Hello, I've figured out how to get my userspace driver code to enumerate for
the host and send/receive from the device with bulk endpoints as demonstrated
in ffs-test.c. I have successfully added another bulk endpoint, but issues
arise when I try to add an isochronous endpoint.
I've tracked the problem, I think, to the mere presence of the struct
usb_endpoint_descriptor. Is anyone able to elucidate what I might be missing?
The rejected set of descriptors follows. Note I set the usb_endpoint_descriptor
struct to be a bulk endpoint; I expect the extra fields would be ignored.
I can provide the full code if helpful. Superspeed descriptors commented out
as I'm less familiar with USB3 and I found that the fs/hs/ss descriptor sets had
to be equivalent.
```
static const struct {
struct usb_functionfs_descs_head_v2 header;
__le32 fs_count;
__le32 hs_count;
//__le32 ss_count;
struct {
struct usb_interface_descriptor intf;
struct usb_endpoint_descriptor_no_audio sink;
struct usb_endpoint_descriptor_no_audio source;
struct usb_endpoint_descriptor iso_sink;
} __attribute__((packed)) fs_descs, hs_descs;
/*struct {
struct usb_interface_descriptor intf;
struct usb_endpoint_descriptor_no_audio sink;
struct usb_ss_ep_comp_descriptor sink_comp;
struct usb_endpoint_descriptor_no_audio source;
struct usb_ss_ep_comp_descriptor source_comp;
} ss_descs;*/
} __attribute__((packed)) descriptors = {
.header = {
.magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
.length = cpu_to_le32(sizeof descriptors),
.flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC |
FUNCTIONFS_HAS_HS_DESC), // |
//FUNCTIONFS_HAS_SS_DESC),
},
.fs_count = cpu_to_le32(4),
.hs_count = cpu_to_le32(4),
//.ss_count = cpu_to_le32(5),
.fs_descs = {
.intf = {
.bLength = sizeof descriptors.fs_descs.intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.iInterface = 1,
},
.sink = {
.bLength = sizeof descriptors.fs_descs.sink,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
/* .wMaxPacketSize = autoconfiguration (kernel) */
},
.source = {
.bLength = sizeof descriptors.fs_descs.source,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
/* .wMaxPacketSize = autoconfiguration (kernel) */
},
.iso_sink = {
.bLength = sizeof descriptors.fs_descs.iso_sink,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 3 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
},
},
.hs_descs = {
.intf = {
.bLength = sizeof descriptors.fs_descs.intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 3,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.iInterface = 1,
},
.sink = {
.bLength = sizeof descriptors.hs_descs.sink,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
},
.source = {
.bLength = sizeof descriptors.hs_descs.iso_sink,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
.bInterval = 1,
},
.iso_sink = {
.bLength = sizeof descriptors.hs_descs.source,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 3 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(512),
.bInterval = 1,
},
},
/*.ss_descs = {
.intf = {
.bLength = sizeof descriptors.fs_descs.intf,
.bDescriptorType = USB_DT_INTERFACE,
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
.iInterface = 1,
},
.sink = {
.bLength = sizeof descriptors.hs_descs.sink,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 1 | USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(1024),
},
.sink_comp = {
.bLength = USB_DT_SS_EP_COMP_SIZE,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
.wBytesPerInterval = 0,
},
.source = {
.bLength = sizeof descriptors.hs_descs.source,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = 2 | USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
.wMaxPacketSize = cpu_to_le16(1024),
.bInterval = 1,
},
.source_comp = {
.bLength = USB_DT_SS_EP_COMP_SIZE,
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
.bMaxBurst = 0,
.bmAttributes = 0,
.wBytesPerInterval = 0,
},
},*/
};
```
Cheers!
