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/*
* drivers/w1/slaves/w1_bq27000.c
*
* Copyright (C) 2007 Texas Instruments, Inc.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/power/bq27xxx_battery.h>
#include <linux/w1.h>
#define W1_FAMILY_BQ27000 0x01
#define HDQ_CMD_READ (0)
#define HDQ_CMD_WRITE (1<<7)
static int F_ID;
module_param(F_ID, int, S_IRUSR);
MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
static int w1_bq27000_read(struct device *dev, unsigned int reg)
{
u8 val;
struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);
mutex_lock(&sl->master->bus_mutex);
w1_write_8(sl->master, HDQ_CMD_READ | reg);
val = w1_read_8(sl->master);
mutex_unlock(&sl->master->bus_mutex);
return val;
}
static struct bq27xxx_platform_data bq27000_battery_info = {
.read = w1_bq27000_read,
.name = "bq27000-battery",
.chip = BQ27000,
};
static int w1_bq27000_add_slave(struct w1_slave *sl)
{
int ret;
struct platform_device *pdev;
pdev = platform_device_alloc("bq27000-battery", -1);
if (!pdev) {
ret = -ENOMEM;
return ret;
}
ret = platform_device_add_data(pdev,
&bq27000_battery_info,
sizeof(bq27000_battery_info));
if (ret)
goto pdev_add_failed;
pdev->dev.parent = &sl->dev;
ret = platform_device_add(pdev);
if (ret)
goto pdev_add_failed;
dev_set_drvdata(&sl->dev, pdev);
goto success;
pdev_add_failed:
platform_device_put(pdev);
success:
return ret;
}
static void w1_bq27000_remove_slave(struct w1_slave *sl)
{
struct platform_device *pdev = dev_get_drvdata(&sl->dev);
platform_device_unregister(pdev);
}
static struct w1_family_ops w1_bq27000_fops = {
.add_slave = w1_bq27000_add_slave,
.remove_slave = w1_bq27000_remove_slave,
};
static struct w1_family w1_bq27000_family = {
.fid = W1_FAMILY_BQ27000,
.fops = &w1_bq27000_fops,
};
static int __init w1_bq27000_init(void)
{
if (F_ID)
w1_bq27000_family.fid = F_ID;
return w1_register_family(&w1_bq27000_family);
}
static void __exit w1_bq27000_exit(void)
{
w1_unregister_family(&w1_bq27000_family);
}
module_init(w1_bq27000_init);
module_exit(w1_bq27000_exit);
MODULE_AUTHOR("Texas Instruments Ltd");
MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000));
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