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; 508 struct wm831x_dcdc *dcdc; 509 struct resource *res; 510 int ret, irq; 511 512 if (pdata && pdata->wm831x_num) 513 id = (pdata->wm831x_num * 10) + 1; 514 else 515 id = 0; 516 id = pdev->id - id; 517 518 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 519 520 if (pdata == NULL || pdata->dcdc[id] == NULL) 521 return -ENODEV; 522 523 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 524 if (dcdc == NULL) { 525 dev_err(&pdev->dev, "Unable to allocate private data\n"); 526 return -ENOMEM; 527 } 528 529 dcdc->wm831x = wm831x; 530 531 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 532 if (res == NULL) { 533 dev_err(&pdev->dev, "No I/O resource\n"); 534 ret = -EINVAL; 535 goto err; 536 } 537 dcdc->base = res->start; 538 539 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 540 dcdc->desc.name = dcdc->name; 541 dcdc->desc.id = id; 542 dcdc->desc.type = REGULATOR_VOLTAGE; 543 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 544 dcdc->desc.ops = &wm831x_buckv_ops; 545 dcdc->desc.owner = THIS_MODULE; 546 547 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 548 if (ret < 0) { 549 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 550 goto err; 551 } 552 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 553 554 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 555 if (ret < 0) { 556 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 557 goto err; 558 } 559 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 560 561 if (pdata->dcdc[id]) 562 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 563 564 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 565 pdata->dcdc[id], dcdc); 566 if (IS_ERR(dcdc->regulator)) { 567 ret = PTR_ERR(dcdc->regulator); 568 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 569 id + 1, ret); 570 goto err; 571 } 572 573 irq = platform_get_irq_byname(pdev, "UV"); 574 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 575 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 576 if (ret != 0) { 577 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 578 irq, ret); 579 goto err_regulator; 580 } 581 582 irq = platform_get_irq_byname(pdev, "HC"); 583 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 584 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 585 if (ret != 0) { 586 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 587 irq, ret); 588 goto err_uv; 589 } 590 591 platform_set_drvdata(pdev, dcdc); 592 593 return 0; 594 595 err_uv: 596 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 597 err_regulator: 598 regulator_unregister(dcdc->regulator); 599 err: 600 if (dcdc->dvs_gpio) 601 gpio_free(dcdc->dvs_gpio); 602 kfree(dcdc); 603 return ret; 604 } 605 606 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 607 { 608 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 609 610 platform_set_drvdata(pdev, NULL); 611 612 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc); 613 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 614 regulator_unregister(dcdc->regulator); 615 if (dcdc->dvs_gpio) 616 gpio_free(dcdc->dvs_gpio); 617 kfree(dcdc); 618 619 return 0; 620 } 621 622 static struct platform_driver wm831x_buckv_driver = { 623 .probe = wm831x_buckv_probe, 624 .remove = __devexit_p(wm831x_buckv_remove), 625 .driver = { 626 .name = "wm831x-buckv", 627 .owner = THIS_MODULE, 628 }, 629 }; 630 631 /* 632 * BUCKP specifics 633 */ 634 635 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, 636 unsigned selector) 637 { 638 if (selector <= WM831X_BUCKP_MAX_SELECTOR) 639 return 850000 + (selector * 25000); 640 else 641 return -EINVAL; 642 } 643 644 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, 645 int min_uV, int max_uV, int *selector) 646 { 647 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 648 struct wm831x *wm831x = dcdc->wm831x; 649 u16 vsel; 650 651 if (min_uV <= 34000000) 652 vsel = (min_uV - 850000) / 25000; 653 else 654 return -EINVAL; 655 656 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) 657 return -EINVAL; 658 659 *selector = vsel; 660 661 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 662 } 663 664 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 665 int min_uV, int max_uV, 666 unsigned *selector) 667 { 668 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 669 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 670 671 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV, 672 selector); 673 } 674 675 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 676 int uV) 677 { 678 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 679 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 680 unsigned selector; 681 682 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector); 683 } 684 685 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev) 686 { 687 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 688 struct wm831x *wm831x = dcdc->wm831x; 689 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 690 int val; 691 692 val = wm831x_reg_read(wm831x, reg); 693 if (val < 0) 694 return val; 695 696 return val & WM831X_DC3_ON_VSEL_MASK; 697 } 698 699 static struct regulator_ops wm831x_buckp_ops = { 700 .set_voltage = wm831x_buckp_set_voltage, 701 .get_voltage_sel = wm831x_buckp_get_voltage_sel, 702 .list_voltage = wm831x_buckp_list_voltage, 703 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 704 705 .is_enabled = wm831x_dcdc_is_enabled, 706 .enable = wm831x_dcdc_enable, 707 .disable = wm831x_dcdc_disable, 708 .get_status = wm831x_dcdc_get_status, 709 .get_mode = wm831x_dcdc_get_mode, 710 .set_mode = wm831x_dcdc_set_mode, 711 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 712 }; 713 714 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 715 { 716 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 717 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 718 int id; 719 struct wm831x_dcdc *dcdc; 720 struct resource *res; 721 int ret, irq; 722 723 if (pdata && pdata->wm831x_num) 724 id = (pdata->wm831x_num * 10) + 1; 725 else 726 id = 0; 727 id = pdev->id - id; 728 729 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 730 731 if (pdata == NULL || pdata->dcdc[id] == NULL) 732 return -ENODEV; 733 734 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 735 if (dcdc == NULL) { 736 dev_err(&pdev->dev, "Unable to allocate private data\n"); 737 return -ENOMEM; 738 } 739 740 dcdc->wm831x = wm831x; 741 742 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 743 if (res == NULL) { 744 dev_err(&pdev->dev, "No I/O resource\n"); 745 ret = -EINVAL; 746 goto err; 747 } 748 dcdc->base = res->start; 749 750 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 751 dcdc->desc.name = dcdc->name; 752 dcdc->desc.id = id; 753 dcdc->desc.type = REGULATOR_VOLTAGE; 754 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 755 dcdc->desc.ops = &wm831x_buckp_ops; 756 dcdc->desc.owner = THIS_MODULE; 757 758 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 759 pdata->dcdc[id], dcdc); 760 if (IS_ERR(dcdc->regulator)) { 761 ret = PTR_ERR(dcdc->regulator); 762 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 763 id + 1, ret); 764 goto err; 765 } 766 767 irq = platform_get_irq_byname(pdev, "UV"); 768 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 769 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 770 if (ret != 0) { 771 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 772 irq, ret); 773 goto err_regulator; 774 } 775 776 platform_set_drvdata(pdev, dcdc); 777 778 return 0; 779 780 err_regulator: 781 regulator_unregister(dcdc->regulator); 782 err: 783 kfree(dcdc); 784 return ret; 785 } 786 787 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 788 { 789 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 790 791 platform_set_drvdata(pdev, NULL); 792 793 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 794 regulator_unregister(dcdc->regulator); 795 kfree(dcdc); 796 797 return 0; 798 } 799 800 static struct platform_driver wm831x_buckp_driver = { 801 .probe = wm831x_buckp_probe, 802 .remove = __devexit_p(wm831x_buckp_remove), 803 .driver = { 804 .name = "wm831x-buckp", 805 .owner = THIS_MODULE, 806 }, 807 }; 808 809 /* 810 * DCDC boost convertors 811 */ 812 813 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 814 { 815 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 816 struct wm831x *wm831x = dcdc->wm831x; 817 int ret; 818 819 /* First, check for errors */ 820 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 821 if (ret < 0) 822 return ret; 823 824 if (ret & (1 << rdev_get_id(rdev))) { 825 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 826 rdev_get_id(rdev) + 1); 827 return REGULATOR_STATUS_ERROR; 828 } 829 830 /* Is the regulator on? */ 831 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 832 if (ret < 0) 833 return ret; 834 if (ret & (1 << rdev_get_id(rdev))) 835 return REGULATOR_STATUS_ON; 836 else 837 return REGULATOR_STATUS_OFF; 838 } 839 840 static struct regulator_ops wm831x_boostp_ops = { 841 .get_status = wm831x_boostp_get_status, 842 843 .is_enabled = wm831x_dcdc_is_enabled, 844 .enable = wm831x_dcdc_enable, 845 .disable = wm831x_dcdc_disable, 846 }; 847 848 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 849 { 850 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 851 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 852 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 853 struct wm831x_dcdc *dcdc; 854 struct resource *res; 855 int ret, irq; 856 857 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 858 859 if (pdata == NULL || pdata->dcdc[id] == NULL) 860 return -ENODEV; 861 862 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 863 if (dcdc == NULL) { 864 dev_err(&pdev->dev, "Unable to allocate private data\n"); 865 return -ENOMEM; 866 } 867 868 dcdc->wm831x = wm831x; 869 870 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 871 if (res == NULL) { 872 dev_err(&pdev->dev, "No I/O resource\n"); 873 ret = -EINVAL; 874 goto err; 875 } 876 dcdc->base = res->start; 877 878 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 879 dcdc->desc.name = dcdc->name; 880 dcdc->desc.id = id; 881 dcdc->desc.type = REGULATOR_VOLTAGE; 882 dcdc->desc.ops = &wm831x_boostp_ops; 883 dcdc->desc.owner = THIS_MODULE; 884 885 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 886 pdata->dcdc[id], dcdc); 887 if (IS_ERR(dcdc->regulator)) { 888 ret = PTR_ERR(dcdc->regulator); 889 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 890 id + 1, ret); 891 goto err; 892 } 893 894 irq = platform_get_irq_byname(pdev, "UV"); 895 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 896 IRQF_TRIGGER_RISING, dcdc->name, 897 dcdc); 898 if (ret != 0) { 899 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 900 irq, ret); 901 goto err_regulator; 902 } 903 904 platform_set_drvdata(pdev, dcdc); 905 906 return 0; 907 908 err_regulator: 909 regulator_unregister(dcdc->regulator); 910 err: 911 kfree(dcdc); 912 return ret; 913 } 914 915 static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 916 { 917 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 918 919 platform_set_drvdata(pdev, NULL); 920 921 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 922 regulator_unregister(dcdc->regulator); 923 kfree(dcdc); 924 925 return 0; 926 } 927 928 static struct platform_driver wm831x_boostp_driver = { 929 .probe = wm831x_boostp_probe, 930 .remove = __devexit_p(wm831x_boostp_remove), 931 .driver = { 932 .name = "wm831x-boostp", 933 .owner = THIS_MODULE, 934 }, 935 }; 936 937 /* 938 * External Power Enable 939 * 940 * These aren't actually DCDCs but look like them in hardware so share 941 * code. 942 */ 943 944 #define WM831X_EPE_BASE 6 945 946 static struct regulator_ops wm831x_epe_ops = { 947 .is_enabled = wm831x_dcdc_is_enabled, 948 .enable = wm831x_dcdc_enable, 949 .disable = wm831x_dcdc_disable, 950 .get_status = wm831x_dcdc_get_status, 951 }; 952 953 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 954 { 955 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 956 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 957 int id = pdev->id % ARRAY_SIZE(pdata->epe); 958 struct wm831x_dcdc *dcdc; 959 int ret; 960 961 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 962 963 if (pdata == NULL || pdata->epe[id] == NULL) 964 return -ENODEV; 965 966 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 967 if (dcdc == NULL) { 968 dev_err(&pdev->dev, "Unable to allocate private data\n"); 969 return -ENOMEM; 970 } 971 972 dcdc->wm831x = wm831x; 973 974 /* For current parts this is correct; probably need to revisit 975 * in future. 976 */ 977 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 978 dcdc->desc.name = dcdc->name; 979 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 980 dcdc->desc.ops = &wm831x_epe_ops; 981 dcdc->desc.type = REGULATOR_VOLTAGE; 982 dcdc->desc.owner = THIS_MODULE; 983 984 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 985 pdata->epe[id], dcdc); 986 if (IS_ERR(dcdc->regulator)) { 987 ret = PTR_ERR(dcdc->regulator); 988 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 989 id + 1, ret); 990 goto err; 991 } 992 993 platform_set_drvdata(pdev, dcdc); 994 995 return 0; 996 997 err: 998 kfree(dcdc); 999 return ret; 1000 } 1001 1002 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 1003 { 1004 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 1005 1006 platform_set_drvdata(pdev, NULL); 1007 1008 regulator_unregister(dcdc->regulator); 1009 kfree(dcdc); 1010 1011 return 0; 1012 } 1013 1014 static struct platform_driver wm831x_epe_driver = { 1015 .probe = wm831x_epe_probe, 1016 .remove = __devexit_p(wm831x_epe_remove), 1017 .driver = { 1018 .name = "wm831x-epe", 1019 .owner = THIS_MODULE, 1020 }, 1021 }; 1022 1023 static int __init wm831x_dcdc_init(void) 1024 { 1025 int ret; 1026 ret = platform_driver_register(&wm831x_buckv_driver); 1027 if (ret != 0) 1028 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1029 1030 ret = platform_driver_register(&wm831x_buckp_driver); 1031 if (ret != 0) 1032 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1033 1034 ret = platform_driver_register(&wm831x_boostp_driver); 1035 if (ret != 0) 1036 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1037 1038 ret = platform_driver_register(&wm831x_epe_driver); 1039 if (ret != 0) 1040 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1041 1042 return 0; 1043 } 1044 subsys_initcall(wm831x_dcdc_init); 1045 1046 static void __exit wm831x_dcdc_exit(void) 1047 { 1048 platform_driver_unregister(&wm831x_epe_driver); 1049 platform_driver_unregister(&wm831x_boostp_driver); 1050 platform_driver_unregister(&wm831x_buckp_driver); 1051 platform_driver_unregister(&wm831x_buckv_driver); 1052 } 1053 module_exit(wm831x_dcdc_exit); 1054 1055 /* Module information */ 1056 MODULE_AUTHOR("Mark Brown"); 1057 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1058 MODULE_LICENSE("GPL"); 1059 MODULE_ALIAS("platform:wm831x-buckv"); 1060 MODULE_ALIAS("platform:wm831x-buckp"); 1061