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ed13d89b AB |
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_YEAR 0x16 | |
28 | #define RX8010_RESV17 0x17 | |
29 | #define RX8010_ALMIN 0x18 | |
30 | #define RX8010_ALHOUR 0x19 | |
31 | #define RX8010_ALWDAY 0x1A | |
32 | #define RX8010_TCOUNT0 0x1B | |
33 | #define RX8010_TCOUNT1 0x1C | |
34 | #define RX8010_EXT 0x1D | |
35 | #define RX8010_FLAG 0x1E | |
36 | #define RX8010_CTRL 0x1F | |
37 | /* 0x20 to 0x2F are user registers */ | |
38 | #define RX8010_RESV30 0x30 | |
39 | #define RX8010_RESV31 0x32 | |
40 | #define RX8010_IRQ 0x32 | |
41 | ||
42 | #define RX8010_EXT_WADA BIT(3) | |
43 | ||
44 | #define RX8010_FLAG_VLF BIT(1) | |
45 | #define RX8010_FLAG_AF BIT(3) | |
46 | #define RX8010_FLAG_TF BIT(4) | |
47 | #define RX8010_FLAG_UF BIT(5) | |
48 | ||
49 | #define RX8010_CTRL_AIE BIT(3) | |
50 | #define RX8010_CTRL_UIE BIT(5) | |
51 | #define RX8010_CTRL_STOP BIT(6) | |
52 | #define RX8010_CTRL_TEST BIT(7) | |
53 | ||
54 | #define RX8010_ALARM_AE BIT(7) | |
55 | ||
56 | static const struct i2c_device_id rx8010_id[] = { | |
57 | { "rx8010", 0 }, | |
58 | { } | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(i2c, rx8010_id); | |
61 | ||
62 | struct rx8010_data { | |
63 | struct i2c_client *client; | |
64 | struct rtc_device *rtc; | |
65 | u8 ctrlreg; | |
66 | spinlock_t flags_lock; | |
67 | }; | |
68 | ||
69 | static 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 | spin_lock(&rx8010->flags_lock); | |
76 | ||
77 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); | |
78 | ||
79 | if (flagreg <= 0) { | |
80 | spin_unlock(&rx8010->flags_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 | spin_unlock(&rx8010->flags_lock); | |
105 | return IRQ_HANDLED; | |
106 | } | |
107 | ||
108 | static 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 rtc_valid_tm(dt); | |
138 | } | |
139 | ||
140 | static 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 | unsigned long irqflags; | |
147 | ||
148 | if ((dt->tm_year < 100) || (dt->tm_year > 199)) | |
149 | return -EINVAL; | |
150 | ||
151 | /* set STOP bit before changing clock/calendar */ | |
152 | ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL); | |
153 | if (ctrl < 0) | |
154 | return ctrl; | |
155 | rx8010->ctrlreg = ctrl | RX8010_CTRL_STOP; | |
156 | ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, | |
157 | rx8010->ctrlreg); | |
158 | if (ret < 0) | |
159 | return ret; | |
160 | ||
161 | date[RX8010_SEC - RX8010_SEC] = bin2bcd(dt->tm_sec); | |
162 | date[RX8010_MIN - RX8010_SEC] = bin2bcd(dt->tm_min); | |
163 | date[RX8010_HOUR - RX8010_SEC] = bin2bcd(dt->tm_hour); | |
164 | date[RX8010_MDAY - RX8010_SEC] = bin2bcd(dt->tm_mday); | |
165 | date[RX8010_MONTH - RX8010_SEC] = bin2bcd(dt->tm_mon + 1); | |
166 | date[RX8010_YEAR - RX8010_SEC] = bin2bcd(dt->tm_year - 100); | |
167 | date[RX8010_WDAY - RX8010_SEC] = bin2bcd(1 << dt->tm_wday); | |
168 | ||
169 | ret = i2c_smbus_write_i2c_block_data(rx8010->client, | |
170 | RX8010_SEC, 7, date); | |
171 | if (ret < 0) | |
172 | return ret; | |
173 | ||
174 | /* clear STOP bit after changing clock/calendar */ | |
175 | ctrl = i2c_smbus_read_byte_data(rx8010->client, RX8010_CTRL); | |
176 | if (ctrl < 0) | |
177 | return ctrl; | |
178 | rx8010->ctrlreg = ctrl & ~RX8010_CTRL_STOP; | |
179 | ret = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, | |
180 | rx8010->ctrlreg); | |
181 | if (ret < 0) | |
182 | return ret; | |
183 | ||
184 | spin_lock_irqsave(&rx8010->flags_lock, irqflags); | |
185 | ||
186 | flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); | |
187 | if (flagreg < 0) { | |
188 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); | |
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 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | static int rx8010_init_client(struct i2c_client *client) | |
202 | { | |
203 | struct rx8010_data *rx8010 = i2c_get_clientdata(client); | |
204 | u8 ctrl[2]; | |
205 | int need_clear = 0, err = 0; | |
206 | ||
207 | /* Initialize reserved registers as specified in datasheet */ | |
208 | err = i2c_smbus_write_byte_data(client, RX8010_RESV17, 0xD8); | |
209 | if (err < 0) | |
210 | return err; | |
211 | ||
212 | err = i2c_smbus_write_byte_data(client, RX8010_RESV30, 0x00); | |
213 | if (err < 0) | |
214 | return err; | |
215 | ||
216 | err = i2c_smbus_write_byte_data(client, RX8010_RESV31, 0x08); | |
217 | if (err < 0) | |
218 | return err; | |
219 | ||
220 | err = i2c_smbus_write_byte_data(client, RX8010_IRQ, 0x00); | |
221 | if (err < 0) | |
222 | return err; | |
223 | ||
224 | err = i2c_smbus_read_i2c_block_data(rx8010->client, RX8010_FLAG, | |
225 | 2, ctrl); | |
226 | if (err != 2) | |
227 | return err < 0 ? err : -EIO; | |
228 | ||
229 | if (ctrl[0] & RX8010_FLAG_VLF) | |
230 | dev_warn(&client->dev, "Frequency stop was detected\n"); | |
231 | ||
232 | if (ctrl[0] & RX8010_FLAG_AF) { | |
233 | dev_warn(&client->dev, "Alarm was detected\n"); | |
234 | need_clear = 1; | |
235 | } | |
236 | ||
237 | if (ctrl[0] & RX8010_FLAG_TF) | |
238 | need_clear = 1; | |
239 | ||
240 | if (ctrl[0] & RX8010_FLAG_UF) | |
241 | need_clear = 1; | |
242 | ||
243 | if (need_clear) { | |
244 | ctrl[0] &= ~(RX8010_FLAG_AF | RX8010_FLAG_TF | RX8010_FLAG_UF); | |
245 | err = i2c_smbus_write_byte_data(client, RX8010_FLAG, ctrl[0]); | |
246 | if (err < 0) | |
247 | return err; | |
248 | } | |
249 | ||
250 | rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST); | |
251 | ||
252 | return err; | |
253 | } | |
254 | ||
255 | static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
256 | { | |
257 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); | |
258 | struct i2c_client *client = rx8010->client; | |
259 | u8 alarmvals[3]; | |
260 | int flagreg; | |
261 | int err; | |
262 | ||
263 | err = i2c_smbus_read_i2c_block_data(client, RX8010_ALMIN, 3, alarmvals); | |
264 | if (err != 3) | |
265 | return err < 0 ? err : -EIO; | |
266 | ||
267 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); | |
268 | if (flagreg < 0) | |
269 | return flagreg; | |
270 | ||
271 | t->time.tm_sec = 0; | |
272 | t->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); | |
273 | t->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); | |
274 | ||
56d86a7e | 275 | if (!(alarmvals[2] & RX8010_ALARM_AE)) |
ed13d89b AB |
276 | t->time.tm_mday = bcd2bin(alarmvals[2] & 0x7f); |
277 | ||
ed13d89b AB |
278 | t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE); |
279 | t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled; | |
280 | ||
281 | return err; | |
282 | } | |
283 | ||
284 | static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
285 | { | |
286 | struct i2c_client *client = to_i2c_client(dev); | |
287 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); | |
288 | u8 alarmvals[3]; | |
289 | int extreg, flagreg; | |
290 | int err; | |
291 | unsigned long irqflags; | |
292 | ||
293 | spin_lock_irqsave(&rx8010->flags_lock, irqflags); | |
294 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); | |
295 | if (flagreg < 0) { | |
296 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); | |
297 | return flagreg; | |
298 | } | |
299 | ||
300 | if (rx8010->ctrlreg & (RX8010_CTRL_AIE | RX8010_CTRL_UIE)) { | |
301 | rx8010->ctrlreg &= ~(RX8010_CTRL_AIE | RX8010_CTRL_UIE); | |
302 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, | |
303 | rx8010->ctrlreg); | |
304 | if (err < 0) { | |
305 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); | |
306 | return err; | |
307 | } | |
308 | } | |
309 | ||
310 | flagreg &= ~RX8010_FLAG_AF; | |
311 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg); | |
312 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); | |
313 | if (err < 0) | |
314 | return err; | |
315 | ||
316 | alarmvals[0] = bin2bcd(t->time.tm_min); | |
317 | alarmvals[1] = bin2bcd(t->time.tm_hour); | |
318 | alarmvals[2] = bin2bcd(t->time.tm_mday); | |
319 | ||
320 | err = i2c_smbus_write_i2c_block_data(rx8010->client, RX8010_ALMIN, | |
321 | 2, alarmvals); | |
322 | if (err < 0) | |
323 | return err; | |
324 | ||
325 | extreg = i2c_smbus_read_byte_data(client, RX8010_EXT); | |
326 | if (extreg < 0) | |
327 | return extreg; | |
328 | ||
329 | extreg |= RX8010_EXT_WADA; | |
330 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_EXT, extreg); | |
331 | if (err < 0) | |
332 | return err; | |
333 | ||
334 | if (alarmvals[2] == 0) | |
335 | alarmvals[2] |= RX8010_ALARM_AE; | |
336 | ||
337 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_ALWDAY, | |
338 | alarmvals[2]); | |
339 | if (err < 0) | |
340 | return err; | |
341 | ||
342 | if (t->enabled) { | |
343 | if (rx8010->rtc->uie_rtctimer.enabled) | |
344 | rx8010->ctrlreg |= RX8010_CTRL_UIE; | |
345 | if (rx8010->rtc->aie_timer.enabled) | |
346 | rx8010->ctrlreg |= | |
347 | (RX8010_CTRL_AIE | RX8010_CTRL_UIE); | |
348 | ||
349 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, | |
350 | rx8010->ctrlreg); | |
351 | if (err < 0) | |
352 | return err; | |
353 | } | |
354 | ||
355 | return 0; | |
356 | } | |
357 | ||
358 | static int rx8010_alarm_irq_enable(struct device *dev, | |
359 | unsigned int enabled) | |
360 | { | |
361 | struct i2c_client *client = to_i2c_client(dev); | |
362 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); | |
363 | int flagreg; | |
364 | u8 ctrl; | |
365 | int err; | |
366 | ||
367 | ctrl = rx8010->ctrlreg; | |
368 | ||
369 | if (enabled) { | |
370 | if (rx8010->rtc->uie_rtctimer.enabled) | |
371 | ctrl |= RX8010_CTRL_UIE; | |
372 | if (rx8010->rtc->aie_timer.enabled) | |
373 | ctrl |= (RX8010_CTRL_AIE | RX8010_CTRL_UIE); | |
374 | } else { | |
375 | if (!rx8010->rtc->uie_rtctimer.enabled) | |
376 | ctrl &= ~RX8010_CTRL_UIE; | |
377 | if (!rx8010->rtc->aie_timer.enabled) | |
378 | ctrl &= ~RX8010_CTRL_AIE; | |
379 | } | |
380 | ||
381 | flagreg = i2c_smbus_read_byte_data(client, RX8010_FLAG); | |
382 | if (flagreg < 0) | |
383 | return flagreg; | |
384 | ||
385 | flagreg &= ~RX8010_FLAG_AF; | |
386 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_FLAG, flagreg); | |
387 | if (err < 0) | |
388 | return err; | |
389 | ||
390 | if (ctrl != rx8010->ctrlreg) { | |
391 | rx8010->ctrlreg = ctrl; | |
392 | err = i2c_smbus_write_byte_data(rx8010->client, RX8010_CTRL, | |
393 | rx8010->ctrlreg); | |
394 | if (err < 0) | |
395 | return err; | |
396 | } | |
397 | ||
398 | return 0; | |
399 | } | |
400 | ||
401 | static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
402 | { | |
403 | struct i2c_client *client = to_i2c_client(dev); | |
404 | struct rx8010_data *rx8010 = dev_get_drvdata(dev); | |
405 | int ret, tmp; | |
406 | int flagreg; | |
407 | unsigned long irqflags; | |
408 | ||
409 | switch (cmd) { | |
410 | case RTC_VL_READ: | |
411 | flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); | |
412 | if (flagreg < 0) | |
413 | return flagreg; | |
414 | ||
415 | tmp = !!(flagreg & RX8010_FLAG_VLF); | |
416 | if (copy_to_user((void __user *)arg, &tmp, sizeof(int))) | |
417 | return -EFAULT; | |
418 | ||
419 | return 0; | |
420 | ||
421 | case RTC_VL_CLR: | |
422 | spin_lock_irqsave(&rx8010->flags_lock, irqflags); | |
423 | flagreg = i2c_smbus_read_byte_data(rx8010->client, RX8010_FLAG); | |
424 | if (flagreg < 0) { | |
425 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); | |
426 | return flagreg; | |
427 | } | |
428 | ||
429 | flagreg &= ~RX8010_FLAG_VLF; | |
430 | ret = i2c_smbus_write_byte_data(client, RX8010_FLAG, flagreg); | |
431 | spin_unlock_irqrestore(&rx8010->flags_lock, irqflags); | |
432 | if (ret < 0) | |
433 | return ret; | |
434 | ||
435 | return 0; | |
436 | ||
437 | default: | |
438 | return -ENOIOCTLCMD; | |
439 | } | |
440 | } | |
441 | ||
442 | static struct rtc_class_ops rx8010_rtc_ops = { | |
443 | .read_time = rx8010_get_time, | |
444 | .set_time = rx8010_set_time, | |
445 | .ioctl = rx8010_ioctl, | |
446 | }; | |
447 | ||
448 | static int rx8010_probe(struct i2c_client *client, | |
449 | const struct i2c_device_id *id) | |
450 | { | |
451 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
452 | struct rx8010_data *rx8010; | |
453 | int err = 0; | |
454 | ||
455 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
456 | | I2C_FUNC_SMBUS_I2C_BLOCK)) { | |
457 | dev_err(&adapter->dev, "doesn't support required functionality\n"); | |
458 | return -EIO; | |
459 | } | |
460 | ||
461 | rx8010 = devm_kzalloc(&client->dev, sizeof(struct rx8010_data), | |
462 | GFP_KERNEL); | |
463 | if (!rx8010) | |
464 | return -ENOMEM; | |
465 | ||
466 | rx8010->client = client; | |
467 | i2c_set_clientdata(client, rx8010); | |
468 | ||
469 | spin_lock_init(&rx8010->flags_lock); | |
470 | ||
471 | err = rx8010_init_client(client); | |
472 | if (err) | |
473 | return err; | |
474 | ||
475 | if (client->irq > 0) { | |
476 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); | |
477 | err = devm_request_threaded_irq(&client->dev, client->irq, NULL, | |
478 | rx8010_irq_1_handler, | |
479 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
480 | "rx8010", client); | |
481 | ||
482 | if (err) { | |
483 | dev_err(&client->dev, "unable to request IRQ\n"); | |
484 | client->irq = 0; | |
485 | } else { | |
486 | rx8010_rtc_ops.read_alarm = rx8010_read_alarm; | |
487 | rx8010_rtc_ops.set_alarm = rx8010_set_alarm; | |
488 | rx8010_rtc_ops.alarm_irq_enable = rx8010_alarm_irq_enable; | |
489 | } | |
490 | } | |
491 | ||
492 | rx8010->rtc = devm_rtc_device_register(&client->dev, client->name, | |
493 | &rx8010_rtc_ops, THIS_MODULE); | |
494 | ||
495 | if (IS_ERR(rx8010->rtc)) { | |
496 | dev_err(&client->dev, "unable to register the class device\n"); | |
497 | return PTR_ERR(rx8010->rtc); | |
498 | } | |
499 | ||
500 | rx8010->rtc->max_user_freq = 1; | |
501 | ||
502 | return err; | |
503 | } | |
504 | ||
505 | static struct i2c_driver rx8010_driver = { | |
506 | .driver = { | |
507 | .name = "rtc-rx8010", | |
508 | }, | |
509 | .probe = rx8010_probe, | |
510 | .id_table = rx8010_id, | |
511 | }; | |
512 | ||
513 | module_i2c_driver(rx8010_driver); | |
514 | ||
515 | MODULE_AUTHOR("Akshay Bhat <akshay.bhat@timesys.com>"); | |
516 | MODULE_DESCRIPTION("Epson RX8010SJ RTC driver"); | |
517 | MODULE_LICENSE("GPL v2"); |