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Diffstat (limited to 'drivers/char/watchdog/sc1200wdt.c')
-rw-r--r--drivers/char/watchdog/sc1200wdt.c463
1 files changed, 0 insertions, 463 deletions
diff --git a/drivers/char/watchdog/sc1200wdt.c b/drivers/char/watchdog/sc1200wdt.c
deleted file mode 100644
index 9670d47190d..00000000000
--- a/drivers/char/watchdog/sc1200wdt.c
+++ /dev/null
@@ -1,463 +0,0 @@
-/*
- * National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver
- * (c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.com>,
- * All Rights Reserved.
- * Based on wdt.c and wdt977.c by Alan Cox and Woody Suwalski respectively.
- *
- * 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.
- *
- * The author(s) of this software shall not be held liable for damages
- * of any nature resulting due to the use of this software. This
- * software is provided AS-IS with no warranties.
- *
- * Changelog:
- * 20020220 Zwane Mwaikambo Code based on datasheet, no hardware.
- * 20020221 Zwane Mwaikambo Cleanups as suggested by Jeff Garzik and Alan Cox.
- * 20020222 Zwane Mwaikambo Added probing.
- * 20020225 Zwane Mwaikambo Added ISAPNP support.
- * 20020412 Rob Radez Broke out start/stop functions
- * <rob@osinvestor.com> Return proper status instead of temperature warning
- * Add WDIOC_GETBOOTSTATUS and WDIOC_SETOPTIONS ioctls
- * Fix CONFIG_WATCHDOG_NOWAYOUT
- * 20020530 Joel Becker Add Matt Domsch's nowayout module option
- * 20030116 Adam Belay Updated to the latest pnp code
- *
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/miscdevice.h>
-#include <linux/watchdog.h>
-#include <linux/ioport.h>
-#include <linux/spinlock.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/init.h>
-#include <linux/pnp.h>
-#include <linux/fs.h>
-
-#include <asm/semaphore.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-
-#define SC1200_MODULE_VER "build 20020303"
-#define SC1200_MODULE_NAME "sc1200wdt"
-#define PFX SC1200_MODULE_NAME ": "
-
-#define MAX_TIMEOUT 255 /* 255 minutes */
-#define PMIR (io) /* Power Management Index Register */
-#define PMDR (io+1) /* Power Management Data Register */
-
-/* Data Register indexes */
-#define FER1 0x00 /* Function enable register 1 */
-#define FER2 0x01 /* Function enable register 2 */
-#define PMC1 0x02 /* Power Management Ctrl 1 */
-#define PMC2 0x03 /* Power Management Ctrl 2 */
-#define PMC3 0x04 /* Power Management Ctrl 3 */
-#define WDTO 0x05 /* Watchdog timeout register */
-#define WDCF 0x06 /* Watchdog config register */
-#define WDST 0x07 /* Watchdog status register */
-
-/* WDCF bitfields - which devices assert WDO */
-#define KBC_IRQ 0x01 /* Keyboard Controller */
-#define MSE_IRQ 0x02 /* Mouse */
-#define UART1_IRQ 0x03 /* Serial0 */
-#define UART2_IRQ 0x04 /* Serial1 */
-/* 5 -7 are reserved */
-
-static char banner[] __initdata = KERN_INFO PFX SC1200_MODULE_VER;
-static int timeout = 1;
-static int io = -1;
-static int io_len = 2; /* for non plug and play */
-static struct semaphore open_sem;
-static char expect_close;
-static spinlock_t sc1200wdt_lock; /* io port access serialisation */
-
-#if defined CONFIG_PNP
-static int isapnp = 1;
-static struct pnp_dev *wdt_dev;
-
-module_param(isapnp, int, 0);
-MODULE_PARM_DESC(isapnp, "When set to 0 driver ISA PnP support will be disabled");
-#endif
-
-module_param(io, int, 0);
-MODULE_PARM_DESC(io, "io port");
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "range is 0-255 minutes, default is 1");
-
-static int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-
-
-
-/* Read from Data Register */
-static inline void sc1200wdt_read_data(unsigned char index, unsigned char *data)
-{
- spin_lock(&sc1200wdt_lock);
- outb_p(index, PMIR);
- *data = inb(PMDR);
- spin_unlock(&sc1200wdt_lock);
-}
-
-
-/* Write to Data Register */
-static inline void sc1200wdt_write_data(unsigned char index, unsigned char data)
-{
- spin_lock(&sc1200wdt_lock);
- outb_p(index, PMIR);
- outb(data, PMDR);
- spin_unlock(&sc1200wdt_lock);
-}
-
-
-static void sc1200wdt_start(void)
-{
- unsigned char reg;
-
- sc1200wdt_read_data(WDCF, &reg);
- /* assert WDO when any of the following interrupts are triggered too */
- reg |= (KBC_IRQ | MSE_IRQ | UART1_IRQ | UART2_IRQ);
- sc1200wdt_write_data(WDCF, reg);
- /* set the timeout and get the ball rolling */
- sc1200wdt_write_data(WDTO, timeout);
-}
-
-
-static void sc1200wdt_stop(void)
-{
- sc1200wdt_write_data(WDTO, 0);
-}
-
-
-/* This returns the status of the WDO signal, inactive high. */
-static inline int sc1200wdt_status(void)
-{
- unsigned char ret;
-
- sc1200wdt_read_data(WDST, &ret);
- /* If the bit is inactive, the watchdog is enabled, so return
- * KEEPALIVEPING which is a bit of a kludge because there's nothing
- * else for enabled/disabled status
- */
- return (ret & 0x01) ? 0 : WDIOF_KEEPALIVEPING; /* bits 1 - 7 are undefined */
-}
-
-
-static int sc1200wdt_open(struct inode *inode, struct file *file)
-{
- /* allow one at a time */
- if (down_trylock(&open_sem))
- return -EBUSY;
-
- if (timeout > MAX_TIMEOUT)
- timeout = MAX_TIMEOUT;
-
- sc1200wdt_start();
- printk(KERN_INFO PFX "Watchdog enabled, timeout = %d min(s)", timeout);
-
- return nonseekable_open(inode, file);
-}
-
-
-static int sc1200wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
-{
- int new_timeout;
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
- .firmware_version = 0,
- .identity = "PC87307/PC97307",
- };
-
- switch (cmd) {
- default:
- return -ENOTTY;
-
- case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &ident, sizeof ident))
- return -EFAULT;
- return 0;
-
- case WDIOC_GETSTATUS:
- return put_user(sc1200wdt_status(), p);
-
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_KEEPALIVE:
- sc1200wdt_write_data(WDTO, timeout);
- return 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_timeout, p))
- return -EFAULT;
-
- /* the API states this is given in secs */
- new_timeout /= 60;
- if (new_timeout < 0 || new_timeout > MAX_TIMEOUT)
- return -EINVAL;
-
- timeout = new_timeout;
- sc1200wdt_write_data(WDTO, timeout);
- /* fall through and return the new timeout */
-
- case WDIOC_GETTIMEOUT:
- return put_user(timeout * 60, p);
-
- case WDIOC_SETOPTIONS:
- {
- int options, retval = -EINVAL;
-
- if (get_user(options, p))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD) {
- sc1200wdt_stop();
- retval = 0;
- }
-
- if (options & WDIOS_ENABLECARD) {
- sc1200wdt_start();
- retval = 0;
- }
-
- return retval;
- }
- }
-}
-
-
-static int sc1200wdt_release(struct inode *inode, struct file *file)
-{
- if (expect_close == 42) {
- sc1200wdt_stop();
- printk(KERN_INFO PFX "Watchdog disabled\n");
- } else {
- sc1200wdt_write_data(WDTO, timeout);
- printk(KERN_CRIT PFX "Unexpected close!, timeout = %d min(s)\n", timeout);
- }
- up(&open_sem);
- expect_close = 0;
-
- return 0;
-}
-
-
-static ssize_t sc1200wdt_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
-{
- if (len) {
- if (!nowayout) {
- size_t i;
-
- expect_close = 0;
-
- for (i = 0; i != len; i++) {
- char c;
-
- if (get_user(c, data+i))
- return -EFAULT;
- if (c == 'V')
- expect_close = 42;
- }
- }
-
- sc1200wdt_write_data(WDTO, timeout);
- return len;
- }
-
- return 0;
-}
-
-
-static int sc1200wdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
-{
- if (code == SYS_DOWN || code == SYS_HALT)
- sc1200wdt_stop();
-
- return NOTIFY_DONE;
-}
-
-
-static struct notifier_block sc1200wdt_notifier =
-{
- .notifier_call = sc1200wdt_notify_sys,
-};
-
-static const struct file_operations sc1200wdt_fops =
-{
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = sc1200wdt_write,
- .ioctl = sc1200wdt_ioctl,
- .open = sc1200wdt_open,
- .release = sc1200wdt_release,
-};
-
-static struct miscdevice sc1200wdt_miscdev =
-{
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &sc1200wdt_fops,
-};
-
-
-static int __init sc1200wdt_probe(void)
-{
- /* The probe works by reading the PMC3 register's default value of 0x0e
- * there is one caveat, if the device disables the parallel port or any
- * of the UARTs we won't be able to detect it.
- * Nb. This could be done with accuracy by reading the SID registers, but
- * we don't have access to those io regions.
- */
-
- unsigned char reg;
-
- sc1200wdt_read_data(PMC3, &reg);
- reg &= 0x0f; /* we don't want the UART busy bits */
- return (reg == 0x0e) ? 0 : -ENODEV;
-}
-
-
-#if defined CONFIG_PNP
-
-static struct pnp_device_id scl200wdt_pnp_devices[] = {
- /* National Semiconductor PC87307/PC97307 watchdog component */
- {.id = "NSC0800", .driver_data = 0},
- {.id = ""},
-};
-
-static int scl200wdt_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
-{
- /* this driver only supports one card at a time */
- if (wdt_dev || !isapnp)
- return -EBUSY;
-
- wdt_dev = dev;
- io = pnp_port_start(wdt_dev, 0);
- io_len = pnp_port_len(wdt_dev, 0);
-
- if (!request_region(io, io_len, SC1200_MODULE_NAME)) {
- printk(KERN_ERR PFX "Unable to register IO port %#x\n", io);
- return -EBUSY;
- }
-
- printk(KERN_INFO "scl200wdt: PnP device found at io port %#x/%d\n", io, io_len);
- return 0;
-}
-
-static void scl200wdt_pnp_remove(struct pnp_dev * dev)
-{
- if (wdt_dev){
- release_region(io, io_len);
- wdt_dev = NULL;
- }
-}
-
-static struct pnp_driver scl200wdt_pnp_driver = {
- .name = "scl200wdt",
- .id_table = scl200wdt_pnp_devices,
- .probe = scl200wdt_pnp_probe,
- .remove = scl200wdt_pnp_remove,
-};
-
-#endif /* CONFIG_PNP */
-
-
-static int __init sc1200wdt_init(void)
-{
- int ret;
-
- printk("%s\n", banner);
-
- spin_lock_init(&sc1200wdt_lock);
- sema_init(&open_sem, 1);
-
-#if defined CONFIG_PNP
- if (isapnp) {
- ret = pnp_register_driver(&scl200wdt_pnp_driver);
- if (ret)
- goto out_clean;
- }
-#endif
-
- if (io == -1) {
- printk(KERN_ERR PFX "io parameter must be specified\n");
- ret = -EINVAL;
- goto out_pnp;
- }
-
-#if defined CONFIG_PNP
- /* now that the user has specified an IO port and we haven't detected
- * any devices, disable pnp support */
- isapnp = 0;
- pnp_unregister_driver(&scl200wdt_pnp_driver);
-#endif
-
- if (!request_region(io, io_len, SC1200_MODULE_NAME)) {
- printk(KERN_ERR PFX "Unable to register IO port %#x\n", io);
- ret = -EBUSY;
- goto out_pnp;
- }
-
- ret = sc1200wdt_probe();
- if (ret)
- goto out_io;
-
- ret = register_reboot_notifier(&sc1200wdt_notifier);
- if (ret) {
- printk(KERN_ERR PFX "Unable to register reboot notifier err = %d\n", ret);
- goto out_io;
- }
-
- ret = misc_register(&sc1200wdt_miscdev);
- if (ret) {
- printk(KERN_ERR PFX "Unable to register miscdev on minor %d\n", WATCHDOG_MINOR);
- goto out_rbt;
- }
-
- /* ret = 0 */
-
-out_clean:
- return ret;
-
-out_rbt:
- unregister_reboot_notifier(&sc1200wdt_notifier);
-
-out_io:
- release_region(io, io_len);
-
-out_pnp:
-#if defined CONFIG_PNP
- if (isapnp)
- pnp_unregister_driver(&scl200wdt_pnp_driver);
-#endif
- goto out_clean;
-}
-
-
-static void __exit sc1200wdt_exit(void)
-{
- misc_deregister(&sc1200wdt_miscdev);
- unregister_reboot_notifier(&sc1200wdt_notifier);
-
-#if defined CONFIG_PNP
- if(isapnp)
- pnp_unregister_driver(&scl200wdt_pnp_driver);
- else
-#endif
- release_region(io, io_len);
-}
-
-module_init(sc1200wdt_init);
-module_exit(sc1200wdt_exit);
-
-MODULE_AUTHOR("Zwane Mwaikambo <zwane@commfireservices.com>");
-MODULE_DESCRIPTION("Driver for National Semiconductor PC87307/PC97307 watchdog component");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);