2019-05-27 06:55:02 +00:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2005-06-22 23:43:34 +00:00
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/*
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* FIXME: add wdrtas_get_status and wdrtas_get_boot_status as soon as
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* RTAS calls are available
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*/
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/*
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* RTAS watchdog driver
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*
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* (C) Copyright IBM Corp. 2005
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* device driver to exploit watchdog RTAS functions
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*
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* Authors : Utz Bacher <utz.bacher@de.ibm.com>
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*/
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2012-02-15 23:06:19 +00:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2005-06-22 23:43:34 +00:00
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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2008-05-19 13:09:45 +00:00
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#include <linux/uaccess.h>
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2005-06-22 23:43:34 +00:00
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#include <asm/rtas.h>
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#define WDRTAS_MAGIC_CHAR 42
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#define WDRTAS_SUPPORTED_MASK (WDIOF_SETTIMEOUT | \
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WDIOF_MAGICCLOSE)
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MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>");
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MODULE_DESCRIPTION("RTAS watchdog driver");
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MODULE_LICENSE("GPL");
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2012-03-05 15:51:11 +00:00
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static bool wdrtas_nowayout = WATCHDOG_NOWAYOUT;
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2005-06-22 23:43:34 +00:00
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static atomic_t wdrtas_miscdev_open = ATOMIC_INIT(0);
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2008-05-19 13:09:45 +00:00
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static char wdrtas_expect_close;
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2005-06-22 23:43:34 +00:00
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static int wdrtas_interval;
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#define WDRTAS_THERMAL_SENSOR 3
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static int wdrtas_token_get_sensor_state;
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#define WDRTAS_SURVEILLANCE_IND 9000
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static int wdrtas_token_set_indicator;
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#define WDRTAS_SP_SPI 28
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static int wdrtas_token_get_sp;
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static int wdrtas_token_event_scan;
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#define WDRTAS_DEFAULT_INTERVAL 300
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#define WDRTAS_LOGBUFFER_LEN 128
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static char wdrtas_logbuffer[WDRTAS_LOGBUFFER_LEN];
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/*** watchdog access functions */
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/**
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* wdrtas_set_interval - sets the watchdog interval
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* @interval: new interval
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*
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* returns 0 on success, <0 on failures
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*
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* wdrtas_set_interval sets the watchdog keepalive interval by calling the
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* RTAS function set-indicator (surveillance). The unit of interval is
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* seconds.
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*/
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2008-05-19 13:09:45 +00:00
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static int wdrtas_set_interval(int interval)
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2005-06-22 23:43:34 +00:00
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{
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long result;
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static int print_msg = 10;
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/* rtas uses minutes */
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interval = (interval + 59) / 60;
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result = rtas_call(wdrtas_token_set_indicator, 3, 1, NULL,
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WDRTAS_SURVEILLANCE_IND, 0, interval);
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2008-05-19 13:09:45 +00:00
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if (result < 0 && print_msg) {
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2012-02-15 23:06:19 +00:00
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pr_err("setting the watchdog to %i timeout failed: %li\n",
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interval, result);
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2005-06-22 23:43:34 +00:00
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print_msg--;
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}
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return result;
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}
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2009-03-23 20:30:41 +00:00
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#define WDRTAS_SP_SPI_LEN 4
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2005-06-22 23:43:34 +00:00
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/**
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* wdrtas_get_interval - returns the current watchdog interval
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* @fallback_value: value (in seconds) to use, if the RTAS call fails
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*
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* returns the interval
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*
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* wdrtas_get_interval returns the current watchdog keepalive interval
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* as reported by the RTAS function ibm,get-system-parameter. The unit
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* of the return value is seconds.
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*/
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2008-05-19 13:09:45 +00:00
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static int wdrtas_get_interval(int fallback_value)
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2005-06-22 23:43:34 +00:00
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{
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long result;
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2009-03-23 20:30:41 +00:00
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char value[WDRTAS_SP_SPI_LEN];
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2005-06-22 23:43:34 +00:00
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2009-03-23 20:30:41 +00:00
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spin_lock(&rtas_data_buf_lock);
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memset(rtas_data_buf, 0, WDRTAS_SP_SPI_LEN);
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2005-06-22 23:43:34 +00:00
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result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL,
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2009-03-23 20:30:41 +00:00
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WDRTAS_SP_SPI, __pa(rtas_data_buf),
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WDRTAS_SP_SPI_LEN);
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memcpy(value, rtas_data_buf, WDRTAS_SP_SPI_LEN);
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spin_unlock(&rtas_data_buf_lock);
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2008-05-19 13:09:45 +00:00
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if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) {
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2012-02-15 23:06:19 +00:00
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pr_warn("could not get sp_spi watchdog timeout (%li). Continuing\n",
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result);
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2005-06-22 23:43:34 +00:00
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return fallback_value;
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}
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/* rtas uses minutes */
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return ((int)value[2]) * 60;
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}
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/**
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* wdrtas_timer_start - starts watchdog
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*
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* wdrtas_timer_start starts the watchdog by calling the RTAS function
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* set-interval (surveillance)
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*/
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2008-05-19 13:09:45 +00:00
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static void wdrtas_timer_start(void)
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2005-06-22 23:43:34 +00:00
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{
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wdrtas_set_interval(wdrtas_interval);
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}
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/**
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* wdrtas_timer_stop - stops watchdog
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*
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* wdrtas_timer_stop stops the watchdog timer by calling the RTAS function
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* set-interval (surveillance)
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*/
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2008-05-19 13:09:45 +00:00
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static void wdrtas_timer_stop(void)
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2005-06-22 23:43:34 +00:00
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{
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wdrtas_set_interval(0);
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}
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/**
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* wdrtas_timer_keepalive - resets watchdog timer to keep system alive
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*
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* wdrtas_timer_keepalive restarts the watchdog timer by calling the
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* RTAS function event-scan and repeats these calls as long as there are
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* events available. All events will be dumped.
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*/
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2008-05-19 13:09:45 +00:00
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static void wdrtas_timer_keepalive(void)
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2005-06-22 23:43:34 +00:00
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{
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long result;
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do {
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result = rtas_call(wdrtas_token_event_scan, 4, 1, NULL,
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RTAS_EVENT_SCAN_ALL_EVENTS, 0,
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(void *)__pa(wdrtas_logbuffer),
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WDRTAS_LOGBUFFER_LEN);
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if (result < 0)
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2012-02-15 23:06:19 +00:00
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pr_err("event-scan failed: %li\n", result);
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2005-06-22 23:43:34 +00:00
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if (result == 0)
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2013-05-28 09:25:49 +00:00
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print_hex_dump(KERN_INFO, "dumping event, data: ",
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DUMP_PREFIX_OFFSET, 16, 1,
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wdrtas_logbuffer, WDRTAS_LOGBUFFER_LEN, false);
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2005-06-22 23:43:34 +00:00
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} while (result == 0);
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}
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/**
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* wdrtas_get_temperature - returns current temperature
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*
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* returns temperature or <0 on failures
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*
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* wdrtas_get_temperature returns the current temperature in Fahrenheit. It
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* uses the RTAS call get-sensor-state, token 3 to do so
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*/
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2008-05-19 13:09:45 +00:00
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static int wdrtas_get_temperature(void)
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2005-06-22 23:43:34 +00:00
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{
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2009-03-26 02:05:42 +00:00
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int result;
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2005-06-22 23:43:34 +00:00
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int temperature = 0;
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2009-03-26 02:05:42 +00:00
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result = rtas_get_sensor(WDRTAS_THERMAL_SENSOR, 0, &temperature);
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2005-06-22 23:43:34 +00:00
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if (result < 0)
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2012-02-15 23:06:19 +00:00
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pr_warn("reading the thermal sensor failed: %i\n", result);
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2005-06-22 23:43:34 +00:00
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else
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temperature = ((temperature * 9) / 5) + 32; /* fahrenheit */
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return temperature;
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}
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/**
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* wdrtas_get_status - returns the status of the watchdog
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*
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* returns a bitmask of defines WDIOF_... as defined in
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* include/linux/watchdog.h
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*/
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2008-05-19 13:09:45 +00:00
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static int wdrtas_get_status(void)
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2005-06-22 23:43:34 +00:00
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{
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return 0; /* TODO */
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}
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/**
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* wdrtas_get_boot_status - returns the reason for the last boot
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*
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* returns a bitmask of defines WDIOF_... as defined in
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* include/linux/watchdog.h, indicating why the watchdog rebooted the system
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*/
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2008-05-19 13:09:45 +00:00
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static int wdrtas_get_boot_status(void)
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2005-06-22 23:43:34 +00:00
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{
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return 0; /* TODO */
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}
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/*** watchdog API and operations stuff */
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/* wdrtas_write - called when watchdog device is written to
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* @file: file structure
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* @buf: user buffer with data
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* @len: amount to data written
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* @ppos: position in file
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*
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* returns the number of successfully processed characters, which is always
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* the number of bytes passed to this function
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*
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* wdrtas_write processes all the data given to it and looks for the magic
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* character 'V'. This character allows the watchdog device to be closed
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* properly.
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*/
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2008-05-19 13:09:45 +00:00
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static ssize_t wdrtas_write(struct file *file, const char __user *buf,
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2005-06-22 23:43:34 +00:00
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size_t len, loff_t *ppos)
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{
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int i;
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char c;
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if (!len)
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goto out;
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if (!wdrtas_nowayout) {
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wdrtas_expect_close = 0;
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/* look for 'V' */
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for (i = 0; i < len; i++) {
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if (get_user(c, buf + i))
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return -EFAULT;
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/* allow to close device */
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if (c == 'V')
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wdrtas_expect_close = WDRTAS_MAGIC_CHAR;
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}
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}
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wdrtas_timer_keepalive();
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out:
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return len;
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}
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/**
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* wdrtas_ioctl - ioctl function for the watchdog device
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* @file: file structure
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* @cmd: command for ioctl
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* @arg: argument pointer
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*
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* returns 0 on success, <0 on failure
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*
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* wdrtas_ioctl implements the watchdog API ioctls
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*/
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2008-05-19 13:09:45 +00:00
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static long wdrtas_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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2005-06-22 23:43:34 +00:00
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{
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2005-12-15 09:18:05 +00:00
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int __user *argp = (void __user *)arg;
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2005-06-22 23:43:34 +00:00
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int i;
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2009-12-26 18:55:22 +00:00
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static const struct watchdog_info wdinfo = {
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2005-06-22 23:43:34 +00:00
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.options = WDRTAS_SUPPORTED_MASK,
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.firmware_version = 0,
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2008-08-06 20:19:41 +00:00
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.identity = "wdrtas",
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2005-06-22 23:43:34 +00:00
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &wdinfo, sizeof(wdinfo)))
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return -EFAULT;
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return 0;
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case WDIOC_GETSTATUS:
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i = wdrtas_get_status();
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return put_user(i, argp);
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case WDIOC_GETBOOTSTATUS:
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i = wdrtas_get_boot_status();
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return put_user(i, argp);
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case WDIOC_GETTEMP:
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if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE)
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return -EOPNOTSUPP;
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i = wdrtas_get_temperature();
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return put_user(i, argp);
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case WDIOC_SETOPTIONS:
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if (get_user(i, argp))
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return -EFAULT;
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if (i & WDIOS_DISABLECARD)
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wdrtas_timer_stop();
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if (i & WDIOS_ENABLECARD) {
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wdrtas_timer_keepalive();
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wdrtas_timer_start();
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}
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2008-05-19 13:09:45 +00:00
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/* not implemented. Done by H8
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2005-06-22 23:43:34 +00:00
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if (i & WDIOS_TEMPPANIC) {
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2008-05-19 13:09:45 +00:00
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} */
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2005-06-22 23:43:34 +00:00
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return 0;
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case WDIOC_KEEPALIVE:
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wdrtas_timer_keepalive();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(i, argp))
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return -EFAULT;
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if (wdrtas_set_interval(i))
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return -EINVAL;
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wdrtas_timer_keepalive();
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if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE)
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wdrtas_interval = i;
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else
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wdrtas_interval = wdrtas_get_interval(i);
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/* fallthrough */
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case WDIOC_GETTIMEOUT:
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|
return put_user(wdrtas_interval, argp);
|
|
|
|
|
|
|
|
default:
|
2006-09-09 15:34:31 +00:00
|
|
|
return -ENOTTY;
|
2005-06-22 23:43:34 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_open - open function of watchdog device
|
|
|
|
* @inode: inode structure
|
|
|
|
* @file: file structure
|
|
|
|
*
|
|
|
|
* returns 0 on success, -EBUSY if the file has been opened already, <0 on
|
|
|
|
* other failures
|
|
|
|
*
|
|
|
|
* function called when watchdog device is opened
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int wdrtas_open(struct inode *inode, struct file *file)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
/* only open once */
|
|
|
|
if (atomic_inc_return(&wdrtas_miscdev_open) > 1) {
|
|
|
|
atomic_dec(&wdrtas_miscdev_open);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
wdrtas_timer_start();
|
|
|
|
wdrtas_timer_keepalive();
|
|
|
|
|
2019-03-26 20:51:19 +00:00
|
|
|
return stream_open(inode, file);
|
2005-06-22 23:43:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_close - close function of watchdog device
|
|
|
|
* @inode: inode structure
|
|
|
|
* @file: file structure
|
|
|
|
*
|
|
|
|
* returns 0 on success
|
|
|
|
*
|
|
|
|
* close function. Always succeeds
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int wdrtas_close(struct inode *inode, struct file *file)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
/* only stop watchdog, if this was announced using 'V' before */
|
|
|
|
if (wdrtas_expect_close == WDRTAS_MAGIC_CHAR)
|
|
|
|
wdrtas_timer_stop();
|
|
|
|
else {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_warn("got unexpected close. Watchdog not stopped.\n");
|
2005-06-22 23:43:34 +00:00
|
|
|
wdrtas_timer_keepalive();
|
|
|
|
}
|
|
|
|
|
|
|
|
wdrtas_expect_close = 0;
|
|
|
|
atomic_dec(&wdrtas_miscdev_open);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_temp_read - gives back the temperature in fahrenheit
|
|
|
|
* @file: file structure
|
|
|
|
* @buf: user buffer
|
|
|
|
* @count: number of bytes to be read
|
|
|
|
* @ppos: position in file
|
|
|
|
*
|
|
|
|
* returns always 1 or -EFAULT in case of user space copy failures, <0 on
|
|
|
|
* other failures
|
|
|
|
*
|
|
|
|
* wdrtas_temp_read gives the temperature to the users by copying this
|
|
|
|
* value as one byte into the user space buffer. The unit is Fahrenheit...
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static ssize_t wdrtas_temp_read(struct file *file, char __user *buf,
|
2005-06-22 23:43:34 +00:00
|
|
|
size_t count, loff_t *ppos)
|
|
|
|
{
|
|
|
|
int temperature = 0;
|
|
|
|
|
|
|
|
temperature = wdrtas_get_temperature();
|
|
|
|
if (temperature < 0)
|
|
|
|
return temperature;
|
|
|
|
|
|
|
|
if (copy_to_user(buf, &temperature, 1))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_temp_open - open function of temperature device
|
|
|
|
* @inode: inode structure
|
|
|
|
* @file: file structure
|
|
|
|
*
|
|
|
|
* returns 0 on success, <0 on failure
|
|
|
|
*
|
|
|
|
* function called when temperature device is opened
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int wdrtas_temp_open(struct inode *inode, struct file *file)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
2019-03-26 20:51:19 +00:00
|
|
|
return stream_open(inode, file);
|
2005-06-22 23:43:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_temp_close - close function of temperature device
|
|
|
|
* @inode: inode structure
|
|
|
|
* @file: file structure
|
|
|
|
*
|
|
|
|
* returns 0 on success
|
|
|
|
*
|
|
|
|
* close function. Always succeeds
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int wdrtas_temp_close(struct inode *inode, struct file *file)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_reboot - reboot notifier function
|
|
|
|
* @nb: notifier block structure
|
|
|
|
* @code: reboot code
|
|
|
|
* @ptr: unused
|
|
|
|
*
|
|
|
|
* returns NOTIFY_DONE
|
|
|
|
*
|
|
|
|
* wdrtas_reboot stops the watchdog in case of a reboot
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int wdrtas_reboot(struct notifier_block *this,
|
|
|
|
unsigned long code, void *ptr)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
2008-05-19 13:09:45 +00:00
|
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
2005-06-22 23:43:34 +00:00
|
|
|
wdrtas_timer_stop();
|
|
|
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*** initialization stuff */
|
|
|
|
|
2006-07-03 07:24:21 +00:00
|
|
|
static const struct file_operations wdrtas_fops = {
|
2005-06-22 23:43:34 +00:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
.write = wdrtas_write,
|
2008-05-19 13:09:45 +00:00
|
|
|
.unlocked_ioctl = wdrtas_ioctl,
|
2005-06-22 23:43:34 +00:00
|
|
|
.open = wdrtas_open,
|
|
|
|
.release = wdrtas_close,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice wdrtas_miscdev = {
|
|
|
|
.minor = WATCHDOG_MINOR,
|
|
|
|
.name = "watchdog",
|
|
|
|
.fops = &wdrtas_fops,
|
|
|
|
};
|
|
|
|
|
2006-07-03 07:24:21 +00:00
|
|
|
static const struct file_operations wdrtas_temp_fops = {
|
2005-06-22 23:43:34 +00:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
.read = wdrtas_temp_read,
|
|
|
|
.open = wdrtas_temp_open,
|
|
|
|
.release = wdrtas_temp_close,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice wdrtas_tempdev = {
|
|
|
|
.minor = TEMP_MINOR,
|
|
|
|
.name = "temperature",
|
|
|
|
.fops = &wdrtas_temp_fops,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct notifier_block wdrtas_notifier = {
|
|
|
|
.notifier_call = wdrtas_reboot,
|
|
|
|
};
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_get_tokens - reads in RTAS tokens
|
|
|
|
*
|
tree-wide: fix assorted typos all over the place
That is "success", "unknown", "through", "performance", "[re|un]mapping"
, "access", "default", "reasonable", "[con]currently", "temperature"
, "channel", "[un]used", "application", "example","hierarchy", "therefore"
, "[over|under]flow", "contiguous", "threshold", "enough" and others.
Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-11-14 15:09:05 +00:00
|
|
|
* returns 0 on success, <0 on failure
|
2005-06-22 23:43:34 +00:00
|
|
|
*
|
|
|
|
* wdrtas_get_tokens reads in the tokens for the RTAS calls used in
|
|
|
|
* this watchdog driver. It tolerates, if "get-sensor-state" and
|
|
|
|
* "ibm,get-system-parameter" are not available.
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int wdrtas_get_tokens(void)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
wdrtas_token_get_sensor_state = rtas_token("get-sensor-state");
|
|
|
|
if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_warn("couldn't get token for get-sensor-state. Trying to continue without temperature support.\n");
|
2005-06-22 23:43:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
wdrtas_token_get_sp = rtas_token("ibm,get-system-parameter");
|
|
|
|
if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_warn("couldn't get token for ibm,get-system-parameter. Trying to continue with a default timeout value of %i seconds.\n",
|
|
|
|
WDRTAS_DEFAULT_INTERVAL);
|
2005-06-22 23:43:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
wdrtas_token_set_indicator = rtas_token("set-indicator");
|
|
|
|
if (wdrtas_token_set_indicator == RTAS_UNKNOWN_SERVICE) {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_err("couldn't get token for set-indicator. Terminating watchdog code.\n");
|
2005-06-22 23:43:34 +00:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
wdrtas_token_event_scan = rtas_token("event-scan");
|
|
|
|
if (wdrtas_token_event_scan == RTAS_UNKNOWN_SERVICE) {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_err("couldn't get token for event-scan. Terminating watchdog code.\n");
|
2005-06-22 23:43:34 +00:00
|
|
|
return -EIO;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_unregister_devs - unregisters the misc dev handlers
|
|
|
|
*
|
|
|
|
* wdrtas_register_devs unregisters the watchdog and temperature watchdog
|
|
|
|
* misc devs
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static void wdrtas_unregister_devs(void)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
misc_deregister(&wdrtas_miscdev);
|
|
|
|
if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE)
|
|
|
|
misc_deregister(&wdrtas_tempdev);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_register_devs - registers the misc dev handlers
|
|
|
|
*
|
tree-wide: fix assorted typos all over the place
That is "success", "unknown", "through", "performance", "[re|un]mapping"
, "access", "default", "reasonable", "[con]currently", "temperature"
, "channel", "[un]used", "application", "example","hierarchy", "therefore"
, "[over|under]flow", "contiguous", "threshold", "enough" and others.
Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-11-14 15:09:05 +00:00
|
|
|
* returns 0 on success, <0 on failure
|
2005-06-22 23:43:34 +00:00
|
|
|
*
|
|
|
|
* wdrtas_register_devs registers the watchdog and temperature watchdog
|
|
|
|
* misc devs
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int wdrtas_register_devs(void)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
int result;
|
|
|
|
|
|
|
|
result = misc_register(&wdrtas_miscdev);
|
|
|
|
if (result) {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_err("couldn't register watchdog misc device. Terminating watchdog code.\n");
|
2005-06-22 23:43:34 +00:00
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) {
|
|
|
|
result = misc_register(&wdrtas_tempdev);
|
|
|
|
if (result) {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_warn("couldn't register watchdog temperature misc device. Continuing without temperature support.\n");
|
2005-06-22 23:43:34 +00:00
|
|
|
wdrtas_token_get_sensor_state = RTAS_UNKNOWN_SERVICE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_init - init function of the watchdog driver
|
|
|
|
*
|
tree-wide: fix assorted typos all over the place
That is "success", "unknown", "through", "performance", "[re|un]mapping"
, "access", "default", "reasonable", "[con]currently", "temperature"
, "channel", "[un]used", "application", "example","hierarchy", "therefore"
, "[over|under]flow", "contiguous", "threshold", "enough" and others.
Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-11-14 15:09:05 +00:00
|
|
|
* returns 0 on success, <0 on failure
|
2005-06-22 23:43:34 +00:00
|
|
|
*
|
|
|
|
* registers the file handlers and the reboot notifier
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static int __init wdrtas_init(void)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
if (wdrtas_get_tokens())
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
if (wdrtas_register_devs())
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
if (register_reboot_notifier(&wdrtas_notifier)) {
|
2012-02-15 23:06:19 +00:00
|
|
|
pr_err("could not register reboot notifier. Terminating watchdog code.\n");
|
2005-06-22 23:43:34 +00:00
|
|
|
wdrtas_unregister_devs();
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE)
|
|
|
|
wdrtas_interval = WDRTAS_DEFAULT_INTERVAL;
|
|
|
|
else
|
|
|
|
wdrtas_interval = wdrtas_get_interval(WDRTAS_DEFAULT_INTERVAL);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* wdrtas_exit - exit function of the watchdog driver
|
|
|
|
*
|
|
|
|
* unregisters the file handlers and the reboot notifier
|
|
|
|
*/
|
2008-05-19 13:09:45 +00:00
|
|
|
static void __exit wdrtas_exit(void)
|
2005-06-22 23:43:34 +00:00
|
|
|
{
|
|
|
|
if (!wdrtas_nowayout)
|
|
|
|
wdrtas_timer_stop();
|
|
|
|
|
|
|
|
wdrtas_unregister_devs();
|
|
|
|
|
|
|
|
unregister_reboot_notifier(&wdrtas_notifier);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(wdrtas_init);
|
|
|
|
module_exit(wdrtas_exit);
|