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V4L/DVB (13327): em28xx: fix alt modprobe parameter

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It seems that some patch broke alt modprobe parameter. Fix it to allow
changing alternate interfaces during module load and at runtime.

If changed during runtime, you'll need to stop a and restart stream for
the parameter to be used.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2009-11-07 14:51:01 -03:00
parent 8337fc3053
commit fc099f0e0e
2 changed files with 12 additions and 4 deletions
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13
drivers/media/video/em28xx/em28xx-core.c
View File

@ -50,7 +50,7 @@ MODULE_PARM_DESC(reg_debug, "enable debug messages [URB reg]");
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __func__ , ##arg); } while (0)
static int alt = EM28XX_PINOUT;
static int alt;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
@ -778,6 +778,16 @@ int em28xx_set_alternate(struct em28xx *dev)
int i;
unsigned int min_pkt_size = dev->width * 2 + 4;
/*
* alt = 0 is used only for control messages, so, only values
* greater than 0 can be used for streaming.
*/
if (alt && alt < dev->num_alt) {
em28xx_coredbg("alternate forced to %d\n", dev->alt);
dev->alt = alt;
goto set_alt;
}
/* When image size is bigger than a certain value,
the frame size should be increased, otherwise, only
green screen will be received.
@ -798,6 +808,7 @@ int em28xx_set_alternate(struct em28xx *dev)
dev->alt = i;
}
set_alt:
if (dev->alt != prev_alt) {
em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
min_pkt_size, dev->alt);

3
drivers/media/video/em28xx/em28xx.h
View File

@ -143,9 +143,6 @@
*/
#define EM28XX_NUM_PACKETS 40
/* default alternate; 0 means choose the best */
#define EM28XX_PINOUT 0
#define EM28XX_INTERLACED_DEFAULT 1
/*