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1 | /* |
2 | * An I2C driver for the Ricoh RS5C372 RTC | |
3 | * | |
4 | * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net> | |
5 | * Copyright (C) 2006 Tower Technologies | |
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 | ||
12 | #include <linux/i2c.h> | |
13 | #include <linux/rtc.h> | |
14 | #include <linux/bcd.h> | |
15 | ||
16 | #define DRV_VERSION "0.2" | |
17 | ||
18 | /* Addresses to scan */ | |
19 | static unsigned short normal_i2c[] = { /* 0x32,*/ I2C_CLIENT_END }; | |
20 | ||
21 | /* Insmod parameters */ | |
22 | I2C_CLIENT_INSMOD; | |
23 | ||
24 | #define RS5C372_REG_SECS 0 | |
25 | #define RS5C372_REG_MINS 1 | |
26 | #define RS5C372_REG_HOURS 2 | |
27 | #define RS5C372_REG_WDAY 3 | |
28 | #define RS5C372_REG_DAY 4 | |
29 | #define RS5C372_REG_MONTH 5 | |
30 | #define RS5C372_REG_YEAR 6 | |
31 | #define RS5C372_REG_TRIM 7 | |
32 | ||
33 | #define RS5C372_TRIM_XSL 0x80 | |
34 | #define RS5C372_TRIM_MASK 0x7F | |
35 | ||
36 | #define RS5C372_REG_BASE 0 | |
37 | ||
38 | static int rs5c372_attach(struct i2c_adapter *adapter); | |
39 | static int rs5c372_detach(struct i2c_client *client); | |
40 | static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind); | |
41 | ||
42 | static struct i2c_driver rs5c372_driver = { | |
43 | .driver = { | |
44 | .name = "rs5c372", | |
45 | }, | |
46 | .attach_adapter = &rs5c372_attach, | |
47 | .detach_client = &rs5c372_detach, | |
48 | }; | |
49 | ||
50 | static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) | |
51 | { | |
52 | unsigned char buf[7] = { RS5C372_REG_BASE }; | |
53 | ||
54 | /* this implements the 1st reading method, according | |
55 | * to the datasheet. buf[0] is initialized with | |
56 | * address ptr and transmission format register. | |
57 | */ | |
58 | struct i2c_msg msgs[] = { | |
59 | { client->addr, 0, 1, buf }, | |
60 | { client->addr, I2C_M_RD, 7, buf }, | |
61 | }; | |
62 | ||
63 | if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { | |
64 | dev_err(&client->dev, "%s: read error\n", __FUNCTION__); | |
65 | return -EIO; | |
66 | } | |
67 | ||
68 | tm->tm_sec = BCD2BIN(buf[RS5C372_REG_SECS] & 0x7f); | |
69 | tm->tm_min = BCD2BIN(buf[RS5C372_REG_MINS] & 0x7f); | |
70 | tm->tm_hour = BCD2BIN(buf[RS5C372_REG_HOURS] & 0x3f); | |
71 | tm->tm_wday = BCD2BIN(buf[RS5C372_REG_WDAY] & 0x07); | |
72 | tm->tm_mday = BCD2BIN(buf[RS5C372_REG_DAY] & 0x3f); | |
73 | ||
74 | /* tm->tm_mon is zero-based */ | |
75 | tm->tm_mon = BCD2BIN(buf[RS5C372_REG_MONTH] & 0x1f) - 1; | |
76 | ||
77 | /* year is 1900 + tm->tm_year */ | |
78 | tm->tm_year = BCD2BIN(buf[RS5C372_REG_YEAR]) + 100; | |
79 | ||
80 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " | |
81 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
82 | __FUNCTION__, | |
83 | tm->tm_sec, tm->tm_min, tm->tm_hour, | |
84 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
90 | { | |
91 | unsigned char buf[8] = { RS5C372_REG_BASE }; | |
92 | ||
93 | dev_dbg(&client->dev, | |
94 | "%s: secs=%d, mins=%d, hours=%d ", | |
95 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
96 | __FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour, | |
97 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
98 | ||
99 | buf[1] = BIN2BCD(tm->tm_sec); | |
100 | buf[2] = BIN2BCD(tm->tm_min); | |
101 | buf[3] = BIN2BCD(tm->tm_hour); | |
102 | buf[4] = BIN2BCD(tm->tm_wday); | |
103 | buf[5] = BIN2BCD(tm->tm_mday); | |
104 | buf[6] = BIN2BCD(tm->tm_mon + 1); | |
105 | buf[7] = BIN2BCD(tm->tm_year - 100); | |
106 | ||
107 | if ((i2c_master_send(client, buf, 8)) != 8) { | |
108 | dev_err(&client->dev, "%s: write error\n", __FUNCTION__); | |
109 | return -EIO; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) | |
116 | { | |
117 | unsigned char buf = RS5C372_REG_TRIM; | |
118 | ||
119 | struct i2c_msg msgs[] = { | |
120 | { client->addr, 0, 1, &buf }, | |
121 | { client->addr, I2C_M_RD, 1, &buf }, | |
122 | }; | |
123 | ||
124 | if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { | |
125 | dev_err(&client->dev, "%s: read error\n", __FUNCTION__); | |
126 | return -EIO; | |
127 | } | |
128 | ||
129 | dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, trim); | |
130 | ||
131 | if (osc) | |
132 | *osc = (buf & RS5C372_TRIM_XSL) ? 32000 : 32768; | |
133 | ||
134 | if (trim) | |
135 | *trim = buf & RS5C372_TRIM_MASK; | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
141 | { | |
142 | return rs5c372_get_datetime(to_i2c_client(dev), tm); | |
143 | } | |
144 | ||
145 | static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
146 | { | |
147 | return rs5c372_set_datetime(to_i2c_client(dev), tm); | |
148 | } | |
149 | ||
150 | static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) | |
151 | { | |
152 | int err, osc, trim; | |
153 | ||
154 | seq_printf(seq, "24hr\t\t: yes\n"); | |
155 | ||
156 | if ((err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim)) == 0) { | |
157 | seq_printf(seq, "%d.%03d KHz\n", osc / 1000, osc % 1000); | |
158 | seq_printf(seq, "trim\t: %d\n", trim); | |
159 | } | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static struct rtc_class_ops rs5c372_rtc_ops = { | |
165 | .proc = rs5c372_rtc_proc, | |
166 | .read_time = rs5c372_rtc_read_time, | |
167 | .set_time = rs5c372_rtc_set_time, | |
168 | }; | |
169 | ||
170 | static ssize_t rs5c372_sysfs_show_trim(struct device *dev, | |
171 | struct device_attribute *attr, char *buf) | |
172 | { | |
173 | int trim; | |
174 | ||
175 | if (rs5c372_get_trim(to_i2c_client(dev), NULL, &trim) == 0) | |
176 | return sprintf(buf, "0x%2x\n", trim); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); | |
181 | ||
182 | static ssize_t rs5c372_sysfs_show_osc(struct device *dev, | |
183 | struct device_attribute *attr, char *buf) | |
184 | { | |
185 | int osc; | |
186 | ||
187 | if (rs5c372_get_trim(to_i2c_client(dev), &osc, NULL) == 0) | |
188 | return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); | |
193 | ||
194 | static int rs5c372_attach(struct i2c_adapter *adapter) | |
195 | { | |
196 | dev_dbg(&adapter->dev, "%s\n", __FUNCTION__); | |
197 | return i2c_probe(adapter, &addr_data, rs5c372_probe); | |
198 | } | |
199 | ||
200 | static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind) | |
201 | { | |
202 | int err = 0; | |
203 | struct i2c_client *client; | |
204 | struct rtc_device *rtc; | |
205 | ||
206 | dev_dbg(&adapter->dev, "%s\n", __FUNCTION__); | |
207 | ||
208 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) { | |
209 | err = -ENODEV; | |
210 | goto exit; | |
211 | } | |
212 | ||
213 | if (!(client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL))) { | |
214 | err = -ENOMEM; | |
215 | goto exit; | |
216 | } | |
217 | ||
218 | /* I2C client */ | |
219 | client->addr = address; | |
220 | client->driver = &rs5c372_driver; | |
221 | client->adapter = adapter; | |
222 | ||
223 | strlcpy(client->name, rs5c372_driver.driver.name, I2C_NAME_SIZE); | |
224 | ||
225 | /* Inform the i2c layer */ | |
226 | if ((err = i2c_attach_client(client))) | |
227 | goto exit_kfree; | |
228 | ||
229 | dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n"); | |
230 | ||
231 | rtc = rtc_device_register(rs5c372_driver.driver.name, &client->dev, | |
232 | &rs5c372_rtc_ops, THIS_MODULE); | |
233 | ||
234 | if (IS_ERR(rtc)) { | |
235 | err = PTR_ERR(rtc); | |
236 | dev_err(&client->dev, | |
237 | "unable to register the class device\n"); | |
238 | goto exit_detach; | |
239 | } | |
240 | ||
241 | i2c_set_clientdata(client, rtc); | |
242 | ||
243 | device_create_file(&client->dev, &dev_attr_trim); | |
244 | device_create_file(&client->dev, &dev_attr_osc); | |
245 | ||
246 | return 0; | |
247 | ||
248 | exit_detach: | |
249 | i2c_detach_client(client); | |
250 | ||
251 | exit_kfree: | |
252 | kfree(client); | |
253 | ||
254 | exit: | |
255 | return err; | |
256 | } | |
257 | ||
258 | static int rs5c372_detach(struct i2c_client *client) | |
259 | { | |
260 | int err; | |
261 | struct rtc_device *rtc = i2c_get_clientdata(client); | |
262 | ||
263 | dev_dbg(&client->dev, "%s\n", __FUNCTION__); | |
264 | ||
265 | if (rtc) | |
266 | rtc_device_unregister(rtc); | |
267 | ||
268 | if ((err = i2c_detach_client(client))) | |
269 | return err; | |
270 | ||
271 | kfree(client); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static __init int rs5c372_init(void) | |
277 | { | |
278 | return i2c_add_driver(&rs5c372_driver); | |
279 | } | |
280 | ||
281 | static __exit void rs5c372_exit(void) | |
282 | { | |
283 | i2c_del_driver(&rs5c372_driver); | |
284 | } | |
285 | ||
286 | module_init(rs5c372_init); | |
287 | module_exit(rs5c372_exit); | |
288 | ||
289 | MODULE_AUTHOR( | |
290 | "Pavel Mironchik <pmironchik@optifacio.net>, " | |
291 | "Alessandro Zummo <a.zummo@towertech.it>"); | |
292 | MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); | |
293 | MODULE_LICENSE("GPL"); | |
294 | MODULE_VERSION(DRV_VERSION); |