projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 23491b51 DC |
1 | /* |
| 2 | * STMicroelectronics sensors buffer library 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/kernel.h> | |
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/slab.h> | |
| 14 | #include <linux/iio/iio.h> | |
| 15 | #include <linux/iio/trigger.h> | |
| 16 | #include <linux/interrupt.h> | |
| 17 | #include <linux/iio/buffer.h> | |
| 18 | #include <linux/iio/trigger_consumer.h> | |
| 19 | #include <linux/iio/triggered_buffer.h> | |
| 20 | #include <linux/irqreturn.h> | |
| 21 | ||
| 22 | #include <linux/iio/common/st_sensors.h> | |
| 23 | ||
| 24 | ||
| 25 | int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf) | |
| 26 | { | |
| 6436db37 LW |
27 | int i, len; |
| 28 | int total = 0; | |
| 23491b51 | 29 | struct st_sensor_data *sdata = iio_priv(indio_dev); |
| 607a568a | 30 | unsigned int num_data_channels = sdata->num_data_channels; |
| 23491b51 | 31 | |
| 607a568a | 32 | for (i = 0; i < num_data_channels; i++) { |
| 6436db37 LW |
33 | unsigned int bytes_to_read; |
| 34 | ||
| 23491b51 | 35 | if (test_bit(i, indio_dev->active_scan_mask)) { |
| 6436db37 | 36 | bytes_to_read = indio_dev->channels[i].scan_type.storagebits >> 3; |
| 23491b51 | 37 | len = sdata->tf->read_multiple_byte(&sdata->tb, |
| 6436db37 LW |
38 | sdata->dev, indio_dev->channels[i].address, |
| 39 | bytes_to_read, | |
| 40 | buf + total, sdata->multiread_bit); | |
| 607a568a | 41 | |
| 6436db37 LW |
42 | if (len < bytes_to_read) |
| 43 | return -EIO; | |
| 23491b51 | 44 | |
| 6436db37 LW |
45 | /* Advance the buffer pointer */ |
| 46 | total += len; | |
| 23491b51 | 47 | } |
| 23491b51 DC |
48 | } |
| 49 | ||
| 6436db37 | 50 | return total; |
| 23491b51 DC |
51 | } |
| 52 | EXPORT_SYMBOL(st_sensors_get_buffer_element); | |
| 53 | ||
| 54 | irqreturn_t st_sensors_trigger_handler(int irq, void *p) | |
| 55 | { | |
| 56 | int len; | |
| 57 | struct iio_poll_func *pf = p; | |
| 58 | struct iio_dev *indio_dev = pf->indio_dev; | |
| 59 | struct st_sensor_data *sdata = iio_priv(indio_dev); | |
| 65925b65 | 60 | s64 timestamp; |
| 23491b51 | 61 | |
| 65925b65 LW |
62 | /* If we do timetamping here, do it before reading the values */ |
| 63 | if (sdata->hw_irq_trigger) | |
| 64 | timestamp = sdata->hw_timestamp; | |
| 65 | else | |
| 66 | timestamp = iio_get_time_ns(); | |
| 97865fe4 | 67 | |
| 23491b51 DC |
68 | len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data); |
| 69 | if (len < 0) | |
| 70 | goto st_sensors_get_buffer_element_error; | |
| 71 | ||
| aa4e2427 | 72 | iio_push_to_buffers_with_timestamp(indio_dev, sdata->buffer_data, |
| 65925b65 | 73 | timestamp); |
| 23491b51 DC |
74 | |
| 75 | st_sensors_get_buffer_element_error: | |
| 76 | iio_trigger_notify_done(indio_dev->trig); | |
| 77 | ||
| 78 | return IRQ_HANDLED; | |
| 79 | } | |
| 80 | EXPORT_SYMBOL(st_sensors_trigger_handler); | |
| 81 | ||
| 82 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); | |
| 83 | MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer"); | |
| 84 | MODULE_LICENSE("GPL v2"); |