[PATCH] RTC subsystem: test device/driver

Interrupts can be generated by

echo "alarm|tick|update" >/sys/class/rtc/rtcX/device/irq
Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/rtc/Kconfig

@@ -86,4 +86,19 @@ config RTC_DRV_X1205
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-x1205.
 
+config RTC_DRV_TEST
+	tristate "Test driver/device"
+	depends on RTC_CLASS
+	help
+	  If you say yes here you get support for the
+	  RTC test driver. It's a software RTC which can be
+	  used to test the RTC subsystem APIs. It gets
+	  the time from the system clock.
+	  You want this driver only if you are doing development
+	  on the RTC subsystem. Please read the source code
+	  for further details.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-test.
+
 endmenu

drivers/rtc/Makefile

@@ -12,4 +12,5 @@ obj-$(CONFIG_RTC_INTF_PROC)	+= rtc-proc.o
 obj-$(CONFIG_RTC_INTF_DEV)	+= rtc-dev.o
 
 obj-$(CONFIG_RTC_DRV_X1205)	+= rtc-x1205.o
+obj-$(CONFIG_RTC_DRV_TEST)	+= rtc-test.o
 

drivers/rtc/rtc-test.c

+/*
+ * An RTC test device/driver
+ * Copyright (C) 2005 Tower Technologies
+ * Author: Alessandro Zummo <a.zummo@towertech.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+
+static struct platform_device *test0 = NULL, *test1 = NULL;
+
+static int test_rtc_read_alarm(struct device *dev,
+	struct rtc_wkalrm *alrm)
+{
+	return 0;
+}
+
+static int test_rtc_set_alarm(struct device *dev,
+	struct rtc_wkalrm *alrm)
+{
+	return 0;
+}
+
+static int test_rtc_read_time(struct device *dev,
+	struct rtc_time *tm)
+{
+	rtc_time_to_tm(get_seconds(), tm);
+	return 0;
+}
+
+static int test_rtc_set_time(struct device *dev,
+	struct rtc_time *tm)
+{
+	return 0;
+}
+
+static int test_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+	return 0;
+}
+
+static int test_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+	struct platform_device *plat_dev = to_platform_device(dev);
+
+	seq_printf(seq, "24hr\t\t: yes\n");
+	seq_printf(seq, "test\t\t: yes\n");
+	seq_printf(seq, "id\t\t: %d\n", plat_dev->id);
+
+	return 0;
+}
+
+static int test_rtc_ioctl(struct device *dev, unsigned int cmd,
+	unsigned long arg)
+{
+	/* We do support interrupts, they're generated
+	 * using the sysfs interface.
+	 */
+	switch (cmd) {
+	case RTC_PIE_ON:
+	case RTC_PIE_OFF:
+	case RTC_UIE_ON:
+	case RTC_UIE_OFF:
+	case RTC_AIE_ON:
+	case RTC_AIE_OFF:
+		return 0;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+static struct rtc_class_ops test_rtc_ops = {
+	.proc = test_rtc_proc,
+	.read_time = test_rtc_read_time,
+	.set_time = test_rtc_set_time,
+	.read_alarm = test_rtc_read_alarm,
+	.set_alarm = test_rtc_set_alarm,
+	.set_mmss = test_rtc_set_mmss,
+	.ioctl = test_rtc_ioctl,
+};
+
+static ssize_t test_irq_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", 42);
+}
+static ssize_t test_irq_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	int retval;
+	struct platform_device *plat_dev = to_platform_device(dev);
+	struct rtc_device *rtc = platform_get_drvdata(plat_dev);
+
+	retval = count;
+	if (strncmp(buf, "tick", 4) == 0)
+		rtc_update_irq(&rtc->class_dev, 1, RTC_PF | RTC_IRQF);
+	else if (strncmp(buf, "alarm", 5) == 0)
+		rtc_update_irq(&rtc->class_dev, 1, RTC_AF | RTC_IRQF);
+	else if (strncmp(buf, "update", 6) == 0)
+		rtc_update_irq(&rtc->class_dev, 1, RTC_UF | RTC_IRQF);
+	else
+		retval = -EINVAL;
+
+	return retval;
+}
+static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, test_irq_show, test_irq_store);
+
+static int test_probe(struct platform_device *plat_dev)
+{
+	int err;
+	struct rtc_device *rtc = rtc_device_register("test", &plat_dev->dev,
+						&test_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc)) {
+		err = PTR_ERR(rtc);
+		dev_err(&plat_dev->dev,
+			"unable to register the class device\n");
+		return err;
+	}
+	device_create_file(&plat_dev->dev, &dev_attr_irq);
+
+	platform_set_drvdata(plat_dev, rtc);
+
+	return 0;
+}
+
+static int __devexit test_remove(struct platform_device *plat_dev)
+{
+	struct rtc_device *rtc = platform_get_drvdata(plat_dev);
+
+	rtc_device_unregister(rtc);
+	device_remove_file(&plat_dev->dev, &dev_attr_irq);
+
+	return 0;
+}
+
+static struct platform_driver test_drv = {
+	.probe	= test_probe,
+	.remove = __devexit_p(test_remove),
+	.driver = {
+		.name = "rtc-test",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init test_init(void)
+{
+	int err;
+
+	if ((err = platform_driver_register(&test_drv)))
+		return err;
+
+	if ((test0 = platform_device_alloc("rtc-test", 0)) == NULL) {
+		err = -ENOMEM;
+		goto exit_driver_unregister;
+	}
+
+	if ((test1 = platform_device_alloc("rtc-test", 1)) == NULL) {
+		err = -ENOMEM;
+		goto exit_free_test0;
+	}
+
+	if ((err = platform_device_add(test0)))
+		goto exit_free_test1;
+
+	if ((err = platform_device_add(test1)))
+		goto exit_device_unregister;
+
+	return 0;
+
+exit_device_unregister:
+	platform_device_unregister(test0);
+
+exit_free_test1:
+	platform_device_put(test1);
+
+exit_free_test0:
+	platform_device_put(test0);
+
+exit_driver_unregister:
+	platform_driver_unregister(&test_drv);
+	return err;
+}
+
+static void __exit test_exit(void)
+{
+	platform_device_unregister(test0);
+	platform_device_unregister(test1);
+	platform_driver_unregister(&test_drv);
+}
+
+MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
+MODULE_DESCRIPTION("RTC test driver/device");
+MODULE_LICENSE("GPL");
+
+module_init(test_init);
+module_exit(test_exit);