drivers/regulator/wm831x-dcdc.c

   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 #include <linux/delay.h>
  31 #include <linux/time.h>
  32 #include <linux/timer.h>
  33 #include <linux/string.h>
  34
  35 //#include "../../arch/arm/mach-rk29/include/mach/gpio.h"
  36
  37 //#include <linux/hrtimer.h>
  38
  39
  40
  41
  42 #define WM831X_BUCKV_MAX_SELECTOR 0x68
  43 #define WM831X_BUCKP_MAX_SELECTOR 0x66
  44
  45 #define WM831X_DCDC_MODE_FAST    0
  46 #define WM831X_DCDC_MODE_NORMAL  1
  47 #define WM831X_DCDC_MODE_IDLE    2
  48 #define WM831X_DCDC_MODE_STANDBY 3
  49
  50 //#define WM831X_DCDC_MAX_NAME 6
  51
  52 /* Register offsets in control block */
  53 #define WM831X_DCDC_CONTROL_1     0
  54 #define WM831X_DCDC_CONTROL_2     1
  55 #define WM831X_DCDC_ON_CONFIG     2
  56 #define WM831X_DCDC_SLEEP_CONTROL 3
  57 #define WM831X_DCDC_DVS_CONTROL   4
  58
  59 /*
  60  * Shared
  61  */
  62 #if 0
  63 struct wm831x_dcdc {
  64         char name[WM831X_DCDC_MAX_NAME];
  65         struct regulator_desc desc;
  66         int base;
  67         struct wm831x *wm831x;
  68         struct regulator_dev *regulator;
  69         int dvs_gpio;
  70         int dvs_gpio_state;
  71         int on_vsel;
  72         int dvs_vsel;
  73 };
  74 #endif
  75
  76 static int wm831x_dcdc_is_enabled(struct regulator_dev *rdev)
  77 {
  78         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  79         struct wm831x *wm831x = dcdc->wm831x;
  80         int mask = 1 << rdev_get_id(rdev);
  81         int reg;
  82
  83         reg = wm831x_reg_read(wm831x, WM831X_DCDC_ENABLE);
  84         if (reg < 0)
  85                 return reg;
  86
  87         if (reg & mask)
  88                 return 1;
  89         else
  90                 return 0;
  91 }
  92
  93 static int wm831x_dcdc_enable(struct regulator_dev *rdev)
  94 {
  95         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
  96         struct wm831x *wm831x = dcdc->wm831x;
  97         int mask = 1 << rdev_get_id(rdev);
  98
  99         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, mask);
 100 }
 101
 102 static int wm831x_dcdc_disable(struct regulator_dev *rdev)
 103 {
 104         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 105         struct wm831x *wm831x = dcdc->wm831x;
 106         int mask = 1 << rdev_get_id(rdev);
 107
 108         return wm831x_set_bits(wm831x, WM831X_DCDC_ENABLE, mask, 0);
 109 }
 110
 111 static unsigned int wm831x_dcdc_get_mode(struct regulator_dev *rdev)
 112
 113 {
 114         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 115         struct wm831x *wm831x = dcdc->wm831x;
 116         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 117         int val;
 118
 119         val = wm831x_reg_read(wm831x, reg);
 120         if (val < 0)
 121                 return val;
 122
 123         val = (val & WM831X_DC1_ON_MODE_MASK) >> WM831X_DC1_ON_MODE_SHIFT;
 124
 125         switch (val) {
 126         case WM831X_DCDC_MODE_FAST:
 127                 return REGULATOR_MODE_FAST;
 128         case WM831X_DCDC_MODE_NORMAL:
 129                 return REGULATOR_MODE_NORMAL;
 130         case WM831X_DCDC_MODE_STANDBY:
 131                 return REGULATOR_MODE_STANDBY;
 132         case WM831X_DCDC_MODE_IDLE:
 133                 return REGULATOR_MODE_IDLE;
 134         default:
 135                 BUG();
 136         }
 137 }
 138
 139 static int wm831x_dcdc_set_mode_int(struct wm831x *wm831x, int reg,
 140                                     unsigned int mode)
 141 {
 142         int val;
 143
 144         switch (mode) {
 145         case REGULATOR_MODE_FAST:
 146                 val = WM831X_DCDC_MODE_FAST;
 147                 break;
 148         case REGULATOR_MODE_NORMAL:
 149                 val = WM831X_DCDC_MODE_NORMAL;
 150                 break;
 151         case REGULATOR_MODE_STANDBY:
 152                 val = WM831X_DCDC_MODE_STANDBY;
 153                 break;
 154         case REGULATOR_MODE_IDLE:
 155                 val = WM831X_DCDC_MODE_IDLE;
 156                 break;
 157         default:
 158                 return -EINVAL;
 159         }
 160
 161         return wm831x_set_bits(wm831x, reg, WM831X_DC1_ON_MODE_MASK,
 162                                val << WM831X_DC1_ON_MODE_SHIFT);
 163 }
 164
 165 static int wm831x_dcdc_set_mode(struct regulator_dev *rdev, unsigned int mode)
 166 {
 167         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 168         struct wm831x *wm831x = dcdc->wm831x;
 169         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 170
 171         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 172 }
 173
 174 static int wm831x_dcdc_set_suspend_mode(struct regulator_dev *rdev,
 175                                         unsigned int mode)
 176 {
 177         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 178         struct wm831x *wm831x = dcdc->wm831x;
 179         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 180
 181         return wm831x_dcdc_set_mode_int(wm831x, reg, mode);
 182 }
 183
 184 static int wm831x_dcdc_get_status(struct regulator_dev *rdev)
 185 {
 186         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 187         struct wm831x *wm831x = dcdc->wm831x;
 188         int ret;
 189
 190         /* First, check for errors */
 191         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 192         if (ret < 0)
 193                 return ret;
 194
 195         if (ret & (1 << rdev_get_id(rdev))) {
 196                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 197                         rdev_get_id(rdev) + 1);
 198                 return REGULATOR_STATUS_ERROR;
 199         }
 200
 201         /* DCDC1 and DCDC2 can additionally detect high voltage/current */
 202         if (rdev_get_id(rdev) < 2) {
 203                 if (ret & (WM831X_DC1_OV_STS << rdev_get_id(rdev))) {
 204                         dev_dbg(wm831x->dev, "DCDC%d over voltage\n",
 205                                 rdev_get_id(rdev) + 1);
 206                         return REGULATOR_STATUS_ERROR;
 207                 }
 208
 209                 if (ret & (WM831X_DC1_HC_STS << rdev_get_id(rdev))) {
 210                         dev_dbg(wm831x->dev, "DCDC%d over current\n",
 211                                 rdev_get_id(rdev) + 1);
 212                         return REGULATOR_STATUS_ERROR;
 213                 }
 214         }
 215
 216         /* Is the regulator on? */
 217         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 218         if (ret < 0)
 219                 return ret;
 220         if (!(ret & (1 << rdev_get_id(rdev))))
 221                 return REGULATOR_STATUS_OFF;
 222
 223         /* TODO: When we handle hardware control modes so we can report the
 224          * current mode. */
 225         return REGULATOR_STATUS_ON;
 226 }
 227
 228 static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 229 {
 230         struct wm831x_dcdc *dcdc = data;
 231
 232         regulator_notifier_call_chain(dcdc->regulator,
 233                                       REGULATOR_EVENT_UNDER_VOLTAGE,
 234                                       NULL);
 235
 236         return IRQ_HANDLED;
 237 }
 238
 239 static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 240 {
 241         struct wm831x_dcdc *dcdc = data;
 242
 243         regulator_notifier_call_chain(dcdc->regulator,
 244                                       REGULATOR_EVENT_OVER_CURRENT,
 245                                       NULL);
 246
 247         return IRQ_HANDLED;
 248 }
 249
 250 /*
 251  * BUCKV specifics
 252  */
 253
 254 static int wm831x_buckv_list_voltage(struct regulator_dev *rdev,
 255                                       unsigned selector)
 256 {
 257         if (selector <= 0x8)
 258                 return 600000;
 259         if (selector <= WM831X_BUCKV_MAX_SELECTOR)
 260                 return 600000 + ((selector - 0x8) * 12500);
 261         return -EINVAL;
 262 }
 263
 264 static int wm831x_buckv_select_min_voltage(struct regulator_dev *rdev,
 265                                            int min_uV, int max_uV)
 266 {
 267         u16 vsel;
 268
 269         if (min_uV < 600000)
 270                 vsel = 0;
 271         else if (min_uV <= 1800000)
 272                 vsel = ((min_uV - 600000) / 12500) + 8;
 273         else
 274                 return -EINVAL;
 275
 276         if (wm831x_buckv_list_voltage(rdev, vsel) > max_uV)
 277                 return -EINVAL;
 278
 279         return vsel;
 280 }
 281
 282 static int wm831x_buckv_select_max_voltage(struct regulator_dev *rdev,
 283                                            int min_uV, int max_uV)
 284 {
 285         u16 vsel;
 286
 287         if (max_uV < 600000 || max_uV > 1800000)
 288                 return -EINVAL;
 289
 290         vsel = ((max_uV - 600000) / 12500) + 8;
 291
 292         if (wm831x_buckv_list_voltage(rdev, vsel) < min_uV ||
 293             wm831x_buckv_list_voltage(rdev, vsel) < max_uV)
 294                 return -EINVAL;
 295
 296         return vsel;
 297 }
 298
 299 static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
 300 {
 301         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 302
 303         if (state == dcdc->dvs_gpio_state)
 304                 return 0;
 305
 306         dcdc->dvs_gpio_state = state;
 307         gpio_set_value(dcdc->dvs_gpio, state);
 308
 309         /* Should wait for DVS state change to be asserted if we have
 310          * a GPIO for it, for now assume the device is configured
 311          * for the fastest possible transition.
 312          */
 313
 314         return 0;
 315 }
 316 //wm831x_buckv_get_voltage
 317
 318 int wm831x_reg_read(struct wm831x *wm831x, unsigned short reg);
 319 static int wm831x_buckv_read_voltage(struct regulator_dev *rdev)
 320 {
 321         int vol_read;
 322         int ret;
 323         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 324         struct wm831x *wm831x = dcdc->wm831x;
 325         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 326
 327         ret = wm831x_reg_read(wm831x, on_reg);
 328         if (ret < 0)
 329                 return ret;
 330         ret &= WM831X_DC1_ON_VSEL_MASK;
 331         vol_read = (ret-8)*12500 + 600000;
 332
 333         return vol_read;
 334
 335
 336
 337 }
 338 static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
 339                                     int min_uV, int max_uV)
 340 {
 341         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 342         struct wm831x *wm831x = dcdc->wm831x;
 343         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 344         int dvs_reg = dcdc->base + WM831X_DCDC_DVS_CONTROL;
 345         int vsel, ret;
 346
 347         vsel = wm831x_buckv_select_min_voltage(rdev, min_uV, max_uV);
 348         if (vsel < 0)
 349                 return vsel;
 350
 351         /* If this value is already set then do a GPIO update if we can */
 352         if (dcdc->dvs_gpio && dcdc->on_vsel == vsel)
 353                 return wm831x_buckv_set_dvs(rdev, 0);
 354
 355         if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
 356                 return wm831x_buckv_set_dvs(rdev, 1);
 357
 358         /* Always set the ON status to the minimum voltage */
 359         ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
 360         if (ret < 0)
 361         {
 362                 dcdc->on_vsel = 0;
 363                 return ret;
 364         }
 365         dcdc->on_vsel = vsel;
 366
 367         if (!dcdc->dvs_gpio)
 368                 return ret;
 369
 370         /* Kick the voltage transition now */
 371         ret = wm831x_buckv_set_dvs(rdev, 0);
 372         if (ret < 0)
 373                 return ret;
 374
 375         /* Set the high voltage as the DVS voltage.  This is optimised
 376          * for CPUfreq usage, most processors will keep the maximum
 377          * voltage constant and lower the minimum with the frequency. */
 378         vsel = wm831x_buckv_select_max_voltage(rdev, min_uV, max_uV);
 379         if (vsel < 0) {
 380                 /* This should never happen - at worst the same vsel
 381                  * should be chosen */
 382                 WARN_ON(vsel < 0);
 383                 return 0;
 384         }
 385
 386         /* Don't bother if it's the same VSEL we're already using */
 387         if (vsel == dcdc->on_vsel)
 388                 return 0;
 389
 390         ret = wm831x_set_bits(wm831x, dvs_reg, WM831X_DC1_DVS_VSEL_MASK, vsel);
 391         if (ret == 0)
 392                 dcdc->dvs_vsel = vsel;
 393         else
 394                 dev_warn(wm831x->dev, "Failed to set DCDC DVS VSEL: %d\n",
 395                          ret);
 396
 397         return 0;
 398 }
 399
 400 static int wm831x_buckv_set_suspend_voltage(struct regulator_dev *rdev,
 401                                             int uV)
 402 {
 403         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 404         struct wm831x *wm831x = dcdc->wm831x;
 405         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 406         int vsel;
 407
 408         vsel = wm831x_buckv_select_min_voltage(rdev, uV, uV);
 409         if (vsel < 0)
 410                 return vsel;
 411
 412         return wm831x_set_bits(wm831x, reg, WM831X_DC1_SLP_VSEL_MASK, vsel);
 413 }
 414
 415 static int wm831x_buckv_get_voltage(struct regulator_dev *rdev)
 416 {
 417         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 418         struct wm831x *wm831x = dcdc->wm831x;
 419         int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 420         if (dcdc->on_vsel == 0){
 421         dcdc->on_vsel = wm831x_reg_read(wm831x,on_reg);
 422         dcdc->on_vsel = dcdc->on_vsel & WM831X_DC1_DVS_VSEL_MASK;
 423         }
 424         if (dcdc->dvs_gpio && dcdc->dvs_gpio_state)
 425                 return wm831x_buckv_list_voltage(rdev, dcdc->dvs_vsel);
 426         else
 427                 return wm831x_buckv_list_voltage(rdev, dcdc->on_vsel);
 428 }
 429
 430 /* Current limit options */
 431 static u16 wm831x_dcdc_ilim[] = {
 432         125, 250, 375, 500, 625, 750, 875, 1000
 433 };
 434
 435 static int wm831x_buckv_set_voltage_step(struct regulator_dev * rdev, int min_uV, int max_uV, unsigned *selector)
 436 {
 437         int old_vol;
 438         int new_min_uV,new_max_uV;
 439         int diff_value,step;
 440         int ret=0;
 441
 442         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 443         struct wm831x *wm831x = dcdc->wm831x;
 444         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 445
 446
 447         //if(strcmp(rdev->constraints->name,"DCDC2") != 0)
 448         if(strcmp(pdata->dcdc[1]->consumer_supplies[1].supply,"vcore") != 0)
 449         {
 450
 451                 ret = wm831x_buckv_set_voltage(rdev,min_uV,max_uV);
 452         }
 453         else
 454         {
 455                 old_vol = wm831x_buckv_read_voltage(rdev);
 456
 457                 new_min_uV = old_vol;
 458                 new_max_uV = old_vol+max_uV-min_uV;
 459
 460                 if(old_vol > min_uV) //reduce voltage
 461                 {
 462                         diff_value = (old_vol - min_uV);
 463
 464                         for(step = 100000; step<=diff_value; step += 100000)
 465                         {
 466                                 new_min_uV = old_vol-step;
 467                                 new_max_uV = old_vol+max_uV-min_uV-step;
 468
 469                                 ret = wm831x_buckv_set_voltage(rdev,new_min_uV,new_max_uV);
 470                                 usleep_range(1000,1000);
 471                         }
 472
 473                         if(new_min_uV > min_uV) //0<  old_vol - min_uV < 100000 ||0< new_min_uV  - min_uV < 1000000
 474                         {
 475
 476                                 ret = wm831x_buckv_set_voltage(rdev,min_uV,max_uV);
 477                                 usleep_range(1000,1000);
 478
 479                         }
 480
 481                 }
 482                 else                    //rise  voltage
 483                 {
 484                         diff_value = (min_uV- old_vol);
 485
 486                         for(step = 100000; step<=diff_value; step += 100000)
 487                         {
 488                                 new_min_uV = old_vol + step;
 489                                 new_max_uV = old_vol+max_uV-min_uV+step;
 490
 491                                 ret = wm831x_buckv_set_voltage(rdev,new_min_uV,new_max_uV);
 492                                 usleep_range(1000,1000);
 493                         }
 494                         if(new_min_uV < min_uV)//  min_uV - old_vol < 100000 || new_min_uV - old_vol < 100000
 495                         {
 496                                 ret = wm831x_buckv_set_voltage(rdev,min_uV,max_uV);
 497                                 usleep_range(1000,1000);
 498                         }
 499
 500                 }
 501
 502         }
 503         return ret;
 504
 505 }
 506
 507 static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
 508                                            int min_uA, int max_uA)
 509 {
 510         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 511         struct wm831x *wm831x = dcdc->wm831x;
 512         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 513         int i;
 514
 515         for (i = 0; i < ARRAY_SIZE(wm831x_dcdc_ilim); i++) {
 516                 if (max_uA <= wm831x_dcdc_ilim[i])
 517                         break;
 518         }
 519         if (i == ARRAY_SIZE(wm831x_dcdc_ilim))
 520                 return -EINVAL;
 521
 522         return wm831x_set_bits(wm831x, reg, WM831X_DC1_HC_THR_MASK, i);
 523 }
 524
 525 static int wm831x_buckv_get_current_limit(struct regulator_dev *rdev)
 526 {
 527         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 528         struct wm831x *wm831x = dcdc->wm831x;
 529         u16 reg = dcdc->base + WM831X_DCDC_CONTROL_2;
 530         int val;
 531
 532         val = wm831x_reg_read(wm831x, reg);
 533         if (val < 0)
 534                 return val;
 535
 536         return wm831x_dcdc_ilim[val & WM831X_DC1_HC_THR_MASK];
 537 }
 538
 539 int wm831x_dcdc_set_suspend_enable(struct regulator_dev *rdev)
 540 {
 541
 542         return 0;
 543 }
 544 int wm831x_dcdc_set_suspend_disable(struct regulator_dev *rdev)
 545 {
 546
 547         return 0;
 548 }
 549
 550 static struct regulator_ops wm831x_buckv_ops = {
 551         .set_voltage = wm831x_buckv_set_voltage_step,
 552         .get_voltage = wm831x_buckv_get_voltage,
 553         .list_voltage = wm831x_buckv_list_voltage,
 554         .set_suspend_voltage = wm831x_buckv_set_suspend_voltage,
 555         .set_current_limit = wm831x_buckv_set_current_limit,
 556         .get_current_limit = wm831x_buckv_get_current_limit,
 557
 558         .is_enabled = wm831x_dcdc_is_enabled,
 559         .enable = wm831x_dcdc_enable,
 560         .disable = wm831x_dcdc_disable,
 561         .get_status = wm831x_dcdc_get_status,
 562         .get_mode = wm831x_dcdc_get_mode,
 563         .set_mode = wm831x_dcdc_set_mode,
 564         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 565         .set_suspend_enable = wm831x_dcdc_set_suspend_enable,
 566         .set_suspend_disable = wm831x_dcdc_set_suspend_disable,
 567 };
 568
 569 /*
 570  * Set up DVS control.  We just log errors since we can still run
 571  * (with reduced performance) if we fail.
 572  */
 573 static __devinit void wm831x_buckv_dvs_init(struct wm831x_dcdc *dcdc,
 574                                             struct wm831x_buckv_pdata *pdata)
 575 {
 576         struct wm831x *wm831x = dcdc->wm831x;
 577         int ret;
 578         u16 ctrl;
 579
 580         if (!pdata || !pdata->dvs_gpio)
 581                 return;
 582
 583         switch (pdata->dvs_control_src) {
 584         case 1:
 585                 ctrl = 2 << WM831X_DC1_DVS_SRC_SHIFT;
 586                 break;
 587         case 2:
 588                 ctrl = 3 << WM831X_DC1_DVS_SRC_SHIFT;
 589                 break;
 590         default:
 591                 dev_err(wm831x->dev, "Invalid DVS control source %d for %s\n",
 592                         pdata->dvs_control_src, dcdc->name);
 593                 return;
 594         }
 595
 596         ret = wm831x_set_bits(wm831x, dcdc->base + WM831X_DCDC_DVS_CONTROL,
 597                               WM831X_DC1_DVS_SRC_MASK, ctrl);
 598         if (ret < 0) {
 599                 dev_err(wm831x->dev, "Failed to set %s DVS source: %d\n",
 600                         dcdc->name, ret);
 601                 return;
 602         }
 603
 604         ret = gpio_request(pdata->dvs_gpio, "DCDC DVS");
 605         if (ret < 0) {
 606                 dev_err(wm831x->dev, "Failed to get %s DVS GPIO: %d\n",
 607                         dcdc->name, ret);
 608                 return;
 609         }
 610
 611         /* gpiolib won't let us read the GPIO status so pick the higher
 612          * of the two existing voltages so we take it as platform data.
 613          */
 614         dcdc->dvs_gpio_state = pdata->dvs_init_state;
 615
 616         ret = gpio_direction_output(pdata->dvs_gpio, dcdc->dvs_gpio_state);
 617         if (ret < 0) {
 618                 dev_err(wm831x->dev, "Failed to enable %s DVS GPIO: %d\n",
 619                         dcdc->name, ret);
 620                 gpio_free(pdata->dvs_gpio);
 621                 return;
 622         }
 623
 624         dcdc->dvs_gpio = pdata->dvs_gpio;
 625 }
 626
 627 static __devinit int wm831x_buckv_probe(struct platform_device *pdev)
 628 {
 629         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 630         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 631         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 632         struct wm831x_dcdc *dcdc;
 633         struct resource *res;
 634         int ret, irq;
 635
 636         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 637
 638         if (pdata == NULL || pdata->dcdc[id] == NULL)
 639                 return -ENODEV;
 640
 641         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 642         if (dcdc == NULL) {
 643                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 644                 return -ENOMEM;
 645         }
 646
 647         dcdc->wm831x = wm831x;
 648
 649         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 650         if (res == NULL) {
 651                 dev_err(&pdev->dev, "No I/O resource\n");
 652                 ret = -EINVAL;
 653                 goto err;
 654         }
 655         dcdc->base = res->start;
 656
 657         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 658         dcdc->desc.name = dcdc->name;
 659         dcdc->desc.id = id;
 660         dcdc->desc.type = REGULATOR_VOLTAGE;
 661         dcdc->desc.n_voltages = WM831X_BUCKV_MAX_SELECTOR + 1;
 662         dcdc->desc.ops = &wm831x_buckv_ops;
 663         dcdc->desc.owner = THIS_MODULE;
 664
 665         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 666         if (ret < 0) {
 667                 dev_err(wm831x->dev, "Failed to read ON VSEL: %d\n", ret);
 668                 goto err;
 669         }
 670         dcdc->on_vsel = ret & WM831X_DC1_ON_VSEL_MASK;
 671
 672         ret = wm831x_reg_read(wm831x, dcdc->base + WM831X_DCDC_ON_CONFIG);
 673         if (ret < 0) {
 674                 dev_err(wm831x->dev, "Failed to read DVS VSEL: %d\n", ret);
 675                 goto err;
 676         }
 677         dcdc->dvs_vsel = ret & WM831X_DC1_DVS_VSEL_MASK;
 678
 679         if (pdata->dcdc[id])
 680                 wm831x_buckv_dvs_init(dcdc, pdata->dcdc[id]->driver_data);
 681
 682         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 683                                              pdata->dcdc[id], dcdc);
 684         if (IS_ERR(dcdc->regulator)) {
 685                 ret = PTR_ERR(dcdc->regulator);
 686                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 687                         id + 1, ret);
 688                 goto err;
 689         }
 690
 691         irq = platform_get_irq_byname(pdev, "UV");
 692         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 693                                  IRQF_TRIGGER_RISING, dcdc->name,
 694                                  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         irq = platform_get_irq_byname(pdev, "HC");
 702         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_oc_irq,
 703                                  IRQF_TRIGGER_RISING, dcdc->name,
 704                                  dcdc);
 705         if (ret != 0) {
 706                 dev_err(&pdev->dev, "Failed to request HC IRQ %d: %d\n",
 707                         irq, ret);
 708                 goto err_uv;
 709         }
 710
 711         platform_set_drvdata(pdev, dcdc);
 712
 713         return 0;
 714
 715 err_uv:
 716         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 717 err_regulator:
 718         regulator_unregister(dcdc->regulator);
 719 err:
 720         if (dcdc->dvs_gpio)
 721                 gpio_free(dcdc->dvs_gpio);
 722         kfree(dcdc);
 723         return ret;
 724 }
 725
 726 static __devexit int wm831x_buckv_remove(struct platform_device *pdev)
 727 {
 728         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 729         struct wm831x *wm831x = dcdc->wm831x;
 730
 731         platform_set_drvdata(pdev, NULL);
 732
 733         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "HC"), dcdc);
 734         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 735         regulator_unregister(dcdc->regulator);
 736         if (dcdc->dvs_gpio)
 737                 gpio_free(dcdc->dvs_gpio);
 738         kfree(dcdc);
 739
 740         return 0;
 741 }
 742
 743 static struct platform_driver wm831x_buckv_driver = {
 744         .probe = wm831x_buckv_probe,
 745         .remove = __devexit_p(wm831x_buckv_remove),
 746         .driver         = {
 747                 .name   = "wm831x-buckv",
 748                 .owner  = THIS_MODULE,
 749         },
 750 };
 751
 752 /*
 753  * BUCKP specifics
 754  */
 755
 756 static int wm831x_buckp_list_voltage(struct regulator_dev *rdev,
 757                                       unsigned selector)
 758 {
 759         if (selector <= WM831X_BUCKP_MAX_SELECTOR)
 760                 return 850000 + (selector * 25000);
 761         else
 762                 return -EINVAL;
 763 }
 764
 765 static int wm831x_buckp_set_voltage_int(struct regulator_dev *rdev, int reg,
 766                                         int min_uV, int max_uV)
 767 {
 768         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 769         struct wm831x *wm831x = dcdc->wm831x;
 770         u16 vsel;
 771
 772         if (min_uV <= 34000000)
 773                 vsel = (min_uV - 850000) / 25000;
 774         else
 775                 return -EINVAL;
 776
 777         if (wm831x_buckp_list_voltage(rdev, vsel) > max_uV)
 778                 return -EINVAL;
 779
 780         return wm831x_set_bits(wm831x, reg, WM831X_DC3_ON_VSEL_MASK, vsel);
 781 }
 782
 783 static int wm831x_buckp_set_voltage(struct regulator_dev *rdev,
 784                                     int min_uV, int max_uV, unsigned *selector)
 785 {
 786         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 787         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 788
 789         return wm831x_buckp_set_voltage_int(rdev, reg, min_uV, max_uV);
 790 }
 791
 792 static int wm831x_buckp_set_suspend_voltage(struct regulator_dev *rdev,
 793                                             int uV)
 794 {
 795         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 796         u16 reg = dcdc->base + WM831X_DCDC_SLEEP_CONTROL;
 797
 798         return wm831x_buckp_set_voltage_int(rdev, reg, uV, uV);
 799 }
 800
 801 static int wm831x_buckp_get_voltage(struct regulator_dev *rdev)
 802 {
 803         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 804         struct wm831x *wm831x = dcdc->wm831x;
 805         u16 reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
 806         int val;
 807
 808         val = wm831x_reg_read(wm831x, reg);
 809         if (val < 0)
 810                 return val;
 811
 812         return wm831x_buckp_list_voltage(rdev, val & WM831X_DC3_ON_VSEL_MASK);
 813 }
 814
 815 static struct regulator_ops wm831x_buckp_ops = {
 816         .set_voltage = wm831x_buckp_set_voltage,
 817         .get_voltage = wm831x_buckp_get_voltage,
 818         .list_voltage = wm831x_buckp_list_voltage,
 819         .set_suspend_voltage = wm831x_buckp_set_suspend_voltage,
 820
 821         .is_enabled = wm831x_dcdc_is_enabled,
 822         .enable = wm831x_dcdc_enable,
 823         .disable = wm831x_dcdc_disable,
 824         .get_status = wm831x_dcdc_get_status,
 825         .get_mode = wm831x_dcdc_get_mode,
 826         .set_mode = wm831x_dcdc_set_mode,
 827         .set_suspend_mode = wm831x_dcdc_set_suspend_mode,
 828         .set_suspend_enable = wm831x_dcdc_set_suspend_enable,
 829         .set_suspend_disable = wm831x_dcdc_set_suspend_disable,
 830 };
 831
 832 static __devinit int wm831x_buckp_probe(struct platform_device *pdev)
 833 {
 834         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 835         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 836         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 837         struct wm831x_dcdc *dcdc;
 838         struct resource *res;
 839         int ret, irq;
 840
 841         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 842
 843         if (pdata == NULL || pdata->dcdc[id] == NULL)
 844                 return -ENODEV;
 845
 846         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 847         if (dcdc == NULL) {
 848                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 849                 return -ENOMEM;
 850         }
 851
 852         dcdc->wm831x = wm831x;
 853
 854         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 855         if (res == NULL) {
 856                 dev_err(&pdev->dev, "No I/O resource\n");
 857                 ret = -EINVAL;
 858                 goto err;
 859         }
 860         dcdc->base = res->start;
 861
 862         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 863         dcdc->desc.name = dcdc->name;
 864         dcdc->desc.id = id;
 865         dcdc->desc.type = REGULATOR_VOLTAGE;
 866         dcdc->desc.n_voltages = WM831X_BUCKP_MAX_SELECTOR + 1;
 867         dcdc->desc.ops = &wm831x_buckp_ops;
 868         dcdc->desc.owner = THIS_MODULE;
 869
 870         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
 871                                              pdata->dcdc[id], dcdc);
 872         if (IS_ERR(dcdc->regulator)) {
 873                 ret = PTR_ERR(dcdc->regulator);
 874                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
 875                         id + 1, ret);
 876                 goto err;
 877         }
 878
 879         irq = platform_get_irq_byname(pdev, "UV");
 880         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
 881                                  IRQF_TRIGGER_RISING, dcdc->name,
 882                                  dcdc);
 883         if (ret != 0) {
 884                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
 885                         irq, ret);
 886                 goto err_regulator;
 887         }
 888
 889         platform_set_drvdata(pdev, dcdc);
 890
 891         return 0;
 892
 893 err_regulator:
 894         regulator_unregister(dcdc->regulator);
 895 err:
 896         kfree(dcdc);
 897         return ret;
 898 }
 899
 900 static __devexit int wm831x_buckp_remove(struct platform_device *pdev)
 901 {
 902         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
 903         struct wm831x *wm831x = dcdc->wm831x;
 904
 905         platform_set_drvdata(pdev, NULL);
 906
 907         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
 908         regulator_unregister(dcdc->regulator);
 909         kfree(dcdc);
 910
 911         return 0;
 912 }
 913
 914 static struct platform_driver wm831x_buckp_driver = {
 915         .probe = wm831x_buckp_probe,
 916         .remove = __devexit_p(wm831x_buckp_remove),
 917         .driver         = {
 918                 .name   = "wm831x-buckp",
 919                 .owner  = THIS_MODULE,
 920         },
 921 };
 922
 923 /*
 924  * DCDC boost convertors
 925  */
 926
 927 static int wm831x_boostp_get_status(struct regulator_dev *rdev)
 928 {
 929         struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
 930         struct wm831x *wm831x = dcdc->wm831x;
 931         int ret;
 932
 933         /* First, check for errors */
 934         ret = wm831x_reg_read(wm831x, WM831X_DCDC_UV_STATUS);
 935         if (ret < 0)
 936                 return ret;
 937
 938         if (ret & (1 << rdev_get_id(rdev))) {
 939                 dev_dbg(wm831x->dev, "DCDC%d under voltage\n",
 940                         rdev_get_id(rdev) + 1);
 941                 return REGULATOR_STATUS_ERROR;
 942         }
 943
 944         /* Is the regulator on? */
 945         ret = wm831x_reg_read(wm831x, WM831X_DCDC_STATUS);
 946         if (ret < 0)
 947                 return ret;
 948         if (ret & (1 << rdev_get_id(rdev)))
 949                 return REGULATOR_STATUS_ON;
 950         else
 951                 return REGULATOR_STATUS_OFF;
 952 }
 953
 954 static struct regulator_ops wm831x_boostp_ops = {
 955         .get_status = wm831x_boostp_get_status,
 956
 957         .is_enabled = wm831x_dcdc_is_enabled,
 958         .enable = wm831x_dcdc_enable,
 959         .disable = wm831x_dcdc_disable,
 960 };
 961
 962 static __devinit int wm831x_boostp_probe(struct platform_device *pdev)
 963 {
 964         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
 965         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
 966         int id = pdev->id % ARRAY_SIZE(pdata->dcdc);
 967         struct wm831x_dcdc *dcdc;
 968         struct resource *res;
 969         int ret, irq;
 970
 971         dev_dbg(&pdev->dev, "Probing DCDC%d\n", id + 1);
 972
 973         if (pdata == NULL || pdata->dcdc[id] == NULL)
 974                 return -ENODEV;
 975
 976         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
 977         if (dcdc == NULL) {
 978                 dev_err(&pdev->dev, "Unable to allocate private data\n");
 979                 return -ENOMEM;
 980         }
 981
 982         dcdc->wm831x = wm831x;
 983
 984         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 985         if (res == NULL) {
 986                 dev_err(&pdev->dev, "No I/O resource\n");
 987                 ret = -EINVAL;
 988                 goto err;
 989         }
 990         dcdc->base = res->start;
 991
 992         snprintf(dcdc->name, sizeof(dcdc->name), "DCDC%d", id + 1);
 993         dcdc->desc.name = dcdc->name;
 994         dcdc->desc.id = id;
 995         dcdc->desc.type = REGULATOR_VOLTAGE;
 996         dcdc->desc.ops = &wm831x_boostp_ops;
 997         dcdc->desc.owner = THIS_MODULE;
 998
 999         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
1000                                              pdata->dcdc[id], dcdc);
1001         if (IS_ERR(dcdc->regulator)) {
1002                 ret = PTR_ERR(dcdc->regulator);
1003                 dev_err(wm831x->dev, "Failed to register DCDC%d: %d\n",
1004                         id + 1, ret);
1005                 goto err;
1006         }
1007
1008         irq = platform_get_irq_byname(pdev, "UV");
1009         ret = wm831x_request_irq(wm831x, irq, wm831x_dcdc_uv_irq,
1010                                  IRQF_TRIGGER_RISING, dcdc->name,
1011                                  dcdc);
1012         if (ret != 0) {
1013                 dev_err(&pdev->dev, "Failed to request UV IRQ %d: %d\n",
1014                         irq, ret);
1015                 goto err_regulator;
1016         }
1017
1018         platform_set_drvdata(pdev, dcdc);
1019
1020         return 0;
1021
1022 err_regulator:
1023         regulator_unregister(dcdc->regulator);
1024 err:
1025         kfree(dcdc);
1026         return ret;
1027 }
1028
1029 static __devexit int wm831x_boostp_remove(struct platform_device *pdev)
1030 {
1031         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1032         struct wm831x *wm831x = dcdc->wm831x;
1033
1034         platform_set_drvdata(pdev, NULL);
1035
1036         wm831x_free_irq(wm831x, platform_get_irq_byname(pdev, "UV"), dcdc);
1037         regulator_unregister(dcdc->regulator);
1038         kfree(dcdc);
1039
1040         return 0;
1041 }
1042
1043 static struct platform_driver wm831x_boostp_driver = {
1044         .probe = wm831x_boostp_probe,
1045         .remove = __devexit_p(wm831x_boostp_remove),
1046         .driver         = {
1047                 .name   = "wm831x-boostp",
1048                 .owner  = THIS_MODULE,
1049         },
1050 };
1051
1052 /*
1053  * External Power Enable
1054  *
1055  * These aren't actually DCDCs but look like them in hardware so share
1056  * code.
1057  */
1058
1059 #define WM831X_EPE_BASE 6
1060
1061 static struct regulator_ops wm831x_epe_ops = {
1062         .is_enabled = wm831x_dcdc_is_enabled,
1063         .enable = wm831x_dcdc_enable,
1064         .disable = wm831x_dcdc_disable,
1065         .get_status = wm831x_dcdc_get_status,
1066 };
1067
1068 static __devinit int wm831x_epe_probe(struct platform_device *pdev)
1069 {
1070         struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
1071         struct wm831x_pdata *pdata = wm831x->dev->platform_data;
1072         int id = pdev->id % ARRAY_SIZE(pdata->epe);
1073         struct wm831x_dcdc *dcdc;
1074         int ret;
1075
1076         dev_dbg(&pdev->dev, "Probing EPE%d\n", id + 1);
1077
1078         if (pdata == NULL || pdata->epe[id] == NULL)
1079                 return -ENODEV;
1080
1081         dcdc = kzalloc(sizeof(struct wm831x_dcdc), GFP_KERNEL);
1082         if (dcdc == NULL) {
1083                 dev_err(&pdev->dev, "Unable to allocate private data\n");
1084                 return -ENOMEM;
1085         }
1086
1087         dcdc->wm831x = wm831x;
1088
1089         /* For current parts this is correct; probably need to revisit
1090          * in future.
1091          */
1092         snprintf(dcdc->name, sizeof(dcdc->name), "EPE%d", id + 1);
1093         dcdc->desc.name = dcdc->name;
1094         dcdc->desc.id = id + WM831X_EPE_BASE; /* Offset in DCDC registers */
1095         dcdc->desc.ops = &wm831x_epe_ops;
1096         dcdc->desc.type = REGULATOR_VOLTAGE;
1097         dcdc->desc.owner = THIS_MODULE;
1098
1099         dcdc->regulator = regulator_register(&dcdc->desc, &pdev->dev,
1100                                              pdata->epe[id], dcdc);
1101         if (IS_ERR(dcdc->regulator)) {
1102                 ret = PTR_ERR(dcdc->regulator);
1103                 dev_err(wm831x->dev, "Failed to register EPE%d: %d\n",
1104                         id + 1, ret);
1105                 goto err;
1106         }
1107
1108         platform_set_drvdata(pdev, dcdc);
1109
1110         return 0;
1111
1112 err:
1113         kfree(dcdc);
1114         return ret;
1115 }
1116
1117 static __devexit int wm831x_epe_remove(struct platform_device *pdev)
1118 {
1119         struct wm831x_dcdc *dcdc = platform_get_drvdata(pdev);
1120
1121         platform_set_drvdata(pdev, NULL);
1122
1123         regulator_unregister(dcdc->regulator);
1124         kfree(dcdc);
1125
1126         return 0;
1127 }
1128
1129 static struct platform_driver wm831x_epe_driver = {
1130         .probe = wm831x_epe_probe,
1131         .remove = __devexit_p(wm831x_epe_remove),
1132         .driver         = {
1133                 .name   = "wm831x-epe",
1134                 .owner  = THIS_MODULE,
1135         },
1136 };
1137
1138 static int __init wm831x_dcdc_init(void)
1139 {
1140         int ret;
1141         printk("%s \n", __FUNCTION__);
1142         ret = platform_driver_register(&wm831x_buckv_driver);
1143         if (ret != 0)
1144                 pr_err("Failed to register WM831x BUCKV driver: %d\n", ret);
1145
1146         ret = platform_driver_register(&wm831x_buckp_driver);
1147         if (ret != 0)
1148                 pr_err("Failed to register WM831x BUCKP driver: %d\n", ret);
1149
1150         ret = platform_driver_register(&wm831x_boostp_driver);
1151         if (ret != 0)
1152                 pr_err("Failed to register WM831x BOOST driver: %d\n", ret);
1153
1154         ret = platform_driver_register(&wm831x_epe_driver);
1155         if (ret != 0)
1156                 pr_err("Failed to register WM831x EPE driver: %d\n", ret);
1157
1158         return 0;
1159 }
1160 subsys_initcall(wm831x_dcdc_init);
1161
1162 static void __exit wm831x_dcdc_exit(void)
1163 {
1164         platform_driver_unregister(&wm831x_epe_driver);
1165         platform_driver_unregister(&wm831x_boostp_driver);
1166         platform_driver_unregister(&wm831x_buckp_driver);
1167         platform_driver_unregister(&wm831x_buckv_driver);
1168 }
1169 module_exit(wm831x_dcdc_exit);
1170
1171 /* Module information */
1172 MODULE_AUTHOR("Mark Brown");
1173 MODULE_DESCRIPTION("WM831x DC-DC convertor driver");
1174 MODULE_LICENSE("GPL");
1175 MODULE_ALIAS("platform:wm831x-buckv");
1176 MODULE_ALIAS("platform:wm831x-buckp");