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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for the Epson RTC module RX-8010 SJ
4 *
5 * Copyright(C) Timesys Corporation 2015
6 * Copyright(C) General Electric Company 2015
7 */
8
9#include <linux/bcd.h>
10#include <linux/bitops.h>
11#include <linux/i2c.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/rtc.h>
15
16#define RX8010_SEC 0x10
17#define RX8010_MIN 0x11
18#define RX8010_HOUR 0x12
19#define RX8010_WDAY 0x13
20#define RX8010_MDAY 0x14
21#define RX8010_MONTH 0x15
22#define RX8010_YEAR 0x16
23#define RX8010_RESV17 0x17
24#define RX8010_ALMIN 0x18
25#define RX8010_ALHOUR 0x19
26#define RX8010_ALWDAY 0x1A
27#define RX8010_TCOUNT0 0x1B
28#define RX8010_TCOUNT1 0x1C
29#define RX8010_EXT 0x1D
30#define RX8010_FLAG 0x1E
31#define RX8010_CTRL 0x1F
32/* 0x20 to 0x2F are user registers */
33#define RX8010_RESV30 0x30
34#define RX8010_RESV31 0x31
35#define RX8010_IRQ 0x32
36
37#define RX8010_EXT_WADA BIT(3)
38
39#define RX8010_FLAG_VLF BIT(1)
40#define RX8010_FLAG_AF BIT(3)
41#define RX8010_FLAG_TF BIT(4)
42#define RX8010_FLAG_UF BIT(5)
43
44#define RX8010_CTRL_AIE BIT(3)
45#define RX8010_CTRL_UIE BIT(5)
46#define RX8010_CTRL_STOP BIT(6)
47#define RX8010_CTRL_TEST BIT(7)
48
49#define RX8010_ALARM_AE BIT(7)
50
51static const struct i2c_device_id rx8010_id[] = {
52 { "rx8010", 0 },
53 { }
54};
55MODULE_DEVICE_TABLE(i2c, rx8010_id);
56
57static const struct of_device_id rx8010_of_match[] = {
58 { .compatible = "epson,rx8010" },
59 { }
60};
61MODULE_DEVICE_TABLE(of, rx8010_of_match);
62
63struct rx8010_data {
64 struct i2c_client *client;
65 struct rtc_device *rtc;
66 u8 ctrlreg;
67};
68
69static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
70{
71 struct i2c_client *client = dev_id;
72 struct rx8010_data *rx8010 = i2c_get_clientdata(client);
73 int flagreg;
74
75 mutex_lock(&rx8010->rtc->ops_lock);
76
77 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
78
79 if (flagreg <= 0) {
80 mutex_unlock(&rx8010->rtc->ops_lock);
81 return IRQ_NONE;
82 }
83
84 if (flagreg & RX8010_FLAG_VLF)
85 dev_warn(&client->dev, "Frequency stop detected\n");
86
87 if (flagreg & RX8010_FLAG_TF) {
88 flagreg &= ~RX8010_FLAG_TF;
89 rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
90 }
91
92 if (flagreg & RX8010_FLAG_AF) {
93 flagreg &= ~RX8010_FLAG_AF;
94 rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
95 }
96
97 if (flagreg & RX8010_FLAG_UF) {
98 flagreg &= ~RX8010_FLAG_UF;
99 rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
100 }
101
102 i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
103
104 mutex_unlock(&rx8010->rtc->ops_lock);
105 return IRQ_HANDLED;
106}
107
108static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
109{
110 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
111 u8 date[7];
112 int flagreg;
113 int err;
114
115 flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
116 if (flagreg < 0)
117 return flagreg;
118
119 if (flagreg & RX8010_FLAG_VLF) {
120 dev_warn(dev, "Frequency stop detected\n");
121 return -EINVAL;
122 }
123
124 err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC,
125 7, date);
126 if (err != 7)
127 return err < 0 ? err : -EIO;
128
129 dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
130 dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
131 dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
132 dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
133 dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
134 dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
135 dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
136
137 return 0;
138}
139
140static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
141{
142 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
143 u8 date[7];
144 int ctrl, flagreg;
145 int ret;
146
147 if ((dt->tm_year < 100) || (dt->tm_year > 199))
148 return -EINVAL;
149
150 /* set STOP bit before changing clock/calendar */
151 ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
152 if (ctrl < 0)
153 return ctrl;
154 rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP;
155 ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
156 rx8010->ctrlreg);
157 if (ret < 0)
158 return ret;
159
160 date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
161 date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
162 date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
163 date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
164 date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
165 date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
166 date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
167
168 ret = i2c_smbus_write_i2c_block_data(rx8010->client,
169 RX8010_SEC, 7, date);
170 if (ret < 0)
171 return ret;
172
173 /* clear STOP bit after changing clock/calendar */
174 ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
175 if (ctrl < 0)
176 return ctrl;
177 rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP;
178 ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
179 rx8010->ctrlreg);
180 if (ret < 0)
181 return ret;
182
183 flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
184 if (flagreg < 0) {
185 return flagreg;
186 }
187
188 if (flagreg & RX8010_FLAG_VLF)
189 ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG,
190 flagreg & ~RX8010_FLAG_VLF);
191
192 return 0;
193}
194
195static int rx8010_init_client(struct i2c_client *client)
196{
197 struct rx8010_data *rx8010 = i2c_get_clientdata(client);
198 u8 ctrl[2];
199 int need_clear = 0, err = 0;
200
201 /* Initialize reserved registers as specified in datasheet */
202 err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8);
203 if (err < 0)
204 return err;
205
206 err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00);
207 if (err < 0)
208 return err;
209
210 err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08);
211 if (err < 0)
212 return err;
213
214 err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00);
215 if (err < 0)
216 return err;
217
218 err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG,
219 2, ctrl);
220 if (err != 2)
221 return err < 0 ? err : -EIO;
222
223 if (ctrl[0] & RX8010_FLAG_VLF)
224 dev_warn(&client->dev, "Frequency stop was detected\n");
225
226 if (ctrl[0] & RX8010_FLAG_AF) {
227 dev_warn(&client->dev, "Alarm was detected\n");
228 need_clear = 1;
229 }
230
231 if (ctrl[0] & RX8010_FLAG_TF)
232 need_clear = 1;
233
234 if (ctrl[0] & RX8010_FLAG_UF)
235 need_clear = 1;
236
237 if (need_clear) {
238 ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
239 err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]);
240 if (err < 0)
241 return err;
242 }
243
244 rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
245
246 return 0;
247}
248
249static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
250{
251 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
252 struct i2c_client *client = rx8010->client;
253 u8 alarmvals[3];
254 int flagreg;
255 int err;
256
257 err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals);
258 if (err != 3)
259 return err < 0 ? err : -EIO;
260
261 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
262 if (flagreg < 0)
263 return flagreg;
264
265 t->time.tm_sec = 0;
266 t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
267 t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
268
269 if (!(alarmvals[2] & RX8010_ALARM_AE))
270 t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
271
272 t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
273 t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
274
275 return 0;
276}
277
278static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
279{
280 struct i2c_client *client = to_i2c_client(dev);
281 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
282 u8 alarmvals[3];
283 int extreg, flagreg;
284 int err;
285
286 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
287 if (flagreg < 0) {
288 return flagreg;
289 }
290
291 if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
292 rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
293 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
294 rx8010->ctrlreg);
295 if (err < 0) {
296 return err;
297 }
298 }
299
300 flagreg &= ~RX8010_FLAG_AF;
301 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
302 if (err < 0)
303 return err;
304
305 alarmvals[0] = bin2bcd(t->time.tm_min);
306 alarmvals[1] = bin2bcd(t->time.tm_hour);
307 alarmvals[2] = bin2bcd(t->time.tm_mday);
308
309 err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN,
310 2, alarmvals);
311 if (err < 0)
312 return err;
313
314 extreg = i2c_smbus_read_byte_data(client, RX8010_EXT);
315 if (extreg < 0)
316 return extreg;
317
318 extreg |= RX8010_EXT_WADA;
319 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg);
320 if (err < 0)
321 return err;
322
323 if (alarmvals[2] == 0)
324 alarmvals[2] |= RX8010_ALARM_AE;
325
326 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY,
327 alarmvals[2]);
328 if (err < 0)
329 return err;
330
331 if (t->enabled) {
332 if (rx8010->rtc->uie_rtctimer.enabled)
333 rx8010->ctrlreg |= RX8010_CTRL_UIE;
334 if (rx8010->rtc->aie_timer.enabled)
335 rx8010->ctrlreg |=
336 (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
337
338 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
339 rx8010->ctrlreg);
340 if (err < 0)
341 return err;
342 }
343
344 return 0;
345}
346
347static int rx8010_alarm_irq_enable(struct device *dev,
348 unsigned int enabled)
349{
350 struct i2c_client *client = to_i2c_client(dev);
351 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
352 int flagreg;
353 u8 ctrl;
354 int err;
355
356 ctrl = rx8010->ctrlreg;
357
358 if (enabled) {
359 if (rx8010->rtc->uie_rtctimer.enabled)
360 ctrl |= RX8010_CTRL_UIE;
361 if (rx8010->rtc->aie_timer.enabled)
362 ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
363 } else {
364 if (!rx8010->rtc->uie_rtctimer.enabled)
365 ctrl &= ~RX8010_CTRL_UIE;
366 if (!rx8010->rtc->aie_timer.enabled)
367 ctrl &= ~RX8010_CTRL_AIE;
368 }
369
370 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
371 if (flagreg < 0)
372 return flagreg;
373
374 flagreg &= ~RX8010_FLAG_AF;
375 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
376 if (err < 0)
377 return err;
378
379 if (ctrl != rx8010->ctrlreg) {
380 rx8010->ctrlreg = ctrl;
381 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
382 rx8010->ctrlreg);
383 if (err < 0)
384 return err;
385 }
386
387 return 0;
388}
389
390static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
391{
392 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
393 int tmp;
394 int flagreg;
395
396 switch (cmd) {
397 case RTC_VL_READ:
398 flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
399 if (flagreg < 0)
400 return flagreg;
401
402 tmp = flagreg & RX8010_FLAG_VLF ? RTC_VL_DATA_INVALID : 0;
403 return put_user(tmp, (unsigned int __user *)arg);
404
405 default:
406 return -ENOIOCTLCMD;
407 }
408}
409
410static struct rtc_class_ops rx8010_rtc_ops = {
411 .read_time = rx8010_get_time,
412 .set_time = rx8010_set_time,
413 .ioctl = rx8010_ioctl,
414};
415
416static int rx8010_probe(struct i2c_client *client,
417 const struct i2c_device_id *id)
418{
419 struct i2c_adapter *adapter = client->adapter;
420 struct rx8010_data *rx8010;
421 int err = 0;
422
423 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
424 | I2C_FUNC_SMBUS_I2C_BLOCK)) {
425 dev_err(&adapter->dev, "doesn't support required functionality\n");
426 return -EIO;
427 }
428
429 rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data),
430 GFP_KERNEL);
431 if (!rx8010)
432 return -ENOMEM;
433
434 rx8010->client = client;
435 i2c_set_clientdata(client, rx8010);
436
437 err = rx8010_init_client(client);
438 if (err)
439 return err;
440
441 if (client->irq > 0) {
442 dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
443 err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
444 rx8010_irq_1_handler,
445 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
446 "rx8010", client);
447
448 if (err) {
449 dev_err(&client->dev, "unable to request IRQ\n");
450 client->irq = 0;
451 } else {
452 rx8010_rtc_ops.read_alarm = rx8010_read_alarm;
453 rx8010_rtc_ops.set_alarm = rx8010_set_alarm;
454 rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable;
455 }
456 }
457
458 rx8010->rtc = devm_rtc_device_register(&client->dev, client->name,
459 &rx8010_rtc_ops, THIS_MODULE);
460
461 if (IS_ERR(rx8010->rtc)) {
462 dev_err(&client->dev, "unable to register the class device\n");
463 return PTR_ERR(rx8010->rtc);
464 }
465
466 rx8010->rtc->max_user_freq = 1;
467
468 return 0;
469}
470
471static struct i2c_driver rx8010_driver = {
472 .driver = {
473 .name = "rtc-rx8010",
474 .of_match_table = of_match_ptr(rx8010_of_match),
475 },
476 .probe = rx8010_probe,
477 .id_table = rx8010_id,
478};
479
480module_i2c_driver(rx8010_driver);
481
482MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
483MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
484MODULE_LICENSE("GPL v2");
1/*
2 * Driver for the Epson RTC module RX-8010 SJ
3 *
4 * Copyright(C) Timesys Corporation 2015
5 * Copyright(C) General Electric Company 2015
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/bcd.h>
14#include <linux/bitops.h>
15#include <linux/i2c.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/rtc.h>
19
20#define RX8010_SEC 0x10
21#define RX8010_MIN 0x11
22#define RX8010_HOUR 0x12
23#define RX8010_WDAY 0x13
24#define RX8010_MDAY 0x14
25#define RX8010_MONTH 0x15
26#define RX8010_YEAR 0x16
27#define RX8010_RESV17 0x17
28#define RX8010_ALMIN 0x18
29#define RX8010_ALHOUR 0x19
30#define RX8010_ALWDAY 0x1A
31#define RX8010_TCOUNT0 0x1B
32#define RX8010_TCOUNT1 0x1C
33#define RX8010_EXT 0x1D
34#define RX8010_FLAG 0x1E
35#define RX8010_CTRL 0x1F
36/* 0x20 to 0x2F are user registers */
37#define RX8010_RESV30 0x30
38#define RX8010_RESV31 0x31
39#define RX8010_IRQ 0x32
40
41#define RX8010_EXT_WADA BIT(3)
42
43#define RX8010_FLAG_VLF BIT(1)
44#define RX8010_FLAG_AF BIT(3)
45#define RX8010_FLAG_TF BIT(4)
46#define RX8010_FLAG_UF BIT(5)
47
48#define RX8010_CTRL_AIE BIT(3)
49#define RX8010_CTRL_UIE BIT(5)
50#define RX8010_CTRL_STOP BIT(6)
51#define RX8010_CTRL_TEST BIT(7)
52
53#define RX8010_ALARM_AE BIT(7)
54
55static const struct i2c_device_id rx8010_id[] = {
56 { "rx8010", 0 },
57 { }
58};
59MODULE_DEVICE_TABLE(i2c, rx8010_id);
60
61static const struct of_device_id rx8010_of_match[] = {
62 { .compatible = "epson,rx8010" },
63 { }
64};
65MODULE_DEVICE_TABLE(of, rx8010_of_match);
66
67struct rx8010_data {
68 struct i2c_client *client;
69 struct rtc_device *rtc;
70 u8 ctrlreg;
71};
72
73static irqreturn_t rx8010_irq_1_handler(int irq, void *dev_id)
74{
75 struct i2c_client *client = dev_id;
76 struct rx8010_data *rx8010 = i2c_get_clientdata(client);
77 int flagreg;
78
79 mutex_lock(&rx8010->rtc->ops_lock);
80
81 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
82
83 if (flagreg <= 0) {
84 mutex_unlock(&rx8010->rtc->ops_lock);
85 return IRQ_NONE;
86 }
87
88 if (flagreg & RX8010_FLAG_VLF)
89 dev_warn(&client->dev, "Frequency stop detected\n");
90
91 if (flagreg & RX8010_FLAG_TF) {
92 flagreg &= ~RX8010_FLAG_TF;
93 rtc_update_irq(rx8010->rtc, 1, RTC_PF | RTC_IRQF);
94 }
95
96 if (flagreg & RX8010_FLAG_AF) {
97 flagreg &= ~RX8010_FLAG_AF;
98 rtc_update_irq(rx8010->rtc, 1, RTC_AF | RTC_IRQF);
99 }
100
101 if (flagreg & RX8010_FLAG_UF) {
102 flagreg &= ~RX8010_FLAG_UF;
103 rtc_update_irq(rx8010->rtc, 1, RTC_UF | RTC_IRQF);
104 }
105
106 i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
107
108 mutex_unlock(&rx8010->rtc->ops_lock);
109 return IRQ_HANDLED;
110}
111
112static int rx8010_get_time(struct device *dev, struct rtc_time *dt)
113{
114 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
115 u8 date[7];
116 int flagreg;
117 int err;
118
119 flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
120 if (flagreg < 0)
121 return flagreg;
122
123 if (flagreg & RX8010_FLAG_VLF) {
124 dev_warn(dev, "Frequency stop detected\n");
125 return -EINVAL;
126 }
127
128 err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_SEC,
129 7, date);
130 if (err != 7)
131 return err < 0 ? err : -EIO;
132
133 dt->tm_sec = bcd2bin(date[RX8010_SEC - RX8010_SEC] & 0x7f);
134 dt->tm_min = bcd2bin(date[RX8010_MIN - RX8010_SEC] & 0x7f);
135 dt->tm_hour = bcd2bin(date[RX8010_HOUR - RX8010_SEC] & 0x3f);
136 dt->tm_mday = bcd2bin(date[RX8010_MDAY - RX8010_SEC] & 0x3f);
137 dt->tm_mon = bcd2bin(date[RX8010_MONTH - RX8010_SEC] & 0x1f) - 1;
138 dt->tm_year = bcd2bin(date[RX8010_YEAR - RX8010_SEC]) + 100;
139 dt->tm_wday = ffs(date[RX8010_WDAY - RX8010_SEC] & 0x7f);
140
141 return 0;
142}
143
144static int rx8010_set_time(struct device *dev, struct rtc_time *dt)
145{
146 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
147 u8 date[7];
148 int ctrl, flagreg;
149 int ret;
150
151 if ((dt->tm_year < 100) || (dt->tm_year > 199))
152 return -EINVAL;
153
154 /* set STOP bit before changing clock/calendar */
155 ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
156 if (ctrl < 0)
157 return ctrl;
158 rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP;
159 ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
160 rx8010->ctrlreg);
161 if (ret < 0)
162 return ret;
163
164 date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec);
165 date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min);
166 date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour);
167 date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday);
168 date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1);
169 date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100);
170 date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday);
171
172 ret = i2c_smbus_write_i2c_block_data(rx8010->client,
173 RX8010_SEC, 7, date);
174 if (ret < 0)
175 return ret;
176
177 /* clear STOP bit after changing clock/calendar */
178 ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL);
179 if (ctrl < 0)
180 return ctrl;
181 rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP;
182 ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
183 rx8010->ctrlreg);
184 if (ret < 0)
185 return ret;
186
187 flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
188 if (flagreg < 0) {
189 return flagreg;
190 }
191
192 if (flagreg & RX8010_FLAG_VLF)
193 ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG,
194 flagreg & ~RX8010_FLAG_VLF);
195
196 return 0;
197}
198
199static int rx8010_init_client(struct i2c_client *client)
200{
201 struct rx8010_data *rx8010 = i2c_get_clientdata(client);
202 u8 ctrl[2];
203 int need_clear = 0, err = 0;
204
205 /* Initialize reserved registers as specified in datasheet */
206 err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8);
207 if (err < 0)
208 return err;
209
210 err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00);
211 if (err < 0)
212 return err;
213
214 err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08);
215 if (err < 0)
216 return err;
217
218 err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00);
219 if (err < 0)
220 return err;
221
222 err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG,
223 2, ctrl);
224 if (err != 2)
225 return err < 0 ? err : -EIO;
226
227 if (ctrl[0] & RX8010_FLAG_VLF)
228 dev_warn(&client->dev, "Frequency stop was detected\n");
229
230 if (ctrl[0] & RX8010_FLAG_AF) {
231 dev_warn(&client->dev, "Alarm was detected\n");
232 need_clear = 1;
233 }
234
235 if (ctrl[0] & RX8010_FLAG_TF)
236 need_clear = 1;
237
238 if (ctrl[0] & RX8010_FLAG_UF)
239 need_clear = 1;
240
241 if (need_clear) {
242 ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF);
243 err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]);
244 if (err < 0)
245 return err;
246 }
247
248 rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
249
250 return 0;
251}
252
253static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
254{
255 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
256 struct i2c_client *client = rx8010->client;
257 u8 alarmvals[3];
258 int flagreg;
259 int err;
260
261 err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals);
262 if (err != 3)
263 return err < 0 ? err : -EIO;
264
265 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
266 if (flagreg < 0)
267 return flagreg;
268
269 t->time.tm_sec = 0;
270 t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f);
271 t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
272
273 if (!(alarmvals[2] & RX8010_ALARM_AE))
274 t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f);
275
276 t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
277 t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
278
279 return 0;
280}
281
282static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)
283{
284 struct i2c_client *client = to_i2c_client(dev);
285 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
286 u8 alarmvals[3];
287 int extreg, flagreg;
288 int err;
289
290 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
291 if (flagreg < 0) {
292 return flagreg;
293 }
294
295 if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) {
296 rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE);
297 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
298 rx8010->ctrlreg);
299 if (err < 0) {
300 return err;
301 }
302 }
303
304 flagreg &= ~RX8010_FLAG_AF;
305 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
306 if (err < 0)
307 return err;
308
309 alarmvals[0] = bin2bcd(t->time.tm_min);
310 alarmvals[1] = bin2bcd(t->time.tm_hour);
311 alarmvals[2] = bin2bcd(t->time.tm_mday);
312
313 err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN,
314 2, alarmvals);
315 if (err < 0)
316 return err;
317
318 extreg = i2c_smbus_read_byte_data(client, RX8010_EXT);
319 if (extreg < 0)
320 return extreg;
321
322 extreg |= RX8010_EXT_WADA;
323 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg);
324 if (err < 0)
325 return err;
326
327 if (alarmvals[2] == 0)
328 alarmvals[2] |= RX8010_ALARM_AE;
329
330 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY,
331 alarmvals[2]);
332 if (err < 0)
333 return err;
334
335 if (t->enabled) {
336 if (rx8010->rtc->uie_rtctimer.enabled)
337 rx8010->ctrlreg |= RX8010_CTRL_UIE;
338 if (rx8010->rtc->aie_timer.enabled)
339 rx8010->ctrlreg |=
340 (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
341
342 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
343 rx8010->ctrlreg);
344 if (err < 0)
345 return err;
346 }
347
348 return 0;
349}
350
351static int rx8010_alarm_irq_enable(struct device *dev,
352 unsigned int enabled)
353{
354 struct i2c_client *client = to_i2c_client(dev);
355 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
356 int flagreg;
357 u8 ctrl;
358 int err;
359
360 ctrl = rx8010->ctrlreg;
361
362 if (enabled) {
363 if (rx8010->rtc->uie_rtctimer.enabled)
364 ctrl |= RX8010_CTRL_UIE;
365 if (rx8010->rtc->aie_timer.enabled)
366 ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE);
367 } else {
368 if (!rx8010->rtc->uie_rtctimer.enabled)
369 ctrl &= ~RX8010_CTRL_UIE;
370 if (!rx8010->rtc->aie_timer.enabled)
371 ctrl &= ~RX8010_CTRL_AIE;
372 }
373
374 flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG);
375 if (flagreg < 0)
376 return flagreg;
377
378 flagreg &= ~RX8010_FLAG_AF;
379 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg);
380 if (err < 0)
381 return err;
382
383 if (ctrl != rx8010->ctrlreg) {
384 rx8010->ctrlreg = ctrl;
385 err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL,
386 rx8010->ctrlreg);
387 if (err < 0)
388 return err;
389 }
390
391 return 0;
392}
393
394static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
395{
396 struct i2c_client *client = to_i2c_client(dev);
397 struct rx8010_data *rx8010 = dev_get_drvdata(dev);
398 int ret, tmp;
399 int flagreg;
400
401 switch (cmd) {
402 case RTC_VL_READ:
403 flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
404 if (flagreg < 0)
405 return flagreg;
406
407 tmp = !!(flagreg & RX8010_FLAG_VLF);
408 if (copy_to_user((void __user *)arg, &tmp, sizeof(int)))
409 return -EFAULT;
410
411 return 0;
412
413 case RTC_VL_CLR:
414 flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG);
415 if (flagreg < 0) {
416 return flagreg;
417 }
418
419 flagreg &= ~RX8010_FLAG_VLF;
420 ret = i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg);
421 if (ret < 0)
422 return ret;
423
424 return 0;
425
426 default:
427 return -ENOIOCTLCMD;
428 }
429}
430
431static struct rtc_class_ops rx8010_rtc_ops = {
432 .read_time = rx8010_get_time,
433 .set_time = rx8010_set_time,
434 .ioctl = rx8010_ioctl,
435};
436
437static int rx8010_probe(struct i2c_client *client,
438 const struct i2c_device_id *id)
439{
440 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
441 struct rx8010_data *rx8010;
442 int err = 0;
443
444 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
445 | I2C_FUNC_SMBUS_I2C_BLOCK)) {
446 dev_err(&adapter->dev, "doesn't support required functionality\n");
447 return -EIO;
448 }
449
450 rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data),
451 GFP_KERNEL);
452 if (!rx8010)
453 return -ENOMEM;
454
455 rx8010->client = client;
456 i2c_set_clientdata(client, rx8010);
457
458 err = rx8010_init_client(client);
459 if (err)
460 return err;
461
462 if (client->irq > 0) {
463 dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
464 err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
465 rx8010_irq_1_handler,
466 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
467 "rx8010", client);
468
469 if (err) {
470 dev_err(&client->dev, "unable to request IRQ\n");
471 client->irq = 0;
472 } else {
473 rx8010_rtc_ops.read_alarm = rx8010_read_alarm;
474 rx8010_rtc_ops.set_alarm = rx8010_set_alarm;
475 rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable;
476 }
477 }
478
479 rx8010->rtc = devm_rtc_device_register(&client->dev, client->name,
480 &rx8010_rtc_ops, THIS_MODULE);
481
482 if (IS_ERR(rx8010->rtc)) {
483 dev_err(&client->dev, "unable to register the class device\n");
484 return PTR_ERR(rx8010->rtc);
485 }
486
487 rx8010->rtc->max_user_freq = 1;
488
489 return err;
490}
491
492static struct i2c_driver rx8010_driver = {
493 .driver = {
494 .name = "rtc-rx8010",
495 .of_match_table = of_match_ptr(rx8010_of_match),
496 },
497 .probe = rx8010_probe,
498 .id_table = rx8010_id,
499};
500
501module_i2c_driver(rx8010_driver);
502
503MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>");
504MODULE_DESCRIPTION("Epson RX8010SJ RTC driver");
505MODULE_LICENSE("GPL v2");