[linux.git] / drivers / w1 / slaves / w1_ds2780.c

/*
 * 1-Wire implementation for the ds2780 chip
 *
 * Copyright (C) 2010 Indesign, LLC
 *
 * Author: Clifton Barnes <[email protected]>
 *
 * Based on w1-ds2760 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 <linux/idr.h>

#include <linux/w1.h>

#include "w1_ds2780.h"

#define W1_FAMILY_DS2780	0x32

static int w1_ds2780_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 > DS2780_DATA_SIZE || addr < 0)
		return 0;

	count = min_t(int, count, DS2780_DATA_SIZE - addr);

	if (w1_reset_select_slave(sl) == 0) {
		if (io) {
			w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
			w1_write_8(sl->master, addr);
			w1_write_block(sl->master, buf, count);
		} else {
			w1_write_8(sl->master, W1_DS2780_READ_DATA);
			w1_write_8(sl->master, addr);
			count = w1_read_block(sl->master, buf, count);
		}
	}

	return count;
}

int w1_ds2780_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_ds2780_do_io(dev, buf, addr, count, io);

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

	return ret;
}
EXPORT_SYMBOL(w1_ds2780_io);

int w1_ds2780_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_ds2780_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_ds2780_io(dev, buf, off, count, 0);
}

static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE);

static struct bin_attribute *w1_ds2780_bin_attrs[] = {
	&bin_attr_w1_slave,
	NULL,
};

static const struct attribute_group w1_ds2780_group = {
	.bin_attrs = w1_ds2780_bin_attrs,
};

static const struct attribute_group *w1_ds2780_groups[] = {
	&w1_ds2780_group,
	NULL,
};

static int w1_ds2780_add_slave(struct w1_slave *sl)
{
	int ret;
	struct platform_device *pdev;

	pdev = platform_device_alloc("ds2780-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_ds2780_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_ds2780_fops = {
	.add_slave    = w1_ds2780_add_slave,
	.remove_slave = w1_ds2780_remove_slave,
	.groups       = w1_ds2780_groups,
};

static struct w1_family w1_ds2780_family = {
	.fid = W1_FAMILY_DS2780,
	.fops = &w1_ds2780_fops,
};
module_w1_family(w1_ds2780_family);

MODULE_AUTHOR("Clifton Barnes <[email protected]>");
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
MODULE_LICENSE("GPL");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));
Commit	Line	Data
275ac746 CB	1	/*
	2	* 1-Wire implementation for the ds2780 chip
	3	*
	4	* Copyright (C) 2010 Indesign, LLC
	5	*
	6	* Author: Clifton Barnes <[email protected]>
	7	*
	8	* Based on w1-ds2760 driver
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/device.h>
	19	#include <linux/types.h>
	20	#include <linux/platform_device.h>
	21	#include <linux/mutex.h>
	22	#include <linux/idr.h>
	23
de0d6dbd AD	24	#include <linux/w1.h>
de0d6dbd AD	25
275ac746 CB	26	#include "w1_ds2780.h"
275ac746 CB	27
de0d6dbd AD	28	#define W1_FAMILY_DS2780 0x32
de0d6dbd AD	29
9fe678fa CB	30	static int w1_ds2780_do_io(struct device dev, char buf, int addr,
9fe678fa CB	31	size_t count, int io)
275ac746 CB	32	{
	33	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	34
9fe678fa CB	35	if (addr > DS2780_DATA_SIZE \|\| addr < 0)
9fe678fa CB	36	return 0;
275ac746	37
275ac746 CB	38	count = min_t(int, count, DS2780_DATA_SIZE - addr);
	39
	40	if (w1_reset_select_slave(sl) == 0) {
	41	if (io) {
	42	w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
	43	w1_write_8(sl->master, addr);
	44	w1_write_block(sl->master, buf, count);
275ac746 CB	45	} else {
	46	w1_write_8(sl->master, W1_DS2780_READ_DATA);
	47	w1_write_8(sl->master, addr);
	48	count = w1_read_block(sl->master, buf, count);
	49	}
	50	}
	51
9fe678fa CB	52	return count;
	53	}
	54
	55	int w1_ds2780_io(struct device dev, char buf, int addr, size_t count,
	56	int io)
	57	{
	58	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	59	int ret;
	60
	61	if (!dev)
	62	return -ENODEV;
	63
b02f8bed	64	mutex_lock(&sl->master->bus_mutex);
9fe678fa CB	65
	66	ret = w1_ds2780_do_io(dev, buf, addr, count, io);
	67
b02f8bed	68	mutex_unlock(&sl->master->bus_mutex);
275ac746	69
9fe678fa	70	return ret;
275ac746 CB	71	}
	72	EXPORT_SYMBOL(w1_ds2780_io);
	73
	74	int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
	75	{
	76	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	77
	78	if (!dev)
	79	return -EINVAL;
	80
b02f8bed	81	mutex_lock(&sl->master->bus_mutex);
275ac746 CB	82
	83	if (w1_reset_select_slave(sl) == 0) {
	84	w1_write_8(sl->master, cmd);
	85	w1_write_8(sl->master, addr);
	86	}
	87
b02f8bed	88	mutex_unlock(&sl->master->bus_mutex);
275ac746 CB	89	return 0;
	90	}
	91	EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
	92
9365261d GKH	93	static ssize_t w1_slave_read(struct file filp, struct kobject kobj,
	94	struct bin_attribute bin_attr, char buf,
	95	loff_t off, size_t count)
275ac746 CB	96	{
	97	struct device *dev = container_of(kobj, struct device, kobj);
	98	return w1_ds2780_io(dev, buf, off, count, 0);
	99	}
	100
9365261d GKH	101	static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE);
	102
	103	static struct bin_attribute *w1_ds2780_bin_attrs[] = {
	104	&bin_attr_w1_slave,
	105	NULL,
	106	};
	107
	108	static const struct attribute_group w1_ds2780_group = {
	109	.bin_attrs = w1_ds2780_bin_attrs,
	110	};
	111
	112	static const struct attribute_group *w1_ds2780_groups[] = {
	113	&w1_ds2780_group,
	114	NULL,
275ac746 CB	115	};
275ac746 CB	116
275ac746 CB	117	static int w1_ds2780_add_slave(struct w1_slave *sl)
	118	{
	119	int ret;
275ac746 CB	120	struct platform_device *pdev;
275ac746 CB	121
098f9fb0 AD	122	pdev = platform_device_alloc("ds2780-battery", PLATFORM_DEVID_AUTO);
	123	if (!pdev)
	124	return -ENOMEM;
275ac746 CB	125	pdev->dev.parent = &sl->dev;
	126
	127	ret = platform_device_add(pdev);
	128	if (ret)
	129	goto pdev_add_failed;
	130
275ac746 CB	131	dev_set_drvdata(&sl->dev, pdev);
	132
	133	return 0;
	134
275ac746	135	pdev_add_failed:
c5cfedf2	136	platform_device_put(pdev);
098f9fb0	137
275ac746 CB	138	return ret;
	139	}
	140
	141	static void w1_ds2780_remove_slave(struct w1_slave *sl)
	142	{
	143	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
275ac746 CB	144
275ac746 CB	145	platform_device_unregister(pdev);
275ac746 CB	146	}
	147
	148	static struct w1_family_ops w1_ds2780_fops = {
	149	.add_slave = w1_ds2780_add_slave,
	150	.remove_slave = w1_ds2780_remove_slave,
9365261d	151	.groups = w1_ds2780_groups,
275ac746 CB	152	};
	153
	154	static struct w1_family w1_ds2780_family = {
	155	.fid = W1_FAMILY_DS2780,
	156	.fops = &w1_ds2780_fops,
	157	};
939fc832	158	module_w1_family(w1_ds2780_family);
275ac746	159
275ac746 CB	160	MODULE_AUTHOR("Clifton Barnes <[email protected]>");
275ac746 CB	161	MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
50fa2951	162	MODULE_LICENSE("GPL");
8d7bda51	163	MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));