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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 | ||
a39a6405 | 17 | #include <linux/clk-provider.h> |
b5a82d62 AZ |
18 | #include <linux/i2c.h> |
19 | #include <linux/bcd.h> | |
20 | #include <linux/rtc.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
2113852b | 22 | #include <linux/module.h> |
8dccaf06 | 23 | #include <linux/of.h> |
23f809ee | 24 | #include <linux/err.h> |
b5a82d62 | 25 | |
b5a82d62 AZ |
26 | #define PCF8563_REG_ST1 0x00 /* status */ |
27 | #define PCF8563_REG_ST2 0x01 | |
ede3e9d4 VD |
28 | #define PCF8563_BIT_AIE (1 << 1) |
29 | #define PCF8563_BIT_AF (1 << 3) | |
45ef0458 | 30 | #define PCF8563_BITS_ST2_N (7 << 5) |
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 | 41 | |
a39a6405 HS |
42 | #define PCF8563_REG_CLKO 0x0D /* clock out */ |
43 | #define PCF8563_REG_CLKO_FE 0x80 /* clock out enabled */ | |
44 | #define PCF8563_REG_CLKO_F_MASK 0x03 /* frequenc mask */ | |
45 | #define PCF8563_REG_CLKO_F_32768HZ 0x00 | |
46 | #define PCF8563_REG_CLKO_F_1024HZ 0x01 | |
47 | #define PCF8563_REG_CLKO_F_32HZ 0x02 | |
48 | #define PCF8563_REG_CLKO_F_1HZ 0x03 | |
49 | ||
b5a82d62 | 50 | #define PCF8563_REG_TMRC 0x0E /* timer control */ |
ff0bc501 JK |
51 | #define PCF8563_TMRC_ENABLE BIT(7) |
52 | #define PCF8563_TMRC_4096 0 | |
53 | #define PCF8563_TMRC_64 1 | |
54 | #define PCF8563_TMRC_1 2 | |
55 | #define PCF8563_TMRC_1_60 3 | |
56 | #define PCF8563_TMRC_MASK 3 | |
57 | ||
b5a82d62 AZ |
58 | #define PCF8563_REG_TMR 0x0F /* timer */ |
59 | ||
60 | #define PCF8563_SC_LV 0x80 /* low voltage */ | |
61 | #define PCF8563_MO_C 0x80 /* century */ | |
62 | ||
e5fc9cc0 AZ |
63 | static struct i2c_driver pcf8563_driver; |
64 | ||
cbb94502 | 65 | struct pcf8563 { |
e5fc9cc0 | 66 | struct rtc_device *rtc; |
cbb94502 AN |
67 | /* |
68 | * The meaning of MO_C bit varies by the chip type. | |
69 | * From PCF8563 datasheet: this bit is toggled when the years | |
70 | * register overflows from 99 to 00 | |
71 | * 0 indicates the century is 20xx | |
72 | * 1 indicates the century is 19xx | |
73 | * From RTC8564 datasheet: this bit indicates change of | |
74 | * century. When the year digit data overflows from 99 to 00, | |
75 | * this bit is set. By presetting it to 0 while still in the | |
76 | * 20th century, it will be set in year 2000, ... | |
77 | * There seems no reliable way to know how the system use this | |
78 | * bit. So let's do it heuristically, assuming we are live in | |
79 | * 1970...2069. | |
80 | */ | |
81 | int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */ | |
0f20b767 | 82 | int voltage_low; /* incicates if a low_voltage was detected */ |
ede3e9d4 VD |
83 | |
84 | struct i2c_client *client; | |
a39a6405 HS |
85 | #ifdef CONFIG_COMMON_CLK |
86 | struct clk_hw clkout_hw; | |
87 | #endif | |
cbb94502 AN |
88 | }; |
89 | ||
2784366c VD |
90 | static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, |
91 | unsigned char length, unsigned char *buf) | |
b5a82d62 | 92 | { |
b5a82d62 | 93 | struct i2c_msg msgs[] = { |
755e4a4b S |
94 | {/* setup read ptr */ |
95 | .addr = client->addr, | |
96 | .len = 1, | |
2784366c | 97 | .buf = ®, |
755e4a4b | 98 | }, |
2784366c | 99 | { |
755e4a4b S |
100 | .addr = client->addr, |
101 | .flags = I2C_M_RD, | |
2784366c | 102 | .len = length, |
755e4a4b S |
103 | .buf = buf |
104 | }, | |
b5a82d62 AZ |
105 | }; |
106 | ||
b5a82d62 | 107 | if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { |
2a4e2b87 | 108 | dev_err(&client->dev, "%s: read error\n", __func__); |
b5a82d62 AZ |
109 | return -EIO; |
110 | } | |
111 | ||
2784366c VD |
112 | return 0; |
113 | } | |
114 | ||
115 | static int pcf8563_write_block_data(struct i2c_client *client, | |
116 | unsigned char reg, unsigned char length, | |
117 | unsigned char *buf) | |
118 | { | |
119 | int i, err; | |
120 | ||
121 | for (i = 0; i < length; i++) { | |
122 | unsigned char data[2] = { reg + i, buf[i] }; | |
123 | ||
124 | err = i2c_master_send(client, data, sizeof(data)); | |
125 | if (err != sizeof(data)) { | |
126 | dev_err(&client->dev, | |
127 | "%s: err=%d addr=%02x, data=%02x\n", | |
128 | __func__, err, data[0], data[1]); | |
129 | return -EIO; | |
130 | } | |
131 | } | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
ede3e9d4 VD |
136 | static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) |
137 | { | |
17a1e5e8 | 138 | unsigned char buf; |
ede3e9d4 VD |
139 | int err; |
140 | ||
17a1e5e8 | 141 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); |
ede3e9d4 VD |
142 | if (err < 0) |
143 | return err; | |
144 | ||
145 | if (on) | |
17a1e5e8 | 146 | buf |= PCF8563_BIT_AIE; |
ede3e9d4 | 147 | else |
17a1e5e8 | 148 | buf &= ~PCF8563_BIT_AIE; |
ede3e9d4 | 149 | |
45ef0458 | 150 | buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N); |
ede3e9d4 | 151 | |
17a1e5e8 | 152 | err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); |
ede3e9d4 VD |
153 | if (err < 0) { |
154 | dev_err(&client->dev, "%s: write error\n", __func__); | |
155 | return -EIO; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, | |
162 | unsigned char *pen) | |
163 | { | |
164 | unsigned char buf; | |
165 | int err; | |
166 | ||
167 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); | |
168 | if (err) | |
169 | return err; | |
170 | ||
171 | if (en) | |
172 | *en = !!(buf & PCF8563_BIT_AIE); | |
173 | if (pen) | |
174 | *pen = !!(buf & PCF8563_BIT_AF); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static irqreturn_t pcf8563_irq(int irq, void *dev_id) | |
180 | { | |
181 | struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); | |
182 | int err; | |
183 | char pending; | |
184 | ||
185 | err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); | |
e698a512 | 186 | if (err) |
3ff38237 | 187 | return IRQ_NONE; |
ede3e9d4 VD |
188 | |
189 | if (pending) { | |
190 | rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); | |
191 | pcf8563_set_alarm_mode(pcf8563->client, 1); | |
192 | return IRQ_HANDLED; | |
193 | } | |
194 | ||
195 | return IRQ_NONE; | |
196 | } | |
197 | ||
2784366c VD |
198 | /* |
199 | * In the routines that deal directly with the pcf8563 hardware, we use | |
200 | * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. | |
201 | */ | |
202 | static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) | |
203 | { | |
204 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); | |
205 | unsigned char buf[9]; | |
206 | int err; | |
207 | ||
208 | err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); | |
209 | if (err) | |
210 | return err; | |
211 | ||
0f20b767 AS |
212 | if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { |
213 | pcf8563->voltage_low = 1; | |
538330cc | 214 | dev_err(&client->dev, |
b5a82d62 | 215 | "low voltage detected, date/time is not reliable.\n"); |
538330cc | 216 | return -EINVAL; |
0f20b767 | 217 | } |
b5a82d62 AZ |
218 | |
219 | dev_dbg(&client->dev, | |
220 | "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " | |
221 | "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", | |
2a4e2b87 | 222 | __func__, |
b5a82d62 AZ |
223 | buf[0], buf[1], buf[2], buf[3], |
224 | buf[4], buf[5], buf[6], buf[7], | |
225 | buf[8]); | |
226 | ||
227 | ||
fe20ba70 AB |
228 | tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); |
229 | tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); | |
230 | tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ | |
231 | tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); | |
b5a82d62 | 232 | tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; |
fe20ba70 AB |
233 | tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ |
234 | tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]); | |
cbb94502 AN |
235 | if (tm->tm_year < 70) |
236 | tm->tm_year += 100; /* assume we are in 1970...2069 */ | |
237 | /* detect the polarity heuristically. see note above. */ | |
238 | pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? | |
239 | (tm->tm_year >= 100) : (tm->tm_year < 100); | |
b5a82d62 AZ |
240 | |
241 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " | |
242 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
2a4e2b87 | 243 | __func__, |
b5a82d62 AZ |
244 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
245 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
246 | ||
b5a82d62 AZ |
247 | return 0; |
248 | } | |
249 | ||
250 | static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
251 | { | |
e5fc9cc0 | 252 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); |
b5a82d62 AZ |
253 | unsigned char buf[9]; |
254 | ||
255 | dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " | |
256 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
2a4e2b87 | 257 | __func__, |
b5a82d62 AZ |
258 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
259 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
260 | ||
261 | /* hours, minutes and seconds */ | |
fe20ba70 AB |
262 | buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); |
263 | buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); | |
264 | buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); | |
b5a82d62 | 265 | |
fe20ba70 | 266 | buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); |
b5a82d62 AZ |
267 | |
268 | /* month, 1 - 12 */ | |
fe20ba70 | 269 | buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); |
b5a82d62 AZ |
270 | |
271 | /* year and century */ | |
fe20ba70 | 272 | buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100); |
cbb94502 | 273 | if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) |
b5a82d62 AZ |
274 | buf[PCF8563_REG_MO] |= PCF8563_MO_C; |
275 | ||
276 | buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; | |
277 | ||
b0c57b59 | 278 | return pcf8563_write_block_data(client, PCF8563_REG_SC, |
2784366c | 279 | 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); |
b5a82d62 AZ |
280 | } |
281 | ||
0f20b767 AS |
282 | #ifdef CONFIG_RTC_INTF_DEV |
283 | static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
284 | { | |
285 | struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev)); | |
286 | struct rtc_time tm; | |
287 | ||
288 | switch (cmd) { | |
289 | case RTC_VL_READ: | |
290 | if (pcf8563->voltage_low) | |
291 | dev_info(dev, "low voltage detected, date/time is not reliable.\n"); | |
292 | ||
293 | if (copy_to_user((void __user *)arg, &pcf8563->voltage_low, | |
294 | sizeof(int))) | |
295 | return -EFAULT; | |
296 | return 0; | |
297 | case RTC_VL_CLR: | |
298 | /* | |
299 | * Clear the VL bit in the seconds register in case | |
300 | * the time has not been set already (which would | |
301 | * have cleared it). This does not really matter | |
302 | * because of the cached voltage_low value but do it | |
303 | * anyway for consistency. | |
304 | */ | |
305 | if (pcf8563_get_datetime(to_i2c_client(dev), &tm)) | |
306 | pcf8563_set_datetime(to_i2c_client(dev), &tm); | |
307 | ||
308 | /* Clear the cached value. */ | |
309 | pcf8563->voltage_low = 0; | |
310 | ||
311 | return 0; | |
312 | default: | |
313 | return -ENOIOCTLCMD; | |
314 | } | |
315 | } | |
316 | #else | |
317 | #define pcf8563_rtc_ioctl NULL | |
318 | #endif | |
319 | ||
b5a82d62 AZ |
320 | static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) |
321 | { | |
322 | return pcf8563_get_datetime(to_i2c_client(dev), tm); | |
323 | } | |
324 | ||
325 | static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
326 | { | |
327 | return pcf8563_set_datetime(to_i2c_client(dev), tm); | |
328 | } | |
329 | ||
ede3e9d4 VD |
330 | static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) |
331 | { | |
332 | struct i2c_client *client = to_i2c_client(dev); | |
333 | unsigned char buf[4]; | |
334 | int err; | |
335 | ||
336 | err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); | |
337 | if (err) | |
338 | return err; | |
339 | ||
340 | dev_dbg(&client->dev, | |
341 | "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", | |
342 | __func__, buf[0], buf[1], buf[2], buf[3]); | |
343 | ||
d2c92705 | 344 | tm->time.tm_sec = 0; |
ede3e9d4 | 345 | tm->time.tm_min = bcd2bin(buf[0] & 0x7F); |
c7aef4f8 JK |
346 | tm->time.tm_hour = bcd2bin(buf[1] & 0x3F); |
347 | tm->time.tm_mday = bcd2bin(buf[2] & 0x3F); | |
ede3e9d4 | 348 | tm->time.tm_wday = bcd2bin(buf[3] & 0x7); |
ede3e9d4 VD |
349 | |
350 | err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending); | |
351 | if (err < 0) | |
352 | return err; | |
353 | ||
354 | dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d," | |
355 | " enabled=%d, pending=%d\n", __func__, tm->time.tm_min, | |
356 | tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, | |
357 | tm->enabled, tm->pending); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm) | |
363 | { | |
364 | struct i2c_client *client = to_i2c_client(dev); | |
365 | unsigned char buf[4]; | |
366 | int err; | |
599cda55 JK |
367 | |
368 | /* The alarm has no seconds, round up to nearest minute */ | |
369 | if (tm->time.tm_sec) { | |
626fea04 XP |
370 | time64_t alarm_time = rtc_tm_to_time64(&tm->time); |
371 | ||
372 | alarm_time += 60 - tm->time.tm_sec; | |
373 | rtc_time64_to_tm(alarm_time, &tm->time); | |
599cda55 | 374 | } |
ede3e9d4 VD |
375 | |
376 | dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " | |
377 | "enabled=%d pending=%d\n", __func__, | |
378 | tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, | |
379 | tm->time.tm_mday, tm->enabled, tm->pending); | |
380 | ||
381 | buf[0] = bin2bcd(tm->time.tm_min); | |
382 | buf[1] = bin2bcd(tm->time.tm_hour); | |
383 | buf[2] = bin2bcd(tm->time.tm_mday); | |
384 | buf[3] = tm->time.tm_wday & 0x07; | |
385 | ||
386 | err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); | |
387 | if (err) | |
388 | return err; | |
389 | ||
390 | return pcf8563_set_alarm_mode(client, 1); | |
391 | } | |
392 | ||
393 | static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) | |
394 | { | |
a45d528a | 395 | dev_dbg(dev, "%s: en=%d\n", __func__, enabled); |
ede3e9d4 VD |
396 | return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); |
397 | } | |
398 | ||
a39a6405 HS |
399 | #ifdef CONFIG_COMMON_CLK |
400 | /* | |
401 | * Handling of the clkout | |
402 | */ | |
403 | ||
404 | #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw) | |
405 | ||
406 | static int clkout_rates[] = { | |
407 | 32768, | |
408 | 1024, | |
409 | 32, | |
410 | 1, | |
411 | }; | |
412 | ||
413 | static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw, | |
414 | unsigned long parent_rate) | |
415 | { | |
416 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
417 | struct i2c_client *client = pcf8563->client; | |
418 | unsigned char buf; | |
419 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
420 | ||
421 | if (ret < 0) | |
422 | return 0; | |
423 | ||
424 | buf &= PCF8563_REG_CLKO_F_MASK; | |
425 | return clkout_rates[ret]; | |
426 | } | |
427 | ||
428 | static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate, | |
429 | unsigned long *prate) | |
430 | { | |
431 | int i; | |
432 | ||
433 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) | |
434 | if (clkout_rates[i] <= rate) | |
435 | return clkout_rates[i]; | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate, | |
441 | unsigned long parent_rate) | |
442 | { | |
443 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
444 | struct i2c_client *client = pcf8563->client; | |
445 | unsigned char buf; | |
446 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
447 | int i; | |
448 | ||
449 | if (ret < 0) | |
450 | return ret; | |
451 | ||
452 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) | |
453 | if (clkout_rates[i] == rate) { | |
454 | buf &= ~PCF8563_REG_CLKO_F_MASK; | |
455 | buf |= i; | |
456 | ret = pcf8563_write_block_data(client, | |
457 | PCF8563_REG_CLKO, 1, | |
458 | &buf); | |
459 | return ret; | |
460 | } | |
461 | ||
462 | return -EINVAL; | |
463 | } | |
464 | ||
465 | static int pcf8563_clkout_control(struct clk_hw *hw, bool enable) | |
466 | { | |
467 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
468 | struct i2c_client *client = pcf8563->client; | |
469 | unsigned char buf; | |
470 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
471 | ||
472 | if (ret < 0) | |
473 | return ret; | |
474 | ||
475 | if (enable) | |
476 | buf |= PCF8563_REG_CLKO_FE; | |
477 | else | |
478 | buf &= ~PCF8563_REG_CLKO_FE; | |
479 | ||
480 | ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
481 | return ret; | |
482 | } | |
483 | ||
484 | static int pcf8563_clkout_prepare(struct clk_hw *hw) | |
485 | { | |
486 | return pcf8563_clkout_control(hw, 1); | |
487 | } | |
488 | ||
489 | static void pcf8563_clkout_unprepare(struct clk_hw *hw) | |
490 | { | |
491 | pcf8563_clkout_control(hw, 0); | |
492 | } | |
493 | ||
494 | static int pcf8563_clkout_is_prepared(struct clk_hw *hw) | |
495 | { | |
496 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
497 | struct i2c_client *client = pcf8563->client; | |
498 | unsigned char buf; | |
499 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
500 | ||
501 | if (ret < 0) | |
502 | return ret; | |
503 | ||
504 | return !!(buf & PCF8563_REG_CLKO_FE); | |
505 | } | |
506 | ||
507 | static const struct clk_ops pcf8563_clkout_ops = { | |
508 | .prepare = pcf8563_clkout_prepare, | |
509 | .unprepare = pcf8563_clkout_unprepare, | |
510 | .is_prepared = pcf8563_clkout_is_prepared, | |
511 | .recalc_rate = pcf8563_clkout_recalc_rate, | |
512 | .round_rate = pcf8563_clkout_round_rate, | |
513 | .set_rate = pcf8563_clkout_set_rate, | |
514 | }; | |
515 | ||
516 | static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563) | |
517 | { | |
518 | struct i2c_client *client = pcf8563->client; | |
519 | struct device_node *node = client->dev.of_node; | |
520 | struct clk *clk; | |
521 | struct clk_init_data init; | |
522 | int ret; | |
523 | unsigned char buf; | |
524 | ||
525 | /* disable the clkout output */ | |
526 | buf = 0; | |
527 | ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
528 | if (ret < 0) | |
529 | return ERR_PTR(ret); | |
530 | ||
531 | init.name = "pcf8563-clkout"; | |
532 | init.ops = &pcf8563_clkout_ops; | |
74e1af32 | 533 | init.flags = 0; |
a39a6405 HS |
534 | init.parent_names = NULL; |
535 | init.num_parents = 0; | |
536 | pcf8563->clkout_hw.init = &init; | |
537 | ||
538 | /* optional override of the clockname */ | |
539 | of_property_read_string(node, "clock-output-names", &init.name); | |
540 | ||
541 | /* register the clock */ | |
542 | clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw); | |
543 | ||
544 | if (!IS_ERR(clk)) | |
545 | of_clk_add_provider(node, of_clk_src_simple_get, clk); | |
546 | ||
547 | return clk; | |
548 | } | |
549 | #endif | |
550 | ||
ff8371ac | 551 | static const struct rtc_class_ops pcf8563_rtc_ops = { |
0f20b767 | 552 | .ioctl = pcf8563_rtc_ioctl, |
b5a82d62 AZ |
553 | .read_time = pcf8563_rtc_read_time, |
554 | .set_time = pcf8563_rtc_set_time, | |
ede3e9d4 VD |
555 | .read_alarm = pcf8563_rtc_read_alarm, |
556 | .set_alarm = pcf8563_rtc_set_alarm, | |
557 | .alarm_irq_enable = pcf8563_irq_enable, | |
b5a82d62 AZ |
558 | }; |
559 | ||
d2653e92 JD |
560 | static int pcf8563_probe(struct i2c_client *client, |
561 | const struct i2c_device_id *id) | |
b5a82d62 | 562 | { |
cbb94502 | 563 | struct pcf8563 *pcf8563; |
ede3e9d4 | 564 | int err; |
ff0bc501 | 565 | unsigned char buf; |
a45d528a | 566 | unsigned char alm_pending; |
b5a82d62 | 567 | |
e5fc9cc0 | 568 | dev_dbg(&client->dev, "%s\n", __func__); |
b5a82d62 | 569 | |
e5fc9cc0 AZ |
570 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) |
571 | return -ENODEV; | |
b5a82d62 | 572 | |
d6fbdc34 JH |
573 | pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), |
574 | GFP_KERNEL); | |
e5fc9cc0 AZ |
575 | if (!pcf8563) |
576 | return -ENOMEM; | |
b5a82d62 | 577 | |
b74d2caa | 578 | i2c_set_clientdata(client, pcf8563); |
ede3e9d4 VD |
579 | pcf8563->client = client; |
580 | device_set_wakeup_capable(&client->dev, 1); | |
b74d2caa | 581 | |
ff0bc501 JK |
582 | /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */ |
583 | buf = PCF8563_TMRC_1_60; | |
584 | err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf); | |
585 | if (err < 0) { | |
586 | dev_err(&client->dev, "%s: write error\n", __func__); | |
587 | return err; | |
588 | } | |
589 | ||
a45d528a | 590 | err = pcf8563_get_alarm_mode(client, NULL, &alm_pending); |
cd1420d3 | 591 | if (err) { |
a45d528a JK |
592 | dev_err(&client->dev, "%s: read error\n", __func__); |
593 | return err; | |
594 | } | |
595 | if (alm_pending) | |
596 | pcf8563_set_alarm_mode(client, 0); | |
597 | ||
d6fbdc34 JH |
598 | pcf8563->rtc = devm_rtc_device_register(&client->dev, |
599 | pcf8563_driver.driver.name, | |
600 | &pcf8563_rtc_ops, THIS_MODULE); | |
b5a82d62 | 601 | |
ede3e9d4 VD |
602 | if (IS_ERR(pcf8563->rtc)) |
603 | return PTR_ERR(pcf8563->rtc); | |
604 | ||
605 | if (client->irq > 0) { | |
606 | err = devm_request_threaded_irq(&client->dev, client->irq, | |
607 | NULL, pcf8563_irq, | |
608 | IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING, | |
f09e7069 | 609 | pcf8563_driver.driver.name, client); |
ede3e9d4 VD |
610 | if (err) { |
611 | dev_err(&client->dev, "unable to request IRQ %d\n", | |
612 | client->irq); | |
613 | return err; | |
614 | } | |
615 | ||
616 | } | |
617 | ||
a39a6405 HS |
618 | #ifdef CONFIG_COMMON_CLK |
619 | /* register clk in common clk framework */ | |
620 | pcf8563_clkout_register_clk(pcf8563); | |
621 | #endif | |
622 | ||
599cda55 JK |
623 | /* the pcf8563 alarm only supports a minute accuracy */ |
624 | pcf8563->rtc->uie_unsupported = 1; | |
625 | ||
ede3e9d4 | 626 | return 0; |
b5a82d62 AZ |
627 | } |
628 | ||
3760f736 JD |
629 | static const struct i2c_device_id pcf8563_id[] = { |
630 | { "pcf8563", 0 }, | |
8ea9212c | 631 | { "rtc8564", 0 }, |
3760f736 JD |
632 | { } |
633 | }; | |
634 | MODULE_DEVICE_TABLE(i2c, pcf8563_id); | |
635 | ||
8dccaf06 | 636 | #ifdef CONFIG_OF |
5a167f45 | 637 | static const struct of_device_id pcf8563_of_match[] = { |
8dccaf06 NB |
638 | { .compatible = "nxp,pcf8563" }, |
639 | {} | |
640 | }; | |
641 | MODULE_DEVICE_TABLE(of, pcf8563_of_match); | |
642 | #endif | |
643 | ||
e5fc9cc0 AZ |
644 | static struct i2c_driver pcf8563_driver = { |
645 | .driver = { | |
646 | .name = "rtc-pcf8563", | |
8dccaf06 | 647 | .of_match_table = of_match_ptr(pcf8563_of_match), |
e5fc9cc0 AZ |
648 | }, |
649 | .probe = pcf8563_probe, | |
3760f736 | 650 | .id_table = pcf8563_id, |
e5fc9cc0 AZ |
651 | }; |
652 | ||
0abc9201 | 653 | module_i2c_driver(pcf8563_driver); |
b5a82d62 AZ |
654 | |
655 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
656 | MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); | |
657 | MODULE_LICENSE("GPL"); |