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 6 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 51struct wm831x_dcdc { 52 char name[WM831X_DCDC_MAX_NAME]; 53 struct regulator_desc desc; 54 int base; 55 struct wm831x *wm831x; 56 struct regulator_dev *regulator; 57 int dvs_gpio; 58 int dvs_gpio_state; 59 int on_vsel; 60 int dvs_vsel; 61}; 62 63static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev) 64{ 65 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 66 struct wm831x *wm831x = dcdc->wm831x; 67 int mask = 1 << rdev_get_id(rdev); 68 int reg; 69 70 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE); 71 if (reg < 0) 72 return reg; 73 74 if (reg & mask) 75 return 1; 76 else 77 return 0; 78} 79 80static int wm831x_dcdc_enable(struct regulator_dev *rdev) 81{ 82 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 83 struct wm831x *wm831x = dcdc->wm831x; 84 int mask = 1 << rdev_get_id(rdev); 85 86 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask); 87} 88 89static int wm831x_dcdc_disable(struct regulator_dev *rdev) 90{ 91 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 92 struct wm831x *wm831x = dcdc->wm831x; 93 int mask = 1 << rdev_get_id(rdev); 94 95 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0); 96} 97 98static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) 99 100{ 101 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 102 struct wm831x *wm831x = dcdc->wm831x; 103 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 104 int val; 105 106 val = wm831x_reg_read(wm831x, reg); 107 if (val < 0) 108 return val; 109 110 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; 111 112 switch (val) { 113 case WM831X_DCDC_MODE_FAST: 114 return REGULATOR_MODE_FAST; 115 case WM831X_DCDC_MODE_NORMAL: 116 return REGULATOR_MODE_NORMAL; 117 case WM831X_DCDC_MODE_STANDBY: 118 return REGULATOR_MODE_STANDBY; 119 case WM831X_DCDC_MODE_IDLE: 120 return REGULATOR_MODE_IDLE; 121 default: 122 BUG(); 123 } 124} 125 126static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 127 unsigned int mode) 128{ 129 int val; 130 131 switch (mode) { 132 case REGULATOR_MODE_FAST: 133 val = WM831X_DCDC_MODE_FAST; 134 break; 135 case REGULATOR_MODE_NORMAL: 136 val = WM831X_DCDC_MODE_NORMAL; 137 break; 138 case REGULATOR_MODE_STANDBY: 139 val = WM831X_DCDC_MODE_STANDBY; 140 break; 141 case REGULATOR_MODE_IDLE: 142 val = WM831X_DCDC_MODE_IDLE; 143 break; 144 default: 145 return -EINVAL; 146 } 147 148 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 149 val << WM831X_DC1_ON_MODE_SHIFT); 150} 151 152static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 153{ 154 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 155 struct wm831x *wm831x = dcdc->wm831x; 156 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 157 158 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 159} 160 161static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 162 unsigned int mode) 163{ 164 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 165 struct wm831x *wm831x = dcdc->wm831x; 166 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 167 168 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 169} 170 171static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 172{ 173 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 174 struct wm831x *wm831x = dcdc->wm831x; 175 int ret; 176 177 /* First, check for errors */ 178 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 179 if (ret < 0) 180 return ret; 181 182 if (ret & (1 << rdev_get_id(rdev))) { 183 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 184 rdev_get_id(rdev) + 1); 185 return REGULATOR_STATUS_ERROR; 186 } 187 188 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 189 if (rdev_get_id(rdev) < 2) { 190 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 191 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 192 rdev_get_id(rdev) + 1); 193 return REGULATOR_STATUS_ERROR; 194 } 195 196 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 197 dev_dbg(wm831x->dev, "DCDC%d over current\n", 198 rdev_get_id(rdev) + 1); 199 return REGULATOR_STATUS_ERROR; 200 } 201 } 202 203 /* Is the regulator on? */ 204 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 205 if (ret < 0) 206 return ret; 207 if (!(ret & (1 << rdev_get_id(rdev)))) 208 return REGULATOR_STATUS_OFF; 209 210 /* TODO: When we handle hardware control modes so we can report the 211 * current mode. */ 212 return REGULATOR_STATUS_ON; 213} 214 215static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 216{ 217 struct wm831x_dcdc *dcdc = data; 218 219 regulator_notifier_call_chain(dcdc->regulator, 220 REGULATOR_EVENT_UNDER_VOLTAGE, 221 NULL); 222 223 return IRQ_HANDLED; 224} 225 226static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 227{ 228 struct wm831x_dcdc *dcdc = data; 229 230 regulator_notifier_call_chain(dcdc->regulator, 231 REGULATOR_EVENT_OVER_CURRENT, 232 NULL); 233 234 return IRQ_HANDLED; 235} 236 237/* 238 * BUCKV specifics 239 */ 240 241static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 242 unsigned selector) 243{ 244 if (selector <= 0x8) 245 return 600000; 246 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 247 return 600000 + ((selector - 0x8) * 12500); 248 return -EINVAL; 249} 250 251static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev, 252 int min_uV, int max_uV) 253{ 254 u16 vsel; 255 256 if (min_uV < 600000) 257 vsel = 0; 258 else if (min_uV <= 1800000) 259 vsel = ((min_uV - 600000) / 12500) + 8; 260 else 261 return -EINVAL; 262 263 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 264 return -EINVAL; 265 266 return vsel; 267} 268 269static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev, 270 int min_uV, int max_uV) 271{ 272 u16 vsel; 273 274 if (max_uV < 600000 || max_uV > 1800000) 275 return -EINVAL; 276 277 vsel = ((max_uV - 600000) / 12500) + 8; 278 279 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV || 280 wm831x_buckv_list_voltage(rdev, vsel) < max_uV) 281 return -EINVAL; 282 283 return vsel; 284} 285 286static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 287{ 288 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 289 290 if (state == dcdc->dvs_gpio_state) 291 return 0; 292 293 dcdc->dvs_gpio_state = state; 294 gpio_set_value(dcdc->dvs_gpio, state); 295 296 /* Should wait for DVS state change to be asserted if we have 297 * a GPIO for it, for now assume the device is configured 298 * for the fastest possible transition. 299 */ 300 301 return 0; 302} 303 304static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, 305 int min_uV, int max_uV) 306{ 307 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 308 struct wm831x *wm831x = dcdc->wm831x; 309 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 310 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 311 int vsel, ret; 312 313 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV); 314 if (vsel < 0) 315 return vsel; 316 317 /* If this value is already set then do a GPIO update if we can */ 318 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 319 return wm831x_buckv_set_dvs(rdev, 0); 320 321 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 322 return wm831x_buckv_set_dvs(rdev, 1); 323 324 /* Always set the ON status to the minimum voltage */ 325 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 326 if (ret < 0) 327 return ret; 328 dcdc->on_vsel = vsel; 329 330 if (!dcdc->dvs_gpio) 331 return ret; 332 333 /* Kick the voltage transition now */ 334 ret = wm831x_buckv_set_dvs(rdev, 0); 335 if (ret < 0) 336 return ret; 337 338 /* Set the high voltage as the DVS voltage. This is optimised 339 * for CPUfreq usage, most processors will keep the maximum 340 * voltage constant and lower the minimum with the frequency. */ 341 vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV); 342 if (vsel < 0) { 343 /* This should never happen - at worst the same vsel 344 * should be chosen */ 345 WARN_ON(vsel < 0); 346 return 0; 347 } 348 349 /* Don't bother if it's the same VSEL we're already using */ 350 if (vsel == dcdc->on_vsel) 351 return 0; 352 353 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel); 354 if (ret == 0) 355 dcdc->dvs_vsel = vsel; 356 else 357 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n", 358 ret); 359 360 return 0; 361} 362 363static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 364 int uV) 365{ 366 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 367 struct wm831x *wm831x = dcdc->wm831x; 368 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 369 int vsel; 370 371 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV); 372 if (vsel < 0) 373 return vsel; 374 375 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 376} 377 378static int wm831x_buckv_get_voltage(struct regulator_dev *rdev) 379{ 380 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 381 382 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 383 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel); 384 else 385 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel); 386} 387 388/* Current limit options */ 389static u16 wm831x_dcdc_ilim[] = { 390 125, 250, 375, 500, 625, 750, 875, 1000 391}; 392 393static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 394 int min_uA, int max_uA) 395{ 396 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 397 struct wm831x *wm831x = dcdc->wm831x; 398 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 399 int i; 400 401 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 402 if (max_uA <= wm831x_dcdc_ilim[i]) 403 break; 404 } 405 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 406 return -EINVAL; 407 408 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); 409} 410 411static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 412{ 413 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 414 struct wm831x *wm831x = dcdc->wm831x; 415 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 416 int val; 417 418 val = wm831x_reg_read(wm831x, reg); 419 if (val < 0) 420 return val; 421 422 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; 423} 424 425static struct regulator_ops wm831x_buckv_ops = { 426 .set_voltage = wm831x_buckv_set_voltage, 427 .get_voltage = wm831x_buckv_get_voltage, 428 .list_voltage = wm831x_buckv_list_voltage, 429 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 430 .set_current_limit = wm831x_buckv_set_current_limit, 431 .get_current_limit = wm831x_buckv_get_current_limit, 432 433 .is_enabled = wm831x_dcdc_is_enabled, 434 .enable = wm831x_dcdc_enable, 435 .disable = wm831x_dcdc_disable, 436 .get_status = wm831x_dcdc_get_status, 437 .get_mode = wm831x_dcdc_get_mode, 438 .set_mode = wm831x_dcdc_set_mode, 439 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 440}; 441 442/* 443 * Set up DVS control. We just log errors since we can still run 444 * (with reduced performance) if we fail. 445 */ 446static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 447 struct wm831x_buckv_pdata *pdata) 448{ 449 struct wm831x *wm831x = dcdc->wm831x; 450 int ret; 451 u16 ctrl; 452 453 if (!pdata || !pdata->dvs_gpio) 454 return; 455 456 switch (pdata->dvs_control_src) { 457 case 1: 458 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 459 break; 460 case 2: 461 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 462 break; 463 default: 464 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 465 pdata->dvs_control_src, dcdc->name); 466 return; 467 } 468 469 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 470 WM831X_DC1_DVS_SRC_MASK, ctrl); 471 if (ret < 0) { 472 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 473 dcdc->name, ret); 474 return; 475 } 476 477 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); 478 if (ret < 0) { 479 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 480 dcdc->name, ret); 481 return; 482 } 483 484 /* gpiolib won't let us read the GPIO status so pick the higher 485 * of the two existing voltages so we take it as platform data. 486 */ 487 dcdc->dvs_gpio_state = pdata->dvs_init_state; 488 489 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); 490 if (ret < 0) { 491 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", 492 dcdc->name, ret); 493 gpio_free(pdata->dvs_gpio); 494 return; 495 } 496 497 dcdc->dvs_gpio = pdata->dvs_gpio; 498} 499 500static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 501{ 502 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 503 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 504 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 505 struct wm831x_dcdc *dcdc; 506 struct resource *res; 507 int ret, irq; 508 509 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 510 511 if (pdata == NULL || pdata->dcdc[id] == NULL) 512 return -ENODEV; 513 514 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 515 if (dcdc == NULL) { 516 dev_err(&pdev->dev, "Unable to allocate private data\n"); 517 return -ENOMEM; 518 } 519 520 dcdc->wm831x = wm831x; 521 522 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 523 if (res == NULL) { 524 dev_err(&pdev->dev, "No I/O resource\n"); 525 ret = -EINVAL; 526 goto err; 527 } 528 dcdc->base = res->start; 529 530 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 531 dcdc->desc.name = dcdc->name; 532 dcdc->desc.id = id; 533 dcdc->desc.type = REGULATOR_VOLTAGE; 534 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 535 dcdc->desc.ops = &wm831x_buckv_ops; 536 dcdc->desc.owner = THIS_MODULE; 537 538 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 539 if (ret < 0) { 540 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 541 goto err; 542 } 543 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 544 545 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 546 if (ret < 0) { 547 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 548 goto err; 549 } 550 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 551 552 if (pdata->dcdc[id]) 553 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 554 555 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 556 pdata->dcdc[id], dcdc); 557 if (IS_ERR(dcdc->regulator)) { 558 ret = PTR_ERR(dcdc->regulator); 559 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 560 id + 1, ret); 561 goto err; 562 } 563 564 irq = platform_get_irq_byname(pdev, "UV"); 565 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 566 IRQF_TRIGGER_RISING, dcdc->name, 567 dcdc); 568 if (ret != 0) { 569 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 570 irq, ret); 571 goto err_regulator; 572 } 573 574 irq = platform_get_irq_byname(pdev, "HC"); 575 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq, 576 IRQF_TRIGGER_RISING, dcdc->name, 577 dcdc); 578 if (ret != 0) { 579 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 580 irq, ret); 581 goto err_uv; 582 } 583 584 platform_set_drvdata(pdev, dcdc); 585 586 return 0; 587 588err_uv: 589 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 590err_regulator: 591 regulator_unregister(dcdc->regulator); 592err: 593 if (dcdc->dvs_gpio) 594 gpio_free(dcdc->dvs_gpio); 595 kfree(dcdc); 596 return ret; 597} 598 599static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 600{ 601 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 602 struct wm831x *wm831x = dcdc->wm831x; 603 604 platform_set_drvdata(pdev, NULL); 605 606 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc); 607 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 608 regulator_unregister(dcdc->regulator); 609 if (dcdc->dvs_gpio) 610 gpio_free(dcdc->dvs_gpio); 611 kfree(dcdc); 612 613 return 0; 614} 615 616static struct platform_driver wm831x_buckv_driver = { 617 .probe = wm831x_buckv_probe, 618 .remove = __devexit_p(wm831x_buckv_remove), 619 .driver = { 620 .name = "wm831x-buckv", 621 .owner = THIS_MODULE, 622 }, 623}; 624 625/* 626 * BUCKP specifics 627 */ 628 629static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, 630 unsigned selector) 631{ 632 if (selector <= WM831X_BUCKP_MAX_SELECTOR) 633 return 850000 + (selector * 25000); 634 else 635 return -EINVAL; 636} 637 638static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, 639 int min_uV, int max_uV) 640{ 641 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 642 struct wm831x *wm831x = dcdc->wm831x; 643 u16 vsel; 644 645 if (min_uV <= 34000000) 646 vsel = (min_uV - 850000) / 25000; 647 else 648 return -EINVAL; 649 650 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) 651 return -EINVAL; 652 653 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 654} 655 656static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 657 int min_uV, int max_uV) 658{ 659 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 660 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 661 662 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV); 663} 664 665static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 666 int uV) 667{ 668 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 669 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 670 671 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV); 672} 673 674static int wm831x_buckp_get_voltage(struct regulator_dev *rdev) 675{ 676 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 677 struct wm831x *wm831x = dcdc->wm831x; 678 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 679 int val; 680 681 val = wm831x_reg_read(wm831x, reg); 682 if (val < 0) 683 return val; 684 685 return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK); 686} 687 688static struct regulator_ops wm831x_buckp_ops = { 689 .set_voltage = wm831x_buckp_set_voltage, 690 .get_voltage = wm831x_buckp_get_voltage, 691 .list_voltage = wm831x_buckp_list_voltage, 692 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 693 694 .is_enabled = wm831x_dcdc_is_enabled, 695 .enable = wm831x_dcdc_enable, 696 .disable = wm831x_dcdc_disable, 697 .get_status = wm831x_dcdc_get_status, 698 .get_mode = wm831x_dcdc_get_mode, 699 .set_mode = wm831x_dcdc_set_mode, 700 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 701}; 702 703static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 704{ 705 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 706 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 707 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 708 struct wm831x_dcdc *dcdc; 709 struct resource *res; 710 int ret, irq; 711 712 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 713 714 if (pdata == NULL || pdata->dcdc[id] == NULL) 715 return -ENODEV; 716 717 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 718 if (dcdc == NULL) { 719 dev_err(&pdev->dev, "Unable to allocate private data\n"); 720 return -ENOMEM; 721 } 722 723 dcdc->wm831x = wm831x; 724 725 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 726 if (res == NULL) { 727 dev_err(&pdev->dev, "No I/O resource\n"); 728 ret = -EINVAL; 729 goto err; 730 } 731 dcdc->base = res->start; 732 733 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 734 dcdc->desc.name = dcdc->name; 735 dcdc->desc.id = id; 736 dcdc->desc.type = REGULATOR_VOLTAGE; 737 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 738 dcdc->desc.ops = &wm831x_buckp_ops; 739 dcdc->desc.owner = THIS_MODULE; 740 741 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 742 pdata->dcdc[id], dcdc); 743 if (IS_ERR(dcdc->regulator)) { 744 ret = PTR_ERR(dcdc->regulator); 745 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 746 id + 1, ret); 747 goto err; 748 } 749 750 irq = platform_get_irq_byname(pdev, "UV"); 751 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 752 IRQF_TRIGGER_RISING, dcdc->name, 753 dcdc); 754 if (ret != 0) { 755 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 756 irq, ret); 757 goto err_regulator; 758 } 759 760 platform_set_drvdata(pdev, dcdc); 761 762 return 0; 763 764err_regulator: 765 regulator_unregister(dcdc->regulator); 766err: 767 kfree(dcdc); 768 return ret; 769} 770 771static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 772{ 773 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 774 struct wm831x *wm831x = dcdc->wm831x; 775 776 platform_set_drvdata(pdev, NULL); 777 778 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 779 regulator_unregister(dcdc->regulator); 780 kfree(dcdc); 781 782 return 0; 783} 784 785static struct platform_driver wm831x_buckp_driver = { 786 .probe = wm831x_buckp_probe, 787 .remove = __devexit_p(wm831x_buckp_remove), 788 .driver = { 789 .name = "wm831x-buckp", 790 .owner = THIS_MODULE, 791 }, 792}; 793 794/* 795 * DCDC boost convertors 796 */ 797 798static int wm831x_boostp_get_status(struct regulator_dev *rdev) 799{ 800 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 801 struct wm831x *wm831x = dcdc->wm831x; 802 int ret; 803 804 /* First, check for errors */ 805 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 806 if (ret < 0) 807 return ret; 808 809 if (ret & (1 << rdev_get_id(rdev))) { 810 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 811 rdev_get_id(rdev) + 1); 812 return REGULATOR_STATUS_ERROR; 813 } 814 815 /* Is the regulator on? */ 816 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 817 if (ret < 0) 818 return ret; 819 if (ret & (1 << rdev_get_id(rdev))) 820 return REGULATOR_STATUS_ON; 821 else 822 return REGULATOR_STATUS_OFF; 823} 824 825static struct regulator_ops wm831x_boostp_ops = { 826 .get_status = wm831x_boostp_get_status, 827 828 .is_enabled = wm831x_dcdc_is_enabled, 829 .enable = wm831x_dcdc_enable, 830 .disable = wm831x_dcdc_disable, 831}; 832 833static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 834{ 835 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 836 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 837 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 838 struct wm831x_dcdc *dcdc; 839 struct resource *res; 840 int ret, irq; 841 842 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 843 844 if (pdata == NULL || pdata->dcdc[id] == NULL) 845 return -ENODEV; 846 847 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 848 if (dcdc == NULL) { 849 dev_err(&pdev->dev, "Unable to allocate private data\n"); 850 return -ENOMEM; 851 } 852 853 dcdc->wm831x = wm831x; 854 855 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 856 if (res == NULL) { 857 dev_err(&pdev->dev, "No I/O resource\n"); 858 ret = -EINVAL; 859 goto err; 860 } 861 dcdc->base = res->start; 862 863 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 864 dcdc->desc.name = dcdc->name; 865 dcdc->desc.id = id; 866 dcdc->desc.type = REGULATOR_VOLTAGE; 867 dcdc->desc.ops = &wm831x_boostp_ops; 868 dcdc->desc.owner = THIS_MODULE; 869 870 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 871 pdata->dcdc[id], dcdc); 872 if (IS_ERR(dcdc->regulator)) { 873 ret = PTR_ERR(dcdc->regulator); 874 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 875 id + 1, ret); 876 goto err; 877 } 878 879 irq = platform_get_irq_byname(pdev, "UV"); 880 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 881 IRQF_TRIGGER_RISING, dcdc->name, 882 dcdc); 883 if (ret != 0) { 884 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 885 irq, ret); 886 goto err_regulator; 887 } 888 889 platform_set_drvdata(pdev, dcdc); 890 891 return 0; 892 893err_regulator: 894 regulator_unregister(dcdc->regulator); 895err: 896 kfree(dcdc); 897 return ret; 898} 899 900static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 901{ 902 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 903 struct wm831x *wm831x = dcdc->wm831x; 904 905 platform_set_drvdata(pdev, NULL); 906 907 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 908 regulator_unregister(dcdc->regulator); 909 kfree(dcdc); 910 911 return 0; 912} 913 914static struct platform_driver wm831x_boostp_driver = { 915 .probe = wm831x_boostp_probe, 916 .remove = __devexit_p(wm831x_boostp_remove), 917 .driver = { 918 .name = "wm831x-boostp", 919 .owner = THIS_MODULE, 920 }, 921}; 922 923/* 924 * External Power Enable 925 * 926 * These aren't actually DCDCs but look like them in hardware so share 927 * code. 928 */ 929 930#define WM831X_EPE_BASE 6 931 932static struct regulator_ops wm831x_epe_ops = { 933 .is_enabled = wm831x_dcdc_is_enabled, 934 .enable = wm831x_dcdc_enable, 935 .disable = wm831x_dcdc_disable, 936 .get_status = wm831x_dcdc_get_status, 937}; 938 939static __devinit int wm831x_epe_probe(struct platform_device *pdev) 940{ 941 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 942 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 943 int id = pdev->id % ARRAY_SIZE(pdata->epe); 944 struct wm831x_dcdc *dcdc; 945 int ret; 946 947 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 948 949 if (pdata == NULL || pdata->epe[id] == NULL) 950 return -ENODEV; 951 952 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 953 if (dcdc == NULL) { 954 dev_err(&pdev->dev, "Unable to allocate private data\n"); 955 return -ENOMEM; 956 } 957 958 dcdc->wm831x = wm831x; 959 960 /* For current parts this is correct; probably need to revisit 961 * in future. 962 */ 963 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 964 dcdc->desc.name = dcdc->name; 965 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 966 dcdc->desc.ops = &wm831x_epe_ops; 967 dcdc->desc.type = REGULATOR_VOLTAGE; 968 dcdc->desc.owner = THIS_MODULE; 969 970 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 971 pdata->epe[id], dcdc); 972 if (IS_ERR(dcdc->regulator)) { 973 ret = PTR_ERR(dcdc->regulator); 974 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 975 id + 1, ret); 976 goto err; 977 } 978 979 platform_set_drvdata(pdev, dcdc); 980 981 return 0; 982 983err: 984 kfree(dcdc); 985 return ret; 986} 987 988static __devexit int wm831x_epe_remove(struct platform_device *pdev) 989{ 990 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 991 992 platform_set_drvdata(pdev, NULL); 993 994 regulator_unregister(dcdc->regulator); 995 kfree(dcdc); 996 997 return 0; 998} 999 1000static struct platform_driver wm831x_epe_driver = { 1001 .probe = wm831x_epe_probe, 1002 .remove = __devexit_p(wm831x_epe_remove), 1003 .driver = { 1004 .name = "wm831x-epe", 1005 .owner = THIS_MODULE, 1006 }, 1007}; 1008 1009static int __init wm831x_dcdc_init(void) 1010{ 1011 int ret; 1012 ret = platform_driver_register(&wm831x_buckv_driver); 1013 if (ret != 0) 1014 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1015 1016 ret = platform_driver_register(&wm831x_buckp_driver); 1017 if (ret != 0) 1018 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1019 1020 ret = platform_driver_register(&wm831x_boostp_driver); 1021 if (ret != 0) 1022 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1023 1024 ret = platform_driver_register(&wm831x_epe_driver); 1025 if (ret != 0) 1026 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1027 1028 return 0; 1029} 1030subsys_initcall(wm831x_dcdc_init); 1031 1032static void __exit wm831x_dcdc_exit(void) 1033{ 1034 platform_driver_unregister(&wm831x_epe_driver); 1035 platform_driver_unregister(&wm831x_boostp_driver); 1036 platform_driver_unregister(&wm831x_buckp_driver); 1037 platform_driver_unregister(&wm831x_buckv_driver); 1038} 1039module_exit(wm831x_dcdc_exit); 1040 1041/* Module information */ 1042MODULE_AUTHOR("Mark Brown"); 1043MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1044MODULE_LICENSE("GPL"); 1045MODULE_ALIAS("platform:wm831x-buckv"); 1046MODULE_ALIAS("platform:wm831x-buckp"); 1047