--- /dev/null
+/*****************************************************************************/
+
+/*
+ * uss720.c -- USS720 USB Parport Cable.
+ *
+ * Copyright (C) 1999, 2005, 2010
+ * Thomas Sailer (t.sailer@alumni.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 04.08.1999 Created
+ * 0.2 07.08.1999 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 10.08.1999 fixing merge errors
+ * 0.4 13.08.1999 Added Vendor/Product ID of Brad Hard's cable
+ * 0.5 20.09.1999 usb_control_msg wrapper used
+ * Nov01.2000 usb_device_table support by Adam J. Richter
+ * 08.04.2001 Identify version on module load. gb
+ * 0.6 02.09.2005 Fix "scheduling in interrupt" problem by making save/restore
+ * context asynchronous
+ *
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/parport.h>
+#include <linux/init.h>
+#include <linux/usb.h>
+#include <linux/delay.h>
+#include <linux/completion.h>
+#include <linux/kref.h>
+#include <linux/slab.h>
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v0.6"
+#define DRIVER_AUTHOR "Thomas M. Sailer, t.sailer@alumni.ethz.ch"
+#define DRIVER_DESC "USB Parport Cable driver for Cables using the Lucent Technologies USS720 Chip"
+
+/* --------------------------------------------------------------------- */
+
+struct parport_uss720_private {
+ struct usb_device *usbdev;
+ struct parport *pp;
+ struct kref ref_count;
+ __u8 reg[7]; /* USB registers */
+ struct list_head asynclist;
+ spinlock_t asynclock;
+};
+
+struct uss720_async_request {
+ struct parport_uss720_private *priv;
+ struct kref ref_count;
+ struct list_head asynclist;
+ struct completion compl;
+ struct urb *urb;
+ struct usb_ctrlrequest *dr;
+ __u8 reg[7];
+};
+
+/* --------------------------------------------------------------------- */
+
+static void destroy_priv(struct kref *kref)
+{
+ struct parport_uss720_private *priv = container_of(kref, struct parport_uss720_private, ref_count);
+
+ dev_dbg(&priv->usbdev->dev, "destroying priv datastructure\n");
+ usb_put_dev(priv->usbdev);
+ kfree(priv);
+}
+
+static void destroy_async(struct kref *kref)
+{
+ struct uss720_async_request *rq = container_of(kref, struct uss720_async_request, ref_count);
+ struct parport_uss720_private *priv = rq->priv;
+ unsigned long flags;
+
+ if (likely(rq->urb))
+ usb_free_urb(rq->urb);
+ kfree(rq->dr);
+ spin_lock_irqsave(&priv->asynclock, flags);
+ list_del_init(&rq->asynclist);
+ spin_unlock_irqrestore(&priv->asynclock, flags);
+ kfree(rq);
+ kref_put(&priv->ref_count, destroy_priv);
+}
+
+/* --------------------------------------------------------------------- */
+
+static void async_complete(struct urb *urb)
+{
+ struct uss720_async_request *rq;
+ struct parport *pp;
+ struct parport_uss720_private *priv;
+ int status = urb->status;
+
+ rq = urb->context;
+ priv = rq->priv;
+ pp = priv->pp;
+ if (status) {
+ dev_err(&urb->dev->dev, "async_complete: urb error %d\n",
+ status);
+ } else if (rq->dr->bRequest == 3) {
+ memcpy(priv->reg, rq->reg, sizeof(priv->reg));
+#if 0
+ dev_dbg(&priv->usbdev->dev, "async_complete regs %7ph\n",
+ priv->reg);
+#endif
+ /* if nAck interrupts are enabled and we have an interrupt, call the interrupt procedure */
+ if (rq->reg[2] & rq->reg[1] & 0x10 && pp)
+ parport_generic_irq(pp);
+ }
+ complete(&rq->compl);
+ kref_put(&rq->ref_count, destroy_async);
+}
+
+static struct uss720_async_request *submit_async_request(struct parport_uss720_private *priv,
+ __u8 request, __u8 requesttype, __u16 value, __u16 index,
+ gfp_t mem_flags)
+{
+ struct usb_device *usbdev;
+ struct uss720_async_request *rq;
+ unsigned long flags;
+ int ret;
+
+ if (!priv)
+ return NULL;
+ usbdev = priv->usbdev;
+ if (!usbdev)
+ return NULL;
+ rq = kzalloc(sizeof(struct uss720_async_request), mem_flags);
+ if (!rq) {
+ dev_err(&usbdev->dev, "submit_async_request out of memory\n");
+ return NULL;
+ }
+ kref_init(&rq->ref_count);
+ INIT_LIST_HEAD(&rq->asynclist);
+ init_completion(&rq->compl);
+ kref_get(&priv->ref_count);
+ rq->priv = priv;
+ rq->urb = usb_alloc_urb(0, mem_flags);
+ if (!rq->urb) {
+ kref_put(&rq->ref_count, destroy_async);
+ dev_err(&usbdev->dev, "submit_async_request out of memory\n");
+ return NULL;
+ }
+ rq->dr = kmalloc(sizeof(*rq->dr), mem_flags);
+ if (!rq->dr) {
+ kref_put(&rq->ref_count, destroy_async);
+ return NULL;
+ }
+ rq->dr->bRequestType = requesttype;
+ rq->dr->bRequest = request;
+ rq->dr->wValue = cpu_to_le16(value);
+ rq->dr->wIndex = cpu_to_le16(index);
+ rq->dr->wLength = cpu_to_le16((request == 3) ? sizeof(rq->reg) : 0);
+ usb_fill_control_urb(rq->urb, usbdev, (requesttype & 0x80) ? usb_rcvctrlpipe(usbdev, 0) : usb_sndctrlpipe(usbdev, 0),
+ (unsigned char *)rq->dr,
+ (request == 3) ? rq->reg : NULL, (request == 3) ? sizeof(rq->reg) : 0, async_complete, rq);
+ /* rq->urb->transfer_flags |= URB_ASYNC_UNLINK; */
+ spin_lock_irqsave(&priv->asynclock, flags);
+ list_add_tail(&rq->asynclist, &priv->asynclist);
+ spin_unlock_irqrestore(&priv->asynclock, flags);
+ kref_get(&rq->ref_count);
+ ret = usb_submit_urb(rq->urb, mem_flags);
+ if (!ret)
+ return rq;
+ destroy_async(&rq->ref_count);
+ dev_err(&usbdev->dev, "submit_async_request submit_urb failed with %d\n", ret);
+ return NULL;
+}
+
+static unsigned int kill_all_async_requests_priv(struct parport_uss720_private *priv)
+{
+ struct uss720_async_request *rq;
+ unsigned long flags;
+ unsigned int ret = 0;
+
+ spin_lock_irqsave(&priv->asynclock, flags);
+ list_for_each_entry(rq, &priv->asynclist, asynclist) {
+ usb_unlink_urb(rq->urb);
+ ret++;
+ }
+ spin_unlock_irqrestore(&priv->asynclock, flags);
+ return ret;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int get_1284_register(struct parport *pp, unsigned char reg, unsigned char *val, gfp_t mem_flags)
+{
+ struct parport_uss720_private *priv;
+ struct uss720_async_request *rq;
+ static const unsigned char regindex[9] = {
+ 4, 0, 1, 5, 5, 0, 2, 3, 6
+ };
+ int ret;
+
+ if (!pp)
+ return -EIO;
+ priv = pp->private_data;
+ rq = submit_async_request(priv, 3, 0xc0, ((unsigned int)reg) << 8, 0, mem_flags);
+ if (!rq) {
+ dev_err(&priv->usbdev->dev, "get_1284_register(%u) failed",
+ (unsigned int)reg);
+ return -EIO;
+ }
+ if (!val) {
+ kref_put(&rq->ref_count, destroy_async);
+ return 0;
+ }
+ if (wait_for_completion_timeout(&rq->compl, HZ)) {
+ ret = rq->urb->status;
+ *val = priv->reg[(reg >= 9) ? 0 : regindex[reg]];
+ if (ret)
+ printk(KERN_WARNING "get_1284_register: "
+ "usb error %d\n", ret);
+ kref_put(&rq->ref_count, destroy_async);
+ return ret;
+ }
+ printk(KERN_WARNING "get_1284_register timeout\n");
+ kill_all_async_requests_priv(priv);
+ return -EIO;
+}
+
+static int set_1284_register(struct parport *pp, unsigned char reg, unsigned char val, gfp_t mem_flags)
+{
+ struct parport_uss720_private *priv;
+ struct uss720_async_request *rq;
+
+ if (!pp)
+ return -EIO;
+ priv = pp->private_data;
+ rq = submit_async_request(priv, 4, 0x40, (((unsigned int)reg) << 8) | val, 0, mem_flags);
+ if (!rq) {
+ dev_err(&priv->usbdev->dev, "set_1284_register(%u,%u) failed",
+ (unsigned int)reg, (unsigned int)val);
+ return -EIO;
+ }
+ kref_put(&rq->ref_count, destroy_async);
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+/* 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;
+ __u8 reg;
+
+ if (get_1284_register(pp, 6, ®, GFP_KERNEL))
+ 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. */
+ unsigned 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, ®, GFP_KERNEL))
+ return -EIO;
+ if (priv->reg[2] & 0x01)
+ break;
+ if (time_after_eq (jiffies, expire))
+ /* The FIFO is stuck. */
+ return -EBUSY;
+ msleep_interruptible(10);
+ if (signal_pending (current))
+ break;
+ }
+ }
+ }
+ /* Set the mode. */
+ if (set_1284_register(pp, 6, m << 5, GFP_KERNEL))
+ return -EIO;
+ if (get_1284_register(pp, 6, ®, GFP_KERNEL))
+ 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, GFP_KERNEL))
+ 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 != 0 || 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(pp);
+ return 1;
+}
+#endif
+
+static void parport_uss720_write_data(struct parport *pp, unsigned char d)
+{
+ set_1284_register(pp, 0, d, GFP_KERNEL);
+}
+
+static unsigned char parport_uss720_read_data(struct parport *pp)
+{
+ unsigned char ret;
+
+ if (get_1284_register(pp, 0, &ret, GFP_KERNEL))
+ 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, GFP_KERNEL))
+ 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, GFP_KERNEL))
+ 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, GFP_KERNEL))
+ 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, GFP_KERNEL))
+ 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, 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;
+
+ dev_dbg(&intf->dev, "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);
+ dev_dbg(&intf->dev, "set interface result %d\n", i);
+
+ interface = intf->cur_altsetting;
+
+ /*
+ * Allocate parport interface
+ */
+ if (!(priv = kzalloc(sizeof(struct parport_uss720_private), 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))) {
+ printk(KERN_WARNING "uss720: could not register parport\n");
+ 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, ®, GFP_KERNEL);
+ dev_dbg(&intf->dev, "reg: %7ph\n", priv->reg);
+
+ endpoint = &interface->endpoint[2];
+ dev_dbg(&intf->dev, "epaddr %d interval %d\n",
+ 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;
+
+ dev_dbg(&intf->dev, "disconnect\n");
+ usb_set_intfdata(intf, NULL);
+ if (pp) {
+ priv = pp->private_data;
+ usbdev = priv->usbdev;
+ priv->usbdev = NULL;
+ priv->pp = NULL;
+ dev_dbg(&intf->dev, "parport_remove_port\n");
+ parport_remove_port(pp);
+ parport_put_port(pp);
+ kill_all_async_requests_priv(priv);
+ kref_put(&priv->ref_count, destroy_priv);
+ }
+ dev_dbg(&intf->dev, "disconnect done\n");
+}
+
+/* table of cables that work through this driver */
+static const struct usb_device_id uss720_table[] = {
+ { USB_DEVICE(0x047e, 0x1001) },
+ { USB_DEVICE(0x0557, 0x2001) },
+ { USB_DEVICE(0x0729, 0x1284) },
+ { USB_DEVICE(0x1293, 0x0002) },
+ { USB_DEVICE(0x050d, 0x0002) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE (usb, uss720_table);
+
+
+static struct usb_driver uss720_driver = {
+ .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;
+
+ printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
+ DRIVER_DESC "\n");
+ printk(KERN_INFO KBUILD_MODNAME ": NOTE: this is a special purpose "
+ "driver to allow nonstandard\n");
+ printk(KERN_INFO KBUILD_MODNAME ": protocols (eg. bitbang) over "
+ "USS720 usb to parallel cables\n");
+ printk(KERN_INFO KBUILD_MODNAME ": If you just want to connect to a "
+ "printer, use usblp instead\n");
+out:
+ return retval;
+}
+
+static void __exit uss720_cleanup(void)
+{
+ usb_deregister(&uss720_driver);
+}
+
+module_init(uss720_init);
+module_exit(uss720_cleanup);
+
+/* --------------------------------------------------------------------- */
Code Review / kvmfornfv.git / blobdiff