1 /* 2 * wm831x-dcdc.c -- DC-DC buck convertor driver for the WM831x series 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/moduleparam.h> 16 #include <linux/init.h> 17 #include <linux/bitops.h> 18 #include <linux/err.h> 19 #include <linux/i2c.h> 20 #include <linux/platform_device.h> 21 #include <linux/regulator/driver.h> 22 #include <linux/regulator/machine.h> 23 #include <linux/gpio.h> 24 #include <linux/slab.h> 25 26 #include <linux/mfd/wm831x/core.h> 27 #include <linux/mfd/wm831x/regulator.h> 28 #include <linux/mfd/wm831x/pdata.h> 29 30 #define WM831X_BUCKV_MAX_SELECTOR 0x68 31 #define WM831X_BUCKP_MAX_SELECTOR 0x66 32 33 #define WM831X_DCDC_MODE_FAST 0 34 #define WM831X_DCDC_MODE_NORMAL 1 35 #define WM831X_DCDC_MODE_IDLE 2 36 #define WM831X_DCDC_MODE_STANDBY 3 37 38 #define WM831X_DCDC_MAX_NAME 9 39 40 /* Register offsets in control block */ 41 #define WM831X_DCDC_CONTROL_1 0 42 #define WM831X_DCDC_CONTROL_2 1 43 #define WM831X_DCDC_ON_CONFIG 2 44 #define WM831X_DCDC_SLEEP_CONTROL 3 45 #define WM831X_DCDC_DVS_CONTROL 4 46 47 /* 48 * Shared 49 */ 50 51 struct wm831x_dcdc { 52 char name[WM831X_DCDC_MAX_NAME]; 53 char supply_name[WM831X_DCDC_MAX_NAME]; 54 struct regulator_desc desc; 55 int base; 56 struct wm831x *wm831x; 57 struct regulator_dev *regulator; 58 int dvs_gpio; 59 int dvs_gpio_state; 60 int on_vsel; 61 int dvs_vsel; 62 }; 63 64 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev) 65 66 { 67 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 68 struct wm831x *wm831x = dcdc->wm831x; 69 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 70 int val; 71 72 val = wm831x_reg_read(wm831x, reg); 73 if (val < 0) 74 return val; 75 76 val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT; 77 78 switch (val) { 79 case WM831X_DCDC_MODE_FAST: 80 return REGULATOR_MODE_FAST; 81 case WM831X_DCDC_MODE_NORMAL: 82 return REGULATOR_MODE_NORMAL; 83 case WM831X_DCDC_MODE_STANDBY: 84 return REGULATOR_MODE_STANDBY; 85 case WM831X_DCDC_MODE_IDLE: 86 return REGULATOR_MODE_IDLE; 87 default: 88 BUG(); 89 return -EINVAL; 90 } 91 } 92 93 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg, 94 unsigned int mode) 95 { 96 int val; 97 98 switch (mode) { 99 case REGULATOR_MODE_FAST: 100 val = WM831X_DCDC_MODE_FAST; 101 break; 102 case REGULATOR_MODE_NORMAL: 103 val = WM831X_DCDC_MODE_NORMAL; 104 break; 105 case REGULATOR_MODE_STANDBY: 106 val = WM831X_DCDC_MODE_STANDBY; 107 break; 108 case REGULATOR_MODE_IDLE: 109 val = WM831X_DCDC_MODE_IDLE; 110 break; 111 default: 112 return -EINVAL; 113 } 114 115 return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK, 116 val << WM831X_DC1_ON_MODE_SHIFT); 117 } 118 119 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode) 120 { 121 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 122 struct wm831x *wm831x = dcdc->wm831x; 123 u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 124 125 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 126 } 127 128 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev, 129 unsigned int mode) 130 { 131 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 132 struct wm831x *wm831x = dcdc->wm831x; 133 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 134 135 return wm831x_dcdc_set_mode_int(wm831x, reg, mode); 136 } 137 138 static int wm831x_dcdc_get_status(struct regulator_dev *rdev) 139 { 140 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 141 struct wm831x *wm831x = dcdc->wm831x; 142 int ret; 143 144 /* First, check for errors */ 145 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 146 if (ret < 0) 147 return ret; 148 149 if (ret & (1 << rdev_get_id(rdev))) { 150 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 151 rdev_get_id(rdev) + 1); 152 return REGULATOR_STATUS_ERROR; 153 } 154 155 /* DCDC1 and DCDC2 can additionally detect high voltage/current */ 156 if (rdev_get_id(rdev) < 2) { 157 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) { 158 dev_dbg(wm831x->dev, "DCDC%d over voltage\n", 159 rdev_get_id(rdev) + 1); 160 return REGULATOR_STATUS_ERROR; 161 } 162 163 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) { 164 dev_dbg(wm831x->dev, "DCDC%d over current\n", 165 rdev_get_id(rdev) + 1); 166 return REGULATOR_STATUS_ERROR; 167 } 168 } 169 170 /* Is the regulator on? */ 171 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 172 if (ret < 0) 173 return ret; 174 if (!(ret & (1 << rdev_get_id(rdev)))) 175 return REGULATOR_STATUS_OFF; 176 177 /* TODO: When we handle hardware control modes so we can report the 178 * current mode. */ 179 return REGULATOR_STATUS_ON; 180 } 181 182 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data) 183 { 184 struct wm831x_dcdc *dcdc = data; 185 186 regulator_notifier_call_chain(dcdc->regulator, 187 REGULATOR_EVENT_UNDER_VOLTAGE, 188 NULL); 189 190 return IRQ_HANDLED; 191 } 192 193 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data) 194 { 195 struct wm831x_dcdc *dcdc = data; 196 197 regulator_notifier_call_chain(dcdc->regulator, 198 REGULATOR_EVENT_OVER_CURRENT, 199 NULL); 200 201 return IRQ_HANDLED; 202 } 203 204 /* 205 * BUCKV specifics 206 */ 207 208 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev, 209 unsigned selector) 210 { 211 if (selector <= 0x8) 212 return 600000; 213 if (selector <= WM831X_BUCKV_MAX_SELECTOR) 214 return 600000 + ((selector - 0x8) * 12500); 215 return -EINVAL; 216 } 217 218 static int wm831x_buckv_map_voltage(struct regulator_dev *rdev, 219 int min_uV, int max_uV) 220 { 221 u16 vsel; 222 223 if (min_uV < 600000) 224 vsel = 0; 225 else if (min_uV <= 1800000) 226 vsel = DIV_ROUND_UP(min_uV - 600000, 12500) + 8; 227 else 228 return -EINVAL; 229 230 if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV) 231 return -EINVAL; 232 233 return vsel; 234 } 235 236 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state) 237 { 238 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 239 240 if (state == dcdc->dvs_gpio_state) 241 return 0; 242 243 dcdc->dvs_gpio_state = state; 244 gpio_set_value(dcdc->dvs_gpio, state); 245 246 /* Should wait for DVS state change to be asserted if we have 247 * a GPIO for it, for now assume the device is configured 248 * for the fastest possible transition. 249 */ 250 251 return 0; 252 } 253 254 static int wm831x_buckv_set_voltage_sel(struct regulator_dev *rdev, 255 unsigned vsel) 256 { 257 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 258 struct wm831x *wm831x = dcdc->wm831x; 259 int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 260 int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL; 261 int ret; 262 263 /* If this value is already set then do a GPIO update if we can */ 264 if (dcdc->dvs_gpio && dcdc->on_vsel == vsel) 265 return wm831x_buckv_set_dvs(rdev, 0); 266 267 if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel) 268 return wm831x_buckv_set_dvs(rdev, 1); 269 270 /* Always set the ON status to the minimum voltage */ 271 ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel); 272 if (ret < 0) 273 return ret; 274 dcdc->on_vsel = vsel; 275 276 if (!dcdc->dvs_gpio) 277 return ret; 278 279 /* Kick the voltage transition now */ 280 ret = wm831x_buckv_set_dvs(rdev, 0); 281 if (ret < 0) 282 return ret; 283 284 /* 285 * If this VSEL is higher than the last one we've seen then 286 * remember it as the DVS VSEL. This is optimised for CPUfreq 287 * usage where we want to get to the highest voltage very 288 * quickly. 289 */ 290 if (vsel > dcdc->dvs_vsel) { 291 ret = wm831x_set_bits(wm831x, dvs_reg, 292 WM831X_DC1_DVS_VSEL_MASK, 293 vsel); 294 if (ret == 0) 295 dcdc->dvs_vsel = vsel; 296 else 297 dev_warn(wm831x->dev, 298 "Failed to set DCDC DVS VSEL: %d\n", ret); 299 } 300 301 return 0; 302 } 303 304 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev, 305 int uV) 306 { 307 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 308 struct wm831x *wm831x = dcdc->wm831x; 309 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 310 int vsel; 311 312 vsel = wm831x_buckv_map_voltage(rdev, uV, uV); 313 if (vsel < 0) 314 return vsel; 315 316 return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel); 317 } 318 319 static int wm831x_buckv_get_voltage_sel(struct regulator_dev *rdev) 320 { 321 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 322 323 if (dcdc->dvs_gpio && dcdc->dvs_gpio_state) 324 return dcdc->dvs_vsel; 325 else 326 return dcdc->on_vsel; 327 } 328 329 /* Current limit options */ 330 static u16 wm831x_dcdc_ilim[] = { 331 125, 250, 375, 500, 625, 750, 875, 1000 332 }; 333 334 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev, 335 int min_uA, int max_uA) 336 { 337 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 338 struct wm831x *wm831x = dcdc->wm831x; 339 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 340 int i; 341 342 for (i = ARRAY_SIZE(wm831x_dcdc_ilim) - 1; i >= 0; i--) { 343 if ((min_uA <= wm831x_dcdc_ilim[i]) && 344 (wm831x_dcdc_ilim[i] <= max_uA)) 345 return wm831x_set_bits(wm831x, reg, 346 WM831X_DC1_HC_THR_MASK, 347 i << WM831X_DC1_HC_THR_SHIFT); 348 } 349 350 return -EINVAL; 351 } 352 353 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev) 354 { 355 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 356 struct wm831x *wm831x = dcdc->wm831x; 357 u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2; 358 int val; 359 360 val = wm831x_reg_read(wm831x, reg); 361 if (val < 0) 362 return val; 363 364 val = (val & WM831X_DC1_HC_THR_MASK) >> WM831X_DC1_HC_THR_SHIFT; 365 return wm831x_dcdc_ilim[val]; 366 } 367 368 static struct regulator_ops wm831x_buckv_ops = { 369 .set_voltage_sel = wm831x_buckv_set_voltage_sel, 370 .get_voltage_sel = wm831x_buckv_get_voltage_sel, 371 .list_voltage = wm831x_buckv_list_voltage, 372 .map_voltage = wm831x_buckv_map_voltage, 373 .set_suspend_voltage = wm831x_buckv_set_suspend_voltage, 374 .set_current_limit = wm831x_buckv_set_current_limit, 375 .get_current_limit = wm831x_buckv_get_current_limit, 376 377 .is_enabled = regulator_is_enabled_regmap, 378 .enable = regulator_enable_regmap, 379 .disable = regulator_disable_regmap, 380 .get_status = wm831x_dcdc_get_status, 381 .get_mode = wm831x_dcdc_get_mode, 382 .set_mode = wm831x_dcdc_set_mode, 383 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 384 }; 385 386 /* 387 * Set up DVS control. We just log errors since we can still run 388 * (with reduced performance) if we fail. 389 */ 390 static void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc, 391 struct wm831x_buckv_pdata *pdata) 392 { 393 struct wm831x *wm831x = dcdc->wm831x; 394 int ret; 395 u16 ctrl; 396 397 if (!pdata || !pdata->dvs_gpio) 398 return; 399 400 /* gpiolib won't let us read the GPIO status so pick the higher 401 * of the two existing voltages so we take it as platform data. 402 */ 403 dcdc->dvs_gpio_state = pdata->dvs_init_state; 404 405 ret = gpio_request_one(pdata->dvs_gpio, 406 dcdc->dvs_gpio_state ? GPIOF_INIT_HIGH : 0, 407 "DCDC DVS"); 408 if (ret < 0) { 409 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n", 410 dcdc->name, ret); 411 return; 412 } 413 414 dcdc->dvs_gpio = pdata->dvs_gpio; 415 416 switch (pdata->dvs_control_src) { 417 case 1: 418 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT; 419 break; 420 case 2: 421 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT; 422 break; 423 default: 424 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n", 425 pdata->dvs_control_src, dcdc->name); 426 return; 427 } 428 429 /* If DVS_VSEL is set to the minimum value then raise it to ON_VSEL 430 * to make bootstrapping a bit smoother. 431 */ 432 if (!dcdc->dvs_vsel) { 433 ret = wm831x_set_bits(wm831x, 434 dcdc->base + WM831X_DCDC_DVS_CONTROL, 435 WM831X_DC1_DVS_VSEL_MASK, dcdc->on_vsel); 436 if (ret == 0) 437 dcdc->dvs_vsel = dcdc->on_vsel; 438 else 439 dev_warn(wm831x->dev, "Failed to set DVS_VSEL: %d\n", 440 ret); 441 } 442 443 ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL, 444 WM831X_DC1_DVS_SRC_MASK, ctrl); 445 if (ret < 0) { 446 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n", 447 dcdc->name, ret); 448 } 449 } 450 451 static int wm831x_buckv_probe(struct platform_device *pdev) 452 { 453 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 454 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 455 struct regulator_config config = { }; 456 int id; 457 struct wm831x_dcdc *dcdc; 458 struct resource *res; 459 int ret, irq; 460 461 if (pdata && pdata->wm831x_num) 462 id = (pdata->wm831x_num * 10) + 1; 463 else 464 id = 0; 465 id = pdev->id - id; 466 467 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 468 469 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 470 GFP_KERNEL); 471 if (dcdc == NULL) { 472 dev_err(&pdev->dev, "Unable to allocate private data\n"); 473 return -ENOMEM; 474 } 475 476 dcdc->wm831x = wm831x; 477 478 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 479 if (res == NULL) { 480 dev_err(&pdev->dev, "No REG resource\n"); 481 ret = -EINVAL; 482 goto err; 483 } 484 dcdc->base = res->start; 485 486 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 487 dcdc->desc.name = dcdc->name; 488 489 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 490 "DC%dVDD", id + 1); 491 dcdc->desc.supply_name = dcdc->supply_name; 492 493 dcdc->desc.id = id; 494 dcdc->desc.type = REGULATOR_VOLTAGE; 495 dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1; 496 dcdc->desc.ops = &wm831x_buckv_ops; 497 dcdc->desc.owner = THIS_MODULE; 498 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 499 dcdc->desc.enable_mask = 1 << id; 500 501 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG); 502 if (ret < 0) { 503 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret); 504 goto err; 505 } 506 dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK; 507 508 ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL); 509 if (ret < 0) { 510 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret); 511 goto err; 512 } 513 dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK; 514 515 if (pdata && pdata->dcdc[id]) 516 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data); 517 518 config.dev = pdev->dev.parent; 519 if (pdata) 520 config.init_data = pdata->dcdc[id]; 521 config.driver_data = dcdc; 522 config.regmap = wm831x->regmap; 523 524 dcdc->regulator = regulator_register(&dcdc->desc, &config); 525 if (IS_ERR(dcdc->regulator)) { 526 ret = PTR_ERR(dcdc->regulator); 527 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 528 id + 1, ret); 529 goto err; 530 } 531 532 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 533 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 534 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 535 if (ret != 0) { 536 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 537 irq, ret); 538 goto err_regulator; 539 } 540 541 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")); 542 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_oc_irq, 543 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 544 if (ret != 0) { 545 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n", 546 irq, ret); 547 goto err_uv; 548 } 549 550 platform_set_drvdata(pdev, dcdc); 551 552 return 0; 553 554 err_uv: 555 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")), 556 dcdc); 557 err_regulator: 558 regulator_unregister(dcdc->regulator); 559 err: 560 if (dcdc->dvs_gpio) 561 gpio_free(dcdc->dvs_gpio); 562 return ret; 563 } 564 565 static int wm831x_buckv_remove(struct platform_device *pdev) 566 { 567 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 568 struct wm831x *wm831x = dcdc->wm831x; 569 570 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "HC")), 571 dcdc); 572 free_irq(wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")), 573 dcdc); 574 regulator_unregister(dcdc->regulator); 575 if (dcdc->dvs_gpio) 576 gpio_free(dcdc->dvs_gpio); 577 578 return 0; 579 } 580 581 static struct platform_driver wm831x_buckv_driver = { 582 .probe = wm831x_buckv_probe, 583 .remove = wm831x_buckv_remove, 584 .driver = { 585 .name = "wm831x-buckv", 586 .owner = THIS_MODULE, 587 }, 588 }; 589 590 /* 591 * BUCKP specifics 592 */ 593 594 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev, int uV) 595 { 596 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 597 struct wm831x *wm831x = dcdc->wm831x; 598 u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL; 599 int sel; 600 601 sel = regulator_map_voltage_linear(rdev, uV, uV); 602 if (sel < 0) 603 return sel; 604 605 return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, sel); 606 } 607 608 static struct regulator_ops wm831x_buckp_ops = { 609 .set_voltage_sel = regulator_set_voltage_sel_regmap, 610 .get_voltage_sel = regulator_get_voltage_sel_regmap, 611 .list_voltage = regulator_list_voltage_linear, 612 .map_voltage = regulator_map_voltage_linear, 613 .set_suspend_voltage = wm831x_buckp_set_suspend_voltage, 614 615 .is_enabled = regulator_is_enabled_regmap, 616 .enable = regulator_enable_regmap, 617 .disable = regulator_disable_regmap, 618 .get_status = wm831x_dcdc_get_status, 619 .get_mode = wm831x_dcdc_get_mode, 620 .set_mode = wm831x_dcdc_set_mode, 621 .set_suspend_mode = wm831x_dcdc_set_suspend_mode, 622 }; 623 624 static int wm831x_buckp_probe(struct platform_device *pdev) 625 { 626 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 627 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 628 struct regulator_config config = { }; 629 int id; 630 struct wm831x_dcdc *dcdc; 631 struct resource *res; 632 int ret, irq; 633 634 if (pdata && pdata->wm831x_num) 635 id = (pdata->wm831x_num * 10) + 1; 636 else 637 id = 0; 638 id = pdev->id - id; 639 640 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 641 642 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), 643 GFP_KERNEL); 644 if (dcdc == NULL) { 645 dev_err(&pdev->dev, "Unable to allocate private data\n"); 646 return -ENOMEM; 647 } 648 649 dcdc->wm831x = wm831x; 650 651 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 652 if (res == NULL) { 653 dev_err(&pdev->dev, "No REG resource\n"); 654 ret = -EINVAL; 655 goto err; 656 } 657 dcdc->base = res->start; 658 659 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 660 dcdc->desc.name = dcdc->name; 661 662 snprintf(dcdc->supply_name, sizeof(dcdc->supply_name), 663 "DC%dVDD", id + 1); 664 dcdc->desc.supply_name = dcdc->supply_name; 665 666 dcdc->desc.id = id; 667 dcdc->desc.type = REGULATOR_VOLTAGE; 668 dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1; 669 dcdc->desc.ops = &wm831x_buckp_ops; 670 dcdc->desc.owner = THIS_MODULE; 671 dcdc->desc.vsel_reg = dcdc->base + WM831X_DCDC_ON_CONFIG; 672 dcdc->desc.vsel_mask = WM831X_DC3_ON_VSEL_MASK; 673 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 674 dcdc->desc.enable_mask = 1 << id; 675 dcdc->desc.min_uV = 850000; 676 dcdc->desc.uV_step = 25000; 677 678 config.dev = pdev->dev.parent; 679 if (pdata) 680 config.init_data = pdata->dcdc[id]; 681 config.driver_data = dcdc; 682 config.regmap = wm831x->regmap; 683 684 dcdc->regulator = regulator_register(&dcdc->desc, &config); 685 if (IS_ERR(dcdc->regulator)) { 686 ret = PTR_ERR(dcdc->regulator); 687 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 688 id + 1, ret); 689 goto err; 690 } 691 692 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 693 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 694 IRQF_TRIGGER_RISING, dcdc->name, dcdc); 695 if (ret != 0) { 696 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 697 irq, ret); 698 goto err_regulator; 699 } 700 701 platform_set_drvdata(pdev, dcdc); 702 703 return 0; 704 705 err_regulator: 706 regulator_unregister(dcdc->regulator); 707 err: 708 return ret; 709 } 710 711 static int wm831x_buckp_remove(struct platform_device *pdev) 712 { 713 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 714 715 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")), 716 dcdc); 717 regulator_unregister(dcdc->regulator); 718 719 return 0; 720 } 721 722 static struct platform_driver wm831x_buckp_driver = { 723 .probe = wm831x_buckp_probe, 724 .remove = wm831x_buckp_remove, 725 .driver = { 726 .name = "wm831x-buckp", 727 .owner = THIS_MODULE, 728 }, 729 }; 730 731 /* 732 * DCDC boost convertors 733 */ 734 735 static int wm831x_boostp_get_status(struct regulator_dev *rdev) 736 { 737 struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev); 738 struct wm831x *wm831x = dcdc->wm831x; 739 int ret; 740 741 /* First, check for errors */ 742 ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS); 743 if (ret < 0) 744 return ret; 745 746 if (ret & (1 << rdev_get_id(rdev))) { 747 dev_dbg(wm831x->dev, "DCDC%d under voltage\n", 748 rdev_get_id(rdev) + 1); 749 return REGULATOR_STATUS_ERROR; 750 } 751 752 /* Is the regulator on? */ 753 ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS); 754 if (ret < 0) 755 return ret; 756 if (ret & (1 << rdev_get_id(rdev))) 757 return REGULATOR_STATUS_ON; 758 else 759 return REGULATOR_STATUS_OFF; 760 } 761 762 static struct regulator_ops wm831x_boostp_ops = { 763 .get_status = wm831x_boostp_get_status, 764 765 .is_enabled = regulator_is_enabled_regmap, 766 .enable = regulator_enable_regmap, 767 .disable = regulator_disable_regmap, 768 }; 769 770 static int wm831x_boostp_probe(struct platform_device *pdev) 771 { 772 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 773 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 774 struct regulator_config config = { }; 775 int id = pdev->id % ARRAY_SIZE(pdata->dcdc); 776 struct wm831x_dcdc *dcdc; 777 struct resource *res; 778 int ret, irq; 779 780 dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1); 781 782 if (pdata == NULL || pdata->dcdc[id] == NULL) 783 return -ENODEV; 784 785 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 786 if (dcdc == NULL) { 787 dev_err(&pdev->dev, "Unable to allocate private data\n"); 788 return -ENOMEM; 789 } 790 791 dcdc->wm831x = wm831x; 792 793 res = platform_get_resource(pdev, IORESOURCE_REG, 0); 794 if (res == NULL) { 795 dev_err(&pdev->dev, "No REG resource\n"); 796 ret = -EINVAL; 797 goto err; 798 } 799 dcdc->base = res->start; 800 801 snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1); 802 dcdc->desc.name = dcdc->name; 803 dcdc->desc.id = id; 804 dcdc->desc.type = REGULATOR_VOLTAGE; 805 dcdc->desc.ops = &wm831x_boostp_ops; 806 dcdc->desc.owner = THIS_MODULE; 807 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 808 dcdc->desc.enable_mask = 1 << id; 809 810 config.dev = pdev->dev.parent; 811 if (pdata) 812 config.init_data = pdata->dcdc[id]; 813 config.driver_data = dcdc; 814 config.regmap = wm831x->regmap; 815 816 dcdc->regulator = regulator_register(&dcdc->desc, &config); 817 if (IS_ERR(dcdc->regulator)) { 818 ret = PTR_ERR(dcdc->regulator); 819 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n", 820 id + 1, ret); 821 goto err; 822 } 823 824 irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV")); 825 ret = request_threaded_irq(irq, NULL, wm831x_dcdc_uv_irq, 826 IRQF_TRIGGER_RISING, dcdc->name, 827 dcdc); 828 if (ret != 0) { 829 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n", 830 irq, ret); 831 goto err_regulator; 832 } 833 834 platform_set_drvdata(pdev, dcdc); 835 836 return 0; 837 838 err_regulator: 839 regulator_unregister(dcdc->regulator); 840 err: 841 return ret; 842 } 843 844 static int wm831x_boostp_remove(struct platform_device *pdev) 845 { 846 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 847 848 free_irq(wm831x_irq(dcdc->wm831x, platform_get_irq_byname(pdev, "UV")), 849 dcdc); 850 regulator_unregister(dcdc->regulator); 851 852 return 0; 853 } 854 855 static struct platform_driver wm831x_boostp_driver = { 856 .probe = wm831x_boostp_probe, 857 .remove = wm831x_boostp_remove, 858 .driver = { 859 .name = "wm831x-boostp", 860 .owner = THIS_MODULE, 861 }, 862 }; 863 864 /* 865 * External Power Enable 866 * 867 * These aren't actually DCDCs but look like them in hardware so share 868 * code. 869 */ 870 871 #define WM831X_EPE_BASE 6 872 873 static struct regulator_ops wm831x_epe_ops = { 874 .is_enabled = regulator_is_enabled_regmap, 875 .enable = regulator_enable_regmap, 876 .disable = regulator_disable_regmap, 877 .get_status = wm831x_dcdc_get_status, 878 }; 879 880 static int wm831x_epe_probe(struct platform_device *pdev) 881 { 882 struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent); 883 struct wm831x_pdata *pdata = wm831x->dev->platform_data; 884 struct regulator_config config = { }; 885 int id = pdev->id % ARRAY_SIZE(pdata->epe); 886 struct wm831x_dcdc *dcdc; 887 int ret; 888 889 dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1); 890 891 dcdc = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_dcdc), GFP_KERNEL); 892 if (dcdc == NULL) { 893 dev_err(&pdev->dev, "Unable to allocate private data\n"); 894 return -ENOMEM; 895 } 896 897 dcdc->wm831x = wm831x; 898 899 /* For current parts this is correct; probably need to revisit 900 * in future. 901 */ 902 snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1); 903 dcdc->desc.name = dcdc->name; 904 dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */ 905 dcdc->desc.ops = &wm831x_epe_ops; 906 dcdc->desc.type = REGULATOR_VOLTAGE; 907 dcdc->desc.owner = THIS_MODULE; 908 dcdc->desc.enable_reg = WM831X_DCDC_ENABLE; 909 dcdc->desc.enable_mask = 1 << dcdc->desc.id; 910 911 config.dev = pdev->dev.parent; 912 if (pdata) 913 config.init_data = pdata->epe[id]; 914 config.driver_data = dcdc; 915 config.regmap = wm831x->regmap; 916 917 dcdc->regulator = regulator_register(&dcdc->desc, &config); 918 if (IS_ERR(dcdc->regulator)) { 919 ret = PTR_ERR(dcdc->regulator); 920 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n", 921 id + 1, ret); 922 goto err; 923 } 924 925 platform_set_drvdata(pdev, dcdc); 926 927 return 0; 928 929 err: 930 return ret; 931 } 932 933 static int wm831x_epe_remove(struct platform_device *pdev) 934 { 935 struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev); 936 937 regulator_unregister(dcdc->regulator); 938 939 return 0; 940 } 941 942 static struct platform_driver wm831x_epe_driver = { 943 .probe = wm831x_epe_probe, 944 .remove = wm831x_epe_remove, 945 .driver = { 946 .name = "wm831x-epe", 947 .owner = THIS_MODULE, 948 }, 949 }; 950 951 static int __init wm831x_dcdc_init(void) 952 { 953 int ret; 954 ret = platform_driver_register(&wm831x_buckv_driver); 955 if (ret != 0) 956 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret); 957 958 ret = platform_driver_register(&wm831x_buckp_driver); 959 if (ret != 0) 960 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret); 961 962 ret = platform_driver_register(&wm831x_boostp_driver); 963 if (ret != 0) 964 pr_err("Failed to register WM831x BOOST driver: %d\n", ret); 965 966 ret = platform_driver_register(&wm831x_epe_driver); 967 if (ret != 0) 968 pr_err("Failed to register WM831x EPE driver: %d\n", ret); 969 970 return 0; 971 } 972 subsys_initcall(wm831x_dcdc_init); 973 974 static void __exit wm831x_dcdc_exit(void) 975 { 976 platform_driver_unregister(&wm831x_epe_driver); 977 platform_driver_unregister(&wm831x_boostp_driver); 978 platform_driver_unregister(&wm831x_buckp_driver); 979 platform_driver_unregister(&wm831x_buckv_driver); 980 } 981 module_exit(wm831x_dcdc_exit); 982 983 /* Module information */ 984 MODULE_AUTHOR("Mark Brown"); 985 MODULE_DESCRIPTION("WM831x DC-DC convertor driver"); 986 MODULE_LICENSE("GPL"); 987 MODULE_ALIAS("platform:wm831x-buckv"); 988 MODULE_ALIAS("platform:wm831x-buckp"); 989 MODULE_ALIAS("platform:wm831x-boostp"); 990 MODULE_ALIAS("platform:wm831x-epe"); 991