uss720.c

linux-2.6.15.6

	unsigned char d;

	d = priv->reg[1] | 0x10;
	if (set_1284_register(pp, 2, d, GFP_KERNEL))
		return;
	priv->reg[1] = d;
}

static void parport_uss720_data_forward (struct parport *pp)
{
	struct parport_uss720_private *priv = pp->private_data;	
	unsigned char d;

	d = priv->reg[1] & ~0x20;
	if (set_1284_register(pp, 2, d, GFP_KERNEL))
		return;
	priv->reg[1] = d;
}

static void parport_uss720_data_reverse (struct parport *pp)
{
	struct parport_uss720_private *priv = pp->private_data;	
	unsigned char d;

	d = priv->reg[1] | 0x20;
	if (set_1284_register(pp, 2, d, GFP_KERNEL))
		return;
	priv->reg[1] = d;
}

static void parport_uss720_init_state(struct pardevice *dev, struct parport_state *s)
{
	s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
	s->u.pc.ecr = 0x24;
}

static void parport_uss720_save_state(struct parport *pp, struct parport_state *s)
{
	struct parport_uss720_private *priv = pp->private_data;	

#if 0
	if (get_1284_register(pp, 2, NULL, GFP_ATOMIC))
		return;
#endif
	s->u.pc.ctr = priv->reg[1];
	s->u.pc.ecr = priv->reg[2];
}

static void parport_uss720_restore_state(struct parport *pp, struct parport_state *s)
{
	struct parport_uss720_private *priv = pp->private_data;

	set_1284_register(pp, 2, s->u.pc.ctr, GFP_ATOMIC);
	set_1284_register(pp, 6, s->u.pc.ecr, GFP_ATOMIC);
	get_1284_register(pp, 2, NULL, GFP_ATOMIC);
	priv->reg[1] = s->u.pc.ctr;
	priv->reg[2] = s->u.pc.ecr;
}

static size_t parport_uss720_epp_read_data(struct parport *pp, void *buf, size_t length, int flags)
{
	struct parport_uss720_private *priv = pp->private_data;	
	size_t got = 0;

	if (change_mode(pp, ECR_EPP))
		return 0;
	for (; got < length; got++) {
		if (get_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
			break;
		buf++;
		if (priv->reg[0] & 0x01) {
			clear_epp_timeout(pp);
			break;
		}
	}
	change_mode(pp, ECR_PS2);
	return got;
}

static size_t parport_uss720_epp_write_data(struct parport *pp, const void *buf, size_t length, int flags)
{
#if 0
	struct parport_uss720_private *priv = pp->private_data;	
	size_t written = 0;

	if (change_mode(pp, ECR_EPP))
		return 0;
	for (; written < length; written++) {
		if (set_1284_register(pp, 4, (char *)buf, GFP_KERNEL))
			break;
		((char*)buf)++;
		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
			break;
		if (priv->reg[0] & 0x01) {
			clear_epp_timeout(pp);
			break;
		}
	}
	change_mode(pp, ECR_PS2);
	return written;
#else
	struct parport_uss720_private *priv = pp->private_data;
	struct usb_device *usbdev = priv->usbdev;
	int rlen;
	int i;

	if (!usbdev)
		return 0;
	if (change_mode(pp, ECR_EPP))
		return 0;
	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buf, length, &rlen, 20000);
	if (i)
		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buf, length, rlen);
	change_mode(pp, ECR_PS2);
	return rlen;
#endif
}

static size_t parport_uss720_epp_read_addr(struct parport *pp, void *buf, size_t length, int flags)
{
	struct parport_uss720_private *priv = pp->private_data;	
	size_t got = 0;

	if (change_mode(pp, ECR_EPP))
		return 0;
	for (; got < length; got++) {
		if (get_1284_register(pp, 3, (char *)buf, GFP_KERNEL))
			break;
		buf++;
		if (priv->reg[0] & 0x01) {
			clear_epp_timeout(pp);
			break;
		}
	}
	change_mode(pp, ECR_PS2);
	return got;
}

static size_t parport_uss720_epp_write_addr(struct parport *pp, const void *buf, size_t length, int flags)
{
	struct parport_uss720_private *priv = pp->private_data;	
	size_t written = 0;

	if (change_mode(pp, ECR_EPP))
		return 0;
	for (; written < length; written++) {
		if (set_1284_register(pp, 3, *(char *)buf, GFP_KERNEL))
			break;
		buf++;
		if (get_1284_register(pp, 1, NULL, GFP_KERNEL))
			break;
		if (priv->reg[0] & 0x01) {
			clear_epp_timeout(pp);
			break;
		}
	}
	change_mode(pp, ECR_PS2);
	return written;
}

static size_t parport_uss720_ecp_write_data(struct parport *pp, const void *buffer, size_t len, int flags)
{
	struct parport_uss720_private *priv = pp->private_data;
	struct usb_device *usbdev = priv->usbdev;
	int rlen;
	int i;

	if (!usbdev)
		return 0;
	if (change_mode(pp, ECR_ECP))
		return 0;
	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
	if (i)
		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
	change_mode(pp, ECR_PS2);
	return rlen;
}

static size_t parport_uss720_ecp_read_data(struct parport *pp, void *buffer, size_t len, int flags)
{
	struct parport_uss720_private *priv = pp->private_data;
	struct usb_device *usbdev = priv->usbdev;
	int rlen;
	int i;

	if (!usbdev)
		return 0;
	if (change_mode(pp, ECR_ECP))
		return 0;
	i = usb_bulk_msg(usbdev, usb_rcvbulkpipe(usbdev, 2), buffer, len, &rlen, 20000);
	if (i)
		printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %Zu rlen %u\n", buffer, len, rlen);
	change_mode(pp, ECR_PS2);
	return rlen;
}

static size_t parport_uss720_ecp_write_addr(struct parport *pp, const void *buffer, size_t len, int flags)
{
	size_t written = 0;

	if (change_mode(pp, ECR_ECP))
		return 0;
	for (; written < len; written++) {
		if (set_1284_register(pp, 5, *(char *)buffer, GFP_KERNEL))
			break;
		buffer++;
	}
	change_mode(pp, ECR_PS2);
	return written;
}

static size_t parport_uss720_write_compat(struct parport *pp, const void *buffer, size_t len, int flags)
{
	struct parport_uss720_private *priv = pp->private_data;
	struct usb_device *usbdev = priv->usbdev;
	int rlen;
	int i;

	if (!usbdev)
		return 0;
	if (change_mode(pp, ECR_PPF))
		return 0;
	i = usb_bulk_msg(usbdev, usb_sndbulkpipe(usbdev, 1), (void *)buffer, len, &rlen, 20000);
	if (i)
		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %Zu rlen %u\n", buffer, len, rlen);
	change_mode(pp, ECR_PS2);
	return rlen;
}

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

static struct parport_operations parport_uss720_ops = 
{
	.owner =		THIS_MODULE,
	.write_data =		parport_uss720_write_data,
	.read_data =		parport_uss720_read_data,

	.write_control =	parport_uss720_write_control,
	.read_control =		parport_uss720_read_control,
	.frob_control =		parport_uss720_frob_control,

	.read_status =		parport_uss720_read_status,

	.enable_irq =		parport_uss720_enable_irq,
	.disable_irq =		parport_uss720_disable_irq,

	.data_forward =		parport_uss720_data_forward,
	.data_reverse =		parport_uss720_data_reverse,

	.init_state =		parport_uss720_init_state,
	.save_state =		parport_uss720_save_state,
	.restore_state =	parport_uss720_restore_state,

	.epp_write_data =	parport_uss720_epp_write_data,
	.epp_read_data =	parport_uss720_epp_read_data,
	.epp_write_addr =	parport_uss720_epp_write_addr,
	.epp_read_addr =	parport_uss720_epp_read_addr,

	.ecp_write_data =	parport_uss720_ecp_write_data,
	.ecp_read_data =	parport_uss720_ecp_read_data,
	.ecp_write_addr =	parport_uss720_ecp_write_addr,

	.compat_write_data =	parport_uss720_write_compat,
	.nibble_read_data =	parport_ieee1284_read_nibble,
	.byte_read_data =	parport_ieee1284_read_byte,
};

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

static int uss720_probe(struct usb_interface *intf,
			const struct usb_device_id *id)
{
	struct usb_device *usbdev = usb_get_dev(interface_to_usbdev(intf));
	struct usb_host_interface *interface;
	struct usb_host_endpoint *endpoint;
	struct parport_uss720_private *priv;
	struct parport *pp;
	unsigned char reg;
	int i;

	dbg("probe: vendor id 0x%x, device id 0x%x\n",
	    le16_to_cpu(usbdev->descriptor.idVendor),
	    le16_to_cpu(usbdev->descriptor.idProduct));

	/* our known interfaces have 3 alternate settings */
	if (intf->num_altsetting != 3) {
		usb_put_dev(usbdev);
		return -ENODEV;
	}
	i = usb_set_interface(usbdev, intf->altsetting->desc.bInterfaceNumber, 2);
	dbg("set inteface result %d", i);

	interface = intf->cur_altsetting;

	/*
	 * Allocate parport interface 
	 */
	if (!(priv = kcalloc(sizeof(struct parport_uss720_private), 1, GFP_KERNEL))) {
		usb_put_dev(usbdev);
		return -ENOMEM;
	}
	priv->pp = NULL;
	priv->usbdev = usbdev;
	kref_init(&priv->ref_count);
	spin_lock_init(&priv->asynclock);
	INIT_LIST_HEAD(&priv->asynclist);
	if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
		warn("could not register parport");
		goto probe_abort;
	}

	priv->pp = pp;
	pp->private_data = priv;
	pp->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP | PARPORT_MODE_ECP | PARPORT_MODE_COMPAT;

	/* set the USS720 control register to manual mode, no ECP compression, enable all ints */
	set_1284_register(pp, 7, 0x00, GFP_KERNEL);
	set_1284_register(pp, 6, 0x30, GFP_KERNEL);  /* PS/2 mode */
	set_1284_register(pp, 2, 0x0c, GFP_KERNEL);
	/* debugging */
	get_1284_register(pp, 0, &reg, GFP_KERNEL);
	dbg("reg: %02x %02x %02x %02x %02x %02x %02x",
	    priv->reg[0], priv->reg[1], priv->reg[2], priv->reg[3], priv->reg[4], priv->reg[5], priv->reg[6]);

	endpoint = &interface->endpoint[2];
	dbg("epaddr %d interval %d", endpoint->desc.bEndpointAddress, endpoint->desc.bInterval);
	parport_announce_port(pp);

	usb_set_intfdata(intf, pp);
	return 0;

probe_abort:
	kill_all_async_requests_priv(priv);
	kref_put(&priv->ref_count, destroy_priv);
	return -ENODEV;
}

static void uss720_disconnect(struct usb_interface *intf)
{
	struct parport *pp = usb_get_intfdata(intf);
	struct parport_uss720_private *priv;
	struct usb_device *usbdev;

	dbg("disconnect");
	usb_set_intfdata(intf, NULL);
	if (pp) {
		priv = pp->private_data;
		usbdev = priv->usbdev;
		priv->usbdev = NULL;
		priv->pp = NULL;
		dbg("parport_remove_port");
		parport_remove_port(pp);
		parport_put_port(pp);
		kill_all_async_requests_priv(priv);
		kref_put(&priv->ref_count, destroy_priv);
	}
	dbg("disconnect done");
}

/* table of cables that work through this driver */
static struct usb_device_id uss720_table [] = {
	{ USB_DEVICE(0x047e, 0x1001) },
	{ USB_DEVICE(0x0557, 0x2001) },
	{ USB_DEVICE(0x0729, 0x1284) },
	{ USB_DEVICE(0x1293, 0x0002) },
	{ }						/* Terminating entry */
};

MODULE_DEVICE_TABLE (usb, uss720_table);


static struct usb_driver uss720_driver = {
	.owner =	THIS_MODULE,
	.name =		"uss720",
	.probe =	uss720_probe,
	.disconnect =	uss720_disconnect,
	.id_table =	uss720_table,
};

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

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

static int __init uss720_init(void)
{
	int retval;
	retval = usb_register(&uss720_driver);
	if (retval)
		goto out;

	info(DRIVER_VERSION ":" DRIVER_DESC);
	info("NOTE: this is a special purpose driver to allow nonstandard");
	info("protocols (eg. bitbang) over USS720 usb to parallel cables");
	info("If you just want to connect to a printer, use usblp instead");
out:
	return retval;
}

static void __exit uss720_cleanup(void)
{
	usb_deregister(&uss720_driver);
}

module_init(uss720_init);
module_exit(uss720_cleanup);

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