1 files changed, 40 insertions, 98 deletions

diff --git a/drivers/rtc/rtc-ds1672.c b/drivers/rtc/rtc-ds1672.c
index 9caaccccaa57..6e5314215d00 100644
--- a/drivers/rtc/rtc-ds1672.c
+++ b/drivers/rtc/rtc-ds1672.c
@@ -1,12 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * An rtc/i2c driver for the Dallas DS1672
  * Copyright 2005-06 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/i2c.h>
@@ -21,17 +18,16 @@
 
 #define DS1672_REG_CONTROL_EOSC	0x80
 
-static struct i2c_driver ds1672_driver;
-
 /*
  * In the routines that deal directly with the ds1672 hardware, we use
  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
- * Epoch is initialized as 2000. Time is set to UTC.
+ * Time is set to UTC.
  */
-static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
+static int ds1672_read_time(struct device *dev, struct rtc_time *tm)
 {
+	struct i2c_client *client = to_i2c_client(dev);
 	unsigned long time;
-	unsigned char addr = DS1672_REG_CNT_BASE;
+	unsigned char addr = DS1672_REG_CONTROL;
 	unsigned char buf[4];
 
 	struct i2c_msg msgs[] = {
@@ -43,11 +39,25 @@ static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 		{/* read date */
 			.addr = client->addr,
 			.flags = I2C_M_RD,
-			.len = 4,
+			.len = 1,
 			.buf = buf
 		},
 	};
 
+	/* read control register */
+	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
+		dev_warn(&client->dev, "Unable to read the control register\n");
+		return -EIO;
+	}
+
+	if (buf[0] & DS1672_REG_CONTROL_EOSC) {
+		dev_warn(&client->dev, "Oscillator not enabled. Set time to enable.\n");
+		return -EINVAL;
+	}
+
+	addr = DS1672_REG_CNT_BASE;
+	msgs[1].len = 4;
+
 	/* read date registers */
 	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
 		dev_err(&client->dev, "%s: read error\n", __func__);
@@ -58,22 +68,22 @@ static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
 		"%s: raw read data - counters=%02x,%02x,%02x,%02x\n",
 		__func__, buf[0], buf[1], buf[2], buf[3]);
 
-	time = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+	time = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
+	       (buf[1] << 8) | buf[0];
 
-	rtc_time_to_tm(time, tm);
+	rtc_time64_to_tm(time, tm);
 
-	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
-		"mday=%d, mon=%d, year=%d, wday=%d\n",
-		__func__, tm->tm_sec, tm->tm_min, tm->tm_hour,
-		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
+	dev_dbg(&client->dev, "%s: tm is %ptR\n", __func__, tm);
 
 	return 0;
 }
 
-static int ds1672_set_mmss(struct i2c_client *client, unsigned long secs)
+static int ds1672_set_time(struct device *dev, struct rtc_time *tm)
 {
+	struct i2c_client *client = to_i2c_client(dev);
 	int xfer;
 	unsigned char buf[6];
+	unsigned long secs = rtc_tm_to_time64(tm);
 
 	buf[0] = DS1672_REG_CNT_BASE;
 	buf[1] = secs & 0x000000FF;
@@ -91,71 +101,14 @@ static int ds1672_set_mmss(struct i2c_client *client, unsigned long secs)
 	return 0;
 }
 
-static int ds1672_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
-	return ds1672_get_datetime(to_i2c_client(dev), tm);
-}
-
-static int ds1672_rtc_set_mmss(struct device *dev, unsigned long secs)
-{
-	return ds1672_set_mmss(to_i2c_client(dev), secs);
-}
-
-static int ds1672_get_control(struct i2c_client *client, u8 *status)
-{
-	unsigned char addr = DS1672_REG_CONTROL;
-
-	struct i2c_msg msgs[] = {
-		{/* setup read ptr */
-			.addr = client->addr,
-			.len = 1,
-			.buf = &addr
-		},
-		{/* read control */
-			.addr = client->addr,
-			.flags = I2C_M_RD,
-			.len = 1,
-			.buf = status
-		},
-	};
-
-	/* read control register */
-	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
-		dev_err(&client->dev, "%s: read error\n", __func__);
-		return -EIO;
-	}
-
-	return 0;
-}
-
-/* following are the sysfs callback functions */
-static ssize_t show_control(struct device *dev, struct device_attribute *attr,
-			    char *buf)
-{
-	struct i2c_client *client = to_i2c_client(dev);
-	u8 control;
-	int err;
-
-	err = ds1672_get_control(client, &control);
-	if (err)
-		return err;
-
-	return sprintf(buf, "%s\n", (control & DS1672_REG_CONTROL_EOSC)
-		       ? "disabled" : "enabled");
-}
-
-static DEVICE_ATTR(control, S_IRUGO, show_control, NULL);
-
 static const struct rtc_class_ops ds1672_rtc_ops = {
-	.read_time = ds1672_rtc_read_time,
-	.set_mmss = ds1672_rtc_set_mmss,
+	.read_time = ds1672_read_time,
+	.set_time = ds1672_set_time,
 };
 
-static int ds1672_probe(struct i2c_client *client,
-			const struct i2c_device_id *id)
+static int ds1672_probe(struct i2c_client *client)
 {
 	int err = 0;
-	u8 control;
 	struct rtc_device *rtc;
 
 	dev_dbg(&client->dev, "%s\n", __func__);
@@ -163,40 +116,29 @@ static int ds1672_probe(struct i2c_client *client,
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
 		return -ENODEV;
 
-	rtc = devm_rtc_device_register(&client->dev, ds1672_driver.driver.name,
-				  &ds1672_rtc_ops, THIS_MODULE);
-
+	rtc = devm_rtc_allocate_device(&client->dev);
 	if (IS_ERR(rtc))
 		return PTR_ERR(rtc);
 
-	i2c_set_clientdata(client, rtc);
-
-	/* read control register */
-	err = ds1672_get_control(client, &control);
-	if (err) {
-		dev_warn(&client->dev, "Unable to read the control register\n");
-	}
-
-	if (control & DS1672_REG_CONTROL_EOSC)
-		dev_warn(&client->dev, "Oscillator not enabled. "
-			 "Set time to enable.\n");
+	rtc->ops = &ds1672_rtc_ops;
+	rtc->range_max = U32_MAX;
 
-	/* Register sysfs hooks */
-	err = device_create_file(&client->dev, &dev_attr_control);
+	err = devm_rtc_register_device(rtc);
 	if (err)
-		dev_err(&client->dev, "Unable to create sysfs entry: %s\n",
-			dev_attr_control.attr.name);
+		return err;
+
+	i2c_set_clientdata(client, rtc);
 
 	return 0;
 }
 
 static const struct i2c_device_id ds1672_id[] = {
-	{ "ds1672", 0 },
+	{ "ds1672" },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ds1672_id);
 
-static const struct of_device_id ds1672_of_match[] = {
+static const __maybe_unused struct of_device_id ds1672_of_match[] = {
 	{ .compatible = "dallas,ds1672" },
 	{ }
 };
@@ -207,7 +149,7 @@ static struct i2c_driver ds1672_driver = {
 		   .name = "rtc-ds1672",
 		   .of_match_table = of_match_ptr(ds1672_of_match),
 	},
-	.probe = &ds1672_probe,
+	.probe = ds1672_probe,
 	.id_table = ds1672_id,
 };