From: David Sands <david.sands@xxxxxxxxx> Add the ability for FunctionFS driver to be able to create DFU Run-Time descriptors. Signed-off-by: David Sands <david.sands@xxxxxxxxx> Co-developed-by: Chris Wulff <chris.wulff@xxxxxxxxx> Signed-off-by: Chris Wulff <chris.wulff@xxxxxxxxx> --- v3: Documentation, additional constants and constant order fixed v2: https://lore.kernel.org/linux-usb/CO1PR17MB54198D086B61F7392FA9075FE10E2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ v1: https://lore.kernel.org/linux-usb/CO1PR17MB5419AC3907C74E28D80C5021E1082@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ drivers/usb/gadget/function/f_fs.c | 12 ++++++++++-- include/uapi/linux/usb/ch9.h | 9 +++++++-- include/uapi/linux/usb/functionfs.h | 25 +++++++++++++++++++++++++ 3 files changed, 42 insertions(+), 4 deletions(-) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index bffbc1dc651f..4cc3f3601cf0 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -2467,7 +2467,7 @@ typedef int (*ffs_os_desc_callback)(enum ffs_os_desc_type entity, static int __must_check ffs_do_single_desc(char *data, unsigned len, ffs_entity_callback entity, - void *priv, int *current_class) + void *priv, int *current_class, int *current_subclass) { struct usb_descriptor_header *_ds = (void *)data; u8 length; @@ -2524,6 +2524,7 @@ static int __must_check ffs_do_single_desc(char *data, unsigned len, if (ds->iInterface) __entity(STRING, ds->iInterface); *current_class = ds->bInterfaceClass; + *current_subclass = ds->bInterfaceSubClass; } break; @@ -2548,6 +2549,12 @@ static int __must_check ffs_do_single_desc(char *data, unsigned len, if (length != sizeof(struct ccid_descriptor)) goto inv_length; break; + } else if (*current_class == USB_CLASS_APP_SPEC && + *current_subclass == USB_SUBCLASS_DFU) { + pr_vdebug("dfu functional descriptor\n"); + if (length != sizeof(struct usb_dfu_functional_descriptor)) + goto inv_length; + break; } else { pr_vdebug("unknown descriptor: %d for class %d\n", _ds->bDescriptorType, *current_class); @@ -2610,6 +2617,7 @@ static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, const unsigned _len = len; unsigned long num = 0; int current_class = -1; + int current_subclass = -1; for (;;) { int ret; @@ -2629,7 +2637,7 @@ static int __must_check ffs_do_descs(unsigned count, char *data, unsigned len, return _len - len; ret = ffs_do_single_desc(data, len, entity, priv, - ¤t_class); + ¤t_class, ¤t_subclass); if (ret < 0) { pr_debug("%s returns %d\n", __func__, ret); return ret; diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h index 44d73ba8788d..7f155fba0c1f 100644 --- a/include/uapi/linux/usb/ch9.h +++ b/include/uapi/linux/usb/ch9.h @@ -254,6 +254,9 @@ struct usb_ctrlrequest { #define USB_DT_DEVICE_CAPABILITY 0x10 #define USB_DT_WIRELESS_ENDPOINT_COMP 0x11 #define USB_DT_WIRE_ADAPTER 0x21 +/* From USB Device Firmware Upgrade Specification, Revision 1.1 */ +#define USB_DT_DFU_FUNCTIONAL 0x21 +/* these are from the Wireless USB spec */ #define USB_DT_RPIPE 0x22 #define USB_DT_CS_RADIO_CONTROL 0x23 /* From the T10 UAS specification */ @@ -263,6 +266,7 @@ struct usb_ctrlrequest { /* From the USB 3.1 spec */ #define USB_DT_SSP_ISOC_ENDPOINT_COMP 0x31 + /* Conventional codes for class-specific descriptors. The convention is * defined in the USB "Common Class" Spec (3.11). Individual class specs * are authoritative for their usage, not the "common class" writeup. @@ -329,9 +333,10 @@ struct usb_device_descriptor { #define USB_CLASS_USB_TYPE_C_BRIDGE 0x12 #define USB_CLASS_MISC 0xef #define USB_CLASS_APP_SPEC 0xfe -#define USB_CLASS_VENDOR_SPEC 0xff +#define USB_SUBCLASS_DFU 0x01 -#define USB_SUBCLASS_VENDOR_SPEC 0xff +#define USB_CLASS_VENDOR_SPEC 0xff +#define USB_SUBCLASS_VENDOR_SPEC 0xff /*-------------------------------------------------------------------------*/ diff --git a/include/uapi/linux/usb/functionfs.h b/include/uapi/linux/usb/functionfs.h index 9f88de9c3d66..6d2061500184 100644 --- a/include/uapi/linux/usb/functionfs.h +++ b/include/uapi/linux/usb/functionfs.h @@ -37,6 +37,31 @@ struct usb_endpoint_descriptor_no_audio { __u8 bInterval; } __attribute__((packed)); +/** + * struct usb_dfu_functional_descriptor - DFU Functional descriptor + * @bLength: Size of the descriptor (bytes) + * @bDescriptorType: USB_DT_DFU_FUNCTIONAL + * @bmAttributes: DFU attributes + * @wDetachTimeOut: Maximum time to wait after DFU_DETACH (ms, le16) + * @wTransferSize: Maximum number of bytes per control-write (le16) + * @bcdDFUVersion: DFU Spec version (BCD, le16) + */ +struct usb_dfu_functional_descriptor { + __u8 bLength; + __u8 bDescriptorType; + __u8 bmAttributes; + __le16 wDetachTimeOut; + __le16 wTransferSize; + __le16 bcdDFUVersion; +} __attribute__ ((packed)); + +/* from DFU functional descriptor bmAttributes */ +#define DFU_FUNC_ATT_WILL_DETACH (1 << 3) +#define DFU_FUNC_ATT_MANIFEST_TOLERANT (1 << 2) +#define DFU_FUNC_ATT_CAN_UPLOAD (1 << 1) +#define DFU_FUNC_ATT_CAN_DOWNLOAD (1 << 0) + + struct usb_functionfs_descs_head_v2 { __le32 magic; __le32 length; -- 2.34.1
