driver: add support ambient light sensor AL3010stabilize-8798.B

AL3010 is Dyna-Image ambient light sensor.
Here is add basic driver and functions.

BUG=chrome-os-partner:52915
BRANCH=elm
TEST=Flash on base board "glados" with ASUS
al3010_init is return success.
al3010_read_lux is return the lux success.

Change-Id: Ie3b97d0889b150c43d19bc84d84f04c13e415c31
Signed-off-by: Rocky Hsiao <rocky.hsiao@dyna-image.com>
Reviewed-on: https://chromium-review.googlesource.com/356874
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Thomas Lin <thomas.lin@dyna-image.com>

4 files changed, 91 insertions, 0 deletions

diff --git a/driver/als_al3010.c b/driver/als_al3010.c
new file mode 100644
index 0000000000..b129dc2f57
--- /dev/null
+++ b/driver/als_al3010.c
@@ -0,0 +1,49 @@
+/* Copyright 2015 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.
+ *
+ * Dyna-Image AL3010 light sensor driver
+ */
+
+#include "driver/als_al3010.h"
+#include "i2c.h"
+
+/**
+ * Initialise AL3010 light sensor.
+ */
+int al3010_init(void)
+{
+	int ret;
+
+	ret = i2c_write8(I2C_PORT_ALS, AL3010_I2C_ADDR,
+			 AL3010_REG_CONFIG, AL3010_GAIN << 4);
+	if (ret)
+		return ret;
+
+	return i2c_write8(I2C_PORT_ALS, AL3010_I2C_ADDR,
+			  AL3010_REG_SYSTEM, AL3010_ENABLE);
+}
+
+/**
+ * Read AL3010 light sensor data.
+ */
+int al3010_read_lux(int *lux, int af)
+{
+	int ret;
+	int val;
+	long long val64;
+
+	ret = i2c_read16(I2C_PORT_ALS, AL3010_I2C_ADDR,
+			 AL3010_REG_DATA_LOW, &val);
+
+	if (ret)
+		return ret;
+
+	val64 = val;
+	val64 = (val64 * AL3010_GAIN_SCALE) / 10000;
+	val = val64 * af / 100;
+
+	*lux = val;
+
+	return EC_SUCCESS;
+}
diff --git a/driver/als_al3010.h b/driver/als_al3010.h
new file mode 100644
index 0000000000..eb06762883
--- /dev/null
+++ b/driver/als_al3010.h
@@ -0,0 +1,40 @@
+/* Copyright 2015 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.
+ *
+ * Dyna-Image AL3010 light sensor driver
+ */
+
+#ifndef __CROS_EC_ALS_AL3010_H
+#define __CROS_EC_ALS_AL3010_H
+
+/* I2C interface */
+#define AL3010_I2C_ADDR1		(0x1C << 1)
+#define AL3010_I2C_ADDR2		(0x1D << 1)
+#define AL3010_I2C_ADDR3		(0x1E << 1)
+
+/* AL3010 registers */
+#define AL3010_REG_SYSTEM		0x00
+#define AL3010_REG_INT_STATUS		0x01
+#define AL3010_REG_CONFIG		0x10
+#define AL3010_REG_DATA_LOW		0x0C
+
+#define AL3010_ENABLE	0x01
+#define AL3010_GAIN_SELECT 3
+
+#define	AL3010_GAIN_1 0 /* 77806 lx */
+#define	AL3010_GAIN_2 1 /* 19452 lx  */
+#define	AL3010_GAIN_3 2 /* 4863  lx  */
+#define	AL3010_GAIN_4 3 /* 1216  lx  */
+#define AL3010_GAIN	CONCAT2(AL3010_GAIN_, AL3010_GAIN_SELECT)
+
+#define AL3010_GAIN_SCALE_1 11872	/* 1.1872 lux/count */
+#define AL3010_GAIN_SCALE_2 2968	/* 0.2968 lux/count */
+#define AL3010_GAIN_SCALE_3 742		/* 0.0742 lux/count */
+#define AL3010_GAIN_SCALE_4 186		/* 0.0186 lux/count */
+#define AL3010_GAIN_SCALE CONCAT2(AL3010_GAIN_SCALE_, AL3010_GAIN_SELECT)
+
+int al3010_init(void);
+int al3010_read_lux(int *lux, int af);
+
+#endif	/* __CROS_EC_ALS_AL3010_H */
diff --git a/driver/build.mk b/driver/build.mk
index 514de8cc50..09d2552b19 100644
--- a/driver/build.mk
+++ b/driver/build.mk
@@ -18,6 +18,7 @@ driver-$(CONFIG_MAG_BMI160_BMM150)+=mag_bmm150.o
 driver-$(CONFIG_GYRO_L3GD20H)+=gyro_l3gd20h.o
 
 # ALS drivers
+driver-$(CONFIG_ALS_AL3010)+=als_al3010.o
 driver-$(CONFIG_ALS_ISL29035)+=als_isl29035.o
 driver-$(CONFIG_ALS_OPT3001)+=als_opt3001.o
 driver-$(CONFIG_ALS_SI114X)+=als_si114x.o
diff --git a/include/config.h b/include/config.h
index 72ea36dc8c..abbb0bc10b 100644
--- a/include/config.h
+++ b/include/config.h
@@ -111,6 +111,7 @@
  * specific drivers for each module.
  */
 #undef CONFIG_ALS
+#undef CONFIG_ALS_AL3010
 #undef CONFIG_ALS_ISL29035
 #undef CONFIG_ALS_OPT3001
 /* Define the exact model ID present on the board: SI1141 = 41, SI1142 = 42, */