drivers/mfd/palmas.c

   1 /*
   2  * TI Palmas MFD Driver
   3  *
   4  * Copyright 2011-2012 Texas Instruments Inc.
   5  *
   6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
   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
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/i2c.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/irq.h>
  22 #include <linux/regmap.h>
  23 #include <linux/err.h>
  24 #include <linux/mfd/core.h>
  25 #include <linux/mfd/palmas.h>
  26 #include <linux/of_platform.h>
  27
  28 enum palmas_ids {
  29         PALMAS_PMIC_ID,
  30         PALMAS_GPIO_ID,
  31         PALMAS_LEDS_ID,
  32         PALMAS_WDT_ID,
  33         PALMAS_RTC_ID,
  34         PALMAS_PWRBUTTON_ID,
  35         PALMAS_GPADC_ID,
  36         PALMAS_RESOURCE_ID,
  37         PALMAS_CLK_ID,
  38         PALMAS_PWM_ID,
  39         PALMAS_USB_ID,
  40 };
  41
  42 static struct resource palmas_rtc_resources[] = {
  43         {
  44                 .start  = PALMAS_RTC_ALARM_IRQ,
  45                 .end    = PALMAS_RTC_ALARM_IRQ,
  46                 .flags  = IORESOURCE_IRQ,
  47         },
  48 };
  49
  50 static const struct mfd_cell palmas_children[] = {
  51         {
  52                 .name = "palmas-pmic",
  53                 .id = PALMAS_PMIC_ID,
  54         },
  55         {
  56                 .name = "palmas-gpio",
  57                 .id = PALMAS_GPIO_ID,
  58         },
  59         {
  60                 .name = "palmas-leds",
  61                 .id = PALMAS_LEDS_ID,
  62         },
  63         {
  64                 .name = "palmas-wdt",
  65                 .id = PALMAS_WDT_ID,
  66         },
  67         {
  68                 .name = "palmas-rtc",
  69                 .id = PALMAS_RTC_ID,
  70                 .resources = &palmas_rtc_resources[0],
  71                 .num_resources = ARRAY_SIZE(palmas_rtc_resources),
  72         },
  73         {
  74                 .name = "palmas-pwrbutton",
  75                 .id = PALMAS_PWRBUTTON_ID,
  76         },
  77         {
  78                 .name = "palmas-gpadc",
  79                 .id = PALMAS_GPADC_ID,
  80         },
  81         {
  82                 .name = "palmas-resource",
  83                 .id = PALMAS_RESOURCE_ID,
  84         },
  85         {
  86                 .name = "palmas-clk",
  87                 .id = PALMAS_CLK_ID,
  88         },
  89         {
  90                 .name = "palmas-pwm",
  91                 .id = PALMAS_PWM_ID,
  92         },
  93         {
  94                 .name = "palmas-usb",
  95                 .id = PALMAS_USB_ID,
  96         }
  97 };
  98
  99 static const struct regmap_config palmas_regmap_config[PALMAS_NUM_CLIENTS] = {
 100         {
 101                 .reg_bits = 8,
 102                 .val_bits = 8,
 103                 .max_register = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
 104                                         PALMAS_PRIMARY_SECONDARY_PAD3),
 105         },
 106         {
 107                 .reg_bits = 8,
 108                 .val_bits = 8,
 109                 .max_register = PALMAS_BASE_TO_REG(PALMAS_GPADC_BASE,
 110                                         PALMAS_GPADC_SMPS_VSEL_MONITORING),
 111         },
 112         {
 113                 .reg_bits = 8,
 114                 .val_bits = 8,
 115                 .max_register = PALMAS_BASE_TO_REG(PALMAS_TRIM_GPADC_BASE,
 116                                         PALMAS_GPADC_TRIM16),
 117         },
 118 };
 119
 120 static const struct regmap_irq palmas_irqs[] = {
 121         /* INT1 IRQs */
 122         [PALMAS_CHARG_DET_N_VBUS_OVV_IRQ] = {
 123                 .mask = PALMAS_INT1_STATUS_CHARG_DET_N_VBUS_OVV,
 124         },
 125         [PALMAS_PWRON_IRQ] = {
 126                 .mask = PALMAS_INT1_STATUS_PWRON,
 127         },
 128         [PALMAS_LONG_PRESS_KEY_IRQ] = {
 129                 .mask = PALMAS_INT1_STATUS_LONG_PRESS_KEY,
 130         },
 131         [PALMAS_RPWRON_IRQ] = {
 132                 .mask = PALMAS_INT1_STATUS_RPWRON,
 133         },
 134         [PALMAS_PWRDOWN_IRQ] = {
 135                 .mask = PALMAS_INT1_STATUS_PWRDOWN,
 136         },
 137         [PALMAS_HOTDIE_IRQ] = {
 138                 .mask = PALMAS_INT1_STATUS_HOTDIE,
 139         },
 140         [PALMAS_VSYS_MON_IRQ] = {
 141                 .mask = PALMAS_INT1_STATUS_VSYS_MON,
 142         },
 143         [PALMAS_VBAT_MON_IRQ] = {
 144                 .mask = PALMAS_INT1_STATUS_VBAT_MON,
 145         },
 146         /* INT2 IRQs*/
 147         [PALMAS_RTC_ALARM_IRQ] = {
 148                 .mask = PALMAS_INT2_STATUS_RTC_ALARM,
 149                 .reg_offset = 1,
 150         },
 151         [PALMAS_RTC_TIMER_IRQ] = {
 152                 .mask = PALMAS_INT2_STATUS_RTC_TIMER,
 153                 .reg_offset = 1,
 154         },
 155         [PALMAS_WDT_IRQ] = {
 156                 .mask = PALMAS_INT2_STATUS_WDT,
 157                 .reg_offset = 1,
 158         },
 159         [PALMAS_BATREMOVAL_IRQ] = {
 160                 .mask = PALMAS_INT2_STATUS_BATREMOVAL,
 161                 .reg_offset = 1,
 162         },
 163         [PALMAS_RESET_IN_IRQ] = {
 164                 .mask = PALMAS_INT2_STATUS_RESET_IN,
 165                 .reg_offset = 1,
 166         },
 167         [PALMAS_FBI_BB_IRQ] = {
 168                 .mask = PALMAS_INT2_STATUS_FBI_BB,
 169                 .reg_offset = 1,
 170         },
 171         [PALMAS_SHORT_IRQ] = {
 172                 .mask = PALMAS_INT2_STATUS_SHORT,
 173                 .reg_offset = 1,
 174         },
 175         [PALMAS_VAC_ACOK_IRQ] = {
 176                 .mask = PALMAS_INT2_STATUS_VAC_ACOK,
 177                 .reg_offset = 1,
 178         },
 179         /* INT3 IRQs */
 180         [PALMAS_GPADC_AUTO_0_IRQ] = {
 181                 .mask = PALMAS_INT3_STATUS_GPADC_AUTO_0,
 182                 .reg_offset = 2,
 183         },
 184         [PALMAS_GPADC_AUTO_1_IRQ] = {
 185                 .mask = PALMAS_INT3_STATUS_GPADC_AUTO_1,
 186                 .reg_offset = 2,
 187         },
 188         [PALMAS_GPADC_EOC_SW_IRQ] = {
 189                 .mask = PALMAS_INT3_STATUS_GPADC_EOC_SW,
 190                 .reg_offset = 2,
 191         },
 192         [PALMAS_GPADC_EOC_RT_IRQ] = {
 193                 .mask = PALMAS_INT3_STATUS_GPADC_EOC_RT,
 194                 .reg_offset = 2,
 195         },
 196         [PALMAS_ID_OTG_IRQ] = {
 197                 .mask = PALMAS_INT3_STATUS_ID_OTG,
 198                 .reg_offset = 2,
 199         },
 200         [PALMAS_ID_IRQ] = {
 201                 .mask = PALMAS_INT3_STATUS_ID,
 202                 .reg_offset = 2,
 203         },
 204         [PALMAS_VBUS_OTG_IRQ] = {
 205                 .mask = PALMAS_INT3_STATUS_VBUS_OTG,
 206                 .reg_offset = 2,
 207         },
 208         [PALMAS_VBUS_IRQ] = {
 209                 .mask = PALMAS_INT3_STATUS_VBUS,
 210                 .reg_offset = 2,
 211         },
 212         /* INT4 IRQs */
 213         [PALMAS_GPIO_0_IRQ] = {
 214                 .mask = PALMAS_INT4_STATUS_GPIO_0,
 215                 .reg_offset = 3,
 216         },
 217         [PALMAS_GPIO_1_IRQ] = {
 218                 .mask = PALMAS_INT4_STATUS_GPIO_1,
 219                 .reg_offset = 3,
 220         },
 221         [PALMAS_GPIO_2_IRQ] = {
 222                 .mask = PALMAS_INT4_STATUS_GPIO_2,
 223                 .reg_offset = 3,
 224         },
 225         [PALMAS_GPIO_3_IRQ] = {
 226                 .mask = PALMAS_INT4_STATUS_GPIO_3,
 227                 .reg_offset = 3,
 228         },
 229         [PALMAS_GPIO_4_IRQ] = {
 230                 .mask = PALMAS_INT4_STATUS_GPIO_4,
 231                 .reg_offset = 3,
 232         },
 233         [PALMAS_GPIO_5_IRQ] = {
 234                 .mask = PALMAS_INT4_STATUS_GPIO_5,
 235                 .reg_offset = 3,
 236         },
 237         [PALMAS_GPIO_6_IRQ] = {
 238                 .mask = PALMAS_INT4_STATUS_GPIO_6,
 239                 .reg_offset = 3,
 240         },
 241         [PALMAS_GPIO_7_IRQ] = {
 242                 .mask = PALMAS_INT4_STATUS_GPIO_7,
 243                 .reg_offset = 3,
 244         },
 245 };
 246
 247 static struct regmap_irq_chip palmas_irq_chip = {
 248         .name = "palmas",
 249         .irqs = palmas_irqs,
 250         .num_irqs = ARRAY_SIZE(palmas_irqs),
 251
 252         .num_regs = 4,
 253         .irq_reg_stride = 5,
 254         .status_base = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE,
 255                         PALMAS_INT1_STATUS),
 256         .mask_base = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE,
 257                         PALMAS_INT1_MASK),
 258 };
 259
 260 static int palmas_set_pdata_irq_flag(struct i2c_client *i2c,
 261                 struct palmas_platform_data *pdata)
 262 {
 263         struct irq_data *irq_data = irq_get_irq_data(i2c->irq);
 264         if (!irq_data) {
 265                 dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
 266                 return -EINVAL;
 267         }
 268
 269         pdata->irq_flags = irqd_get_trigger_type(irq_data);
 270         dev_info(&i2c->dev, "Irq flag is 0x%08x\n", pdata->irq_flags);
 271         return 0;
 272 }
 273
 274 static void palmas_dt_to_pdata(struct i2c_client *i2c,
 275                 struct palmas_platform_data *pdata)
 276 {
 277         struct device_node *node = i2c->dev.of_node;
 278         int ret;
 279         u32 prop;
 280
 281         ret = of_property_read_u32(node, "ti,mux-pad1", &prop);
 282         if (!ret) {
 283                 pdata->mux_from_pdata = 1;
 284                 pdata->pad1 = prop;
 285         }
 286
 287         ret = of_property_read_u32(node, "ti,mux-pad2", &prop);
 288         if (!ret) {
 289                 pdata->mux_from_pdata = 1;
 290                 pdata->pad2 = prop;
 291         }
 292
 293         /* The default for this register is all masked */
 294         ret = of_property_read_u32(node, "ti,power-ctrl", &prop);
 295         if (!ret)
 296                 pdata->power_ctrl = prop;
 297         else
 298                 pdata->power_ctrl = PALMAS_POWER_CTRL_NSLEEP_MASK |
 299                                         PALMAS_POWER_CTRL_ENABLE1_MASK |
 300                                         PALMAS_POWER_CTRL_ENABLE2_MASK;
 301         if (i2c->irq)
 302                 palmas_set_pdata_irq_flag(i2c, pdata);
 303 }
 304
 305 static int palmas_i2c_probe(struct i2c_client *i2c,
 306                             const struct i2c_device_id *id)
 307 {
 308         struct palmas *palmas;
 309         struct palmas_platform_data *pdata;
 310         struct device_node *node = i2c->dev.of_node;
 311         int ret = 0, i;
 312         unsigned int reg, addr;
 313         int slave;
 314         struct mfd_cell *children;
 315
 316         pdata = dev_get_platdata(&i2c->dev);
 317
 318         if (node && !pdata) {
 319                 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
 320
 321                 if (!pdata)
 322                         return -ENOMEM;
 323
 324                 palmas_dt_to_pdata(i2c, pdata);
 325         }
 326
 327         if (!pdata)
 328                 return -EINVAL;
 329
 330         palmas = devm_kzalloc(&i2c->dev, sizeof(struct palmas), GFP_KERNEL);
 331         if (palmas == NULL)
 332                 return -ENOMEM;
 333
 334         i2c_set_clientdata(i2c, palmas);
 335         palmas->dev = &i2c->dev;
 336         palmas->id = id->driver_data;
 337         palmas->irq = i2c->irq;
 338
 339         for (i = 0; i < PALMAS_NUM_CLIENTS; i++) {
 340                 if (i == 0)
 341                         palmas->i2c_clients[i] = i2c;
 342                 else {
 343                         palmas->i2c_clients[i] =
 344                                         i2c_new_dummy(i2c->adapter,
 345                                                         i2c->addr + i);
 346                         if (!palmas->i2c_clients[i]) {
 347                                 dev_err(palmas->dev,
 348                                         "can't attach client %d\n", i);
 349                                 ret = -ENOMEM;
 350                                 goto err;
 351                         }
 352                         palmas->i2c_clients[i]->dev.of_node = of_node_get(node);
 353                 }
 354                 palmas->regmap[i] = devm_regmap_init_i2c(palmas->i2c_clients[i],
 355                                 &palmas_regmap_config[i]);
 356                 if (IS_ERR(palmas->regmap[i])) {
 357                         ret = PTR_ERR(palmas->regmap[i]);
 358                         dev_err(palmas->dev,
 359                                 "Failed to allocate regmap %d, err: %d\n",
 360                                 i, ret);
 361                         goto err;
 362                 }
 363         }
 364
 365         /* Change interrupt line output polarity */
 366         if (pdata->irq_flags & IRQ_TYPE_LEVEL_HIGH)
 367                 reg = PALMAS_POLARITY_CTRL_INT_POLARITY;
 368         else
 369                 reg = 0;
 370         ret = palmas_update_bits(palmas, PALMAS_PU_PD_OD_BASE,
 371                         PALMAS_POLARITY_CTRL, PALMAS_POLARITY_CTRL_INT_POLARITY,
 372                         reg);
 373         if (ret < 0) {
 374                 dev_err(palmas->dev, "POLARITY_CTRL updat failed: %d\n", ret);
 375                 goto err;
 376         }
 377
 378         /* Change IRQ into clear on read mode for efficiency */
 379         slave = PALMAS_BASE_TO_SLAVE(PALMAS_INTERRUPT_BASE);
 380         addr = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE, PALMAS_INT_CTRL);
 381         reg = PALMAS_INT_CTRL_INT_CLEAR;
 382
 383         regmap_write(palmas->regmap[slave], addr, reg);
 384
 385         ret = regmap_add_irq_chip(palmas->regmap[slave], palmas->irq,
 386                         IRQF_ONESHOT | pdata->irq_flags, 0, &palmas_irq_chip,
 387                         &palmas->irq_data);
 388         if (ret < 0)
 389                 goto err;
 390
 391         slave = PALMAS_BASE_TO_SLAVE(PALMAS_PU_PD_OD_BASE);
 392         addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
 393                         PALMAS_PRIMARY_SECONDARY_PAD1);
 394
 395         if (pdata->mux_from_pdata) {
 396                 reg = pdata->pad1;
 397                 ret = regmap_write(palmas->regmap[slave], addr, reg);
 398                 if (ret)
 399                         goto err_irq;
 400         } else {
 401                 ret = regmap_read(palmas->regmap[slave], addr, &reg);
 402                 if (ret)
 403                         goto err_irq;
 404         }
 405
 406         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_0))
 407                 palmas->gpio_muxed |= PALMAS_GPIO_0_MUXED;
 408         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK))
 409                 palmas->gpio_muxed |= PALMAS_GPIO_1_MUXED;
 410         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK) ==
 411                         (2 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT))
 412                 palmas->led_muxed |= PALMAS_LED1_MUXED;
 413         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK) ==
 414                         (3 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT))
 415                 palmas->pwm_muxed |= PALMAS_PWM1_MUXED;
 416         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK))
 417                 palmas->gpio_muxed |= PALMAS_GPIO_2_MUXED;
 418         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK) ==
 419                         (2 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_SHIFT))
 420                 palmas->led_muxed |= PALMAS_LED2_MUXED;
 421         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK) ==
 422                         (3 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_SHIFT))
 423                 palmas->pwm_muxed |= PALMAS_PWM2_MUXED;
 424         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_3))
 425                 palmas->gpio_muxed |= PALMAS_GPIO_3_MUXED;
 426
 427         addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
 428                         PALMAS_PRIMARY_SECONDARY_PAD2);
 429
 430         if (pdata->mux_from_pdata) {
 431                 reg = pdata->pad2;
 432                 ret = regmap_write(palmas->regmap[slave], addr, reg);
 433                 if (ret)
 434                         goto err_irq;
 435         } else {
 436                 ret = regmap_read(palmas->regmap[slave], addr, &reg);
 437                 if (ret)
 438                         goto err_irq;
 439         }
 440
 441         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_4))
 442                 palmas->gpio_muxed |= PALMAS_GPIO_4_MUXED;
 443         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_5_MASK))
 444                 palmas->gpio_muxed |= PALMAS_GPIO_5_MUXED;
 445         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_6))
 446                 palmas->gpio_muxed |= PALMAS_GPIO_6_MUXED;
 447         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_7_MASK))
 448                 palmas->gpio_muxed |= PALMAS_GPIO_7_MUXED;
 449
 450         dev_info(palmas->dev, "Muxing GPIO %x, PWM %x, LED %x\n",
 451                         palmas->gpio_muxed, palmas->pwm_muxed,
 452                         palmas->led_muxed);
 453
 454         reg = pdata->power_ctrl;
 455
 456         slave = PALMAS_BASE_TO_SLAVE(PALMAS_PMU_CONTROL_BASE);
 457         addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_POWER_CTRL);
 458
 459         ret = regmap_write(palmas->regmap[slave], addr, reg);
 460         if (ret)
 461                 goto err_irq;
 462
 463         /*
 464          * If we are probing with DT do this the DT way and return here
 465          * otherwise continue and add devices using mfd helpers.
 466          */
 467         if (node) {
 468                 ret = of_platform_populate(node, NULL, NULL, &i2c->dev);
 469                 if (ret < 0)
 470                         goto err_irq;
 471                 else
 472                         return ret;
 473         }
 474
 475         children = kmemdup(palmas_children, sizeof(palmas_children),
 476                            GFP_KERNEL);
 477         if (!children) {
 478                 ret = -ENOMEM;
 479                 goto err_irq;
 480         }
 481
 482         children[PALMAS_PMIC_ID].platform_data = pdata->pmic_pdata;
 483         children[PALMAS_PMIC_ID].pdata_size = sizeof(*pdata->pmic_pdata);
 484
 485         children[PALMAS_GPADC_ID].platform_data = pdata->gpadc_pdata;
 486         children[PALMAS_GPADC_ID].pdata_size = sizeof(*pdata->gpadc_pdata);
 487
 488         children[PALMAS_RESOURCE_ID].platform_data = pdata->resource_pdata;
 489         children[PALMAS_RESOURCE_ID].pdata_size =
 490                         sizeof(*pdata->resource_pdata);
 491
 492         children[PALMAS_USB_ID].platform_data = pdata->usb_pdata;
 493         children[PALMAS_USB_ID].pdata_size = sizeof(*pdata->usb_pdata);
 494
 495         children[PALMAS_CLK_ID].platform_data = pdata->clk_pdata;
 496         children[PALMAS_CLK_ID].pdata_size = sizeof(*pdata->clk_pdata);
 497
 498         ret = mfd_add_devices(palmas->dev, -1,
 499                               children, ARRAY_SIZE(palmas_children),
 500                               NULL, 0,
 501                               regmap_irq_get_domain(palmas->irq_data));
 502         kfree(children);
 503
 504         if (ret < 0)
 505                 goto err_devices;
 506
 507         return ret;
 508
 509 err_devices:
 510         mfd_remove_devices(palmas->dev);
 511 err_irq:
 512         regmap_del_irq_chip(palmas->irq, palmas->irq_data);
 513 err:
 514         return ret;
 515 }
 516
 517 static int palmas_i2c_remove(struct i2c_client *i2c)
 518 {
 519         struct palmas *palmas = i2c_get_clientdata(i2c);
 520
 521         mfd_remove_devices(palmas->dev);
 522         regmap_del_irq_chip(palmas->irq, palmas->irq_data);
 523
 524         return 0;
 525 }
 526
 527 static const struct i2c_device_id palmas_i2c_id[] = {
 528         { "palmas", },
 529         { "twl6035", },
 530         { "twl6037", },
 531         { "tps65913", },
 532         { /* end */ }
 533 };
 534 MODULE_DEVICE_TABLE(i2c, palmas_i2c_id);
 535
 536 static struct of_device_id of_palmas_match_tbl[] = {
 537         { .compatible = "ti,palmas", },
 538         { /* end */ }
 539 };
 540
 541 static struct i2c_driver palmas_i2c_driver = {
 542         .driver = {
 543                    .name = "palmas",
 544                    .of_match_table = of_palmas_match_tbl,
 545                    .owner = THIS_MODULE,
 546         },
 547         .probe = palmas_i2c_probe,
 548         .remove = palmas_i2c_remove,
 549         .id_table = palmas_i2c_id,
 550 };
 551
 552 static int __init palmas_i2c_init(void)
 553 {
 554         return i2c_add_driver(&palmas_i2c_driver);
 555 }
 556 /* init early so consumer devices can complete system boot */
 557 subsys_initcall(palmas_i2c_init);
 558
 559 static void __exit palmas_i2c_exit(void)
 560 {
 561         i2c_del_driver(&palmas_i2c_driver);
 562 }
 563 module_exit(palmas_i2c_exit);
 564
 565 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 566 MODULE_DESCRIPTION("Palmas chip family multi-function driver");
 567 MODULE_LICENSE("GPL");