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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/rtc/rtc-ds1672.c
....@@ -1,12 +1,9 @@
1
+// SPDX-License-Identifier: GPL-2.0
12 /*
23  * An rtc/i2c driver for the Dallas DS1672
34  * Copyright 2005-06 Tower Technologies
45  *
56  * Author: Alessandro Zummo <a.zummo@towertech.it>
6
- *
7
- * This program is free software; you can redistribute it and/or modify
8
- * it under the terms of the GNU General Public License version 2 as
9
- * published by the Free Software Foundation.
107  */
118 
129 #include <linux/i2c.h>
....@@ -21,17 +18,16 @@
2118 
2219 #define DS1672_REG_CONTROL_EOSC	0x80
2320 
24
-static struct i2c_driver ds1672_driver;
25
-
2621 /*
2722  * In the routines that deal directly with the ds1672 hardware, we use
2823  * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
29
- * Epoch is initialized as 2000. Time is set to UTC.
24
+ * Time is set to UTC.
3025  */
31
-static int ds1672_get_datetime(struct i2c_client *client, struct rtc_time *tm)
26
+static int ds1672_read_time(struct device *dev, struct rtc_time *tm)
3227 {
28
+	struct i2c_client *client = to_i2c_client(dev);
3329 	unsigned long time;
34
-	unsigned char addr = DS1672_REG_CNT_BASE;
30
+	unsigned char addr = DS1672_REG_CONTROL;
3531 	unsigned char buf[4];
3632 
3733 	struct i2c_msg msgs[] = {
....@@ -43,10 +39,24 @@
4339 		{/* read date */
4440 			.addr = client->addr,
4541 			.flags = I2C_M_RD,
46
-			.len = 4,
42
+			.len = 1,
4743 			.buf = buf
4844 		},
4945 	};
46
+
47
+	/* read control register */
48
+	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
49
+		dev_warn(&client->dev, "Unable to read the control register\n");
50
+		return -EIO;
51
+	}
52
+
53
+	if (buf[0] & DS1672_REG_CONTROL_EOSC) {
54
+		dev_warn(&client->dev, "Oscillator not enabled. Set time to enable.\n");
55
+		return -EINVAL;
56
+	}
57
+
58
+	addr = DS1672_REG_CNT_BASE;
59
+	msgs[1].len = 4;
5060 
5161 	/* read date registers */
5262 	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
....@@ -61,20 +71,19 @@
6171 	time = ((unsigned long)buf[3] << 24) | (buf[2] << 16) |
6272 	       (buf[1] << 8) | buf[0];
6373 
64
-	rtc_time_to_tm(time, tm);
74
+	rtc_time64_to_tm(time, tm);
6575 
66
-	dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
67
-		"mday=%d, mon=%d, year=%d, wday=%d\n",
68
-		__func__, tm->tm_sec, tm->tm_min, tm->tm_hour,
69
-		tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
76
+	dev_dbg(&client->dev, "%s: tm is %ptR\n", __func__, tm);
7077 
7178 	return 0;
7279 }
7380 
74
-static int ds1672_set_mmss(struct i2c_client *client, unsigned long secs)
81
+static int ds1672_set_time(struct device *dev, struct rtc_time *tm)
7582 {
83
+	struct i2c_client *client = to_i2c_client(dev);
7684 	int xfer;
7785 	unsigned char buf[6];
86
+	unsigned long secs = rtc_tm_to_time64(tm);
7887 
7988 	buf[0] = DS1672_REG_CNT_BASE;
8089 	buf[1] = secs & 0x000000FF;
....@@ -92,71 +101,15 @@
92101 	return 0;
93102 }
94103 
95
-static int ds1672_rtc_read_time(struct device *dev, struct rtc_time *tm)
96
-{
97
-	return ds1672_get_datetime(to_i2c_client(dev), tm);
98
-}
99
-
100
-static int ds1672_rtc_set_mmss(struct device *dev, unsigned long secs)
101
-{
102
-	return ds1672_set_mmss(to_i2c_client(dev), secs);
103
-}
104
-
105
-static int ds1672_get_control(struct i2c_client *client, u8 *status)
106
-{
107
-	unsigned char addr = DS1672_REG_CONTROL;
108
-
109
-	struct i2c_msg msgs[] = {
110
-		{/* setup read ptr */
111
-			.addr = client->addr,
112
-			.len = 1,
113
-			.buf = &addr
114
-		},
115
-		{/* read control */
116
-			.addr = client->addr,
117
-			.flags = I2C_M_RD,
118
-			.len = 1,
119
-			.buf = status
120
-		},
121
-	};
122
-
123
-	/* read control register */
124
-	if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
125
-		dev_err(&client->dev, "%s: read error\n", __func__);
126
-		return -EIO;
127
-	}
128
-
129
-	return 0;
130
-}
131
-
132
-/* following are the sysfs callback functions */
133
-static ssize_t show_control(struct device *dev, struct device_attribute *attr,
134
-			    char *buf)
135
-{
136
-	struct i2c_client *client = to_i2c_client(dev);
137
-	u8 control;
138
-	int err;
139
-
140
-	err = ds1672_get_control(client, &control);
141
-	if (err)
142
-		return err;
143
-
144
-	return sprintf(buf, "%s\n", (control & DS1672_REG_CONTROL_EOSC)
145
-		       ? "disabled" : "enabled");
146
-}
147
-
148
-static DEVICE_ATTR(control, S_IRUGO, show_control, NULL);
149
-
150104 static const struct rtc_class_ops ds1672_rtc_ops = {
151
-	.read_time = ds1672_rtc_read_time,
152
-	.set_mmss = ds1672_rtc_set_mmss,
105
+	.read_time = ds1672_read_time,
106
+	.set_time = ds1672_set_time,
153107 };
154108 
155109 static int ds1672_probe(struct i2c_client *client,
156110 			const struct i2c_device_id *id)
157111 {
158112 	int err = 0;
159
-	u8 control;
160113 	struct rtc_device *rtc;
161114 
162115 	dev_dbg(&client->dev, "%s\n", __func__);
....@@ -164,29 +117,18 @@
164117 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
165118 		return -ENODEV;
166119 
167
-	rtc = devm_rtc_device_register(&client->dev, ds1672_driver.driver.name,
168
-				  &ds1672_rtc_ops, THIS_MODULE);
169
-
120
+	rtc = devm_rtc_allocate_device(&client->dev);
170121 	if (IS_ERR(rtc))
171122 		return PTR_ERR(rtc);
172123 
173
-	i2c_set_clientdata(client, rtc);
124
+	rtc->ops = &ds1672_rtc_ops;
125
+	rtc->range_max = U32_MAX;
174126 
175
-	/* read control register */
176
-	err = ds1672_get_control(client, &control);
177
-	if (err) {
178
-		dev_warn(&client->dev, "Unable to read the control register\n");
179
-	}
180
-
181
-	if (control & DS1672_REG_CONTROL_EOSC)
182
-		dev_warn(&client->dev, "Oscillator not enabled. "
183
-			 "Set time to enable.\n");
184
-
185
-	/* Register sysfs hooks */
186
-	err = device_create_file(&client->dev, &dev_attr_control);
127
+	err = rtc_register_device(rtc);
187128 	if (err)
188
-		dev_err(&client->dev, "Unable to create sysfs entry: %s\n",
189
-			dev_attr_control.attr.name);
129
+		return err;
130
+
131
+	i2c_set_clientdata(client, rtc);
190132 
191133 	return 0;
192134 }