/*
 * 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 "../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_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_LICENSE("GPL");
MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));
n><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-18 11:13:41 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-18 11:13:41 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>ca92e6c7e6329029d7188487a5c32e86ef471977</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>704fb5c2ca533cdb569826522eed0dbbcf31f316</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>sound/soc</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc?id=0b75f821ec8be459dd4dec77be39595d989d77ac'>0b75f821ec8be459dd4dec77be39595d989d77ac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc?id=ca92e6c7e6329029d7188487a5c32e86ef471977&amp;id2=0b75f821ec8be459dd4dec77be39595d989d77ac'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc?id=4205e4786d0b9fc3b4fec7b1910cf645a0468307'>4205e4786d0b9fc3b4fec7b1910cf645a0468307</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc?id=ca92e6c7e6329029d7188487a5c32e86ef471977&amp;id2=4205e4786d0b9fc3b4fec7b1910cf645a0468307'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip</div><div class='commit-msg'>Pull SMP hotplug update from Thomas Gleixner:
 "This contains a trivial typo fix and an extension to the core code for
  dynamically allocating states in the prepare stage.

  The extension is necessary right now because we need a proper way to
  unbreak LTTNG, which iscurrently non functional due to the removal of
  the notifiers. Surely it's out of tree, but it's widely used by
  distros.

  The simple solution would have been to reserve a state for LTTNG, but
  I'm not fond about unused crap in the kernel and the dynamic range,
  which we admittedly should have done right away, allows us to remove
  quite some of the hardcoded states, i.e. those which have no ordering
  requirements. So doing the right thing now is better than having an
  smaller intermediate solution which needs to be reworked anyway"

* 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  cpu/hotplug: Provide dynamic range for prepare stage
  perf/x86/amd/ibs: Fix typo after cleanup state names in cpu/hotplug
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>Diffstat</a> (limited to 'sound/soc')</div><table summary='diffstat' class='diffstat'>