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| author | Mike Lockwood <lockwood@google.com> | 2012-05-11 09:00:40 -0700 |
|---|---|---|
| committer | Paul Kocialkowski <contact@paulk.fr> | 2014-05-02 20:52:57 +0200 |
| commit | 26513089f562c56a5ceac602ec197642b71b1f76 (patch) | |
| tree | 0415ecb00c46632bee651ba5f37a7677336504a6 | |
| parent | 15d7b5247d8a0d9575ac917313ae7b779ae1aa28 (diff) | |
| download | kernel_goldelico_gta04-26513089f562c56a5ceac602ec197642b71b1f76.zip kernel_goldelico_gta04-26513089f562c56a5ceac602ec197642b71b1f76.tar.gz kernel_goldelico_gta04-26513089f562c56a5ceac602ec197642b71b1f76.tar.bz2 | |
USB: gadget: Add ACCESSORY_SET_AUDIO_MODE control request and ioctl
The control request will be used by the host to enable/disable USB audio
and the ioctl will be used by userspace to read the audio mode
Change-Id: I81c38611b588451e80eacdccc417ca6e11c60cab
Signed-off-by: Mike Lockwood <lockwood@google.com>
| -rw-r--r-- | drivers/usb/gadget/f_accessory.c | 11 | ||||
| -rw-r--r-- | include/linux/usb/f_accessory.h | 17 |
2 files changed, 26 insertions, 2 deletions
diff --git a/drivers/usb/gadget/f_accessory.c b/drivers/usb/gadget/f_accessory.c index 04ceb09..07c29d9 100644 --- a/drivers/usb/gadget/f_accessory.c +++ b/drivers/usb/gadget/f_accessory.c @@ -40,7 +40,7 @@ #define BULK_BUFFER_SIZE 16384 #define ACC_STRING_SIZE 256 -#define PROTOCOL_VERSION 1 +#define PROTOCOL_VERSION 2 /* String IDs */ #define INTERFACE_STRING_INDEX 0 @@ -78,6 +78,8 @@ struct acc_dev { /* set to 1 if we have a pending start request */ int start_requested; + int audio_mode; + /* synchronize access to our device file */ atomic_t open_excl; @@ -510,6 +512,8 @@ static long acc_ioctl(struct file *fp, unsigned code, unsigned long value) break; case ACCESSORY_IS_START_REQUESTED: return dev->start_requested; + case ACCESSORY_GET_AUDIO_MODE: + return dev->audio_mode; } if (!src) return -EINVAL; @@ -586,6 +590,10 @@ static int acc_ctrlrequest(struct usb_composite_dev *cdev, cdev->gadget->ep0->driver_data = dev; cdev->req->complete = acc_complete_set_string; value = w_length; + } else if (b_request == ACCESSORY_SET_AUDIO_MODE && + w_index == 0 && w_length == 0) { + dev->audio_mode = w_value; + value = 0; } } else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) { if (b_request == ACCESSORY_GET_PROTOCOL) { @@ -600,6 +608,7 @@ static int acc_ctrlrequest(struct usb_composite_dev *cdev, memset(dev->uri, 0, sizeof(dev->uri)); memset(dev->serial, 0, sizeof(dev->serial)); dev->start_requested = 0; + dev->audio_mode = 0; } } diff --git a/include/linux/usb/f_accessory.h b/include/linux/usb/f_accessory.h index 5b2dcf9..ddb2fd0 100644 --- a/include/linux/usb/f_accessory.h +++ b/include/linux/usb/f_accessory.h @@ -36,13 +36,15 @@ #define ACCESSORY_STRING_URI 4 #define ACCESSORY_STRING_SERIAL 5 -/* Control request for retrieving device's protocol version (currently 1) +/* Control request for retrieving device's protocol version * * requestType: USB_DIR_IN | USB_TYPE_VENDOR * request: ACCESSORY_GET_PROTOCOL * value: 0 * index: 0 * data version number (16 bits little endian) + * 1 for original accessory support + * 2 adds device to host audio support */ #define ACCESSORY_GET_PROTOCOL 51 @@ -70,6 +72,17 @@ */ #define ACCESSORY_START 53 +/* Control request for setting the audio mode. + * + * requestType: USB_DIR_OUT | USB_TYPE_VENDOR + * request: ACCESSORY_SET_AUDIO_MODE + * value: 0 - no audio + * 1 - device to host, 44100 16-bit stereo PCM + * index: 0 + * data none + */ +#define ACCESSORY_SET_AUDIO_MODE 58 + /* ioctls for retrieving strings set by the host */ #define ACCESSORY_GET_STRING_MANUFACTURER _IOW('M', 1, char[256]) #define ACCESSORY_GET_STRING_MODEL _IOW('M', 2, char[256]) @@ -79,5 +92,7 @@ #define ACCESSORY_GET_STRING_SERIAL _IOW('M', 6, char[256]) /* returns 1 if there is a start request pending */ #define ACCESSORY_IS_START_REQUESTED _IO('M', 7) +/* returns audio mode (set via the ACCESSORY_SET_AUDIO_MODE control request) */ +#define ACCESSORY_GET_AUDIO_MODE _IO('M', 8) #endif /* __LINUX_USB_F_ACCESSORY_H */ |