Re: [PATCH v4 5/7] Add ms5637 meas-spec driver support

[Jonathan Cameron <jic23@kernel.org>]

On 01/10/15 15:13, Ludovic Tancerel wrote:
> Support for MS5637 temperature & pressure sensor
> 
> Signed-off-by: Ludovic Tancerel <ludovic.tancerel@maplehightech.com>
Applied,
> ---
>  drivers/iio/pressure/Kconfig  |  11 +++
>  drivers/iio/pressure/Makefile |   1 +
>  drivers/iio/pressure/ms5637.c | 186 ++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 198 insertions(+)
>  create mode 100644 drivers/iio/pressure/ms5637.c
> 
> diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
> index fa62950..dd12d52 100644
> --- a/drivers/iio/pressure/Kconfig
> +++ b/drivers/iio/pressure/Kconfig
> @@ -79,6 +79,17 @@ config MS5611_SPI
>  	  To compile this driver as a module, choose M here: the module will
>  	  be called ms5611_spi.
>  
> +config MS5637
> +	tristate "Measurement Specialties MS5637 pressure & temperature sensor"
> +	depends on I2C
> +        select IIO_MS_SENSORS_I2C
> +	help
> +	  If you say yes here you get support for the Measurement Specialties
> +	  MS5637 pressure and temperature sensor.
> +
> +	  This driver can also be built as a module. If so, the module will
> +	  be called ms5637.
> +
>  config IIO_ST_PRESS
>  	tristate "STMicroelectronics pressure sensor Driver"
>  	depends on (I2C || SPI_MASTER) && SYSFS
> diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
> index a4f98f8..46571c96 100644
> --- a/drivers/iio/pressure/Makefile
> +++ b/drivers/iio/pressure/Makefile
> @@ -10,6 +10,7 @@ obj-$(CONFIG_MPL3115) += mpl3115.o
>  obj-$(CONFIG_MS5611) += ms5611_core.o
>  obj-$(CONFIG_MS5611_I2C) += ms5611_i2c.o
>  obj-$(CONFIG_MS5611_SPI) += ms5611_spi.o
> +obj-$(CONFIG_MS5637) += ms5637.o
>  obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o
>  st_pressure-y := st_pressure_core.o
>  st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o
> diff --git a/drivers/iio/pressure/ms5637.c b/drivers/iio/pressure/ms5637.c
> new file mode 100644
> index 0000000..e3ad9d3
> --- /dev/null
> +++ b/drivers/iio/pressure/ms5637.c
> @@ -0,0 +1,186 @@
> +/*
> + * ms5637.c - Support for Measurement-Specialties ms5637
> + *            pressure & temperature sensor
> + *
> + * Copyright (c) 2015 Measurement-Specialties
> + *
> + * Licensed under the GPL-2.
> + *
> + * (7-bit I2C slave address 0x76)
> + *
> + * Datasheet:
> + *  http://www.meas-spec.com/downloads/MS5637-02BA03.pdf
> + */
> +#include <linux/init.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/stat.h>
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +#include <linux/mutex.h>
> +
> +#include "../common/ms_sensors/ms_sensors_i2c.h"
> +
> +static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
> +/* String copy of the above const for readability purpose */
> +static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
> +
> +static int ms5637_read_raw(struct iio_dev *indio_dev,
> +			   struct iio_chan_spec const *channel, int *val,
> +			   int *val2, long mask)
> +{
> +	int ret;
> +	int temperature;
> +	unsigned int pressure;
> +	struct ms_tp_dev *dev_data = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_PROCESSED:
> +		ret = ms_sensors_read_temp_and_pressure(dev_data,
> +							&temperature,
> +							&pressure);
> +		if (ret)
> +			return ret;
> +
> +		switch (channel->type) {
> +		case IIO_TEMP:	/* in milli °C */
> +			*val = temperature;
> +
> +			return IIO_VAL_INT;
> +		case IIO_PRESSURE:	/* in kPa */
> +			*val = pressure / 1000;
> +			*val2 = (pressure % 1000) * 1000;
> +
> +			return IIO_VAL_INT_PLUS_MICRO;
> +		default:
> +			return -EINVAL;
> +		}
> +	case IIO_CHAN_INFO_SAMP_FREQ:
> +		*val = ms5637_samp_freq[dev_data->res_index];
> +
> +		return IIO_VAL_INT;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int ms5637_write_raw(struct iio_dev *indio_dev,
> +			    struct iio_chan_spec const *chan,
> +			    int val, int val2, long mask)
> +{
> +	struct ms_tp_dev *dev_data = iio_priv(indio_dev);
> +	int i;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_SAMP_FREQ:
> +		i = ARRAY_SIZE(ms5637_samp_freq);
> +		while (i-- > 0)
> +			if (val == ms5637_samp_freq[i])
> +				break;
> +		if (i < 0)
> +			return -EINVAL;
> +		dev_data->res_index = i;
> +
> +		return 0;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static const struct iio_chan_spec ms5637_channels[] = {
> +	{
> +		.type = IIO_TEMP,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> +		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
> +	},
> +	{
> +		.type = IIO_PRESSURE,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
> +		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
> +	}
> +};
> +
> +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
> +
> +static struct attribute *ms5637_attributes[] = {
> +	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
> +	NULL,
> +};
> +
> +static const struct attribute_group ms5637_attribute_group = {
> +	.attrs = ms5637_attributes,
> +};
> +
> +static const struct iio_info ms5637_info = {
> +	.read_raw = ms5637_read_raw,
> +	.write_raw = ms5637_write_raw,
> +	.attrs = &ms5637_attribute_group,
> +	.driver_module = THIS_MODULE,
> +};
> +
> +static int ms5637_probe(struct i2c_client *client,
> +			const struct i2c_device_id *id)
> +{
> +	struct ms_tp_dev *dev_data;
> +	struct iio_dev *indio_dev;
> +	int ret;
> +
> +	if (!i2c_check_functionality(client->adapter,
> +				     I2C_FUNC_SMBUS_READ_WORD_DATA |
> +				     I2C_FUNC_SMBUS_WRITE_BYTE |
> +				     I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
> +		dev_err(&client->dev,
> +			"Adapter does not support some i2c transaction\n");
> +		return -ENODEV;
> +	}
> +
> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	dev_data = iio_priv(indio_dev);
> +	dev_data->client = client;
> +	dev_data->res_index = 5;
> +	mutex_init(&dev_data->lock);
> +
> +	indio_dev->info = &ms5637_info;
> +	indio_dev->name = id->name;
> +	indio_dev->dev.parent = &client->dev;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->channels = ms5637_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
> +
> +	i2c_set_clientdata(client, indio_dev);
> +
> +	ret = ms_sensors_reset(client, 0x1E, 3000);
> +	if (ret)
> +		return ret;
> +
> +	ret = ms_sensors_tp_read_prom(dev_data);
> +	if (ret)
> +		return ret;
> +
> +	return devm_iio_device_register(&client->dev, indio_dev);
> +}
> +
> +static const struct i2c_device_id ms5637_id[] = {
> +	{"ms5637", 0},
> +	{}
> +};
> +
> +static struct i2c_driver ms5637_driver = {
> +	.probe = ms5637_probe,
> +	.id_table = ms5637_id,
> +	.driver = {
> +		   .name = "ms5637"
> +		   },
> +};
> +
> +module_i2c_driver(ms5637_driver);
> +
> +MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
> +MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
> +MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
> +MODULE_LICENSE("GPL v2");
>