drivers/regulator/wm831x-ldo.c

   1 /*
   2  * wm831x-ldo.c  --  LDO 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/slab.h>
  23
  24 #include <linux/mfd/wm831x/core.h>
  25 #include <linux/mfd/wm831x/regulator.h>
  26 #include <linux/mfd/wm831x/pdata.h>
  27
  28 #define WM831X_LDO_MAX_NAME 9
  29
  30 #define WM831X_LDO_CONTROL       0
  31 #define WM831X_LDO_ON_CONTROL    1
  32 #define WM831X_LDO_SLEEP_CONTROL 2
  33
  34 #define WM831X_ALIVE_LDO_ON_CONTROL    0
  35 #define WM831X_ALIVE_LDO_SLEEP_CONTROL 1
  36
  37 struct wm831x_ldo {
  38         char name[WM831X_LDO_MAX_NAME];
  39         char supply_name[WM831X_LDO_MAX_NAME];
  40         struct regulator_desc desc;
  41         int base;
  42         struct wm831x *wm831x;
  43         struct regulator_dev *regulator;
  44 };
  45
  46 /*
  47  * Shared
  48  */
  49
  50 static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
  51 {
  52         struct wm831x_ldo *ldo = data;
  53
  54         regulator_notifier_call_chain(ldo->regulator,
  55                                       REGULATOR_EVENT_UNDER_VOLTAGE,
  56                                       NULL);
  57
  58         return IRQ_HANDLED;
  59 }
  60
  61 /*
  62  * General purpose LDOs
  63  */
  64
  65 #define WM831X_GP_LDO_SELECTOR_LOW 0xe
  66 #define WM831X_GP_LDO_MAX_SELECTOR 0x1f
  67
  68 static int wm831x_gp_ldo_list_voltage(struct regulator_dev *rdev,
  69                                       unsigned int selector)
  70 {
  71         /* 0.9-1.6V in 50mV steps */
  72         if (selector <= WM831X_GP_LDO_SELECTOR_LOW)
  73                 return 900000 + (selector * 50000);
  74         /* 1.7-3.3V in 100mV steps */
  75         if (selector <= WM831X_GP_LDO_MAX_SELECTOR)
  76                 return 1600000 + ((selector - WM831X_GP_LDO_SELECTOR_LOW)
  77                                   * 100000);
  78         return -EINVAL;
  79 }
  80
  81 static int wm831x_gp_ldo_map_voltage(struct regulator_dev *rdev,
  82                                      int min_uV, int max_uV)
  83 {
  84         int volt, vsel;
  85
  86         if (min_uV < 900000)
  87                 vsel = 0;
  88         else if (min_uV < 1700000)
  89                 vsel = ((min_uV - 900000) / 50000);
  90         else
  91                 vsel = ((min_uV - 1700000) / 100000)
  92                         + WM831X_GP_LDO_SELECTOR_LOW + 1;
  93
  94         volt = wm831x_gp_ldo_list_voltage(rdev, vsel);
  95         if (volt < min_uV || volt > max_uV)
  96                 return -EINVAL;
  97
  98         return vsel;
  99 }
 100
 101 static int wm831x_gp_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 102                                              int uV)
 103 {
 104         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 105         struct wm831x *wm831x = ldo->wm831x;
 106         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 107
 108         sel = wm831x_gp_ldo_map_voltage(rdev, uV, uV);
 109         if (sel < 0)
 110                 return sel;
 111
 112         return wm831x_set_bits(wm831x, reg, WM831X_LDO1_ON_VSEL_MASK, sel);
 113 }
 114
 115 static unsigned int wm831x_gp_ldo_get_mode(struct regulator_dev *rdev)
 116 {
 117         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 118         struct wm831x *wm831x = ldo->wm831x;
 119         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 120         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 121         int ret;
 122
 123         ret = wm831x_reg_read(wm831x, on_reg);
 124         if (ret < 0)
 125                 return ret;
 126
 127         if (!(ret & WM831X_LDO1_ON_MODE))
 128                 return REGULATOR_MODE_NORMAL;
 129
 130         ret = wm831x_reg_read(wm831x, ctrl_reg);
 131         if (ret < 0)
 132                 return ret;
 133
 134         if (ret & WM831X_LDO1_LP_MODE)
 135                 return REGULATOR_MODE_STANDBY;
 136         else
 137                 return REGULATOR_MODE_IDLE;
 138 }
 139
 140 static int wm831x_gp_ldo_set_mode(struct regulator_dev *rdev,
 141                                   unsigned int mode)
 142 {
 143         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 144         struct wm831x *wm831x = ldo->wm831x;
 145         int ctrl_reg = ldo->base + WM831X_LDO_CONTROL;
 146         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 147         int ret;
 148
 149
 150         switch (mode) {
 151         case REGULATOR_MODE_NORMAL:
 152                 ret = wm831x_set_bits(wm831x, on_reg,
 153                                       WM831X_LDO1_ON_MODE, 0);
 154                 if (ret < 0)
 155                         return ret;
 156                 break;
 157
 158         case REGULATOR_MODE_IDLE:
 159                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 160                                       WM831X_LDO1_LP_MODE, 0);
 161                 if (ret < 0)
 162                         return ret;
 163
 164                 ret = wm831x_set_bits(wm831x, on_reg,
 165                                       WM831X_LDO1_ON_MODE,
 166                                       WM831X_LDO1_ON_MODE);
 167                 if (ret < 0)
 168                         return ret;
 169                 break;
 170
 171         case REGULATOR_MODE_STANDBY:
 172                 ret = wm831x_set_bits(wm831x, ctrl_reg,
 173                                       WM831X_LDO1_LP_MODE,
 174                                       WM831X_LDO1_LP_MODE);
 175                 if (ret < 0)
 176                         return ret;
 177
 178                 ret = wm831x_set_bits(wm831x, on_reg,
 179                                       WM831X_LDO1_ON_MODE,
 180                                       WM831X_LDO1_ON_MODE);
 181                 if (ret < 0)
 182                         return ret;
 183                 break;
 184
 185         default:
 186                 return -EINVAL;
 187         }
 188
 189         return 0;
 190 }
 191
 192 static int wm831x_gp_ldo_get_status(struct regulator_dev *rdev)
 193 {
 194         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 195         struct wm831x *wm831x = ldo->wm831x;
 196         int mask = 1 << rdev_get_id(rdev);
 197         int ret;
 198
 199         /* Is the regulator on? */
 200         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 201         if (ret < 0)
 202                 return ret;
 203         if (!(ret & mask))
 204                 return REGULATOR_STATUS_OFF;
 205
 206         /* Is it reporting under voltage? */
 207         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 208         if (ret < 0)
 209                 return ret;
 210         if (ret & mask)
 211                 return REGULATOR_STATUS_ERROR;
 212
 213         ret = wm831x_gp_ldo_get_mode(rdev);
 214         if (ret < 0)
 215                 return ret;
 216         else
 217                 return regulator_mode_to_status(ret);
 218 }
 219
 220 static unsigned int wm831x_gp_ldo_get_optimum_mode(struct regulator_dev *rdev,
 221                                                    int input_uV,
 222                                                    int output_uV, int load_uA)
 223 {
 224         if (load_uA < 20000)
 225                 return REGULATOR_MODE_STANDBY;
 226         if (load_uA < 50000)
 227                 return REGULATOR_MODE_IDLE;
 228         return REGULATOR_MODE_NORMAL;
 229 }
 230
 231
 232 static struct regulator_ops wm831x_gp_ldo_ops = {
 233         .list_voltage = wm831x_gp_ldo_list_voltage,
 234         .map_voltage = wm831x_gp_ldo_map_voltage,
 235         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 236         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 237         .set_suspend_voltage = wm831x_gp_ldo_set_suspend_voltage,
 238         .get_mode = wm831x_gp_ldo_get_mode,
 239         .set_mode = wm831x_gp_ldo_set_mode,
 240         .get_status = wm831x_gp_ldo_get_status,
 241         .get_optimum_mode = wm831x_gp_ldo_get_optimum_mode,
 242         .get_bypass = regulator_get_bypass_regmap,
 243         .set_bypass = regulator_set_bypass_regmap,
 244
 245         .is_enabled = regulator_is_enabled_regmap,
 246         .enable = regulator_enable_regmap,
 247         .disable = regulator_disable_regmap,
 248 };
 249
 250 static int wm831x_gp_ldo_probe(struct platform_device *pdev)
 251 {
 252         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 253         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 254         struct regulator_config config = { };
 255         int id;
 256         struct wm831x_ldo *ldo;
 257         struct resource *res;
 258         int ret, irq;
 259
 260         if (pdata && pdata->wm831x_num)
 261                 id = (pdata->wm831x_num * 10) + 1;
 262         else
 263                 id = 0;
 264         id = pdev->id - id;
 265
 266         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 267
 268         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 269         if (ldo == NULL) {
 270                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 271                 return -ENOMEM;
 272         }
 273
 274         ldo->wm831x = wm831x;
 275
 276         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 277         if (res == NULL) {
 278                 dev_err(&pdev->dev, "No REG resource\n");
 279                 ret = -EINVAL;
 280                 goto err;
 281         }
 282         ldo->base = res->start;
 283
 284         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 285         ldo->desc.name = ldo->name;
 286
 287         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 288                  "LDO%dVDD", id + 1);
 289         ldo->desc.supply_name = ldo->supply_name;
 290
 291         ldo->desc.id = id;
 292         ldo->desc.type = REGULATOR_VOLTAGE;
 293         ldo->desc.n_voltages = WM831X_GP_LDO_MAX_SELECTOR + 1;
 294         ldo->desc.ops = &wm831x_gp_ldo_ops;
 295         ldo->desc.owner = THIS_MODULE;
 296         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 297         ldo->desc.vsel_mask = WM831X_LDO1_ON_VSEL_MASK;
 298         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 299         ldo->desc.enable_mask = 1 << id;
 300         ldo->desc.bypass_reg = ldo->base;
 301         ldo->desc.bypass_mask = WM831X_LDO1_SWI;
 302
 303         config.dev = pdev->dev.parent;
 304         if (pdata)
 305                 config.init_data = pdata->ldo[id];
 306         config.driver_data = ldo;
 307         config.regmap = wm831x->regmap;
 308
 309         ldo->regulator = regulator_register(&ldo->desc, &config);
 310         if (IS_ERR(ldo->regulator)) {
 311                 ret = PTR_ERR(ldo->regulator);
 312                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 313                         id + 1, ret);
 314                 goto err;
 315         }
 316
 317         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 318         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
 319                                    IRQF_TRIGGER_RISING, ldo->name,
 320                                    ldo);
 321         if (ret != 0) {
 322                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 323                         irq, ret);
 324                 goto err_regulator;
 325         }
 326
 327         platform_set_drvdata(pdev, ldo);
 328
 329         return 0;
 330
 331 err_regulator:
 332         regulator_unregister(ldo->regulator);
 333 err:
 334         return ret;
 335 }
 336
 337 static int wm831x_gp_ldo_remove(struct platform_device *pdev)
 338 {
 339         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 340
 341         free_irq(wm831x_irq(ldo->wm831x,
 342                             platform_get_irq_byname(pdev, "UV")), ldo);
 343         regulator_unregister(ldo->regulator);
 344
 345         return 0;
 346 }
 347
 348 static struct platform_driver wm831x_gp_ldo_driver = {
 349         .probe = wm831x_gp_ldo_probe,
 350         .remove = wm831x_gp_ldo_remove,
 351         .driver         = {
 352                 .name   = "wm831x-ldo",
 353                 .owner  = THIS_MODULE,
 354         },
 355 };
 356
 357 /*
 358  * Analogue LDOs
 359  */
 360
 361
 362 #define WM831X_ALDO_SELECTOR_LOW 0xc
 363 #define WM831X_ALDO_MAX_SELECTOR 0x1f
 364
 365 static int wm831x_aldo_list_voltage(struct regulator_dev *rdev,
 366                                       unsigned int selector)
 367 {
 368         /* 1-1.6V in 50mV steps */
 369         if (selector <= WM831X_ALDO_SELECTOR_LOW)
 370                 return 1000000 + (selector * 50000);
 371         /* 1.7-3.5V in 100mV steps */
 372         if (selector <= WM831X_ALDO_MAX_SELECTOR)
 373                 return 1600000 + ((selector - WM831X_ALDO_SELECTOR_LOW)
 374                                   * 100000);
 375         return -EINVAL;
 376 }
 377
 378 static int wm831x_aldo_map_voltage(struct regulator_dev *rdev,
 379                                    int min_uV, int max_uV)
 380 {
 381         int volt, vsel;
 382
 383         if (min_uV < 1000000)
 384                 vsel = 0;
 385         else if (min_uV < 1700000)
 386                 vsel = ((min_uV - 1000000) / 50000);
 387         else
 388                 vsel = ((min_uV - 1700000) / 100000)
 389                         + WM831X_ALDO_SELECTOR_LOW + 1;
 390
 391         volt = wm831x_aldo_list_voltage(rdev, vsel);
 392         if (volt < min_uV || volt > max_uV)
 393                 return -EINVAL;
 394
 395         return vsel;
 396
 397 }
 398
 399 static int wm831x_aldo_set_suspend_voltage(struct regulator_dev *rdev,
 400                                              int uV)
 401 {
 402         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 403         struct wm831x *wm831x = ldo->wm831x;
 404         int sel, reg = ldo->base + WM831X_LDO_SLEEP_CONTROL;
 405
 406         sel = wm831x_aldo_map_voltage(rdev, uV, uV);
 407         if (sel < 0)
 408                 return sel;
 409
 410         return wm831x_set_bits(wm831x, reg, WM831X_LDO7_ON_VSEL_MASK, sel);
 411 }
 412
 413 static unsigned int wm831x_aldo_get_mode(struct regulator_dev *rdev)
 414 {
 415         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 416         struct wm831x *wm831x = ldo->wm831x;
 417         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 418         int ret;
 419
 420         ret = wm831x_reg_read(wm831x, on_reg);
 421         if (ret < 0)
 422                 return 0;
 423
 424         if (ret & WM831X_LDO7_ON_MODE)
 425                 return REGULATOR_MODE_IDLE;
 426         else
 427                 return REGULATOR_MODE_NORMAL;
 428 }
 429
 430 static int wm831x_aldo_set_mode(struct regulator_dev *rdev,
 431                                   unsigned int mode)
 432 {
 433         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 434         struct wm831x *wm831x = ldo->wm831x;
 435         int on_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 436         int ret;
 437
 438
 439         switch (mode) {
 440         case REGULATOR_MODE_NORMAL:
 441                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE, 0);
 442                 if (ret < 0)
 443                         return ret;
 444                 break;
 445
 446         case REGULATOR_MODE_IDLE:
 447                 ret = wm831x_set_bits(wm831x, on_reg, WM831X_LDO7_ON_MODE,
 448                                       WM831X_LDO7_ON_MODE);
 449                 if (ret < 0)
 450                         return ret;
 451                 break;
 452
 453         default:
 454                 return -EINVAL;
 455         }
 456
 457         return 0;
 458 }
 459
 460 static int wm831x_aldo_get_status(struct regulator_dev *rdev)
 461 {
 462         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 463         struct wm831x *wm831x = ldo->wm831x;
 464         int mask = 1 << rdev_get_id(rdev);
 465         int ret;
 466
 467         /* Is the regulator on? */
 468         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 469         if (ret < 0)
 470                 return ret;
 471         if (!(ret & mask))
 472                 return REGULATOR_STATUS_OFF;
 473
 474         /* Is it reporting under voltage? */
 475         ret = wm831x_reg_read(wm831x, WM831X_LDO_UV_STATUS);
 476         if (ret < 0)
 477                 return ret;
 478         if (ret & mask)
 479                 return REGULATOR_STATUS_ERROR;
 480
 481         ret = wm831x_aldo_get_mode(rdev);
 482         if (ret < 0)
 483                 return ret;
 484         else
 485                 return regulator_mode_to_status(ret);
 486 }
 487
 488 static struct regulator_ops wm831x_aldo_ops = {
 489         .list_voltage = wm831x_aldo_list_voltage,
 490         .map_voltage = wm831x_aldo_map_voltage,
 491         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 492         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 493         .set_suspend_voltage = wm831x_aldo_set_suspend_voltage,
 494         .get_mode = wm831x_aldo_get_mode,
 495         .set_mode = wm831x_aldo_set_mode,
 496         .get_status = wm831x_aldo_get_status,
 497         .set_bypass = regulator_set_bypass_regmap,
 498         .get_bypass = regulator_get_bypass_regmap,
 499
 500         .is_enabled = regulator_is_enabled_regmap,
 501         .enable = regulator_enable_regmap,
 502         .disable = regulator_disable_regmap,
 503 };
 504
 505 static int wm831x_aldo_probe(struct platform_device *pdev)
 506 {
 507         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 508         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 509         struct regulator_config config = { };
 510         int id;
 511         struct wm831x_ldo *ldo;
 512         struct resource *res;
 513         int ret, irq;
 514
 515         if (pdata && pdata->wm831x_num)
 516                 id = (pdata->wm831x_num * 10) + 1;
 517         else
 518                 id = 0;
 519         id = pdev->id - id;
 520
 521         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 522
 523         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 524         if (ldo == NULL) {
 525                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 526                 return -ENOMEM;
 527         }
 528
 529         ldo->wm831x = wm831x;
 530
 531         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 532         if (res == NULL) {
 533                 dev_err(&pdev->dev, "No REG resource\n");
 534                 ret = -EINVAL;
 535                 goto err;
 536         }
 537         ldo->base = res->start;
 538
 539         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 540         ldo->desc.name = ldo->name;
 541
 542         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 543                  "LDO%dVDD", id + 1);
 544         ldo->desc.supply_name = ldo->supply_name;
 545
 546         ldo->desc.id = id;
 547         ldo->desc.type = REGULATOR_VOLTAGE;
 548         ldo->desc.n_voltages = WM831X_ALDO_MAX_SELECTOR + 1;
 549         ldo->desc.ops = &wm831x_aldo_ops;
 550         ldo->desc.owner = THIS_MODULE;
 551         ldo->desc.vsel_reg = ldo->base + WM831X_LDO_ON_CONTROL;
 552         ldo->desc.vsel_mask = WM831X_LDO7_ON_VSEL_MASK;
 553         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 554         ldo->desc.enable_mask = 1 << id;
 555         ldo->desc.bypass_reg = ldo->base;
 556         ldo->desc.bypass_mask = WM831X_LDO7_SWI;
 557
 558         config.dev = pdev->dev.parent;
 559         if (pdata)
 560                 config.init_data = pdata->ldo[id];
 561         config.driver_data = ldo;
 562         config.regmap = wm831x->regmap;
 563
 564         ldo->regulator = regulator_register(&ldo->desc, &config);
 565         if (IS_ERR(ldo->regulator)) {
 566                 ret = PTR_ERR(ldo->regulator);
 567                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 568                         id + 1, ret);
 569                 goto err;
 570         }
 571
 572         irq = wm831x_irq(wm831x, platform_get_irq_byname(pdev, "UV"));
 573         ret = request_threaded_irq(irq, NULL, wm831x_ldo_uv_irq,
 574                                    IRQF_TRIGGER_RISING, ldo->name, ldo);
 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         platform_set_drvdata(pdev, ldo);
 582
 583         return 0;
 584
 585 err_regulator:
 586         regulator_unregister(ldo->regulator);
 587 err:
 588         return ret;
 589 }
 590
 591 static int wm831x_aldo_remove(struct platform_device *pdev)
 592 {
 593         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 594
 595         free_irq(wm831x_irq(ldo->wm831x, platform_get_irq_byname(pdev, "UV")),
 596                  ldo);
 597         regulator_unregister(ldo->regulator);
 598
 599         return 0;
 600 }
 601
 602 static struct platform_driver wm831x_aldo_driver = {
 603         .probe = wm831x_aldo_probe,
 604         .remove = wm831x_aldo_remove,
 605         .driver         = {
 606                 .name   = "wm831x-aldo",
 607                 .owner  = THIS_MODULE,
 608         },
 609 };
 610
 611 /*
 612  * Alive LDO
 613  */
 614
 615 #define WM831X_ALIVE_LDO_MAX_SELECTOR 0xf
 616
 617 static int wm831x_alive_ldo_set_suspend_voltage(struct regulator_dev *rdev,
 618                                              int uV)
 619 {
 620         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 621         struct wm831x *wm831x = ldo->wm831x;
 622         int sel, reg = ldo->base + WM831X_ALIVE_LDO_SLEEP_CONTROL;
 623
 624         sel = regulator_map_voltage_linear(rdev, uV, uV);
 625         if (sel < 0)
 626                 return sel;
 627
 628         return wm831x_set_bits(wm831x, reg, WM831X_LDO11_ON_VSEL_MASK, sel);
 629 }
 630
 631 static int wm831x_alive_ldo_get_status(struct regulator_dev *rdev)
 632 {
 633         struct wm831x_ldo *ldo = rdev_get_drvdata(rdev);
 634         struct wm831x *wm831x = ldo->wm831x;
 635         int mask = 1 << rdev_get_id(rdev);
 636         int ret;
 637
 638         /* Is the regulator on? */
 639         ret = wm831x_reg_read(wm831x, WM831X_LDO_STATUS);
 640         if (ret < 0)
 641                 return ret;
 642         if (ret & mask)
 643                 return REGULATOR_STATUS_ON;
 644         else
 645                 return REGULATOR_STATUS_OFF;
 646 }
 647
 648 static struct regulator_ops wm831x_alive_ldo_ops = {
 649         .list_voltage = regulator_list_voltage_linear,
 650         .map_voltage = regulator_map_voltage_linear,
 651         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 652         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 653         .set_suspend_voltage = wm831x_alive_ldo_set_suspend_voltage,
 654         .get_status = wm831x_alive_ldo_get_status,
 655
 656         .is_enabled = regulator_is_enabled_regmap,
 657         .enable = regulator_enable_regmap,
 658         .disable = regulator_disable_regmap,
 659 };
 660
 661 static int wm831x_alive_ldo_probe(struct platform_device *pdev)
 662 {
 663         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 664         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 665         struct regulator_config config = { };
 666         int id;
 667         struct wm831x_ldo *ldo;
 668         struct resource *res;
 669         int ret;
 670
 671         if (pdata && pdata->wm831x_num)
 672                 id = (pdata->wm831x_num * 10) + 1;
 673         else
 674                 id = 0;
 675         id = pdev->id - id;
 676
 677
 678         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
 679
 680         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_ldo), GFP_KERNEL);
 681         if (ldo == NULL) {
 682                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 683                 return -ENOMEM;
 684         }
 685
 686         ldo->wm831x = wm831x;
 687
 688         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 689         if (res == NULL) {
 690                 dev_err(&pdev->dev, "No REG resource\n");
 691                 ret = -EINVAL;
 692                 goto err;
 693         }
 694         ldo->base = res->start;
 695
 696         snprintf(ldo->name, sizeof(ldo->name), "LDO%d", id + 1);
 697         ldo->desc.name = ldo->name;
 698
 699         snprintf(ldo->supply_name, sizeof(ldo->supply_name),
 700                  "LDO%dVDD", id + 1);
 701         ldo->desc.supply_name = ldo->supply_name;
 702
 703         ldo->desc.id = id;
 704         ldo->desc.type = REGULATOR_VOLTAGE;
 705         ldo->desc.n_voltages = WM831X_ALIVE_LDO_MAX_SELECTOR + 1;
 706         ldo->desc.ops = &wm831x_alive_ldo_ops;
 707         ldo->desc.owner = THIS_MODULE;
 708         ldo->desc.vsel_reg = ldo->base + WM831X_ALIVE_LDO_ON_CONTROL;
 709         ldo->desc.vsel_mask = WM831X_LDO11_ON_VSEL_MASK;
 710         ldo->desc.enable_reg = WM831X_LDO_ENABLE;
 711         ldo->desc.enable_mask = 1 << id;
 712         ldo->desc.min_uV = 800000;
 713         ldo->desc.uV_step = 50000;
 714         ldo->desc.enable_time = 1000;
 715
 716         config.dev = pdev->dev.parent;
 717         if (pdata)
 718                 config.init_data = pdata->ldo[id];
 719         config.driver_data = ldo;
 720         config.regmap = wm831x->regmap;
 721
 722         ldo->regulator = regulator_register(&ldo->desc, &config);
 723         if (IS_ERR(ldo->regulator)) {
 724                 ret = PTR_ERR(ldo->regulator);
 725                 dev_err(wm831x->dev, "Failed to register LDO%d: %d\n",
 726                         id + 1, ret);
 727                 goto err;
 728         }
 729
 730         platform_set_drvdata(pdev, ldo);
 731
 732         return 0;
 733
 734 err:
 735         return ret;
 736 }
 737
 738 static int wm831x_alive_ldo_remove(struct platform_device *pdev)
 739 {
 740         struct wm831x_ldo *ldo = platform_get_drvdata(pdev);
 741
 742         regulator_unregister(ldo->regulator);
 743
 744         return 0;
 745 }
 746
 747 static struct platform_driver wm831x_alive_ldo_driver = {
 748         .probe = wm831x_alive_ldo_probe,
 749         .remove = wm831x_alive_ldo_remove,
 750         .driver         = {
 751                 .name   = "wm831x-alive-ldo",
 752                 .owner  = THIS_MODULE,
 753         },
 754 };
 755
 756 static int __init wm831x_ldo_init(void)
 757 {
 758         int ret;
 759
 760         ret = platform_driver_register(&wm831x_gp_ldo_driver);
 761         if (ret != 0)
 762                 pr_err("Failed to register WM831x GP LDO driver: %d\n", ret);
 763
 764         ret = platform_driver_register(&wm831x_aldo_driver);
 765         if (ret != 0)
 766                 pr_err("Failed to register WM831x ALDO driver: %d\n", ret);
 767
 768         ret = platform_driver_register(&wm831x_alive_ldo_driver);
 769         if (ret != 0)
 770                 pr_err("Failed to register WM831x alive LDO driver: %d\n",
 771                        ret);
 772
 773         return 0;
 774 }
 775 subsys_initcall(wm831x_ldo_init);
 776
 777 static void __exit wm831x_ldo_exit(void)
 778 {
 779         platform_driver_unregister(&wm831x_alive_ldo_driver);
 780         platform_driver_unregister(&wm831x_aldo_driver);
 781         platform_driver_unregister(&wm831x_gp_ldo_driver);
 782 }
 783 module_exit(wm831x_ldo_exit);
 784
 785 /* Module information */
 786 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 787 MODULE_DESCRIPTION("WM831x LDO driver");
 788 MODULE_LICENSE("GPL");
 789 MODULE_ALIAS("platform:wm831x-ldo");
 790 MODULE_ALIAS("platform:wm831x-aldo");
 791 MODULE_ALIAS("platform:wm831x-aliveldo");