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Message-ID: <1333880031.25028.3.camel@phoenix>
Date: Sun, 08 Apr 2012 18:13:51 +0800
From: Axel Lin <axel.lin@...il.com>
To: linux-kernel@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Wim Van Sebroeck <wim@...ana.be>,
linux-watchdog@...r.kernel.org
Subject: [PATCH RFT] watchdog: Convert riowd driver to watchdog framework
This patch converts riowd driver to use watchdog core APIs.
Signed-off-by: Axel Lin <axel.lin@...il.com>
---
drivers/watchdog/Kconfig | 1 +
drivers/watchdog/riowd.c | 178 +++++++++++++--------------------------------
2 files changed, 53 insertions(+), 126 deletions(-)
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 3709624..fbd3c2b 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1173,6 +1173,7 @@ config WATCHDOG_CP1XXX
config WATCHDOG_RIO
tristate "RIO Hardware Watchdog support"
depends on SPARC64 && PCI
+ select WATCHDOG_CORE
help
Say Y here to support the hardware watchdog capability on Sun RIO
machines. The watchdog timeout period is normally one minute but
diff --git a/drivers/watchdog/riowd.c b/drivers/watchdog/riowd.c
index 49e1b1c..d691567 100644
--- a/drivers/watchdog/riowd.c
+++ b/drivers/watchdog/riowd.c
@@ -8,15 +8,12 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
-#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/init.h>
-#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/io.h>
-#include <linux/uaccess.h>
#include <linux/slab.h>
@@ -52,181 +49,110 @@ MODULE_LICENSE("GPL");
#define DRIVER_NAME "riowd"
#define PFX DRIVER_NAME ": "
-struct riowd {
+struct riowd_wdt_drvdata {
void __iomem *regs;
spinlock_t lock;
};
-static struct riowd *riowd_device;
-
#define WDTO_INDEX 0x05
static int riowd_timeout = 1; /* in minutes */
module_param(riowd_timeout, int, 0);
MODULE_PARM_DESC(riowd_timeout, "Watchdog timeout in minutes");
-static void riowd_writereg(struct riowd *p, u8 val, int index)
+static void riowd_writereg(struct riowd_wdt_drvdata *drvdata, u8 val, int index)
{
unsigned long flags;
- spin_lock_irqsave(&p->lock, flags);
- writeb(index, p->regs + 0);
- writeb(val, p->regs + 1);
- spin_unlock_irqrestore(&p->lock, flags);
+ spin_lock_irqsave(&drvdata->lock, flags);
+ writeb(index, drvdata->regs + 0);
+ writeb(val, drvdata->regs + 1);
+ spin_unlock_irqrestore(&drvdata->lock, flags);
}
-static int riowd_open(struct inode *inode, struct file *filp)
+static int riowd_wdt_start(struct watchdog_device *wdd)
{
- nonseekable_open(inode, filp);
- return 0;
-}
+ struct riowd_wdt_drvdata *drvdata = watchdog_get_drvdata(wdd);
-static int riowd_release(struct inode *inode, struct file *filp)
-{
+ /* Write the watchdog time-out in minutes to WDTO_INDEX */
+ riowd_writereg(drvdata, wdd->timeout / 60, WDTO_INDEX);
return 0;
}
-static long riowd_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+static int riowd_wdt_stop(struct watchdog_device *wdd)
{
- static const struct watchdog_info info = {
- .options = WDIOF_SETTIMEOUT,
- .firmware_version = 1,
- .identity = DRIVER_NAME,
- };
- void __user *argp = (void __user *)arg;
- struct riowd *p = riowd_device;
- unsigned int options;
- int new_margin;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- if (copy_to_user(argp, &info, sizeof(info)))
- return -EFAULT;
- break;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- if (put_user(0, (int __user *)argp))
- return -EFAULT;
- break;
-
- case WDIOC_KEEPALIVE:
- riowd_writereg(p, riowd_timeout, WDTO_INDEX);
- break;
-
- case WDIOC_SETOPTIONS:
- if (copy_from_user(&options, argp, sizeof(options)))
- return -EFAULT;
-
- if (options & WDIOS_DISABLECARD)
- riowd_writereg(p, 0, WDTO_INDEX);
- else if (options & WDIOS_ENABLECARD)
- riowd_writereg(p, riowd_timeout, WDTO_INDEX);
- else
- return -EINVAL;
-
- break;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_margin, (int __user *)argp))
- return -EFAULT;
- if ((new_margin < 60) || (new_margin > (255 * 60)))
- return -EINVAL;
- riowd_timeout = (new_margin + 59) / 60;
- riowd_writereg(p, riowd_timeout, WDTO_INDEX);
- /* Fall */
-
- case WDIOC_GETTIMEOUT:
- return put_user(riowd_timeout * 60, (int __user *)argp);
-
- default:
- return -EINVAL;
- };
+ struct riowd_wdt_drvdata *drvdata = watchdog_get_drvdata(wdd);
+ riowd_writereg(drvdata, 0, WDTO_INDEX);
return 0;
}
-static ssize_t riowd_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static int riowd_wdt_set_timeout(struct watchdog_device *wdd, unsigned timeout)
{
- struct riowd *p = riowd_device;
-
- if (count) {
- riowd_writereg(p, riowd_timeout, WDTO_INDEX);
- return 1;
- }
-
+ wdd->timeout = DIV_ROUND_UP(timeout, 60) * 60;
return 0;
}
-static const struct file_operations riowd_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .unlocked_ioctl = riowd_ioctl,
- .open = riowd_open,
- .write = riowd_write,
- .release = riowd_release,
+static const struct watchdog_info riowd_wdt_info = {
+ .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
+ .firmware_version = 1,
+ .identity = DRIVER_NAME,
};
-static struct miscdevice riowd_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &riowd_fops
+static const struct watchdog_ops riowd_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = riowd_wdt_start,
+ .stop = riowd_wdt_stop,
+ .set_timeout = riowd_wdt_set_timeout,
+};
+
+static struct watchdog_device riowd_wdt_dev = {
+ .info = &riowd_wdt_info,
+ .ops = &riowd_wdt_ops,
+ .min_timeout = 60,
+ .max_timeout = 255 * 60,
};
static int __devinit riowd_probe(struct platform_device *op)
{
- struct riowd *p;
- int err = -EINVAL;
-
- if (riowd_device)
- goto out;
+ struct riowd_wdt_drvdata *drvdata;
+ int err;
- err = -ENOMEM;
- p = kzalloc(sizeof(*p), GFP_KERNEL);
- if (!p)
- goto out;
+ drvdata = devm_kzalloc(&op->dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
- spin_lock_init(&p->lock);
+ spin_lock_init(&drvdata->lock);
- p->regs = of_ioremap(&op->resource[0], 0, 2, DRIVER_NAME);
- if (!p->regs) {
+ drvdata->regs = of_ioremap(&op->resource[0], 0, 2, DRIVER_NAME);
+ if (!drvdata->regs) {
pr_err("Cannot map registers\n");
- goto out_free;
+ return -ENOMEM;
}
- /* Make miscdev useable right away */
- riowd_device = p;
- err = misc_register(&riowd_miscdev);
+ riowd_wdt_dev.timeout = riowd_timeout * 60;
+ watchdog_set_drvdata(&riowd_wdt_dev, drvdata);
+
+ err = watchdog_register_device(&riowd_wdt_dev);
if (err) {
- pr_err("Cannot register watchdog misc device\n");
- goto out_iounmap;
+ of_iounmap(&op->resource[0], drvdata->regs, 2);
+ return err;
}
pr_info("Hardware watchdog [%i minutes], regs at %p\n",
- riowd_timeout, p->regs);
+ riowd_timeout, drvdata->regs);
- dev_set_drvdata(&op->dev, p);
- return 0;
+ dev_set_drvdata(&op->dev, drvdata);
-out_iounmap:
- riowd_device = NULL;
- of_iounmap(&op->resource[0], p->regs, 2);
-
-out_free:
- kfree(p);
-
-out:
- return err;
+ return 0;
}
static int __devexit riowd_remove(struct platform_device *op)
{
- struct riowd *p = dev_get_drvdata(&op->dev);
+ struct riowd_wdt_drvdata *drvdata = dev_get_drvdata(&op->dev);
- misc_deregister(&riowd_miscdev);
- of_iounmap(&op->resource[0], p->regs, 2);
- kfree(p);
+ watchdog_unregister_device(&riowd_wdt_dev);
+ of_iounmap(&op->resource[0], drvdata->regs, 2);
return 0;
}
--
1.7.5.4
--
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