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1d2845d2db
This adds space for up to two ALS lux readings to be available to the AP
through the memory-mapped LPC region. If enabled, the values are updated
once a second.
The ALS will be reinitialized at every AP resume, since it's typically
unpowered otherwise. The reported value will be zero when the ALS is off.
BUG=chrome-os-partner:23380
BRANCH=samus
TEST=manual
Boot the AP, then from the EC console run "als" or just monitor the
memory-mapped region directly ("rw 0x40080780" on Samus), while pointing the
sensor at bright and dim areas. The value should change.
Change-Id: I705371fcd57345dc9adae1231ea30c7ff024aaf8
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/176142
Reviewed-by: Randall Spangler <rspangler@chromium.org>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* This provides the interface for any Ambient Light Sensors that are connected
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* to the EC instead of the AP.
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*/
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#include "als.h"
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#include "common.h"
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#include "console.h"
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#include "hooks.h"
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#include "host_command.h"
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#include "util.h"
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int als_read(enum als_id id, int *lux)
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{
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return als[id].read(lux);
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}
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/*****************************************************************************/
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/* Hooks */
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static void als_update(void)
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{
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int i, rv, val;
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uint16_t *mapped = (uint16_t *)host_get_memmap(EC_MEMMAP_ALS);
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for (i = 0; i < EC_ALS_ENTRIES && i < ALS_COUNT; i++) {
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rv = als_read(i, &val);
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if (rv == EC_SUCCESS)
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mapped[i] = val;
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else
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mapped[i] = 0;
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}
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}
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DECLARE_HOOK(HOOK_SECOND, als_update, HOOK_PRIO_DEFAULT);
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/*****************************************************************************/
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/* Console commands */
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static int command_als(int argc, char **argv)
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{
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int i, rv, val;
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for (i = 0; i < ALS_COUNT; i++) {
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ccprintf("%s: ", als[i].name);
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rv = als_read(i, &val);
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switch (rv) {
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case EC_SUCCESS:
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ccprintf("%d lux\n", val);
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break;
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default:
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ccprintf("Error %d\n", rv);
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}
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}
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(als, command_als,
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NULL,
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"Print ALS values",
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NULL);
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