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ALSA: line6: Minor refactoring 

Split some codes in the lengthy line6_probe().

Tested-by: Chris Rorvick <chris@rorvick.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-01-23 12:24:03 +01:00
parent f44edd7b2b
commit 644d90850c
1 changed files with 49 additions and 45 deletions
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94
sound/usb/line6/driver.c
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@ -448,6 +448,52 @@ static void line6_destruct(struct snd_card *card)
usb_put_dev(usbdev);
}
/* get data from endpoint descriptor (see usb_maxpacket): */
static void line6_get_interval(struct usb_line6 *line6)
{
struct usb_device *usbdev = line6->usbdev;
struct usb_host_endpoint *ep;
unsigned pipe = usb_rcvintpipe(usbdev, line6->properties->ep_ctrl_r);
unsigned epnum = usb_pipeendpoint(pipe);
ep = usbdev->ep_in[epnum];
if (ep) {
line6->interval = ep->desc.bInterval;
line6->max_packet_size = le16_to_cpu(ep->desc.wMaxPacketSize);
} else {
dev_err(line6->ifcdev,
"endpoint not available, using fallback values");
line6->interval = LINE6_FALLBACK_INTERVAL;
line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
}
}
static int line6_init_cap_control(struct usb_line6 *line6)
{
int ret;
/* initialize USB buffers: */
line6->buffer_listen = kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
if (!line6->buffer_listen)
return -ENOMEM;
line6->buffer_message = kmalloc(LINE6_MESSAGE_MAXLEN, GFP_KERNEL);
if (!line6->buffer_message)
return -ENOMEM;
line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
if (!line6->urb_listen)
return -ENOMEM;
ret = line6_start_listen(line6);
if (ret < 0) {
dev_err(line6->ifcdev, "cannot start listening: %d\n", ret);
return ret;
}
return 0;
}
/*
Probe USB device.
*/
@ -485,24 +531,7 @@ int line6_probe(struct usb_interface *interface,
line6->usbdev = usbdev;
line6->ifcdev = &interface->dev;
/* get data from endpoint descriptor (see usb_maxpacket): */
{
struct usb_host_endpoint *ep;
unsigned pipe = usb_rcvintpipe(usbdev, properties->ep_ctrl_r);
unsigned epnum = usb_pipeendpoint(pipe);
ep = usbdev->ep_in[epnum];
if (ep != NULL) {
line6->interval = ep->desc.bInterval;
line6->max_packet_size =
le16_to_cpu(ep->desc.wMaxPacketSize);
} else {
line6->interval = LINE6_FALLBACK_INTERVAL;
line6->max_packet_size = LINE6_FALLBACK_MAXPACKETSIZE;
dev_err(line6->ifcdev,
"endpoint not available, using fallback values");
}
}
line6_get_interval(line6);
ret = snd_card_new(line6->ifcdev,
SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
@ -525,34 +554,9 @@ int line6_probe(struct usb_interface *interface,
usb_get_dev(usbdev);
if (properties->capabilities & LINE6_CAP_CONTROL) {
/* initialize USB buffers: */
line6->buffer_listen =
kmalloc(LINE6_BUFSIZE_LISTEN, GFP_KERNEL);
if (line6->buffer_listen == NULL) {
ret = -ENOMEM;
ret = line6_init_cap_control(line6);
if (ret < 0)
goto err_destruct;
}
line6->buffer_message =
kmalloc(LINE6_MESSAGE_MAXLEN, GFP_KERNEL);
if (line6->buffer_message == NULL) {
ret = -ENOMEM;
goto err_destruct;
}
line6->urb_listen = usb_alloc_urb(0, GFP_KERNEL);
if (line6->urb_listen == NULL) {
ret = -ENOMEM;
goto err_destruct;
}
ret = line6_start_listen(line6);
if (ret < 0) {
dev_err(&interface->dev, "%s: usb_submit_urb failed\n",
__func__);
goto err_destruct;
}
}
/* initialize device data based on device: */