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/*
* EZ-USB specific functions used by some of the USB to Serial drivers.
*
* Copyright (C) 1999 - 2002 Greg Kroah-Hartman (greg@kroah.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/usb/serial.h>
/* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
#define CPUCS_REG 0x7F92
int ezusb_writememory(struct usb_serial *serial, int address,
unsigned char *data, int length, __u8 request)
{
int result;
unsigned char *transfer_buffer;
/* dbg("ezusb_writememory %x, %d", address, length); */
if (!serial->dev) {
printk(KERN_ERR "ezusb: %s - no physical device present, "
"failing.\n", __func__);
return -ENODEV;
}
transfer_buffer = kmemdup(data, length, GFP_KERNEL);
if (!transfer_buffer) {
dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n",
__func__, length);
return -ENOMEM;
}
result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
request, 0x40, address, 0, transfer_buffer, length, 3000);
kfree(transfer_buffer);
return result;
}
EXPORT_SYMBOL_GPL(ezusb_writememory);
int ezusb_set_reset(struct usb_serial *serial, unsigned char reset_bit)
{
int response;
/* dbg("%s - %d", __func__, reset_bit); */
response = ezusb_writememory(serial, CPUCS_REG, &reset_bit, 1, 0xa0);
if (response < 0)
dev_err(&serial->dev->dev, "%s- %d failed\n",
__func__, reset_bit);
return response;
}
EXPORT_SYMBOL_GPL(ezusb_set_reset);
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