[linux-2.6-block.git] / drivers / w1 / slaves / w1_ds2780.c

/*
 * 1-Wire implementation for the ds2780 chip
 *
 * Copyright (C) 2010 Indesign, LLC
 *
 * Author: Clifton Barnes <cabarnes@indesign-llc.com>
 *
 * 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 "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"
#include "w1_ds2780.h"

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_ds2780_read_bin(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 struct bin_attribute w1_ds2780_bin_attr = {
	.attr = {
		.name = "w1_slave",
		.mode = S_IRUGO,
	},
	.size = DS2780_DATA_SIZE,
	.read = w1_ds2780_read_bin,
};

static DEFINE_IDA(bat_ida);

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

	id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
	if (id < 0) {
		ret = id;
		goto noid;
	}

	pdev = platform_device_alloc("ds2780-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_ds2780_bin_attr);
	if (ret)
		goto bin_attr_failed;

	dev_set_drvdata(&sl->dev, pdev);

	return 0;

bin_attr_failed:
pdev_add_failed:
	platform_device_unregister(pdev);
pdev_alloc_failed:
	ida_simple_remove(&bat_ida, id);
noid:
	return ret;
}

static void w1_ds2780_remove_slave(struct w1_slave *sl)
{
	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
	int id = pdev->id;

	platform_device_unregister(pdev);
	ida_simple_remove(&bat_ida, id);
	sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2780_bin_attr);
}

static struct w1_family_ops w1_ds2780_fops = {
	.add_slave    = w1_ds2780_add_slave,
	.remove_slave = w1_ds2780_remove_slave,
};

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

static int __init w1_ds2780_init(void)
{
	ida_init(&bat_ida);
	return w1_register_family(&w1_ds2780_family);
}

static void __exit w1_ds2780_exit(void)
{
	w1_unregister_family(&w1_ds2780_family);
	ida_destroy(&bat_ida);
}

module_init(w1_ds2780_init);
module_exit(w1_ds2780_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
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 <cabarnes@indesign-llc.com>
	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
	24	#include "../w1.h"
	25	#include "../w1_int.h"
	26	#include "../w1_family.h"
	27	#include "w1_ds2780.h"
	28
9fe678fa CB	29	static int w1_ds2780_do_io(struct device dev, char buf, int addr,
9fe678fa CB	30	size_t count, int io)
275ac746 CB	31	{
	32	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	33
9fe678fa CB	34	if (addr > DS2780_DATA_SIZE \|\| addr < 0)
9fe678fa CB	35	return 0;
275ac746	36
275ac746 CB	37	count = min_t(int, count, DS2780_DATA_SIZE - addr);
	38
	39	if (w1_reset_select_slave(sl) == 0) {
	40	if (io) {
	41	w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
	42	w1_write_8(sl->master, addr);
	43	w1_write_block(sl->master, buf, count);
275ac746 CB	44	} else {
	45	w1_write_8(sl->master, W1_DS2780_READ_DATA);
	46	w1_write_8(sl->master, addr);
	47	count = w1_read_block(sl->master, buf, count);
	48	}
	49	}
	50
9fe678fa CB	51	return count;
	52	}
	53
	54	int w1_ds2780_io(struct device dev, char buf, int addr, size_t count,
	55	int io)
	56	{
	57	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	58	int ret;
	59
	60	if (!dev)
	61	return -ENODEV;
	62
b02f8bed	63	mutex_lock(&sl->master->bus_mutex);
9fe678fa CB	64
	65	ret = w1_ds2780_do_io(dev, buf, addr, count, io);
	66
b02f8bed	67	mutex_unlock(&sl->master->bus_mutex);
275ac746	68
9fe678fa	69	return ret;
275ac746 CB	70	}
	71	EXPORT_SYMBOL(w1_ds2780_io);
	72
	73	int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
	74	{
	75	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	76
	77	if (!dev)
	78	return -EINVAL;
	79
b02f8bed	80	mutex_lock(&sl->master->bus_mutex);
275ac746 CB	81
	82	if (w1_reset_select_slave(sl) == 0) {
	83	w1_write_8(sl->master, cmd);
	84	w1_write_8(sl->master, addr);
	85	}
	86
b02f8bed	87	mutex_unlock(&sl->master->bus_mutex);
275ac746 CB	88	return 0;
	89	}
	90	EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
	91
	92	static ssize_t w1_ds2780_read_bin(struct file *filp,
	93	struct kobject *kobj,
	94	struct bin_attribute *bin_attr,
	95	char *buf, loff_t off, size_t count)
	96	{
	97	struct device *dev = container_of(kobj, struct device, kobj);
	98	return w1_ds2780_io(dev, buf, off, count, 0);
	99	}
	100
	101	static struct bin_attribute w1_ds2780_bin_attr = {
	102	.attr = {
	103	.name = "w1_slave",
	104	.mode = S_IRUGO,
	105	},
	106	.size = DS2780_DATA_SIZE,
	107	.read = w1_ds2780_read_bin,
	108	};
	109
3e542817	110	static DEFINE_IDA(bat_ida);
275ac746 CB	111
	112	static int w1_ds2780_add_slave(struct w1_slave *sl)
	113	{
	114	int ret;
	115	int id;
	116	struct platform_device *pdev;
	117
3e542817	118	id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
275ac746 CB	119	if (id < 0) {
	120	ret = id;
	121	goto noid;
	122	}
	123
	124	pdev = platform_device_alloc("ds2780-battery", id);
	125	if (!pdev) {
	126	ret = -ENOMEM;
	127	goto pdev_alloc_failed;
	128	}
	129	pdev->dev.parent = &sl->dev;
	130
	131	ret = platform_device_add(pdev);
	132	if (ret)
	133	goto pdev_add_failed;
	134
	135	ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2780_bin_attr);
	136	if (ret)
	137	goto bin_attr_failed;
	138
	139	dev_set_drvdata(&sl->dev, pdev);
	140
	141	return 0;
	142
	143	bin_attr_failed:
	144	pdev_add_failed:
	145	platform_device_unregister(pdev);
	146	pdev_alloc_failed:
3e542817	147	ida_simple_remove(&bat_ida, id);
275ac746 CB	148	noid:
	149	return ret;
	150	}
	151
	152	static void w1_ds2780_remove_slave(struct w1_slave *sl)
	153	{
	154	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
	155	int id = pdev->id;
	156
	157	platform_device_unregister(pdev);
3e542817	158	ida_simple_remove(&bat_ida, id);
275ac746 CB	159	sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2780_bin_attr);
	160	}
	161
	162	static struct w1_family_ops w1_ds2780_fops = {
	163	.add_slave = w1_ds2780_add_slave,
	164	.remove_slave = w1_ds2780_remove_slave,
	165	};
	166
	167	static struct w1_family w1_ds2780_family = {
	168	.fid = W1_FAMILY_DS2780,
	169	.fops = &w1_ds2780_fops,
	170	};
	171
	172	static int __init w1_ds2780_init(void)
	173	{
3e542817	174	ida_init(&bat_ida);
275ac746 CB	175	return w1_register_family(&w1_ds2780_family);
	176	}
	177
	178	static void __exit w1_ds2780_exit(void)
	179	{
	180	w1_unregister_family(&w1_ds2780_family);
3e542817	181	ida_destroy(&bat_ida);
275ac746 CB	182	}
	183
	184	module_init(w1_ds2780_init);
	185	module_exit(w1_ds2780_exit);
	186
	187	MODULE_LICENSE("GPL");
	188	MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
	189	MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");