[mirror_ubuntu-hirsute-kernel.git] / drivers / w1 / slaves / w1_ds2781.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 1-Wire implementation for the ds2781 chip
 *
 * Author: Renata Sayakhova <renata@oktetlabs.ru>
 *
 * Based on w1-ds2780 driver
 */

#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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
fef37e9a RS	2	/*
	3	* 1-Wire implementation for the ds2781 chip
	4	*
	5	* Author: Renata Sayakhova <renata@oktetlabs.ru>
	6	*
	7	* Based on w1-ds2780 driver
fef37e9a RS	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/device.h>
	13	#include <linux/types.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/mutex.h>
fef37e9a	16
de0d6dbd AD	17	#include <linux/w1.h>
de0d6dbd AD	18
fef37e9a RS	19	#include "w1_ds2781.h"
fef37e9a RS	20
de0d6dbd AD	21	#define W1_FAMILY_DS2781 0x3D
de0d6dbd AD	22
fef37e9a RS	23	static int w1_ds2781_do_io(struct device dev, char buf, int addr,
	24	size_t count, int io)
	25	{
	26	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	27
	28	if (addr > DS2781_DATA_SIZE \|\| addr < 0)
	29	return 0;
	30
	31	count = min_t(int, count, DS2781_DATA_SIZE - addr);
	32
	33	if (w1_reset_select_slave(sl) == 0) {
	34	if (io) {
	35	w1_write_8(sl->master, W1_DS2781_WRITE_DATA);
	36	w1_write_8(sl->master, addr);
	37	w1_write_block(sl->master, buf, count);
	38	} else {
	39	w1_write_8(sl->master, W1_DS2781_READ_DATA);
	40	w1_write_8(sl->master, addr);
	41	count = w1_read_block(sl->master, buf, count);
	42	}
	43	}
	44
	45	return count;
	46	}
	47
	48	int w1_ds2781_io(struct device dev, char buf, int addr, size_t count,
	49	int io)
	50	{
	51	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	52	int ret;
	53
	54	if (!dev)
	55	return -ENODEV;
	56
b02f8bed	57	mutex_lock(&sl->master->bus_mutex);
fef37e9a RS	58
	59	ret = w1_ds2781_do_io(dev, buf, addr, count, io);
	60
b02f8bed	61	mutex_unlock(&sl->master->bus_mutex);
fef37e9a RS	62
	63	return ret;
	64	}
	65	EXPORT_SYMBOL(w1_ds2781_io);
	66
fef37e9a RS	67	int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
	68	{
	69	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	70
	71	if (!dev)
	72	return -EINVAL;
	73
b02f8bed	74	mutex_lock(&sl->master->bus_mutex);
fef37e9a RS	75
	76	if (w1_reset_select_slave(sl) == 0) {
	77	w1_write_8(sl->master, cmd);
	78	w1_write_8(sl->master, addr);
	79	}
	80
b02f8bed	81	mutex_unlock(&sl->master->bus_mutex);
fef37e9a RS	82	return 0;
	83	}
	84	EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);
	85
eefafb79 GKH	86	static ssize_t w1_slave_read(struct file filp, struct kobject kobj,
	87	struct bin_attribute bin_attr, char buf,
	88	loff_t off, size_t count)
fef37e9a RS	89	{
	90	struct device *dev = container_of(kobj, struct device, kobj);
	91	return w1_ds2781_io(dev, buf, off, count, 0);
	92	}
	93
eefafb79 GKH	94	static BIN_ATTR_RO(w1_slave, DS2781_DATA_SIZE);
	95
	96	static struct bin_attribute *w1_ds2781_bin_attrs[] = {
	97	&bin_attr_w1_slave,
	98	NULL,
	99	};
	100
	101	static const struct attribute_group w1_ds2781_group = {
	102	.bin_attrs = w1_ds2781_bin_attrs,
	103	};
	104
	105	static const struct attribute_group *w1_ds2781_groups[] = {
	106	&w1_ds2781_group,
	107	NULL,
fef37e9a RS	108	};
fef37e9a RS	109
fef37e9a RS	110	static int w1_ds2781_add_slave(struct w1_slave *sl)
	111	{
	112	int ret;
fef37e9a RS	113	struct platform_device *pdev;
fef37e9a RS	114
098f9fb0 AD	115	pdev = platform_device_alloc("ds2781-battery", PLATFORM_DEVID_AUTO);
	116	if (!pdev)
	117	return -ENOMEM;
fef37e9a RS	118	pdev->dev.parent = &sl->dev;
	119
	120	ret = platform_device_add(pdev);
	121	if (ret)
	122	goto pdev_add_failed;
	123
fef37e9a RS	124	dev_set_drvdata(&sl->dev, pdev);
	125
	126	return 0;
	127
fef37e9a	128	pdev_add_failed:
c28d6f2d	129	platform_device_put(pdev);
098f9fb0	130
fef37e9a RS	131	return ret;
	132	}
	133
	134	static void w1_ds2781_remove_slave(struct w1_slave *sl)
	135	{
	136	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
fef37e9a RS	137
fef37e9a RS	138	platform_device_unregister(pdev);
fef37e9a RS	139	}
	140
	141	static struct w1_family_ops w1_ds2781_fops = {
	142	.add_slave = w1_ds2781_add_slave,
	143	.remove_slave = w1_ds2781_remove_slave,
eefafb79	144	.groups = w1_ds2781_groups,
fef37e9a RS	145	};
	146
	147	static struct w1_family w1_ds2781_family = {
	148	.fid = W1_FAMILY_DS2781,
	149	.fops = &w1_ds2781_fops,
	150	};
939fc832	151	module_w1_family(w1_ds2781_family);
fef37e9a	152
fef37e9a RS	153	MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
fef37e9a RS	154	MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
50fa2951	155	MODULE_LICENSE("GPL");
8d7bda51	156	MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));