mirror of
https://github.com/Telecominfraproject/OpenCellular.git
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6ee7b1e34e
Some platforms are unable to access the 900h-9ffh region over LPC and must instead access memmap data through the ACPI CMD / DATA ports. To avoid racing with data updates, disallow changes to multi-byte memmap data while in burst mode. Linux currently enables burst mode when accessing multi-byte data and disables it immediately afterward, though the ACPI spec defines burst mode in a more general way. BUG=chrome-os-partner:38224 TEST=Manual on Samus. Undefine LPC_MEMMAP and modify asl to move memmap data to ERAM at offset 0x20. Verify system boots cleanly and battery status is updated immediately on plug / unplug. BRANCH=None Change-Id: Ib848bdb491fdfece96ad0cee7a44ba85b4a1a50b Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/262072 Reviewed-by: Randall Spangler <rspangler@chromium.org> Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
67 lines
1.4 KiB
C
67 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 "host_command.h"
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#include "task.h"
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#include "timer.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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int af = als[id].attenuation_factor;
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return als[id].read(lux, af);
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}
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void als_task(void)
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{
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int i, val;
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uint16_t *mapped = (uint16_t *)host_get_memmap(EC_MEMMAP_ALS);
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uint16_t als_data;
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while (1) {
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for (i = 0; i < EC_ALS_ENTRIES && i < ALS_COUNT; i++) {
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als_data = als_read(i, &val) == EC_SUCCESS ? val : 0;
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host_lock_memmap();
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mapped[i] = als_data;
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host_unlock_memmap();
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}
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task_wait_event(SECOND);
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}
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}
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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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