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Commit 72fd9fac authored by H Hartley Sweeten's avatar H Hartley Sweeten Committed by Greg Kroah-Hartman
Browse files

staging: comedi: cleanup sysfs functions 



Make the comedi sysfs functions a bit more concise by shortening
some of the verbose variable names and reusing some of the
variables that were used for intermediate calculations.

Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 4e2f002f

drivers/staging/comedi/comedi_fops.c

+76 −134
Original line number Diff line number Diff line
@@ -172,28 +172,19 @@ static int resize_async_buffer(struct comedi_device *dev, 


/* sysfs attribute files */



static const unsigned bytes_per_kibi = 1024;



static ssize_t show_max_read_buffer_kb(struct device *dev,

				       struct device_attribute *attr, char *buf)

{

	ssize_t retval;

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned max_buffer_size_kb = 0;

	struct comedi_subdevice *const read_subdevice =

	    comedi_get_read_subdevice(info);

	struct comedi_subdevice *s = comedi_get_read_subdevice(info);

	unsigned int size = 0;



	mutex_lock(&info->device->mutex);

	if (read_subdevice &&

	    (read_subdevice->subdev_flags & SDF_CMD_READ) &&

	    read_subdevice->async) {

		max_buffer_size_kb = read_subdevice->async->max_bufsize /

		    bytes_per_kibi;

	}

	retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);

	if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)

		size = s->async->max_bufsize / 1024;

	mutex_unlock(&info->device->mutex);



	return retval;

	return snprintf(buf, PAGE_SIZE, "%i\n", size);

}



static ssize_t store_max_read_buffer_kb(struct device *dev,
@@ -201,52 +192,40 @@ static ssize_t store_max_read_buffer_kb(struct device *dev, 
					const char *buf, size_t count)

{

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned int new_max_size_kb;

	unsigned int new_max_size;

	int ret;

	struct comedi_subdevice *const read_subdevice =

	    comedi_get_read_subdevice(info);



	ret = kstrtouint(buf, 10, &new_max_size_kb);

	if (ret)

		return ret;

	if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))

	struct comedi_subdevice *s = comedi_get_read_subdevice(info);

	unsigned int size;

	int err;



	err = kstrtouint(buf, 10, &size);

	if (err)

		return err;

	if (size > (UINT_MAX / 1024))

		return -EINVAL;

	new_max_size = new_max_size_kb * bytes_per_kibi;

	size *= 1024;



	mutex_lock(&info->device->mutex);

	if (read_subdevice == NULL ||

	    (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||

	    read_subdevice->async == NULL) {

		mutex_unlock(&info->device->mutex);

		return -EINVAL;

	}

	read_subdevice->async->max_bufsize = new_max_size;

	if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)

		s->async->max_bufsize = size;

	else

		err = -EINVAL;

	mutex_unlock(&info->device->mutex);



	return count;

	return err ? err : count;

}



static ssize_t show_read_buffer_kb(struct device *dev,

				   struct device_attribute *attr, char *buf)

{

	ssize_t retval;

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned buffer_size_kb = 0;

	struct comedi_subdevice *const read_subdevice =

	    comedi_get_read_subdevice(info);

	struct comedi_subdevice *s = comedi_get_read_subdevice(info);

	unsigned int size = 0;



	mutex_lock(&info->device->mutex);

	if (read_subdevice &&

	    (read_subdevice->subdev_flags & SDF_CMD_READ) &&

	    read_subdevice->async) {

		buffer_size_kb = read_subdevice->async->prealloc_bufsz /

		    bytes_per_kibi;

	}

	retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);

	if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)

		size = s->async->prealloc_bufsz / 1024;

	mutex_unlock(&info->device->mutex);



	return retval;

	return snprintf(buf, PAGE_SIZE, "%i\n", size);

}



static ssize_t store_read_buffer_kb(struct device *dev,
@@ -254,57 +233,41 @@ static ssize_t store_read_buffer_kb(struct device *dev, 
				    const char *buf, size_t count)

{

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned int new_size_kb;

	unsigned int new_size;

	int retval;

	int ret;

	struct comedi_subdevice *const read_subdevice =

	    comedi_get_read_subdevice(info);



	ret = kstrtouint(buf, 10, &new_size_kb);

	if (ret)

		return ret;

	if (new_size_kb > (UINT_MAX / bytes_per_kibi))

	struct comedi_subdevice *s = comedi_get_read_subdevice(info);

	unsigned int size;

	int err;



	err = kstrtouint(buf, 10, &size);

	if (err)

		return err;

	if (size > (UINT_MAX / 1024))

		return -EINVAL;

	new_size = new_size_kb * bytes_per_kibi;

	size *= 1024;



	mutex_lock(&info->device->mutex);

	if (read_subdevice == NULL ||

	    (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||

	    read_subdevice->async == NULL) {

		mutex_unlock(&info->device->mutex);

		return -EINVAL;

	}

	retval = resize_async_buffer(info->device, read_subdevice,

				     read_subdevice->async, new_size);

	if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)

		err = resize_async_buffer(info->device, s, s->async, size);

	else

		err = -EINVAL;

	mutex_unlock(&info->device->mutex);



	if (retval < 0)

		return retval;

	return count;

	return err ? err : count;

}



static ssize_t show_max_write_buffer_kb(struct device *dev,

					struct device_attribute *attr,

					char *buf)

{

	ssize_t retval;

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned max_buffer_size_kb = 0;

	struct comedi_subdevice *const write_subdevice =

	    comedi_get_write_subdevice(info);

	struct comedi_subdevice *s = comedi_get_write_subdevice(info);

	unsigned int size = 0;



	mutex_lock(&info->device->mutex);

	if (write_subdevice &&

	    (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&

	    write_subdevice->async) {

		max_buffer_size_kb = write_subdevice->async->max_bufsize /

		    bytes_per_kibi;

	}

	retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);

	if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)

		size = s->async->max_bufsize / 1024;

	mutex_unlock(&info->device->mutex);



	return retval;

	return snprintf(buf, PAGE_SIZE, "%i\n", size);

}



static ssize_t store_max_write_buffer_kb(struct device *dev,
@@ -312,52 +275,40 @@ static ssize_t store_max_write_buffer_kb(struct device *dev, 
					 const char *buf, size_t count)

{

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned int new_max_size_kb;

	unsigned int new_max_size;

	int ret;

	struct comedi_subdevice *const write_subdevice =

	    comedi_get_write_subdevice(info);



	ret = kstrtouint(buf, 10, &new_max_size_kb);

	if (ret)

		return ret;

	if (new_max_size_kb > (UINT_MAX / bytes_per_kibi))

	struct comedi_subdevice *s = comedi_get_write_subdevice(info);

	unsigned int size;

	int err;



	err = kstrtouint(buf, 10, &size);

	if (err)

		return err;

	if (size > (UINT_MAX / 1024))

		return -EINVAL;

	new_max_size = new_max_size_kb * bytes_per_kibi;

	size *= 1024;



	mutex_lock(&info->device->mutex);

	if (write_subdevice == NULL ||

	    (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||

	    write_subdevice->async == NULL) {

		mutex_unlock(&info->device->mutex);

		return -EINVAL;

	}

	write_subdevice->async->max_bufsize = new_max_size;

	if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)

		s->async->max_bufsize = size;

	else

		err = -EINVAL;

	mutex_unlock(&info->device->mutex);



	return count;

	return err ? err : count;

}



static ssize_t show_write_buffer_kb(struct device *dev,

				    struct device_attribute *attr, char *buf)

{

	ssize_t retval;

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned buffer_size_kb = 0;

	struct comedi_subdevice *const write_subdevice =

	    comedi_get_write_subdevice(info);

	struct comedi_subdevice *s = comedi_get_write_subdevice(info);

	unsigned int size = 0;



	mutex_lock(&info->device->mutex);

	if (write_subdevice &&

	    (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&

	    write_subdevice->async) {

		buffer_size_kb = write_subdevice->async->prealloc_bufsz /

		    bytes_per_kibi;

	}

	retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);

	if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)

		size = s->async->prealloc_bufsz / 1024;

	mutex_unlock(&info->device->mutex);



	return retval;

	return snprintf(buf, PAGE_SIZE, "%i\n", size);

}



static ssize_t store_write_buffer_kb(struct device *dev,
@@ -365,34 +316,25 @@ static ssize_t store_write_buffer_kb(struct device *dev, 
				     const char *buf, size_t count)

{

	struct comedi_device_file_info *info = dev_get_drvdata(dev);

	unsigned int new_size_kb;

	unsigned int new_size;

	int retval;

	int ret;

	struct comedi_subdevice *const write_subdevice =

	    comedi_get_write_subdevice(info);



	ret = kstrtouint(buf, 10, &new_size_kb);

	if (ret)

		return ret;

	if (new_size_kb > (UINT_MAX / bytes_per_kibi))

	struct comedi_subdevice *s = comedi_get_write_subdevice(info);

	unsigned int size;

	int err;



	err = kstrtouint(buf, 10, &size);

	if (err)

		return err;

	if (size > (UINT_MAX / 1024))

		return -EINVAL;

	new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;

	size *= 1024;



	mutex_lock(&info->device->mutex);

	if (write_subdevice == NULL ||

	    (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||

	    write_subdevice->async == NULL) {

		mutex_unlock(&info->device->mutex);

		return -EINVAL;

	}

	retval = resize_async_buffer(info->device, write_subdevice,

				     write_subdevice->async, new_size);

	if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)

		err = resize_async_buffer(info->device, s, s->async, size);

	else

		err = -EINVAL;

	mutex_unlock(&info->device->mutex);



	if (retval < 0)

		return retval;

	return count;

	return err ? err : count;

}



static struct device_attribute comedi_dev_attrs[] = {