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 51 struct 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 63 static 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 80 static 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 89 static 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 98 static 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 return -EINVAL; 124 } 125 } 126 127 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 128 unsigned int mode) 129 { 130 int val; 131 132 switch (mode) { 133 case REGULATOR_MODE_FAST: 134 val = WM831X_DCDC_MODE_FAST; 135 break; 136 case REGULATOR_MODE_NORMAL: 137 val = WM831X_DCDC_MODE_NORMAL; 138 break; 139 case REGULATOR_MODE_STANDBY: 140 val = WM831X_DCDC_MODE_STANDBY; 141 break; 142 case REGULATOR_MODE_IDLE: 143 val = WM831X_DCDC_MODE_IDLE; 144 break; 145 default: 146 return -EINVAL; 147 } 148 149 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 150 val << WM831X_DC1_ON_MODE_SHIFT); 151 } 152 153 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 154 { 155 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 156 struct wm831x *wm831x = dcdc->wm831x; 157 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 158 159 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 160 } 161 162 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 163 unsigned int mode) 164 { 165 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 166 struct wm831x *wm831x = dcdc->wm831x; 167 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 168 169 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 170 } 171 172 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 173 { 174 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 175 struct wm831x *wm831x = dcdc->wm831x; 176 int ret; 177 178 /* First, check for errors */ 179 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 180 if (ret < 0) 181 return ret; 182 183 if (ret & (1 << rdev_get_id(rdev))) { 184 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 185 rdev_get_id(rdev) + 1); 186 return REGULATOR_STATUS_ERROR; 187 } 188 189 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 190 if (rdev_get_id(rdev) < 2) { 191 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 192 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 193 rdev_get_id(rdev) + 1); 194 return REGULATOR_STATUS_ERROR; 195 } 196 197 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 198 dev_dbg(wm831x->dev, "DCDC%d over current\n", 199 rdev_get_id(rdev) + 1); 200 return REGULATOR_STATUS_ERROR; 201 } 202 } 203 204 /* Is the regulator on? */ 205 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 206 if (ret < 0) 207 return ret; 208 if (!(ret & (1 << rdev_get_id(rdev)))) 209 return REGULATOR_STATUS_OFF; 210 211 /* TODO: When we handle hardware control modes so we can report the 212 * current mode. */ 213 return REGULATOR_STATUS_ON; 214 } 215 216 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 217 { 218 struct wm831x_dcdc *dcdc = data; 219 220 regulator_notifier_call_chain(dcdc->regulator, 221 REGULATOR_EVENT_UNDER_VOLTAGE, 222 NULL); 223 224 return IRQ_HANDLED; 225 } 226 227 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 228 { 229 struct wm831x_dcdc *dcdc = data; 230 231 regulator_notifier_call_chain(dcdc->regulator, 232 REGULATOR_EVENT_OVER_CURRENT, 233 NULL); 234 235 return IRQ_HANDLED; 236 } 237 238 /* 239 * BUCKV specifics 240 */ 241 242 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 243 unsigned selector) 244 { 245 if (selector <= 0x8) 246 return 600000; 247 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 248 return 600000 + ((selector - 0x8) * 12500); 249 return -EINVAL; 250 } 251 252 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev, 253 int min_uV, int max_uV) 254 { 255 u16 vsel; 256 257 if (min_uV < 600000) 258 vsel = 0; 259 else if (min_uV <= 1800000) 260 vsel = ((min_uV - 600000) / 12500) + 8; 261 else 262 return -EINVAL; 263 264 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 265 return -EINVAL; 266 267 return vsel; 268 } 269 270 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev, 271 int min_uV, int max_uV) 272 { 273 u16 vsel; 274 275 if (max_uV < 600000 || max_uV > 1800000) 276 return -EINVAL; 277 278 vsel = ((max_uV - 600000) / 12500) + 8; 279 280 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV || 281 wm831x_buckv_list_voltage(rdev, vsel) < max_uV) 282 return -EINVAL; 283 284 return vsel; 285 } 286 287 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 288 { 289 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 290 291 if (state == dcdc->dvs_gpio_state) 292 return 0; 293 294 dcdc->dvs_gpio_state = state; 295 gpio_set_value(dcdc->dvs_gpio, state); 296 297 /* Should wait for DVS state change to be asserted if we have 298 * a GPIO for it, for now assume the device is configured 299 * for the fastest possible transition. 300 */ 301 302 return 0; 303 } 304 305 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, 306 int min_uV, int max_uV, unsigned *selector) 307 { 308 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 309 struct wm831x *wm831x = dcdc->wm831x; 310 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 311 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 312 int vsel, ret; 313 314 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV); 315 if (vsel < 0) 316 return vsel; 317 318 *selector = vsel; 319 320 /* If this value is already set then do a GPIO update if we can */ 321 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 322 return wm831x_buckv_set_dvs(rdev, 0); 323 324 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 325 return wm831x_buckv_set_dvs(rdev, 1); 326 327 /* Always set the ON status to the minimum voltage */ 328 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 329 if (ret < 0) 330 return ret; 331 dcdc->on_vsel = vsel; 332 333 if (!dcdc->dvs_gpio) 334 return ret; 335 336 /* Kick the voltage transition now */ 337 ret = wm831x_buckv_set_dvs(rdev, 0); 338 if (ret < 0) 339 return ret; 340 341 /* Set the high voltage as the DVS voltage. This is optimised 342 * for CPUfreq usage, most processors will keep the maximum 343 * voltage constant and lower the minimum with the frequency. */ 344 vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV); 345 if (vsel < 0) { 346 /* This should never happen - at worst the same vsel 347 * should be chosen */ 348 WARN_ON(vsel < 0); 349 return 0; 350 } 351 352 /* Don't bother if it's the same VSEL we're already using */ 353 if (vsel == dcdc->on_vsel) 354 return 0; 355 356 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel); 357 if (ret == 0) 358 dcdc->dvs_vsel = vsel; 359 else 360 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n", 361 ret); 362 363 return 0; 364 } 365 366 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 367 int uV) 368 { 369 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 370 struct wm831x *wm831x = dcdc->wm831x; 371 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 372 int vsel; 373 374 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV); 375 if (vsel < 0) 376 return vsel; 377 378 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 379 } 380 381 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) 382 { 383 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 384 385 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 386 return dcdc->dvs_vsel; 387 else 388 return dcdc->on_vsel; 389 } 390 391 /* Current limit options */ 392 static u16 wm831x_dcdc_ilim[] = { 393 125, 250, 375, 500, 625, 750, 875, 1000 394 }; 395 396 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 397 int min_uA, int max_uA) 398 { 399 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 400 struct wm831x *wm831x = dcdc->wm831x; 401 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 402 int i; 403 404 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 405 if (max_uA <= wm831x_dcdc_ilim[i]) 406 break; 407 } 408 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 409 return -EINVAL; 410 411 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); 412 } 413 414 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 415 { 416 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 417 struct wm831x *wm831x = dcdc->wm831x; 418 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 419 int val; 420 421 val = wm831x_reg_read(wm831x, reg); 422 if (val < 0) 423 return val; 424 425 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; 426 } 427 428 static struct regulator_ops wm831x_buckv_ops = { 429 .set_voltage = wm831x_buckv_set_voltage, 430 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 431 .list_voltage = wm831x_buckv_list_voltage, 432 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 433 .set_current_limit = wm831x_buckv_set_current_limit, 434 .get_current_limit = wm831x_buckv_get_current_limit, 435 436 .is_enabled = wm831x_dcdc_is_enabled, 437 .enable = wm831x_dcdc_enable, 438 .disable = wm831x_dcdc_disable, 439 .get_status = wm831x_dcdc_get_status, 440 .get_mode = wm831x_dcdc_get_mode, 441 .set_mode = wm831x_dcdc_set_mode, 442 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 443 }; 444 445 /* 446 * Set up DVS control. We just log errors since we can still run 447 * (with reduced performance) if we fail. 448 */ 449 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 450 struct wm831x_buckv_pdata *pdata) 451 { 452 struct wm831x *wm831x = dcdc->wm831x; 453 int ret; 454 u16 ctrl; 455 456 if (!pdata || !pdata->dvs_gpio) 457 return; 458 459 switch (pdata->dvs_control_src) { 460 case 1: 461 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 462 break; 463 case 2: 464 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 465 break; 466 default: 467 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 468 pdata->dvs_control_src, dcdc->name); 469 return; 470 } 471 472 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 473 WM831X_DC1_DVS_SRC_MASK, ctrl); 474 if (ret < 0) { 475 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 476 dcdc->name, ret); 477 return; 478 } 479 480 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); 481 if (ret < 0) { 482 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 483 dcdc->name, ret); 484 return; 485 } 486 487 /* gpiolib won't let us read the GPIO status so pick the higher 488 * of the two existing voltages so we take it as platform data. 489 */ 490 dcdc->dvs_gpio_state = pdata->dvs_init_state; 491 492 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); 493 if (ret < 0) { 494 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", 495 dcdc->name, ret); 496 gpio_free(pdata->dvs_gpio); 497 return; 498 } 499 500 dcdc->dvs_gpio = pdata->dvs_gpio; 501 } 502 503 static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 504 { 505 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 506 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 507 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 508 struct wm831x_dcdc *dcdc; 509 struct resource *res; 510 int ret, irq; 511 512 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 513 514 if (pdata == NULL || pdata->dcdc[id] == NULL) 515 return -ENODEV; 516 517 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 518 if (dcdc == NULL) { 519 dev_err(&pdev->dev, "Unable to allocate private data\n"); 520 return -ENOMEM; 521 } 522 523 dcdc->wm831x = wm831x; 524 525 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 526 if (res == NULL) { 527 dev_err(&pdev->dev, "No I/O resource\n"); 528 ret = -EINVAL; 529 goto err; 530 } 531 dcdc->base = res->start; 532 533 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 534 dcdc->desc.name = dcdc->name; 535 dcdc->desc.id = id; 536 dcdc->desc.type = REGULATOR_VOLTAGE; 537 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 538 dcdc->desc.ops = &wm831x_buckv_ops; 539 dcdc->desc.owner = THIS_MODULE; 540 541 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 542 if (ret < 0) { 543 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 544 goto err; 545 } 546 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 547 548 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 549 if (ret < 0) { 550 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 551 goto err; 552 } 553 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 554 555 if (pdata->dcdc[id]) 556 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 557 558 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 559 pdata->dcdc[id], dcdc); 560 if (IS_ERR(dcdc->regulator)) { 561 ret = PTR_ERR(dcdc->regulator); 562 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 563 id + 1, ret); 564 goto err; 565 } 566 567 irq = platform_get_irq_byname(pdev, "UV"); 568 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 569 IRQF_TRIGGER_RISING, dcdc->name, 570 dcdc); 571 if (ret != 0) { 572 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 573 irq, ret); 574 goto err_regulator; 575 } 576 577 irq = platform_get_irq_byname(pdev, "HC"); 578 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq, 579 IRQF_TRIGGER_RISING, dcdc->name, 580 dcdc); 581 if (ret != 0) { 582 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 583 irq, ret); 584 goto err_uv; 585 } 586 587 platform_set_drvdata(pdev, dcdc); 588 589 return 0; 590 591 err_uv: 592 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 593 err_regulator: 594 regulator_unregister(dcdc->regulator); 595 err: 596 if (dcdc->dvs_gpio) 597 gpio_free(dcdc->dvs_gpio); 598 kfree(dcdc); 599 return ret; 600 } 601 602 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 603 { 604 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 605 struct wm831x *wm831x = dcdc->wm831x; 606 607 platform_set_drvdata(pdev, NULL); 608 609 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc); 610 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 611 regulator_unregister(dcdc->regulator); 612 if (dcdc->dvs_gpio) 613 gpio_free(dcdc->dvs_gpio); 614 kfree(dcdc); 615 616 return 0; 617 } 618 619 static struct platform_driver wm831x_buckv_driver = { 620 .probe = wm831x_buckv_probe, 621 .remove = __devexit_p(wm831x_buckv_remove), 622 .driver = { 623 .name = "wm831x-buckv", 624 .owner = THIS_MODULE, 625 }, 626 }; 627 628 /* 629 * BUCKP specifics 630 */ 631 632 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, 633 unsigned selector) 634 { 635 if (selector <= WM831X_BUCKP_MAX_SELECTOR) 636 return 850000 + (selector * 25000); 637 else 638 return -EINVAL; 639 } 640 641 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, 642 int min_uV, int max_uV, int *selector) 643 { 644 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 645 struct wm831x *wm831x = dcdc->wm831x; 646 u16 vsel; 647 648 if (min_uV <= 34000000) 649 vsel = (min_uV - 850000) / 25000; 650 else 651 return -EINVAL; 652 653 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) 654 return -EINVAL; 655 656 *selector = vsel; 657 658 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 659 } 660 661 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 662 int min_uV, int max_uV, 663 unsigned *selector) 664 { 665 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 666 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 667 668 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV, 669 selector); 670 } 671 672 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 673 int uV) 674 { 675 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 676 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 677 unsigned selector; 678 679 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector); 680 } 681 682 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev) 683 { 684 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 685 struct wm831x *wm831x = dcdc->wm831x; 686 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 687 int val; 688 689 val = wm831x_reg_read(wm831x, reg); 690 if (val < 0) 691 return val; 692 693 return val & WM831X_DC3_ON_VSEL_MASK; 694 } 695 696 static struct regulator_ops wm831x_buckp_ops = { 697 .set_voltage = wm831x_buckp_set_voltage, 698 .get_voltage_sel = wm831x_buckp_get_voltage_sel, 699 .list_voltage = wm831x_buckp_list_voltage, 700 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 701 702 .is_enabled = wm831x_dcdc_is_enabled, 703 .enable = wm831x_dcdc_enable, 704 .disable = wm831x_dcdc_disable, 705 .get_status = wm831x_dcdc_get_status, 706 .get_mode = wm831x_dcdc_get_mode, 707 .set_mode = wm831x_dcdc_set_mode, 708 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 709 }; 710 711 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 712 { 713 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 714 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 715 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 716 struct wm831x_dcdc *dcdc; 717 struct resource *res; 718 int ret, irq; 719 720 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 721 722 if (pdata == NULL || pdata->dcdc[id] == NULL) 723 return -ENODEV; 724 725 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 726 if (dcdc == NULL) { 727 dev_err(&pdev->dev, "Unable to allocate private data\n"); 728 return -ENOMEM; 729 } 730 731 dcdc->wm831x = wm831x; 732 733 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 734 if (res == NULL) { 735 dev_err(&pdev->dev, "No I/O resource\n"); 736 ret = -EINVAL; 737 goto err; 738 } 739 dcdc->base = res->start; 740 741 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 742 dcdc->desc.name = dcdc->name; 743 dcdc->desc.id = id; 744 dcdc->desc.type = REGULATOR_VOLTAGE; 745 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 746 dcdc->desc.ops = &wm831x_buckp_ops; 747 dcdc->desc.owner = THIS_MODULE; 748 749 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 750 pdata->dcdc[id], dcdc); 751 if (IS_ERR(dcdc->regulator)) { 752 ret = PTR_ERR(dcdc->regulator); 753 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 754 id + 1, ret); 755 goto err; 756 } 757 758 irq = platform_get_irq_byname(pdev, "UV"); 759 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 760 IRQF_TRIGGER_RISING, dcdc->name, 761 dcdc); 762 if (ret != 0) { 763 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 764 irq, ret); 765 goto err_regulator; 766 } 767 768 platform_set_drvdata(pdev, dcdc); 769 770 return 0; 771 772 err_regulator: 773 regulator_unregister(dcdc->regulator); 774 err: 775 kfree(dcdc); 776 return ret; 777 } 778 779 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 780 { 781 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 782 struct wm831x *wm831x = dcdc->wm831x; 783 784 platform_set_drvdata(pdev, NULL); 785 786 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 787 regulator_unregister(dcdc->regulator); 788 kfree(dcdc); 789 790 return 0; 791 } 792 793 static struct platform_driver wm831x_buckp_driver = { 794 .probe = wm831x_buckp_probe, 795 .remove = __devexit_p(wm831x_buckp_remove), 796 .driver = { 797 .name = "wm831x-buckp", 798 .owner = THIS_MODULE, 799 }, 800 }; 801 802 /* 803 * DCDC boost convertors 804 */ 805 806 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 807 { 808 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 809 struct wm831x *wm831x = dcdc->wm831x; 810 int ret; 811 812 /* First, check for errors */ 813 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 814 if (ret < 0) 815 return ret; 816 817 if (ret & (1 << rdev_get_id(rdev))) { 818 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 819 rdev_get_id(rdev) + 1); 820 return REGULATOR_STATUS_ERROR; 821 } 822 823 /* Is the regulator on? */ 824 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 825 if (ret < 0) 826 return ret; 827 if (ret & (1 << rdev_get_id(rdev))) 828 return REGULATOR_STATUS_ON; 829 else 830 return REGULATOR_STATUS_OFF; 831 } 832 833 static struct regulator_ops wm831x_boostp_ops = { 834 .get_status = wm831x_boostp_get_status, 835 836 .is_enabled = wm831x_dcdc_is_enabled, 837 .enable = wm831x_dcdc_enable, 838 .disable = wm831x_dcdc_disable, 839 }; 840 841 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 842 { 843 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 844 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 845 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 846 struct wm831x_dcdc *dcdc; 847 struct resource *res; 848 int ret, irq; 849 850 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 851 852 if (pdata == NULL || pdata->dcdc[id] == NULL) 853 return -ENODEV; 854 855 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 856 if (dcdc == NULL) { 857 dev_err(&pdev->dev, "Unable to allocate private data\n"); 858 return -ENOMEM; 859 } 860 861 dcdc->wm831x = wm831x; 862 863 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 864 if (res == NULL) { 865 dev_err(&pdev->dev, "No I/O resource\n"); 866 ret = -EINVAL; 867 goto err; 868 } 869 dcdc->base = res->start; 870 871 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 872 dcdc->desc.name = dcdc->name; 873 dcdc->desc.id = id; 874 dcdc->desc.type = REGULATOR_VOLTAGE; 875 dcdc->desc.ops = &wm831x_boostp_ops; 876 dcdc->desc.owner = THIS_MODULE; 877 878 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 879 pdata->dcdc[id], dcdc); 880 if (IS_ERR(dcdc->regulator)) { 881 ret = PTR_ERR(dcdc->regulator); 882 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 883 id + 1, ret); 884 goto err; 885 } 886 887 irq = platform_get_irq_byname(pdev, "UV"); 888 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 889 IRQF_TRIGGER_RISING, dcdc->name, 890 dcdc); 891 if (ret != 0) { 892 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 893 irq, ret); 894 goto err_regulator; 895 } 896 897 platform_set_drvdata(pdev, dcdc); 898 899 return 0; 900 901 err_regulator: 902 regulator_unregister(dcdc->regulator); 903 err: 904 kfree(dcdc); 905 return ret; 906 } 907 908 static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 909 { 910 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 911 struct wm831x *wm831x = dcdc->wm831x; 912 913 platform_set_drvdata(pdev, NULL); 914 915 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 916 regulator_unregister(dcdc->regulator); 917 kfree(dcdc); 918 919 return 0; 920 } 921 922 static struct platform_driver wm831x_boostp_driver = { 923 .probe = wm831x_boostp_probe, 924 .remove = __devexit_p(wm831x_boostp_remove), 925 .driver = { 926 .name = "wm831x-boostp", 927 .owner = THIS_MODULE, 928 }, 929 }; 930 931 /* 932 * External Power Enable 933 * 934 * These aren't actually DCDCs but look like them in hardware so share 935 * code. 936 */ 937 938 #define WM831X_EPE_BASE 6 939 940 static struct regulator_ops wm831x_epe_ops = { 941 .is_enabled = wm831x_dcdc_is_enabled, 942 .enable = wm831x_dcdc_enable, 943 .disable = wm831x_dcdc_disable, 944 .get_status = wm831x_dcdc_get_status, 945 }; 946 947 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 948 { 949 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 950 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 951 int id = pdev->id % ARRAY_SIZE(pdata->epe); 952 struct wm831x_dcdc *dcdc; 953 int ret; 954 955 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 956 957 if (pdata == NULL || pdata->epe[id] == NULL) 958 return -ENODEV; 959 960 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 961 if (dcdc == NULL) { 962 dev_err(&pdev->dev, "Unable to allocate private data\n"); 963 return -ENOMEM; 964 } 965 966 dcdc->wm831x = wm831x; 967 968 /* For current parts this is correct; probably need to revisit 969 * in future. 970 */ 971 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 972 dcdc->desc.name = dcdc->name; 973 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 974 dcdc->desc.ops = &wm831x_epe_ops; 975 dcdc->desc.type = REGULATOR_VOLTAGE; 976 dcdc->desc.owner = THIS_MODULE; 977 978 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 979 pdata->epe[id], dcdc); 980 if (IS_ERR(dcdc->regulator)) { 981 ret = PTR_ERR(dcdc->regulator); 982 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 983 id + 1, ret); 984 goto err; 985 } 986 987 platform_set_drvdata(pdev, dcdc); 988 989 return 0; 990 991 err: 992 kfree(dcdc); 993 return ret; 994 } 995 996 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 997 { 998 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 999 1000 platform_set_drvdata(pdev, NULL); 1001 1002 regulator_unregister(dcdc->regulator); 1003 kfree(dcdc); 1004 1005 return 0; 1006 } 1007 1008 static struct platform_driver wm831x_epe_driver = { 1009 .probe = wm831x_epe_probe, 1010 .remove = __devexit_p(wm831x_epe_remove), 1011 .driver = { 1012 .name = "wm831x-epe", 1013 .owner = THIS_MODULE, 1014 }, 1015 }; 1016 1017 static int __init wm831x_dcdc_init(void) 1018 { 1019 int ret; 1020 ret = platform_driver_register(&wm831x_buckv_driver); 1021 if (ret != 0) 1022 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1023 1024 ret = platform_driver_register(&wm831x_buckp_driver); 1025 if (ret != 0) 1026 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1027 1028 ret = platform_driver_register(&wm831x_boostp_driver); 1029 if (ret != 0) 1030 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1031 1032 ret = platform_driver_register(&wm831x_epe_driver); 1033 if (ret != 0) 1034 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1035 1036 return 0; 1037 } 1038 subsys_initcall(wm831x_dcdc_init); 1039 1040 static void __exit wm831x_dcdc_exit(void) 1041 { 1042 platform_driver_unregister(&wm831x_epe_driver); 1043 platform_driver_unregister(&wm831x_boostp_driver); 1044 platform_driver_unregister(&wm831x_buckp_driver); 1045 platform_driver_unregister(&wm831x_buckv_driver); 1046 } 1047 module_exit(wm831x_dcdc_exit); 1048 1049 /* Module information */ 1050 MODULE_AUTHOR("Mark Brown"); 1051 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1052 MODULE_LICENSE("GPL"); 1053 MODULE_ALIAS("platform:wm831x-buckv"); 1054 MODULE_ALIAS("platform:wm831x-buckp"); 1055