2 files changed, 168 insertions(+)
 create mode 100644 rtc-max6916.c
 create mode 100644 txtfile

diff --git a/rtc-max6916.c b/rtc-max6916.c
new file mode 100644
index 0000000..7fabaa2
--- /dev/null
+++ b/rtc-max6916.c

@@ -0,0 +1,157 @@
+/* rtc-max6916.c
+ *
+ * Driver for MAXIM  max6916 Low Current, SPI Compatible
+ * Real Time Clock
+ *
+ * Author : Venkat Prashanth B U <venkat.prashanth2498@gmail.com>
+ *
+ * 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/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/spi/spi.h>
+#include <linux/bcd.h>
+
+/* Registers in max6916 rtc */
+
+#define MAX6916_SECONDS_REG	0x01
+#define MAX6916_MINUTES_REG	0x02
+#define MAX6916_HOURS_REG	0x03
+#define MAX6916_DATE_REG	0x04
+#define MAX6916_MONTH_REG	0x05
+#define MAX6916_DAY_REG	0x06
+#define MAX6916_YEAR_REG	0x07
+#define MAX6916_CONTROL_REG	0x08
+#define MAX6916_STATUS_REG	0x0C
+#define MAX6916_CLOCK_BURST	0x00
+#define ADDRESS_REG            0x70
+#define DATA_REG               0x71
+#define ADDRESS_REG_MASK       0xe0
+
+static unsigned char get_rtc(unsigned char addr)
+{
+	outb(addr, ADDRESS_REG);
+	return inb(DATA_REG);

+
+	buf[7] = bcd2bin(dt->tm_year);
+	buf[8] = bcd2bin(0x00);
+
+	/* write the rtc settings */
+	return spi_write_then_read(spi, buf, 9, NULL, 0);
+}
+
+static const struct rtc_class_ops max6916_rtc_ops = {
+	.read_time = max6916_read_time,
+	.set_time = max6916_set_time,
+};
+
+static int max6916_probe(struct spi_device *spi)
+{
+	struct rtc_device *rtc;
+	unsigned char data;
+	int res;
+
+	/* spi setup with max6916 in mode 3 and bits per word as 8 */
+	spi->mode = SPI_MODE_3;
+	spi->bits_per_word = 8;
+	spi_setup(spi);
+
+	/* RTC Settings */
+	res = max6916_read_reg(&spi->dev, MAX6916_SECONDS_REG, &data);
+	if (res)
+	return res;
+	/* Disable the write protect of rtc */
+	max6916_read_reg(&spi->dev, MAX6916_CONTROL_REG, &data);
+	data = data & ~(1<<7);
+	max6916_write_reg(&spi->dev, MAX6916_CONTROL_REG, data);
+	/* Enable the oscillator , disable the oscillator stop flag,
+	 and glitch filter to reduce current consumption */
+	max6916_read_reg(&spi->dev, MAX6916_STATUS_REG, &data);
+	data = data & 0x1B;
+	max6916_write_reg(&spi->dev, MAX6916_STATUS_REG, data);
+	/* display the settings */
+	max6916_read_reg(&spi->dev, MAX6916_CONTROL_REG, &data);
+	dev_info(&spi->dev, "MAX6916 RTC CTRL Reg = 0x%02x\n", data);
+	max6916_read_reg(&spi->dev, MAX6916_STATUS_REG, &data);
+	dev_info(&spi->dev, "MAX6916 RTC Status Reg = 0x%02x\n", data);
+	rtc = devm_rtc_device_register(&spi->dev, "max6916",&max6916_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc))
+	return PTR_ERR(rtc);
+	spi_set_drvdata(spi, rtc);
+
+	return 0;
+}
+static struct spi_driver max6916_driver = {
+	.driver = {
+	.name = "max6916",
+	},
+	.probe = max6916_probe,
+};
+static void __exit rtc_exit(void)
+{
+	pr_info("rtc module unloaded\n");
+}
+
+module_spi_driver(max6916_driver);
+MODULE_DESCRIPTION("MAX6916 SPI RTC DRIVER");
+MODULE_AUTHOR("Venkat Prashanth B U [off-list ref]");
+MODULE_LICENSE("GPL v2");

diff --git a/txtfile b/txtfile
new file mode 100644
index 0000000..1604409
--- /dev/null
+++ b/txtfile

@@ -0,0 +1,11 @@
+config RTC_DRV_MAX6916
+tristate "Maxim MAX6916"
+
+help 
+  If you say yes here you get support for the 
+  Maxim MAX6916 chips. 
+  This driver only supports the RTC feature, and not other chip
+  features such as alarms.
+  This driver can also be built as a module. If so, the module
+  will be called rtc‐max6916.