uss720.c
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上传日期:2013-04-10
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- /*****************************************************************************/
- /*
- * 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
- * Nov01.00 usb_device_table support by Adam J. Richter
- * 08.04.01 Identify version on module load. gb
- *
- */
- /*****************************************************************************/
- #include <linux/module.h>
- #include <linux/socket.h>
- #include <linux/parport.h>
- #include <linux/init.h>
- #include <linux/usb.h>
- /*
- * Version Information
- */
- #define DRIVER_VERSION "v0.5"
- #define DRIVER_AUTHOR "Thomas M. Sailer, sailer@ife.ee.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;
- 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 != 7) {
- printk(KERN_DEBUG "uss720: get_1284_register(%d) failed, status 0x%x expected 7n",
- (unsigned int)reg, ret);
- ret = -1;
- } else {
- #if 0
- printk(KERN_DEBUG "uss720: get_1284_register(%d) return %02x %02x %02x %02x %02x %02x %02xn",
- (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);
- ret = 0;
- }
- 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%xn",
- (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;
- set_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 %Zu rlen %un", 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 %Zu rlen %un", 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 %Zu rlen %un", 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 %Zu rlen %un", buffer, len, rlen);
- change_mode(pp, ECR_PS2);
- return rlen;
- }
- void parport_uss720_inc_use_count(void)
- {
- MOD_INC_USE_COUNT;
- }
- void parport_uss720_dec_use_count(void)
- {
- MOD_DEC_USE_COUNT;
- }
- /* --------------------------------------------------------------------- */
- 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,
- const struct usb_device_id *id)
- {
- struct usb_interface_descriptor *interface;
- struct usb_endpoint_descriptor *endpoint;
- struct parport_uss720_private *priv;
- struct parport *pp;
- int i;
- printk(KERN_DEBUG "uss720: probe: vendor id 0x%x, device id 0x%xn",
- 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 %dn", 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 parportn");
- 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 %02xn",
- 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 %dn", 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;
- }
- /* 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 = {
- 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)
- {
- if (usb_register(&uss720_driver) < 0)
- return -1;
- info(DRIVER_VERSION ":" DRIVER_DESC);
- return 0;
- }
- static void __exit uss720_cleanup(void)
- {
- usb_deregister(&uss720_driver);
- }
- module_init(uss720_init);
- module_exit(uss720_cleanup);
- /* --------------------------------------------------------------------- */