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author | Denis CIOCCA <denis.ciocca@st.com> | 2013-06-03 15:58:00 +0100 |
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committer | Jonathan Cameron <jic23@kernel.org> | 2013-06-05 18:41:23 +0100 |
commit | 217494e5b780ad85485c1bb6382ce50b5fa2dc26 (patch) | |
tree | 26e9fd1c62477c099c05a3fbcdd265c287bc1ef8 /drivers/iio/pressure/st_pressure_buffer.c | |
parent | 607a568ab69c5ac345a286267a27294888f8bb5f (diff) | |
download | op-kernel-dev-217494e5b780ad85485c1bb6382ce50b5fa2dc26.zip op-kernel-dev-217494e5b780ad85485c1bb6382ce50b5fa2dc26.tar.gz |
iio:pressure: Add STMicroelectronics pressures driver
This patch adds a generic pressure driver for STMicroelectronics
pressure sensors, currently it supports: LPS331AP.
Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/pressure/st_pressure_buffer.c')
-rw-r--r-- | drivers/iio/pressure/st_pressure_buffer.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/iio/pressure/st_pressure_buffer.c b/drivers/iio/pressure/st_pressure_buffer.c new file mode 100644 index 0000000..f877ef8 --- /dev/null +++ b/drivers/iio/pressure/st_pressure_buffer.c @@ -0,0 +1,105 @@ +/* + * STMicroelectronics pressures driver + * + * Copyright 2013 STMicroelectronics Inc. + * + * Denis Ciocca <denis.ciocca@st.com> + * + * Licensed under the GPL-2. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/stat.h> +#include <linux/interrupt.h> +#include <linux/i2c.h> +#include <linux/delay.h> +#include <linux/iio/iio.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> + +#include <linux/iio/common/st_sensors.h> +#include "st_pressure.h" + +int st_press_trig_set_state(struct iio_trigger *trig, bool state) +{ + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); + + return st_sensors_set_dataready_irq(indio_dev, state); +} + +static int st_press_buffer_preenable(struct iio_dev *indio_dev) +{ + int err; + + err = st_sensors_set_enable(indio_dev, true); + if (err < 0) + goto st_press_set_enable_error; + + err = iio_sw_buffer_preenable(indio_dev); + +st_press_set_enable_error: + return err; +} + +static int st_press_buffer_postenable(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *pdata = iio_priv(indio_dev); + + pdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); + if (pdata->buffer_data == NULL) { + err = -ENOMEM; + goto allocate_memory_error; + } + + err = iio_triggered_buffer_postenable(indio_dev); + if (err < 0) + goto st_press_buffer_postenable_error; + + return err; + +st_press_buffer_postenable_error: + kfree(pdata->buffer_data); +allocate_memory_error: + return err; +} + +static int st_press_buffer_predisable(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *pdata = iio_priv(indio_dev); + + err = iio_triggered_buffer_predisable(indio_dev); + if (err < 0) + goto st_press_buffer_predisable_error; + + err = st_sensors_set_enable(indio_dev, false); + +st_press_buffer_predisable_error: + kfree(pdata->buffer_data); + return err; +} + +static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = { + .preenable = &st_press_buffer_preenable, + .postenable = &st_press_buffer_postenable, + .predisable = &st_press_buffer_predisable, +}; + +int st_press_allocate_ring(struct iio_dev *indio_dev) +{ + return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, + &st_sensors_trigger_handler, &st_press_buffer_setup_ops); +} + +void st_press_deallocate_ring(struct iio_dev *indio_dev) +{ + iio_triggered_buffer_cleanup(indio_dev); +} + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics pressures buffer"); +MODULE_LICENSE("GPL v2"); |