1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * STMicroelectronics gyroscopes driver 4 * 5 * Copyright 2012-2013 STMicroelectronics Inc. 6 * 7 * Denis Ciocca <denis.ciocca@st.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/iio/iio.h> 12 #include <linux/iio/buffer.h> 13 #include <linux/iio/trigger.h> 14 #include <linux/iio/triggered_buffer.h> 15 16 #include <linux/iio/common/st_sensors.h> 17 #include "st_gyro.h" 18 19 int st_gyro_trig_set_state(struct iio_trigger *trig, bool state) 20 { 21 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 22 23 return st_sensors_set_dataready_irq(indio_dev, state); 24 } 25 26 static int st_gyro_buffer_postenable(struct iio_dev *indio_dev) 27 { 28 int err; 29 30 err = st_sensors_set_axis_enable(indio_dev, indio_dev->active_scan_mask[0]); 31 if (err < 0) 32 return err; 33 34 err = st_sensors_set_enable(indio_dev, true); 35 if (err < 0) 36 goto st_gyro_buffer_enable_all_axis; 37 38 return 0; 39 40 st_gyro_buffer_enable_all_axis: 41 st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 42 return err; 43 } 44 45 static int st_gyro_buffer_predisable(struct iio_dev *indio_dev) 46 { 47 int err; 48 49 err = st_sensors_set_enable(indio_dev, false); 50 if (err < 0) 51 return err; 52 53 return st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 54 } 55 56 static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = { 57 .postenable = &st_gyro_buffer_postenable, 58 .predisable = &st_gyro_buffer_predisable, 59 }; 60 61 int st_gyro_allocate_ring(struct iio_dev *indio_dev) 62 { 63 return devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev, 64 NULL, &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops); 65 } 66 67