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authorHans Verkuil <hans.verkuil@cisco.com>2013-12-14 08:28:36 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-01-07 07:42:19 -0200
commit09092787e0cf66e705b0d744f5f0c3b2b6495559 (patch)
tree7200db1a6dd03c476e35f106a4f30bdb2f1bba55 /drivers/media/i2c
parenta101b947d405b5c2c94f260867074a4466b7cbea (diff)
[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: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/i2c')
-rw-r--r--drivers/media/i2c/saa6588.c45
1 files changed, 25 insertions, 20 deletions
diff --git a/drivers/media/i2c/saa6588.c b/drivers/media/i2c/saa6588.c
index 21cf940f5ea0..2960b5a8362a 100644
--- a/drivers/media/i2c/saa6588.c
+++ b/drivers/media/i2c/saa6588.c
@@ -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;
+ spin_unlock_irqrestore(&s->lock, flags);
- 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;