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1 | /* | |
2 | * rtc-ds1307.c - RTC driver for some mostly-compatible I2C chips. | |
3 | * | |
4 | * Copyright (C) 2005 James Chapman (ds1337 core) | |
5 | * Copyright (C) 2006 David Brownell | |
6 | * Copyright (C) 2009 Matthias Fuchs (rx8025 support) | |
7 | * Copyright (C) 2012 Bertrand Achard (nvram access fixes) | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/acpi.h> | |
15 | #include <linux/bcd.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/of_device.h> | |
20 | #include <linux/rtc/ds1307.h> | |
21 | #include <linux/rtc.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/hwmon.h> | |
25 | #include <linux/hwmon-sysfs.h> | |
26 | #include <linux/clk-provider.h> | |
27 | #include <linux/regmap.h> | |
28 | ||
29 | /* | |
30 | * We can't determine type by probing, but if we expect pre-Linux code | |
31 | * to have set the chip up as a clock (turning on the oscillator and | |
32 | * setting the date and time), Linux can ignore the non-clock features. | |
33 | * That's a natural job for a factory or repair bench. | |
34 | */ | |
35 | enum ds_type { | |
36 | ds_1307, | |
37 | ds_1308, | |
38 | ds_1337, | |
39 | ds_1338, | |
40 | ds_1339, | |
41 | ds_1340, | |
42 | ds_1388, | |
43 | ds_3231, | |
44 | m41t0, | |
45 | m41t00, | |
46 | mcp794xx, | |
47 | rx_8025, | |
48 | rx_8130, | |
49 | last_ds_type /* always last */ | |
50 | /* rs5c372 too? different address... */ | |
51 | }; | |
52 | ||
53 | ||
54 | /* RTC registers don't differ much, except for the century flag */ | |
55 | #define DS1307_REG_SECS 0x00 /* 00-59 */ | |
56 | # define DS1307_BIT_CH 0x80 | |
57 | # define DS1340_BIT_nEOSC 0x80 | |
58 | # define MCP794XX_BIT_ST 0x80 | |
59 | #define DS1307_REG_MIN 0x01 /* 00-59 */ | |
60 | # define M41T0_BIT_OF 0x80 | |
61 | #define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */ | |
62 | # define DS1307_BIT_12HR 0x40 /* in REG_HOUR */ | |
63 | # define DS1307_BIT_PM 0x20 /* in REG_HOUR */ | |
64 | # define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */ | |
65 | # define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */ | |
66 | #define DS1307_REG_WDAY 0x03 /* 01-07 */ | |
67 | # define MCP794XX_BIT_VBATEN 0x08 | |
68 | #define DS1307_REG_MDAY 0x04 /* 01-31 */ | |
69 | #define DS1307_REG_MONTH 0x05 /* 01-12 */ | |
70 | # define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */ | |
71 | #define DS1307_REG_YEAR 0x06 /* 00-99 */ | |
72 | ||
73 | /* | |
74 | * Other registers (control, status, alarms, trickle charge, NVRAM, etc) | |
75 | * start at 7, and they differ a LOT. Only control and status matter for | |
76 | * basic RTC date and time functionality; be careful using them. | |
77 | */ | |
78 | #define DS1307_REG_CONTROL 0x07 /* or ds1338 */ | |
79 | # define DS1307_BIT_OUT 0x80 | |
80 | # define DS1338_BIT_OSF 0x20 | |
81 | # define DS1307_BIT_SQWE 0x10 | |
82 | # define DS1307_BIT_RS1 0x02 | |
83 | # define DS1307_BIT_RS0 0x01 | |
84 | #define DS1337_REG_CONTROL 0x0e | |
85 | # define DS1337_BIT_nEOSC 0x80 | |
86 | # define DS1339_BIT_BBSQI 0x20 | |
87 | # define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */ | |
88 | # define DS1337_BIT_RS2 0x10 | |
89 | # define DS1337_BIT_RS1 0x08 | |
90 | # define DS1337_BIT_INTCN 0x04 | |
91 | # define DS1337_BIT_A2IE 0x02 | |
92 | # define DS1337_BIT_A1IE 0x01 | |
93 | #define DS1340_REG_CONTROL 0x07 | |
94 | # define DS1340_BIT_OUT 0x80 | |
95 | # define DS1340_BIT_FT 0x40 | |
96 | # define DS1340_BIT_CALIB_SIGN 0x20 | |
97 | # define DS1340_M_CALIBRATION 0x1f | |
98 | #define DS1340_REG_FLAG 0x09 | |
99 | # define DS1340_BIT_OSF 0x80 | |
100 | #define DS1337_REG_STATUS 0x0f | |
101 | # define DS1337_BIT_OSF 0x80 | |
102 | # define DS3231_BIT_EN32KHZ 0x08 | |
103 | # define DS1337_BIT_A2I 0x02 | |
104 | # define DS1337_BIT_A1I 0x01 | |
105 | #define DS1339_REG_ALARM1_SECS 0x07 | |
106 | ||
107 | #define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0 | |
108 | ||
109 | #define RX8025_REG_CTRL1 0x0e | |
110 | # define RX8025_BIT_2412 0x20 | |
111 | #define RX8025_REG_CTRL2 0x0f | |
112 | # define RX8025_BIT_PON 0x10 | |
113 | # define RX8025_BIT_VDET 0x40 | |
114 | # define RX8025_BIT_XST 0x20 | |
115 | ||
116 | ||
117 | struct ds1307 { | |
118 | u8 offset; /* register's offset */ | |
119 | u8 regs[11]; | |
120 | u16 nvram_offset; | |
121 | struct nvmem_config nvmem_cfg; | |
122 | enum ds_type type; | |
123 | unsigned long flags; | |
124 | #define HAS_NVRAM 0 /* bit 0 == sysfs file active */ | |
125 | #define HAS_ALARM 1 /* bit 1 == irq claimed */ | |
126 | struct device *dev; | |
127 | struct regmap *regmap; | |
128 | const char *name; | |
129 | int irq; | |
130 | struct rtc_device *rtc; | |
131 | #ifdef CONFIG_COMMON_CLK | |
132 | struct clk_hw clks[2]; | |
133 | #endif | |
134 | }; | |
135 | ||
136 | struct chip_desc { | |
137 | unsigned alarm:1; | |
138 | u16 nvram_offset; | |
139 | u16 nvram_size; | |
140 | u8 century_reg; | |
141 | u8 century_enable_bit; | |
142 | u8 century_bit; | |
143 | u16 trickle_charger_reg; | |
144 | u8 trickle_charger_setup; | |
145 | u8 (*do_trickle_setup)(struct ds1307 *, uint32_t, | |
146 | bool); | |
147 | }; | |
148 | ||
149 | static u8 do_trickle_setup_ds1339(struct ds1307 *, uint32_t ohms, bool diode); | |
150 | ||
151 | static struct chip_desc chips[last_ds_type] = { | |
152 | [ds_1307] = { | |
153 | .nvram_offset = 8, | |
154 | .nvram_size = 56, | |
155 | }, | |
156 | [ds_1308] = { | |
157 | .nvram_offset = 8, | |
158 | .nvram_size = 56, | |
159 | }, | |
160 | [ds_1337] = { | |
161 | .alarm = 1, | |
162 | .century_reg = DS1307_REG_MONTH, | |
163 | .century_bit = DS1337_BIT_CENTURY, | |
164 | }, | |
165 | [ds_1338] = { | |
166 | .nvram_offset = 8, | |
167 | .nvram_size = 56, | |
168 | }, | |
169 | [ds_1339] = { | |
170 | .alarm = 1, | |
171 | .century_reg = DS1307_REG_MONTH, | |
172 | .century_bit = DS1337_BIT_CENTURY, | |
173 | .trickle_charger_reg = 0x10, | |
174 | .do_trickle_setup = &do_trickle_setup_ds1339, | |
175 | }, | |
176 | [ds_1340] = { | |
177 | .century_reg = DS1307_REG_HOUR, | |
178 | .century_enable_bit = DS1340_BIT_CENTURY_EN, | |
179 | .century_bit = DS1340_BIT_CENTURY, | |
180 | .trickle_charger_reg = 0x08, | |
181 | }, | |
182 | [ds_1388] = { | |
183 | .trickle_charger_reg = 0x0a, | |
184 | }, | |
185 | [ds_3231] = { | |
186 | .alarm = 1, | |
187 | .century_reg = DS1307_REG_MONTH, | |
188 | .century_bit = DS1337_BIT_CENTURY, | |
189 | }, | |
190 | [rx_8130] = { | |
191 | .alarm = 1, | |
192 | /* this is battery backed SRAM */ | |
193 | .nvram_offset = 0x20, | |
194 | .nvram_size = 4, /* 32bit (4 word x 8 bit) */ | |
195 | }, | |
196 | [mcp794xx] = { | |
197 | .alarm = 1, | |
198 | /* this is battery backed SRAM */ | |
199 | .nvram_offset = 0x20, | |
200 | .nvram_size = 0x40, | |
201 | }, | |
202 | }; | |
203 | ||
204 | static const struct i2c_device_id ds1307_id[] = { | |
205 | { "ds1307", ds_1307 }, | |
206 | { "ds1308", ds_1308 }, | |
207 | { "ds1337", ds_1337 }, | |
208 | { "ds1338", ds_1338 }, | |
209 | { "ds1339", ds_1339 }, | |
210 | { "ds1388", ds_1388 }, | |
211 | { "ds1340", ds_1340 }, | |
212 | { "ds3231", ds_3231 }, | |
213 | { "m41t0", m41t0 }, | |
214 | { "m41t00", m41t00 }, | |
215 | { "mcp7940x", mcp794xx }, | |
216 | { "mcp7941x", mcp794xx }, | |
217 | { "pt7c4338", ds_1307 }, | |
218 | { "rx8025", rx_8025 }, | |
219 | { "isl12057", ds_1337 }, | |
220 | { "rx8130", rx_8130 }, | |
221 | { } | |
222 | }; | |
223 | MODULE_DEVICE_TABLE(i2c, ds1307_id); | |
224 | ||
225 | #ifdef CONFIG_OF | |
226 | static const struct of_device_id ds1307_of_match[] = { | |
227 | { | |
228 | .compatible = "dallas,ds1307", | |
229 | .data = (void *)ds_1307 | |
230 | }, | |
231 | { | |
232 | .compatible = "dallas,ds1308", | |
233 | .data = (void *)ds_1308 | |
234 | }, | |
235 | { | |
236 | .compatible = "dallas,ds1337", | |
237 | .data = (void *)ds_1337 | |
238 | }, | |
239 | { | |
240 | .compatible = "dallas,ds1338", | |
241 | .data = (void *)ds_1338 | |
242 | }, | |
243 | { | |
244 | .compatible = "dallas,ds1339", | |
245 | .data = (void *)ds_1339 | |
246 | }, | |
247 | { | |
248 | .compatible = "dallas,ds1388", | |
249 | .data = (void *)ds_1388 | |
250 | }, | |
251 | { | |
252 | .compatible = "dallas,ds1340", | |
253 | .data = (void *)ds_1340 | |
254 | }, | |
255 | { | |
256 | .compatible = "maxim,ds3231", | |
257 | .data = (void *)ds_3231 | |
258 | }, | |
259 | { | |
260 | .compatible = "st,m41t0", | |
261 | .data = (void *)m41t00 | |
262 | }, | |
263 | { | |
264 | .compatible = "st,m41t00", | |
265 | .data = (void *)m41t00 | |
266 | }, | |
267 | { | |
268 | .compatible = "microchip,mcp7940x", | |
269 | .data = (void *)mcp794xx | |
270 | }, | |
271 | { | |
272 | .compatible = "microchip,mcp7941x", | |
273 | .data = (void *)mcp794xx | |
274 | }, | |
275 | { | |
276 | .compatible = "pericom,pt7c4338", | |
277 | .data = (void *)ds_1307 | |
278 | }, | |
279 | { | |
280 | .compatible = "epson,rx8025", | |
281 | .data = (void *)rx_8025 | |
282 | }, | |
283 | { | |
284 | .compatible = "isil,isl12057", | |
285 | .data = (void *)ds_1337 | |
286 | }, | |
287 | { } | |
288 | }; | |
289 | MODULE_DEVICE_TABLE(of, ds1307_of_match); | |
290 | #endif | |
291 | ||
292 | #ifdef CONFIG_ACPI | |
293 | static const struct acpi_device_id ds1307_acpi_ids[] = { | |
294 | { .id = "DS1307", .driver_data = ds_1307 }, | |
295 | { .id = "DS1308", .driver_data = ds_1308 }, | |
296 | { .id = "DS1337", .driver_data = ds_1337 }, | |
297 | { .id = "DS1338", .driver_data = ds_1338 }, | |
298 | { .id = "DS1339", .driver_data = ds_1339 }, | |
299 | { .id = "DS1388", .driver_data = ds_1388 }, | |
300 | { .id = "DS1340", .driver_data = ds_1340 }, | |
301 | { .id = "DS3231", .driver_data = ds_3231 }, | |
302 | { .id = "M41T0", .driver_data = m41t0 }, | |
303 | { .id = "M41T00", .driver_data = m41t00 }, | |
304 | { .id = "MCP7940X", .driver_data = mcp794xx }, | |
305 | { .id = "MCP7941X", .driver_data = mcp794xx }, | |
306 | { .id = "PT7C4338", .driver_data = ds_1307 }, | |
307 | { .id = "RX8025", .driver_data = rx_8025 }, | |
308 | { .id = "ISL12057", .driver_data = ds_1337 }, | |
309 | { } | |
310 | }; | |
311 | MODULE_DEVICE_TABLE(acpi, ds1307_acpi_ids); | |
312 | #endif | |
313 | ||
314 | /* | |
315 | * The ds1337 and ds1339 both have two alarms, but we only use the first | |
316 | * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm | |
317 | * signal; ds1339 chips have only one alarm signal. | |
318 | */ | |
319 | static irqreturn_t ds1307_irq(int irq, void *dev_id) | |
320 | { | |
321 | struct ds1307 *ds1307 = dev_id; | |
322 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
323 | int stat, ret; | |
324 | ||
325 | mutex_lock(lock); | |
326 | ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &stat); | |
327 | if (ret) | |
328 | goto out; | |
329 | ||
330 | if (stat & DS1337_BIT_A1I) { | |
331 | stat &= ~DS1337_BIT_A1I; | |
332 | regmap_write(ds1307->regmap, DS1337_REG_STATUS, stat); | |
333 | ||
334 | ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL, | |
335 | DS1337_BIT_A1IE, 0); | |
336 | if (ret) | |
337 | goto out; | |
338 | ||
339 | rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); | |
340 | } | |
341 | ||
342 | out: | |
343 | mutex_unlock(lock); | |
344 | ||
345 | return IRQ_HANDLED; | |
346 | } | |
347 | ||
348 | /*----------------------------------------------------------------------*/ | |
349 | ||
350 | static int ds1307_get_time(struct device *dev, struct rtc_time *t) | |
351 | { | |
352 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
353 | int tmp, ret; | |
354 | const struct chip_desc *chip = &chips[ds1307->type]; | |
355 | ||
356 | /* read the RTC date and time registers all at once */ | |
357 | ret = regmap_bulk_read(ds1307->regmap, ds1307->offset, ds1307->regs, 7); | |
358 | if (ret) { | |
359 | dev_err(dev, "%s error %d\n", "read", ret); | |
360 | return ret; | |
361 | } | |
362 | ||
363 | dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs); | |
364 | ||
365 | /* if oscillator fail bit is set, no data can be trusted */ | |
366 | if (ds1307->type == m41t0 && | |
367 | ds1307->regs[DS1307_REG_MIN] & M41T0_BIT_OF) { | |
368 | dev_warn_once(dev, "oscillator failed, set time!\n"); | |
369 | return -EINVAL; | |
370 | } | |
371 | ||
372 | t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f); | |
373 | t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f); | |
374 | tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f; | |
375 | t->tm_hour = bcd2bin(tmp); | |
376 | t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1; | |
377 | t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f); | |
378 | tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f; | |
379 | t->tm_mon = bcd2bin(tmp) - 1; | |
380 | t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100; | |
381 | ||
382 | if (ds1307->regs[chip->century_reg] & chip->century_bit && | |
383 | IS_ENABLED(CONFIG_RTC_DRV_DS1307_CENTURY)) | |
384 | t->tm_year += 100; | |
385 | ||
386 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
387 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", | |
388 | "read", t->tm_sec, t->tm_min, | |
389 | t->tm_hour, t->tm_mday, | |
390 | t->tm_mon, t->tm_year, t->tm_wday); | |
391 | ||
392 | /* initial clock setting can be undefined */ | |
393 | return rtc_valid_tm(t); | |
394 | } | |
395 | ||
396 | static int ds1307_set_time(struct device *dev, struct rtc_time *t) | |
397 | { | |
398 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
399 | const struct chip_desc *chip = &chips[ds1307->type]; | |
400 | int result; | |
401 | int tmp; | |
402 | u8 *buf = ds1307->regs; | |
403 | ||
404 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
405 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", | |
406 | "write", t->tm_sec, t->tm_min, | |
407 | t->tm_hour, t->tm_mday, | |
408 | t->tm_mon, t->tm_year, t->tm_wday); | |
409 | ||
410 | if (t->tm_year < 100) | |
411 | return -EINVAL; | |
412 | ||
413 | #ifdef CONFIG_RTC_DRV_DS1307_CENTURY | |
414 | if (t->tm_year > (chip->century_bit ? 299 : 199)) | |
415 | return -EINVAL; | |
416 | #else | |
417 | if (t->tm_year > 199) | |
418 | return -EINVAL; | |
419 | #endif | |
420 | ||
421 | buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec); | |
422 | buf[DS1307_REG_MIN] = bin2bcd(t->tm_min); | |
423 | buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour); | |
424 | buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1); | |
425 | buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday); | |
426 | buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1); | |
427 | ||
428 | /* assume 20YY not 19YY */ | |
429 | tmp = t->tm_year - 100; | |
430 | buf[DS1307_REG_YEAR] = bin2bcd(tmp); | |
431 | ||
432 | if (chip->century_enable_bit) | |
433 | buf[chip->century_reg] |= chip->century_enable_bit; | |
434 | if (t->tm_year > 199 && chip->century_bit) | |
435 | buf[chip->century_reg] |= chip->century_bit; | |
436 | ||
437 | if (ds1307->type == mcp794xx) { | |
438 | /* | |
439 | * these bits were cleared when preparing the date/time | |
440 | * values and need to be set again before writing the | |
441 | * buffer out to the device. | |
442 | */ | |
443 | buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST; | |
444 | buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN; | |
445 | } | |
446 | ||
447 | dev_dbg(dev, "%s: %7ph\n", "write", buf); | |
448 | ||
449 | result = regmap_bulk_write(ds1307->regmap, ds1307->offset, buf, 7); | |
450 | if (result) { | |
451 | dev_err(dev, "%s error %d\n", "write", result); | |
452 | return result; | |
453 | } | |
454 | return 0; | |
455 | } | |
456 | ||
457 | static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
458 | { | |
459 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
460 | int ret; | |
461 | ||
462 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
463 | return -EINVAL; | |
464 | ||
465 | /* read all ALARM1, ALARM2, and status registers at once */ | |
466 | ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, | |
467 | ds1307->regs, 9); | |
468 | if (ret) { | |
469 | dev_err(dev, "%s error %d\n", "alarm read", ret); | |
470 | return ret; | |
471 | } | |
472 | ||
473 | dev_dbg(dev, "%s: %4ph, %3ph, %2ph\n", "alarm read", | |
474 | &ds1307->regs[0], &ds1307->regs[4], &ds1307->regs[7]); | |
475 | ||
476 | /* | |
477 | * report alarm time (ALARM1); assume 24 hour and day-of-month modes, | |
478 | * and that all four fields are checked matches | |
479 | */ | |
480 | t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f); | |
481 | t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f); | |
482 | t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f); | |
483 | t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f); | |
484 | ||
485 | /* ... and status */ | |
486 | t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE); | |
487 | t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I); | |
488 | ||
489 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
490 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", | |
491 | "alarm read", t->time.tm_sec, t->time.tm_min, | |
492 | t->time.tm_hour, t->time.tm_mday, | |
493 | t->enabled, t->pending); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
499 | { | |
500 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
501 | unsigned char *buf = ds1307->regs; | |
502 | u8 control, status; | |
503 | int ret; | |
504 | ||
505 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
506 | return -EINVAL; | |
507 | ||
508 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
509 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", | |
510 | "alarm set", t->time.tm_sec, t->time.tm_min, | |
511 | t->time.tm_hour, t->time.tm_mday, | |
512 | t->enabled, t->pending); | |
513 | ||
514 | /* read current status of both alarms and the chip */ | |
515 | ret = regmap_bulk_read(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9); | |
516 | if (ret) { | |
517 | dev_err(dev, "%s error %d\n", "alarm write", ret); | |
518 | return ret; | |
519 | } | |
520 | control = ds1307->regs[7]; | |
521 | status = ds1307->regs[8]; | |
522 | ||
523 | dev_dbg(dev, "%s: %4ph, %3ph, %02x %02x\n", "alarm set (old status)", | |
524 | &ds1307->regs[0], &ds1307->regs[4], control, status); | |
525 | ||
526 | /* set ALARM1, using 24 hour and day-of-month modes */ | |
527 | buf[0] = bin2bcd(t->time.tm_sec); | |
528 | buf[1] = bin2bcd(t->time.tm_min); | |
529 | buf[2] = bin2bcd(t->time.tm_hour); | |
530 | buf[3] = bin2bcd(t->time.tm_mday); | |
531 | ||
532 | /* set ALARM2 to non-garbage */ | |
533 | buf[4] = 0; | |
534 | buf[5] = 0; | |
535 | buf[6] = 0; | |
536 | ||
537 | /* disable alarms */ | |
538 | buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE); | |
539 | buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I); | |
540 | ||
541 | ret = regmap_bulk_write(ds1307->regmap, DS1339_REG_ALARM1_SECS, buf, 9); | |
542 | if (ret) { | |
543 | dev_err(dev, "can't set alarm time\n"); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | /* optionally enable ALARM1 */ | |
548 | if (t->enabled) { | |
549 | dev_dbg(dev, "alarm IRQ armed\n"); | |
550 | buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */ | |
551 | regmap_write(ds1307->regmap, DS1337_REG_CONTROL, buf[7]); | |
552 | } | |
553 | ||
554 | return 0; | |
555 | } | |
556 | ||
557 | static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
558 | { | |
559 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
560 | ||
561 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
562 | return -ENOTTY; | |
563 | ||
564 | return regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL, | |
565 | DS1337_BIT_A1IE, | |
566 | enabled ? DS1337_BIT_A1IE : 0); | |
567 | } | |
568 | ||
569 | static const struct rtc_class_ops ds13xx_rtc_ops = { | |
570 | .read_time = ds1307_get_time, | |
571 | .set_time = ds1307_set_time, | |
572 | .read_alarm = ds1337_read_alarm, | |
573 | .set_alarm = ds1337_set_alarm, | |
574 | .alarm_irq_enable = ds1307_alarm_irq_enable, | |
575 | }; | |
576 | ||
577 | /*----------------------------------------------------------------------*/ | |
578 | ||
579 | /* | |
580 | * Alarm support for rx8130 devices. | |
581 | */ | |
582 | ||
583 | #define RX8130_REG_ALARM_MIN 0x07 | |
584 | #define RX8130_REG_ALARM_HOUR 0x08 | |
585 | #define RX8130_REG_ALARM_WEEK_OR_DAY 0x09 | |
586 | #define RX8130_REG_EXTENSION 0x0c | |
587 | #define RX8130_REG_EXTENSION_WADA (1 << 3) | |
588 | #define RX8130_REG_FLAG 0x0d | |
589 | #define RX8130_REG_FLAG_AF (1 << 3) | |
590 | #define RX8130_REG_CONTROL0 0x0e | |
591 | #define RX8130_REG_CONTROL0_AIE (1 << 3) | |
592 | ||
593 | static irqreturn_t rx8130_irq(int irq, void *dev_id) | |
594 | { | |
595 | struct ds1307 *ds1307 = dev_id; | |
596 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
597 | u8 ctl[3]; | |
598 | int ret; | |
599 | ||
600 | mutex_lock(lock); | |
601 | ||
602 | /* Read control registers. */ | |
603 | ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); | |
604 | if (ret < 0) | |
605 | goto out; | |
606 | if (!(ctl[1] & RX8130_REG_FLAG_AF)) | |
607 | goto out; | |
608 | ctl[1] &= ~RX8130_REG_FLAG_AF; | |
609 | ctl[2] &= ~RX8130_REG_CONTROL0_AIE; | |
610 | ||
611 | ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); | |
612 | if (ret < 0) | |
613 | goto out; | |
614 | ||
615 | rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); | |
616 | ||
617 | out: | |
618 | mutex_unlock(lock); | |
619 | ||
620 | return IRQ_HANDLED; | |
621 | } | |
622 | ||
623 | static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
624 | { | |
625 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
626 | u8 ald[3], ctl[3]; | |
627 | int ret; | |
628 | ||
629 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
630 | return -EINVAL; | |
631 | ||
632 | /* Read alarm registers. */ | |
633 | ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3); | |
634 | if (ret < 0) | |
635 | return ret; | |
636 | ||
637 | /* Read control registers. */ | |
638 | ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); | |
639 | if (ret < 0) | |
640 | return ret; | |
641 | ||
642 | t->enabled = !!(ctl[2] & RX8130_REG_CONTROL0_AIE); | |
643 | t->pending = !!(ctl[1] & RX8130_REG_FLAG_AF); | |
644 | ||
645 | /* Report alarm 0 time assuming 24-hour and day-of-month modes. */ | |
646 | t->time.tm_sec = -1; | |
647 | t->time.tm_min = bcd2bin(ald[0] & 0x7f); | |
648 | t->time.tm_hour = bcd2bin(ald[1] & 0x7f); | |
649 | t->time.tm_wday = -1; | |
650 | t->time.tm_mday = bcd2bin(ald[2] & 0x7f); | |
651 | t->time.tm_mon = -1; | |
652 | t->time.tm_year = -1; | |
653 | t->time.tm_yday = -1; | |
654 | t->time.tm_isdst = -1; | |
655 | ||
656 | dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d enabled=%d\n", | |
657 | __func__, t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
658 | t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled); | |
659 | ||
660 | return 0; | |
661 | } | |
662 | ||
663 | static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
664 | { | |
665 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
666 | u8 ald[3], ctl[3]; | |
667 | int ret; | |
668 | ||
669 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
670 | return -EINVAL; | |
671 | ||
672 | dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d " | |
673 | "enabled=%d pending=%d\n", __func__, | |
674 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
675 | t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, | |
676 | t->enabled, t->pending); | |
677 | ||
678 | /* Read control registers. */ | |
679 | ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); | |
680 | if (ret < 0) | |
681 | return ret; | |
682 | ||
683 | ctl[0] &= ~RX8130_REG_EXTENSION_WADA; | |
684 | ctl[1] |= RX8130_REG_FLAG_AF; | |
685 | ctl[2] &= ~RX8130_REG_CONTROL0_AIE; | |
686 | ||
687 | ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); | |
688 | if (ret < 0) | |
689 | return ret; | |
690 | ||
691 | /* Hardware alarm precision is 1 minute! */ | |
692 | ald[0] = bin2bcd(t->time.tm_min); | |
693 | ald[1] = bin2bcd(t->time.tm_hour); | |
694 | ald[2] = bin2bcd(t->time.tm_mday); | |
695 | ||
696 | ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3); | |
697 | if (ret < 0) | |
698 | return ret; | |
699 | ||
700 | if (!t->enabled) | |
701 | return 0; | |
702 | ||
703 | ctl[2] |= RX8130_REG_CONTROL0_AIE; | |
704 | ||
705 | return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3); | |
706 | } | |
707 | ||
708 | static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
709 | { | |
710 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
711 | int ret, reg; | |
712 | ||
713 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
714 | return -EINVAL; | |
715 | ||
716 | ret = regmap_read(ds1307->regmap, RX8130_REG_CONTROL0, ®); | |
717 | if (ret < 0) | |
718 | return ret; | |
719 | ||
720 | if (enabled) | |
721 | reg |= RX8130_REG_CONTROL0_AIE; | |
722 | else | |
723 | reg &= ~RX8130_REG_CONTROL0_AIE; | |
724 | ||
725 | return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, reg); | |
726 | } | |
727 | ||
728 | static const struct rtc_class_ops rx8130_rtc_ops = { | |
729 | .read_time = ds1307_get_time, | |
730 | .set_time = ds1307_set_time, | |
731 | .read_alarm = rx8130_read_alarm, | |
732 | .set_alarm = rx8130_set_alarm, | |
733 | .alarm_irq_enable = rx8130_alarm_irq_enable, | |
734 | }; | |
735 | ||
736 | /*----------------------------------------------------------------------*/ | |
737 | ||
738 | /* | |
739 | * Alarm support for mcp794xx devices. | |
740 | */ | |
741 | ||
742 | #define MCP794XX_REG_WEEKDAY 0x3 | |
743 | #define MCP794XX_REG_WEEKDAY_WDAY_MASK 0x7 | |
744 | #define MCP794XX_REG_CONTROL 0x07 | |
745 | # define MCP794XX_BIT_ALM0_EN 0x10 | |
746 | # define MCP794XX_BIT_ALM1_EN 0x20 | |
747 | #define MCP794XX_REG_ALARM0_BASE 0x0a | |
748 | #define MCP794XX_REG_ALARM0_CTRL 0x0d | |
749 | #define MCP794XX_REG_ALARM1_BASE 0x11 | |
750 | #define MCP794XX_REG_ALARM1_CTRL 0x14 | |
751 | # define MCP794XX_BIT_ALMX_IF (1 << 3) | |
752 | # define MCP794XX_BIT_ALMX_C0 (1 << 4) | |
753 | # define MCP794XX_BIT_ALMX_C1 (1 << 5) | |
754 | # define MCP794XX_BIT_ALMX_C2 (1 << 6) | |
755 | # define MCP794XX_BIT_ALMX_POL (1 << 7) | |
756 | # define MCP794XX_MSK_ALMX_MATCH (MCP794XX_BIT_ALMX_C0 | \ | |
757 | MCP794XX_BIT_ALMX_C1 | \ | |
758 | MCP794XX_BIT_ALMX_C2) | |
759 | ||
760 | static irqreturn_t mcp794xx_irq(int irq, void *dev_id) | |
761 | { | |
762 | struct ds1307 *ds1307 = dev_id; | |
763 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
764 | int reg, ret; | |
765 | ||
766 | mutex_lock(lock); | |
767 | ||
768 | /* Check and clear alarm 0 interrupt flag. */ | |
769 | ret = regmap_read(ds1307->regmap, MCP794XX_REG_ALARM0_CTRL, ®); | |
770 | if (ret) | |
771 | goto out; | |
772 | if (!(reg & MCP794XX_BIT_ALMX_IF)) | |
773 | goto out; | |
774 | reg &= ~MCP794XX_BIT_ALMX_IF; | |
775 | ret = regmap_write(ds1307->regmap, MCP794XX_REG_ALARM0_CTRL, reg); | |
776 | if (ret) | |
777 | goto out; | |
778 | ||
779 | /* Disable alarm 0. */ | |
780 | ret = regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL, | |
781 | MCP794XX_BIT_ALM0_EN, 0); | |
782 | if (ret) | |
783 | goto out; | |
784 | ||
785 | rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); | |
786 | ||
787 | out: | |
788 | mutex_unlock(lock); | |
789 | ||
790 | return IRQ_HANDLED; | |
791 | } | |
792 | ||
793 | static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
794 | { | |
795 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
796 | u8 *regs = ds1307->regs; | |
797 | int ret; | |
798 | ||
799 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
800 | return -EINVAL; | |
801 | ||
802 | /* Read control and alarm 0 registers. */ | |
803 | ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10); | |
804 | if (ret) | |
805 | return ret; | |
806 | ||
807 | t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN); | |
808 | ||
809 | /* Report alarm 0 time assuming 24-hour and day-of-month modes. */ | |
810 | t->time.tm_sec = bcd2bin(ds1307->regs[3] & 0x7f); | |
811 | t->time.tm_min = bcd2bin(ds1307->regs[4] & 0x7f); | |
812 | t->time.tm_hour = bcd2bin(ds1307->regs[5] & 0x3f); | |
813 | t->time.tm_wday = bcd2bin(ds1307->regs[6] & 0x7) - 1; | |
814 | t->time.tm_mday = bcd2bin(ds1307->regs[7] & 0x3f); | |
815 | t->time.tm_mon = bcd2bin(ds1307->regs[8] & 0x1f) - 1; | |
816 | t->time.tm_year = -1; | |
817 | t->time.tm_yday = -1; | |
818 | t->time.tm_isdst = -1; | |
819 | ||
820 | dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d " | |
821 | "enabled=%d polarity=%d irq=%d match=%d\n", __func__, | |
822 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
823 | t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled, | |
824 | !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_POL), | |
825 | !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_IF), | |
826 | (ds1307->regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | ||
831 | static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
832 | { | |
833 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
834 | unsigned char *regs = ds1307->regs; | |
835 | int ret; | |
836 | ||
837 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
838 | return -EINVAL; | |
839 | ||
840 | dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d " | |
841 | "enabled=%d pending=%d\n", __func__, | |
842 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
843 | t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, | |
844 | t->enabled, t->pending); | |
845 | ||
846 | /* Read control and alarm 0 registers. */ | |
847 | ret = regmap_bulk_read(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10); | |
848 | if (ret) | |
849 | return ret; | |
850 | ||
851 | /* Set alarm 0, using 24-hour and day-of-month modes. */ | |
852 | regs[3] = bin2bcd(t->time.tm_sec); | |
853 | regs[4] = bin2bcd(t->time.tm_min); | |
854 | regs[5] = bin2bcd(t->time.tm_hour); | |
855 | regs[6] = bin2bcd(t->time.tm_wday + 1); | |
856 | regs[7] = bin2bcd(t->time.tm_mday); | |
857 | regs[8] = bin2bcd(t->time.tm_mon + 1); | |
858 | ||
859 | /* Clear the alarm 0 interrupt flag. */ | |
860 | regs[6] &= ~MCP794XX_BIT_ALMX_IF; | |
861 | /* Set alarm match: second, minute, hour, day, date, month. */ | |
862 | regs[6] |= MCP794XX_MSK_ALMX_MATCH; | |
863 | /* Disable interrupt. We will not enable until completely programmed */ | |
864 | regs[0] &= ~MCP794XX_BIT_ALM0_EN; | |
865 | ||
866 | ret = regmap_bulk_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs, 10); | |
867 | if (ret) | |
868 | return ret; | |
869 | ||
870 | if (!t->enabled) | |
871 | return 0; | |
872 | regs[0] |= MCP794XX_BIT_ALM0_EN; | |
873 | return regmap_write(ds1307->regmap, MCP794XX_REG_CONTROL, regs[0]); | |
874 | } | |
875 | ||
876 | static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
877 | { | |
878 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
879 | ||
880 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
881 | return -EINVAL; | |
882 | ||
883 | return regmap_update_bits(ds1307->regmap, MCP794XX_REG_CONTROL, | |
884 | MCP794XX_BIT_ALM0_EN, | |
885 | enabled ? MCP794XX_BIT_ALM0_EN : 0); | |
886 | } | |
887 | ||
888 | static const struct rtc_class_ops mcp794xx_rtc_ops = { | |
889 | .read_time = ds1307_get_time, | |
890 | .set_time = ds1307_set_time, | |
891 | .read_alarm = mcp794xx_read_alarm, | |
892 | .set_alarm = mcp794xx_set_alarm, | |
893 | .alarm_irq_enable = mcp794xx_alarm_irq_enable, | |
894 | }; | |
895 | ||
896 | /*----------------------------------------------------------------------*/ | |
897 | ||
898 | static int ds1307_nvram_read(void *priv, unsigned int offset, void *val, | |
899 | size_t bytes) | |
900 | { | |
901 | struct ds1307 *ds1307 = priv; | |
902 | ||
903 | return regmap_bulk_read(ds1307->regmap, ds1307->nvram_offset + offset, | |
904 | val, bytes); | |
905 | } | |
906 | ||
907 | static int ds1307_nvram_write(void *priv, unsigned int offset, void *val, | |
908 | size_t bytes) | |
909 | { | |
910 | struct ds1307 *ds1307 = priv; | |
911 | ||
912 | return regmap_bulk_write(ds1307->regmap, ds1307->nvram_offset + offset, | |
913 | val, bytes); | |
914 | } | |
915 | ||
916 | /*----------------------------------------------------------------------*/ | |
917 | ||
918 | static u8 do_trickle_setup_ds1339(struct ds1307 *ds1307, | |
919 | uint32_t ohms, bool diode) | |
920 | { | |
921 | u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE : | |
922 | DS1307_TRICKLE_CHARGER_NO_DIODE; | |
923 | ||
924 | switch (ohms) { | |
925 | case 250: | |
926 | setup |= DS1307_TRICKLE_CHARGER_250_OHM; | |
927 | break; | |
928 | case 2000: | |
929 | setup |= DS1307_TRICKLE_CHARGER_2K_OHM; | |
930 | break; | |
931 | case 4000: | |
932 | setup |= DS1307_TRICKLE_CHARGER_4K_OHM; | |
933 | break; | |
934 | default: | |
935 | dev_warn(ds1307->dev, | |
936 | "Unsupported ohm value %u in dt\n", ohms); | |
937 | return 0; | |
938 | } | |
939 | return setup; | |
940 | } | |
941 | ||
942 | static void ds1307_trickle_init(struct ds1307 *ds1307, | |
943 | struct chip_desc *chip) | |
944 | { | |
945 | uint32_t ohms = 0; | |
946 | bool diode = true; | |
947 | ||
948 | if (!chip->do_trickle_setup) | |
949 | goto out; | |
950 | if (device_property_read_u32(ds1307->dev, "trickle-resistor-ohms", | |
951 | &ohms)) | |
952 | goto out; | |
953 | if (device_property_read_bool(ds1307->dev, "trickle-diode-disable")) | |
954 | diode = false; | |
955 | chip->trickle_charger_setup = chip->do_trickle_setup(ds1307, | |
956 | ohms, diode); | |
957 | out: | |
958 | return; | |
959 | } | |
960 | ||
961 | /*----------------------------------------------------------------------*/ | |
962 | ||
963 | #ifdef CONFIG_RTC_DRV_DS1307_HWMON | |
964 | ||
965 | /* | |
966 | * Temperature sensor support for ds3231 devices. | |
967 | */ | |
968 | ||
969 | #define DS3231_REG_TEMPERATURE 0x11 | |
970 | ||
971 | /* | |
972 | * A user-initiated temperature conversion is not started by this function, | |
973 | * so the temperature is updated once every 64 seconds. | |
974 | */ | |
975 | static int ds3231_hwmon_read_temp(struct device *dev, s32 *mC) | |
976 | { | |
977 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
978 | u8 temp_buf[2]; | |
979 | s16 temp; | |
980 | int ret; | |
981 | ||
982 | ret = regmap_bulk_read(ds1307->regmap, DS3231_REG_TEMPERATURE, | |
983 | temp_buf, sizeof(temp_buf)); | |
984 | if (ret) | |
985 | return ret; | |
986 | /* | |
987 | * Temperature is represented as a 10-bit code with a resolution of | |
988 | * 0.25 degree celsius and encoded in two's complement format. | |
989 | */ | |
990 | temp = (temp_buf[0] << 8) | temp_buf[1]; | |
991 | temp >>= 6; | |
992 | *mC = temp * 250; | |
993 | ||
994 | return 0; | |
995 | } | |
996 | ||
997 | static ssize_t ds3231_hwmon_show_temp(struct device *dev, | |
998 | struct device_attribute *attr, char *buf) | |
999 | { | |
1000 | int ret; | |
1001 | s32 temp; | |
1002 | ||
1003 | ret = ds3231_hwmon_read_temp(dev, &temp); | |
1004 | if (ret) | |
1005 | return ret; | |
1006 | ||
1007 | return sprintf(buf, "%d\n", temp); | |
1008 | } | |
1009 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ds3231_hwmon_show_temp, | |
1010 | NULL, 0); | |
1011 | ||
1012 | static struct attribute *ds3231_hwmon_attrs[] = { | |
1013 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
1014 | NULL, | |
1015 | }; | |
1016 | ATTRIBUTE_GROUPS(ds3231_hwmon); | |
1017 | ||
1018 | static void ds1307_hwmon_register(struct ds1307 *ds1307) | |
1019 | { | |
1020 | struct device *dev; | |
1021 | ||
1022 | if (ds1307->type != ds_3231) | |
1023 | return; | |
1024 | ||
1025 | dev = devm_hwmon_device_register_with_groups(ds1307->dev, ds1307->name, | |
1026 | ds1307, ds3231_hwmon_groups); | |
1027 | if (IS_ERR(dev)) { | |
1028 | dev_warn(ds1307->dev, "unable to register hwmon device %ld\n", | |
1029 | PTR_ERR(dev)); | |
1030 | } | |
1031 | } | |
1032 | ||
1033 | #else | |
1034 | ||
1035 | static void ds1307_hwmon_register(struct ds1307 *ds1307) | |
1036 | { | |
1037 | } | |
1038 | ||
1039 | #endif /* CONFIG_RTC_DRV_DS1307_HWMON */ | |
1040 | ||
1041 | /*----------------------------------------------------------------------*/ | |
1042 | ||
1043 | /* | |
1044 | * Square-wave output support for DS3231 | |
1045 | * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3231.pdf | |
1046 | */ | |
1047 | #ifdef CONFIG_COMMON_CLK | |
1048 | ||
1049 | enum { | |
1050 | DS3231_CLK_SQW = 0, | |
1051 | DS3231_CLK_32KHZ, | |
1052 | }; | |
1053 | ||
1054 | #define clk_sqw_to_ds1307(clk) \ | |
1055 | container_of(clk, struct ds1307, clks[DS3231_CLK_SQW]) | |
1056 | #define clk_32khz_to_ds1307(clk) \ | |
1057 | container_of(clk, struct ds1307, clks[DS3231_CLK_32KHZ]) | |
1058 | ||
1059 | static int ds3231_clk_sqw_rates[] = { | |
1060 | 1, | |
1061 | 1024, | |
1062 | 4096, | |
1063 | 8192, | |
1064 | }; | |
1065 | ||
1066 | static int ds1337_write_control(struct ds1307 *ds1307, u8 mask, u8 value) | |
1067 | { | |
1068 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
1069 | int ret; | |
1070 | ||
1071 | mutex_lock(lock); | |
1072 | ret = regmap_update_bits(ds1307->regmap, DS1337_REG_CONTROL, | |
1073 | mask, value); | |
1074 | mutex_unlock(lock); | |
1075 | ||
1076 | return ret; | |
1077 | } | |
1078 | ||
1079 | static unsigned long ds3231_clk_sqw_recalc_rate(struct clk_hw *hw, | |
1080 | unsigned long parent_rate) | |
1081 | { | |
1082 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1083 | int control, ret; | |
1084 | int rate_sel = 0; | |
1085 | ||
1086 | ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control); | |
1087 | if (ret) | |
1088 | return ret; | |
1089 | if (control & DS1337_BIT_RS1) | |
1090 | rate_sel += 1; | |
1091 | if (control & DS1337_BIT_RS2) | |
1092 | rate_sel += 2; | |
1093 | ||
1094 | return ds3231_clk_sqw_rates[rate_sel]; | |
1095 | } | |
1096 | ||
1097 | static long ds3231_clk_sqw_round_rate(struct clk_hw *hw, unsigned long rate, | |
1098 | unsigned long *prate) | |
1099 | { | |
1100 | int i; | |
1101 | ||
1102 | for (i = ARRAY_SIZE(ds3231_clk_sqw_rates) - 1; i >= 0; i--) { | |
1103 | if (ds3231_clk_sqw_rates[i] <= rate) | |
1104 | return ds3231_clk_sqw_rates[i]; | |
1105 | } | |
1106 | ||
1107 | return 0; | |
1108 | } | |
1109 | ||
1110 | static int ds3231_clk_sqw_set_rate(struct clk_hw *hw, unsigned long rate, | |
1111 | unsigned long parent_rate) | |
1112 | { | |
1113 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1114 | int control = 0; | |
1115 | int rate_sel; | |
1116 | ||
1117 | for (rate_sel = 0; rate_sel < ARRAY_SIZE(ds3231_clk_sqw_rates); | |
1118 | rate_sel++) { | |
1119 | if (ds3231_clk_sqw_rates[rate_sel] == rate) | |
1120 | break; | |
1121 | } | |
1122 | ||
1123 | if (rate_sel == ARRAY_SIZE(ds3231_clk_sqw_rates)) | |
1124 | return -EINVAL; | |
1125 | ||
1126 | if (rate_sel & 1) | |
1127 | control |= DS1337_BIT_RS1; | |
1128 | if (rate_sel & 2) | |
1129 | control |= DS1337_BIT_RS2; | |
1130 | ||
1131 | return ds1337_write_control(ds1307, DS1337_BIT_RS1 | DS1337_BIT_RS2, | |
1132 | control); | |
1133 | } | |
1134 | ||
1135 | static int ds3231_clk_sqw_prepare(struct clk_hw *hw) | |
1136 | { | |
1137 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1138 | ||
1139 | return ds1337_write_control(ds1307, DS1337_BIT_INTCN, 0); | |
1140 | } | |
1141 | ||
1142 | static void ds3231_clk_sqw_unprepare(struct clk_hw *hw) | |
1143 | { | |
1144 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1145 | ||
1146 | ds1337_write_control(ds1307, DS1337_BIT_INTCN, DS1337_BIT_INTCN); | |
1147 | } | |
1148 | ||
1149 | static int ds3231_clk_sqw_is_prepared(struct clk_hw *hw) | |
1150 | { | |
1151 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1152 | int control, ret; | |
1153 | ||
1154 | ret = regmap_read(ds1307->regmap, DS1337_REG_CONTROL, &control); | |
1155 | if (ret) | |
1156 | return ret; | |
1157 | ||
1158 | return !(control & DS1337_BIT_INTCN); | |
1159 | } | |
1160 | ||
1161 | static const struct clk_ops ds3231_clk_sqw_ops = { | |
1162 | .prepare = ds3231_clk_sqw_prepare, | |
1163 | .unprepare = ds3231_clk_sqw_unprepare, | |
1164 | .is_prepared = ds3231_clk_sqw_is_prepared, | |
1165 | .recalc_rate = ds3231_clk_sqw_recalc_rate, | |
1166 | .round_rate = ds3231_clk_sqw_round_rate, | |
1167 | .set_rate = ds3231_clk_sqw_set_rate, | |
1168 | }; | |
1169 | ||
1170 | static unsigned long ds3231_clk_32khz_recalc_rate(struct clk_hw *hw, | |
1171 | unsigned long parent_rate) | |
1172 | { | |
1173 | return 32768; | |
1174 | } | |
1175 | ||
1176 | static int ds3231_clk_32khz_control(struct ds1307 *ds1307, bool enable) | |
1177 | { | |
1178 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
1179 | int ret; | |
1180 | ||
1181 | mutex_lock(lock); | |
1182 | ret = regmap_update_bits(ds1307->regmap, DS1337_REG_STATUS, | |
1183 | DS3231_BIT_EN32KHZ, | |
1184 | enable ? DS3231_BIT_EN32KHZ : 0); | |
1185 | mutex_unlock(lock); | |
1186 | ||
1187 | return ret; | |
1188 | } | |
1189 | ||
1190 | static int ds3231_clk_32khz_prepare(struct clk_hw *hw) | |
1191 | { | |
1192 | struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw); | |
1193 | ||
1194 | return ds3231_clk_32khz_control(ds1307, true); | |
1195 | } | |
1196 | ||
1197 | static void ds3231_clk_32khz_unprepare(struct clk_hw *hw) | |
1198 | { | |
1199 | struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw); | |
1200 | ||
1201 | ds3231_clk_32khz_control(ds1307, false); | |
1202 | } | |
1203 | ||
1204 | static int ds3231_clk_32khz_is_prepared(struct clk_hw *hw) | |
1205 | { | |
1206 | struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw); | |
1207 | int status, ret; | |
1208 | ||
1209 | ret = regmap_read(ds1307->regmap, DS1337_REG_STATUS, &status); | |
1210 | if (ret) | |
1211 | return ret; | |
1212 | ||
1213 | return !!(status & DS3231_BIT_EN32KHZ); | |
1214 | } | |
1215 | ||
1216 | static const struct clk_ops ds3231_clk_32khz_ops = { | |
1217 | .prepare = ds3231_clk_32khz_prepare, | |
1218 | .unprepare = ds3231_clk_32khz_unprepare, | |
1219 | .is_prepared = ds3231_clk_32khz_is_prepared, | |
1220 | .recalc_rate = ds3231_clk_32khz_recalc_rate, | |
1221 | }; | |
1222 | ||
1223 | static struct clk_init_data ds3231_clks_init[] = { | |
1224 | [DS3231_CLK_SQW] = { | |
1225 | .name = "ds3231_clk_sqw", | |
1226 | .ops = &ds3231_clk_sqw_ops, | |
1227 | }, | |
1228 | [DS3231_CLK_32KHZ] = { | |
1229 | .name = "ds3231_clk_32khz", | |
1230 | .ops = &ds3231_clk_32khz_ops, | |
1231 | }, | |
1232 | }; | |
1233 | ||
1234 | static int ds3231_clks_register(struct ds1307 *ds1307) | |
1235 | { | |
1236 | struct device_node *node = ds1307->dev->of_node; | |
1237 | struct clk_onecell_data *onecell; | |
1238 | int i; | |
1239 | ||
1240 | onecell = devm_kzalloc(ds1307->dev, sizeof(*onecell), GFP_KERNEL); | |
1241 | if (!onecell) | |
1242 | return -ENOMEM; | |
1243 | ||
1244 | onecell->clk_num = ARRAY_SIZE(ds3231_clks_init); | |
1245 | onecell->clks = devm_kcalloc(ds1307->dev, onecell->clk_num, | |
1246 | sizeof(onecell->clks[0]), GFP_KERNEL); | |
1247 | if (!onecell->clks) | |
1248 | return -ENOMEM; | |
1249 | ||
1250 | for (i = 0; i < ARRAY_SIZE(ds3231_clks_init); i++) { | |
1251 | struct clk_init_data init = ds3231_clks_init[i]; | |
1252 | ||
1253 | /* | |
1254 | * Interrupt signal due to alarm conditions and square-wave | |
1255 | * output share same pin, so don't initialize both. | |
1256 | */ | |
1257 | if (i == DS3231_CLK_SQW && test_bit(HAS_ALARM, &ds1307->flags)) | |
1258 | continue; | |
1259 | ||
1260 | /* optional override of the clockname */ | |
1261 | of_property_read_string_index(node, "clock-output-names", i, | |
1262 | &init.name); | |
1263 | ds1307->clks[i].init = &init; | |
1264 | ||
1265 | onecell->clks[i] = devm_clk_register(ds1307->dev, | |
1266 | &ds1307->clks[i]); | |
1267 | if (IS_ERR(onecell->clks[i])) | |
1268 | return PTR_ERR(onecell->clks[i]); | |
1269 | } | |
1270 | ||
1271 | if (!node) | |
1272 | return 0; | |
1273 | ||
1274 | of_clk_add_provider(node, of_clk_src_onecell_get, onecell); | |
1275 | ||
1276 | return 0; | |
1277 | } | |
1278 | ||
1279 | static void ds1307_clks_register(struct ds1307 *ds1307) | |
1280 | { | |
1281 | int ret; | |
1282 | ||
1283 | if (ds1307->type != ds_3231) | |
1284 | return; | |
1285 | ||
1286 | ret = ds3231_clks_register(ds1307); | |
1287 | if (ret) { | |
1288 | dev_warn(ds1307->dev, "unable to register clock device %d\n", | |
1289 | ret); | |
1290 | } | |
1291 | } | |
1292 | ||
1293 | #else | |
1294 | ||
1295 | static void ds1307_clks_register(struct ds1307 *ds1307) | |
1296 | { | |
1297 | } | |
1298 | ||
1299 | #endif /* CONFIG_COMMON_CLK */ | |
1300 | ||
1301 | static const struct regmap_config regmap_config = { | |
1302 | .reg_bits = 8, | |
1303 | .val_bits = 8, | |
1304 | }; | |
1305 | ||
1306 | static int ds1307_probe(struct i2c_client *client, | |
1307 | const struct i2c_device_id *id) | |
1308 | { | |
1309 | struct ds1307 *ds1307; | |
1310 | int err = -ENODEV; | |
1311 | int tmp, wday; | |
1312 | struct chip_desc *chip; | |
1313 | bool want_irq = false; | |
1314 | bool ds1307_can_wakeup_device = false; | |
1315 | unsigned char *buf; | |
1316 | struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev); | |
1317 | struct rtc_time tm; | |
1318 | unsigned long timestamp; | |
1319 | ||
1320 | irq_handler_t irq_handler = ds1307_irq; | |
1321 | ||
1322 | static const int bbsqi_bitpos[] = { | |
1323 | [ds_1337] = 0, | |
1324 | [ds_1339] = DS1339_BIT_BBSQI, | |
1325 | [ds_3231] = DS3231_BIT_BBSQW, | |
1326 | }; | |
1327 | const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops; | |
1328 | ||
1329 | ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL); | |
1330 | if (!ds1307) | |
1331 | return -ENOMEM; | |
1332 | ||
1333 | dev_set_drvdata(&client->dev, ds1307); | |
1334 | ds1307->dev = &client->dev; | |
1335 | ds1307->name = client->name; | |
1336 | ds1307->irq = client->irq; | |
1337 | ||
1338 | ds1307->regmap = devm_regmap_init_i2c(client, ®map_config); | |
1339 | if (IS_ERR(ds1307->regmap)) { | |
1340 | dev_err(ds1307->dev, "regmap allocation failed\n"); | |
1341 | return PTR_ERR(ds1307->regmap); | |
1342 | } | |
1343 | ||
1344 | i2c_set_clientdata(client, ds1307); | |
1345 | ||
1346 | if (client->dev.of_node) { | |
1347 | ds1307->type = (enum ds_type) | |
1348 | of_device_get_match_data(&client->dev); | |
1349 | chip = &chips[ds1307->type]; | |
1350 | } else if (id) { | |
1351 | chip = &chips[id->driver_data]; | |
1352 | ds1307->type = id->driver_data; | |
1353 | } else { | |
1354 | const struct acpi_device_id *acpi_id; | |
1355 | ||
1356 | acpi_id = acpi_match_device(ACPI_PTR(ds1307_acpi_ids), | |
1357 | ds1307->dev); | |
1358 | if (!acpi_id) | |
1359 | return -ENODEV; | |
1360 | chip = &chips[acpi_id->driver_data]; | |
1361 | ds1307->type = acpi_id->driver_data; | |
1362 | } | |
1363 | ||
1364 | if (!pdata) | |
1365 | ds1307_trickle_init(ds1307, chip); | |
1366 | else if (pdata->trickle_charger_setup) | |
1367 | chip->trickle_charger_setup = pdata->trickle_charger_setup; | |
1368 | ||
1369 | if (chip->trickle_charger_setup && chip->trickle_charger_reg) { | |
1370 | dev_dbg(ds1307->dev, | |
1371 | "writing trickle charger info 0x%x to 0x%x\n", | |
1372 | DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup, | |
1373 | chip->trickle_charger_reg); | |
1374 | regmap_write(ds1307->regmap, chip->trickle_charger_reg, | |
1375 | DS13XX_TRICKLE_CHARGER_MAGIC | | |
1376 | chip->trickle_charger_setup); | |
1377 | } | |
1378 | ||
1379 | buf = ds1307->regs; | |
1380 | ||
1381 | #ifdef CONFIG_OF | |
1382 | /* | |
1383 | * For devices with no IRQ directly connected to the SoC, the RTC chip | |
1384 | * can be forced as a wakeup source by stating that explicitly in | |
1385 | * the device's .dts file using the "wakeup-source" boolean property. | |
1386 | * If the "wakeup-source" property is set, don't request an IRQ. | |
1387 | * This will guarantee the 'wakealarm' sysfs entry is available on the device, | |
1388 | * if supported by the RTC. | |
1389 | */ | |
1390 | if (of_property_read_bool(client->dev.of_node, "wakeup-source")) { | |
1391 | ds1307_can_wakeup_device = true; | |
1392 | } | |
1393 | /* Intersil ISL12057 DT backward compatibility */ | |
1394 | if (of_property_read_bool(client->dev.of_node, | |
1395 | "isil,irq2-can-wakeup-machine")) { | |
1396 | ds1307_can_wakeup_device = true; | |
1397 | } | |
1398 | #endif | |
1399 | ||
1400 | switch (ds1307->type) { | |
1401 | case ds_1337: | |
1402 | case ds_1339: | |
1403 | case ds_3231: | |
1404 | /* get registers that the "rtc" read below won't read... */ | |
1405 | err = regmap_bulk_read(ds1307->regmap, DS1337_REG_CONTROL, | |
1406 | buf, 2); | |
1407 | if (err) { | |
1408 | dev_dbg(ds1307->dev, "read error %d\n", err); | |
1409 | goto exit; | |
1410 | } | |
1411 | ||
1412 | /* oscillator off? turn it on, so clock can tick. */ | |
1413 | if (ds1307->regs[0] & DS1337_BIT_nEOSC) | |
1414 | ds1307->regs[0] &= ~DS1337_BIT_nEOSC; | |
1415 | ||
1416 | /* | |
1417 | * Using IRQ or defined as wakeup-source? | |
1418 | * Disable the square wave and both alarms. | |
1419 | * For some variants, be sure alarms can trigger when we're | |
1420 | * running on Vbackup (BBSQI/BBSQW) | |
1421 | */ | |
1422 | if (chip->alarm && (ds1307->irq > 0 || | |
1423 | ds1307_can_wakeup_device)) { | |
1424 | ds1307->regs[0] |= DS1337_BIT_INTCN | |
1425 | | bbsqi_bitpos[ds1307->type]; | |
1426 | ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE); | |
1427 | ||
1428 | want_irq = true; | |
1429 | } | |
1430 | ||
1431 | regmap_write(ds1307->regmap, DS1337_REG_CONTROL, | |
1432 | ds1307->regs[0]); | |
1433 | ||
1434 | /* oscillator fault? clear flag, and warn */ | |
1435 | if (ds1307->regs[1] & DS1337_BIT_OSF) { | |
1436 | regmap_write(ds1307->regmap, DS1337_REG_STATUS, | |
1437 | ds1307->regs[1] & ~DS1337_BIT_OSF); | |
1438 | dev_warn(ds1307->dev, "SET TIME!\n"); | |
1439 | } | |
1440 | break; | |
1441 | ||
1442 | case rx_8025: | |
1443 | err = regmap_bulk_read(ds1307->regmap, | |
1444 | RX8025_REG_CTRL1 << 4 | 0x08, buf, 2); | |
1445 | if (err) { | |
1446 | dev_dbg(ds1307->dev, "read error %d\n", err); | |
1447 | goto exit; | |
1448 | } | |
1449 | ||
1450 | /* oscillator off? turn it on, so clock can tick. */ | |
1451 | if (!(ds1307->regs[1] & RX8025_BIT_XST)) { | |
1452 | ds1307->regs[1] |= RX8025_BIT_XST; | |
1453 | regmap_write(ds1307->regmap, | |
1454 | RX8025_REG_CTRL2 << 4 | 0x08, | |
1455 | ds1307->regs[1]); | |
1456 | dev_warn(ds1307->dev, | |
1457 | "oscillator stop detected - SET TIME!\n"); | |
1458 | } | |
1459 | ||
1460 | if (ds1307->regs[1] & RX8025_BIT_PON) { | |
1461 | ds1307->regs[1] &= ~RX8025_BIT_PON; | |
1462 | regmap_write(ds1307->regmap, | |
1463 | RX8025_REG_CTRL2 << 4 | 0x08, | |
1464 | ds1307->regs[1]); | |
1465 | dev_warn(ds1307->dev, "power-on detected\n"); | |
1466 | } | |
1467 | ||
1468 | if (ds1307->regs[1] & RX8025_BIT_VDET) { | |
1469 | ds1307->regs[1] &= ~RX8025_BIT_VDET; | |
1470 | regmap_write(ds1307->regmap, | |
1471 | RX8025_REG_CTRL2 << 4 | 0x08, | |
1472 | ds1307->regs[1]); | |
1473 | dev_warn(ds1307->dev, "voltage drop detected\n"); | |
1474 | } | |
1475 | ||
1476 | /* make sure we are running in 24hour mode */ | |
1477 | if (!(ds1307->regs[0] & RX8025_BIT_2412)) { | |
1478 | u8 hour; | |
1479 | ||
1480 | /* switch to 24 hour mode */ | |
1481 | regmap_write(ds1307->regmap, | |
1482 | RX8025_REG_CTRL1 << 4 | 0x08, | |
1483 | ds1307->regs[0] | RX8025_BIT_2412); | |
1484 | ||
1485 | err = regmap_bulk_read(ds1307->regmap, | |
1486 | RX8025_REG_CTRL1 << 4 | 0x08, | |
1487 | buf, 2); | |
1488 | if (err) { | |
1489 | dev_dbg(ds1307->dev, "read error %d\n", err); | |
1490 | goto exit; | |
1491 | } | |
1492 | ||
1493 | /* correct hour */ | |
1494 | hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]); | |
1495 | if (hour == 12) | |
1496 | hour = 0; | |
1497 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) | |
1498 | hour += 12; | |
1499 | ||
1500 | regmap_write(ds1307->regmap, | |
1501 | DS1307_REG_HOUR << 4 | 0x08, hour); | |
1502 | } | |
1503 | break; | |
1504 | case rx_8130: | |
1505 | ds1307->offset = 0x10; /* Seconds starts at 0x10 */ | |
1506 | rtc_ops = &rx8130_rtc_ops; | |
1507 | if (chip->alarm && ds1307->irq > 0) { | |
1508 | irq_handler = rx8130_irq; | |
1509 | want_irq = true; | |
1510 | } | |
1511 | break; | |
1512 | case ds_1388: | |
1513 | ds1307->offset = 1; /* Seconds starts at 1 */ | |
1514 | break; | |
1515 | case mcp794xx: | |
1516 | rtc_ops = &mcp794xx_rtc_ops; | |
1517 | if (chip->alarm && (ds1307->irq > 0 || | |
1518 | ds1307_can_wakeup_device)) { | |
1519 | irq_handler = mcp794xx_irq; | |
1520 | want_irq = true; | |
1521 | } | |
1522 | break; | |
1523 | default: | |
1524 | break; | |
1525 | } | |
1526 | ||
1527 | read_rtc: | |
1528 | /* read RTC registers */ | |
1529 | err = regmap_bulk_read(ds1307->regmap, ds1307->offset, buf, 8); | |
1530 | if (err) { | |
1531 | dev_dbg(ds1307->dev, "read error %d\n", err); | |
1532 | goto exit; | |
1533 | } | |
1534 | ||
1535 | /* | |
1536 | * minimal sanity checking; some chips (like DS1340) don't | |
1537 | * specify the extra bits as must-be-zero, but there are | |
1538 | * still a few values that are clearly out-of-range. | |
1539 | */ | |
1540 | tmp = ds1307->regs[DS1307_REG_SECS]; | |
1541 | switch (ds1307->type) { | |
1542 | case ds_1307: | |
1543 | case m41t0: | |
1544 | case m41t00: | |
1545 | /* clock halted? turn it on, so clock can tick. */ | |
1546 | if (tmp & DS1307_BIT_CH) { | |
1547 | regmap_write(ds1307->regmap, DS1307_REG_SECS, 0); | |
1548 | dev_warn(ds1307->dev, "SET TIME!\n"); | |
1549 | goto read_rtc; | |
1550 | } | |
1551 | break; | |
1552 | case ds_1308: | |
1553 | case ds_1338: | |
1554 | /* clock halted? turn it on, so clock can tick. */ | |
1555 | if (tmp & DS1307_BIT_CH) | |
1556 | regmap_write(ds1307->regmap, DS1307_REG_SECS, 0); | |
1557 | ||
1558 | /* oscillator fault? clear flag, and warn */ | |
1559 | if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) { | |
1560 | regmap_write(ds1307->regmap, DS1307_REG_CONTROL, | |
1561 | ds1307->regs[DS1307_REG_CONTROL] & | |
1562 | ~DS1338_BIT_OSF); | |
1563 | dev_warn(ds1307->dev, "SET TIME!\n"); | |
1564 | goto read_rtc; | |
1565 | } | |
1566 | break; | |
1567 | case ds_1340: | |
1568 | /* clock halted? turn it on, so clock can tick. */ | |
1569 | if (tmp & DS1340_BIT_nEOSC) | |
1570 | regmap_write(ds1307->regmap, DS1307_REG_SECS, 0); | |
1571 | ||
1572 | err = regmap_read(ds1307->regmap, DS1340_REG_FLAG, &tmp); | |
1573 | if (err) { | |
1574 | dev_dbg(ds1307->dev, "read error %d\n", err); | |
1575 | goto exit; | |
1576 | } | |
1577 | ||
1578 | /* oscillator fault? clear flag, and warn */ | |
1579 | if (tmp & DS1340_BIT_OSF) { | |
1580 | regmap_write(ds1307->regmap, DS1340_REG_FLAG, 0); | |
1581 | dev_warn(ds1307->dev, "SET TIME!\n"); | |
1582 | } | |
1583 | break; | |
1584 | case mcp794xx: | |
1585 | /* make sure that the backup battery is enabled */ | |
1586 | if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) { | |
1587 | regmap_write(ds1307->regmap, DS1307_REG_WDAY, | |
1588 | ds1307->regs[DS1307_REG_WDAY] | | |
1589 | MCP794XX_BIT_VBATEN); | |
1590 | } | |
1591 | ||
1592 | /* clock halted? turn it on, so clock can tick. */ | |
1593 | if (!(tmp & MCP794XX_BIT_ST)) { | |
1594 | regmap_write(ds1307->regmap, DS1307_REG_SECS, | |
1595 | MCP794XX_BIT_ST); | |
1596 | dev_warn(ds1307->dev, "SET TIME!\n"); | |
1597 | goto read_rtc; | |
1598 | } | |
1599 | ||
1600 | break; | |
1601 | default: | |
1602 | break; | |
1603 | } | |
1604 | ||
1605 | tmp = ds1307->regs[DS1307_REG_HOUR]; | |
1606 | switch (ds1307->type) { | |
1607 | case ds_1340: | |
1608 | case m41t0: | |
1609 | case m41t00: | |
1610 | /* | |
1611 | * NOTE: ignores century bits; fix before deploying | |
1612 | * systems that will run through year 2100. | |
1613 | */ | |
1614 | break; | |
1615 | case rx_8025: | |
1616 | break; | |
1617 | default: | |
1618 | if (!(tmp & DS1307_BIT_12HR)) | |
1619 | break; | |
1620 | ||
1621 | /* | |
1622 | * Be sure we're in 24 hour mode. Multi-master systems | |
1623 | * take note... | |
1624 | */ | |
1625 | tmp = bcd2bin(tmp & 0x1f); | |
1626 | if (tmp == 12) | |
1627 | tmp = 0; | |
1628 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) | |
1629 | tmp += 12; | |
1630 | regmap_write(ds1307->regmap, ds1307->offset + DS1307_REG_HOUR, | |
1631 | bin2bcd(tmp)); | |
1632 | } | |
1633 | ||
1634 | /* | |
1635 | * Some IPs have weekday reset value = 0x1 which might not correct | |
1636 | * hence compute the wday using the current date/month/year values | |
1637 | */ | |
1638 | ds1307_get_time(ds1307->dev, &tm); | |
1639 | wday = tm.tm_wday; | |
1640 | timestamp = rtc_tm_to_time64(&tm); | |
1641 | rtc_time64_to_tm(timestamp, &tm); | |
1642 | ||
1643 | /* | |
1644 | * Check if reset wday is different from the computed wday | |
1645 | * If different then set the wday which we computed using | |
1646 | * timestamp | |
1647 | */ | |
1648 | if (wday != tm.tm_wday) | |
1649 | regmap_update_bits(ds1307->regmap, MCP794XX_REG_WEEKDAY, | |
1650 | MCP794XX_REG_WEEKDAY_WDAY_MASK, | |
1651 | tm.tm_wday + 1); | |
1652 | ||
1653 | if (want_irq) { | |
1654 | device_set_wakeup_capable(ds1307->dev, true); | |
1655 | set_bit(HAS_ALARM, &ds1307->flags); | |
1656 | } | |
1657 | ||
1658 | ds1307->rtc = devm_rtc_allocate_device(ds1307->dev); | |
1659 | if (IS_ERR(ds1307->rtc)) { | |
1660 | return PTR_ERR(ds1307->rtc); | |
1661 | } | |
1662 | ||
1663 | if (ds1307_can_wakeup_device && ds1307->irq <= 0) { | |
1664 | /* Disable request for an IRQ */ | |
1665 | want_irq = false; | |
1666 | dev_info(ds1307->dev, | |
1667 | "'wakeup-source' is set, request for an IRQ is disabled!\n"); | |
1668 | /* We cannot support UIE mode if we do not have an IRQ line */ | |
1669 | ds1307->rtc->uie_unsupported = 1; | |
1670 | } | |
1671 | ||
1672 | if (want_irq) { | |
1673 | err = devm_request_threaded_irq(ds1307->dev, | |
1674 | ds1307->irq, NULL, irq_handler, | |
1675 | IRQF_SHARED | IRQF_ONESHOT, | |
1676 | ds1307->name, ds1307); | |
1677 | if (err) { | |
1678 | client->irq = 0; | |
1679 | device_set_wakeup_capable(ds1307->dev, false); | |
1680 | clear_bit(HAS_ALARM, &ds1307->flags); | |
1681 | dev_err(ds1307->dev, "unable to request IRQ!\n"); | |
1682 | } else | |
1683 | dev_dbg(ds1307->dev, "got IRQ %d\n", client->irq); | |
1684 | } | |
1685 | ||
1686 | if (chip->nvram_size) { | |
1687 | ds1307->nvmem_cfg.name = "ds1307_nvram"; | |
1688 | ds1307->nvmem_cfg.word_size = 1; | |
1689 | ds1307->nvmem_cfg.stride = 1; | |
1690 | ds1307->nvmem_cfg.size = chip->nvram_size; | |
1691 | ds1307->nvmem_cfg.reg_read = ds1307_nvram_read; | |
1692 | ds1307->nvmem_cfg.reg_write = ds1307_nvram_write; | |
1693 | ds1307->nvmem_cfg.priv = ds1307; | |
1694 | ds1307->nvram_offset = chip->nvram_offset; | |
1695 | ||
1696 | ds1307->rtc->nvmem_config = &ds1307->nvmem_cfg; | |
1697 | ds1307->rtc->nvram_old_abi = true; | |
1698 | } | |
1699 | ||
1700 | ds1307->rtc->ops = rtc_ops; | |
1701 | err = rtc_register_device(ds1307->rtc); | |
1702 | if (err) | |
1703 | return err; | |
1704 | ||
1705 | ds1307_hwmon_register(ds1307); | |
1706 | ds1307_clks_register(ds1307); | |
1707 | ||
1708 | return 0; | |
1709 | ||
1710 | exit: | |
1711 | return err; | |
1712 | } | |
1713 | ||
1714 | static struct i2c_driver ds1307_driver = { | |
1715 | .driver = { | |
1716 | .name = "rtc-ds1307", | |
1717 | .of_match_table = of_match_ptr(ds1307_of_match), | |
1718 | .acpi_match_table = ACPI_PTR(ds1307_acpi_ids), | |
1719 | }, | |
1720 | .probe = ds1307_probe, | |
1721 | .id_table = ds1307_id, | |
1722 | }; | |
1723 | ||
1724 | module_i2c_driver(ds1307_driver); | |
1725 | ||
1726 | MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips"); | |
1727 | MODULE_LICENSE("GPL"); |