drivers/mfd/s5m-core.c

   1 /*
   2  * s5m87xx.c
   3  *
   4  * Copyright (c) 2011 Samsung Electronics Co., Ltd
   5  *              http://www.samsung.com
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/init.h>
  17 #include <linux/err.h>
  18 #include <linux/slab.h>
  19 #include <linux/i2c.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/mutex.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/s5m87xx/s5m-core.h>
  25 #include <linux/mfd/s5m87xx/s5m-pmic.h>
  26 #include <linux/mfd/s5m87xx/s5m-rtc.h>
  27 #include <linux/regmap.h>
  28
  29 static struct mfd_cell s5m87xx_devs[] = {
  30         {
  31                 .name = "s5m8767-pmic",
  32         }, {
  33                 .name = "s5m-rtc",
  34         },
  35 };
  36
  37 int s5m_reg_read(struct s5m87xx_dev *s5m87xx, u8 reg, void *dest)
  38 {
  39         return regmap_read(s5m87xx->regmap, reg, dest);
  40 }
  41 EXPORT_SYMBOL_GPL(s5m_reg_read);
  42
  43 int s5m_bulk_read(struct s5m87xx_dev *s5m87xx, u8 reg, int count, u8 *buf)
  44 {
  45         return regmap_bulk_read(s5m87xx->regmap, reg, buf, count);;
  46 }
  47 EXPORT_SYMBOL_GPL(s5m_bulk_read);
  48
  49 int s5m_reg_write(struct s5m87xx_dev *s5m87xx, u8 reg, u8 value)
  50 {
  51         return regmap_write(s5m87xx->regmap, reg, value);
  52 }
  53 EXPORT_SYMBOL_GPL(s5m_reg_write);
  54
  55 int s5m_bulk_write(struct s5m87xx_dev *s5m87xx, u8 reg, int count, u8 *buf)
  56 {
  57         return regmap_raw_write(s5m87xx->regmap, reg, buf, count * sizeof(u16));
  58 }
  59 EXPORT_SYMBOL_GPL(s5m_bulk_write);
  60
  61 int s5m_reg_update(struct s5m87xx_dev *s5m87xx, u8 reg, u8 val, u8 mask)
  62 {
  63         return regmap_update_bits(s5m87xx->regmap, reg, mask, val);
  64 }
  65 EXPORT_SYMBOL_GPL(s5m_reg_update);
  66
  67 static struct regmap_config s5m_regmap_config = {
  68         .reg_bits = 8,
  69         .val_bits = 8,
  70 };
  71
  72 static int s5m87xx_i2c_probe(struct i2c_client *i2c,
  73                             const struct i2c_device_id *id)
  74 {
  75         struct s5m_platform_data *pdata = i2c->dev.platform_data;
  76         struct s5m87xx_dev *s5m87xx;
  77         int ret = 0;
  78         int error;
  79
  80         s5m87xx = kzalloc(sizeof(struct s5m87xx_dev), GFP_KERNEL);
  81         if (s5m87xx == NULL)
  82                 return -ENOMEM;
  83
  84         i2c_set_clientdata(i2c, s5m87xx);
  85         s5m87xx->dev = &i2c->dev;
  86         s5m87xx->i2c = i2c;
  87         s5m87xx->irq = i2c->irq;
  88         s5m87xx->type = id->driver_data;
  89
  90         if (pdata) {
  91                 s5m87xx->device_type = pdata->device_type;
  92                 s5m87xx->ono = pdata->ono;
  93                 s5m87xx->irq_base = pdata->irq_base;
  94                 s5m87xx->wakeup = pdata->wakeup;
  95         }
  96
  97         s5m87xx->regmap = regmap_init_i2c(i2c, &s5m_regmap_config);
  98         if (IS_ERR(s5m87xx->regmap)) {
  99                 error = PTR_ERR(s5m87xx->regmap);
 100                 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
 101                         error);
 102                 goto err;
 103         }
 104
 105         s5m87xx->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 106         i2c_set_clientdata(s5m87xx->rtc, s5m87xx);
 107
 108         if (pdata && pdata->cfg_pmic_irq)
 109                 pdata->cfg_pmic_irq();
 110
 111         s5m_irq_init(s5m87xx);
 112
 113         pm_runtime_set_active(s5m87xx->dev);
 114
 115         ret = mfd_add_devices(s5m87xx->dev, -1,
 116                                 s5m87xx_devs, ARRAY_SIZE(s5m87xx_devs),
 117                                 NULL, 0);
 118
 119         if (ret < 0)
 120                 goto err;
 121
 122         return ret;
 123
 124 err:
 125         mfd_remove_devices(s5m87xx->dev);
 126         s5m_irq_exit(s5m87xx);
 127         i2c_unregister_device(s5m87xx->rtc);
 128         regmap_exit(s5m87xx->regmap);
 129         kfree(s5m87xx);
 130         return ret;
 131 }
 132
 133 static int s5m87xx_i2c_remove(struct i2c_client *i2c)
 134 {
 135         struct s5m87xx_dev *s5m87xx = i2c_get_clientdata(i2c);
 136
 137         mfd_remove_devices(s5m87xx->dev);
 138         s5m_irq_exit(s5m87xx);
 139         i2c_unregister_device(s5m87xx->rtc);
 140         regmap_exit(s5m87xx->regmap);
 141         kfree(s5m87xx);
 142         return 0;
 143 }
 144
 145 static const struct i2c_device_id s5m87xx_i2c_id[] = {
 146         { "s5m87xx", 0 },
 147         { }
 148 };
 149 MODULE_DEVICE_TABLE(i2c, s5m87xx_i2c_id);
 150
 151 static struct i2c_driver s5m87xx_i2c_driver = {
 152         .driver = {
 153                    .name = "s5m87xx",
 154                    .owner = THIS_MODULE,
 155         },
 156         .probe = s5m87xx_i2c_probe,
 157         .remove = s5m87xx_i2c_remove,
 158         .id_table = s5m87xx_i2c_id,
 159 };
 160
 161 static int __init s5m87xx_i2c_init(void)
 162 {
 163         return i2c_add_driver(&s5m87xx_i2c_driver);
 164 }
 165
 166 subsys_initcall(s5m87xx_i2c_init);
 167
 168 static void __exit s5m87xx_i2c_exit(void)
 169 {
 170         i2c_del_driver(&s5m87xx_i2c_driver);
 171 }
 172 module_exit(s5m87xx_i2c_exit);
 173
 174 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 175 MODULE_DESCRIPTION("Core support for the S5M MFD");
 176 MODULE_LICENSE("GPL");