commit 2d148ea63fe50bf30071cb3e6c87fbd32c081cba
Author: Vladimir Serbinenko <phcoder@xxxxxxxxx>
Date: Tue May 26 21:35:06 2015 +0200
dbgp: Supply config descriptor and accept set config command.
This descriptor and commands are part of core USB specification and
every
USB device should have one.
When g_dbgp is used in early printk or in coreboot through EHCI
debug those
descriptors are never read and hence this doesn't create a problem.
However for
coreboot payloads with full USB stack or Linux once booted those
descriptors
are essential, so without them both GRUB-as-payload and Linux refuse to
recognize it.
Tested and works as expected in coreboot and GRUB. Booted Linux
recognizes
and it works the same way as Net20DC if I change USBID.
early_printk=dbgp
is not tested for lack of kernel with this feature enabled under my
hand.
Signed-off-by: Vladimir Serbinenko <phcoder@xxxxxxxxx>
diff --git a/drivers/usb/gadget/legacy/dbgp.c
b/drivers/usb/gadget/legacy/dbgp.c
index 204b10b..256876ddd 100644
--- a/drivers/usb/gadget/legacy/dbgp.c
+++ b/drivers/usb/gadget/legacy/dbgp.c
@@ -18,7 +18,7 @@
#define DRIVER_VENDOR_ID 0x0525 /* NetChip */
#define DRIVER_PRODUCT_ID 0xc0de /* undefined */
-#define USB_DEBUG_MAX_PACKET_SIZE 8
+#define USB_DEBUG_MAX_PACKET_SIZE 512
#define DBGP_REQ_EP0_LEN 128
#define DBGP_REQ_LEN 512
@@ -61,6 +61,35 @@ static struct usb_endpoint_descriptor o_desc = {
.bEndpointAddress = USB_DIR_OUT,
};
+struct full_config_desc {
+ struct usb_config_descriptor config_desc;
+ struct usb_interface_descriptor iface_desc;
+ u8 ep[2 * USB_DT_ENDPOINT_SIZE];
+};
+
+static struct usb_config_descriptor config_desc = {
+ .bLength = sizeof (struct usb_config_descriptor),
+ .bDescriptorType = USB_DT_CONFIG,
+ .wTotalLength = __constant_cpu_to_le16(sizeof (struct full_config_desc)),
+ .bNumInterfaces = 1,
+ .bConfigurationValue = 1,
+ .iConfiguration = 0,
+ .bmAttributes = 0xc0,
+ .bMaxPower = 0,
+};
+
+static struct usb_interface_descriptor iface_desc = {
+ .bLength = sizeof (struct usb_interface_descriptor),
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = 0xff,
+ .bInterfaceSubClass = 0,
+ .bInterfaceProtocol = 0,
+ .iInterface = 0,
+};
+
#ifdef CONFIG_USB_G_DBGP_PRINTK
static int dbgp_consume(char *buf, unsigned len)
{
@@ -355,6 +384,7 @@ static int dbgp_setup(struct usb_gadget *gadget,
int err = -EOPNOTSUPP;
void *data = NULL;
u16 len = 0;
+ struct full_config_desc full_cfg_desc;
gadget->ep0->driver_data = gadget;
@@ -371,13 +401,26 @@ static int dbgp_setup(struct usb_gadget *gadget,
len = sizeof dbg_desc;
data = &dbg_desc;
break;
+ case USB_DT_CONFIG:
+ dev_dbg(&dbgp.gadget->dev, "setup: desc config\n");
+ full_cfg_desc.config_desc = config_desc;
+ full_cfg_desc.iface_desc = iface_desc;
+ memcpy(full_cfg_desc.ep, &i_desc, USB_DT_ENDPOINT_SIZE);
+ memcpy(full_cfg_desc.ep + USB_DT_ENDPOINT_SIZE, &o_desc,
USB_DT_ENDPOINT_SIZE);
+ data = &full_cfg_desc;
+ len = sizeof full_cfg_desc;
+ break;
default:
goto fail;
}
err = 0;
- } else if (request == USB_REQ_SET_FEATURE &&
- value == USB_DEVICE_DEBUG_MODE) {
- dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
+ } else if ((request == USB_REQ_SET_FEATURE &&
+ value == USB_DEVICE_DEBUG_MODE)
+ || (request == USB_REQ_SET_CONFIGURATION && value == 1)) {
+ if (request == USB_REQ_SET_FEATURE)
+ dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
+ else
+ dev_dbg(&dbgp.gadget->dev, "setup: config 1\n");
#ifdef CONFIG_USB_G_DBGP_PRINTK
err = dbgp_enable_ep();
#else
commit 2d148ea63fe50bf30071cb3e6c87fbd32c081cba
Author: Vladimir Serbinenko <phcoder@gmail.com>
Date: Tue May 26 21:35:06 2015 +0200
dbgp: Supply config descriptor and accept set config command.
This descriptor and commands are part of core USB specification and every
USB device should have one.
When g_dbgp is used in early printk or in coreboot through EHCI debug those
descriptors are never read and hence this doesn't create a problem. However for
coreboot payloads with full USB stack or Linux once booted those descriptors
are essential, so without them both GRUB-as-payload and Linux refuse to
recognize it.
Tested and works as expected in coreboot and GRUB. Booted Linux recognizes
and it works the same way as Net20DC if I change USBID. early_printk=dbgp
is not tested for lack of kernel with this feature enabled under my hand.
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
diff --git a/drivers/usb/gadget/legacy/dbgp.c b/drivers/usb/gadget/legacy/dbgp.c
index 204b10b..256876ddd 100644
--- a/drivers/usb/gadget/legacy/dbgp.c
+++ b/drivers/usb/gadget/legacy/dbgp.c
@@ -18,7 +18,7 @@
#define DRIVER_VENDOR_ID 0x0525 /* NetChip */
#define DRIVER_PRODUCT_ID 0xc0de /* undefined */
-#define USB_DEBUG_MAX_PACKET_SIZE 8
+#define USB_DEBUG_MAX_PACKET_SIZE 512
#define DBGP_REQ_EP0_LEN 128
#define DBGP_REQ_LEN 512
@@ -61,6 +61,35 @@ static struct usb_endpoint_descriptor o_desc = {
.bEndpointAddress = USB_DIR_OUT,
};
+struct full_config_desc {
+ struct usb_config_descriptor config_desc;
+ struct usb_interface_descriptor iface_desc;
+ u8 ep[2 * USB_DT_ENDPOINT_SIZE];
+};
+
+static struct usb_config_descriptor config_desc = {
+ .bLength = sizeof (struct usb_config_descriptor),
+ .bDescriptorType = USB_DT_CONFIG,
+ .wTotalLength = __constant_cpu_to_le16(sizeof (struct full_config_desc)),
+ .bNumInterfaces = 1,
+ .bConfigurationValue = 1,
+ .iConfiguration = 0,
+ .bmAttributes = 0xc0,
+ .bMaxPower = 0,
+};
+
+static struct usb_interface_descriptor iface_desc = {
+ .bLength = sizeof (struct usb_interface_descriptor),
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = 0xff,
+ .bInterfaceSubClass = 0,
+ .bInterfaceProtocol = 0,
+ .iInterface = 0,
+};
+
#ifdef CONFIG_USB_G_DBGP_PRINTK
static int dbgp_consume(char *buf, unsigned len)
{
@@ -355,6 +384,7 @@ static int dbgp_setup(struct usb_gadget *gadget,
int err = -EOPNOTSUPP;
void *data = NULL;
u16 len = 0;
+ struct full_config_desc full_cfg_desc;
gadget->ep0->driver_data = gadget;
@@ -371,13 +401,26 @@ static int dbgp_setup(struct usb_gadget *gadget,
len = sizeof dbg_desc;
data = &dbg_desc;
break;
+ case USB_DT_CONFIG:
+ dev_dbg(&dbgp.gadget->dev, "setup: desc config\n");
+ full_cfg_desc.config_desc = config_desc;
+ full_cfg_desc.iface_desc = iface_desc;
+ memcpy(full_cfg_desc.ep, &i_desc, USB_DT_ENDPOINT_SIZE);
+ memcpy(full_cfg_desc.ep + USB_DT_ENDPOINT_SIZE, &o_desc, USB_DT_ENDPOINT_SIZE);
+ data = &full_cfg_desc;
+ len = sizeof full_cfg_desc;
+ break;
default:
goto fail;
}
err = 0;
- } else if (request == USB_REQ_SET_FEATURE &&
- value == USB_DEVICE_DEBUG_MODE) {
- dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
+ } else if ((request == USB_REQ_SET_FEATURE &&
+ value == USB_DEVICE_DEBUG_MODE)
+ || (request == USB_REQ_SET_CONFIGURATION && value == 1)) {
+ if (request == USB_REQ_SET_FEATURE)
+ dev_dbg(&dbgp.gadget->dev, "setup: feat debug\n");
+ else
+ dev_dbg(&dbgp.gadget->dev, "setup: config 1\n");
#ifdef CONFIG_USB_G_DBGP_PRINTK
err = dbgp_enable_ep();
#else
Attachment:
signature.asc
Description: OpenPGP digital signature
