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[media] em28xx: fix usb alternate setting for analog and digital video endpoints > 0 

The current code assumes that the analog + digital video endpoints are always at
interface number 0 when changing the alternate setting.
This seems to work fine for most existing devices.
However, at least the SpeedLink VAD Laplace webcam has the video endpoint on
interface number 3 (which fortunately doesn't cause any trouble because ist uses
bulk transfers only).
We already consider the actual interface number for audio endpoints, so
rename the the audio_ifnum variable and use it for all device types.
Also get get rid of a pointless (ifnum < 0) in em28xx-audio.

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Frank Schaefer 2014-01-13 19:02:06 -03:00 committed by Mauro Carvalho Chehab
parent 8068eb885a
commit 961717b41b
5 changed files with 13 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/media/usb/em28xx/em28xx-audio.c
View File

@ -266,7 +266,7 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
dprintk("opening device and trying to acquire exclusive lock\n");
runtime->hw = snd_em28xx_hw_capture;
if ((dev->alt == 0 || dev->audio_ifnum) && dev->adev.users == 0) {
if ((dev->alt == 0 || dev->ifnum) && dev->adev.users == 0) {
int nonblock = !!(substream->f_flags & O_NONBLOCK);
if (nonblock) {
@ -274,14 +274,14 @@ static int snd_em28xx_capture_open(struct snd_pcm_substream *substream)
return -EAGAIN;
} else
mutex_lock(&dev->lock);
if (dev->audio_ifnum)
if (dev->ifnum)
dev->alt = 1;
else
dev->alt = 7;
dprintk("changing alternate number on interface %d to %d\n",
dev->audio_ifnum, dev->alt);
usb_set_interface(dev->udev, dev->audio_ifnum, dev->alt);
dev->ifnum, dev->alt);
usb_set_interface(dev->udev, dev->ifnum, dev->alt);
/* Sets volume, mute, etc */
dev->mute = 0;
@ -733,16 +733,16 @@ static int em28xx_audio_urb_init(struct em28xx *dev)
int urb_size, bytes_per_transfer;
u8 alt;
if (dev->audio_ifnum)
if (dev->ifnum)
alt = 1;
else
alt = 7;
intf = usb_ifnum_to_if(dev->udev, dev->audio_ifnum);
intf = usb_ifnum_to_if(dev->udev, dev->ifnum);
if (intf->num_altsetting <= alt) {
em28xx_errdev("alt %d doesn't exist on interface %d\n",
dev->audio_ifnum, alt);
dev->ifnum, alt);
return -ENODEV;
}
@ -766,7 +766,7 @@ static int em28xx_audio_urb_init(struct em28xx *dev)
em28xx_info("Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n",
EM28XX_EP_AUDIO, usb_speed_string(dev->udev->speed),
dev->audio_ifnum, alt,
dev->ifnum, alt,
interval,
ep_size);
@ -877,7 +877,7 @@ static int em28xx_audio_init(struct em28xx *dev)
static int devnr;
int err;
if (!dev->has_alsa_audio || dev->audio_ifnum < 0) {
if (!dev->has_alsa_audio) {
/* This device does not support the extension (in this case
the device is expecting the snd-usb-audio module or
doesn't have analog audio support at all) */

2
drivers/media/usb/em28xx/em28xx-cards.c
View File

@ -3274,7 +3274,7 @@ static int em28xx_usb_probe(struct usb_interface *interface,
dev->has_alsa_audio = has_audio;
dev->audio_mode.has_audio = has_audio;
dev->has_video = has_video;
dev->audio_ifnum = ifnum;
dev->ifnum = ifnum;
/* Checks if audio is provided by some interface */
for (i = 0; i < udev->config->desc.bNumInterfaces; i++) {

2
drivers/media/usb/em28xx/em28xx-dvb.c
View File

@ -203,7 +203,7 @@ static int em28xx_start_streaming(struct em28xx_dvb *dvb)
dvb_alt = dev->dvb_alt_isoc;
}
usb_set_interface(dev->udev, 0, dvb_alt);
usb_set_interface(dev->udev, dev->ifnum, dvb_alt);
rc = em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
if (rc < 0)
return rc;

2
drivers/media/usb/em28xx/em28xx-video.c
View File

@ -383,7 +383,7 @@ static int em28xx_set_alternate(struct em28xx *dev)
}
em28xx_videodbg("setting alternate %d with wMaxPacketSize=%u\n",
dev->alt, dev->max_pkt_size);
errCode = usb_set_interface(dev->udev, 0, dev->alt);
errCode = usb_set_interface(dev->udev, dev->ifnum, dev->alt);
if (errCode < 0) {
em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
dev->alt, errCode);

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

@ -549,8 +549,6 @@ struct em28xx {
unsigned int has_alsa_audio:1;
unsigned int is_audio_only:1;
int audio_ifnum;
struct v4l2_device v4l2_dev;
struct v4l2_ctrl_handler ctrl_handler;
struct v4l2_clk *clk;
@ -664,6 +662,7 @@ struct em28xx {
/* usb transfer */
struct usb_device *udev; /* the usb device */
u8 ifnum; /* number of the assigned usb interface */
u8 analog_ep_isoc; /* address of isoc endpoint for analog */
u8 analog_ep_bulk; /* address of bulk endpoint for analog */
u8 dvb_ep_isoc; /* address of isoc endpoint for DVB */