[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>

3 files changed, 220 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 3de823f2f055..7eb1368d04f6 100644
--- a/drivers/rtc/Kconfig
+++ b/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
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index eaf89b22db7a..d5ea0ed81905 100644
--- a/drivers/rtc/Makefile
+++ b/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
 
diff --git a/drivers/rtc/rtc-test.c b/drivers/rtc/rtc-test.c
new file mode 100644
index 000000000000..43d107487820
--- /dev/null
+++ b/drivers/rtc/rtc-test.c
@@ -0,0 +1,204 @@
+/*
+ * 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);