| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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, |
| 41 | (u8)indio_dev->active_scan_mask[0]); |
| 42 | if (err < 0) |
| 43 | goto st_accel_buffer_predisable; |
| 44 | |
| 45 | err = st_sensors_set_enable(indio_dev, true); |
| 46 | if (err < 0) |
| 47 | goto st_accel_buffer_enable_all_axis; |
| 48 | |
| 49 | return 0; |
| 50 | |
| 51 | st_accel_buffer_enable_all_axis: |
| 52 | st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); |
| 53 | st_accel_buffer_predisable: |
| 54 | iio_triggered_buffer_predisable(indio_dev); |
| 55 | return err; |
| 56 | } |
| 57 | |
| 58 | static int st_accel_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_accel_buffer_predisable; |
| 65 | |
| 66 | err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); |
| 67 | |
| 68 | st_accel_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_accel_buffer_setup_ops = { |
| 77 | .postenable = &st_accel_buffer_postenable, |
| 78 | .predisable = &st_accel_buffer_predisable, |
| 79 | }; |
| 80 | |
| 81 | int st_accel_allocate_ring(struct iio_dev *indio_dev) |
| 82 | { |
| 83 | return iio_triggered_buffer_setup(indio_dev, NULL, |
| 84 | &st_sensors_trigger_handler, &st_accel_buffer_setup_ops); |
| 85 | } |
| 86 | |
| 87 | void st_accel_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 accelerometers buffer"); |
| 94 | MODULE_LICENSE("GPL v2"); |