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Commit cfbc6190 authored by Madhusudhan Chikkature's avatar Madhusudhan Chikkature Committed by Linus Torvalds
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hdq: bQ27000 HDQ Slave Interface Driver 



Provide the BQ27000 slave interface driver.

Signed-off-by: default avatarMadhusudhan <Chikkature&lt;madhu.cr@ti.com>
Acked-by: default avatarEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9f2bc79f

drivers/w1/slaves/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -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

drivers/w1/slaves/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -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

0 → 100644
+123 −0
Original line number Diff line number Diff line 
/*

 * 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");