Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d7ce6d1d authored by Anton Vorontsov's avatar Anton Vorontsov Committed by David Woodhouse
Browse files

[BATTERY] ds2760 W1 slave 



This is W1 slave for ds2760 chip, found inside almost every HP iPaq and
HTC PDAs/phones.

Signed-off-by: default avatarAnton Vorontsov <cbou@mail.ru>
Acked-by: default avatarEvgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
parent fb972873

drivers/w1/slaves/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -35,4 +35,17 @@ config W1_SLAVE_DS2433_CRC 
	  Each block has 30 bytes of data and a two byte CRC16.

	  Full block writes are only allowed if the CRC is valid.



config W1_SLAVE_DS2760

	tristate "Dallas 2760 battery monitor chip (HP iPAQ & others)"

	depends on W1

	help

	  If you enable this you will have the DS2760 battery monitor

	  chip support.



	  The battery monitor chip is used in many batteries/devices

	  as the one who is responsible for charging/discharging/monitoring

	  Li+ batteries.



	  If you are unsure, say N.



endmenu

drivers/w1/slaves/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,4 +5,5 @@ 
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

drivers/w1/slaves/w1_ds2760.c

0 → 100644
+213 −0
Original line number Diff line number Diff line 
/*

 * 1-Wire implementation for the ds2760 chip

 *

 * Copyright © 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>

 *

 * Use consistent with the GNU GPL is permitted,

 * provided that this copyright notice is

 * preserved in its entirety in all copies and derived works.

 *

 */



#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/idr.h>



#include "../w1.h"

#include "../w1_int.h"

#include "../w1_family.h"

#include "w1_ds2760.h"



static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,

			int io)

{

	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);



	if (!dev)

		return 0;



	mutex_lock(&sl->master->mutex);



	if (addr > DS2760_DATA_SIZE || addr < 0) {

		count = 0;

		goto out;

	}

	if (addr + count > DS2760_DATA_SIZE)

		count = DS2760_DATA_SIZE - addr;



	if (!w1_reset_select_slave(sl)) {

		if (!io) {

			w1_write_8(sl->master, W1_DS2760_READ_DATA);

			w1_write_8(sl->master, addr);

			count = w1_read_block(sl->master, buf, count);

		} else {

			w1_write_8(sl->master, W1_DS2760_WRITE_DATA);

			w1_write_8(sl->master, addr);

			w1_write_block(sl->master, buf, count);

			/* XXX w1_write_block returns void, not n_written */

		}

	}



out:

	mutex_unlock(&sl->master->mutex);



	return count;

}



int w1_ds2760_read(struct device *dev, char *buf, int addr, size_t count)

{

	return w1_ds2760_io(dev, buf, addr, count, 0);

}



int w1_ds2760_write(struct device *dev, char *buf, int addr, size_t count)

{

	return w1_ds2760_io(dev, buf, addr, count, 1);

}



static ssize_t w1_ds2760_read_bin(struct kobject *kobj, char *buf, loff_t off,

				  size_t count)

{

	struct device *dev = container_of(kobj, struct device, kobj);

	return w1_ds2760_read(dev, buf, off, count);

}



static struct bin_attribute w1_ds2760_bin_attr = {

	.attr = {

		.name = "w1_slave",

		.mode = S_IRUGO,

		.owner = THIS_MODULE,

	},

	.size = DS2760_DATA_SIZE,

	.read = w1_ds2760_read_bin,

};



static DEFINE_IDR(bat_idr);

static DEFINE_MUTEX(bat_idr_lock);



static int new_bat_id(void)

{

	int ret;



	while (1) {

		int id;



		ret = idr_pre_get(&bat_idr, GFP_KERNEL);

		if (ret == 0)

			return -ENOMEM;



		mutex_lock(&bat_idr_lock);

		ret = idr_get_new(&bat_idr, NULL, &id);

		mutex_unlock(&bat_idr_lock);



		if (ret == 0) {

			ret = id & MAX_ID_MASK;

			break;

		} else if (ret == -EAGAIN) {

			continue;

		} else {

			break;

		}

	}



	return ret;

}



static void release_bat_id(int id)

{

	mutex_lock(&bat_idr_lock);

	idr_remove(&bat_idr, id);

	mutex_unlock(&bat_idr_lock);



	return;

}



static int w1_ds2760_add_slave(struct w1_slave *sl)

{

	int ret;

	int id;

	struct platform_device *pdev;



	id = new_bat_id();

	if (id < 0) {

		ret = id;

		goto noid;

	}



	pdev = platform_device_alloc("ds2760-battery", id);

	if (!pdev) {

		ret = -ENOMEM;

		goto pdev_alloc_failed;

	}

	pdev->dev.parent = &sl->dev;



	ret = platform_device_add(pdev);

	if (ret)

		goto pdev_add_failed;



	ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);

	if (ret)

		goto bin_attr_failed;



	dev_set_drvdata(&sl->dev, pdev);



	goto success;



bin_attr_failed:

pdev_add_failed:

	platform_device_unregister(pdev);

pdev_alloc_failed:

	release_bat_id(id);

noid:

success:

	return ret;

}



static void w1_ds2760_remove_slave(struct w1_slave *sl)

{

	struct platform_device *pdev = dev_get_drvdata(&sl->dev);

	int id = pdev->id;



	platform_device_unregister(pdev);

	release_bat_id(id);

	sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);



	return;

}



static struct w1_family_ops w1_ds2760_fops = {

	.add_slave    = w1_ds2760_add_slave,

	.remove_slave = w1_ds2760_remove_slave,

};



static struct w1_family w1_ds2760_family = {

	.fid = W1_FAMILY_DS2760,

	.fops = &w1_ds2760_fops,

};



static int __init w1_ds2760_init(void)

{

	printk(KERN_INFO "1-Wire driver for the DS2760 battery monitor "

	       " chip  - (c) 2004-2005, Szabolcs Gyurko\n");

	idr_init(&bat_idr);

	return w1_register_family(&w1_ds2760_family);

}



static void __exit w1_ds2760_exit(void)

{

	w1_unregister_family(&w1_ds2760_family);

	idr_destroy(&bat_idr);

}



EXPORT_SYMBOL(w1_ds2760_read);

EXPORT_SYMBOL(w1_ds2760_write);



module_init(w1_ds2760_init);

module_exit(w1_ds2760_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>");

MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");

drivers/w1/slaves/w1_ds2760.h

0 → 100644
+50 −0
Original line number Diff line number Diff line 
/*

 * 1-Wire implementation for the ds2760 chip

 *

 * Copyright © 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>

 *

 * Use consistent with the GNU GPL is permitted,

 * provided that this copyright notice is

 * preserved in its entirety in all copies and derived works.

 *

 */



#ifndef __w1_ds2760_h__

#define __w1_ds2760_h__



/* Known commands to the DS2760 chip */

#define W1_DS2760_SWAP			0xAA

#define W1_DS2760_READ_DATA		0x69

#define W1_DS2760_WRITE_DATA		0x6C

#define W1_DS2760_COPY_DATA		0x48

#define W1_DS2760_RECALL_DATA		0xB8

#define W1_DS2760_LOCK			0x6A



/* Number of valid register addresses */

#define DS2760_DATA_SIZE		0x40



#define DS2760_PROTECTION_REG		0x00

#define DS2760_STATUS_REG		0x01

#define DS2760_EEPROM_REG		0x07

#define DS2760_SPECIAL_FEATURE_REG	0x08

#define DS2760_VOLTAGE_MSB		0x0c

#define DS2760_VOLTAGE_LSB		0x0d

#define DS2760_CURRENT_MSB		0x0e

#define DS2760_CURRENT_LSB		0x0f

#define DS2760_CURRENT_ACCUM_MSB	0x10

#define DS2760_CURRENT_ACCUM_LSB	0x11

#define DS2760_TEMP_MSB			0x18

#define DS2760_TEMP_LSB			0x19

#define DS2760_EEPROM_BLOCK0		0x20

#define DS2760_ACTIVE_FULL		0x20

#define DS2760_EEPROM_BLOCK1		0x30

#define DS2760_RATED_CAPACITY		0x32

#define DS2760_CURRENT_OFFSET_BIAS	0x33

#define DS2760_ACTIVE_EMPTY		0x3b



extern int w1_ds2760_read(struct device *dev, char *buf, int addr,

			  size_t count);

extern int w1_ds2760_write(struct device *dev, char *buf, int addr,

			   size_t count);



#endif /* !__w1_ds2760_h__ */

drivers/w1/w1_family.h

+1 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
#define W1_THERM_DS1822  	0x22

#define W1_EEPROM_DS2433  	0x23

#define W1_THERM_DS18B20 	0x28

#define W1_FAMILY_DS2760	0x30



#define MAXNAMELEN		32