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Commit 09092787 authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

[media] saa6588: add support for non-blocking mode 



saa6588 always blocked while waiting for data, even if the filehandle
was in non-blocking mode.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent a101b947

drivers/media/i2c/saa6588.c

+25 −20
Original line number Diff line number Diff line
@@ -150,14 +150,14 @@ static inline struct saa6588 *to_saa6588(struct v4l2_subdev *sd) 


/* ---------------------------------------------------------------------- */



static int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf)

static bool block_from_buf(struct saa6588 *s, unsigned char *buf)

{

	int i;



	if (s->rd_index == s->wr_index) {

		if (debug > 2)

			dprintk(PREFIX "Read: buffer empty.\n");

		return 0;

		return false;

	}



	if (debug > 2) {
@@ -166,8 +166,7 @@ static int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf) 
			dprintk("0x%02x ", s->buffer[i]);

	}



	if (copy_to_user(user_buf, &s->buffer[s->rd_index], 3))

		return -EFAULT;

	memcpy(buf, &s->buffer[s->rd_index], 3);



	s->rd_index += 3;

	if (s->rd_index >= s->buf_size)
@@ -177,22 +176,22 @@ static int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf) 
	if (debug > 2)

		dprintk("%d blocks total.\n", s->block_count);



	return 1;

	return true;

}



static void read_from_buf(struct saa6588 *s, struct saa6588_command *a)

{

	unsigned long flags;



	unsigned char __user *buf_ptr = a->buffer;

	unsigned int i;

	unsigned char buf[3];

	unsigned long flags;

	unsigned int rd_blocks;

	unsigned int i;



	a->result = 0;

	if (!a->buffer)

		return;



	while (!s->data_available_for_read) {

	while (!a->nonblocking && !s->data_available_for_read) {

		int ret = wait_event_interruptible(s->read_queue,

					     s->data_available_for_read);

		if (ret == -ERESTARTSYS) {
@@ -201,24 +200,31 @@ static void read_from_buf(struct saa6588 *s, struct saa6588_command *a) 
		}

	}



	spin_lock_irqsave(&s->lock, flags);

	rd_blocks = a->block_count;

	spin_lock_irqsave(&s->lock, flags);

	if (rd_blocks > s->block_count)

		rd_blocks = s->block_count;



	if (!rd_blocks) {

	spin_unlock_irqrestore(&s->lock, flags);



	if (!rd_blocks)

		return;

	}



	for (i = 0; i < rd_blocks; i++) {

		if (block_to_user_buf(s, buf_ptr)) {

			buf_ptr += 3;

			a->result++;

		} else

		bool got_block;



		spin_lock_irqsave(&s->lock, flags);

		got_block = block_from_buf(s, buf);

		spin_unlock_irqrestore(&s->lock, flags);

		if (!got_block)

			break;

		if (copy_to_user(buf_ptr, buf, 3)) {

			a->result = -EFAULT;

			return;

		}

		buf_ptr += 3;

		a->result += 3;

	}

	a->result *= 3;

	spin_lock_irqsave(&s->lock, flags);

	s->data_available_for_read = (s->block_count > 0);

	spin_unlock_irqrestore(&s->lock, flags);

}
@@ -408,9 +414,8 @@ static long saa6588_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg) 
		/* --- poll() for /dev/radio --- */

	case SAA6588_CMD_POLL:

		a->result = 0;

		if (s->data_available_for_read) {

		if (s->data_available_for_read)

			a->result |= POLLIN | POLLRDNORM;

		}

		poll_wait(a->instance, &s->read_queue, a->event_list);

		break;

drivers/media/pci/bt8xx/bttv-driver.c

+3 −1
Original line number Diff line number Diff line
@@ -3266,7 +3266,9 @@ static ssize_t radio_read(struct file *file, char __user *data, 
	struct bttv_fh *fh = file->private_data;

	struct bttv *btv = fh->btv;

	struct saa6588_command cmd;



	cmd.block_count = count / 3;

	cmd.nonblocking = file->f_flags & O_NONBLOCK;

	cmd.buffer = data;

	cmd.instance = file;

	cmd.result = -ENODEV;

drivers/media/pci/saa7134/saa7134-video.c

+1 −0
Original line number Diff line number Diff line
@@ -1285,6 +1285,7 @@ static ssize_t radio_read(struct file *file, char __user *data, 
	struct saa6588_command cmd;



	cmd.block_count = count/3;

	cmd.nonblocking = file->f_flags & O_NONBLOCK;

	cmd.buffer = data;

	cmd.instance = file;

	cmd.result = -ENODEV;

include/media/saa6588.h

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 


struct saa6588_command {

	unsigned int  block_count;

	bool          nonblocking;

	int           result;

	unsigned char __user *buffer;

	struct file   *instance;