usb: kbd: Allow "usb reset" to continue when an usb kbd is used

Use the new force parameter to make the stdio_deregister succeed, replacing
stdin with a nulldev, and assume that the usb keyboard will come back after
the reset.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

common/cmd_usb.c

@@ -430,10 +430,10 @@ static int do_usbboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 }
 #endif /* CONFIG_USB_STORAGE */
 
-static int do_usb_stop_keyboard(void)
+static int do_usb_stop_keyboard(int force)
 {
 #ifdef CONFIG_USB_KEYBOARD
-	if (usb_kbd_deregister() != 0) {
+	if (usb_kbd_deregister(force) != 0) {
 		printf("USB not stopped: usbkbd still using USB\n");
 		return 1;
 	}
@@ -460,7 +460,7 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if ((strncmp(argv[1], "reset", 5) == 0) ||
 		 (strncmp(argv[1], "start", 5) == 0)) {
 		bootstage_mark_name(BOOTSTAGE_ID_USB_START, "usb_start");
-		if (do_usb_stop_keyboard() != 0)
+		if (do_usb_stop_keyboard(1) != 0)
 			return 1;
 		usb_stop();
 		printf("(Re)start USB...\n");
@@ -482,7 +482,7 @@ static int do_usb(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	if (strncmp(argv[1], "stop", 4) == 0) {
 		if (argc != 2)
 			console_assign(stdin, "serial");
-		if (do_usb_stop_keyboard() != 0)
+		if (do_usb_stop_keyboard(0) != 0)
 			return 1;
 		printf("stopping USB..\n");
 		usb_stop();

common/usb_kbd.c

@@ -547,10 +547,10 @@ int drv_usb_kbd_init(void)
 }
 
 /* Deregister the keyboard. */
-int usb_kbd_deregister(void)
+int usb_kbd_deregister(int force)
 {
 #ifdef CONFIG_SYS_STDIO_DEREGISTER
-	int ret = stdio_deregister(DEVNAME, 0);
+	int ret = stdio_deregister(DEVNAME, force);
 	if (ret && ret != -ENODEV)
 		return ret;
 

include/usb.h

@@ -216,7 +216,7 @@ int usb_host_eth_scan(int mode);
 #ifdef CONFIG_USB_KEYBOARD
 
 int drv_usb_kbd_init(void);
-int usb_kbd_deregister(void);
+int usb_kbd_deregister(int force);
 
 #endif
 /* routines */