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 } 124 } 125 126 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 127 unsigned int mode) 128 { 129 int val; 130 131 switch (mode) { 132 case REGULATOR_MODE_FAST: 133 val = WM831X_DCDC_MODE_FAST; 134 break; 135 case REGULATOR_MODE_NORMAL: 136 val = WM831X_DCDC_MODE_NORMAL; 137 break; 138 case REGULATOR_MODE_STANDBY: 139 val = WM831X_DCDC_MODE_STANDBY; 140 break; 141 case REGULATOR_MODE_IDLE: 142 val = WM831X_DCDC_MODE_IDLE; 143 break; 144 default: 145 return -EINVAL; 146 } 147 148 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 149 val << WM831X_DC1_ON_MODE_SHIFT); 150 } 151 152 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 153 { 154 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 155 struct wm831x *wm831x = dcdc->wm831x; 156 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 157 158 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 159 } 160 161 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 162 unsigned int mode) 163 { 164 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 165 struct wm831x *wm831x = dcdc->wm831x; 166 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 167 168 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 169 } 170 171 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 172 { 173 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 174 struct wm831x *wm831x = dcdc->wm831x; 175 int ret; 176 177 /* First, check for errors */ 178 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 179 if (ret < 0) 180 return ret; 181 182 if (ret & (1 << rdev_get_id(rdev))) { 183 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 184 rdev_get_id(rdev) + 1); 185 return REGULATOR_STATUS_ERROR; 186 } 187 188 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 189 if (rdev_get_id(rdev) < 2) { 190 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 191 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 192 rdev_get_id(rdev) + 1); 193 return REGULATOR_STATUS_ERROR; 194 } 195 196 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 197 dev_dbg(wm831x->dev, "DCDC%d over current\n", 198 rdev_get_id(rdev) + 1); 199 return REGULATOR_STATUS_ERROR; 200 } 201 } 202 203 /* Is the regulator on? */ 204 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 205 if (ret < 0) 206 return ret; 207 if (!(ret & (1 << rdev_get_id(rdev)))) 208 return REGULATOR_STATUS_OFF; 209 210 /* TODO: When we handle hardware control modes so we can report the 211 * current mode. */ 212 return REGULATOR_STATUS_ON; 213 } 214 215 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 216 { 217 struct wm831x_dcdc *dcdc = data; 218 219 regulator_notifier_call_chain(dcdc->regulator, 220 REGULATOR_EVENT_UNDER_VOLTAGE, 221 NULL); 222 223 return IRQ_HANDLED; 224 } 225 226 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 227 { 228 struct wm831x_dcdc *dcdc = data; 229 230 regulator_notifier_call_chain(dcdc->regulator, 231 REGULATOR_EVENT_OVER_CURRENT, 232 NULL); 233 234 return IRQ_HANDLED; 235 } 236 237 /* 238 * BUCKV specifics 239 */ 240 241 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 242 unsigned selector) 243 { 244 if (selector <= 0x8) 245 return 600000; 246 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 247 return 600000 + ((selector - 0x8) * 12500); 248 return -EINVAL; 249 } 250 251 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev, 252 int min_uV, int max_uV) 253 { 254 u16 vsel; 255 256 if (min_uV < 600000) 257 vsel = 0; 258 else if (min_uV <= 1800000) 259 vsel = ((min_uV - 600000) / 12500) + 8; 260 else 261 return -EINVAL; 262 263 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 264 return -EINVAL; 265 266 return vsel; 267 } 268 269 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev, 270 int min_uV, int max_uV) 271 { 272 u16 vsel; 273 274 if (max_uV < 600000 || max_uV > 1800000) 275 return -EINVAL; 276 277 vsel = ((max_uV - 600000) / 12500) + 8; 278 279 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV || 280 wm831x_buckv_list_voltage(rdev, vsel) < max_uV) 281 return -EINVAL; 282 283 return vsel; 284 } 285 286 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 287 { 288 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 289 290 if (state == dcdc->dvs_gpio_state) 291 return 0; 292 293 dcdc->dvs_gpio_state = state; 294 gpio_set_value(dcdc->dvs_gpio, state); 295 296 /* Should wait for DVS state change to be asserted if we have 297 * a GPIO for it, for now assume the device is configured 298 * for the fastest possible transition. 299 */ 300 301 return 0; 302 } 303 304 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, 305 int min_uV, int max_uV, unsigned *selector) 306 { 307 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 308 struct wm831x *wm831x = dcdc->wm831x; 309 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 310 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 311 int vsel, ret; 312 313 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV); 314 if (vsel < 0) 315 return vsel; 316 317 *selector = vsel; 318 319 /* If this value is already set then do a GPIO update if we can */ 320 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 321 return wm831x_buckv_set_dvs(rdev, 0); 322 323 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 324 return wm831x_buckv_set_dvs(rdev, 1); 325 326 /* Always set the ON status to the minimum voltage */ 327 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 328 if (ret < 0) 329 return ret; 330 dcdc->on_vsel = vsel; 331 332 if (!dcdc->dvs_gpio) 333 return ret; 334 335 /* Kick the voltage transition now */ 336 ret = wm831x_buckv_set_dvs(rdev, 0); 337 if (ret < 0) 338 return ret; 339 340 /* Set the high voltage as the DVS voltage. This is optimised 341 * for CPUfreq usage, most processors will keep the maximum 342 * voltage constant and lower the minimum with the frequency. */ 343 vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV); 344 if (vsel < 0) { 345 /* This should never happen - at worst the same vsel 346 * should be chosen */ 347 WARN_ON(vsel < 0); 348 return 0; 349 } 350 351 /* Don't bother if it's the same VSEL we're already using */ 352 if (vsel == dcdc->on_vsel) 353 return 0; 354 355 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel); 356 if (ret == 0) 357 dcdc->dvs_vsel = vsel; 358 else 359 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n", 360 ret); 361 362 return 0; 363 } 364 365 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 366 int uV) 367 { 368 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 369 struct wm831x *wm831x = dcdc->wm831x; 370 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 371 int vsel; 372 373 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV); 374 if (vsel < 0) 375 return vsel; 376 377 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 378 } 379 380 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev) 381 { 382 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 383 384 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 385 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel); 386 else 387 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel); 388 } 389 390 /* Current limit options */ 391 static u16 wm831x_dcdc_ilim[] = { 392 125, 250, 375, 500, 625, 750, 875, 1000 393 }; 394 395 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 396 int min_uA, int max_uA) 397 { 398 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 399 struct wm831x *wm831x = dcdc->wm831x; 400 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 401 int i; 402 403 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 404 if (max_uA <= wm831x_dcdc_ilim[i]) 405 break; 406 } 407 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 408 return -EINVAL; 409 410 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); 411 } 412 413 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 414 { 415 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 416 struct wm831x *wm831x = dcdc->wm831x; 417 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 418 int val; 419 420 val = wm831x_reg_read(wm831x, reg); 421 if (val < 0) 422 return val; 423 424 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; 425 } 426 427 static struct regulator_ops wm831x_buckv_ops = { 428 .set_voltage = wm831x_buckv_set_voltage, 429 .get_voltage = wm831x_buckv_get_voltage, 430 .list_voltage = wm831x_buckv_list_voltage, 431 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 432 .set_current_limit = wm831x_buckv_set_current_limit, 433 .get_current_limit = wm831x_buckv_get_current_limit, 434 435 .is_enabled = wm831x_dcdc_is_enabled, 436 .enable = wm831x_dcdc_enable, 437 .disable = wm831x_dcdc_disable, 438 .get_status = wm831x_dcdc_get_status, 439 .get_mode = wm831x_dcdc_get_mode, 440 .set_mode = wm831x_dcdc_set_mode, 441 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 442 }; 443 444 /* 445 * Set up DVS control. We just log errors since we can still run 446 * (with reduced performance) if we fail. 447 */ 448 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 449 struct wm831x_buckv_pdata *pdata) 450 { 451 struct wm831x *wm831x = dcdc->wm831x; 452 int ret; 453 u16 ctrl; 454 455 if (!pdata || !pdata->dvs_gpio) 456 return; 457 458 switch (pdata->dvs_control_src) { 459 case 1: 460 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 461 break; 462 case 2: 463 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 464 break; 465 default: 466 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 467 pdata->dvs_control_src, dcdc->name); 468 return; 469 } 470 471 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 472 WM831X_DC1_DVS_SRC_MASK, ctrl); 473 if (ret < 0) { 474 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 475 dcdc->name, ret); 476 return; 477 } 478 479 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); 480 if (ret < 0) { 481 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 482 dcdc->name, ret); 483 return; 484 } 485 486 /* gpiolib won't let us read the GPIO status so pick the higher 487 * of the two existing voltages so we take it as platform data. 488 */ 489 dcdc->dvs_gpio_state = pdata->dvs_init_state; 490 491 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); 492 if (ret < 0) { 493 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", 494 dcdc->name, ret); 495 gpio_free(pdata->dvs_gpio); 496 return; 497 } 498 499 dcdc->dvs_gpio = pdata->dvs_gpio; 500 } 501 502 static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 503 { 504 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 505 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 506 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 507 struct wm831x_dcdc *dcdc; 508 struct resource *res; 509 int ret, irq; 510 511 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 512 513 if (pdata == NULL || pdata->dcdc[id] == NULL) 514 return -ENODEV; 515 516 dcdc = kzalloc(sizeof(struct wm831x_dcdc), 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_ON_CONFIG); 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 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 558 pdata->dcdc[id], dcdc); 559 if (IS_ERR(dcdc->regulator)) { 560 ret = PTR_ERR(dcdc->regulator); 561 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 562 id + 1, ret); 563 goto err; 564 } 565 566 irq = platform_get_irq_byname(pdev, "UV"); 567 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 568 IRQF_TRIGGER_RISING, dcdc->name, 569 dcdc); 570 if (ret != 0) { 571 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 572 irq, ret); 573 goto err_regulator; 574 } 575 576 irq = platform_get_irq_byname(pdev, "HC"); 577 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq, 578 IRQF_TRIGGER_RISING, dcdc->name, 579 dcdc); 580 if (ret != 0) { 581 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 582 irq, ret); 583 goto err_uv; 584 } 585 586 platform_set_drvdata(pdev, dcdc); 587 588 return 0; 589 590 err_uv: 591 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 592 err_regulator: 593 regulator_unregister(dcdc->regulator); 594 err: 595 if (dcdc->dvs_gpio) 596 gpio_free(dcdc->dvs_gpio); 597 kfree(dcdc); 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 struct wm831x *wm831x = dcdc->wm831x; 605 606 platform_set_drvdata(pdev, NULL); 607 608 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc); 609 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 610 regulator_unregister(dcdc->regulator); 611 if (dcdc->dvs_gpio) 612 gpio_free(dcdc->dvs_gpio); 613 kfree(dcdc); 614 615 return 0; 616 } 617 618 static struct platform_driver wm831x_buckv_driver = { 619 .probe = wm831x_buckv_probe, 620 .remove = __devexit_p(wm831x_buckv_remove), 621 .driver = { 622 .name = "wm831x-buckv", 623 .owner = THIS_MODULE, 624 }, 625 }; 626 627 /* 628 * BUCKP specifics 629 */ 630 631 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, 632 unsigned selector) 633 { 634 if (selector <= WM831X_BUCKP_MAX_SELECTOR) 635 return 850000 + (selector * 25000); 636 else 637 return -EINVAL; 638 } 639 640 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, 641 int min_uV, int max_uV, int *selector) 642 { 643 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 644 struct wm831x *wm831x = dcdc->wm831x; 645 u16 vsel; 646 647 if (min_uV <= 34000000) 648 vsel = (min_uV - 850000) / 25000; 649 else 650 return -EINVAL; 651 652 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) 653 return -EINVAL; 654 655 *selector = vsel; 656 657 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 658 } 659 660 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 661 int min_uV, int max_uV, 662 unsigned *selector) 663 { 664 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 665 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 666 667 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV, 668 selector); 669 } 670 671 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 672 int uV) 673 { 674 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 675 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 676 unsigned selector; 677 678 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector); 679 } 680 681 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev) 682 { 683 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 684 struct wm831x *wm831x = dcdc->wm831x; 685 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 686 int val; 687 688 val = wm831x_reg_read(wm831x, reg); 689 if (val < 0) 690 return val; 691 692 return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK); 693 } 694 695 static struct regulator_ops wm831x_buckp_ops = { 696 .set_voltage = wm831x_buckp_set_voltage, 697 .get_voltage = wm831x_buckp_get_voltage, 698 .list_voltage = wm831x_buckp_list_voltage, 699 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 700 701 .is_enabled = wm831x_dcdc_is_enabled, 702 .enable = wm831x_dcdc_enable, 703 .disable = wm831x_dcdc_disable, 704 .get_status = wm831x_dcdc_get_status, 705 .get_mode = wm831x_dcdc_get_mode, 706 .set_mode = wm831x_dcdc_set_mode, 707 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 708 }; 709 710 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 711 { 712 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 713 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 714 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 715 struct wm831x_dcdc *dcdc; 716 struct resource *res; 717 int ret, irq; 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 = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 725 if (dcdc == NULL) { 726 dev_err(&pdev->dev, "Unable to allocate private data\n"); 727 return -ENOMEM; 728 } 729 730 dcdc->wm831x = wm831x; 731 732 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 733 if (res == NULL) { 734 dev_err(&pdev->dev, "No I/O resource\n"); 735 ret = -EINVAL; 736 goto err; 737 } 738 dcdc->base = res->start; 739 740 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 741 dcdc->desc.name = dcdc->name; 742 dcdc->desc.id = id; 743 dcdc->desc.type = REGULATOR_VOLTAGE; 744 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 745 dcdc->desc.ops = &wm831x_buckp_ops; 746 dcdc->desc.owner = THIS_MODULE; 747 748 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 749 pdata->dcdc[id], dcdc); 750 if (IS_ERR(dcdc->regulator)) { 751 ret = PTR_ERR(dcdc->regulator); 752 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 753 id + 1, ret); 754 goto err; 755 } 756 757 irq = platform_get_irq_byname(pdev, "UV"); 758 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 759 IRQF_TRIGGER_RISING, dcdc->name, 760 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 kfree(dcdc); 775 return ret; 776 } 777 778 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 779 { 780 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 781 struct wm831x *wm831x = dcdc->wm831x; 782 783 platform_set_drvdata(pdev, NULL); 784 785 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 786 regulator_unregister(dcdc->regulator); 787 kfree(dcdc); 788 789 return 0; 790 } 791 792 static struct platform_driver wm831x_buckp_driver = { 793 .probe = wm831x_buckp_probe, 794 .remove = __devexit_p(wm831x_buckp_remove), 795 .driver = { 796 .name = "wm831x-buckp", 797 .owner = THIS_MODULE, 798 }, 799 }; 800 801 /* 802 * DCDC boost convertors 803 */ 804 805 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 806 { 807 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 808 struct wm831x *wm831x = dcdc->wm831x; 809 int ret; 810 811 /* First, check for errors */ 812 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 813 if (ret < 0) 814 return ret; 815 816 if (ret & (1 << rdev_get_id(rdev))) { 817 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 818 rdev_get_id(rdev) + 1); 819 return REGULATOR_STATUS_ERROR; 820 } 821 822 /* Is the regulator on? */ 823 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 824 if (ret < 0) 825 return ret; 826 if (ret & (1 << rdev_get_id(rdev))) 827 return REGULATOR_STATUS_ON; 828 else 829 return REGULATOR_STATUS_OFF; 830 } 831 832 static struct regulator_ops wm831x_boostp_ops = { 833 .get_status = wm831x_boostp_get_status, 834 835 .is_enabled = wm831x_dcdc_is_enabled, 836 .enable = wm831x_dcdc_enable, 837 .disable = wm831x_dcdc_disable, 838 }; 839 840 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 841 { 842 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 843 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 844 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 845 struct wm831x_dcdc *dcdc; 846 struct resource *res; 847 int ret, irq; 848 849 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 850 851 if (pdata == NULL || pdata->dcdc[id] == NULL) 852 return -ENODEV; 853 854 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 855 if (dcdc == NULL) { 856 dev_err(&pdev->dev, "Unable to allocate private data\n"); 857 return -ENOMEM; 858 } 859 860 dcdc->wm831x = wm831x; 861 862 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 863 if (res == NULL) { 864 dev_err(&pdev->dev, "No I/O resource\n"); 865 ret = -EINVAL; 866 goto err; 867 } 868 dcdc->base = res->start; 869 870 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 871 dcdc->desc.name = dcdc->name; 872 dcdc->desc.id = id; 873 dcdc->desc.type = REGULATOR_VOLTAGE; 874 dcdc->desc.ops = &wm831x_boostp_ops; 875 dcdc->desc.owner = THIS_MODULE; 876 877 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 878 pdata->dcdc[id], dcdc); 879 if (IS_ERR(dcdc->regulator)) { 880 ret = PTR_ERR(dcdc->regulator); 881 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 882 id + 1, ret); 883 goto err; 884 } 885 886 irq = platform_get_irq_byname(pdev, "UV"); 887 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 888 IRQF_TRIGGER_RISING, dcdc->name, 889 dcdc); 890 if (ret != 0) { 891 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 892 irq, ret); 893 goto err_regulator; 894 } 895 896 platform_set_drvdata(pdev, dcdc); 897 898 return 0; 899 900 err_regulator: 901 regulator_unregister(dcdc->regulator); 902 err: 903 kfree(dcdc); 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 struct wm831x *wm831x = dcdc->wm831x; 911 912 platform_set_drvdata(pdev, NULL); 913 914 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 915 regulator_unregister(dcdc->regulator); 916 kfree(dcdc); 917 918 return 0; 919 } 920 921 static struct platform_driver wm831x_boostp_driver = { 922 .probe = wm831x_boostp_probe, 923 .remove = __devexit_p(wm831x_boostp_remove), 924 .driver = { 925 .name = "wm831x-boostp", 926 .owner = THIS_MODULE, 927 }, 928 }; 929 930 /* 931 * External Power Enable 932 * 933 * These aren't actually DCDCs but look like them in hardware so share 934 * code. 935 */ 936 937 #define WM831X_EPE_BASE 6 938 939 static struct regulator_ops wm831x_epe_ops = { 940 .is_enabled = wm831x_dcdc_is_enabled, 941 .enable = wm831x_dcdc_enable, 942 .disable = wm831x_dcdc_disable, 943 .get_status = wm831x_dcdc_get_status, 944 }; 945 946 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 947 { 948 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 949 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 950 int id = pdev->id % ARRAY_SIZE(pdata->epe); 951 struct wm831x_dcdc *dcdc; 952 int ret; 953 954 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 955 956 if (pdata == NULL || pdata->epe[id] == NULL) 957 return -ENODEV; 958 959 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 960 if (dcdc == NULL) { 961 dev_err(&pdev->dev, "Unable to allocate private data\n"); 962 return -ENOMEM; 963 } 964 965 dcdc->wm831x = wm831x; 966 967 /* For current parts this is correct; probably need to revisit 968 * in future. 969 */ 970 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 971 dcdc->desc.name = dcdc->name; 972 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 973 dcdc->desc.ops = &wm831x_epe_ops; 974 dcdc->desc.type = REGULATOR_VOLTAGE; 975 dcdc->desc.owner = THIS_MODULE; 976 977 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 978 pdata->epe[id], dcdc); 979 if (IS_ERR(dcdc->regulator)) { 980 ret = PTR_ERR(dcdc->regulator); 981 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 982 id + 1, ret); 983 goto err; 984 } 985 986 platform_set_drvdata(pdev, dcdc); 987 988 return 0; 989 990 err: 991 kfree(dcdc); 992 return ret; 993 } 994 995 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 996 { 997 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 998 999 platform_set_drvdata(pdev, NULL); 1000 1001 regulator_unregister(dcdc->regulator); 1002 kfree(dcdc); 1003 1004 return 0; 1005 } 1006 1007 static struct platform_driver wm831x_epe_driver = { 1008 .probe = wm831x_epe_probe, 1009 .remove = __devexit_p(wm831x_epe_remove), 1010 .driver = { 1011 .name = "wm831x-epe", 1012 .owner = THIS_MODULE, 1013 }, 1014 }; 1015 1016 static int __init wm831x_dcdc_init(void) 1017 { 1018 int ret; 1019 ret = platform_driver_register(&wm831x_buckv_driver); 1020 if (ret != 0) 1021 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1022 1023 ret = platform_driver_register(&wm831x_buckp_driver); 1024 if (ret != 0) 1025 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1026 1027 ret = platform_driver_register(&wm831x_boostp_driver); 1028 if (ret != 0) 1029 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1030 1031 ret = platform_driver_register(&wm831x_epe_driver); 1032 if (ret != 0) 1033 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1034 1035 return 0; 1036 } 1037 subsys_initcall(wm831x_dcdc_init); 1038 1039 static void __exit wm831x_dcdc_exit(void) 1040 { 1041 platform_driver_unregister(&wm831x_epe_driver); 1042 platform_driver_unregister(&wm831x_boostp_driver); 1043 platform_driver_unregister(&wm831x_buckp_driver); 1044 platform_driver_unregister(&wm831x_buckv_driver); 1045 } 1046 module_exit(wm831x_dcdc_exit); 1047 1048 /* Module information */ 1049 MODULE_AUTHOR("Mark Brown"); 1050 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1051 MODULE_LICENSE("GPL"); 1052 MODULE_ALIAS("platform:wm831x-buckv"); 1053 MODULE_ALIAS("platform:wm831x-buckp"); 1054