/* * 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) { return st_sensors_set_enable(indio_dev, true); } static int st_press_buffer_postenable(struct iio_dev *indio_dev) { int err; struct st_sensor_data *press_data = iio_priv(indio_dev); press_data->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); if (press_data->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(press_data->buffer_data); allocate_memory_error: return err; } static int st_press_buffer_predisable(struct iio_dev *indio_dev) { int err; struct st_sensor_data *press_data = 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(press_data->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, NULL, &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");