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/* Quanta EC driver for the Winbond Embedded Controller
*
* Copyright (C) 2009 Quanta Computer Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#define EC_ID_NAME "qci-i2cec"
#define EC_BUFFER_LEN 16
#define EC_CMD_POWER_OFF 0xAC
#define EC_CMD_RESTART 0xAB
static struct i2c_client *g_i2cec_client;
/* General structure to hold the driver data */
struct i2cec_drv_data {
struct i2c_client *i2cec_client;
struct work_struct work;
char ec_data[EC_BUFFER_LEN+1];
};
static int __devinit wpce_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int __devexit wpce_remove(struct i2c_client *kbd);
#ifdef CONFIG_PM
static int wpce_suspend(struct device *dev)
{
return 0;
}
static int wpce_resume(struct device *dev)
{
return 0;
}
#endif
#ifdef CONFIG_PM
static struct dev_pm_ops wpce_pm_ops = {
.suspend = wpce_suspend,
.resume = wpce_resume,
};
#endif
static const struct i2c_device_id wpce_idtable[] = {
{ EC_ID_NAME, 0 },
{ }
};
static struct i2c_driver wpce_driver = {
.driver = {
.owner = THIS_MODULE,
.name = EC_ID_NAME,
#ifdef CONFIG_PM
.pm = &wpce_pm_ops,
#endif
},
.probe = wpce_probe,
.remove = __devexit_p(wpce_remove),
.id_table = wpce_idtable,
};
static int __devinit wpce_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int err = -ENOMEM;
struct i2cec_drv_data *context = 0;
/* there is no need to call i2c_check_functionality() since it is the
client's job to use the interface (I2C vs SMBUS) appropriate for it. */
client->driver = &wpce_driver;
context = kzalloc(sizeof(struct i2cec_drv_data), GFP_KERNEL);
if (!context)
return err;
context->i2cec_client = client;
g_i2cec_client = client;
i2c_set_clientdata(context->i2cec_client, context);
return 0;
}
static int __devexit wpce_remove(struct i2c_client *dev)
{
struct i2cec_drv_data *context = i2c_get_clientdata(dev);
g_i2cec_client = NULL;
kfree(context);
return 0;
}
static int __init wpce_init(void)
{
return i2c_add_driver(&wpce_driver);
}
static void __exit wpce_exit(void)
{
i2c_del_driver(&wpce_driver);
}
struct i2c_client *wpce_get_i2c_client(void)
{
return g_i2cec_client;
}
EXPORT_SYMBOL_GPL(wpce_get_i2c_client);
void wpce_poweroff(void)
{
if (g_i2cec_client == NULL)
return;
i2c_smbus_write_byte(g_i2cec_client, EC_CMD_POWER_OFF);
}
EXPORT_SYMBOL_GPL(wpce_poweroff);
void wpce_restart(void)
{
if (g_i2cec_client == NULL)
return;
i2c_smbus_write_byte(g_i2cec_client, EC_CMD_RESTART);
}
EXPORT_SYMBOL_GPL(wpce_restart);
int wpce_i2c_transfer(struct i2c_msg *msg)
{
if (g_i2cec_client == NULL)
return -1;
msg->addr = g_i2cec_client->addr;
return i2c_transfer(g_i2cec_client->adapter, msg, 1);
}
EXPORT_SYMBOL_GPL(wpce_i2c_transfer);
int wpce_smbus_write_word_data(u8 command, u16 value)
{
if (g_i2cec_client == NULL)
return -1;
return i2c_smbus_write_word_data(g_i2cec_client, command, value);
}
EXPORT_SYMBOL_GPL(wpce_smbus_write_word_data);
int wpce_smbus_write_byte_data(u8 command, u8 value)
{
if (g_i2cec_client == NULL)
return -1;
return i2c_smbus_write_byte_data(g_i2cec_client, command, value);
}
EXPORT_SYMBOL_GPL(wpce_smbus_write_byte_data);
module_init(wpce_init);
module_exit(wpce_exit);
MODULE_AUTHOR("Quanta Computer Inc.");
MODULE_DESCRIPTION("Quanta Embedded Controller I2C Bridge Driver");
MODULE_LICENSE("GPL v2");
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