// SPDX-License-Identifier: GPL-2.0+ /* * Berkshire PCI-PC Watchdog Card Driver * * (c) Copyright 2003-2007 Wim Van Sebroeck <[email protected]>. * * Based on source code of the following authors: * Ken Hollis <[email protected]>, * Lindsay Harris <[email protected]>, * Alan Cox <[email protected]>, * Matt Domsch <[email protected]>, * Rob Radez <[email protected]> * * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor * provide warranty for any of this software. This material is * provided "AS-IS" and at no charge. */ /* * A bells and whistles driver is available from: * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/ * * More info available at * http://www.berkprod.com/ or http://www.pcwatchdog.com/ */ /* * Includes, defines, variables, module parameters, ... */ #define pr_fmt(fmt) … #include <linux/module.h> /* For module specific items */ #include <linux/moduleparam.h> /* For new moduleparam's */ #include <linux/types.h> /* For standard types (like size_t) */ #include <linux/errno.h> /* For the -ENODEV/... values */ #include <linux/kernel.h> /* For printk/panic/... */ #include <linux/delay.h> /* For mdelay function */ #include <linux/miscdevice.h> /* For struct miscdevice */ #include <linux/watchdog.h> /* For the watchdog specific items */ #include <linux/notifier.h> /* For notifier support */ #include <linux/reboot.h> /* For reboot_notifier stuff */ #include <linux/init.h> /* For __init/__exit/... */ #include <linux/fs.h> /* For file operations */ #include <linux/pci.h> /* For pci functions */ #include <linux/ioport.h> /* For io-port access */ #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ #include <linux/io.h> /* For inb/outb/... */ /* Module and version information */ #define WATCHDOG_VERSION … #define WATCHDOG_DRIVER_NAME … #define WATCHDOG_NAME … #define DRIVER_VERSION … /* Stuff for the PCI ID's */ #ifndef PCI_VENDOR_ID_QUICKLOGIC #define PCI_VENDOR_ID_QUICKLOGIC … #endif #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD … #endif /* * These are the defines that describe the control status bits for the * PCI-PC Watchdog card. */ /* Port 1 : Control Status #1 */ #define WD_PCI_WTRP … #define WD_PCI_HRBT … #define WD_PCI_TTRP … #define WD_PCI_RL2A … #define WD_PCI_RL1A … #define WD_PCI_R2DS … #define WD_PCI_RLY2 … /* Port 2 : Control Status #2 */ #define WD_PCI_WDIS … #define WD_PCI_ENTP … #define WD_PCI_WRSP … #define WD_PCI_PCMD … /* according to documentation max. time to process a command for the pci * watchdog card is 100 ms, so we give it 150 ms to do it's job */ #define PCI_COMMAND_TIMEOUT … /* Watchdog's internal commands */ #define CMD_GET_STATUS … #define CMD_GET_FIRMWARE_VERSION … #define CMD_READ_WATCHDOG_TIMEOUT … #define CMD_WRITE_WATCHDOG_TIMEOUT … #define CMD_GET_CLEAR_RESET_COUNT … /* Watchdog's Dip Switch heartbeat values */ static const int heartbeat_tbl[] = …; /* We can only use 1 card due to the /dev/watchdog restriction */ static int cards_found; /* internal variables */ static int temp_panic; static unsigned long is_active; static char expect_release; /* this is private data for each PCI-PC watchdog card */ static struct { … } pcipcwd_private; /* module parameters */ #define QUIET … #define VERBOSE … #define DEBUG … static int debug = …; module_param(debug, int, 0); MODULE_PARM_DESC(…) …; #define WATCHDOG_HEARTBEAT … static int heartbeat = …; module_param(heartbeat, int, 0); MODULE_PARM_DESC(…) …; static bool nowayout = … WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); MODULE_PARM_DESC(…) …; /* * Internal functions */ static int send_command(int cmd, int *msb, int *lsb) { … } static inline void pcipcwd_check_temperature_support(void) { … } static int pcipcwd_get_option_switches(void) { … } static void pcipcwd_show_card_info(void) { … } static int pcipcwd_start(void) { … } static int pcipcwd_stop(void) { … } static int pcipcwd_keepalive(void) { … } static int pcipcwd_set_heartbeat(int t) { … } static int pcipcwd_get_status(int *status) { … } static int pcipcwd_clear_status(void) { … } static int pcipcwd_get_temperature(int *temperature) { … } static int pcipcwd_get_timeleft(int *time_left) { … } /* * /dev/watchdog handling */ static ssize_t pcipcwd_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { … } static long pcipcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } static int pcipcwd_open(struct inode *inode, struct file *file) { … } static int pcipcwd_release(struct inode *inode, struct file *file) { … } /* * /dev/temperature handling */ static ssize_t pcipcwd_temp_read(struct file *file, char __user *data, size_t len, loff_t *ppos) { … } static int pcipcwd_temp_open(struct inode *inode, struct file *file) { … } static int pcipcwd_temp_release(struct inode *inode, struct file *file) { … } /* * Notify system */ static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { … } /* * Kernel Interfaces */ static const struct file_operations pcipcwd_fops = …; static struct miscdevice pcipcwd_miscdev = …; static const struct file_operations pcipcwd_temp_fops = …; static struct miscdevice pcipcwd_temp_miscdev = …; static struct notifier_block pcipcwd_notifier = …; /* * Init & exit routines */ static int pcipcwd_card_init(struct pci_dev *pdev, const struct pci_device_id *ent) { … } static void pcipcwd_card_exit(struct pci_dev *pdev) { … } static const struct pci_device_id pcipcwd_pci_tbl[] = …; MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); static struct pci_driver pcipcwd_driver = …; module_pci_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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