minor TTY changes for 2.5.53

diff -Nru a/arch/mips/au1000/common/serial.c b/arch/mips/au1000/common/serial.c
@@ -2682,9 +2682,9 @@
 		       (state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
 		       state->port, state->irq,
 		       uart_config[state->type].name);
-		tty_register_devfs(&serial_driver, 0,
+		tty_register_device(&serial_driver,
 				   serial_driver.minor_start + state->line);
-		tty_register_devfs(&callout_driver, 0,
+		tty_register_device(&callout_driver,
 				   callout_driver.minor_start + state->line);
 	}
 	return 0;

@@ -2772,9 +2772,9 @@
 	      state->iomem_base ? "iomem" : "port",
 	      state->iomem_base ? (unsigned long)state->iomem_base :
 	      state->port, state->irq, uart_config[state->type].name);
-	tty_register_devfs(&serial_driver, 0,
+	tty_register_device(&serial_driver,
 			   serial_driver.minor_start + state->line); 
-	tty_register_devfs(&callout_driver, 0,
+	tty_register_device(&callout_driver,
 			   callout_driver.minor_start + state->line);
 	return state->line + SERIAL_DEV_OFFSET;
 }

@@ -2801,9 +2801,9 @@
 	/* These will be hidden, because they are devices that will no longer
 	 * be available to the system. (ie, PCMCIA modems, once ejected)
 	 */
-	tty_unregister_devfs(&serial_driver,
+	tty_unregister_device(&serial_driver,
 			     serial_driver.minor_start + state->line);
-	tty_unregister_devfs(&callout_driver,
+	tty_unregister_device(&callout_driver,
 			     callout_driver.minor_start + state->line);
 	restore_flags(flags);
 }

diff -Nru a/drivers/char/dz.c b/drivers/char/dz.c
@@ -1425,9 +1425,9 @@
 		printk("ttyS%02d at 0x%08x (irq = %d)\n", info->line,
 		       info->port, SERIAL);
 
-		tty_register_devfs(&serial_driver, 0,
+		tty_register_device(&serial_driver,
 		                   serial_driver.minor_start + info->line);
-		tty_register_devfs(&callout_driver, 0,
+		tty_register_device(&callout_driver,
 		                   callout_driver.minor_start + info->line);
 	}
 

diff -Nru a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
@@ -279,7 +279,7 @@
 	for (i = 0; i < hvc_driver.num; i++) {
 		hvc_struct[i].lock = SPIN_LOCK_UNLOCKED;
 		hvc_struct[i].index = i;
-		tty_register_devfs(&hvc_driver, 0, hvc_driver.minor_start + i);
+		tty_register_device(&hvc_driver, hvc_driver.minor_start + i);
 	}
 
 	if (tty_register_driver(&hvc_driver))

diff -Nru a/drivers/char/ip2main.c b/drivers/char/ip2main.c
@@ -899,11 +899,11 @@
 			        {
 				    if ( pB->i2eChannelMap[box] & (1 << j) )
 				    {
-				        tty_register_devfs(&ip2_tty_driver,
-					    0, j + ABS_BIGGEST_BOX *
+				        tty_register_device(&ip2_tty_driver,
+					    j + ABS_BIGGEST_BOX *
 						    (box+i*ABS_MAX_BOXES));
-				            tty_register_devfs(&ip2_callout_driver,
-					    0, j + ABS_BIGGEST_BOX *
+				            tty_register_device(&ip2_callout_driver,
+					    j + ABS_BIGGEST_BOX *
 						    (box+i*ABS_MAX_BOXES));
 			    	    }
 			        }

diff -Nru a/drivers/char/pty.c b/drivers/char/pty.c
@@ -97,7 +97,7 @@
 			}
 		}
 #endif
-		tty_unregister_devfs (&tty->link->driver, minor(tty->device));
+		tty_unregister_device (&tty->link->driver, minor(tty->device));
 		tty_vhangup(tty->link);
 	}
 }

@@ -307,6 +307,7 @@
 	}
 }
 
+extern void tty_register_devfs (struct tty_driver *driver, unsigned int flags, unsigned minor);
 static int pty_open(struct tty_struct *tty, struct file * filp)
 {
 	int	retval;

diff -Nru a/drivers/char/tty_io.c b/drivers/char/tty_io.c
@@ -1351,7 +1351,7 @@
 		set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
 		minor -= driver->minor_start;
 		devpts_pty_new(driver->other->name_base + minor, MKDEV(driver->other->major, minor + driver->other->minor_start));
-		tty_register_devfs(&pts_driver[major], DEVFS_FL_DEFAULT,
+		tty_register_device(&pts_driver[major],
 				   pts_driver[major].minor_start + minor);
 		noctty = 1;
 		goto init_dev_done;

@@ -2038,9 +2038,6 @@
 	tty->driver.write(tty, 0, &ch, 1);
 }
 
-/*
- * Register a tty device described by <driver>, with minor number <minor>.
- */
 void tty_register_devfs (struct tty_driver *driver, unsigned int flags, unsigned minor)
 {
 #ifdef CONFIG_DEVFS_FS

@@ -2077,8 +2074,21 @@
 	devfs_remove(driver->name, minor-driver->minor_start+driver->name_base);
 }
 
-EXPORT_SYMBOL(tty_register_devfs);
-EXPORT_SYMBOL(tty_unregister_devfs);
+/*
+ * Register a tty device described by <driver>, with minor number <minor>.
+ */
+void tty_register_device (struct tty_driver *driver, unsigned minor)
+{
+	tty_register_devfs(driver, 0, minor);
+}
+
+void tty_unregister_device (struct tty_driver *driver, unsigned minor)
+{
+	tty_unregister_devfs(driver, minor);
+}
+
+EXPORT_SYMBOL(tty_register_device);
+EXPORT_SYMBOL(tty_unregister_device);
 
 /*
  * Called by a tty driver to register itself.

@@ -2104,7 +2114,7 @@
 	
 	if ( !(driver->flags & TTY_DRIVER_NO_DEVFS) ) {
 		for(i = 0; i < driver->num; i++)
-		    tty_register_devfs(driver, 0, driver->minor_start + i);
+		    tty_register_device(driver, driver->minor_start + i);
 	}
 	proc_tty_register_driver(driver);
 	return error;

@@ -2159,7 +2169,7 @@
 			driver->termios_locked[i] = NULL;
 			kfree(tp);
 		}
-		tty_unregister_devfs(driver, driver->minor_start + i);
+		tty_unregister_device(driver, driver->minor_start + i);
 	}
 	proc_tty_unregister_driver(driver);
 	return 0;

diff -Nru a/drivers/char/vt.c b/drivers/char/vt.c
@@ -2646,7 +2646,7 @@
 	int i;
 
 	for (i = 0; i < console_driver.num; i++)
-		tty_register_devfs (&console_driver, DEVFS_FL_DEFAULT,
+		tty_register_device (&console_driver,
 				    console_driver.minor_start + i);
 }
 

diff -Nru a/drivers/serial/core.c b/drivers/serial/core.c
@@ -2098,7 +2098,7 @@
 	 * Register the port whether it's detected or not.  This allows
 	 * setserial to be used to alter this ports parameters.
 	 */
-	tty_register_devfs(drv->tty_driver, 0, drv->minor + port->line);
+	tty_register_device(drv->tty_driver, drv->minor + port->line);
 
 	if (port->type != PORT_UNKNOWN) {
 		unsigned long flags;

@@ -2155,7 +2155,7 @@
 	/*
 	 * Remove the devices from devfs
 	 */
-	tty_unregister_devfs(drv->tty_driver, drv->minor + port->line);
+	tty_unregister_device(drv->tty_driver, drv->minor + port->line);
 
 	/*
 	 * Free the port IO and memory resources, if any.

diff -Nru a/drivers/tc/zs.c b/drivers/tc/zs.c
@@ -1971,9 +1971,9 @@
 		printk("ttyS%02d at 0x%08x (irq = %d)", info->line, 
 		       info->port, info->irq);
 		printk(" is a Z85C30 SCC\n");
-		tty_register_devfs(&serial_driver, 0,
+		tty_register_device(&serial_driver,
 				   serial_driver.minor_start + info->line);
-		tty_register_devfs(&callout_driver, 0,
+		tty_register_device(&callout_driver,
 				   callout_driver.minor_start + info->line);
 
 	}

diff -Nru a/drivers/usb/class/bluetty.c b/drivers/usb/class/bluetty.c
@@ -1201,7 +1201,7 @@
 		     bluetooth, endpoint->bInterval);
 
 	/* initialize the devfs nodes for this device and let the user know what bluetooths we are bound to */
-	tty_register_devfs (&bluetooth_tty_driver, 0, minor);
+	tty_register_device (&bluetooth_tty_driver, minor);
 	info("Bluetooth converter now attached to ttyUB%d (or usb/ttub/%d for devfs)", minor, minor);
 
 	bluetooth_table[minor] = bluetooth;

@@ -1267,7 +1267,7 @@
 		if (bluetooth->interrupt_in_buffer)
 			kfree (bluetooth->interrupt_in_buffer);
 
-		tty_unregister_devfs (&bluetooth_tty_driver, bluetooth->minor);
+		tty_unregister_device (&bluetooth_tty_driver, bluetooth->minor);
 
 		for (i = 0; i < NUM_BULK_URBS; ++i) {
 			if (bluetooth->write_urb_pool[i]) {

diff -Nru a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
@@ -361,7 +361,7 @@
 			usb_unlink_urb(acm->writeurb);
 			usb_unlink_urb(acm->readurb);
 		} else {
-			tty_unregister_devfs(&acm_tty_driver, acm->minor);
+			tty_unregister_device(&acm_tty_driver, acm->minor);
 			acm_table[acm->minor] = NULL;
 			usb_free_urb(acm->ctrlurb);
 			usb_free_urb(acm->readurb);

@@ -649,7 +649,7 @@
 		usb_driver_claim_interface(&acm_driver, acm->iface + 0, acm);
 		usb_driver_claim_interface(&acm_driver, acm->iface + 1, acm);
 
-		tty_register_devfs(&acm_tty_driver, 0, minor);
+		tty_register_device(&acm_tty_driver, minor);
 
 		acm_table[minor] = acm;
 		dev_set_drvdata (&intf->dev, acm);

@@ -681,7 +681,7 @@
 	usb_driver_release_interface(&acm_driver, acm->iface + 1);
 
 	if (!acm->used) {
-		tty_unregister_devfs(&acm_tty_driver, acm->minor);
+		tty_unregister_device(&acm_tty_driver, acm->minor);
 		acm_table[acm->minor] = NULL;
 		usb_free_urb(acm->ctrlurb);
 		usb_free_urb(acm->readurb);

diff -Nru a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
@@ -78,7 +78,7 @@
 
 	minor = port->number;
 
-	tty_register_devfs (&usb_serial_tty_driver, 0, minor);
+	tty_register_device (&usb_serial_tty_driver, minor);
 	info("%s converter now attached to ttyUSB%d (or usb/tts/%d for devfs)",
 	     driver->name, minor, minor);
 

@@ -110,7 +110,7 @@
 	}
 exit:
 	minor = port->number;
-	tty_unregister_devfs (&usb_serial_tty_driver, minor);
+	tty_unregister_device (&usb_serial_tty_driver, minor);
 	info("%s converter now disconnected from ttyUSB%d",
 	     driver->name, minor);
 

diff -Nru a/include/linux/tty.h b/include/linux/tty.h
@@ -379,9 +379,8 @@
 extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
 extern int tty_register_driver(struct tty_driver *driver);
 extern int tty_unregister_driver(struct tty_driver *driver);
-extern void tty_register_devfs (struct tty_driver *driver, unsigned int flags,
-				unsigned minor);
-extern void tty_unregister_devfs (struct tty_driver *driver, unsigned minor);
+extern void tty_register_device(struct tty_driver *driver, unsigned minor);
+extern void tty_unregister_device(struct tty_driver *driver, unsigned minor);
 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 			     int buflen);
 extern void tty_write_message(struct tty_struct *tty, char *msg);

diff -Nru a/drivers/char/tty_io.c b/drivers/char/tty_io.c
@@ -90,6 +90,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/smp_lock.h>
+#include <linux/device.h>
 
 #include <asm/uaccess.h>
 #include <asm/system.h>

@@ -2271,12 +2272,19 @@
 extern int vty_init(void);
 #endif
 
+struct device_class tty_devclass = {
+	.name	= "tty",
+};
+EXPORT_SYMBOL(tty_devclass);
+
 /*
  * Ok, now we can initialize the rest of the tty devices and can count
  * on memory allocations, interrupts etc..
  */
 void __init tty_init(void)
 {
+	devclass_register(&tty_devclass);
+
 	/*
 	 * dev_tty_driver and dev_console_driver are actually magic
 	 * devices which get redirected at open time.  Nevertheless,

diff -Nru a/include/linux/tty_driver.h b/include/linux/tty_driver.h
@@ -227,4 +227,6 @@
 #define SERIAL_TYPE_NORMAL	1
 #define SERIAL_TYPE_CALLOUT	2
 
+extern struct device_class tty_devclass;
+
 #endif /* #ifdef _LINUX_TTY_DRIVER_H */

diff -Nru a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
@@ -128,6 +128,7 @@
 	device->driver.bus = &usb_serial_bus_type;
 	device->driver.probe = usb_serial_device_probe;
 	device->driver.remove = usb_serial_device_remove;
+	device->driver.devclass = &tty_devclass;
 
 	retval = driver_register(&device->driver);
 

diff -Nru a/drivers/char/n_tty.c b/drivers/char/n_tty.c
@@ -48,10 +48,6 @@
 #define IS_CONSOLE_DEV(dev)	(kdev_val(dev) == __mkdev(TTY_MAJOR,0))
 #define IS_SYSCONS_DEV(dev)	(kdev_val(dev) == __mkdev(TTYAUX_MAJOR,1))
 
-#ifndef MIN
-#define MIN(a,b)	((a) < (b) ? (a) : (b))
-#endif
-
 /* number of characters left in xmit buffer before select has we have room */
 #define WAKEUP_CHARS 256
 

@@ -725,16 +721,18 @@
 
 	if (tty->real_raw) {
 		spin_lock_irqsave(&tty->read_lock, cpuflags);
-		i = MIN(count, MIN(N_TTY_BUF_SIZE - tty->read_cnt,
-				   N_TTY_BUF_SIZE - tty->read_head));
+		i = min(N_TTY_BUF_SIZE - tty->read_cnt,
+			N_TTY_BUF_SIZE - tty->read_head);
+		i = min(count, i);
 		memcpy(tty->read_buf + tty->read_head, cp, i);
 		tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1);
 		tty->read_cnt += i;
 		cp += i;
 		count -= i;
 
-		i = MIN(count, MIN(N_TTY_BUF_SIZE - tty->read_cnt,
-			       N_TTY_BUF_SIZE - tty->read_head));
+		i = min(N_TTY_BUF_SIZE - tty->read_cnt,
+			N_TTY_BUF_SIZE - tty->read_head);
+		i = min(count, i);
 		memcpy(tty->read_buf + tty->read_head, cp, i);
 		tty->read_head = (tty->read_head + i) & (N_TTY_BUF_SIZE-1);
 		tty->read_cnt += i;

@@ -915,7 +913,8 @@
 
 	retval = 0;
 	spin_lock_irqsave(&tty->read_lock, flags);
-	n = MIN(*nr, MIN(tty->read_cnt, N_TTY_BUF_SIZE - tty->read_tail));
+	n = min(tty->read_cnt, N_TTY_BUF_SIZE - tty->read_tail);
+	n = min((ssize_t)*nr, n);
 	spin_unlock_irqrestore(&tty->read_lock, flags);
 	if (n) {
 		mb();

diff -Nru a/drivers/char/pty.c b/drivers/char/pty.c
@@ -64,8 +64,6 @@
 static struct pty_struct ptm_state[UNIX98_NR_MAJORS][NR_PTYS];
 #endif
 
-#define MIN(a,b)	((a) < (b) ? (a) : (b))
-
 static void pty_close(struct tty_struct * tty, struct file * filp)
 {
 	if (!tty)

@@ -156,7 +154,7 @@
 				n = count;
 			if (!n) break;
 
-			n  = MIN(n, PTY_BUF_SIZE);
+			n  = min(n, PTY_BUF_SIZE);
 			n -= copy_from_user(temp_buffer, buf, n);
 			if (!n) {
 				if (!c)

diff -Nru a/drivers/char/tty_io.c b/drivers/char/tty_io.c
@@ -159,13 +159,6 @@
 extern void tx3912_rs_init(void);
 extern void hvc_console_init(void);
 
-#ifndef MIN
-#define MIN(a,b)	((a) < (b) ? (a) : (b))
-#endif
-#ifndef MAX
-#define MAX(a,b)	((a) < (b) ? (b) : (a))
-#endif
-
 static struct tty_struct *alloc_tty_struct(void)
 {
 	struct tty_struct *tty;

@@ -714,7 +707,7 @@
 		unlock_kernel();
 	} else {
 		for (;;) {
-			unsigned long size = MAX(PAGE_SIZE*2,16384);
+			unsigned long size = max((unsigned long)PAGE_SIZE*2, 16384UL);
 			if (size > count)
 				size = count;
 			lock_kernel();