820 lines
20 KiB
C
820 lines
20 KiB
C
// 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 <wim@iguana.be>.
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*
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* Based on source code of the following authors:
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* Ken Hollis <kenji@bitgate.com>,
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* Lindsay Harris <lindsay@bluegum.com>,
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* Alan Cox <alan@lxorguk.ukuu.org.uk>,
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* Matt Domsch <Matt_Domsch@dell.com>,
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* Rob Radez <rob@osinvestor.com>
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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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* 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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* Includes, defines, variables, module parameters, ...
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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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/* 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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/* 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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* 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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/* 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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/* 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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/* 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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/* We can only use 1 card due to the /dev/watchdog restriction */
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static int cards_found;
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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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/* 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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* 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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/* 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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/* 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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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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/* 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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/* 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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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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* 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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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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/* 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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* /dev/watchdog handling
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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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/* 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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/* 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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/* 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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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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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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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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case WDIOC_GETBOOTSTATUS:
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return put_user(pcipcwd_private.boot_status, p);
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case WDIOC_GETTEMP:
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{
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int temperature;
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|
|
if (pcipcwd_get_temperature(&temperature))
|
|
return -EFAULT;
|
|
|
|
return put_user(temperature, p);
|
|
}
|
|
|
|
case WDIOC_SETOPTIONS:
|
|
{
|
|
int new_options, retval = -EINVAL;
|
|
|
|
if (get_user(new_options, p))
|
|
return -EFAULT;
|
|
|
|
if (new_options & WDIOS_DISABLECARD) {
|
|
if (pcipcwd_stop())
|
|
return -EIO;
|
|
retval = 0;
|
|
}
|
|
|
|
if (new_options & WDIOS_ENABLECARD) {
|
|
if (pcipcwd_start())
|
|
return -EIO;
|
|
retval = 0;
|
|
}
|
|
|
|
if (new_options & WDIOS_TEMPPANIC) {
|
|
temp_panic = 1;
|
|
retval = 0;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
case WDIOC_KEEPALIVE:
|
|
pcipcwd_keepalive();
|
|
return 0;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
{
|
|
int new_heartbeat;
|
|
|
|
if (get_user(new_heartbeat, p))
|
|
return -EFAULT;
|
|
|
|
if (pcipcwd_set_heartbeat(new_heartbeat))
|
|
return -EINVAL;
|
|
|
|
pcipcwd_keepalive();
|
|
}
|
|
fallthrough;
|
|
|
|
case WDIOC_GETTIMEOUT:
|
|
return put_user(heartbeat, p);
|
|
|
|
case WDIOC_GETTIMELEFT:
|
|
{
|
|
int time_left;
|
|
|
|
if (pcipcwd_get_timeleft(&time_left))
|
|
return -EFAULT;
|
|
|
|
return put_user(time_left, p);
|
|
}
|
|
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
static int pcipcwd_open(struct inode *inode, struct file *file)
|
|
{
|
|
/* /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 <wim@iguana.be>");
|
|
MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
|
|
MODULE_LICENSE("GPL");
|