text: /*
   *
   *  BlueZ - Bluetooth protocol stack for Linux
   *
   *  Copyright (C) 2004-2008  Marcel Holtmann <marcel@holtmann.org>
   *
   *
   *  This program is free software; you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation; either version 2 of the License, or
   *  (at your option) any later version.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *  along with this program; if not, write to the Free Software
   *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   *
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  
  #include <stdio.h>
  #include <errno.h>
  #include <string.h>
  
  #include <usb.h>
  
  #include "csr.h"
  
  #ifdef NEED_USB_GET_BUSSES
  static inline struct usb_bus *usb_get_busses(void)
  {
  	return usb_busses;
  }
  #endif
  
  #ifdef NEED_USB_INTERRUPT_READ
  static inline int usb_interrupt_read(usb_dev_handle *dev, int ep, char *bytes, int size, int timeout)
  {
  	return usb_bulk_read(dev, ep, bytes, size, timeout);
  }
  #endif
  
  #ifndef USB_DIR_OUT
  #define USB_DIR_OUT	0x00
  #endif
  
  static uint16_t seqnum = 0x0000;
  
  static struct usb_dev_handle *udev = NULL;
  
  int csr_open_usb(char *device)
  {
  	struct usb_bus *bus;
  	struct usb_device *dev;
  
  	usb_init();
  
  	usb_find_busses();
  	usb_find_devices();
  
  	for (bus = usb_get_busses(); bus; bus = bus->next) {
  		for (dev = bus->devices; dev; dev = dev->next) {
  			if (dev->descriptor.bDeviceClass == USB_CLASS_HUB)
  				continue;
  
  			if (dev->descriptor.idVendor != 0x0a12 ||
  					dev->descriptor.idProduct != 0x0001)
  				continue;
  
  			goto found;
  		}
  	}
  
  	fprintf(stderr, "Device not available\n");
  
  	return -1;
  
  found:
  	udev = usb_open(dev);
  	if (!udev) {
  		fprintf(stderr, "Can't open device: %s (%d)\n",
  						strerror(errno), errno);
  		return -1;
  	}
  
  	if (usb_claim_interface(udev, 0) < 0) {
  		fprintf(stderr, "Can't claim interface: %s (%d)\n",
  						strerror(errno), errno);
  		usb_close(udev);
  		return -1;
  	}
  
  	return 0;
  }
  
  static int do_command(uint16_t command, uint16_t seqnum, uint16_t varid, uint8_t *value, uint16_t length)
  {
  	unsigned char cp[254], rp[254];
  	uint8_t cmd[10];
  	uint16_t size;
  	int len, offset = 0;
  
  	size = (length < 8) ? 9 : ((length + 1) / 2) + 5;
  
  	cmd[0] = command & 0xff;
  	cmd[1] = command >> 8;
  	cmd[2] = size & 0xff;
  	cmd[3] = size >> 8;
  	cmd[4] = seqnum & 0xff;
  	cmd[5] = seqnum >> 8;
  	cmd[6] = varid & 0xff;
  	cmd[7] = varid >> 8;
  	cmd[8] = 0x00;
  	cmd[9] = 0x00;
  
  	memset(cp, 0, sizeof(cp));
  	cp[0] = 0x00;
  	cp[1] = 0xfc;
  	cp[2] = (size * 2) + 1;
  	cp[3] = 0xc2;
  	memcpy(cp + 4, cmd, sizeof(cmd));
  	memcpy(cp + 14, value, length);
  
  	usb_interrupt_read(udev, 0x81, (void *) rp, sizeof(rp), 2);
  
  	if (usb_control_msg(udev, USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_DEVICE,
  				0, 0, 0, (void *) cp, (size * 2) + 4, 1000) < 0)
  		return -1;
  
  	switch (varid) {
  	case CSR_VARID_COLD_RESET:
  	case CSR_VARID_WARM_RESET:
  	case CSR_VARID_COLD_HALT:
  	case CSR_VARID_WARM_HALT:
  		return 0;
  	}
  
  	do {
  		len = usb_interrupt_read(udev, 0x81,
  			(void *) (rp + offset), sizeof(rp) - offset, 10);
  		offset += len;
  	} while (len > 0);
  
  	if (rp[0] != 0xff || rp[2] != 0xc2) {
  		errno = EIO;
  		return -1;
  	}
  
  	if ((rp[11] + (rp[12] << 8)) != 0) {
  		errno = ENXIO;
  		return -1;
  	}
  
  	memcpy(value, rp + 13, length);
  
  	return 0;
  }
  
  int csr_read_usb(uint16_t varid, uint8_t *value, uint16_t length)
  {
  	return do_command(0x0000, seqnum++, varid, value, length);
  }
  
  int csr_write_usb(uint16_t varid, uint8_t *value, uint16_t length)
  {
  	return do_command(0x0002, seqnum++, varid, value, length);
  }
  
  void csr_close_usb(void)
  {
  	usb_release_interface(udev, 0);
  	usb_close(udev);
  }
  