#ifndef __TRIGGER_H_
#define __TRIGGER_H_ 1

#include "util/debug.h"
#include "asm/bug.h"

/*
 * Use trigger to model operations which need to be executed when
 * an event (a signal, for example) is observed.
 *
 * States and transits:
 *
 *
 *  OFF--(on)--> READY --(hit)--> HIT
 *                 ^               |
 *                 |            (ready)
 *                 |               |
 *                  \_____________/
 *
 * is_hit and is_ready are two key functions to query the state of
 * a trigger. is_hit means the event already happen; is_ready means the
 * trigger is waiting for the event.
 */

struct trigger {
	volatile enum {
		TRIGGER_ERROR		= -2,
		TRIGGER_OFF		= -1,
		TRIGGER_READY		= 0,
		TRIGGER_HIT		= 1,
	} state;
	const char *name;
};

#define TRIGGER_WARN_ONCE(t, exp) \
	WARN_ONCE(t->state != exp, "trigger '%s' state transist error: %d in %s()\n", \
		  t->name, t->state, __func__)

static inline bool trigger_is_available(struct trigger *t)
{
	return t->state >= 0;
}

static inline bool trigger_is_error(struct trigger *t)
{
	return t->state <= TRIGGER_ERROR;
}

static inline void trigger_on(struct trigger *t)
{
	TRIGGER_WARN_ONCE(t, TRIGGER_OFF);
	t->state = TRIGGER_READY;
}

static inline void trigger_ready(struct trigger *t)
{
	if (!trigger_is_available(t))
		return;
	t->state = TRIGGER_READY;
}

static inline void trigger_hit(struct trigger *t)
{
	if (!trigger_is_available(t))
		return;
	TRIGGER_WARN_ONCE(t, TRIGGER_READY);
	t->state = TRIGGER_HIT;
}

static inline void trigger_off(struct trigger *t)
{
	if (!trigger_is_available(t))
		return;
	t->state = TRIGGER_OFF;
}

static inline void trigger_error(struct trigger *t)
{
	t->state = TRIGGER_ERROR;
}

static inline bool trigger_is_ready(struct trigger *t)
{
	return t->state == TRIGGER_READY;
}

static inline bool trigger_is_hit(struct trigger *t)
{
	return t->state == TRIGGER_HIT;
}

#define DEFINE_TRIGGER(n) \
struct trigger n = {.state = TRIGGER_OFF, .name = #n}
#endif
cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/clock/bcm281xx.h'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>dt-bindings</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>clock</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>bcm281xx.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='396bf4cd835e62d70fad4a03a8963e61f19021f2'/><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'>2017-02-06 14:16:23 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-06 14:16:23 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>396bf4cd835e62d70fad4a03a8963e61f19021f2</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>79ac8f33554260fea1a8d43e6f8c4c5460115f45</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>include/dt-bindings/clock/bcm281xx.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/clock/bcm281xx.h?id=d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c'>d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2&amp;id2=d5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/dt-bindings/clock/bcm281xx.h?id=7c2cf1c4615cc2f576d0604406cdf0065f00b83b'>7c2cf1c4615cc2f576d0604406cdf0065f00b83b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/dt-bindings/clock/bcm281xx.h?id=396bf4cd835e62d70fad4a03a8963e61f19021f2&amp;id2=7c2cf1c4615cc2f576d0604406cdf0065f00b83b'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6</div><div class='commit-msg'>Pull crypto fixes from Herbert Xu:

 - use-after-free in algif_aead

 - modular aesni regression when pcbc is modular but absent

 - bug causing IO page faults in ccp

 - double list add in ccp

 - NULL pointer dereference in qat (two patches)

 - panic in chcr

 - NULL pointer dereference in chcr

 - out-of-bound access in chcr

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: chcr - Fix key length for RFC4106
  crypto: algif_aead - Fix kernel panic on list_del
  crypto: aesni - Fix failure when pcbc module is absent
  crypto: ccp - Fix double add when creating new DMA command
  crypto: ccp - Fix DMA operations when IOMMU is enabled
  crypto: chcr - Check device is allocated before use
  crypto: chcr - Fix panic on dma_unmap_sg
  crypto: qat - zero esram only for DH85x devices
  crypto: qat - fix bar discovery for c62x
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=396bf4cd835e62d70fad4a03a8963e61f19021f2'>Diffstat</a> (limited to 'include/dt-bindings/clock/bcm281xx.h')</div><table summary='diffstat' class='diffstat'>