Commit fca86702 authored by Madhusudhan Chikkature Rajashekar's avatar Madhusudhan Chikkature Rajashekar Committed by Tony Lindgren

BQ27000 battery moniter HDQ/1-wire slave driver

This patch adds bq27000 battery moniter HDQ slave driver support.

Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 56c660f5
......@@ -44,4 +44,12 @@ 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
......@@ -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
/*
* 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)
int F_ID;
int family_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("omap-bq2700-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_LICENSE("GPL");
MODULE_AUTHOR("Texas Instruments Ltd");
MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
......@@ -189,6 +189,7 @@ struct w1_master *w1_search_master_id(u32 id);
u8 w1_triplet(struct w1_master *dev, int bdir);
void w1_write_8(struct w1_master *, u8);
u8 w1_read_8(struct w1_master *);
int w1_reset_bus(struct w1_master *);
u8 w1_calc_crc8(u8 *, int);
void w1_write_block(struct w1_master *, const u8 *, int);
......
......@@ -177,7 +177,7 @@ u8 w1_triplet(struct w1_master *dev, int bdir)
* @param dev the master device
* @return the byte read
*/
static u8 w1_read_8(struct w1_master * dev)
u8 w1_read_8(struct w1_master *dev)
{
int i;
u8 res = 0;
......@@ -190,6 +190,7 @@ static u8 w1_read_8(struct w1_master * dev)
return res;
}
EXPORT_SYMBOL_GPL(w1_read_8);
/**
* Writes a series of bytes.
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment