132 lines
2.8 KiB
C
132 lines
2.8 KiB
C
/*
|
|
* wm8350-i2c.c -- Generic I2C driver for Wolfson WM8350 PMIC
|
|
*
|
|
* Copyright 2007, 2008 Wolfson Microelectronics PLC.
|
|
*
|
|
* Author: Liam Girdwood
|
|
* linux@wolfsonmicro.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/init.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/mfd/wm8350/core.h>
|
|
|
|
static int wm8350_i2c_read_device(struct wm8350 *wm8350, char reg,
|
|
int bytes, void *dest)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_master_send(wm8350->i2c_client, ®, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = i2c_master_recv(wm8350->i2c_client, dest, bytes);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != bytes)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static int wm8350_i2c_write_device(struct wm8350 *wm8350, char reg,
|
|
int bytes, void *src)
|
|
{
|
|
/* we add 1 byte for device register */
|
|
u8 msg[(WM8350_MAX_REGISTER << 1) + 1];
|
|
int ret;
|
|
|
|
if (bytes > ((WM8350_MAX_REGISTER << 1) + 1))
|
|
return -EINVAL;
|
|
|
|
msg[0] = reg;
|
|
memcpy(&msg[1], src, bytes);
|
|
ret = i2c_master_send(wm8350->i2c_client, msg, bytes + 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != bytes + 1)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static int wm8350_i2c_probe(struct i2c_client *i2c,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct wm8350 *wm8350;
|
|
int ret = 0;
|
|
|
|
wm8350 = kzalloc(sizeof(struct wm8350), GFP_KERNEL);
|
|
if (wm8350 == NULL) {
|
|
kfree(i2c);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
i2c_set_clientdata(i2c, wm8350);
|
|
wm8350->dev = &i2c->dev;
|
|
wm8350->i2c_client = i2c;
|
|
wm8350->read_dev = wm8350_i2c_read_device;
|
|
wm8350->write_dev = wm8350_i2c_write_device;
|
|
|
|
ret = wm8350_device_init(wm8350, i2c->irq, i2c->dev.platform_data);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
return ret;
|
|
|
|
err:
|
|
kfree(wm8350);
|
|
return ret;
|
|
}
|
|
|
|
static int wm8350_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct wm8350 *wm8350 = i2c_get_clientdata(i2c);
|
|
|
|
wm8350_device_exit(wm8350);
|
|
kfree(wm8350);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id wm8350_i2c_id[] = {
|
|
{ "wm8350", 0 },
|
|
{ "wm8351", 0 },
|
|
{ "wm8352", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, wm8350_i2c_id);
|
|
|
|
|
|
static struct i2c_driver wm8350_i2c_driver = {
|
|
.driver = {
|
|
.name = "wm8350",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = wm8350_i2c_probe,
|
|
.remove = wm8350_i2c_remove,
|
|
.id_table = wm8350_i2c_id,
|
|
};
|
|
|
|
static int __init wm8350_i2c_init(void)
|
|
{
|
|
return i2c_add_driver(&wm8350_i2c_driver);
|
|
}
|
|
/* init early so consumer devices can complete system boot */
|
|
subsys_initcall(wm8350_i2c_init);
|
|
|
|
static void __exit wm8350_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&wm8350_i2c_driver);
|
|
}
|
|
module_exit(wm8350_i2c_exit);
|
|
|
|
MODULE_DESCRIPTION("I2C support for the WM8350 AudioPlus PMIC");
|
|
MODULE_LICENSE("GPL");
|