diff options
-rw-r--r-- | drivers/rtc/Kconfig | 10 | ||||
-rw-r--r-- | drivers/rtc/Makefile | 1 | ||||
-rw-r--r-- | drivers/rtc/rtc-rs5c372.c | 294 |
3 files changed, 305 insertions, 0 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 0309fb368758..609f55593459 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig | |||
@@ -107,6 +107,16 @@ config RTC_DRV_PCF8563 | |||
107 | This driver can also be built as a module. If so, the module | 107 | This driver can also be built as a module. If so, the module |
108 | will be called rtc-pcf8563. | 108 | will be called rtc-pcf8563. |
109 | 109 | ||
110 | config RTC_DRV_RS5C372 | ||
111 | tristate "Ricoh RS5C372A/B" | ||
112 | depends on RTC_CLASS && I2C | ||
113 | help | ||
114 | If you say yes here you get support for the | ||
115 | Ricoh RS5C372A and RS5C372B RTC chips. | ||
116 | |||
117 | This driver can also be built as a module. If so, the module | ||
118 | will be called rtc-rs5c372. | ||
119 | |||
110 | config RTC_DRV_TEST | 120 | config RTC_DRV_TEST |
111 | tristate "Test driver/device" | 121 | tristate "Test driver/device" |
112 | depends on RTC_CLASS | 122 | depends on RTC_CLASS |
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index bdf7e491d5ac..d2b4b1735598 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile | |||
@@ -15,4 +15,5 @@ obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o | |||
15 | obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o | 15 | obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o |
16 | obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o | 16 | obj-$(CONFIG_RTC_DRV_DS1672) += rtc-ds1672.o |
17 | obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o | 17 | obj-$(CONFIG_RTC_DRV_PCF8563) += rtc-pcf8563.o |
18 | obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o | ||
18 | 19 | ||
diff --git a/drivers/rtc/rtc-rs5c372.c b/drivers/rtc/rtc-rs5c372.c new file mode 100644 index 000000000000..396c8681f66c --- /dev/null +++ b/drivers/rtc/rtc-rs5c372.c | |||
@@ -0,0 +1,294 @@ | |||
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); | ||