[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/w1.h>

#include "w1_ds2781.h"

#define W1_FAMILY_DS2781	0x3D

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_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
MODULE_LICENSE("GPL");
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	20
de0d6dbd AD	21	#include <linux/w1.h>
de0d6dbd AD	22
fef37e9a RS	23	#include "w1_ds2781.h"
fef37e9a RS	24
de0d6dbd AD	25	#define W1_FAMILY_DS2781 0x3D
de0d6dbd AD	26
fef37e9a RS	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
eefafb79 GKH	90	static ssize_t w1_slave_read(struct file filp, struct kobject kobj,
	91	struct bin_attribute bin_attr, char buf,
	92	loff_t off, size_t count)
fef37e9a RS	93	{
	94	struct device *dev = container_of(kobj, struct device, kobj);
	95	return w1_ds2781_io(dev, buf, off, count, 0);
	96	}
	97
eefafb79 GKH	98	static BIN_ATTR_RO(w1_slave, DS2781_DATA_SIZE);
	99
	100	static struct bin_attribute *w1_ds2781_bin_attrs[] = {
	101	&bin_attr_w1_slave,
	102	NULL,
	103	};
	104
	105	static const struct attribute_group w1_ds2781_group = {
	106	.bin_attrs = w1_ds2781_bin_attrs,
	107	};
	108
	109	static const struct attribute_group *w1_ds2781_groups[] = {
	110	&w1_ds2781_group,
	111	NULL,
fef37e9a RS	112	};
fef37e9a RS	113
fef37e9a RS	114	static int w1_ds2781_add_slave(struct w1_slave *sl)
	115	{
	116	int ret;
fef37e9a RS	117	struct platform_device *pdev;
fef37e9a RS	118
098f9fb0 AD	119	pdev = platform_device_alloc("ds2781-battery", PLATFORM_DEVID_AUTO);
	120	if (!pdev)
	121	return -ENOMEM;
fef37e9a RS	122	pdev->dev.parent = &sl->dev;
	123
	124	ret = platform_device_add(pdev);
	125	if (ret)
	126	goto pdev_add_failed;
	127
fef37e9a RS	128	dev_set_drvdata(&sl->dev, pdev);
	129
	130	return 0;
	131
fef37e9a	132	pdev_add_failed:
c28d6f2d	133	platform_device_put(pdev);
098f9fb0	134
fef37e9a RS	135	return ret;
	136	}
	137
	138	static void w1_ds2781_remove_slave(struct w1_slave *sl)
	139	{
	140	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
fef37e9a RS	141
fef37e9a RS	142	platform_device_unregister(pdev);
fef37e9a RS	143	}
	144
	145	static struct w1_family_ops w1_ds2781_fops = {
	146	.add_slave = w1_ds2781_add_slave,
	147	.remove_slave = w1_ds2781_remove_slave,
eefafb79	148	.groups = w1_ds2781_groups,
fef37e9a RS	149	};
	150
	151	static struct w1_family w1_ds2781_family = {
	152	.fid = W1_FAMILY_DS2781,
	153	.fops = &w1_ds2781_fops,
	154	};
939fc832	155	module_w1_family(w1_ds2781_family);
fef37e9a	156
fef37e9a RS	157	MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
fef37e9a RS	158	MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
50fa2951	159	MODULE_LICENSE("GPL");
8d7bda51	160	MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));