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