X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?p=linux-2.6-omap-h63xx.git;a=blobdiff_plain;f=drivers%2Fcbus%2Fretu-wdt.c;fp=drivers%2Fcbus%2Fretu-wdt.c;h=b7b20b7151ad9654a772570c0fc26408775132ee;hp=0000000000000000000000000000000000000000;hb=14fc69723d3442ef46f8f82b3f481e82f06a346d;hpb=c7d41fe1898f2fd6d9b9f98c7932fc5d6ca6bf3e

diff --git a/drivers/cbus/retu-wdt.c b/drivers/cbus/retu-wdt.c
new file mode 100644
index 00000000000..b7b20b7151a
--- /dev/null
+++ b/drivers/cbus/retu-wdt.c
@@ -0,0 +1,202 @@
+/**
+ * drivers/cbus/retu-wdt.c
+ *
+ * Driver for Retu watchdog
+ *
+ * Copyright (C) 2004, 2005 Nokia Corporation
+ *
+ * Written by Amit Kucheria <amit.kucheria@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/init.h>
+
+#include <linux/completion.h>
+#include <linux/errno.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+
+#include "cbus.h"
+#include "retu.h"
+
+/* Watchdog timeout in seconds */
+#define RETU_WDT_MIN_TIMER 0
+#define RETU_WDT_DEFAULT_TIMER 32
+#define RETU_WDT_MAX_TIMER 63
+
+static struct completion retu_wdt_completion;
+static DEFINE_MUTEX(retu_wdt_mutex);
+
+/* Current period of watchdog */
+static unsigned int period_val = RETU_WDT_DEFAULT_TIMER;
+static int counter_param = RETU_WDT_MAX_TIMER;
+
+static int retu_modify_counter(unsigned int new)
+{
+	int ret = 0;
+
+	if (new < RETU_WDT_MIN_TIMER || new > RETU_WDT_MAX_TIMER)
+		return -EINVAL;
+
+	mutex_lock(&retu_wdt_mutex);
+
+	period_val = new;
+	retu_write_reg(RETU_REG_WATCHDOG, (u16)period_val);
+
+	mutex_unlock(&retu_wdt_mutex);
+	return ret;
+}
+
+static ssize_t retu_wdt_period_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	/* Show current max counter */
+	return sprintf(buf, "%u\n", (u16)period_val);
+}
+
+static ssize_t retu_wdt_period_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	unsigned int new_period;
+	int ret;
+
+	if (sscanf(buf, "%u", &new_period) != 1) {
+		printk(KERN_ALERT "retu_wdt_period_store: Invalid input\n");
+		return -EINVAL;
+	}
+
+	ret = retu_modify_counter(new_period);
+	if (ret < 0)
+		return ret;
+
+	return strnlen(buf, count);
+}
+
+static ssize_t retu_wdt_counter_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	u16 counter;
+
+	/* Show current value in watchdog counter */
+	counter = retu_read_reg(RETU_REG_WATCHDOG);
+
+	/* Only the 5 LSB are important */
+	return snprintf(buf, PAGE_SIZE, "%u\n", (counter & 0x3F));
+}
+
+static DEVICE_ATTR(period, S_IRUGO | S_IWUSR, retu_wdt_period_show, \
+			retu_wdt_period_store);
+static DEVICE_ATTR(counter, S_IRUGO, retu_wdt_counter_show, NULL);
+
+static int __devinit retu_wdt_probe(struct device *dev)
+{
+	int ret;
+
+	ret = device_create_file(dev, &dev_attr_period);
+	if (ret) {
+		printk(KERN_ERR "retu_wdt_probe: Error creating "
+					"sys device file: period\n");
+		return ret;
+	}
+
+	ret = device_create_file(dev, &dev_attr_counter);
+	if (ret) {
+		device_remove_file(dev, &dev_attr_period);
+		printk(KERN_ERR "retu_wdt_probe: Error creating "
+					"sys device file: counter\n");
+	}
+
+	return ret;
+}
+
+static int __devexit retu_wdt_remove(struct device *dev)
+{
+	device_remove_file(dev, &dev_attr_period);
+	device_remove_file(dev, &dev_attr_counter);
+	return 0;
+}
+
+static void retu_wdt_device_release(struct device *dev)
+{
+	complete(&retu_wdt_completion);
+}
+
+static struct platform_device retu_wdt_device = {
+	.name = "retu-watchdog",
+	.id = -1,
+	.dev = {
+		.release = retu_wdt_device_release,
+	},
+};
+
+static struct device_driver retu_wdt_driver = {
+	.name = "retu-watchdog",
+	.bus = &platform_bus_type,
+	.probe = retu_wdt_probe,
+	.remove = __devexit_p(retu_wdt_remove),
+};
+
+static int __init retu_wdt_init(void)
+{
+	int ret;
+
+	init_completion(&retu_wdt_completion);
+
+	ret = driver_register(&retu_wdt_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_device_register(&retu_wdt_device);
+	if (ret)
+		goto exit1;
+
+	/* passed as module parameter? */
+	ret = retu_modify_counter(counter_param);
+	if (ret == -EINVAL) {
+		ret = retu_modify_counter(RETU_WDT_DEFAULT_TIMER);
+		printk(KERN_INFO
+		       "retu_wdt_init: Intializing to default value\n");
+	}
+
+	printk(KERN_INFO "Retu watchdog driver initialized\n");
+	return ret;
+
+exit1:
+	driver_unregister(&retu_wdt_driver);
+	wait_for_completion(&retu_wdt_completion);
+
+	return ret;
+}
+
+static void __exit retu_wdt_exit(void)
+{
+	platform_device_unregister(&retu_wdt_device);
+	driver_unregister(&retu_wdt_driver);
+
+	wait_for_completion(&retu_wdt_completion);
+}
+
+module_init(retu_wdt_init);
+module_exit(retu_wdt_exit);
+module_param(counter_param, int, 0);
+
+MODULE_DESCRIPTION("Retu WatchDog");
+MODULE_AUTHOR("Amit Kucheria");
+MODULE_LICENSE("GPL");
+