Commit | Line | Data |
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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 | |
538330cc | 26 | #define DRV_VERSION "0.4.4" |
b5a82d62 AZ |
27 | |
28 | #define PCF8563_REG_ST1 0x00 /* status */ | |
29 | #define PCF8563_REG_ST2 0x01 | |
ede3e9d4 VD |
30 | #define PCF8563_BIT_AIE (1 << 1) |
31 | #define PCF8563_BIT_AF (1 << 3) | |
45ef0458 | 32 | #define PCF8563_BITS_ST2_N (7 << 5) |
b5a82d62 AZ |
33 | |
34 | #define PCF8563_REG_SC 0x02 /* datetime */ | |
35 | #define PCF8563_REG_MN 0x03 | |
36 | #define PCF8563_REG_HR 0x04 | |
37 | #define PCF8563_REG_DM 0x05 | |
38 | #define PCF8563_REG_DW 0x06 | |
39 | #define PCF8563_REG_MO 0x07 | |
40 | #define PCF8563_REG_YR 0x08 | |
41 | ||
42 | #define PCF8563_REG_AMN 0x09 /* alarm */ | |
b5a82d62 | 43 | |
a39a6405 HS |
44 | #define PCF8563_REG_CLKO 0x0D /* clock out */ |
45 | #define PCF8563_REG_CLKO_FE 0x80 /* clock out enabled */ | |
46 | #define PCF8563_REG_CLKO_F_MASK 0x03 /* frequenc mask */ | |
47 | #define PCF8563_REG_CLKO_F_32768HZ 0x00 | |
48 | #define PCF8563_REG_CLKO_F_1024HZ 0x01 | |
49 | #define PCF8563_REG_CLKO_F_32HZ 0x02 | |
50 | #define PCF8563_REG_CLKO_F_1HZ 0x03 | |
51 | ||
b5a82d62 | 52 | #define PCF8563_REG_TMRC 0x0E /* timer control */ |
ff0bc501 JK |
53 | #define PCF8563_TMRC_ENABLE BIT(7) |
54 | #define PCF8563_TMRC_4096 0 | |
55 | #define PCF8563_TMRC_64 1 | |
56 | #define PCF8563_TMRC_1 2 | |
57 | #define PCF8563_TMRC_1_60 3 | |
58 | #define PCF8563_TMRC_MASK 3 | |
59 | ||
b5a82d62 AZ |
60 | #define PCF8563_REG_TMR 0x0F /* timer */ |
61 | ||
62 | #define PCF8563_SC_LV 0x80 /* low voltage */ | |
63 | #define PCF8563_MO_C 0x80 /* century */ | |
64 | ||
e5fc9cc0 AZ |
65 | static struct i2c_driver pcf8563_driver; |
66 | ||
cbb94502 | 67 | struct pcf8563 { |
e5fc9cc0 | 68 | struct rtc_device *rtc; |
cbb94502 AN |
69 | /* |
70 | * The meaning of MO_C bit varies by the chip type. | |
71 | * From PCF8563 datasheet: this bit is toggled when the years | |
72 | * register overflows from 99 to 00 | |
73 | * 0 indicates the century is 20xx | |
74 | * 1 indicates the century is 19xx | |
75 | * From RTC8564 datasheet: this bit indicates change of | |
76 | * century. When the year digit data overflows from 99 to 00, | |
77 | * this bit is set. By presetting it to 0 while still in the | |
78 | * 20th century, it will be set in year 2000, ... | |
79 | * There seems no reliable way to know how the system use this | |
80 | * bit. So let's do it heuristically, assuming we are live in | |
81 | * 1970...2069. | |
82 | */ | |
83 | int c_polarity; /* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */ | |
0f20b767 | 84 | int voltage_low; /* incicates if a low_voltage was detected */ |
ede3e9d4 VD |
85 | |
86 | struct i2c_client *client; | |
a39a6405 HS |
87 | #ifdef CONFIG_COMMON_CLK |
88 | struct clk_hw clkout_hw; | |
89 | #endif | |
cbb94502 AN |
90 | }; |
91 | ||
2784366c VD |
92 | static int pcf8563_read_block_data(struct i2c_client *client, unsigned char reg, |
93 | unsigned char length, unsigned char *buf) | |
b5a82d62 | 94 | { |
b5a82d62 | 95 | struct i2c_msg msgs[] = { |
755e4a4b S |
96 | {/* setup read ptr */ |
97 | .addr = client->addr, | |
98 | .len = 1, | |
2784366c | 99 | .buf = ®, |
755e4a4b | 100 | }, |
2784366c | 101 | { |
755e4a4b S |
102 | .addr = client->addr, |
103 | .flags = I2C_M_RD, | |
2784366c | 104 | .len = length, |
755e4a4b S |
105 | .buf = buf |
106 | }, | |
b5a82d62 AZ |
107 | }; |
108 | ||
b5a82d62 | 109 | if ((i2c_transfer(client->adapter, msgs, 2)) != 2) { |
2a4e2b87 | 110 | dev_err(&client->dev, "%s: read error\n", __func__); |
b5a82d62 AZ |
111 | return -EIO; |
112 | } | |
113 | ||
2784366c VD |
114 | return 0; |
115 | } | |
116 | ||
117 | static int pcf8563_write_block_data(struct i2c_client *client, | |
118 | unsigned char reg, unsigned char length, | |
119 | unsigned char *buf) | |
120 | { | |
121 | int i, err; | |
122 | ||
123 | for (i = 0; i < length; i++) { | |
124 | unsigned char data[2] = { reg + i, buf[i] }; | |
125 | ||
126 | err = i2c_master_send(client, data, sizeof(data)); | |
127 | if (err != sizeof(data)) { | |
128 | dev_err(&client->dev, | |
129 | "%s: err=%d addr=%02x, data=%02x\n", | |
130 | __func__, err, data[0], data[1]); | |
131 | return -EIO; | |
132 | } | |
133 | } | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
ede3e9d4 VD |
138 | static int pcf8563_set_alarm_mode(struct i2c_client *client, bool on) |
139 | { | |
17a1e5e8 | 140 | unsigned char buf; |
ede3e9d4 VD |
141 | int err; |
142 | ||
17a1e5e8 | 143 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); |
ede3e9d4 VD |
144 | if (err < 0) |
145 | return err; | |
146 | ||
147 | if (on) | |
17a1e5e8 | 148 | buf |= PCF8563_BIT_AIE; |
ede3e9d4 | 149 | else |
17a1e5e8 | 150 | buf &= ~PCF8563_BIT_AIE; |
ede3e9d4 | 151 | |
45ef0458 | 152 | buf &= ~(PCF8563_BIT_AF | PCF8563_BITS_ST2_N); |
ede3e9d4 | 153 | |
17a1e5e8 | 154 | err = pcf8563_write_block_data(client, PCF8563_REG_ST2, 1, &buf); |
ede3e9d4 VD |
155 | if (err < 0) { |
156 | dev_err(&client->dev, "%s: write error\n", __func__); | |
157 | return -EIO; | |
158 | } | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int pcf8563_get_alarm_mode(struct i2c_client *client, unsigned char *en, | |
164 | unsigned char *pen) | |
165 | { | |
166 | unsigned char buf; | |
167 | int err; | |
168 | ||
169 | err = pcf8563_read_block_data(client, PCF8563_REG_ST2, 1, &buf); | |
170 | if (err) | |
171 | return err; | |
172 | ||
173 | if (en) | |
174 | *en = !!(buf & PCF8563_BIT_AIE); | |
175 | if (pen) | |
176 | *pen = !!(buf & PCF8563_BIT_AF); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static irqreturn_t pcf8563_irq(int irq, void *dev_id) | |
182 | { | |
183 | struct pcf8563 *pcf8563 = i2c_get_clientdata(dev_id); | |
184 | int err; | |
185 | char pending; | |
186 | ||
187 | err = pcf8563_get_alarm_mode(pcf8563->client, NULL, &pending); | |
e698a512 | 188 | if (err) |
3ff38237 | 189 | return IRQ_NONE; |
ede3e9d4 VD |
190 | |
191 | if (pending) { | |
192 | rtc_update_irq(pcf8563->rtc, 1, RTC_IRQF | RTC_AF); | |
193 | pcf8563_set_alarm_mode(pcf8563->client, 1); | |
194 | return IRQ_HANDLED; | |
195 | } | |
196 | ||
197 | return IRQ_NONE; | |
198 | } | |
199 | ||
2784366c VD |
200 | /* |
201 | * In the routines that deal directly with the pcf8563 hardware, we use | |
202 | * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch. | |
203 | */ | |
204 | static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) | |
205 | { | |
206 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); | |
207 | unsigned char buf[9]; | |
208 | int err; | |
209 | ||
210 | err = pcf8563_read_block_data(client, PCF8563_REG_ST1, 9, buf); | |
211 | if (err) | |
212 | return err; | |
213 | ||
0f20b767 AS |
214 | if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) { |
215 | pcf8563->voltage_low = 1; | |
538330cc | 216 | dev_err(&client->dev, |
b5a82d62 | 217 | "low voltage detected, date/time is not reliable.\n"); |
538330cc | 218 | return -EINVAL; |
0f20b767 | 219 | } |
b5a82d62 AZ |
220 | |
221 | dev_dbg(&client->dev, | |
222 | "%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, " | |
223 | "mday=%02x, wday=%02x, mon=%02x, year=%02x\n", | |
2a4e2b87 | 224 | __func__, |
b5a82d62 AZ |
225 | buf[0], buf[1], buf[2], buf[3], |
226 | buf[4], buf[5], buf[6], buf[7], | |
227 | buf[8]); | |
228 | ||
229 | ||
fe20ba70 AB |
230 | tm->tm_sec = bcd2bin(buf[PCF8563_REG_SC] & 0x7F); |
231 | tm->tm_min = bcd2bin(buf[PCF8563_REG_MN] & 0x7F); | |
232 | tm->tm_hour = bcd2bin(buf[PCF8563_REG_HR] & 0x3F); /* rtc hr 0-23 */ | |
233 | tm->tm_mday = bcd2bin(buf[PCF8563_REG_DM] & 0x3F); | |
b5a82d62 | 234 | tm->tm_wday = buf[PCF8563_REG_DW] & 0x07; |
fe20ba70 AB |
235 | tm->tm_mon = bcd2bin(buf[PCF8563_REG_MO] & 0x1F) - 1; /* rtc mn 1-12 */ |
236 | tm->tm_year = bcd2bin(buf[PCF8563_REG_YR]); | |
cbb94502 AN |
237 | if (tm->tm_year < 70) |
238 | tm->tm_year += 100; /* assume we are in 1970...2069 */ | |
239 | /* detect the polarity heuristically. see note above. */ | |
240 | pcf8563->c_polarity = (buf[PCF8563_REG_MO] & PCF8563_MO_C) ? | |
241 | (tm->tm_year >= 100) : (tm->tm_year < 100); | |
b5a82d62 AZ |
242 | |
243 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " | |
244 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
2a4e2b87 | 245 | __func__, |
b5a82d62 AZ |
246 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
247 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
248 | ||
b5a82d62 AZ |
249 | return 0; |
250 | } | |
251 | ||
252 | static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
253 | { | |
e5fc9cc0 | 254 | struct pcf8563 *pcf8563 = i2c_get_clientdata(client); |
b5a82d62 AZ |
255 | unsigned char buf[9]; |
256 | ||
257 | dev_dbg(&client->dev, "%s: secs=%d, mins=%d, hours=%d, " | |
258 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
2a4e2b87 | 259 | __func__, |
b5a82d62 AZ |
260 | tm->tm_sec, tm->tm_min, tm->tm_hour, |
261 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
262 | ||
263 | /* hours, minutes and seconds */ | |
fe20ba70 AB |
264 | buf[PCF8563_REG_SC] = bin2bcd(tm->tm_sec); |
265 | buf[PCF8563_REG_MN] = bin2bcd(tm->tm_min); | |
266 | buf[PCF8563_REG_HR] = bin2bcd(tm->tm_hour); | |
b5a82d62 | 267 | |
fe20ba70 | 268 | buf[PCF8563_REG_DM] = bin2bcd(tm->tm_mday); |
b5a82d62 AZ |
269 | |
270 | /* month, 1 - 12 */ | |
fe20ba70 | 271 | buf[PCF8563_REG_MO] = bin2bcd(tm->tm_mon + 1); |
b5a82d62 AZ |
272 | |
273 | /* year and century */ | |
fe20ba70 | 274 | buf[PCF8563_REG_YR] = bin2bcd(tm->tm_year % 100); |
cbb94502 | 275 | if (pcf8563->c_polarity ? (tm->tm_year >= 100) : (tm->tm_year < 100)) |
b5a82d62 AZ |
276 | buf[PCF8563_REG_MO] |= PCF8563_MO_C; |
277 | ||
278 | buf[PCF8563_REG_DW] = tm->tm_wday & 0x07; | |
279 | ||
b0c57b59 | 280 | return pcf8563_write_block_data(client, PCF8563_REG_SC, |
2784366c | 281 | 9 - PCF8563_REG_SC, buf + PCF8563_REG_SC); |
b5a82d62 AZ |
282 | } |
283 | ||
0f20b767 AS |
284 | #ifdef CONFIG_RTC_INTF_DEV |
285 | static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
286 | { | |
287 | struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev)); | |
288 | struct rtc_time tm; | |
289 | ||
290 | switch (cmd) { | |
291 | case RTC_VL_READ: | |
292 | if (pcf8563->voltage_low) | |
293 | dev_info(dev, "low voltage detected, date/time is not reliable.\n"); | |
294 | ||
295 | if (copy_to_user((void __user *)arg, &pcf8563->voltage_low, | |
296 | sizeof(int))) | |
297 | return -EFAULT; | |
298 | return 0; | |
299 | case RTC_VL_CLR: | |
300 | /* | |
301 | * Clear the VL bit in the seconds register in case | |
302 | * the time has not been set already (which would | |
303 | * have cleared it). This does not really matter | |
304 | * because of the cached voltage_low value but do it | |
305 | * anyway for consistency. | |
306 | */ | |
307 | if (pcf8563_get_datetime(to_i2c_client(dev), &tm)) | |
308 | pcf8563_set_datetime(to_i2c_client(dev), &tm); | |
309 | ||
310 | /* Clear the cached value. */ | |
311 | pcf8563->voltage_low = 0; | |
312 | ||
313 | return 0; | |
314 | default: | |
315 | return -ENOIOCTLCMD; | |
316 | } | |
317 | } | |
318 | #else | |
319 | #define pcf8563_rtc_ioctl NULL | |
320 | #endif | |
321 | ||
b5a82d62 AZ |
322 | static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm) |
323 | { | |
324 | return pcf8563_get_datetime(to_i2c_client(dev), tm); | |
325 | } | |
326 | ||
327 | static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
328 | { | |
329 | return pcf8563_set_datetime(to_i2c_client(dev), tm); | |
330 | } | |
331 | ||
ede3e9d4 VD |
332 | static int pcf8563_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *tm) |
333 | { | |
334 | struct i2c_client *client = to_i2c_client(dev); | |
335 | unsigned char buf[4]; | |
336 | int err; | |
337 | ||
338 | err = pcf8563_read_block_data(client, PCF8563_REG_AMN, 4, buf); | |
339 | if (err) | |
340 | return err; | |
341 | ||
342 | dev_dbg(&client->dev, | |
343 | "%s: raw data is min=%02x, hr=%02x, mday=%02x, wday=%02x\n", | |
344 | __func__, buf[0], buf[1], buf[2], buf[3]); | |
345 | ||
346 | tm->time.tm_min = bcd2bin(buf[0] & 0x7F); | |
c7aef4f8 JK |
347 | tm->time.tm_hour = bcd2bin(buf[1] & 0x3F); |
348 | tm->time.tm_mday = bcd2bin(buf[2] & 0x3F); | |
ede3e9d4 VD |
349 | tm->time.tm_wday = bcd2bin(buf[3] & 0x7); |
350 | tm->time.tm_mon = -1; | |
351 | tm->time.tm_year = -1; | |
352 | tm->time.tm_yday = -1; | |
353 | tm->time.tm_isdst = -1; | |
354 | ||
355 | err = pcf8563_get_alarm_mode(client, &tm->enabled, &tm->pending); | |
356 | if (err < 0) | |
357 | return err; | |
358 | ||
359 | dev_dbg(&client->dev, "%s: tm is mins=%d, hours=%d, mday=%d, wday=%d," | |
360 | " enabled=%d, pending=%d\n", __func__, tm->time.tm_min, | |
361 | tm->time.tm_hour, tm->time.tm_mday, tm->time.tm_wday, | |
362 | tm->enabled, tm->pending); | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm) | |
368 | { | |
369 | struct i2c_client *client = to_i2c_client(dev); | |
370 | unsigned char buf[4]; | |
371 | int err; | |
599cda55 JK |
372 | |
373 | /* The alarm has no seconds, round up to nearest minute */ | |
374 | if (tm->time.tm_sec) { | |
626fea04 XP |
375 | time64_t alarm_time = rtc_tm_to_time64(&tm->time); |
376 | ||
377 | alarm_time += 60 - tm->time.tm_sec; | |
378 | rtc_time64_to_tm(alarm_time, &tm->time); | |
599cda55 | 379 | } |
ede3e9d4 VD |
380 | |
381 | dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d " | |
382 | "enabled=%d pending=%d\n", __func__, | |
383 | tm->time.tm_min, tm->time.tm_hour, tm->time.tm_wday, | |
384 | tm->time.tm_mday, tm->enabled, tm->pending); | |
385 | ||
386 | buf[0] = bin2bcd(tm->time.tm_min); | |
387 | buf[1] = bin2bcd(tm->time.tm_hour); | |
388 | buf[2] = bin2bcd(tm->time.tm_mday); | |
389 | buf[3] = tm->time.tm_wday & 0x07; | |
390 | ||
391 | err = pcf8563_write_block_data(client, PCF8563_REG_AMN, 4, buf); | |
392 | if (err) | |
393 | return err; | |
394 | ||
395 | return pcf8563_set_alarm_mode(client, 1); | |
396 | } | |
397 | ||
398 | static int pcf8563_irq_enable(struct device *dev, unsigned int enabled) | |
399 | { | |
a45d528a | 400 | dev_dbg(dev, "%s: en=%d\n", __func__, enabled); |
ede3e9d4 VD |
401 | return pcf8563_set_alarm_mode(to_i2c_client(dev), !!enabled); |
402 | } | |
403 | ||
a39a6405 HS |
404 | #ifdef CONFIG_COMMON_CLK |
405 | /* | |
406 | * Handling of the clkout | |
407 | */ | |
408 | ||
409 | #define clkout_hw_to_pcf8563(_hw) container_of(_hw, struct pcf8563, clkout_hw) | |
410 | ||
411 | static int clkout_rates[] = { | |
412 | 32768, | |
413 | 1024, | |
414 | 32, | |
415 | 1, | |
416 | }; | |
417 | ||
418 | static unsigned long pcf8563_clkout_recalc_rate(struct clk_hw *hw, | |
419 | unsigned long parent_rate) | |
420 | { | |
421 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
422 | struct i2c_client *client = pcf8563->client; | |
423 | unsigned char buf; | |
424 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
425 | ||
426 | if (ret < 0) | |
427 | return 0; | |
428 | ||
429 | buf &= PCF8563_REG_CLKO_F_MASK; | |
430 | return clkout_rates[ret]; | |
431 | } | |
432 | ||
433 | static long pcf8563_clkout_round_rate(struct clk_hw *hw, unsigned long rate, | |
434 | unsigned long *prate) | |
435 | { | |
436 | int i; | |
437 | ||
438 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) | |
439 | if (clkout_rates[i] <= rate) | |
440 | return clkout_rates[i]; | |
441 | ||
442 | return 0; | |
443 | } | |
444 | ||
445 | static int pcf8563_clkout_set_rate(struct clk_hw *hw, unsigned long rate, | |
446 | unsigned long parent_rate) | |
447 | { | |
448 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
449 | struct i2c_client *client = pcf8563->client; | |
450 | unsigned char buf; | |
451 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
452 | int i; | |
453 | ||
454 | if (ret < 0) | |
455 | return ret; | |
456 | ||
457 | for (i = 0; i < ARRAY_SIZE(clkout_rates); i++) | |
458 | if (clkout_rates[i] == rate) { | |
459 | buf &= ~PCF8563_REG_CLKO_F_MASK; | |
460 | buf |= i; | |
461 | ret = pcf8563_write_block_data(client, | |
462 | PCF8563_REG_CLKO, 1, | |
463 | &buf); | |
464 | return ret; | |
465 | } | |
466 | ||
467 | return -EINVAL; | |
468 | } | |
469 | ||
470 | static int pcf8563_clkout_control(struct clk_hw *hw, bool enable) | |
471 | { | |
472 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
473 | struct i2c_client *client = pcf8563->client; | |
474 | unsigned char buf; | |
475 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
476 | ||
477 | if (ret < 0) | |
478 | return ret; | |
479 | ||
480 | if (enable) | |
481 | buf |= PCF8563_REG_CLKO_FE; | |
482 | else | |
483 | buf &= ~PCF8563_REG_CLKO_FE; | |
484 | ||
485 | ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
486 | return ret; | |
487 | } | |
488 | ||
489 | static int pcf8563_clkout_prepare(struct clk_hw *hw) | |
490 | { | |
491 | return pcf8563_clkout_control(hw, 1); | |
492 | } | |
493 | ||
494 | static void pcf8563_clkout_unprepare(struct clk_hw *hw) | |
495 | { | |
496 | pcf8563_clkout_control(hw, 0); | |
497 | } | |
498 | ||
499 | static int pcf8563_clkout_is_prepared(struct clk_hw *hw) | |
500 | { | |
501 | struct pcf8563 *pcf8563 = clkout_hw_to_pcf8563(hw); | |
502 | struct i2c_client *client = pcf8563->client; | |
503 | unsigned char buf; | |
504 | int ret = pcf8563_read_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
505 | ||
506 | if (ret < 0) | |
507 | return ret; | |
508 | ||
509 | return !!(buf & PCF8563_REG_CLKO_FE); | |
510 | } | |
511 | ||
512 | static const struct clk_ops pcf8563_clkout_ops = { | |
513 | .prepare = pcf8563_clkout_prepare, | |
514 | .unprepare = pcf8563_clkout_unprepare, | |
515 | .is_prepared = pcf8563_clkout_is_prepared, | |
516 | .recalc_rate = pcf8563_clkout_recalc_rate, | |
517 | .round_rate = pcf8563_clkout_round_rate, | |
518 | .set_rate = pcf8563_clkout_set_rate, | |
519 | }; | |
520 | ||
521 | static struct clk *pcf8563_clkout_register_clk(struct pcf8563 *pcf8563) | |
522 | { | |
523 | struct i2c_client *client = pcf8563->client; | |
524 | struct device_node *node = client->dev.of_node; | |
525 | struct clk *clk; | |
526 | struct clk_init_data init; | |
527 | int ret; | |
528 | unsigned char buf; | |
529 | ||
530 | /* disable the clkout output */ | |
531 | buf = 0; | |
532 | ret = pcf8563_write_block_data(client, PCF8563_REG_CLKO, 1, &buf); | |
533 | if (ret < 0) | |
534 | return ERR_PTR(ret); | |
535 | ||
536 | init.name = "pcf8563-clkout"; | |
537 | init.ops = &pcf8563_clkout_ops; | |
538 | init.flags = CLK_IS_ROOT; | |
539 | init.parent_names = NULL; | |
540 | init.num_parents = 0; | |
541 | pcf8563->clkout_hw.init = &init; | |
542 | ||
543 | /* optional override of the clockname */ | |
544 | of_property_read_string(node, "clock-output-names", &init.name); | |
545 | ||
546 | /* register the clock */ | |
547 | clk = devm_clk_register(&client->dev, &pcf8563->clkout_hw); | |
548 | ||
549 | if (!IS_ERR(clk)) | |
550 | of_clk_add_provider(node, of_clk_src_simple_get, clk); | |
551 | ||
552 | return clk; | |
553 | } | |
554 | #endif | |
555 | ||
ff8371ac | 556 | static const struct rtc_class_ops pcf8563_rtc_ops = { |
0f20b767 | 557 | .ioctl = pcf8563_rtc_ioctl, |
b5a82d62 AZ |
558 | .read_time = pcf8563_rtc_read_time, |
559 | .set_time = pcf8563_rtc_set_time, | |
ede3e9d4 VD |
560 | .read_alarm = pcf8563_rtc_read_alarm, |
561 | .set_alarm = pcf8563_rtc_set_alarm, | |
562 | .alarm_irq_enable = pcf8563_irq_enable, | |
b5a82d62 AZ |
563 | }; |
564 | ||
d2653e92 JD |
565 | static int pcf8563_probe(struct i2c_client *client, |
566 | const struct i2c_device_id *id) | |
b5a82d62 | 567 | { |
cbb94502 | 568 | struct pcf8563 *pcf8563; |
ede3e9d4 | 569 | int err; |
ff0bc501 | 570 | unsigned char buf; |
a45d528a | 571 | unsigned char alm_pending; |
b5a82d62 | 572 | |
e5fc9cc0 | 573 | dev_dbg(&client->dev, "%s\n", __func__); |
b5a82d62 | 574 | |
e5fc9cc0 AZ |
575 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) |
576 | return -ENODEV; | |
b5a82d62 | 577 | |
d6fbdc34 JH |
578 | pcf8563 = devm_kzalloc(&client->dev, sizeof(struct pcf8563), |
579 | GFP_KERNEL); | |
e5fc9cc0 AZ |
580 | if (!pcf8563) |
581 | return -ENOMEM; | |
b5a82d62 | 582 | |
b5a82d62 AZ |
583 | dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n"); |
584 | ||
b74d2caa | 585 | i2c_set_clientdata(client, pcf8563); |
ede3e9d4 VD |
586 | pcf8563->client = client; |
587 | device_set_wakeup_capable(&client->dev, 1); | |
b74d2caa | 588 | |
ff0bc501 JK |
589 | /* Set timer to lowest frequency to save power (ref Haoyu datasheet) */ |
590 | buf = PCF8563_TMRC_1_60; | |
591 | err = pcf8563_write_block_data(client, PCF8563_REG_TMRC, 1, &buf); | |
592 | if (err < 0) { | |
593 | dev_err(&client->dev, "%s: write error\n", __func__); | |
594 | return err; | |
595 | } | |
596 | ||
a45d528a | 597 | err = pcf8563_get_alarm_mode(client, NULL, &alm_pending); |
cd1420d3 | 598 | if (err) { |
a45d528a JK |
599 | dev_err(&client->dev, "%s: read error\n", __func__); |
600 | return err; | |
601 | } | |
602 | if (alm_pending) | |
603 | pcf8563_set_alarm_mode(client, 0); | |
604 | ||
d6fbdc34 JH |
605 | pcf8563->rtc = devm_rtc_device_register(&client->dev, |
606 | pcf8563_driver.driver.name, | |
607 | &pcf8563_rtc_ops, THIS_MODULE); | |
b5a82d62 | 608 | |
ede3e9d4 VD |
609 | if (IS_ERR(pcf8563->rtc)) |
610 | return PTR_ERR(pcf8563->rtc); | |
611 | ||
612 | if (client->irq > 0) { | |
613 | err = devm_request_threaded_irq(&client->dev, client->irq, | |
614 | NULL, pcf8563_irq, | |
615 | IRQF_SHARED|IRQF_ONESHOT|IRQF_TRIGGER_FALLING, | |
616 | pcf8563->rtc->name, client); | |
617 | if (err) { | |
618 | dev_err(&client->dev, "unable to request IRQ %d\n", | |
619 | client->irq); | |
620 | return err; | |
621 | } | |
622 | ||
623 | } | |
624 | ||
a39a6405 HS |
625 | #ifdef CONFIG_COMMON_CLK |
626 | /* register clk in common clk framework */ | |
627 | pcf8563_clkout_register_clk(pcf8563); | |
628 | #endif | |
629 | ||
599cda55 JK |
630 | /* the pcf8563 alarm only supports a minute accuracy */ |
631 | pcf8563->rtc->uie_unsupported = 1; | |
632 | ||
ede3e9d4 | 633 | return 0; |
b5a82d62 AZ |
634 | } |
635 | ||
3760f736 JD |
636 | static const struct i2c_device_id pcf8563_id[] = { |
637 | { "pcf8563", 0 }, | |
8ea9212c | 638 | { "rtc8564", 0 }, |
3760f736 JD |
639 | { } |
640 | }; | |
641 | MODULE_DEVICE_TABLE(i2c, pcf8563_id); | |
642 | ||
8dccaf06 | 643 | #ifdef CONFIG_OF |
5a167f45 | 644 | static const struct of_device_id pcf8563_of_match[] = { |
8dccaf06 NB |
645 | { .compatible = "nxp,pcf8563" }, |
646 | {} | |
647 | }; | |
648 | MODULE_DEVICE_TABLE(of, pcf8563_of_match); | |
649 | #endif | |
650 | ||
e5fc9cc0 AZ |
651 | static struct i2c_driver pcf8563_driver = { |
652 | .driver = { | |
653 | .name = "rtc-pcf8563", | |
8dccaf06 | 654 | .of_match_table = of_match_ptr(pcf8563_of_match), |
e5fc9cc0 AZ |
655 | }, |
656 | .probe = pcf8563_probe, | |
3760f736 | 657 | .id_table = pcf8563_id, |
e5fc9cc0 AZ |
658 | }; |
659 | ||
0abc9201 | 660 | module_i2c_driver(pcf8563_driver); |
b5a82d62 AZ |
661 | |
662 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | |
663 | MODULE_DESCRIPTION("Philips PCF8563/Epson RTC8564 RTC driver"); | |
664 | MODULE_LICENSE("GPL"); | |
665 | MODULE_VERSION(DRV_VERSION); |