1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * STMicroelectronics magnetometers 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_magn.h" 24 25 int st_magn_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_magn_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_enable(indio_dev, true); 41 if (err < 0) 42 goto st_magn_buffer_predisable; 43 44 return 0; 45 46 st_magn_buffer_predisable: 47 iio_triggered_buffer_predisable(indio_dev); 48 return err; 49 } 50 51 static int st_magn_buffer_predisable(struct iio_dev *indio_dev) 52 { 53 int err, err2; 54 55 err = st_sensors_set_enable(indio_dev, false); 56 57 err2 = iio_triggered_buffer_predisable(indio_dev); 58 if (!err) 59 err = err2; 60 61 return err; 62 } 63 64 static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = { 65 .postenable = &st_magn_buffer_postenable, 66 .predisable = &st_magn_buffer_predisable, 67 }; 68 69 int st_magn_allocate_ring(struct iio_dev *indio_dev) 70 { 71 return iio_triggered_buffer_setup(indio_dev, NULL, 72 &st_sensors_trigger_handler, &st_magn_buffer_setup_ops); 73 } 74 75 void st_magn_deallocate_ring(struct iio_dev *indio_dev) 76 { 77 iio_triggered_buffer_cleanup(indio_dev); 78 } 79 80 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 81 MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer"); 82 MODULE_LICENSE("GPL v2"); 83