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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/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/usb.h>
/* EZ-USB Control and Status Register. Bit 0 controls 8051 reset */
#define CPUCS_REG 0x7F92
/* Command for writing to internal memory */
#define WRITE_INT_RAM 0xA0
int ezusb_writememory(struct usb_device *dev, int address,
unsigned char *data, int length, __u8 request)
{
int result;
unsigned char *transfer_buffer;
if (!dev)
return -ENODEV;
transfer_buffer = kmemdup(data, length, GFP_KERNEL);
if (!transfer_buffer) {
dev_err(&dev->dev, "%s - kmalloc(%d) failed.\n",
__func__, length);
return -ENOMEM;
}
result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
address, 0, transfer_buffer, length, 3000);
kfree(transfer_buffer);
return result;
}
EXPORT_SYMBOL_GPL(ezusb_writememory);
int ezusb_set_reset(struct usb_device *dev, unsigned char reset_bit)
{
int response = ezusb_writememory(dev, CPUCS_REG, &reset_bit, 1, WRITE_INT_RAM);
if (response < 0)
dev_err(&dev->dev, "%s-%d failed: %d\n",
__func__, reset_bit, response);
return response;
}
EXPORT_SYMBOL_GPL(ezusb_set_reset);
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