1 /* 2 * wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/bitops.h> 18 #include <linux/err.h> 19 #include <linux/i2c.h> 20 #include <linux/platform_device.h> 21 #include <linux/regulator/driver.h> 22 #include <linux/regulator/machine.h> 23 #include <linux/gpio.h> 24 #include <linux/slab.h> 25 26 #include <linux/mfd/wm831x/core.h> 27 #include <linux/mfd/wm831x/regulator.h> 28 #include <linux/mfd/wm831x/pdata.h> 29 30 #define WM831X_BUCKV_MAX_SELECTOR 0x68 31 #define WM831X_BUCKP_MAX_SELECTOR 0x66 32 33 #define WM831X_DCDC_MODE_FAST 0 34 #define WM831X_DCDC_MODE_NORMAL 1 35 #define WM831X_DCDC_MODE_IDLE 2 36 #define WM831X_DCDC_MODE_STANDBY 3 37 38 #define WM831X_DCDC_MAX_NAME 9 39 40 /* Register offsets in control block */ 41 #define WM831X_DCDC_CONTROL_1 0 42 #define WM831X_DCDC_CONTROL_2 1 43 #define WM831X_DCDC_ON_CONFIG 2 44 #define WM831X_DCDC_SLEEP_CONTROL 3 45 #define WM831X_DCDC_DVS_CONTROL 4 46 47 /* 48 * Shared 49 */ 50 51 struct wm831x_dcdc { 52 char name[WM831X_DCDC_MAX_NAME]; 53 char supply_name[WM831X_DCDC_MAX_NAME]; 54 struct regulator_desc desc; 55 int base; 56 struct wm831x *wm831x; 57 struct regulator_dev *regulator; 58 int dvs_gpio; 59 int dvs_gpio_state; 60 int on_vsel; 61 int dvs_vsel; 62 }; 63 64 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) 65 66 { 67 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 68 struct wm831x *wm831x = dcdc->wm831x; 69 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 70 int val; 71 72 val = wm831x_reg_read(wm831x, reg); 73 if (val < 0) 74 return val; 75 76 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; 77 78 switch (val) { 79 case WM831X_DCDC_MODE_FAST: 80 return REGULATOR_MODE_FAST; 81 case WM831X_DCDC_MODE_NORMAL: 82 return REGULATOR_MODE_NORMAL; 83 case WM831X_DCDC_MODE_STANDBY: 84 return REGULATOR_MODE_STANDBY; 85 case WM831X_DCDC_MODE_IDLE: 86 return REGULATOR_MODE_IDLE; 87 default: 88 BUG(); 89 return -EINVAL; 90 } 91 } 92 93 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 94 unsigned int mode) 95 { 96 int val; 97 98 switch (mode) { 99 case REGULATOR_MODE_FAST: 100 val = WM831X_DCDC_MODE_FAST; 101 break; 102 case REGULATOR_MODE_NORMAL: 103 val = WM831X_DCDC_MODE_NORMAL; 104 break; 105 case REGULATOR_MODE_STANDBY: 106 val = WM831X_DCDC_MODE_STANDBY; 107 break; 108 case REGULATOR_MODE_IDLE: 109 val = WM831X_DCDC_MODE_IDLE; 110 break; 111 default: 112 return -EINVAL; 113 } 114 115 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 116 val << WM831X_DC1_ON_MODE_SHIFT); 117 } 118 119 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 120 { 121 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 122 struct wm831x *wm831x = dcdc->wm831x; 123 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 124 125 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 126 } 127 128 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 129 unsigned int mode) 130 { 131 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 132 struct wm831x *wm831x = dcdc->wm831x; 133 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 134 135 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 136 } 137 138 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 139 { 140 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 141 struct wm831x *wm831x = dcdc->wm831x; 142 int ret; 143 144 /* First, check for errors */ 145 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 146 if (ret < 0) 147 return ret; 148 149 if (ret & (1 << rdev_get_id(rdev))) { 150 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 151 rdev_get_id(rdev) + 1); 152 return REGULATOR_STATUS_ERROR; 153 } 154 155 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 156 if (rdev_get_id(rdev) < 2) { 157 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 158 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 159 rdev_get_id(rdev) + 1); 160 return REGULATOR_STATUS_ERROR; 161 } 162 163 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 164 dev_dbg(wm831x->dev, "DCDC%d over current\n", 165 rdev_get_id(rdev) + 1); 166 return REGULATOR_STATUS_ERROR; 167 } 168 } 169 170 /* Is the regulator on? */ 171 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 172 if (ret < 0) 173 return ret; 174 if (!(ret & (1 << rdev_get_id(rdev)))) 175 return REGULATOR_STATUS_OFF; 176 177 /* TODO: When we handle hardware control modes so we can report the 178 * current mode. */ 179 return REGULATOR_STATUS_ON; 180 } 181 182 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 183 { 184 struct wm831x_dcdc *dcdc = data; 185 186 regulator_notifier_call_chain(dcdc->regulator, 187 REGULATOR_EVENT_UNDER_VOLTAGE, 188 NULL); 189 190 return IRQ_HANDLED; 191 } 192 193 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 194 { 195 struct wm831x_dcdc *dcdc = data; 196 197 regulator_notifier_call_chain(dcdc->regulator, 198 REGULATOR_EVENT_OVER_CURRENT, 199 NULL); 200 201 return IRQ_HANDLED; 202 } 203 204 /* 205 * BUCKV specifics 206 */ 207 208 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 209 unsigned selector) 210 { 211 if (selector <= 0x8) 212 return 600000; 213 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 214 return 600000 + ((selector - 0x8) * 12500); 215 return -EINVAL; 216 } 217 218 static int wm831x_buckv_map_voltage(struct regulator_dev *rdev, 219 int min_uV, int max_uV) 220 { 221 u16 vsel; 222 223 if (min_uV < 600000) 224 vsel = 0; 225 else if (min_uV <= 1800000) 226 vsel = DIV_ROUND_UP(min_uV - 600000, 12500) + 8; 227 else 228 return -EINVAL; 229 230 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 231 return -EINVAL; 232 233 return vsel; 234 } 235 236 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 237 { 238 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 239 240 if (state == dcdc->dvs_gpio_state) 241 return 0; 242 243 dcdc->dvs_gpio_state = state; 244 gpio_set_value(dcdc->dvs_gpio, state); 245 246 /* Should wait for DVS state change to be asserted if we have 247 * a GPIO for it, for now assume the device is configured 248 * for the fastest possible transition. 249 */ 250 251 return 0; 252 } 253 254 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev, 255 unsigned vsel) 256 { 257 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 258 struct wm831x *wm831x = dcdc->wm831x; 259 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 260 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 261 int ret; 262 263 /* If this value is already set then do a GPIO update if we can */ 264 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 265 return wm831x_buckv_set_dvs(rdev, 0); 266 267 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 268 return wm831x_buckv_set_dvs(rdev, 1); 269 270 /* Always set the ON status to the minimum voltage */ 271 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 272 if (ret < 0) 273 return ret; 274 dcdc->on_vsel = vsel; 275 276 if (!dcdc->dvs_gpio) 277 return ret; 278 279 /* Kick the voltage transition now */ 280 ret = wm831x_buckv_set_dvs(rdev, 0); 281 if (ret < 0) 282 return ret; 283 284 /* 285 * If this VSEL is higher than the last one we've seen then 286 * remember it as the DVS VSEL. This is optimised for CPUfreq 287 * usage where we want to get to the highest voltage very 288 * quickly. 289 */ 290 if (vsel > dcdc->dvs_vsel) { 291 ret = wm831x_set_bits(wm831x, dvs_reg, 292 WM831X_DC1_DVS_VSEL_MASK, 293 vsel); 294 if (ret == 0) 295 dcdc->dvs_vsel = vsel; 296 else 297 dev_warn(wm831x->dev, 298 "Failed to set DCDC DVS VSEL: %d\n", ret); 299 } 300 301 return 0; 302 } 303 304 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 305 int uV) 306 { 307 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 308 struct wm831x *wm831x = dcdc->wm831x; 309 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 310 int vsel; 311 312 vsel = wm831x_buckv_map_voltage(rdev, uV, uV); 313 if (vsel < 0) 314 return vsel; 315 316 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 317 } 318 319 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) 320 { 321 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 322 323 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 324 return dcdc->dvs_vsel; 325 else 326 return dcdc->on_vsel; 327 } 328 329 /* Current limit options */ 330 static u16 wm831x_dcdc_ilim[] = { 331 125, 250, 375, 500, 625, 750, 875, 1000 332 }; 333 334 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 335 int min_uA, int max_uA) 336 { 337 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 338 struct wm831x *wm831x = dcdc->wm831x; 339 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 340 int i; 341 342 for (i = ARRAY_SIZE(wm831x_dcdc_ilim) - 1; i >= 0; i--) { 343 if ((min_uA <= wm831x_dcdc_ilim[i]) && 344 (wm831x_dcdc_ilim[i] <= max_uA)) 345 return wm831x_set_bits(wm831x, reg, 346 WM831X_DC1_HC_THR_MASK, 347 i << WM831X_DC1_HC_THR_SHIFT); 348 } 349 350 return -EINVAL; 351 } 352 353 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 354 { 355 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 356 struct wm831x *wm831x = dcdc->wm831x; 357 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 358 int val; 359 360 val = wm831x_reg_read(wm831x, reg); 361 if (val < 0) 362 return val; 363 364 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT; 365 return wm831x_dcdc_ilim[val]; 366 } 367 368 static struct regulator_ops wm831x_buckv_ops = { 369 .set_voltage_sel = wm831x_buckv_set_voltage_sel, 370 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 371 .list_voltage = wm831x_buckv_list_voltage, 372 .map_voltage = wm831x_buckv_map_voltage, 373 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 374 .set_current_limit = wm831x_buckv_set_current_limit, 375 .get_current_limit = wm831x_buckv_get_current_limit, 376 377 .is_enabled = regulator_is_enabled_regmap, 378 .enable = regulator_enable_regmap, 379 .disable = regulator_disable_regmap, 380 .get_status = wm831x_dcdc_get_status, 381 .get_mode = wm831x_dcdc_get_mode, 382 .set_mode = wm831x_dcdc_set_mode, 383 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 384 }; 385 386 /* 387 * Set up DVS control. We just log errors since we can still run 388 * (with reduced performance) if we fail. 389 */ 390 static void wm831x_buckv_dvs_init(struct platform_device *pdev, 391 struct wm831x_dcdc *dcdc, 392 struct wm831x_buckv_pdata *pdata) 393 { 394 struct wm831x *wm831x = dcdc->wm831x; 395 int ret; 396 u16 ctrl; 397 398 if (!pdata || !pdata->dvs_gpio) 399 return; 400 401 /* gpiolib won't let us read the GPIO status so pick the higher 402 * of the two existing voltages so we take it as platform data. 403 */ 404 dcdc->dvs_gpio_state = pdata->dvs_init_state; 405 406 ret = devm_gpio_request_one(&pdev->dev, pdata->dvs_gpio, 407 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0, 408 "DCDC DVS"); 409 if (ret < 0) { 410 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 411 dcdc->name, ret); 412 return; 413 } 414 415 dcdc->dvs_gpio = pdata->dvs_gpio; 416 417 switch (pdata->dvs_control_src) { 418 case 1: 419 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 420 break; 421 case 2: 422 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 423 break; 424 default: 425 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 426 pdata->dvs_control_src, dcdc->name); 427 return; 428 } 429 430 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 431 * to make bootstrapping a bit smoother. 432 */ 433 if (!dcdc->dvs_vsel) { 434 ret = wm831x_set_bits(wm831x, 435 dcdc->base + WM831X_DCDC_DVS_CONTROL, 436 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 437 if (ret == 0) 438 dcdc->dvs_vsel = dcdc->on_vsel; 439 else 440 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 441 ret); 442 } 443 444 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 445 WM831X_DC1_DVS_SRC_MASK, ctrl); 446 if (ret < 0) { 447 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 448 dcdc->name, ret); 449 } 450 } 451 452 static int wm831x_buckv_probe(struct platform_device *pdev) 453 { 454 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 455 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 456 struct regulator_config config = { }; 457 int id; 458 struct wm831x_dcdc *dcdc; 459 struct resource *res; 460 int ret, irq; 461 462 if (pdata && pdata->wm831x_num) 463 id = (pdata->wm831x_num * 10) + 1; 464 else 465 id = 0; 466 id = pdev->id - id; 467 468 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 469 470 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 471 GFP_KERNEL); 472 if (dcdc == NULL) { 473 dev_err(&pdev->dev, "Unable to allocate private data\n"); 474 return -ENOMEM; 475 } 476 477 dcdc->wm831x = wm831x; 478 479 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 480 if (res == NULL) { 481 dev_err(&pdev->dev, "No REG resource\n"); 482 ret = -EINVAL; 483 goto err; 484 } 485 dcdc->base = res->start; 486 487 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 488 dcdc->desc.name = dcdc->name; 489 490 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 491 "DC%dVDD", id + 1); 492 dcdc->desc.supply_name = dcdc->supply_name; 493 494 dcdc->desc.id = id; 495 dcdc->desc.type = REGULATOR_VOLTAGE; 496 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 497 dcdc->desc.ops = &wm831x_buckv_ops; 498 dcdc->desc.owner = THIS_MODULE; 499 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 500 dcdc->desc.enable_mask = 1 << id; 501 502 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 503 if (ret < 0) { 504 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 505 goto err; 506 } 507 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 508 509 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 510 if (ret < 0) { 511 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 512 goto err; 513 } 514 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 515 516 if (pdata && pdata->dcdc[id]) 517 wm831x_buckv_dvs_init(pdev, dcdc, 518 pdata->dcdc[id]->driver_data); 519 520 config.dev = pdev->dev.parent; 521 if (pdata) 522 config.init_data = pdata->dcdc[id]; 523 config.driver_data = dcdc; 524 config.regmap = wm831x->regmap; 525 526 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 527 &config); 528 if (IS_ERR(dcdc->regulator)) { 529 ret = PTR_ERR(dcdc->regulator); 530 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 531 id + 1, ret); 532 goto err; 533 } 534 535 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 536 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 537 wm831x_dcdc_uv_irq, 538 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 539 if (ret != 0) { 540 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 541 irq, ret); 542 goto err; 543 } 544 545 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")); 546 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 547 wm831x_dcdc_oc_irq, 548 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 549 if (ret != 0) { 550 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 551 irq, ret); 552 goto err; 553 } 554 555 platform_set_drvdata(pdev, dcdc); 556 557 return 0; 558 559 err: 560 return ret; 561 } 562 563 static struct platform_driver wm831x_buckv_driver = { 564 .probe = wm831x_buckv_probe, 565 .driver = { 566 .name = "wm831x-buckv", 567 .owner = THIS_MODULE, 568 }, 569 }; 570 571 /* 572 * BUCKP specifics 573 */ 574 575 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV) 576 { 577 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 578 struct wm831x *wm831x = dcdc->wm831x; 579 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 580 int sel; 581 582 sel = regulator_map_voltage_linear(rdev, uV, uV); 583 if (sel < 0) 584 return sel; 585 586 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel); 587 } 588 589 static struct regulator_ops wm831x_buckp_ops = { 590 .set_voltage_sel = regulator_set_voltage_sel_regmap, 591 .get_voltage_sel = regulator_get_voltage_sel_regmap, 592 .list_voltage = regulator_list_voltage_linear, 593 .map_voltage = regulator_map_voltage_linear, 594 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 595 596 .is_enabled = regulator_is_enabled_regmap, 597 .enable = regulator_enable_regmap, 598 .disable = regulator_disable_regmap, 599 .get_status = wm831x_dcdc_get_status, 600 .get_mode = wm831x_dcdc_get_mode, 601 .set_mode = wm831x_dcdc_set_mode, 602 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 603 }; 604 605 static int wm831x_buckp_probe(struct platform_device *pdev) 606 { 607 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 608 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 609 struct regulator_config config = { }; 610 int id; 611 struct wm831x_dcdc *dcdc; 612 struct resource *res; 613 int ret, irq; 614 615 if (pdata && pdata->wm831x_num) 616 id = (pdata->wm831x_num * 10) + 1; 617 else 618 id = 0; 619 id = pdev->id - id; 620 621 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 622 623 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 624 GFP_KERNEL); 625 if (dcdc == NULL) { 626 dev_err(&pdev->dev, "Unable to allocate private data\n"); 627 return -ENOMEM; 628 } 629 630 dcdc->wm831x = wm831x; 631 632 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 633 if (res == NULL) { 634 dev_err(&pdev->dev, "No REG resource\n"); 635 ret = -EINVAL; 636 goto err; 637 } 638 dcdc->base = res->start; 639 640 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 641 dcdc->desc.name = dcdc->name; 642 643 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 644 "DC%dVDD", id + 1); 645 dcdc->desc.supply_name = dcdc->supply_name; 646 647 dcdc->desc.id = id; 648 dcdc->desc.type = REGULATOR_VOLTAGE; 649 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 650 dcdc->desc.ops = &wm831x_buckp_ops; 651 dcdc->desc.owner = THIS_MODULE; 652 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 653 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK; 654 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 655 dcdc->desc.enable_mask = 1 << id; 656 dcdc->desc.min_uV = 850000; 657 dcdc->desc.uV_step = 25000; 658 659 config.dev = pdev->dev.parent; 660 if (pdata) 661 config.init_data = pdata->dcdc[id]; 662 config.driver_data = dcdc; 663 config.regmap = wm831x->regmap; 664 665 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 666 &config); 667 if (IS_ERR(dcdc->regulator)) { 668 ret = PTR_ERR(dcdc->regulator); 669 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 670 id + 1, ret); 671 goto err; 672 } 673 674 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 675 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 676 wm831x_dcdc_uv_irq, 677 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 678 if (ret != 0) { 679 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 680 irq, ret); 681 goto err; 682 } 683 684 platform_set_drvdata(pdev, dcdc); 685 686 return 0; 687 688 err: 689 return ret; 690 } 691 692 static struct platform_driver wm831x_buckp_driver = { 693 .probe = wm831x_buckp_probe, 694 .driver = { 695 .name = "wm831x-buckp", 696 .owner = THIS_MODULE, 697 }, 698 }; 699 700 /* 701 * DCDC boost convertors 702 */ 703 704 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 705 { 706 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 707 struct wm831x *wm831x = dcdc->wm831x; 708 int ret; 709 710 /* First, check for errors */ 711 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 712 if (ret < 0) 713 return ret; 714 715 if (ret & (1 << rdev_get_id(rdev))) { 716 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 717 rdev_get_id(rdev) + 1); 718 return REGULATOR_STATUS_ERROR; 719 } 720 721 /* Is the regulator on? */ 722 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 723 if (ret < 0) 724 return ret; 725 if (ret & (1 << rdev_get_id(rdev))) 726 return REGULATOR_STATUS_ON; 727 else 728 return REGULATOR_STATUS_OFF; 729 } 730 731 static struct regulator_ops wm831x_boostp_ops = { 732 .get_status = wm831x_boostp_get_status, 733 734 .is_enabled = regulator_is_enabled_regmap, 735 .enable = regulator_enable_regmap, 736 .disable = regulator_disable_regmap, 737 }; 738 739 static int wm831x_boostp_probe(struct platform_device *pdev) 740 { 741 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 742 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 743 struct regulator_config config = { }; 744 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 745 struct wm831x_dcdc *dcdc; 746 struct resource *res; 747 int ret, irq; 748 749 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 750 751 if (pdata == NULL || pdata->dcdc[id] == NULL) 752 return -ENODEV; 753 754 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 755 if (dcdc == NULL) { 756 dev_err(&pdev->dev, "Unable to allocate private data\n"); 757 return -ENOMEM; 758 } 759 760 dcdc->wm831x = wm831x; 761 762 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 763 if (res == NULL) { 764 dev_err(&pdev->dev, "No REG resource\n"); 765 return -EINVAL; 766 } 767 dcdc->base = res->start; 768 769 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 770 dcdc->desc.name = dcdc->name; 771 dcdc->desc.id = id; 772 dcdc->desc.type = REGULATOR_VOLTAGE; 773 dcdc->desc.ops = &wm831x_boostp_ops; 774 dcdc->desc.owner = THIS_MODULE; 775 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 776 dcdc->desc.enable_mask = 1 << id; 777 778 config.dev = pdev->dev.parent; 779 if (pdata) 780 config.init_data = pdata->dcdc[id]; 781 config.driver_data = dcdc; 782 config.regmap = wm831x->regmap; 783 784 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 785 &config); 786 if (IS_ERR(dcdc->regulator)) { 787 ret = PTR_ERR(dcdc->regulator); 788 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 789 id + 1, ret); 790 return ret; 791 } 792 793 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 794 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, 795 wm831x_dcdc_uv_irq, 796 IRQF_TRIGGER_RISING, dcdc->name, 797 dcdc); 798 if (ret != 0) { 799 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 800 irq, ret); 801 return ret; 802 } 803 804 platform_set_drvdata(pdev, dcdc); 805 806 return 0; 807 } 808 809 static struct platform_driver wm831x_boostp_driver = { 810 .probe = wm831x_boostp_probe, 811 .driver = { 812 .name = "wm831x-boostp", 813 .owner = THIS_MODULE, 814 }, 815 }; 816 817 /* 818 * External Power Enable 819 * 820 * These aren't actually DCDCs but look like them in hardware so share 821 * code. 822 */ 823 824 #define WM831X_EPE_BASE 6 825 826 static struct regulator_ops wm831x_epe_ops = { 827 .is_enabled = regulator_is_enabled_regmap, 828 .enable = regulator_enable_regmap, 829 .disable = regulator_disable_regmap, 830 .get_status = wm831x_dcdc_get_status, 831 }; 832 833 static int wm831x_epe_probe(struct platform_device *pdev) 834 { 835 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 836 struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev); 837 struct regulator_config config = { }; 838 int id = pdev->id % ARRAY_SIZE(pdata->epe); 839 struct wm831x_dcdc *dcdc; 840 int ret; 841 842 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 843 844 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 845 if (dcdc == NULL) { 846 dev_err(&pdev->dev, "Unable to allocate private data\n"); 847 return -ENOMEM; 848 } 849 850 dcdc->wm831x = wm831x; 851 852 /* For current parts this is correct; probably need to revisit 853 * in future. 854 */ 855 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 856 dcdc->desc.name = dcdc->name; 857 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 858 dcdc->desc.ops = &wm831x_epe_ops; 859 dcdc->desc.type = REGULATOR_VOLTAGE; 860 dcdc->desc.owner = THIS_MODULE; 861 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 862 dcdc->desc.enable_mask = 1 << dcdc->desc.id; 863 864 config.dev = pdev->dev.parent; 865 if (pdata) 866 config.init_data = pdata->epe[id]; 867 config.driver_data = dcdc; 868 config.regmap = wm831x->regmap; 869 870 dcdc->regulator = devm_regulator_register(&pdev->dev, &dcdc->desc, 871 &config); 872 if (IS_ERR(dcdc->regulator)) { 873 ret = PTR_ERR(dcdc->regulator); 874 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 875 id + 1, ret); 876 goto err; 877 } 878 879 platform_set_drvdata(pdev, dcdc); 880 881 return 0; 882 883 err: 884 return ret; 885 } 886 887 static struct platform_driver wm831x_epe_driver = { 888 .probe = wm831x_epe_probe, 889 .driver = { 890 .name = "wm831x-epe", 891 .owner = THIS_MODULE, 892 }, 893 }; 894 895 static int __init wm831x_dcdc_init(void) 896 { 897 int ret; 898 ret = platform_driver_register(&wm831x_buckv_driver); 899 if (ret != 0) 900 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 901 902 ret = platform_driver_register(&wm831x_buckp_driver); 903 if (ret != 0) 904 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 905 906 ret = platform_driver_register(&wm831x_boostp_driver); 907 if (ret != 0) 908 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 909 910 ret = platform_driver_register(&wm831x_epe_driver); 911 if (ret != 0) 912 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 913 914 return 0; 915 } 916 subsys_initcall(wm831x_dcdc_init); 917 918 static void __exit wm831x_dcdc_exit(void) 919 { 920 platform_driver_unregister(&wm831x_epe_driver); 921 platform_driver_unregister(&wm831x_boostp_driver); 922 platform_driver_unregister(&wm831x_buckp_driver); 923 platform_driver_unregister(&wm831x_buckv_driver); 924 } 925 module_exit(wm831x_dcdc_exit); 926 927 /* Module information */ 928 MODULE_AUTHOR("Mark Brown"); 929 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 930 MODULE_LICENSE("GPL"); 931 MODULE_ALIAS("platform:wm831x-buckv"); 932 MODULE_ALIAS("platform:wm831x-buckp"); 933 MODULE_ALIAS("platform:wm831x-boostp"); 934 MODULE_ALIAS("platform:wm831x-epe"); 935