mirror of
https://github.com/torvalds/linux.git
synced 2024-11-14 16:12:02 +00:00
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
|
/*
|
||
|
|
* 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 "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 bRequest)
|
||
|
|
{
|
||
|
|
int result;
|
||
|
|
unsigned char *transfer_buffer;
|
||
|
|
|
||
|
|
/* dbg("ezusb_writememory %x, %d", address, length); */
|
||
|
|
if (!serial->dev) {
|
||
|
|
err("%s - no physical device present, failing.", __FUNCTION__);
|
||
|
|
return -ENODEV;
|
||
|
|
}
|
||
|
|
|
||
|
|
transfer_buffer = kmalloc (length, GFP_KERNEL);
|
||
|
|
if (!transfer_buffer) {
|
||
|
|
dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, length);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
memcpy (transfer_buffer, data, length);
|
||
|
|
result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), bRequest, 0x40, address, 0, transfer_buffer, length, 3000);
|
||
|
|
kfree (transfer_buffer);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ezusb_set_reset (struct usb_serial *serial, unsigned char reset_bit)
|
||
|
|
{
|
||
|
|
int response;
|
||
|
|
|
||
|
|
/* dbg("%s - %d", __FUNCTION__, reset_bit); */
|
||
|
|
response = ezusb_writememory (serial, CPUCS_REG, &reset_bit, 1, 0xa0);
|
||
|
|
if (response < 0)
|
||
|
|
dev_err(&serial->dev->dev, "%s- %d failed\n", __FUNCTION__, reset_bit);
|
||
|
|
return response;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(ezusb_writememory);
|
||
|
|
EXPORT_SYMBOL(ezusb_set_reset);
|
||
|
|
|