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819 lines
20 KiB
819 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Berkshire PCI-PC Watchdog Card Driver |
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* |
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* (c) Copyright 2003-2007 Wim Van Sebroeck <[email protected]>. |
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* |
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* Based on source code of the following authors: |
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* Ken Hollis <[email protected]>, |
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* Lindsay Harris <[email protected]>, |
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* Alan Cox <[email protected]>, |
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* Matt Domsch <[email protected]>, |
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* Rob Radez <[email protected]> |
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* |
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* Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor |
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* provide warranty for any of this software. This material is |
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* provided "AS-IS" and at no charge. |
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*/ |
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|
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/* |
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* A bells and whistles driver is available from: |
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* http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/ |
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* |
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* More info available at |
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* http://www.berkprod.com/ or http://www.pcwatchdog.com/ |
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*/ |
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|
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/* |
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* Includes, defines, variables, module parameters, ... |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/module.h> /* For module specific items */ |
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#include <linux/moduleparam.h> /* For new moduleparam's */ |
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#include <linux/types.h> /* For standard types (like size_t) */ |
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#include <linux/errno.h> /* For the -ENODEV/... values */ |
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#include <linux/kernel.h> /* For printk/panic/... */ |
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#include <linux/delay.h> /* For mdelay function */ |
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#include <linux/miscdevice.h> /* For struct miscdevice */ |
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#include <linux/watchdog.h> /* For the watchdog specific items */ |
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#include <linux/notifier.h> /* For notifier support */ |
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#include <linux/reboot.h> /* For reboot_notifier stuff */ |
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#include <linux/init.h> /* For __init/__exit/... */ |
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#include <linux/fs.h> /* For file operations */ |
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#include <linux/pci.h> /* For pci functions */ |
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#include <linux/ioport.h> /* For io-port access */ |
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#include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ |
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#include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
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#include <linux/io.h> /* For inb/outb/... */ |
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|
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/* Module and version information */ |
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#define WATCHDOG_VERSION "1.03" |
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#define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog" |
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#define WATCHDOG_NAME "pcwd_pci" |
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#define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION |
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|
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/* Stuff for the PCI ID's */ |
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#ifndef PCI_VENDOR_ID_QUICKLOGIC |
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#define PCI_VENDOR_ID_QUICKLOGIC 0x11e3 |
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#endif |
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#ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD |
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#define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030 |
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#endif |
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|
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/* |
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* These are the defines that describe the control status bits for the |
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* PCI-PC Watchdog card. |
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*/ |
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/* Port 1 : Control Status #1 */ |
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#define WD_PCI_WTRP 0x01 /* Watchdog Trip status */ |
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#define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */ |
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#define WD_PCI_TTRP 0x04 /* Temperature Trip status */ |
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#define WD_PCI_RL2A 0x08 /* Relay 2 Active */ |
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#define WD_PCI_RL1A 0x10 /* Relay 1 Active */ |
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#define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip / |
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reset */ |
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#define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */ |
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/* Port 2 : Control Status #2 */ |
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#define WD_PCI_WDIS 0x10 /* Watchdog Disable */ |
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#define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */ |
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#define WD_PCI_WRSP 0x40 /* Watchdog wrote response */ |
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#define WD_PCI_PCMD 0x80 /* PC has sent command */ |
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|
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/* according to documentation max. time to process a command for the pci |
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* watchdog card is 100 ms, so we give it 150 ms to do it's job */ |
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#define PCI_COMMAND_TIMEOUT 150 |
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|
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/* Watchdog's internal commands */ |
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#define CMD_GET_STATUS 0x04 |
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#define CMD_GET_FIRMWARE_VERSION 0x08 |
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#define CMD_READ_WATCHDOG_TIMEOUT 0x18 |
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#define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 |
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#define CMD_GET_CLEAR_RESET_COUNT 0x84 |
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|
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/* Watchdog's Dip Switch heartbeat values */ |
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static const int heartbeat_tbl[] = { |
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5, /* OFF-OFF-OFF = 5 Sec */ |
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10, /* OFF-OFF-ON = 10 Sec */ |
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30, /* OFF-ON-OFF = 30 Sec */ |
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60, /* OFF-ON-ON = 1 Min */ |
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300, /* ON-OFF-OFF = 5 Min */ |
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600, /* ON-OFF-ON = 10 Min */ |
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1800, /* ON-ON-OFF = 30 Min */ |
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3600, /* ON-ON-ON = 1 hour */ |
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}; |
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|
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/* We can only use 1 card due to the /dev/watchdog restriction */ |
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static int cards_found; |
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|
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/* internal variables */ |
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static int temp_panic; |
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static unsigned long is_active; |
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static char expect_release; |
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/* this is private data for each PCI-PC watchdog card */ |
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static struct { |
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/* Wether or not the card has a temperature device */ |
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int supports_temp; |
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/* The card's boot status */ |
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int boot_status; |
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/* The cards I/O address */ |
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unsigned long io_addr; |
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/* the lock for io operations */ |
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spinlock_t io_lock; |
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/* the PCI-device */ |
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struct pci_dev *pdev; |
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} pcipcwd_private; |
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|
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/* module parameters */ |
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#define QUIET 0 /* Default */ |
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#define VERBOSE 1 /* Verbose */ |
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#define DEBUG 2 /* print fancy stuff too */ |
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static int debug = QUIET; |
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module_param(debug, int, 0); |
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MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); |
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#define WATCHDOG_HEARTBEAT 0 /* default heartbeat = |
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delay-time from dip-switches */ |
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static int heartbeat = WATCHDOG_HEARTBEAT; |
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module_param(heartbeat, int, 0); |
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " |
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"(0<heartbeat<65536 or 0=delay-time from dip-switches, default=" |
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__MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, bool, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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|
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/* |
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* Internal functions |
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*/ |
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static int send_command(int cmd, int *msb, int *lsb) |
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{ |
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int got_response, count; |
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if (debug >= DEBUG) |
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pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n", |
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cmd, *msb, *lsb); |
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spin_lock(&pcipcwd_private.io_lock); |
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/* If a command requires data it should be written first. |
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* Data for commands with 8 bits of data should be written to port 4. |
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* Commands with 16 bits of data, should be written as LSB to port 4 |
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* and MSB to port 5. |
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* After the required data has been written then write the command to |
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* port 6. */ |
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outb_p(*lsb, pcipcwd_private.io_addr + 4); |
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outb_p(*msb, pcipcwd_private.io_addr + 5); |
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outb_p(cmd, pcipcwd_private.io_addr + 6); |
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|
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/* wait till the pci card processed the command, signaled by |
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* the WRSP bit in port 2 and give it a max. timeout of |
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* PCI_COMMAND_TIMEOUT to process */ |
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got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
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for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); |
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count++) { |
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mdelay(1); |
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got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
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} |
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if (debug >= DEBUG) { |
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if (got_response) { |
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pr_debug("time to process command was: %d ms\n", |
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count); |
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} else { |
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pr_debug("card did not respond on command!\n"); |
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} |
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} |
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if (got_response) { |
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/* read back response */ |
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*lsb = inb_p(pcipcwd_private.io_addr + 4); |
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*msb = inb_p(pcipcwd_private.io_addr + 5); |
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/* clear WRSP bit */ |
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inb_p(pcipcwd_private.io_addr + 6); |
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if (debug >= DEBUG) |
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pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n", |
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cmd, *msb, *lsb); |
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} |
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spin_unlock(&pcipcwd_private.io_lock); |
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return got_response; |
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} |
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static inline void pcipcwd_check_temperature_support(void) |
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{ |
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if (inb_p(pcipcwd_private.io_addr) != 0xF0) |
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pcipcwd_private.supports_temp = 1; |
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} |
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static int pcipcwd_get_option_switches(void) |
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{ |
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int option_switches; |
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option_switches = inb_p(pcipcwd_private.io_addr + 3); |
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return option_switches; |
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} |
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static void pcipcwd_show_card_info(void) |
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{ |
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int got_fw_rev, fw_rev_major, fw_rev_minor; |
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char fw_ver_str[20]; /* The cards firmware version */ |
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int option_switches; |
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got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, |
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&fw_rev_minor); |
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if (got_fw_rev) |
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sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); |
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else |
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sprintf(fw_ver_str, "<card no answer>"); |
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/* Get switch settings */ |
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option_switches = pcipcwd_get_option_switches(); |
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pr_info("Found card at port 0x%04x (Firmware: %s) %s temp option\n", |
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(int) pcipcwd_private.io_addr, fw_ver_str, |
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(pcipcwd_private.supports_temp ? "with" : "without")); |
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pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", |
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option_switches, |
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((option_switches & 0x10) ? "ON" : "OFF"), |
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((option_switches & 0x08) ? "ON" : "OFF")); |
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if (pcipcwd_private.boot_status & WDIOF_CARDRESET) |
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pr_info("Previous reset was caused by the Watchdog card\n"); |
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if (pcipcwd_private.boot_status & WDIOF_OVERHEAT) |
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pr_info("Card sensed a CPU Overheat\n"); |
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if (pcipcwd_private.boot_status == 0) |
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pr_info("No previous trip detected - Cold boot or reset\n"); |
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} |
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static int pcipcwd_start(void) |
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{ |
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int stat_reg; |
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spin_lock(&pcipcwd_private.io_lock); |
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outb_p(0x00, pcipcwd_private.io_addr + 3); |
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udelay(1000); |
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stat_reg = inb_p(pcipcwd_private.io_addr + 2); |
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spin_unlock(&pcipcwd_private.io_lock); |
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if (stat_reg & WD_PCI_WDIS) { |
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pr_err("Card timer not enabled\n"); |
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return -1; |
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} |
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if (debug >= VERBOSE) |
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pr_debug("Watchdog started\n"); |
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return 0; |
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} |
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static int pcipcwd_stop(void) |
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{ |
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int stat_reg; |
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spin_lock(&pcipcwd_private.io_lock); |
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outb_p(0xA5, pcipcwd_private.io_addr + 3); |
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udelay(1000); |
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outb_p(0xA5, pcipcwd_private.io_addr + 3); |
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udelay(1000); |
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stat_reg = inb_p(pcipcwd_private.io_addr + 2); |
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spin_unlock(&pcipcwd_private.io_lock); |
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if (!(stat_reg & WD_PCI_WDIS)) { |
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pr_err("Card did not acknowledge disable attempt\n"); |
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return -1; |
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} |
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if (debug >= VERBOSE) |
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pr_debug("Watchdog stopped\n"); |
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return 0; |
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} |
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static int pcipcwd_keepalive(void) |
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{ |
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/* Re-trigger watchdog by writing to port 0 */ |
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spin_lock(&pcipcwd_private.io_lock); |
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outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */ |
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spin_unlock(&pcipcwd_private.io_lock); |
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if (debug >= DEBUG) |
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pr_debug("Watchdog keepalive signal send\n"); |
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return 0; |
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} |
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static int pcipcwd_set_heartbeat(int t) |
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{ |
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int t_msb = t / 256; |
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int t_lsb = t % 256; |
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if ((t < 0x0001) || (t > 0xFFFF)) |
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return -EINVAL; |
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|
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/* Write new heartbeat to watchdog */ |
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send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb); |
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heartbeat = t; |
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if (debug >= VERBOSE) |
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pr_debug("New heartbeat: %d\n", heartbeat); |
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return 0; |
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} |
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static int pcipcwd_get_status(int *status) |
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{ |
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int control_status; |
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*status = 0; |
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control_status = inb_p(pcipcwd_private.io_addr + 1); |
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if (control_status & WD_PCI_WTRP) |
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*status |= WDIOF_CARDRESET; |
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if (control_status & WD_PCI_TTRP) { |
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*status |= WDIOF_OVERHEAT; |
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if (temp_panic) |
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panic(KBUILD_MODNAME ": Temperature overheat trip!\n"); |
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} |
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if (debug >= DEBUG) |
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pr_debug("Control Status #1: 0x%02x\n", control_status); |
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return 0; |
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} |
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static int pcipcwd_clear_status(void) |
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{ |
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int control_status; |
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int msb; |
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int reset_counter; |
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|
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if (debug >= VERBOSE) |
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pr_info("clearing watchdog trip status & LED\n"); |
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control_status = inb_p(pcipcwd_private.io_addr + 1); |
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if (debug >= DEBUG) { |
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pr_debug("status was: 0x%02x\n", control_status); |
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pr_debug("sending: 0x%02x\n", |
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(control_status & WD_PCI_R2DS) | WD_PCI_WTRP); |
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} |
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|
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/* clear trip status & LED and keep mode of relay 2 */ |
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outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, |
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pcipcwd_private.io_addr + 1); |
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|
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/* clear reset counter */ |
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msb = 0; |
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reset_counter = 0xff; |
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send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter); |
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if (debug >= DEBUG) { |
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pr_debug("reset count was: 0x%02x\n", reset_counter); |
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} |
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return 0; |
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} |
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static int pcipcwd_get_temperature(int *temperature) |
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{ |
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*temperature = 0; |
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if (!pcipcwd_private.supports_temp) |
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return -ENODEV; |
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|
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spin_lock(&pcipcwd_private.io_lock); |
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*temperature = inb_p(pcipcwd_private.io_addr); |
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spin_unlock(&pcipcwd_private.io_lock); |
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|
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/* |
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* Convert celsius to fahrenheit, since this was |
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* the decided 'standard' for this return value. |
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*/ |
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*temperature = (*temperature * 9 / 5) + 32; |
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|
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if (debug >= DEBUG) { |
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pr_debug("temperature is: %d F\n", *temperature); |
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} |
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return 0; |
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} |
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static int pcipcwd_get_timeleft(int *time_left) |
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{ |
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int msb; |
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int lsb; |
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|
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/* Read the time that's left before rebooting */ |
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/* Note: if the board is not yet armed then we will read 0xFFFF */ |
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send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); |
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*time_left = (msb << 8) + lsb; |
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if (debug >= VERBOSE) |
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pr_debug("Time left before next reboot: %d\n", *time_left); |
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return 0; |
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} |
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|
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/* |
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* /dev/watchdog handling |
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*/ |
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|
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static ssize_t pcipcwd_write(struct file *file, const char __user *data, |
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size_t len, loff_t *ppos) |
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{ |
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/* See if we got the magic character 'V' and reload the timer */ |
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if (len) { |
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if (!nowayout) { |
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size_t i; |
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|
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/* note: just in case someone wrote the magic character |
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* five months ago... */ |
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expect_release = 0; |
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|
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/* scan to see whether or not we got the |
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* magic character */ |
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for (i = 0; i != len; i++) { |
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char c; |
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if (get_user(c, data + i)) |
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return -EFAULT; |
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if (c == 'V') |
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expect_release = 42; |
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} |
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} |
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|
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/* someone wrote to us, we should reload the timer */ |
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pcipcwd_keepalive(); |
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} |
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return len; |
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} |
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|
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static long pcipcwd_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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void __user *argp = (void __user *)arg; |
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int __user *p = argp; |
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static const struct watchdog_info ident = { |
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.options = WDIOF_OVERHEAT | |
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WDIOF_CARDRESET | |
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WDIOF_KEEPALIVEPING | |
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WDIOF_SETTIMEOUT | |
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WDIOF_MAGICCLOSE, |
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.firmware_version = 1, |
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.identity = WATCHDOG_DRIVER_NAME, |
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}; |
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|
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switch (cmd) { |
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case WDIOC_GETSUPPORT: |
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; |
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|
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case WDIOC_GETSTATUS: |
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{ |
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int status; |
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pcipcwd_get_status(&status); |
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return put_user(status, p); |
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} |
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|
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case WDIOC_GETBOOTSTATUS: |
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return put_user(pcipcwd_private.boot_status, p); |
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|
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case WDIOC_GETTEMP: |
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{ |
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int temperature; |
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|
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if (pcipcwd_get_temperature(&temperature)) |
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return -EFAULT; |
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|
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return put_user(temperature, p); |
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} |
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|
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case WDIOC_SETOPTIONS: |
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{ |
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int new_options, retval = -EINVAL; |
|
|
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if (get_user(new_options, p)) |
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return -EFAULT; |
|
|
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if (new_options & WDIOS_DISABLECARD) { |
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if (pcipcwd_stop()) |
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return -EIO; |
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retval = 0; |
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} |
|
|
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if (new_options & WDIOS_ENABLECARD) { |
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if (pcipcwd_start()) |
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return -EIO; |
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retval = 0; |
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} |
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|
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if (new_options & WDIOS_TEMPPANIC) { |
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temp_panic = 1; |
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retval = 0; |
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} |
|
|
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return retval; |
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} |
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|
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case WDIOC_KEEPALIVE: |
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pcipcwd_keepalive(); |
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return 0; |
|
|
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case WDIOC_SETTIMEOUT: |
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{ |
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int new_heartbeat; |
|
|
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if (get_user(new_heartbeat, p)) |
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return -EFAULT; |
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|
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if (pcipcwd_set_heartbeat(new_heartbeat)) |
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return -EINVAL; |
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|
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pcipcwd_keepalive(); |
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} |
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fallthrough; |
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|
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case WDIOC_GETTIMEOUT: |
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return put_user(heartbeat, p); |
|
|
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case WDIOC_GETTIMELEFT: |
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{ |
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int time_left; |
|
|
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if (pcipcwd_get_timeleft(&time_left)) |
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return -EFAULT; |
|
|
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return put_user(time_left, p); |
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} |
|
|
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default: |
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return -ENOTTY; |
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} |
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} |
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|
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static int pcipcwd_open(struct inode *inode, struct file *file) |
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{ |
|
/* /dev/watchdog can only be opened once */ |
|
if (test_and_set_bit(0, &is_active)) { |
|
if (debug >= VERBOSE) |
|
pr_err("Attempt to open already opened device\n"); |
|
return -EBUSY; |
|
} |
|
|
|
/* Activate */ |
|
pcipcwd_start(); |
|
pcipcwd_keepalive(); |
|
return stream_open(inode, file); |
|
} |
|
|
|
static int pcipcwd_release(struct inode *inode, struct file *file) |
|
{ |
|
/* |
|
* Shut off the timer. |
|
*/ |
|
if (expect_release == 42) { |
|
pcipcwd_stop(); |
|
} else { |
|
pr_crit("Unexpected close, not stopping watchdog!\n"); |
|
pcipcwd_keepalive(); |
|
} |
|
expect_release = 0; |
|
clear_bit(0, &is_active); |
|
return 0; |
|
} |
|
|
|
/* |
|
* /dev/temperature handling |
|
*/ |
|
|
|
static ssize_t pcipcwd_temp_read(struct file *file, char __user *data, |
|
size_t len, loff_t *ppos) |
|
{ |
|
int temperature; |
|
|
|
if (pcipcwd_get_temperature(&temperature)) |
|
return -EFAULT; |
|
|
|
if (copy_to_user(data, &temperature, 1)) |
|
return -EFAULT; |
|
|
|
return 1; |
|
} |
|
|
|
static int pcipcwd_temp_open(struct inode *inode, struct file *file) |
|
{ |
|
if (!pcipcwd_private.supports_temp) |
|
return -ENODEV; |
|
|
|
return stream_open(inode, file); |
|
} |
|
|
|
static int pcipcwd_temp_release(struct inode *inode, struct file *file) |
|
{ |
|
return 0; |
|
} |
|
|
|
/* |
|
* Notify system |
|
*/ |
|
|
|
static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, |
|
void *unused) |
|
{ |
|
if (code == SYS_DOWN || code == SYS_HALT) |
|
pcipcwd_stop(); /* Turn the WDT off */ |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
|
/* |
|
* Kernel Interfaces |
|
*/ |
|
|
|
static const struct file_operations pcipcwd_fops = { |
|
.owner = THIS_MODULE, |
|
.llseek = no_llseek, |
|
.write = pcipcwd_write, |
|
.unlocked_ioctl = pcipcwd_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.open = pcipcwd_open, |
|
.release = pcipcwd_release, |
|
}; |
|
|
|
static struct miscdevice pcipcwd_miscdev = { |
|
.minor = WATCHDOG_MINOR, |
|
.name = "watchdog", |
|
.fops = &pcipcwd_fops, |
|
}; |
|
|
|
static const struct file_operations pcipcwd_temp_fops = { |
|
.owner = THIS_MODULE, |
|
.llseek = no_llseek, |
|
.read = pcipcwd_temp_read, |
|
.open = pcipcwd_temp_open, |
|
.release = pcipcwd_temp_release, |
|
}; |
|
|
|
static struct miscdevice pcipcwd_temp_miscdev = { |
|
.minor = TEMP_MINOR, |
|
.name = "temperature", |
|
.fops = &pcipcwd_temp_fops, |
|
}; |
|
|
|
static struct notifier_block pcipcwd_notifier = { |
|
.notifier_call = pcipcwd_notify_sys, |
|
}; |
|
|
|
/* |
|
* Init & exit routines |
|
*/ |
|
|
|
static int pcipcwd_card_init(struct pci_dev *pdev, |
|
const struct pci_device_id *ent) |
|
{ |
|
int ret = -EIO; |
|
|
|
cards_found++; |
|
if (cards_found == 1) |
|
pr_info("%s\n", DRIVER_VERSION); |
|
|
|
if (cards_found > 1) { |
|
pr_err("This driver only supports 1 device\n"); |
|
return -ENODEV; |
|
} |
|
|
|
if (pci_enable_device(pdev)) { |
|
pr_err("Not possible to enable PCI Device\n"); |
|
return -ENODEV; |
|
} |
|
|
|
if (pci_resource_start(pdev, 0) == 0x0000) { |
|
pr_err("No I/O-Address for card detected\n"); |
|
ret = -ENODEV; |
|
goto err_out_disable_device; |
|
} |
|
|
|
spin_lock_init(&pcipcwd_private.io_lock); |
|
pcipcwd_private.pdev = pdev; |
|
pcipcwd_private.io_addr = pci_resource_start(pdev, 0); |
|
|
|
if (pci_request_regions(pdev, WATCHDOG_NAME)) { |
|
pr_err("I/O address 0x%04x already in use\n", |
|
(int) pcipcwd_private.io_addr); |
|
ret = -EIO; |
|
goto err_out_disable_device; |
|
} |
|
|
|
/* get the boot_status */ |
|
pcipcwd_get_status(&pcipcwd_private.boot_status); |
|
|
|
/* clear the "card caused reboot" flag */ |
|
pcipcwd_clear_status(); |
|
|
|
/* disable card */ |
|
pcipcwd_stop(); |
|
|
|
/* Check whether or not the card supports the temperature device */ |
|
pcipcwd_check_temperature_support(); |
|
|
|
/* Show info about the card itself */ |
|
pcipcwd_show_card_info(); |
|
|
|
/* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
|
if (heartbeat == 0) |
|
heartbeat = |
|
heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)]; |
|
|
|
/* Check that the heartbeat value is within it's range ; |
|
* if not reset to the default */ |
|
if (pcipcwd_set_heartbeat(heartbeat)) { |
|
pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT); |
|
pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n", |
|
WATCHDOG_HEARTBEAT); |
|
} |
|
|
|
ret = register_reboot_notifier(&pcipcwd_notifier); |
|
if (ret != 0) { |
|
pr_err("cannot register reboot notifier (err=%d)\n", ret); |
|
goto err_out_release_region; |
|
} |
|
|
|
if (pcipcwd_private.supports_temp) { |
|
ret = misc_register(&pcipcwd_temp_miscdev); |
|
if (ret != 0) { |
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
|
TEMP_MINOR, ret); |
|
goto err_out_unregister_reboot; |
|
} |
|
} |
|
|
|
ret = misc_register(&pcipcwd_miscdev); |
|
if (ret != 0) { |
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
|
WATCHDOG_MINOR, ret); |
|
goto err_out_misc_deregister; |
|
} |
|
|
|
pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
|
heartbeat, nowayout); |
|
|
|
return 0; |
|
|
|
err_out_misc_deregister: |
|
if (pcipcwd_private.supports_temp) |
|
misc_deregister(&pcipcwd_temp_miscdev); |
|
err_out_unregister_reboot: |
|
unregister_reboot_notifier(&pcipcwd_notifier); |
|
err_out_release_region: |
|
pci_release_regions(pdev); |
|
err_out_disable_device: |
|
pci_disable_device(pdev); |
|
return ret; |
|
} |
|
|
|
static void pcipcwd_card_exit(struct pci_dev *pdev) |
|
{ |
|
/* Stop the timer before we leave */ |
|
if (!nowayout) |
|
pcipcwd_stop(); |
|
|
|
/* Deregister */ |
|
misc_deregister(&pcipcwd_miscdev); |
|
if (pcipcwd_private.supports_temp) |
|
misc_deregister(&pcipcwd_temp_miscdev); |
|
unregister_reboot_notifier(&pcipcwd_notifier); |
|
pci_release_regions(pdev); |
|
pci_disable_device(pdev); |
|
cards_found--; |
|
} |
|
|
|
static const struct pci_device_id pcipcwd_pci_tbl[] = { |
|
{ PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD, |
|
PCI_ANY_ID, PCI_ANY_ID, }, |
|
{ 0 }, /* End of list */ |
|
}; |
|
MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); |
|
|
|
static struct pci_driver pcipcwd_driver = { |
|
.name = WATCHDOG_NAME, |
|
.id_table = pcipcwd_pci_tbl, |
|
.probe = pcipcwd_card_init, |
|
.remove = pcipcwd_card_exit, |
|
}; |
|
|
|
module_pci_driver(pcipcwd_driver); |
|
|
|
MODULE_AUTHOR("Wim Van Sebroeck <[email protected]>"); |
|
MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver"); |
|
MODULE_LICENSE("GPL");
|
|
|