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, 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 = kmemdup(data, 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        result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), bRequest, 0x40, address, 0, transfer_buffer, length, 3000);
  40        kfree (transfer_buffer);
  41        return result;
  42}
  43
  44int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit)
  45{
  46        int response;
  47
  48        /* dbg("%s - %d", __FUNCTION__, reset_bit); */
  49        response = ezusb_writememory (serial, CPUCS_REG, &reset_bit, 1, 0xa0);
  50        if (response < 0)
  51                dev_err(&serial->dev->dev, "%s- %d failed\n", __FUNCTION__, reset_bit);
  52        return response;
  53}
  54
  55
  56EXPORT_SYMBOL(ezusb_writememory);
  57EXPORT_SYMBOL(ezusb_set_reset);
  58
  59