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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> |
613655fa | 23 | #include <linux/mutex.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 */ | |
f30281f4 | 67 | #define M41T80_FEATURE_SQ_ALT (1 << 4) /* RSx bits are in reg 4 */ |
caaff562 AN |
68 | |
69 | #define DRV_VERSION "0.05" | |
70 | ||
613655fa | 71 | static DEFINE_MUTEX(m41t80_rtc_mutex); |
3760f736 | 72 | static const struct i2c_device_id m41t80_id[] = { |
f30281f4 | 73 | { "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT }, |
d3a126fc SF |
74 | { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD }, |
75 | { "m41t80", M41T80_FEATURE_SQ }, | |
76 | { "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ}, | |
77 | { "m41t81s", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
78 | { "m41t82", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
79 | { "m41t83", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
80 | { "m41st84", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
81 | { "m41st85", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
82 | { "m41st87", M41T80_FEATURE_HT | M41T80_FEATURE_BL | M41T80_FEATURE_SQ }, | |
3760f736 | 83 | { } |
caaff562 | 84 | }; |
3760f736 | 85 | MODULE_DEVICE_TABLE(i2c, m41t80_id); |
caaff562 AN |
86 | |
87 | struct m41t80_data { | |
3760f736 | 88 | u8 features; |
caaff562 AN |
89 | struct rtc_device *rtc; |
90 | }; | |
91 | ||
92 | static int m41t80_get_datetime(struct i2c_client *client, | |
93 | struct rtc_time *tm) | |
94 | { | |
95 | u8 buf[M41T80_DATETIME_REG_SIZE], dt_addr[1] = { M41T80_REG_SEC }; | |
96 | struct i2c_msg msgs[] = { | |
97 | { | |
98 | .addr = client->addr, | |
99 | .flags = 0, | |
100 | .len = 1, | |
101 | .buf = dt_addr, | |
102 | }, | |
103 | { | |
104 | .addr = client->addr, | |
105 | .flags = I2C_M_RD, | |
106 | .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, | |
107 | .buf = buf + M41T80_REG_SEC, | |
108 | }, | |
109 | }; | |
110 | ||
111 | if (i2c_transfer(client->adapter, msgs, 2) < 0) { | |
112 | dev_err(&client->dev, "read error\n"); | |
113 | return -EIO; | |
114 | } | |
115 | ||
fe20ba70 AB |
116 | tm->tm_sec = bcd2bin(buf[M41T80_REG_SEC] & 0x7f); |
117 | tm->tm_min = bcd2bin(buf[M41T80_REG_MIN] & 0x7f); | |
118 | tm->tm_hour = bcd2bin(buf[M41T80_REG_HOUR] & 0x3f); | |
119 | tm->tm_mday = bcd2bin(buf[M41T80_REG_DAY] & 0x3f); | |
caaff562 | 120 | tm->tm_wday = buf[M41T80_REG_WDAY] & 0x07; |
fe20ba70 | 121 | tm->tm_mon = bcd2bin(buf[M41T80_REG_MON] & 0x1f) - 1; |
caaff562 AN |
122 | |
123 | /* assume 20YY not 19YY, and ignore the Century Bit */ | |
fe20ba70 | 124 | tm->tm_year = bcd2bin(buf[M41T80_REG_YEAR]) + 100; |
b485fe5e | 125 | return rtc_valid_tm(tm); |
caaff562 AN |
126 | } |
127 | ||
128 | /* Sets the given date and time to the real time clock. */ | |
129 | static int m41t80_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
130 | { | |
131 | u8 wbuf[1 + M41T80_DATETIME_REG_SIZE]; | |
132 | u8 *buf = &wbuf[1]; | |
133 | u8 dt_addr[1] = { M41T80_REG_SEC }; | |
134 | struct i2c_msg msgs_in[] = { | |
135 | { | |
136 | .addr = client->addr, | |
137 | .flags = 0, | |
138 | .len = 1, | |
139 | .buf = dt_addr, | |
140 | }, | |
141 | { | |
142 | .addr = client->addr, | |
143 | .flags = I2C_M_RD, | |
144 | .len = M41T80_DATETIME_REG_SIZE - M41T80_REG_SEC, | |
145 | .buf = buf + M41T80_REG_SEC, | |
146 | }, | |
147 | }; | |
148 | struct i2c_msg msgs[] = { | |
149 | { | |
150 | .addr = client->addr, | |
151 | .flags = 0, | |
152 | .len = 1 + M41T80_DATETIME_REG_SIZE, | |
153 | .buf = wbuf, | |
154 | }, | |
155 | }; | |
156 | ||
157 | /* Read current reg values into buf[1..7] */ | |
158 | if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { | |
159 | dev_err(&client->dev, "read error\n"); | |
160 | return -EIO; | |
161 | } | |
162 | ||
163 | wbuf[0] = 0; /* offset into rtc's regs */ | |
164 | /* Merge time-data and register flags into buf[0..7] */ | |
165 | buf[M41T80_REG_SSEC] = 0; | |
166 | buf[M41T80_REG_SEC] = | |
fe20ba70 | 167 | bin2bcd(tm->tm_sec) | (buf[M41T80_REG_SEC] & ~0x7f); |
caaff562 | 168 | buf[M41T80_REG_MIN] = |
fe20ba70 | 169 | bin2bcd(tm->tm_min) | (buf[M41T80_REG_MIN] & ~0x7f); |
caaff562 | 170 | buf[M41T80_REG_HOUR] = |
fe20ba70 | 171 | bin2bcd(tm->tm_hour) | (buf[M41T80_REG_HOUR] & ~0x3f) ; |
caaff562 AN |
172 | buf[M41T80_REG_WDAY] = |
173 | (tm->tm_wday & 0x07) | (buf[M41T80_REG_WDAY] & ~0x07); | |
174 | buf[M41T80_REG_DAY] = | |
fe20ba70 | 175 | bin2bcd(tm->tm_mday) | (buf[M41T80_REG_DAY] & ~0x3f); |
caaff562 | 176 | buf[M41T80_REG_MON] = |
fe20ba70 | 177 | bin2bcd(tm->tm_mon + 1) | (buf[M41T80_REG_MON] & ~0x1f); |
caaff562 | 178 | /* assume 20YY not 19YY */ |
fe20ba70 | 179 | buf[M41T80_REG_YEAR] = bin2bcd(tm->tm_year % 100); |
caaff562 AN |
180 | |
181 | if (i2c_transfer(client->adapter, msgs, 1) != 1) { | |
182 | dev_err(&client->dev, "write error\n"); | |
183 | return -EIO; | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | #if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE) | |
189 | static int m41t80_rtc_proc(struct device *dev, struct seq_file *seq) | |
190 | { | |
191 | struct i2c_client *client = to_i2c_client(dev); | |
192 | struct m41t80_data *clientdata = i2c_get_clientdata(client); | |
193 | u8 reg; | |
194 | ||
3760f736 | 195 | if (clientdata->features & M41T80_FEATURE_BL) { |
caaff562 AN |
196 | reg = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); |
197 | seq_printf(seq, "battery\t\t: %s\n", | |
198 | (reg & M41T80_FLAGS_BATT_LOW) ? "exhausted" : "ok"); | |
199 | } | |
200 | return 0; | |
201 | } | |
202 | #else | |
203 | #define m41t80_rtc_proc NULL | |
204 | #endif | |
205 | ||
206 | static int m41t80_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
207 | { | |
208 | return m41t80_get_datetime(to_i2c_client(dev), tm); | |
209 | } | |
210 | ||
211 | static int m41t80_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
212 | { | |
213 | return m41t80_set_datetime(to_i2c_client(dev), tm); | |
214 | } | |
215 | ||
216 | #if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE) | |
217 | static int | |
218 | m41t80_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
219 | { | |
220 | struct i2c_client *client = to_i2c_client(dev); | |
221 | int rc; | |
222 | ||
223 | switch (cmd) { | |
224 | case RTC_AIE_OFF: | |
225 | case RTC_AIE_ON: | |
226 | break; | |
227 | default: | |
228 | return -ENOIOCTLCMD; | |
229 | } | |
230 | ||
231 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); | |
232 | if (rc < 0) | |
233 | goto err; | |
234 | switch (cmd) { | |
235 | case RTC_AIE_OFF: | |
236 | rc &= ~M41T80_ALMON_AFE; | |
237 | break; | |
238 | case RTC_AIE_ON: | |
239 | rc |= M41T80_ALMON_AFE; | |
240 | break; | |
241 | } | |
242 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) | |
243 | goto err; | |
244 | return 0; | |
245 | err: | |
246 | return -EIO; | |
247 | } | |
248 | #else | |
249 | #define m41t80_rtc_ioctl NULL | |
250 | #endif | |
251 | ||
252 | static int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
253 | { | |
254 | struct i2c_client *client = to_i2c_client(dev); | |
255 | u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; | |
256 | u8 *buf = &wbuf[1]; | |
257 | u8 *reg = buf - M41T80_REG_ALARM_MON; | |
258 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; | |
259 | struct i2c_msg msgs_in[] = { | |
260 | { | |
261 | .addr = client->addr, | |
262 | .flags = 0, | |
263 | .len = 1, | |
264 | .buf = dt_addr, | |
265 | }, | |
266 | { | |
267 | .addr = client->addr, | |
268 | .flags = I2C_M_RD, | |
269 | .len = M41T80_ALARM_REG_SIZE, | |
270 | .buf = buf, | |
271 | }, | |
272 | }; | |
273 | struct i2c_msg msgs[] = { | |
274 | { | |
275 | .addr = client->addr, | |
276 | .flags = 0, | |
277 | .len = 1 + M41T80_ALARM_REG_SIZE, | |
278 | .buf = wbuf, | |
279 | }, | |
280 | }; | |
281 | ||
282 | if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { | |
283 | dev_err(&client->dev, "read error\n"); | |
284 | return -EIO; | |
285 | } | |
286 | reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); | |
287 | reg[M41T80_REG_ALARM_DAY] = 0; | |
288 | reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); | |
289 | reg[M41T80_REG_ALARM_MIN] = 0; | |
290 | reg[M41T80_REG_ALARM_SEC] = 0; | |
291 | ||
292 | wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ | |
293 | reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? | |
fe20ba70 | 294 | bin2bcd(t->time.tm_sec) : 0x80; |
caaff562 | 295 | reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? |
fe20ba70 | 296 | bin2bcd(t->time.tm_min) : 0x80; |
caaff562 | 297 | reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? |
fe20ba70 | 298 | bin2bcd(t->time.tm_hour) : 0x80; |
caaff562 | 299 | reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? |
fe20ba70 | 300 | bin2bcd(t->time.tm_mday) : 0x80; |
caaff562 | 301 | if (t->time.tm_mon >= 0) |
fe20ba70 | 302 | reg[M41T80_REG_ALARM_MON] |= bin2bcd(t->time.tm_mon + 1); |
caaff562 AN |
303 | else |
304 | reg[M41T80_REG_ALARM_DAY] |= 0x40; | |
305 | ||
306 | if (i2c_transfer(client->adapter, msgs, 1) != 1) { | |
307 | dev_err(&client->dev, "write error\n"); | |
308 | return -EIO; | |
309 | } | |
310 | ||
311 | if (t->enabled) { | |
312 | reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; | |
313 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
314 | reg[M41T80_REG_ALARM_MON]) < 0) { | |
315 | dev_err(&client->dev, "write error\n"); | |
316 | return -EIO; | |
317 | } | |
318 | } | |
319 | return 0; | |
320 | } | |
321 | ||
322 | static int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
323 | { | |
324 | struct i2c_client *client = to_i2c_client(dev); | |
325 | u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ | |
326 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; | |
327 | u8 *reg = buf - M41T80_REG_ALARM_MON; | |
328 | struct i2c_msg msgs[] = { | |
329 | { | |
330 | .addr = client->addr, | |
331 | .flags = 0, | |
332 | .len = 1, | |
333 | .buf = dt_addr, | |
334 | }, | |
335 | { | |
336 | .addr = client->addr, | |
337 | .flags = I2C_M_RD, | |
338 | .len = M41T80_ALARM_REG_SIZE + 1, | |
339 | .buf = buf, | |
340 | }, | |
341 | }; | |
342 | ||
343 | if (i2c_transfer(client->adapter, msgs, 2) < 0) { | |
344 | dev_err(&client->dev, "read error\n"); | |
345 | return -EIO; | |
346 | } | |
347 | t->time.tm_sec = -1; | |
348 | t->time.tm_min = -1; | |
349 | t->time.tm_hour = -1; | |
350 | t->time.tm_mday = -1; | |
351 | t->time.tm_mon = -1; | |
352 | if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) | |
fe20ba70 | 353 | t->time.tm_sec = bcd2bin(reg[M41T80_REG_ALARM_SEC] & 0x7f); |
caaff562 | 354 | if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) |
fe20ba70 | 355 | t->time.tm_min = bcd2bin(reg[M41T80_REG_ALARM_MIN] & 0x7f); |
caaff562 | 356 | if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) |
fe20ba70 | 357 | t->time.tm_hour = bcd2bin(reg[M41T80_REG_ALARM_HOUR] & 0x3f); |
caaff562 | 358 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) |
fe20ba70 | 359 | t->time.tm_mday = bcd2bin(reg[M41T80_REG_ALARM_DAY] & 0x3f); |
caaff562 | 360 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) |
fe20ba70 | 361 | t->time.tm_mon = bcd2bin(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; |
caaff562 AN |
362 | t->time.tm_year = -1; |
363 | t->time.tm_wday = -1; | |
364 | t->time.tm_yday = -1; | |
365 | t->time.tm_isdst = -1; | |
366 | t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); | |
367 | t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); | |
408929be | 368 | return 0; |
caaff562 AN |
369 | } |
370 | ||
371 | static struct rtc_class_ops m41t80_rtc_ops = { | |
372 | .read_time = m41t80_rtc_read_time, | |
373 | .set_time = m41t80_rtc_set_time, | |
374 | .read_alarm = m41t80_rtc_read_alarm, | |
375 | .set_alarm = m41t80_rtc_set_alarm, | |
376 | .proc = m41t80_rtc_proc, | |
377 | .ioctl = m41t80_rtc_ioctl, | |
378 | }; | |
379 | ||
380 | #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) | |
381 | static ssize_t m41t80_sysfs_show_flags(struct device *dev, | |
382 | struct device_attribute *attr, char *buf) | |
383 | { | |
384 | struct i2c_client *client = to_i2c_client(dev); | |
385 | int val; | |
386 | ||
387 | val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); | |
388 | if (val < 0) | |
389 | return -EIO; | |
390 | return sprintf(buf, "%#x\n", val); | |
391 | } | |
392 | static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); | |
393 | ||
394 | static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, | |
395 | struct device_attribute *attr, char *buf) | |
396 | { | |
397 | struct i2c_client *client = to_i2c_client(dev); | |
d3a126fc | 398 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
f30281f4 | 399 | int val, reg_sqw; |
caaff562 | 400 | |
d3a126fc SF |
401 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
402 | return -EINVAL; | |
403 | ||
f30281f4 DG |
404 | reg_sqw = M41T80_REG_SQW; |
405 | if (clientdata->features & M41T80_FEATURE_SQ_ALT) | |
406 | reg_sqw = M41T80_REG_WDAY; | |
407 | val = i2c_smbus_read_byte_data(client, reg_sqw); | |
caaff562 AN |
408 | if (val < 0) |
409 | return -EIO; | |
410 | val = (val >> 4) & 0xf; | |
411 | switch (val) { | |
412 | case 0: | |
413 | break; | |
414 | case 1: | |
415 | val = 32768; | |
416 | break; | |
417 | default: | |
418 | val = 32768 >> val; | |
419 | } | |
420 | return sprintf(buf, "%d\n", val); | |
421 | } | |
422 | static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, | |
423 | struct device_attribute *attr, | |
424 | const char *buf, size_t count) | |
425 | { | |
426 | struct i2c_client *client = to_i2c_client(dev); | |
d3a126fc | 427 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
f30281f4 | 428 | int almon, sqw, reg_sqw; |
caaff562 AN |
429 | int val = simple_strtoul(buf, NULL, 0); |
430 | ||
d3a126fc SF |
431 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
432 | return -EINVAL; | |
433 | ||
caaff562 AN |
434 | if (val) { |
435 | if (!is_power_of_2(val)) | |
436 | return -EINVAL; | |
437 | val = ilog2(val); | |
438 | if (val == 15) | |
439 | val = 1; | |
440 | else if (val < 14) | |
441 | val = 15 - val; | |
442 | else | |
443 | return -EINVAL; | |
444 | } | |
445 | /* disable SQW, set SQW frequency & re-enable */ | |
446 | almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); | |
447 | if (almon < 0) | |
448 | return -EIO; | |
f30281f4 DG |
449 | reg_sqw = M41T80_REG_SQW; |
450 | if (clientdata->features & M41T80_FEATURE_SQ_ALT) | |
451 | reg_sqw = M41T80_REG_WDAY; | |
452 | sqw = i2c_smbus_read_byte_data(client, reg_sqw); | |
caaff562 AN |
453 | if (sqw < 0) |
454 | return -EIO; | |
455 | sqw = (sqw & 0x0f) | (val << 4); | |
456 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
457 | almon & ~M41T80_ALMON_SQWE) < 0 || | |
f30281f4 | 458 | i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0) |
caaff562 AN |
459 | return -EIO; |
460 | if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
461 | almon | M41T80_ALMON_SQWE) < 0) | |
462 | return -EIO; | |
463 | return count; | |
464 | } | |
465 | static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, | |
466 | m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); | |
467 | ||
468 | static struct attribute *attrs[] = { | |
469 | &dev_attr_flags.attr, | |
470 | &dev_attr_sqwfreq.attr, | |
471 | NULL, | |
472 | }; | |
473 | static struct attribute_group attr_group = { | |
474 | .attrs = attrs, | |
475 | }; | |
476 | ||
477 | static int m41t80_sysfs_register(struct device *dev) | |
478 | { | |
479 | return sysfs_create_group(&dev->kobj, &attr_group); | |
480 | } | |
481 | #else | |
482 | static int m41t80_sysfs_register(struct device *dev) | |
483 | { | |
484 | return 0; | |
485 | } | |
486 | #endif | |
487 | ||
617780d2 AN |
488 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
489 | /* | |
490 | ***************************************************************************** | |
491 | * | |
492 | * Watchdog Driver | |
493 | * | |
494 | ***************************************************************************** | |
495 | */ | |
496 | static struct i2c_client *save_client; | |
497 | ||
498 | /* Default margin */ | |
499 | #define WD_TIMO 60 /* 1..31 seconds */ | |
500 | ||
501 | static int wdt_margin = WD_TIMO; | |
502 | module_param(wdt_margin, int, 0); | |
503 | MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); | |
504 | ||
505 | static unsigned long wdt_is_open; | |
506 | static int boot_flag; | |
507 | ||
508 | /** | |
509 | * wdt_ping: | |
510 | * | |
511 | * Reload counter one with the watchdog timeout. We don't bother reloading | |
512 | * the cascade counter. | |
513 | */ | |
514 | static void wdt_ping(void) | |
515 | { | |
516 | unsigned char i2c_data[2]; | |
517 | struct i2c_msg msgs1[1] = { | |
518 | { | |
519 | .addr = save_client->addr, | |
520 | .flags = 0, | |
521 | .len = 2, | |
522 | .buf = i2c_data, | |
523 | }, | |
524 | }; | |
d3a126fc SF |
525 | struct m41t80_data *clientdata = i2c_get_clientdata(save_client); |
526 | ||
617780d2 AN |
527 | i2c_data[0] = 0x09; /* watchdog register */ |
528 | ||
529 | if (wdt_margin > 31) | |
530 | i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ | |
531 | else | |
532 | /* | |
533 | * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) | |
534 | */ | |
535 | i2c_data[1] = wdt_margin<<2 | 0x82; | |
536 | ||
d3a126fc SF |
537 | /* |
538 | * M41T65 has three bits for watchdog resolution. Don't set bit 7, as | |
539 | * that would be an invalid resolution. | |
540 | */ | |
541 | if (clientdata->features & M41T80_FEATURE_WD) | |
542 | i2c_data[1] &= ~M41T80_WATCHDOG_RB2; | |
543 | ||
617780d2 AN |
544 | i2c_transfer(save_client->adapter, msgs1, 1); |
545 | } | |
546 | ||
547 | /** | |
548 | * wdt_disable: | |
549 | * | |
550 | * disables watchdog. | |
551 | */ | |
552 | static void wdt_disable(void) | |
553 | { | |
554 | unsigned char i2c_data[2], i2c_buf[0x10]; | |
555 | struct i2c_msg msgs0[2] = { | |
556 | { | |
557 | .addr = save_client->addr, | |
558 | .flags = 0, | |
559 | .len = 1, | |
560 | .buf = i2c_data, | |
561 | }, | |
562 | { | |
563 | .addr = save_client->addr, | |
564 | .flags = I2C_M_RD, | |
565 | .len = 1, | |
566 | .buf = i2c_buf, | |
567 | }, | |
568 | }; | |
569 | struct i2c_msg msgs1[1] = { | |
570 | { | |
571 | .addr = save_client->addr, | |
572 | .flags = 0, | |
573 | .len = 2, | |
574 | .buf = i2c_data, | |
575 | }, | |
576 | }; | |
577 | ||
578 | i2c_data[0] = 0x09; | |
579 | i2c_transfer(save_client->adapter, msgs0, 2); | |
580 | ||
581 | i2c_data[0] = 0x09; | |
582 | i2c_data[1] = 0x00; | |
583 | i2c_transfer(save_client->adapter, msgs1, 1); | |
584 | } | |
585 | ||
586 | /** | |
587 | * wdt_write: | |
588 | * @file: file handle to the watchdog | |
589 | * @buf: buffer to write (unused as data does not matter here | |
590 | * @count: count of bytes | |
591 | * @ppos: pointer to the position to write. No seeks allowed | |
592 | * | |
593 | * A write to a watchdog device is defined as a keepalive signal. Any | |
594 | * write of data will do, as we we don't define content meaning. | |
595 | */ | |
596 | static ssize_t wdt_write(struct file *file, const char __user *buf, | |
597 | size_t count, loff_t *ppos) | |
598 | { | |
617780d2 AN |
599 | if (count) { |
600 | wdt_ping(); | |
601 | return 1; | |
602 | } | |
603 | return 0; | |
604 | } | |
605 | ||
606 | static ssize_t wdt_read(struct file *file, char __user *buf, | |
607 | size_t count, loff_t *ppos) | |
608 | { | |
609 | return 0; | |
610 | } | |
611 | ||
612 | /** | |
613 | * wdt_ioctl: | |
614 | * @inode: inode of the device | |
615 | * @file: file handle to the device | |
616 | * @cmd: watchdog command | |
617 | * @arg: argument pointer | |
618 | * | |
619 | * The watchdog API defines a common set of functions for all watchdogs | |
620 | * according to their available features. We only actually usefully support | |
621 | * querying capabilities and current status. | |
622 | */ | |
55929332 | 623 | static int wdt_ioctl(struct file *file, unsigned int cmd, |
617780d2 AN |
624 | unsigned long arg) |
625 | { | |
626 | int new_margin, rv; | |
627 | static struct watchdog_info ident = { | |
628 | .options = WDIOF_POWERUNDER | WDIOF_KEEPALIVEPING | | |
629 | WDIOF_SETTIMEOUT, | |
630 | .firmware_version = 1, | |
631 | .identity = "M41T80 WTD" | |
632 | }; | |
633 | ||
634 | switch (cmd) { | |
635 | case WDIOC_GETSUPPORT: | |
636 | return copy_to_user((struct watchdog_info __user *)arg, &ident, | |
637 | sizeof(ident)) ? -EFAULT : 0; | |
638 | ||
639 | case WDIOC_GETSTATUS: | |
640 | case WDIOC_GETBOOTSTATUS: | |
641 | return put_user(boot_flag, (int __user *)arg); | |
642 | case WDIOC_KEEPALIVE: | |
643 | wdt_ping(); | |
644 | return 0; | |
645 | case WDIOC_SETTIMEOUT: | |
646 | if (get_user(new_margin, (int __user *)arg)) | |
647 | return -EFAULT; | |
648 | /* Arbitrary, can't find the card's limits */ | |
649 | if (new_margin < 1 || new_margin > 124) | |
650 | return -EINVAL; | |
651 | wdt_margin = new_margin; | |
652 | wdt_ping(); | |
653 | /* Fall */ | |
654 | case WDIOC_GETTIMEOUT: | |
655 | return put_user(wdt_margin, (int __user *)arg); | |
656 | ||
657 | case WDIOC_SETOPTIONS: | |
658 | if (copy_from_user(&rv, (int __user *)arg, sizeof(int))) | |
659 | return -EFAULT; | |
660 | ||
661 | if (rv & WDIOS_DISABLECARD) { | |
4c228db0 | 662 | pr_info("rtc-m41t80: disable watchdog\n"); |
617780d2 AN |
663 | wdt_disable(); |
664 | } | |
665 | ||
666 | if (rv & WDIOS_ENABLECARD) { | |
4c228db0 | 667 | pr_info("rtc-m41t80: enable watchdog\n"); |
617780d2 AN |
668 | wdt_ping(); |
669 | } | |
670 | ||
671 | return -EINVAL; | |
672 | } | |
673 | return -ENOTTY; | |
674 | } | |
675 | ||
55929332 AB |
676 | static long wdt_unlocked_ioctl(struct file *file, unsigned int cmd, |
677 | unsigned long arg) | |
678 | { | |
679 | int ret; | |
680 | ||
613655fa | 681 | mutex_lock(&m41t80_rtc_mutex); |
55929332 | 682 | ret = wdt_ioctl(file, cmd, arg); |
613655fa | 683 | mutex_unlock(&m41t80_rtc_mutex); |
55929332 AB |
684 | |
685 | return ret; | |
686 | } | |
687 | ||
617780d2 AN |
688 | /** |
689 | * wdt_open: | |
690 | * @inode: inode of device | |
691 | * @file: file handle to device | |
692 | * | |
693 | */ | |
694 | static int wdt_open(struct inode *inode, struct file *file) | |
695 | { | |
696 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { | |
613655fa | 697 | mutex_lock(&m41t80_rtc_mutex); |
41012735 | 698 | if (test_and_set_bit(0, &wdt_is_open)) { |
613655fa | 699 | mutex_unlock(&m41t80_rtc_mutex); |
617780d2 | 700 | return -EBUSY; |
41012735 | 701 | } |
617780d2 AN |
702 | /* |
703 | * Activate | |
704 | */ | |
705 | wdt_is_open = 1; | |
613655fa | 706 | mutex_unlock(&m41t80_rtc_mutex); |
09eeb1f5 | 707 | return nonseekable_open(inode, file); |
617780d2 AN |
708 | } |
709 | return -ENODEV; | |
710 | } | |
711 | ||
712 | /** | |
713 | * wdt_close: | |
714 | * @inode: inode to board | |
715 | * @file: file handle to board | |
716 | * | |
717 | */ | |
718 | static int wdt_release(struct inode *inode, struct file *file) | |
719 | { | |
720 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) | |
721 | clear_bit(0, &wdt_is_open); | |
722 | return 0; | |
723 | } | |
724 | ||
725 | /** | |
726 | * notify_sys: | |
727 | * @this: our notifier block | |
728 | * @code: the event being reported | |
729 | * @unused: unused | |
730 | * | |
731 | * Our notifier is called on system shutdowns. We want to turn the card | |
732 | * off at reboot otherwise the machine will reboot again during memory | |
733 | * test or worse yet during the following fsck. This would suck, in fact | |
734 | * trust me - if it happens it does suck. | |
735 | */ | |
736 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
737 | void *unused) | |
738 | { | |
739 | if (code == SYS_DOWN || code == SYS_HALT) | |
740 | /* Disable Watchdog */ | |
741 | wdt_disable(); | |
742 | return NOTIFY_DONE; | |
743 | } | |
744 | ||
745 | static const struct file_operations wdt_fops = { | |
746 | .owner = THIS_MODULE, | |
747 | .read = wdt_read, | |
55929332 | 748 | .unlocked_ioctl = wdt_unlocked_ioctl, |
617780d2 AN |
749 | .write = wdt_write, |
750 | .open = wdt_open, | |
751 | .release = wdt_release, | |
6038f373 | 752 | .llseek = no_llseek, |
617780d2 AN |
753 | }; |
754 | ||
755 | static struct miscdevice wdt_dev = { | |
756 | .minor = WATCHDOG_MINOR, | |
757 | .name = "watchdog", | |
758 | .fops = &wdt_fops, | |
759 | }; | |
760 | ||
761 | /* | |
762 | * The WDT card needs to learn about soft shutdowns in order to | |
763 | * turn the timebomb registers off. | |
764 | */ | |
765 | static struct notifier_block wdt_notifier = { | |
766 | .notifier_call = wdt_notify_sys, | |
767 | }; | |
768 | #endif /* CONFIG_RTC_DRV_M41T80_WDT */ | |
769 | ||
caaff562 AN |
770 | /* |
771 | ***************************************************************************** | |
772 | * | |
773 | * Driver Interface | |
774 | * | |
775 | ***************************************************************************** | |
776 | */ | |
d2653e92 JD |
777 | static int m41t80_probe(struct i2c_client *client, |
778 | const struct i2c_device_id *id) | |
caaff562 | 779 | { |
3760f736 | 780 | int rc = 0; |
caaff562 AN |
781 | struct rtc_device *rtc = NULL; |
782 | struct rtc_time tm; | |
caaff562 AN |
783 | struct m41t80_data *clientdata = NULL; |
784 | ||
785 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | |
786 | | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
787 | rc = -ENODEV; | |
788 | goto exit; | |
789 | } | |
790 | ||
791 | dev_info(&client->dev, | |
792 | "chip found, driver version " DRV_VERSION "\n"); | |
793 | ||
caaff562 AN |
794 | clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); |
795 | if (!clientdata) { | |
796 | rc = -ENOMEM; | |
797 | goto exit; | |
798 | } | |
799 | ||
800 | rtc = rtc_device_register(client->name, &client->dev, | |
801 | &m41t80_rtc_ops, THIS_MODULE); | |
802 | if (IS_ERR(rtc)) { | |
803 | rc = PTR_ERR(rtc); | |
804 | rtc = NULL; | |
805 | goto exit; | |
806 | } | |
807 | ||
808 | clientdata->rtc = rtc; | |
3760f736 | 809 | clientdata->features = id->driver_data; |
caaff562 AN |
810 | i2c_set_clientdata(client, clientdata); |
811 | ||
812 | /* Make sure HT (Halt Update) bit is cleared */ | |
813 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); | |
814 | if (rc < 0) | |
815 | goto ht_err; | |
816 | ||
817 | if (rc & M41T80_ALHOUR_HT) { | |
3760f736 | 818 | if (clientdata->features & M41T80_FEATURE_HT) { |
caaff562 AN |
819 | m41t80_get_datetime(client, &tm); |
820 | dev_info(&client->dev, "HT bit was set!\n"); | |
821 | dev_info(&client->dev, | |
822 | "Power Down at " | |
823 | "%04i-%02i-%02i %02i:%02i:%02i\n", | |
824 | tm.tm_year + 1900, | |
825 | tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, | |
826 | tm.tm_min, tm.tm_sec); | |
827 | } | |
828 | if (i2c_smbus_write_byte_data(client, | |
829 | M41T80_REG_ALARM_HOUR, | |
830 | rc & ~M41T80_ALHOUR_HT) < 0) | |
831 | goto ht_err; | |
832 | } | |
833 | ||
834 | /* Make sure ST (stop) bit is cleared */ | |
835 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); | |
836 | if (rc < 0) | |
837 | goto st_err; | |
838 | ||
839 | if (rc & M41T80_SEC_ST) { | |
840 | if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, | |
841 | rc & ~M41T80_SEC_ST) < 0) | |
842 | goto st_err; | |
843 | } | |
844 | ||
845 | rc = m41t80_sysfs_register(&client->dev); | |
846 | if (rc) | |
847 | goto exit; | |
848 | ||
617780d2 | 849 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
3760f736 | 850 | if (clientdata->features & M41T80_FEATURE_HT) { |
417607d0 | 851 | save_client = client; |
617780d2 AN |
852 | rc = misc_register(&wdt_dev); |
853 | if (rc) | |
854 | goto exit; | |
855 | rc = register_reboot_notifier(&wdt_notifier); | |
856 | if (rc) { | |
857 | misc_deregister(&wdt_dev); | |
858 | goto exit; | |
859 | } | |
617780d2 AN |
860 | } |
861 | #endif | |
caaff562 AN |
862 | return 0; |
863 | ||
864 | st_err: | |
865 | rc = -EIO; | |
866 | dev_err(&client->dev, "Can't clear ST bit\n"); | |
867 | goto exit; | |
868 | ht_err: | |
869 | rc = -EIO; | |
870 | dev_err(&client->dev, "Can't clear HT bit\n"); | |
871 | goto exit; | |
872 | ||
873 | exit: | |
874 | if (rtc) | |
875 | rtc_device_unregister(rtc); | |
876 | kfree(clientdata); | |
877 | return rc; | |
878 | } | |
879 | ||
880 | static int m41t80_remove(struct i2c_client *client) | |
881 | { | |
882 | struct m41t80_data *clientdata = i2c_get_clientdata(client); | |
883 | struct rtc_device *rtc = clientdata->rtc; | |
884 | ||
617780d2 | 885 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
3760f736 | 886 | if (clientdata->features & M41T80_FEATURE_HT) { |
617780d2 AN |
887 | misc_deregister(&wdt_dev); |
888 | unregister_reboot_notifier(&wdt_notifier); | |
889 | } | |
890 | #endif | |
caaff562 AN |
891 | if (rtc) |
892 | rtc_device_unregister(rtc); | |
893 | kfree(clientdata); | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | static struct i2c_driver m41t80_driver = { | |
899 | .driver = { | |
afe1ab4d | 900 | .name = "rtc-m41t80", |
caaff562 AN |
901 | }, |
902 | .probe = m41t80_probe, | |
903 | .remove = m41t80_remove, | |
3760f736 | 904 | .id_table = m41t80_id, |
caaff562 AN |
905 | }; |
906 | ||
907 | static int __init m41t80_rtc_init(void) | |
908 | { | |
909 | return i2c_add_driver(&m41t80_driver); | |
910 | } | |
911 | ||
912 | static void __exit m41t80_rtc_exit(void) | |
913 | { | |
914 | i2c_del_driver(&m41t80_driver); | |
915 | } | |
916 | ||
917 | MODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); | |
918 | MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); | |
919 | MODULE_LICENSE("GPL"); | |
920 | MODULE_VERSION(DRV_VERSION); | |
921 | ||
922 | module_init(m41t80_rtc_init); | |
923 | module_exit(m41t80_rtc_exit); |