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