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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 7\n",
(unsigned int)reg, ret);
ret = -1;
} 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);
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%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;
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 %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 %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, HZ*20);
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))
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 %u\n", 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%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;
}
/* 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);
/* --------------------------------------------------------------------- */
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