接上文，配置编译gadget HID模块
make modules后在driver/usb/gadget目录下生成g_hid.ko
执行加载命令：
root@XXX:/mnt# insmod g_hid.ko insmod: can't insert 'g_hid.ko': No such device
提示错误。
在TI 技术论坛上看到相关技术回复：
-
The error message you had before 'error inserting 'g_hid.ko': -1 No such device.' is due to incomplete hid gadget driver. You can followDocumentation/usb/gadget_hid.txt
to add your own platform device portion.For your reference, the following patch is what I tried and it works with the 3.3 kernel from the link I provided above with SD card boot.
下载提及的补丁
From 6363b29be2c2b477a723b74e52025511be280979 Mon Sep 17 00:00:00 2001
From: Bin Liu <b-liu@ti.com>
Date: Fri, 18 Jan 2013 10:27:57 -0600
Subject: [PATCH] patched hid gadget
---
drivers/usb/gadget/hid.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/gadget/hid.c b/drivers/usb/gadget/hid.c
index f888c3e..c037039 100644
--- a/drivers/usb/gadget/hid.c
+++ b/drivers/usb/gadget/hid.c
@@ -16,6 +16,8 @@
#include <linux/platform_device.h>
#include <linux/list.h>
+#include <linux/usb/g_hid.h>
+
#define DRIVER_DESC "HID Gadget"
#define DRIVER_VERSION "2010/03/16"
@@ -49,6 +51,57 @@ struct hidg_func_node {
static LIST_HEAD(hidg_func_list);
+
+/* hid descriptor for a keyboard */
+static struct hidg_func_descriptor my_hid_data = {
+ .subclass = 0, /* No subclass */
+ .protocol = 1, /* Keyboard */
+ .report_length = 8,
+ .report_desc_length = 63,
+ .report_desc = {
+ 0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
+ 0x09, 0x06, /* USAGE (Keyboard) */
+ 0xa1, 0x01, /* COLLECTION (Application) */
+ 0x05, 0x07, /* USAGE_PAGE (Keyboard) */
+ 0x19, 0xe0, /* USAGE_MINIMUM (Keyboard LeftControl) */
+ 0x29, 0xe7, /* USAGE_MAXIMUM (Keyboard Right GUI) */
+ 0x15, 0x00, /* LOGICAL_MINIMUM (0) */
+ 0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
+ 0x75, 0x01, /* REPORT_SIZE (1) */
+ 0x95, 0x08, /* REPORT_COUNT (8) */
+ 0x81, 0x02, /* INPUT (Data,Var,Abs) */
+ 0x95, 0x01, /* REPORT_COUNT (1) */
+ 0x75, 0x08, /* REPORT_SIZE (8) */
+ 0x81, 0x03, /* INPUT (Cnst,Var,Abs) */
+ 0x95, 0x05, /* REPORT_COUNT (5) */
+ 0x75, 0x01, /* REPORT_SIZE (1) */
+ 0x05, 0x08, /* USAGE_PAGE (LEDs) */
+ 0x19, 0x01, /* USAGE_MINIMUM (Num Lock) */
+ 0x29, 0x05, /* USAGE_MAXIMUM (Kana) */
+ 0x91, 0x02, /* OUTPUT (Data,Var,Abs) */
+ 0x95, 0x01, /* REPORT_COUNT (1) */
+ 0x75, 0x03, /* REPORT_SIZE (3) */
+ 0x91, 0x03, /* OUTPUT (Cnst,Var,Abs) */
+ 0x95, 0x06, /* REPORT_COUNT (6) */
+ 0x75, 0x08, /* REPORT_SIZE (8) */
+ 0x15, 0x00, /* LOGICAL_MINIMUM (0) */
+ 0x25, 0x65, /* LOGICAL_MAXIMUM (101) */
+ 0x05, 0x07, /* USAGE_PAGE (Keyboard) */
+ 0x19, 0x00, /* USAGE_MINIMUM (Reserved) */
+ 0x29, 0x65, /* USAGE_MAXIMUM (Keyboard Application) */
+ 0x81, 0x00, /* INPUT (Data,Ary,Abs) */
+ 0xc0 /* END_COLLECTION */
+ }
+};
+
+static struct platform_device my_hid = {
+ .name = "hidg",
+ .id = 0,
+ .num_resources = 0,
+ .resource = 0,
+ .dev.platform_data = &my_hid_data,
+};
+
/*-------------------------------------------------------------------------*/
static struct usb_device_descriptor device_desc = {
@@ -267,6 +320,13 @@ static int __init hidg_init(void)
{
int status;
+ status = platform_device_register(&my_hid);
+ if (status < 0) {
+ printk("____ reg failed\n");
+ platform_device_unregister(&my_hid);
+ return status;
+ }
+
status = platform_driver_probe(&hidg_plat_driver,
hidg_plat_driver_probe);
if (status < 0)
@@ -283,6 +343,7 @@ module_init(hidg_init);
static void __exit hidg_cleanup(void)
{
platform_driver_unregister(&hidg_plat_driver);
+ platform_device_unregister(&my_hid);
usb_composite_unregister(&hidg_driver);
}
module_exit(hidg_cleanup);
--
1.7.0.4
继续尝试。。。