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.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 int dvs_gpio; 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 regulator_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 gpio_set_value(dcdc->dvs_gpio, 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_gpio && dcdc->on_vsel == vsel) 241 return wm831x_buckv_set_dvs(rdev, 0); 242 243 if (dcdc->dvs_gpio && 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_gpio) 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_gpio && 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 || !pdata->dvs_gpio) 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 ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio, 349 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0, 350 "DCDC DVS"); 351 if (ret < 0) { 352 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 353 dcdc->name, ret); 354 return; 355 } 356 357 dcdc->dvs_gpio = pdata->dvs_gpio; 358 359 switch (pdata->dvs_control_src) { 360 case 1: 361 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 362 break; 363 case 2: 364 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 365 break; 366 default: 367 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 368 pdata->dvs_control_src, dcdc->name); 369 return; 370 } 371 372 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 373 * to make bootstrapping a bit smoother. 374 */ 375 if (!dcdc->dvs_vsel) { 376 ret = wm831x_set_bits(wm831x, 377 dcdc->base + WM831X_DCDC_DVS_CONTROL, 378 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 379 if (ret == 0) 380 dcdc->dvs_vsel = dcdc->on_vsel; 381 else 382 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 383 ret); 384 } 385 386 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 387 WM831X_DC1_DVS_SRC_MASK, ctrl); 388 if (ret < 0) { 389 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 390 dcdc->name, ret); 391 } 392 } 393 394 static int wm831x_buckv_probe(struct platform_device *pdev) 395 { 396 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 397 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 398 struct regulator_config config = { }; 399 int id; 400 struct wm831x_dcdc *dcdc; 401 struct resource *res; 402 int ret, irq; 403 404 if (pdata && pdata->wm831x_num) 405 id = (pdata->wm831x_num * 10) + 1; 406 else 407 id = 0; 408 id = pdev->id - id; 409 410 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 411 412 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 413 GFP_KERNEL); 414 if (!dcdc) 415 return -ENOMEM; 416 417 dcdc->wm831x = wm831x; 418 419 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 420 if (res == NULL) { 421 dev_err(&pdev->dev, "No REG resource\n"); 422 ret = -EINVAL; 423 goto err; 424 } 425 dcdc->base = res->start; 426 427 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 428 dcdc->desc.name = dcdc->name; 429 430 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 431 "DC%dVDD", id + 1); 432 dcdc->desc.supply_name = dcdc->supply_name; 433 434 dcdc->desc.id = id; 435 dcdc->desc.type = REGULATOR_VOLTAGE; 436 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 437 dcdc->desc.linear_ranges = wm831x_buckv_ranges; 438 dcdc->desc.n_linear_ranges = ARRAY_SIZE(wm831x_buckv_ranges); 439 dcdc->desc.ops = &wm831x_buckv_ops; 440 dcdc->desc.owner = THIS_MODULE; 441 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 442 dcdc->desc.enable_mask = 1 << id; 443 dcdc->desc.csel_reg = dcdc->base + WM831X_DCDC_CONTROL_2; 444 dcdc->desc.csel_mask = WM831X_DC1_HC_THR_MASK; 445 dcdc->desc.n_current_limits = ARRAY_SIZE(wm831x_dcdc_ilim); 446 dcdc->desc.curr_table = wm831x_dcdc_ilim; 447 448 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 449 if (ret < 0) { 450 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 451 goto err; 452 } 453 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 454 455 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 456 if (ret < 0) { 457 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 458 goto err; 459 } 460 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 461 462 if (pdata && pdata->dcdc[id]) 463 wm831x_buckv_dvs_init(pdev, dcdc, 464 pdata->dcdc[id]->driver_data); 465 466 config.dev = pdev->dev.parent; 467 if (pdata) 468 config.init_data = pdata->dcdc[id]; 469 config.driver_data = dcdc; 470 config.regmap = wm831x->regmap; 471 472 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 473 &config); 474 if (IS_ERR(dcdc->regulator)) { 475 ret = PTR_ERR(dcdc->regulator); 476 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 477 id + 1, ret); 478 goto err; 479 } 480 481 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 482 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 483 wm831x_dcdc_uv_irq, 484 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 485 dcdc->name, dcdc); 486 if (ret != 0) { 487 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 488 irq, ret); 489 goto err; 490 } 491 492 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")); 493 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 494 wm831x_dcdc_oc_irq, 495 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 496 dcdc->name, dcdc); 497 if (ret != 0) { 498 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 499 irq, ret); 500 goto err; 501 } 502 503 platform_set_drvdata(pdev, dcdc); 504 505 return 0; 506 507 err: 508 return ret; 509 } 510 511 static struct platform_driver wm831x_buckv_driver = { 512 .probe = wm831x_buckv_probe, 513 .driver = { 514 .name = "wm831x-buckv", 515 }, 516 }; 517 518 /* 519 * BUCKP specifics 520 */ 521 522 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV) 523 { 524 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 525 struct wm831x *wm831x = dcdc->wm831x; 526 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 527 int sel; 528 529 sel = regulator_map_voltage_linear(rdev, uV, uV); 530 if (sel < 0) 531 return sel; 532 533 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel); 534 } 535 536 static const struct regulator_ops wm831x_buckp_ops = { 537 .set_voltage_sel = regulator_set_voltage_sel_regmap, 538 .get_voltage_sel = regulator_get_voltage_sel_regmap, 539 .list_voltage = regulator_list_voltage_linear, 540 .map_voltage = regulator_map_voltage_linear, 541 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 542 543 .is_enabled = regulator_is_enabled_regmap, 544 .enable = regulator_enable_regmap, 545 .disable = regulator_disable_regmap, 546 .get_status = wm831x_dcdc_get_status, 547 .get_mode = wm831x_dcdc_get_mode, 548 .set_mode = wm831x_dcdc_set_mode, 549 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 550 }; 551 552 static int wm831x_buckp_probe(struct platform_device *pdev) 553 { 554 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 555 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 556 struct regulator_config config = { }; 557 int id; 558 struct wm831x_dcdc *dcdc; 559 struct resource *res; 560 int ret, irq; 561 562 if (pdata && pdata->wm831x_num) 563 id = (pdata->wm831x_num * 10) + 1; 564 else 565 id = 0; 566 id = pdev->id - id; 567 568 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 569 570 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 571 GFP_KERNEL); 572 if (!dcdc) 573 return -ENOMEM; 574 575 dcdc->wm831x = wm831x; 576 577 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 578 if (res == NULL) { 579 dev_err(&pdev->dev, "No REG resource\n"); 580 ret = -EINVAL; 581 goto err; 582 } 583 dcdc->base = res->start; 584 585 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 586 dcdc->desc.name = dcdc->name; 587 588 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 589 "DC%dVDD", id + 1); 590 dcdc->desc.supply_name = dcdc->supply_name; 591 592 dcdc->desc.id = id; 593 dcdc->desc.type = REGULATOR_VOLTAGE; 594 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 595 dcdc->desc.ops = &wm831x_buckp_ops; 596 dcdc->desc.owner = THIS_MODULE; 597 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 598 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK; 599 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 600 dcdc->desc.enable_mask = 1 << id; 601 dcdc->desc.min_uV = 850000; 602 dcdc->desc.uV_step = 25000; 603 604 config.dev = pdev->dev.parent; 605 if (pdata) 606 config.init_data = pdata->dcdc[id]; 607 config.driver_data = dcdc; 608 config.regmap = wm831x->regmap; 609 610 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 611 &config); 612 if (IS_ERR(dcdc->regulator)) { 613 ret = PTR_ERR(dcdc->regulator); 614 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 615 id + 1, ret); 616 goto err; 617 } 618 619 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 620 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 621 wm831x_dcdc_uv_irq, 622 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 623 dcdc->name, dcdc); 624 if (ret != 0) { 625 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 626 irq, ret); 627 goto err; 628 } 629 630 platform_set_drvdata(pdev, dcdc); 631 632 return 0; 633 634 err: 635 return ret; 636 } 637 638 static struct platform_driver wm831x_buckp_driver = { 639 .probe = wm831x_buckp_probe, 640 .driver = { 641 .name = "wm831x-buckp", 642 }, 643 }; 644 645 /* 646 * DCDC boost convertors 647 */ 648 649 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 650 { 651 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 652 struct wm831x *wm831x = dcdc->wm831x; 653 int ret; 654 655 /* First, check for errors */ 656 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 657 if (ret < 0) 658 return ret; 659 660 if (ret & (1 << rdev_get_id(rdev))) { 661 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 662 rdev_get_id(rdev) + 1); 663 return REGULATOR_STATUS_ERROR; 664 } 665 666 /* Is the regulator on? */ 667 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 668 if (ret < 0) 669 return ret; 670 if (ret & (1 << rdev_get_id(rdev))) 671 return REGULATOR_STATUS_ON; 672 else 673 return REGULATOR_STATUS_OFF; 674 } 675 676 static const struct regulator_ops wm831x_boostp_ops = { 677 .get_status = wm831x_boostp_get_status, 678 679 .is_enabled = regulator_is_enabled_regmap, 680 .enable = regulator_enable_regmap, 681 .disable = regulator_disable_regmap, 682 }; 683 684 static int wm831x_boostp_probe(struct platform_device *pdev) 685 { 686 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 687 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 688 struct regulator_config config = { }; 689 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 690 struct wm831x_dcdc *dcdc; 691 struct resource *res; 692 int ret, irq; 693 694 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 695 696 if (pdata == NULL || pdata->dcdc[id] == NULL) 697 return -ENODEV; 698 699 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 700 if (!dcdc) 701 return -ENOMEM; 702 703 dcdc->wm831x = wm831x; 704 705 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 706 if (res == NULL) { 707 dev_err(&pdev->dev, "No REG resource\n"); 708 return -EINVAL; 709 } 710 dcdc->base = res->start; 711 712 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 713 dcdc->desc.name = dcdc->name; 714 dcdc->desc.id = id; 715 dcdc->desc.type = REGULATOR_VOLTAGE; 716 dcdc->desc.ops = &wm831x_boostp_ops; 717 dcdc->desc.owner = THIS_MODULE; 718 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 719 dcdc->desc.enable_mask = 1 << id; 720 721 config.dev = pdev->dev.parent; 722 if (pdata) 723 config.init_data = pdata->dcdc[id]; 724 config.driver_data = dcdc; 725 config.regmap = wm831x->regmap; 726 727 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 728 &config); 729 if (IS_ERR(dcdc->regulator)) { 730 ret = PTR_ERR(dcdc->regulator); 731 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 732 id + 1, ret); 733 return ret; 734 } 735 736 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 737 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 738 wm831x_dcdc_uv_irq, 739 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 740 dcdc->name, 741 dcdc); 742 if (ret != 0) { 743 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 744 irq, ret); 745 return ret; 746 } 747 748 platform_set_drvdata(pdev, dcdc); 749 750 return 0; 751 } 752 753 static struct platform_driver wm831x_boostp_driver = { 754 .probe = wm831x_boostp_probe, 755 .driver = { 756 .name = "wm831x-boostp", 757 }, 758 }; 759 760 /* 761 * External Power Enable 762 * 763 * These aren't actually DCDCs but look like them in hardware so share 764 * code. 765 */ 766 767 #define WM831X_EPE_BASE 6 768 769 static const struct regulator_ops wm831x_epe_ops = { 770 .is_enabled = regulator_is_enabled_regmap, 771 .enable = regulator_enable_regmap, 772 .disable = regulator_disable_regmap, 773 .get_status = wm831x_dcdc_get_status, 774 }; 775 776 static int wm831x_epe_probe(struct platform_device *pdev) 777 { 778 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 779 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 780 struct regulator_config config = { }; 781 int id = pdev->id % ARRAY_SIZE(pdata->epe); 782 struct wm831x_dcdc *dcdc; 783 int ret; 784 785 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 786 787 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 788 if (!dcdc) 789 return -ENOMEM; 790 791 dcdc->wm831x = wm831x; 792 793 /* For current parts this is correct; probably need to revisit 794 * in future. 795 */ 796 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 797 dcdc->desc.name = dcdc->name; 798 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 799 dcdc->desc.ops = &wm831x_epe_ops; 800 dcdc->desc.type = REGULATOR_VOLTAGE; 801 dcdc->desc.owner = THIS_MODULE; 802 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 803 dcdc->desc.enable_mask = 1 << dcdc->desc.id; 804 805 config.dev = pdev->dev.parent; 806 if (pdata) 807 config.init_data = pdata->epe[id]; 808 config.driver_data = dcdc; 809 config.regmap = wm831x->regmap; 810 811 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 812 &config); 813 if (IS_ERR(dcdc->regulator)) { 814 ret = PTR_ERR(dcdc->regulator); 815 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 816 id + 1, ret); 817 goto err; 818 } 819 820 platform_set_drvdata(pdev, dcdc); 821 822 return 0; 823 824 err: 825 return ret; 826 } 827 828 static struct platform_driver wm831x_epe_driver = { 829 .probe = wm831x_epe_probe, 830 .driver = { 831 .name = "wm831x-epe", 832 }, 833 }; 834 835 static struct platform_driver * const drivers[] = { 836 &wm831x_buckv_driver, 837 &wm831x_buckp_driver, 838 &wm831x_boostp_driver, 839 &wm831x_epe_driver, 840 }; 841 842 static int __init wm831x_dcdc_init(void) 843 { 844 return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); 845 } 846 subsys_initcall(wm831x_dcdc_init); 847 848 static void __exit wm831x_dcdc_exit(void) 849 { 850 platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); 851 } 852 module_exit(wm831x_dcdc_exit); 853 854 /* Module information */ 855 MODULE_AUTHOR("Mark Brown"); 856 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 857 MODULE_LICENSE("GPL"); 858 MODULE_ALIAS("platform:wm831x-buckv"); 859 MODULE_ALIAS("platform:wm831x-buckp"); 860 MODULE_ALIAS("platform:wm831x-boostp"); 861 MODULE_ALIAS("platform:wm831x-epe"); 862