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_set_dvs(struct regulator_dev *rdev, int state) 271 { 272 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 273 274 if (state == dcdc->dvs_gpio_state) 275 return 0; 276 277 dcdc->dvs_gpio_state = state; 278 gpio_set_value(dcdc->dvs_gpio, state); 279 280 /* Should wait for DVS state change to be asserted if we have 281 * a GPIO for it, for now assume the device is configured 282 * for the fastest possible transition. 283 */ 284 285 return 0; 286 } 287 288 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, 289 int min_uV, int max_uV, unsigned *selector) 290 { 291 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 292 struct wm831x *wm831x = dcdc->wm831x; 293 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 294 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 295 int vsel, ret; 296 297 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV); 298 if (vsel < 0) 299 return vsel; 300 301 *selector = vsel; 302 303 /* If this value is already set then do a GPIO update if we can */ 304 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 305 return wm831x_buckv_set_dvs(rdev, 0); 306 307 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 308 return wm831x_buckv_set_dvs(rdev, 1); 309 310 /* Always set the ON status to the minimum voltage */ 311 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 312 if (ret < 0) 313 return ret; 314 dcdc->on_vsel = vsel; 315 316 if (!dcdc->dvs_gpio) 317 return ret; 318 319 /* Kick the voltage transition now */ 320 ret = wm831x_buckv_set_dvs(rdev, 0); 321 if (ret < 0) 322 return ret; 323 324 /* 325 * If this VSEL is higher than the last one we've seen then 326 * remember it as the DVS VSEL. This is optimised for CPUfreq 327 * usage where we want to get to the highest voltage very 328 * quickly. 329 */ 330 if (vsel > dcdc->dvs_vsel) { 331 ret = wm831x_set_bits(wm831x, dvs_reg, 332 WM831X_DC1_DVS_VSEL_MASK, 333 dcdc->dvs_vsel); 334 if (ret == 0) 335 dcdc->dvs_vsel = vsel; 336 else 337 dev_warn(wm831x->dev, 338 "Failed to set DCDC DVS VSEL: %d\n", ret); 339 } 340 341 return 0; 342 } 343 344 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 345 int uV) 346 { 347 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 348 struct wm831x *wm831x = dcdc->wm831x; 349 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 350 int vsel; 351 352 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV); 353 if (vsel < 0) 354 return vsel; 355 356 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 357 } 358 359 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) 360 { 361 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 362 363 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 364 return dcdc->dvs_vsel; 365 else 366 return dcdc->on_vsel; 367 } 368 369 /* Current limit options */ 370 static u16 wm831x_dcdc_ilim[] = { 371 125, 250, 375, 500, 625, 750, 875, 1000 372 }; 373 374 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 375 int min_uA, int max_uA) 376 { 377 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 378 struct wm831x *wm831x = dcdc->wm831x; 379 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 380 int i; 381 382 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 383 if ((min_uA <= wm831x_dcdc_ilim[i]) && 384 (wm831x_dcdc_ilim[i] <= max_uA)) 385 break; 386 } 387 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 388 return -EINVAL; 389 390 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, 391 i << WM831X_DC1_HC_THR_SHIFT); 392 } 393 394 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 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 val; 400 401 val = wm831x_reg_read(wm831x, reg); 402 if (val < 0) 403 return val; 404 405 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT; 406 return wm831x_dcdc_ilim[val]; 407 } 408 409 static struct regulator_ops wm831x_buckv_ops = { 410 .set_voltage = wm831x_buckv_set_voltage, 411 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 412 .list_voltage = wm831x_buckv_list_voltage, 413 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 414 .set_current_limit = wm831x_buckv_set_current_limit, 415 .get_current_limit = wm831x_buckv_get_current_limit, 416 417 .is_enabled = wm831x_dcdc_is_enabled, 418 .enable = wm831x_dcdc_enable, 419 .disable = wm831x_dcdc_disable, 420 .get_status = wm831x_dcdc_get_status, 421 .get_mode = wm831x_dcdc_get_mode, 422 .set_mode = wm831x_dcdc_set_mode, 423 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 424 }; 425 426 /* 427 * Set up DVS control. We just log errors since we can still run 428 * (with reduced performance) if we fail. 429 */ 430 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 431 struct wm831x_buckv_pdata *pdata) 432 { 433 struct wm831x *wm831x = dcdc->wm831x; 434 int ret; 435 u16 ctrl; 436 437 if (!pdata || !pdata->dvs_gpio) 438 return; 439 440 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); 441 if (ret < 0) { 442 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 443 dcdc->name, ret); 444 return; 445 } 446 447 /* gpiolib won't let us read the GPIO status so pick the higher 448 * of the two existing voltages so we take it as platform data. 449 */ 450 dcdc->dvs_gpio_state = pdata->dvs_init_state; 451 452 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); 453 if (ret < 0) { 454 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", 455 dcdc->name, ret); 456 gpio_free(pdata->dvs_gpio); 457 return; 458 } 459 460 dcdc->dvs_gpio = pdata->dvs_gpio; 461 462 switch (pdata->dvs_control_src) { 463 case 1: 464 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 465 break; 466 case 2: 467 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 468 break; 469 default: 470 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 471 pdata->dvs_control_src, dcdc->name); 472 return; 473 } 474 475 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 476 * to make bootstrapping a bit smoother. 477 */ 478 if (!dcdc->dvs_vsel) { 479 ret = wm831x_set_bits(wm831x, 480 dcdc->base + WM831X_DCDC_DVS_CONTROL, 481 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 482 if (ret == 0) 483 dcdc->dvs_vsel = dcdc->on_vsel; 484 else 485 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 486 ret); 487 } 488 489 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 490 WM831X_DC1_DVS_SRC_MASK, ctrl); 491 if (ret < 0) { 492 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 493 dcdc->name, ret); 494 } 495 } 496 497 static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 498 { 499 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 500 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 501 struct regulator_config config = { }; 502 int id; 503 struct wm831x_dcdc *dcdc; 504 struct resource *res; 505 int ret, irq; 506 507 if (pdata && pdata->wm831x_num) 508 id = (pdata->wm831x_num * 10) + 1; 509 else 510 id = 0; 511 id = pdev->id - id; 512 513 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 514 515 if (pdata == NULL || pdata->dcdc[id] == NULL) 516 return -ENODEV; 517 518 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 519 GFP_KERNEL); 520 if (dcdc == NULL) { 521 dev_err(&pdev->dev, "Unable to allocate private data\n"); 522 return -ENOMEM; 523 } 524 525 dcdc->wm831x = wm831x; 526 527 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 528 if (res == NULL) { 529 dev_err(&pdev->dev, "No I/O resource\n"); 530 ret = -EINVAL; 531 goto err; 532 } 533 dcdc->base = res->start; 534 535 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 536 dcdc->desc.name = dcdc->name; 537 dcdc->desc.id = id; 538 dcdc->desc.type = REGULATOR_VOLTAGE; 539 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 540 dcdc->desc.ops = &wm831x_buckv_ops; 541 dcdc->desc.owner = THIS_MODULE; 542 543 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 544 if (ret < 0) { 545 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 546 goto err; 547 } 548 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 549 550 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 551 if (ret < 0) { 552 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 553 goto err; 554 } 555 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 556 557 if (pdata->dcdc[id]) 558 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 559 560 config.dev = pdev->dev.parent; 561 config.init_data = pdata->dcdc[id]; 562 config.driver_data = dcdc; 563 564 dcdc->regulator = regulator_register(&dcdc->desc, &config); 565 if (IS_ERR(dcdc->regulator)) { 566 ret = PTR_ERR(dcdc->regulator); 567 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 568 id + 1, ret); 569 goto err; 570 } 571 572 irq = platform_get_irq_byname(pdev, "UV"); 573 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 574 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 575 if (ret != 0) { 576 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 577 irq, ret); 578 goto err_regulator; 579 } 580 581 irq = platform_get_irq_byname(pdev, "HC"); 582 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 583 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 584 if (ret != 0) { 585 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 586 irq, ret); 587 goto err_uv; 588 } 589 590 platform_set_drvdata(pdev, dcdc); 591 592 return 0; 593 594 err_uv: 595 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 596 err_regulator: 597 regulator_unregister(dcdc->regulator); 598 err: 599 if (dcdc->dvs_gpio) 600 gpio_free(dcdc->dvs_gpio); 601 return ret; 602 } 603 604 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 605 { 606 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 607 608 platform_set_drvdata(pdev, NULL); 609 610 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc); 611 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 612 regulator_unregister(dcdc->regulator); 613 if (dcdc->dvs_gpio) 614 gpio_free(dcdc->dvs_gpio); 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 struct regulator_ops wm831x_buckp_ops = { 683 .set_voltage = wm831x_buckp_set_voltage, 684 .get_voltage_sel = regulator_get_voltage_sel_regmap, 685 .list_voltage = wm831x_buckp_list_voltage, 686 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 687 688 .is_enabled = wm831x_dcdc_is_enabled, 689 .enable = wm831x_dcdc_enable, 690 .disable = wm831x_dcdc_disable, 691 .get_status = wm831x_dcdc_get_status, 692 .get_mode = wm831x_dcdc_get_mode, 693 .set_mode = wm831x_dcdc_set_mode, 694 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 695 }; 696 697 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 698 { 699 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 700 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 701 struct regulator_config config = { }; 702 int id; 703 struct wm831x_dcdc *dcdc; 704 struct resource *res; 705 int ret, irq; 706 707 if (pdata && pdata->wm831x_num) 708 id = (pdata->wm831x_num * 10) + 1; 709 else 710 id = 0; 711 id = pdev->id - id; 712 713 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 714 715 if (pdata == NULL || pdata->dcdc[id] == NULL) 716 return -ENODEV; 717 718 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 719 GFP_KERNEL); 720 if (dcdc == NULL) { 721 dev_err(&pdev->dev, "Unable to allocate private data\n"); 722 return -ENOMEM; 723 } 724 725 dcdc->wm831x = wm831x; 726 727 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 728 if (res == NULL) { 729 dev_err(&pdev->dev, "No I/O resource\n"); 730 ret = -EINVAL; 731 goto err; 732 } 733 dcdc->base = res->start; 734 735 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 736 dcdc->desc.name = dcdc->name; 737 dcdc->desc.id = id; 738 dcdc->desc.type = REGULATOR_VOLTAGE; 739 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 740 dcdc->desc.ops = &wm831x_buckp_ops; 741 dcdc->desc.owner = THIS_MODULE; 742 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 743 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK; 744 745 config.dev = pdev->dev.parent; 746 config.init_data = pdata->dcdc[id]; 747 config.driver_data = dcdc; 748 config.regmap = wm831x->regmap; 749 750 dcdc->regulator = regulator_register(&dcdc->desc, &config); 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 = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 760 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 761 if (ret != 0) { 762 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 763 irq, ret); 764 goto err_regulator; 765 } 766 767 platform_set_drvdata(pdev, dcdc); 768 769 return 0; 770 771 err_regulator: 772 regulator_unregister(dcdc->regulator); 773 err: 774 return ret; 775 } 776 777 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 778 { 779 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 780 781 platform_set_drvdata(pdev, NULL); 782 783 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 784 regulator_unregister(dcdc->regulator); 785 786 return 0; 787 } 788 789 static struct platform_driver wm831x_buckp_driver = { 790 .probe = wm831x_buckp_probe, 791 .remove = __devexit_p(wm831x_buckp_remove), 792 .driver = { 793 .name = "wm831x-buckp", 794 .owner = THIS_MODULE, 795 }, 796 }; 797 798 /* 799 * DCDC boost convertors 800 */ 801 802 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 803 { 804 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 805 struct wm831x *wm831x = dcdc->wm831x; 806 int ret; 807 808 /* First, check for errors */ 809 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 810 if (ret < 0) 811 return ret; 812 813 if (ret & (1 << rdev_get_id(rdev))) { 814 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 815 rdev_get_id(rdev) + 1); 816 return REGULATOR_STATUS_ERROR; 817 } 818 819 /* Is the regulator on? */ 820 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 821 if (ret < 0) 822 return ret; 823 if (ret & (1 << rdev_get_id(rdev))) 824 return REGULATOR_STATUS_ON; 825 else 826 return REGULATOR_STATUS_OFF; 827 } 828 829 static struct regulator_ops wm831x_boostp_ops = { 830 .get_status = wm831x_boostp_get_status, 831 832 .is_enabled = wm831x_dcdc_is_enabled, 833 .enable = wm831x_dcdc_enable, 834 .disable = wm831x_dcdc_disable, 835 }; 836 837 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 838 { 839 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 840 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 841 struct regulator_config config = { }; 842 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 843 struct wm831x_dcdc *dcdc; 844 struct resource *res; 845 int ret, irq; 846 847 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 848 849 if (pdata == NULL || pdata->dcdc[id] == NULL) 850 return -ENODEV; 851 852 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 853 if (dcdc == NULL) { 854 dev_err(&pdev->dev, "Unable to allocate private data\n"); 855 return -ENOMEM; 856 } 857 858 dcdc->wm831x = wm831x; 859 860 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 861 if (res == NULL) { 862 dev_err(&pdev->dev, "No I/O resource\n"); 863 ret = -EINVAL; 864 goto err; 865 } 866 dcdc->base = res->start; 867 868 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 869 dcdc->desc.name = dcdc->name; 870 dcdc->desc.id = id; 871 dcdc->desc.type = REGULATOR_VOLTAGE; 872 dcdc->desc.ops = &wm831x_boostp_ops; 873 dcdc->desc.owner = THIS_MODULE; 874 875 config.dev = pdev->dev.parent; 876 config.init_data = pdata->dcdc[id]; 877 config.driver_data = dcdc; 878 879 dcdc->regulator = regulator_register(&dcdc->desc, &config); 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 = request_threaded_irq(irq, NULL, 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 return ret; 905 } 906 907 static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 908 { 909 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 910 911 platform_set_drvdata(pdev, NULL); 912 913 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 914 regulator_unregister(dcdc->regulator); 915 916 return 0; 917 } 918 919 static struct platform_driver wm831x_boostp_driver = { 920 .probe = wm831x_boostp_probe, 921 .remove = __devexit_p(wm831x_boostp_remove), 922 .driver = { 923 .name = "wm831x-boostp", 924 .owner = THIS_MODULE, 925 }, 926 }; 927 928 /* 929 * External Power Enable 930 * 931 * These aren't actually DCDCs but look like them in hardware so share 932 * code. 933 */ 934 935 #define WM831X_EPE_BASE 6 936 937 static struct regulator_ops wm831x_epe_ops = { 938 .is_enabled = wm831x_dcdc_is_enabled, 939 .enable = wm831x_dcdc_enable, 940 .disable = wm831x_dcdc_disable, 941 .get_status = wm831x_dcdc_get_status, 942 }; 943 944 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 945 { 946 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 947 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 948 struct regulator_config config = { }; 949 int id = pdev->id % ARRAY_SIZE(pdata->epe); 950 struct wm831x_dcdc *dcdc; 951 int ret; 952 953 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 954 955 if (pdata == NULL || pdata->epe[id] == NULL) 956 return -ENODEV; 957 958 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 959 if (dcdc == NULL) { 960 dev_err(&pdev->dev, "Unable to allocate private data\n"); 961 return -ENOMEM; 962 } 963 964 dcdc->wm831x = wm831x; 965 966 /* For current parts this is correct; probably need to revisit 967 * in future. 968 */ 969 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 970 dcdc->desc.name = dcdc->name; 971 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 972 dcdc->desc.ops = &wm831x_epe_ops; 973 dcdc->desc.type = REGULATOR_VOLTAGE; 974 dcdc->desc.owner = THIS_MODULE; 975 976 config.dev = pdev->dev.parent; 977 config.init_data = pdata->epe[id]; 978 config.driver_data = dcdc; 979 980 dcdc->regulator = regulator_register(&dcdc->desc, &config); 981 if (IS_ERR(dcdc->regulator)) { 982 ret = PTR_ERR(dcdc->regulator); 983 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 984 id + 1, ret); 985 goto err; 986 } 987 988 platform_set_drvdata(pdev, dcdc); 989 990 return 0; 991 992 err: 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 regulator_unregister(dcdc->regulator); 1002 1003 return 0; 1004 } 1005 1006 static struct platform_driver wm831x_epe_driver = { 1007 .probe = wm831x_epe_probe, 1008 .remove = __devexit_p(wm831x_epe_remove), 1009 .driver = { 1010 .name = "wm831x-epe", 1011 .owner = THIS_MODULE, 1012 }, 1013 }; 1014 1015 static int __init wm831x_dcdc_init(void) 1016 { 1017 int ret; 1018 ret = platform_driver_register(&wm831x_buckv_driver); 1019 if (ret != 0) 1020 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1021 1022 ret = platform_driver_register(&wm831x_buckp_driver); 1023 if (ret != 0) 1024 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1025 1026 ret = platform_driver_register(&wm831x_boostp_driver); 1027 if (ret != 0) 1028 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1029 1030 ret = platform_driver_register(&wm831x_epe_driver); 1031 if (ret != 0) 1032 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1033 1034 return 0; 1035 } 1036 subsys_initcall(wm831x_dcdc_init); 1037 1038 static void __exit wm831x_dcdc_exit(void) 1039 { 1040 platform_driver_unregister(&wm831x_epe_driver); 1041 platform_driver_unregister(&wm831x_boostp_driver); 1042 platform_driver_unregister(&wm831x_buckp_driver); 1043 platform_driver_unregister(&wm831x_buckv_driver); 1044 } 1045 module_exit(wm831x_dcdc_exit); 1046 1047 /* Module information */ 1048 MODULE_AUTHOR("Mark Brown"); 1049 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1050 MODULE_LICENSE("GPL"); 1051 MODULE_ALIAS("platform:wm831x-buckv"); 1052 MODULE_ALIAS("platform:wm831x-buckp"); 1053 MODULE_ALIAS("platform:wm831x-epe"); 1054