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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> |
19 | #include <linux/m48t86.h> |
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 |
26 | #define M48T86_REG_HOUR 0x04 |
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 | |
42 | #define DRV_VERSION "0.1" |
43 | |
44 | |
45 | static int m48t86_rtc_read_time(struct device *dev, struct rtc_time *tm) |
46 | { |
47 | unsigned char reg; |
48 | struct platform_device *pdev = to_platform_device(dev); |
49 | struct m48t86_ops *ops = pdev->dev.platform_data; |
50 | |
51 | reg = ops->readbyte(M48T86_REG_B); |
52 | |
53 | if (reg & M48T86_REG_B_DM) { |
54 | /* data (binary) mode */ |
55 | tm->tm_sec = ops->readbyte(M48T86_REG_SEC); |
56 | tm->tm_min = ops->readbyte(M48T86_REG_MIN); |
57 | tm->tm_hour = ops->readbyte(M48T86_REG_HOUR) & 0x3F; |
58 | tm->tm_mday = ops->readbyte(M48T86_REG_DOM); |
59 | /* tm_mon is 0-11 */ |
60 | tm->tm_mon = ops->readbyte(M48T86_REG_MONTH) - 1; |
61 | tm->tm_year = ops->readbyte(M48T86_REG_YEAR) + 100; |
62 | tm->tm_wday = ops->readbyte(M48T86_REG_DOW); |
63 | } else { |
64 | /* bcd mode */ |
65 | tm->tm_sec = bcd2bin(ops->readbyte(M48T86_REG_SEC)); |
66 | tm->tm_min = bcd2bin(ops->readbyte(M48T86_REG_MIN)); |
67 | tm->tm_hour = bcd2bin(ops->readbyte(M48T86_REG_HOUR) & 0x3F); |
68 | tm->tm_mday = bcd2bin(ops->readbyte(M48T86_REG_DOM)); |
69 | /* tm_mon is 0-11 */ |
70 | tm->tm_mon = bcd2bin(ops->readbyte(M48T86_REG_MONTH)) - 1; |
71 | tm->tm_year = bcd2bin(ops->readbyte(M48T86_REG_YEAR)) + 100; |
72 | tm->tm_wday = bcd2bin(ops->readbyte(M48T86_REG_DOW)); |
73 | } |
74 | |
75 | /* correct the hour if the clock is in 12h mode */ |
76 | if (!(reg & M48T86_REG_B_H24)) |
77 | if (ops->readbyte(M48T86_REG_HOUR) & 0x80) |
78 | tm->tm_hour += 12; |
79 | |
80 | return rtc_valid_tm(tm); |
81 | } |
82 | |
83 | static int m48t86_rtc_set_time(struct device *dev, struct rtc_time *tm) |
84 | { |
85 | unsigned char reg; |
86 | struct platform_device *pdev = to_platform_device(dev); |
87 | struct m48t86_ops *ops = pdev->dev.platform_data; |
88 | |
89 | reg = ops->readbyte(M48T86_REG_B); |
90 | |
91 | /* update flag and 24h mode */ |
92 | reg |= M48T86_REG_B_SET | M48T86_REG_B_H24; |
93 | ops->writebyte(reg, M48T86_REG_B); |
94 | |
95 | if (reg & M48T86_REG_B_DM) { |
96 | /* data (binary) mode */ |
97 | ops->writebyte(tm->tm_sec, M48T86_REG_SEC); |
98 | ops->writebyte(tm->tm_min, M48T86_REG_MIN); |
99 | ops->writebyte(tm->tm_hour, M48T86_REG_HOUR); |
100 | ops->writebyte(tm->tm_mday, M48T86_REG_DOM); |
101 | ops->writebyte(tm->tm_mon + 1, M48T86_REG_MONTH); |
102 | ops->writebyte(tm->tm_year % 100, M48T86_REG_YEAR); |
103 | ops->writebyte(tm->tm_wday, M48T86_REG_DOW); |
104 | } else { |
105 | /* bcd mode */ |
106 | ops->writebyte(bin2bcd(tm->tm_sec), M48T86_REG_SEC); |
107 | ops->writebyte(bin2bcd(tm->tm_min), M48T86_REG_MIN); |
108 | ops->writebyte(bin2bcd(tm->tm_hour), M48T86_REG_HOUR); |
109 | ops->writebyte(bin2bcd(tm->tm_mday), M48T86_REG_DOM); |
110 | ops->writebyte(bin2bcd(tm->tm_mon + 1), M48T86_REG_MONTH); |
111 | ops->writebyte(bin2bcd(tm->tm_year % 100), M48T86_REG_YEAR); |
112 | ops->writebyte(bin2bcd(tm->tm_wday), M48T86_REG_DOW); |
113 | } |
114 | |
115 | /* update ended */ |
116 | reg &= ~M48T86_REG_B_SET; |
117 | ops->writebyte(reg, M48T86_REG_B); |
118 | |
119 | return 0; |
120 | } |
121 | |
122 | static int m48t86_rtc_proc(struct device *dev, struct seq_file *seq) |
123 | { |
124 | unsigned char reg; |
125 | struct platform_device *pdev = to_platform_device(dev); |
126 | struct m48t86_ops *ops = pdev->dev.platform_data; |
127 | |
128 | reg = ops->readbyte(M48T86_REG_B); |
129 | |
130 | seq_printf(seq, "mode\t\t: %s\n", |
131 | (reg & M48T86_REG_B_DM) ? "binary" : "bcd"); |
132 | |
133 | reg = ops->readbyte(M48T86_REG_D); |
134 | |
135 | seq_printf(seq, "battery\t\t: %s\n", |
136 | (reg & M48T86_REG_D_VRT) ? "ok" : "exhausted"); |
137 | |
138 | return 0; |
139 | } |
140 | |
141 | static const struct rtc_class_ops m48t86_rtc_ops = { |
142 | .read_time = m48t86_rtc_read_time, |
143 | .set_time = m48t86_rtc_set_time, |
144 | .proc = m48t86_rtc_proc, |
145 | }; |
146 | |
147 | static int m48t86_rtc_probe(struct platform_device *dev) |
148 | { |
149 | unsigned char reg; |
150 | struct m48t86_ops *ops = dev->dev.platform_data; |
151 | struct rtc_device *rtc = rtc_device_register("m48t86", |
152 | &dev->dev, &m48t86_rtc_ops, THIS_MODULE); |
153 | |
154 | if (IS_ERR(rtc)) |
155 | return PTR_ERR(rtc); |
156 | |
157 | platform_set_drvdata(dev, rtc); |
158 | |
159 | /* read battery status */ |
160 | reg = ops->readbyte(M48T86_REG_D); |
161 | dev_info(&dev->dev, "battery %s\n", |
162 | (reg & M48T86_REG_D_VRT) ? "ok" : "exhausted"); |
163 | |
164 | return 0; |
165 | } |
166 | |
167 | static int m48t86_rtc_remove(struct platform_device *dev) |
168 | { |
169 | struct rtc_device *rtc = platform_get_drvdata(dev); |
170 | |
171 | if (rtc) |
172 | rtc_device_unregister(rtc); |
173 | |
174 | platform_set_drvdata(dev, NULL); |
175 | |
176 | return 0; |
177 | } |
178 | |
179 | static struct platform_driver m48t86_rtc_platform_driver = { |
180 | .driver = { |
181 | .name = "rtc-m48t86", |
182 | .owner = THIS_MODULE, |
183 | }, |
184 | .probe = m48t86_rtc_probe, |
185 | .remove = m48t86_rtc_remove, |
186 | }; |
187 | |
188 | module_platform_driver(m48t86_rtc_platform_driver); |
189 | |
190 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); |
191 | MODULE_DESCRIPTION("M48T86 RTC driver"); |
192 | MODULE_LICENSE("GPL"); |
193 | MODULE_VERSION(DRV_VERSION); |
194 | MODULE_ALIAS("platform:rtc-m48t86"); |
195 |
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