Commit | Line | Data |
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7520b94d AZ |
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 | ||
c6f24f99 | 16 | #define DRV_VERSION "0.3" |
7520b94d AZ |
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 | ||
c6f24f99 RV |
42 | struct rs5c372 { |
43 | u8 reg_addr; | |
44 | u8 regs[17]; | |
45 | struct i2c_msg msg[1]; | |
46 | struct i2c_client client; | |
47 | struct rtc_device *rtc; | |
48 | }; | |
49 | ||
7520b94d AZ |
50 | static struct i2c_driver rs5c372_driver = { |
51 | .driver = { | |
52 | .name = "rs5c372", | |
53 | }, | |
54 | .attach_adapter = &rs5c372_attach, | |
55 | .detach_client = &rs5c372_detach, | |
56 | }; | |
57 | ||
58 | static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) | |
59 | { | |
7520b94d | 60 | |
c6f24f99 RV |
61 | struct rs5c372 *rs5c372 = i2c_get_clientdata(client); |
62 | u8 *buf = &(rs5c372->regs[1]); | |
63 | ||
64 | /* this implements the 3rd reading method, according | |
65 | * to the datasheet. rs5c372 defaults to internal | |
66 | * address 0xF, so 0x0 is in regs[1] | |
7520b94d | 67 | */ |
7520b94d | 68 | |
c6f24f99 | 69 | if ((i2c_transfer(client->adapter, rs5c372->msg, 1)) != 1) { |
7520b94d AZ |
70 | dev_err(&client->dev, "%s: read error\n", __FUNCTION__); |
71 | return -EIO; | |
72 | } | |
73 | ||
74 | tm->tm_sec = BCD2BIN(buf[RS5C372_REG_SECS] & 0x7f); | |
75 | tm->tm_min = BCD2BIN(buf[RS5C372_REG_MINS] & 0x7f); | |
76 | tm->tm_hour = BCD2BIN(buf[RS5C372_REG_HOURS] & 0x3f); | |
77 | tm->tm_wday = BCD2BIN(buf[RS5C372_REG_WDAY] & 0x07); | |
78 | tm->tm_mday = BCD2BIN(buf[RS5C372_REG_DAY] & 0x3f); | |
79 | ||
80 | /* tm->tm_mon is zero-based */ | |
81 | tm->tm_mon = BCD2BIN(buf[RS5C372_REG_MONTH] & 0x1f) - 1; | |
82 | ||
83 | /* year is 1900 + tm->tm_year */ | |
84 | tm->tm_year = BCD2BIN(buf[RS5C372_REG_YEAR]) + 100; | |
85 | ||
86 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " | |
87 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
88 | __FUNCTION__, | |
89 | tm->tm_sec, tm->tm_min, tm->tm_hour, | |
90 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
91 | ||
92 | return 0; | |
93 | } | |
94 | ||
95 | static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
96 | { | |
97 | unsigned char buf[8] = { RS5C372_REG_BASE }; | |
98 | ||
99 | dev_dbg(&client->dev, | |
11966adc | 100 | "%s: secs=%d, mins=%d, hours=%d " |
7520b94d AZ |
101 | "mday=%d, mon=%d, year=%d, wday=%d\n", |
102 | __FUNCTION__, tm->tm_sec, tm->tm_min, tm->tm_hour, | |
103 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
104 | ||
105 | buf[1] = BIN2BCD(tm->tm_sec); | |
106 | buf[2] = BIN2BCD(tm->tm_min); | |
107 | buf[3] = BIN2BCD(tm->tm_hour); | |
108 | buf[4] = BIN2BCD(tm->tm_wday); | |
109 | buf[5] = BIN2BCD(tm->tm_mday); | |
110 | buf[6] = BIN2BCD(tm->tm_mon + 1); | |
111 | buf[7] = BIN2BCD(tm->tm_year - 100); | |
112 | ||
113 | if ((i2c_master_send(client, buf, 8)) != 8) { | |
114 | dev_err(&client->dev, "%s: write error\n", __FUNCTION__); | |
115 | return -EIO; | |
116 | } | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) | |
122 | { | |
c6f24f99 RV |
123 | struct rs5c372 *rs5c372 = i2c_get_clientdata(client); |
124 | u8 tmp = rs5c372->regs[RS5C372_REG_TRIM + 1]; | |
7520b94d | 125 | |
7520b94d | 126 | if (osc) |
c6f24f99 | 127 | *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; |
7520b94d | 128 | |
17ad78e5 | 129 | if (trim) { |
c6f24f99 | 130 | *trim = tmp & RS5C372_TRIM_MASK; |
17ad78e5 AB |
131 | dev_dbg(&client->dev, "%s: raw trim=%x\n", __FUNCTION__, *trim); |
132 | } | |
7520b94d AZ |
133 | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
138 | { | |
139 | return rs5c372_get_datetime(to_i2c_client(dev), tm); | |
140 | } | |
141 | ||
142 | static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
143 | { | |
144 | return rs5c372_set_datetime(to_i2c_client(dev), tm); | |
145 | } | |
146 | ||
147 | static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) | |
148 | { | |
149 | int err, osc, trim; | |
150 | ||
adfb4341 AZ |
151 | err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); |
152 | if (err == 0) { | |
7520b94d AZ |
153 | seq_printf(seq, "%d.%03d KHz\n", osc / 1000, osc % 1000); |
154 | seq_printf(seq, "trim\t: %d\n", trim); | |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
ff8371ac | 160 | static const struct rtc_class_ops rs5c372_rtc_ops = { |
7520b94d AZ |
161 | .proc = rs5c372_rtc_proc, |
162 | .read_time = rs5c372_rtc_read_time, | |
163 | .set_time = rs5c372_rtc_set_time, | |
164 | }; | |
165 | ||
166 | static ssize_t rs5c372_sysfs_show_trim(struct device *dev, | |
167 | struct device_attribute *attr, char *buf) | |
168 | { | |
82896072 | 169 | int err, trim; |
7520b94d | 170 | |
82896072 AZ |
171 | err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); |
172 | if (err) | |
173 | return err; | |
7520b94d | 174 | |
82896072 | 175 | return sprintf(buf, "0x%2x\n", trim); |
7520b94d AZ |
176 | } |
177 | static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); | |
178 | ||
179 | static ssize_t rs5c372_sysfs_show_osc(struct device *dev, | |
180 | struct device_attribute *attr, char *buf) | |
181 | { | |
82896072 | 182 | int err, osc; |
7520b94d | 183 | |
82896072 AZ |
184 | err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); |
185 | if (err) | |
186 | return err; | |
7520b94d | 187 | |
82896072 | 188 | return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); |
7520b94d AZ |
189 | } |
190 | static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); | |
191 | ||
192 | static int rs5c372_attach(struct i2c_adapter *adapter) | |
193 | { | |
7520b94d AZ |
194 | return i2c_probe(adapter, &addr_data, rs5c372_probe); |
195 | } | |
196 | ||
197 | static int rs5c372_probe(struct i2c_adapter *adapter, int address, int kind) | |
198 | { | |
199 | int err = 0; | |
200 | struct i2c_client *client; | |
c6f24f99 | 201 | struct rs5c372 *rs5c372; |
7520b94d | 202 | |
a14e1893 | 203 | dev_dbg(adapter->class_dev.dev, "%s\n", __FUNCTION__); |
7520b94d AZ |
204 | |
205 | if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) { | |
206 | err = -ENODEV; | |
207 | goto exit; | |
208 | } | |
209 | ||
c6f24f99 | 210 | if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) { |
7520b94d AZ |
211 | err = -ENOMEM; |
212 | goto exit; | |
213 | } | |
c6f24f99 | 214 | client = &rs5c372->client; |
7520b94d AZ |
215 | |
216 | /* I2C client */ | |
217 | client->addr = address; | |
218 | client->driver = &rs5c372_driver; | |
219 | client->adapter = adapter; | |
220 | ||
221 | strlcpy(client->name, rs5c372_driver.driver.name, I2C_NAME_SIZE); | |
222 | ||
c6f24f99 RV |
223 | i2c_set_clientdata(client, rs5c372); |
224 | ||
225 | rs5c372->msg[0].addr = address; | |
226 | rs5c372->msg[0].flags = I2C_M_RD; | |
227 | rs5c372->msg[0].len = sizeof(rs5c372->regs); | |
228 | rs5c372->msg[0].buf = rs5c372->regs; | |
229 | ||
7520b94d AZ |
230 | /* Inform the i2c layer */ |
231 | if ((err = i2c_attach_client(client))) | |
232 | goto exit_kfree; | |
233 | ||
234 | dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n"); | |
235 | ||
c6f24f99 RV |
236 | rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name, |
237 | &client->dev, &rs5c372_rtc_ops, THIS_MODULE); | |
7520b94d | 238 | |
c6f24f99 RV |
239 | if (IS_ERR(rs5c372->rtc)) { |
240 | err = PTR_ERR(rs5c372->rtc); | |
7520b94d AZ |
241 | goto exit_detach; |
242 | } | |
243 | ||
91046a8a | 244 | err = device_create_file(&client->dev, &dev_attr_trim); |
c6f24f99 RV |
245 | if (err) |
246 | goto exit_devreg; | |
91046a8a | 247 | err = device_create_file(&client->dev, &dev_attr_osc); |
c6f24f99 RV |
248 | if (err) |
249 | goto exit_trim; | |
7520b94d AZ |
250 | |
251 | return 0; | |
252 | ||
91046a8a JG |
253 | exit_trim: |
254 | device_remove_file(&client->dev, &dev_attr_trim); | |
255 | ||
256 | exit_devreg: | |
c6f24f99 | 257 | rtc_device_unregister(rs5c372->rtc); |
91046a8a | 258 | |
7520b94d AZ |
259 | exit_detach: |
260 | i2c_detach_client(client); | |
261 | ||
262 | exit_kfree: | |
c6f24f99 | 263 | kfree(rs5c372); |
7520b94d AZ |
264 | |
265 | exit: | |
266 | return err; | |
267 | } | |
268 | ||
269 | static int rs5c372_detach(struct i2c_client *client) | |
270 | { | |
271 | int err; | |
c6f24f99 | 272 | struct rs5c372 *rs5c372 = i2c_get_clientdata(client); |
7520b94d | 273 | |
c6f24f99 RV |
274 | if (rs5c372->rtc) |
275 | rtc_device_unregister(rs5c372->rtc); | |
7520b94d AZ |
276 | |
277 | if ((err = i2c_detach_client(client))) | |
278 | return err; | |
279 | ||
c6f24f99 | 280 | kfree(rs5c372); |
7520b94d AZ |
281 | return 0; |
282 | } | |
283 | ||
284 | static __init int rs5c372_init(void) | |
285 | { | |
286 | return i2c_add_driver(&rs5c372_driver); | |
287 | } | |
288 | ||
289 | static __exit void rs5c372_exit(void) | |
290 | { | |
291 | i2c_del_driver(&rs5c372_driver); | |
292 | } | |
293 | ||
294 | module_init(rs5c372_init); | |
295 | module_exit(rs5c372_exit); | |
296 | ||
297 | MODULE_AUTHOR( | |
298 | "Pavel Mironchik <pmironchik@optifacio.net>, " | |
299 | "Alessandro Zummo <a.zummo@towertech.it>"); | |
300 | MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); | |
301 | MODULE_LICENSE("GPL"); | |
302 | MODULE_VERSION(DRV_VERSION); |