patch-2.2.18 linux/drivers/usb/uss720.c

• Lines: 664
• Date: Fri Sep 1 13:51:30 2000
• Orig file: v2.2.17/drivers/usb/uss720.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/uss720.c linux/drivers/usb/uss720.c
@@ -0,0 +1,663 @@
+/*****************************************************************************/
+
+/*
+ *	uss720.c  --  USS720 USB Parport Cable.
+ *
+ *	Copyright (C) 1999
+ *	    Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *	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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  Based on parport_pc.c
+ *
+ *  History:
+ *   0.1  04.08.99  Created
+ *   0.2  07.08.99  Some fixes mainly suggested by Tim Waugh
+ *		    Interrupt handling currently disabled because
+ *		    usb_request_irq crashes somewhere within ohci.c
+ *		    for no apparent reason (that is for me, anyway)
+ *		    ECP currently untested
+ *   0.3  10.08.99  fixing merge errors
+ *   0.4  13.08.99  Added Vendor/Product ID of Brad Hard's cable
+ *   0.5  20.09.99  usb_control_msg wrapper used
+ *
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/parport.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+
+/* --------------------------------------------------------------------- */
+
+struct parport_uss720_private {
+	struct usb_device *usbdev;
+	void *irqhandle;
+	unsigned int irqpipe;
+	unsigned char reg[7];  /* USB registers */
+};
+
+/* --------------------------------------------------------------------- */
+
+static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val)
+{
+	struct parport_uss720_private *priv = pp->private_data;
+	struct usb_device *usbdev = priv->usbdev;
+	static const unsigned char regindex[9] = {
+		4, 0, 1, 5, 5, 0, 2, 3, 6
+	};
+	int ret;
+
+	if (!usbdev)
+		return -1;
+	ret = usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev,0), 3, 0xc0, ((unsigned int)reg) << 8, 0, priv->reg, 7, HZ);
+	if (ret) {
+		printk(KERN_DEBUG "uss720: get_1284_register(%d) failed, status 0x%x\n",
+		       (unsigned int)reg, ret);
+	} else {
+#if 0
+		printk(KERN_DEBUG "uss720: get_1284_register(%d) return %02x %02x %02x %02x %02x %02x %02x\n",
+		       (unsigned int)reg, (unsigned int)priv->reg[0], (unsigned int)priv->reg[1],
+		       (unsigned int)priv->reg[2], (unsigned int)priv->reg[3], (unsigned int)priv->reg[4],
+		       (unsigned int)priv->reg[5], (unsigned int)priv->reg[6]);
+#endif
+		/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
+		if (priv->reg[2] & priv->reg[1] & 0x10)
+			parport_generic_irq(0, pp, NULL);
+	}
+	if (val)
+		*val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
+	return ret;
+}
+
+static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val)
+{
+	struct parport_uss720_private *priv = pp->private_data;
+	struct usb_device *usbdev = priv->usbdev;
+	int ret;
+
+	if (!usbdev)
+		return -1;
+	ret = usb_control_msg(usbdev, usb_sndctrlpipe(usbdev,0), 4, 0x40, (((unsigned int)reg) << 8) | val, 0, NULL, 0, HZ);
+	if (ret) {
+		printk(KERN_DEBUG "uss720: set_1284_register(%u,0x%02x) failed, status 0x%x\n", 
+		       (unsigned int)reg, (unsigned int)val, ret);
+	} else {
+#if 0
+		printk(KERN_DEBUG "uss720: set_1284_register(%u,0x%02x)\n", 
+		       (unsigned int)reg, (unsigned int)val);
+#endif
+	}
+	return ret;
+}
+
+/* --------------------------------------------------------------------- */
+
+/* ECR modes */
+#define ECR_SPP 00
+#define ECR_PS2 01
+#define ECR_PPF 02
+#define ECR_ECP 03
+#define ECR_EPP 04
+
+/* Safely change the mode bits in the ECR */
+static int change_mode(struct parport *pp, int m)
+{
+	struct parport_uss720_private *priv = pp->private_data;
+	int mode;
+
+	if (get_1284_register(pp, 6, NULL))
+		return -EIO;
+	/* Bits <7:5> contain the mode. */
+	mode = (priv->reg[2] >> 5) & 0x7;
+	if (mode == m)
+		return 0;
+	/* We have to go through mode 000 or 001 */
+	if (mode > ECR_PS2 && m > ECR_PS2)
+		if (change_mode(pp, ECR_PS2))
+			return -EIO;
+
+	if (m <= ECR_PS2 && !(priv->reg[1] & 0x20)) {
+		/* This mode resets the FIFO, so we may
+		 * have to wait for it to drain first. */
+		long expire = jiffies + pp->physport->cad->timeout;
+		switch (mode) {
+		case ECR_PPF: /* Parallel Port FIFO mode */
+		case ECR_ECP: /* ECP Parallel Port mode */
+			/* Poll slowly. */
+			for (;;) {
+				if (get_1284_register(pp, 6, NULL))
+					return -EIO;
+				if (priv->reg[2] & 0x01)
+					break;
+				if (time_after_eq (jiffies, expire))
+					/* The FIFO is stuck. */
+					return -EBUSY;
+				current->state = TASK_INTERRUPTIBLE;
+				schedule_timeout((HZ + 99) / 100);
+				if (signal_pending (current))
+					break;
+			}
+		}
+	}
+	/* Set the mode. */
+	if (set_1284_register(pp, 6, m << 5))
+		return -EIO;
+	return 0;
+}
+
+/*
+ * Clear TIMEOUT BIT in EPP MODE
+ */
+static int clear_epp_timeout(struct parport *pp)
+{
+	unsigned char stat;
+
+	if (get_1284_register(pp, 1, &stat))
+		return 1;
+	return stat & 1;
+}
+
+/*
+ * Access functions.
+ */
+#if 0
+static int uss720_irq(int usbstatus, void *buffer, int len, void *dev_id)
+{
+	struct parport *pp = (struct parport *)dev_id;
+	struct parport_uss720_private *priv = pp->private_data;	
+
+	if (usbstatus != USB_ST_NOERROR || len < 4 || !buffer)
+		return 1;
+	memcpy(priv->reg, buffer, 4);
+	/* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
+	if (priv->reg[2] & priv->reg[1] & 0x10)
+		parport_generic_irq(0, pp, NULL);
+	return 1;
+}
+#endif
+
+static void parport_uss720_write_data(struct parport *pp, unsigned char d)
+{
+	set_1284_register(pp, 0, d);
+}
+
+static unsigned char parport_uss720_read_data(struct parport *pp)
+{
+	unsigned char ret;
+
+	if (get_1284_register(pp, 0, &ret))
+		return 0;
+	return ret;
+}
+
+static void parport_uss720_write_control(struct parport *pp, unsigned char d)
+{
+	struct parport_uss720_private *priv = pp->private_data;	
+
+	d = (d & 0xf) | (priv->reg[1] & 0xf0);
+	if (set_1284_register(pp, 2, d))
+		return;
+	priv->reg[1] = d;
+}
+
+static unsigned char parport_uss720_read_control(struct parport *pp)
+{
+	struct parport_uss720_private *priv = pp->private_data;	
+	return priv->reg[1] & 0xf; /* Use soft copy */
+}
+
+static unsigned char parport_uss720_frob_control(struct parport *pp, unsigned char mask, unsigned char val)
+{
+	struct parport_uss720_private *priv = pp->private_data;	
+	unsigned char d;
+
+	mask &= 0x0f;
+	val &= 0x0f;
+	d = (priv->reg[1] & (~mask)) ^ val;
+	if (set_1284_register(pp, 2, d))
+		return 0;
+	priv->reg[1] = d;
+	return d & 0xf;
+}
+
+static unsigned char parport_uss720_read_status(struct parport *pp)
+{
+	unsigned char ret;
+
+	if (get_1284_register(pp, 1, &ret))
+		return 0;
+	return ret & 0xf8;
+}
+
+static void parport_uss720_disable_irq(struct parport *pp)
+{
+	struct parport_uss720_private *priv = pp->private_data;	
+	unsigned char d;
+
+	d = priv->reg[1] & ~0x10;
+	if (set_1284_register(pp, 2, d))
+		return;
+	priv->reg[1] = d;
+}
+
+static void parport_uss720_enable_irq(struct parport *pp)
+{
+	struct parport_uss720_private *priv = pp->private_data;	
+	unsigned char d;
+
+	d = priv->reg[1] | 0x10;
+	if (set_1284_register(pp, 2, d))
+		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))
+		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))
+		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 (get_1284_register(pp, 2, NULL))
+		return;
+	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)
+{
+	set_1284_register(pp, 2, s->u.pc.ctr);
+	set_1284_register(pp, 6, s->u.pc.ecr);
+	get_1284_register(pp, 2, NULL);
+}
+
+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))
+			break;
+		((char*)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))
+			break;
+		((char*)buf)++;
+		if (get_1284_register(pp, 1, NULL))
+			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, HZ*20);
+	if (i)
+		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %u 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))
+			break;
+		((char*)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))
+			break;
+		((char*)buf)++;
+		if (get_1284_register(pp, 1, NULL))
+			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, HZ*20);
+	if (i)
+		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %u 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, HZ*20);
+	if (i)
+		printk(KERN_ERR "uss720: recvbulk ep 2 buf %p len %u 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))
+			break;
+		((char*)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, HZ*20);
+	if (i)
+		printk(KERN_ERR "uss720: sendbulk ep 1 buf %p len %u rlen %u\n", buffer, len, rlen);
+	change_mode(pp, ECR_PS2);
+	return rlen;
+}
+
+void parport_uss720_inc_use_count(void)
+{
+#ifdef MODULE
+	MOD_INC_USE_COUNT;
+#endif
+}
+
+void parport_uss720_dec_use_count(void)
+{
+#ifdef MODULE
+	MOD_DEC_USE_COUNT;
+#endif
+}
+
+/* --------------------------------------------------------------------- */
+
+static struct parport_operations parport_uss720_ops = 
+{
+	parport_uss720_write_data,
+	parport_uss720_read_data,
+
+	parport_uss720_write_control,
+	parport_uss720_read_control,
+	parport_uss720_frob_control,
+
+	parport_uss720_read_status,
+
+	parport_uss720_enable_irq,
+	parport_uss720_disable_irq,
+
+	parport_uss720_data_forward,
+	parport_uss720_data_reverse,
+
+	parport_uss720_init_state,
+	parport_uss720_save_state,
+	parport_uss720_restore_state,
+
+	parport_uss720_inc_use_count,
+	parport_uss720_dec_use_count,
+
+	parport_uss720_epp_write_data,
+	parport_uss720_epp_read_data,
+	parport_uss720_epp_write_addr,
+	parport_uss720_epp_read_addr,
+
+	parport_uss720_ecp_write_data,
+	parport_uss720_ecp_read_data,
+	parport_uss720_ecp_write_addr,
+
+	parport_uss720_write_compat,
+	parport_ieee1284_read_nibble,
+	parport_ieee1284_read_byte,
+};
+
+/* --------------------------------------------------------------------- */
+
+static void * uss720_probe(struct usb_device *usbdev, unsigned int ifnum)
+{
+	struct usb_interface_descriptor *interface;
+	struct usb_endpoint_descriptor *endpoint;
+	struct parport_uss720_private *priv;
+	struct parport *pp;
+	int i;
+
+	if ((usbdev->descriptor.idVendor != 0x047e || usbdev->descriptor.idProduct != 0x1001) &&
+	    (usbdev->descriptor.idVendor != 0x0557 || usbdev->descriptor.idProduct != 0x2001) &&
+	    (usbdev->descriptor.idVendor != 0x0729 || usbdev->descriptor.idProduct != 0x1284))
+		return NULL;
+
+	printk(KERN_DEBUG "uss720: probe: vendor id 0x%x, device id 0x%x\n",
+	       usbdev->descriptor.idVendor, usbdev->descriptor.idProduct);
+
+	/* our known interfaces have 3 alternate settings */
+	if (usbdev->actconfig->interface[ifnum].num_altsetting != 3)
+		return NULL;
+
+	i = usb_set_interface(usbdev, ifnum, 2);
+	printk(KERN_DEBUG "uss720: set inteface result %d\n", i);
+
+	interface = &usbdev->actconfig->interface[ifnum].altsetting[2];
+
+	/*
+	 * Allocate parport interface 
+	 */
+	printk(KERN_INFO "uss720: (C) 1999 by Thomas Sailer, <sailer@ife.ee.ethz.ch>\n");
+
+	if (!(priv = kmalloc(sizeof(struct parport_uss720_private), GFP_KERNEL)))
+		return NULL;
+	if (!(pp = parport_register_port(0, PARPORT_IRQ_NONE, PARPORT_DMA_NONE, &parport_uss720_ops))) {
+		printk(KERN_WARNING "usb-uss720: could not register parport\n");
+		goto probe_abort;
+	}
+
+	pp->private_data = priv;
+	priv->usbdev = usbdev;
+	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);
+	set_1284_register(pp, 6, 0x30);  /* PS/2 mode */
+	set_1284_register(pp, 2, 0x0c);
+	/* debugging */
+	get_1284_register(pp, 0, NULL);
+	printk("uss720: reg: %02x %02x %02x %02x %02x %02x %02x\n",
+	       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];
+	printk(KERN_DEBUG "uss720: epaddr %d interval %d\n", endpoint->bEndpointAddress, endpoint->bInterval);
+#if 0
+	priv->irqpipe = usb_rcvctrlpipe(usbdev, endpoint->bEndpointAddress);
+	i = usb_request_irq(usbdev, priv->irqpipe,
+				  uss720_irq, endpoint->bInterval,
+				  pp, &priv->irqhandle);
+	if (i) {
+		printk (KERN_WARNING "usb-uss720: usb_request_irq failed (0x%x)\n", i);
+		goto probe_abort_port;
+	}
+#endif
+	parport_proc_register(pp);
+	parport_announce_port(pp);
+
+	MOD_INC_USE_COUNT;
+	return pp;
+
+#if 0
+probe_abort_port:
+	parport_unregister_port(pp);
+#endif
+probe_abort:
+	kfree(priv);
+	return NULL;
+}
+
+static void uss720_disconnect(struct usb_device *usbdev, void *ptr)
+{
+	struct parport *pp = (struct parport *)ptr;
+	struct parport_uss720_private *priv = pp->private_data;
+
+#if 0
+	usb_release_irq(usbdev, priv->irqhandle, priv->irqpipe);
+#endif
+	priv->usbdev = NULL;
+	parport_proc_unregister(pp);
+	parport_unregister_port(pp);
+	kfree(priv);
+	MOD_DEC_USE_COUNT;
+}
+
+static struct usb_driver uss720_driver = {
+	"uss720",
+	uss720_probe,
+	uss720_disconnect,
+	{ NULL, NULL }
+};
+
+/* --------------------------------------------------------------------- */
+
+MODULE_AUTHOR("Thomas M. Sailer, sailer@ife.ee.ethz.ch");
+MODULE_DESCRIPTION("USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip");
+
+static int __init uss720_init(void)
+{
+	if (usb_register(&uss720_driver) < 0)
+		return -1;
+
+	printk(KERN_INFO "uss720: USB<->IEEE1284 cable driver v0.4 registered.\n"
+	       KERN_INFO "uss720: (C) 1999 by Thomas Sailer, <sailer@ife.ee.ethz.ch>\n");
+	return 0;
+}
+
+static void __exit uss720_cleanup(void)
+{
+	usb_deregister(&uss720_driver);
+}
+
+module_init(uss720_init);
+module_exit(uss720_cleanup);
+
+/* --------------------------------------------------------------------- */