linux/drivers/mfd/twl6040-core.c
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   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/err.h>
  31#include <linux/platform_device.h>
  32#include <linux/of.h>
  33#include <linux/of_irq.h>
  34#include <linux/of_gpio.h>
  35#include <linux/of_platform.h>
  36#include <linux/gpio.h>
  37#include <linux/delay.h>
  38#include <linux/i2c.h>
  39#include <linux/regmap.h>
  40#include <linux/err.h>
  41#include <linux/mfd/core.h>
  42#include <linux/mfd/twl6040.h>
  43#include <linux/regulator/consumer.h>
  44
  45#define VIBRACTRL_MEMBER(reg) ((reg == TWL6040_REG_VIBCTLL) ? 0 : 1)
  46#define TWL6040_NUM_SUPPLIES    (2)
  47
  48static bool twl6040_has_vibra(struct twl6040_platform_data *pdata,
  49                              struct device_node *node)
  50{
  51        if (pdata && pdata->vibra)
  52                return true;
  53
  54#ifdef CONFIG_OF
  55        if (of_find_node_by_name(node, "vibra"))
  56                return true;
  57#endif
  58
  59        return false;
  60}
  61
  62int twl6040_reg_read(struct twl6040 *twl6040, unsigned int reg)
  63{
  64        int ret;
  65        unsigned int val;
  66
  67        /* Vibra control registers from cache */
  68        if (unlikely(reg == TWL6040_REG_VIBCTLL ||
  69                     reg == TWL6040_REG_VIBCTLR)) {
  70                val = twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)];
  71        } else {
  72                ret = regmap_read(twl6040->regmap, reg, &val);
  73                if (ret < 0)
  74                        return ret;
  75        }
  76
  77        return val;
  78}
  79EXPORT_SYMBOL(twl6040_reg_read);
  80
  81int twl6040_reg_write(struct twl6040 *twl6040, unsigned int reg, u8 val)
  82{
  83        int ret;
  84
  85        ret = regmap_write(twl6040->regmap, reg, val);
  86        /* Cache the vibra control registers */
  87        if (reg == TWL6040_REG_VIBCTLL || reg == TWL6040_REG_VIBCTLR)
  88                twl6040->vibra_ctrl_cache[VIBRACTRL_MEMBER(reg)] = val;
  89
  90        return ret;
  91}
  92EXPORT_SYMBOL(twl6040_reg_write);
  93
  94int twl6040_set_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
  95{
  96        return regmap_update_bits(twl6040->regmap, reg, mask, mask);
  97}
  98EXPORT_SYMBOL(twl6040_set_bits);
  99
 100int twl6040_clear_bits(struct twl6040 *twl6040, unsigned int reg, u8 mask)
 101{
 102        return regmap_update_bits(twl6040->regmap, reg, mask, 0);
 103}
 104EXPORT_SYMBOL(twl6040_clear_bits);
 105
 106/* twl6040 codec manual power-up sequence */
 107static int twl6040_power_up(struct twl6040 *twl6040)
 108{
 109        u8 ldoctl, ncpctl, lppllctl;
 110        int ret;
 111
 112        /* enable high-side LDO, reference system and internal oscillator */
 113        ldoctl = TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA;
 114        ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 115        if (ret)
 116                return ret;
 117        usleep_range(10000, 10500);
 118
 119        /* enable negative charge pump */
 120        ncpctl = TWL6040_NCPENA;
 121        ret = twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
 122        if (ret)
 123                goto ncp_err;
 124        usleep_range(1000, 1500);
 125
 126        /* enable low-side LDO */
 127        ldoctl |= TWL6040_LSLDOENA;
 128        ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 129        if (ret)
 130                goto lsldo_err;
 131        usleep_range(1000, 1500);
 132
 133        /* enable low-power PLL */
 134        lppllctl = TWL6040_LPLLENA;
 135        ret = twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
 136        if (ret)
 137                goto lppll_err;
 138        usleep_range(5000, 5500);
 139
 140        /* disable internal oscillator */
 141        ldoctl &= ~TWL6040_OSCENA;
 142        ret = twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 143        if (ret)
 144                goto osc_err;
 145
 146        return 0;
 147
 148osc_err:
 149        lppllctl &= ~TWL6040_LPLLENA;
 150        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
 151lppll_err:
 152        ldoctl &= ~TWL6040_LSLDOENA;
 153        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 154lsldo_err:
 155        ncpctl &= ~TWL6040_NCPENA;
 156        twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
 157ncp_err:
 158        ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
 159        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 160
 161        return ret;
 162}
 163
 164/* twl6040 manual power-down sequence */
 165static void twl6040_power_down(struct twl6040 *twl6040)
 166{
 167        u8 ncpctl, ldoctl, lppllctl;
 168
 169        ncpctl = twl6040_reg_read(twl6040, TWL6040_REG_NCPCTL);
 170        ldoctl = twl6040_reg_read(twl6040, TWL6040_REG_LDOCTL);
 171        lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
 172
 173        /* enable internal oscillator */
 174        ldoctl |= TWL6040_OSCENA;
 175        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 176        usleep_range(1000, 1500);
 177
 178        /* disable low-power PLL */
 179        lppllctl &= ~TWL6040_LPLLENA;
 180        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL, lppllctl);
 181
 182        /* disable low-side LDO */
 183        ldoctl &= ~TWL6040_LSLDOENA;
 184        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 185
 186        /* disable negative charge pump */
 187        ncpctl &= ~TWL6040_NCPENA;
 188        twl6040_reg_write(twl6040, TWL6040_REG_NCPCTL, ncpctl);
 189
 190        /* disable high-side LDO, reference system and internal oscillator */
 191        ldoctl &= ~(TWL6040_HSLDOENA | TWL6040_REFENA | TWL6040_OSCENA);
 192        twl6040_reg_write(twl6040, TWL6040_REG_LDOCTL, ldoctl);
 193}
 194
 195static irqreturn_t twl6040_naudint_handler(int irq, void *data)
 196{
 197        struct twl6040 *twl6040 = data;
 198        u8 intid, status;
 199
 200        intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
 201
 202        if (intid & TWL6040_READYINT)
 203                complete(&twl6040->ready);
 204
 205        if (intid & TWL6040_THINT) {
 206                status = twl6040_reg_read(twl6040, TWL6040_REG_STATUS);
 207                if (status & TWL6040_TSHUTDET) {
 208                        dev_warn(twl6040->dev,
 209                                 "Thermal shutdown, powering-off");
 210                        twl6040_power(twl6040, 0);
 211                } else {
 212                        dev_warn(twl6040->dev,
 213                                 "Leaving thermal shutdown, powering-on");
 214                        twl6040_power(twl6040, 1);
 215                }
 216        }
 217
 218        return IRQ_HANDLED;
 219}
 220
 221static int twl6040_power_up_completion(struct twl6040 *twl6040,
 222                                       int naudint)
 223{
 224        int time_left;
 225        u8 intid;
 226
 227        time_left = wait_for_completion_timeout(&twl6040->ready,
 228                                                msecs_to_jiffies(144));
 229        if (!time_left) {
 230                intid = twl6040_reg_read(twl6040, TWL6040_REG_INTID);
 231                if (!(intid & TWL6040_READYINT)) {
 232                        dev_err(twl6040->dev,
 233                                "timeout waiting for READYINT\n");
 234                        return -ETIMEDOUT;
 235                }
 236        }
 237
 238        return 0;
 239}
 240
 241int twl6040_power(struct twl6040 *twl6040, int on)
 242{
 243        int audpwron = twl6040->audpwron;
 244        int naudint = twl6040->irq;
 245        int ret = 0;
 246
 247        mutex_lock(&twl6040->mutex);
 248
 249        if (on) {
 250                /* already powered-up */
 251                if (twl6040->power_count++)
 252                        goto out;
 253
 254                if (gpio_is_valid(audpwron)) {
 255                        /* use AUDPWRON line */
 256                        gpio_set_value(audpwron, 1);
 257                        /* wait for power-up completion */
 258                        ret = twl6040_power_up_completion(twl6040, naudint);
 259                        if (ret) {
 260                                dev_err(twl6040->dev,
 261                                        "automatic power-down failed\n");
 262                                twl6040->power_count = 0;
 263                                goto out;
 264                        }
 265                } else {
 266                        /* use manual power-up sequence */
 267                        ret = twl6040_power_up(twl6040);
 268                        if (ret) {
 269                                dev_err(twl6040->dev,
 270                                        "manual power-up failed\n");
 271                                twl6040->power_count = 0;
 272                                goto out;
 273                        }
 274                }
 275                /* Default PLL configuration after power up */
 276                twl6040->pll = TWL6040_SYSCLK_SEL_LPPLL;
 277                twl6040->sysclk = 19200000;
 278                twl6040->mclk = 32768;
 279        } else {
 280                /* already powered-down */
 281                if (!twl6040->power_count) {
 282                        dev_err(twl6040->dev,
 283                                "device is already powered-off\n");
 284                        ret = -EPERM;
 285                        goto out;
 286                }
 287
 288                if (--twl6040->power_count)
 289                        goto out;
 290
 291                if (gpio_is_valid(audpwron)) {
 292                        /* use AUDPWRON line */
 293                        gpio_set_value(audpwron, 0);
 294
 295                        /* power-down sequence latency */
 296                        usleep_range(500, 700);
 297                } else {
 298                        /* use manual power-down sequence */
 299                        twl6040_power_down(twl6040);
 300                }
 301                twl6040->sysclk = 0;
 302                twl6040->mclk = 0;
 303        }
 304
 305out:
 306        mutex_unlock(&twl6040->mutex);
 307        return ret;
 308}
 309EXPORT_SYMBOL(twl6040_power);
 310
 311int twl6040_set_pll(struct twl6040 *twl6040, int pll_id,
 312                    unsigned int freq_in, unsigned int freq_out)
 313{
 314        u8 hppllctl, lppllctl;
 315        int ret = 0;
 316
 317        mutex_lock(&twl6040->mutex);
 318
 319        hppllctl = twl6040_reg_read(twl6040, TWL6040_REG_HPPLLCTL);
 320        lppllctl = twl6040_reg_read(twl6040, TWL6040_REG_LPPLLCTL);
 321
 322        /* Force full reconfiguration when switching between PLL */
 323        if (pll_id != twl6040->pll) {
 324                twl6040->sysclk = 0;
 325                twl6040->mclk = 0;
 326        }
 327
 328        switch (pll_id) {
 329        case TWL6040_SYSCLK_SEL_LPPLL:
 330                /* low-power PLL divider */
 331                /* Change the sysclk configuration only if it has been canged */
 332                if (twl6040->sysclk != freq_out) {
 333                        switch (freq_out) {
 334                        case 17640000:
 335                                lppllctl |= TWL6040_LPLLFIN;
 336                                break;
 337                        case 19200000:
 338                                lppllctl &= ~TWL6040_LPLLFIN;
 339                                break;
 340                        default:
 341                                dev_err(twl6040->dev,
 342                                        "freq_out %d not supported\n",
 343                                        freq_out);
 344                                ret = -EINVAL;
 345                                goto pll_out;
 346                        }
 347                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 348                                          lppllctl);
 349                }
 350
 351                /* The PLL in use has not been change, we can exit */
 352                if (twl6040->pll == pll_id)
 353                        break;
 354
 355                switch (freq_in) {
 356                case 32768:
 357                        lppllctl |= TWL6040_LPLLENA;
 358                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 359                                          lppllctl);
 360                        mdelay(5);
 361                        lppllctl &= ~TWL6040_HPLLSEL;
 362                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 363                                          lppllctl);
 364                        hppllctl &= ~TWL6040_HPLLENA;
 365                        twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
 366                                          hppllctl);
 367                        break;
 368                default:
 369                        dev_err(twl6040->dev,
 370                                "freq_in %d not supported\n", freq_in);
 371                        ret = -EINVAL;
 372                        goto pll_out;
 373                }
 374                break;
 375        case TWL6040_SYSCLK_SEL_HPPLL:
 376                /* high-performance PLL can provide only 19.2 MHz */
 377                if (freq_out != 19200000) {
 378                        dev_err(twl6040->dev,
 379                                "freq_out %d not supported\n", freq_out);
 380                        ret = -EINVAL;
 381                        goto pll_out;
 382                }
 383
 384                if (twl6040->mclk != freq_in) {
 385                        hppllctl &= ~TWL6040_MCLK_MSK;
 386
 387                        switch (freq_in) {
 388                        case 12000000:
 389                                /* PLL enabled, active mode */
 390                                hppllctl |= TWL6040_MCLK_12000KHZ |
 391                                            TWL6040_HPLLENA;
 392                                break;
 393                        case 19200000:
 394                                /*
 395                                * PLL disabled
 396                                * (enable PLL if MCLK jitter quality
 397                                *  doesn't meet specification)
 398                                */
 399                                hppllctl |= TWL6040_MCLK_19200KHZ;
 400                                break;
 401                        case 26000000:
 402                                /* PLL enabled, active mode */
 403                                hppllctl |= TWL6040_MCLK_26000KHZ |
 404                                            TWL6040_HPLLENA;
 405                                break;
 406                        case 38400000:
 407                                /* PLL enabled, active mode */
 408                                hppllctl |= TWL6040_MCLK_38400KHZ |
 409                                            TWL6040_HPLLENA;
 410                                break;
 411                        default:
 412                                dev_err(twl6040->dev,
 413                                        "freq_in %d not supported\n", freq_in);
 414                                ret = -EINVAL;
 415                                goto pll_out;
 416                        }
 417
 418                        /*
 419                         * enable clock slicer to ensure input waveform is
 420                         * square
 421                         */
 422                        hppllctl |= TWL6040_HPLLSQRENA;
 423
 424                        twl6040_reg_write(twl6040, TWL6040_REG_HPPLLCTL,
 425                                          hppllctl);
 426                        usleep_range(500, 700);
 427                        lppllctl |= TWL6040_HPLLSEL;
 428                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 429                                          lppllctl);
 430                        lppllctl &= ~TWL6040_LPLLENA;
 431                        twl6040_reg_write(twl6040, TWL6040_REG_LPPLLCTL,
 432                                          lppllctl);
 433                }
 434                break;
 435        default:
 436                dev_err(twl6040->dev, "unknown pll id %d\n", pll_id);
 437                ret = -EINVAL;
 438                goto pll_out;
 439        }
 440
 441        twl6040->sysclk = freq_out;
 442        twl6040->mclk = freq_in;
 443        twl6040->pll = pll_id;
 444
 445pll_out:
 446        mutex_unlock(&twl6040->mutex);
 447        return ret;
 448}
 449EXPORT_SYMBOL(twl6040_set_pll);
 450
 451int twl6040_get_pll(struct twl6040 *twl6040)
 452{
 453        if (twl6040->power_count)
 454                return twl6040->pll;
 455        else
 456                return -ENODEV;
 457}
 458EXPORT_SYMBOL(twl6040_get_pll);
 459
 460unsigned int twl6040_get_sysclk(struct twl6040 *twl6040)
 461{
 462        return twl6040->sysclk;
 463}
 464EXPORT_SYMBOL(twl6040_get_sysclk);
 465
 466/* Get the combined status of the vibra control register */
 467int twl6040_get_vibralr_status(struct twl6040 *twl6040)
 468{
 469        u8 status;
 470
 471        status = twl6040->vibra_ctrl_cache[0] | twl6040->vibra_ctrl_cache[1];
 472        status &= (TWL6040_VIBENA | TWL6040_VIBSEL);
 473
 474        return status;
 475}
 476EXPORT_SYMBOL(twl6040_get_vibralr_status);
 477
 478static struct resource twl6040_vibra_rsrc[] = {
 479        {
 480                .flags = IORESOURCE_IRQ,
 481        },
 482};
 483
 484static struct resource twl6040_codec_rsrc[] = {
 485        {
 486                .flags = IORESOURCE_IRQ,
 487        },
 488};
 489
 490static bool twl6040_readable_reg(struct device *dev, unsigned int reg)
 491{
 492        /* Register 0 is not readable */
 493        if (!reg)
 494                return false;
 495        return true;
 496}
 497
 498static struct regmap_config twl6040_regmap_config = {
 499        .reg_bits = 8,
 500        .val_bits = 8,
 501        .max_register = TWL6040_REG_STATUS, /* 0x2e */
 502
 503        .readable_reg = twl6040_readable_reg,
 504};
 505
 506static int __devinit twl6040_probe(struct i2c_client *client,
 507                                     const struct i2c_device_id *id)
 508{
 509        struct twl6040_platform_data *pdata = client->dev.platform_data;
 510        struct device_node *node = client->dev.of_node;
 511        struct twl6040 *twl6040;
 512        struct mfd_cell *cell = NULL;
 513        int irq, ret, children = 0;
 514
 515        if (!pdata && !node) {
 516                dev_err(&client->dev, "Platform data is missing\n");
 517                return -EINVAL;
 518        }
 519
 520        /* In order to operate correctly we need valid interrupt config */
 521        if (!client->irq) {
 522                dev_err(&client->dev, "Invalid IRQ configuration\n");
 523                return -EINVAL;
 524        }
 525
 526        twl6040 = devm_kzalloc(&client->dev, sizeof(struct twl6040),
 527                               GFP_KERNEL);
 528        if (!twl6040) {
 529                ret = -ENOMEM;
 530                goto err;
 531        }
 532
 533        twl6040->regmap = devm_regmap_init_i2c(client, &twl6040_regmap_config);
 534        if (IS_ERR(twl6040->regmap)) {
 535                ret = PTR_ERR(twl6040->regmap);
 536                goto err;
 537        }
 538
 539        i2c_set_clientdata(client, twl6040);
 540
 541        twl6040->supplies[0].supply = "vio";
 542        twl6040->supplies[1].supply = "v2v1";
 543        ret = regulator_bulk_get(&client->dev, TWL6040_NUM_SUPPLIES,
 544                                 twl6040->supplies);
 545        if (ret != 0) {
 546                dev_err(&client->dev, "Failed to get supplies: %d\n", ret);
 547                goto regulator_get_err;
 548        }
 549
 550        ret = regulator_bulk_enable(TWL6040_NUM_SUPPLIES, twl6040->supplies);
 551        if (ret != 0) {
 552                dev_err(&client->dev, "Failed to enable supplies: %d\n", ret);
 553                goto power_err;
 554        }
 555
 556        twl6040->dev = &client->dev;
 557        twl6040->irq = client->irq;
 558
 559        mutex_init(&twl6040->mutex);
 560        init_completion(&twl6040->ready);
 561
 562        twl6040->rev = twl6040_reg_read(twl6040, TWL6040_REG_ASICREV);
 563
 564        /* ERRATA: Automatic power-up is not possible in ES1.0 */
 565        if (twl6040_get_revid(twl6040) > TWL6040_REV_ES1_0) {
 566                if (pdata)
 567                        twl6040->audpwron = pdata->audpwron_gpio;
 568                else
 569                        twl6040->audpwron = of_get_named_gpio(node,
 570                                                "ti,audpwron-gpio", 0);
 571        } else
 572                twl6040->audpwron = -EINVAL;
 573
 574        if (gpio_is_valid(twl6040->audpwron)) {
 575                ret = gpio_request_one(twl6040->audpwron, GPIOF_OUT_INIT_LOW,
 576                                       "audpwron");
 577                if (ret)
 578                        goto gpio_err;
 579        }
 580
 581        /* codec interrupt */
 582        ret = twl6040_irq_init(twl6040);
 583        if (ret)
 584                goto irq_init_err;
 585
 586        ret = request_threaded_irq(twl6040->irq_base + TWL6040_IRQ_READY,
 587                                   NULL, twl6040_naudint_handler, IRQF_ONESHOT,
 588                                   "twl6040_irq_ready", twl6040);
 589        if (ret) {
 590                dev_err(twl6040->dev, "READY IRQ request failed: %d\n",
 591                        ret);
 592                goto irq_err;
 593        }
 594
 595        /* dual-access registers controlled by I2C only */
 596        twl6040_set_bits(twl6040, TWL6040_REG_ACCCTL, TWL6040_I2CSEL);
 597
 598        /*
 599         * The main functionality of twl6040 to provide audio on OMAP4+ systems.
 600         * We can add the ASoC codec child whenever this driver has been loaded.
 601         * The ASoC codec can work without pdata, pass the platform_data only if
 602         * it has been provided.
 603         */
 604        irq = twl6040->irq_base + TWL6040_IRQ_PLUG;
 605        cell = &twl6040->cells[children];
 606        cell->name = "twl6040-codec";
 607        twl6040_codec_rsrc[0].start = irq;
 608        twl6040_codec_rsrc[0].end = irq;
 609        cell->resources = twl6040_codec_rsrc;
 610        cell->num_resources = ARRAY_SIZE(twl6040_codec_rsrc);
 611        if (pdata && pdata->codec) {
 612                cell->platform_data = pdata->codec;
 613                cell->pdata_size = sizeof(*pdata->codec);
 614        }
 615        children++;
 616
 617        if (twl6040_has_vibra(pdata, node)) {
 618                irq = twl6040->irq_base + TWL6040_IRQ_VIB;
 619
 620                cell = &twl6040->cells[children];
 621                cell->name = "twl6040-vibra";
 622                twl6040_vibra_rsrc[0].start = irq;
 623                twl6040_vibra_rsrc[0].end = irq;
 624                cell->resources = twl6040_vibra_rsrc;
 625                cell->num_resources = ARRAY_SIZE(twl6040_vibra_rsrc);
 626
 627                if (pdata && pdata->vibra) {
 628                        cell->platform_data = pdata->vibra;
 629                        cell->pdata_size = sizeof(*pdata->vibra);
 630                }
 631                children++;
 632        }
 633
 634        /*
 635         * Enable the GPO driver in the following cases:
 636         * DT booted kernel or legacy boot with valid gpo platform_data
 637         */
 638        if (!pdata || (pdata && pdata->gpo)) {
 639                cell = &twl6040->cells[children];
 640                cell->name = "twl6040-gpo";
 641
 642                if (pdata) {
 643                        cell->platform_data = pdata->gpo;
 644                        cell->pdata_size = sizeof(*pdata->gpo);
 645                }
 646                children++;
 647        }
 648
 649        ret = mfd_add_devices(&client->dev, -1, twl6040->cells, children,
 650                              NULL, 0, NULL);
 651        if (ret)
 652                goto mfd_err;
 653
 654        return 0;
 655
 656mfd_err:
 657        free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
 658irq_err:
 659        twl6040_irq_exit(twl6040);
 660irq_init_err:
 661        if (gpio_is_valid(twl6040->audpwron))
 662                gpio_free(twl6040->audpwron);
 663gpio_err:
 664        regulator_bulk_disable(TWL6040_NUM_SUPPLIES, twl6040->supplies);
 665power_err:
 666        regulator_bulk_free(TWL6040_NUM_SUPPLIES, twl6040->supplies);
 667regulator_get_err:
 668        i2c_set_clientdata(client, NULL);
 669err:
 670        return ret;
 671}
 672
 673static int __devexit twl6040_remove(struct i2c_client *client)
 674{
 675        struct twl6040 *twl6040 = i2c_get_clientdata(client);
 676
 677        if (twl6040->power_count)
 678                twl6040_power(twl6040, 0);
 679
 680        if (gpio_is_valid(twl6040->audpwron))
 681                gpio_free(twl6040->audpwron);
 682
 683        free_irq(twl6040->irq_base + TWL6040_IRQ_READY, twl6040);
 684        twl6040_irq_exit(twl6040);
 685
 686        mfd_remove_devices(&client->dev);
 687        i2c_set_clientdata(client, NULL);
 688
 689        regulator_bulk_disable(TWL6040_NUM_SUPPLIES, twl6040->supplies);
 690        regulator_bulk_free(TWL6040_NUM_SUPPLIES, twl6040->supplies);
 691
 692        return 0;
 693}
 694
 695static const struct i2c_device_id twl6040_i2c_id[] = {
 696        { "twl6040", 0, },
 697        { "twl6041", 0, },
 698        { },
 699};
 700MODULE_DEVICE_TABLE(i2c, twl6040_i2c_id);
 701
 702static struct i2c_driver twl6040_driver = {
 703        .driver = {
 704                .name = "twl6040",
 705                .owner = THIS_MODULE,
 706        },
 707        .probe          = twl6040_probe,
 708        .remove         = __devexit_p(twl6040_remove),
 709        .id_table       = twl6040_i2c_id,
 710};
 711
 712module_i2c_driver(twl6040_driver);
 713
 714MODULE_DESCRIPTION("TWL6040 MFD");
 715MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
 716MODULE_AUTHOR("Jorge Eduardo Candelaria <jorge.candelaria@ti.com>");
 717MODULE_LICENSE("GPL");
 718MODULE_ALIAS("platform:twl6040");
 719
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