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