tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * EZ-USB specific functions used by some of the USB to Serial drivers.
3 *
4 * Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 */
10
11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/tty.h>
16#include <linux/module.h>
17#include <linux/usb.h>
18#include <linux/usb/serial.h>
19
20/* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
21#define CPUCS_REG 0x7F92
22
23int ezusb_writememory (struct usb_serial *serial, int address, unsigned char *data, int length, __u8 bRequest)
24{
25 int result;
26 unsigned char *transfer_buffer;
27
28 /* dbg("ezusb_writememory %x, %d", address, length); */
29 if (!serial->dev) {
30 err("%s - no physical device present, failing.", __FUNCTION__);
31 return -ENODEV;
32 }
33
34 transfer_buffer = kmalloc (length, GFP_KERNEL);
35 if (!transfer_buffer) {
36 dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, length);
37 return -ENOMEM;
38 }
39 memcpy (transfer_buffer, data, length);
40 result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), bRequest, 0x40, address, 0, transfer_buffer, length, 3000);
41 kfree (transfer_buffer);
42 return result;
43}
44
45int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit)
46{
47 int response;
48
49 /* dbg("%s - %d", __FUNCTION__, reset_bit); */
50 response = ezusb_writememory (serial, CPUCS_REG, &reset_bit, 1, 0xa0);
51 if (response < 0)
52 dev_err(&serial->dev->dev, "%s- %d failed\n", __FUNCTION__, reset_bit);
53 return response;
54}
55
56
57EXPORT_SYMBOL(ezusb_writememory);
58EXPORT_SYMBOL(ezusb_set_reset);
59