Commit | Line | Data |
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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 | ||
16380c15 | 216 | static int m41t80_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) |
caaff562 AN |
217 | { |
218 | struct i2c_client *client = to_i2c_client(dev); | |
219 | int rc; | |
220 | ||
caaff562 AN |
221 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); |
222 | if (rc < 0) | |
223 | goto err; | |
16380c15 JS |
224 | |
225 | if (enabled) | |
caaff562 | 226 | rc |= M41T80_ALMON_AFE; |
16380c15 JS |
227 | else |
228 | rc &= ~M41T80_ALMON_AFE; | |
229 | ||
caaff562 AN |
230 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, rc) < 0) |
231 | goto err; | |
16380c15 | 232 | |
caaff562 AN |
233 | return 0; |
234 | err: | |
235 | return -EIO; | |
236 | } | |
caaff562 AN |
237 | |
238 | static int m41t80_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
239 | { | |
240 | struct i2c_client *client = to_i2c_client(dev); | |
241 | u8 wbuf[1 + M41T80_ALARM_REG_SIZE]; | |
242 | u8 *buf = &wbuf[1]; | |
243 | u8 *reg = buf - M41T80_REG_ALARM_MON; | |
244 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; | |
245 | struct i2c_msg msgs_in[] = { | |
246 | { | |
247 | .addr = client->addr, | |
248 | .flags = 0, | |
249 | .len = 1, | |
250 | .buf = dt_addr, | |
251 | }, | |
252 | { | |
253 | .addr = client->addr, | |
254 | .flags = I2C_M_RD, | |
255 | .len = M41T80_ALARM_REG_SIZE, | |
256 | .buf = buf, | |
257 | }, | |
258 | }; | |
259 | struct i2c_msg msgs[] = { | |
260 | { | |
261 | .addr = client->addr, | |
262 | .flags = 0, | |
263 | .len = 1 + M41T80_ALARM_REG_SIZE, | |
264 | .buf = wbuf, | |
265 | }, | |
266 | }; | |
267 | ||
268 | if (i2c_transfer(client->adapter, msgs_in, 2) < 0) { | |
269 | dev_err(&client->dev, "read error\n"); | |
270 | return -EIO; | |
271 | } | |
272 | reg[M41T80_REG_ALARM_MON] &= ~(0x1f | M41T80_ALMON_AFE); | |
273 | reg[M41T80_REG_ALARM_DAY] = 0; | |
274 | reg[M41T80_REG_ALARM_HOUR] &= ~(0x3f | 0x80); | |
275 | reg[M41T80_REG_ALARM_MIN] = 0; | |
276 | reg[M41T80_REG_ALARM_SEC] = 0; | |
277 | ||
278 | wbuf[0] = M41T80_REG_ALARM_MON; /* offset into rtc's regs */ | |
279 | reg[M41T80_REG_ALARM_SEC] |= t->time.tm_sec >= 0 ? | |
fe20ba70 | 280 | bin2bcd(t->time.tm_sec) : 0x80; |
caaff562 | 281 | reg[M41T80_REG_ALARM_MIN] |= t->time.tm_min >= 0 ? |
fe20ba70 | 282 | bin2bcd(t->time.tm_min) : 0x80; |
caaff562 | 283 | reg[M41T80_REG_ALARM_HOUR] |= t->time.tm_hour >= 0 ? |
fe20ba70 | 284 | bin2bcd(t->time.tm_hour) : 0x80; |
caaff562 | 285 | reg[M41T80_REG_ALARM_DAY] |= t->time.tm_mday >= 0 ? |
fe20ba70 | 286 | bin2bcd(t->time.tm_mday) : 0x80; |
caaff562 | 287 | if (t->time.tm_mon >= 0) |
fe20ba70 | 288 | reg[M41T80_REG_ALARM_MON] |= bin2bcd(t->time.tm_mon + 1); |
caaff562 AN |
289 | else |
290 | reg[M41T80_REG_ALARM_DAY] |= 0x40; | |
291 | ||
292 | if (i2c_transfer(client->adapter, msgs, 1) != 1) { | |
293 | dev_err(&client->dev, "write error\n"); | |
294 | return -EIO; | |
295 | } | |
296 | ||
297 | if (t->enabled) { | |
298 | reg[M41T80_REG_ALARM_MON] |= M41T80_ALMON_AFE; | |
299 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
300 | reg[M41T80_REG_ALARM_MON]) < 0) { | |
301 | dev_err(&client->dev, "write error\n"); | |
302 | return -EIO; | |
303 | } | |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
308 | static int m41t80_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
309 | { | |
310 | struct i2c_client *client = to_i2c_client(dev); | |
311 | u8 buf[M41T80_ALARM_REG_SIZE + 1]; /* all alarm regs and flags */ | |
312 | u8 dt_addr[1] = { M41T80_REG_ALARM_MON }; | |
313 | u8 *reg = buf - M41T80_REG_ALARM_MON; | |
314 | struct i2c_msg msgs[] = { | |
315 | { | |
316 | .addr = client->addr, | |
317 | .flags = 0, | |
318 | .len = 1, | |
319 | .buf = dt_addr, | |
320 | }, | |
321 | { | |
322 | .addr = client->addr, | |
323 | .flags = I2C_M_RD, | |
324 | .len = M41T80_ALARM_REG_SIZE + 1, | |
325 | .buf = buf, | |
326 | }, | |
327 | }; | |
328 | ||
329 | if (i2c_transfer(client->adapter, msgs, 2) < 0) { | |
330 | dev_err(&client->dev, "read error\n"); | |
331 | return -EIO; | |
332 | } | |
333 | t->time.tm_sec = -1; | |
334 | t->time.tm_min = -1; | |
335 | t->time.tm_hour = -1; | |
336 | t->time.tm_mday = -1; | |
337 | t->time.tm_mon = -1; | |
338 | if (!(reg[M41T80_REG_ALARM_SEC] & 0x80)) | |
fe20ba70 | 339 | t->time.tm_sec = bcd2bin(reg[M41T80_REG_ALARM_SEC] & 0x7f); |
caaff562 | 340 | if (!(reg[M41T80_REG_ALARM_MIN] & 0x80)) |
fe20ba70 | 341 | t->time.tm_min = bcd2bin(reg[M41T80_REG_ALARM_MIN] & 0x7f); |
caaff562 | 342 | if (!(reg[M41T80_REG_ALARM_HOUR] & 0x80)) |
fe20ba70 | 343 | t->time.tm_hour = bcd2bin(reg[M41T80_REG_ALARM_HOUR] & 0x3f); |
caaff562 | 344 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x80)) |
fe20ba70 | 345 | t->time.tm_mday = bcd2bin(reg[M41T80_REG_ALARM_DAY] & 0x3f); |
caaff562 | 346 | if (!(reg[M41T80_REG_ALARM_DAY] & 0x40)) |
fe20ba70 | 347 | t->time.tm_mon = bcd2bin(reg[M41T80_REG_ALARM_MON] & 0x1f) - 1; |
caaff562 AN |
348 | t->time.tm_year = -1; |
349 | t->time.tm_wday = -1; | |
350 | t->time.tm_yday = -1; | |
351 | t->time.tm_isdst = -1; | |
352 | t->enabled = !!(reg[M41T80_REG_ALARM_MON] & M41T80_ALMON_AFE); | |
353 | t->pending = !!(reg[M41T80_REG_FLAGS] & M41T80_FLAGS_AF); | |
408929be | 354 | return 0; |
caaff562 AN |
355 | } |
356 | ||
357 | static struct rtc_class_ops m41t80_rtc_ops = { | |
358 | .read_time = m41t80_rtc_read_time, | |
359 | .set_time = m41t80_rtc_set_time, | |
c3b79770 JS |
360 | /* |
361 | * XXX - m41t80 alarm functionality is reported broken. | |
362 | * until it is fixed, don't register alarm functions. | |
363 | * | |
caaff562 AN |
364 | .read_alarm = m41t80_rtc_read_alarm, |
365 | .set_alarm = m41t80_rtc_set_alarm, | |
c3b79770 | 366 | */ |
caaff562 | 367 | .proc = m41t80_rtc_proc, |
c3b79770 JS |
368 | /* |
369 | * See above comment on broken alarm | |
370 | * | |
16380c15 | 371 | .alarm_irq_enable = m41t80_rtc_alarm_irq_enable, |
c3b79770 | 372 | */ |
caaff562 AN |
373 | }; |
374 | ||
375 | #if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE) | |
376 | static ssize_t m41t80_sysfs_show_flags(struct device *dev, | |
377 | struct device_attribute *attr, char *buf) | |
378 | { | |
379 | struct i2c_client *client = to_i2c_client(dev); | |
380 | int val; | |
381 | ||
382 | val = i2c_smbus_read_byte_data(client, M41T80_REG_FLAGS); | |
383 | if (val < 0) | |
384 | return -EIO; | |
385 | return sprintf(buf, "%#x\n", val); | |
386 | } | |
387 | static DEVICE_ATTR(flags, S_IRUGO, m41t80_sysfs_show_flags, NULL); | |
388 | ||
389 | static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev, | |
390 | struct device_attribute *attr, char *buf) | |
391 | { | |
392 | struct i2c_client *client = to_i2c_client(dev); | |
d3a126fc | 393 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
f30281f4 | 394 | int val, reg_sqw; |
caaff562 | 395 | |
d3a126fc SF |
396 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
397 | return -EINVAL; | |
398 | ||
f30281f4 DG |
399 | reg_sqw = M41T80_REG_SQW; |
400 | if (clientdata->features & M41T80_FEATURE_SQ_ALT) | |
401 | reg_sqw = M41T80_REG_WDAY; | |
402 | val = i2c_smbus_read_byte_data(client, reg_sqw); | |
caaff562 AN |
403 | if (val < 0) |
404 | return -EIO; | |
405 | val = (val >> 4) & 0xf; | |
406 | switch (val) { | |
407 | case 0: | |
408 | break; | |
409 | case 1: | |
410 | val = 32768; | |
411 | break; | |
412 | default: | |
413 | val = 32768 >> val; | |
414 | } | |
415 | return sprintf(buf, "%d\n", val); | |
416 | } | |
417 | static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev, | |
418 | struct device_attribute *attr, | |
419 | const char *buf, size_t count) | |
420 | { | |
421 | struct i2c_client *client = to_i2c_client(dev); | |
d3a126fc | 422 | struct m41t80_data *clientdata = i2c_get_clientdata(client); |
f30281f4 | 423 | int almon, sqw, reg_sqw; |
caaff562 AN |
424 | int val = simple_strtoul(buf, NULL, 0); |
425 | ||
d3a126fc SF |
426 | if (!(clientdata->features & M41T80_FEATURE_SQ)) |
427 | return -EINVAL; | |
428 | ||
caaff562 AN |
429 | if (val) { |
430 | if (!is_power_of_2(val)) | |
431 | return -EINVAL; | |
432 | val = ilog2(val); | |
433 | if (val == 15) | |
434 | val = 1; | |
435 | else if (val < 14) | |
436 | val = 15 - val; | |
437 | else | |
438 | return -EINVAL; | |
439 | } | |
440 | /* disable SQW, set SQW frequency & re-enable */ | |
441 | almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON); | |
442 | if (almon < 0) | |
443 | return -EIO; | |
f30281f4 DG |
444 | reg_sqw = M41T80_REG_SQW; |
445 | if (clientdata->features & M41T80_FEATURE_SQ_ALT) | |
446 | reg_sqw = M41T80_REG_WDAY; | |
447 | sqw = i2c_smbus_read_byte_data(client, reg_sqw); | |
caaff562 AN |
448 | if (sqw < 0) |
449 | return -EIO; | |
450 | sqw = (sqw & 0x0f) | (val << 4); | |
451 | if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
452 | almon & ~M41T80_ALMON_SQWE) < 0 || | |
f30281f4 | 453 | i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0) |
caaff562 AN |
454 | return -EIO; |
455 | if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON, | |
456 | almon | M41T80_ALMON_SQWE) < 0) | |
457 | return -EIO; | |
458 | return count; | |
459 | } | |
460 | static DEVICE_ATTR(sqwfreq, S_IRUGO | S_IWUSR, | |
461 | m41t80_sysfs_show_sqwfreq, m41t80_sysfs_set_sqwfreq); | |
462 | ||
463 | static struct attribute *attrs[] = { | |
464 | &dev_attr_flags.attr, | |
465 | &dev_attr_sqwfreq.attr, | |
466 | NULL, | |
467 | }; | |
468 | static struct attribute_group attr_group = { | |
469 | .attrs = attrs, | |
470 | }; | |
471 | ||
472 | static int m41t80_sysfs_register(struct device *dev) | |
473 | { | |
474 | return sysfs_create_group(&dev->kobj, &attr_group); | |
475 | } | |
476 | #else | |
477 | static int m41t80_sysfs_register(struct device *dev) | |
478 | { | |
479 | return 0; | |
480 | } | |
481 | #endif | |
482 | ||
617780d2 AN |
483 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
484 | /* | |
485 | ***************************************************************************** | |
486 | * | |
487 | * Watchdog Driver | |
488 | * | |
489 | ***************************************************************************** | |
490 | */ | |
491 | static struct i2c_client *save_client; | |
492 | ||
493 | /* Default margin */ | |
494 | #define WD_TIMO 60 /* 1..31 seconds */ | |
495 | ||
496 | static int wdt_margin = WD_TIMO; | |
497 | module_param(wdt_margin, int, 0); | |
498 | MODULE_PARM_DESC(wdt_margin, "Watchdog timeout in seconds (default 60s)"); | |
499 | ||
500 | static unsigned long wdt_is_open; | |
501 | static int boot_flag; | |
502 | ||
503 | /** | |
504 | * wdt_ping: | |
505 | * | |
506 | * Reload counter one with the watchdog timeout. We don't bother reloading | |
507 | * the cascade counter. | |
508 | */ | |
509 | static void wdt_ping(void) | |
510 | { | |
511 | unsigned char i2c_data[2]; | |
512 | struct i2c_msg msgs1[1] = { | |
513 | { | |
514 | .addr = save_client->addr, | |
515 | .flags = 0, | |
516 | .len = 2, | |
517 | .buf = i2c_data, | |
518 | }, | |
519 | }; | |
d3a126fc SF |
520 | struct m41t80_data *clientdata = i2c_get_clientdata(save_client); |
521 | ||
617780d2 AN |
522 | i2c_data[0] = 0x09; /* watchdog register */ |
523 | ||
524 | if (wdt_margin > 31) | |
525 | i2c_data[1] = (wdt_margin & 0xFC) | 0x83; /* resolution = 4s */ | |
526 | else | |
527 | /* | |
528 | * WDS = 1 (0x80), mulitplier = WD_TIMO, resolution = 1s (0x02) | |
529 | */ | |
530 | i2c_data[1] = wdt_margin<<2 | 0x82; | |
531 | ||
d3a126fc SF |
532 | /* |
533 | * M41T65 has three bits for watchdog resolution. Don't set bit 7, as | |
534 | * that would be an invalid resolution. | |
535 | */ | |
536 | if (clientdata->features & M41T80_FEATURE_WD) | |
537 | i2c_data[1] &= ~M41T80_WATCHDOG_RB2; | |
538 | ||
617780d2 AN |
539 | i2c_transfer(save_client->adapter, msgs1, 1); |
540 | } | |
541 | ||
542 | /** | |
543 | * wdt_disable: | |
544 | * | |
545 | * disables watchdog. | |
546 | */ | |
547 | static void wdt_disable(void) | |
548 | { | |
549 | unsigned char i2c_data[2], i2c_buf[0x10]; | |
550 | struct i2c_msg msgs0[2] = { | |
551 | { | |
552 | .addr = save_client->addr, | |
553 | .flags = 0, | |
554 | .len = 1, | |
555 | .buf = i2c_data, | |
556 | }, | |
557 | { | |
558 | .addr = save_client->addr, | |
559 | .flags = I2C_M_RD, | |
560 | .len = 1, | |
561 | .buf = i2c_buf, | |
562 | }, | |
563 | }; | |
564 | struct i2c_msg msgs1[1] = { | |
565 | { | |
566 | .addr = save_client->addr, | |
567 | .flags = 0, | |
568 | .len = 2, | |
569 | .buf = i2c_data, | |
570 | }, | |
571 | }; | |
572 | ||
573 | i2c_data[0] = 0x09; | |
574 | i2c_transfer(save_client->adapter, msgs0, 2); | |
575 | ||
576 | i2c_data[0] = 0x09; | |
577 | i2c_data[1] = 0x00; | |
578 | i2c_transfer(save_client->adapter, msgs1, 1); | |
579 | } | |
580 | ||
581 | /** | |
582 | * wdt_write: | |
583 | * @file: file handle to the watchdog | |
584 | * @buf: buffer to write (unused as data does not matter here | |
585 | * @count: count of bytes | |
586 | * @ppos: pointer to the position to write. No seeks allowed | |
587 | * | |
588 | * A write to a watchdog device is defined as a keepalive signal. Any | |
589 | * write of data will do, as we we don't define content meaning. | |
590 | */ | |
591 | static ssize_t wdt_write(struct file *file, const char __user *buf, | |
592 | size_t count, loff_t *ppos) | |
593 | { | |
617780d2 AN |
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 | */ | |
55929332 | 618 | static int wdt_ioctl(struct file *file, unsigned int cmd, |
617780d2 AN |
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 | ||
55929332 AB |
671 | static long wdt_unlocked_ioctl(struct file *file, unsigned int cmd, |
672 | unsigned long arg) | |
673 | { | |
674 | int ret; | |
675 | ||
613655fa | 676 | mutex_lock(&m41t80_rtc_mutex); |
55929332 | 677 | ret = wdt_ioctl(file, cmd, arg); |
613655fa | 678 | mutex_unlock(&m41t80_rtc_mutex); |
55929332 AB |
679 | |
680 | return ret; | |
681 | } | |
682 | ||
617780d2 AN |
683 | /** |
684 | * wdt_open: | |
685 | * @inode: inode of device | |
686 | * @file: file handle to device | |
687 | * | |
688 | */ | |
689 | static int wdt_open(struct inode *inode, struct file *file) | |
690 | { | |
691 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) { | |
613655fa | 692 | mutex_lock(&m41t80_rtc_mutex); |
41012735 | 693 | if (test_and_set_bit(0, &wdt_is_open)) { |
613655fa | 694 | mutex_unlock(&m41t80_rtc_mutex); |
617780d2 | 695 | return -EBUSY; |
41012735 | 696 | } |
617780d2 AN |
697 | /* |
698 | * Activate | |
699 | */ | |
700 | wdt_is_open = 1; | |
613655fa | 701 | mutex_unlock(&m41t80_rtc_mutex); |
09eeb1f5 | 702 | return nonseekable_open(inode, file); |
617780d2 AN |
703 | } |
704 | return -ENODEV; | |
705 | } | |
706 | ||
707 | /** | |
708 | * wdt_close: | |
709 | * @inode: inode to board | |
710 | * @file: file handle to board | |
711 | * | |
712 | */ | |
713 | static int wdt_release(struct inode *inode, struct file *file) | |
714 | { | |
715 | if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) | |
716 | clear_bit(0, &wdt_is_open); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | /** | |
721 | * notify_sys: | |
722 | * @this: our notifier block | |
723 | * @code: the event being reported | |
724 | * @unused: unused | |
725 | * | |
726 | * Our notifier is called on system shutdowns. We want to turn the card | |
727 | * off at reboot otherwise the machine will reboot again during memory | |
728 | * test or worse yet during the following fsck. This would suck, in fact | |
729 | * trust me - if it happens it does suck. | |
730 | */ | |
731 | static int wdt_notify_sys(struct notifier_block *this, unsigned long code, | |
732 | void *unused) | |
733 | { | |
734 | if (code == SYS_DOWN || code == SYS_HALT) | |
735 | /* Disable Watchdog */ | |
736 | wdt_disable(); | |
737 | return NOTIFY_DONE; | |
738 | } | |
739 | ||
740 | static const struct file_operations wdt_fops = { | |
741 | .owner = THIS_MODULE, | |
742 | .read = wdt_read, | |
55929332 | 743 | .unlocked_ioctl = wdt_unlocked_ioctl, |
617780d2 AN |
744 | .write = wdt_write, |
745 | .open = wdt_open, | |
746 | .release = wdt_release, | |
6038f373 | 747 | .llseek = no_llseek, |
617780d2 AN |
748 | }; |
749 | ||
750 | static struct miscdevice wdt_dev = { | |
751 | .minor = WATCHDOG_MINOR, | |
752 | .name = "watchdog", | |
753 | .fops = &wdt_fops, | |
754 | }; | |
755 | ||
756 | /* | |
757 | * The WDT card needs to learn about soft shutdowns in order to | |
758 | * turn the timebomb registers off. | |
759 | */ | |
760 | static struct notifier_block wdt_notifier = { | |
761 | .notifier_call = wdt_notify_sys, | |
762 | }; | |
763 | #endif /* CONFIG_RTC_DRV_M41T80_WDT */ | |
764 | ||
caaff562 AN |
765 | /* |
766 | ***************************************************************************** | |
767 | * | |
768 | * Driver Interface | |
769 | * | |
770 | ***************************************************************************** | |
771 | */ | |
d2653e92 JD |
772 | static int m41t80_probe(struct i2c_client *client, |
773 | const struct i2c_device_id *id) | |
caaff562 | 774 | { |
3760f736 | 775 | int rc = 0; |
caaff562 AN |
776 | struct rtc_device *rtc = NULL; |
777 | struct rtc_time tm; | |
caaff562 AN |
778 | struct m41t80_data *clientdata = NULL; |
779 | ||
780 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | |
781 | | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
782 | rc = -ENODEV; | |
783 | goto exit; | |
784 | } | |
785 | ||
786 | dev_info(&client->dev, | |
787 | "chip found, driver version " DRV_VERSION "\n"); | |
788 | ||
caaff562 AN |
789 | clientdata = kzalloc(sizeof(*clientdata), GFP_KERNEL); |
790 | if (!clientdata) { | |
791 | rc = -ENOMEM; | |
792 | goto exit; | |
793 | } | |
794 | ||
a015dbc1 JS |
795 | clientdata->features = id->driver_data; |
796 | i2c_set_clientdata(client, clientdata); | |
797 | ||
caaff562 AN |
798 | rtc = rtc_device_register(client->name, &client->dev, |
799 | &m41t80_rtc_ops, THIS_MODULE); | |
800 | if (IS_ERR(rtc)) { | |
801 | rc = PTR_ERR(rtc); | |
802 | rtc = NULL; | |
803 | goto exit; | |
804 | } | |
805 | ||
806 | clientdata->rtc = rtc; | |
caaff562 AN |
807 | |
808 | /* Make sure HT (Halt Update) bit is cleared */ | |
809 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_HOUR); | |
810 | if (rc < 0) | |
811 | goto ht_err; | |
812 | ||
813 | if (rc & M41T80_ALHOUR_HT) { | |
3760f736 | 814 | if (clientdata->features & M41T80_FEATURE_HT) { |
caaff562 AN |
815 | m41t80_get_datetime(client, &tm); |
816 | dev_info(&client->dev, "HT bit was set!\n"); | |
817 | dev_info(&client->dev, | |
818 | "Power Down at " | |
819 | "%04i-%02i-%02i %02i:%02i:%02i\n", | |
820 | tm.tm_year + 1900, | |
821 | tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, | |
822 | tm.tm_min, tm.tm_sec); | |
823 | } | |
824 | if (i2c_smbus_write_byte_data(client, | |
825 | M41T80_REG_ALARM_HOUR, | |
826 | rc & ~M41T80_ALHOUR_HT) < 0) | |
827 | goto ht_err; | |
828 | } | |
829 | ||
830 | /* Make sure ST (stop) bit is cleared */ | |
831 | rc = i2c_smbus_read_byte_data(client, M41T80_REG_SEC); | |
832 | if (rc < 0) | |
833 | goto st_err; | |
834 | ||
835 | if (rc & M41T80_SEC_ST) { | |
836 | if (i2c_smbus_write_byte_data(client, M41T80_REG_SEC, | |
837 | rc & ~M41T80_SEC_ST) < 0) | |
838 | goto st_err; | |
839 | } | |
840 | ||
841 | rc = m41t80_sysfs_register(&client->dev); | |
842 | if (rc) | |
843 | goto exit; | |
844 | ||
617780d2 | 845 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
3760f736 | 846 | if (clientdata->features & M41T80_FEATURE_HT) { |
417607d0 | 847 | save_client = client; |
617780d2 AN |
848 | rc = misc_register(&wdt_dev); |
849 | if (rc) | |
850 | goto exit; | |
851 | rc = register_reboot_notifier(&wdt_notifier); | |
852 | if (rc) { | |
853 | misc_deregister(&wdt_dev); | |
854 | goto exit; | |
855 | } | |
617780d2 AN |
856 | } |
857 | #endif | |
caaff562 AN |
858 | return 0; |
859 | ||
860 | st_err: | |
861 | rc = -EIO; | |
862 | dev_err(&client->dev, "Can't clear ST bit\n"); | |
863 | goto exit; | |
864 | ht_err: | |
865 | rc = -EIO; | |
866 | dev_err(&client->dev, "Can't clear HT bit\n"); | |
867 | goto exit; | |
868 | ||
869 | exit: | |
870 | if (rtc) | |
871 | rtc_device_unregister(rtc); | |
872 | kfree(clientdata); | |
873 | return rc; | |
874 | } | |
875 | ||
876 | static int m41t80_remove(struct i2c_client *client) | |
877 | { | |
878 | struct m41t80_data *clientdata = i2c_get_clientdata(client); | |
879 | struct rtc_device *rtc = clientdata->rtc; | |
880 | ||
617780d2 | 881 | #ifdef CONFIG_RTC_DRV_M41T80_WDT |
3760f736 | 882 | if (clientdata->features & M41T80_FEATURE_HT) { |
617780d2 AN |
883 | misc_deregister(&wdt_dev); |
884 | unregister_reboot_notifier(&wdt_notifier); | |
885 | } | |
886 | #endif | |
caaff562 AN |
887 | if (rtc) |
888 | rtc_device_unregister(rtc); | |
889 | kfree(clientdata); | |
890 | ||
891 | return 0; | |
892 | } | |
893 | ||
894 | static struct i2c_driver m41t80_driver = { | |
895 | .driver = { | |
afe1ab4d | 896 | .name = "rtc-m41t80", |
caaff562 AN |
897 | }, |
898 | .probe = m41t80_probe, | |
899 | .remove = m41t80_remove, | |
3760f736 | 900 | .id_table = m41t80_id, |
caaff562 AN |
901 | }; |
902 | ||
0abc9201 | 903 | module_i2c_driver(m41t80_driver); |
caaff562 AN |
904 | |
905 | MODULE_AUTHOR("Alexander Bigga <ab@mycable.de>"); | |
906 | MODULE_DESCRIPTION("ST Microelectronics M41T80 series RTC I2C Client Driver"); | |
907 | MODULE_LICENSE("GPL"); | |
908 | MODULE_VERSION(DRV_VERSION); |