/* * 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);