f6e8a1d7b4
If multiple threads try, they trip over each other badly. Signed-off-by: NeilBrown <neilb@suse.de> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
116 lines
2.4 KiB
C
116 lines
2.4 KiB
C
/*
|
|
* 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/bq27x00_battery.h>
|
|
|
|
#include "../w1.h"
|
|
#include "../w1_int.h"
|
|
#include "../w1_family.h"
|
|
|
|
#define HDQ_CMD_READ (0)
|
|
#define HDQ_CMD_WRITE (1<<7)
|
|
|
|
static int F_ID;
|
|
|
|
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->mutex);
|
|
w1_write_8(sl->master, HDQ_CMD_READ | reg);
|
|
val = w1_read_8(sl->master);
|
|
mutex_unlock(&sl->master->mutex);
|
|
|
|
return val;
|
|
}
|
|
|
|
static struct bq27000_platform_data bq27000_battery_info = {
|
|
.read = w1_bq27000_read,
|
|
.name = "bq27000-battery",
|
|
};
|
|
|
|
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));
|
|
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_unregister(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 = 1,
|
|
.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_param(F_ID, int, S_IRUSR);
|
|
MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Texas Instruments Ltd");
|
|
MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
|