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// SPDX-License-Identifier: GPL-2.0
/*
* Common USB debugging functions
*
* Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com
*
* Authors: Felipe Balbi <balbi@ti.com>,
* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
*/
#include <linux/usb/ch9.h>
static void usb_decode_get_status(__u8 bRequestType, __u16 wIndex,
__u16 wLength, char *str, size_t size)
{
switch (bRequestType & USB_RECIP_MASK) {
case USB_RECIP_DEVICE:
snprintf(str, size, "Get Device Status(Length = %d)", wLength);
break;
case USB_RECIP_INTERFACE:
snprintf(str, size,
"Get Interface Status(Intf = %d, Length = %d)",
wIndex, wLength);
break;
case USB_RECIP_ENDPOINT:
snprintf(str, size, "Get Endpoint Status(ep%d%s)",
wIndex & ~USB_DIR_IN,
wIndex & USB_DIR_IN ? "in" : "out");
break;
}
}
static const char *usb_decode_device_feature(u16 wValue)
{
switch (wValue) {
case USB_DEVICE_SELF_POWERED:
return "Self Powered";
case USB_DEVICE_REMOTE_WAKEUP:
return "Remote Wakeup";
case USB_DEVICE_TEST_MODE:
return "Test Mode";
case USB_DEVICE_U1_ENABLE:
return "U1 Enable";
case USB_DEVICE_U2_ENABLE:
return "U2 Enable";
case USB_DEVICE_LTM_ENABLE:
return "LTM Enable";
default:
return "UNKNOWN";
}
}
static const char *usb_decode_test_mode(u16 wIndex)
{
switch (wIndex) {
case USB_TEST_J:
return ": TEST_J";
case USB_TEST_K:
return ": TEST_K";
case USB_TEST_SE0_NAK:
return ": TEST_SE0_NAK";
case USB_TEST_PACKET:
return ": TEST_PACKET";
case USB_TEST_FORCE_ENABLE:
return ": TEST_FORCE_EN";
default:
return ": UNKNOWN";
}
}
static void usb_decode_set_clear_feature(__u8 bRequestType,
__u8 bRequest, __u16 wValue,
__u16 wIndex, char *str, size_t size)
{
switch (bRequestType & USB_RECIP_MASK) {
case USB_RECIP_DEVICE:
snprintf(str, size, "%s Device Feature(%s%s)",
bRequest == USB_REQ_CLEAR_FEATURE ? "Clear" : "Set",
usb_decode_device_feature(wValue),
wValue == USB_DEVICE_TEST_MODE ?
usb_decode_test_mode(wIndex) : "");
break;
case USB_RECIP_INTERFACE:
snprintf(str, size, "%s Interface Feature(%s)",
bRequest == USB_REQ_CLEAR_FEATURE ? "Clear" : "Set",
wValue == USB_INTRF_FUNC_SUSPEND ?
"Function Suspend" : "UNKNOWN");
break;
case USB_RECIP_ENDPOINT:
snprintf(str, size, "%s Endpoint Feature(%s ep%d%s)",
bRequest == USB_REQ_CLEAR_FEATURE ? "Clear" : "Set",
wValue == USB_ENDPOINT_HALT ? "Halt" : "UNKNOWN",
wIndex & ~USB_DIR_IN,
wIndex & USB_DIR_IN ? "in" : "out");
break;
}
}
static void usb_decode_set_address(__u16 wValue, char *str, size_t size)
{
snprintf(str, size, "Set Address(Addr = %02x)", wValue);
}
static void usb_decode_get_set_descriptor(__u8 bRequestType, __u8 bRequest,
__u16 wValue, __u16 wIndex,
__u16 wLength, char *str, size_t size)
{
char *s;
switch (wValue >> 8) {
case USB_DT_DEVICE:
s = "Device";
break;
case USB_DT_CONFIG:
s = "Configuration";
break;
case USB_DT_STRING:
s = "String";
break;
case USB_DT_INTERFACE:
s = "Interface";
break;
case USB_DT_ENDPOINT:
s = "Endpoint";
break;
case USB_DT_DEVICE_QUALIFIER:
s = "Device Qualifier";
break;
case USB_DT_OTHER_SPEED_CONFIG:
s = "Other Speed Config";
break;
case USB_DT_INTERFACE_POWER:
s = "Interface Power";
break;
case USB_DT_OTG:
s = "OTG";
break;
case USB_DT_DEBUG:
s = "Debug";
break;
case USB_DT_INTERFACE_ASSOCIATION:
s = "Interface Association";
break;
case USB_DT_BOS:
s = "BOS";
break;
case USB_DT_DEVICE_CAPABILITY:
s = "Device Capability";
break;
case USB_DT_PIPE_USAGE:
s = "Pipe Usage";
break;
case USB_DT_SS_ENDPOINT_COMP:
s = "SS Endpoint Companion";
break;
case USB_DT_SSP_ISOC_ENDPOINT_COMP:
s = "SSP Isochronous Endpoint Companion";
break;
default:
s = "UNKNOWN";
break;
}
snprintf(str, size, "%s %s Descriptor(Index = %d, Length = %d)",
bRequest == USB_REQ_GET_DESCRIPTOR ? "Get" : "Set",
s, wValue & 0xff, wLength);
}
static void usb_decode_get_configuration(__u16 wLength, char *str, size_t size)
{
snprintf(str, size, "Get Configuration(Length = %d)", wLength);
}
static void usb_decode_set_configuration(__u8 wValue, char *str, size_t size)
{
snprintf(str, size, "Set Configuration(Config = %d)", wValue);
}
static void usb_decode_get_intf(__u16 wIndex, __u16 wLength, char *str,
size_t size)
{
snprintf(str, size, "Get Interface(Intf = %d, Length = %d)",
wIndex, wLength);
}
static void usb_decode_set_intf(__u8 wValue, __u16 wIndex, char *str,
size_t size)
{
snprintf(str, size, "Set Interface(Intf = %d, Alt.Setting = %d)",
wIndex, wValue);
}
static void usb_decode_synch_frame(__u16 wIndex, __u16 wLength,
char *str, size_t size)
{
snprintf(str, size, "Synch Frame(Endpoint = %d, Length = %d)",
wIndex, wLength);
}
static void usb_decode_set_sel(__u16 wLength, char *str, size_t size)
{
snprintf(str, size, "Set SEL(Length = %d)", wLength);
}
static void usb_decode_set_isoch_delay(__u8 wValue, char *str, size_t size)
{
snprintf(str, size, "Set Isochronous Delay(Delay = %d ns)", wValue);
}
/*
* usb_decode_ctrl - returns a string representation of ctrl request
*/
const char *usb_decode_ctrl(char *str, size_t size, __u8 bRequestType,
__u8 bRequest, __u16 wValue, __u16 wIndex,
__u16 wLength)
{
switch (bRequest) {
case USB_REQ_GET_STATUS:
usb_decode_get_status(bRequestType, wIndex, wLength, str, size);
break;
case USB_REQ_CLEAR_FEATURE:
case USB_REQ_SET_FEATURE:
usb_decode_set_clear_feature(bRequestType, bRequest, wValue,
wIndex, str, size);
break;
case USB_REQ_SET_ADDRESS:
usb_decode_set_address(wValue, str, size);
break;
case USB_REQ_GET_DESCRIPTOR:
case USB_REQ_SET_DESCRIPTOR:
usb_decode_get_set_descriptor(bRequestType, bRequest, wValue,
wIndex, wLength, str, size);
break;
case USB_REQ_GET_CONFIGURATION:
usb_decode_get_configuration(wLength, str, size);
break;
case USB_REQ_SET_CONFIGURATION:
usb_decode_set_configuration(wValue, str, size);
break;
case USB_REQ_GET_INTERFACE:
usb_decode_get_intf(wIndex, wLength, str, size);
break;
case USB_REQ_SET_INTERFACE:
usb_decode_set_intf(wValue, wIndex, str, size);
break;
case USB_REQ_SYNCH_FRAME:
usb_decode_synch_frame(wIndex, wLength, str, size);
break;
case USB_REQ_SET_SEL:
usb_decode_set_sel(wLength, str, size);
break;
case USB_REQ_SET_ISOCH_DELAY:
usb_decode_set_isoch_delay(wValue, str, size);
break;
default:
snprintf(str, size, "%02x %02x %02x %02x %02x %02x %02x %02x",
bRequestType, bRequest,
(u8)(cpu_to_le16(wValue) & 0xff),
(u8)(cpu_to_le16(wValue) >> 8),
(u8)(cpu_to_le16(wIndex) & 0xff),
(u8)(cpu_to_le16(wIndex) >> 8),
(u8)(cpu_to_le16(wLength) & 0xff),
(u8)(cpu_to_le16(wLength) >> 8));
}
return str;
}
EXPORT_SYMBOL_GPL(usb_decode_ctrl);
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