projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 872e79ad DC |
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 | static int st_magn_buffer_preenable(struct iio_dev *indio_dev) | |
| 27 | { | |
| bbc1751d | 28 | return st_sensors_set_enable(indio_dev, true); |
| 872e79ad DC |
29 | } |
| 30 | ||
| 31 | static int st_magn_buffer_postenable(struct iio_dev *indio_dev) | |
| 32 | { | |
| 33 | int err; | |
| 34 | struct st_sensor_data *mdata = iio_priv(indio_dev); | |
| 35 | ||
| 36 | mdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); | |
| 37 | if (mdata->buffer_data == NULL) { | |
| 38 | err = -ENOMEM; | |
| 39 | goto allocate_memory_error; | |
| 40 | } | |
| 41 | ||
| 42 | err = iio_triggered_buffer_postenable(indio_dev); | |
| 43 | if (err < 0) | |
| 44 | goto st_magn_buffer_postenable_error; | |
| 45 | ||
| 46 | return err; | |
| 47 | ||
| 48 | st_magn_buffer_postenable_error: | |
| 49 | kfree(mdata->buffer_data); | |
| 50 | allocate_memory_error: | |
| 51 | return err; | |
| 52 | } | |
| 53 | ||
| 54 | static int st_magn_buffer_predisable(struct iio_dev *indio_dev) | |
| 55 | { | |
| 56 | int err; | |
| 57 | struct st_sensor_data *mdata = iio_priv(indio_dev); | |
| 58 | ||
| 59 | err = iio_triggered_buffer_predisable(indio_dev); | |
| 60 | if (err < 0) | |
| 61 | goto st_magn_buffer_predisable_error; | |
| 62 | ||
| 63 | err = st_sensors_set_enable(indio_dev, false); | |
| 64 | ||
| 65 | st_magn_buffer_predisable_error: | |
| 66 | kfree(mdata->buffer_data); | |
| 67 | return err; | |
| 68 | } | |
| 69 | ||
| 70 | static const struct iio_buffer_setup_ops st_magn_buffer_setup_ops = { | |
| 71 | .preenable = &st_magn_buffer_preenable, | |
| 72 | .postenable = &st_magn_buffer_postenable, | |
| 73 | .predisable = &st_magn_buffer_predisable, | |
| 74 | }; | |
| 75 | ||
| 76 | int st_magn_allocate_ring(struct iio_dev *indio_dev) | |
| 77 | { | |
| 78 | return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, | |
| 79 | &st_sensors_trigger_handler, &st_magn_buffer_setup_ops); | |
| 80 | } | |
| 81 | ||
| 82 | void st_magn_deallocate_ring(struct iio_dev *indio_dev) | |
| 83 | { | |
| 84 | iio_triggered_buffer_cleanup(indio_dev); | |
| 85 | } | |
| 86 | ||
| 87 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); | |
| 88 | MODULE_DESCRIPTION("STMicroelectronics magnetometers buffer"); | |
| 89 | MODULE_LICENSE("GPL v2"); |