drivers/mfd/tps6105x.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Core driver for TPS61050/61052 boost converters, used for while LED
   4  * driving, audio power amplification, white LED flash, and generic
   5  * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in)
   6  * and a flash synchronization pin to synchronize flash events when used as
   7  * flashgun.
   8  *
   9  * Copyright (C) 2011 ST-Ericsson SA
  10  * Written on behalf of Linaro for ST-Ericsson
  11  *
  12  * Author: Linus Walleij <linus.walleij@linaro.org>
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/i2c.h>
  18 #include <linux/regmap.h>
  19 #include <linux/gpio.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/slab.h>
  22 #include <linux/err.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/tps6105x.h>
  25
  26 static struct regmap_config tps6105x_regmap_config = {
  27         .reg_bits = 8,
  28         .val_bits = 8,
  29         .max_register = TPS6105X_REG_3,
  30 };
  31
  32 static int tps6105x_startup(struct tps6105x *tps6105x)
  33 {
  34         int ret;
  35         unsigned int regval;
  36
  37         ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, &regval);
  38         if (ret)
  39                 return ret;
  40         switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
  41         case TPS6105X_REG0_MODE_SHUTDOWN:
  42                 dev_info(&tps6105x->client->dev,
  43                          "TPS6105x found in SHUTDOWN mode\n");
  44                 break;
  45         case TPS6105X_REG0_MODE_TORCH:
  46                 dev_info(&tps6105x->client->dev,
  47                          "TPS6105x found in TORCH mode\n");
  48                 break;
  49         case TPS6105X_REG0_MODE_TORCH_FLASH:
  50                 dev_info(&tps6105x->client->dev,
  51                          "TPS6105x found in FLASH mode\n");
  52                 break;
  53         case TPS6105X_REG0_MODE_VOLTAGE:
  54                 dev_info(&tps6105x->client->dev,
  55                          "TPS6105x found in VOLTAGE mode\n");
  56                 break;
  57         default:
  58                 break;
  59         }
  60
  61         return ret;
  62 }
  63
  64 /*
  65  * MFD cells - we always have a GPIO cell and we have one cell
  66  * which is selected operation mode.
  67  */
  68 static struct mfd_cell tps6105x_gpio_cell = {
  69         .name = "tps6105x-gpio",
  70 };
  71
  72 static struct mfd_cell tps6105x_leds_cell = {
  73         .name = "tps6105x-leds",
  74 };
  75
  76 static struct mfd_cell tps6105x_flash_cell = {
  77         .name = "tps6105x-flash",
  78 };
  79
  80 static struct mfd_cell tps6105x_regulator_cell = {
  81         .name = "tps6105x-regulator",
  82 };
  83
  84 static int tps6105x_add_device(struct tps6105x *tps6105x,
  85                                struct mfd_cell *cell)
  86 {
  87         cell->platform_data = tps6105x;
  88         cell->pdata_size = sizeof(*tps6105x);
  89
  90         return mfd_add_devices(&tps6105x->client->dev,
  91                                PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL);
  92 }
  93
  94 static int tps6105x_probe(struct i2c_client *client,
  95                         const struct i2c_device_id *id)
  96 {
  97         struct tps6105x                 *tps6105x;
  98         struct tps6105x_platform_data   *pdata;
  99         int ret;
 100
 101         pdata = dev_get_platdata(&client->dev);
 102         if (!pdata) {
 103                 dev_err(&client->dev, "missing platform data\n");
 104                 return -ENODEV;
 105         }
 106
 107         tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
 108         if (!tps6105x)
 109                 return -ENOMEM;
 110
 111         tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
 112         if (IS_ERR(tps6105x->regmap))
 113                 return PTR_ERR(tps6105x->regmap);
 114
 115         i2c_set_clientdata(client, tps6105x);
 116         tps6105x->client = client;
 117         tps6105x->pdata = pdata;
 118
 119         ret = tps6105x_startup(tps6105x);
 120         if (ret) {
 121                 dev_err(&client->dev, "chip initialization failed\n");
 122                 return ret;
 123         }
 124
 125         ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
 126         if (ret)
 127                 return ret;
 128
 129         switch (pdata->mode) {
 130         case TPS6105X_MODE_SHUTDOWN:
 131                 dev_info(&client->dev,
 132                          "present, not used for anything, only GPIO\n");
 133                 break;
 134         case TPS6105X_MODE_TORCH:
 135                 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
 136                 break;
 137         case TPS6105X_MODE_TORCH_FLASH:
 138                 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
 139                 break;
 140         case TPS6105X_MODE_VOLTAGE:
 141                 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
 142                 break;
 143         default:
 144                 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
 145                 break;
 146         }
 147
 148         if (ret)
 149                 mfd_remove_devices(&client->dev);
 150
 151         return ret;
 152 }
 153
 154 static int tps6105x_remove(struct i2c_client *client)
 155 {
 156         struct tps6105x *tps6105x = i2c_get_clientdata(client);
 157
 158         mfd_remove_devices(&client->dev);
 159
 160         /* Put chip in shutdown mode */
 161         regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 162                 TPS6105X_REG0_MODE_MASK,
 163                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
 164
 165         return 0;
 166 }
 167
 168 static const struct i2c_device_id tps6105x_id[] = {
 169         { "tps61050", 0 },
 170         { "tps61052", 0 },
 171         { }
 172 };
 173 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
 174
 175 static const struct of_device_id tps6105x_of_match[] = {
 176         { .compatible = "ti,tps61050" },
 177         { .compatible = "ti,tps61052" },
 178         { },
 179 };
 180 MODULE_DEVICE_TABLE(of, tps6105x_of_match);
 181
 182 static struct i2c_driver tps6105x_driver = {
 183         .driver = {
 184                 .name   = "tps6105x",
 185                 .of_match_table = tps6105x_of_match,
 186         },
 187         .probe          = tps6105x_probe,
 188         .remove         = tps6105x_remove,
 189         .id_table       = tps6105x_id,
 190 };
 191
 192 static int __init tps6105x_init(void)
 193 {
 194         return i2c_add_driver(&tps6105x_driver);
 195 }
 196 subsys_initcall(tps6105x_init);
 197
 198 static void __exit tps6105x_exit(void)
 199 {
 200         i2c_del_driver(&tps6105x_driver);
 201 }
 202 module_exit(tps6105x_exit);
 203
 204 MODULE_AUTHOR("Linus Walleij");
 205 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
 206 MODULE_LICENSE("GPL v2");