mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 00:06:51 +07:00
5620b5f7f1
This patch (as1443) fixes a bug found in many of the USB serial drivers: They don't set the .usb_driver field in their usb_serial_driver structure. This field is needed for assigning dynamic IDs for device matching. In addition, starting with the 2.6.37 kernel, the .usb_driver field is needed for proper autosuspend operation. Without it, attempts to open the device file will fail. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-by: Dan Williams <dcbw@redhat.com> CC: <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
/*
|
|
* USB Debug cable driver
|
|
*
|
|
* Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/module.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
|
|
#define USB_DEBUG_MAX_PACKET_SIZE 8
|
|
#define USB_DEBUG_BRK_SIZE 8
|
|
static char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
|
|
0x00,
|
|
0xff,
|
|
0x01,
|
|
0xfe,
|
|
0x00,
|
|
0xfe,
|
|
0x01,
|
|
0xff,
|
|
};
|
|
|
|
static const struct usb_device_id id_table[] = {
|
|
{ USB_DEVICE(0x0525, 0x127a) },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, id_table);
|
|
|
|
static struct usb_driver debug_driver = {
|
|
.name = "debug",
|
|
.probe = usb_serial_probe,
|
|
.disconnect = usb_serial_disconnect,
|
|
.id_table = id_table,
|
|
.no_dynamic_id = 1,
|
|
};
|
|
|
|
/* This HW really does not support a serial break, so one will be
|
|
* emulated when ever the break state is set to true.
|
|
*/
|
|
static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
|
|
{
|
|
struct usb_serial_port *port = tty->driver_data;
|
|
if (!break_state)
|
|
return;
|
|
usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
|
|
}
|
|
|
|
static void usb_debug_read_bulk_callback(struct urb *urb)
|
|
{
|
|
struct usb_serial_port *port = urb->context;
|
|
|
|
if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
|
|
memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
|
|
USB_DEBUG_BRK_SIZE) == 0) {
|
|
usb_serial_handle_break(port);
|
|
usb_serial_generic_submit_read_urb(port, GFP_ATOMIC);
|
|
return;
|
|
}
|
|
|
|
usb_serial_generic_read_bulk_callback(urb);
|
|
}
|
|
|
|
static struct usb_serial_driver debug_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "debug",
|
|
},
|
|
.id_table = id_table,
|
|
.usb_driver = &debug_driver,
|
|
.num_ports = 1,
|
|
.bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE,
|
|
.break_ctl = usb_debug_break_ctl,
|
|
.read_bulk_callback = usb_debug_read_bulk_callback,
|
|
};
|
|
|
|
static int __init debug_init(void)
|
|
{
|
|
int retval;
|
|
|
|
retval = usb_serial_register(&debug_device);
|
|
if (retval)
|
|
return retval;
|
|
retval = usb_register(&debug_driver);
|
|
if (retval)
|
|
usb_serial_deregister(&debug_device);
|
|
return retval;
|
|
}
|
|
|
|
static void __exit debug_exit(void)
|
|
{
|
|
usb_deregister(&debug_driver);
|
|
usb_serial_deregister(&debug_device);
|
|
}
|
|
|
|
module_init(debug_init);
|
|
module_exit(debug_exit);
|
|
MODULE_LICENSE("GPL");
|