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Viewing changes to drivers/mfd/tps6507x.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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drivers/mfd/tps6507x.c
 
1
/*
 
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 * tps6507x.c  --  TPS6507x chip family multi-function driver
 
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 *
 
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 *  Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
 
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 *
 
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 * Author: Todd Fischer
 
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 *         todd.fischer@ridgerun.com
 
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 *
 
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 * Credits:
 
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 *
 
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 *    Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
 
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 *
 
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 * For licencing details see kernel-base/COPYING
 
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 *
 
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 */
 
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#include <linux/module.h>
 
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#include <linux/moduleparam.h>
 
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#include <linux/init.h>
 
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#include <linux/slab.h>
 
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#include <linux/i2c.h>
 
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#include <linux/mfd/core.h>
 
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#include <linux/mfd/tps6507x.h>
 
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static struct mfd_cell tps6507x_devs[] = {
 
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        {
 
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                .name = "tps6507x-pmic",
 
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        },
 
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        {
 
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                .name = "tps6507x-ts",
 
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        },
 
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};
 
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static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
 
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                                  int bytes, void *dest)
 
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{
 
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        struct i2c_client *i2c = tps6507x->i2c_client;
 
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        struct i2c_msg xfer[2];
 
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        int ret;
 
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        /* Write register */
 
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        xfer[0].addr = i2c->addr;
 
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        xfer[0].flags = 0;
 
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        xfer[0].len = 1;
 
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        xfer[0].buf = &reg;
 
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        /* Read data */
 
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        xfer[1].addr = i2c->addr;
 
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        xfer[1].flags = I2C_M_RD;
 
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        xfer[1].len = bytes;
 
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        xfer[1].buf = dest;
 
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        ret = i2c_transfer(i2c->adapter, xfer, 2);
 
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        if (ret == 2)
 
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                ret = 0;
 
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        else if (ret >= 0)
 
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                ret = -EIO;
 
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        return ret;
 
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}
 
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static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
 
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                                   int bytes, void *src)
 
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{
 
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        struct i2c_client *i2c = tps6507x->i2c_client;
 
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        /* we add 1 byte for device register */
 
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        u8 msg[TPS6507X_MAX_REGISTER + 1];
 
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        int ret;
 
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        if (bytes > TPS6507X_MAX_REGISTER)
 
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                return -EINVAL;
 
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        msg[0] = reg;
 
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        memcpy(&msg[1], src, bytes);
 
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        ret = i2c_master_send(i2c, msg, bytes + 1);
 
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        if (ret < 0)
 
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                return ret;
 
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        if (ret != bytes + 1)
 
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                return -EIO;
 
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        return 0;
 
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}
 
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static int tps6507x_i2c_probe(struct i2c_client *i2c,
 
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                            const struct i2c_device_id *id)
 
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{
 
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        struct tps6507x_dev *tps6507x;
 
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        int ret = 0;
 
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        tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL);
 
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        if (tps6507x == NULL)
 
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                return -ENOMEM;
 
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        i2c_set_clientdata(i2c, tps6507x);
 
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        tps6507x->dev = &i2c->dev;
 
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        tps6507x->i2c_client = i2c;
 
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        tps6507x->read_dev = tps6507x_i2c_read_device;
 
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        tps6507x->write_dev = tps6507x_i2c_write_device;
 
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        ret = mfd_add_devices(tps6507x->dev, -1,
 
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                              tps6507x_devs, ARRAY_SIZE(tps6507x_devs),
 
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                              NULL, 0);
 
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        if (ret < 0)
 
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                goto err;
 
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        return ret;
 
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err:
 
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        mfd_remove_devices(tps6507x->dev);
 
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        kfree(tps6507x);
 
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        return ret;
 
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}
 
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static int tps6507x_i2c_remove(struct i2c_client *i2c)
 
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{
 
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        struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
 
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        mfd_remove_devices(tps6507x->dev);
 
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        kfree(tps6507x);
 
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        return 0;
 
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}
 
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static const struct i2c_device_id tps6507x_i2c_id[] = {
 
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       { "tps6507x", 0 },
 
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       { }
 
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};
 
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MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
 
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static struct i2c_driver tps6507x_i2c_driver = {
 
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        .driver = {
 
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                   .name = "tps6507x",
 
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                   .owner = THIS_MODULE,
 
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        },
 
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        .probe = tps6507x_i2c_probe,
 
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        .remove = tps6507x_i2c_remove,
 
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        .id_table = tps6507x_i2c_id,
 
141
};
 
142
 
 
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static int __init tps6507x_i2c_init(void)
 
144
{
 
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        return i2c_add_driver(&tps6507x_i2c_driver);
 
146
}
 
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/* init early so consumer devices can complete system boot */
 
148
subsys_initcall(tps6507x_i2c_init);
 
149
 
 
150
static void __exit tps6507x_i2c_exit(void)
 
151
{
 
152
        i2c_del_driver(&tps6507x_i2c_driver);
 
153
}
 
154
module_exit(tps6507x_i2c_exit);
 
155
 
 
156
MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
 
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MODULE_LICENSE("GPL");