Message-ID: <20150312205832.GA10750@Arch.lan>
Date:	Thu, 12 Mar 2015 21:58:32 +0100
From:	tduszyns@...il.com
To:	Jonathan Cameron <jic23@...nel.org>
Cc:	Tomasz Duszynski <tduszyns@...il.com>, knaack.h@....de,
	lars@...afoo.de, pmeerw@...erw.net, linux-kernel@...r.kernel.org,
	linux-iio@...r.kernel.org
Subject: Re: [PATCH v2] iio: pressure: add support for MS5611 pressure and
 temperature sensor

Hi Jonathan,

On Thu, Mar 12, 2015 at 07:24:48AM +0000, Jonathan Cameron wrote:
> On 11/03/15 20:11, Tomasz Duszynski wrote:
> > Add support for Measurement Specialities MS5611 pressure
> > and temperature sensor.
> >
> > Signed-off-by: Tomasz Duszynski <tduszyns@...il.com>
> Various trivial bits but one big one I missed in the previous
> review (sorry, must have been asleep - unlike now where I haven't
> woken up yet - hmm airports).
>
> spi_write requires the buffer to sit in it's own cacheline.
> (i.e. it requires a dma safe buffer which is not controllable
>  when you use buffers on the stack).
>
> Otherwise, looks good to me.
>
> Jonathan
> > ---
> >
> >  Changes in v2:
> > 	- Fix coding style
> >      	- Document i2c slave addresses
> >      	- Simplify device registration/removal using devm_iio_device_register()
> > 	- Return temperature in mC and pressure in kPa
> >
> >  drivers/iio/pressure/Kconfig       |  27 +++++
> >  drivers/iio/pressure/Makefile      |   3 +
> >  drivers/iio/pressure/ms5611.h      |  44 ++++++++
> >  drivers/iio/pressure/ms5611_core.c | 213 +++++++++++++++++++++++++++++++++++++
> >  drivers/iio/pressure/ms5611_i2c.c  | 126 ++++++++++++++++++++++
> >  drivers/iio/pressure/ms5611_spi.c  | 127 ++++++++++++++++++++++
> >  6 files changed, 540 insertions(+)
> >  create mode 100644 drivers/iio/pressure/ms5611.h
> >  create mode 100644 drivers/iio/pressure/ms5611_core.c
> >  create mode 100644 drivers/iio/pressure/ms5611_i2c.c
> >  create mode 100644 drivers/iio/pressure/ms5611_spi.c
> >
> > diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
> > index a3be537..fa62950 100644
> > --- a/drivers/iio/pressure/Kconfig
> > +++ b/drivers/iio/pressure/Kconfig
> > @@ -52,6 +52,33 @@ config MPL3115
> >            To compile this driver as a module, choose M here: the module
> >            will be called mpl3115.
> >
> > +config MS5611
> > +	tristate "Measurement Specialities MS5611 pressure sensor driver"
> > +	help
> > +	  Say Y here to build support for the Measurement Specialities
> > +	  MS5611 pressure and temperature sensor.
> > +
> > +	  To compile this driver as a module, choose M here: the module will
> > +	  be called ms5611_core.
> > +
> > +config MS5611_I2C
> > +	tristate "support I2C bus connection"
> > +	depends on I2C && MS5611
> > +	help
> > +	  Say Y here to build I2C bus support for MS5611.
> > +
> > +	  To compile this driver as a module, choose M here: the module will
> > +	  be called ms5611_i2c.
> > +
> > +config MS5611_SPI
> > +	tristate "support SPI bus connection"
> > +	depends on SPI_MASTER && MS5611
> > +	help
> > +	  Say Y here to build SPI bus support for MS5611.
> > +
> > +	  To compile this driver as a module, choose M here: the module will
> > +	  be called ms5611_spi.
> > +
> >  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 88011f2..a4f98f8 100644
> > --- a/drivers/iio/pressure/Makefile
> > +++ b/drivers/iio/pressure/Makefile
> > @@ -7,6 +7,9 @@ obj-$(CONFIG_BMP280) += bmp280.o
> >  obj-$(CONFIG_HID_SENSOR_PRESS)   += hid-sensor-press.o
> >  obj-$(CONFIG_MPL115) += mpl115.o
> >  obj-$(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_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/ms5611.h b/drivers/iio/pressure/ms5611.h
> > new file mode 100644
> > index 0000000..099c6cd
> > --- /dev/null
> > +++ b/drivers/iio/pressure/ms5611.h
> > @@ -0,0 +1,44 @@
> > +/*
> > + * MS5611 pressure and temperature sensor driver
> > + *
> > + * Copyright (c) Tomasz Duszynski <tduszyns@...il.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + */
> > +
> > +#ifndef _MS5611_H
> > +#define _MS5611_H
> > +
> > +#include <linux/device.h>
> > +#include <linux/iio/iio.h>
> > +#include <linux/mutex.h>
> > +
> > +#define MS5611_RESET			0x1e
> > +#define MS5611_READ_ADC			0x00
> > +#define MS5611_READ_PROM_WORD		0xA0
> > +#define MS5611_START_TEMP_CONV		0x58
> > +#define MS5611_START_PRESSURE_CONV	0x48
> > +
> > +#define MS5611_CONV_TIME_MIN		9040
> > +#define MS5611_CONV_TIME_MAX		10000
> > +
> > +#define MS5611_PROM_WORDS_NB		8
> > +
> > +struct ms5611_state {
> > +	void *client;
> > +	struct mutex lock;
> > +
> > +	int (*reset)(struct device *dev);
> > +	int (*read_prom_word)(struct device *dev, int index, u16 *word);
> > +	int (*read_adc_temp_and_pressure)(struct device *dev,
> > +					  s32 *temp, s32 *pressure);
> > +
> > +	u16 prom[MS5611_PROM_WORDS_NB];
> > +};
> > +
> > +int ms5611_probe(struct iio_dev *indio_dev, struct device *dev);
> > +
> > +#endif /* _MS5611_H */
> > diff --git a/drivers/iio/pressure/ms5611_core.c b/drivers/iio/pressure/ms5611_core.c
> > new file mode 100644
> > index 0000000..3d34644
> > --- /dev/null
> > +++ b/drivers/iio/pressure/ms5611_core.c
> > @@ -0,0 +1,213 @@
> > +/*
> > + * MS5611 pressure and temperature sensor driver
> > + *
> > + * Copyright (c) Tomasz Duszynski <tduszyns@...il.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * Data sheet:
> > + *  http://www.meas-spec.com/downloads/MS5611-01BA03.pdf
> > + *
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/iio/iio.h>
> > +#include <linux/delay.h>
> > +
> > +#include "ms5611.h"
> > +
> > +static bool ms5611_prom_is_valid(u16 *prom, size_t len)
> > +{
> > +	int i, j;
> > +	uint16_t crc = 0, crc_orig = prom[7] & 0x000F;
> > +
> > +	prom[7] &= 0xFF00;
> > +
> > +	for (i = 0; i < len * 2; i++) {
> > +		if (i % 2 == 1)
> > +			crc ^= prom[i >> 1] & 0x00FF;
> > +		else
> > +			crc ^= prom[i >> 1] >> 8;
> > +
> > +		for (j = 0; j < 8; j++) {
> > +			if (crc & 0x8000)
> > +				crc = (crc << 1) ^ 0x3000;
> > +			else
> > +				crc <<= 1;
> > +		}
> > +	}
> > +
> > +	crc = (crc >> 12) & 0x000F;
> > +	return crc_orig != 0x0000 && crc == crc_orig;
> > +}
> > +
> > +static int ms5611_read_prom(struct iio_dev *indio_dev)
> > +{
> > +	int ret, i;
> > +	struct ms5611_state *st = iio_priv(indio_dev);
> > +
> > +	for (i = 0; i < MS5611_PROM_WORDS_NB; i++) {
> > +		ret = st->read_prom_word(&indio_dev->dev, i, &st->prom[i]);
> > +		if (ret < 0) {
> > +			dev_err(&indio_dev->dev,
> > +				"failed to read prom at %d\n", i);
> > +			return ret;
> > +		}
> > +	}
> > +
> > +	if (!ms5611_prom_is_valid(st->prom, MS5611_PROM_WORDS_NB)) {
> > +		dev_err(&indio_dev->dev, "PROM integrity check failed\n");
> > +		return -ENODEV;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev,
> > +					 s32 *temp, s32 *pressure)
> > +{
> > +	int ret;
> > +	s32 t, p;
> > +	s64 off, sens, dt;
> > +	struct ms5611_state *st = iio_priv(indio_dev);
> > +
> > +	ret = st->read_adc_temp_and_pressure(&indio_dev->dev, &t, &p);
> > +	if (ret < 0) {
> > +		dev_err(&indio_dev->dev,
> > +			"failed to read temperature and pressure\n");
> > +		return ret;
> > +	}
> > +
> > +	dt = t - (st->prom[5] << 8);
> > +	off = ((s64)st->prom[2] << 16) + ((st->prom[4] * dt) >> 7);
> > +	sens = ((s64)st->prom[1] << 15) + ((st->prom[3] * dt) >> 8);
> > +
> > +	t = 2000 + ((st->prom[6] * dt) >> 23);
> > +	if (t < 2000) {
> > +		s64 off2, sens2, t2;
> > +
> > +		t2 = (dt * dt) >> 31;
> > +		off2 = (5 * (t - 2000) * (t - 2000)) >> 1;
> > +		sens2 = off2 >> 1;
> > +
> > +		if (t < -1500) {
> > +			s64 tmp = (t + 1500) * (t + 1500);
> > +
> > +			off2 += 7 * tmp;
> > +			sens2 += (11 * tmp) >> 1;
> > +		}
> > +
> > +		t -= t2;
> > +		off -= off2;
> > +		sens -= sens2;
> > +	}
> > +
> > +	*temp = t;
> > +	*pressure = (((p * sens) >> 21) - off) >> 15;
> > +
> > +	return 0;
> > +}
> > +
> > +static int ms5611_reset(struct iio_dev *indio_dev)
> > +{
> > +	int ret;
> > +	struct ms5611_state *st = iio_priv(indio_dev);
> > +
> > +	ret = st->reset(&indio_dev->dev);
> > +	if (ret < 0) {
> > +		dev_err(&indio_dev->dev, "failed to reset device\n");
> > +		return ret;
> > +	}
> > +
> > +	usleep_range(3000, 4000);
> > +	return 0;
> > +}
> > +
> > +static int ms5611_read_raw(struct iio_dev *indio_dev,
> > +			   struct iio_chan_spec const *chan,
> > +			   int *val, int *val2, long mask)
> > +{
> > +	int ret;
> > +	s32 temp, pressure;
> > +	struct ms5611_state *st = iio_priv(indio_dev);
> > +
> > +	switch (mask) {
> > +	case IIO_CHAN_INFO_PROCESSED:
> > +		mutex_lock(&st->lock);
> > +		ret = ms5611_read_temp_and_pressure(indio_dev,
> > +						    &temp, &pressure);
> > +		mutex_unlock(&st->lock);
> > +		if (ret < 0)
> > +			return ret;
> > +
> > +		switch (chan->type) {
> > +		case IIO_TEMP:
> > +			*val = temp * 10;
> > +			return IIO_VAL_INT;
> > +		case IIO_PRESSURE:
> > +			*val = pressure / 1000;
> > +			*val2 = (pressure % 1000) * 1000;
> > +			return IIO_VAL_INT_PLUS_MICRO;
> > +		default:
> > +			return -EINVAL;
> > +		}
> > +	}
> > +
> > +	return -EINVAL;
> > +}
> > +
> > +static const struct iio_chan_spec ms5611_channels[] = {
> > +	{
> > +		.type = IIO_PRESSURE,
> > +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> > +			BIT(IIO_CHAN_INFO_SCALE)
> > +	},
> > +	{
> > +		.type = IIO_TEMP,
> > +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> > +			BIT(IIO_CHAN_INFO_SCALE)
> > +	}
> > +};
> > +
> > +static const struct iio_info ms5611_info = {
> > +	.read_raw = &ms5611_read_raw,
> > +	.driver_module = THIS_MODULE,
> > +};
> > +
> > +static int ms5611_init(struct iio_dev *indio_dev)
> > +{
> > +	int ret;
> > +
> > +	ret = ms5611_reset(indio_dev);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return ms5611_read_prom(indio_dev);
> > +}
> > +
> > +int ms5611_probe(struct iio_dev *indio_dev, struct device *dev)
> > +{
> > +	int ret;
> > +	struct ms5611_state *st = iio_priv(indio_dev);
> > +
> > +	mutex_init(&st->lock);
> > +	indio_dev->dev.parent = dev;
> > +	indio_dev->name = dev->driver->name;
> > +	indio_dev->info = &ms5611_info;
> > +	indio_dev->channels = ms5611_channels;
> > +	indio_dev->num_channels = ARRAY_SIZE(ms5611_channels);
> > +	indio_dev->modes = INDIO_DIRECT_MODE;
> > +
> > +	ret = ms5611_init(indio_dev);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	return devm_iio_device_register(dev, indio_dev);
> > +}
> > +EXPORT_SYMBOL(ms5611_probe);
> > +
> > +MODULE_AUTHOR("Tomasz Duszynski <tduszyns@...il.com>");
> > +MODULE_DESCRIPTION("MS5611 core driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/iio/pressure/ms5611_i2c.c b/drivers/iio/pressure/ms5611_i2c.c
> > new file mode 100644
> > index 0000000..4a700bd
> > --- /dev/null
> > +++ b/drivers/iio/pressure/ms5611_i2c.c
> > @@ -0,0 +1,126 @@
> > +/*
> > + * MS5611 pressure and temperature sensor driver (I2C bus)
> > + *
> > + * Copyright (c) Tomasz Duszynski <tduszyns@...il.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * 7-bit I2C slave addresses:
> > + *
> > + * 0x77 (CSB pin low)
> > + * 0x76 (CSB pin high)
> > + *
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +
> > +#include "ms5611.h"
> > +
> > +static int ms5611_reset(struct device *dev)
> > +{
> > +	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
> > +
> > +	return i2c_smbus_write_byte(st->client, MS5611_RESET);
> > +}
> > +
> > +static int ms5611_read_prom_word(struct device *dev, int index, u16 *word)
> > +{
> > +	int ret;
> > +	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
> > +
> > +	ret = i2c_smbus_read_word_swapped(st->client,
> > +			MS5611_READ_PROM_WORD + (index << 1));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	*word = ret;
> > +	return 0;
> > +}
> > +
> > +static int ms5611_read_adc(struct ms5611_state *st, s32 *val)
> > +{
> > +	int ret;
> > +	u8 buf[3];
> > +
> > +	ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
> > +					    3, buf);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
> blank line here (and all through the driver before return statements)
> It's trivial, but it does make them ever so slightly easier to read!.
OK
> > +	return 0;
> > +}
> > +
> > +static int ms5611_read_adc_temp_and_pressure(struct device *dev,
> > +					     s32 *temp, s32 *pressure)
> > +{
> > +	int ret;
> > +	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
> > +
> > +	ret = i2c_smbus_write_byte(st->client, MS5611_START_TEMP_CONV);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
> > +
> > +	ret = ms5611_read_adc(st, temp);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = i2c_smbus_write_byte(st->client, MS5611_START_PRESSURE_CONV);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
> > +
> > +	return ms5611_read_adc(st, pressure);
> > +}
> > +
> > +static int ms5611_i2c_probe(struct i2c_client *client,
> > +			    const struct i2c_device_id *id)
> > +{
> > +	struct ms5611_state *st;
> > +	struct iio_dev *indio_dev;
> > +
> > +	if (!i2c_check_functionality(client->adapter,
> > +				     I2C_FUNC_SMBUS_WRITE_BYTE |
> > +				     I2C_FUNC_SMBUS_READ_WORD_DATA |
> > +				     I2C_FUNC_SMBUS_READ_I2C_BLOCK))
> > +		return -ENODEV;
> > +
> > +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
> > +	if (!indio_dev)
> > +		return -ENOMEM;
> > +
> > +	st = iio_priv(indio_dev);
> > +	st->reset = ms5611_reset;
> I know the scope of the definitions ensures we get the right ones, but
> I would personally prefer these functions to having naming that makes
> it clear that these are the i2c versions  ms5611_i2c_read_prom_word etc
> perhaps?
Right. Will be fixed in the next patch.
> > +	st->read_prom_word = ms5611_read_prom_word;
> > +	st->read_adc_temp_and_pressure = ms5611_read_adc_temp_and_pressure;
> > +	st->client = client;
> > +
> > +	return ms5611_probe(indio_dev, &client->dev);
> > +}
> > +
> > +static const struct i2c_device_id ms5611_id[] = {
> > +	{ "ms5611", 0 },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, ms5611_id);
> > +
> > +static struct i2c_driver ms5611_driver = {
> > +	.driver = {
> > +		.name = "ms5611",
> > +		.owner = THIS_MODULE,
> > +	},
> > +	.id_table = ms5611_id,
> > +	.probe = ms5611_i2c_probe,
> > +};
> > +module_i2c_driver(ms5611_driver);
> > +
> > +MODULE_AUTHOR("Tomasz Duszynski <tduszyns@...il.com>");
> > +MODULE_DESCRIPTION("MS5611 i2c driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/iio/pressure/ms5611_spi.c b/drivers/iio/pressure/ms5611_spi.c
> > new file mode 100644
> > index 0000000..08a8ab4
> > --- /dev/null
> > +++ b/drivers/iio/pressure/ms5611_spi.c
> > @@ -0,0 +1,127 @@
> > +/*
> > + * MS5611 pressure and temperature sensor driver (SPI bus)
> > + *
> > + * Copyright (c) Tomasz Duszynski <tduszyns@...il.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + */
> > +
> > +#include <linux/delay.h>
> > +#include <linux/module.h>
> > +#include <linux/spi/spi.h>
> > +
> > +#include "ms5611.h"
> > +
> > +static int ms5611_reset(struct device *dev)
> > +{
> > +	u8 cmd = MS5611_RESET;
> > +	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
> > +
> > +	return spi_write(st->client, &cmd, 1);
> > +}
> > +
> > +static int ms5611_read_prom_word(struct device *dev, int index, u16 *word)
> > +{
> > +	int ret;
> > +	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
> > +
> > +	ret = spi_w8r16be(st->client, MS5611_READ_PROM_WORD + (index << 1));
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	*word = ret;
> Convention puts a blank line before the return statement.
> (Another trivial point ;)
OK
> > +	return 0;
> > +}
> > +
> > +static int ms5611_read_adc(struct device *dev, s32 *val)
> > +{
> > +	int ret;
> > +	u8 buf[3];
> > +	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
> > +
> > +	buf[0] = MS5611_READ_ADC;
> Trivial suggestion:
> Could use c99 style initialization to tidy this up a tiny bit.
> u8 buf[3] = { MS5611_READ_ADC };
>
OK
> > +
> > +	ret = spi_write_then_read(st->client, buf, 1, buf, 3);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	*val = (buf[0] << 16) | (buf[1] << 8) | buf[2];
> convention would put a blank line here.
OK
> > +	return 0;
> > +}
> > +
> > +static int ms5611_read_adc_temp_and_pressure(struct device *dev,
> > +					     s32 *temp, s32 *pressure)
> > +{
> > +	u8 cmd;
> > +	int ret;
> > +	struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));
> > +
> > +	cmd = MS5611_START_TEMP_CONV;
> > +	ret = spi_write(st->client, &cmd, 1);
>
> The buffer cmd is not in it's own cacheline which is a bug as
> the spi subsystem can pass this buffer directly to DMA engines.
> To avoid this, you need to force the buffer to be on the heap.
> Standard trick is to use the __cacheline_aligned magic to put this
> at the end of your state structure.  With this in mind IIO will
> also always cacheline align the private data.
>
> Note the spi_write_then_read actually doesn't need this as it
> copies data into new buffers and the result back again.
Thanks for pointing this out. I will look more closely at spi subsystem
implementation to get better understanding of this.
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
> > +
> > +	ret = ms5611_read_adc(dev, temp);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	cmd = MS5611_START_PRESSURE_CONV;
> > +	ret = spi_write(st->client, &cmd, 1);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);
> > +
> > +	return ms5611_read_adc(dev, pressure);
> > +}
> > +
> > +static int ms5611_spi_probe(struct spi_device *spi)
> > +{
> > +	int ret;
> > +	struct ms5611_state *st;
> > +	struct iio_dev *indio_dev;
> > +
> > +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> > +	if (!indio_dev)
> > +		return -ENOMEM;
> > +
> > +	spi->mode = SPI_MODE_0;
> > +	spi->max_speed_hz = 20000000;
> > +	spi->bits_per_word = 8;
> > +	ret = spi_setup(spi);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	st = iio_priv(indio_dev);
> > +	st->reset = ms5611_reset;
> > +	st->read_prom_word = ms5611_read_prom_word;
> > +	st->read_adc_temp_and_pressure = ms5611_read_adc_temp_and_pressure;
> > +	st->client = spi;
> > +
> > +	return ms5611_probe(indio_dev, &spi->dev);
> > +}
> > +
> > +static const struct spi_device_id ms5611_id[] = {
> > +	{ "ms5611", 0 },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(spi, ms5611_id);
> > +
> > +static struct spi_driver ms5611_driver = {
> > +	.driver = {
> > +		.name = "ms5611",
> > +		.owner = THIS_MODULE,
> > +	},
> > +	.id_table = ms5611_id,
> > +	.probe = ms5611_spi_probe,
> > +};
> > +module_spi_driver(ms5611_driver);
> > +
> > +MODULE_AUTHOR("Tomasz Duszynski <tduszyns@...il.com>");
> > +MODULE_DESCRIPTION("MS5611 spi driver");
> > +MODULE_LICENSE("GPL v2");
> > --
> > 2.3.1
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-iio" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
>
Thanks for review!
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