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 25 #include <linux/mfd/wm831x/core.h> 26 #include <linux/mfd/wm831x/regulator.h> 27 #include <linux/mfd/wm831x/pdata.h> 28 29 #define WM831X_BUCKV_MAX_SELECTOR 0x68 30 #define WM831X_BUCKP_MAX_SELECTOR 0x66 31 32 #define WM831X_DCDC_MODE_FAST 0 33 #define WM831X_DCDC_MODE_NORMAL 1 34 #define WM831X_DCDC_MODE_IDLE 2 35 #define WM831X_DCDC_MODE_STANDBY 3 36 37 #define WM831X_DCDC_MAX_NAME 6 38 39 /* Register offsets in control block */ 40 #define WM831X_DCDC_CONTROL_1 0 41 #define WM831X_DCDC_CONTROL_2 1 42 #define WM831X_DCDC_ON_CONFIG 2 43 #define WM831X_DCDC_SLEEP_CONTROL 3 44 #define WM831X_DCDC_DVS_CONTROL 4 45 46 /* 47 * Shared 48 */ 49 50 struct wm831x_dcdc { 51 char name[WM831X_DCDC_MAX_NAME]; 52 struct regulator_desc desc; 53 int base; 54 struct wm831x *wm831x; 55 struct regulator_dev *regulator; 56 int dvs_gpio; 57 int dvs_gpio_state; 58 int on_vsel; 59 int dvs_vsel; 60 }; 61 62 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev) 63 { 64 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 65 struct wm831x *wm831x = dcdc->wm831x; 66 int mask = 1 << rdev_get_id(rdev); 67 int reg; 68 69 reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE); 70 if (reg < 0) 71 return reg; 72 73 if (reg & mask) 74 return 1; 75 else 76 return 0; 77 } 78 79 static int wm831x_dcdc_enable(struct regulator_dev *rdev) 80 { 81 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 82 struct wm831x *wm831x = dcdc->wm831x; 83 int mask = 1 << rdev_get_id(rdev); 84 85 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask); 86 } 87 88 static int wm831x_dcdc_disable(struct regulator_dev *rdev) 89 { 90 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 91 struct wm831x *wm831x = dcdc->wm831x; 92 int mask = 1 << rdev_get_id(rdev); 93 94 return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0); 95 } 96 97 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) 98 99 { 100 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 101 struct wm831x *wm831x = dcdc->wm831x; 102 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 103 int val; 104 105 val = wm831x_reg_read(wm831x, reg); 106 if (val < 0) 107 return val; 108 109 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; 110 111 switch (val) { 112 case WM831X_DCDC_MODE_FAST: 113 return REGULATOR_MODE_FAST; 114 case WM831X_DCDC_MODE_NORMAL: 115 return REGULATOR_MODE_NORMAL; 116 case WM831X_DCDC_MODE_STANDBY: 117 return REGULATOR_MODE_STANDBY; 118 case WM831X_DCDC_MODE_IDLE: 119 return REGULATOR_MODE_IDLE; 120 default: 121 BUG(); 122 } 123 } 124 125 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 126 unsigned int mode) 127 { 128 int val; 129 130 switch (mode) { 131 case REGULATOR_MODE_FAST: 132 val = WM831X_DCDC_MODE_FAST; 133 break; 134 case REGULATOR_MODE_NORMAL: 135 val = WM831X_DCDC_MODE_NORMAL; 136 break; 137 case REGULATOR_MODE_STANDBY: 138 val = WM831X_DCDC_MODE_STANDBY; 139 break; 140 case REGULATOR_MODE_IDLE: 141 val = WM831X_DCDC_MODE_IDLE; 142 break; 143 default: 144 return -EINVAL; 145 } 146 147 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 148 val << WM831X_DC1_ON_MODE_SHIFT); 149 } 150 151 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 152 { 153 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 154 struct wm831x *wm831x = dcdc->wm831x; 155 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 156 157 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 158 } 159 160 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 161 unsigned int mode) 162 { 163 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 164 struct wm831x *wm831x = dcdc->wm831x; 165 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 166 167 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 168 } 169 170 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 171 { 172 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 173 struct wm831x *wm831x = dcdc->wm831x; 174 int ret; 175 176 /* First, check for errors */ 177 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 178 if (ret < 0) 179 return ret; 180 181 if (ret & (1 << rdev_get_id(rdev))) { 182 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 183 rdev_get_id(rdev) + 1); 184 return REGULATOR_STATUS_ERROR; 185 } 186 187 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 188 if (rdev_get_id(rdev) < 2) { 189 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 190 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 191 rdev_get_id(rdev) + 1); 192 return REGULATOR_STATUS_ERROR; 193 } 194 195 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 196 dev_dbg(wm831x->dev, "DCDC%d over current\n", 197 rdev_get_id(rdev) + 1); 198 return REGULATOR_STATUS_ERROR; 199 } 200 } 201 202 /* Is the regulator on? */ 203 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 204 if (ret < 0) 205 return ret; 206 if (!(ret & (1 << rdev_get_id(rdev)))) 207 return REGULATOR_STATUS_OFF; 208 209 /* TODO: When we handle hardware control modes so we can report the 210 * current mode. */ 211 return REGULATOR_STATUS_ON; 212 } 213 214 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 215 { 216 struct wm831x_dcdc *dcdc = data; 217 218 regulator_notifier_call_chain(dcdc->regulator, 219 REGULATOR_EVENT_UNDER_VOLTAGE, 220 NULL); 221 222 return IRQ_HANDLED; 223 } 224 225 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 226 { 227 struct wm831x_dcdc *dcdc = data; 228 229 regulator_notifier_call_chain(dcdc->regulator, 230 REGULATOR_EVENT_OVER_CURRENT, 231 NULL); 232 233 return IRQ_HANDLED; 234 } 235 236 /* 237 * BUCKV specifics 238 */ 239 240 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 241 unsigned selector) 242 { 243 if (selector <= 0x8) 244 return 600000; 245 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 246 return 600000 + ((selector - 0x8) * 12500); 247 return -EINVAL; 248 } 249 250 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev, 251 int min_uV, int max_uV) 252 { 253 u16 vsel; 254 255 if (min_uV < 600000) 256 vsel = 0; 257 else if (min_uV <= 1800000) 258 vsel = ((min_uV - 600000) / 12500) + 8; 259 else 260 return -EINVAL; 261 262 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 263 return -EINVAL; 264 265 return vsel; 266 } 267 268 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev, 269 int min_uV, int max_uV) 270 { 271 u16 vsel; 272 273 if (max_uV < 600000 || max_uV > 1800000) 274 return -EINVAL; 275 276 vsel = ((max_uV - 600000) / 12500) + 8; 277 278 if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV || 279 wm831x_buckv_list_voltage(rdev, vsel) < max_uV) 280 return -EINVAL; 281 282 return vsel; 283 } 284 285 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 286 { 287 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 288 289 if (state == dcdc->dvs_gpio_state) 290 return 0; 291 292 dcdc->dvs_gpio_state = state; 293 gpio_set_value(dcdc->dvs_gpio, state); 294 295 /* Should wait for DVS state change to be asserted if we have 296 * a GPIO for it, for now assume the device is configured 297 * for the fastest possible transition. 298 */ 299 300 return 0; 301 } 302 303 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev, 304 int min_uV, int max_uV) 305 { 306 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 307 struct wm831x *wm831x = dcdc->wm831x; 308 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 309 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 310 int vsel, ret; 311 312 vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV); 313 if (vsel < 0) 314 return vsel; 315 316 /* If this value is already set then do a GPIO update if we can */ 317 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 318 return wm831x_buckv_set_dvs(rdev, 0); 319 320 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 321 return wm831x_buckv_set_dvs(rdev, 1); 322 323 /* Always set the ON status to the minimum voltage */ 324 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 325 if (ret < 0) 326 return ret; 327 dcdc->on_vsel = vsel; 328 329 if (!dcdc->dvs_gpio) 330 return ret; 331 332 /* Kick the voltage transition now */ 333 ret = wm831x_buckv_set_dvs(rdev, 0); 334 if (ret < 0) 335 return ret; 336 337 /* Set the high voltage as the DVS voltage. This is optimised 338 * for CPUfreq usage, most processors will keep the maximum 339 * voltage constant and lower the minimum with the frequency. */ 340 vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV); 341 if (vsel < 0) { 342 /* This should never happen - at worst the same vsel 343 * should be chosen */ 344 WARN_ON(vsel < 0); 345 return 0; 346 } 347 348 /* Don't bother if it's the same VSEL we're already using */ 349 if (vsel == dcdc->on_vsel) 350 return 0; 351 352 ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel); 353 if (ret == 0) 354 dcdc->dvs_vsel = vsel; 355 else 356 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n", 357 ret); 358 359 return 0; 360 } 361 362 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 363 int uV) 364 { 365 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 366 struct wm831x *wm831x = dcdc->wm831x; 367 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 368 int vsel; 369 370 vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV); 371 if (vsel < 0) 372 return vsel; 373 374 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 375 } 376 377 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev) 378 { 379 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 380 381 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 382 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel); 383 else 384 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel); 385 } 386 387 /* Current limit options */ 388 static u16 wm831x_dcdc_ilim[] = { 389 125, 250, 375, 500, 625, 750, 875, 1000 390 }; 391 392 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 393 int min_uA, int max_uA) 394 { 395 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 396 struct wm831x *wm831x = dcdc->wm831x; 397 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 398 int i; 399 400 for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) { 401 if (max_uA <= wm831x_dcdc_ilim[i]) 402 break; 403 } 404 if (i == ARRAY_SIZE(wm831x_dcdc_ilim)) 405 return -EINVAL; 406 407 return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i); 408 } 409 410 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 411 { 412 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 413 struct wm831x *wm831x = dcdc->wm831x; 414 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 415 int val; 416 417 val = wm831x_reg_read(wm831x, reg); 418 if (val < 0) 419 return val; 420 421 return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK]; 422 } 423 424 static struct regulator_ops wm831x_buckv_ops = { 425 .set_voltage = wm831x_buckv_set_voltage, 426 .get_voltage = wm831x_buckv_get_voltage, 427 .list_voltage = wm831x_buckv_list_voltage, 428 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 429 .set_current_limit = wm831x_buckv_set_current_limit, 430 .get_current_limit = wm831x_buckv_get_current_limit, 431 432 .is_enabled = wm831x_dcdc_is_enabled, 433 .enable = wm831x_dcdc_enable, 434 .disable = wm831x_dcdc_disable, 435 .get_status = wm831x_dcdc_get_status, 436 .get_mode = wm831x_dcdc_get_mode, 437 .set_mode = wm831x_dcdc_set_mode, 438 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 439 }; 440 441 /* 442 * Set up DVS control. We just log errors since we can still run 443 * (with reduced performance) if we fail. 444 */ 445 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 446 struct wm831x_buckv_pdata *pdata) 447 { 448 struct wm831x *wm831x = dcdc->wm831x; 449 int ret; 450 u16 ctrl; 451 452 if (!pdata || !pdata->dvs_gpio) 453 return; 454 455 switch (pdata->dvs_control_src) { 456 case 1: 457 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 458 break; 459 case 2: 460 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 461 break; 462 default: 463 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 464 pdata->dvs_control_src, dcdc->name); 465 return; 466 } 467 468 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 469 WM831X_DC1_DVS_SRC_MASK, ctrl); 470 if (ret < 0) { 471 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 472 dcdc->name, ret); 473 return; 474 } 475 476 ret = gpio_request(pdata->dvs_gpio, "DCDC DVS"); 477 if (ret < 0) { 478 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 479 dcdc->name, ret); 480 return; 481 } 482 483 /* gpiolib won't let us read the GPIO status so pick the higher 484 * of the two existing voltages so we take it as platform data. 485 */ 486 dcdc->dvs_gpio_state = pdata->dvs_init_state; 487 488 ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state); 489 if (ret < 0) { 490 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n", 491 dcdc->name, ret); 492 gpio_free(pdata->dvs_gpio); 493 return; 494 } 495 496 dcdc->dvs_gpio = pdata->dvs_gpio; 497 } 498 499 static __devinit int wm831x_buckv_probe(struct platform_device *pdev) 500 { 501 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 502 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 503 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 504 struct wm831x_dcdc *dcdc; 505 struct resource *res; 506 int ret, irq; 507 508 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 509 510 if (pdata == NULL || pdata->dcdc[id] == NULL) 511 return -ENODEV; 512 513 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 514 if (dcdc == NULL) { 515 dev_err(&pdev->dev, "Unable to allocate private data\n"); 516 return -ENOMEM; 517 } 518 519 dcdc->wm831x = wm831x; 520 521 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 522 if (res == NULL) { 523 dev_err(&pdev->dev, "No I/O resource\n"); 524 ret = -EINVAL; 525 goto err; 526 } 527 dcdc->base = res->start; 528 529 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 530 dcdc->desc.name = dcdc->name; 531 dcdc->desc.id = id; 532 dcdc->desc.type = REGULATOR_VOLTAGE; 533 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 534 dcdc->desc.ops = &wm831x_buckv_ops; 535 dcdc->desc.owner = THIS_MODULE; 536 537 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 538 if (ret < 0) { 539 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 540 goto err; 541 } 542 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 543 544 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 545 if (ret < 0) { 546 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 547 goto err; 548 } 549 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 550 551 if (pdata->dcdc[id]) 552 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 553 554 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 555 pdata->dcdc[id], dcdc); 556 if (IS_ERR(dcdc->regulator)) { 557 ret = PTR_ERR(dcdc->regulator); 558 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 559 id + 1, ret); 560 goto err; 561 } 562 563 irq = platform_get_irq_byname(pdev, "UV"); 564 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 565 IRQF_TRIGGER_RISING, dcdc->name, 566 dcdc); 567 if (ret != 0) { 568 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 569 irq, ret); 570 goto err_regulator; 571 } 572 573 irq = platform_get_irq_byname(pdev, "HC"); 574 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq, 575 IRQF_TRIGGER_RISING, dcdc->name, 576 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 wm831x_free_irq(wm831x, 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 kfree(dcdc); 595 return ret; 596 } 597 598 static __devexit int wm831x_buckv_remove(struct platform_device *pdev) 599 { 600 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 601 struct wm831x *wm831x = dcdc->wm831x; 602 603 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc); 604 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 605 regulator_unregister(dcdc->regulator); 606 if (dcdc->dvs_gpio) 607 gpio_free(dcdc->dvs_gpio); 608 kfree(dcdc); 609 610 return 0; 611 } 612 613 static struct platform_driver wm831x_buckv_driver = { 614 .probe = wm831x_buckv_probe, 615 .remove = __devexit_p(wm831x_buckv_remove), 616 .driver = { 617 .name = "wm831x-buckv", 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) 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 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel); 650 } 651 652 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev, 653 int min_uV, int max_uV) 654 { 655 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 656 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 657 658 return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV); 659 } 660 661 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, 662 int uV) 663 { 664 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 665 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 666 667 return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV); 668 } 669 670 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev) 671 { 672 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 673 struct wm831x *wm831x = dcdc->wm831x; 674 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 675 int val; 676 677 val = wm831x_reg_read(wm831x, reg); 678 if (val < 0) 679 return val; 680 681 return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK); 682 } 683 684 static struct regulator_ops wm831x_buckp_ops = { 685 .set_voltage = wm831x_buckp_set_voltage, 686 .get_voltage = wm831x_buckp_get_voltage, 687 .list_voltage = wm831x_buckp_list_voltage, 688 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 689 690 .is_enabled = wm831x_dcdc_is_enabled, 691 .enable = wm831x_dcdc_enable, 692 .disable = wm831x_dcdc_disable, 693 .get_status = wm831x_dcdc_get_status, 694 .get_mode = wm831x_dcdc_get_mode, 695 .set_mode = wm831x_dcdc_set_mode, 696 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 697 }; 698 699 static __devinit int wm831x_buckp_probe(struct platform_device *pdev) 700 { 701 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 702 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 703 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 704 struct wm831x_dcdc *dcdc; 705 struct resource *res; 706 int ret, irq; 707 708 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 709 710 if (pdata == NULL || pdata->dcdc[id] == NULL) 711 return -ENODEV; 712 713 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 714 if (dcdc == NULL) { 715 dev_err(&pdev->dev, "Unable to allocate private data\n"); 716 return -ENOMEM; 717 } 718 719 dcdc->wm831x = wm831x; 720 721 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 722 if (res == NULL) { 723 dev_err(&pdev->dev, "No I/O resource\n"); 724 ret = -EINVAL; 725 goto err; 726 } 727 dcdc->base = res->start; 728 729 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 730 dcdc->desc.name = dcdc->name; 731 dcdc->desc.id = id; 732 dcdc->desc.type = REGULATOR_VOLTAGE; 733 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 734 dcdc->desc.ops = &wm831x_buckp_ops; 735 dcdc->desc.owner = THIS_MODULE; 736 737 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 738 pdata->dcdc[id], dcdc); 739 if (IS_ERR(dcdc->regulator)) { 740 ret = PTR_ERR(dcdc->regulator); 741 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 742 id + 1, ret); 743 goto err; 744 } 745 746 irq = platform_get_irq_byname(pdev, "UV"); 747 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 748 IRQF_TRIGGER_RISING, dcdc->name, 749 dcdc); 750 if (ret != 0) { 751 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 752 irq, ret); 753 goto err_regulator; 754 } 755 756 platform_set_drvdata(pdev, dcdc); 757 758 return 0; 759 760 err_regulator: 761 regulator_unregister(dcdc->regulator); 762 err: 763 kfree(dcdc); 764 return ret; 765 } 766 767 static __devexit int wm831x_buckp_remove(struct platform_device *pdev) 768 { 769 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 770 struct wm831x *wm831x = dcdc->wm831x; 771 772 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 773 regulator_unregister(dcdc->regulator); 774 kfree(dcdc); 775 776 return 0; 777 } 778 779 static struct platform_driver wm831x_buckp_driver = { 780 .probe = wm831x_buckp_probe, 781 .remove = __devexit_p(wm831x_buckp_remove), 782 .driver = { 783 .name = "wm831x-buckp", 784 }, 785 }; 786 787 /* 788 * DCDC boost convertors 789 */ 790 791 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 792 { 793 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 794 struct wm831x *wm831x = dcdc->wm831x; 795 int ret; 796 797 /* First, check for errors */ 798 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 799 if (ret < 0) 800 return ret; 801 802 if (ret & (1 << rdev_get_id(rdev))) { 803 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 804 rdev_get_id(rdev) + 1); 805 return REGULATOR_STATUS_ERROR; 806 } 807 808 /* Is the regulator on? */ 809 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 810 if (ret < 0) 811 return ret; 812 if (ret & (1 << rdev_get_id(rdev))) 813 return REGULATOR_STATUS_ON; 814 else 815 return REGULATOR_STATUS_OFF; 816 } 817 818 static struct regulator_ops wm831x_boostp_ops = { 819 .get_status = wm831x_boostp_get_status, 820 821 .is_enabled = wm831x_dcdc_is_enabled, 822 .enable = wm831x_dcdc_enable, 823 .disable = wm831x_dcdc_disable, 824 }; 825 826 static __devinit int wm831x_boostp_probe(struct platform_device *pdev) 827 { 828 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 829 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 830 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 831 struct wm831x_dcdc *dcdc; 832 struct resource *res; 833 int ret, irq; 834 835 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 836 837 if (pdata == NULL || pdata->dcdc[id] == NULL) 838 return -ENODEV; 839 840 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 841 if (dcdc == NULL) { 842 dev_err(&pdev->dev, "Unable to allocate private data\n"); 843 return -ENOMEM; 844 } 845 846 dcdc->wm831x = wm831x; 847 848 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 849 if (res == NULL) { 850 dev_err(&pdev->dev, "No I/O resource\n"); 851 ret = -EINVAL; 852 goto err; 853 } 854 dcdc->base = res->start; 855 856 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 857 dcdc->desc.name = dcdc->name; 858 dcdc->desc.id = id; 859 dcdc->desc.type = REGULATOR_VOLTAGE; 860 dcdc->desc.ops = &wm831x_boostp_ops; 861 dcdc->desc.owner = THIS_MODULE; 862 863 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 864 pdata->dcdc[id], dcdc); 865 if (IS_ERR(dcdc->regulator)) { 866 ret = PTR_ERR(dcdc->regulator); 867 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 868 id + 1, ret); 869 goto err; 870 } 871 872 irq = platform_get_irq_byname(pdev, "UV"); 873 ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq, 874 IRQF_TRIGGER_RISING, dcdc->name, 875 dcdc); 876 if (ret != 0) { 877 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 878 irq, ret); 879 goto err_regulator; 880 } 881 882 platform_set_drvdata(pdev, dcdc); 883 884 return 0; 885 886 err_regulator: 887 regulator_unregister(dcdc->regulator); 888 err: 889 kfree(dcdc); 890 return ret; 891 } 892 893 static __devexit int wm831x_boostp_remove(struct platform_device *pdev) 894 { 895 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 896 struct wm831x *wm831x = dcdc->wm831x; 897 898 wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc); 899 regulator_unregister(dcdc->regulator); 900 kfree(dcdc); 901 902 return 0; 903 } 904 905 static struct platform_driver wm831x_boostp_driver = { 906 .probe = wm831x_boostp_probe, 907 .remove = __devexit_p(wm831x_boostp_remove), 908 .driver = { 909 .name = "wm831x-boostp", 910 }, 911 }; 912 913 /* 914 * External Power Enable 915 * 916 * These aren't actually DCDCs but look like them in hardware so share 917 * code. 918 */ 919 920 #define WM831X_EPE_BASE 6 921 922 static struct regulator_ops wm831x_epe_ops = { 923 .is_enabled = wm831x_dcdc_is_enabled, 924 .enable = wm831x_dcdc_enable, 925 .disable = wm831x_dcdc_disable, 926 .get_status = wm831x_dcdc_get_status, 927 }; 928 929 static __devinit int wm831x_epe_probe(struct platform_device *pdev) 930 { 931 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 932 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 933 int id = pdev->id % ARRAY_SIZE(pdata->epe); 934 struct wm831x_dcdc *dcdc; 935 int ret; 936 937 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 938 939 if (pdata == NULL || pdata->epe[id] == NULL) 940 return -ENODEV; 941 942 dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL); 943 if (dcdc == NULL) { 944 dev_err(&pdev->dev, "Unable to allocate private data\n"); 945 return -ENOMEM; 946 } 947 948 dcdc->wm831x = wm831x; 949 950 /* For current parts this is correct; probably need to revisit 951 * in future. 952 */ 953 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 954 dcdc->desc.name = dcdc->name; 955 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 956 dcdc->desc.ops = &wm831x_epe_ops; 957 dcdc->desc.type = REGULATOR_VOLTAGE; 958 dcdc->desc.owner = THIS_MODULE; 959 960 dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev, 961 pdata->epe[id], dcdc); 962 if (IS_ERR(dcdc->regulator)) { 963 ret = PTR_ERR(dcdc->regulator); 964 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 965 id + 1, ret); 966 goto err; 967 } 968 969 platform_set_drvdata(pdev, dcdc); 970 971 return 0; 972 973 err: 974 kfree(dcdc); 975 return ret; 976 } 977 978 static __devexit int wm831x_epe_remove(struct platform_device *pdev) 979 { 980 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 981 982 regulator_unregister(dcdc->regulator); 983 kfree(dcdc); 984 985 return 0; 986 } 987 988 static struct platform_driver wm831x_epe_driver = { 989 .probe = wm831x_epe_probe, 990 .remove = __devexit_p(wm831x_epe_remove), 991 .driver = { 992 .name = "wm831x-epe", 993 }, 994 }; 995 996 static int __init wm831x_dcdc_init(void) 997 { 998 int ret; 999 ret = platform_driver_register(&wm831x_buckv_driver); 1000 if (ret != 0) 1001 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 1002 1003 ret = platform_driver_register(&wm831x_buckp_driver); 1004 if (ret != 0) 1005 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 1006 1007 ret = platform_driver_register(&wm831x_boostp_driver); 1008 if (ret != 0) 1009 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 1010 1011 ret = platform_driver_register(&wm831x_epe_driver); 1012 if (ret != 0) 1013 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 1014 1015 return 0; 1016 } 1017 subsys_initcall(wm831x_dcdc_init); 1018 1019 static void __exit wm831x_dcdc_exit(void) 1020 { 1021 platform_driver_unregister(&wm831x_epe_driver); 1022 platform_driver_unregister(&wm831x_boostp_driver); 1023 platform_driver_unregister(&wm831x_buckp_driver); 1024 platform_driver_unregister(&wm831x_buckv_driver); 1025 } 1026 module_exit(wm831x_dcdc_exit); 1027 1028 /* Module information */ 1029 MODULE_AUTHOR("Mark Brown"); 1030 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 1031 MODULE_LICENSE("GPL"); 1032 MODULE_ALIAS("platform:wm831x-buckv"); 1033 MODULE_ALIAS("platform:wm831x-buckp"); 1034