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ALSA: line6: Claim pod x3 usb data interface

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Userspace apps have to claim USB interfaces before using endpoints in
them (drivers/usb/core/devio.c:checkintf()). It's a lock mechanism so
that two "drivers" don't steal data from each other. Kernel drivers don't
have to claim interfaces to work - but they should, to lock out userspace.

While there, fix line6_properties struct to match checkpatch.pl.

Signed-off-by: Andrej Krutak <dev@andree.sk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Andrej Krutak 2016-11-29 22:12:51 +01:00 committed by Takashi Iwai
parent e59d8bb574
commit fc90172ba2
2 changed files with 31 additions and 4 deletions
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9
sound/usb/line6/driver.h
View file

@ -98,10 +98,11 @@ struct line6_properties {
int altsetting;
unsigned ep_ctrl_r;
unsigned ep_ctrl_w;
unsigned ep_audio_r;
unsigned ep_audio_w;
unsigned int ctrl_if;
unsigned int ep_ctrl_r;
unsigned int ep_ctrl_w;
unsigned int ep_audio_r;
unsigned int ep_audio_w;
};
/* Capability bits */

26
sound/usb/line6/podhd.c
View file

@ -153,6 +153,7 @@ static struct line6_pcm_properties podx3_pcm_properties = {
.rats = &podhd_ratden},
.bytes_per_channel = 3 /* SNDRV_PCM_FMTBIT_S24_3LE */
};
static struct usb_driver podhd_driver;
static void podhd_startup_start_workqueue(unsigned long data);
static void podhd_startup_workqueue(struct work_struct *work);
@ -291,8 +292,14 @@ static void podhd_disconnect(struct usb_line6 *line6)
struct usb_line6_podhd *pod = (struct usb_line6_podhd *)line6;
if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
struct usb_interface *intf;
del_timer_sync(&pod->startup_timer);
cancel_work_sync(&pod->startup_work);
intf = usb_ifnum_to_if(line6->usbdev,
pod->line6.properties->ctrl_if);
usb_driver_release_interface(&podhd_driver, intf);
}
}
@ -304,10 +311,27 @@ static int podhd_init(struct usb_line6 *line6,
{
int err;
struct usb_line6_podhd *pod = (struct usb_line6_podhd *) line6;
struct usb_interface *intf;
line6->disconnect = podhd_disconnect;
if (pod->line6.properties->capabilities & LINE6_CAP_CONTROL) {
/* claim the data interface */
intf = usb_ifnum_to_if(line6->usbdev,
pod->line6.properties->ctrl_if);
if (!intf) {
dev_err(pod->line6.ifcdev, "interface %d not found\n",
pod->line6.properties->ctrl_if);
return -ENODEV;
}
err = usb_driver_claim_interface(&podhd_driver, intf, NULL);
if (err != 0) {
dev_err(pod->line6.ifcdev, "can't claim interface %d, error %d\n",
pod->line6.properties->ctrl_if, err);
return err;
}
/* create sysfs entries: */
err = snd_card_add_dev_attr(line6->card, &podhd_dev_attr_group);
if (err < 0)
@ -406,6 +430,7 @@ static const struct line6_properties podhd_properties_table[] = {
.altsetting = 1,
.ep_ctrl_r = 0x81,
.ep_ctrl_w = 0x01,
.ctrl_if = 1,
.ep_audio_r = 0x86,
.ep_audio_w = 0x02,
},
@ -417,6 +442,7 @@ static const struct line6_properties podhd_properties_table[] = {
.altsetting = 1,
.ep_ctrl_r = 0x81,
.ep_ctrl_w = 0x01,
.ctrl_if = 1,
.ep_audio_r = 0x86,
.ep_audio_w = 0x02,
},