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13#include <linux/bcd.h>
14#include <linux/i2c.h>
15#include <linux/module.h>
16#include <linux/rtc.h>
17#include <linux/watchdog.h>
18
19#define ABX8XX_REG_HTH 0x00
20#define ABX8XX_REG_SC 0x01
21#define ABX8XX_REG_MN 0x02
22#define ABX8XX_REG_HR 0x03
23#define ABX8XX_REG_DA 0x04
24#define ABX8XX_REG_MO 0x05
25#define ABX8XX_REG_YR 0x06
26#define ABX8XX_REG_WD 0x07
27
28#define ABX8XX_REG_AHTH 0x08
29#define ABX8XX_REG_ASC 0x09
30#define ABX8XX_REG_AMN 0x0a
31#define ABX8XX_REG_AHR 0x0b
32#define ABX8XX_REG_ADA 0x0c
33#define ABX8XX_REG_AMO 0x0d
34#define ABX8XX_REG_AWD 0x0e
35
36#define ABX8XX_REG_STATUS 0x0f
37#define ABX8XX_STATUS_AF BIT(2)
38#define ABX8XX_STATUS_BLF BIT(4)
39#define ABX8XX_STATUS_WDT BIT(6)
40
41#define ABX8XX_REG_CTRL1 0x10
42#define ABX8XX_CTRL_WRITE BIT(0)
43#define ABX8XX_CTRL_ARST BIT(2)
44#define ABX8XX_CTRL_12_24 BIT(6)
45
46#define ABX8XX_REG_CTRL2 0x11
47#define ABX8XX_CTRL2_RSVD BIT(5)
48
49#define ABX8XX_REG_IRQ 0x12
50#define ABX8XX_IRQ_AIE BIT(2)
51#define ABX8XX_IRQ_IM_1_4 (0x3 << 5)
52
53#define ABX8XX_REG_CD_TIMER_CTL 0x18
54
55#define ABX8XX_REG_OSC 0x1c
56#define ABX8XX_OSC_FOS BIT(3)
57#define ABX8XX_OSC_BOS BIT(4)
58#define ABX8XX_OSC_ACAL_512 BIT(5)
59#define ABX8XX_OSC_ACAL_1024 BIT(6)
60
61#define ABX8XX_OSC_OSEL BIT(7)
62
63#define ABX8XX_REG_OSS 0x1d
64#define ABX8XX_OSS_OF BIT(1)
65#define ABX8XX_OSS_OMODE BIT(4)
66
67#define ABX8XX_REG_WDT 0x1b
68#define ABX8XX_WDT_WDS BIT(7)
69#define ABX8XX_WDT_BMB_MASK 0x7c
70#define ABX8XX_WDT_BMB_SHIFT 2
71#define ABX8XX_WDT_MAX_TIME (ABX8XX_WDT_BMB_MASK >> ABX8XX_WDT_BMB_SHIFT)
72#define ABX8XX_WDT_WRB_MASK 0x03
73#define ABX8XX_WDT_WRB_1HZ 0x02
74
75#define ABX8XX_REG_CFG_KEY 0x1f
76#define ABX8XX_CFG_KEY_OSC 0xa1
77#define ABX8XX_CFG_KEY_MISC 0x9d
78
79#define ABX8XX_REG_ID0 0x28
80
81#define ABX8XX_REG_OUT_CTRL 0x30
82#define ABX8XX_OUT_CTRL_EXDS BIT(4)
83
84#define ABX8XX_REG_TRICKLE 0x20
85#define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0
86#define ABX8XX_TRICKLE_STANDARD_DIODE 0x8
87#define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4
88
89static u8 trickle_resistors[] = {0, 3, 6, 11};
90
91enum abx80x_chip {AB0801, AB0803, AB0804, AB0805,
92 AB1801, AB1803, AB1804, AB1805, RV1805, ABX80X};
93
94struct abx80x_cap {
95 u16 pn;
96 bool has_tc;
97 bool has_wdog;
98};
99
100static struct abx80x_cap abx80x_caps[] = {
101 [AB0801] = {.pn = 0x0801},
102 [AB0803] = {.pn = 0x0803},
103 [AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true},
104 [AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true},
105 [AB1801] = {.pn = 0x1801},
106 [AB1803] = {.pn = 0x1803},
107 [AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true},
108 [AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
109 [RV1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true},
110 [ABX80X] = {.pn = 0}
111};
112
113struct abx80x_priv {
114 struct rtc_device *rtc;
115 struct i2c_client *client;
116 struct watchdog_device wdog;
117};
118
119static int abx80x_is_rc_mode(struct i2c_client *client)
120{
121 int flags = 0;
122
123 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
124 if (flags < 0) {
125 dev_err(&client->dev,
126 "Failed to read autocalibration attribute\n");
127 return flags;
128 }
129
130 return (flags & ABX8XX_OSS_OMODE) ? 1 : 0;
131}
132
133static int abx80x_enable_trickle_charger(struct i2c_client *client,
134 u8 trickle_cfg)
135{
136 int err;
137
138
139
140
141
142 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
143 ABX8XX_CFG_KEY_MISC);
144 if (err < 0) {
145 dev_err(&client->dev, "Unable to write configuration key\n");
146 return -EIO;
147 }
148
149 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE,
150 ABX8XX_TRICKLE_CHARGE_ENABLE |
151 trickle_cfg);
152 if (err < 0) {
153 dev_err(&client->dev, "Unable to write trickle register\n");
154 return -EIO;
155 }
156
157 return 0;
158}
159
160static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
161{
162 struct i2c_client *client = to_i2c_client(dev);
163 unsigned char buf[8];
164 int err, flags, rc_mode = 0;
165
166
167 rc_mode = abx80x_is_rc_mode(client);
168 if (rc_mode < 0)
169 return rc_mode;
170
171 if (!rc_mode) {
172 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
173 if (flags < 0)
174 return flags;
175
176 if (flags & ABX8XX_OSS_OF) {
177 dev_err(dev, "Oscillator failure, data is invalid.\n");
178 return -EINVAL;
179 }
180 }
181
182 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH,
183 sizeof(buf), buf);
184 if (err < 0) {
185 dev_err(&client->dev, "Unable to read date\n");
186 return -EIO;
187 }
188
189 tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F);
190 tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F);
191 tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F);
192 tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7;
193 tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F);
194 tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1;
195 tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100;
196
197 return 0;
198}
199
200static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
201{
202 struct i2c_client *client = to_i2c_client(dev);
203 unsigned char buf[8];
204 int err, flags;
205
206 if (tm->tm_year < 100)
207 return -EINVAL;
208
209 buf[ABX8XX_REG_HTH] = 0;
210 buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec);
211 buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min);
212 buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour);
213 buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday);
214 buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1);
215 buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100);
216 buf[ABX8XX_REG_WD] = tm->tm_wday;
217
218 err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH,
219 sizeof(buf), buf);
220 if (err < 0) {
221 dev_err(&client->dev, "Unable to write to date registers\n");
222 return -EIO;
223 }
224
225
226 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS);
227 if (flags < 0)
228 return flags;
229
230 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS,
231 flags & ~ABX8XX_OSS_OF);
232 if (err < 0) {
233 dev_err(&client->dev, "Unable to write oscillator status register\n");
234 return err;
235 }
236
237 return 0;
238}
239
240static irqreturn_t abx80x_handle_irq(int irq, void *dev_id)
241{
242 struct i2c_client *client = dev_id;
243 struct abx80x_priv *priv = i2c_get_clientdata(client);
244 struct rtc_device *rtc = priv->rtc;
245 int status;
246
247 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
248 if (status < 0)
249 return IRQ_NONE;
250
251 if (status & ABX8XX_STATUS_AF)
252 rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
253
254
255
256
257
258 if (status & ABX8XX_STATUS_WDT)
259 dev_alert(&client->dev, "watchdog timeout interrupt.\n");
260
261 i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
262
263 return IRQ_HANDLED;
264}
265
266static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t)
267{
268 struct i2c_client *client = to_i2c_client(dev);
269 unsigned char buf[7];
270
271 int irq_mask, err;
272
273 if (client->irq <= 0)
274 return -EINVAL;
275
276 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC,
277 sizeof(buf), buf);
278 if (err)
279 return err;
280
281 irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ);
282 if (irq_mask < 0)
283 return irq_mask;
284
285 t->time.tm_sec = bcd2bin(buf[0] & 0x7F);
286 t->time.tm_min = bcd2bin(buf[1] & 0x7F);
287 t->time.tm_hour = bcd2bin(buf[2] & 0x3F);
288 t->time.tm_mday = bcd2bin(buf[3] & 0x3F);
289 t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1;
290 t->time.tm_wday = buf[5] & 0x7;
291
292 t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE);
293 t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled;
294
295 return err;
296}
297
298static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t)
299{
300 struct i2c_client *client = to_i2c_client(dev);
301 u8 alarm[6];
302 int err;
303
304 if (client->irq <= 0)
305 return -EINVAL;
306
307 alarm[0] = 0x0;
308 alarm[1] = bin2bcd(t->time.tm_sec);
309 alarm[2] = bin2bcd(t->time.tm_min);
310 alarm[3] = bin2bcd(t->time.tm_hour);
311 alarm[4] = bin2bcd(t->time.tm_mday);
312 alarm[5] = bin2bcd(t->time.tm_mon + 1);
313
314 err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH,
315 sizeof(alarm), alarm);
316 if (err < 0) {
317 dev_err(&client->dev, "Unable to write alarm registers\n");
318 return -EIO;
319 }
320
321 if (t->enabled) {
322 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
323 (ABX8XX_IRQ_IM_1_4 |
324 ABX8XX_IRQ_AIE));
325 if (err)
326 return err;
327 }
328
329 return 0;
330}
331
332static int abx80x_rtc_set_autocalibration(struct device *dev,
333 int autocalibration)
334{
335 struct i2c_client *client = to_i2c_client(dev);
336 int retval, flags = 0;
337
338 if ((autocalibration != 0) && (autocalibration != 1024) &&
339 (autocalibration != 512)) {
340 dev_err(dev, "autocalibration value outside permitted range\n");
341 return -EINVAL;
342 }
343
344 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
345 if (flags < 0)
346 return flags;
347
348 if (autocalibration == 0) {
349 flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024);
350 } else if (autocalibration == 1024) {
351
352 flags |= ABX8XX_OSC_ACAL_1024;
353 flags &= ~(ABX8XX_OSC_ACAL_512);
354 } else {
355
356 flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512);
357 }
358
359
360 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
361 ABX8XX_CFG_KEY_OSC);
362 if (retval < 0) {
363 dev_err(dev, "Failed to write CONFIG_KEY register\n");
364 return retval;
365 }
366
367 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
368
369 return retval;
370}
371
372static int abx80x_rtc_get_autocalibration(struct device *dev)
373{
374 struct i2c_client *client = to_i2c_client(dev);
375 int flags = 0, autocalibration;
376
377 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
378 if (flags < 0)
379 return flags;
380
381 if (flags & ABX8XX_OSC_ACAL_512)
382 autocalibration = 512;
383 else if (flags & ABX8XX_OSC_ACAL_1024)
384 autocalibration = 1024;
385 else
386 autocalibration = 0;
387
388 return autocalibration;
389}
390
391static ssize_t autocalibration_store(struct device *dev,
392 struct device_attribute *attr,
393 const char *buf, size_t count)
394{
395 int retval;
396 unsigned long autocalibration = 0;
397
398 retval = kstrtoul(buf, 10, &autocalibration);
399 if (retval < 0) {
400 dev_err(dev, "Failed to store RTC autocalibration attribute\n");
401 return -EINVAL;
402 }
403
404 retval = abx80x_rtc_set_autocalibration(dev->parent, autocalibration);
405
406 return retval ? retval : count;
407}
408
409static ssize_t autocalibration_show(struct device *dev,
410 struct device_attribute *attr, char *buf)
411{
412 int autocalibration = 0;
413
414 autocalibration = abx80x_rtc_get_autocalibration(dev->parent);
415 if (autocalibration < 0) {
416 dev_err(dev, "Failed to read RTC autocalibration\n");
417 sprintf(buf, "0\n");
418 return autocalibration;
419 }
420
421 return sprintf(buf, "%d\n", autocalibration);
422}
423
424static DEVICE_ATTR_RW(autocalibration);
425
426static ssize_t oscillator_store(struct device *dev,
427 struct device_attribute *attr,
428 const char *buf, size_t count)
429{
430 struct i2c_client *client = to_i2c_client(dev->parent);
431 int retval, flags, rc_mode = 0;
432
433 if (strncmp(buf, "rc", 2) == 0) {
434 rc_mode = 1;
435 } else if (strncmp(buf, "xtal", 4) == 0) {
436 rc_mode = 0;
437 } else {
438 dev_err(dev, "Oscillator selection value outside permitted ones\n");
439 return -EINVAL;
440 }
441
442 flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC);
443 if (flags < 0)
444 return flags;
445
446 if (rc_mode == 0)
447 flags &= ~(ABX8XX_OSC_OSEL);
448 else
449 flags |= (ABX8XX_OSC_OSEL);
450
451
452 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
453 ABX8XX_CFG_KEY_OSC);
454 if (retval < 0) {
455 dev_err(dev, "Failed to write CONFIG_KEY register\n");
456 return retval;
457 }
458
459 retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags);
460 if (retval < 0) {
461 dev_err(dev, "Failed to write Oscillator Control register\n");
462 return retval;
463 }
464
465 return retval ? retval : count;
466}
467
468static ssize_t oscillator_show(struct device *dev,
469 struct device_attribute *attr, char *buf)
470{
471 int rc_mode = 0;
472 struct i2c_client *client = to_i2c_client(dev->parent);
473
474 rc_mode = abx80x_is_rc_mode(client);
475
476 if (rc_mode < 0) {
477 dev_err(dev, "Failed to read RTC oscillator selection\n");
478 sprintf(buf, "\n");
479 return rc_mode;
480 }
481
482 if (rc_mode)
483 return sprintf(buf, "rc\n");
484 else
485 return sprintf(buf, "xtal\n");
486}
487
488static DEVICE_ATTR_RW(oscillator);
489
490static struct attribute *rtc_calib_attrs[] = {
491 &dev_attr_autocalibration.attr,
492 &dev_attr_oscillator.attr,
493 NULL,
494};
495
496static const struct attribute_group rtc_calib_attr_group = {
497 .attrs = rtc_calib_attrs,
498};
499
500static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled)
501{
502 struct i2c_client *client = to_i2c_client(dev);
503 int err;
504
505 if (enabled)
506 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
507 (ABX8XX_IRQ_IM_1_4 |
508 ABX8XX_IRQ_AIE));
509 else
510 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ,
511 ABX8XX_IRQ_IM_1_4);
512 return err;
513}
514
515static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
516{
517 struct i2c_client *client = to_i2c_client(dev);
518 int status, tmp;
519
520 switch (cmd) {
521 case RTC_VL_READ:
522 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
523 if (status < 0)
524 return status;
525
526 tmp = status & ABX8XX_STATUS_BLF ? RTC_VL_BACKUP_LOW : 0;
527
528 return put_user(tmp, (unsigned int __user *)arg);
529
530 case RTC_VL_CLR:
531 status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS);
532 if (status < 0)
533 return status;
534
535 status &= ~ABX8XX_STATUS_BLF;
536
537 tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0);
538 if (tmp < 0)
539 return tmp;
540
541 return 0;
542
543 default:
544 return -ENOIOCTLCMD;
545 }
546}
547
548static const struct rtc_class_ops abx80x_rtc_ops = {
549 .read_time = abx80x_rtc_read_time,
550 .set_time = abx80x_rtc_set_time,
551 .read_alarm = abx80x_read_alarm,
552 .set_alarm = abx80x_set_alarm,
553 .alarm_irq_enable = abx80x_alarm_irq_enable,
554 .ioctl = abx80x_ioctl,
555};
556
557static int abx80x_dt_trickle_cfg(struct device_node *np)
558{
559 const char *diode;
560 int trickle_cfg = 0;
561 int i, ret;
562 u32 tmp;
563
564 ret = of_property_read_string(np, "abracon,tc-diode", &diode);
565 if (ret)
566 return ret;
567
568 if (!strcmp(diode, "standard"))
569 trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE;
570 else if (!strcmp(diode, "schottky"))
571 trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE;
572 else
573 return -EINVAL;
574
575 ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp);
576 if (ret)
577 return ret;
578
579 for (i = 0; i < sizeof(trickle_resistors); i++)
580 if (trickle_resistors[i] == tmp)
581 break;
582
583 if (i == sizeof(trickle_resistors))
584 return -EINVAL;
585
586 return (trickle_cfg | i);
587}
588
589#ifdef CONFIG_WATCHDOG
590
591static inline u8 timeout_bits(unsigned int timeout)
592{
593 return ((timeout << ABX8XX_WDT_BMB_SHIFT) & ABX8XX_WDT_BMB_MASK) |
594 ABX8XX_WDT_WRB_1HZ;
595}
596
597static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog,
598 unsigned int timeout)
599{
600 struct abx80x_priv *priv = watchdog_get_drvdata(wdog);
601 u8 val = ABX8XX_WDT_WDS | timeout_bits(timeout);
602
603
604
605
606
607 return i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_WDT, val);
608}
609
610static int abx80x_wdog_set_timeout(struct watchdog_device *wdog,
611 unsigned int new_timeout)
612{
613 int err = 0;
614
615 if (watchdog_hw_running(wdog))
616 err = __abx80x_wdog_set_timeout(wdog, new_timeout);
617
618 if (err == 0)
619 wdog->timeout = new_timeout;
620
621 return err;
622}
623
624static int abx80x_wdog_ping(struct watchdog_device *wdog)
625{
626 return __abx80x_wdog_set_timeout(wdog, wdog->timeout);
627}
628
629static int abx80x_wdog_start(struct watchdog_device *wdog)
630{
631 return __abx80x_wdog_set_timeout(wdog, wdog->timeout);
632}
633
634static int abx80x_wdog_stop(struct watchdog_device *wdog)
635{
636 return __abx80x_wdog_set_timeout(wdog, 0);
637}
638
639static const struct watchdog_info abx80x_wdog_info = {
640 .identity = "abx80x watchdog",
641 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
642};
643
644static const struct watchdog_ops abx80x_wdog_ops = {
645 .owner = THIS_MODULE,
646 .start = abx80x_wdog_start,
647 .stop = abx80x_wdog_stop,
648 .ping = abx80x_wdog_ping,
649 .set_timeout = abx80x_wdog_set_timeout,
650};
651
652static int abx80x_setup_watchdog(struct abx80x_priv *priv)
653{
654 priv->wdog.parent = &priv->client->dev;
655 priv->wdog.ops = &abx80x_wdog_ops;
656 priv->wdog.info = &abx80x_wdog_info;
657 priv->wdog.min_timeout = 1;
658 priv->wdog.max_timeout = ABX8XX_WDT_MAX_TIME;
659 priv->wdog.timeout = ABX8XX_WDT_MAX_TIME;
660
661 watchdog_set_drvdata(&priv->wdog, priv);
662
663 return devm_watchdog_register_device(&priv->client->dev, &priv->wdog);
664}
665#else
666static int abx80x_setup_watchdog(struct abx80x_priv *priv)
667{
668 return 0;
669}
670#endif
671
672static int abx80x_probe(struct i2c_client *client,
673 const struct i2c_device_id *id)
674{
675 struct device_node *np = client->dev.of_node;
676 struct abx80x_priv *priv;
677 int i, data, err, trickle_cfg = -EINVAL;
678 char buf[7];
679 unsigned int part = id->driver_data;
680 unsigned int partnumber;
681 unsigned int majrev, minrev;
682 unsigned int lot;
683 unsigned int wafer;
684 unsigned int uid;
685
686 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
687 return -ENODEV;
688
689 err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0,
690 sizeof(buf), buf);
691 if (err < 0) {
692 dev_err(&client->dev, "Unable to read partnumber\n");
693 return -EIO;
694 }
695
696 partnumber = (buf[0] << 8) | buf[1];
697 majrev = buf[2] >> 3;
698 minrev = buf[2] & 0x7;
699 lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3];
700 uid = ((buf[4] & 0x7f) << 8) | buf[5];
701 wafer = (buf[6] & 0x7c) >> 2;
702 dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n",
703 partnumber, majrev, minrev, lot, wafer, uid);
704
705 data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1);
706 if (data < 0) {
707 dev_err(&client->dev, "Unable to read control register\n");
708 return -EIO;
709 }
710
711 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1,
712 ((data & ~(ABX8XX_CTRL_12_24 |
713 ABX8XX_CTRL_ARST)) |
714 ABX8XX_CTRL_WRITE));
715 if (err < 0) {
716 dev_err(&client->dev, "Unable to write control register\n");
717 return -EIO;
718 }
719
720
721 if (part == RV1805) {
722
723
724
725
726
727
728 data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL2);
729 if (data < 0) {
730 dev_err(&client->dev,
731 "Unable to read control2 register\n");
732 return -EIO;
733 }
734
735 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL2,
736 data & ~ABX8XX_CTRL2_RSVD);
737 if (err < 0) {
738 dev_err(&client->dev,
739 "Unable to write control2 register\n");
740 return -EIO;
741 }
742
743
744
745
746
747
748 data = i2c_smbus_read_byte_data(client, ABX8XX_REG_OUT_CTRL);
749 if (data < 0) {
750 dev_err(&client->dev,
751 "Unable to read output control register\n");
752 return -EIO;
753 }
754
755
756
757
758
759 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY,
760 ABX8XX_CFG_KEY_MISC);
761 if (err < 0) {
762 dev_err(&client->dev,
763 "Unable to write configuration key\n");
764 return -EIO;
765 }
766
767 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OUT_CTRL,
768 data | ABX8XX_OUT_CTRL_EXDS);
769 if (err < 0) {
770 dev_err(&client->dev,
771 "Unable to write output control register\n");
772 return -EIO;
773 }
774 }
775
776
777 if (part == ABX80X) {
778 for (i = 0; abx80x_caps[i].pn; i++)
779 if (partnumber == abx80x_caps[i].pn)
780 break;
781 if (abx80x_caps[i].pn == 0) {
782 dev_err(&client->dev, "Unknown part: %04x\n",
783 partnumber);
784 return -EINVAL;
785 }
786 part = i;
787 }
788
789 if (partnumber != abx80x_caps[part].pn) {
790 dev_err(&client->dev, "partnumber mismatch %04x != %04x\n",
791 partnumber, abx80x_caps[part].pn);
792 return -EINVAL;
793 }
794
795 if (np && abx80x_caps[part].has_tc)
796 trickle_cfg = abx80x_dt_trickle_cfg(np);
797
798 if (trickle_cfg > 0) {
799 dev_info(&client->dev, "Enabling trickle charger: %02x\n",
800 trickle_cfg);
801 abx80x_enable_trickle_charger(client, trickle_cfg);
802 }
803
804 err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL,
805 BIT(2));
806 if (err)
807 return err;
808
809 priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
810 if (priv == NULL)
811 return -ENOMEM;
812
813 priv->rtc = devm_rtc_allocate_device(&client->dev);
814 if (IS_ERR(priv->rtc))
815 return PTR_ERR(priv->rtc);
816
817 priv->rtc->ops = &abx80x_rtc_ops;
818 priv->client = client;
819
820 i2c_set_clientdata(client, priv);
821
822 if (abx80x_caps[part].has_wdog) {
823 err = abx80x_setup_watchdog(priv);
824 if (err)
825 return err;
826 }
827
828 if (client->irq > 0) {
829 dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
830 err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
831 abx80x_handle_irq,
832 IRQF_SHARED | IRQF_ONESHOT,
833 "abx8xx",
834 client);
835 if (err) {
836 dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
837 client->irq = 0;
838 }
839 }
840
841 err = rtc_add_group(priv->rtc, &rtc_calib_attr_group);
842 if (err) {
843 dev_err(&client->dev, "Failed to create sysfs group: %d\n",
844 err);
845 return err;
846 }
847
848 return rtc_register_device(priv->rtc);
849}
850
851static const struct i2c_device_id abx80x_id[] = {
852 { "abx80x", ABX80X },
853 { "ab0801", AB0801 },
854 { "ab0803", AB0803 },
855 { "ab0804", AB0804 },
856 { "ab0805", AB0805 },
857 { "ab1801", AB1801 },
858 { "ab1803", AB1803 },
859 { "ab1804", AB1804 },
860 { "ab1805", AB1805 },
861 { "rv1805", RV1805 },
862 { }
863};
864MODULE_DEVICE_TABLE(i2c, abx80x_id);
865
866static struct i2c_driver abx80x_driver = {
867 .driver = {
868 .name = "rtc-abx80x",
869 },
870 .probe = abx80x_probe,
871 .id_table = abx80x_id,
872};
873
874module_i2c_driver(abx80x_driver);
875
876MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>");
877MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
878MODULE_DESCRIPTION("Abracon ABX80X RTC driver");
879MODULE_LICENSE("GPL v2");
880
