7bd4b20c87
When building an external module, the ezusb_* functions are not defined if we haven't loaded any built'in module that use them (whiteheat, keyspan, ...). This patch allow to build those functions even if we only have selected the usbserial generic driver. Signed-off-by: Paul Chavent <paul.chavent@fnac.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
58 lines
1.7 KiB
C
58 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, unsigned char *data, int length, __u8 bRequest)
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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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err("%s - no physical device present, failing.", __FUNCTION__);
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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", __FUNCTION__, 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), bRequest, 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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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", __FUNCTION__, 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", __FUNCTION__, reset_bit);
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return response;
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}
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EXPORT_SYMBOL_GPL(ezusb_writememory);
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EXPORT_SYMBOL_GPL(ezusb_set_reset);
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