drivers/mfd/max8998.c

   1 /*
   2  * max8998.c - mfd core driver for the Maxim 8998
   3  *
   4  *  Copyright (C) 2009-2010 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *  Marek Szyprowski <m.szyprowski@samsung.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  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/init.h>
  26 #include <linux/slab.h>
  27 #include <linux/i2c.h>
  28 #include <linux/mutex.h>
  29 #include <linux/mfd/core.h>
  30 #include <linux/mfd/max8998.h>
  31 #include <linux/mfd/max8998-private.h>
  32
  33 #define RTC_I2C_ADDR            (0x0c >> 1)
  34
  35 static struct mfd_cell max8998_devs[] = {
  36         {
  37                 .name = "max8998-pmic",
  38         }, {
  39                 .name = "max8998-rtc",
  40         },
  41 };
  42
  43 int max8998_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest)
  44 {
  45         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  46         int ret;
  47
  48         mutex_lock(&max8998->iolock);
  49         ret = i2c_smbus_read_byte_data(i2c, reg);
  50         mutex_unlock(&max8998->iolock);
  51         if (ret < 0)
  52                 return ret;
  53
  54         ret &= 0xff;
  55         *dest = ret;
  56         return 0;
  57 }
  58 EXPORT_SYMBOL(max8998_read_reg);
  59
  60 int max8998_bulk_read(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  61 {
  62         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  63         int ret;
  64
  65         mutex_lock(&max8998->iolock);
  66         ret = i2c_smbus_read_i2c_block_data(i2c, reg, count, buf);
  67         mutex_unlock(&max8998->iolock);
  68         if (ret < 0)
  69                 return ret;
  70
  71         return 0;
  72 }
  73 EXPORT_SYMBOL(max8998_bulk_read);
  74
  75 int max8998_write_reg(struct i2c_client *i2c, u8 reg, u8 value)
  76 {
  77         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  78         int ret;
  79
  80         mutex_lock(&max8998->iolock);
  81         ret = i2c_smbus_write_byte_data(i2c, reg, value);
  82         mutex_unlock(&max8998->iolock);
  83         return ret;
  84 }
  85 EXPORT_SYMBOL(max8998_write_reg);
  86
  87 int max8998_bulk_write(struct i2c_client *i2c, u8 reg, int count, u8 *buf)
  88 {
  89         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
  90         int ret;
  91
  92         mutex_lock(&max8998->iolock);
  93         ret = i2c_smbus_write_i2c_block_data(i2c, reg, count, buf);
  94         mutex_unlock(&max8998->iolock);
  95         if (ret < 0)
  96                 return ret;
  97
  98         return 0;
  99 }
 100 EXPORT_SYMBOL(max8998_bulk_write);
 101
 102 int max8998_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask)
 103 {
 104         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 105         int ret;
 106
 107         mutex_lock(&max8998->iolock);
 108         ret = i2c_smbus_read_byte_data(i2c, reg);
 109         if (ret >= 0) {
 110                 u8 old_val = ret & 0xff;
 111                 u8 new_val = (val & mask) | (old_val & (~mask));
 112                 ret = i2c_smbus_write_byte_data(i2c, reg, new_val);
 113         }
 114         mutex_unlock(&max8998->iolock);
 115         return ret;
 116 }
 117 EXPORT_SYMBOL(max8998_update_reg);
 118
 119 static int max8998_i2c_probe(struct i2c_client *i2c,
 120                             const struct i2c_device_id *id)
 121 {
 122         struct max8998_platform_data *pdata = i2c->dev.platform_data;
 123         struct max8998_dev *max8998;
 124         int ret = 0;
 125
 126         max8998 = kzalloc(sizeof(struct max8998_dev), GFP_KERNEL);
 127         if (max8998 == NULL)
 128                 return -ENOMEM;
 129
 130         i2c_set_clientdata(i2c, max8998);
 131         max8998->dev = &i2c->dev;
 132         max8998->i2c = i2c;
 133         max8998->irq = i2c->irq;
 134         max8998->type = id->driver_data;
 135         if (pdata) {
 136                 max8998->ono = pdata->ono;
 137                 max8998->irq_base = pdata->irq_base;
 138         }
 139         mutex_init(&max8998->iolock);
 140
 141         max8998->rtc = i2c_new_dummy(i2c->adapter, RTC_I2C_ADDR);
 142         i2c_set_clientdata(max8998->rtc, max8998);
 143
 144         max8998_irq_init(max8998);
 145
 146         ret = mfd_add_devices(max8998->dev, -1,
 147                               max8998_devs, ARRAY_SIZE(max8998_devs),
 148                               NULL, 0);
 149         if (ret < 0)
 150                 goto err;
 151
 152         return ret;
 153
 154 err:
 155         mfd_remove_devices(max8998->dev);
 156         max8998_irq_exit(max8998);
 157         i2c_unregister_device(max8998->rtc);
 158         kfree(max8998);
 159         return ret;
 160 }
 161
 162 static int max8998_i2c_remove(struct i2c_client *i2c)
 163 {
 164         struct max8998_dev *max8998 = i2c_get_clientdata(i2c);
 165
 166         mfd_remove_devices(max8998->dev);
 167         max8998_irq_exit(max8998);
 168         i2c_unregister_device(max8998->rtc);
 169         kfree(max8998);
 170
 171         return 0;
 172 }
 173
 174 static const struct i2c_device_id max8998_i2c_id[] = {
 175         { "max8998", TYPE_MAX8998 },
 176         { "lp3974", TYPE_LP3974},
 177         { }
 178 };
 179 MODULE_DEVICE_TABLE(i2c, max8998_i2c_id);
 180
 181 static struct i2c_driver max8998_i2c_driver = {
 182         .driver = {
 183                    .name = "max8998",
 184                    .owner = THIS_MODULE,
 185         },
 186         .probe = max8998_i2c_probe,
 187         .remove = max8998_i2c_remove,
 188         .id_table = max8998_i2c_id,
 189 };
 190
 191 static int __init max8998_i2c_init(void)
 192 {
 193         return i2c_add_driver(&max8998_i2c_driver);
 194 }
 195 /* init early so consumer devices can complete system boot */
 196 subsys_initcall(max8998_i2c_init);
 197
 198 static void __exit max8998_i2c_exit(void)
 199 {
 200         i2c_del_driver(&max8998_i2c_driver);
 201 }
 202 module_exit(max8998_i2c_exit);
 203
 204 MODULE_DESCRIPTION("MAXIM 8998 multi-function core driver");
 205 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 206 MODULE_LICENSE("GPL");