hwmon: (w83793) Add watchdog functionality
Add watchdog functionality to the Winbond W83793 driver. Signed-off-by: Sven Anders <anders@anduras.de> Acked-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>wifi-calibration
Sven Anders
Jean Delvare
parent
ebec05bdc4
commit
5852f9609d
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@ -910,7 +910,8 @@ config SENSORS_W83793
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select HWMON_VID
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help
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If you say yes here you get support for the Winbond W83793
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hardware monitoring chip.
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hardware monitoring chip, including support for the integrated
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watchdog.
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This driver can also be built as a module. If so, the module
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will be called w83793.
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@ -3,6 +3,10 @@
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Copyright (C) 2006 Winbond Electronics Corp.
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Yuan Mu
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Rudolf Marek <r.marek@assembler.cz>
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Copyright (C) 2009-2010 Sven Anders <anders@anduras.de>, ANDURAS AG.
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Watchdog driver part
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(Based partially on fschmd driver,
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Copyright 2007-2008 by Hans de Goede)
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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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@ -35,6 +39,16 @@
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#include <linux/hwmon-sysfs.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/fs.h>
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#include <linux/watchdog.h>
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#include <linux/miscdevice.h>
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#include <linux/uaccess.h>
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#include <linux/kref.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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/* Default values */
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#define WATCHDOG_TIMEOUT 2 /* 2 minute default timeout */
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/* Addresses to scan */
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static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
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@ -51,6 +65,18 @@ static int reset;
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module_param(reset, bool, 0);
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MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
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static int timeout = WATCHDOG_TIMEOUT; /* default timeout in minutes */
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout,
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"Watchdog timeout in minutes. 2<= timeout <=255 (default="
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__MODULE_STRING(WATCHDOG_TIMEOUT) ")");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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Address 0x00, 0x0d, 0x0e, 0x0f in all three banks are reserved
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as ID, Bank Select registers
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@ -72,6 +98,11 @@ MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");
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#define W83793_REG_VID_LATCHB 0x08
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#define W83793_REG_VID_CTRL 0x59
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#define W83793_REG_WDT_LOCK 0x01
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#define W83793_REG_WDT_ENABLE 0x02
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#define W83793_REG_WDT_STATUS 0x03
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#define W83793_REG_WDT_TIMEOUT 0x04
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static u16 W83793_REG_TEMP_MODE[2] = { 0x5e, 0x5f };
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#define TEMP_READ 0
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@ -223,8 +254,37 @@ struct w83793_data {
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u8 tolerance[3]; /* Temp tolerance(Smart Fan I/II) */
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u8 sf2_pwm[6][7]; /* Smart FanII: Fan duty cycle */
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u8 sf2_temp[6][7]; /* Smart FanII: Temp level point */
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/* watchdog */
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struct i2c_client *client;
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struct mutex watchdog_lock;
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struct list_head list; /* member of the watchdog_data_list */
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struct kref kref;
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struct miscdevice watchdog_miscdev;
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unsigned long watchdog_is_open;
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char watchdog_expect_close;
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char watchdog_name[10]; /* must be unique to avoid sysfs conflict */
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unsigned int watchdog_caused_reboot;
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int watchdog_timeout; /* watchdog timeout in minutes */
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};
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/* Somewhat ugly :( global data pointer list with all devices, so that
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we can find our device data as when using misc_register. There is no
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other method to get to one's device data from the open file-op and
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for usage in the reboot notifier callback. */
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static LIST_HEAD(watchdog_data_list);
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/* Note this lock not only protect list access, but also data.kref access */
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static DEFINE_MUTEX(watchdog_data_mutex);
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/* Release our data struct when we're detached from the i2c client *and* all
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references to our watchdog device are released */
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static void w83793_release_resources(struct kref *ref)
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{
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struct w83793_data *data = container_of(ref, struct w83793_data, kref);
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kfree(data);
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}
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static u8 w83793_read_value(struct i2c_client *client, u16 reg);
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static int w83793_write_value(struct i2c_client *client, u16 reg, u8 value);
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static int w83793_probe(struct i2c_client *client,
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@ -1063,14 +1123,349 @@ static void w83793_init_client(struct i2c_client *client)
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/* Start monitoring */
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w83793_write_value(client, W83793_REG_CONFIG,
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w83793_read_value(client, W83793_REG_CONFIG) | 0x01);
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}
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/*
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* Watchdog routines
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*/
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static int watchdog_set_timeout(struct w83793_data *data, int timeout)
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{
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int ret, mtimeout;
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mtimeout = DIV_ROUND_UP(timeout, 60);
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if (mtimeout > 255)
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return -EINVAL;
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mutex_lock(&data->watchdog_lock);
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if (!data->client) {
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ret = -ENODEV;
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goto leave;
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}
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data->watchdog_timeout = mtimeout;
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/* Set Timeout value (in Minutes) */
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w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
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data->watchdog_timeout);
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ret = mtimeout * 60;
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leave:
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mutex_unlock(&data->watchdog_lock);
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return ret;
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}
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static int watchdog_get_timeout(struct w83793_data *data)
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{
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int timeout;
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mutex_lock(&data->watchdog_lock);
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timeout = data->watchdog_timeout * 60;
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mutex_unlock(&data->watchdog_lock);
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return timeout;
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}
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static int watchdog_trigger(struct w83793_data *data)
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{
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int ret = 0;
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mutex_lock(&data->watchdog_lock);
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if (!data->client) {
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ret = -ENODEV;
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goto leave;
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}
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/* Set Timeout value (in Minutes) */
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w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
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data->watchdog_timeout);
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leave:
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mutex_unlock(&data->watchdog_lock);
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return ret;
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}
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static int watchdog_enable(struct w83793_data *data)
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{
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int ret = 0;
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mutex_lock(&data->watchdog_lock);
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if (!data->client) {
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ret = -ENODEV;
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goto leave;
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}
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/* Set initial timeout */
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w83793_write_value(data->client, W83793_REG_WDT_TIMEOUT,
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data->watchdog_timeout);
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/* Enable Soft Watchdog */
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w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0x55);
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leave:
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mutex_unlock(&data->watchdog_lock);
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return ret;
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}
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static int watchdog_disable(struct w83793_data *data)
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{
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int ret = 0;
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mutex_lock(&data->watchdog_lock);
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if (!data->client) {
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ret = -ENODEV;
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goto leave;
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}
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/* Disable Soft Watchdog */
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w83793_write_value(data->client, W83793_REG_WDT_LOCK, 0xAA);
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leave:
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mutex_unlock(&data->watchdog_lock);
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return ret;
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}
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static int watchdog_open(struct inode *inode, struct file *filp)
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{
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struct w83793_data *pos, *data = NULL;
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int watchdog_is_open;
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/* We get called from drivers/char/misc.c with misc_mtx hold, and we
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call misc_register() from w83793_probe() with watchdog_data_mutex
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hold, as misc_register() takes the misc_mtx lock, this is a possible
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deadlock, so we use mutex_trylock here. */
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if (!mutex_trylock(&watchdog_data_mutex))
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return -ERESTARTSYS;
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list_for_each_entry(pos, &watchdog_data_list, list) {
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if (pos->watchdog_miscdev.minor == iminor(inode)) {
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data = pos;
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break;
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}
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}
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/* Check, if device is already open */
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watchdog_is_open = test_and_set_bit(0, &data->watchdog_is_open);
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/* Increase data reference counter (if not already done).
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Note we can never not have found data, so we don't check for this */
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if (!watchdog_is_open)
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kref_get(&data->kref);
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mutex_unlock(&watchdog_data_mutex);
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/* Check, if device is already open and possibly issue error */
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if (watchdog_is_open)
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return -EBUSY;
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/* Enable Soft Watchdog */
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watchdog_enable(data);
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/* Store pointer to data into filp's private data */
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filp->private_data = data;
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return nonseekable_open(inode, filp);
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}
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static int watchdog_close(struct inode *inode, struct file *filp)
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{
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struct w83793_data *data = filp->private_data;
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if (data->watchdog_expect_close) {
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watchdog_disable(data);
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data->watchdog_expect_close = 0;
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} else {
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watchdog_trigger(data);
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dev_crit(&data->client->dev,
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"unexpected close, not stopping watchdog!\n");
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}
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clear_bit(0, &data->watchdog_is_open);
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/* Decrease data reference counter */
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mutex_lock(&watchdog_data_mutex);
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kref_put(&data->kref, w83793_release_resources);
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mutex_unlock(&watchdog_data_mutex);
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return 0;
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}
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static ssize_t watchdog_write(struct file *filp, const char __user *buf,
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size_t count, loff_t *offset)
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{
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size_t ret;
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struct w83793_data *data = filp->private_data;
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if (count) {
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if (!nowayout) {
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size_t i;
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/* Clear it in case it was set with a previous write */
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data->watchdog_expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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data->watchdog_expect_close = 1;
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}
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}
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ret = watchdog_trigger(data);
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if (ret < 0)
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return ret;
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}
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return count;
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}
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static int watchdog_ioctl(struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long arg)
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{
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static struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING |
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WDIOF_SETTIMEOUT |
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WDIOF_CARDRESET,
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.identity = "w83793 watchdog"
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};
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int val, ret = 0;
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struct w83793_data *data = filp->private_data;
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (!nowayout)
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ident.options |= WDIOF_MAGICCLOSE;
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if (copy_to_user((void __user *)arg, &ident, sizeof(ident)))
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ret = -EFAULT;
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break;
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case WDIOC_GETSTATUS:
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val = data->watchdog_caused_reboot ? WDIOF_CARDRESET : 0;
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ret = put_user(val, (int __user *)arg);
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break;
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case WDIOC_GETBOOTSTATUS:
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ret = put_user(0, (int __user *)arg);
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break;
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case WDIOC_KEEPALIVE:
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ret = watchdog_trigger(data);
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break;
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case WDIOC_GETTIMEOUT:
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val = watchdog_get_timeout(data);
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ret = put_user(val, (int __user *)arg);
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break;
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case WDIOC_SETTIMEOUT:
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if (get_user(val, (int __user *)arg)) {
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ret = -EFAULT;
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break;
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}
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ret = watchdog_set_timeout(data, val);
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if (ret > 0)
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ret = put_user(ret, (int __user *)arg);
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break;
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case WDIOC_SETOPTIONS:
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if (get_user(val, (int __user *)arg)) {
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ret = -EFAULT;
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break;
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}
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if (val & WDIOS_DISABLECARD)
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ret = watchdog_disable(data);
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else if (val & WDIOS_ENABLECARD)
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ret = watchdog_enable(data);
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else
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ret = -EINVAL;
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break;
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default:
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ret = -ENOTTY;
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}
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return ret;
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}
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static const struct file_operations watchdog_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.open = watchdog_open,
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.release = watchdog_close,
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.write = watchdog_write,
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.ioctl = watchdog_ioctl,
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};
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/*
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* Notifier for system down
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*/
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static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
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void *unused)
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{
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struct w83793_data *data = NULL;
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if (code == SYS_DOWN || code == SYS_HALT) {
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/* Disable each registered watchdog */
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mutex_lock(&watchdog_data_mutex);
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list_for_each_entry(data, &watchdog_data_list, list) {
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if (data->watchdog_miscdev.minor)
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watchdog_disable(data);
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}
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mutex_unlock(&watchdog_data_mutex);
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}
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return NOTIFY_DONE;
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}
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/*
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* The WDT needs to learn about soft shutdowns in order to
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* turn the timebomb registers off.
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*/
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static struct notifier_block watchdog_notifier = {
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.notifier_call = watchdog_notify_sys,
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};
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/*
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* Init / remove routines
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*/
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static int w83793_remove(struct i2c_client *client)
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{
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struct w83793_data *data = i2c_get_clientdata(client);
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struct device *dev = &client->dev;
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int i;
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int i, tmp;
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/* Unregister the watchdog (if registered) */
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if (data->watchdog_miscdev.minor) {
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misc_deregister(&data->watchdog_miscdev);
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if (data->watchdog_is_open) {
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dev_warn(&client->dev,
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"i2c client detached with watchdog open! "
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"Stopping watchdog.\n");
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watchdog_disable(data);
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}
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mutex_lock(&watchdog_data_mutex);
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list_del(&data->list);
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mutex_unlock(&watchdog_data_mutex);
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/* Tell the watchdog code the client is gone */
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mutex_lock(&data->watchdog_lock);
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data->client = NULL;
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mutex_unlock(&data->watchdog_lock);
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}
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/* Reset Configuration Register to Disable Watch Dog Registers */
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tmp = w83793_read_value(client, W83793_REG_CONFIG);
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w83793_write_value(client, W83793_REG_CONFIG, tmp & ~0x04);
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unregister_reboot_notifier(&watchdog_notifier);
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hwmon_device_unregister(data->hwmon_dev);
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@ -1099,7 +1494,10 @@ static int w83793_remove(struct i2c_client *client)
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if (data->lm75[1] != NULL)
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i2c_unregister_device(data->lm75[1]);
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kfree(data);
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/* Decrease data reference counter */
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mutex_lock(&watchdog_data_mutex);
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kref_put(&data->kref, w83793_release_resources);
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mutex_unlock(&watchdog_data_mutex);
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return 0;
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}
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@ -1203,6 +1601,7 @@ static int w83793_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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const int watchdog_minors[] = { WATCHDOG_MINOR, 212, 213, 214, 215 };
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struct w83793_data *data;
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int i, tmp, val, err;
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int files_fan = ARRAY_SIZE(w83793_left_fan) / 7;
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@ -1218,6 +1617,14 @@ static int w83793_probe(struct i2c_client *client,
|
|||
i2c_set_clientdata(client, data);
|
||||
data->bank = i2c_smbus_read_byte_data(client, W83793_REG_BANKSEL);
|
||||
mutex_init(&data->update_lock);
|
||||
mutex_init(&data->watchdog_lock);
|
||||
INIT_LIST_HEAD(&data->list);
|
||||
kref_init(&data->kref);
|
||||
|
||||
/* Store client pointer in our data struct for watchdog usage
|
||||
(where the client is found through a data ptr instead of the
|
||||
otherway around) */
|
||||
data->client = client;
|
||||
|
||||
err = w83793_detect_subclients(client);
|
||||
if (err)
|
||||
|
|
@ -1380,8 +1787,77 @@ static int w83793_probe(struct i2c_client *client,
|
|||
goto exit_remove;
|
||||
}
|
||||
|
||||
/* Watchdog initialization */
|
||||
|
||||
/* Register boot notifier */
|
||||
err = register_reboot_notifier(&watchdog_notifier);
|
||||
if (err != 0) {
|
||||
dev_err(&client->dev,
|
||||
"cannot register reboot notifier (err=%d)\n", err);
|
||||
goto exit_devunreg;
|
||||
}
|
||||
|
||||
/* Enable Watchdog registers.
|
||||
Set Configuration Register to Enable Watch Dog Registers
|
||||
(Bit 2) = XXXX, X1XX. */
|
||||
tmp = w83793_read_value(client, W83793_REG_CONFIG);
|
||||
w83793_write_value(client, W83793_REG_CONFIG, tmp | 0x04);
|
||||
|
||||
/* Set the default watchdog timeout */
|
||||
data->watchdog_timeout = timeout;
|
||||
|
||||
/* Check, if last reboot was caused by watchdog */
|
||||
data->watchdog_caused_reboot =
|
||||
w83793_read_value(data->client, W83793_REG_WDT_STATUS) & 0x01;
|
||||
|
||||
/* Disable Soft Watchdog during initialiation */
|
||||
watchdog_disable(data);
|
||||
|
||||
/* We take the data_mutex lock early so that watchdog_open() cannot
|
||||
run when misc_register() has completed, but we've not yet added
|
||||
our data to the watchdog_data_list (and set the default timeout) */
|
||||
mutex_lock(&watchdog_data_mutex);
|
||||
for (i = 0; i < ARRAY_SIZE(watchdog_minors); i++) {
|
||||
/* Register our watchdog part */
|
||||
snprintf(data->watchdog_name, sizeof(data->watchdog_name),
|
||||
"watchdog%c", (i == 0) ? '\0' : ('0' + i));
|
||||
data->watchdog_miscdev.name = data->watchdog_name;
|
||||
data->watchdog_miscdev.fops = &watchdog_fops;
|
||||
data->watchdog_miscdev.minor = watchdog_minors[i];
|
||||
|
||||
err = misc_register(&data->watchdog_miscdev);
|
||||
if (err == -EBUSY)
|
||||
continue;
|
||||
if (err) {
|
||||
data->watchdog_miscdev.minor = 0;
|
||||
dev_err(&client->dev,
|
||||
"Registering watchdog chardev: %d\n", err);
|
||||
break;
|
||||
}
|
||||
|
||||
list_add(&data->list, &watchdog_data_list);
|
||||
|
||||
dev_info(&client->dev,
|
||||
"Registered watchdog chardev major 10, minor: %d\n",
|
||||
watchdog_minors[i]);
|
||||
break;
|
||||
}
|
||||
if (i == ARRAY_SIZE(watchdog_minors)) {
|
||||
data->watchdog_miscdev.minor = 0;
|
||||
dev_warn(&client->dev, "Couldn't register watchdog chardev "
|
||||
"(due to no free minor)\n");
|
||||
}
|
||||
|
||||
mutex_unlock(&watchdog_data_mutex);
|
||||
|
||||
return 0;
|
||||
|
||||
/* Unregister hwmon device */
|
||||
|
||||
exit_devunreg:
|
||||
|
||||
hwmon_device_unregister(data->hwmon_dev);
|
||||
|
||||
/* Unregister sysfs hooks */
|
||||
|
||||
exit_remove:
|
||||
|
|
@ -1628,7 +2104,7 @@ static void __exit sensors_w83793_exit(void)
|
|||
i2c_del_driver(&w83793_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Yuan Mu");
|
||||
MODULE_AUTHOR("Yuan Mu, Sven Anders");
|
||||
MODULE_DESCRIPTION("w83793 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue