drivers/mfd/twl6040-core.c

   1 /*
   2  * MFD driver for TWL6040 audio device
   3  *
   4  * Authors:     Misael Lopez Cruz <misael.lopez@ti.com>
   5  *              Jorge Eduardo Candelaria <jorge.candelaria@ti.com>
   6  *              Peter Ujfalusi <peter.ujfalusi@ti.com>
   7  *
   8  * Copyright:   (C) 2011 Texas Instruments, Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  22  * 02110-1301 USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/slab.h>
  29 #include <linux/kernel.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/gpio.h>
  32 #include <linux/delay.h>
  33 #include <linux/i2c/twl.h>
  34 #include <linux/mfd/core.h>
  35 #include <linux/mfd/twl6040.h>
  36
  37 #define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1)
  38
  39 int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
  40 {
  41         int ret;
  42         u8 val = 0;
  43
  44         mutex_lock(&twl6040->io_mutex);
  45         /* Vibra control registers from cache */
  46         if (unlikely(reg == TWL6040_REG_VIBCTLL ||
  47                      reg == TWL6040_REG_VIBCTLR)) {
  48                 val = twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)];
  49         } else {
  50                 ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
  51                 if (ret < 0) {
  52                         mutex_unlock(&twl6040->io_mutex);
  53                         return ret;
  54                 }
  55         }
  56         mutex_unlock(&twl6040->io_mutex);
  57
  58         return val;
  59 }
  60 EXPORT_SYMBOL(twl6040_reg_read);
  61
  62 int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
  63 {
  64         int ret;
  65
  66         mutex_lock(&twl6040->io_mutex);
  67         ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
  68         /* Cache the vibra control registers */
  69         if (reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR)
  70                 twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)] = val;
  71         mutex_unlock(&twl6040->io_mutex);
  72
  73         return ret;
  74 }
  75 EXPORT_SYMBOL(twl6040_reg_write);
  76
  77 int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
  78 {
  79         int ret;
  80         u8 val;
  81
  82         mutex_lock(&twl6040->io_mutex);
  83         ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
  84         if (ret)
  85                 goto out;
  86
  87         val |= mask;
  88         ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
  89 out:
  90         mutex_unlock(&twl6040->io_mutex);
  91         return ret;
  92 }
  93 EXPORT_SYMBOL(twl6040_set_bits);
  94
  95 int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
  96 {
  97         int ret;
  98         u8 val;
  99
 100         mutex_lock(&twl6040->io_mutex);
 101         ret = twl_i2c_read_u8(TWL_MODULE_AUDIO_VOICE, &val, reg);
 102         if (ret)
 103                 goto out;
 104
 105         val &= ~mask;
 106         ret = twl_i2c_write_u8(TWL_MODULE_AUDIO_VOICE, val, reg);
 107 out:
 108         mutex_unlock(&twl6040->io_mutex);
 109         return ret;
 110 }
 111 EXPORT_SYMBOL(twl6040_clear_bits);
 112
 113 /* twl6040 codec manual power-up sequence */
 114 static int twl6040_power_up(struct twl6040 *twl6040)
 115 {
 116         u8 ldoctl, ncpctl, lppllctl;
 117         int ret;
 118
 119         /* enable high-side LDO, reference system and internal oscillator */
 120         ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
 121         ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 122         if (ret)
 123                 return ret;
 124         usleep_range(10000, 10500);
 125
 126         /* enable negative charge pump */
 127         ncpctl = TWL6040_NCPENA;
 128         ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
 129         if (ret)
 130                 goto ncp_err;
 131         usleep_range(1000, 1500);
 132
 133         /* enable low-side LDO */
 134         ldoctl |= TWL6040_LSLDOENA;
 135         ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 136         if (ret)
 137                 goto lsldo_err;
 138         usleep_range(1000, 1500);
 139
 140         /* enable low-power PLL */
 141         lppllctl = TWL6040_LPLLENA;
 142         ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
 143         if (ret)
 144                 goto lppll_err;
 145         usleep_range(5000, 5500);
 146
 147         /* disable internal oscillator */
 148         ldoctl &= ~TWL6040_OSCENA;
 149         ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 150         if (ret)
 151                 goto osc_err;
 152
 153         return 0;
 154
 155 osc_err:
 156         lppllctl &= ~TWL6040_LPLLENA;
 157         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
 158 lppll_err:
 159         ldoctl &= ~TWL6040_LSLDOENA;
 160         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 161 lsldo_err:
 162         ncpctl &= ~TWL6040_NCPENA;
 163         twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
 164 ncp_err:
 165         ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
 166         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 167
 168         return ret;
 169 }
 170
 171 /* twl6040 manual power-down sequence */
 172 static void twl6040_power_down(struct twl6040 *twl6040)
 173 {
 174         u8 ncpctl, ldoctl, lppllctl;
 175
 176         ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
 177         ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
 178         lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
 179
 180         /* enable internal oscillator */
 181         ldoctl |= TWL6040_OSCENA;
 182         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 183         usleep_range(1000, 1500);
 184
 185         /* disable low-power PLL */
 186         lppllctl &= ~TWL6040_LPLLENA;
 187         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
 188
 189         /* disable low-side LDO */
 190         ldoctl &= ~TWL6040_LSLDOENA;
 191         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 192
 193         /* disable negative charge pump */
 194         ncpctl &= ~TWL6040_NCPENA;
 195         twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
 196
 197         /* disable high-side LDO, reference system and internal oscillator */
 198         ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
 199         twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 200 }
 201
 202 static irqreturn_t twl6040_naudint_handler(int irq, void *data)
 203 {
 204         struct twl6040 *twl6040 = data;
 205         u8 intid, status;
 206
 207         intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
 208
 209         if (intid & TWL6040_READYINT)
 210                 complete(&twl6040->ready);
 211
 212         if (intid & TWL6040_THINT) {
 213                 status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
 214                 if (status & TWL6040_TSHUTDET) {
 215                         dev_warn(twl6040->dev,
 216                                  "Thermal shutdown, powering-off");
 217                         twl6040_power(twl6040, 0);
 218                 } else {
 219                         dev_warn(twl6040->dev,
 220                                  "Leaving thermal shutdown, powering-on");
 221                         twl6040_power(twl6040, 1);
 222                 }
 223         }
 224
 225         return IRQ_HANDLED;
 226 }
 227
 228 static int twl6040_power_up_completion(struct twl6040 *twl6040,
 229                                        int naudint)
 230 {
 231         int time_left;
 232         u8 intid;
 233
 234         time_left = wait_for_completion_timeout(&twl6040->ready,
 235                                                 msecs_to_jiffies(144));
 236         if (!time_left) {
 237                 intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
 238                 if (!(intid & TWL6040_READYINT)) {
 239                         dev_err(twl6040->dev,
 240                                 "timeout waiting for READYINT\n");
 241                         return -ETIMEDOUT;
 242                 }
 243         }
 244
 245         return 0;
 246 }
 247
 248 int twl6040_power(struct twl6040 *twl6040, int on)
 249 {
 250         int audpwron = twl6040->audpwron;
 251         int naudint = twl6040->irq;
 252         int ret = 0;
 253
 254         mutex_lock(&twl6040->mutex);
 255
 256         if (on) {
 257                 /* already powered-up */
 258                 if (twl6040->power_count++)
 259                         goto out;
 260
 261                 if (gpio_is_valid(audpwron)) {
 262                         /* use AUDPWRON line */
 263                         gpio_set_value(audpwron, 1);
 264                         /* wait for power-up completion */
 265                         ret = twl6040_power_up_completion(twl6040, naudint);
 266                         if (ret) {
 267                                 dev_err(twl6040->dev,
 268                                         "automatic power-down failed\n");
 269                                 twl6040->power_count = 0;
 270                                 goto out;
 271                         }
 272                 } else {
 273                         /* use manual power-up sequence */
 274                         ret = twl6040_power_up(twl6040);
 275                         if (ret) {
 276                                 dev_err(twl6040->dev,
 277                                         "manual power-up failed\n");
 278                                 twl6040->power_count = 0;
 279                                 goto out;
 280                         }
 281                 }
 282                 /* Default PLL configuration after power up */
 283                 twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
 284                 twl6040->sysclk = 19200000;
 285                 twl6040->mclk = 32768;
 286         } else {
 287                 /* already powered-down */
 288                 if (!twl6040->power_count) {
 289                         dev_err(twl6040->dev,
 290                                 "device is already powered-off\n");
 291                         ret = -EPERM;
 292                         goto out;
 293                 }
 294
 295                 if (--twl6040->power_count)
 296                         goto out;
 297
 298                 if (gpio_is_valid(audpwron)) {
 299                         /* use AUDPWRON line */
 300                         gpio_set_value(audpwron, 0);
 301
 302                         /* power-down sequence latency */
 303                         usleep_range(500, 700);
 304                 } else {
 305                         /* use manual power-down sequence */
 306                         twl6040_power_down(twl6040);
 307                 }
 308                 twl6040->sysclk = 0;
 309                 twl6040->mclk = 0;
 310         }
 311
 312 out:
 313         mutex_unlock(&twl6040->mutex);
 314         return ret;
 315 }
 316 EXPORT_SYMBOL(twl6040_power);
 317
 318 int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
 319                     unsigned int freq_in, unsigned int freq_out)
 320 {
 321         u8 hppllctl, lppllctl;
 322         int ret = 0;
 323
 324         mutex_lock(&twl6040->mutex);
 325
 326         hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
 327         lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
 328
 329         /* Force full reconfiguration when switching between PLL */
 330         if (pll_id != twl6040->pll) {
 331                 twl6040->sysclk = 0;
 332                 twl6040->mclk = 0;
 333         }
 334
 335         switch (pll_id) {
 336         case TWL6040_SYSCLK_SEL_LPPLL:
 337                 /* low-power PLL divider */
 338                 /* Change the sysclk configuration only if it has been canged */
 339                 if (twl6040->sysclk != freq_out) {
 340                         switch (freq_out) {
 341                         case 17640000:
 342                                 lppllctl |= TWL6040_LPLLFIN;
 343                                 break;
 344                         case 19200000:
 345                                 lppllctl &= ~TWL6040_LPLLFIN;
 346                                 break;
 347                         default:
 348                                 dev_err(twl6040->dev,
 349                                         "freq_out %d not supported\n",
 350                                         freq_out);
 351                                 ret = -EINVAL;
 352                                 goto pll_out;
 353                         }
 354                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 355                                           lppllctl);
 356                 }
 357
 358                 /* The PLL in use has not been change, we can exit */
 359                 if (twl6040->pll == pll_id)
 360                         break;
 361
 362                 switch (freq_in) {
 363                 case 32768:
 364                         lppllctl |= TWL6040_LPLLENA;
 365                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 366                                           lppllctl);
 367                         mdelay(5);
 368                         lppllctl &= ~TWL6040_HPLLSEL;
 369                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 370                                           lppllctl);
 371                         hppllctl &= ~TWL6040_HPLLENA;
 372                         twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
 373                                           hppllctl);
 374                         break;
 375                 default:
 376                         dev_err(twl6040->dev,
 377                                 "freq_in %d not supported\n", freq_in);
 378                         ret = -EINVAL;
 379                         goto pll_out;
 380                 }
 381                 break;
 382         case TWL6040_SYSCLK_SEL_HPPLL:
 383                 /* high-performance PLL can provide only 19.2 MHz */
 384                 if (freq_out != 19200000) {
 385                         dev_err(twl6040->dev,
 386                                 "freq_out %d not supported\n", freq_out);
 387                         ret = -EINVAL;
 388                         goto pll_out;
 389                 }
 390
 391                 if (twl6040->mclk != freq_in) {
 392                         hppllctl &= ~TWL6040_MCLK_MSK;
 393
 394                         switch (freq_in) {
 395                         case 12000000:
 396                                 /* PLL enabled, active mode */
 397                                 hppllctl |= TWL6040_MCLK_12000KHZ |
 398                                             TWL6040_HPLLENA;
 399                                 break;
 400                         case 19200000:
 401                                 /*
 402                                 * PLL disabled
 403                                 * (enable PLL if MCLK jitter quality
 404                                 *  doesn't meet specification)
 405                                 */
 406                                 hppllctl |= TWL6040_MCLK_19200KHZ;
 407                                 break;
 408                         case 26000000:
 409                                 /* PLL enabled, active mode */
 410                                 hppllctl |= TWL6040_MCLK_26000KHZ |
 411                                             TWL6040_HPLLENA;
 412                                 break;
 413                         case 38400000:
 414                                 /* PLL enabled, active mode */
 415                                 hppllctl |= TWL6040_MCLK_38400KHZ |
 416                                             TWL6040_HPLLENA;
 417                                 break;
 418                         default:
 419                                 dev_err(twl6040->dev,
 420                                         "freq_in %d not supported\n", freq_in);
 421                                 ret = -EINVAL;
 422                                 goto pll_out;
 423                         }
 424
 425                         /*
 426                          * enable clock slicer to ensure input waveform is
 427                          * square
 428                          */
 429                         hppllctl |= TWL6040_HPLLSQRENA;
 430
 431                         twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
 432                                           hppllctl);
 433                         usleep_range(500, 700);
 434                         lppllctl |= TWL6040_HPLLSEL;
 435                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 436                                           lppllctl);
 437                         lppllctl &= ~TWL6040_LPLLENA;
 438                         twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 439                                           lppllctl);
 440                 }
 441                 break;
 442         default:
 443                 dev_err(twl6040->dev, "unknown pll id %d\n", pll_id);
 444                 ret = -EINVAL;
 445                 goto pll_out;
 446         }
 447
 448         twl6040->sysclk = freq_out;
 449         twl6040->mclk = freq_in;
 450         twl6040->pll = pll_id;
 451
 452 pll_out:
 453         mutex_unlock(&twl6040->mutex);
 454         return ret;
 455 }
 456 EXPORT_SYMBOL(twl6040_set_pll);
 457
 458 int twl6040_get_pll(struct twl6040 *twl6040)
 459 {
 460         if (twl6040->power_count)
 461                 return twl6040->pll;
 462         else
 463                 return -ENODEV;
 464 }
 465 EXPORT_SYMBOL(twl6040_get_pll);
 466
 467 unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
 468 {
 469         return twl6040->sysclk;
 470 }
 471 EXPORT_SYMBOL(twl6040_get_sysclk);
 472
 473 /* Get the combined status of the vibra control register */
 474 int twl6040_get_vibralr_status(struct twl6040 *twl6040)
 475 {
 476         u8 status;
 477
 478         status = twl6040->vibra_ctrl_cache[0] | twl6040->vibra_ctrl_cache[1];
 479         status &= (TWL6040_VIBENA | TWL6040_VIBSEL);
 480
 481         return status;
 482 }
 483 EXPORT_SYMBOL(twl6040_get_vibralr_status);
 484
 485 static struct resource twl6040_vibra_rsrc[] = {
 486         {
 487                 .flags = IORESOURCE_IRQ,
 488         },
 489 };
 490
 491 static struct resource twl6040_codec_rsrc[] = {
 492         {
 493                 .flags = IORESOURCE_IRQ,
 494         },
 495 };
 496
 497 static int __devinit twl6040_probe(struct platform_device *pdev)
 498 {
 499         struct twl4030_audio_data *pdata = pdev->dev.platform_data;
 500         struct twl6040 *twl6040;
 501         struct mfd_cell *cell = NULL;
 502         int ret, children = 0;
 503
 504         if (!pdata) {
 505                 dev_err(&pdev->dev, "Platform data is missing\n");
 506                 return -EINVAL;
 507         }
 508
 509         /* In order to operate correctly we need valid interrupt config */
 510         if (!pdata->naudint_irq || !pdata->irq_base) {
 511                 dev_err(&pdev->dev, "Invalid IRQ configuration\n");
 512                 return -EINVAL;
 513         }
 514
 515         twl6040 = kzalloc(sizeof(struct twl6040), GFP_KERNEL);
 516         if (!twl6040)
 517                 return -ENOMEM;
 518
 519         platform_set_drvdata(pdev, twl6040);
 520
 521         twl6040->dev = &pdev->dev;
 522         twl6040->irq = pdata->naudint_irq;
 523         twl6040->irq_base = pdata->irq_base;
 524
 525         mutex_init(&twl6040->mutex);
 526         mutex_init(&twl6040->io_mutex);
 527         init_completion(&twl6040->ready);
 528
 529         twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
 530
 531         /* ERRATA: Automatic power-up is not possible in ES1.0 */
 532         if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0)
 533                 twl6040->audpwron = pdata->audpwron_gpio;
 534         else
 535                 twl6040->audpwron = -EINVAL;
 536
 537         if (gpio_is_valid(twl6040->audpwron)) {
 538                 ret = gpio_request_one(twl6040->audpwron, GPIOF_OUT_INIT_LOW,
 539                                        "audpwron");
 540                 if (ret)
 541                         goto gpio1_err;
 542         }
 543
 544         /* codec interrupt */
 545         ret = twl6040_irq_init(twl6040);
 546         if (ret)
 547                 goto gpio2_err;
 548
 549         ret = request_threaded_irq(twl6040->irq_base + TWL6040_IRQ_READY,
 550                                    NULL, twl6040_naudint_handler, 0,
 551                                    "twl6040_irq_ready", twl6040);
 552         if (ret) {
 553                 dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
 554                         ret);
 555                 goto irq_err;
 556         }
 557
 558         /* dual-access registers controlled by I2C only */
 559         twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);
 560
 561         if (pdata->codec) {
 562                 int irq = twl6040->irq_base + TWL6040_IRQ_PLUG;
 563
 564                 cell = &twl6040->cells[children];
 565                 cell->name = "twl6040-codec";
 566                 twl6040_codec_rsrc[0].start = irq;
 567                 twl6040_codec_rsrc[0].end = irq;
 568                 cell->resources = twl6040_codec_rsrc;
 569                 cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
 570                 cell->platform_data = pdata->codec;
 571                 cell->pdata_size = sizeof(*pdata->codec);
 572                 children++;
 573         }
 574
 575         if (pdata->vibra) {
 576                 int irq = twl6040->irq_base + TWL6040_IRQ_VIB;
 577
 578                 cell = &twl6040->cells[children];
 579                 cell->name = "twl6040-vibra";
 580                 twl6040_vibra_rsrc[0].start = irq;
 581                 twl6040_vibra_rsrc[0].end = irq;
 582                 cell->resources = twl6040_vibra_rsrc;
 583                 cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc);
 584
 585                 cell->platform_data = pdata->vibra;
 586                 cell->pdata_size = sizeof(*pdata->vibra);
 587                 children++;
 588         }
 589
 590         if (children) {
 591                 ret = mfd_add_devices(&pdev->dev, pdev->id, twl6040->cells,
 592                                       children, NULL, 0);
 593                 if (ret)
 594                         goto mfd_err;
 595         } else {
 596                 dev_err(&pdev->dev, "No platform data found for children\n");
 597                 ret = -ENODEV;
 598                 goto mfd_err;
 599         }
 600
 601         return 0;
 602
 603 mfd_err:
 604         free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
 605 irq_err:
 606         twl6040_irq_exit(twl6040);
 607 gpio2_err:
 608         if (gpio_is_valid(twl6040->audpwron))
 609                 gpio_free(twl6040->audpwron);
 610 gpio1_err:
 611         platform_set_drvdata(pdev, NULL);
 612         kfree(twl6040);
 613         return ret;
 614 }
 615
 616 static int __devexit twl6040_remove(struct platform_device *pdev)
 617 {
 618         struct twl6040 *twl6040 = platform_get_drvdata(pdev);
 619
 620         if (twl6040->power_count)
 621                 twl6040_power(twl6040, 0);
 622
 623         if (gpio_is_valid(twl6040->audpwron))
 624                 gpio_free(twl6040->audpwron);
 625
 626         free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
 627         twl6040_irq_exit(twl6040);
 628
 629         mfd_remove_devices(&pdev->dev);
 630         platform_set_drvdata(pdev, NULL);
 631         kfree(twl6040);
 632
 633         return 0;
 634 }
 635
 636 static struct platform_driver twl6040_driver = {
 637         .probe          = twl6040_probe,
 638         .remove         = __devexit_p(twl6040_remove),
 639         .driver         = {
 640                 .owner  = THIS_MODULE,
 641                 .name   = "twl6040",
 642         },
 643 };
 644
 645 module_platform_driver(twl6040_driver);
 646
 647 MODULE_DESCRIPTION("TWL6040 MFD");
 648 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
 649 MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
 650 MODULE_LICENSE("GPL");
 651 MODULE_ALIAS("platform:twl6040");