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/config.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/tty.h>
17#include <linux/module.h>
18#include <linux/usb.h>
19#include "usb-serial.h"
20
21/* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
22#define CPUCS_REG 0x7F92
23
24int ezusb_writememory (struct usb_serial *serial, int address, unsigned char *data, int length, __u8 bRequest)
25{
26 int result;
27 unsigned char *transfer_buffer;
28
29 /* dbg("ezusb_writememory %x, %d", address, length); */
30 if (!serial->dev) {
31 err("%s - no physical device present, failing.", __FUNCTION__);
32 return -ENODEV;
33 }
34
35 transfer_buffer = kmalloc (length, GFP_KERNEL);
36 if (!transfer_buffer) {
37 dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, length);
38 return -ENOMEM;
39 }
40 memcpy (transfer_buffer, data, length);
41 result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), bRequest, 0x40, address, 0, transfer_buffer, length, 3000);
42 kfree (transfer_buffer);
43 return result;
44}
45
46int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit)
47{
48 int response;
49
50 /* dbg("%s - %d", __FUNCTION__, reset_bit); */
51 response = ezusb_writememory (serial, CPUCS_REG, &reset_bit, 1, 0xa0);
52 if (response < 0)
53 dev_err(&serial->dev->dev, "%s- %d failed\n", __FUNCTION__, reset_bit);
54 return response;
55}
56
57
58EXPORT_SYMBOL(ezusb_writememory);
59EXPORT_SYMBOL(ezusb_set_reset);
60