2 * STMicroelectronics sensors buffer library driver
4 * Copyright 2012-2013 STMicroelectronics Inc.
6 * Denis Ciocca <denis.ciocca@st.com>
8 * Licensed under the GPL-2.
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>
22 #include <linux/iio/common/st_sensors.h>
25 int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
29 struct st_sensor_data *sdata = iio_priv(indio_dev);
30 unsigned int num_data_channels = sdata->num_data_channels;
31 unsigned int byte_for_channel =
32 indio_dev->channels[0].scan_type.storagebits >> 3;
34 addr = kmalloc(num_data_channels, GFP_KERNEL);
37 goto st_sensors_get_buffer_element_error;
40 for (i = 0; i < num_data_channels; i++) {
41 if (test_bit(i, indio_dev->active_scan_mask)) {
42 addr[n] = indio_dev->channels[i].address;
48 len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
49 addr[0], byte_for_channel, buf, sdata->multiread_bit);
52 if ((addr[1] - addr[0]) == byte_for_channel) {
53 len = sdata->tf->read_multiple_byte(&sdata->tb,
54 sdata->dev, addr[0], byte_for_channel * n,
55 buf, sdata->multiread_bit);
58 rx_array = kmalloc(byte_for_channel * num_data_channels,
62 goto st_sensors_free_memory;
65 len = sdata->tf->read_multiple_byte(&sdata->tb,
67 byte_for_channel * num_data_channels,
68 rx_array, sdata->multiread_bit);
71 goto st_sensors_free_memory;
74 for (i = 0; i < n * byte_for_channel; i++) {
78 buf[i] = rx_array[n + i];
81 len = byte_for_channel * n;
85 len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
86 addr[0], byte_for_channel * num_data_channels,
87 buf, sdata->multiread_bit);
91 goto st_sensors_free_memory;
93 if (len != byte_for_channel * n) {
95 goto st_sensors_free_memory;
98 st_sensors_free_memory:
100 st_sensors_get_buffer_element_error:
103 EXPORT_SYMBOL(st_sensors_get_buffer_element);
105 irqreturn_t st_sensors_trigger_handler(int irq, void *p)
108 struct iio_poll_func *pf = p;
109 struct iio_dev *indio_dev = pf->indio_dev;
110 struct st_sensor_data *sdata = iio_priv(indio_dev);
112 len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data);
114 goto st_sensors_get_buffer_element_error;
116 iio_push_to_buffers_with_timestamp(indio_dev, sdata->buffer_data,
119 st_sensors_get_buffer_element_error:
120 iio_trigger_notify_done(indio_dev->trig);
124 EXPORT_SYMBOL(st_sensors_trigger_handler);
126 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
127 MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer");
128 MODULE_LICENSE("GPL v2");