projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7be56a8f DC |
1 | /* |
| 2 | * STMicroelectronics gyroscopes 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_gyro.h" | |
| 25 | ||
| 26 | int st_gyro_trig_set_state(struct iio_trigger *trig, bool state) | |
| 27 | { | |
| 1e9663c6 | 28 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); |
| 7be56a8f DC |
29 | |
| 30 | return st_sensors_set_dataready_irq(indio_dev, state); | |
| 31 | } | |
| 32 | ||
| 33 | static int st_gyro_buffer_preenable(struct iio_dev *indio_dev) | |
| 34 | { | |
| d4b2911b | 35 | return st_sensors_set_enable(indio_dev, true); |
| 7be56a8f DC |
36 | } |
| 37 | ||
| 38 | static int st_gyro_buffer_postenable(struct iio_dev *indio_dev) | |
| 39 | { | |
| 40 | int err; | |
| 41 | struct st_sensor_data *gdata = iio_priv(indio_dev); | |
| 42 | ||
| 43 | gdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL); | |
| 44 | if (gdata->buffer_data == NULL) { | |
| 45 | err = -ENOMEM; | |
| 46 | goto allocate_memory_error; | |
| 47 | } | |
| 48 | ||
| 49 | err = st_sensors_set_axis_enable(indio_dev, | |
| 50 | (u8)indio_dev->active_scan_mask[0]); | |
| 51 | if (err < 0) | |
| 52 | goto st_gyro_buffer_postenable_error; | |
| 53 | ||
| 54 | err = iio_triggered_buffer_postenable(indio_dev); | |
| 55 | if (err < 0) | |
| 56 | goto st_gyro_buffer_postenable_error; | |
| 57 | ||
| 58 | return err; | |
| 59 | ||
| 60 | st_gyro_buffer_postenable_error: | |
| 61 | kfree(gdata->buffer_data); | |
| 62 | allocate_memory_error: | |
| 63 | return err; | |
| 64 | } | |
| 65 | ||
| 66 | static int st_gyro_buffer_predisable(struct iio_dev *indio_dev) | |
| 67 | { | |
| 68 | int err; | |
| 69 | struct st_sensor_data *gdata = iio_priv(indio_dev); | |
| 70 | ||
| 71 | err = iio_triggered_buffer_predisable(indio_dev); | |
| 72 | if (err < 0) | |
| 73 | goto st_gyro_buffer_predisable_error; | |
| 74 | ||
| 75 | err = st_sensors_set_axis_enable(indio_dev, ST_SENSORS_ENABLE_ALL_AXIS); | |
| 76 | if (err < 0) | |
| 77 | goto st_gyro_buffer_predisable_error; | |
| 78 | ||
| 79 | err = st_sensors_set_enable(indio_dev, false); | |
| 80 | ||
| 81 | st_gyro_buffer_predisable_error: | |
| 82 | kfree(gdata->buffer_data); | |
| 83 | return err; | |
| 84 | } | |
| 85 | ||
| 86 | static const struct iio_buffer_setup_ops st_gyro_buffer_setup_ops = { | |
| 87 | .preenable = &st_gyro_buffer_preenable, | |
| 88 | .postenable = &st_gyro_buffer_postenable, | |
| 89 | .predisable = &st_gyro_buffer_predisable, | |
| 90 | }; | |
| 91 | ||
| 92 | int st_gyro_allocate_ring(struct iio_dev *indio_dev) | |
| 93 | { | |
| 65925b65 | 94 | return iio_triggered_buffer_setup(indio_dev, NULL, |
| 7be56a8f DC |
95 | &st_sensors_trigger_handler, &st_gyro_buffer_setup_ops); |
| 96 | } | |
| 97 | ||
| 98 | void st_gyro_deallocate_ring(struct iio_dev *indio_dev) | |
| 99 | { | |
| 100 | iio_triggered_buffer_cleanup(indio_dev); | |
| 101 | } | |
| 102 | ||
| 103 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); | |
| 104 | MODULE_DESCRIPTION("STMicroelectronics gyroscopes buffer"); | |
| 105 | MODULE_LICENSE("GPL v2"); |