/*
 * rfkill-regulator.c - Regulator consumer driver for rfkill
 *
 * Copyright (C) 2009  Guiming Zhuo <gmzhuo@gmail.com>
 * Copyright (C) 2011  Antonio Ospite <ospite@studenti.unina.it>
 *
 * Implementation inspired by leds-regulator 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/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/rfkill.h>
#include <linux/rfkill-regulator.h>

struct rfkill_regulator_data {
	struct rfkill *rf_kill;
	bool reg_enabled;

	struct regulator *vcc;
};

static int rfkill_regulator_set_block(void *data, bool blocked)
{
	struct rfkill_regulator_data *rfkill_data = data;
	int ret = 0;

	pr_debug("%s: blocked: %d\n", __func__, blocked);

	if (blocked) {
		if (rfkill_data->reg_enabled) {
			regulator_disable(rfkill_data->vcc);
			rfkill_data->reg_enabled = false;
		}
	} else {
		if (!rfkill_data->reg_enabled) {
			ret = regulator_enable(rfkill_data->vcc);
			if (!ret)
				rfkill_data->reg_enabled = true;
		}
	}

	pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
		regulator_is_enabled(rfkill_data->vcc));

	return ret;
}

static struct rfkill_ops rfkill_regulator_ops = {
	.set_block = rfkill_regulator_set_block,
};

static int rfkill_regulator_probe(struct platform_device *pdev)
{
	struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
	struct rfkill_regulator_data *rfkill_data;
	struct regulator *vcc;
	struct rfkill *rf_kill;
	int ret = 0;

	if (pdata == NULL) {
		dev_err(&pdev->dev, "no platform data\n");
		return -ENODEV;
	}

	if (pdata->name == NULL || pdata->type == 0) {
		dev_err(&pdev->dev, "invalid name or type in platform data\n");
		return -EINVAL;
	}

	vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
	if (IS_ERR(vcc)) {
		dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
		ret = PTR_ERR(vcc);
		goto out;
	}

	rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
	if (rfkill_data == NULL) {
		ret = -ENOMEM;
		goto err_data_alloc;
	}

	rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
				pdata->type,
				&rfkill_regulator_ops, rfkill_data);
	if (rf_kill == NULL) {
		ret = -ENOMEM;
		goto err_rfkill_alloc;
	}

	if (regulator_is_enabled(vcc)) {
		dev_dbg(&pdev->dev, "Regulator already enabled\n");
		rfkill_data->reg_enabled = true;
	}
	rfkill_data->vcc = vcc;
	rfkill_data->rf_kill = rf_kill;

	ret = rfkill_register(rf_kill);
	if (ret) {
		dev_err(&pdev->dev, "Cannot register rfkill device\n");
		goto err_rfkill_register;
	}

	platform_set_drvdata(pdev, rfkill_data);
	dev_info(&pdev->dev, "%s initialized\n", pdata->name);

	return 0;

err_rfkill_register:
	rfkill_destroy(rf_kill);
err_rfkill_alloc:
	kfree(rfkill_data);
err_data_alloc:
	regulator_put(vcc);
out:
	return ret;
}

static int rfkill_regulator_remove(struct platform_device *pdev)
{
	struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
	struct rfkill *rf_kill = rfkill_data->rf_kill;

	rfkill_unregister(rf_kill);
	rfkill_destroy(rf_kill);
	regulator_put(rfkill_data->vcc);
	kfree(rfkill_data);

	return 0;
}

static struct platform_driver rfkill_regulator_driver = {
	.probe = rfkill_regulator_probe,
	.remove = rfkill_regulator_remove,
	.driver = {
		.name = "rfkill-regulator",
	},
};

module_platform_driver(rfkill_regulator_driver);

MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rfkill-regulator");
value='20'>20</option><option value='25'>25</option><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>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/xfs_symlink.h?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/patch/fs/xfs/xfs_symlink.h?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>363a4e34d199178769b7e7eeb26ea2620a55847b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/fs/xfs/xfs_symlink.h?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>fs/xfs/xfs_symlink.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/fs/xfs/xfs_symlink.h?id=4d191b1b63c209e37bf27938ef365244d3c41084'>4d191b1b63c209e37bf27938ef365244d3c41084</a> (<a href='/cgit.cgi/linux/net-next.git/diff/fs/xfs/xfs_symlink.h?id=030305d69fc6963c16003f50d7e8d74b02d0a143&amp;id2=4d191b1b63c209e37bf27938ef365244d3c41084'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies</div><div class='commit-msg'>In a struct pcie_link_state, link-&gt;root points to the pcie_link_state of
the root of the PCIe hierarchy.  For the topmost link, this points to
itself (link-&gt;root = link).  For others, we copy the pointer from the
parent (link-&gt;root = link-&gt;parent-&gt;root).

Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link-&gt;parent-&gt;root,
there was no parent, and we dereferenced a NULL pointer:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [&lt;ffffffff9e424350&gt;] pcie_aspm_init_link_state+0x170/0x820

Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link-&gt;root for these devices should also point to
itself.

Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. &lt;jnair@caviumnetworks.com&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;
CC: stable@vger.kernel.org	# v4.2+</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>Diffstat</a> (limited to 'fs/xfs/xfs_symlink.h')</div><table summary='diffstat' class='diffstat'>