]>
Commit | Line | Data |
---|---|---|
1d98af87 AZ |
1 | /* |
2 | * ST M48T86 / Dallas DS12887 RTC driver | |
3 | * Copyright (c) 2006 Tower Technologies | |
4 | * | |
5 | * 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. | |
10 | * | |
11 | * This drivers only supports the clock running in BCD and 24H mode. | |
12 | * If it will be ever adapted to binary and 12H mode, care must be taken | |
13 | * to not introduce bugs. | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/rtc.h> | |
18 | #include <linux/platform_device.h> | |
803bb301 | 19 | #include <linux/platform_data/rtc-m48t86.h> |
1d98af87 AZ |
20 | #include <linux/bcd.h> |
21 | ||
22 | #define M48T86_REG_SEC 0x00 | |
23 | #define M48T86_REG_SECALRM 0x01 | |
24 | #define M48T86_REG_MIN 0x02 | |
25 | #define M48T86_REG_MINALRM 0x03 | |
f90a6506 | 26 | #define M48T86_REG_HOUR 0x04 |
1d98af87 AZ |
27 | #define M48T86_REG_HOURALRM 0x05 |
28 | #define M48T86_REG_DOW 0x06 /* 1 = sunday */ | |
29 | #define M48T86_REG_DOM 0x07 | |
30 | #define M48T86_REG_MONTH 0x08 /* 1 - 12 */ | |
31 | #define M48T86_REG_YEAR 0x09 /* 0 - 99 */ | |
32 | #define M48T86_REG_A 0x0A | |
33 | #define M48T86_REG_B 0x0B | |
34 | #define M48T86_REG_C 0x0C | |
35 | #define M48T86_REG_D 0x0D | |
36 | ||
37 | #define M48T86_REG_B_H24 (1 << 1) | |
38 | #define M48T86_REG_B_DM (1 << 2) | |
39 | #define M48T86_REG_B_SET (1 << 7) | |
40 | #define M48T86_REG_D_VRT (1 << 7) | |
41 | ||
1d98af87 AZ |
42 | static int m48t86_rtc_read_time(struct device *dev, struct rtc_time *tm) |
43 | { | |
44 | unsigned char reg; | |
45 | struct platform_device *pdev = to_platform_device(dev); | |
b5f0902d | 46 | struct m48t86_ops *ops = dev_get_platdata(&pdev->dev); |
1d98af87 | 47 | |
2d7b20c1 | 48 | reg = ops->readbyte(M48T86_REG_B); |
1d98af87 AZ |
49 | |
50 | if (reg & M48T86_REG_B_DM) { | |
51 | /* data (binary) mode */ | |
2d7b20c1 AM |
52 | tm->tm_sec = ops->readbyte(M48T86_REG_SEC); |
53 | tm->tm_min = ops->readbyte(M48T86_REG_MIN); | |
54 | tm->tm_hour = ops->readbyte(M48T86_REG_HOUR) & 0x3F; | |
55 | tm->tm_mday = ops->readbyte(M48T86_REG_DOM); | |
1d98af87 | 56 | /* tm_mon is 0-11 */ |
2d7b20c1 AM |
57 | tm->tm_mon = ops->readbyte(M48T86_REG_MONTH) - 1; |
58 | tm->tm_year = ops->readbyte(M48T86_REG_YEAR) + 100; | |
59 | tm->tm_wday = ops->readbyte(M48T86_REG_DOW); | |
1d98af87 AZ |
60 | } else { |
61 | /* bcd mode */ | |
fe20ba70 AB |
62 | tm->tm_sec = bcd2bin(ops->readbyte(M48T86_REG_SEC)); |
63 | tm->tm_min = bcd2bin(ops->readbyte(M48T86_REG_MIN)); | |
64 | tm->tm_hour = bcd2bin(ops->readbyte(M48T86_REG_HOUR) & 0x3F); | |
65 | tm->tm_mday = bcd2bin(ops->readbyte(M48T86_REG_DOM)); | |
1d98af87 | 66 | /* tm_mon is 0-11 */ |
fe20ba70 AB |
67 | tm->tm_mon = bcd2bin(ops->readbyte(M48T86_REG_MONTH)) - 1; |
68 | tm->tm_year = bcd2bin(ops->readbyte(M48T86_REG_YEAR)) + 100; | |
69 | tm->tm_wday = bcd2bin(ops->readbyte(M48T86_REG_DOW)); | |
1d98af87 AZ |
70 | } |
71 | ||
72 | /* correct the hour if the clock is in 12h mode */ | |
73 | if (!(reg & M48T86_REG_B_H24)) | |
2d7b20c1 | 74 | if (ops->readbyte(M48T86_REG_HOUR) & 0x80) |
1d98af87 AZ |
75 | tm->tm_hour += 12; |
76 | ||
52142ed4 | 77 | return rtc_valid_tm(tm); |
1d98af87 AZ |
78 | } |
79 | ||
80 | static int m48t86_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
81 | { | |
82 | unsigned char reg; | |
83 | struct platform_device *pdev = to_platform_device(dev); | |
b5f0902d | 84 | struct m48t86_ops *ops = dev_get_platdata(&pdev->dev); |
1d98af87 | 85 | |
2d7b20c1 | 86 | reg = ops->readbyte(M48T86_REG_B); |
1d98af87 AZ |
87 | |
88 | /* update flag and 24h mode */ | |
89 | reg |= M48T86_REG_B_SET | M48T86_REG_B_H24; | |
2d7b20c1 | 90 | ops->writebyte(reg, M48T86_REG_B); |
1d98af87 AZ |
91 | |
92 | if (reg & M48T86_REG_B_DM) { | |
93 | /* data (binary) mode */ | |
2d7b20c1 AM |
94 | ops->writebyte(tm->tm_sec, M48T86_REG_SEC); |
95 | ops->writebyte(tm->tm_min, M48T86_REG_MIN); | |
96 | ops->writebyte(tm->tm_hour, M48T86_REG_HOUR); | |
97 | ops->writebyte(tm->tm_mday, M48T86_REG_DOM); | |
98 | ops->writebyte(tm->tm_mon + 1, M48T86_REG_MONTH); | |
99 | ops->writebyte(tm->tm_year % 100, M48T86_REG_YEAR); | |
100 | ops->writebyte(tm->tm_wday, M48T86_REG_DOW); | |
1d98af87 AZ |
101 | } else { |
102 | /* bcd mode */ | |
fe20ba70 AB |
103 | ops->writebyte(bin2bcd(tm->tm_sec), M48T86_REG_SEC); |
104 | ops->writebyte(bin2bcd(tm->tm_min), M48T86_REG_MIN); | |
105 | ops->writebyte(bin2bcd(tm->tm_hour), M48T86_REG_HOUR); | |
106 | ops->writebyte(bin2bcd(tm->tm_mday), M48T86_REG_DOM); | |
107 | ops->writebyte(bin2bcd(tm->tm_mon + 1), M48T86_REG_MONTH); | |
108 | ops->writebyte(bin2bcd(tm->tm_year % 100), M48T86_REG_YEAR); | |
109 | ops->writebyte(bin2bcd(tm->tm_wday), M48T86_REG_DOW); | |
1d98af87 AZ |
110 | } |
111 | ||
112 | /* update ended */ | |
113 | reg &= ~M48T86_REG_B_SET; | |
2d7b20c1 | 114 | ops->writebyte(reg, M48T86_REG_B); |
1d98af87 AZ |
115 | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static int m48t86_rtc_proc(struct device *dev, struct seq_file *seq) | |
120 | { | |
121 | unsigned char reg; | |
122 | struct platform_device *pdev = to_platform_device(dev); | |
b5f0902d | 123 | struct m48t86_ops *ops = dev_get_platdata(&pdev->dev); |
1d98af87 | 124 | |
2d7b20c1 | 125 | reg = ops->readbyte(M48T86_REG_B); |
1d98af87 | 126 | |
1d98af87 AZ |
127 | seq_printf(seq, "mode\t\t: %s\n", |
128 | (reg & M48T86_REG_B_DM) ? "binary" : "bcd"); | |
129 | ||
2d7b20c1 | 130 | reg = ops->readbyte(M48T86_REG_D); |
1d98af87 AZ |
131 | |
132 | seq_printf(seq, "battery\t\t: %s\n", | |
133 | (reg & M48T86_REG_D_VRT) ? "ok" : "exhausted"); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
ff8371ac | 138 | static const struct rtc_class_ops m48t86_rtc_ops = { |
1d98af87 AZ |
139 | .read_time = m48t86_rtc_read_time, |
140 | .set_time = m48t86_rtc_set_time, | |
141 | .proc = m48t86_rtc_proc, | |
142 | }; | |
143 | ||
5a167f45 | 144 | static int m48t86_rtc_probe(struct platform_device *dev) |
1d98af87 AZ |
145 | { |
146 | unsigned char reg; | |
b5f0902d | 147 | struct m48t86_ops *ops = dev_get_platdata(&dev->dev); |
d5b6bb0a JH |
148 | struct rtc_device *rtc; |
149 | ||
150 | rtc = devm_rtc_device_register(&dev->dev, "m48t86", | |
151 | &m48t86_rtc_ops, THIS_MODULE); | |
1d98af87 | 152 | |
d1d65b77 | 153 | if (IS_ERR(rtc)) |
1d98af87 | 154 | return PTR_ERR(rtc); |
1d98af87 AZ |
155 | |
156 | platform_set_drvdata(dev, rtc); | |
157 | ||
158 | /* read battery status */ | |
2d7b20c1 | 159 | reg = ops->readbyte(M48T86_REG_D); |
1d98af87 AZ |
160 | dev_info(&dev->dev, "battery %s\n", |
161 | (reg & M48T86_REG_D_VRT) ? "ok" : "exhausted"); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
1d98af87 AZ |
166 | static struct platform_driver m48t86_rtc_platform_driver = { |
167 | .driver = { | |
168 | .name = "rtc-m48t86", | |
1d98af87 AZ |
169 | }, |
170 | .probe = m48t86_rtc_probe, | |
1d98af87 AZ |
171 | }; |
172 | ||
0c4eae66 | 173 | module_platform_driver(m48t86_rtc_platform_driver); |
1d98af87 AZ |
174 | |
175 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
176 | MODULE_DESCRIPTION("M48T86 RTC driver"); | |
177 | MODULE_LICENSE("GPL"); | |
ad28a07b | 178 | MODULE_ALIAS("platform:rtc-m48t86"); |