/*
 * net/sched/em_text.c	Textsearch ematch
 *
 *		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.
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/textsearch.h>
#include <linux/tc_ematch/tc_em_text.h>
#include <net/pkt_cls.h>

struct text_match {
	u16			from_offset;
	u16			to_offset;
	u8			from_layer;
	u8			to_layer;
	struct ts_config	*config;
};

#define EM_TEXT_PRIV(m) ((struct text_match *) (m)->data)

static int em_text_match(struct sk_buff *skb, struct tcf_ematch *m,
			 struct tcf_pkt_info *info)
{
	struct text_match *tm = EM_TEXT_PRIV(m);
	int from, to;

	from = tcf_get_base_ptr(skb, tm->from_layer) - skb->data;
	from += tm->from_offset;

	to = tcf_get_base_ptr(skb, tm->to_layer) - skb->data;
	to += tm->to_offset;

	return skb_find_text(skb, from, to, tm->config) != UINT_MAX;
}

static int em_text_change(struct net *net, void *data, int len,
			  struct tcf_ematch *m)
{
	struct text_match *tm;
	struct tcf_em_text *conf = data;
	struct ts_config *ts_conf;
	int flags = 0;

	if (len < sizeof(*conf) || len < (sizeof(*conf) + conf->pattern_len))
		return -EINVAL;

	if (conf->from_layer > conf->to_layer)
		return -EINVAL;

	if (conf->from_layer == conf->to_layer &&
	    conf->from_offset > conf->to_offset)
		return -EINVAL;

retry:
	ts_conf = textsearch_prepare(conf->algo, (u8 *) conf + sizeof(*conf),
				     conf->pattern_len, GFP_KERNEL, flags);

	if (flags & TS_AUTOLOAD)
		rtnl_lock();

	if (IS_ERR(ts_conf)) {
		if (PTR_ERR(ts_conf) == -ENOENT && !(flags & TS_AUTOLOAD)) {
			rtnl_unlock();
			flags |= TS_AUTOLOAD;
			goto retry;
		} else
			return PTR_ERR(ts_conf);
	} else if (flags & TS_AUTOLOAD) {
		textsearch_destroy(ts_conf);
		return -EAGAIN;
	}

	tm = kmalloc(sizeof(*tm), GFP_KERNEL);
	if (tm == NULL) {
		textsearch_destroy(ts_conf);
		return -ENOBUFS;
	}

	tm->from_offset = conf->from_offset;
	tm->to_offset   = conf->to_offset;
	tm->from_layer  = conf->from_layer;
	tm->to_layer    = conf->to_layer;
	tm->config      = ts_conf;

	m->datalen = sizeof(*tm);
	m->data = (unsigned long) tm;

	return 0;
}

static void em_text_destroy(struct tcf_ematch *m)
{
	if (EM_TEXT_PRIV(m) && EM_TEXT_PRIV(m)->config)
		textsearch_destroy(EM_TEXT_PRIV(m)->config);
}

static int em_text_dump(struct sk_buff *skb, struct tcf_ematch *m)
{
	struct text_match *tm = EM_TEXT_PRIV(m);
	struct tcf_em_text conf;

	strncpy(conf.algo, tm->config->ops->name, sizeof(conf.algo) - 1);
	conf.from_offset = tm->from_offset;
	conf.to_offset = tm->to_offset;
	conf.from_layer = tm->from_layer;
	conf.to_layer = tm->to_layer;
	conf.pattern_len = textsearch_get_pattern_len(tm->config);
	conf.pad = 0;

	if (nla_put_nohdr(skb, sizeof(conf), &conf) < 0)
		goto nla_put_failure;
	if (nla_append(skb, conf.pattern_len,
		       textsearch_get_pattern(tm->config)) < 0)
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

static struct tcf_ematch_ops em_text_ops = {
	.kind	  = TCF_EM_TEXT,
	.change	  = em_text_change,
	.match	  = em_text_match,
	.destroy  = em_text_destroy,
	.dump	  = em_text_dump,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_text_ops.link)
};

static int __init init_em_text(void)
{
	return tcf_em_register(&em_text_ops);
}

static void __exit exit_em_text(void)
{
	tcf_em_unregister(&em_text_ops);
}

MODULE_LICENSE("GPL");

module_init(init_em_text);
module_exit(exit_em_text);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_TEXT);
nchange='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>Chen-Yu Tsai &lt;wens@csie.org&gt;</td><td class='right'>2016-11-11 11:12:43 +0800</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-11-11 15:34:45 +0000</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/input/linux-event-codes.h?id=618c808968852609d2d9f0e5cfc351a4807ef8d0'>618c808968852609d2d9f0e5cfc351a4807ef8d0</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/dt-bindings/input/linux-event-codes.h?id=618c808968852609d2d9f0e5cfc351a4807ef8d0'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=618c808968852609d2d9f0e5cfc351a4807ef8d0'>01a8d928c06fe7bef488f55bade6ba37b958bb5f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings/input/linux-event-codes.h?id=618c808968852609d2d9f0e5cfc351a4807ef8d0'>include/dt-bindings/input/linux-event-codes.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/input/linux-event-codes.h?id=1001354ca34179f3db924eb66672442a173147dc'>1001354ca34179f3db924eb66672442a173147dc</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/input/linux-event-codes.h?id=618c808968852609d2d9f0e5cfc351a4807ef8d0&amp;id2=1001354ca34179f3db924eb66672442a173147dc'>diff</a>)</td></tr></table>
<div class='commit-subject'>regulator: axp20x: Fix axp809 ldo_io registration error on cold boot</div><div class='commit-msg'>The maximum supported voltage for ldo_io# is 3.3V, but on cold boot
the selector comes up at 0x1f, which maps to 3.8V. This was previously
corrected by Allwinner's U-boot, which set all regulators on the PMICs
to some pre-configured voltage. With recent progress in U-boot SPL
support, this is no longer the case. In any case we should handle
this quirk in the kernel driver as well.

This invalid setting causes _regulator_get_voltage() to fail with -EINVAL
which causes regulator registration to fail when constrains are used:

[    1.054181] vcc-pg: failed to get the current voltage(-22)
[    1.059670] axp20x-regulator axp20x-regulator.0: Failed to register ldo_io0
[    1.069749] axp20x-regulator: probe of axp20x-regulator.0 failed with error -22

This commits makes the axp20x regulator driver accept the 0x1f register
value, fixing this.

The datasheet does not guarantee reliable operation above 3.3V, so on
boards where this regulator is used the regulator-max-microvolt setting
must be 3.3V or less.

This is essentially the same as the commit f40d4896bf32 ("regulator:
axp20x: Fix axp22x ldo_io registration error on cold boot") for AXP22x
PMICs.

Fixes: a51f9f4622a3 ("regulator: axp20x: support AXP809 variant")
Signed-off-by: Chen-Yu Tsai &lt;wens@csie.org&gt;
Signed-off-by: Mark Brown &lt;broonie@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=618c808968852609d2d9f0e5cfc351a4807ef8d0'>Diffstat</a> (limited to 'include/dt-bindings/input/linux-event-codes.h')</div><table summary='diffstat' class='diffstat'>