patch-2.3.12 linux/drivers/misc/parport_daisy.c

• Lines: 474
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.11/linux/drivers/misc/parport_daisy.c
• Orig date: Thu Jul 8 15:42:20 1999

diff -u --recursive --new-file v2.3.11/linux/drivers/misc/parport_daisy.c linux/drivers/misc/parport_daisy.c
@@ -1,473 +0,0 @@
-/*
- * IEEE 1284.3 Parallel port daisy chain and multiplexor code
- * 
- * Copyright (C) 1999  Tim Waugh <tim@cyberelk.demon.co.uk>
- *
- * 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.
- *
- * ??-12-1998: Initial implementation.
- * 31-01-1999: Make port-cloning transparent.
- * 13-02-1999: Move DeviceID technique from parport_probe.
- * 13-03-1999: Get DeviceID from non-IEEE 1284.3 devices too.
- *
- */
-
-#include <linux/parport.h>
-#include <linux/delay.h>
-#include <asm/uaccess.h>
-
-#define DEBUG /* undef me for production */
-
-#ifdef DEBUG
-#define DPRINTK(stuff...) printk (stuff)
-#else
-#define DPRINTK(stuff...)
-#endif
-
-static struct daisydev {
-	struct daisydev *next;
-	struct parport *port;
-	int daisy;
-	int devnum;
-} *topology = NULL;
-
-static int numdevs = 0;
-
-/* Forward-declaration of lower-level functions. */
-static int mux_present (struct parport *port);
-static int num_mux_ports (struct parport *port);
-static int select_port (struct parport *port);
-static int assign_addrs (struct parport *port);
-
-/* Add a device to the discovered topology. */
-static void add_dev (int devnum, struct parport *port, int daisy)
-{
-	struct daisydev *newdev;
-	newdev = kmalloc (GFP_KERNEL, sizeof (struct daisydev));
-	if (newdev) {
-		newdev->port = port;
-		newdev->daisy = daisy;
-		newdev->devnum = devnum;
-		newdev->next = topology;
-		if (!topology || topology->devnum >= devnum)
-			topology = newdev;
-		else {
-			struct daisydev *prev = topology;
-			while (prev->next && prev->next->devnum < devnum)
-				prev = prev->next;
-			newdev->next = prev->next;
-			prev->next = newdev;
-		}
-	}
-}
-
-/* Clone a parport (actually, make an alias). */
-static struct parport *clone_parport (struct parport *real, int muxport)
-{
-	struct parport *extra = parport_register_port (real->base,
-						       real->irq,
-						       real->dma,
-						       real->ops);
-	if (extra) {
-		extra->portnum = real->portnum;
-		extra->physport = real;
-		extra->muxport = muxport;
-	}
-
-	return extra;
-}
-
-/* Discover the IEEE1284.3 topology on a port -- muxes and daisy chains. */
-int parport_daisy_init (struct parport *port)
-{
-	char *deviceid;
-	static const char *th[] = { /*0*/"th", "st", "nd", "rd", "th" };
-	int num_ports;
-	int i;
-
-	/* Because this is called before any other devices exist,
-	 * we don't have to claim exclusive access.  */
-
-	/* If mux present on normal port, need to create new
-	 * parports for each extra port. */
-	if (port->muxport < 0 && mux_present (port) &&
-	    /* don't be fooled: a mux must have 2 or 4 ports. */
-	    ((num_ports = num_mux_ports (port)) == 2 || num_ports == 4)) {
-		/* Leave original as port zero. */
-		port->muxport = 0;
-		printk (KERN_INFO
-			"%s: 1st (default) port of %d-way multiplexor\n",
-			port->name, num_ports);
-		for (i = 1; i < num_ports; i++) {
-			/* Clone the port. */
-			struct parport *extra = clone_parport (port, i);
-			if (!extra) {
-				if (signal_pending (current))
-					break;
-
-				schedule ();
-				continue;
-			}
-
-			printk (KERN_INFO
-				"%s: %d%s port of %d-way multiplexor on %s\n",
-				extra->name, i + 1, th[i + 1], num_ports,
-				port->name);
-
-			/* Analyse that port too.  We won't recurse
-			   forever because of the 'port->muxport < 0'
-			   test above. */
-			parport_announce_port (extra);
-		}
-	}
-
-	if (port->muxport >= 0)
-		select_port (port);
-
-	parport_daisy_deselect_all (port);
-	assign_addrs (port);
-
-	/* Count the potential legacy device at the end. */
-	add_dev (numdevs++, port, -1);
-
-	/* Find out the legacy device's IEEE 1284 device ID. */
-	deviceid = kmalloc (1000, GFP_KERNEL);
-	if (deviceid) {
-		parport_device_id (numdevs - 1, deviceid, 1000);
-		kfree (deviceid);
-	}
-
-	return 0;
-}
-
-/* Forget about devices on a physical port. */
-void parport_daisy_fini (struct parport *port)
-{
-	struct daisydev *dev, *prev = topology;
-	while (prev && prev->port == port)
-		prev = topology = topology->next;
-
-	while (prev) {
-		dev = prev->next;
-		if (dev && dev->port == port)
-			prev->next = dev->next;
-
-		prev = prev->next;
-	}
-
-	/* Gaps in the numbering could be handled better.  How should
-           someone enumerate through all IEEE1284.3 devices in the
-           topology?. */
-	if (!topology) numdevs = 0;
-	return; }
-
-/* Find a device by canonical device number. */
-struct pardevice *parport_open (int devnum, const char *name,
-				int (*pf) (void *), void (*kf) (void *),
-				void (*irqf) (int, void *, struct pt_regs *),
-				int flags, void *handle)
-{
-	struct parport *port = parport_enumerate ();
-	struct pardevice *dev;
-	int portnum;
-	int muxnum;
-	int daisynum;
-
-	if (parport_device_coords (devnum,  &portnum, &muxnum, &daisynum))
-		return NULL;
-
-	while (port && ((port->portnum != portnum) ||
-			(port->muxport != muxnum)))
-		port = port->next;
-
-	if (!port)
-		/* No corresponding parport. */
-		return NULL;
-
-	dev = parport_register_device (port, name, pf, kf,
-				       irqf, flags, handle);
-	if (dev)
-		dev->daisy = daisynum;
-
-	/* Check that there really is a device to select. */
-	if (daisynum >= 0) {
-		int selected;
-		parport_claim_or_block (dev);
-		selected = port->daisy;
-		parport_release (dev);
-
-		if (selected != port->daisy) {
-			/* No corresponding device. */
-			parport_unregister_device (dev);
-			return NULL;
-		}
-	}
-
-	return dev;
-}
-
-/* The converse of parport_open. */
-void parport_close (struct pardevice *dev)
-{
-	parport_unregister_device (dev);
-}
-
-/* Convert device coordinates into a canonical device number. */
-int parport_device_num (int parport, int mux, int daisy)
-{
-	struct daisydev *dev = topology;
-
-	while (dev && dev->port->portnum != parport &&
-	       dev->port->muxport != mux && dev->daisy != daisy)
-		dev = dev->next;
-
-	if (!dev)
-		return -ENXIO;
-
-	return dev->devnum;
-}
-
-/* Convert a canonical device number into device coordinates. */
-int parport_device_coords (int devnum, int *parport, int *mux, int *daisy)
-{
-	struct daisydev *dev = topology;
-
-	while (dev && dev->devnum != devnum)
-		dev = dev->next;
-
-	if (!dev)
-		return -ENXIO;
-
-	if (parport) *parport = dev->port->portnum;
-	if (mux) *mux = dev->port->muxport;
-	if (daisy) *daisy = dev->daisy;
-	return 0;
-}
-
-/* Send a daisy-chain-style CPP command packet. */
-static int cpp_daisy (struct parport *port, int cmd)
-{
-	unsigned char s;
-
-	parport_write_data (port, 0xaa); udelay (2);
-	parport_write_data (port, 0x55); udelay (2);
-	parport_write_data (port, 0x00); udelay (2);
-	parport_write_data (port, 0xff); udelay (2);
-	s = parport_read_status (port) & (PARPORT_STATUS_BUSY
-					  | PARPORT_STATUS_PAPEROUT
-					  | PARPORT_STATUS_SELECT
-					  | PARPORT_STATUS_ERROR);
-	if (s != (PARPORT_STATUS_BUSY
-		  | PARPORT_STATUS_PAPEROUT
-		  | PARPORT_STATUS_SELECT
-		  | PARPORT_STATUS_ERROR)) {
-		DPRINTK (KERN_DEBUG "%s: cpp_daisy: aa5500ff(%02x)\n",
-			 port->name, s);
-		return -ENXIO;
-	}
-
-	parport_write_data (port, 0x87); udelay (2);
-	s = parport_read_status (port) & (PARPORT_STATUS_BUSY
-					  | PARPORT_STATUS_PAPEROUT
-					  | PARPORT_STATUS_SELECT
-					  | PARPORT_STATUS_ERROR);
-	if (s != (PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) {
-		DPRINTK (KERN_DEBUG "%s: cpp_daisy: aa5500ff87(%02x)\n",
-			 port->name, s);
-		return -ENXIO;
-	}
-
-	parport_write_data (port, 0x78); udelay (2);
-	parport_write_data (port, cmd); udelay (2);
-	parport_frob_control (port,
-			      PARPORT_CONTROL_STROBE,
-			      PARPORT_CONTROL_STROBE);
-	udelay (1);
-	parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
-	udelay (1);
-	s = parport_read_status (port);
-	parport_write_data (port, 0xff); udelay (2);
-
-	return s;
-}
-
-/* Send a mux-style CPP command packet. */
-static int cpp_mux (struct parport *port, int cmd)
-{
-	unsigned char s;
-	int rc;
-
-	parport_write_data (port, 0xaa); udelay (2);
-	parport_write_data (port, 0x55); udelay (2);
-	parport_write_data (port, 0xf0); udelay (2);
-	parport_write_data (port, 0x0f); udelay (2);
-	parport_write_data (port, 0x52); udelay (2);
-	parport_write_data (port, 0xad); udelay (2);
-	parport_write_data (port, cmd); udelay (2);
-
-	s = parport_read_status (port);
-	if (!(s & PARPORT_STATUS_ACK)) {
-		DPRINTK (KERN_DEBUG "%s: cpp_mux: aa55f00f52ad%02x(%02x)\n",
-			 port->name, cmd, s);
-		return -EIO;
-	}
-
-	rc = (((s & PARPORT_STATUS_SELECT   ? 1 : 0) << 0) |
-	      ((s & PARPORT_STATUS_PAPEROUT ? 1 : 0) << 1) |
-	      ((s & PARPORT_STATUS_BUSY     ? 0 : 1) << 2) |
-	      ((s & PARPORT_STATUS_ERROR    ? 0 : 1) << 3));
-
-	return rc;
-}
-
-void parport_daisy_deselect_all (struct parport *port)
-{
-	cpp_daisy (port, 0x30);
-}
-
-int parport_daisy_select (struct parport *port, int daisy, int mode)
-{
-	/* mode is currently ignored. FIXME? */
-	return cpp_daisy (port, 0xe0 + daisy) & PARPORT_STATUS_ERROR;
-}
-
-static int mux_present (struct parport *port)
-{
-	return cpp_mux (port, 0x51) == 3;
-}
-
-static int num_mux_ports (struct parport *port)
-{
-	return cpp_mux (port, 0x58);
-}
-
-static int select_port (struct parport *port)
-{
-	int muxport = port->muxport;
-	return cpp_mux (port, 0x60 + muxport) == muxport;
-}
-
-static int assign_addrs (struct parport *port)
-{
-	unsigned char s, last_dev;
-	unsigned char daisy;
-	int thisdev = numdevs;
-	char *deviceid;
-
-	parport_write_data (port, 0xaa); udelay (2);
-	parport_write_data (port, 0x55); udelay (2);
-	parport_write_data (port, 0x00); udelay (2);
-	parport_write_data (port, 0xff); udelay (2);
-	s = parport_read_status (port) & (PARPORT_STATUS_BUSY
-					  | PARPORT_STATUS_PAPEROUT
-					  | PARPORT_STATUS_SELECT
-					  | PARPORT_STATUS_ERROR);
-	if (s != (PARPORT_STATUS_BUSY
-		  | PARPORT_STATUS_PAPEROUT
-		  | PARPORT_STATUS_SELECT
-		  | PARPORT_STATUS_ERROR)) {
-		DPRINTK (KERN_DEBUG "%s: assign_addrs: aa5500ff(%02x)\n",
-			 port->name, s);
-		return -ENXIO;
-	}
-
-	parport_write_data (port, 0x87); udelay (2);
-	s = parport_read_status (port) & (PARPORT_STATUS_BUSY
-					  | PARPORT_STATUS_PAPEROUT
-					  | PARPORT_STATUS_SELECT
-					  | PARPORT_STATUS_ERROR);
-	if (s != (PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) {
-		DPRINTK (KERN_DEBUG "%s: assign_addrs: aa5500ff87(%02x)\n",
-			 port->name, s);
-		return -ENXIO;
-	}
-
-	parport_write_data (port, 0x78); udelay (2);
-	last_dev = 0; /* We've just been speaking to a device, so we
-			 know there must be at least _one_ out there. */
-
-	for (daisy = 0; daisy < 4; daisy++) {
-		parport_write_data (port, daisy);
-		udelay (2);
-		parport_frob_control (port,
-				      PARPORT_CONTROL_STROBE,
-				      PARPORT_CONTROL_STROBE);
-		udelay (1);
-		parport_frob_control (port, PARPORT_CONTROL_STROBE, 0);
-		udelay (1);
-
-		if (last_dev)
-			/* No more devices. */
-			break;
-
-		last_dev = !(parport_read_status (port)
-			     & PARPORT_STATUS_BUSY);
-
-		add_dev (numdevs++, port, daisy);
-	}
-
-	parport_write_data (port, 0xff); udelay (2);
-	DPRINTK (KERN_DEBUG "%s: Found %d daisy-chained devices\n", port->name,
-		numdevs - thisdev);
-
-	/* Ask the new devices to introduce themselves. */
-	deviceid = kmalloc (1000, GFP_KERNEL);
-	if (!deviceid) return 0;
-
-	for (daisy = 0; thisdev < numdevs; thisdev++, daisy++)
-		parport_device_id (thisdev, deviceid, 1000);
-
-	kfree (deviceid);
-	return 0;
-}
-
-/* Find a device with a particular manufacturer and model string,
-   starting from a given device number.  Like the PCI equivalent,
-   'from' itself is skipped. */
-int parport_find_device (const char *mfg, const char *mdl, int from)
-{
-	struct daisydev *d = topology; /* sorted by devnum */
-
-	/* Find where to start. */
-	while (d && d->devnum <= from)
-		d = d->next;
-
-	/* Search. */
-	while (d) {
-		struct parport_device_info *info;
-		info = &d->port->probe_info[1 + d->daisy];
-		if ((!mfg || !strcmp (mfg, info->mfr)) &&
-		    (!mdl || !strcmp (mdl, info->model)))
-			break;
-
-		d = d->next;
-	}
-
-	if (d)
-		return d->devnum;
-
-	return -1;
-}
-
-/* Find a device in a particular class.  Like the PCI equivalent,
-   'from' itself is skipped. */
-int parport_find_class (parport_device_class cls, int from)
-{
-	struct daisydev *d = topology; /* sorted by devnum */
-
-	/* Find where to start. */
-	while (d && d->devnum <= from)
-		d = d->next;
-
-	/* Search. */
-	while (d && d->port->probe_info[1 + d->daisy].class != cls)
-		d = d->next;
-
-	if (d)
-		return d->devnum;
-
-	return -1;
-}