diff options
| author | Andrej Krutak <dev@andree.sk> | 2016-11-29 22:12:51 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2016-11-29 22:16:14 +0100 |
| commit | fc90172ba283b598b5497e968de47e3bc2800ed5 (patch) | |
| tree | 425c4bf6bb8de1f4f0592b0e388a3c6694853f6b /sound | |
| parent | e59d8bb574f6d8097e7e14981440dc37425fddc6 (diff) | |
| download | linux-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')
| -rw-r--r-- | sound/usb/line6/driver.h | 9 | ||||
| -rw-r--r-- | sound/usb/line6/podhd.c | 26 |
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, }, |