[PATCH 3/3] iio: accel: BMC150: add support for other Bosch chips

Laurentiu Palcu
2014-08-28T08:35:51Z

The following chips are either similar or have only the resolution
different. Hence, change this driver to support these chips too:

BMI055 - combo chip (accelerometer part is identical to BMC150's)
BMA255 - identical to BMC150's accelerometer
BMA222 - 8 bit resolution
BMA250 - 10 bit resolution
BMA280 - 14 bit resolution

Additionally:
* add bmc150_accel_match_acpi_device() function to check that the device
has been enumerated through ACPI;
* rename bmc150_accel_acpi_gpio_probe() to bmc150_accel_gpio_probe()
since the ACPI matching has been moved to the new function. Also, this
will allow for the GPIO matching to be done against a device tree too, not only
ACPI tree;

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
---
drivers/iio/accel/bmc150-accel.c | 231 ++++++++++++++++++++++++++++++---------
1 file changed, 177 insertions(+), 54 deletions(-)

diff --git a/drivers/iio/accel/bmc150-accel.c b/drivers/iio/accel/bmc150-accel.c
index 0e6566a..07e10fc 100644
--- a/drivers/iio/accel/bmc150-accel.c
+++ b/drivers/iio/accel/bmc150-accel.c
@@ -1,5 +1,12 @@
/*
- * BMC150 3-axis accelerometer driver
+ * 3-axis accelerometer driver supporting following Bosch-Sensortec chips:
+ * - BMC150
+ * - BMI055
+ * - BMA255
+ * - BMA250
+ * - BMA222
+ * - BMA280
+ *
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
@@ -35,6 +42,11 @@

#define BMC150_ACCEL_REG_CHIP_ID 0x00
#define BMC150_ACCEL_CHIP_ID_VAL 0xFA
+#define BMA255_ACCEL_CHIP_ID_VAL 0xFA
+#define BMI055_ACCEL_CHIP_ID_VAL 0xFA
+#define BMA222_ACCEL_CHIP_ID_VAL 0xF8
+#define BMA250_ACCEL_CHIP_ID_VAL 0xF9
+#define BMA280_ACCEL_CHIP_ID_VAL 0xFB

#define BMC150_ACCEL_REG_INT_STATUS_2 0x0B
#define BMC150_ACCEL_ANY_MOTION_MASK 0x07
@@ -126,6 +138,18 @@ enum bmc150_power_modes {
BMC150_ACCEL_SLEEP_MODE_SUSPEND = 0x04,
};

+struct bmc150_scale_info {
+ int scale;
+ int range;
+};
+
+struct bmc150_accel_chip_info {
+ u8 chip_id;
+ const struct iio_chan_spec *channels;
+ int num_channels;
+ const struct bmc150_scale_info scale_table[4];
+};
+
struct bmc150_accel_data {
struct i2c_client *client;
struct iio_trigger *dready_trig;
@@ -140,6 +164,7 @@ struct bmc150_accel_data {
bool dready_trigger_on;
bool motion_trigger_on;
int64_t timestamp;
+ const struct bmc150_accel_chip_info *chip_info;
};

static const struct {
@@ -168,14 +193,6 @@ static const struct {
{0x0F, 1} };

static const struct {
- int scale;
- int range;
-} bmc150_accel_scale_table[] = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
- {19122, BMC150_ACCEL_DEF_RANGE_4G},
- {38344, BMC150_ACCEL_DEF_RANGE_8G},
- {76590, BMC150_ACCEL_DEF_RANGE_16G} };
-
-static const struct {
int sleep_dur;
int reg_value;
} bmc150_accel_sleep_value_table[] = { {0, 0},
@@ -267,7 +284,7 @@ static int bmc150_accel_chip_init(struct bmc150_accel_data *data)
}

dev_dbg(&data->client->dev, "Chip Id %x\n", ret);
- if (ret != BMC150_ACCEL_CHIP_ID_VAL) {
+ if (ret != data->chip_info->chip_id) {
dev_err(&data->client->dev, "Invalid chip %x\n", ret);
return -ENODEV;
}
@@ -541,19 +558,19 @@ static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val)
{
int ret, i;

- for (i = 0; i < ARRAY_SIZE(bmc150_accel_scale_table); ++i) {
- if (bmc150_accel_scale_table[i].scale == val) {
+ for (i = 0; i < ARRAY_SIZE(data->chip_info->scale_table); ++i) {
+ if (data->chip_info->scale_table[i].scale == val) {
ret = i2c_smbus_write_byte_data(
data->client,
BMC150_ACCEL_REG_PMU_RANGE,
- bmc150_accel_scale_table[i].range);
+ data->chip_info->scale_table[i].range);
if (ret < 0) {
dev_err(&data->client->dev,
"Error writing pmu_range\n");
return ret;
}

- data->range = bmc150_accel_scale_table[i].range;
+ data->range = data->chip_info->scale_table[i].range;
return 0;
}
}
@@ -580,10 +597,12 @@ static int bmc150_accel_get_temp(struct bmc150_accel_data *data, int *val)
return IIO_VAL_INT;
}

-static int bmc150_accel_get_axis(struct bmc150_accel_data *data, int axis,
+static int bmc150_accel_get_axis(struct bmc150_accel_data *data,
+ struct iio_chan_spec const *chan,
int *val)
{
int ret;
+ int axis = chan->scan_index;

mutex_lock(&data->mutex);
ret = bmc150_accel_set_power_state(data, true);
@@ -600,7 +619,8 @@ static int bmc150_accel_get_axis(struct bmc150_accel_data *data, int axis,
mutex_unlock(&data->mutex);
return ret;
}
- *val = sign_extend32(ret >> 4, 11);
+ *val = sign_extend32(ret >> chan->scan_type.shift,
+ chan->scan_type.realbits - 1);
ret = bmc150_accel_set_power_state(data, false);
mutex_unlock(&data->mutex);
if (ret < 0)
@@ -625,9 +645,7 @@ static int bmc150_accel_read_raw(struct iio_dev *indio_dev,
if (iio_buffer_enabled(indio_dev))
return -EBUSY;
else
- return bmc150_accel_get_axis(data,
- chan->scan_index,
- val);
+ return bmc150_accel_get_axis(data, chan, val);
default:
return -EINVAL;
}
@@ -647,12 +665,13 @@ static int bmc150_accel_read_raw(struct iio_dev *indio_dev,
{
int i;

- for (i = 0; i < ARRAY_SIZE(bmc150_accel_scale_table);
- ++i) {
- if (bmc150_accel_scale_table[i].range ==
+ for (i = 0;
+ i < ARRAY_SIZE(data->chip_info->scale_table);
+ ++i) {
+ if (data->chip_info->scale_table[i].range ==
data->range) {
*val2 =
- bmc150_accel_scale_table[i].scale;
+ data->chip_info->scale_table[i].scale;
return IIO_VAL_INT_PLUS_MICRO;
}
}
@@ -840,7 +859,7 @@ static const struct iio_event_spec bmc150_accel_event = {
BIT(IIO_EV_INFO_PERIOD)
};

-#define BMC150_ACCEL_CHANNEL(_axis) { \
+#define BMC150_ACCEL_CHANNEL(_axis, bits) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = IIO_MOD_##_axis, \
@@ -850,28 +869,103 @@ static const struct iio_event_spec bmc150_accel_event = {
.scan_index = AXIS_##_axis, \
.scan_type = { \
.sign = 's', \
- .realbits = 12, \
+ .realbits = (bits), \
.storagebits = 16, \
- .shift = 4, \
+ .shift = 16 - (bits), \
}, \
.event_spec = &bmc150_accel_event, \
.num_event_specs = 1 \
}

-static const struct iio_chan_spec bmc150_accel_channels[] = {
- {
- .type = IIO_TEMP,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_SCALE) |
- BIT(IIO_CHAN_INFO_OFFSET),
- .scan_index = -1,
- },
- BMC150_ACCEL_CHANNEL(X),
- BMC150_ACCEL_CHANNEL(Y),
- BMC150_ACCEL_CHANNEL(Z),
- IIO_CHAN_SOFT_TIMESTAMP(3),
+#define BMC150_ACCEL_CHANNELS(bits) { \
+ { \
+ .type = IIO_TEMP, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_OFFSET), \
+ .scan_index = -1, \
+ }, \
+ BMC150_ACCEL_CHANNEL(X, bits), \
+ BMC150_ACCEL_CHANNEL(Y, bits), \
+ BMC150_ACCEL_CHANNEL(Z, bits), \
+ IIO_CHAN_SOFT_TIMESTAMP(3), \
+}
+
+static const struct iio_chan_spec bma222_accel_channels[] =
+ BMC150_ACCEL_CHANNELS(8);
+static const struct iio_chan_spec bma250_accel_channels[] =
+ BMC150_ACCEL_CHANNELS(10);
+static const struct iio_chan_spec bmc150_accel_channels[] =
+ BMC150_ACCEL_CHANNELS(12);
+static const struct iio_chan_spec bma280_accel_channels[] =
+ BMC150_ACCEL_CHANNELS(14);
+
+enum {
+ bmc150,
+ bmi055,
+ bma255,
+ bma250,
+ bma222,
+ bma280,
};

+static const struct bmc150_accel_chip_info bmc150_accel_chip_info_tbl[] = {
+ [bmc150] = {
+ .chip_id = BMC150_ACCEL_CHIP_ID_VAL,
+ .channels = bmc150_accel_channels,
+ .num_channels = ARRAY_SIZE(bmc150_accel_channels),
+ .scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
+ {19122, BMC150_ACCEL_DEF_RANGE_4G},
+ {38344, BMC150_ACCEL_DEF_RANGE_8G},
+ {75590, BMC150_ACCEL_DEF_RANGE_16G} },
+ },
+ [bmi055] = {
+ .chip_id = BMI055_ACCEL_CHIP_ID_VAL,
+ .channels = bmc150_accel_channels,
+ .num_channels = ARRAY_SIZE(bmc150_accel_channels),
+ .scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
+ {19122, BMC150_ACCEL_DEF_RANGE_4G},
+ {38344, BMC150_ACCEL_DEF_RANGE_8G},
+ {75590, BMC150_ACCEL_DEF_RANGE_16G} },
+ },
+ [bma255] = {
+ .chip_id = BMA255_ACCEL_CHIP_ID_VAL,
+ .channels = bmc150_accel_channels,
+ .num_channels = ARRAY_SIZE(bmc150_accel_channels),
+ .scale_table = { {9610, BMC150_ACCEL_DEF_RANGE_2G},
+ {19122, BMC150_ACCEL_DEF_RANGE_4G},
+ {38344, BMC150_ACCEL_DEF_RANGE_8G},
+ {75590, BMC150_ACCEL_DEF_RANGE_16G} },
+ },
+ [bma250] = {
+ .chip_id = BMA250_ACCEL_CHIP_ID_VAL,
+ .channels = bma250_accel_channels,
+ .num_channels = ARRAY_SIZE(bma250_accel_channels),
+ .scale_table = { {38344, BMC150_ACCEL_DEF_RANGE_2G},
+ {75590, BMC150_ACCEL_DEF_RANGE_4G},
+ {153277, BMC150_ACCEL_DEF_RANGE_8G},
+ {306457, BMC150_ACCEL_DEF_RANGE_16G} },
+ },
+ [bma222] = {
+ .chip_id = BMA222_ACCEL_CHIP_ID_VAL,
+ .channels = bma222_accel_channels,
+ .num_channels = ARRAY_SIZE(bma222_accel_channels),
+ .scale_table = { {153277, BMC150_ACCEL_DEF_RANGE_2G},
+ {306457, BMC150_ACCEL_DEF_RANGE_4G},
+ {612915, BMC150_ACCEL_DEF_RANGE_8G},
+ {1225831, BMC150_ACCEL_DEF_RANGE_16G} },
+ },
+ [bma280] = {
+ .chip_id = BMA280_ACCEL_CHIP_ID_VAL,
+ .channels = bma280_accel_channels,
+ .num_channels = ARRAY_SIZE(bma280_accel_channels),
+ .scale_table = { {2392, BMC150_ACCEL_DEF_RANGE_2G},
+ {4785, BMC150_ACCEL_DEF_RANGE_4G},
+ {9581, BMC150_ACCEL_DEF_RANGE_8G},
+ {19152, BMC150_ACCEL_DEF_RANGE_16G} },
+ },
+};
+
static const struct iio_info bmc150_accel_info = {
.attrs = &bmc150_accel_attrs_group,
.read_raw = bmc150_accel_read_raw,
@@ -1040,10 +1134,23 @@ static irqreturn_t bmc150_accel_data_rdy_trig_poll(int irq, void *private)
return IRQ_HANDLED;
}

-static int bmc150_accel_acpi_gpio_probe(struct i2c_client *client,
- struct bmc150_accel_data *data)
+static char *bmc150_accel_match_acpi_device(struct device *dev, int *data)
{
const struct acpi_device_id *id;
+
+ id = acpi_match_device(dev->driver->acpi_match_table, dev);
+
+ if (!id)
+ return NULL;
+
+ *data = (int) id->driver_data;
+
+ return (char *) dev_name(dev);
+}
+
+static int bmc150_accel_gpio_probe(struct i2c_client *client,
+ struct bmc150_accel_data *data)
+{
struct device *dev;
struct gpio_desc *gpio;
int ret;
@@ -1052,17 +1159,11 @@ static int bmc150_accel_acpi_gpio_probe(struct i2c_client *client,
return -EINVAL;

dev = &client->dev;
- if (!ACPI_HANDLE(dev))
- return -ENODEV;
-
- id = acpi_match_device(dev->driver->acpi_match_table, dev);
- if (!id)
- return -ENODEV;

/* data ready gpio interrupt pin */
gpio = devm_gpiod_get_index(dev, BMC150_ACCEL_GPIO_NAME, 0);
if (IS_ERR(gpio)) {
- dev_err(dev, "Failed: acpi gpio get index\n");
+ dev_err(dev, "Failed: gpio get index\n");
return PTR_ERR(gpio);
}

@@ -1083,6 +1184,8 @@ static int bmc150_accel_probe(struct i2c_client *client,
struct bmc150_accel_data *data;
struct iio_dev *indio_dev;
int ret;
+ char *name = NULL;
+ int chip_id = 0;

indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
@@ -1092,6 +1195,16 @@ static int bmc150_accel_probe(struct i2c_client *client,
i2c_set_clientdata(client, indio_dev);
data->client = client;

+ if (id) {
+ name = (char *) id->name;
+ chip_id = id->driver_data;
+ }
+
+ if (ACPI_HANDLE(&client->dev))
+ name = bmc150_accel_match_acpi_device(&client->dev, &chip_id);
+
+ data->chip_info = &bmc150_accel_chip_info_tbl[chip_id];
+
ret = bmc150_accel_chip_init(data);
if (ret < 0)
return ret;
@@ -1099,14 +1212,14 @@ static int bmc150_accel_probe(struct i2c_client *client,
mutex_init(&data->mutex);

indio_dev->dev.parent = &client->dev;
- indio_dev->channels = bmc150_accel_channels;
- indio_dev->num_channels = ARRAY_SIZE(bmc150_accel_channels);
- indio_dev->name = BMC150_ACCEL_DRV_NAME;
+ indio_dev->channels = data->chip_info->channels;
+ indio_dev->num_channels = data->chip_info->num_channels;
+ indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &bmc150_accel_info;

if (client->irq < 0)
- client->irq = bmc150_accel_acpi_gpio_probe(client, data);
+ client->irq = bmc150_accel_gpio_probe(client, data);

if (client->irq >= 0) {
ret = devm_request_threaded_irq(
@@ -1284,14 +1397,24 @@ static const struct dev_pm_ops bmc150_accel_pm_ops = {
};

static const struct acpi_device_id bmc150_accel_acpi_match[] = {
- {"BSBA0150", 0},
- {"BMC150A", 0},
+ {"BSBA0150", bmc150},
+ {"BMC150A", bmc150},
+ {"BMI055A", bmi055},
+ {"BMA0255", bma255},
+ {"BMA0250", bma250},
+ {"BMA0222", bma222},
+ {"BMA0280", bma280},
{ },
};
MODULE_DEVICE_TABLE(acpi, bmc150_accel_acpi_match);

static const struct i2c_device_id bmc150_accel_id[] = {
- {"bmc150_accel", 0},
+ {"bmc150_accel", bmc150},
+ {"bmi055_accel", bmi055},
+ {"bma255", bma255},
+ {"bma250", bma250},
+ {"bma222", bma222},
+ {"bma280", bma280},
{}
};

--
1.9.1