driver: Add support bma255 sensor

BMA255 is one of BMA2x2 accel sensor series.
Adding defines,driver from
https://github.com/BoschSensortec/BMA2x2_driver

BUG=chrome-os-partner:52877
BRANCH=none
TEST="accelread 2" is working on kevin, also check accelrate,
accelrange can set proper value on IC

Change-Id: I99932ff75aae91a744fe18dddc010b802085a2da
Signed-off-by: Wonjoon Lee <woojoo.lee@samsung.com>
Reviewed-on: https://chromium-review.googlesource.com/347722
Reviewed-by: Shawn N <shawnn@chromium.org>

1 files changed, 340 insertions, 0 deletions

diff --git a/driver/accel_bma2x2.c b/driver/accel_bma2x2.c
new file mode 100644
index 0000000000..89c3f9fa66
--- /dev/null
+++ b/driver/accel_bma2x2.c
@@ -0,0 +1,340 @@
+/* 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.
+ */
+
+/*
+ * Bosch Accelerometer driver for Chrome EC
+ *
+ * Supported: BMA255
+ */
+
+#include "accelgyro.h"
+#include "common.h"
+#include "console.h"
+#include "driver/accel_bma2x2.h"
+#include "i2c.h"
+#include "math_util.h"
+#include "spi.h"
+#include "task.h"
+#include "util.h"
+
+#define CPUTS(outstr) cputs(CC_ACCEL, outstr)
+#define CPRINTF(format, args...) cprintf(CC_ACCEL, format, ## args)
+
+/* Number of times to attempt to enable sensor before giving up. */
+#define SENSOR_ENABLE_ATTEMPTS 5
+
+/*
+ * Struct for pairing an engineering value with the register value for a
+ * parameter.
+ */
+struct accel_param_pair {
+	int val; /* Value in engineering units. */
+	int reg; /* Corresponding register value. */
+};
+
+/* List of range values in +/-G's and their associated register values. */
+static const struct accel_param_pair ranges[] = {
+	{2, BMA2x2_RANGE_2G},
+	{4, BMA2x2_RANGE_4G},
+	{8, BMA2x2_RANGE_8G},
+	{16, BMA2x2_RANGE_16G},
+};
+
+/* List of ODR values in mHz and their associated register values. */
+static const struct accel_param_pair datarates[] = {
+	{781,     BMA2x2_BW_7_81HZ},
+	{1563,    BMA2x2_BW_15_63HZ},
+	{3125,    BMA2x2_BW_31_25HZ},
+	{6250,    BMA2x2_BW_62_50HZ},
+	{12500,   BMA2x2_BW_125HZ},
+	{25000,   BMA2x2_BW_250HZ},
+	{50000,   BMA2x2_BW_500HZ},
+	{100000,  BMA2x2_BW_1000HZ},
+};
+
+/**
+ * Find index into a accel_param_pair that matches the given engineering value
+ * passed in. The round_up flag is used to specify whether to round up or down.
+ * Note, this function always returns a valid index. If the request is
+ * outside the range of values, it returns the closest valid index.
+ */
+static int find_param_index(const int eng_val, const int round_up,
+			const struct accel_param_pair *pairs,
+			const int size)
+{
+	int i = 0;
+
+	/* match first index */
+	if (eng_val <= pairs[i].val)
+		return i;
+
+	/* Linear search for index to match. */
+	while (++i < size) {
+		if (eng_val < pairs[i].val)
+			return round_up ? i : i - 1;
+		else if (eng_val == pairs[i].val)
+			return i;
+	}
+
+	return i - 1;
+}
+
+/**
+ * Read register from accelerometer.
+ */
+static int raw_read8(const int port, const int addr, const int reg,
+					 int *data_ptr)
+{
+	return i2c_read8(port, addr, reg, data_ptr);
+}
+
+/**
+ * Write register from accelerometer.
+ */
+static int raw_write8(const int port, const int addr, const int reg, int data)
+{
+	return i2c_write8(port, addr, reg, data);
+}
+
+static int raw_read_multi(const int port, int addr, uint8_t reg,
+			  uint8_t *rxdata, int rxlen)
+{
+	int rv;
+
+	i2c_lock(port, 1);
+	rv = i2c_xfer(port, addr, &reg, 1, rxdata, rxlen,
+		      I2C_XFER_SINGLE);
+	i2c_lock(port, 0);
+
+	return rv;
+}
+
+static int set_range(const struct motion_sensor_t *s, int range, int rnd)
+{
+	int ret,  index, reg, range_val, reg_val, range_reg_val;
+	struct bma2x2_accel_data *data = s->drv_data;
+
+	/* Find index for interface pair matching the specified range. */
+	index = find_param_index(range, rnd, ranges, ARRAY_SIZE(ranges));
+
+	reg = BMA2x2_RANGE_SELECT_REG;
+	range_val = ranges[index].reg;
+
+	mutex_lock(s->mutex);
+
+	/* Determine the new value of control reg and attempt to write it. */
+	ret = raw_read8(s->port, s->addr, reg, &range_reg_val);
+	if (ret != EC_SUCCESS) {
+		mutex_unlock(s->mutex);
+		return ret;
+	}
+	reg_val = (range_reg_val & ~BMA2x2_RANGE_SELECT_MSK) | range_val;
+	ret = raw_write8(s->port, s->addr, reg, reg_val);
+
+	/* If successfully written, then save the range. */
+	if (ret == EC_SUCCESS)
+		data->sensor_range = index;
+
+	mutex_unlock(s->mutex);
+
+	return ret;
+}
+
+static int get_range(const struct motion_sensor_t *s)
+{
+	struct bma2x2_accel_data *data = s->drv_data;
+
+	return ranges[data->sensor_range].val;
+}
+
+static int set_resolution(const struct motion_sensor_t *s, int res, int rnd)
+{
+	/* Only one resolution, BMA2x2_RESOLUTION, so nothing to do. */
+	return EC_SUCCESS;
+}
+
+static int get_resolution(const struct motion_sensor_t *s)
+{
+	return BMA2x2_RESOLUTION;
+}
+
+static int set_data_rate(const struct motion_sensor_t *s, int rate, int rnd)
+{
+	int ret, index, odr_val, odr_reg_val, reg_val, reg;
+	struct bma2x2_accel_data *data = s->drv_data;
+
+	/* Find index for interface pair matching the specified rate. */
+	index = find_param_index(rate, rnd, datarates, ARRAY_SIZE(datarates));
+
+	odr_val = datarates[index].reg;
+	reg = BMA2x2_BW_REG;
+
+	mutex_lock(s->mutex);
+
+	/* Determine the new value of control reg and attempt to write it. */
+	ret = raw_read8(s->port, s->addr, reg, &odr_reg_val);
+	if (ret != EC_SUCCESS) {
+		mutex_unlock(s->mutex);
+		return ret;
+	}
+	reg_val = (odr_reg_val & ~BMA2x2_BW_MSK) | odr_val;
+	/* Set output data rate. */
+	ret = raw_write8(s->port, s->addr, reg, reg_val);
+
+	/* If successfully written, then save the new data rate. */
+	if (ret == EC_SUCCESS)
+		data->sensor_datarate = index;
+
+	mutex_unlock(s->mutex);
+	return ret;
+}
+
+static int get_data_rate(const struct motion_sensor_t *s)
+{
+	struct bma2x2_accel_data *data = s->drv_data;
+
+	return datarates[data->sensor_datarate].val;
+}
+
+static int set_offset(const struct motion_sensor_t *s, const int16_t *offset,
+		      int16_t temp)
+{
+	/* temperature is ignored */
+	struct bma2x2_accel_data *data = s->drv_data;
+
+	data->offset[X] = offset[X];
+	data->offset[Y] = offset[Y];
+	data->offset[Z] = offset[Z];
+
+	return EC_SUCCESS;
+}
+
+static int get_offset(const struct motion_sensor_t *s, int16_t *offset,
+		      int16_t *temp)
+{
+	struct bma2x2_accel_data *data = s->drv_data;
+
+	offset[X] = data->offset[X];
+	offset[Y] = data->offset[Y];
+	offset[Z] = data->offset[Z];
+	*temp = EC_MOTION_SENSE_INVALID_CALIB_TEMP;
+
+	return EC_SUCCESS;
+}
+
+static int read(const struct motion_sensor_t *s, vector_3_t v)
+{
+	uint8_t acc[6];
+	int ret, i, range;
+	struct bma2x2_accel_data *data = s->drv_data;
+
+	/* Read 6 bytes starting at X_AXIS_LSB. */
+	mutex_lock(s->mutex);
+	ret = raw_read_multi(s->port, s->addr, BMA2x2_X_AXIS_LSB_ADDR, acc, 6);
+	mutex_unlock(s->mutex);
+
+	if (ret != EC_SUCCESS)
+		return ret;
+
+	/*
+	 * Convert acceleration to a signed 16-bit number. Note, based on
+	 * the order of the registers:
+	 *
+	 * acc[0] = X_AXIS_LSB -> bit 7~4 for value, bit 0 for new data bit
+	 * acc[1] = X_AXIS_MSB
+	 * acc[2] = Y_AXIS_LSB -> bit 7~4 for value, bit 0 for new data bit
+	 * acc[3] = Y_AXIS_MSB
+	 * acc[4] = Z_AXIS_LSB -> bit 7~4 for value, bit 0 for new data bit
+	 * acc[5] = Z_AXIS_MSB
+	 *
+	 * Add calibration offset before returning the data.
+	 */
+	for (i = X; i <= Z; i++)
+		v[i] = (((int8_t)acc[i * 2 + 1]) << 8) | (acc[i * 2] & 0xf0);
+	rotate(v, *s->rot_standard_ref, v);
+
+	/* apply offset in the device coordinates */
+	range = get_range(s);
+	for (i = X; i <= Z; i++)
+		v[i] += (data->offset[i] << 5) / range;
+
+	return EC_SUCCESS;
+}
+
+static int init(const struct motion_sensor_t *s)
+{
+	int ret = 0, tries = 0, val, reg, reset_field;
+
+	ret = raw_read8(s->port, s->addr, BMA2x2_CHIP_ID_ADDR, &val);
+	if (ret)
+		return EC_ERROR_UNKNOWN;
+
+	if (val != BMA255_CHIP_ID_MAJOR)
+		return EC_ERROR_ACCESS_DENIED;
+
+	/* Reset the chip to be in a good state */
+	reg = BMA2x2_RST_ADDR;
+	reset_field = BMA2x2_CMD_SOFT_RESET;
+
+	mutex_lock(s->mutex);
+
+	ret = raw_read8(s->port, s->addr, reg, &val);
+	if (ret != EC_SUCCESS) {
+		mutex_unlock(s->mutex);
+		return ret;
+	}
+	val |= reset_field;
+	ret = raw_write8(s->port, s->addr, reg, val);
+	if (ret != EC_SUCCESS) {
+		mutex_unlock(s->mutex);
+		return ret;
+	}
+
+	/* The SRST will be cleared when reset is complete. */
+	do {
+		ret = raw_read8(s->port, s->addr, reg, &val);
+
+		/* Reset complete. */
+		if ((ret == EC_SUCCESS) && !(val & reset_field))
+			break;
+
+		/* Check for tires. */
+		if (tries++ > SENSOR_ENABLE_ATTEMPTS) {
+			ret = EC_ERROR_TIMEOUT;
+			mutex_unlock(s->mutex);
+			return ret;
+		}
+		msleep(1);
+	} while (1);
+	mutex_unlock(s->mutex);
+
+	/* Initialize with the desired parameters. */
+	ret = set_range(s, s->default_range, 1);
+	if (ret != EC_SUCCESS)
+		return ret;
+
+	ret = set_resolution(s, 12, 1);
+	if (ret != EC_SUCCESS)
+		return ret;
+
+	CPRINTF("[%T %s: Done Init type:0x%X range:%d]\n",
+		s->name, s->type, get_range(s));
+
+	return ret;
+}
+
+const struct accelgyro_drv bma2x2_accel_drv = {
+	.init = init,
+	.read = read,
+	.set_range = set_range,
+	.get_range = get_range,
+	.set_resolution = set_resolution,
+	.get_resolution = get_resolution,
+	.set_data_rate = set_data_rate,
+	.get_data_rate = get_data_rate,
+	.set_offset = set_offset,
+	.get_offset = get_offset,
+	.perform_calib = NULL,
+};