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hdq: bQ27000 HDQ Slave Interface Driver

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Provide the BQ27000 slave interface driver.

Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com>
Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Madhusudhan Chikkature 2008-11-12 13:27:11 -08:00 committed by Linus Torvalds
parent 9f2bc79f7d
commit cfbc619033
3 changed files with 131 additions and 1 deletions
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7
drivers/w1/slaves/Kconfig
View File

@ -44,4 +44,11 @@ config W1_SLAVE_DS2760
If you are unsure, say N.
config W1_SLAVE_BQ27000
tristate "BQ27000 slave support"
depends on W1
help
Say Y here if you want to use a hdq
bq27000 slave support.
endmenu

2
drivers/w1/slaves/Makefile
View File

@ -6,4 +6,4 @@ obj-$(CONFIG_W1_SLAVE_THERM) += w1_therm.o
obj-$(CONFIG_W1_SLAVE_SMEM) += w1_smem.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o
obj-$(CONFIG_W1_SLAVE_BQ27000) += w1_bq27000.o

123
drivers/w1/slaves/w1_bq27000.c Normal file
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@ -0,0 +1,123 @@
/*
* 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 "../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;
void w1_bq27000_write(struct device *dev, u8 buf, u8 reg)
{
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
if (!dev) {
pr_info("Could not obtain slave dev ptr\n");
return;
}
w1_write_8(sl->master, HDQ_CMD_WRITE | reg);
w1_write_8(sl->master, buf);
}
EXPORT_SYMBOL(w1_bq27000_write);
int w1_bq27000_read(struct device *dev, u8 reg)
{
u8 val;
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
if (!dev)
return 0;
w1_write_8(sl->master, HDQ_CMD_READ | reg);
val = w1_read_8(sl->master);
return val;
}
EXPORT_SYMBOL(w1_bq27000_read);
static int w1_bq27000_add_slave(struct w1_slave *sl)
{
int ret;
int id = 1;
struct platform_device *pdev;
pdev = platform_device_alloc("bq27000-battery", id);
if (!pdev) {
ret = -ENOMEM;
return ret;
}
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");