/*
 * linux/drivers/video/nvidia/nvidia-i2c.c - nVidia i2c
 *
 * Copyright 2004 Antonino A. Daplas <adaplas @pol.net>
 *
 * Based on rivafb-i2c.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/gfp.h>
#include <linux/pci.h>
#include <linux/fb.h>

#include <asm/io.h>

#include "nv_type.h"
#include "nv_local.h"
#include "nv_proto.h"

#include "../edid.h"

static void nvidia_gpio_setscl(void *data, int state)
{
	struct nvidia_i2c_chan *chan = data;
	struct nvidia_par *par = chan->par;
	u32 val;

	val = NVReadCrtc(par, chan->ddc_base + 1) & 0xf0;

	if (state)
		val |= 0x20;
	else
		val &= ~0x20;

	NVWriteCrtc(par, chan->ddc_base + 1, val | 0x01);
}

static void nvidia_gpio_setsda(void *data, int state)
{
	struct nvidia_i2c_chan *chan = data;
	struct nvidia_par *par = chan->par;
	u32 val;

	val = NVReadCrtc(par, chan->ddc_base + 1) & 0xf0;

	if (state)
		val |= 0x10;
	else
		val &= ~0x10;

	NVWriteCrtc(par, chan->ddc_base + 1, val | 0x01);
}

static int nvidia_gpio_getscl(void *data)
{
	struct nvidia_i2c_chan *chan = data;
	struct nvidia_par *par = chan->par;
	u32 val = 0;

	if (NVReadCrtc(par, chan->ddc_base) & 0x04)
		val = 1;

	return val;
}

static int nvidia_gpio_getsda(void *data)
{
	struct nvidia_i2c_chan *chan = data;
	struct nvidia_par *par = chan->par;
	u32 val = 0;

	if (NVReadCrtc(par, chan->ddc_base) & 0x08)
		val = 1;

	return val;
}

static int nvidia_setup_i2c_bus(struct nvidia_i2c_chan *chan, const char *name,
				unsigned int i2c_class)
{
	int rc;

	strcpy(chan->adapter.name, name);
	chan->adapter.owner = THIS_MODULE;
	chan->adapter.class = i2c_class;
	chan->adapter.algo_data = &chan->algo;
	chan->adapter.dev.parent = &chan->par->pci_dev->dev;
	chan->algo.setsda = nvidia_gpio_setsda;
	chan->algo.setscl = nvidia_gpio_setscl;
	chan->algo.getsda = nvidia_gpio_getsda;
	chan->algo.getscl = nvidia_gpio_getscl;
	chan->algo.udelay = 40;
	chan->algo.timeout = msecs_to_jiffies(2);
	chan->algo.data = chan;

	i2c_set_adapdata(&chan->adapter, chan);

	/* Raise SCL and SDA */
	nvidia_gpio_setsda(chan, 1);
	nvidia_gpio_setscl(chan, 1);
	udelay(20);

	rc = i2c_bit_add_bus(&chan->adapter);
	if (rc == 0)
		dev_dbg(&chan->par->pci_dev->dev,
			"I2C bus %s registered.\n", name);
	else {
		dev_warn(&chan->par->pci_dev->dev,
			 "Failed to register I2C bus %s.\n", name);
		chan->par = NULL;
	}

	return rc;
}

void nvidia_create_i2c_busses(struct nvidia_par *par)
{
	par->chan[0].par = par;
	par->chan[1].par = par;
	par->chan[2].par = par;

	par->chan[0].ddc_base = (par->reverse_i2c) ? 0x36 : 0x3e;
 	nvidia_setup_i2c_bus(&par->chan[0], "nvidia #0",
			     (par->reverse_i2c) ? I2C_CLASS_HWMON : 0);

	par->chan[1].ddc_base = (par->reverse_i2c) ? 0x3e : 0x36;
 	nvidia_setup_i2c_bus(&par->chan[1], "nvidia #1",
			     (par->reverse_i2c) ? 0 : I2C_CLASS_HWMON);

	par->chan[2].ddc_base = 0x50;
 	nvidia_setup_i2c_bus(&par->chan[2], "nvidia #2", 0);
}

void nvidia_delete_i2c_busses(struct nvidia_par *par)
{
	int i;

	for (i = 0; i < 3; i++) {
		if (!par->chan[i].par)
			continue;
		i2c_del_adapter(&par->chan[i].adapter);
		par->chan[i].par = NULL;
	}
}

int nvidia_probe_i2c_connector(struct fb_info *info, int conn, u8 **out_edid)
{
	struct nvidia_par *par = info->par;
	u8 *edid = NULL;

	if (par->chan[conn - 1].par)
		edid = fb_ddc_read(&par->chan[conn - 1].adapter);

	if (!edid && conn == 1) {
		/* try to get from firmware */
		const u8 *e = fb_firmware_edid(info->device);

		if (e != NULL)
			edid = kmemdup(e, EDID_LENGTH, GFP_KERNEL);
	}

	*out_edid = edid;

	return (edid) ? 0 : 1;
}
2e380d0544f1e7e3249d7bbc45979&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
'15'>15</option><option 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/drivers/usb/host/ehci-mv.c?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/host/ehci-mv.c?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/drivers/usb/host/ehci-mv.c?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>drivers/usb/host/ehci-mv.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/ehci-mv.c?id=4d191b1b63c209e37bf27938ef365244d3c41084'>4d191b1b63c209e37bf27938ef365244d3c41084</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/ehci-mv.c?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 'drivers/usb/host/ehci-mv.c')</div><table summary='diffstat' class='diffstat'>