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 (max_uA <= wm831x_dcdc_ilim[i]) 384 break; 385 } 386 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 387 return -EINVAL; 388 389 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); 390 } 391 392 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 393 { 394 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 395 struct wm831x *wm831x = dcdc->wm831x; 396 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 397 int val; 398 399 val = wm831x_reg_read(wm831x, reg); 400 if (val < 0) 401 return val; 402 403 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; 404 } 405 406 static struct regulator_ops wm831x_buckv_ops = { 407 .set_voltage = wm831x_buckv_set_voltage, 408 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 409 .list_voltage = wm831x_buckv_list_voltage, 410 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 411 .set_current_limit = wm831x_buckv_set_current_limit, 412 .get_current_limit = wm831x_buckv_get_current_limit, 413 414 .is_enabled = wm831x_dcdc_is_enabled, 415 .enable = wm831x_dcdc_enable, 416 .disable = wm831x_dcdc_disable, 417 .get_status = wm831x_dcdc_get_status, 418 .get_mode = wm831x_dcdc_get_mode, 419 .set_mode = wm831x_dcdc_set_mode, 420 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 421 }; 422 423 /* 424 * Set up DVS control. We just log errors since we can still run 425 * (with reduced performance) if we fail. 426 */ 427 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 428 struct wm831x_buckv_pdata *pdata) 429 { 430 struct wm831x *wm831x = dcdc->wm831x; 431 int ret; 432 u16 ctrl; 433 434 if (!pdata || !pdata->dvs_gpio) 435 return; 436 437 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); 438 if (ret < 0) { 439 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 440 dcdc->name, ret); 441 return; 442 } 443 444 /* gpiolib won't let us read the GPIO status so pick the higher 445 * of the two existing voltages so we take it as platform data. 446 */ 447 dcdc->dvs_gpio_state = pdata->dvs_init_state; 448 449 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); 450 if (ret < 0) { 451 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", 452 dcdc->name, ret); 453 gpio_free(pdata->dvs_gpio); 454 return; 455 } 456 457 dcdc->dvs_gpio = pdata->dvs_gpio; 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 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 473 * to make bootstrapping a bit smoother. 474 */ 475 if (!dcdc->dvs_vsel) { 476 ret = wm831x_set_bits(wm831x, 477 dcdc->base + WM831X_DCDC_DVS_CONTROL, 478 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 479 if (ret == 0) 480 dcdc->dvs_vsel = dcdc->on_vsel; 481 else 482 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 483 ret); 484 } 485 486 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 487 WM831X_DC1_DVS_SRC_MASK, ctrl); 488 if (ret < 0) { 489 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 490 dcdc->name, ret); 491 } 492 } 493 494 static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 495 { 496 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 497 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 498 struct regulator_config config = { }; 499 int id; 500 struct wm831x_dcdc *dcdc; 501 struct resource *res; 502 int ret, irq; 503 504 if (pdata && pdata->wm831x_num) 505 id = (pdata->wm831x_num * 10) + 1; 506 else 507 id = 0; 508 id = pdev->id - id; 509 510 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 511 512 if (pdata == NULL || pdata->dcdc[id] == NULL) 513 return -ENODEV; 514 515 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 516 GFP_KERNEL); 517 if (dcdc == NULL) { 518 dev_err(&pdev->dev, "Unable to allocate private data\n"); 519 return -ENOMEM; 520 } 521 522 dcdc->wm831x = wm831x; 523 524 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 525 if (res == NULL) { 526 dev_err(&pdev->dev, "No I/O resource\n"); 527 ret = -EINVAL; 528 goto err; 529 } 530 dcdc->base = res->start; 531 532 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 533 dcdc->desc.name = dcdc->name; 534 dcdc->desc.id = id; 535 dcdc->desc.type = REGULATOR_VOLTAGE; 536 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 537 dcdc->desc.ops = &wm831x_buckv_ops; 538 dcdc->desc.owner = THIS_MODULE; 539 540 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 541 if (ret < 0) { 542 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 543 goto err; 544 } 545 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 546 547 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 548 if (ret < 0) { 549 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 550 goto err; 551 } 552 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 553 554 if (pdata->dcdc[id]) 555 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 556 557 config.dev = pdev->dev.parent; 558 config.init_data = pdata->dcdc[id]; 559 config.driver_data = dcdc; 560 561 dcdc->regulator = regulator_register(&dcdc->desc, &config); 562 if (IS_ERR(dcdc->regulator)) { 563 ret = PTR_ERR(dcdc->regulator); 564 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 565 id + 1, ret); 566 goto err; 567 } 568 569 irq = platform_get_irq_byname(pdev, "UV"); 570 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 571 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 572 if (ret != 0) { 573 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 574 irq, ret); 575 goto err_regulator; 576 } 577 578 irq = platform_get_irq_byname(pdev, "HC"); 579 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 580 IRQF_TRIGGER_RISING, dcdc->name, 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 free_irq(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 return ret; 599 } 600 601 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 602 { 603 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 604 605 platform_set_drvdata(pdev, NULL); 606 607 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc); 608 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 609 regulator_unregister(dcdc->regulator); 610 if (dcdc->dvs_gpio) 611 gpio_free(dcdc->dvs_gpio); 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 struct regulator_config config = { }; 713 int id; 714 struct wm831x_dcdc *dcdc; 715 struct resource *res; 716 int ret, irq; 717 718 if (pdata && pdata->wm831x_num) 719 id = (pdata->wm831x_num * 10) + 1; 720 else 721 id = 0; 722 id = pdev->id - id; 723 724 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 725 726 if (pdata == NULL || pdata->dcdc[id] == NULL) 727 return -ENODEV; 728 729 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 730 GFP_KERNEL); 731 if (dcdc == NULL) { 732 dev_err(&pdev->dev, "Unable to allocate private data\n"); 733 return -ENOMEM; 734 } 735 736 dcdc->wm831x = wm831x; 737 738 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 739 if (res == NULL) { 740 dev_err(&pdev->dev, "No I/O resource\n"); 741 ret = -EINVAL; 742 goto err; 743 } 744 dcdc->base = res->start; 745 746 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 747 dcdc->desc.name = dcdc->name; 748 dcdc->desc.id = id; 749 dcdc->desc.type = REGULATOR_VOLTAGE; 750 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 751 dcdc->desc.ops = &wm831x_buckp_ops; 752 dcdc->desc.owner = THIS_MODULE; 753 754 config.dev = pdev->dev.parent; 755 config.init_data = pdata->dcdc[id]; 756 config.driver_data = dcdc; 757 758 dcdc->regulator = regulator_register(&dcdc->desc, &config); 759 if (IS_ERR(dcdc->regulator)) { 760 ret = PTR_ERR(dcdc->regulator); 761 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 762 id + 1, ret); 763 goto err; 764 } 765 766 irq = platform_get_irq_byname(pdev, "UV"); 767 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 768 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 769 if (ret != 0) { 770 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 771 irq, ret); 772 goto err_regulator; 773 } 774 775 platform_set_drvdata(pdev, dcdc); 776 777 return 0; 778 779 err_regulator: 780 regulator_unregister(dcdc->regulator); 781 err: 782 return ret; 783 } 784 785 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 786 { 787 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 788 789 platform_set_drvdata(pdev, NULL); 790 791 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 792 regulator_unregister(dcdc->regulator); 793 794 return 0; 795 } 796 797 static struct platform_driver wm831x_buckp_driver = { 798 .probe = wm831x_buckp_probe, 799 .remove = __devexit_p(wm831x_buckp_remove), 800 .driver = { 801 .name = "wm831x-buckp", 802 .owner = THIS_MODULE, 803 }, 804 }; 805 806 /* 807 * DCDC boost convertors 808 */ 809 810 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 811 { 812 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 813 struct wm831x *wm831x = dcdc->wm831x; 814 int ret; 815 816 /* First, check for errors */ 817 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 818 if (ret < 0) 819 return ret; 820 821 if (ret & (1 << rdev_get_id(rdev))) { 822 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 823 rdev_get_id(rdev) + 1); 824 return REGULATOR_STATUS_ERROR; 825 } 826 827 /* Is the regulator on? */ 828 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 829 if (ret < 0) 830 return ret; 831 if (ret & (1 << rdev_get_id(rdev))) 832 return REGULATOR_STATUS_ON; 833 else 834 return REGULATOR_STATUS_OFF; 835 } 836 837 static struct regulator_ops wm831x_boostp_ops = { 838 .get_status = wm831x_boostp_get_status, 839 840 .is_enabled = wm831x_dcdc_is_enabled, 841 .enable = wm831x_dcdc_enable, 842 .disable = wm831x_dcdc_disable, 843 }; 844 845 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 846 { 847 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 848 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 849 struct regulator_config config = { }; 850 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 851 struct wm831x_dcdc *dcdc; 852 struct resource *res; 853 int ret, irq; 854 855 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 856 857 if (pdata == NULL || pdata->dcdc[id] == NULL) 858 return -ENODEV; 859 860 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 861 if (dcdc == NULL) { 862 dev_err(&pdev->dev, "Unable to allocate private data\n"); 863 return -ENOMEM; 864 } 865 866 dcdc->wm831x = wm831x; 867 868 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 869 if (res == NULL) { 870 dev_err(&pdev->dev, "No I/O resource\n"); 871 ret = -EINVAL; 872 goto err; 873 } 874 dcdc->base = res->start; 875 876 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 877 dcdc->desc.name = dcdc->name; 878 dcdc->desc.id = id; 879 dcdc->desc.type = REGULATOR_VOLTAGE; 880 dcdc->desc.ops = &wm831x_boostp_ops; 881 dcdc->desc.owner = THIS_MODULE; 882 883 config.dev = pdev->dev.parent; 884 config.init_data = pdata->dcdc[id]; 885 config.driver_data = dcdc; 886 887 dcdc->regulator = regulator_register(&dcdc->desc, &config); 888 if (IS_ERR(dcdc->regulator)) { 889 ret = PTR_ERR(dcdc->regulator); 890 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 891 id + 1, ret); 892 goto err; 893 } 894 895 irq = platform_get_irq_byname(pdev, "UV"); 896 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 897 IRQF_TRIGGER_RISING, dcdc->name, 898 dcdc); 899 if (ret != 0) { 900 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 901 irq, ret); 902 goto err_regulator; 903 } 904 905 platform_set_drvdata(pdev, dcdc); 906 907 return 0; 908 909 err_regulator: 910 regulator_unregister(dcdc->regulator); 911 err: 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); 923 924 return 0; 925 } 926 927 static struct platform_driver wm831x_boostp_driver = { 928 .probe = wm831x_boostp_probe, 929 .remove = __devexit_p(wm831x_boostp_remove), 930 .driver = { 931 .name = "wm831x-boostp", 932 .owner = THIS_MODULE, 933 }, 934 }; 935 936 /* 937 * External Power Enable 938 * 939 * These aren't actually DCDCs but look like them in hardware so share 940 * code. 941 */ 942 943 #define WM831X_EPE_BASE 6 944 945 static struct regulator_ops wm831x_epe_ops = { 946 .is_enabled = wm831x_dcdc_is_enabled, 947 .enable = wm831x_dcdc_enable, 948 .disable = wm831x_dcdc_disable, 949 .get_status = wm831x_dcdc_get_status, 950 }; 951 952 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 953 { 954 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 955 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 956 struct regulator_config config = { }; 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 = devm_kzalloc(&pdev->dev, 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 config.dev = pdev->dev.parent; 985 config.init_data = pdata->epe[id]; 986 config.driver_data = dcdc; 987 988 dcdc->regulator = regulator_register(&dcdc->desc, &config); 989 if (IS_ERR(dcdc->regulator)) { 990 ret = PTR_ERR(dcdc->regulator); 991 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 992 id + 1, ret); 993 goto err; 994 } 995 996 platform_set_drvdata(pdev, dcdc); 997 998 return 0; 999 1000 err: 1001 return ret; 1002 } 1003 1004 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 1005 { 1006 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 1007 1008 platform_set_drvdata(pdev, NULL); 1009 regulator_unregister(dcdc->regulator); 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 MODULE_ALIAS("platform:wm831x-epe"); 1062