* Should wait for DVS state change to be asserted if we have 223 * a GPIO for it, for now assume the device is configured 224 * for the fastest possible transition. 225 */ 226 227 return 0; 228 } 229 230 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev, 231 unsigned vsel) 232 { 233 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 234 struct wm831x *wm831x = dcdc->wm831x; 235 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 236 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 237 int ret; 238 239 /* If this value is already set then do a GPIO update if we can */ 240 if (dcdc->dvs_gpiod && dcdc->on_vsel == vsel) 241 return wm831x_buckv_set_dvs(rdev, 0); 242 243 if (dcdc->dvs_gpiod && dcdc->dvs_vsel == vsel) 244 return wm831x_buckv_set_dvs(rdev, 1); 245 246 /* Always set the ON status to the minimum voltage */ 247 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 248 if (ret < 0) 249 return ret; 250 dcdc->on_vsel = vsel; 251 252 if (!dcdc->dvs_gpiod) 253 return ret; 254 255 /* Kick the voltage transition now */ 256 ret = wm831x_buckv_set_dvs(rdev, 0); 257 if (ret < 0) 258 return ret; 259 260 /* 261 * If this VSEL is higher than the last one we've seen then 262 * remember it as the DVS VSEL. This is optimised for CPUfreq 263 * usage where we want to get to the highest voltage very 264 * quickly. 265 */ 266 if (vsel > dcdc->dvs_vsel) { 267 ret = wm831x_set_bits(wm831x, dvs_reg, 268 WM831X_DC1_DVS_VSEL_MASK, 269 vsel); 270 if (ret == 0) 271 dcdc->dvs_vsel = vsel; 272 else 273 dev_warn(wm831x->dev, 274 "Failed to set DCDC DVS VSEL: %d\n", ret); 275 } 276 277 return 0; 278 } 279 280 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 281 int uV) 282 { 283 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 284 struct wm831x *wm831x = dcdc->wm831x; 285 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 286 int vsel; 287 288 vsel = regulator_map_voltage_linear_range(rdev, uV, uV); 289 if (vsel < 0) 290 return vsel; 291 292 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 293 } 294 295 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) 296 { 297 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 298 299 if (dcdc->dvs_gpiod && dcdc->dvs_gpio_state) 300 return dcdc->dvs_vsel; 301 else 302 return dcdc->on_vsel; 303 } 304 305 /* Current limit options */ 306 static const unsigned int wm831x_dcdc_ilim[] = { 307 125000, 250000, 375000, 500000, 625000, 750000, 875000, 1000000 308 }; 309 310 static const struct regulator_ops wm831x_buckv_ops = { 311 .set_voltage_sel = wm831x_buckv_set_voltage_sel, 312 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 313 .list_voltage = regulator_list_voltage_linear_range, 314 .map_voltage = regulator_map_voltage_linear_range, 315 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 316 .set_current_limit = regulator_set_current_limit_regmap, 317 .get_current_limit = regulator_get_current_limit_regmap, 318 319 .is_enabled = regulator_is_enabled_regmap, 320 .enable = regulator_enable_regmap, 321 .disable = regulator_disable_regmap, 322 .get_status = wm831x_dcdc_get_status, 323 .get_mode = wm831x_dcdc_get_mode, 324 .set_mode = wm831x_dcdc_set_mode, 325 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 326 }; 327 328 /* 329 * Set up DVS control. We just log errors since we can still run 330 * (with reduced performance) if we fail. 331 */ 332 static void wm831x_buckv_dvs_init(struct platform_device *pdev, 333 struct wm831x_dcdc *dcdc, 334 struct wm831x_buckv_pdata *pdata) 335 { 336 struct wm831x *wm831x = dcdc->wm831x; 337 int ret; 338 u16 ctrl; 339 340 if (!pdata) 341 return; 342 343 /* gpiolib won't let us read the GPIO status so pick the higher 344 * of the two existing voltages so we take it as platform data. 345 */ 346 dcdc->dvs_gpio_state = pdata->dvs_init_state; 347 348 dcdc->dvs_gpiod = devm_gpiod_get(&pdev->dev, "dvs", 349 dcdc->dvs_gpio_state ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW); 350 if (IS_ERR(dcdc->dvs_gpiod)) { 351 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %ld\n", 352 dcdc->name, PTR_ERR(dcdc->dvs_gpiod)); 353 return; 354 } 355 356 switch (pdata->dvs_control_src) { 357 case 1: 358 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 359 break; 360 case 2: 361 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 362 break; 363 default: 364 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 365 pdata->dvs_control_src, dcdc->name); 366 return; 367 } 368 369 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 370 * to make bootstrapping a bit smoother. 371 */ 372 if (!dcdc->dvs_vsel) { 373 ret = wm831x_set_bits(wm831x, 374 dcdc->base + WM831X_DCDC_DVS_CONTROL, 375 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 376 if (ret == 0) 377 dcdc->dvs_vsel = dcdc->on_vsel; 378 else 379 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 380 ret); 381 } 382 383 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 384 WM831X_DC1_DVS_SRC_MASK, ctrl); 385 if (ret < 0) { 386 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 387 dcdc->name, ret); 388 } 389 } 390 391 static int wm831x_buckv_probe(struct platform_device *pdev) 392 { 393 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 394 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 395 struct regulator_config config = { }; 396 int id; 397 struct wm831x_dcdc *dcdc; 398 struct resource *res; 399 int ret, irq; 400 401 if (pdata && pdata->wm831x_num) 402 id = (pdata->wm831x_num * 10) + 1; 403 else 404 id = 0; 405 id = pdev->id - id; 406 407 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 408 409 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 410 GFP_KERNEL); 411 if (!dcdc) 412 return -ENOMEM; 413 414 dcdc->wm831x = wm831x; 415 416 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 417 if (res == NULL) { 418 dev_err(&pdev->dev, "No REG resource\n"); 419 ret = -EINVAL; 420 goto err; 421 } 422 dcdc->base = res->start; 423 424 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 425 dcdc->desc.name = dcdc->name; 426 427 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 428 "DC%dVDD", id + 1); 429 dcdc->desc.supply_name = dcdc->supply_name; 430 431 dcdc->desc.id = id; 432 dcdc->desc.type = REGULATOR_VOLTAGE; 433 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 434 dcdc->desc.linear_ranges = wm831x_buckv_ranges; 435 dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges); 436 dcdc->desc.ops = &wm831x_buckv_ops; 437 dcdc->desc.owner = THIS_MODULE; 438 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 439 dcdc->desc.enable_mask = 1 << id; 440 dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2; 441 dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK; 442 dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim); 443 dcdc->desc.curr_table = wm831x_dcdc_ilim; 444 445 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 446 if (ret < 0) { 447 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 448 goto err; 449 } 450 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 451 452 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 453 if (ret < 0) { 454 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 455 goto err; 456 } 457 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 458 459 if (pdata && pdata->dcdc[id]) 460 wm831x_buckv_dvs_init(pdev, dcdc, 461 pdata->dcdc[id]->driver_data); 462 463 config.dev = pdev->dev.parent; 464 if (pdata) 465 config.init_data = pdata->dcdc[id]; 466 config.driver_data = dcdc; 467 config.regmap = wm831x->regmap; 468 469 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 470 &config); 471 if (IS_ERR(dcdc->regulator)) { 472 ret = PTR_ERR(dcdc->regulator); 473 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 474 id + 1, ret); 475 goto err; 476 } 477 478 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 479 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 480 wm831x_dcdc_uv_irq, 481 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 482 dcdc->name, dcdc); 483 if (ret != 0) { 484 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 485 irq, ret); 486 goto err; 487 } 488 489 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")); 490 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 491 wm831x_dcdc_oc_irq, 492 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 493 dcdc->name, dcdc); 494 if (ret != 0) { 495 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 496 irq, ret); 497 goto err; 498 } 499 500 platform_set_drvdata(pdev, dcdc); 501 502 return 0; 503 504 err: 505 return ret; 506 } 507 508 static struct platform_driver wm831x_buckv_driver = { 509 .probe = wm831x_buckv_probe, 510 .driver = { 511 .name = "wm831x-buckv", 512 }, 513 }; 514 515 /* 516 * BUCKP specifics 517 */ 518 519 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV) 520 { 521 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 522 struct wm831x *wm831x = dcdc->wm831x; 523 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 524 int sel; 525 526 sel = regulator_map_voltage_linear(rdev, uV, uV); 527 if (sel < 0) 528 return sel; 529 530 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel); 531 } 532 533 static const struct regulator_ops wm831x_buckp_ops = { 534 .set_voltage_sel = regulator_set_voltage_sel_regmap, 535 .get_voltage_sel = regulator_get_voltage_sel_regmap, 536 .list_voltage = regulator_list_voltage_linear, 537 .map_voltage = regulator_map_voltage_linear, 538 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 539 540 .is_enabled = regulator_is_enabled_regmap, 541 .enable = regulator_enable_regmap, 542 .disable = regulator_disable_regmap, 543 .get_status = wm831x_dcdc_get_status, 544 .get_mode = wm831x_dcdc_get_mode, 545 .set_mode = wm831x_dcdc_set_mode, 546 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 547 }; 548 549 static int wm831x_buckp_probe(struct platform_device *pdev) 550 { 551 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 552 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 553 struct regulator_config config = { }; 554 int id; 555 struct wm831x_dcdc *dcdc; 556 struct resource *res; 557 int ret, irq; 558 559 if (pdata && pdata->wm831x_num) 560 id = (pdata->wm831x_num * 10) + 1; 561 else 562 id = 0; 563 id = pdev->id - id; 564 565 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 566 567 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 568 GFP_KERNEL); 569 if (!dcdc) 570 return -ENOMEM; 571 572 dcdc->wm831x = wm831x; 573 574 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 575 if (res == NULL) { 576 dev_err(&pdev->dev, "No REG resource\n"); 577 ret = -EINVAL; 578 goto err; 579 } 580 dcdc->base = res->start; 581 582 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 583 dcdc->desc.name = dcdc->name; 584 585 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 586 "DC%dVDD", id + 1); 587 dcdc->desc.supply_name = dcdc->supply_name; 588 589 dcdc->desc.id = id; 590 dcdc->desc.type = REGULATOR_VOLTAGE; 591 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 592 dcdc->desc.ops = &wm831x_buckp_ops; 593 dcdc->desc.owner = THIS_MODULE; 594 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 595 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK; 596 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 597 dcdc->desc.enable_mask = 1 << id; 598 dcdc->desc.min_uV = 850000; 599 dcdc->desc.uV_step = 25000; 600 601 config.dev = pdev->dev.parent; 602 if (pdata) 603 config.init_data = pdata->dcdc[id]; 604 config.driver_data = dcdc; 605 config.regmap = wm831x->regmap; 606 607 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 608 &config); 609 if (IS_ERR(dcdc->regulator)) { 610 ret = PTR_ERR(dcdc->regulator); 611 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 612 id + 1, ret); 613 goto err; 614 } 615 616 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 617 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 618 wm831x_dcdc_uv_irq, 619 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 620 dcdc->name, dcdc); 621 if (ret != 0) { 622 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 623 irq, ret); 624 goto err; 625 } 626 627 platform_set_drvdata(pdev, dcdc); 628 629 return 0; 630 631 err: 632 return ret; 633 } 634 635 static struct platform_driver wm831x_buckp_driver = { 636 .probe = wm831x_buckp_probe, 637 .driver = { 638 .name = "wm831x-buckp", 639 }, 640 }; 641 642 /* 643 * DCDC boost convertors 644 */ 645 646 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 647 { 648 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 649 struct wm831x *wm831x = dcdc->wm831x; 650 int ret; 651 652 /* First, check for errors */ 653 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 654 if (ret < 0) 655 return ret; 656 657 if (ret & (1 << rdev_get_id(rdev))) { 658 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 659 rdev_get_id(rdev) + 1); 660 return REGULATOR_STATUS_ERROR; 661 } 662 663 /* Is the regulator on? */ 664 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 665 if (ret < 0) 666 return ret; 667 if (ret & (1 << rdev_get_id(rdev))) 668 return REGULATOR_STATUS_ON; 669 else 670 return REGULATOR_STATUS_OFF; 671 } 672 673 static const struct regulator_ops wm831x_boostp_ops = { 674 .get_status = wm831x_boostp_get_status, 675 676 .is_enabled = regulator_is_enabled_regmap, 677 .enable = regulator_enable_regmap, 678 .disable = regulator_disable_regmap, 679 }; 680 681 static int wm831x_boostp_probe(struct platform_device *pdev) 682 { 683 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 684 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 685 struct regulator_config config = { }; 686 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 687 struct wm831x_dcdc *dcdc; 688 struct resource *res; 689 int ret, irq; 690 691 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 692 693 if (pdata == NULL || pdata->dcdc[id] == NULL) 694 return -ENODEV; 695 696 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 697 if (!dcdc) 698 return -ENOMEM; 699 700 dcdc->wm831x = wm831x; 701 702 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 703 if (res == NULL) { 704 dev_err(&pdev->dev, "No REG resource\n"); 705 return -EINVAL; 706 } 707 dcdc->base = res->start; 708 709 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 710 dcdc->desc.name = dcdc->name; 711 dcdc->desc.id = id; 712 dcdc->desc.type = REGULATOR_VOLTAGE; 713 dcdc->desc.ops = &wm831x_boostp_ops; 714 dcdc->desc.owner = THIS_MODULE; 715 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 716 dcdc->desc.enable_mask = 1 << id; 717 718 config.dev = pdev->dev.parent; 719 if (pdata) 720 config.init_data = pdata->dcdc[id]; 721 config.driver_data = dcdc; 722 config.regmap = wm831x->regmap; 723 724 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 725 &config); 726 if (IS_ERR(dcdc->regulator)) { 727 ret = PTR_ERR(dcdc->regulator); 728 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 729 id + 1, ret); 730 return ret; 731 } 732 733 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 734 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 735 wm831x_dcdc_uv_irq, 736 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 737 dcdc->name, 738 dcdc); 739 if (ret != 0) { 740 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 741 irq, ret); 742 return ret; 743 } 744 745 platform_set_drvdata(pdev, dcdc); 746 747 return 0; 748 } 749 750 static struct platform_driver wm831x_boostp_driver = { 751 .probe = wm831x_boostp_probe, 752 .driver = { 753 .name = "wm831x-boostp", 754 }, 755 }; 756 757 /* 758 * External Power Enable 759 * 760 * These aren't actually DCDCs but look like them in hardware so share 761 * code. 762 */ 763 764 #define WM831X_EPE_BASE 6 765 766 static const struct regulator_ops wm831x_epe_ops = { 767 .is_enabled = regulator_is_enabled_regmap, 768 .enable = regulator_enable_regmap, 769 .disable = regulator_disable_regmap, 770 .get_status = wm831x_dcdc_get_status, 771 }; 772 773 static int wm831x_epe_probe(struct platform_device *pdev) 774 { 775 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 776 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 777 struct regulator_config config = { }; 778 int id = pdev->id % ARRAY_SIZE(pdata->epe); 779 struct wm831x_dcdc *dcdc; 780 int ret; 781 782 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 783 784 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 785 if (!dcdc) 786 return -ENOMEM; 787 788 dcdc->wm831x = wm831x; 789 790 /* For current parts this is correct; probably need to revisit 791 * in future. 792 */ 793 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 794 dcdc->desc.name = dcdc->name; 795 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 796 dcdc->desc.ops = &wm831x_epe_ops; 797 dcdc->desc.type = REGULATOR_VOLTAGE; 798 dcdc->desc.owner = THIS_MODULE; 799 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 800 dcdc->desc.enable_mask = 1 << dcdc->desc.id; 801 802 config.dev = pdev->dev.parent; 803 if (pdata) 804 config.init_data = pdata->epe[id]; 805 config.driver_data = dcdc; 806 config.regmap = wm831x->regmap; 807 808 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 809 &config); 810 if (IS_ERR(dcdc->regulator)) { 811 ret = PTR_ERR(dcdc->regulator); 812 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 813 id + 1, ret); 814 goto err; 815 } 816 817 platform_set_drvdata(pdev, dcdc); 818 819 return 0; 820 821 err: 822 return ret; 823 } 824 825 static struct platform_driver wm831x_epe_driver = { 826 .probe = wm831x_epe_probe, 827 .driver = { 828 .name = "wm831x-epe", 829 }, 830 }; 831 832 static struct platform_driver * const drivers[] = { 833 &wm831x_buckv_driver, 834 &wm831x_buckp_driver, 835 &wm831x_boostp_driver, 836 &wm831x_epe_driver, 837 }; 838 839 static int __init wm831x_dcdc_init(void) 840 { 841 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 842 } 843 subsys_initcall(wm831x_dcdc_init); 844 845 static void __exit wm831x_dcdc_exit(void) 846 { 847 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 848 } 849 module_exit(wm831x_dcdc_exit); 850 851 /* Module information */ 852 MODULE_AUTHOR("Mark Brown"); 853 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 854 MODULE_LICENSE("GPL"); 855 MODULE_ALIAS("platform:wm831x-buckv"); 856 MODULE_ALIAS("platform:wm831x-buckp"); 857 MODULE_ALIAS("platform:wm831x-boostp"); 858 MODULE_ALIAS("platform:wm831x-epe"); 859