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 have one cell which is selected operation
  68  * mode, and we always have a GPIO cell.
  69  */
  70 static struct mfd_cell tps6105x_cells[] = {
  71         {
  72                 /* name will be runtime assigned */
  73                 .id = -1,
  74         },
  75         {
  76                 .name = "tps6105x-gpio",
  77                 .id = -1,
  78         },
  79 };
  80
  81 static int tps6105x_probe(struct i2c_client *client,
  82                         const struct i2c_device_id *id)
  83 {
  84         struct tps6105x                 *tps6105x;
  85         struct tps6105x_platform_data   *pdata;
  86         int ret;
  87         int i;
  88
  89         tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
  90         if (!tps6105x)
  91                 return -ENOMEM;
  92
  93         tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
  94         if (IS_ERR(tps6105x->regmap))
  95                 return PTR_ERR(tps6105x->regmap);
  96
  97         i2c_set_clientdata(client, tps6105x);
  98         tps6105x->client = client;
  99         pdata = dev_get_platdata(&client->dev);
 100         tps6105x->pdata = pdata;
 101
 102         ret = tps6105x_startup(tps6105x);
 103         if (ret) {
 104                 dev_err(&client->dev, "chip initialization failed\n");
 105                 return ret;
 106         }
 107
 108         /* Remove warning texts when you implement new cell drivers */
 109         switch (pdata->mode) {
 110         case TPS6105X_MODE_SHUTDOWN:
 111                 dev_info(&client->dev,
 112                          "present, not used for anything, only GPIO\n");
 113                 break;
 114         case TPS6105X_MODE_TORCH:
 115                 tps6105x_cells[0].name = "tps6105x-leds";
 116                 dev_warn(&client->dev,
 117                          "torch mode is unsupported\n");
 118                 break;
 119         case TPS6105X_MODE_TORCH_FLASH:
 120                 tps6105x_cells[0].name = "tps6105x-flash";
 121                 dev_warn(&client->dev,
 122                          "flash mode is unsupported\n");
 123                 break;
 124         case TPS6105X_MODE_VOLTAGE:
 125                 tps6105x_cells[0].name ="tps6105x-regulator";
 126                 break;
 127         default:
 128                 break;
 129         }
 130
 131         /* Set up and register the platform devices. */
 132         for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
 133                 /* One state holder for all drivers, this is simple */
 134                 tps6105x_cells[i].platform_data = tps6105x;
 135                 tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
 136         }
 137
 138         return mfd_add_devices(&client->dev, 0, tps6105x_cells,
 139                                ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
 140 }
 141
 142 static int tps6105x_remove(struct i2c_client *client)
 143 {
 144         struct tps6105x *tps6105x = i2c_get_clientdata(client);
 145
 146         mfd_remove_devices(&client->dev);
 147
 148         /* Put chip in shutdown mode */
 149         regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 150                 TPS6105X_REG0_MODE_MASK,
 151                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
 152
 153         return 0;
 154 }
 155
 156 static const struct i2c_device_id tps6105x_id[] = {
 157         { "tps61050", 0 },
 158         { "tps61052", 0 },
 159         { }
 160 };
 161 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
 162
 163 static struct i2c_driver tps6105x_driver = {
 164         .driver = {
 165                 .name   = "tps6105x",
 166         },
 167         .probe          = tps6105x_probe,
 168         .remove         = tps6105x_remove,
 169         .id_table       = tps6105x_id,
 170 };
 171
 172 static int __init tps6105x_init(void)
 173 {
 174         return i2c_add_driver(&tps6105x_driver);
 175 }
 176 subsys_initcall(tps6105x_init);
 177
 178 static void __exit tps6105x_exit(void)
 179 {
 180         i2c_del_driver(&tps6105x_driver);
 181 }
 182 module_exit(tps6105x_exit);
 183
 184 MODULE_AUTHOR("Linus Walleij");
 185 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
 186 MODULE_LICENSE("GPL v2");