Add ALS driver for light sensors connected to EC

This adds the driver and a console command to read an Intersil ISL29305
light sensor connected to the EC.

BUG=chrome-os-partner:23380
BRANCH=samus
TEST=manual

Run the "als" command from the EC console, while pointing the sensor in
various directions. It should give higher numbers when facing a light
source.  If you get "Error 1", it means the ALS isn't powered.

Change-Id: I855ed64dab7fc60e29126ab3e97669be24dc6a64
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/176056

1 files changed, 45 insertions, 0 deletions

diff --git a/common/als.c b/common/als.c
new file mode 100644
index 0000000000..bb2854132f
--- /dev/null
+++ b/common/als.c
@@ -0,0 +1,45 @@
+/* Copyright (c) 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 "common.h"
+#include "console.h"
+#include "host_command.h"
+#include "util.h"
+
+int als_read(enum als_id id, int *lux)
+{
+	return als[id].read(lux);
+}
+
+/*****************************************************************************/
+/* Console commands */
+
+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",
+			NULL);