1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * STMicroelectronics accelerometers 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_accel.h" 24 25 int st_accel_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_accel_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, indio_dev->active_scan_mask[0]); 41 if (err < 0) 42 goto st_accel_buffer_predisable; 43 44 err = st_sensors_set_enable(indio_dev, true); 45 if (err < 0) 46 goto st_accel_buffer_enable_all_axis; 47 48 return 0; 49 50 st_accel_buffer_enable_all_axis: 51 st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 52 st_accel_buffer_predisable: 53 iio_triggered_buffer_predisable(indio_dev); 54 return err; 55 } 56 57 static int st_accel_buffer_predisable(struct iio_dev *indio_dev) 58 { 59 int err, err2; 60 61 err = st_sensors_set_enable(indio_dev, false); 62 if (err < 0) 63 goto st_accel_buffer_predisable; 64 65 err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 66 67 st_accel_buffer_predisable: 68 err2 = iio_triggered_buffer_predisable(indio_dev); 69 if (!err) 70 err = err2; 71 72 return err; 73 } 74 75 static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = { 76 .postenable = &st_accel_buffer_postenable, 77 .predisable = &st_accel_buffer_predisable, 78 }; 79 80 int st_accel_allocate_ring(struct iio_dev *indio_dev) 81 { 82 return iio_triggered_buffer_setup(indio_dev, NULL, 83 &st_sensors_trigger_handler, &st_accel_buffer_setup_ops); 84 } 85 86 void st_accel_deallocate_ring(struct iio_dev *indio_dev) 87 { 88 iio_triggered_buffer_cleanup(indio_dev); 89 } 90 91 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 92 MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer"); 93 MODULE_LICENSE("GPL v2"); 94