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V4L/DVB: gspca_xirlink_cit: support bandwidth changing for devices with 1 alt setting

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Some xirlink_cit models have only 1 alt setting, but the actual used
bandwidth can be programmed through a register use this to allow streaming
while other isoc streams (for example sound) are active at the same time.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans de Goede 2010-09-05 07:03:48 -03:00 committed by Mauro Carvalho Chehab
parent 55c1b7d357
commit 59f8b0bf3c
1 changed files with 50 additions and 4 deletions
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54
drivers/media/video/gspca/xirlink_cit.c
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@ -2758,6 +2758,25 @@ static int sd_start(struct gspca_dev *gspca_dev)
return 0;
}
static int sd_isoc_nego(struct gspca_dev *gspca_dev)
{
int ret, packet_size;
struct usb_host_interface *alt;
alt = &gspca_dev->dev->config->intf_cache[0]->altsetting[1];
packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize);
packet_size -= 100;
if (packet_size < 300)
return -EIO;
alt->endpoint[0].desc.wMaxPacketSize = cpu_to_le16(packet_size);
ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, 1);
if (ret < 0)
PDEBUG(D_ERR|D_STREAM, "set alt 1 err %d", ret);
return ret;
}
static void sd_stopN(struct gspca_dev *gspca_dev)
{
cit_write_reg(gspca_dev, 0x0000, 0x010c);
@ -2766,12 +2785,15 @@ static void sd_stopN(struct gspca_dev *gspca_dev)
static void sd_stop0(struct gspca_dev *gspca_dev)
{
struct sd *sd = (struct sd *) gspca_dev;
struct usb_host_interface *alt;
/* We cannot use gspca_dev->present here as that is not set when
sd_init gets called and we get called from sd_init */
if (!gspca_dev->dev)
return;
alt = &gspca_dev->dev->config->intf_cache[0]->altsetting[1];
switch (sd->model) {
case CIT_MODEL0:
/* HDG windows does this, but it causes the cams autogain to
@ -2826,6 +2848,10 @@ static void sd_stop0(struct gspca_dev *gspca_dev)
restarting the stream after this */
/* cit_write_reg(gspca_dev, 0x0000, 0x0112); */
cit_write_reg(gspca_dev, 0x00c0, 0x0100);
/* Start isoc bandwidth "negotiation" at max isoc bandwith
next stream start */
alt->endpoint[0].desc.wMaxPacketSize = cpu_to_le16(1022);
break;
}
}
@ -3135,6 +3161,19 @@ static const struct sd_desc sd_desc = {
.pkt_scan = sd_pkt_scan,
};
static const struct sd_desc sd_desc_isoc_nego = {
.name = MODULE_NAME,
.ctrls = sd_ctrls,
.nctrls = ARRAY_SIZE(sd_ctrls),
.config = sd_config,
.init = sd_init,
.start = sd_start,
.isoc_nego = sd_isoc_nego,
.stopN = sd_stopN,
.stop0 = sd_stop0,
.pkt_scan = sd_pkt_scan,
};
/* -- module initialisation -- */
static const __devinitdata struct usb_device_id device_table[] = {
{ USB_DEVICE_VER(0x0545, 0x8080, 0x0001, 0x0001), .driver_info = CIT_MODEL0 },
@ -3152,6 +3191,8 @@ MODULE_DEVICE_TABLE(usb, device_table);
static int sd_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
const struct sd_desc *desc = &sd_desc;
switch (id->driver_info) {
case CIT_MODEL0:
case CIT_MODEL1:
@ -3159,16 +3200,21 @@ static int sd_probe(struct usb_interface *intf,
return -ENODEV;
break;
case CIT_MODEL2:
case CIT_MODEL3:
case CIT_MODEL4:
case CIT_IBM_NETCAM_PRO:
if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
return -ENODEV;
break;
case CIT_MODEL3:
if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
return -ENODEV;
/* FIXME this likely applies to all model3 cams and probably
to other models too. */
if (ibm_netcam_pro)
desc = &sd_desc_isoc_nego;
break;
}
return gspca_dev_probe2(intf, id, &sd_desc, sizeof(struct sd),
THIS_MODULE);
return gspca_dev_probe2(intf, id, desc, sizeof(struct sd), THIS_MODULE);
}
static struct usb_driver sd_driver = {