[WATCHDOG] pcwd.c private data struct patch

more private data of the card to one struct.
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/char/watchdog/pcwd.c

@@ -73,7 +73,7 @@
 #include <asm/io.h>		/* For inb/outb/... */
 
 /* Module and version information */
-#define WD_VER                  "1.16 (06/12/2004)"
+#define WD_VER                  "1.16 (03/01/2006)"
 #define PFX			"pcwd: "
 
 /*
@@ -133,15 +133,17 @@ static int cards_found;
 /* internal variables */
 static atomic_t open_allowed = ATOMIC_INIT(1);
 static char expect_close;
-static struct timer_list timer;
-static unsigned long next_heartbeat;
 static int temp_panic;
-static int revision;			/* The card's revision */
-static int supports_temp;		/* Wether or not the card has a temperature device */
-static int command_mode;		/* Wether or not the card is in command mode */
-static int initial_status;		/* The card's boot status */
-static int current_readport;		/* The cards I/O address */
-static spinlock_t io_lock;
+static struct {				/* this is private data for each ISA-PC watchdog card */
+	int revision;			/* The card's revision */
+	int supports_temp;		/* Wether or not the card has a temperature device */
+	int command_mode;		/* Wether or not the card is in command mode */
+	int boot_status;		/* The card's boot status */
+	int io_addr;			/* The cards I/O address */
+	spinlock_t io_lock;		/* the lock for io operations */
+	struct timer_list timer;	/* The timer that pings the watchdog */
+	unsigned long next_heartbeat;	/* the next_heartbeat for the timer */
+} pcwd_private;
 
 /* module parameters */
 #define WATCHDOG_HEARTBEAT 60		/* 60 sec default heartbeat */
@@ -165,13 +167,13 @@ static int send_isa_command(int cmd)
 
 	/* The WCMD bit must be 1 and the command is only 4 bits in size */
 	control_status = (cmd & 0x0F) | 0x80;
-	outb_p(control_status, current_readport + 2);
+	outb_p(control_status, pcwd_private.io_addr + 2);
 	udelay(ISA_COMMAND_TIMEOUT);
 
-	port0 = inb_p(current_readport);
+	port0 = inb_p(pcwd_private.io_addr);
 	for (i = 0; i < 25; ++i) {
 		last_port0 = port0;
-		port0 = inb_p(current_readport);
+		port0 = inb_p(pcwd_private.io_addr);
 
 		if (port0 == last_port0)
 			break;	/* Data is stable */
@@ -187,7 +189,7 @@ static int set_command_mode(void)
 	int i, found=0, count=0;
 
 	/* Set the card into command mode */
-	spin_lock(&io_lock);
+	spin_lock(&pcwd_private.io_lock);
 	while ((!found) && (count < 3)) {
 		i = send_isa_command(CMD_ISA_IDLE);
 
@@ -195,15 +197,15 @@ static int set_command_mode(void)
 			found = 1;
 		else if (i == 0xF3) {
 			/* Card does not like what we've done to it */
-			outb_p(0x00, current_readport + 2);
+			outb_p(0x00, pcwd_private.io_addr + 2);
 			udelay(1200);	/* Spec says wait 1ms */
-			outb_p(0x00, current_readport + 2);
+			outb_p(0x00, pcwd_private.io_addr + 2);
 			udelay(ISA_COMMAND_TIMEOUT);
 		}
 		count++;
 	}
-	spin_unlock(&io_lock);
-	command_mode = found;
+	spin_unlock(&pcwd_private.io_lock);
+	pcwd_private.command_mode = found;
 
 	return(found);
 }
@@ -211,12 +213,12 @@ static int set_command_mode(void)
 static void unset_command_mode(void)
 {
 	/* Set the card into normal mode */
-	spin_lock(&io_lock);
-	outb_p(0x00, current_readport + 2);
+	spin_lock(&pcwd_private.io_lock);
+	outb_p(0x00, pcwd_private.io_addr + 2);
 	udelay(ISA_COMMAND_TIMEOUT);
-	spin_unlock(&io_lock);
+	spin_unlock(&pcwd_private.io_lock);
 
-	command_mode = 0;
+	pcwd_private.command_mode = 0;
 }
 
 static void pcwd_timer_ping(unsigned long data)
@@ -225,25 +227,25 @@ static void pcwd_timer_ping(unsigned long data)
 
 	/* If we got a heartbeat pulse within the WDT_INTERVAL
 	 * we agree to ping the WDT */
-	if(time_before(jiffies, next_heartbeat)) {
+	if(time_before(jiffies, pcwd_private.next_heartbeat)) {
 		/* Ping the watchdog */
-		spin_lock(&io_lock);
-		if (revision == PCWD_REVISION_A) {
+		spin_lock(&pcwd_private.io_lock);
+		if (pcwd_private.revision == PCWD_REVISION_A) {
 			/*  Rev A cards are reset by setting the WD_WDRST bit in register 1 */
-			wdrst_stat = inb_p(current_readport);
+			wdrst_stat = inb_p(pcwd_private.io_addr);
 			wdrst_stat &= 0x0F;
 			wdrst_stat |= WD_WDRST;
 
-			outb_p(wdrst_stat, current_readport + 1);
+			outb_p(wdrst_stat, pcwd_private.io_addr + 1);
 		} else {
 			/* Re-trigger watchdog by writing to port 0 */
-			outb_p(0x00, current_readport);
+			outb_p(0x00, pcwd_private.io_addr);
 		}
 
 		/* Re-set the timer interval */
-		mod_timer(&timer, jiffies + WDT_INTERVAL);
+		mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
 
-		spin_unlock(&io_lock);
+		spin_unlock(&pcwd_private.io_lock);
 	} else {
 		printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
 	}
@@ -253,18 +255,18 @@ static int pcwd_start(void)
 {
 	int stat_reg;
 
-	next_heartbeat = jiffies + (heartbeat * HZ);
+	pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
 
 	/* Start the timer */
-	mod_timer(&timer, jiffies + WDT_INTERVAL);
+	mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL);
 
 	/* Enable the port */
-	if (revision == PCWD_REVISION_C) {
-		spin_lock(&io_lock);
-		outb_p(0x00, current_readport + 3);
+	if (pcwd_private.revision == PCWD_REVISION_C) {
+		spin_lock(&pcwd_private.io_lock);
+		outb_p(0x00, pcwd_private.io_addr + 3);
 		udelay(ISA_COMMAND_TIMEOUT);
-		stat_reg = inb_p(current_readport + 2);
-		spin_unlock(&io_lock);
+		stat_reg = inb_p(pcwd_private.io_addr + 2);
+		spin_unlock(&pcwd_private.io_lock);
 		if (stat_reg & 0x10) {
 			printk(KERN_INFO PFX "Could not start watchdog\n");
 			return -EIO;
@@ -278,17 +280,17 @@ static int pcwd_stop(void)
 	int stat_reg;
 
 	/* Stop the timer */
-	del_timer(&timer);
+	del_timer(&pcwd_private.timer);
 
 	/*  Disable the board  */
-	if (revision == PCWD_REVISION_C) {
-		spin_lock(&io_lock);
-		outb_p(0xA5, current_readport + 3);
+	if (pcwd_private.revision == PCWD_REVISION_C) {
+		spin_lock(&pcwd_private.io_lock);
+		outb_p(0xA5, pcwd_private.io_addr + 3);
 		udelay(ISA_COMMAND_TIMEOUT);
-		outb_p(0xA5, current_readport + 3);
+		outb_p(0xA5, pcwd_private.io_addr + 3);
 		udelay(ISA_COMMAND_TIMEOUT);
-		stat_reg = inb_p(current_readport + 2);
-		spin_unlock(&io_lock);
+		stat_reg = inb_p(pcwd_private.io_addr + 2);
+		spin_unlock(&pcwd_private.io_lock);
 		if ((stat_reg & 0x10) == 0) {
 			printk(KERN_INFO PFX "Could not stop watchdog\n");
 			return -EIO;
@@ -300,7 +302,7 @@ static int pcwd_stop(void)
 static int pcwd_keepalive(void)
 {
 	/* user land ping */
-	next_heartbeat = jiffies + (heartbeat * HZ);
+	pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ);
 	return 0;
 }
 
@@ -318,23 +320,23 @@ static int pcwd_get_status(int *status)
 	int card_status;
 
 	*status=0;
-	spin_lock(&io_lock);
-	if (revision == PCWD_REVISION_A)
+	spin_lock(&pcwd_private.io_lock);
+	if (pcwd_private.revision == PCWD_REVISION_A)
 		/* Rev A cards return status information from
 		 * the base register, which is used for the
 		 * temperature in other cards. */
-		card_status = inb(current_readport);
+		card_status = inb(pcwd_private.io_addr);
 	else {
 		/* Rev C cards return card status in the base
 		 * address + 1 register. And use different bits
 		 * to indicate a card initiated reset, and an
 		 * over-temperature condition. And the reboot
 		 * status can be reset. */
-		card_status = inb(current_readport + 1);
+		card_status = inb(pcwd_private.io_addr + 1);
 	}
-	spin_unlock(&io_lock);
+	spin_unlock(&pcwd_private.io_lock);
 
-	if (revision == PCWD_REVISION_A) {
+	if (pcwd_private.revision == PCWD_REVISION_A) {
 		if (card_status & WD_WDRST)
 			*status |= WDIOF_CARDRESET;
 
@@ -363,10 +365,10 @@ static int pcwd_get_status(int *status)
 
 static int pcwd_clear_status(void)
 {
-	if (revision == PCWD_REVISION_C) {
-		spin_lock(&io_lock);
-		outb_p(0x00, current_readport + 1); /* clear reset status */
-		spin_unlock(&io_lock);
+	if (pcwd_private.revision == PCWD_REVISION_C) {
+		spin_lock(&pcwd_private.io_lock);
+		outb_p(0x00, pcwd_private.io_addr + 1); /* clear reset status */
+		spin_unlock(&pcwd_private.io_lock);
 	}
 	return 0;
 }
@@ -374,20 +376,20 @@ static int pcwd_clear_status(void)
 static int pcwd_get_temperature(int *temperature)
 {
 	/* check that port 0 gives temperature info and no command results */
-	if (command_mode)
+	if (pcwd_private.command_mode)
 		return -1;
 
 	*temperature = 0;
-	if (!supports_temp)
+	if (!pcwd_private.supports_temp)
 		return -ENODEV;
 
 	/*
 	 * Convert celsius to fahrenheit, since this was
 	 * the decided 'standard' for this return value.
 	 */
-	spin_lock(&io_lock);
-	*temperature = ((inb(current_readport)) * 9 / 5) + 32;
-	spin_unlock(&io_lock);
+	spin_lock(&pcwd_private.io_lock);
+	*temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32;
+	spin_unlock(&pcwd_private.io_lock);
 
 	return 0;
 }
@@ -428,7 +430,7 @@ static int pcwd_ioctl(struct inode *inode, struct file *file,
 		return put_user(status, argp);
 
 	case WDIOC_GETBOOTSTATUS:
-		return put_user(initial_status, argp);
+		return put_user(pcwd_private.boot_status, argp);
 
 	case WDIOC_GETTEMP:
 		if (pcwd_get_temperature(&temperature))
@@ -437,7 +439,7 @@ static int pcwd_ioctl(struct inode *inode, struct file *file,
 		return put_user(temperature, argp);
 
 	case WDIOC_SETOPTIONS:
-		if (revision == PCWD_REVISION_C)
+		if (pcwd_private.revision == PCWD_REVISION_C)
 		{
 			if(copy_from_user(&rv, argp, sizeof(int)))
 				return -EFAULT;
@@ -553,7 +555,7 @@ static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count,
 
 static int pcwd_temp_open(struct inode *inode, struct file *file)
 {
-	if (!supports_temp)
+	if (!pcwd_private.supports_temp)
 		return -ENODEV;
 
 	return nonseekable_open(inode, file);
@@ -621,21 +623,21 @@ static struct notifier_block pcwd_notifier = {
 
 static inline void get_support(void)
 {
-	if (inb(current_readport) != 0xF0)
-		supports_temp = 1;
+	if (inb(pcwd_private.io_addr) != 0xF0)
+		pcwd_private.supports_temp = 1;
 }
 
 static inline int get_revision(void)
 {
 	int r = PCWD_REVISION_C;
 
-	spin_lock(&io_lock);
+	spin_lock(&pcwd_private.io_lock);
 	/* REV A cards use only 2 io ports; test
 	 * presumes a floating bus reads as 0xff. */
-	if ((inb(current_readport + 2) == 0xFF) ||
-	    (inb(current_readport + 3) == 0xFF))
+	if ((inb(pcwd_private.io_addr + 2) == 0xFF) ||
+	    (inb(pcwd_private.io_addr + 3) == 0xFF))
 		r=PCWD_REVISION_A;
-	spin_unlock(&io_lock);
+	spin_unlock(&pcwd_private.io_lock);
 
 	return r;
 }
@@ -695,32 +697,32 @@ static int __devinit pcwatchdog_init(int base_addr)
 		printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 		return -ENODEV;
 	}
-	current_readport = base_addr;
+	pcwd_private.io_addr = base_addr;
 
 	/* Check card's revision */
-	revision = get_revision();
+	pcwd_private.revision = get_revision();
 
-	if (!request_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
+	if (!request_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) {
 		printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
-			current_readport);
-		current_readport = 0x0000;
+			pcwd_private.io_addr);
+		pcwd_private.io_addr = 0x0000;
 		return -EIO;
 	}
 
 	/* Initial variables */
-	supports_temp = 0;
+	pcwd_private.supports_temp = 0;
 	temp_panic = 0;
-	initial_status = 0x0000;
+	pcwd_private.boot_status = 0x0000;
 
 	/* get the boot_status */
-	pcwd_get_status(&initial_status);
+	pcwd_get_status(&pcwd_private.boot_status);
 
 	/* clear the "card caused reboot" flag */
 	pcwd_clear_status();
 
-	init_timer(&timer);
-	timer.function = pcwd_timer_ping;
-	timer.data = 0;
+	init_timer(&pcwd_private.timer);
+	pcwd_private.timer.function = pcwd_timer_ping;
+	pcwd_private.timer.data = 0;
 
 	/*  Disable the board  */
 	pcwd_stop();
@@ -729,12 +731,12 @@ static int __devinit pcwatchdog_init(int base_addr)
 	get_support();
 
 	/* Get some extra info from the hardware (in command/debug/diag mode) */
-	if (revision == PCWD_REVISION_A)
-		printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", current_readport);
-	else if (revision == PCWD_REVISION_C) {
+	if (pcwd_private.revision == PCWD_REVISION_A)
+		printk(KERN_INFO PFX "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", pcwd_private.io_addr);
+	else if (pcwd_private.revision == PCWD_REVISION_C) {
 		firmware = get_firmware();
 		printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port 0x%04x (Firmware version: %s)\n",
-			current_readport, firmware);
+			pcwd_private.io_addr, firmware);
 		kfree(firmware);
 		option_switches = get_option_switches();
 		printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
@@ -750,23 +752,23 @@ static int __devinit pcwatchdog_init(int base_addr)
 	} else {
 		/* Should NEVER happen, unless get_revision() fails. */
 		printk(KERN_INFO PFX "Unable to get revision\n");
-		release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
-		current_readport = 0x0000;
+		release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+		pcwd_private.io_addr = 0x0000;
 		return -1;
 	}
 
-	if (supports_temp)
+	if (pcwd_private.supports_temp)
 		printk(KERN_INFO PFX "Temperature Option Detected\n");
 
-	if (initial_status & WDIOF_CARDRESET)
+	if (pcwd_private.boot_status & WDIOF_CARDRESET)
 		printk(KERN_INFO PFX "Previous reboot was caused by the card\n");
 
-	if (initial_status & WDIOF_OVERHEAT) {
+	if (pcwd_private.boot_status & WDIOF_OVERHEAT) {
 		printk(KERN_EMERG PFX "Card senses a CPU Overheat. Panicking!\n");
 		printk(KERN_EMERG PFX "CPU Overheat\n");
 	}
 
-	if (initial_status == 0)
+	if (pcwd_private.boot_status == 0)
 		printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 
 	/* Check that the heartbeat value is within it's range ; if not reset to the default */
@@ -780,19 +782,19 @@ static int __devinit pcwatchdog_init(int base_addr)
 	if (ret) {
 		printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 			ret);
-		release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
-		current_readport = 0x0000;
+		release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+		pcwd_private.io_addr = 0x0000;
 		return ret;
 	}
 
-	if (supports_temp) {
+	if (pcwd_private.supports_temp) {
 		ret = misc_register(&temp_miscdev);
 		if (ret) {
 			printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 				TEMP_MINOR, ret);
 			unregister_reboot_notifier(&pcwd_notifier);
-			release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
-			current_readport = 0x0000;
+			release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+			pcwd_private.io_addr = 0x0000;
 			return ret;
 		}
 	}
@@ -801,11 +803,11 @@ static int __devinit pcwatchdog_init(int base_addr)
 	if (ret) {
 		printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 			WATCHDOG_MINOR, ret);
-		if (supports_temp)
+		if (pcwd_private.supports_temp)
 			misc_deregister(&temp_miscdev);
 		unregister_reboot_notifier(&pcwd_notifier);
-		release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
-		current_readport = 0x0000;
+		release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+		pcwd_private.io_addr = 0x0000;
 		return ret;
 	}
 
@@ -823,11 +825,11 @@ static void __devexit pcwatchdog_exit(void)
 
 	/* Deregister */
 	misc_deregister(&pcwd_miscdev);
-	if (supports_temp)
+	if (pcwd_private.supports_temp)
 		misc_deregister(&temp_miscdev);
 	unregister_reboot_notifier(&pcwd_notifier);
-	release_region(current_readport, (revision == PCWD_REVISION_A) ? 2 : 4);
-	current_readport = 0x0000;
+	release_region(pcwd_private.io_addr, (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4);
+	pcwd_private.io_addr = 0x0000;
 	cards_found--;
 }
 
@@ -891,7 +893,7 @@ static int __init pcwd_init_module(void)
 {
 	int i, found = 0;
 
-	spin_lock_init(&io_lock);
+	spin_lock_init(&pcwd_private.io_lock);
 
 	for (i = 0; pcwd_ioports[i] != 0; i++) {
 		if (pcwd_checkcard(pcwd_ioports[i])) {
@@ -910,7 +912,7 @@ static int __init pcwd_init_module(void)
 
 static void __exit pcwd_cleanup_module(void)
 {
-	if (current_readport)
+	if (pcwd_private.io_addr)
 		pcwatchdog_exit();
 	return;
 }