staging: iio: generic_buffer cleanup (d8da0eee) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/staging/iio/Documentation/generic_buffer.c

+30 −30

Original line number	Diff line number	Diff line
		@@ -34,7 +34,7 @@
		/**
		* size_from_channelarray() - calculate the storage size of a scan
		* @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
		* 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)
		{
		/* First swap if incorrect endian */

		if (info->be)
		input = be16toh((uint16_t)input);
		else
		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;
		if (info->is_signed) {
		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
		* @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
		* location offsets.
		* @num_channels: the number of active channels
		* @num_channels: number of channels
		**/
		void process_scan(char *data,
		struct iio_channel_info *infoarray,
		struct iio_channel_info *channels,
		int num_channels)
		{
		int k;
		for (k = 0; k < num_channels; k++)
		switch (infoarray[k].bytes) {
		switch (channels[k].bytes) {
		/* only a few cases implemented so far */
		case 2:
		print2byte((uint16_t )(data + infoarray[k].location),
		&infoarray[k]);
		print2byte((uint16_t )(data + channels[k].location),
		&channels[k]);
		break;
		case 8:
		if (infoarray[k].is_signed) {
		if (channels[k].is_signed) {
		int64_t val = (int64_t )
		(data +
		infoarray[k].location);
		if ((val >> infoarray[k].bits_used) & 1)
		val = (val & infoarray[k].mask) \|
		~infoarray[k].mask;
		channels[k].location);
		if ((val >> channels[k].bits_used) & 1)
		val = (val & channels[k].mask) \|
		~channels[k].mask;
		/* special case for timestamp */
		if (infoarray[k].scale == 1.0f &&
		infoarray[k].offset == 0.0f)
		if (channels[k].scale == 1.0f &&
		channels[k].offset == 0.0f)
		printf(" %lld", val);
		else
		printf("%05f ", ((float)val +
		infoarray[k].offset)*
		infoarray[k].scale);
		channels[k].offset)*
		channels[k].scale);
		}
		break;
		default:
		@@ -129,7 +130,6 @@ int main(int argc, char **argv)
		unsigned long timedelay = 1000000;
		unsigned long buf_len = 128;


		int ret, c, i, j, toread;
		int fp;

		@@ -146,7 +146,7 @@ int main(int argc, char **argv)
		int noevents = 0;
		char *dummy;

		struct iio_channel_info *infoarray;
		struct iio_channel_info *channels;

		while ((c = getopt(argc, argv, "l:w:c:et:n:")) != -1) {
		switch (c) {
		@@ -189,7 +189,7 @@ int main(int argc, char **argv)
		asprintf(&dev_dir_name, "%siio:device%d", iio_dir, dev_num);
		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
		* number found above
		*/
		@@ -214,7 +214,7 @@ int main(int argc, char **argv)
		* Parse the files in scan_elements to identify what channels are
		* present
		*/
		ret = build_channel_array(dev_dir_name, &infoarray, &num_channels);
		ret = build_channel_array(dev_dir_name, &channels, &num_channels);
		if (ret) {
		printf("Problem reading scan element information\n");
		printf("diag %s\n", dev_dir_name);
		@@ -233,7 +233,7 @@ int main(int argc, char **argv)
		goto error_free_triggername;
		}
		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",
		dev_dir_name,
		trigger_name);
		@@ -251,7 +251,7 @@ int main(int argc, char **argv)
		ret = write_sysfs_int("enable", buf_dir_name, 1);
		if (ret < 0)
		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);
		if (!data) {
		ret = -ENOMEM;
		@@ -297,16 +297,16 @@ int main(int argc, char **argv)
		}
		for (i = 0; i < read_size/scan_size; i++)
		process_scan(data + scan_size*i,
		infoarray,
		channels,
		num_channels);
		}

		/* Stop the ring buffer */
		/* Stop the buffer */
		ret = write_sysfs_int("enable", buf_dir_name, 0);
		if (ret < 0)
		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",
		dev_dir_name, "NULL");