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caaff562 AN |
1 | /* |
2 | * I2C client/driver for the ST M41T80 family of i2c rtc chips. | |
3 | * | |
4 | * Author: Alexander Bigga <ab@mycable.de> | |
5 | * | |
6 | * Based on m41t00.c by Mark A. Greer <mgreer@mvista.com> | |
7 | * | |
8 | * 2006 (c) mycable GmbH | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | */ | |
15 | ||
35aa64f3 MR |
16 | #include <linux/bcd.h> |
17 | #include <linux/i2c.h> | |
caaff562 | 18 | #include <linux/init.h> |
9fb1f68d | 19 | #include <linux/kernel.h> |
35aa64f3 MR |
20 | #include <linux/module.h> |
21 | #include <linux/rtc.h> | |
caaff562 | 22 | #include <linux/slab.h> |
41012735 | 23 | #include <linux/smp_lock.h> |
caaff562 | 24 | #include <linux/string.h> |
617780d2 | 25 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
617780d2 AN |
26 | #include <linux/fs.h> |
27 | #include <linux/ioctl.h> | |
35aa64f3 MR |
28 | #include <linux/miscdevice.h> |
29 | #include <linux/reboot.h> | |
30 | #include <linux/watchdog.h> | |
617780d2 | 31 | #endif |
caaff562 AN |
32 | |
33 | #define M41T80_REG_SSEC 0 | |
34 | #define M41T80_REG_SEC 1 | |
35 | #define M41T80_REG_MIN 2 | |
36 | #define M41T80_REG_HOUR 3 | |
37 | #define M41T80_REG_WDAY 4 | |
38 | #define M41T80_REG_DAY 5 | |
39 | #define M41T80_REG_MON 6 | |
40 | #define M41T80_REG_YEAR 7 | |
41 | #define M41T80_REG_ALARM_MON 0xa | |
42 | #define M41T80_REG_ALARM_DAY 0xb | |
43 | #define M41T80_REG_ALARM_HOUR 0xc | |
44 | #define M41T80_REG_ALARM_MIN 0xd | |
45 | #define M41T80_REG_ALARM_SEC 0xe | |
46 | #define M41T80_REG_FLAGS 0xf | |
47 | #define M41T80_REG_SQW 0x13 | |
48 | ||
49 | #define M41T80_DATETIME_REG_SIZE (M41T80_REG_YEAR + 1) | |
50 | #define M41T80_ALARM_REG_SIZE \ | |
51 | (M41T80_REG_ALARM_SEC + 1 - M41T80_REG_ALARM_MON) | |
52 | ||
53 | #define M41T80_SEC_ST (1 << 7) /* ST: Stop Bit */ | |
54 | #define M41T80_ALMON_AFE (1 << 7) /* AFE: AF Enable Bit */ | |
55 | #define M41T80_ALMON_SQWE (1 << 6) /* SQWE: SQW Enable Bit */ | |
56 | #define M41T80_ALHOUR_HT (1 << 6) /* HT: Halt Update Bit */ | |
57 | #define M41T80_FLAGS_AF (1 << 6) /* AF: Alarm Flag Bit */ | |
58 | #define M41T80_FLAGS_BATT_LOW (1 << 4) /* BL: Battery Low Bit */ | |
d3a126fc SF |
59 | #define M41T80_WATCHDOG_RB2 (1 << 7) /* RB: Watchdog resolution */ |
60 | #define M41T80_WATCHDOG_RB1 (1 << 1) /* RB: Watchdog resolution */ | |
61 | #define M41T80_WATCHDOG_RB0 (1 << 0) /* RB: Watchdog resolution */ | |
caaff562 | 62 | |
d3a126fc SF |
63 | #define M41T80_FEATURE_HT (1 << 0) /* Halt feature */ |
64 | #define M41T80_FEATURE_BL (1 << 1) /* Battery low indicator */ | |
65 | #define M41T80_FEATURE_SQ (1 << 2) /* Squarewave feature */ | |
66 | #define M41T80_FEATURE_WD (1 << 3) /* Extra watchdog resolution */ | |
caaff562 AN |
67 | |
68 | #define DRV_VERSION "0.05" | |
69 | ||
3760f736 | 70 | static const struct i2c_device_id m41t80_id[] = { |
d3a126fc SF |
71 | { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD }, |
72 | { "m41t80", M41T80_FEATURE_SQ }, | |
73 | { "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ}, | |
74 | { "m41t81s", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
75 | { "m41t82", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
76 | { "m41t83", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
77 | { "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
78 | { "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
79 | { "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
3760f736 | 80 | { } |
caaff562 | 81 | }; |
3760f736 | 82 | MODULE_DEVICE_TABLE(i2c, m41t80_id); |
caaff562 AN |
83 | |
84 | struct m41t80_data { | |
3760f736 | 85 | u8 features; |
caaff562 AN |
86 | struct rtc_device *rtc; |
87 | }; | |
88 | ||
89 | static int m41t80_get_datetime(struct i2c_client *client, | |
90 | struct rtc_time *tm) | |
91 | { | |
92 | u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; | |
93 | struct i2c_msg msgs[] = { | |
94 | { | |
95 | .addr = client->addr, | |
96 | .flags = 0, | |
97 | .len = 1, | |
98 | .buf = dt_addr, | |
99 | }, | |
100 | { | |
101 | .addr = client->addr, | |
102 | .flags = I2C_M_RD, | |
103 | .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, | |
104 | .buf = buf + M41T80_REG_SEC, | |
105 | }, | |
106 | }; | |
107 | ||
108 | if (i2c_transfer(client->adapter, msgs, 2) < 0) { | |
109 | dev_err(&client->dev, "read error\n"); | |
110 | return -EIO; | |
111 | } | |
112 | ||
fe20ba70 AB |
113 | tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f); |
114 | tm->tm_min = bcd2bin(buf[M41T80_REG_MIN] & 0x7f); | |
115 | tm->tm_hour = bcd2bin(buf[M41T80_REG_HOUR] & 0x3f); | |
116 | tm->tm_mday = bcd2bin(buf[M41T80_REG_DAY] & 0x3f); | |
caaff562 | 117 | tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; |
fe20ba70 | 118 | tm->tm_mon = bcd2bin(buf[M41T80_REG_MON] & 0x1f) - 1; |
caaff562 AN |
119 | |
120 | /* assume 20YY not 19YY, and ignore the Century Bit */ | |
fe20ba70 | 121 | tm->tm_year = bcd2bin(buf[M41T80_REG_YEAR]) + 100; |
caaff562 AN |
122 | return 0; |
123 | } | |
124 | ||
125 | /* Sets the given date and time to the real time clock. */ | |
126 | static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
127 | { | |
128 | u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; | |
129 | u8 *buf = &wbuf[1]; | |
130 | u8 dt_addr[1] = { M41T80_REG_SEC }; | |
131 | struct i2c_msg msgs_in[] = { | |
132 | { | |
133 | .addr = client->addr, | |
134 | .flags = 0, | |
135 | .len = 1, | |
136 | .buf = dt_addr, | |
137 | }, | |
138 | { | |
139 | .addr = client->addr, | |
140 | .flags = I2C_M_RD, | |
141 | .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, | |
142 | .buf = buf + M41T80_REG_SEC, | |
143 | }, | |
144 | }; | |
145 | struct i2c_msg msgs[] = { | |
146 | { | |
147 | .addr = client->addr, | |
148 | .flags = 0, | |
149 | .len = 1 + M41T80_DATETIME_REG_SIZE, | |
150 | .buf = wbuf, | |
151 | }, | |
152 | }; | |
153 | ||
154 | /* Read current reg values into buf[1..7] */ | |
155 | if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { | |
156 | dev_err(&client->dev, "read error\n"); | |
157 | return -EIO; | |
158 | } | |
159 | ||
160 | wbuf[0] = 0; /* offset into rtc's regs */ | |
161 | /* Merge time-data and register flags into buf[0..7] */ | |
162 | buf[M41T80_REG_SSEC] = 0; | |
163 | buf[M41T80_REG_SEC] = | |
fe20ba70 | 164 | bin2bcd(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); |
caaff562 | 165 | buf[M41T80_REG_MIN] = |
fe20ba70 | 166 | bin2bcd(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); |
caaff562 | 167 | buf[M41T80_REG_HOUR] = |
fe20ba70 | 168 | bin2bcd(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ; |
caaff562 AN |
169 | buf[M41T80_REG_WDAY] = |
170 | (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); | |
171 | buf[M41T80_REG_DAY] = | |
fe20ba70 | 172 | bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); |
caaff562 | 173 | buf[M41T80_REG_MON] = |
fe20ba70 | 174 | bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); |
caaff562 | 175 | /* assume 20YY not 19YY */ |
fe20ba70 | 176 | buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100); |
caaff562 AN |
177 | |
178 | if (i2c_transfer(client->adapter, msgs, 1) != 1) { | |
179 | dev_err(&client->dev, "write error\n"); | |
180 | return -EIO; | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
185 | #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) | |
186 | static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) | |
187 | { | |
188 | struct i2c_client *client = to_i2c_client(dev); | |
189 | struct m41t80_data *clientdata = i2c_get_clientdata(client); | |
190 | u8 reg; | |
191 | ||
3760f736 | 192 | if (clientdata->features & M41T80_FEATURE_BL) { |
caaff562 AN |
193 | reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); |
194 | seq_printf(seq, "battery\t\t: %s\n", | |
195 | (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); | |
196 | } | |
197 | return 0; | |
198 | } | |
199 | #else | |
200 | #define m41t80_rtc_proc NULL | |
201 | #endif | |
202 | ||
203 | static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
204 | { | |
205 | return m41t80_get_datetime(to_i2c_client(dev), tm); | |
206 | } | |
207 | ||
208 | static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
209 | { | |
210 | return m41t80_set_datetime(to_i2c_client(dev), tm); | |
211 | } | |
212 | ||
213 | #if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) | |
214 | static int | |
215 | m41t80_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
216 | { | |
217 | struct i2c_client *client = to_i2c_client(dev); | |
218 | int rc; | |
219 | ||
220 | switch (cmd) { | |
221 | case RTC_AIE_OFF: | |
222 | case RTC_AIE_ON: | |
223 | break; | |
224 | default: | |
225 | return -ENOIOCTLCMD; | |
226 | } | |
227 | ||
228 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); | |
229 | if (rc < 0) | |
230 | goto err; | |
231 | switch (cmd) { | |
232 | case RTC_AIE_OFF: | |
233 | rc &= ~M41T80_ALMON_AFE; | |
234 | break; | |
235 | case RTC_AIE_ON: | |
236 | rc |= M41T80_ALMON_AFE; | |
237 | break; | |
238 | } | |
239 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) | |
240 | goto err; | |
241 | return 0; | |
242 | err: | |
243 | return -EIO; | |
244 | } | |
245 | #else | |
246 | #define m41t80_rtc_ioctl NULL | |
247 | #endif | |
248 | ||
249 | static int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
250 | { | |
251 | struct i2c_client *client = to_i2c_client(dev); | |
252 | u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; | |
253 | u8 *buf = &wbuf[1]; | |
254 | u8 *reg = buf - M41T80_REG_ALARM_MON; | |
255 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; | |
256 | struct i2c_msg msgs_in[] = { | |
257 | { | |
258 | .addr = client->addr, | |
259 | .flags = 0, | |
260 | .len = 1, | |
261 | .buf = dt_addr, | |
262 | }, | |
263 | { | |
264 | .addr = client->addr, | |
265 | .flags = I2C_M_RD, | |
266 | .len = M41T80_ALARM_REG_SIZE, | |
267 | .buf = buf, | |
268 | }, | |
269 | }; | |
270 | struct i2c_msg msgs[] = { | |
271 | { | |
272 | .addr = client->addr, | |
273 | .flags = 0, | |
274 | .len = 1 + M41T80_ALARM_REG_SIZE, | |
275 | .buf = wbuf, | |
276 | }, | |
277 | }; | |
278 | ||
279 | if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { | |
280 | dev_err(&client->dev, "read error\n"); | |
281 | return -EIO; | |
282 | } | |
283 | reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); | |
284 | reg[M41T80_REG_ALARM_DAY] = 0; | |
285 | reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); | |
286 | reg[M41T80_REG_ALARM_MIN] = 0; | |
287 | reg[M41T80_REG_ALARM_SEC] = 0; | |
288 | ||
289 | wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ | |
290 | reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? | |
fe20ba70 | 291 | bin2bcd(t->time.tm_sec) : 0x80; |
caaff562 | 292 | reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? |
fe20ba70 | 293 | bin2bcd(t->time.tm_min) : 0x80; |
caaff562 | 294 | reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? |
fe20ba70 | 295 | bin2bcd(t->time.tm_hour) : 0x80; |
caaff562 | 296 | reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? |
fe20ba70 | 297 | bin2bcd(t->time.tm_mday) : 0x80; |
caaff562 | 298 | if (t->time.tm_mon >= 0) |
fe20ba70 | 299 | reg[M41T80_REG_ALARM_MON] |= bin2bcd(t->time.tm_mon + 1); |
caaff562 AN |
300 | else |
301 | reg[M41T80_REG_ALARM_DAY] |= 0x40; | |
302 | ||
303 | if (i2c_transfer(client->adapter, msgs, 1) != 1) { | |
304 | dev_err(&client->dev, "write error\n"); | |
305 | return -EIO; | |
306 | } | |
307 | ||
308 | if (t->enabled) { | |
309 | reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; | |
310 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
311 | reg[M41T80_REG_ALARM_MON]) < 0) { | |
312 | dev_err(&client->dev, "write error\n"); | |
313 | return -EIO; | |
314 | } | |
315 | } | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
320 | { | |
321 | struct i2c_client *client = to_i2c_client(dev); | |
322 | u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ | |
323 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; | |
324 | u8 *reg = buf - M41T80_REG_ALARM_MON; | |
325 | struct i2c_msg msgs[] = { | |
326 | { | |
327 | .addr = client->addr, | |
328 | .flags = 0, | |
329 | .len = 1, | |
330 | .buf = dt_addr, | |
331 | }, | |
332 | { | |
333 | .addr = client->addr, | |
334 | .flags = I2C_M_RD, | |
335 | .len = M41T80_ALARM_REG_SIZE + 1, | |
336 | .buf = buf, | |
337 | }, | |
338 | }; | |
339 | ||
340 | if (i2c_transfer(client->adapter, msgs, 2) < 0) { | |
341 | dev_err(&client->dev, "read error\n"); | |
342 | return -EIO; | |
343 | } | |
344 | t->time.tm_sec = -1; | |
345 | t->time.tm_min = -1; | |
346 | t->time.tm_hour = -1; | |
347 | t->time.tm_mday = -1; | |
348 | t->time.tm_mon = -1; | |
349 | if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) | |
fe20ba70 | 350 | t->time.tm_sec = bcd2bin(reg[M41T80_REG_ALARM_SEC] & 0x7f); |
caaff562 | 351 | if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) |
fe20ba70 | 352 | t->time.tm_min = bcd2bin(reg[M41T80_REG_ALARM_MIN] & 0x7f); |
caaff562 | 353 | if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) |
fe20ba70 | 354 | t->time.tm_hour = bcd2bin(reg[M41T80_REG_ALARM_HOUR] & 0x3f); |
caaff562 | 355 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) |
fe20ba70 | 356 | t->time.tm_mday = bcd2bin(reg[M41T80_REG_ALARM_DAY] & 0x3f); |
caaff562 | 357 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) |
fe20ba70 | 358 | t->time.tm_mon = bcd2bin(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; |
caaff562 AN |
359 | t->time.tm_year = -1; |
360 | t->time.tm_wday = -1; | |
361 | t->time.tm_yday = -1; | |
362 | t->time.tm_isdst = -1; | |
363 | t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); | |
364 | t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static struct rtc_class_ops m41t80_rtc_ops = { | |
369 | .read_time = m41t80_rtc_read_time, | |
370 | .set_time = m41t80_rtc_set_time, | |
371 | .read_alarm = m41t80_rtc_read_alarm, | |
372 | .set_alarm = m41t80_rtc_set_alarm, | |
373 | .proc = m41t80_rtc_proc, | |
374 | .ioctl = m41t80_rtc_ioctl, | |
375 | }; | |
376 | ||
377 | #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) | |
378 | static ssize_t m41t80_sysfs_show_flags(struct device *dev, | |
379 | struct device_attribute *attr, char *buf) | |
380 | { | |
381 | struct i2c_client *client = to_i2c_client(dev); | |
382 | int val; | |
383 | ||
384 | val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); | |
385 | if (val < 0) | |
386 | return -EIO; | |
387 | return sprintf(buf, "%#x\n", val); | |
388 | } | |
389 | static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); | |
390 | ||
391 | static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, | |
392 | struct device_attribute *attr, char *buf) | |
393 | { | |
394 | struct i2c_client *client = to_i2c_client(dev); | |
d3a126fc | 395 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
caaff562 AN |
396 | int val; |
397 | ||
d3a126fc SF |
398 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
399 | return -EINVAL; | |
400 | ||
caaff562 AN |
401 | val = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); |
402 | if (val < 0) | |
403 | return -EIO; | |
404 | val = (val >> 4) & 0xf; | |
405 | switch (val) { | |
406 | case 0: | |
407 | break; | |
408 | case 1: | |
409 | val = 32768; | |
410 | break; | |
411 | default: | |
412 | val = 32768 >> val; | |
413 | } | |
414 | return sprintf(buf, "%d\n", val); | |
415 | } | |
416 | static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, | |
417 | struct device_attribute *attr, | |
418 | const char *buf, size_t count) | |
419 | { | |
420 | struct i2c_client *client = to_i2c_client(dev); | |
d3a126fc | 421 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
caaff562 AN |
422 | int almon, sqw; |
423 | int val = simple_strtoul(buf, NULL, 0); | |
424 | ||
d3a126fc SF |
425 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
426 | return -EINVAL; | |
427 | ||
caaff562 AN |
428 | if (val) { |
429 | if (!is_power_of_2(val)) | |
430 | return -EINVAL; | |
431 | val = ilog2(val); | |
432 | if (val == 15) | |
433 | val = 1; | |
434 | else if (val < 14) | |
435 | val = 15 - val; | |
436 | else | |
437 | return -EINVAL; | |
438 | } | |
439 | /* disable SQW, set SQW frequency & re-enable */ | |
440 | almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); | |
441 | if (almon < 0) | |
442 | return -EIO; | |
443 | sqw = i2c_smbus_read_byte_data(client, M41T80_REG_SQW); | |
444 | if (sqw < 0) | |
445 | return -EIO; | |
446 | sqw = (sqw & 0x0f) | (val << 4); | |
447 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
448 | almon & ~M41T80_ALMON_SQWE) < 0 || | |
449 | i2c_smbus_write_byte_data(client, M41T80_REG_SQW, sqw) < 0) | |
450 | return -EIO; | |
451 | if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
452 | almon | M41T80_ALMON_SQWE) < 0) | |
453 | return -EIO; | |
454 | return count; | |
455 | } | |
456 | static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, | |
457 | m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); | |
458 | ||
459 | static struct attribute *attrs[] = { | |
460 | &dev_attr_flags.attr, | |
461 | &dev_attr_sqwfreq.attr, | |
462 | NULL, | |
463 | }; | |
464 | static struct attribute_group attr_group = { | |
465 | .attrs = attrs, | |
466 | }; | |
467 | ||
468 | static int m41t80_sysfs_register(struct device *dev) | |
469 | { | |
470 | return sysfs_create_group(&dev->kobj, &attr_group); | |
471 | } | |
472 | #else | |
473 | static int m41t80_sysfs_register(struct device *dev) | |
474 | { | |
475 | return 0; | |
476 | } | |
477 | #endif | |
478 | ||
617780d2 AN |
479 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
480 | /* | |
481 | ***************************************************************************** | |
482 | * | |
483 | * Watchdog Driver | |
484 | * | |
485 | ***************************************************************************** | |
486 | */ | |
487 | static struct i2c_client *save_client; | |
488 | ||
489 | /* Default margin */ | |
490 | #define WD_TIMO 60 /* 1..31 seconds */ | |
491 | ||
492 | static int wdt_margin = WD_TIMO; | |
493 | module_param(wdt_margin, int, 0); | |
494 | MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); | |
495 | ||
496 | static unsigned long wdt_is_open; | |
497 | static int boot_flag; | |
498 | ||
499 | /** | |
500 | * wdt_ping: | |
501 | * | |
502 | * Reload counter one with the watchdog timeout. We don't bother reloading | |
503 | * the cascade counter. | |
504 | */ | |
505 | static void wdt_ping(void) | |
506 | { | |
507 | unsigned char i2c_data[2]; | |
508 | struct i2c_msg msgs1[1] = { | |
509 | { | |
510 | .addr = save_client->addr, | |
511 | .flags = 0, | |
512 | .len = 2, | |
513 | .buf = i2c_data, | |
514 | }, | |
515 | }; | |
d3a126fc SF |
516 | struct m41t80_data *clientdata = i2c_get_clientdata(save_client); |
517 | ||
617780d2 AN |
518 | i2c_data[0] = 0x09; /* watchdog register */ |
519 | ||
520 | if (wdt_margin > 31) | |
521 | i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ | |
522 | else | |
523 | /* | |
524 | * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) | |
525 | */ | |
526 | i2c_data[1] = wdt_margin<<2 | 0x82; | |
527 | ||
d3a126fc SF |
528 | /* |
529 | * M41T65 has three bits for watchdog resolution. Don't set bit 7, as | |
530 | * that would be an invalid resolution. | |
531 | */ | |
532 | if (clientdata->features & M41T80_FEATURE_WD) | |
533 | i2c_data[1] &= ~M41T80_WATCHDOG_RB2; | |
534 | ||
617780d2 AN |
535 | i2c_transfer(save_client->adapter, msgs1, 1); |
536 | } | |
537 | ||
538 | /** | |
539 | * wdt_disable: | |
540 | * | |
541 | * disables watchdog. | |
542 | */ | |
543 | static void wdt_disable(void) | |
544 | { | |
545 | unsigned char i2c_data[2], i2c_buf[0x10]; | |
546 | struct i2c_msg msgs0[2] = { | |
547 | { | |
548 | .addr = save_client->addr, | |
549 | .flags = 0, | |
550 | .len = 1, | |
551 | .buf = i2c_data, | |
552 | }, | |
553 | { | |
554 | .addr = save_client->addr, | |
555 | .flags = I2C_M_RD, | |
556 | .len = 1, | |
557 | .buf = i2c_buf, | |
558 | }, | |
559 | }; | |
560 | struct i2c_msg msgs1[1] = { | |
561 | { | |
562 | .addr = save_client->addr, | |
563 | .flags = 0, | |
564 | .len = 2, | |
565 | .buf = i2c_data, | |
566 | }, | |
567 | }; | |
568 | ||
569 | i2c_data[0] = 0x09; | |
570 | i2c_transfer(save_client->adapter, msgs0, 2); | |
571 | ||
572 | i2c_data[0] = 0x09; | |
573 | i2c_data[1] = 0x00; | |
574 | i2c_transfer(save_client->adapter, msgs1, 1); | |
575 | } | |
576 | ||
577 | /** | |
578 | * wdt_write: | |
579 | * @file: file handle to the watchdog | |
580 | * @buf: buffer to write (unused as data does not matter here | |
581 | * @count: count of bytes | |
582 | * @ppos: pointer to the position to write. No seeks allowed | |
583 | * | |
584 | * A write to a watchdog device is defined as a keepalive signal. Any | |
585 | * write of data will do, as we we don't define content meaning. | |
586 | */ | |
587 | static ssize_t wdt_write(struct file *file, const char __user *buf, | |
588 | size_t count, loff_t *ppos) | |
589 | { | |
590 | /* Can't seek (pwrite) on this device | |
591 | if (ppos != &file->f_pos) | |
592 | return -ESPIPE; | |
593 | */ | |
594 | if (count) { | |
595 | wdt_ping(); | |
596 | return 1; | |
597 | } | |
598 | return 0; | |
599 | } | |
600 | ||
601 | static ssize_t wdt_read(struct file *file, char __user *buf, | |
602 | size_t count, loff_t *ppos) | |
603 | { | |
604 | return 0; | |
605 | } | |
606 | ||
607 | /** | |
608 | * wdt_ioctl: | |
609 | * @inode: inode of the device | |
610 | * @file: file handle to the device | |
611 | * @cmd: watchdog command | |
612 | * @arg: argument pointer | |
613 | * | |
614 | * The watchdog API defines a common set of functions for all watchdogs | |
615 | * according to their available features. We only actually usefully support | |
616 | * querying capabilities and current status. | |
617 | */ | |
618 | static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
619 | unsigned long arg) | |
620 | { | |
621 | int new_margin, rv; | |
622 | static struct watchdog_info ident = { | |
623 | .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | | |
624 | WDIOF_SETTIMEOUT, | |
625 | .firmware_version = 1, | |
626 | .identity = "M41T80 WTD" | |
627 | }; | |
628 | ||
629 | switch (cmd) { | |
630 | case WDIOC_GETSUPPORT: | |
631 | return copy_to_user((struct watchdog_info __user *)arg, &ident, | |
632 | sizeof(ident)) ? -EFAULT : 0; | |
633 | ||
634 | case WDIOC_GETSTATUS: | |
635 | case WDIOC_GETBOOTSTATUS: | |
636 | return put_user(boot_flag, (int __user *)arg); | |
637 | case WDIOC_KEEPALIVE: | |
638 | wdt_ping(); | |
639 | return 0; | |
640 | case WDIOC_SETTIMEOUT: | |
641 | if (get_user(new_margin, (int __user *)arg)) | |
642 | return -EFAULT; | |
643 | /* Arbitrary, can't find the card's limits */ | |
644 | if (new_margin < 1 || new_margin > 124) | |
645 | return -EINVAL; | |
646 | wdt_margin = new_margin; | |
647 | wdt_ping(); | |
648 | /* Fall */ | |
649 | case WDIOC_GETTIMEOUT: | |
650 | return put_user(wdt_margin, (int __user *)arg); | |
651 | ||
652 | case WDIOC_SETOPTIONS: | |
653 | if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) | |
654 | return -EFAULT; | |
655 | ||
656 | if (rv & WDIOS_DISABLECARD) { | |
4c228db0 | 657 | pr_info("rtc-m41t80: disable watchdog\n"); |
617780d2 AN |
658 | wdt_disable(); |
659 | } | |
660 | ||
661 | if (rv & WDIOS_ENABLECARD) { | |
4c228db0 | 662 | pr_info("rtc-m41t80: enable watchdog\n"); |
617780d2 AN |
663 | wdt_ping(); |
664 | } | |
665 | ||
666 | return -EINVAL; | |
667 | } | |
668 | return -ENOTTY; | |
669 | } | |
670 | ||
671 | /** | |
672 | * wdt_open: | |
673 | * @inode: inode of device | |
674 | * @file: file handle to device | |
675 | * | |
676 | */ | |
677 | static int wdt_open(struct inode *inode, struct file *file) | |
678 | { | |
679 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { | |
41012735 AB |
680 | lock_kernel(); |
681 | if (test_and_set_bit(0, &wdt_is_open)) { | |
682 | unlock_kernel(); | |
617780d2 | 683 | return -EBUSY; |
41012735 | 684 | } |
617780d2 AN |
685 | /* |
686 | * Activate | |
687 | */ | |
688 | wdt_is_open = 1; | |
41012735 | 689 | unlock_kernel(); |
617780d2 AN |
690 | return 0; |
691 | } | |
692 | return -ENODEV; | |
693 | } | |
694 | ||
695 | /** | |
696 | * wdt_close: | |
697 | * @inode: inode to board | |
698 | * @file: file handle to board | |
699 | * | |
700 | */ | |
701 | static int wdt_release(struct inode *inode, struct file *file) | |
702 | { | |
703 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) | |
704 | clear_bit(0, &wdt_is_open); | |
705 | return 0; | |
706 | } | |
707 | ||
708 | /** | |
709 | * notify_sys: | |
710 | * @this: our notifier block | |
711 | * @code: the event being reported | |
712 | * @unused: unused | |
713 | * | |
714 | * Our notifier is called on system shutdowns. We want to turn the card | |
715 | * off at reboot otherwise the machine will reboot again during memory | |
716 | * test or worse yet during the following fsck. This would suck, in fact | |
717 | * trust me - if it happens it does suck. | |
718 | */ | |
719 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
720 | void *unused) | |
721 | { | |
722 | if (code == SYS_DOWN || code == SYS_HALT) | |
723 | /* Disable Watchdog */ | |
724 | wdt_disable(); | |
725 | return NOTIFY_DONE; | |
726 | } | |
727 | ||
728 | static const struct file_operations wdt_fops = { | |
729 | .owner = THIS_MODULE, | |
730 | .read = wdt_read, | |
731 | .ioctl = wdt_ioctl, | |
732 | .write = wdt_write, | |
733 | .open = wdt_open, | |
734 | .release = wdt_release, | |
735 | }; | |
736 | ||
737 | static struct miscdevice wdt_dev = { | |
738 | .minor = WATCHDOG_MINOR, | |
739 | .name = "watchdog", | |
740 | .fops = &wdt_fops, | |
741 | }; | |
742 | ||
743 | /* | |
744 | * The WDT card needs to learn about soft shutdowns in order to | |
745 | * turn the timebomb registers off. | |
746 | */ | |
747 | static struct notifier_block wdt_notifier = { | |
748 | .notifier_call = wdt_notify_sys, | |
749 | }; | |
750 | #endif /* CONFIG_RTC_DRV_M41T80_WDT */ | |
751 | ||
caaff562 AN |
752 | /* |
753 | ***************************************************************************** | |
754 | * | |
755 | * Driver Interface | |
756 | * | |
757 | ***************************************************************************** | |
758 | */ | |
d2653e92 JD |
759 | static int m41t80_probe(struct i2c_client *client, |
760 | const struct i2c_device_id *id) | |
caaff562 | 761 | { |
3760f736 | 762 | int rc = 0; |
caaff562 AN |
763 | struct rtc_device *rtc = NULL; |
764 | struct rtc_time tm; | |
caaff562 AN |
765 | struct m41t80_data *clientdata = NULL; |
766 | ||
767 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | |
768 | | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
769 | rc = -ENODEV; | |
770 | goto exit; | |
771 | } | |
772 | ||
773 | dev_info(&client->dev, | |
774 | "chip found, driver version " DRV_VERSION "\n"); | |
775 | ||
caaff562 AN |
776 | clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); |
777 | if (!clientdata) { | |
778 | rc = -ENOMEM; | |
779 | goto exit; | |
780 | } | |
781 | ||
782 | rtc = rtc_device_register(client->name, &client->dev, | |
783 | &m41t80_rtc_ops, THIS_MODULE); | |
784 | if (IS_ERR(rtc)) { | |
785 | rc = PTR_ERR(rtc); | |
786 | rtc = NULL; | |
787 | goto exit; | |
788 | } | |
789 | ||
790 | clientdata->rtc = rtc; | |
3760f736 | 791 | clientdata->features = id->driver_data; |
caaff562 AN |
792 | i2c_set_clientdata(client, clientdata); |
793 | ||
794 | /* Make sure HT (Halt Update) bit is cleared */ | |
795 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); | |
796 | if (rc < 0) | |
797 | goto ht_err; | |
798 | ||
799 | if (rc & M41T80_ALHOUR_HT) { | |
3760f736 | 800 | if (clientdata->features & M41T80_FEATURE_HT) { |
caaff562 AN |
801 | m41t80_get_datetime(client, &tm); |
802 | dev_info(&client->dev, "HT bit was set!\n"); | |
803 | dev_info(&client->dev, | |
804 | "Power Down at " | |
805 | "%04i-%02i-%02i %02i:%02i:%02i\n", | |
806 | tm.tm_year + 1900, | |
807 | tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, | |
808 | tm.tm_min, tm.tm_sec); | |
809 | } | |
810 | if (i2c_smbus_write_byte_data(client, | |
811 | M41T80_REG_ALARM_HOUR, | |
812 | rc & ~M41T80_ALHOUR_HT) < 0) | |
813 | goto ht_err; | |
814 | } | |
815 | ||
816 | /* Make sure ST (stop) bit is cleared */ | |
817 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); | |
818 | if (rc < 0) | |
819 | goto st_err; | |
820 | ||
821 | if (rc & M41T80_SEC_ST) { | |
822 | if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, | |
823 | rc & ~M41T80_SEC_ST) < 0) | |
824 | goto st_err; | |
825 | } | |
826 | ||
827 | rc = m41t80_sysfs_register(&client->dev); | |
828 | if (rc) | |
829 | goto exit; | |
830 | ||
617780d2 | 831 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
3760f736 | 832 | if (clientdata->features & M41T80_FEATURE_HT) { |
417607d0 | 833 | save_client = client; |
617780d2 AN |
834 | rc = misc_register(&wdt_dev); |
835 | if (rc) | |
836 | goto exit; | |
837 | rc = register_reboot_notifier(&wdt_notifier); | |
838 | if (rc) { | |
839 | misc_deregister(&wdt_dev); | |
840 | goto exit; | |
841 | } | |
617780d2 AN |
842 | } |
843 | #endif | |
caaff562 AN |
844 | return 0; |
845 | ||
846 | st_err: | |
847 | rc = -EIO; | |
848 | dev_err(&client->dev, "Can't clear ST bit\n"); | |
849 | goto exit; | |
850 | ht_err: | |
851 | rc = -EIO; | |
852 | dev_err(&client->dev, "Can't clear HT bit\n"); | |
853 | goto exit; | |
854 | ||
855 | exit: | |
856 | if (rtc) | |
857 | rtc_device_unregister(rtc); | |
858 | kfree(clientdata); | |
859 | return rc; | |
860 | } | |
861 | ||
862 | static int m41t80_remove(struct i2c_client *client) | |
863 | { | |
864 | struct m41t80_data *clientdata = i2c_get_clientdata(client); | |
865 | struct rtc_device *rtc = clientdata->rtc; | |
866 | ||
617780d2 | 867 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
3760f736 | 868 | if (clientdata->features & M41T80_FEATURE_HT) { |
617780d2 AN |
869 | misc_deregister(&wdt_dev); |
870 | unregister_reboot_notifier(&wdt_notifier); | |
871 | } | |
872 | #endif | |
caaff562 AN |
873 | if (rtc) |
874 | rtc_device_unregister(rtc); | |
875 | kfree(clientdata); | |
876 | ||
877 | return 0; | |
878 | } | |
879 | ||
880 | static struct i2c_driver m41t80_driver = { | |
881 | .driver = { | |
afe1ab4d | 882 | .name = "rtc-m41t80", |
caaff562 AN |
883 | }, |
884 | .probe = m41t80_probe, | |
885 | .remove = m41t80_remove, | |
3760f736 | 886 | .id_table = m41t80_id, |
caaff562 AN |
887 | }; |
888 | ||
889 | static int __init m41t80_rtc_init(void) | |
890 | { | |
891 | return i2c_add_driver(&m41t80_driver); | |
892 | } | |
893 | ||
894 | static void __exit m41t80_rtc_exit(void) | |
895 | { | |
896 | i2c_del_driver(&m41t80_driver); | |
897 | } | |
898 | ||
899 | MODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); | |
900 | MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); | |
901 | MODULE_LICENSE("GPL"); | |
902 | MODULE_VERSION(DRV_VERSION); | |
903 | ||
904 | module_init(m41t80_rtc_init); | |
905 | module_exit(m41t80_rtc_exit); |