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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * 1-Wire implementation for the ds2780 chip
 *
 * Copyright (C) 2010 Indesign, LLC
 *
 * Author: Clifton Barnes <cabarnes@indesign-llc.com>
 *
 * Based on w1-ds2760 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/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 <cabarnes@indesign-llc.com>");
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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
275ac746 CB	2	/*
	3	* 1-Wire implementation for the ds2780 chip
	4	*
	5	* Copyright (C) 2010 Indesign, LLC
	6	*
	7	* Author: Clifton Barnes <cabarnes@indesign-llc.com>
	8	*
	9	* Based on w1-ds2760 driver
275ac746 CB	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/device.h>
	15	#include <linux/types.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/mutex.h>
	18	#include <linux/idr.h>
	19
de0d6dbd AD	20	#include <linux/w1.h>
de0d6dbd AD	21
275ac746 CB	22	#include "w1_ds2780.h"
275ac746 CB	23
de0d6dbd AD	24	#define W1_FAMILY_DS2780 0x32
de0d6dbd AD	25
9fe678fa CB	26	static int w1_ds2780_do_io(struct device dev, char buf, int addr,
9fe678fa CB	27	size_t count, int io)
275ac746 CB	28	{
	29	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	30
9fe678fa CB	31	if (addr > DS2780_DATA_SIZE \|\| addr < 0)
9fe678fa CB	32	return 0;
275ac746	33
275ac746 CB	34	count = min_t(int, count, DS2780_DATA_SIZE - addr);
	35
	36	if (w1_reset_select_slave(sl) == 0) {
	37	if (io) {
	38	w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
	39	w1_write_8(sl->master, addr);
	40	w1_write_block(sl->master, buf, count);
275ac746 CB	41	} else {
	42	w1_write_8(sl->master, W1_DS2780_READ_DATA);
	43	w1_write_8(sl->master, addr);
	44	count = w1_read_block(sl->master, buf, count);
	45	}
	46	}
	47
9fe678fa CB	48	return count;
	49	}
	50
	51	int w1_ds2780_io(struct device dev, char buf, int addr, size_t count,
	52	int io)
	53	{
	54	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	55	int ret;
	56
	57	if (!dev)
	58	return -ENODEV;
	59
b02f8bed	60	mutex_lock(&sl->master->bus_mutex);
9fe678fa CB	61
	62	ret = w1_ds2780_do_io(dev, buf, addr, count, io);
	63
b02f8bed	64	mutex_unlock(&sl->master->bus_mutex);
275ac746	65
9fe678fa	66	return ret;
275ac746 CB	67	}
	68	EXPORT_SYMBOL(w1_ds2780_io);
	69
	70	int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
	71	{
	72	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
	73
	74	if (!dev)
	75	return -EINVAL;
	76
b02f8bed	77	mutex_lock(&sl->master->bus_mutex);
275ac746 CB	78
	79	if (w1_reset_select_slave(sl) == 0) {
	80	w1_write_8(sl->master, cmd);
	81	w1_write_8(sl->master, addr);
	82	}
	83
b02f8bed	84	mutex_unlock(&sl->master->bus_mutex);
275ac746 CB	85	return 0;
	86	}
	87	EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
	88
9365261d GKH	89	static ssize_t w1_slave_read(struct file filp, struct kobject kobj,
	90	struct bin_attribute bin_attr, char buf,
	91	loff_t off, size_t count)
275ac746 CB	92	{
	93	struct device *dev = container_of(kobj, struct device, kobj);
	94	return w1_ds2780_io(dev, buf, off, count, 0);
	95	}
	96
9365261d GKH	97	static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE);
	98
	99	static struct bin_attribute *w1_ds2780_bin_attrs[] = {
	100	&bin_attr_w1_slave,
	101	NULL,
	102	};
	103
	104	static const struct attribute_group w1_ds2780_group = {
	105	.bin_attrs = w1_ds2780_bin_attrs,
	106	};
	107
	108	static const struct attribute_group *w1_ds2780_groups[] = {
	109	&w1_ds2780_group,
	110	NULL,
275ac746 CB	111	};
275ac746 CB	112
275ac746 CB	113	static int w1_ds2780_add_slave(struct w1_slave *sl)
	114	{
	115	int ret;
275ac746 CB	116	struct platform_device *pdev;
275ac746 CB	117
098f9fb0 AD	118	pdev = platform_device_alloc("ds2780-battery", PLATFORM_DEVID_AUTO);
	119	if (!pdev)
	120	return -ENOMEM;
275ac746 CB	121	pdev->dev.parent = &sl->dev;
	122
	123	ret = platform_device_add(pdev);
	124	if (ret)
	125	goto pdev_add_failed;
	126
275ac746 CB	127	dev_set_drvdata(&sl->dev, pdev);
	128
	129	return 0;
	130
275ac746	131	pdev_add_failed:
c5cfedf2	132	platform_device_put(pdev);
098f9fb0	133
275ac746 CB	134	return ret;
	135	}
	136
	137	static void w1_ds2780_remove_slave(struct w1_slave *sl)
	138	{
	139	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
275ac746 CB	140
275ac746 CB	141	platform_device_unregister(pdev);
275ac746 CB	142	}
	143
	144	static struct w1_family_ops w1_ds2780_fops = {
	145	.add_slave = w1_ds2780_add_slave,
	146	.remove_slave = w1_ds2780_remove_slave,
9365261d	147	.groups = w1_ds2780_groups,
275ac746 CB	148	};
	149
	150	static struct w1_family w1_ds2780_family = {
	151	.fid = W1_FAMILY_DS2780,
	152	.fops = &w1_ds2780_fops,
	153	};
939fc832	154	module_w1_family(w1_ds2780_family);
275ac746	155
275ac746 CB	156	MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
275ac746 CB	157	MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
50fa2951	158	MODULE_LICENSE("GPL");
8d7bda51	159	MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));