parisc: add rtc platform driver

Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>

1 files changed, 111 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-parisc.c b/drivers/rtc/rtc-parisc.c
new file mode 100644
index 000000000000..346d633655e7
--- /dev/null
+++ b/drivers/rtc/rtc-parisc.c
@@ -0,0 +1,111 @@
+/* rtc-parisc: RTC for HP PA-RISC firmware
+ *
+ * Copyright (C) 2008 Kyle McMartin <kyle@mcmartin.ca>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/time.h>
+#include <linux/platform_device.h>
+
+#include <asm/rtc.h>
+
+/* as simple as can be, and no simpler. */
+struct parisc_rtc {
+        struct rtc_device *rtc;
+        spinlock_t lock;
+};
+
+static int parisc_get_time(struct device *dev, struct rtc_time *tm)
+{
+        struct parisc_rtc *p = dev_get_drvdata(dev);
+        unsigned long flags, ret;
+
+        spin_lock_irqsave(&p->lock, flags);
+        ret = get_rtc_time(tm);
+        spin_unlock_irqrestore(&p->lock, flags);
+
+        if (ret & RTC_BATT_BAD)
+                return -EOPNOTSUPP;
+
+        return 0;
+}
+
+static int parisc_set_time(struct device *dev, struct rtc_time *tm)
+{
+        struct parisc_rtc *p = dev_get_drvdata(dev);
+        unsigned long flags, ret;
+
+        spin_lock_irqsave(&p->lock, flags);
+        ret = set_rtc_time(tm);
+        spin_unlock_irqrestore(&p->lock, flags);
+
+        if (ret < 0)
+                return -EOPNOTSUPP;
+
+        return 0;
+}
+
+static const struct rtc_class_ops parisc_rtc_ops = {
+        .read_time = parisc_get_time,
+        .set_time = parisc_set_time,
+};
+
+static int __devinit parisc_rtc_probe(struct platform_device *dev)
+{
+        struct parisc_rtc *p;
+
+        p = kzalloc(sizeof (*p), GFP_KERNEL);
+        if (!p)
+                return -ENOMEM;
+
+        spin_lock_init(&p->lock);
+
+        p->rtc = rtc_device_register("rtc-parisc", &dev->dev, &parisc_rtc_ops,
+                                        THIS_MODULE);
+        if (IS_ERR(p->rtc)) {
+                int err = PTR_ERR(p->rtc);
+                kfree(p);
+                return err;
+        }
+
+        platform_set_drvdata(dev, p);
+
+        return 0;
+}
+
+static int __devexit parisc_rtc_remove(struct platform_device *dev)
+{
+        struct parisc_rtc *p = platform_get_drvdata(dev);
+
+        rtc_device_unregister(p->rtc);
+        kfree(p);
+
+        return 0;
+}
+
+static struct platform_driver parisc_rtc_driver = {
+        .driver = {
+                .name = "rtc-parisc",
+                .owner = THIS_MODULE,
+        },
+        .probe = parisc_rtc_probe,
+        .remove = __devexit_p(parisc_rtc_remove),
+};
+
+static int __init parisc_rtc_init(void)
+{
+        return platform_driver_register(&parisc_rtc_driver);
+}
+
+static void __exit parisc_rtc_fini(void)
+{
+        platform_driver_unregister(&parisc_rtc_driver);
+}
+
+module_init(parisc_rtc_init);
+module_exit(parisc_rtc_fini);
+
+MODULE_AUTHOR("Kyle McMartin <kyle@mcmartin.ca>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("HP PA-RISC RTC driver");