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 9 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 char supply_name[WM831X_DCDC_MAX_NAME]; 54 struct regulator_desc desc; 55 int base; 56 struct wm831x *wm831x; 57 struct regulator_dev *regulator; 58 int dvs_gpio; 59 int dvs_gpio_state; 60 int on_vsel; 61 int dvs_vsel; 62 }; 63 64 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) 65 66 { 67 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 68 struct wm831x *wm831x = dcdc->wm831x; 69 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 70 int val; 71 72 val = wm831x_reg_read(wm831x, reg); 73 if (val < 0) 74 return val; 75 76 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; 77 78 switch (val) { 79 case WM831X_DCDC_MODE_FAST: 80 return REGULATOR_MODE_FAST; 81 case WM831X_DCDC_MODE_NORMAL: 82 return REGULATOR_MODE_NORMAL; 83 case WM831X_DCDC_MODE_STANDBY: 84 return REGULATOR_MODE_STANDBY; 85 case WM831X_DCDC_MODE_IDLE: 86 return REGULATOR_MODE_IDLE; 87 default: 88 BUG(); 89 return -EINVAL; 90 } 91 } 92 93 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 94 unsigned int mode) 95 { 96 int val; 97 98 switch (mode) { 99 case REGULATOR_MODE_FAST: 100 val = WM831X_DCDC_MODE_FAST; 101 break; 102 case REGULATOR_MODE_NORMAL: 103 val = WM831X_DCDC_MODE_NORMAL; 104 break; 105 case REGULATOR_MODE_STANDBY: 106 val = WM831X_DCDC_MODE_STANDBY; 107 break; 108 case REGULATOR_MODE_IDLE: 109 val = WM831X_DCDC_MODE_IDLE; 110 break; 111 default: 112 return -EINVAL; 113 } 114 115 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 116 val << WM831X_DC1_ON_MODE_SHIFT); 117 } 118 119 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 120 { 121 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 122 struct wm831x *wm831x = dcdc->wm831x; 123 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 124 125 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 126 } 127 128 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 129 unsigned int mode) 130 { 131 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 132 struct wm831x *wm831x = dcdc->wm831x; 133 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 134 135 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 136 } 137 138 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 139 { 140 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 141 struct wm831x *wm831x = dcdc->wm831x; 142 int ret; 143 144 /* First, check for errors */ 145 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 146 if (ret < 0) 147 return ret; 148 149 if (ret & (1 << rdev_get_id(rdev))) { 150 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 151 rdev_get_id(rdev) + 1); 152 return REGULATOR_STATUS_ERROR; 153 } 154 155 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 156 if (rdev_get_id(rdev) < 2) { 157 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 158 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 159 rdev_get_id(rdev) + 1); 160 return REGULATOR_STATUS_ERROR; 161 } 162 163 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 164 dev_dbg(wm831x->dev, "DCDC%d over current\n", 165 rdev_get_id(rdev) + 1); 166 return REGULATOR_STATUS_ERROR; 167 } 168 } 169 170 /* Is the regulator on? */ 171 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 172 if (ret < 0) 173 return ret; 174 if (!(ret & (1 << rdev_get_id(rdev)))) 175 return REGULATOR_STATUS_OFF; 176 177 /* TODO: When we handle hardware control modes so we can report the 178 * current mode. */ 179 return REGULATOR_STATUS_ON; 180 } 181 182 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 183 { 184 struct wm831x_dcdc *dcdc = data; 185 186 regulator_notifier_call_chain(dcdc->regulator, 187 REGULATOR_EVENT_UNDER_VOLTAGE, 188 NULL); 189 190 return IRQ_HANDLED; 191 } 192 193 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 194 { 195 struct wm831x_dcdc *dcdc = data; 196 197 regulator_notifier_call_chain(dcdc->regulator, 198 REGULATOR_EVENT_OVER_CURRENT, 199 NULL); 200 201 return IRQ_HANDLED; 202 } 203 204 /* 205 * BUCKV specifics 206 */ 207 208 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 209 unsigned selector) 210 { 211 if (selector <= 0x8) 212 return 600000; 213 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 214 return 600000 + ((selector - 0x8) * 12500); 215 return -EINVAL; 216 } 217 218 static int wm831x_buckv_map_voltage(struct regulator_dev *rdev, 219 int min_uV, int max_uV) 220 { 221 u16 vsel; 222 223 if (min_uV < 600000) 224 vsel = 0; 225 else if (min_uV <= 1800000) 226 vsel = ((min_uV - 600000) / 12500) + 8; 227 else 228 return -EINVAL; 229 230 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 231 return -EINVAL; 232 233 return vsel; 234 } 235 236 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 237 { 238 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 239 240 if (state == dcdc->dvs_gpio_state) 241 return 0; 242 243 dcdc->dvs_gpio_state = state; 244 gpio_set_value(dcdc->dvs_gpio, state); 245 246 /* Should wait for DVS state change to be asserted if we have 247 * a GPIO for it, for now assume the device is configured 248 * for the fastest possible transition. 249 */ 250 251 return 0; 252 } 253 254 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev, 255 unsigned vsel) 256 { 257 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 258 struct wm831x *wm831x = dcdc->wm831x; 259 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 260 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 261 int ret; 262 263 /* If this value is already set then do a GPIO update if we can */ 264 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 265 return wm831x_buckv_set_dvs(rdev, 0); 266 267 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 268 return wm831x_buckv_set_dvs(rdev, 1); 269 270 /* Always set the ON status to the minimum voltage */ 271 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 272 if (ret < 0) 273 return ret; 274 dcdc->on_vsel = vsel; 275 276 if (!dcdc->dvs_gpio) 277 return ret; 278 279 /* Kick the voltage transition now */ 280 ret = wm831x_buckv_set_dvs(rdev, 0); 281 if (ret < 0) 282 return ret; 283 284 /* 285 * If this VSEL is higher than the last one we've seen then 286 * remember it as the DVS VSEL. This is optimised for CPUfreq 287 * usage where we want to get to the highest voltage very 288 * quickly. 289 */ 290 if (vsel > dcdc->dvs_vsel) { 291 ret = wm831x_set_bits(wm831x, dvs_reg, 292 WM831X_DC1_DVS_VSEL_MASK, 293 dcdc->dvs_vsel); 294 if (ret == 0) 295 dcdc->dvs_vsel = vsel; 296 else 297 dev_warn(wm831x->dev, 298 "Failed to set DCDC DVS VSEL: %d\n", ret); 299 } 300 301 return 0; 302 } 303 304 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 305 int uV) 306 { 307 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 308 struct wm831x *wm831x = dcdc->wm831x; 309 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 310 int vsel; 311 312 vsel = wm831x_buckv_map_voltage(rdev, uV, uV); 313 if (vsel < 0) 314 return vsel; 315 316 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 317 } 318 319 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) 320 { 321 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 322 323 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 324 return dcdc->dvs_vsel; 325 else 326 return dcdc->on_vsel; 327 } 328 329 /* Current limit options */ 330 static u16 wm831x_dcdc_ilim[] = { 331 125, 250, 375, 500, 625, 750, 875, 1000 332 }; 333 334 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 335 int min_uA, int max_uA) 336 { 337 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 338 struct wm831x *wm831x = dcdc->wm831x; 339 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 340 int i; 341 342 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 343 if ((min_uA <= wm831x_dcdc_ilim[i]) && 344 (wm831x_dcdc_ilim[i] <= max_uA)) 345 break; 346 } 347 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 348 return -EINVAL; 349 350 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, 351 i << WM831X_DC1_HC_THR_SHIFT); 352 } 353 354 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 355 { 356 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 357 struct wm831x *wm831x = dcdc->wm831x; 358 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 359 int val; 360 361 val = wm831x_reg_read(wm831x, reg); 362 if (val < 0) 363 return val; 364 365 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT; 366 return wm831x_dcdc_ilim[val]; 367 } 368 369 static struct regulator_ops wm831x_buckv_ops = { 370 .set_voltage_sel = wm831x_buckv_set_voltage_sel, 371 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 372 .list_voltage = wm831x_buckv_list_voltage, 373 .map_voltage = wm831x_buckv_map_voltage, 374 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 375 .set_current_limit = wm831x_buckv_set_current_limit, 376 .get_current_limit = wm831x_buckv_get_current_limit, 377 378 .is_enabled = regulator_is_enabled_regmap, 379 .enable = regulator_enable_regmap, 380 .disable = regulator_disable_regmap, 381 .get_status = wm831x_dcdc_get_status, 382 .get_mode = wm831x_dcdc_get_mode, 383 .set_mode = wm831x_dcdc_set_mode, 384 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 385 }; 386 387 /* 388 * Set up DVS control. We just log errors since we can still run 389 * (with reduced performance) if we fail. 390 */ 391 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 392 struct wm831x_buckv_pdata *pdata) 393 { 394 struct wm831x *wm831x = dcdc->wm831x; 395 int ret; 396 u16 ctrl; 397 398 if (!pdata || !pdata->dvs_gpio) 399 return; 400 401 /* gpiolib won't let us read the GPIO status so pick the higher 402 * of the two existing voltages so we take it as platform data. 403 */ 404 dcdc->dvs_gpio_state = pdata->dvs_init_state; 405 406 ret = gpio_request_one(pdata->dvs_gpio, 407 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0, 408 "DCDC DVS"); 409 if (ret < 0) { 410 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 411 dcdc->name, ret); 412 return; 413 } 414 415 dcdc->dvs_gpio = pdata->dvs_gpio; 416 417 switch (pdata->dvs_control_src) { 418 case 1: 419 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 420 break; 421 case 2: 422 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 423 break; 424 default: 425 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 426 pdata->dvs_control_src, dcdc->name); 427 return; 428 } 429 430 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 431 * to make bootstrapping a bit smoother. 432 */ 433 if (!dcdc->dvs_vsel) { 434 ret = wm831x_set_bits(wm831x, 435 dcdc->base + WM831X_DCDC_DVS_CONTROL, 436 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 437 if (ret == 0) 438 dcdc->dvs_vsel = dcdc->on_vsel; 439 else 440 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 441 ret); 442 } 443 444 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 445 WM831X_DC1_DVS_SRC_MASK, ctrl); 446 if (ret < 0) { 447 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 448 dcdc->name, ret); 449 } 450 } 451 452 static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 453 { 454 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 455 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 456 struct regulator_config config = { }; 457 int id; 458 struct wm831x_dcdc *dcdc; 459 struct resource *res; 460 int ret, irq; 461 462 if (pdata && pdata->wm831x_num) 463 id = (pdata->wm831x_num * 10) + 1; 464 else 465 id = 0; 466 id = pdev->id - id; 467 468 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 469 470 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 471 GFP_KERNEL); 472 if (dcdc == NULL) { 473 dev_err(&pdev->dev, "Unable to allocate private data\n"); 474 return -ENOMEM; 475 } 476 477 dcdc->wm831x = wm831x; 478 479 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 480 if (res == NULL) { 481 dev_err(&pdev->dev, "No I/O resource\n"); 482 ret = -EINVAL; 483 goto err; 484 } 485 dcdc->base = res->start; 486 487 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 488 dcdc->desc.name = dcdc->name; 489 490 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 491 "DC%dVDD", id + 1); 492 dcdc->desc.supply_name = dcdc->supply_name; 493 494 dcdc->desc.id = id; 495 dcdc->desc.type = REGULATOR_VOLTAGE; 496 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 497 dcdc->desc.ops = &wm831x_buckv_ops; 498 dcdc->desc.owner = THIS_MODULE; 499 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 500 dcdc->desc.enable_mask = 1 << id; 501 502 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 503 if (ret < 0) { 504 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 505 goto err; 506 } 507 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 508 509 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 510 if (ret < 0) { 511 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 512 goto err; 513 } 514 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 515 516 if (pdata && pdata->dcdc[id]) 517 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 518 519 config.dev = pdev->dev.parent; 520 if (pdata) 521 config.init_data = pdata->dcdc[id]; 522 config.driver_data = dcdc; 523 config.regmap = wm831x->regmap; 524 525 dcdc->regulator = regulator_register(&dcdc->desc, &config); 526 if (IS_ERR(dcdc->regulator)) { 527 ret = PTR_ERR(dcdc->regulator); 528 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 529 id + 1, ret); 530 goto err; 531 } 532 533 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 534 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 535 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 536 if (ret != 0) { 537 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 538 irq, ret); 539 goto err_regulator; 540 } 541 542 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")); 543 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 544 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 545 if (ret != 0) { 546 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 547 irq, ret); 548 goto err_uv; 549 } 550 551 platform_set_drvdata(pdev, dcdc); 552 553 return 0; 554 555 err_uv: 556 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")), 557 dcdc); 558 err_regulator: 559 regulator_unregister(dcdc->regulator); 560 err: 561 if (dcdc->dvs_gpio) 562 gpio_free(dcdc->dvs_gpio); 563 return ret; 564 } 565 566 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 567 { 568 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 569 struct wm831x *wm831x = dcdc->wm831x; 570 571 platform_set_drvdata(pdev, NULL); 572 573 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")), 574 dcdc); 575 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")), 576 dcdc); 577 regulator_unregister(dcdc->regulator); 578 if (dcdc->dvs_gpio) 579 gpio_free(dcdc->dvs_gpio); 580 581 return 0; 582 } 583 584 static struct platform_driver wm831x_buckv_driver = { 585 .probe = wm831x_buckv_probe, 586 .remove = __devexit_p(wm831x_buckv_remove), 587 .driver = { 588 .name = "wm831x-buckv", 589 .owner = THIS_MODULE, 590 }, 591 }; 592 593 /* 594 * BUCKP specifics 595 */ 596 597 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV) 598 { 599 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 600 struct wm831x *wm831x = dcdc->wm831x; 601 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 602 int sel; 603 604 sel = regulator_map_voltage_linear(rdev, uV, uV); 605 if (sel < 0) 606 return sel; 607 608 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel); 609 } 610 611 static struct regulator_ops wm831x_buckp_ops = { 612 .set_voltage_sel = regulator_set_voltage_sel_regmap, 613 .get_voltage_sel = regulator_get_voltage_sel_regmap, 614 .list_voltage = regulator_list_voltage_linear, 615 .map_voltage = regulator_map_voltage_linear, 616 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 617 618 .is_enabled = regulator_is_enabled_regmap, 619 .enable = regulator_enable_regmap, 620 .disable = regulator_disable_regmap, 621 .get_status = wm831x_dcdc_get_status, 622 .get_mode = wm831x_dcdc_get_mode, 623 .set_mode = wm831x_dcdc_set_mode, 624 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 625 }; 626 627 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 628 { 629 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 630 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 631 struct regulator_config config = { }; 632 int id; 633 struct wm831x_dcdc *dcdc; 634 struct resource *res; 635 int ret, irq; 636 637 if (pdata && pdata->wm831x_num) 638 id = (pdata->wm831x_num * 10) + 1; 639 else 640 id = 0; 641 id = pdev->id - id; 642 643 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 644 645 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 646 GFP_KERNEL); 647 if (dcdc == NULL) { 648 dev_err(&pdev->dev, "Unable to allocate private data\n"); 649 return -ENOMEM; 650 } 651 652 dcdc->wm831x = wm831x; 653 654 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 655 if (res == NULL) { 656 dev_err(&pdev->dev, "No I/O resource\n"); 657 ret = -EINVAL; 658 goto err; 659 } 660 dcdc->base = res->start; 661 662 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 663 dcdc->desc.name = dcdc->name; 664 665 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 666 "DC%dVDD", id + 1); 667 dcdc->desc.supply_name = dcdc->supply_name; 668 669 dcdc->desc.id = id; 670 dcdc->desc.type = REGULATOR_VOLTAGE; 671 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 672 dcdc->desc.ops = &wm831x_buckp_ops; 673 dcdc->desc.owner = THIS_MODULE; 674 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 675 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK; 676 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 677 dcdc->desc.enable_mask = 1 << id; 678 dcdc->desc.min_uV = 850000; 679 dcdc->desc.uV_step = 25000; 680 681 config.dev = pdev->dev.parent; 682 if (pdata) 683 config.init_data = pdata->dcdc[id]; 684 config.driver_data = dcdc; 685 config.regmap = wm831x->regmap; 686 687 dcdc->regulator = regulator_register(&dcdc->desc, &config); 688 if (IS_ERR(dcdc->regulator)) { 689 ret = PTR_ERR(dcdc->regulator); 690 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 691 id + 1, ret); 692 goto err; 693 } 694 695 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 696 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 697 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 698 if (ret != 0) { 699 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 700 irq, ret); 701 goto err_regulator; 702 } 703 704 platform_set_drvdata(pdev, dcdc); 705 706 return 0; 707 708 err_regulator: 709 regulator_unregister(dcdc->regulator); 710 err: 711 return ret; 712 } 713 714 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 715 { 716 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 717 718 platform_set_drvdata(pdev, NULL); 719 720 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")), 721 dcdc); 722 regulator_unregister(dcdc->regulator); 723 724 return 0; 725 } 726 727 static struct platform_driver wm831x_buckp_driver = { 728 .probe = wm831x_buckp_probe, 729 .remove = __devexit_p(wm831x_buckp_remove), 730 .driver = { 731 .name = "wm831x-buckp", 732 .owner = THIS_MODULE, 733 }, 734 }; 735 736 /* 737 * DCDC boost convertors 738 */ 739 740 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 741 { 742 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 743 struct wm831x *wm831x = dcdc->wm831x; 744 int ret; 745 746 /* First, check for errors */ 747 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 748 if (ret < 0) 749 return ret; 750 751 if (ret & (1 << rdev_get_id(rdev))) { 752 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 753 rdev_get_id(rdev) + 1); 754 return REGULATOR_STATUS_ERROR; 755 } 756 757 /* Is the regulator on? */ 758 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 759 if (ret < 0) 760 return ret; 761 if (ret & (1 << rdev_get_id(rdev))) 762 return REGULATOR_STATUS_ON; 763 else 764 return REGULATOR_STATUS_OFF; 765 } 766 767 static struct regulator_ops wm831x_boostp_ops = { 768 .get_status = wm831x_boostp_get_status, 769 770 .is_enabled = regulator_is_enabled_regmap, 771 .enable = regulator_enable_regmap, 772 .disable = regulator_disable_regmap, 773 }; 774 775 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 776 { 777 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 778 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 779 struct regulator_config config = { }; 780 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 781 struct wm831x_dcdc *dcdc; 782 struct resource *res; 783 int ret, irq; 784 785 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 786 787 if (pdata == NULL || pdata->dcdc[id] == NULL) 788 return -ENODEV; 789 790 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 791 if (dcdc == NULL) { 792 dev_err(&pdev->dev, "Unable to allocate private data\n"); 793 return -ENOMEM; 794 } 795 796 dcdc->wm831x = wm831x; 797 798 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 799 if (res == NULL) { 800 dev_err(&pdev->dev, "No I/O resource\n"); 801 ret = -EINVAL; 802 goto err; 803 } 804 dcdc->base = res->start; 805 806 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 807 dcdc->desc.name = dcdc->name; 808 dcdc->desc.id = id; 809 dcdc->desc.type = REGULATOR_VOLTAGE; 810 dcdc->desc.ops = &wm831x_boostp_ops; 811 dcdc->desc.owner = THIS_MODULE; 812 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 813 dcdc->desc.enable_mask = 1 << id; 814 815 config.dev = pdev->dev.parent; 816 if (pdata) 817 config.init_data = pdata->dcdc[id]; 818 config.driver_data = dcdc; 819 config.regmap = wm831x->regmap; 820 821 dcdc->regulator = regulator_register(&dcdc->desc, &config); 822 if (IS_ERR(dcdc->regulator)) { 823 ret = PTR_ERR(dcdc->regulator); 824 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 825 id + 1, ret); 826 goto err; 827 } 828 829 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 830 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 831 IRQF_TRIGGER_RISING, dcdc->name, 832 dcdc); 833 if (ret != 0) { 834 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 835 irq, ret); 836 goto err_regulator; 837 } 838 839 platform_set_drvdata(pdev, dcdc); 840 841 return 0; 842 843 err_regulator: 844 regulator_unregister(dcdc->regulator); 845 err: 846 return ret; 847 } 848 849 static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 850 { 851 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 852 853 platform_set_drvdata(pdev, NULL); 854 855 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")), 856 dcdc); 857 regulator_unregister(dcdc->regulator); 858 859 return 0; 860 } 861 862 static struct platform_driver wm831x_boostp_driver = { 863 .probe = wm831x_boostp_probe, 864 .remove = __devexit_p(wm831x_boostp_remove), 865 .driver = { 866 .name = "wm831x-boostp", 867 .owner = THIS_MODULE, 868 }, 869 }; 870 871 /* 872 * External Power Enable 873 * 874 * These aren't actually DCDCs but look like them in hardware so share 875 * code. 876 */ 877 878 #define WM831X_EPE_BASE 6 879 880 static struct regulator_ops wm831x_epe_ops = { 881 .is_enabled = regulator_is_enabled_regmap, 882 .enable = regulator_enable_regmap, 883 .disable = regulator_disable_regmap, 884 .get_status = wm831x_dcdc_get_status, 885 }; 886 887 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 888 { 889 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 890 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 891 struct regulator_config config = { }; 892 int id = pdev->id % ARRAY_SIZE(pdata->epe); 893 struct wm831x_dcdc *dcdc; 894 int ret; 895 896 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 897 898 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 899 if (dcdc == NULL) { 900 dev_err(&pdev->dev, "Unable to allocate private data\n"); 901 return -ENOMEM; 902 } 903 904 dcdc->wm831x = wm831x; 905 906 /* For current parts this is correct; probably need to revisit 907 * in future. 908 */ 909 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 910 dcdc->desc.name = dcdc->name; 911 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 912 dcdc->desc.ops = &wm831x_epe_ops; 913 dcdc->desc.type = REGULATOR_VOLTAGE; 914 dcdc->desc.owner = THIS_MODULE; 915 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 916 dcdc->desc.enable_mask = 1 << dcdc->desc.id; 917 918 config.dev = pdev->dev.parent; 919 if (pdata) 920 config.init_data = pdata->epe[id]; 921 config.driver_data = dcdc; 922 config.regmap = wm831x->regmap; 923 924 dcdc->regulator = regulator_register(&dcdc->desc, &config); 925 if (IS_ERR(dcdc->regulator)) { 926 ret = PTR_ERR(dcdc->regulator); 927 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 928 id + 1, ret); 929 goto err; 930 } 931 932 platform_set_drvdata(pdev, dcdc); 933 934 return 0; 935 936 err: 937 return ret; 938 } 939 940 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 941 { 942 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 943 944 platform_set_drvdata(pdev, NULL); 945 regulator_unregister(dcdc->regulator); 946 947 return 0; 948 } 949 950 static struct platform_driver wm831x_epe_driver = { 951 .probe = wm831x_epe_probe, 952 .remove = __devexit_p(wm831x_epe_remove), 953 .driver = { 954 .name = "wm831x-epe", 955 .owner = THIS_MODULE, 956 }, 957 }; 958 959 static int __init wm831x_dcdc_init(void) 960 { 961 int ret; 962 ret = platform_driver_register(&wm831x_buckv_driver); 963 if (ret != 0) 964 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 965 966 ret = platform_driver_register(&wm831x_buckp_driver); 967 if (ret != 0) 968 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 969 970 ret = platform_driver_register(&wm831x_boostp_driver); 971 if (ret != 0) 972 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 973 974 ret = platform_driver_register(&wm831x_epe_driver); 975 if (ret != 0) 976 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 977 978 return 0; 979 } 980 subsys_initcall(wm831x_dcdc_init); 981 982 static void __exit wm831x_dcdc_exit(void) 983 { 984 platform_driver_unregister(&wm831x_epe_driver); 985 platform_driver_unregister(&wm831x_boostp_driver); 986 platform_driver_unregister(&wm831x_buckp_driver); 987 platform_driver_unregister(&wm831x_buckv_driver); 988 } 989 module_exit(wm831x_dcdc_exit); 990 991 /* Module information */ 992 MODULE_AUTHOR("Mark Brown"); 993 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 994 MODULE_LICENSE("GPL"); 995 MODULE_ALIAS("platform:wm831x-buckv"); 996 MODULE_ALIAS("platform:wm831x-buckp"); 997 MODULE_ALIAS("platform:wm831x-epe"); 998