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/* Copyright 2013 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.
*/
/* This provides the interface for any Ambient Light Sensors that are connected
* to the EC instead of the AP.
*/
#include "als.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "hooks.h"
#include "host_command.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#define CPUTS(outstr) cputs(CC_ALS, outstr)
#define CPRINTS(format, args...) cprints(CC_ALS, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_ALS, format, ## args)
#define ALS_POLL_PERIOD SECOND
static int task_timeout = -1;
int als_read(enum als_id id, int *lux)
{
int af = als[id].attenuation_factor;
return als[id].read(lux, af);
}
void als_task(void *u)
{
int i, val;
uint16_t *mapped = (uint16_t *)host_get_memmap(EC_MEMMAP_ALS);
uint16_t als_data;
while (1) {
task_wait_event(task_timeout);
/* If task was disabled while waiting do not read from ALS */
if (task_timeout < 0)
continue;
for (i = 0; i < EC_ALS_ENTRIES && i < ALS_COUNT; i++) {
als_data = als_read(i, &val) == EC_SUCCESS ? val : 0;
mapped[i] = als_data;
}
}
}
static void als_task_enable(void)
{
int fail_count = 0;
int err;
int i;
for (i = 0; i < EC_ALS_ENTRIES && i < ALS_COUNT; i++) {
err = als[i].init();
if (err) {
fail_count++;
CPRINTF("%s ALS sensor failed to initialize, err=%d\n",
als[i].name, err);
}
}
/*
* If all the ALS filed to initialize, disable the ALS task.
*/
if (fail_count == ALS_COUNT)
task_timeout = -1;
else
task_timeout = ALS_POLL_PERIOD;
task_wake(TASK_ID_ALS);
}
static void als_task_disable(void)
{
task_timeout = -1;
}
static void als_task_init(void)
{
/*
* Enable ALS task in S0 only and may need to re-enable
* when sysjumped.
*/
if (system_jumped_late() &&
chipset_in_state(CHIPSET_STATE_ON))
als_task_enable();
}
DECLARE_HOOK(HOOK_CHIPSET_RESUME, als_task_enable, HOOK_PRIO_ALS_INIT);
DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, als_task_disable, HOOK_PRIO_DEFAULT);
DECLARE_HOOK(HOOK_INIT, als_task_init, HOOK_PRIO_ALS_INIT);
/*****************************************************************************/
/* Console commands */
#ifdef CONFIG_CMD_ALS
static int command_als(int argc, char **argv)
{
int i, rv, val;
for (i = 0; i < ALS_COUNT; i++) {
ccprintf("%s: ", als[i].name);
rv = als_read(i, &val);
switch (rv) {
case EC_SUCCESS:
ccprintf("%d lux\n", val);
break;
default:
ccprintf("Error %d\n", rv);
}
}
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(als, command_als,
NULL,
"Print ALS values");
#endif
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