LXR linux/drivers/usb/serial/ezusb.c

   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,
  24                                unsigned char *data, int length, __u8 request)
  25{
  26        int result;
  27        unsigned char *transfer_buffer;
  28
  29        if (!serial->dev) {
  30                printk(KERN_ERR "ezusb: %s - no physical device present, "
  31                       "failing.\n", __func__);
  32                return -ENODEV;
  33        }
  34
  35        transfer_buffer = kmemdup(data, length, GFP_KERNEL);
  36        if (!transfer_buffer) {
  37                dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n",
  38                                                        __func__, length);
  39                return -ENOMEM;
  40        }
  41        result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
  42                     request, 0x40, address, 0, transfer_buffer, length, 3000);
  43        kfree(transfer_buffer);
  44        return result;
  45}
  46EXPORT_SYMBOL_GPL(ezusb_writememory);
  47
  48int ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit)
  49{
  50        int response;
  51
  52        response = ezusb_writememory(serial, CPUCS_REG, &reset_bit, 1, 0xa0);
  53        if (response < 0)
  54                dev_err(&serial->dev->dev, "%s- %d failed\n",
  55                                                __func__, reset_bit);
  56        return response;
  57}
  58EXPORT_SYMBOL_GPL(ezusb_set_reset);
  59
  60