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 = st_sensors_set_axis_enable(indio_dev, indio_dev->active_scan_mask[0]); 37 if (err < 0) 38 return err; 39 40 err = st_sensors_set_enable(indio_dev, true); 41 if (err < 0) 42 goto st_accel_buffer_enable_all_axis; 43 44 return 0; 45 46 st_accel_buffer_enable_all_axis: 47 st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); 48 return err; 49 } 50 51 static int st_accel_buffer_predisable(struct iio_dev *indio_dev) 52 { 53 int err; 54 55 err = st_sensors_set_enable(indio_dev, false); 56 if (err < 0) 57 return err; 58 59 return st_sensors_set_axis_enable(indio_dev, 60 ST_SENSORS_ENABLE_ALL_AXIS); 61 } 62 63 static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = { 64 .postenable = &st_accel_buffer_postenable, 65 .predisable = &st_accel_buffer_predisable, 66 }; 67 68 int st_accel_allocate_ring(struct iio_dev *indio_dev) 69 { 70 return iio_triggered_buffer_setup(indio_dev, NULL, 71 &st_sensors_trigger_handler, &st_accel_buffer_setup_ops); 72 } 73 74 void st_accel_deallocate_ring(struct iio_dev *indio_dev) 75 { 76 iio_triggered_buffer_cleanup(indio_dev); 77 } 78 79 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 80 MODULE_DESCRIPTION("STMicroelectronics accelerometers buffer"); 81 MODULE_LICENSE("GPL v2"); 82