/*
 * USB Wishbone-Serial adapter driver
 *
 * Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@gsi.de>
 * Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>

#define GSI_VENDOR_OPENCLOSE 0xB0

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) },
	{ },
};
MODULE_DEVICE_TABLE(usb, id_table);

/*
 * Etherbone must be told that a new stream has begun before data arrives.
 * This is necessary to restart the negotiation of Wishbone bus parameters.
 * Similarly, when the stream ends, Etherbone must be told so that the cycle
 * line can be driven low in the case that userspace failed to do so.
 */
static int usb_gsi_openclose(struct usb_serial_port *port, int value)
{
	struct usb_device *dev = port->serial->dev;

	return usb_control_msg(
		dev,
		usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */
		GSI_VENDOR_OPENCLOSE,
		USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
		value, /* wValue = device is open(1) or closed(0) */
		port->serial->interface->cur_altsetting->desc.bInterfaceNumber,
		NULL, 0,  /* There is no data stage */
		5000); /* Timeout till operation fails */
}

static int wishbone_serial_open(struct tty_struct *tty,
				struct usb_serial_port *port)
{
	int retval;

	retval = usb_gsi_openclose(port, 1);
	if (retval) {
		dev_err(&port->serial->dev->dev,
		       "Could not mark device as open (%d)\n",
		       retval);
		return retval;
	}

	retval = usb_serial_generic_open(tty, port);
	if (retval)
		usb_gsi_openclose(port, 0);

	return retval;
}

static void wishbone_serial_close(struct usb_serial_port *port)
{
	usb_serial_generic_close(port);
	usb_gsi_openclose(port, 0);
}

static struct usb_serial_driver wishbone_serial_device = {
	.driver = {
		.owner =	THIS_MODULE,
		.name =		"wishbone_serial",
	},
	.id_table =		id_table,
	.num_ports =		1,
	.open =			&wishbone_serial_open,
	.close =		&wishbone_serial_close,
};

static struct usb_serial_driver * const serial_drivers[] = {
	&wishbone_serial_device, NULL
};

module_usb_serial_driver(serial_drivers, id_table);

MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@gsi.de>");
MODULE_DESCRIPTION("USB Wishbone-Serial adapter");
MODULE_LICENSE("GPL");
f='/cgit.cgi/linux/net-next.git/commit/?id=54791b276b4000b307339f269d3bf7db877d536f'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound?id=54791b276b4000b307339f269d3bf7db877d536f'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc?id=54791b276b4000b307339f269d3bf7db877d536f'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/ux500?id=54791b276b4000b307339f269d3bf7db877d536f'>ux500</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='54791b276b4000b307339f269d3bf7db877d536f'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='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>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 14:28:22 -0800</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 14:28:22 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/ux500?id=54791b276b4000b307339f269d3bf7db877d536f'>54791b276b4000b307339f269d3bf7db877d536f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/ux500?id=54791b276b4000b307339f269d3bf7db877d536f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=54791b276b4000b307339f269d3bf7db877d536f'>1c2616bd373ce5ea28aac2a53e32f5b5834901ce</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/ux500?id=54791b276b4000b307339f269d3bf7db877d536f'>sound/soc/ux500</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/ux500?id=5d0e7705774dd412a465896d08d59a81a345c1e4'>5d0e7705774dd412a465896d08d59a81a345c1e4</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/ux500?id=54791b276b4000b307339f269d3bf7db877d536f&amp;id2=5d0e7705774dd412a465896d08d59a81a345c1e4'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/ux500?id=047487241ff59374fded8c477f21453681f5995c'>047487241ff59374fded8c477f21453681f5995c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/ux500?id=54791b276b4000b307339f269d3bf7db877d536f&amp;id2=047487241ff59374fded8c477f21453681f5995c'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'sparc64-non-resumable-user-error-recovery'</div><div class='commit-msg'>Liam R. Howlett says:

====================
sparc64: Recover from userspace non-resumable PIO &amp; MEM errors

A non-resumable error from userspace is able to cause a kernel panic or trap
loop due to the setup and handling of the queued traps once in the kernel.
This patch series addresses both of these issues.

The queues are fixed by simply zeroing the memory before use.

PIO errors from userspace will result in a SIGBUS being sent to the user
process.

The MEM errors form userspace will result in a SIGKILL and also cause the
offending pages to be claimed so they are no longer used in future tasks.
SIGKILL is used to ensure that the process does not try to coredump and result
in an attempt to read the memory again from within kernel space.  Although
there is a HV call to scrub the memory (mem_scrub), there is no easy way to
guarantee that the real memory address(es) are not used by other tasks.
Clearing the error with mem_scrub would zero the memory and cause the other
processes to proceed with bad data.

The handling of other non-resumable errors remain unchanged and will cause a
panic.
====================

Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=54791b276b4000b307339f269d3bf7db877d536f'>Diffstat</a> (limited to 'sound/soc/ux500')</div><table summary='diffstat' class='diffstat'>