[mirror_ubuntu-bionic-kernel.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 <linux/idr.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_ds2781_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_ds2781_io(dev, buf, off, count, 0);
}

static struct bin_attribute w1_ds2781_bin_attr = {
	.attr = {
		.name = "w1_slave",
		.mode = S_IRUGO,
	},
	.size = DS2781_DATA_SIZE,
	.read = w1_ds2781_read_bin,
};

static DEFINE_IDA(bat_ida);

static int w1_ds2781_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("ds2781-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_ds2781_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_ds2781_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_ds2781_bin_attr);
}

static struct w1_family_ops w1_ds2781_fops = {
	.add_slave    = w1_ds2781_add_slave,
	.remove_slave = w1_ds2781_remove_slave,
};

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

static int __init w1_ds2781_init(void)
{
	ida_init(&bat_ida);
	return w1_register_family(&w1_ds2781_family);
}

static void __exit w1_ds2781_exit(void)
{
	w1_unregister_family(&w1_ds2781_family);
	ida_destroy(&bat_ida);
}

module_init(w1_ds2781_init);
module_exit(w1_ds2781_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
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>
	20	#include <linux/idr.h>
	21
	22	#include "../w1.h"
	23	#include "../w1_int.h"
	24	#include "../w1_family.h"
	25	#include "w1_ds2781.h"
	26
	27	static int w1_ds2781_do_io(struct device dev, char buf, int addr,
	28	size_t count, int io)
	29	{
	30	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	31
	32	if (addr > DS2781_DATA_SIZE \|\| addr < 0)
	33	return 0;
	34
	35	count = min_t(int, count, DS2781_DATA_SIZE - addr);
	36
	37	if (w1_reset_select_slave(sl) == 0) {
	38	if (io) {
	39	w1_write_8(sl->master, W1_DS2781_WRITE_DATA);
	40	w1_write_8(sl->master, addr);
	41	w1_write_block(sl->master, buf, count);
	42	} else {
	43	w1_write_8(sl->master, W1_DS2781_READ_DATA);
	44	w1_write_8(sl->master, addr);
	45	count = w1_read_block(sl->master, buf, count);
	46	}
	47	}
	48
	49	return count;
	50	}
	51
	52	int w1_ds2781_io(struct device dev, char buf, int addr, size_t count,
	53	int io)
	54	{
	55	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	56	int ret;
	57
	58	if (!dev)
	59	return -ENODEV;
	60
b02f8bed	61	mutex_lock(&sl->master->bus_mutex);
fef37e9a RS	62
	63	ret = w1_ds2781_do_io(dev, buf, addr, count, io);
	64
b02f8bed	65	mutex_unlock(&sl->master->bus_mutex);
fef37e9a RS	66
	67	return ret;
	68	}
	69	EXPORT_SYMBOL(w1_ds2781_io);
	70
fef37e9a RS	71	int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
	72	{
	73	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	74
	75	if (!dev)
	76	return -EINVAL;
	77
b02f8bed	78	mutex_lock(&sl->master->bus_mutex);
fef37e9a RS	79
	80	if (w1_reset_select_slave(sl) == 0) {
	81	w1_write_8(sl->master, cmd);
	82	w1_write_8(sl->master, addr);
	83	}
	84
b02f8bed	85	mutex_unlock(&sl->master->bus_mutex);
fef37e9a RS	86	return 0;
	87	}
	88	EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);
	89
	90	static ssize_t w1_ds2781_read_bin(struct file *filp,
	91	struct kobject *kobj,
	92	struct bin_attribute *bin_attr,
	93	char *buf, loff_t off, size_t count)
	94	{
	95	struct device *dev = container_of(kobj, struct device, kobj);
	96	return w1_ds2781_io(dev, buf, off, count, 0);
	97	}
	98
	99	static struct bin_attribute w1_ds2781_bin_attr = {
	100	.attr = {
	101	.name = "w1_slave",
	102	.mode = S_IRUGO,
	103	},
	104	.size = DS2781_DATA_SIZE,
	105	.read = w1_ds2781_read_bin,
	106	};
	107
	108	static DEFINE_IDA(bat_ida);
	109
	110	static int w1_ds2781_add_slave(struct w1_slave *sl)
	111	{
	112	int ret;
	113	int id;
	114	struct platform_device *pdev;
	115
	116	id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
	117	if (id < 0) {
	118	ret = id;
	119	goto noid;
	120	}
	121
	122	pdev = platform_device_alloc("ds2781-battery", id);
	123	if (!pdev) {
	124	ret = -ENOMEM;
	125	goto pdev_alloc_failed;
	126	}
	127	pdev->dev.parent = &sl->dev;
	128
	129	ret = platform_device_add(pdev);
	130	if (ret)
	131	goto pdev_add_failed;
	132
	133	ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
	134	if (ret)
	135	goto bin_attr_failed;
	136
	137	dev_set_drvdata(&sl->dev, pdev);
	138
	139	return 0;
	140
	141	bin_attr_failed:
	142	pdev_add_failed:
	143	platform_device_unregister(pdev);
	144	pdev_alloc_failed:
	145	ida_simple_remove(&bat_ida, id);
	146	noid:
	147	return ret;
	148	}
	149
150	static void w1_ds2781_remove_slave(struct w1_slave *sl)
151	{
152	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
153	int id = pdev->id;
154
155	platform_device_unregister(pdev);
156	ida_simple_remove(&bat_ida, id);
157	sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2781_bin_attr);
158	}
159
160	static struct w1_family_ops w1_ds2781_fops = {
161	.add_slave = w1_ds2781_add_slave,
162	.remove_slave = w1_ds2781_remove_slave,
163	};
164
165	static struct w1_family w1_ds2781_family = {
166	.fid = W1_FAMILY_DS2781,
167	.fops = &w1_ds2781_fops,
168	};
169
170	static int __init w1_ds2781_init(void)
171	{
172	ida_init(&bat_ida);
173	return w1_register_family(&w1_ds2781_family);
174	}
175
176	static void __exit w1_ds2781_exit(void)
177	{
178	w1_unregister_family(&w1_ds2781_family);
179	ida_destroy(&bat_ida);
180	}
181
182	module_init(w1_ds2781_init);
183	module_exit(w1_ds2781_exit);
184
185	MODULE_LICENSE("GPL");
186	MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
187	MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");