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 wm831x_dcdc *dcdc, 391 struct wm831x_buckv_pdata *pdata) 392 { 393 struct wm831x *wm831x = dcdc->wm831x; 394 int ret; 395 u16 ctrl; 396 397 if (!pdata || !pdata->dvs_gpio) 398 return; 399 400 /* gpiolib won't let us read the GPIO status so pick the higher 401 * of the two existing voltages so we take it as platform data. 402 */ 403 dcdc->dvs_gpio_state = pdata->dvs_init_state; 404 405 ret = gpio_request_one(pdata->dvs_gpio, 406 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0, 407 "DCDC DVS"); 408 if (ret < 0) { 409 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 410 dcdc->name, ret); 411 return; 412 } 413 414 dcdc->dvs_gpio = pdata->dvs_gpio; 415 416 switch (pdata->dvs_control_src) { 417 case 1: 418 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 419 break; 420 case 2: 421 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 422 break; 423 default: 424 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 425 pdata->dvs_control_src, dcdc->name); 426 return; 427 } 428 429 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 430 * to make bootstrapping a bit smoother. 431 */ 432 if (!dcdc->dvs_vsel) { 433 ret = wm831x_set_bits(wm831x, 434 dcdc->base + WM831X_DCDC_DVS_CONTROL, 435 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 436 if (ret == 0) 437 dcdc->dvs_vsel = dcdc->on_vsel; 438 else 439 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 440 ret); 441 } 442 443 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 444 WM831X_DC1_DVS_SRC_MASK, ctrl); 445 if (ret < 0) { 446 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 447 dcdc->name, ret); 448 } 449 } 450 451 static int wm831x_buckv_probe(struct platform_device *pdev) 452 { 453 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 454 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 455 struct regulator_config config = { }; 456 int id; 457 struct wm831x_dcdc *dcdc; 458 struct resource *res; 459 int ret, irq; 460 461 if (pdata && pdata->wm831x_num) 462 id = (pdata->wm831x_num * 10) + 1; 463 else 464 id = 0; 465 id = pdev->id - id; 466 467 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 468 469 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 470 GFP_KERNEL); 471 if (dcdc == NULL) { 472 dev_err(&pdev->dev, "Unable to allocate private data\n"); 473 return -ENOMEM; 474 } 475 476 dcdc->wm831x = wm831x; 477 478 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 479 if (res == NULL) { 480 dev_err(&pdev->dev, "No REG resource\n"); 481 ret = -EINVAL; 482 goto err; 483 } 484 dcdc->base = res->start; 485 486 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 487 dcdc->desc.name = dcdc->name; 488 489 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 490 "DC%dVDD", id + 1); 491 dcdc->desc.supply_name = dcdc->supply_name; 492 493 dcdc->desc.id = id; 494 dcdc->desc.type = REGULATOR_VOLTAGE; 495 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 496 dcdc->desc.ops = &wm831x_buckv_ops; 497 dcdc->desc.owner = THIS_MODULE; 498 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 499 dcdc->desc.enable_mask = 1 << id; 500 501 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 502 if (ret < 0) { 503 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 504 goto err; 505 } 506 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 507 508 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 509 if (ret < 0) { 510 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 511 goto err; 512 } 513 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 514 515 if (pdata && pdata->dcdc[id]) 516 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 517 518 config.dev = pdev->dev.parent; 519 if (pdata) 520 config.init_data = pdata->dcdc[id]; 521 config.driver_data = dcdc; 522 config.regmap = wm831x->regmap; 523 524 dcdc->regulator = regulator_register(&dcdc->desc, &config); 525 if (IS_ERR(dcdc->regulator)) { 526 ret = PTR_ERR(dcdc->regulator); 527 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 528 id + 1, ret); 529 goto err; 530 } 531 532 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 533 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 534 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 535 if (ret != 0) { 536 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 537 irq, ret); 538 goto err_regulator; 539 } 540 541 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")); 542 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 543 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 544 if (ret != 0) { 545 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 546 irq, ret); 547 goto err_uv; 548 } 549 550 platform_set_drvdata(pdev, dcdc); 551 552 return 0; 553 554 err_uv: 555 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")), 556 dcdc); 557 err_regulator: 558 regulator_unregister(dcdc->regulator); 559 err: 560 if (dcdc->dvs_gpio) 561 gpio_free(dcdc->dvs_gpio); 562 return ret; 563 } 564 565 static int wm831x_buckv_remove(struct platform_device *pdev) 566 { 567 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 568 struct wm831x *wm831x = dcdc->wm831x; 569 570 platform_set_drvdata(pdev, NULL); 571 572 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")), 573 dcdc); 574 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")), 575 dcdc); 576 regulator_unregister(dcdc->regulator); 577 if (dcdc->dvs_gpio) 578 gpio_free(dcdc->dvs_gpio); 579 580 return 0; 581 } 582 583 static struct platform_driver wm831x_buckv_driver = { 584 .probe = wm831x_buckv_probe, 585 .remove = wm831x_buckv_remove, 586 .driver = { 587 .name = "wm831x-buckv", 588 .owner = THIS_MODULE, 589 }, 590 }; 591 592 /* 593 * BUCKP specifics 594 */ 595 596 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV) 597 { 598 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 599 struct wm831x *wm831x = dcdc->wm831x; 600 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 601 int sel; 602 603 sel = regulator_map_voltage_linear(rdev, uV, uV); 604 if (sel < 0) 605 return sel; 606 607 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel); 608 } 609 610 static struct regulator_ops wm831x_buckp_ops = { 611 .set_voltage_sel = regulator_set_voltage_sel_regmap, 612 .get_voltage_sel = regulator_get_voltage_sel_regmap, 613 .list_voltage = regulator_list_voltage_linear, 614 .map_voltage = regulator_map_voltage_linear, 615 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 616 617 .is_enabled = regulator_is_enabled_regmap, 618 .enable = regulator_enable_regmap, 619 .disable = regulator_disable_regmap, 620 .get_status = wm831x_dcdc_get_status, 621 .get_mode = wm831x_dcdc_get_mode, 622 .set_mode = wm831x_dcdc_set_mode, 623 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 624 }; 625 626 static int wm831x_buckp_probe(struct platform_device *pdev) 627 { 628 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 629 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 630 struct regulator_config config = { }; 631 int id; 632 struct wm831x_dcdc *dcdc; 633 struct resource *res; 634 int ret, irq; 635 636 if (pdata && pdata->wm831x_num) 637 id = (pdata->wm831x_num * 10) + 1; 638 else 639 id = 0; 640 id = pdev->id - id; 641 642 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 643 644 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 645 GFP_KERNEL); 646 if (dcdc == NULL) { 647 dev_err(&pdev->dev, "Unable to allocate private data\n"); 648 return -ENOMEM; 649 } 650 651 dcdc->wm831x = wm831x; 652 653 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 654 if (res == NULL) { 655 dev_err(&pdev->dev, "No REG resource\n"); 656 ret = -EINVAL; 657 goto err; 658 } 659 dcdc->base = res->start; 660 661 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 662 dcdc->desc.name = dcdc->name; 663 664 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 665 "DC%dVDD", id + 1); 666 dcdc->desc.supply_name = dcdc->supply_name; 667 668 dcdc->desc.id = id; 669 dcdc->desc.type = REGULATOR_VOLTAGE; 670 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 671 dcdc->desc.ops = &wm831x_buckp_ops; 672 dcdc->desc.owner = THIS_MODULE; 673 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 674 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK; 675 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 676 dcdc->desc.enable_mask = 1 << id; 677 dcdc->desc.min_uV = 850000; 678 dcdc->desc.uV_step = 25000; 679 680 config.dev = pdev->dev.parent; 681 if (pdata) 682 config.init_data = pdata->dcdc[id]; 683 config.driver_data = dcdc; 684 config.regmap = wm831x->regmap; 685 686 dcdc->regulator = regulator_register(&dcdc->desc, &config); 687 if (IS_ERR(dcdc->regulator)) { 688 ret = PTR_ERR(dcdc->regulator); 689 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 690 id + 1, ret); 691 goto err; 692 } 693 694 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 695 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 696 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 697 if (ret != 0) { 698 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 699 irq, ret); 700 goto err_regulator; 701 } 702 703 platform_set_drvdata(pdev, dcdc); 704 705 return 0; 706 707 err_regulator: 708 regulator_unregister(dcdc->regulator); 709 err: 710 return ret; 711 } 712 713 static int wm831x_buckp_remove(struct platform_device *pdev) 714 { 715 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 716 717 platform_set_drvdata(pdev, NULL); 718 719 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")), 720 dcdc); 721 regulator_unregister(dcdc->regulator); 722 723 return 0; 724 } 725 726 static struct platform_driver wm831x_buckp_driver = { 727 .probe = wm831x_buckp_probe, 728 .remove = wm831x_buckp_remove, 729 .driver = { 730 .name = "wm831x-buckp", 731 .owner = THIS_MODULE, 732 }, 733 }; 734 735 /* 736 * DCDC boost convertors 737 */ 738 739 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 740 { 741 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 742 struct wm831x *wm831x = dcdc->wm831x; 743 int ret; 744 745 /* First, check for errors */ 746 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 747 if (ret < 0) 748 return ret; 749 750 if (ret & (1 << rdev_get_id(rdev))) { 751 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 752 rdev_get_id(rdev) + 1); 753 return REGULATOR_STATUS_ERROR; 754 } 755 756 /* Is the regulator on? */ 757 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 758 if (ret < 0) 759 return ret; 760 if (ret & (1 << rdev_get_id(rdev))) 761 return REGULATOR_STATUS_ON; 762 else 763 return REGULATOR_STATUS_OFF; 764 } 765 766 static struct regulator_ops wm831x_boostp_ops = { 767 .get_status = wm831x_boostp_get_status, 768 769 .is_enabled = regulator_is_enabled_regmap, 770 .enable = regulator_enable_regmap, 771 .disable = regulator_disable_regmap, 772 }; 773 774 static int wm831x_boostp_probe(struct platform_device *pdev) 775 { 776 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 777 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 778 struct regulator_config config = { }; 779 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 780 struct wm831x_dcdc *dcdc; 781 struct resource *res; 782 int ret, irq; 783 784 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 785 786 if (pdata == NULL || pdata->dcdc[id] == NULL) 787 return -ENODEV; 788 789 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 790 if (dcdc == NULL) { 791 dev_err(&pdev->dev, "Unable to allocate private data\n"); 792 return -ENOMEM; 793 } 794 795 dcdc->wm831x = wm831x; 796 797 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 798 if (res == NULL) { 799 dev_err(&pdev->dev, "No REG resource\n"); 800 ret = -EINVAL; 801 goto err; 802 } 803 dcdc->base = res->start; 804 805 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 806 dcdc->desc.name = dcdc->name; 807 dcdc->desc.id = id; 808 dcdc->desc.type = REGULATOR_VOLTAGE; 809 dcdc->desc.ops = &wm831x_boostp_ops; 810 dcdc->desc.owner = THIS_MODULE; 811 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 812 dcdc->desc.enable_mask = 1 << id; 813 814 config.dev = pdev->dev.parent; 815 if (pdata) 816 config.init_data = pdata->dcdc[id]; 817 config.driver_data = dcdc; 818 config.regmap = wm831x->regmap; 819 820 dcdc->regulator = regulator_register(&dcdc->desc, &config); 821 if (IS_ERR(dcdc->regulator)) { 822 ret = PTR_ERR(dcdc->regulator); 823 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 824 id + 1, ret); 825 goto err; 826 } 827 828 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 829 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 830 IRQF_TRIGGER_RISING, dcdc->name, 831 dcdc); 832 if (ret != 0) { 833 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 834 irq, ret); 835 goto err_regulator; 836 } 837 838 platform_set_drvdata(pdev, dcdc); 839 840 return 0; 841 842 err_regulator: 843 regulator_unregister(dcdc->regulator); 844 err: 845 return ret; 846 } 847 848 static int wm831x_boostp_remove(struct platform_device *pdev) 849 { 850 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 851 852 platform_set_drvdata(pdev, NULL); 853 854 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")), 855 dcdc); 856 regulator_unregister(dcdc->regulator); 857 858 return 0; 859 } 860 861 static struct platform_driver wm831x_boostp_driver = { 862 .probe = wm831x_boostp_probe, 863 .remove = wm831x_boostp_remove, 864 .driver = { 865 .name = "wm831x-boostp", 866 .owner = THIS_MODULE, 867 }, 868 }; 869 870 /* 871 * External Power Enable 872 * 873 * These aren't actually DCDCs but look like them in hardware so share 874 * code. 875 */ 876 877 #define WM831X_EPE_BASE 6 878 879 static struct regulator_ops wm831x_epe_ops = { 880 .is_enabled = regulator_is_enabled_regmap, 881 .enable = regulator_enable_regmap, 882 .disable = regulator_disable_regmap, 883 .get_status = wm831x_dcdc_get_status, 884 }; 885 886 static int wm831x_epe_probe(struct platform_device *pdev) 887 { 888 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 889 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 890 struct regulator_config config = { }; 891 int id = pdev->id % ARRAY_SIZE(pdata->epe); 892 struct wm831x_dcdc *dcdc; 893 int ret; 894 895 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 896 897 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 898 if (dcdc == NULL) { 899 dev_err(&pdev->dev, "Unable to allocate private data\n"); 900 return -ENOMEM; 901 } 902 903 dcdc->wm831x = wm831x; 904 905 /* For current parts this is correct; probably need to revisit 906 * in future. 907 */ 908 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 909 dcdc->desc.name = dcdc->name; 910 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 911 dcdc->desc.ops = &wm831x_epe_ops; 912 dcdc->desc.type = REGULATOR_VOLTAGE; 913 dcdc->desc.owner = THIS_MODULE; 914 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 915 dcdc->desc.enable_mask = 1 << dcdc->desc.id; 916 917 config.dev = pdev->dev.parent; 918 if (pdata) 919 config.init_data = pdata->epe[id]; 920 config.driver_data = dcdc; 921 config.regmap = wm831x->regmap; 922 923 dcdc->regulator = regulator_register(&dcdc->desc, &config); 924 if (IS_ERR(dcdc->regulator)) { 925 ret = PTR_ERR(dcdc->regulator); 926 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 927 id + 1, ret); 928 goto err; 929 } 930 931 platform_set_drvdata(pdev, dcdc); 932 933 return 0; 934 935 err: 936 return ret; 937 } 938 939 static int wm831x_epe_remove(struct platform_device *pdev) 940 { 941 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 942 943 platform_set_drvdata(pdev, NULL); 944 regulator_unregister(dcdc->regulator); 945 946 return 0; 947 } 948 949 static struct platform_driver wm831x_epe_driver = { 950 .probe = wm831x_epe_probe, 951 .remove = wm831x_epe_remove, 952 .driver = { 953 .name = "wm831x-epe", 954 .owner = THIS_MODULE, 955 }, 956 }; 957 958 static int __init wm831x_dcdc_init(void) 959 { 960 int ret; 961 ret = platform_driver_register(&wm831x_buckv_driver); 962 if (ret != 0) 963 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 964 965 ret = platform_driver_register(&wm831x_buckp_driver); 966 if (ret != 0) 967 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 968 969 ret = platform_driver_register(&wm831x_boostp_driver); 970 if (ret != 0) 971 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 972 973 ret = platform_driver_register(&wm831x_epe_driver); 974 if (ret != 0) 975 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 976 977 return 0; 978 } 979 subsys_initcall(wm831x_dcdc_init); 980 981 static void __exit wm831x_dcdc_exit(void) 982 { 983 platform_driver_unregister(&wm831x_epe_driver); 984 platform_driver_unregister(&wm831x_boostp_driver); 985 platform_driver_unregister(&wm831x_buckp_driver); 986 platform_driver_unregister(&wm831x_buckv_driver); 987 } 988 module_exit(wm831x_dcdc_exit); 989 990 /* Module information */ 991 MODULE_AUTHOR("Mark Brown"); 992 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 993 MODULE_LICENSE("GPL"); 994 MODULE_ALIAS("platform:wm831x-buckv"); 995 MODULE_ALIAS("platform:wm831x-buckp"); 996 MODULE_ALIAS("platform:wm831x-boostp"); 997 MODULE_ALIAS("platform:wm831x-epe"); 998