IKXCLOCK-148: Skeleton RTC driver for minnow

Change-Id: Idafd43add6787f8ce752df9a0455db9bd9257ea7
Reviewed-on: http://gerrit.pcs.mot.com/607099
SLTApproved: Slta Waiver <sltawvr@motorola.com>
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Douglas Zobel <dzobel1@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-sensorhub.c b/drivers/rtc/rtc-sensorhub.c
new file mode 100644
index 00000000000..93f71395905
--- /dev/null
+++ b/drivers/rtc/rtc-sensorhub.c
@@ -0,0 +1,158 @@
+/*
+ * RTC device/driver based on SensorHub
+ * Copyright (C) 2014 Motorola Mobility LLC
+ *
+ *
+ * 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 int rtc_sensorhub_rtc_read_alarm(struct device *dev,
+	struct rtc_wkalrm *alrm)
+{
+	/* TODO : implement a real handler*/
+	return 0;
+}
+
+static int rtc_sensorhub_rtc_set_alarm(struct device *dev,
+	struct rtc_wkalrm *alrm)
+{
+	/* TODO : implement a real handler*/
+	return 0;
+}
+
+static int rtc_sensorhub_rtc_read_time(struct device *dev,
+	struct rtc_time *tm)
+{
+	/* TODO : implement a real handler*/
+	rtc_time_to_tm(get_seconds(), tm);
+	return 0;
+}
+
+static int rtc_sensorhub_rtc_set_time(struct device *dev,
+	struct rtc_time *tm)
+{
+	/* TODO : implement a real handler*/
+	pr_err("%s:\n", __func__);
+	return 0;
+}
+
+static int rtc_sensorhub_rtc_set_mmss(struct device *dev, unsigned long secs)
+{
+	/* TODO : implement a real handler*/
+	dev_info(dev, "%s, secs = %lu\n", __func__, secs);
+	return 0;
+}
+
+static int rtc_sensorhub_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+	/* TODO : implement a real handler*/
+	struct platform_device *plat_dev = to_platform_device(dev);
+	char buffer[50];
+	int length;
+
+	seq_puts(seq, "sensorhub\t\t: yes\n");
+
+	length = sprintf(buffer, "id\t\t: %d\n", plat_dev->id);
+	if (length < 49) {
+		buffer[length] = 0;
+		seq_puts(seq, buffer);
+	}
+
+	return 0;
+}
+
+static int rtc_sensorhub_rtc_alarm_irq_enable(struct device *dev,
+					unsigned int enable)
+{
+	/* TODO : implement a real handler*/
+	return 0;
+}
+
+static const struct rtc_class_ops rtc_sensorhub_rtc_ops = {
+	.proc = rtc_sensorhub_rtc_proc,
+	.read_time = rtc_sensorhub_rtc_read_time,
+	.set_time = rtc_sensorhub_rtc_set_time,
+	.read_alarm = rtc_sensorhub_rtc_read_alarm,
+	.set_alarm = rtc_sensorhub_rtc_set_alarm,
+	.set_mmss = rtc_sensorhub_rtc_set_mmss,
+	.alarm_irq_enable = rtc_sensorhub_rtc_alarm_irq_enable,
+};
+
+static ssize_t rtc_sensorhub_irq_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	/* TODO : implement a real handler*/
+	pr_err("%s:\n", __func__);
+	return sprintf(buf, "%d\n", 42);
+}
+static ssize_t rtc_sensorhub_irq_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t count)
+{
+	/* TODO : implement a real handler*/
+	pr_err("%s:\n", __func__);
+	return count;
+}
+
+static DEVICE_ATTR(irq, S_IRUGO | S_IWUSR, rtc_sensorhub_irq_show,
+						rtc_sensorhub_irq_store);
+
+static int rtc_sensorhub_probe(struct platform_device *plat_dev)
+{
+	int err;
+	struct rtc_device *rtc;
+
+	rtc = devm_rtc_device_register(&plat_dev->dev, "rtc_sensorhub",
+				&rtc_sensorhub_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc)) {
+		err = PTR_ERR(rtc);
+		return err;
+	}
+
+	err = device_create_file(&plat_dev->dev, &dev_attr_irq);
+	if (err)
+		goto err;
+
+	platform_set_drvdata(plat_dev, rtc);
+
+	return 0;
+
+err:
+	return err;
+}
+
+static int rtc_sensorhub_remove(struct platform_device *plat_dev)
+{
+	device_remove_file(&plat_dev->dev, &dev_attr_irq);
+
+	return 0;
+}
+
+static const struct of_device_id of_rtc_sensorhub_match[] = {
+	{ .compatible = "mot,rtc_from_sensorhub", },
+	{},
+};
+
+static struct platform_driver rtc_sensorhub_driver = {
+	.probe	= rtc_sensorhub_probe,
+	.remove = rtc_sensorhub_remove,
+	.driver = {
+		.name = "rtc-sensorhub",
+		.owner = THIS_MODULE,
+		.of_match_table = of_rtc_sensorhub_match,
+	},
+};
+
+module_platform_driver(rtc_sensorhub_driver);
+
+MODULE_AUTHOR("Motorola Mobility LLC");
+MODULE_DESCRIPTION("SensorHub RTC driver/device");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rtc_sensorhub");