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/*
* STMicroelectronics sensors buffer library driver
*
* Copyright 2012-2013 STMicroelectronics Inc.
*
* Denis Ciocca <denis.ciocca@st.com>
*
* Licensed under the GPL-2.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>
#include <linux/interrupt.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/irqreturn.h>
#include <linux/iio/common/st_sensors.h>
int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
{
int i, n = 0, len;
u8 addr[ST_SENSORS_NUMBER_DATA_CHANNELS];
struct st_sensor_data *sdata = iio_priv(indio_dev);
for (i = 0; i < ST_SENSORS_NUMBER_DATA_CHANNELS; i++) {
if (test_bit(i, indio_dev->active_scan_mask)) {
addr[n] = indio_dev->channels[i].address;
n++;
}
}
switch (n) {
case 1:
len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
addr[0], ST_SENSORS_BYTE_FOR_CHANNEL, buf,
sdata->multiread_bit);
break;
case 2:
if ((addr[1] - addr[0]) == ST_SENSORS_BYTE_FOR_CHANNEL) {
len = sdata->tf->read_multiple_byte(&sdata->tb,
sdata->dev, addr[0],
ST_SENSORS_BYTE_FOR_CHANNEL*n,
buf, sdata->multiread_bit);
} else {
u8 rx_array[ST_SENSORS_BYTE_FOR_CHANNEL*
ST_SENSORS_NUMBER_DATA_CHANNELS];
len = sdata->tf->read_multiple_byte(&sdata->tb,
sdata->dev, addr[0],
ST_SENSORS_BYTE_FOR_CHANNEL*
ST_SENSORS_NUMBER_DATA_CHANNELS,
rx_array, sdata->multiread_bit);
if (len < 0)
goto read_data_channels_error;
for (i = 0; i < n * ST_SENSORS_NUMBER_DATA_CHANNELS;
i++) {
if (i < n)
buf[i] = rx_array[i];
else
buf[i] = rx_array[n + i];
}
len = ST_SENSORS_BYTE_FOR_CHANNEL*n;
}
break;
case 3:
len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
addr[0], ST_SENSORS_BYTE_FOR_CHANNEL*
ST_SENSORS_NUMBER_DATA_CHANNELS,
buf, sdata->multiread_bit);
break;
default:
len = -EINVAL;
goto read_data_channels_error;
}
if (len != ST_SENSORS_BYTE_FOR_CHANNEL*n) {
len = -EIO;
goto read_data_channels_error;
}
read_data_channels_error:
return len;
}
EXPORT_SYMBOL(st_sensors_get_buffer_element);
irqreturn_t st_sensors_trigger_handler(int irq, void *p)
{
int len;
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct st_sensor_data *sdata = iio_priv(indio_dev);
len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data);
if (len < 0)
goto st_sensors_get_buffer_element_error;
if (indio_dev->scan_timestamp)
*(s64 *)((u8 *)sdata->buffer_data +
ALIGN(len, sizeof(s64))) = pf->timestamp;
iio_push_to_buffers(indio_dev, sdata->buffer_data);
st_sensors_get_buffer_element_error:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
EXPORT_SYMBOL(st_sensors_trigger_handler);
MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer");
MODULE_LICENSE("GPL v2");
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