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 int id; 499 struct wm831x_dcdc *dcdc; 500 struct resource *res; 501 int ret, irq; 502 503 if (pdata && pdata->wm831x_num) 504 id = (pdata->wm831x_num * 10) + 1; 505 else 506 id = 0; 507 id = pdev->id - id; 508 509 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 510 511 if (pdata == NULL || pdata->dcdc[id] == NULL) 512 return -ENODEV; 513 514 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 515 GFP_KERNEL); 516 if (dcdc == NULL) { 517 dev_err(&pdev->dev, "Unable to allocate private data\n"); 518 return -ENOMEM; 519 } 520 521 dcdc->wm831x = wm831x; 522 523 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 524 if (res == NULL) { 525 dev_err(&pdev->dev, "No I/O resource\n"); 526 ret = -EINVAL; 527 goto err; 528 } 529 dcdc->base = res->start; 530 531 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 532 dcdc->desc.name = dcdc->name; 533 dcdc->desc.id = id; 534 dcdc->desc.type = REGULATOR_VOLTAGE; 535 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 536 dcdc->desc.ops = &wm831x_buckv_ops; 537 dcdc->desc.owner = THIS_MODULE; 538 539 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 540 if (ret < 0) { 541 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 542 goto err; 543 } 544 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 545 546 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 547 if (ret < 0) { 548 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 549 goto err; 550 } 551 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 552 553 if (pdata->dcdc[id]) 554 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 555 556 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 557 pdata->dcdc[id], dcdc, NULL); 558 if (IS_ERR(dcdc->regulator)) { 559 ret = PTR_ERR(dcdc->regulator); 560 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 561 id + 1, ret); 562 goto err; 563 } 564 565 irq = platform_get_irq_byname(pdev, "UV"); 566 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 567 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 568 if (ret != 0) { 569 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 570 irq, ret); 571 goto err_regulator; 572 } 573 574 irq = platform_get_irq_byname(pdev, "HC"); 575 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 576 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 577 if (ret != 0) { 578 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 579 irq, ret); 580 goto err_uv; 581 } 582 583 platform_set_drvdata(pdev, dcdc); 584 585 return 0; 586 587 err_uv: 588 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 589 err_regulator: 590 regulator_unregister(dcdc->regulator); 591 err: 592 if (dcdc->dvs_gpio) 593 gpio_free(dcdc->dvs_gpio); 594 return ret; 595 } 596 597 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 598 { 599 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 600 601 platform_set_drvdata(pdev, NULL); 602 603 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc); 604 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 605 regulator_unregister(dcdc->regulator); 606 if (dcdc->dvs_gpio) 607 gpio_free(dcdc->dvs_gpio); 608 609 return 0; 610 } 611 612 static struct platform_driver wm831x_buckv_driver = { 613 .probe = wm831x_buckv_probe, 614 .remove = __devexit_p(wm831x_buckv_remove), 615 .driver = { 616 .name = "wm831x-buckv", 617 .owner = THIS_MODULE, 618 }, 619 }; 620 621 /* 622 * BUCKP specifics 623 */ 624 625 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, 626 unsigned selector) 627 { 628 if (selector <= WM831X_BUCKP_MAX_SELECTOR) 629 return 850000 + (selector * 25000); 630 else 631 return -EINVAL; 632 } 633 634 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, 635 int min_uV, int max_uV, int *selector) 636 { 637 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 638 struct wm831x *wm831x = dcdc->wm831x; 639 u16 vsel; 640 641 if (min_uV <= 34000000) 642 vsel = (min_uV - 850000) / 25000; 643 else 644 return -EINVAL; 645 646 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) 647 return -EINVAL; 648 649 *selector = vsel; 650 651 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 652 } 653 654 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 655 int min_uV, int max_uV, 656 unsigned *selector) 657 { 658 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 659 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 660 661 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV, 662 selector); 663 } 664 665 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 666 int uV) 667 { 668 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 669 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 670 unsigned selector; 671 672 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector); 673 } 674 675 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev) 676 { 677 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 678 struct wm831x *wm831x = dcdc->wm831x; 679 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 680 int val; 681 682 val = wm831x_reg_read(wm831x, reg); 683 if (val < 0) 684 return val; 685 686 return val & WM831X_DC3_ON_VSEL_MASK; 687 } 688 689 static struct regulator_ops wm831x_buckp_ops = { 690 .set_voltage = wm831x_buckp_set_voltage, 691 .get_voltage_sel = wm831x_buckp_get_voltage_sel, 692 .list_voltage = wm831x_buckp_list_voltage, 693 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 694 695 .is_enabled = wm831x_dcdc_is_enabled, 696 .enable = wm831x_dcdc_enable, 697 .disable = wm831x_dcdc_disable, 698 .get_status = wm831x_dcdc_get_status, 699 .get_mode = wm831x_dcdc_get_mode, 700 .set_mode = wm831x_dcdc_set_mode, 701 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 702 }; 703 704 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 705 { 706 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 707 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 708 int id; 709 struct wm831x_dcdc *dcdc; 710 struct resource *res; 711 int ret, irq; 712 713 if (pdata && pdata->wm831x_num) 714 id = (pdata->wm831x_num * 10) + 1; 715 else 716 id = 0; 717 id = pdev->id - id; 718 719 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 720 721 if (pdata == NULL || pdata->dcdc[id] == NULL) 722 return -ENODEV; 723 724 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 725 GFP_KERNEL); 726 if (dcdc == NULL) { 727 dev_err(&pdev->dev, "Unable to allocate private data\n"); 728 return -ENOMEM; 729 } 730 731 dcdc->wm831x = wm831x; 732 733 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 734 if (res == NULL) { 735 dev_err(&pdev->dev, "No I/O resource\n"); 736 ret = -EINVAL; 737 goto err; 738 } 739 dcdc->base = res->start; 740 741 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 742 dcdc->desc.name = dcdc->name; 743 dcdc->desc.id = id; 744 dcdc->desc.type = REGULATOR_VOLTAGE; 745 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 746 dcdc->desc.ops = &wm831x_buckp_ops; 747 dcdc->desc.owner = THIS_MODULE; 748 749 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 750 pdata->dcdc[id], dcdc, NULL); 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 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 842 struct wm831x_dcdc *dcdc; 843 struct resource *res; 844 int ret, irq; 845 846 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 847 848 if (pdata == NULL || pdata->dcdc[id] == NULL) 849 return -ENODEV; 850 851 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 852 if (dcdc == NULL) { 853 dev_err(&pdev->dev, "Unable to allocate private data\n"); 854 return -ENOMEM; 855 } 856 857 dcdc->wm831x = wm831x; 858 859 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 860 if (res == NULL) { 861 dev_err(&pdev->dev, "No I/O resource\n"); 862 ret = -EINVAL; 863 goto err; 864 } 865 dcdc->base = res->start; 866 867 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 868 dcdc->desc.name = dcdc->name; 869 dcdc->desc.id = id; 870 dcdc->desc.type = REGULATOR_VOLTAGE; 871 dcdc->desc.ops = &wm831x_boostp_ops; 872 dcdc->desc.owner = THIS_MODULE; 873 874 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 875 pdata->dcdc[id], dcdc, NULL); 876 if (IS_ERR(dcdc->regulator)) { 877 ret = PTR_ERR(dcdc->regulator); 878 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 879 id + 1, ret); 880 goto err; 881 } 882 883 irq = platform_get_irq_byname(pdev, "UV"); 884 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 885 IRQF_TRIGGER_RISING, dcdc->name, 886 dcdc); 887 if (ret != 0) { 888 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 889 irq, ret); 890 goto err_regulator; 891 } 892 893 platform_set_drvdata(pdev, dcdc); 894 895 return 0; 896 897 err_regulator: 898 regulator_unregister(dcdc->regulator); 899 err: 900 kfree(dcdc); 901 return ret; 902 } 903 904 static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 905 { 906 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 907 908 platform_set_drvdata(pdev, NULL); 909 910 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 911 regulator_unregister(dcdc->regulator); 912 kfree(dcdc); 913 914 return 0; 915 } 916 917 static struct platform_driver wm831x_boostp_driver = { 918 .probe = wm831x_boostp_probe, 919 .remove = __devexit_p(wm831x_boostp_remove), 920 .driver = { 921 .name = "wm831x-boostp", 922 .owner = THIS_MODULE, 923 }, 924 }; 925 926 /* 927 * External Power Enable 928 * 929 * These aren't actually DCDCs but look like them in hardware so share 930 * code. 931 */ 932 933 #define WM831X_EPE_BASE 6 934 935 static struct regulator_ops wm831x_epe_ops = { 936 .is_enabled = wm831x_dcdc_is_enabled, 937 .enable = wm831x_dcdc_enable, 938 .disable = wm831x_dcdc_disable, 939 .get_status = wm831x_dcdc_get_status, 940 }; 941 942 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 943 { 944 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 945 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 946 int id = pdev->id % ARRAY_SIZE(pdata->epe); 947 struct wm831x_dcdc *dcdc; 948 int ret; 949 950 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 951 952 if (pdata == NULL || pdata->epe[id] == NULL) 953 return -ENODEV; 954 955 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 956 if (dcdc == NULL) { 957 dev_err(&pdev->dev, "Unable to allocate private data\n"); 958 return -ENOMEM; 959 } 960 961 dcdc->wm831x = wm831x; 962 963 /* For current parts this is correct; probably need to revisit 964 * in future. 965 */ 966 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 967 dcdc->desc.name = dcdc->name; 968 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 969 dcdc->desc.ops = &wm831x_epe_ops; 970 dcdc->desc.type = REGULATOR_VOLTAGE; 971 dcdc->desc.owner = THIS_MODULE; 972 973 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 974 pdata->epe[id], dcdc, NULL); 975 if (IS_ERR(dcdc->regulator)) { 976 ret = PTR_ERR(dcdc->regulator); 977 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 978 id + 1, ret); 979 goto err; 980 } 981 982 platform_set_drvdata(pdev, dcdc); 983 984 return 0; 985 986 err: 987 kfree(dcdc); 988 return ret; 989 } 990 991 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 992 { 993 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 994 995 platform_set_drvdata(pdev, NULL); 996 997 regulator_unregister(dcdc->regulator); 998 kfree(dcdc); 999 1000 return 0; 1001 } 1002 1003 static struct platform_driver wm831x_epe_driver = { 1004 .probe = wm831x_epe_probe, 1005 .remove = __devexit_p(wm831x_epe_remove), 1006 .driver = { 1007 .name = "wm831x-epe", 1008 .owner = THIS_MODULE, 1009 }, 1010 }; 1011 1012 static int __init wm831x_dcdc_init(void) 1013 { 1014 int ret; 1015 ret = platform_driver_register(&wm831x_buckv_driver); 1016 if (ret != 0) 1017 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1018 1019 ret = platform_driver_register(&wm831x_buckp_driver); 1020 if (ret != 0) 1021 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1022 1023 ret = platform_driver_register(&wm831x_boostp_driver); 1024 if (ret != 0) 1025 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1026 1027 ret = platform_driver_register(&wm831x_epe_driver); 1028 if (ret != 0) 1029 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1030 1031 return 0; 1032 } 1033 subsys_initcall(wm831x_dcdc_init); 1034 1035 static void __exit wm831x_dcdc_exit(void) 1036 { 1037 platform_driver_unregister(&wm831x_epe_driver); 1038 platform_driver_unregister(&wm831x_boostp_driver); 1039 platform_driver_unregister(&wm831x_buckp_driver); 1040 platform_driver_unregister(&wm831x_buckv_driver); 1041 } 1042 module_exit(wm831x_dcdc_exit); 1043 1044 /* Module information */ 1045 MODULE_AUTHOR("Mark Brown"); 1046 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1047 MODULE_LICENSE("GPL"); 1048 MODULE_ALIAS("platform:wm831x-buckv"); 1049 MODULE_ALIAS("platform:wm831x-buckp"); 1050 MODULE_ALIAS("platform:wm831x-epe"); 1051