/*
 * Copyright (c) 2011 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt)		KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/crc8.h>
#include <linux/printk.h>

/*
 * crc8_populate_msb - fill crc table for given polynomial in reverse bit order.
 *
 * table:	table to be filled.
 * polynomial:	polynomial for which table is to be filled.
 */
void crc8_populate_msb(u8 table[CRC8_TABLE_SIZE], u8 polynomial)
{
	int i, j;
	const u8 msbit = 0x80;
	u8 t = msbit;

	table[0] = 0;

	for (i = 1; i < CRC8_TABLE_SIZE; i *= 2) {
		t = (t << 1) ^ (t & msbit ? polynomial : 0);
		for (j = 0; j < i; j++)
			table[i+j] = table[j] ^ t;
	}
}
EXPORT_SYMBOL(crc8_populate_msb);

/*
 * crc8_populate_lsb - fill crc table for given polynomial in regular bit order.
 *
 * table:	table to be filled.
 * polynomial:	polynomial for which table is to be filled.
 */
void crc8_populate_lsb(u8 table[CRC8_TABLE_SIZE], u8 polynomial)
{
	int i, j;
	u8 t = 1;

	table[0] = 0;

	for (i = (CRC8_TABLE_SIZE >> 1); i; i >>= 1) {
		t = (t >> 1) ^ (t & 1 ? polynomial : 0);
		for (j = 0; j < CRC8_TABLE_SIZE; j += 2*i)
			table[i+j] = table[j] ^ t;
	}
}
EXPORT_SYMBOL(crc8_populate_lsb);

/*
 * crc8 - calculate a crc8 over the given input data.
 *
 * table: crc table used for calculation.
 * pdata: pointer to data buffer.
 * nbytes: number of bytes in data buffer.
 * crc:	previous returned crc8 value.
 */
u8 crc8(const u8 table[CRC8_TABLE_SIZE], u8 *pdata, size_t nbytes, u8 crc)
{
	/* loop over the buffer data */
	while (nbytes-- > 0)
		crc = table[(crc ^ *pdata++) & 0xff];

	return crc;
}
EXPORT_SYMBOL(crc8);

MODULE_DESCRIPTION("CRC8 (by Williams, Ross N.) function");
MODULE_AUTHOR("Broadcom Corporation");
MODULE_LICENSE("Dual BSD/GPL");
c3/ep0.c'>
<input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>dwc3</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/ep0.c?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>ep0.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-10 14:39:08 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-10 14:39:08 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/ep0.c?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>aca9fa0c8d225b1446dbed798b1d2f20e37e52cf</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/dwc3/ep0.c?id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>cf8d9f70ca376665da6b83eaae382ac0218395fc</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/dwc3/ep0.c?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>drivers/usb/dwc3/ep0.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/ep0.c?h=nds-private-remove&amp;id=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>fc6f41ba8b2e705f91324db158c3cc28209a15b1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc3/ep0.c?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf&amp;id2=fc6f41ba8b2e705f91324db158c3cc28209a15b1'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/dwc3/ep0.c?h=nds-private-remove&amp;id=bbb27fc33d44e7b8d96369810654df4ee1837566'>bbb27fc33d44e7b8d96369810654df4ee1837566</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/dwc3/ep0.c?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf&amp;id2=bbb27fc33d44e7b8d96369810654df4ee1837566'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux</div><div class='commit-msg'>Pull i2c bugfixes from Wolfram Sang:
 "Two bugfixes (proper IO mapping and use of mutex) for a driver feature
  we introduced in this cycle"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: piix4: Request the SMBUS semaphore inside the mutex
  i2c: piix4: Fix request_region size
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=aca9fa0c8d225b1446dbed798b1d2f20e37e52cf'>Diffstat</a> (limited to 'drivers/usb/dwc3/ep0.c')</div><table summary='diffstat' class='diffstat'>