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staging: iio: generic_buffer cleanup 

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Meerwald 2012-06-25 23:12:14 +02:00 committed by Greg Kroah-Hartman
parent b42f2a0c65
commit d8da0eeed7
1 changed files with 30 additions and 30 deletions
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60
drivers/staging/iio/Documentation/generic_buffer.c
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@ -33,8 +33,8 @@
/** /**
* size_from_channelarray() - calculate the storage size of a scan * size_from_channelarray() - calculate the storage size of a scan
* @channels: the channel info array * @channels: the channel info array
* @num_channels: size of the channel info array * @num_channels: number of channels
* *
* Has the side effect of filling the channels[i].location values used * Has the side effect of filling the channels[i].location values used
* in processing the buffer output. * in processing the buffer output.
@ -58,14 +58,15 @@ int size_from_channelarray(struct iio_channel_info *channels, int num_channels)
void print2byte(int input, struct iio_channel_info *info) void print2byte(int input, struct iio_channel_info *info)
{ {
/* First swap if incorrect endian */ /* First swap if incorrect endian */
if (info->be) if (info->be)
input = be16toh((uint16_t)input); input = be16toh((uint16_t)input);
else else
input = le16toh((uint16_t)input); input = le16toh((uint16_t)input);
/* shift before conversion to avoid sign extension /*
of left aligned data */ * Shift before conversion to avoid sign extension
* of left aligned data
*/
input = input >> info->shift; input = input >> info->shift;
if (info->is_signed) { if (info->is_signed) {
int16_t val = input; int16_t val = input;
@ -82,39 +83,39 @@ void print2byte(int input, struct iio_channel_info *info)
/** /**
* process_scan() - print out the values in SI units * process_scan() - print out the values in SI units
* @data: pointer to the start of the scan * @data: pointer to the start of the scan
* @infoarray: information about the channels. Note * @channels: information about the channels. Note
* size_from_channelarray must have been called first to fill the * size_from_channelarray must have been called first to fill the
* location offsets. * location offsets.
* @num_channels: the number of active channels * @num_channels: number of channels
**/ **/
void process_scan(char *data, void process_scan(char *data,
struct iio_channel_info *infoarray, struct iio_channel_info *channels,
int num_channels) int num_channels)
{ {
int k; int k;
for (k = 0; k < num_channels; k++) for (k = 0; k < num_channels; k++)
switch (infoarray[k].bytes) { switch (channels[k].bytes) {
/* only a few cases implemented so far */ /* only a few cases implemented so far */
case 2: case 2:
print2byte(*(uint16_t *)(data + infoarray[k].location), print2byte(*(uint16_t *)(data + channels[k].location),
&infoarray[k]); &channels[k]);
break; break;
case 8: case 8:
if (infoarray[k].is_signed) { if (channels[k].is_signed) {
int64_t val = *(int64_t *) int64_t val = *(int64_t *)
(data + (data +
infoarray[k].location); channels[k].location);
if ((val >> infoarray[k].bits_used) & 1) if ((val >> channels[k].bits_used) & 1)
val = (val & infoarray[k].mask) | val = (val & channels[k].mask) |
~infoarray[k].mask; ~channels[k].mask;
/* special case for timestamp */ /* special case for timestamp */
if (infoarray[k].scale == 1.0f && if (channels[k].scale == 1.0f &&
infoarray[k].offset == 0.0f) channels[k].offset == 0.0f)
printf(" %lld", val); printf(" %lld", val);
else else
printf("%05f ", ((float)val + printf("%05f ", ((float)val +
infoarray[k].offset)* channels[k].offset)*
infoarray[k].scale); channels[k].scale);
} }
break; break;
default: default:
@ -129,7 +130,6 @@ int main(int argc, char **argv)
unsigned long timedelay = 1000000; unsigned long timedelay = 1000000;
unsigned long buf_len = 128; unsigned long buf_len = 128;
int ret, c, i, j, toread; int ret, c, i, j, toread;
int fp; int fp;
@ -146,7 +146,7 @@ int main(int argc, char **argv)
int noevents = 0; int noevents = 0;
char *dummy; char *dummy;
struct iio_channel_info *infoarray; struct iio_channel_info *channels;
while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) { while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) {
switch (c) { switch (c) {
@ -189,7 +189,7 @@ int main(int argc, char **argv)
asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num); asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
if (trigger_name == NULL) { if (trigger_name == NULL) {
/* /*
* Build the trigger name. If it is device associated it's * Build the trigger name. If it is device associated its
* name is <device_name>_dev[n] where n matches the device * name is <device_name>_dev[n] where n matches the device
* number found above * number found above
*/ */
@ -214,7 +214,7 @@ int main(int argc, char **argv)
* Parse the files in scan_elements to identify what channels are * Parse the files in scan_elements to identify what channels are
* present * present
*/ */
ret = build_channel_array(dev_dir_name, &infoarray, &num_channels); ret = build_channel_array(dev_dir_name, &channels, &num_channels);
if (ret) { if (ret) {
printf("Problem reading scan element information\n"); printf("Problem reading scan element information\n");
printf("diag %s\n", dev_dir_name); printf("diag %s\n", dev_dir_name);
@ -233,7 +233,7 @@ int main(int argc, char **argv)
goto error_free_triggername; goto error_free_triggername;
} }
printf("%s %s\n", dev_dir_name, trigger_name); printf("%s %s\n", dev_dir_name, trigger_name);
/* Set the device trigger to be the data rdy trigger found above */ /* Set the device trigger to be the data ready trigger found above */
ret = write_sysfs_string_and_verify("trigger/current_trigger", ret = write_sysfs_string_and_verify("trigger/current_trigger",
dev_dir_name, dev_dir_name,
trigger_name); trigger_name);
@ -251,7 +251,7 @@ int main(int argc, char **argv)
ret = write_sysfs_int("enable", buf_dir_name, 1); ret = write_sysfs_int("enable", buf_dir_name, 1);
if (ret < 0) if (ret < 0)
goto error_free_buf_dir_name; goto error_free_buf_dir_name;
scan_size = size_from_channelarray(infoarray, num_channels); scan_size = size_from_channelarray(channels, num_channels);
data = malloc(scan_size*buf_len); data = malloc(scan_size*buf_len);
if (!data) { if (!data) {
ret = -ENOMEM; ret = -ENOMEM;
@ -266,7 +266,7 @@ int main(int argc, char **argv)
/* Attempt to open non blocking the access dev */ /* Attempt to open non blocking the access dev */
fp = open(buffer_access, O_RDONLY | O_NONBLOCK); fp = open(buffer_access, O_RDONLY | O_NONBLOCK);
if (fp == -1) { /*If it isn't there make the node */ if (fp == -1) { /* If it isn't there make the node */
printf("Failed to open %s\n", buffer_access); printf("Failed to open %s\n", buffer_access);
ret = -errno; ret = -errno;
goto error_free_buffer_access; goto error_free_buffer_access;
@ -297,16 +297,16 @@ int main(int argc, char **argv)
} }
for (i = 0; i < read_size/scan_size; i++) for (i = 0; i < read_size/scan_size; i++)
process_scan(data + scan_size*i, process_scan(data + scan_size*i,
infoarray, channels,
num_channels); num_channels);
} }
/* Stop the ring buffer */ /* Stop the buffer */
ret = write_sysfs_int("enable", buf_dir_name, 0); ret = write_sysfs_int("enable", buf_dir_name, 0);
if (ret < 0) if (ret < 0)
goto error_close_buffer_access; goto error_close_buffer_access;
/* Disconnect from the trigger - just write a dummy name.*/ /* Disconnect the trigger - just write a dummy name. */
write_sysfs_string("trigger/current_trigger", write_sysfs_string("trigger/current_trigger",
dev_dir_name, "NULL"); dev_dir_name, "NULL");