drivers/mfd/tps6105x.c

   1 /*
   2  * Core driver for TPS61050/61052 boost converters, used for while LED
   3  * driving, audio power amplification, white LED flash, and generic
   4  * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
   5  * and a flash synchronization pin to synchronize flash events when used as
   6  * flashgun.
   7  *
   8  * Copyright (C) 2011 ST-Ericsson SA
   9  * Written on behalf of Linaro for ST-Ericsson
  10  *
  11  * Author: Linus Walleij <linus.walleij@linaro.org>
  12  *
  13  * License terms: GNU General Public License (GPL) version 2
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/i2c.h>
  19 #include <linux/regmap.h>
  20 #include <linux/gpio.h>
  21 #include <linux/spinlock.h>
  22 #include <linux/slab.h>
  23 #include <linux/err.h>
  24 #include <linux/mfd/core.h>
  25 #include <linux/mfd/tps6105x.h>
  26
  27 static struct regmap_config tps6105x_regmap_config = {
  28         .reg_bits = 8,
  29         .val_bits = 8,
  30         .max_register = TPS6105X_REG_3,
  31 };
  32
  33 static int tps6105x_startup(struct tps6105x *tps6105x)
  34 {
  35         int ret;
  36         unsigned int regval;
  37
  38         ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
  39         if (ret)
  40                 return ret;
  41         switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
  42         case TPS6105X_REG0_MODE_SHUTDOWN:
  43                 dev_info(&tps6105x->client->dev,
  44                          "TPS6105x found in SHUTDOWN mode\n");
  45                 break;
  46         case TPS6105X_REG0_MODE_TORCH:
  47                 dev_info(&tps6105x->client->dev,
  48                          "TPS6105x found in TORCH mode\n");
  49                 break;
  50         case TPS6105X_REG0_MODE_TORCH_FLASH:
  51                 dev_info(&tps6105x->client->dev,
  52                          "TPS6105x found in FLASH mode\n");
  53                 break;
  54         case TPS6105X_REG0_MODE_VOLTAGE:
  55                 dev_info(&tps6105x->client->dev,
  56                          "TPS6105x found in VOLTAGE mode\n");
  57                 break;
  58         default:
  59                 break;
  60         }
  61
  62         return ret;
  63 }
  64
  65 /*
  66  * MFD cells - we always have a GPIO cell and we have one cell
  67  * which is selected operation mode.
  68  */
  69 static struct mfd_cell tps6105x_gpio_cell = {
  70         .name = "tps6105x-gpio",
  71 };
  72
  73 static struct mfd_cell tps6105x_leds_cell = {
  74         .name = "tps6105x-leds",
  75 };
  76
  77 static struct mfd_cell tps6105x_flash_cell = {
  78         .name = "tps6105x-flash",
  79 };
  80
  81 static struct mfd_cell tps6105x_regulator_cell = {
  82         .name = "tps6105x-regulator",
  83 };
  84
  85 static int tps6105x_add_device(struct tps6105x *tps6105x,
  86                                struct mfd_cell *cell)
  87 {
  88         cell->platform_data = tps6105x;
  89         cell->pdata_size = sizeof(*tps6105x);
  90
  91         return mfd_add_devices(&tps6105x->client->dev,
  92                                PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
  93 }
  94
  95 static int tps6105x_probe(struct i2c_client *client,
  96                         const struct i2c_device_id *id)
  97 {
  98         struct tps6105x                 *tps6105x;
  99         struct tps6105x_platform_data   *pdata;
 100         int ret;
 101
 102         pdata = dev_get_platdata(&client->dev);
 103         if (!pdata) {
 104                 dev_err(&client->dev, "missing platform data\n");
 105                 return -ENODEV;
 106         }
 107
 108         tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
 109         if (!tps6105x)
 110                 return -ENOMEM;
 111
 112         tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
 113         if (IS_ERR(tps6105x->regmap))
 114                 return PTR_ERR(tps6105x->regmap);
 115
 116         i2c_set_clientdata(client, tps6105x);
 117         tps6105x->client = client;
 118         tps6105x->pdata = pdata;
 119
 120         ret = tps6105x_startup(tps6105x);
 121         if (ret) {
 122                 dev_err(&client->dev, "chip initialization failed\n");
 123                 return ret;
 124         }
 125
 126         ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
 127         if (ret)
 128                 return ret;
 129
 130         switch (pdata->mode) {
 131         case TPS6105X_MODE_SHUTDOWN:
 132                 dev_info(&client->dev,
 133                          "present, not used for anything, only GPIO\n");
 134                 break;
 135         case TPS6105X_MODE_TORCH:
 136                 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
 137                 break;
 138         case TPS6105X_MODE_TORCH_FLASH:
 139                 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
 140                 break;
 141         case TPS6105X_MODE_VOLTAGE:
 142                 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
 143                 break;
 144         default:
 145                 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
 146                 break;
 147         }
 148
 149         if (ret)
 150                 mfd_remove_devices(&client->dev);
 151
 152         return ret;
 153 }
 154
 155 static int tps6105x_remove(struct i2c_client *client)
 156 {
 157         struct tps6105x *tps6105x = i2c_get_clientdata(client);
 158
 159         mfd_remove_devices(&client->dev);
 160
 161         /* Put chip in shutdown mode */
 162         regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 163                 TPS6105X_REG0_MODE_MASK,
 164                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
 165
 166         return 0;
 167 }
 168
 169 static const struct i2c_device_id tps6105x_id[] = {
 170         { "tps61050", 0 },
 171         { "tps61052", 0 },
 172         { }
 173 };
 174 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
 175
 176 static struct i2c_driver tps6105x_driver = {
 177         .driver = {
 178                 .name   = "tps6105x",
 179         },
 180         .probe          = tps6105x_probe,
 181         .remove         = tps6105x_remove,
 182         .id_table       = tps6105x_id,
 183 };
 184
 185 static int __init tps6105x_init(void)
 186 {
 187         return i2c_add_driver(&tps6105x_driver);
 188 }
 189 subsys_initcall(tps6105x_init);
 190
 191 static void __exit tps6105x_exit(void)
 192 {
 193         i2c_del_driver(&tps6105x_driver);
 194 }
 195 module_exit(tps6105x_exit);
 196
 197 MODULE_AUTHOR("Linus Walleij");
 198 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
 199 MODULE_LICENSE("GPL v2");