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