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Date: Sat, 6 Feb 2016 18:18:42 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Daniel Baluta <daniel.baluta@...el.com>
Cc: knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
lucas.demarchi@...el.com
Subject: Re: [PATCH v3 2/2] iio: pressure: ms5611: Add triggered buffer
support
On 03/02/16 16:50, Daniel Baluta wrote:
> This will be used together with an external trigger (e.g hrtimer
> based software trigger).
>
> Signed-off-by: Daniel Baluta <daniel.baluta@...el.com>
Applied to the togreg branch of iio.git - initially pushed out as testing
for the autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/iio/pressure/Kconfig | 1 +
> drivers/iio/pressure/ms5611.h | 1 +
> drivers/iio/pressure/ms5611_core.c | 74 ++++++++++++++++++++++++++++++++++++--
> drivers/iio/pressure/ms5611_i2c.c | 7 ++++
> drivers/iio/pressure/ms5611_spi.c | 8 +++++
> 5 files changed, 89 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
> index cf03a43..f15f66d 100644
> --- a/drivers/iio/pressure/Kconfig
> +++ b/drivers/iio/pressure/Kconfig
> @@ -69,6 +69,7 @@ config MPL3115
>
> config MS5611
> tristate "Measurement Specialties MS5611 pressure sensor driver"
> + select IIO_TRIGGERED_BUFFER
> help
> Say Y here to build support for the Measurement Specialties
> MS5611, MS5607 pressure and temperature sensors.
> diff --git a/drivers/iio/pressure/ms5611.h b/drivers/iio/pressure/ms5611.h
> index 23b93c7..2d70dd6 100644
> --- a/drivers/iio/pressure/ms5611.h
> +++ b/drivers/iio/pressure/ms5611.h
> @@ -52,5 +52,6 @@ struct ms5611_state {
> };
>
> int ms5611_probe(struct iio_dev *indio_dev, struct device *dev, int type);
> +int ms5611_remove(struct iio_dev *indio_dev);
>
> #endif /* _MS5611_H */
> diff --git a/drivers/iio/pressure/ms5611_core.c b/drivers/iio/pressure/ms5611_core.c
> index 6cf0e55..c7885f0c 100644
> --- a/drivers/iio/pressure/ms5611_core.c
> +++ b/drivers/iio/pressure/ms5611_core.c
> @@ -17,6 +17,9 @@
> #include <linux/iio/iio.h>
> #include <linux/delay.h>
>
> +#include <linux/iio/buffer.h>
> +#include <linux/iio/triggered_buffer.h>
> +#include <linux/iio/trigger_consumer.h>
> #include "ms5611.h"
>
> static bool ms5611_prom_is_valid(u16 *prom, size_t len)
> @@ -173,6 +176,28 @@ static int ms5611_reset(struct iio_dev *indio_dev)
> return 0;
> }
>
> +static irqreturn_t ms5611_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *indio_dev = pf->indio_dev;
> + struct ms5611_state *st = iio_priv(indio_dev);
> + s32 buf[4]; /* s32 (pressure) + s32 (temp) + 2 * s32 (timestamp) */
> + int ret;
> +
> + mutex_lock(&st->lock);
> + ret = ms5611_read_temp_and_pressure(indio_dev, &buf[1], &buf[0]);
> + mutex_unlock(&st->lock);
> + if (ret < 0)
> + goto err;
> +
> + iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns());
> +
> +err:
> + iio_trigger_notify_done(indio_dev->trig);
> +
> + return IRQ_HANDLED;
> +}
> +
> static int ms5611_read_raw(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan,
> int *val, int *val2, long mask)
> @@ -218,6 +243,8 @@ static int ms5611_read_raw(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> +static const unsigned long ms5611_scan_masks[] = {0x3, 0};
> +
> static struct ms5611_chip_info chip_info_tbl[] = {
> [MS5611] = {
> .temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate,
> @@ -232,12 +259,27 @@ static const struct iio_chan_spec ms5611_channels[] = {
> .type = IIO_PRESSURE,
> .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> BIT(IIO_CHAN_INFO_SCALE),
> + .scan_index = 0,
> + .scan_type = {
> + .sign = 's',
> + .realbits = 32,
> + .storagebits = 32,
> + .endianness = IIO_CPU,
> + },
> },
> {
> .type = IIO_TEMP,
> .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
> BIT(IIO_CHAN_INFO_SCALE),
> - }
> + .scan_index = 1,
> + .scan_type = {
> + .sign = 's',
> + .realbits = 32,
> + .storagebits = 32,
> + .endianness = IIO_CPU,
> + },
> + },
> + IIO_CHAN_SOFT_TIMESTAMP(2),
> };
>
> static const struct iio_info ms5611_info = {
> @@ -269,15 +311,43 @@ int ms5611_probe(struct iio_dev *indio_dev, struct device *dev, int type)
> indio_dev->channels = ms5611_channels;
> indio_dev->num_channels = ARRAY_SIZE(ms5611_channels);
> indio_dev->modes = INDIO_DIRECT_MODE;
> + indio_dev->available_scan_masks = ms5611_scan_masks;
>
> ret = ms5611_init(indio_dev);
> if (ret < 0)
> return ret;
>
> - return devm_iio_device_register(dev, indio_dev);
> + ret = iio_triggered_buffer_setup(indio_dev, NULL,
> + ms5611_trigger_handler, NULL);
> + if (ret < 0) {
> + dev_err(dev, "iio triggered buffer setup failed\n");
> + return ret;
> + }
> +
> + ret = iio_device_register(indio_dev);
> + if (ret < 0) {
> + dev_err(dev, "unable to register iio device\n");
> + goto err_buffer_cleanup;
> + }
> +
> + return 0;
> +
> +err_buffer_cleanup:
> + iio_triggered_buffer_cleanup(indio_dev);
> +
> + return ret;
> }
> EXPORT_SYMBOL(ms5611_probe);
>
> +int ms5611_remove(struct iio_dev *indio_dev)
> +{
> + iio_device_unregister(indio_dev);
> + iio_triggered_buffer_cleanup(indio_dev);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(ms5611_remove);
> +
> 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
> index 245797d..42706a8 100644
> --- a/drivers/iio/pressure/ms5611_i2c.c
> +++ b/drivers/iio/pressure/ms5611_i2c.c
> @@ -99,6 +99,7 @@ static int ms5611_i2c_probe(struct i2c_client *client,
> return -ENOMEM;
>
> st = iio_priv(indio_dev);
> + i2c_set_clientdata(client, indio_dev);
> st->reset = ms5611_i2c_reset;
> st->read_prom_word = ms5611_i2c_read_prom_word;
> st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
> @@ -107,6 +108,11 @@ static int ms5611_i2c_probe(struct i2c_client *client,
> return ms5611_probe(indio_dev, &client->dev, id->driver_data);
> }
>
> +static int ms5611_i2c_remove(struct i2c_client *client)
> +{
> + return ms5611_remove(i2c_get_clientdata(client));
> +}
> +
> static const struct i2c_device_id ms5611_id[] = {
> { "ms5611", MS5611 },
> { "ms5607", MS5607 },
> @@ -120,6 +126,7 @@ static struct i2c_driver ms5611_driver = {
> },
> .id_table = ms5611_id,
> .probe = ms5611_i2c_probe,
> + .remove = ms5611_i2c_remove,
> };
> module_i2c_driver(ms5611_driver);
>
> diff --git a/drivers/iio/pressure/ms5611_spi.c b/drivers/iio/pressure/ms5611_spi.c
> index aaa0c4b..c4bf4e8 100644
> --- a/drivers/iio/pressure/ms5611_spi.c
> +++ b/drivers/iio/pressure/ms5611_spi.c
> @@ -90,6 +90,8 @@ static int ms5611_spi_probe(struct spi_device *spi)
> if (!indio_dev)
> return -ENOMEM;
>
> + spi_set_drvdata(spi, indio_dev);
> +
> spi->mode = SPI_MODE_0;
> spi->max_speed_hz = 20000000;
> spi->bits_per_word = 8;
> @@ -107,6 +109,11 @@ static int ms5611_spi_probe(struct spi_device *spi)
> spi_get_device_id(spi)->driver_data);
> }
>
> +static int ms5611_spi_remove(struct spi_device *spi)
> +{
> + return ms5611_remove(spi_get_drvdata(spi));
> +}
> +
> static const struct spi_device_id ms5611_id[] = {
> { "ms5611", MS5611 },
> { "ms5607", MS5607 },
> @@ -120,6 +127,7 @@ static struct spi_driver ms5611_driver = {
> },
> .id_table = ms5611_id,
> .probe = ms5611_spi_probe,
> + .remove = ms5611_spi_remove,
> };
> module_spi_driver(ms5611_driver);
>
>
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