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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Event handling in MKBP keyboard protocol
*/
#include "atomic.h"
#include "chipset.h"
#include "gpio.h"
#include "host_command.h"
#include "link_defs.h"
#include "mkbp_event.h"
#include "power.h"
#include "util.h"
static uint32_t events;
static void set_event(uint8_t event_type)
{
atomic_or(&events, 1 << event_type);
}
static void clear_event(uint8_t event_type)
{
atomic_clear(&events, 1 << event_type);
}
static int event_is_set(uint8_t event_type)
{
return events & (1 << event_type);
}
/**
* Assert host keyboard interrupt line.
*/
static void set_host_interrupt(int active)
{
/* interrupt host by using active low EC_INT signal */
#ifdef CONFIG_MKBP_USE_HOST_EVENT
if (active)
host_set_single_event(EC_HOST_EVENT_MKBP);
#else
gpio_set_level(GPIO_EC_INT_L, !active);
#endif
}
/**
* Check if the host is sleeping. Check our power state in addition to the
* self-reported sleep state of host (CONFIG_POWER_TRACK_HOST_SLEEP_STATE).
*/
static inline int host_is_sleeping(void)
{
int is_sleeping = !chipset_in_state(CHIPSET_STATE_ON);
#ifdef CONFIG_POWER_TRACK_HOST_SLEEP_STATE
enum host_sleep_event sleep_state = power_get_host_sleep_state();
is_sleeping |=
(sleep_state == HOST_SLEEP_EVENT_S3_SUSPEND ||
sleep_state == HOST_SLEEP_EVENT_S3_WAKEABLE_SUSPEND);
#endif
return is_sleeping;
}
int mkbp_send_event(uint8_t event_type)
{
set_event(event_type);
#ifdef CONFIG_MKBP_WAKEUP_MASK
/* Only assert interrupt for wake events if host is sleeping */
if (host_is_sleeping()) {
/* Skip host wake if this isn't a wake event */
if (!(host_get_events() & CONFIG_MKBP_WAKEUP_MASK) &&
event_type != EC_MKBP_EVENT_KEY_MATRIX)
return 0;
}
#endif
set_host_interrupt(1);
return 1;
}
static int mkbp_get_next_event(struct host_cmd_handler_args *args)
{
static int last;
int i, data_size, evt;
uint8_t *resp = args->response;
const struct mkbp_event_source *src;
do {
/*
* Find the next event to service. We do this in a round-robin
* way to make sure no event gets starved.
*/
for (i = 0; i < EC_MKBP_EVENT_COUNT; ++i)
if (event_is_set((last + i) % EC_MKBP_EVENT_COUNT))
break;
if (i == EC_MKBP_EVENT_COUNT) {
set_host_interrupt(0);
return EC_RES_UNAVAILABLE;
}
evt = (i + last) % EC_MKBP_EVENT_COUNT;
last = evt + 1;
/*
* Clear the event before retrieving the event data in case the
* event source wants to send the same event.
*/
clear_event(evt);
for (src = __mkbp_evt_srcs; src < __mkbp_evt_srcs_end; ++src)
if (src->event_type == evt)
break;
if (src == __mkbp_evt_srcs_end)
return EC_RES_ERROR;
resp[0] = evt; /* Event type */
/*
* get_data() can return -EC_ERROR_BUSY which indicates that the
* next element in the keyboard FIFO does not match what we were
* called with. For example, get_data is expecting a keyboard
* matrix, however the next element in the FIFO is a button
* event instead. Therefore, we have to service that button
* event first.
*/
data_size = src->get_data(resp + 1);
if (data_size == -EC_ERROR_BUSY)
set_event(evt);
} while (data_size == -EC_ERROR_BUSY);
if (data_size < 0)
return EC_RES_ERROR;
args->response_size = 1 + data_size;
if (!events)
set_host_interrupt(0);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_GET_NEXT_EVENT,
mkbp_get_next_event,
EC_VER_MASK(0));
#ifdef CONFIG_MKBP_WAKEUP_MASK
static int mkbp_get_wake_mask(struct host_cmd_handler_args *args)
{
struct ec_response_host_event_mask *r = args->response;
r->mask = CONFIG_MKBP_WAKEUP_MASK;
args->response_size = sizeof(*r);
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_HOST_EVENT_GET_WAKE_MASK,
mkbp_get_wake_mask,
EC_VER_MASK(0));
#endif
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