| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * STMicroelectronics magnetometers driver |
| 3 | * |
| 4 | * Copyright 2012-2013 STMicroelectronics Inc. |
| 5 | * |
| 6 | * Denis Ciocca <denis.ciocca@st.com> |
| 7 | * |
| 8 | * Licensed under the GPL-2. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/stat.h> |
| 15 | #include <linux/interrupt.h> |
| 16 | #include <linux/i2c.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/iio/iio.h> |
| 19 | #include <linux/iio/buffer.h> |
| 20 | #include <linux/iio/trigger_consumer.h> |
| 21 | #include <linux/iio/triggered_buffer.h> |
| 22 | |
| 23 | #include <linux/iio/common/st_sensors.h> |
| 24 | #include "st_magn.h" |
| 25 | |
| 26 | int st_magn_trig_set_state(struct iio_trigger *trig, bool state) |
| 27 | { |
| 28 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| 29 | |
| 30 | return st_sensors_set_dataready_irq(indio_dev, state); |
| 31 | } |
| 32 | |
| 33 | static int st_magn_buffer_preenable(struct iio_dev *indio_dev) |
| 34 | { |
| 35 | return st_sensors_set_enable(indio_dev, true); |
| 36 | } |
| 37 | |
| 38 | static int st_magn_buffer_postenable(struct iio_dev *indio_dev) |
| 39 | { |
| 40 | int err; |
| 41 | struct st_sensor_data *mdata = iio_priv(indio_dev); |
| 42 | |
| 43 | mdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); |
| 44 | if (mdata->buffer_data == NULL) { |
| 45 | err = -ENOMEM; |
| 46 | goto allocate_memory_error; |
| 47 | } |
| 48 | |
| 49 | err = iio_triggered_buffer_postenable(indio_dev); |
| 50 | if (err < 0) |
| 51 | goto st_magn_buffer_postenable_error; |
| 52 | |
| 53 | return err; |
| 54 | |
| 55 | st_magn_buffer_postenable_error: |
| 56 | kfree(mdata->buffer_data); |
| 57 | allocate_memory_error: |
| 58 | return err; |
| 59 | } |
| 60 | |
| 61 | static int st_magn_buffer_predisable(struct iio_dev *indio_dev) |
| 62 | { |
| 63 | int err; |
| 64 | struct st_sensor_data *mdata = iio_priv(indio_dev); |
| 65 | |
| 66 | err = iio_triggered_buffer_predisable(indio_dev); |
| 67 | if (err < 0) |
| 68 | goto st_magn_buffer_predisable_error; |
| 69 | |
| 70 | err = st_sensors_set_enable(indio_dev, false); |
| 71 | |
| 72 | st_magn_buffer_predisable_error: |
| 73 | kfree(mdata->buffer_data); |
| 74 | return err; |
| 75 | } |
| 76 | |
| 77 | static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = { |
| 78 | .preenable = &st_magn_buffer_preenable, |
| 79 | .postenable = &st_magn_buffer_postenable, |
| 80 | .predisable = &st_magn_buffer_predisable, |
| 81 | }; |
| 82 | |
| 83 | int st_magn_allocate_ring(struct iio_dev *indio_dev) |
| 84 | { |
| 85 | return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, |
| 86 | &st_sensors_trigger_handler, &st_magn_buffer_setup_ops); |
| 87 | } |
| 88 | |
| 89 | void st_magn_deallocate_ring(struct iio_dev *indio_dev) |
| 90 | { |
| 91 | iio_triggered_buffer_cleanup(indio_dev); |
| 92 | } |
| 93 | |
| 94 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); |
| 95 | MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer"); |
| 96 | MODULE_LICENSE("GPL v2"); |