drivers/mfd/da9052-i2c.c

   1 /*
   2  * I2C access for DA9052 PMICs.
   3  *
   4  * Copyright(c) 2011 Dialog Semiconductor Ltd.
   5  *
   6  * Author: David Dajun Chen <dchen@diasemi.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  */
  14
  15 #include <linux/device.h>
  16 #include <linux/module.h>
  17 #include <linux/input.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/i2c.h>
  20 #include <linux/err.h>
  21
  22 #include <linux/mfd/da9052/da9052.h>
  23 #include <linux/mfd/da9052/reg.h>
  24
  25 static int da9052_i2c_enable_multiwrite(struct da9052 *da9052)
  26 {
  27         int reg_val, ret;
  28
  29         ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, &reg_val);
  30         if (ret < 0)
  31                 return ret;
  32
  33         if (reg_val & DA9052_CONTROL_B_WRITEMODE) {
  34                 reg_val &= ~DA9052_CONTROL_B_WRITEMODE;
  35                 ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
  36                                    reg_val);
  37                 if (ret < 0)
  38                         return ret;
  39         }
  40
  41         return 0;
  42 }
  43
  44 static int __devinit da9052_i2c_probe(struct i2c_client *client,
  45                                        const struct i2c_device_id *id)
  46 {
  47         struct da9052 *da9052;
  48         int ret;
  49
  50         da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL);
  51         if (!da9052)
  52                 return -ENOMEM;
  53
  54         if (!i2c_check_functionality(client->adapter,
  55                                      I2C_FUNC_SMBUS_BYTE_DATA)) {
  56                 dev_info(&client->dev, "Error in %s:i2c_check_functionality\n",
  57                          __func__);
  58                 ret = -ENODEV;
  59                 goto err;
  60         }
  61
  62         da9052->dev = &client->dev;
  63         da9052->chip_irq = client->irq;
  64
  65         i2c_set_clientdata(client, da9052);
  66
  67         da9052->regmap = regmap_init_i2c(client, &da9052_regmap_config);
  68         if (IS_ERR(da9052->regmap)) {
  69                 ret = PTR_ERR(da9052->regmap);
  70                 dev_err(&client->dev, "Failed to allocate register map: %d\n",
  71                         ret);
  72                 goto err;
  73         }
  74
  75         ret = da9052_i2c_enable_multiwrite(da9052);
  76         if (ret < 0)
  77                 goto err;
  78
  79         ret = da9052_device_init(da9052, id->driver_data);
  80         if (ret != 0)
  81                 goto err;
  82
  83         return 0;
  84
  85 err:
  86         kfree(da9052);
  87         return ret;
  88 }
  89
  90 static int da9052_i2c_remove(struct i2c_client *client)
  91 {
  92         struct da9052 *da9052 = i2c_get_clientdata(client);
  93
  94         da9052_device_exit(da9052);
  95         kfree(da9052);
  96
  97         return 0;
  98 }
  99
 100 static struct i2c_device_id da9052_i2c_id[] = {
 101         {"da9052", DA9052},
 102         {"da9053-aa", DA9053_AA},
 103         {"da9053-ba", DA9053_BA},
 104         {"da9053-bb", DA9053_BB},
 105         {}
 106 };
 107
 108 static struct i2c_driver da9052_i2c_driver = {
 109         .probe = da9052_i2c_probe,
 110         .remove = da9052_i2c_remove,
 111         .id_table = da9052_i2c_id,
 112         .driver = {
 113                 .name = "da9052",
 114                 .owner = THIS_MODULE,
 115         },
 116 };
 117
 118 static int __init da9052_i2c_init(void)
 119 {
 120         int ret;
 121
 122         ret = i2c_add_driver(&da9052_i2c_driver);
 123         if (ret != 0) {
 124                 pr_err("DA9052 I2C registration failed %d\n", ret);
 125                 return ret;
 126         }
 127
 128         return 0;
 129 }
 130 subsys_initcall(da9052_i2c_init);
 131
 132 static void __exit da9052_i2c_exit(void)
 133 {
 134         i2c_del_driver(&da9052_i2c_driver);
 135 }
 136 module_exit(da9052_i2c_exit);
 137
 138 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 139 MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
 140 MODULE_LICENSE("GPL");