[deliverable/linux.git] / drivers / w1 / slaves / w1_ds2781.c

/*
 * 1-Wire implementation for the ds2781 chip
 *
 * Author: Renata Sayakhova <renata@oktetlabs.ru>
 *
 * Based on w1-ds2780 driver
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#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"
#include "w1_ds2781.h"

static int w1_ds2781_do_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 (addr > DS2781_DATA_SIZE || addr < 0)
		return 0;

	count = min_t(int, count, DS2781_DATA_SIZE - addr);

	if (w1_reset_select_slave(sl) == 0) {
		if (io) {
			w1_write_8(sl->master, W1_DS2781_WRITE_DATA);
			w1_write_8(sl->master, addr);
			w1_write_block(sl->master, buf, count);
		} else {
			w1_write_8(sl->master, W1_DS2781_READ_DATA);
			w1_write_8(sl->master, addr);
			count = w1_read_block(sl->master, buf, count);
		}
	}

	return count;
}

int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count,
			int io)
{
	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	int ret;

	if (!dev)
		return -ENODEV;

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

	ret = w1_ds2781_do_io(dev, buf, addr, count, io);

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

	return ret;
}
EXPORT_SYMBOL(w1_ds2781_io);

int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
{
	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);

	if (!dev)
		return -EINVAL;

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

	if (w1_reset_select_slave(sl) == 0) {
		w1_write_8(sl->master, cmd);
		w1_write_8(sl->master, addr);
	}

	mutex_unlock(&sl->master->bus_mutex);
	return 0;
}
EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);

static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
			     struct bin_attribute *bin_attr, char *buf,
			     loff_t off, size_t count)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	return w1_ds2781_io(dev, buf, off, count, 0);
}

static BIN_ATTR_RO(w1_slave, DS2781_DATA_SIZE);

static struct bin_attribute *w1_ds2781_bin_attrs[] = {
	&bin_attr_w1_slave,
	NULL,
};

static const struct attribute_group w1_ds2781_group = {
	.bin_attrs = w1_ds2781_bin_attrs,
};

static const struct attribute_group *w1_ds2781_groups[] = {
	&w1_ds2781_group,
	NULL,
};

static int w1_ds2781_add_slave(struct w1_slave *sl)
{
	int ret;
	struct platform_device *pdev;

	pdev = platform_device_alloc("ds2781-battery", PLATFORM_DEVID_AUTO);
	if (!pdev)
		return -ENOMEM;
	pdev->dev.parent = &sl->dev;

	ret = platform_device_add(pdev);
	if (ret)
		goto pdev_add_failed;

	dev_set_drvdata(&sl->dev, pdev);

	return 0;

pdev_add_failed:
	platform_device_put(pdev);

	return ret;
}

static void w1_ds2781_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_ds2781_fops = {
	.add_slave    = w1_ds2781_add_slave,
	.remove_slave = w1_ds2781_remove_slave,
	.groups       = w1_ds2781_groups,
};

static struct w1_family w1_ds2781_family = {
	.fid = W1_FAMILY_DS2781,
	.fops = &w1_ds2781_fops,
};
module_w1_family(w1_ds2781_family);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));
Commit	Line	Data
fef37e9a RS	1	/*
	2	* 1-Wire implementation for the ds2781 chip
	3	*
	4	* Author: Renata Sayakhova <renata@oktetlabs.ru>
	5	*
	6	* Based on w1-ds2780 driver
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/device.h>
	17	#include <linux/types.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/mutex.h>
fef37e9a RS	20
	21	#include "../w1.h"
	22	#include "../w1_int.h"
	23	#include "../w1_family.h"
	24	#include "w1_ds2781.h"
	25
	26	static int w1_ds2781_do_io(struct device dev, char buf, int addr,
	27	size_t count, int io)
	28	{
	29	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	30
	31	if (addr > DS2781_DATA_SIZE \|\| addr < 0)
	32	return 0;
	33
	34	count = min_t(int, count, DS2781_DATA_SIZE - addr);
	35
	36	if (w1_reset_select_slave(sl) == 0) {
	37	if (io) {
	38	w1_write_8(sl->master, W1_DS2781_WRITE_DATA);
	39	w1_write_8(sl->master, addr);
	40	w1_write_block(sl->master, buf, count);
	41	} else {
	42	w1_write_8(sl->master, W1_DS2781_READ_DATA);
	43	w1_write_8(sl->master, addr);
	44	count = w1_read_block(sl->master, buf, count);
	45	}
	46	}
	47
	48	return count;
	49	}
	50
	51	int w1_ds2781_io(struct device dev, char buf, int addr, size_t count,
	52	int io)
	53	{
	54	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	55	int ret;
	56
	57	if (!dev)
	58	return -ENODEV;
	59
b02f8bed	60	mutex_lock(&sl->master->bus_mutex);
fef37e9a RS	61
	62	ret = w1_ds2781_do_io(dev, buf, addr, count, io);
	63
b02f8bed	64	mutex_unlock(&sl->master->bus_mutex);
fef37e9a RS	65
	66	return ret;
	67	}
	68	EXPORT_SYMBOL(w1_ds2781_io);
	69
fef37e9a RS	70	int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
	71	{
	72	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	73
	74	if (!dev)
	75	return -EINVAL;
	76
b02f8bed	77	mutex_lock(&sl->master->bus_mutex);
fef37e9a RS	78
	79	if (w1_reset_select_slave(sl) == 0) {
	80	w1_write_8(sl->master, cmd);
	81	w1_write_8(sl->master, addr);
	82	}
	83
b02f8bed	84	mutex_unlock(&sl->master->bus_mutex);
fef37e9a RS	85	return 0;
	86	}
	87	EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);
	88
eefafb79 GKH	89	static ssize_t w1_slave_read(struct file filp, struct kobject kobj,
	90	struct bin_attribute bin_attr, char buf,
	91	loff_t off, size_t count)
fef37e9a RS	92	{
	93	struct device *dev = container_of(kobj, struct device, kobj);
	94	return w1_ds2781_io(dev, buf, off, count, 0);
	95	}
	96
eefafb79 GKH	97	static BIN_ATTR_RO(w1_slave, DS2781_DATA_SIZE);
	98
	99	static struct bin_attribute *w1_ds2781_bin_attrs[] = {
	100	&bin_attr_w1_slave,
	101	NULL,
	102	};
	103
	104	static const struct attribute_group w1_ds2781_group = {
	105	.bin_attrs = w1_ds2781_bin_attrs,
	106	};
	107
	108	static const struct attribute_group *w1_ds2781_groups[] = {
	109	&w1_ds2781_group,
	110	NULL,
fef37e9a RS	111	};
fef37e9a RS	112
fef37e9a RS	113	static int w1_ds2781_add_slave(struct w1_slave *sl)
	114	{
	115	int ret;
fef37e9a RS	116	struct platform_device *pdev;
fef37e9a RS	117
098f9fb0 AD	118	pdev = platform_device_alloc("ds2781-battery", PLATFORM_DEVID_AUTO);
	119	if (!pdev)
	120	return -ENOMEM;
fef37e9a RS	121	pdev->dev.parent = &sl->dev;
	122
	123	ret = platform_device_add(pdev);
	124	if (ret)
	125	goto pdev_add_failed;
	126
fef37e9a RS	127	dev_set_drvdata(&sl->dev, pdev);
	128
	129	return 0;
	130
fef37e9a	131	pdev_add_failed:
c28d6f2d	132	platform_device_put(pdev);
098f9fb0	133
fef37e9a RS	134	return ret;
	135	}
	136
	137	static void w1_ds2781_remove_slave(struct w1_slave *sl)
	138	{
	139	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
fef37e9a RS	140
fef37e9a RS	141	platform_device_unregister(pdev);
fef37e9a RS	142	}
	143
	144	static struct w1_family_ops w1_ds2781_fops = {
	145	.add_slave = w1_ds2781_add_slave,
	146	.remove_slave = w1_ds2781_remove_slave,
eefafb79	147	.groups = w1_ds2781_groups,
fef37e9a RS	148	};
	149
	150	static struct w1_family w1_ds2781_family = {
	151	.fid = W1_FAMILY_DS2781,
	152	.fops = &w1_ds2781_fops,
	153	};
939fc832	154	module_w1_family(w1_ds2781_family);
fef37e9a RS	155
	156	MODULE_LICENSE("GPL");
	157	MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
	158	MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
8d7bda51	159	MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));