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/mutex.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 int tps6105x_set(struct tps6105x *tps6105x, u8 reg, u8 value)
  29 {
  30         int ret;
  31
  32         ret = mutex_lock_interruptible(&tps6105x->lock);
  33         if (ret)
  34                 return ret;
  35         ret = i2c_smbus_write_byte_data(tps6105x->client, reg, value);
  36         mutex_unlock(&tps6105x->lock);
  37         if (ret < 0)
  38                 return ret;
  39
  40         return 0;
  41 }
  42 EXPORT_SYMBOL(tps6105x_set);
  43
  44 int tps6105x_get(struct tps6105x *tps6105x, u8 reg, u8 *buf)
  45 {
  46         int ret;
  47
  48         ret = mutex_lock_interruptible(&tps6105x->lock);
  49         if (ret)
  50                 return ret;
  51         ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
  52         mutex_unlock(&tps6105x->lock);
  53         if (ret < 0)
  54                 return ret;
  55
  56         *buf = ret;
  57         return 0;
  58 }
  59 EXPORT_SYMBOL(tps6105x_get);
  60
  61 /*
  62  * Masks off the bits in the mask and sets the bits in the bitvalues
  63  * parameter in one atomic operation
  64  */
  65 int tps6105x_mask_and_set(struct tps6105x *tps6105x, u8 reg,
  66                           u8 bitmask, u8 bitvalues)
  67 {
  68         int ret;
  69         u8 regval;
  70
  71         ret = mutex_lock_interruptible(&tps6105x->lock);
  72         if (ret)
  73                 return ret;
  74         ret = i2c_smbus_read_byte_data(tps6105x->client, reg);
  75         if (ret < 0)
  76                 goto fail;
  77         regval = ret;
  78         regval = (~bitmask & regval) | (bitmask & bitvalues);
  79         ret = i2c_smbus_write_byte_data(tps6105x->client, reg, regval);
  80 fail:
  81         mutex_unlock(&tps6105x->lock);
  82         if (ret < 0)
  83                 return ret;
  84
  85         return 0;
  86 }
  87 EXPORT_SYMBOL(tps6105x_mask_and_set);
  88
  89 static int tps6105x_startup(struct tps6105x *tps6105x)
  90 {
  91         int ret;
  92         u8 regval;
  93
  94         ret = tps6105x_get(tps6105x, TPS6105X_REG_0, &regval);
  95         if (ret)
  96                 return ret;
  97         switch (regval >> TPS6105X_REG0_MODE_SHIFT) {
  98         case TPS6105X_REG0_MODE_SHUTDOWN:
  99                 dev_info(&tps6105x->client->dev,
 100                          "TPS6105x found in SHUTDOWN mode\n");
 101                 break;
 102         case TPS6105X_REG0_MODE_TORCH:
 103                 dev_info(&tps6105x->client->dev,
 104                          "TPS6105x found in TORCH mode\n");
 105                 break;
 106         case TPS6105X_REG0_MODE_TORCH_FLASH:
 107                 dev_info(&tps6105x->client->dev,
 108                          "TPS6105x found in FLASH mode\n");
 109                 break;
 110         case TPS6105X_REG0_MODE_VOLTAGE:
 111                 dev_info(&tps6105x->client->dev,
 112                          "TPS6105x found in VOLTAGE mode\n");
 113                 break;
 114         default:
 115                 break;
 116         }
 117
 118         return ret;
 119 }
 120
 121 /*
 122  * MFD cells - we have one cell which is selected operation
 123  * mode, and we always have a GPIO cell.
 124  */
 125 static struct mfd_cell tps6105x_cells[] = {
 126         {
 127                 /* name will be runtime assigned */
 128                 .id = -1,
 129         },
 130         {
 131                 .name = "tps6105x-gpio",
 132                 .id = -1,
 133         },
 134 };
 135
 136 static int tps6105x_probe(struct i2c_client *client,
 137                         const struct i2c_device_id *id)
 138 {
 139         struct tps6105x                 *tps6105x;
 140         struct tps6105x_platform_data   *pdata;
 141         int ret;
 142         int i;
 143
 144         tps6105x = kmalloc(sizeof(*tps6105x), GFP_KERNEL);
 145         if (!tps6105x)
 146                 return -ENOMEM;
 147
 148         i2c_set_clientdata(client, tps6105x);
 149         tps6105x->client = client;
 150         pdata = client->dev.platform_data;
 151         tps6105x->pdata = pdata;
 152         mutex_init(&tps6105x->lock);
 153
 154         ret = tps6105x_startup(tps6105x);
 155         if (ret) {
 156                 dev_err(&client->dev, "chip initialization failed\n");
 157                 goto fail;
 158         }
 159
 160         /* Remove warning texts when you implement new cell drivers */
 161         switch (pdata->mode) {
 162         case TPS6105X_MODE_SHUTDOWN:
 163                 dev_info(&client->dev,
 164                          "present, not used for anything, only GPIO\n");
 165                 break;
 166         case TPS6105X_MODE_TORCH:
 167                 tps6105x_cells[0].name = "tps6105x-leds";
 168                 dev_warn(&client->dev,
 169                          "torch mode is unsupported\n");
 170                 break;
 171         case TPS6105X_MODE_TORCH_FLASH:
 172                 tps6105x_cells[0].name = "tps6105x-flash";
 173                 dev_warn(&client->dev,
 174                          "flash mode is unsupported\n");
 175                 break;
 176         case TPS6105X_MODE_VOLTAGE:
 177                 tps6105x_cells[0].name ="tps6105x-regulator";
 178                 break;
 179         default:
 180                 break;
 181         }
 182
 183         /* Set up and register the platform devices. */
 184         for (i = 0; i < ARRAY_SIZE(tps6105x_cells); i++) {
 185                 /* One state holder for all drivers, this is simple */
 186                 tps6105x_cells[i].platform_data = tps6105x;
 187                 tps6105x_cells[i].pdata_size = sizeof(*tps6105x);
 188         }
 189
 190         ret = mfd_add_devices(&client->dev, 0, tps6105x_cells,
 191                               ARRAY_SIZE(tps6105x_cells), NULL, 0, NULL);
 192         if (ret)
 193                 goto fail;
 194
 195         return 0;
 196
 197 fail:
 198         kfree(tps6105x);
 199         return ret;
 200 }
 201
 202 static int tps6105x_remove(struct i2c_client *client)
 203 {
 204         struct tps6105x *tps6105x = i2c_get_clientdata(client);
 205
 206         mfd_remove_devices(&client->dev);
 207
 208         /* Put chip in shutdown mode */
 209         tps6105x_mask_and_set(tps6105x, TPS6105X_REG_0,
 210                 TPS6105X_REG0_MODE_MASK,
 211                 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT);
 212
 213         kfree(tps6105x);
 214         return 0;
 215 }
 216
 217 static const struct i2c_device_id tps6105x_id[] = {
 218         { "tps61050", 0 },
 219         { "tps61052", 0 },
 220         { }
 221 };
 222 MODULE_DEVICE_TABLE(i2c, tps6105x_id);
 223
 224 static struct i2c_driver tps6105x_driver = {
 225         .driver = {
 226                 .name   = "tps6105x",
 227         },
 228         .probe          = tps6105x_probe,
 229         .remove         = tps6105x_remove,
 230         .id_table       = tps6105x_id,
 231 };
 232
 233 static int __init tps6105x_init(void)
 234 {
 235         return i2c_add_driver(&tps6105x_driver);
 236 }
 237 subsys_initcall(tps6105x_init);
 238
 239 static void __exit tps6105x_exit(void)
 240 {
 241         i2c_del_driver(&tps6105x_driver);
 242 }
 243 module_exit(tps6105x_exit);
 244
 245 MODULE_AUTHOR("Linus Walleij");
 246 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver");
 247 MODULE_LICENSE("GPL v2");