watchdog: f71808e_wdt: new watchdog driver for Fintek F71808E and F71882FG
Add a new watchdog driver for the Fintek F71808E and F71882FG Super I/O controllers. Signed-off-by: Giel van Schijndel <me@mortis.eu> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Giel van Schijndel
Wim Van Sebroeck
Родитель
4c4b638e37
Коммит
96cb4eb019
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@ -401,6 +401,17 @@ config ALIM7101_WDT
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Most people will say N.
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config F71808E_WDT
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tristate "Fintek F71808E and F71882FG Watchdog"
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depends on X86 && EXPERIMENTAL
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help
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This is the driver for the hardware watchdog on the Fintek
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F71808E and F71882FG Super I/O controllers.
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You can compile this driver directly into the kernel, or use
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it as a module. The module will be called f71808e_wdt.
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config GEODE_WDT
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tristate "AMD Geode CS5535/CS5536 Watchdog"
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depends on CS5535_MFGPT
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@ -66,6 +66,7 @@ obj-$(CONFIG_ACQUIRE_WDT) += acquirewdt.o
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obj-$(CONFIG_ADVANTECH_WDT) += advantechwdt.o
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obj-$(CONFIG_ALIM1535_WDT) += alim1535_wdt.o
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obj-$(CONFIG_ALIM7101_WDT) += alim7101_wdt.o
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obj-$(CONFIG_F71808E_WDT) += f71808e_wdt.o
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obj-$(CONFIG_GEODE_WDT) += geodewdt.o
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obj-$(CONFIG_SC520_WDT) += sc520_wdt.o
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obj-$(CONFIG_SBC_FITPC2_WATCHDOG) += sbc_fitpc2_wdt.o
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@ -0,0 +1,768 @@
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/***************************************************************************
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* Copyright (C) 2006 by Hans Edgington <hans@edgington.nl> *
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* Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com> *
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* Copyright (C) 2010 Giel van Schijndel <me@mortis.eu> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#define DRVNAME "f71808e_wdt"
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#define SIO_F71808FG_LD_WDT 0x07 /* Watchdog timer logical device */
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#define SIO_UNLOCK_KEY 0x87 /* Key to enable Super-I/O */
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#define SIO_LOCK_KEY 0xAA /* Key to diasble Super-I/O */
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#define SIO_REG_LDSEL 0x07 /* Logical device select */
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#define SIO_REG_DEVID 0x20 /* Device ID (2 bytes) */
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#define SIO_REG_DEVREV 0x22 /* Device revision */
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#define SIO_REG_MANID 0x23 /* Fintek ID (2 bytes) */
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#define SIO_REG_ENABLE 0x30 /* Logical device enable */
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#define SIO_REG_ADDR 0x60 /* Logical device address (2 bytes) */
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#define SIO_FINTEK_ID 0x1934 /* Manufacturers ID */
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#define SIO_F71808_ID 0x0901 /* Chipset ID */
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#define SIO_F71858_ID 0x0507 /* Chipset ID */
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#define SIO_F71862_ID 0x0601 /* Chipset ID */
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#define SIO_F71882_ID 0x0541 /* Chipset ID */
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#define SIO_F71889_ID 0x0723 /* Chipset ID */
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#define F71882FG_REG_START 0x01
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#define F71808FG_REG_WDO_CONF 0xf0
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#define F71808FG_REG_WDT_CONF 0xf5
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#define F71808FG_REG_WD_TIME 0xf6
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#define F71808FG_FLAG_WDOUT_EN 7
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#define F71808FG_FLAG_WDTMOUT_STS 5
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#define F71808FG_FLAG_WD_EN 5
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#define F71808FG_FLAG_WD_PULSE 4
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#define F71808FG_FLAG_WD_UNIT 3
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/* Default values */
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#define WATCHDOG_TIMEOUT 60 /* 1 minute default timeout */
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#define WATCHDOG_MAX_TIMEOUT (60 * 255)
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#define WATCHDOG_PULSE_WIDTH 125 /* 125 ms, default pulse width for
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watchdog signal */
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static unsigned short force_id;
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module_param(force_id, ushort, 0);
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MODULE_PARM_DESC(force_id, "Override the detected device ID");
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static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
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static int timeout = 60; /* default timeout in seconds */
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in seconds. 1<= timeout <="
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__MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
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static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
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module_param(pulse_width, uint, 0);
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MODULE_PARM_DESC(pulse_width,
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"Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
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" (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0444);
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MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
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static unsigned int start_withtimeout;
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module_param(start_withtimeout, uint, 0);
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MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
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" given initial timeout. Zero (default) disables this feature.");
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enum chips { f71808fg, f71858fg, f71862fg, f71882fg, f71889fg };
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static const char *f71808e_names[] = {
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"f71808fg",
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"f71858fg",
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"f71862fg",
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"f71882fg",
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"f71889fg",
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};
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/* Super-I/O Function prototypes */
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static inline int superio_inb(int base, int reg);
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static inline int superio_inw(int base, int reg);
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static inline void superio_outb(int base, int reg, u8 val);
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static inline void superio_set_bit(int base, int reg, int bit);
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static inline void superio_clear_bit(int base, int reg, int bit);
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static inline int superio_enter(int base);
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static inline void superio_select(int base, int ld);
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static inline void superio_exit(int base);
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struct watchdog_data {
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unsigned short sioaddr;
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enum chips type;
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unsigned long opened;
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struct mutex lock;
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char expect_close;
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struct watchdog_info ident;
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unsigned short timeout;
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u8 timer_val; /* content for the wd_time register */
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char minutes_mode;
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u8 pulse_val; /* pulse width flag */
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char pulse_mode; /* enable pulse output mode? */
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char caused_reboot; /* last reboot was by the watchdog */
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};
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static struct watchdog_data watchdog = {
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.lock = __MUTEX_INITIALIZER(watchdog.lock),
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};
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/* Super I/O functions */
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static inline int superio_inb(int base, int reg)
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{
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outb(reg, base);
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return inb(base + 1);
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}
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static int superio_inw(int base, int reg)
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{
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int val;
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val = superio_inb(base, reg) << 8;
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val |= superio_inb(base, reg + 1);
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return val;
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}
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static inline void superio_outb(int base, int reg, u8 val)
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{
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outb(reg, base);
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outb(val, base + 1);
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}
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static inline void superio_set_bit(int base, int reg, int bit)
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{
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unsigned long val = superio_inb(base, reg);
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__set_bit(bit, &val);
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superio_outb(base, reg, val);
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}
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static inline void superio_clear_bit(int base, int reg, int bit)
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{
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unsigned long val = superio_inb(base, reg);
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__clear_bit(bit, &val);
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superio_outb(base, reg, val);
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}
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static inline int superio_enter(int base)
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{
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/* Don't step on other drivers' I/O space by accident */
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if (!request_muxed_region(base, 2, DRVNAME)) {
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printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
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(int)base);
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return -EBUSY;
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}
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/* according to the datasheet the key must be send twice! */
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outb(SIO_UNLOCK_KEY, base);
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outb(SIO_UNLOCK_KEY, base);
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return 0;
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}
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static inline void superio_select(int base, int ld)
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{
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outb(SIO_REG_LDSEL, base);
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outb(ld, base + 1);
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}
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static inline void superio_exit(int base)
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{
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outb(SIO_LOCK_KEY, base);
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release_region(base, 2);
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}
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static int watchdog_set_timeout(int timeout)
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{
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if (timeout <= 0
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|| timeout > max_timeout) {
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printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n");
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return -EINVAL;
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}
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mutex_lock(&watchdog.lock);
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watchdog.timeout = timeout;
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if (timeout > 0xff) {
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watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
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watchdog.minutes_mode = true;
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} else {
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watchdog.timer_val = timeout;
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watchdog.minutes_mode = false;
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}
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mutex_unlock(&watchdog.lock);
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return 0;
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}
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static int watchdog_set_pulse_width(unsigned int pw)
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{
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int err = 0;
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mutex_lock(&watchdog.lock);
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if (pw <= 1) {
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watchdog.pulse_val = 0;
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} else if (pw <= 25) {
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watchdog.pulse_val = 1;
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} else if (pw <= 125) {
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watchdog.pulse_val = 2;
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} else if (pw <= 5000) {
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watchdog.pulse_val = 3;
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} else {
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printk(KERN_ERR DRVNAME ": pulse width out of range\n");
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err = -EINVAL;
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goto exit_unlock;
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}
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watchdog.pulse_mode = pw;
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exit_unlock:
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mutex_unlock(&watchdog.lock);
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return err;
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}
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static int watchdog_keepalive(void)
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{
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int err = 0;
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mutex_lock(&watchdog.lock);
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err = superio_enter(watchdog.sioaddr);
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if (err)
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goto exit_unlock;
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superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
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if (watchdog.minutes_mode)
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/* select minutes for timer units */
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superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
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F71808FG_FLAG_WD_UNIT);
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else
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/* select seconds for timer units */
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superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
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F71808FG_FLAG_WD_UNIT);
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/* Set timer value */
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superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
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watchdog.timer_val);
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superio_exit(watchdog.sioaddr);
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exit_unlock:
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mutex_unlock(&watchdog.lock);
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return err;
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}
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static int watchdog_start(void)
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{
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/* Make sure we don't die as soon as the watchdog is enabled below */
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int err = watchdog_keepalive();
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if (err)
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return err;
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mutex_lock(&watchdog.lock);
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err = superio_enter(watchdog.sioaddr);
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if (err)
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goto exit_unlock;
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superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
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/* Watchdog pin configuration */
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switch (watchdog.type) {
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case f71808fg:
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/* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
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superio_clear_bit(watchdog.sioaddr, 0x2a, 3);
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||||
superio_clear_bit(watchdog.sioaddr, 0x2b, 3);
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break;
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case f71882fg:
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/* Set pin 56 to WDTRST# */
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superio_set_bit(watchdog.sioaddr, 0x29, 1);
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break;
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default:
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/*
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* 'default' label to shut up the compiler and catch
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* programmer errors
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*/
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err = -ENODEV;
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goto exit_superio;
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||||
}
|
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|
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superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
|
||||
superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
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||||
superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
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F71808FG_FLAG_WDOUT_EN);
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|
||||
superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
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F71808FG_FLAG_WD_EN);
|
||||
|
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if (watchdog.pulse_mode) {
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||||
/* Select "pulse" output mode with given duration */
|
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u8 wdt_conf = superio_inb(watchdog.sioaddr,
|
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F71808FG_REG_WDT_CONF);
|
||||
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/* Set WD_PSWIDTH bits (1:0) */
|
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wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
|
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/* Set WD_PULSE to "pulse" mode */
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wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
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superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
|
||||
wdt_conf);
|
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} else {
|
||||
/* Select "level" output mode */
|
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superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
|
||||
F71808FG_FLAG_WD_PULSE);
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}
|
||||
|
||||
exit_superio:
|
||||
superio_exit(watchdog.sioaddr);
|
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exit_unlock:
|
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mutex_unlock(&watchdog.lock);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int watchdog_stop(void)
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{
|
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int err = 0;
|
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|
||||
mutex_lock(&watchdog.lock);
|
||||
err = superio_enter(watchdog.sioaddr);
|
||||
if (err)
|
||||
goto exit_unlock;
|
||||
superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
|
||||
|
||||
superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
|
||||
F71808FG_FLAG_WD_EN);
|
||||
|
||||
superio_exit(watchdog.sioaddr);
|
||||
|
||||
exit_unlock:
|
||||
mutex_unlock(&watchdog.lock);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int watchdog_get_status(void)
|
||||
{
|
||||
int status = 0;
|
||||
|
||||
mutex_lock(&watchdog.lock);
|
||||
status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
|
||||
mutex_unlock(&watchdog.lock);
|
||||
|
||||
return status;
|
||||
}
|
||||
|
||||
static bool watchdog_is_running(void)
|
||||
{
|
||||
/*
|
||||
* if we fail to determine the watchdog's status assume it to be
|
||||
* running to be on the safe side
|
||||
*/
|
||||
bool is_running = true;
|
||||
|
||||
mutex_lock(&watchdog.lock);
|
||||
if (superio_enter(watchdog.sioaddr))
|
||||
goto exit_unlock;
|
||||
superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
|
||||
|
||||
is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
|
||||
&& (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
|
||||
& F71808FG_FLAG_WD_EN);
|
||||
|
||||
superio_exit(watchdog.sioaddr);
|
||||
|
||||
exit_unlock:
|
||||
mutex_unlock(&watchdog.lock);
|
||||
return is_running;
|
||||
}
|
||||
|
||||
/* /dev/watchdog api */
|
||||
|
||||
static int watchdog_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
int err;
|
||||
|
||||
/* If the watchdog is alive we don't need to start it again */
|
||||
if (test_and_set_bit(0, &watchdog.opened))
|
||||
return -EBUSY;
|
||||
|
||||
err = watchdog_start();
|
||||
if (err) {
|
||||
clear_bit(0, &watchdog.opened);
|
||||
return err;
|
||||
}
|
||||
|
||||
if (nowayout)
|
||||
__module_get(THIS_MODULE);
|
||||
|
||||
watchdog.expect_close = 0;
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int watchdog_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
clear_bit(0, &watchdog.opened);
|
||||
|
||||
if (!watchdog.expect_close) {
|
||||
watchdog_keepalive();
|
||||
printk(KERN_CRIT DRVNAME
|
||||
": Unexpected close, not stopping watchdog!\n");
|
||||
} else if (!nowayout) {
|
||||
watchdog_stop();
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* watchdog_write:
|
||||
* @file: file handle to the watchdog
|
||||
* @buf: buffer to write
|
||||
* @count: count of bytes
|
||||
* @ppos: pointer to the position to write. No seeks allowed
|
||||
*
|
||||
* A write to a watchdog device is defined as a keepalive signal. Any
|
||||
* write of data will do, as we we don't define content meaning.
|
||||
*/
|
||||
|
||||
static ssize_t watchdog_write(struct file *file, const char __user *buf,
|
||||
size_t count, loff_t *ppos)
|
||||
{
|
||||
if (count) {
|
||||
if (!nowayout) {
|
||||
size_t i;
|
||||
|
||||
/* In case it was set long ago */
|
||||
bool expect_close = false;
|
||||
|
||||
for (i = 0; i != count; i++) {
|
||||
char c;
|
||||
if (get_user(c, buf + i))
|
||||
return -EFAULT;
|
||||
expect_close = (c == 'V');
|
||||
}
|
||||
|
||||
/* Properly order writes across fork()ed processes */
|
||||
mutex_lock(&watchdog.lock);
|
||||
watchdog.expect_close = expect_close;
|
||||
mutex_unlock(&watchdog.lock);
|
||||
}
|
||||
|
||||
/* someone wrote to us, we should restart timer */
|
||||
watchdog_keepalive();
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
/*
|
||||
* watchdog_ioctl:
|
||||
* @inode: inode of the device
|
||||
* @file: file handle to the device
|
||||
* @cmd: watchdog command
|
||||
* @arg: argument pointer
|
||||
*
|
||||
* The watchdog API defines a common set of functions for all watchdogs
|
||||
* according to their available features.
|
||||
*/
|
||||
static long watchdog_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
int status;
|
||||
int new_options;
|
||||
int new_timeout;
|
||||
union {
|
||||
struct watchdog_info __user *ident;
|
||||
int __user *i;
|
||||
} uarg;
|
||||
|
||||
uarg.i = (int __user *)arg;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
return copy_to_user(uarg.ident, &watchdog.ident,
|
||||
sizeof(watchdog.ident)) ? -EFAULT : 0;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
status = watchdog_get_status();
|
||||
if (status < 0)
|
||||
return status;
|
||||
return put_user(status, uarg.i);
|
||||
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
return put_user(0, uarg.i);
|
||||
|
||||
case WDIOC_SETOPTIONS:
|
||||
if (get_user(new_options, uarg.i))
|
||||
return -EFAULT;
|
||||
|
||||
if (new_options & WDIOS_DISABLECARD)
|
||||
watchdog_stop();
|
||||
|
||||
if (new_options & WDIOS_ENABLECARD)
|
||||
return watchdog_start();
|
||||
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
watchdog_keepalive();
|
||||
return 0;
|
||||
|
||||
case WDIOC_SETTIMEOUT:
|
||||
if (get_user(new_timeout, uarg.i))
|
||||
return -EFAULT;
|
||||
|
||||
if (watchdog_set_timeout(new_timeout))
|
||||
return -EINVAL;
|
||||
|
||||
watchdog_keepalive();
|
||||
/* Fall */
|
||||
|
||||
case WDIOC_GETTIMEOUT:
|
||||
return put_user(watchdog.timeout, uarg.i);
|
||||
|
||||
default:
|
||||
return -ENOTTY;
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
|
||||
void *unused)
|
||||
{
|
||||
if (code == SYS_DOWN || code == SYS_HALT)
|
||||
watchdog_stop();
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
static const struct file_operations watchdog_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.open = watchdog_open,
|
||||
.release = watchdog_release,
|
||||
.write = watchdog_write,
|
||||
.unlocked_ioctl = watchdog_ioctl,
|
||||
};
|
||||
|
||||
static struct miscdevice watchdog_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &watchdog_fops,
|
||||
};
|
||||
|
||||
static struct notifier_block watchdog_notifier = {
|
||||
.notifier_call = watchdog_notify_sys,
|
||||
};
|
||||
|
||||
static int __init watchdog_init(int sioaddr)
|
||||
{
|
||||
int wdt_conf, err = 0;
|
||||
|
||||
/* No need to lock watchdog.lock here because no entry points
|
||||
* into the module have been registered yet.
|
||||
*/
|
||||
watchdog.sioaddr = sioaddr;
|
||||
watchdog.ident.options = WDIOC_SETTIMEOUT
|
||||
| WDIOF_MAGICCLOSE
|
||||
| WDIOF_KEEPALIVEPING;
|
||||
|
||||
snprintf(watchdog.ident.identity,
|
||||
sizeof(watchdog.ident.identity), "%s watchdog",
|
||||
f71808e_names[watchdog.type]);
|
||||
|
||||
err = superio_enter(sioaddr);
|
||||
if (err)
|
||||
return err;
|
||||
superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
|
||||
|
||||
wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
|
||||
watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
|
||||
|
||||
superio_exit(sioaddr);
|
||||
|
||||
err = watchdog_set_timeout(timeout);
|
||||
if (err)
|
||||
return err;
|
||||
err = watchdog_set_pulse_width(pulse_width);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = register_reboot_notifier(&watchdog_notifier);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
err = misc_register(&watchdog_miscdev);
|
||||
if (err) {
|
||||
printk(KERN_ERR DRVNAME
|
||||
": cannot register miscdev on minor=%d\n",
|
||||
watchdog_miscdev.minor);
|
||||
goto exit_reboot;
|
||||
}
|
||||
|
||||
if (start_withtimeout) {
|
||||
if (start_withtimeout <= 0
|
||||
|| start_withtimeout > max_timeout) {
|
||||
printk(KERN_ERR DRVNAME
|
||||
": starting timeout out of range\n");
|
||||
err = -EINVAL;
|
||||
goto exit_miscdev;
|
||||
}
|
||||
|
||||
err = watchdog_start();
|
||||
if (err) {
|
||||
printk(KERN_ERR DRVNAME
|
||||
": cannot start watchdog timer\n");
|
||||
goto exit_miscdev;
|
||||
}
|
||||
|
||||
mutex_lock(&watchdog.lock);
|
||||
err = superio_enter(sioaddr);
|
||||
if (err)
|
||||
goto exit_unlock;
|
||||
superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
|
||||
|
||||
if (start_withtimeout > 0xff) {
|
||||
/* select minutes for timer units */
|
||||
superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
|
||||
F71808FG_FLAG_WD_UNIT);
|
||||
superio_outb(sioaddr, F71808FG_REG_WD_TIME,
|
||||
DIV_ROUND_UP(start_withtimeout, 60));
|
||||
} else {
|
||||
/* select seconds for timer units */
|
||||
superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
|
||||
F71808FG_FLAG_WD_UNIT);
|
||||
superio_outb(sioaddr, F71808FG_REG_WD_TIME,
|
||||
start_withtimeout);
|
||||
}
|
||||
|
||||
superio_exit(sioaddr);
|
||||
mutex_unlock(&watchdog.lock);
|
||||
|
||||
if (nowayout)
|
||||
__module_get(THIS_MODULE);
|
||||
|
||||
printk(KERN_INFO DRVNAME
|
||||
": watchdog started with initial timeout of %u sec\n",
|
||||
start_withtimeout);
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
exit_unlock:
|
||||
mutex_unlock(&watchdog.lock);
|
||||
exit_miscdev:
|
||||
misc_deregister(&watchdog_miscdev);
|
||||
exit_reboot:
|
||||
unregister_reboot_notifier(&watchdog_notifier);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __init f71808e_find(int sioaddr)
|
||||
{
|
||||
u16 devid;
|
||||
int err = superio_enter(sioaddr);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
devid = superio_inw(sioaddr, SIO_REG_MANID);
|
||||
if (devid != SIO_FINTEK_ID) {
|
||||
pr_debug(DRVNAME ": Not a Fintek device\n");
|
||||
err = -ENODEV;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
|
||||
switch (devid) {
|
||||
case SIO_F71808_ID:
|
||||
watchdog.type = f71808fg;
|
||||
break;
|
||||
case SIO_F71882_ID:
|
||||
watchdog.type = f71882fg;
|
||||
break;
|
||||
case SIO_F71862_ID:
|
||||
case SIO_F71889_ID:
|
||||
/* These have a watchdog, though it isn't implemented (yet). */
|
||||
err = -ENOSYS;
|
||||
goto exit;
|
||||
case SIO_F71858_ID:
|
||||
/* Confirmed (by datasheet) not to have a watchdog. */
|
||||
err = -ENODEV;
|
||||
goto exit;
|
||||
default:
|
||||
printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",
|
||||
(unsigned int)devid);
|
||||
err = -ENODEV;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n",
|
||||
f71808e_names[watchdog.type],
|
||||
(int)superio_inb(sioaddr, SIO_REG_DEVREV));
|
||||
exit:
|
||||
superio_exit(sioaddr);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __init f71808e_init(void)
|
||||
{
|
||||
static const unsigned short addrs[] = { 0x2e, 0x4e };
|
||||
int err = -ENODEV;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(addrs); i++) {
|
||||
err = f71808e_find(addrs[i]);
|
||||
if (err == 0)
|
||||
break;
|
||||
}
|
||||
if (i == ARRAY_SIZE(addrs))
|
||||
return err;
|
||||
|
||||
return watchdog_init(addrs[i]);
|
||||
}
|
||||
|
||||
static void __exit f71808e_exit(void)
|
||||
{
|
||||
if (watchdog_is_running()) {
|
||||
printk(KERN_WARNING DRVNAME
|
||||
": Watchdog timer still running, stopping it\n");
|
||||
watchdog_stop();
|
||||
}
|
||||
misc_deregister(&watchdog_miscdev);
|
||||
unregister_reboot_notifier(&watchdog_notifier);
|
||||
}
|
||||
|
||||
MODULE_DESCRIPTION("F71808E Watchdog Driver");
|
||||
MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(f71808e_init);
|
||||
module_exit(f71808e_exit);
|
||||
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