Re: [PATCH v5 3/3] iio: accel: BMC150: add support for other Bosch chips

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 02/09/14 10:30, Laurentiu Palcu wrote:
> 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
> BMA222E - 8 bit resolution
> BMA250E - 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;
>  * rename bmc150_scale_info struct member 'range' to 'reg_range' to be
>    consistent with the naming convention used elsewhere in the driver
>    and declare it u8, instead of int;
>  * change CONFIG description to list all supported chips;
> 
> Signed-off-by: Laurentiu Palcu <laurentiu.palcu@xxxxxxxxx>
Looks fine to me, though I'm not really in a fit state to review right now.
Srinivas, do you want to give an Ack?
> ---
> 
> Changes in v5:
>  * addressed Joe's suggestion to rewrite a small portion of the code to make it
>    more readable;
>  * changed the CONFIG description according to Srinivas's advise;
> 
> Changes in v4:
>  * address Peter's comments: see 3rd bullet in the commit's message. As a result, do
>    some re-indentation to make lines fit 80 chars;
> 
> Changes in v3:
>  * remove the chip id macros since they were not used anywhere else and put the id
>    values directly in the chip info table;
>  * fix the unnecessary casting from const char * to char * and back;
> 
> laurentiu
> 
>  drivers/iio/accel/Kconfig        |   4 +-
>  drivers/iio/accel/bmc150-accel.c | 234 +++++++++++++++++++++++++++++----------
>  2 files changed, 178 insertions(+), 60 deletions(-)
> 
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index 01b857e..01a2151 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -23,7 +23,9 @@ config BMC150_ACCEL
>  	select IIO_BUFFER
>  	select IIO_TRIGGERED_BUFFER
>  	help
> -	  Say yes here to build support for the Bosch BMC150 accelerometer.
> +	  Say yes here to build support for the following Bosch accelerometers:
> +	  BMC150, BMI055, BMA250E, BMA222E, BMA255, BMA280.
> +
>  	  Currently this only supports the device via an i2c interface.
>  
>  	  This is a combo module with both accelerometer and magnetometer.
> diff --git a/drivers/iio/accel/bmc150-accel.c b/drivers/iio/accel/bmc150-accel.c
> index 0e6566a..22c096c 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
> + *  - BMA250E
> + *  - BMA222E
> + *  - BMA280
> + *
>   * Copyright (c) 2014, Intel Corporation.
>   *
>   * This program is free software; you can redistribute it and/or modify it
> @@ -34,7 +41,6 @@
>  #define BMC150_ACCEL_GPIO_NAME			"bmc150_accel_int"
>  
>  #define BMC150_ACCEL_REG_CHIP_ID		0x00
> -#define BMC150_ACCEL_CHIP_ID_VAL		0xFA
>  
>  #define BMC150_ACCEL_REG_INT_STATUS_2		0x0B
>  #define BMC150_ACCEL_ANY_MOTION_MASK		0x07
> @@ -126,6 +132,18 @@ enum bmc150_power_modes {
>  	BMC150_ACCEL_SLEEP_MODE_SUSPEND = 0x04,
>  };
>  
> +struct bmc150_scale_info {
> +	int scale;
> +	u8 reg_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 +158,7 @@ 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 {
> @@ -168,16 +187,8 @@ 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;
> +	u8 reg_value;
>  } bmc150_accel_sleep_value_table[] = { {0, 0},
>  				       {500, BMC150_ACCEL_SLEEP_500_MICRO},
>  				       {1000, BMC150_ACCEL_SLEEP_1_MS},
> @@ -267,7 +278,7 @@ 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 +552,19 @@ 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->client,
> +				     BMC150_ACCEL_REG_PMU_RANGE,
> +				     data->chip_info->scale_table[i].reg_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].reg_range;
>  			return 0;
>  		}
>  	}
> @@ -580,10 +591,12 @@ 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 +613,8 @@ 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 +639,7 @@ 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;
>  		}
> @@ -646,13 +658,13 @@ static int bmc150_accel_read_raw(struct iio_dev *indio_dev,
>  		case IIO_ACCEL:
>  		{
>  			int i;
> +			const struct bmc150_scale_info *si;
> +			int st_size = ARRAY_SIZE(data->chip_info->scale_table);
>  
> -			for (i = 0; i < ARRAY_SIZE(bmc150_accel_scale_table);
> -									 ++i) {
> -				if (bmc150_accel_scale_table[i].range ==
> -								data->range) {
> -					*val2 =
> -					bmc150_accel_scale_table[i].scale;
> +			for (i = 0; i < st_size; ++i) {
> +				si = &data->chip_info->scale_table[i];
> +				if (si->reg_range == data->range) {
> +					*val2 = si->scale;
>  					return IIO_VAL_INT_PLUS_MICRO;
>  				}
>  			}
> @@ -840,7 +852,7 @@ 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,					\
> @@ -850,26 +862,101 @@ 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,
> +#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 bma222e_accel_channels[] =
> +	BMC150_ACCEL_CHANNELS(8);
> +static const struct iio_chan_spec bma250e_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,
> +	bma250e,
> +	bma222e,
> +	bma280,
> +};
> +
> +static const struct bmc150_accel_chip_info bmc150_accel_chip_info_tbl[] = {
> +	[bmc150] = {
> +		.chip_id = 0xFA,
> +		.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},
> +				 {76590, BMC150_ACCEL_DEF_RANGE_16G} },
> +	},
> +	[bmi055] = {
> +		.chip_id = 0xFA,
> +		.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},
> +				 {76590, BMC150_ACCEL_DEF_RANGE_16G} },
> +	},
> +	[bma255] = {
> +		.chip_id = 0xFA,
> +		.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},
> +				 {76590, BMC150_ACCEL_DEF_RANGE_16G} },
> +	},
> +	[bma250e] = {
> +		.chip_id = 0xF9,
> +		.channels = bma250e_accel_channels,
> +		.num_channels = ARRAY_SIZE(bma250e_accel_channels),
> +		.scale_table = { {38344, BMC150_ACCEL_DEF_RANGE_2G},
> +				 {76590, BMC150_ACCEL_DEF_RANGE_4G},
> +				 {153277, BMC150_ACCEL_DEF_RANGE_8G},
> +				 {306457, BMC150_ACCEL_DEF_RANGE_16G} },
> +	},
> +	[bma222e] = {
> +		.chip_id = 0xF8,
> +		.channels = bma222e_accel_channels,
> +		.num_channels = ARRAY_SIZE(bma222e_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 = 0xFB,
> +		.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} },
>  	},
> -	BMC150_ACCEL_CHANNEL(X),
> -	BMC150_ACCEL_CHANNEL(Y),
> -	BMC150_ACCEL_CHANNEL(Z),
> -	IIO_CHAN_SOFT_TIMESTAMP(3),
>  };
>  
>  static const struct iio_info bmc150_accel_info = {
> @@ -1040,10 +1127,23 @@ 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 const 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 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 +1152,11 @@ 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 +1177,8 @@ static int bmc150_accel_probe(struct i2c_client *client,
>  	struct bmc150_accel_data *data;
>  	struct iio_dev *indio_dev;
>  	int ret;
> +	const char *name = NULL;
> +	int chip_id = 0;
>  
>  	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
>  	if (!indio_dev)
> @@ -1092,6 +1188,16 @@ static int bmc150_accel_probe(struct i2c_client *client,
>  	i2c_set_clientdata(client, indio_dev);
>  	data->client = client;
>  
> +	if (id) {
> +		name = 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 +1205,14 @@ 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 +1390,24 @@ 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},
> +	{"BMA250E",	bma250e},
> +	{"BMA222E",	bma222e},
> +	{"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},
> +	{"bma250e",		bma250e},
> +	{"bma222e",		bma222e},
> +	{"bma280",		bma280},
>  	{}
>  };
>  
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-iio" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Input]     [Linux Kernel]     [Linux SCSI]     [X.org]

  Powered by Linux