path: root/drivers/usb/gadget/printer.c

/*
 * printer.c -- Printer gadget driver
 *
 * Copyright (C) 2003-2005 David Brownell
 * Copyright (C) 2006 Craig W. Nadler
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/utsname.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/cdev.h>

#include <asm/byteorder.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <asm/system.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>

#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/g_printer.h>

#include "gadget_chips.h"


/*
 * Kbuild is not very cooperative with respect to linking separately
 * compiled library objects into one module.  So for now we won't use
 * separate compilation ... ensuring init/exit sections work to shrink
 * the runtime footprint, and giving us at least some parts of what
 * a "gcc --combine ... part1.c part2.c part3.c ... " build would.
 */
#include "usbstring.c"
#include "config.c"
#include "epautoconf.c"

/*-------------------------------------------------------------------------*/

#define DRIVER_DESC		"Printer Gadget"
#define DRIVER_VERSION		"2007 OCT 06"

static DEFINE_MUTEX(printer_mutex);
static const char shortname [] = "printer";
static const char driver_desc [] = DRIVER_DESC;

static dev_t g_printer_devno;

static struct class *usb_gadget_class;

/*-------------------------------------------------------------------------*/

struct printer_dev {
	spinlock_t		lock;		/* lock this structure */
	/* lock buffer lists during read/write calls */
	struct mutex		lock_printer_io;
	struct usb_gadget	*gadget;
	struct usb_request	*req;		/* for control responses */
	u8			config;
	s8			interface;
	struct usb_ep		*in_ep, *out_ep;
	const struct usb_endpoint_descriptor
				*in, *out;
	struct list_head	rx_reqs;	/* List of free RX structs */
	struct list_head	rx_reqs_active;	/* List of Active RX xfers */
	struct list_head	rx_buffers;	/* List of completed xfers */
	/* wait until there is data to be read. */
	wait_queue_head_t	rx_wait;
	struct list_head	tx_reqs;	/* List of free TX structs */
	struct list_head	tx_reqs_active; /* List of Active TX xfers */
	/* Wait until there are write buffers available to use. */
	wait_queue_head_t	tx_wait;
	/* Wait until all write buffers have been sent. */
	wait_queue_head_t	tx_flush_wait;
	struct usb_request	*current_rx_req;
	size_t			current_rx_bytes;
	u8			*current_rx_buf;
	u8			printer_status;
	u8			reset_printer;
	struct cdev		printer_cdev;
	struct device		*pdev;
	u8			printer_cdev_open;
	wait_queue_head_t	wait;
};

static struct printer_dev usb_printer_gadget;

/*-------------------------------------------------------------------------*/

/* DO NOT REUSE THESE IDs with a protocol-incompatible driver!!  Ever!!
 * Instead:  allocate your own, using normal USB-IF procedures.
 */

/* Thanks to NetChip Technologies for donating this product ID.
 */
#define PRINTER_VENDOR_NUM	0x0525		/* NetChip */
#define PRINTER_PRODUCT_NUM	0xa4a8		/* Linux-USB Printer Gadget */

/* Some systems will want different product identifiers published in the
 * device descriptor, either numbers or strings or both.  These string
 * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
 */

static ushort idVendor;
module_param(idVendor, ushort, S_IRUGO);
MODULE_PARM_DESC(idVendor, "USB Vendor ID");

static ushort i