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_select_max_voltage(struct regulator_dev *rdev, 271 int min_uV, int max_uV) 272 { 273 u16 vsel; 274 275 if (max_uV < 600000 || max_uV > 1800000) 276 return -EINVAL; 277 278 vsel = ((max_uV - 600000) / 12500) + 8; 279 280 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV || 281 wm831x_buckv_list_voltage(rdev, vsel) < max_uV) 282 return -EINVAL; 283 284 return vsel; 285 } 286 287 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 288 { 289 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 290 291 if (state == dcdc->dvs_gpio_state) 292 return 0; 293 294 dcdc->dvs_gpio_state = state; 295 gpio_set_value(dcdc->dvs_gpio, state); 296 297 /* Should wait for DVS state change to be asserted if we have 298 * a GPIO for it, for now assume the device is configured 299 * for the fastest possible transition. 300 */ 301 302 return 0; 303 } 304 305 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, 306 int min_uV, int max_uV, unsigned *selector) 307 { 308 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 309 struct wm831x *wm831x = dcdc->wm831x; 310 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 311 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 312 int vsel, ret; 313 314 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV); 315 if (vsel < 0) 316 return vsel; 317 318 *selector = vsel; 319 320 /* If this value is already set then do a GPIO update if we can */ 321 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 322 return wm831x_buckv_set_dvs(rdev, 0); 323 324 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 325 return wm831x_buckv_set_dvs(rdev, 1); 326 327 /* Always set the ON status to the minimum voltage */ 328 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 329 if (ret < 0) 330 return ret; 331 dcdc->on_vsel = vsel; 332 333 if (!dcdc->dvs_gpio) 334 return ret; 335 336 /* Kick the voltage transition now */ 337 ret = wm831x_buckv_set_dvs(rdev, 0); 338 if (ret < 0) 339 return ret; 340 341 /* Set the high voltage as the DVS voltage. This is optimised 342 * for CPUfreq usage, most processors will keep the maximum 343 * voltage constant and lower the minimum with the frequency. */ 344 vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV); 345 if (vsel < 0) { 346 /* This should never happen - at worst the same vsel 347 * should be chosen */ 348 WARN_ON(vsel < 0); 349 return 0; 350 } 351 352 /* Don't bother if it's the same VSEL we're already using */ 353 if (vsel == dcdc->on_vsel) 354 return 0; 355 356 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel); 357 if (ret == 0) 358 dcdc->dvs_vsel = vsel; 359 else 360 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n", 361 ret); 362 363 return 0; 364 } 365 366 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 367 int uV) 368 { 369 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 370 struct wm831x *wm831x = dcdc->wm831x; 371 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 372 int vsel; 373 374 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV); 375 if (vsel < 0) 376 return vsel; 377 378 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 379 } 380 381 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) 382 { 383 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 384 385 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 386 return dcdc->dvs_vsel; 387 else 388 return dcdc->on_vsel; 389 } 390 391 /* Current limit options */ 392 static u16 wm831x_dcdc_ilim[] = { 393 125, 250, 375, 500, 625, 750, 875, 1000 394 }; 395 396 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 397 int min_uA, int max_uA) 398 { 399 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 400 struct wm831x *wm831x = dcdc->wm831x; 401 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 402 int i; 403 404 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 405 if (max_uA <= wm831x_dcdc_ilim[i]) 406 break; 407 } 408 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 409 return -EINVAL; 410 411 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); 412 } 413 414 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 415 { 416 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 417 struct wm831x *wm831x = dcdc->wm831x; 418 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 419 int val; 420 421 val = wm831x_reg_read(wm831x, reg); 422 if (val < 0) 423 return val; 424 425 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; 426 } 427 428 static struct regulator_ops wm831x_buckv_ops = { 429 .set_voltage = wm831x_buckv_set_voltage, 430 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 431 .list_voltage = wm831x_buckv_list_voltage, 432 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 433 .set_current_limit = wm831x_buckv_set_current_limit, 434 .get_current_limit = wm831x_buckv_get_current_limit, 435 436 .is_enabled = wm831x_dcdc_is_enabled, 437 .enable = wm831x_dcdc_enable, 438 .disable = wm831x_dcdc_disable, 439 .get_status = wm831x_dcdc_get_status, 440 .get_mode = wm831x_dcdc_get_mode, 441 .set_mode = wm831x_dcdc_set_mode, 442 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 443 }; 444 445 /* 446 * Set up DVS control. We just log errors since we can still run 447 * (with reduced performance) if we fail. 448 */ 449 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 450 struct wm831x_buckv_pdata *pdata) 451 { 452 struct wm831x *wm831x = dcdc->wm831x; 453 int ret; 454 u16 ctrl; 455 456 if (!pdata || !pdata->dvs_gpio) 457 return; 458 459 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); 460 if (ret < 0) { 461 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 462 dcdc->name, ret); 463 return; 464 } 465 466 /* gpiolib won't let us read the GPIO status so pick the higher 467 * of the two existing voltages so we take it as platform data. 468 */ 469 dcdc->dvs_gpio_state = pdata->dvs_init_state; 470 471 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); 472 if (ret < 0) { 473 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", 474 dcdc->name, ret); 475 gpio_free(pdata->dvs_gpio); 476 return; 477 } 478 479 dcdc->dvs_gpio = pdata->dvs_gpio; 480 481 switch (pdata->dvs_control_src) { 482 case 1: 483 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 484 break; 485 case 2: 486 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 487 break; 488 default: 489 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 490 pdata->dvs_control_src, dcdc->name); 491 return; 492 } 493 494 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 495 WM831X_DC1_DVS_SRC_MASK, ctrl); 496 if (ret < 0) { 497 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 498 dcdc->name, ret); 499 } 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; 507 struct wm831x_dcdc *dcdc; 508 struct resource *res; 509 int ret, irq; 510 511 if (pdata && pdata->wm831x_num) 512 id = (pdata->wm831x_num * 10) + 1; 513 else 514 id = 0; 515 id = pdev->id - id; 516 517 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 518 519 if (pdata == NULL || pdata->dcdc[id] == NULL) 520 return -ENODEV; 521 522 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 523 if (dcdc == NULL) { 524 dev_err(&pdev->dev, "Unable to allocate private data\n"); 525 return -ENOMEM; 526 } 527 528 dcdc->wm831x = wm831x; 529 530 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 531 if (res == NULL) { 532 dev_err(&pdev->dev, "No I/O resource\n"); 533 ret = -EINVAL; 534 goto err; 535 } 536 dcdc->base = res->start; 537 538 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 539 dcdc->desc.name = dcdc->name; 540 dcdc->desc.id = id; 541 dcdc->desc.type = REGULATOR_VOLTAGE; 542 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 543 dcdc->desc.ops = &wm831x_buckv_ops; 544 dcdc->desc.owner = THIS_MODULE; 545 546 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 547 if (ret < 0) { 548 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 549 goto err; 550 } 551 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 552 553 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 554 if (ret < 0) { 555 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 556 goto err; 557 } 558 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 559 560 if (pdata->dcdc[id]) 561 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 562 563 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 564 pdata->dcdc[id], dcdc); 565 if (IS_ERR(dcdc->regulator)) { 566 ret = PTR_ERR(dcdc->regulator); 567 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 568 id + 1, ret); 569 goto err; 570 } 571 572 irq = platform_get_irq_byname(pdev, "UV"); 573 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 574 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 575 if (ret != 0) { 576 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 577 irq, ret); 578 goto err_regulator; 579 } 580 581 irq = platform_get_irq_byname(pdev, "HC"); 582 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 583 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 584 if (ret != 0) { 585 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 586 irq, ret); 587 goto err_uv; 588 } 589 590 platform_set_drvdata(pdev, dcdc); 591 592 return 0; 593 594 err_uv: 595 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 596 err_regulator: 597 regulator_unregister(dcdc->regulator); 598 err: 599 if (dcdc->dvs_gpio) 600 gpio_free(dcdc->dvs_gpio); 601 kfree(dcdc); 602 return ret; 603 } 604 605 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 606 { 607 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 608 609 platform_set_drvdata(pdev, NULL); 610 611 free_irq(platform_get_irq_byname(pdev, "HC"), dcdc); 612 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 613 regulator_unregister(dcdc->regulator); 614 if (dcdc->dvs_gpio) 615 gpio_free(dcdc->dvs_gpio); 616 kfree(dcdc); 617 618 return 0; 619 } 620 621 static struct platform_driver wm831x_buckv_driver = { 622 .probe = wm831x_buckv_probe, 623 .remove = __devexit_p(wm831x_buckv_remove), 624 .driver = { 625 .name = "wm831x-buckv", 626 .owner = THIS_MODULE, 627 }, 628 }; 629 630 /* 631 * BUCKP specifics 632 */ 633 634 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev, 635 unsigned selector) 636 { 637 if (selector <= WM831X_BUCKP_MAX_SELECTOR) 638 return 850000 + (selector * 25000); 639 else 640 return -EINVAL; 641 } 642 643 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg, 644 int min_uV, int max_uV, int *selector) 645 { 646 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 647 struct wm831x *wm831x = dcdc->wm831x; 648 u16 vsel; 649 650 if (min_uV <= 34000000) 651 vsel = (min_uV - 850000) / 25000; 652 else 653 return -EINVAL; 654 655 if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV) 656 return -EINVAL; 657 658 *selector = vsel; 659 660 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 661 } 662 663 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 664 int min_uV, int max_uV, 665 unsigned *selector) 666 { 667 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 668 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 669 670 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV, 671 selector); 672 } 673 674 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 675 int uV) 676 { 677 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 678 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 679 unsigned selector; 680 681 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV, &selector); 682 } 683 684 static int wm831x_buckp_get_voltage_sel(struct regulator_dev *rdev) 685 { 686 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 687 struct wm831x *wm831x = dcdc->wm831x; 688 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 689 int val; 690 691 val = wm831x_reg_read(wm831x, reg); 692 if (val < 0) 693 return val; 694 695 return val & WM831X_DC3_ON_VSEL_MASK; 696 } 697 698 static struct regulator_ops wm831x_buckp_ops = { 699 .set_voltage = wm831x_buckp_set_voltage, 700 .get_voltage_sel = wm831x_buckp_get_voltage_sel, 701 .list_voltage = wm831x_buckp_list_voltage, 702 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 703 704 .is_enabled = wm831x_dcdc_is_enabled, 705 .enable = wm831x_dcdc_enable, 706 .disable = wm831x_dcdc_disable, 707 .get_status = wm831x_dcdc_get_status, 708 .get_mode = wm831x_dcdc_get_mode, 709 .set_mode = wm831x_dcdc_set_mode, 710 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 711 }; 712 713 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 714 { 715 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 716 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 717 int id; 718 struct wm831x_dcdc *dcdc; 719 struct resource *res; 720 int ret, irq; 721 722 if (pdata && pdata->wm831x_num) 723 id = (pdata->wm831x_num * 10) + 1; 724 else 725 id = 0; 726 id = pdev->id - id; 727 728 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 729 730 if (pdata == NULL || pdata->dcdc[id] == NULL) 731 return -ENODEV; 732 733 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 734 if (dcdc == NULL) { 735 dev_err(&pdev->dev, "Unable to allocate private data\n"); 736 return -ENOMEM; 737 } 738 739 dcdc->wm831x = wm831x; 740 741 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 742 if (res == NULL) { 743 dev_err(&pdev->dev, "No I/O resource\n"); 744 ret = -EINVAL; 745 goto err; 746 } 747 dcdc->base = res->start; 748 749 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 750 dcdc->desc.name = dcdc->name; 751 dcdc->desc.id = id; 752 dcdc->desc.type = REGULATOR_VOLTAGE; 753 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 754 dcdc->desc.ops = &wm831x_buckp_ops; 755 dcdc->desc.owner = THIS_MODULE; 756 757 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 758 pdata->dcdc[id], dcdc); 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 kfree(dcdc); 783 return ret; 784 } 785 786 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 787 { 788 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 789 790 platform_set_drvdata(pdev, NULL); 791 792 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 793 regulator_unregister(dcdc->regulator); 794 kfree(dcdc); 795 796 return 0; 797 } 798 799 static struct platform_driver wm831x_buckp_driver = { 800 .probe = wm831x_buckp_probe, 801 .remove = __devexit_p(wm831x_buckp_remove), 802 .driver = { 803 .name = "wm831x-buckp", 804 .owner = THIS_MODULE, 805 }, 806 }; 807 808 /* 809 * DCDC boost convertors 810 */ 811 812 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 813 { 814 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 815 struct wm831x *wm831x = dcdc->wm831x; 816 int ret; 817 818 /* First, check for errors */ 819 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 820 if (ret < 0) 821 return ret; 822 823 if (ret & (1 << rdev_get_id(rdev))) { 824 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 825 rdev_get_id(rdev) + 1); 826 return REGULATOR_STATUS_ERROR; 827 } 828 829 /* Is the regulator on? */ 830 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 831 if (ret < 0) 832 return ret; 833 if (ret & (1 << rdev_get_id(rdev))) 834 return REGULATOR_STATUS_ON; 835 else 836 return REGULATOR_STATUS_OFF; 837 } 838 839 static struct regulator_ops wm831x_boostp_ops = { 840 .get_status = wm831x_boostp_get_status, 841 842 .is_enabled = wm831x_dcdc_is_enabled, 843 .enable = wm831x_dcdc_enable, 844 .disable = wm831x_dcdc_disable, 845 }; 846 847 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 848 { 849 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 850 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 851 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 852 struct wm831x_dcdc *dcdc; 853 struct resource *res; 854 int ret, irq; 855 856 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 857 858 if (pdata == NULL || pdata->dcdc[id] == NULL) 859 return -ENODEV; 860 861 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 862 if (dcdc == NULL) { 863 dev_err(&pdev->dev, "Unable to allocate private data\n"); 864 return -ENOMEM; 865 } 866 867 dcdc->wm831x = wm831x; 868 869 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 870 if (res == NULL) { 871 dev_err(&pdev->dev, "No I/O resource\n"); 872 ret = -EINVAL; 873 goto err; 874 } 875 dcdc->base = res->start; 876 877 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 878 dcdc->desc.name = dcdc->name; 879 dcdc->desc.id = id; 880 dcdc->desc.type = REGULATOR_VOLTAGE; 881 dcdc->desc.ops = &wm831x_boostp_ops; 882 dcdc->desc.owner = THIS_MODULE; 883 884 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 885 pdata->dcdc[id], dcdc); 886 if (IS_ERR(dcdc->regulator)) { 887 ret = PTR_ERR(dcdc->regulator); 888 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 889 id + 1, ret); 890 goto err; 891 } 892 893 irq = platform_get_irq_byname(pdev, "UV"); 894 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 895 IRQF_TRIGGER_RISING, dcdc->name, 896 dcdc); 897 if (ret != 0) { 898 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 899 irq, ret); 900 goto err_regulator; 901 } 902 903 platform_set_drvdata(pdev, dcdc); 904 905 return 0; 906 907 err_regulator: 908 regulator_unregister(dcdc->regulator); 909 err: 910 kfree(dcdc); 911 return ret; 912 } 913 914 static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 915 { 916 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 917 918 platform_set_drvdata(pdev, NULL); 919 920 free_irq(platform_get_irq_byname(pdev, "UV"), dcdc); 921 regulator_unregister(dcdc->regulator); 922 kfree(dcdc); 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 int id = pdev->id % ARRAY_SIZE(pdata->epe); 957 struct wm831x_dcdc *dcdc; 958 int ret; 959 960 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 961 962 if (pdata == NULL || pdata->epe[id] == NULL) 963 return -ENODEV; 964 965 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 966 if (dcdc == NULL) { 967 dev_err(&pdev->dev, "Unable to allocate private data\n"); 968 return -ENOMEM; 969 } 970 971 dcdc->wm831x = wm831x; 972 973 /* For current parts this is correct; probably need to revisit 974 * in future. 975 */ 976 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 977 dcdc->desc.name = dcdc->name; 978 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 979 dcdc->desc.ops = &wm831x_epe_ops; 980 dcdc->desc.type = REGULATOR_VOLTAGE; 981 dcdc->desc.owner = THIS_MODULE; 982 983 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 984 pdata->epe[id], dcdc); 985 if (IS_ERR(dcdc->regulator)) { 986 ret = PTR_ERR(dcdc->regulator); 987 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 988 id + 1, ret); 989 goto err; 990 } 991 992 platform_set_drvdata(pdev, dcdc); 993 994 return 0; 995 996 err: 997 kfree(dcdc); 998 return ret; 999 } 1000 1001 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 1002 { 1003 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 1004 1005 platform_set_drvdata(pdev, NULL); 1006 1007 regulator_unregister(dcdc->regulator); 1008 kfree(dcdc); 1009 1010 return 0; 1011 } 1012 1013 static struct platform_driver wm831x_epe_driver = { 1014 .probe = wm831x_epe_probe, 1015 .remove = __devexit_p(wm831x_epe_remove), 1016 .driver = { 1017 .name = "wm831x-epe", 1018 .owner = THIS_MODULE, 1019 }, 1020 }; 1021 1022 static int __init wm831x_dcdc_init(void) 1023 { 1024 int ret; 1025 ret = platform_driver_register(&wm831x_buckv_driver); 1026 if (ret != 0) 1027 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1028 1029 ret = platform_driver_register(&wm831x_buckp_driver); 1030 if (ret != 0) 1031 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1032 1033 ret = platform_driver_register(&wm831x_boostp_driver); 1034 if (ret != 0) 1035 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1036 1037 ret = platform_driver_register(&wm831x_epe_driver); 1038 if (ret != 0) 1039 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1040 1041 return 0; 1042 } 1043 subsys_initcall(wm831x_dcdc_init); 1044 1045 static void __exit wm831x_dcdc_exit(void) 1046 { 1047 platform_driver_unregister(&wm831x_epe_driver); 1048 platform_driver_unregister(&wm831x_boostp_driver); 1049 platform_driver_unregister(&wm831x_buckp_driver); 1050 platform_driver_unregister(&wm831x_buckv_driver); 1051 } 1052 module_exit(wm831x_dcdc_exit); 1053 1054 /* Module information */ 1055 MODULE_AUTHOR("Mark Brown"); 1056 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1057 MODULE_LICENSE("GPL"); 1058 MODULE_ALIAS("platform:wm831x-buckv"); 1059 MODULE_ALIAS("platform:wm831x-buckp"); 1060 MODULE_ALIAS("platform:wm831x-epe"); 1061