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/slab.h> 13 #include <linux/stat.h> 14 #include <linux/interrupt.h> 15 #include <linux/i2c.h> 16 #include <linux/delay.h> 17 #include <linux/iio/iio.h> 18 #include <linux/iio/buffer.h> 19 #include <linux/iio/trigger_consumer.h> 20 #include <linux/iio/triggered_buffer.h> 21 22 #include <linux/iio/common/st_sensors.h> 23 #include "st_gyro.h" 24 25 int st_gyro_trig_set_state(struct iio_trigger *trig, bool state) 26 { 27 struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); 28 29 return st_sensors_set_dataready_irq(indio_dev, state); 30 } 31 32 static int st_gyro_buffer_postenable(struct iio_dev *indio_dev) 33 { 34 int err; 35 36 err = iio_triggered_buffer_postenable(indio_dev); 37 if (err < 0) 38 return err; 39 40 err = st_sensors_set_axis_enable(indio_dev, 41 (u8)indio_dev->active_scan_mask[0]); 42 if (err < 0) 43 goto st_gyro_buffer_predisable; 44 45 err = st_sensors_set_enable(indio_dev, true); 46 if (err < 0) 47 goto st_gyro_buffer_enable_all_axis; 48 49 return 0; 50 51 st_gyro_buffer_enable_all_axis: 52 st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 53 st_gyro_buffer_predisable: 54 iio_triggered_buffer_predisable(indio_dev); 55 return err; 56 } 57 58 static int st_gyro_buffer_predisable(struct iio_dev *indio_dev) 59 { 60 int err, err2; 61 62 err = st_sensors_set_enable(indio_dev, false); 63 if (err < 0) 64 goto st_gyro_buffer_predisable; 65 66 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 67 68 st_gyro_buffer_predisable: 69 err2 = iio_triggered_buffer_predisable(indio_dev); 70 if (!err) 71 err = err2; 72 73 return err; 74 } 75 76 static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = { 77 .postenable = &st_gyro_buffer_postenable, 78 .predisable = &st_gyro_buffer_predisable, 79 }; 80 81 int st_gyro_allocate_ring(struct iio_dev *indio_dev) 82 { 83 return iio_triggered_buffer_setup(indio_dev, NULL, 84 &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops); 85 } 86 87 void st_gyro_deallocate_ring(struct iio_dev *indio_dev) 88 { 89 iio_triggered_buffer_cleanup(indio_dev); 90 } 91 92 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 93 MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer"); 94 MODULE_LICENSE("GPL v2"); 95