drivers/mfd/88pm800.c

   1 /*
   2  * Base driver for Marvell 88PM800
   3  *
   4  * Copyright (C) 2012 Marvell International Ltd.
   5  * Haojian Zhuang <haojian.zhuang@marvell.com>
   6  * Joseph(Yossi) Hanin <yhanin@marvell.com>
   7  * Qiao Zhou <zhouqiao@marvell.com>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General
  10  * Public License. See the file "COPYING" in the main directory of this
  11  * archive for more details.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/i2c.h>
  26 #include <linux/mfd/core.h>
  27 #include <linux/mfd/88pm80x.h>
  28 #include <linux/slab.h>
  29
  30 #define PM800_CHIP_ID                   (0x00)
  31
  32 /* Interrupt Registers */
  33 #define PM800_INT_STATUS1               (0x05)
  34 #define PM800_ONKEY_INT_STS1            (1 << 0)
  35 #define PM800_EXTON_INT_STS1            (1 << 1)
  36 #define PM800_CHG_INT_STS1                      (1 << 2)
  37 #define PM800_BAT_INT_STS1                      (1 << 3)
  38 #define PM800_RTC_INT_STS1                      (1 << 4)
  39 #define PM800_CLASSD_OC_INT_STS1        (1 << 5)
  40
  41 #define PM800_INT_STATUS2               (0x06)
  42 #define PM800_VBAT_INT_STS2             (1 << 0)
  43 #define PM800_VSYS_INT_STS2             (1 << 1)
  44 #define PM800_VCHG_INT_STS2             (1 << 2)
  45 #define PM800_TINT_INT_STS2             (1 << 3)
  46 #define PM800_GPADC0_INT_STS2   (1 << 4)
  47 #define PM800_TBAT_INT_STS2             (1 << 5)
  48 #define PM800_GPADC2_INT_STS2   (1 << 6)
  49 #define PM800_GPADC3_INT_STS2   (1 << 7)
  50
  51 #define PM800_INT_STATUS3               (0x07)
  52
  53 #define PM800_INT_STATUS4               (0x08)
  54 #define PM800_GPIO0_INT_STS4            (1 << 0)
  55 #define PM800_GPIO1_INT_STS4            (1 << 1)
  56 #define PM800_GPIO2_INT_STS4            (1 << 2)
  57 #define PM800_GPIO3_INT_STS4            (1 << 3)
  58 #define PM800_GPIO4_INT_STS4            (1 << 4)
  59
  60 #define PM800_INT_ENA_1         (0x09)
  61 #define PM800_ONKEY_INT_ENA1            (1 << 0)
  62 #define PM800_EXTON_INT_ENA1            (1 << 1)
  63 #define PM800_CHG_INT_ENA1                      (1 << 2)
  64 #define PM800_BAT_INT_ENA1                      (1 << 3)
  65 #define PM800_RTC_INT_ENA1                      (1 << 4)
  66 #define PM800_CLASSD_OC_INT_ENA1        (1 << 5)
  67
  68 #define PM800_INT_ENA_2         (0x0A)
  69 #define PM800_VBAT_INT_ENA2             (1 << 0)
  70 #define PM800_VSYS_INT_ENA2             (1 << 1)
  71 #define PM800_VCHG_INT_ENA2             (1 << 2)
  72 #define PM800_TINT_INT_ENA2             (1 << 3)
  73
  74 #define PM800_INT_ENA_3         (0x0B)
  75 #define PM800_GPADC0_INT_ENA3           (1 << 0)
  76 #define PM800_GPADC1_INT_ENA3           (1 << 1)
  77 #define PM800_GPADC2_INT_ENA3           (1 << 2)
  78 #define PM800_GPADC3_INT_ENA3           (1 << 3)
  79 #define PM800_GPADC4_INT_ENA3           (1 << 4)
  80
  81 #define PM800_INT_ENA_4         (0x0C)
  82 #define PM800_GPIO0_INT_ENA4            (1 << 0)
  83 #define PM800_GPIO1_INT_ENA4            (1 << 1)
  84 #define PM800_GPIO2_INT_ENA4            (1 << 2)
  85 #define PM800_GPIO3_INT_ENA4            (1 << 3)
  86 #define PM800_GPIO4_INT_ENA4            (1 << 4)
  87
  88 /* number of INT_ENA & INT_STATUS regs */
  89 #define PM800_INT_REG_NUM                       (4)
  90
  91 /* Interrupt Number in 88PM800 */
  92 enum {
  93         PM800_IRQ_ONKEY,        /*EN1b0 *//*0 */
  94         PM800_IRQ_EXTON,        /*EN1b1 */
  95         PM800_IRQ_CHG,          /*EN1b2 */
  96         PM800_IRQ_BAT,          /*EN1b3 */
  97         PM800_IRQ_RTC,          /*EN1b4 */
  98         PM800_IRQ_CLASSD,       /*EN1b5 *//*5 */
  99         PM800_IRQ_VBAT,         /*EN2b0 */
 100         PM800_IRQ_VSYS,         /*EN2b1 */
 101         PM800_IRQ_VCHG,         /*EN2b2 */
 102         PM800_IRQ_TINT,         /*EN2b3 */
 103         PM800_IRQ_GPADC0,       /*EN3b0 *//*10 */
 104         PM800_IRQ_GPADC1,       /*EN3b1 */
 105         PM800_IRQ_GPADC2,       /*EN3b2 */
 106         PM800_IRQ_GPADC3,       /*EN3b3 */
 107         PM800_IRQ_GPADC4,       /*EN3b4 */
 108         PM800_IRQ_GPIO0,        /*EN4b0 *//*15 */
 109         PM800_IRQ_GPIO1,        /*EN4b1 */
 110         PM800_IRQ_GPIO2,        /*EN4b2 */
 111         PM800_IRQ_GPIO3,        /*EN4b3 */
 112         PM800_IRQ_GPIO4,        /*EN4b4 *//*19 */
 113         PM800_MAX_IRQ,
 114 };
 115
 116 enum {
 117         /* Procida */
 118         PM800_CHIP_A0  = 0x60,
 119         PM800_CHIP_A1  = 0x61,
 120         PM800_CHIP_B0  = 0x62,
 121         PM800_CHIP_C0  = 0x63,
 122         PM800_CHIP_END = PM800_CHIP_C0,
 123
 124         /* Make sure to update this to the last stepping */
 125         PM8XXX_CHIP_END = PM800_CHIP_END
 126 };
 127
 128 static const struct i2c_device_id pm80x_id_table[] = {
 129         {"88PM800", CHIP_PM800},
 130         {} /* NULL terminated */
 131 };
 132 MODULE_DEVICE_TABLE(i2c, pm80x_id_table);
 133
 134 static struct resource rtc_resources[] = {
 135         {
 136          .name = "88pm80x-rtc",
 137          .start = PM800_IRQ_RTC,
 138          .end = PM800_IRQ_RTC,
 139          .flags = IORESOURCE_IRQ,
 140          },
 141 };
 142
 143 static struct mfd_cell rtc_devs[] = {
 144         {
 145          .name = "88pm80x-rtc",
 146          .num_resources = ARRAY_SIZE(rtc_resources),
 147          .resources = &rtc_resources[0],
 148          .id = -1,
 149          },
 150 };
 151
 152 static struct resource onkey_resources[] = {
 153         {
 154          .name = "88pm80x-onkey",
 155          .start = PM800_IRQ_ONKEY,
 156          .end = PM800_IRQ_ONKEY,
 157          .flags = IORESOURCE_IRQ,
 158          },
 159 };
 160
 161 static struct mfd_cell onkey_devs[] = {
 162         {
 163          .name = "88pm80x-onkey",
 164          .num_resources = 1,
 165          .resources = &onkey_resources[0],
 166          .id = -1,
 167          },
 168 };
 169
 170 static const struct regmap_irq pm800_irqs[] = {
 171         /* INT0 */
 172         [PM800_IRQ_ONKEY] = {
 173                 .mask = PM800_ONKEY_INT_ENA1,
 174         },
 175         [PM800_IRQ_EXTON] = {
 176                 .mask = PM800_EXTON_INT_ENA1,
 177         },
 178         [PM800_IRQ_CHG] = {
 179                 .mask = PM800_CHG_INT_ENA1,
 180         },
 181         [PM800_IRQ_BAT] = {
 182                 .mask = PM800_BAT_INT_ENA1,
 183         },
 184         [PM800_IRQ_RTC] = {
 185                 .mask = PM800_RTC_INT_ENA1,
 186         },
 187         [PM800_IRQ_CLASSD] = {
 188                 .mask = PM800_CLASSD_OC_INT_ENA1,
 189         },
 190         /* INT1 */
 191         [PM800_IRQ_VBAT] = {
 192                 .reg_offset = 1,
 193                 .mask = PM800_VBAT_INT_ENA2,
 194         },
 195         [PM800_IRQ_VSYS] = {
 196                 .reg_offset = 1,
 197                 .mask = PM800_VSYS_INT_ENA2,
 198         },
 199         [PM800_IRQ_VCHG] = {
 200                 .reg_offset = 1,
 201                 .mask = PM800_VCHG_INT_ENA2,
 202         },
 203         [PM800_IRQ_TINT] = {
 204                 .reg_offset = 1,
 205                 .mask = PM800_TINT_INT_ENA2,
 206         },
 207         /* INT2 */
 208         [PM800_IRQ_GPADC0] = {
 209                 .reg_offset = 2,
 210                 .mask = PM800_GPADC0_INT_ENA3,
 211         },
 212         [PM800_IRQ_GPADC1] = {
 213                 .reg_offset = 2,
 214                 .mask = PM800_GPADC1_INT_ENA3,
 215         },
 216         [PM800_IRQ_GPADC2] = {
 217                 .reg_offset = 2,
 218                 .mask = PM800_GPADC2_INT_ENA3,
 219         },
 220         [PM800_IRQ_GPADC3] = {
 221                 .reg_offset = 2,
 222                 .mask = PM800_GPADC3_INT_ENA3,
 223         },
 224         [PM800_IRQ_GPADC4] = {
 225                 .reg_offset = 2,
 226                 .mask = PM800_GPADC4_INT_ENA3,
 227         },
 228         /* INT3 */
 229         [PM800_IRQ_GPIO0] = {
 230                 .reg_offset = 3,
 231                 .mask = PM800_GPIO0_INT_ENA4,
 232         },
 233         [PM800_IRQ_GPIO1] = {
 234                 .reg_offset = 3,
 235                 .mask = PM800_GPIO1_INT_ENA4,
 236         },
 237         [PM800_IRQ_GPIO2] = {
 238                 .reg_offset = 3,
 239                 .mask = PM800_GPIO2_INT_ENA4,
 240         },
 241         [PM800_IRQ_GPIO3] = {
 242                 .reg_offset = 3,
 243                 .mask = PM800_GPIO3_INT_ENA4,
 244         },
 245         [PM800_IRQ_GPIO4] = {
 246                 .reg_offset = 3,
 247                 .mask = PM800_GPIO4_INT_ENA4,
 248         },
 249 };
 250
 251 static int __devinit device_gpadc_init(struct pm80x_chip *chip,
 252                                        struct pm80x_platform_data *pdata)
 253 {
 254         struct pm80x_subchip *subchip = chip->subchip;
 255         struct regmap *map = subchip->regmap_gpadc;
 256         int data = 0, mask = 0, ret = 0;
 257
 258         if (!map) {
 259                 dev_warn(chip->dev,
 260                          "Warning: gpadc regmap is not available!\n");
 261                 return -EINVAL;
 262         }
 263         /*
 264          * initialize GPADC without activating it turn on GPADC
 265          * measurments
 266          */
 267         ret = regmap_update_bits(map,
 268                                  PM800_GPADC_MISC_CONFIG2,
 269                                  PM800_GPADC_MISC_GPFSM_EN,
 270                                  PM800_GPADC_MISC_GPFSM_EN);
 271         if (ret < 0)
 272                 goto out;
 273         /*
 274          * This function configures the ADC as requires for
 275          * CP implementation.CP does not "own" the ADC configuration
 276          * registers and relies on AP.
 277          * Reason: enable automatic ADC measurements needed
 278          * for CP to get VBAT and RF temperature readings.
 279          */
 280         ret = regmap_update_bits(map, PM800_GPADC_MEAS_EN1,
 281                                  PM800_MEAS_EN1_VBAT, PM800_MEAS_EN1_VBAT);
 282         if (ret < 0)
 283                 goto out;
 284         ret = regmap_update_bits(map, PM800_GPADC_MEAS_EN2,
 285                                  (PM800_MEAS_EN2_RFTMP | PM800_MEAS_GP0_EN),
 286                                  (PM800_MEAS_EN2_RFTMP | PM800_MEAS_GP0_EN));
 287         if (ret < 0)
 288                 goto out;
 289
 290         /*
 291          * the defult of PM800 is GPADC operates at 100Ks/s rate
 292          * and Number of GPADC slots with active current bias prior
 293          * to GPADC sampling = 1 slot for all GPADCs set for
 294          * Temprature mesurmants
 295          */
 296         mask = (PM800_GPADC_GP_BIAS_EN0 | PM800_GPADC_GP_BIAS_EN1 |
 297                 PM800_GPADC_GP_BIAS_EN2 | PM800_GPADC_GP_BIAS_EN3);
 298
 299         if (pdata && (pdata->batt_det == 0))
 300                 data = (PM800_GPADC_GP_BIAS_EN0 | PM800_GPADC_GP_BIAS_EN1 |
 301                         PM800_GPADC_GP_BIAS_EN2 | PM800_GPADC_GP_BIAS_EN3);
 302         else
 303                 data = (PM800_GPADC_GP_BIAS_EN0 | PM800_GPADC_GP_BIAS_EN2 |
 304                         PM800_GPADC_GP_BIAS_EN3);
 305
 306         ret = regmap_update_bits(map, PM800_GP_BIAS_ENA1, mask, data);
 307         if (ret < 0)
 308                 goto out;
 309
 310         dev_info(chip->dev, "pm800 device_gpadc_init: Done\n");
 311         return 0;
 312
 313 out:
 314         dev_info(chip->dev, "pm800 device_gpadc_init: Failed!\n");
 315         return ret;
 316 }
 317
 318 static int __devinit device_irq_init_800(struct pm80x_chip *chip)
 319 {
 320         struct regmap *map = chip->regmap;
 321         unsigned long flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
 322         int data, mask, ret = -EINVAL;
 323
 324         if (!map || !chip->irq) {
 325                 dev_err(chip->dev, "incorrect parameters\n");
 326                 return -EINVAL;
 327         }
 328
 329         /*
 330          * irq_mode defines the way of clearing interrupt. it's read-clear by
 331          * default.
 332          */
 333         mask =
 334             PM800_WAKEUP2_INV_INT | PM800_WAKEUP2_INT_CLEAR |
 335             PM800_WAKEUP2_INT_MASK;
 336
 337         data = PM800_WAKEUP2_INT_CLEAR;
 338         ret = regmap_update_bits(map, PM800_WAKEUP2, mask, data);
 339
 340         if (ret < 0)
 341                 goto out;
 342
 343         ret =
 344             regmap_add_irq_chip(chip->regmap, chip->irq, flags, -1,
 345                                 chip->regmap_irq_chip, &chip->irq_data);
 346
 347 out:
 348         return ret;
 349 }
 350
 351 static void device_irq_exit_800(struct pm80x_chip *chip)
 352 {
 353         regmap_del_irq_chip(chip->irq, chip->irq_data);
 354 }
 355
 356 static struct regmap_irq_chip pm800_irq_chip = {
 357         .name = "88pm800",
 358         .irqs = pm800_irqs,
 359         .num_irqs = ARRAY_SIZE(pm800_irqs),
 360
 361         .num_regs = 4,
 362         .status_base = PM800_INT_STATUS1,
 363         .mask_base = PM800_INT_ENA_1,
 364         .ack_base = PM800_INT_STATUS1,
 365 };
 366
 367 static int pm800_pages_init(struct pm80x_chip *chip)
 368 {
 369         struct pm80x_subchip *subchip;
 370         struct i2c_client *client = chip->client;
 371
 372         subchip = chip->subchip;
 373         /* PM800 block power: i2c addr 0x31 */
 374         if (subchip->power_page_addr) {
 375                 subchip->power_page =
 376                     i2c_new_dummy(client->adapter, subchip->power_page_addr);
 377                 subchip->regmap_power =
 378                     devm_regmap_init_i2c(subchip->power_page,
 379                                          &pm80x_regmap_config);
 380                 i2c_set_clientdata(subchip->power_page, chip);
 381         } else
 382                 dev_info(chip->dev,
 383                          "PM800 block power 0x31: No power_page_addr\n");
 384
 385         /* PM800 block GPADC: i2c addr 0x32 */
 386         if (subchip->gpadc_page_addr) {
 387                 subchip->gpadc_page = i2c_new_dummy(client->adapter,
 388                                                     subchip->gpadc_page_addr);
 389                 subchip->regmap_gpadc =
 390                     devm_regmap_init_i2c(subchip->gpadc_page,
 391                                          &pm80x_regmap_config);
 392                 i2c_set_clientdata(subchip->gpadc_page, chip);
 393         } else
 394                 dev_info(chip->dev,
 395                          "PM800 block GPADC 0x32: No gpadc_page_addr\n");
 396
 397         return 0;
 398 }
 399
 400 static void pm800_pages_exit(struct pm80x_chip *chip)
 401 {
 402         struct pm80x_subchip *subchip;
 403
 404         regmap_exit(chip->regmap);
 405         i2c_unregister_device(chip->client);
 406
 407         subchip = chip->subchip;
 408         if (subchip->power_page) {
 409                 regmap_exit(subchip->regmap_power);
 410                 i2c_unregister_device(subchip->power_page);
 411         }
 412         if (subchip->gpadc_page) {
 413                 regmap_exit(subchip->regmap_gpadc);
 414                 i2c_unregister_device(subchip->gpadc_page);
 415         }
 416 }
 417
 418 static int __devinit device_800_init(struct pm80x_chip *chip,
 419                                      struct pm80x_platform_data *pdata)
 420 {
 421         int ret, pmic_id;
 422         unsigned int val;
 423
 424         ret = regmap_read(chip->regmap, PM800_CHIP_ID, &val);
 425         if (ret < 0) {
 426                 dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
 427                 goto out;
 428         }
 429
 430         pmic_id = val & PM80X_VERSION_MASK;
 431
 432         if ((pmic_id >= PM800_CHIP_A0) && (pmic_id <= PM800_CHIP_END)) {
 433                 chip->version = val;
 434                 dev_info(chip->dev,
 435                          "88PM80x:Marvell 88PM800 (ID:0x%x) detected\n", val);
 436         } else {
 437                 dev_err(chip->dev,
 438                         "Failed to detect Marvell 88PM800:ChipID[0x%x]\n", val);
 439                 ret = -EINVAL;
 440                 goto out;
 441         }
 442
 443         /*
 444          * alarm wake up bit will be clear in device_irq_init(),
 445          * read before that
 446          */
 447         ret = regmap_read(chip->regmap, PM800_RTC_CONTROL, &val);
 448         if (ret < 0) {
 449                 dev_err(chip->dev, "Failed to read RTC register: %d\n", ret);
 450                 goto out;
 451         }
 452         if (val & PM800_ALARM_WAKEUP) {
 453                 if (pdata && pdata->rtc)
 454                         pdata->rtc->rtc_wakeup = 1;
 455         }
 456
 457         ret = device_gpadc_init(chip, pdata);
 458         if (ret < 0) {
 459                 dev_err(chip->dev, "[%s]Failed to init gpadc\n", __func__);
 460                 goto out;
 461         }
 462
 463         chip->regmap_irq_chip = &pm800_irq_chip;
 464
 465         ret = device_irq_init_800(chip);
 466         if (ret < 0) {
 467                 dev_err(chip->dev, "[%s]Failed to init pm800 irq\n", __func__);
 468                 goto out;
 469         }
 470
 471         ret =
 472             mfd_add_devices(chip->dev, 0, &onkey_devs[0],
 473                             ARRAY_SIZE(onkey_devs), &onkey_resources[0], 0);
 474         if (ret < 0) {
 475                 dev_err(chip->dev, "Failed to add onkey subdev\n");
 476                 goto out_dev;
 477         } else
 478                 dev_info(chip->dev, "[%s]:Added mfd onkey_devs\n", __func__);
 479
 480         if (pdata && pdata->rtc) {
 481                 rtc_devs[0].platform_data = pdata->rtc;
 482                 rtc_devs[0].pdata_size = sizeof(struct pm80x_rtc_pdata);
 483                 ret = mfd_add_devices(chip->dev, 0, &rtc_devs[0],
 484                                       ARRAY_SIZE(rtc_devs), NULL, 0);
 485                 if (ret < 0) {
 486                         dev_err(chip->dev, "Failed to add rtc subdev\n");
 487                         goto out_dev;
 488                 } else
 489                         dev_info(chip->dev,
 490                                  "[%s]:Added mfd rtc_devs\n", __func__);
 491         }
 492
 493         return 0;
 494 out_dev:
 495         mfd_remove_devices(chip->dev);
 496         device_irq_exit_800(chip);
 497 out:
 498         return ret;
 499 }
 500
 501 static int __devinit pm800_probe(struct i2c_client *client,
 502                                  const struct i2c_device_id *id)
 503 {
 504         int ret = 0;
 505         struct pm80x_chip *chip;
 506         struct pm80x_platform_data *pdata = client->dev.platform_data;
 507         struct pm80x_subchip *subchip;
 508
 509         ret = pm80x_init(client, id);
 510         if (ret) {
 511                 dev_err(&client->dev, "pm800_init fail\n");
 512                 goto out_init;
 513         }
 514
 515         chip = i2c_get_clientdata(client);
 516
 517         /* init subchip for PM800 */
 518         subchip =
 519             devm_kzalloc(&client->dev, sizeof(struct pm80x_subchip),
 520                          GFP_KERNEL);
 521         if (!subchip) {
 522                 ret = -ENOMEM;
 523                 goto err_subchip_alloc;
 524         }
 525
 526         subchip->power_page_addr = pdata->power_page_addr;
 527         subchip->gpadc_page_addr = pdata->gpadc_page_addr;
 528         chip->subchip = subchip;
 529
 530         ret = device_800_init(chip, pdata);
 531         if (ret) {
 532                 dev_err(chip->dev, "%s id 0x%x failed!\n", __func__, chip->id);
 533                 goto err_800_init;
 534         }
 535
 536         ret = pm800_pages_init(chip);
 537         if (ret) {
 538                 dev_err(&client->dev, "pm800_pages_init failed!\n");
 539                 goto err_page_init;
 540         }
 541
 542         if (pdata->plat_config)
 543                 pdata->plat_config(chip, pdata);
 544
 545 err_page_init:
 546         mfd_remove_devices(chip->dev);
 547         device_irq_exit_800(chip);
 548 err_800_init:
 549         devm_kfree(&client->dev, subchip);
 550 err_subchip_alloc:
 551         pm80x_deinit(client);
 552 out_init:
 553         return ret;
 554 }
 555
 556 static int __devexit pm800_remove(struct i2c_client *client)
 557 {
 558         struct pm80x_chip *chip = i2c_get_clientdata(client);
 559
 560         mfd_remove_devices(chip->dev);
 561         device_irq_exit_800(chip);
 562
 563         pm800_pages_exit(chip);
 564         devm_kfree(&client->dev, chip->subchip);
 565
 566         pm80x_deinit(client);
 567
 568         return 0;
 569 }
 570
 571 static struct i2c_driver pm800_driver = {
 572         .driver = {
 573                 .name = "88PM80X",
 574                 .owner = THIS_MODULE,
 575                 .pm = &pm80x_pm_ops,
 576                 },
 577         .probe = pm800_probe,
 578         .remove = __devexit_p(pm800_remove),
 579         .id_table = pm80x_id_table,
 580 };
 581
 582 static int __init pm800_i2c_init(void)
 583 {
 584         return i2c_add_driver(&pm800_driver);
 585 }
 586 subsys_initcall(pm800_i2c_init);
 587
 588 static void __exit pm800_i2c_exit(void)
 589 {
 590         i2c_del_driver(&pm800_driver);
 591 }
 592 module_exit(pm800_i2c_exit);
 593
 594 MODULE_DESCRIPTION("PMIC Driver for Marvell 88PM800");
 595 MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
 596 MODULE_LICENSE("GPL");