msm: usbaudio: Add support for USB headset detection
- During bootup, create a file system storing the
information about usb device state and name, and
broadcast the message to userspace whenever the
device is plugged or unplugged.
- Register the device at USB sound card initialization
for creating file system and toggle the state in that
filesystem when USB is plugged/unplugged. This will
also send a message to user space informing it about
state change.
Change-Id: Icd78273bb765a26bbc70725afebe8955de8f7315
Signed-off-by: Harmandeep Singh <hsingh@codeaurora.org>
diff --git a/sound/usb/card.c b/sound/usb/card.c
index 57a8e2d..12dfa0a 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -47,6 +47,7 @@
#include <linux/mutex.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
+#include <linux/switch.h>
#include <sound/control.h>
#include <sound/core.h>
@@ -85,6 +86,7 @@
static int async_unlink = 1;
static int device_setup[SNDRV_CARDS]; /* device parameter for this card */
static int ignore_ctl_error;
+struct switch_dev *usbaudiosdev;
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for the USB audio adapter.");
@@ -418,6 +420,7 @@
}
snd_usb_audio_create_proc(chip);
+ switch_set_state(usbaudiosdev, 1);
*rchip = chip;
return 0;
@@ -580,6 +583,7 @@
mutex_unlock(&chip->shutdown_mutex);
mutex_unlock(®ister_mutex);
}
+ switch_set_state(usbaudiosdev, 0);
}
/*
@@ -712,16 +716,27 @@
static int __init snd_usb_audio_init(void)
{
+ int err;
if (nrpacks < 1 || nrpacks > MAX_PACKS) {
printk(KERN_WARNING "invalid nrpacks value.\n");
return -EINVAL;
}
+
+ usbaudiosdev = kzalloc(sizeof(usbaudiosdev), GFP_KERNEL);
+ usbaudiosdev->name = "usb_audio";
+
+ err = switch_dev_register(usbaudiosdev);
+ if (err)
+ pr_err("Usb-audio switch registration failed\n");
+ else
+ pr_debug("usb hs_detected\n");
return usb_register(&usb_audio_driver);
}
static void __exit snd_usb_audio_cleanup(void)
{
usb_deregister(&usb_audio_driver);
+ kfree(usbaudiosdev);
}
module_init(snd_usb_audio_init);