diff options
author | Denis Ciocca <denis.ciocca@gmail.com> | 2013-01-26 03:44:00 +0400 |
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committer | Jonathan Cameron <jic23@kernel.org> | 2013-01-31 21:56:43 +0400 |
commit | d62511689de5d34d3a07c43db1f46a234bb77b5f (patch) | |
tree | 945bdd5e1ab436db7ed3c1d58966cb7291320662 /drivers/iio/accel/st_accel_buffer.c | |
parent | 23491b513bcd3dfe4ddb94547d73d9deb94eda44 (diff) | |
download | linux-d62511689de5d34d3a07c43db1f46a234bb77b5f.tar.xz |
iio:accel: Add STMicroelectronics accelerometers driver
This patch adds a generic accelerometer driver for STMicroelectronics
accelerometers, currently it supports:
LSM303DLH, LSM303DLHC, LIS3DH, LSM330D, LSM330DL, LSM330DLC,
LIS331DLH, LSM303DL, LSM303DLM, LSM330.
Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/accel/st_accel_buffer.c')
-rw-r--r-- | drivers/iio/accel/st_accel_buffer.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/drivers/iio/accel/st_accel_buffer.c b/drivers/iio/accel/st_accel_buffer.c new file mode 100644 index 000000000000..6bd82c7f769c --- /dev/null +++ b/drivers/iio/accel/st_accel_buffer.c @@ -0,0 +1,114 @@ +/* + * STMicroelectronics accelerometers driver + * + * Copyright 2012-2013 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_accel.h" + +int st_accel_trig_set_state(struct iio_trigger *trig, bool state) +{ + struct iio_dev *indio_dev = trig->private_data; + + return st_sensors_set_dataready_irq(indio_dev, state); +} + +static int st_accel_buffer_preenable(struct iio_dev *indio_dev) +{ + int err; + + err = st_sensors_set_enable(indio_dev, true); + if (err < 0) + goto st_accel_set_enable_error; + + err = iio_sw_buffer_preenable(indio_dev); + +st_accel_set_enable_error: + return err; +} + +static int st_accel_buffer_postenable(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *adata = iio_priv(indio_dev); + + adata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); + if (adata->buffer_data == NULL) { + err = -ENOMEM; + goto allocate_memory_error; + } + + err = st_sensors_set_axis_enable(indio_dev, + (u8)indio_dev->active_scan_mask[0]); + if (err < 0) + goto st_accel_buffer_postenable_error; + + err = iio_triggered_buffer_postenable(indio_dev); + if (err < 0) + goto st_accel_buffer_postenable_error; + + return err; + +st_accel_buffer_postenable_error: + kfree(adata->buffer_data); +allocate_memory_error: + return err; +} + +static int st_accel_buffer_predisable(struct iio_dev *indio_dev) +{ + int err; + struct st_sensor_data *adata = iio_priv(indio_dev); + + err = iio_triggered_buffer_predisable(indio_dev); + if (err < 0) + goto st_accel_buffer_predisable_error; + + err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); + if (err < 0) + goto st_accel_buffer_predisable_error; + + err = st_sensors_set_enable(indio_dev, false); + +st_accel_buffer_predisable_error: + kfree(adata->buffer_data); + return err; +} + +static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = { + .preenable = &st_accel_buffer_preenable, + .postenable = &st_accel_buffer_postenable, + .predisable = &st_accel_buffer_predisable, +}; + +int st_accel_allocate_ring(struct iio_dev *indio_dev) +{ + return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, + &st_sensors_trigger_handler, &st_accel_buffer_setup_ops); +} + +void st_accel_deallocate_ring(struct iio_dev *indio_dev) +{ + iio_triggered_buffer_cleanup(indio_dev); +} + +MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer"); +MODULE_LICENSE("GPL v2"); |