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/module.h> 11 #include <linux/kernel.h> 12 #include <linux/iio/iio.h> 13 #include <linux/iio/buffer.h> 14 #include <linux/iio/trigger.h> 15 #include <linux/iio/triggered_buffer.h> 16 17 #include <linux/iio/common/st_sensors.h> 18 #include "st_gyro.h" 19 20 int st_gyro_trig_set_state(struct iio_trigger *trig, bool state) 21 { 22 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 23 24 return st_sensors_set_dataready_irq(indio_dev, state); 25 } 26 27 static int st_gyro_buffer_postenable(struct iio_dev *indio_dev) 28 { 29 int err; 30 31 err = st_sensors_set_axis_enable(indio_dev, indio_dev->active_scan_mask[0]); 32 if (err < 0) 33 return err; 34 35 err = st_sensors_set_enable(indio_dev, true); 36 if (err < 0) 37 goto st_gyro_buffer_enable_all_axis; 38 39 return 0; 40 41 st_gyro_buffer_enable_all_axis: 42 st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 43 return err; 44 } 45 46 static int st_gyro_buffer_predisable(struct iio_dev *indio_dev) 47 { 48 int err; 49 50 err = st_sensors_set_enable(indio_dev, false); 51 if (err < 0) 52 return err; 53 54 return st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 55 } 56 57 static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = { 58 .postenable = &st_gyro_buffer_postenable, 59 .predisable = &st_gyro_buffer_predisable, 60 }; 61 62 int st_gyro_allocate_ring(struct iio_dev *indio_dev) 63 { 64 return devm_iio_triggered_buffer_setup(indio_dev->dev.parent, indio_dev, 65 NULL, &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops); 66 } 67 68 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 69 MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer"); 70 MODULE_LICENSE("GPL v2"); 71