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authorAndrej Krutak <dev@andree.sk>2016-11-29 22:12:51 +0100
committerTakashi Iwai <tiwai@suse.de>2016-11-29 22:16:14 +0100
commitfc90172ba283b598b5497e968de47e3bc2800ed5 (patch)
tree425c4bf6bb8de1f4f0592b0e388a3c6694853f6b /sound/usb
parente59d8bb574f6d8097e7e14981440dc37425fddc6 (diff)
downloadlinux-fc90172ba283b598b5497e968de47e3bc2800ed5.tar.bz2
ALSA: line6: Claim pod x3 usb data interface
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>
Diffstat (limited to 'sound/usb')
-rw-r--r--sound/usb/line6/driver.h9
-rw-r--r--sound/usb/line6/podhd.c26
2 files changed, 31 insertions, 4 deletions
diff --git a/sound/usb/line6/driver.h b/sound/usb/line6/driver.h
index 7e3a3aada222..a5c2e9ae5f17 100644
--- a/sound/usb/line6/driver.h
+++ b/sound/usb/line6/driver.h
@@ -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 */
diff --git a/sound/usb/line6/podhd.c b/sound/usb/line6/podhd.c
index 49cd4a65e390..6ab23e5aee71 100644
--- a/sound/usb/line6/podhd.c
+++ b/sound/usb/line6/podhd.c
@@ -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,
},