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 struct tps6105x_platform_data *tps6105x_parse_dt(struct device *dev)
  95 {
  96         struct device_node *np = dev->of_node;
  97         struct tps6105x_platform_data *pdata;
  98         struct device_node *child;
  99
 100         if (!np)
 101                 return ERR_PTR(-EINVAL);
 102         if (of_get_available_child_count(np) > 1) {
 103                 dev_err(dev, "cannot support multiple operational modes");
 104                 return ERR_PTR(-EINVAL);
 105         }
 106         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 107         if (!pdata)
 108                 return ERR_PTR(-ENOMEM);
 109         pdata->mode = TPS6105X_MODE_SHUTDOWN;
 110         for_each_available_child_of_node(np, child) {
 111                 if (child->name && !of_node_cmp(child->name, "regulator"))
 112                         pdata->mode = TPS6105X_MODE_VOLTAGE;
 113                 else if (child->name && !of_node_cmp(child->name, "led"))
 114                         pdata->mode = TPS6105X_MODE_TORCH;
 115         }
 116
 117         return pdata;
 118 }
 119
 120 static int tps6105x_probe(struct i2c_client *client)
 121 {
 122         struct tps6105x                 *tps6105x;
 123         struct tps6105x_platform_data   *pdata;
 124         int ret;
 125
 126         pdata = dev_get_platdata(&client->dev);
 127         if (!pdata)
 128                 pdata = tps6105x_parse_dt(&client->dev);
 129         if (IS_ERR(pdata)) {
 130                 dev_err(&client->dev, "No platform data or DT found");
 131                 return PTR_ERR(pdata);
 132         }
 133
 134         tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL);
 135         if (!tps6105x)
 136                 return -ENOMEM;
 137
 138         tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config);
 139         if (IS_ERR(tps6105x->regmap))
 140                 return PTR_ERR(tps6105x->regmap);
 141
 142         i2c_set_clientdata(client, tps6105x);
 143         tps6105x->client = client;
 144         tps6105x->pdata = pdata;
 145
 146         ret = tps6105x_startup(tps6105x);
 147         if (ret) {
 148                 dev_err(&client->dev, "chip initialization failed\n");
 149                 return ret;
 150         }
 151
 152         ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell);
 153         if (ret)
 154                 return ret;
 155
 156         switch (pdata->mode) {
 157         case TPS6105X_MODE_SHUTDOWN:
 158                 dev_info(&client->dev,
 159                          "present, not used for anything, only GPIO\n");
 160                 break;
 161         case TPS6105X_MODE_TORCH:
 162                 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell);
 163                 break;
 164         case TPS6105X_MODE_TORCH_FLASH:
 165                 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell);
 166                 break;
 167         case TPS6105X_MODE_VOLTAGE:
 168                 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell);
 169                 break;
 170         default:
 171                 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode);
 172                 break;
 173         }
 174
 175         if (ret)
 176                 mfd_remove_devices(&client->dev);
 177
 178         return ret;
 179 }
 180
 181 static void tps6105x_remove(struct i2c_client *client)
 182 {
 183         struct tps6105x *tps6105x = i2c_get_clientdata(client);
 184
 185         mfd_remove_devices(&client->dev);
 186
 187         /* Put chip in shutdown mode */
 188         regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
 189                 TPS6105X_REG0_MODE_MASK,
 190                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
 191 }
 192
 193 static const struct i2c_device_id tps6105x_id[] = {
 194         { "tps61050", 0 },
 195         { "tps61052", 0 },
 196         { }
 197 };
 198 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
 199
 200 static const struct of_device_id tps6105x_of_match[] = {
 201         { .compatible = "ti,tps61050" },
 202         { .compatible = "ti,tps61052" },
 203         { },
 204 };
 205 MODULE_DEVICE_TABLE(of, tps6105x_of_match);
 206
 207 static struct i2c_driver tps6105x_driver = {
 208         .driver = {
 209                 .name   = "tps6105x",
 210                 .of_match_table = tps6105x_of_match,
 211         },
 212         .probe          = tps6105x_probe,
 213         .remove         = tps6105x_remove,
 214         .id_table       = tps6105x_id,
 215 };
 216
 217 static int __init tps6105x_init(void)
 218 {
 219         return i2c_add_driver(&tps6105x_driver);
 220 }
 221 subsys_initcall(tps6105x_init);
 222
 223 static void __exit tps6105x_exit(void)
 224 {
 225         i2c_del_driver(&tps6105x_driver);
 226 }
 227 module_exit(tps6105x_exit);
 228
 229 MODULE_AUTHOR("Linus Walleij");
 230 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
 231 MODULE_LICENSE("GPL v2");