/*
 * Xsens MT USB driver
 *
 * Copyright (C) 2013 Xsens <info@xsens.com>
 *
 *  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/tty.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
#include <linux/uaccess.h>

#define XSENS_VID 0x2639

#define MTi_10_IMU_PID		0x0001
#define MTi_20_VRU_PID		0x0002
#define MTi_30_AHRS_PID		0x0003

#define MTi_100_IMU_PID		0x0011
#define MTi_200_VRU_PID		0x0012
#define MTi_300_AHRS_PID	0x0013

#define MTi_G_700_GPS_INS_PID	0x0017

static const struct usb_device_id id_table[] = {
	{ USB_DEVICE(XSENS_VID, MTi_10_IMU_PID) },
	{ USB_DEVICE(XSENS_VID, MTi_20_VRU_PID) },
	{ USB_DEVICE(XSENS_VID, MTi_30_AHRS_PID) },

	{ USB_DEVICE(XSENS_VID, MTi_100_IMU_PID) },
	{ USB_DEVICE(XSENS_VID, MTi_200_VRU_PID) },
	{ USB_DEVICE(XSENS_VID, MTi_300_AHRS_PID) },

	{ USB_DEVICE(XSENS_VID, MTi_G_700_GPS_INS_PID) },
	{ },
};
MODULE_DEVICE_TABLE(usb, id_table);

static int xsens_mt_probe(struct usb_serial *serial,
					const struct usb_device_id *id)
{
	if (serial->interface->cur_altsetting->desc.bInterfaceNumber == 1)
		return 0;

	return -ENODEV;
}

static struct usb_serial_driver xsens_mt_device = {
	.driver = {
		.owner = THIS_MODULE,
		.name = "xsens_mt",
	},
	.id_table = id_table,
	.num_ports = 1,

	.probe = xsens_mt_probe,
};

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

module_usb_serial_driver(serial_drivers, id_table);

MODULE_AUTHOR("Frans Klaver <frans.klaver@xsens.com>");
MODULE_DESCRIPTION("USB-serial driver for Xsens motion trackers");
MODULE_LICENSE("GPL");
91287632279c6c9eca3e4ed'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/fs/afs/misc.c?id=a572a1b999489efb591287632279c6c9eca3e4ed'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/fs/afs/misc.c?id=a572a1b999489efb591287632279c6c9eca3e4ed'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/fs/afs/misc.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=a572a1b999489efb591287632279c6c9eca3e4ed'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/fs?id=a572a1b999489efb591287632279c6c9eca3e4ed'>fs</a>/<a href='/cgit.cgi/linux/net-next.git/log/fs/afs?id=a572a1b999489efb591287632279c6c9eca3e4ed'>afs</a>/<a href='/cgit.cgi/linux/net-next.git/log/fs/afs/misc.c?id=a572a1b999489efb591287632279c6c9eca3e4ed'>misc.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/fs/afs/misc.c?id=a572a1b999489efb591287632279c6c9eca3e4ed&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
</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>John Brooks &lt;john@fastquake.com&gt;</td><td class='right'>2017-01-18 21:50:39 +0000</td></tr>
<tr><th>committer</th><td>Jonathan Cameron &lt;jic23@kernel.org&gt;</td><td class='right'>2017-01-22 13:35:40 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/misc?id=5c113b5e0082e90d2e1c7b12e96a7b8cf0623e27'>5c113b5e0082e90d2e1c7b12e96a7b8cf0623e27</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/misc?id=5c113b5e0082e90d2e1c7b12e96a7b8cf0623e27'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=5c113b5e0082e90d2e1c7b12e96a7b8cf0623e27'>caf374a799c6c5f8bdf865d7fc0e936e9685f4ca</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/misc?id=5c113b5e0082e90d2e1c7b12e96a7b8cf0623e27'>drivers/usb/misc</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/misc?id=d1aaf20ee655888c227d5137b7a63551f8d15416'>d1aaf20ee655888c227d5137b7a63551f8d15416</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/misc?id=5c113b5e0082e90d2e1c7b12e96a7b8cf0623e27&amp;id2=d1aaf20ee655888c227d5137b7a63551f8d15416'>diff</a>)</td></tr></table>
<div class='commit-subject'>iio: dht11: Use usleep_range instead of msleep for start signal</div><div class='commit-msg'>The DHT22 (AM2302) datasheet specifies that the LOW start pulse should not
exceed 20ms. However, observations with an oscilloscope of an RPi Model 2B
(rev 1.1) communicating with a DHT22 sensor showed that the driver was
consistently sending start pulses longer than 20ms:

Kernel 4.7.10-v7+ (n=132):
    Minimum pulse length: 20.20ms
    Maximum:              29.84ms
    Mean:                 24.96ms
    StDev:                2.82ms
    Sensor response rate: 100%
    Read success rate:    76%

On kernel 4.8, the start pulse was so long that the sensor would not even
respond 97% of the time:

Kernel 4.8.16-v7+ (n=100):
    Minimum pulse length: 30.4ms
    Maximum:              74.4ms
    Mean:                 39.3ms
    StDev:                10.2ms
    Sensor response rate: 3%
    Read success rate:    3%

The driver would return ETIMEDOUT and write log messages like this:

[   51.430987] dht11 dht11@0: Only 1 signal edges detected
[   66.311019] dht11 dht11@0: Only 0 signal edges detected

Replacing msleep(18) with usleep_range(18000, 20000) made the pulse length
sane again and restored responsiveness:

Kernel 4.8.16-v7+ with usleep_range (n=123):
    Minimum pulse length: 18.16ms
    Maximum:              20.20ms
    Mean:                 19.85ms
    StDev:                0.51ms
    Sensor response rate: 100%
    Read success rate:    84%

Cc: stable@vger.kernel.org
Signed-off-by: John Brooks &lt;john@fastquake.com&gt;
Reviewed-by: Harald Geyer &lt;harald@ccbib.org&gt;
Signed-off-by: Jonathan Cameron &lt;jic23@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=5c113b5e0082e90d2e1c7b12e96a7b8cf0623e27'>Diffstat</a> (limited to 'drivers/usb/misc')</div><table summary='diffstat' class='diffstat'>