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b5a82d62 AZ |
1 | /* |
2 | * An I2C driver for the Philips PCF8563 RTC | |
3 | * Copyright 2005-06 Tower Technologies | |
4 | * | |
5 | * Author: Alessandro Zummo <a.zummo@towertech.it> | |
6 | * Maintainers: http://www.nslu2-linux.org/ | |
7 | * | |
8 | * based on the other drivers in this same directory. | |
9 | * | |
10 | * http://www.semiconductors.philips.com/acrobat/datasheets/PCF8563-04.pdf | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | #include <linux/i2c.h> | |
18 | #include <linux/bcd.h> | |
19 | #include <linux/rtc.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
2113852b | 21 | #include <linux/module.h> |
8dccaf06 | 22 | #include <linux/of.h> |
23f809ee | 23 | #include <linux/err.h> |
b5a82d62 | 24 | |
e5fc9cc0 | 25 | #define DRV_VERSION "0.4.3" |
b5a82d62 AZ |
26 | |
27 | #define PCF8563_REG_ST1 0x00 /* status */ | |
28 | #define PCF8563_REG_ST2 0x01 | |
ede3e9d4 VD |
29 | #define PCF8563_BIT_AIE (1 << 1) |
30 | #define PCF8563_BIT_AF (1 << 3) | |
b5a82d62 AZ |
31 | |
32 | #define PCF8563_REG_SC 0x02 /* datetime */ | |
33 | #define PCF8563_REG_MN 0x03 | |
34 | #define PCF8563_REG_HR 0x04 | |
35 | #define PCF8563_REG_DM 0x05 | |
36 | #define PCF8563_REG_DW 0x06 | |
37 | #define PCF8563_REG_MO 0x07 | |
38 | #define PCF8563_REG_YR 0x08 | |
39 | ||
40 | #define PCF8563_REG_AMN 0x09 /* alarm */ | |
b5a82d62 AZ |
41 | |
42 | #define PCF8563_REG_CLKO 0x0D /* clock out */ | |
43 | #define PCF8563_REG_TMRC 0x0E /* timer control */ | |
44 | #define PCF8563_REG_TMR 0x0F /* timer */ | |
45 | ||
46 | #define PCF8563_SC_LV 0x80 /* low voltage */ | |
47 | #define PCF8563_MO_C 0x80 /* century */ | |
48 | ||
e5fc9cc0 AZ |
49 | static struct i2c_driver pcf8563_driver; |
50 | ||
cbb94502 | 51 | struct pcf8563 { |
e5fc9cc0 | 52 | struct rtc_device *rtc; |
cbb94502 AN |
53 | /* |
54 | * The meaning of MO_C bit varies by the chip type. | |
55 | * From PCF8563 datasheet: this bit is toggled when the years | |
56 | * register overflows from 99 to 00 | |
57 | * 0 indicates the century is 20xx | |
58 | * 1 indicates the century is 19xx | |
59 | * From RTC8564 datasheet: this bit indicates change of | |
60 | * century. When the year digit data overflows from 99 to 00, | |
61 | * this bit is set. By presetting it to 0 while still in the | |
62 | * 20th century, it will be set in year 2000, ... | |
63 | * There seems no reliable way to know how the system use this | |
64 | * bit. So let's do it heuristically, assuming we are live in | |
65 | * 1970...2069. | |
66 | */ | |
67 | int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */ | |
0f20b767 | 68 | int voltage_low; /* incicates if a low_voltage was detected */ |
ede3e9d4 VD |
69 | |
70 | struct i2c_client *client; | |
cbb94502 AN |
71 | }; |
72 | ||
2784366c VD |
73 | static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, |
74 | unsigned char length, unsigned char *buf) | |
b5a82d62 | 75 | { |
b5a82d62 | 76 | struct i2c_msg msgs[] = { |
755e4a4b S |
77 | {/* setup read ptr */ |
78 | .addr = client->addr, | |
79 | .len = 1, | |
2784366c | 80 | .buf = ®, |
755e4a4b | 81 | }, |
2784366c | 82 | { |
755e4a4b S |
83 | .addr = client->addr, |
84 | .flags = I2C_M_RD, | |
2784366c | 85 | .len = length, |
755e4a4b S |
86 | .buf = buf |
87 | }, | |
b5a82d62 AZ |
88 | }; |
89 | ||
b5a82d62 | 90 | if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { |
2a4e2b87 | 91 | dev_err(&client->dev, "%s: read error\n", __func__); |
b5a82d62 AZ |
92 | return -EIO; |
93 | } | |
94 | ||
2784366c VD |
95 | return 0; |
96 | } | |
97 | ||
98 | static int pcf8563_write_block_data(struct i2c_client *client, | |
99 | unsigned char reg, unsigned char length, | |
100 | unsigned char *buf) | |
101 | { | |
102 | int i, err; | |
103 | ||
104 | for (i = 0; i < length; i++) { | |
105 | unsigned char data[2] = { reg + i, buf[i] }; | |
106 | ||
107 | err = i2c_master_send(client, data, sizeof(data)); | |
108 | if (err != sizeof(data)) { | |
109 | dev_err(&client->dev, | |
110 | "%s: err=%d addr=%02x, data=%02x\n", | |
111 | __func__, err, data[0], data[1]); | |
112 | return -EIO; | |
113 | } | |
114 | } | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
ede3e9d4 VD |
119 | static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) |
120 | { | |
121 | unsigned char buf[2]; | |
122 | int err; | |
123 | ||
124 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, buf + 1); | |
125 | if (err < 0) | |
126 | return err; | |
127 | ||
128 | if (on) | |
129 | buf[1] |= PCF8563_BIT_AIE; | |
130 | else | |
131 | buf[1] &= ~PCF8563_BIT_AIE; | |
132 | ||
133 | buf[1] &= ~PCF8563_BIT_AF; | |
134 | buf[0] = PCF8563_REG_ST2; | |
135 | ||
136 | err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, buf + 1); | |
137 | if (err < 0) { | |
138 | dev_err(&client->dev, "%s: write error\n", __func__); | |
139 | return -EIO; | |
140 | } | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, | |
146 | unsigned char *pen) | |
147 | { | |
148 | unsigned char buf; | |
149 | int err; | |
150 | ||
151 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); | |
152 | if (err) | |
153 | return err; | |
154 | ||
155 | if (en) | |
156 | *en = !!(buf & PCF8563_BIT_AIE); | |
157 | if (pen) | |
158 | *pen = !!(buf & PCF8563_BIT_AF); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static irqreturn_t pcf8563_irq(int irq, void *dev_id) | |
164 | { | |
165 | struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); | |
166 | int err; | |
167 | char pending; | |
168 | ||
169 | err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); | |
e698a512 | 170 | if (err) |
ede3e9d4 VD |
171 | return err; |
172 | ||
173 | if (pending) { | |
174 | rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); | |
175 | pcf8563_set_alarm_mode(pcf8563->client, 1); | |
176 | return IRQ_HANDLED; | |
177 | } | |
178 | ||
179 | return IRQ_NONE; | |
180 | } | |
181 | ||
2784366c VD |
182 | /* |
183 | * In the routines that deal directly with the pcf8563 hardware, we use | |
184 | * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. | |
185 | */ | |
186 | static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) | |
187 | { | |
188 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); | |
189 | unsigned char buf[9]; | |
190 | int err; | |
191 | ||
192 | err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); | |
193 | if (err) | |
194 | return err; | |
195 | ||
0f20b767 AS |
196 | if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { |
197 | pcf8563->voltage_low = 1; | |
b5a82d62 AZ |
198 | dev_info(&client->dev, |
199 | "low voltage detected, date/time is not reliable.\n"); | |
0f20b767 | 200 | } |
b5a82d62 AZ |
201 | |
202 | dev_dbg(&client->dev, | |
203 | "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " | |
204 | "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", | |
2a4e2b87 | 205 | __func__, |
b5a82d62 AZ |
206 | buf[0], buf[1], buf[2], buf[3], |
207 | buf[4], buf[5], buf[6], buf[7], | |
208 | buf[8]); | |
209 | ||
210 | ||
fe20ba70 AB |
211 | tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); |
212 | tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); | |
213 | tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ | |
214 | tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); | |
b5a82d62 | 215 | tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; |
fe20ba70 AB |
216 | tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ |
217 | tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]); | |
cbb94502 AN |
218 | if (tm->tm_year < 70) |
219 | tm->tm_year += 100; /* assume we are in 1970...2069 */ | |
220 | /* detect the polarity heuristically. see note above. */ | |
221 | pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? | |
222 | (tm->tm_year >= 100) : (tm->tm_year < 100); | |
b5a82d62 AZ |
223 | |
224 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " | |
225 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
2a4e2b87 | 226 | __func__, |
b5a82d62 AZ |
227 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
228 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
229 | ||
230 | /* the clock can give out invalid datetime, but we cannot return | |
231 | * -EINVAL otherwise hwclock will refuse to set the time on bootup. | |
232 | */ | |
233 | if (rtc_valid_tm(tm) < 0) | |
234 | dev_err(&client->dev, "retrieved date/time is not valid.\n"); | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
240 | { | |
e5fc9cc0 | 241 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); |
2784366c | 242 | int err; |
b5a82d62 AZ |
243 | unsigned char buf[9]; |
244 | ||
245 | dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " | |
246 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
2a4e2b87 | 247 | __func__, |
b5a82d62 AZ |
248 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
249 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
250 | ||
251 | /* hours, minutes and seconds */ | |
fe20ba70 AB |
252 | buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); |
253 | buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); | |
254 | buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); | |
b5a82d62 | 255 | |
fe20ba70 | 256 | buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); |
b5a82d62 AZ |
257 | |
258 | /* month, 1 - 12 */ | |
fe20ba70 | 259 | buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); |
b5a82d62 AZ |
260 | |
261 | /* year and century */ | |
fe20ba70 | 262 | buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100); |
cbb94502 | 263 | if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) |
b5a82d62 AZ |
264 | buf[PCF8563_REG_MO] |= PCF8563_MO_C; |
265 | ||
266 | buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; | |
267 | ||
2784366c VD |
268 | err = pcf8563_write_block_data(client, PCF8563_REG_SC, |
269 | 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); | |
270 | if (err) | |
271 | return err; | |
b5a82d62 AZ |
272 | |
273 | return 0; | |
274 | } | |
275 | ||
0f20b767 AS |
276 | #ifdef CONFIG_RTC_INTF_DEV |
277 | static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
278 | { | |
279 | struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev)); | |
280 | struct rtc_time tm; | |
281 | ||
282 | switch (cmd) { | |
283 | case RTC_VL_READ: | |
284 | if (pcf8563->voltage_low) | |
285 | dev_info(dev, "low voltage detected, date/time is not reliable.\n"); | |
286 | ||
287 | if (copy_to_user((void __user *)arg, &pcf8563->voltage_low, | |
288 | sizeof(int))) | |
289 | return -EFAULT; | |
290 | return 0; | |
291 | case RTC_VL_CLR: | |
292 | /* | |
293 | * Clear the VL bit in the seconds register in case | |
294 | * the time has not been set already (which would | |
295 | * have cleared it). This does not really matter | |
296 | * because of the cached voltage_low value but do it | |
297 | * anyway for consistency. | |
298 | */ | |
299 | if (pcf8563_get_datetime(to_i2c_client(dev), &tm)) | |
300 | pcf8563_set_datetime(to_i2c_client(dev), &tm); | |
301 | ||
302 | /* Clear the cached value. */ | |
303 | pcf8563->voltage_low = 0; | |
304 | ||
305 | return 0; | |
306 | default: | |
307 | return -ENOIOCTLCMD; | |
308 | } | |
309 | } | |
310 | #else | |
311 | #define pcf8563_rtc_ioctl NULL | |
312 | #endif | |
313 | ||
b5a82d62 AZ |
314 | static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) |
315 | { | |
316 | return pcf8563_get_datetime(to_i2c_client(dev), tm); | |
317 | } | |
318 | ||
319 | static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
320 | { | |
321 | return pcf8563_set_datetime(to_i2c_client(dev), tm); | |
322 | } | |
323 | ||
ede3e9d4 VD |
324 | static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) |
325 | { | |
326 | struct i2c_client *client = to_i2c_client(dev); | |
327 | unsigned char buf[4]; | |
328 | int err; | |
329 | ||
330 | err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); | |
331 | if (err) | |
332 | return err; | |
333 | ||
334 | dev_dbg(&client->dev, | |
335 | "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", | |
336 | __func__, buf[0], buf[1], buf[2], buf[3]); | |
337 | ||
338 | tm->time.tm_min = bcd2bin(buf[0] & 0x7F); | |
339 | tm->time.tm_hour = bcd2bin(buf[1] & 0x7F); | |
340 | tm->time.tm_mday = bcd2bin(buf[2] & 0x1F); | |
341 | tm->time.tm_wday = bcd2bin(buf[3] & 0x7); | |
342 | tm->time.tm_mon = -1; | |
343 | tm->time.tm_year = -1; | |
344 | tm->time.tm_yday = -1; | |
345 | tm->time.tm_isdst = -1; | |
346 | ||
347 | err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending); | |
348 | if (err < 0) | |
349 | return err; | |
350 | ||
351 | dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d," | |
352 | " enabled=%d, pending=%d\n", __func__, tm->time.tm_min, | |
353 | tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, | |
354 | tm->enabled, tm->pending); | |
355 | ||
356 | return 0; | |
357 | } | |
358 | ||
359 | static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm) | |
360 | { | |
361 | struct i2c_client *client = to_i2c_client(dev); | |
362 | unsigned char buf[4]; | |
363 | int err; | |
364 | ||
365 | dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " | |
366 | "enabled=%d pending=%d\n", __func__, | |
367 | tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, | |
368 | tm->time.tm_mday, tm->enabled, tm->pending); | |
369 | ||
370 | buf[0] = bin2bcd(tm->time.tm_min); | |
371 | buf[1] = bin2bcd(tm->time.tm_hour); | |
372 | buf[2] = bin2bcd(tm->time.tm_mday); | |
373 | buf[3] = tm->time.tm_wday & 0x07; | |
374 | ||
375 | err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); | |
376 | if (err) | |
377 | return err; | |
378 | ||
379 | return pcf8563_set_alarm_mode(client, 1); | |
380 | } | |
381 | ||
382 | static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) | |
383 | { | |
384 | return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); | |
385 | } | |
386 | ||
ff8371ac | 387 | static const struct rtc_class_ops pcf8563_rtc_ops = { |
0f20b767 | 388 | .ioctl = pcf8563_rtc_ioctl, |
b5a82d62 AZ |
389 | .read_time = pcf8563_rtc_read_time, |
390 | .set_time = pcf8563_rtc_set_time, | |
ede3e9d4 VD |
391 | .read_alarm = pcf8563_rtc_read_alarm, |
392 | .set_alarm = pcf8563_rtc_set_alarm, | |
393 | .alarm_irq_enable = pcf8563_irq_enable, | |
b5a82d62 AZ |
394 | }; |
395 | ||
d2653e92 JD |
396 | static int pcf8563_probe(struct i2c_client *client, |
397 | const struct i2c_device_id *id) | |
b5a82d62 | 398 | { |
cbb94502 | 399 | struct pcf8563 *pcf8563; |
ede3e9d4 | 400 | int err; |
b5a82d62 | 401 | |
e5fc9cc0 | 402 | dev_dbg(&client->dev, "%s\n", __func__); |
b5a82d62 | 403 | |
e5fc9cc0 AZ |
404 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) |
405 | return -ENODEV; | |
b5a82d62 | 406 | |
d6fbdc34 JH |
407 | pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), |
408 | GFP_KERNEL); | |
e5fc9cc0 AZ |
409 | if (!pcf8563) |
410 | return -ENOMEM; | |
b5a82d62 | 411 | |
b5a82d62 AZ |
412 | dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n"); |
413 | ||
b74d2caa | 414 | i2c_set_clientdata(client, pcf8563); |
ede3e9d4 VD |
415 | pcf8563->client = client; |
416 | device_set_wakeup_capable(&client->dev, 1); | |
b74d2caa | 417 | |
d6fbdc34 JH |
418 | pcf8563->rtc = devm_rtc_device_register(&client->dev, |
419 | pcf8563_driver.driver.name, | |
420 | &pcf8563_rtc_ops, THIS_MODULE); | |
b5a82d62 | 421 | |
ede3e9d4 VD |
422 | if (IS_ERR(pcf8563->rtc)) |
423 | return PTR_ERR(pcf8563->rtc); | |
424 | ||
425 | if (client->irq > 0) { | |
426 | err = devm_request_threaded_irq(&client->dev, client->irq, | |
427 | NULL, pcf8563_irq, | |
428 | IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING, | |
429 | pcf8563->rtc->name, client); | |
430 | if (err) { | |
431 | dev_err(&client->dev, "unable to request IRQ %d\n", | |
432 | client->irq); | |
433 | return err; | |
434 | } | |
435 | ||
436 | } | |
437 | ||
438 | return 0; | |
b5a82d62 AZ |
439 | } |
440 | ||
3760f736 JD |
441 | static const struct i2c_device_id pcf8563_id[] = { |
442 | { "pcf8563", 0 }, | |
8ea9212c | 443 | { "rtc8564", 0 }, |
3760f736 JD |
444 | { } |
445 | }; | |
446 | MODULE_DEVICE_TABLE(i2c, pcf8563_id); | |
447 | ||
8dccaf06 | 448 | #ifdef CONFIG_OF |
5a167f45 | 449 | static const struct of_device_id pcf8563_of_match[] = { |
8dccaf06 NB |
450 | { .compatible = "nxp,pcf8563" }, |
451 | {} | |
452 | }; | |
453 | MODULE_DEVICE_TABLE(of, pcf8563_of_match); | |
454 | #endif | |
455 | ||
e5fc9cc0 AZ |
456 | static struct i2c_driver pcf8563_driver = { |
457 | .driver = { | |
458 | .name = "rtc-pcf8563", | |
0a25bf40 | 459 | .owner = THIS_MODULE, |
8dccaf06 | 460 | .of_match_table = of_match_ptr(pcf8563_of_match), |
e5fc9cc0 AZ |
461 | }, |
462 | .probe = pcf8563_probe, | |
3760f736 | 463 | .id_table = pcf8563_id, |
e5fc9cc0 AZ |
464 | }; |
465 | ||
0abc9201 | 466 | module_i2c_driver(pcf8563_driver); |
b5a82d62 AZ |
467 | |
468 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
469 | MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); | |
470 | MODULE_LICENSE("GPL"); | |
471 | MODULE_VERSION(DRV_VERSION); |