driver/als_cm32183: Add ALS source

add new ALS source.

BUG=b:208721153
BRANCH=none
TEST=rework on Brya, can read data by ectool I2C command
read lux (console) : accelread 4
                     Current data 4: 154   0     0
		     Last calib. data 4: 154   0     0
als info (ectool) : ectool motionsense info 4
                    ectool motionsense
                    sensor 4: 154  0   0

Signed-off-by: Owen_Ou <Owen_Ou@compal.corp-partner.google.com>
Change-Id: I67f1184cefed257956cfe0f988c87e4f81db3fc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3350267
Tested-by: Owen Ou <owen_ou@compal.corp-partner.google.com>
Auto-Submit: Owen Ou <owen_ou@compal.corp-partner.google.com>
Reviewed-by: caveh jalali <caveh@chromium.org>
Commit-Queue: caveh jalali <caveh@chromium.org>

3 files changed, 255 insertions, 0 deletions

diff --git a/driver/als_cm32183.c b/driver/als_cm32183.c
new file mode 100644
index 0000000000..e5efa29f03
--- /dev/null
+++ b/driver/als_cm32183.c
@@ -0,0 +1,151 @@
+/* Copyright 2022 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.
+ *
+ * CAPELLA CM32183 light sensor driver
+ */
+
+#include "common.h"
+#include "driver/als_cm32183.h"
+#include "i2c.h"
+#include "accelgyro.h"
+#include "math_util.h"
+
+struct cm32183_drv_data {
+	int rate;
+	int last_value;
+	/* the coefficient is scale.uscale */
+	int16_t scale;
+	uint16_t uscale;
+	int16_t offset;
+};
+
+#define CM32183_GET_DATA(_s)	((struct cm32183_drv_data *)(_s)->drv_data)
+
+/*
+ * Read CM32183 light sensor data.
+ */
+static int cm32183_read_lux(int *lux)
+{
+	int ret;
+	int data;
+
+	ret = i2c_read16(I2C_PORT_SENSOR, CM32183_I2C_ADDR,
+		CM32183_REG_ALS_RESULT, &data);
+
+	if (ret)
+		return ret;
+
+	/*
+	 * lux = data * 0.016
+	 */
+	*lux = (data * 16)/1000;
+
+	return EC_SUCCESS;
+}
+
+/*
+ * Read data from CM32183 light sensor, and transfer unit into lux.
+ */
+static int cm32183_read(const struct motion_sensor_t *s, intv3_t v)
+{
+	struct cm32183_drv_data *drv_data = CM32183_GET_DATA(s);
+	int ret;
+	int lux_data;
+
+	ret = cm32183_read_lux(&lux_data);
+
+	if (ret)
+		return ret;
+
+	lux_data += drv_data->offset;
+
+	v[0] = lux_data;
+	v[1] = 0;
+	v[2] = 0;
+
+	/*
+	 * Return an error when nothing change to prevent filling the
+	 * fifo with useless data.
+	 */
+	if (v[0] == drv_data->last_value)
+		return EC_ERROR_UNCHANGED;
+
+	drv_data->last_value = v[0];
+	return EC_SUCCESS;
+}
+
+static int cm32183_set_range(struct motion_sensor_t *s, int range,
+			     int rnd)
+{
+	return EC_SUCCESS;
+}
+
+static int cm32183_set_data_rate(const struct motion_sensor_t *s,
+				int rate, int roundup)
+{
+	CM32183_GET_DATA(s)->rate = rate;
+	return EC_SUCCESS;
+}
+
+static int cm32183_get_data_rate(const struct motion_sensor_t *s)
+{
+	return CM32183_GET_DATA(s)->rate;
+}
+
+static int cm32183_set_offset(const struct motion_sensor_t *s,
+			const int16_t *offset, int16_t temp)
+{
+	/* TODO: check calibration method */
+	return EC_SUCCESS;
+}
+
+static int cm32183_get_offset(const struct motion_sensor_t *s,
+			int16_t *offset, int16_t *temp)
+{
+	*offset = CM32183_GET_DATA(s)->offset;
+	return EC_SUCCESS;
+}
+
+#ifdef CONFIG_ACCEL_INTERRUPTS
+static int cm32183_irq_handler(struct motion_sensor_t *s, uint32_t *event)
+{
+	return cm32183_read(s, s->xyz);
+}
+#endif
+
+/**
+ * Initialise CM32183 light sensor.
+ */
+static int cm32183_init(struct motion_sensor_t *s)
+{
+	int ret;
+	int data;
+
+	ret = i2c_write16(s->port, s->i2c_spi_addr_flags,
+		CM32183_REG_CONFIGURE, CM32183_REG_CONFIGURE_CH_EN);
+
+	if (ret)
+		return ret;
+
+	ret = i2c_read16(s->port, s->i2c_spi_addr_flags,
+		CM32183_REG_ALS_RESULT, &data);
+
+	if (ret)
+		return ret;
+
+	return sensor_init_done(s);
+}
+
+const struct accelgyro_drv cm32183_drv = {
+	.init = cm32183_init,
+	.read = cm32183_read,
+	.set_range = cm32183_set_range,
+	.set_offset = cm32183_set_offset,
+	.get_offset = cm32183_get_offset,
+	.set_data_rate = cm32183_set_data_rate,
+	.get_data_rate = cm32183_get_data_rate,
+#ifdef CONFIG_ACCEL_INTERRUPTS
+	.irq_handler = cm32183_irq_handler,
+#endif
+};
diff --git a/driver/als_cm32183.h b/driver/als_cm32183.h
new file mode 100644
index 0000000000..457a9e02ee
--- /dev/null
+++ b/driver/als_cm32183.h
@@ -0,0 +1,103 @@
+/* Copyright 2022 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.
+ *
+ * CAPELLA CM32183 light sensor driver
+ */
+
+#ifndef __CROS_EC_ALS_CM32183_H
+#define __CROS_EC_ALS_CM32183_H
+
+/* I2C interface */
+#define CM32183_I2C_ADDR		(0x29 | I2C_FLAG_BIG_ENDIAN)
+
+/* CM32183 registers */
+#define CM32183_REG_CONFIGURE		0x00
+
+#define CM32183_REG_CONFIGURE_CH_EN			0x0004
+
+/* ALS Sensitivity_mode (BIT 12:11) */
+#define CM32183_REG_CONFIGURE_ALS_SENSITIVITY_MASK	GENMASK(12, 11)
+#define CM32183_REG_CONFIGURE_ALS_SENSITIVITY_SHIFT		11
+#define CM32183_REG_CONFIGURE_ALS_SENSITIVITY_1		0
+#define CM32183_REG_CONFIGURE_ALS_SENSITIVITY_2		1
+#define CM32183_REG_CONFIGURE_ALS_SENSITIVITY_1_DIV_8		2
+#define CM32183_REG_CONFIGURE_ALS_SENSITIVITY_1_DIV_4		3
+
+/*
+ * Gain mode
+ * 0 Gain*1
+ * 1 Gain*2  (bit 10)
+ */
+#define CM32183_REG_CONFIGURE_GAIN  BIT(10)
+
+/*
+ * ALS integration time setting which represents how long
+ * ALS can update the readout value (BIT 9:6)
+ * BIT 9:6     function
+ *  0000         100ms
+ *  0001         200ms
+ *  0010         400ms
+ *  0011         800ms
+ */
+#define CM32183_REG_CONFIGURE_ALS_INTEGRATION_MASK	GENMASK(9, 6)
+#define CM32183_REG_CONFIGURE_ALS_INTEGRATION_SHIFT		6
+#define CM32183_REG_CONFIGURE_ALS_INTEGRATION_SET100MS	0
+#define CM32183_REG_CONFIGURE_ALS_INTEGRATION_SET200MS	1
+#define CM32183_REG_CONFIGURE_ALS_INTEGRATION_SET400MS	2
+#define CM32183_REG_CONFIGURE_ALS_INTEGRATION_SET800MS	3
+
+/*
+ * ALS interrupt persistence setting.The interrupt pin is
+ * triggered while sensor reading is out of threshold windows
+ * after consecutive number of measurement cycle. (BIT 5:4)
+ *  BIT 5:4      measurement cycle
+ *    00                 1
+ *    01                 2
+ *    10                 4
+ *    11                 8
+ */
+#define CM32183_REG_CONFIGURE_MEASUREMENT_MASK	GENMASK(5, 4)
+#define CM32183_REG_CONFIGURE_MEASUREMENT_SHIFT		4
+#define CM32183_REG_CONFIGURE_MEASUREMENT_CYCLE_1	0
+#define CM32183_REG_CONFIGURE_MEASUREMENT_CYCLE_2	1
+#define CM32183_REG_CONFIGURE_MEASUREMENT_CYCLE_4	2
+#define CM32183_REG_CONFIGURE_MEASUREMENT_CYCLE_8	3
+
+/*
+ * channel selection of interrupt (BIT 3)
+ * 0   ALS CH interrupt
+ * 1   White CH interrupt
+ */
+#define CM32183_REG_CONFIGURE_CHANNEL_SELECTION  BIT(3)
+
+/*
+ * Channel enable (BIT 2)
+ *  0   ALS CH enable only
+ *  1   ALS & White CH enable
+ */
+#define CM32183_REG_CONFIGURE_CHANNEL_ENABLE  BIT(2)
+
+/* enable/disable interrupt function (BIT 1) */
+#define CM32183_REG_CONFIGURE_INTERRUPT_ENABLE  BIT(1)
+
+/*
+ * how to power on and shutdown sensor (BIT 0)
+ * 0   power on
+ * 1   shutdown
+ */
+#define CM32183_REG_CONFIGURE_POWER  BIT(0)
+
+#define CM32183_REG_INT_HSB		0x01
+#define CM32183_REG_INT_LSB		0x02
+#define CM32183_REG_ALS_RESULT		0x04
+#define CM32183_REG_WHITE_RESULT		0x05
+
+#define CM32183_REG_TRIGGER      0x06
+
+#define CM32183_REG_TRIGGER_LOW_THRESHOLD     BIT(15)
+#define CM32183_REG_TRIGGER_HIGH_THRESHOLD    BIT(14)
+
+extern const struct accelgyro_drv cm32183_drv;
+
+#endif	/* __CROS_EC_ALS_CM32183_H */
diff --git a/driver/build.mk b/driver/build.mk
index 271404ba09..63df758b11 100644
--- a/driver/build.mk
+++ b/driver/build.mk
@@ -47,6 +47,7 @@ driver-$(CONFIG_ALS_OPT3001)+=als_opt3001.o
 driver-$(CONFIG_ALS_SI114X)+=als_si114x.o
 driver-$(CONFIG_ALS_BH1730)+=als_bh1730.o
 driver-$(CONFIG_ALS_TCS3400)+=als_tcs3400.o
+driver-$(CONFIG_ALS_CM32183)+=als_cm32183.o
 
 # Barometers
 driver-$(CONFIG_BARO_BMP280)+=baro_bmp280.o