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