blob: 9f105efbc5464815717f1a9bf622e947cabebbe2 [file] [log] [blame]
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -07001/*
2 * Driver for Epson's RTC module RX-8025 SA/NB
3 *
4 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
5 *
6 * Copyright (C) 2005 by Digi International Inc.
7 * All rights reserved.
8 *
9 * Modified by fengjh at rising.com.cn
Leslie Laud00cd812016-01-28 21:17:22 -080010 * <lm-sensors@lm-sensors.org>
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070011 * 2006.11
12 *
13 * Code cleanup by Sergei Poselenov, <sposelenov@emcraft.com>
14 * Converted to new style by Wolfgang Grandegger <wg@grandegger.com>
15 * Alarm and periodic interrupt added by Dmitry Rakhchev <rda@emcraft.com>
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * version 2 as published by the Free Software Foundation.
20 */
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070021#include <linux/bcd.h>
Alexandre Belloni2ddd1862015-07-25 11:50:22 +020022#include <linux/bitops.h>
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070023#include <linux/i2c.h>
Alexandre Belloni15d3bdc2015-07-24 15:50:23 +020024#include <linux/kernel.h>
25#include <linux/module.h>
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070026#include <linux/rtc.h>
27
28/* Register definitions */
29#define RX8025_REG_SEC 0x00
30#define RX8025_REG_MIN 0x01
31#define RX8025_REG_HOUR 0x02
32#define RX8025_REG_WDAY 0x03
33#define RX8025_REG_MDAY 0x04
34#define RX8025_REG_MONTH 0x05
35#define RX8025_REG_YEAR 0x06
36#define RX8025_REG_DIGOFF 0x07
37#define RX8025_REG_ALWMIN 0x08
38#define RX8025_REG_ALWHOUR 0x09
39#define RX8025_REG_ALWWDAY 0x0a
40#define RX8025_REG_ALDMIN 0x0b
41#define RX8025_REG_ALDHOUR 0x0c
42/* 0x0d is reserved */
43#define RX8025_REG_CTRL1 0x0e
44#define RX8025_REG_CTRL2 0x0f
45
46#define RX8025_BIT_CTRL1_CT (7 << 0)
47/* 1 Hz periodic level irq */
48#define RX8025_BIT_CTRL1_CT_1HZ 4
Alexandre Belloni2ddd1862015-07-25 11:50:22 +020049#define RX8025_BIT_CTRL1_TEST BIT(3)
50#define RX8025_BIT_CTRL1_1224 BIT(5)
51#define RX8025_BIT_CTRL1_DALE BIT(6)
52#define RX8025_BIT_CTRL1_WALE BIT(7)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070053
Alexandre Belloni2ddd1862015-07-25 11:50:22 +020054#define RX8025_BIT_CTRL2_DAFG BIT(0)
55#define RX8025_BIT_CTRL2_WAFG BIT(1)
56#define RX8025_BIT_CTRL2_CTFG BIT(2)
57#define RX8025_BIT_CTRL2_PON BIT(4)
58#define RX8025_BIT_CTRL2_XST BIT(5)
59#define RX8025_BIT_CTRL2_VDET BIT(6)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070060
61/* Clock precision adjustment */
62#define RX8025_ADJ_RESOLUTION 3050 /* in ppb */
63#define RX8025_ADJ_DATA_MAX 62
64#define RX8025_ADJ_DATA_MIN -62
65
66static const struct i2c_device_id rx8025_id[] = {
67 { "rx8025", 0 },
68 { }
69};
70MODULE_DEVICE_TABLE(i2c, rx8025_id);
71
72struct rx8025_data {
73 struct i2c_client *client;
74 struct rtc_device *rtc;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070075 u8 ctrl1;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070076};
77
Alexandre Bellonifd9061f2015-08-04 00:40:25 +020078static s32 rx8025_read_reg(const struct i2c_client *client, u8 number)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070079{
Alexandre Bellonifd9061f2015-08-04 00:40:25 +020080 return i2c_smbus_read_byte_data(client, number << 4);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070081}
82
Alexandre Bellonifd9061f2015-08-04 00:40:25 +020083static int rx8025_read_regs(const struct i2c_client *client,
84 u8 number, u8 length, u8 *values)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070085{
Alexandre Bellonifd9061f2015-08-04 00:40:25 +020086 int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length,
87 values);
88 if (ret != length)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070089 return ret < 0 ? ret : -EIO;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070090
91 return 0;
92}
93
Alexandre Bellonifd9061f2015-08-04 00:40:25 +020094static s32 rx8025_write_reg(const struct i2c_client *client, u8 number,
95 u8 value)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070096{
Alexandre Bellonifd9061f2015-08-04 00:40:25 +020097 return i2c_smbus_write_byte_data(client, number << 4, value);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -070098}
99
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200100static s32 rx8025_write_regs(const struct i2c_client *client,
101 u8 number, u8 length, const u8 *values)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700102{
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200103 return i2c_smbus_write_i2c_block_data(client, number << 4,
104 length, values);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700105}
106
Alexandre Belloniefbbb4f2015-08-04 11:33:59 +0200107static int rx8025_check_validity(struct device *dev)
108{
109 struct rx8025_data *rx8025 = dev_get_drvdata(dev);
110 int ctrl2;
111
112 ctrl2 = rx8025_read_reg(rx8025->client, RX8025_REG_CTRL2);
113 if (ctrl2 < 0)
114 return ctrl2;
115
116 if (ctrl2 & RX8025_BIT_CTRL2_VDET)
117 dev_warn(dev, "power voltage drop detected\n");
118
119 if (ctrl2 & RX8025_BIT_CTRL2_PON) {
120 dev_warn(dev, "power-on reset detected, date is invalid\n");
121 return -EINVAL;
122 }
123
124 if (!(ctrl2 & RX8025_BIT_CTRL2_XST)) {
125 dev_warn(dev, "crystal stopped, date is invalid\n");
126 return -EINVAL;
127 }
128
129 return 0;
130}
131
Alexandre Belloni8c4a4462015-08-04 10:48:20 +0200132static int rx8025_reset_validity(struct i2c_client *client)
133{
134 int ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
135
136 if (ctrl2 < 0)
137 return ctrl2;
138
139 ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET);
140
141 return rx8025_write_reg(client, RX8025_REG_CTRL2,
142 ctrl2 | RX8025_BIT_CTRL2_XST);
143}
144
Alexandre Bellonib6a57c92015-07-24 15:59:43 +0200145static irqreturn_t rx8025_handle_irq(int irq, void *dev_id)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700146{
147 struct i2c_client *client = dev_id;
148 struct rx8025_data *rx8025 = i2c_get_clientdata(client);
Akinobu Mita9dbe3852016-02-15 23:49:07 +0900149 struct mutex *lock = &rx8025->rtc->ops_lock;
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200150 int status;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700151
Akinobu Mita9dbe3852016-02-15 23:49:07 +0900152 mutex_lock(lock);
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200153 status = rx8025_read_reg(client, RX8025_REG_CTRL2);
154 if (status < 0)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700155 goto out;
156
157 if (!(status & RX8025_BIT_CTRL2_XST))
158 dev_warn(&client->dev, "Oscillation stop was detected,"
159 "you may have to readjust the clock\n");
160
161 if (status & RX8025_BIT_CTRL2_CTFG) {
162 /* periodic */
163 status &= ~RX8025_BIT_CTRL2_CTFG;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700164 rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700165 }
166
167 if (status & RX8025_BIT_CTRL2_DAFG) {
168 /* alarm */
169 status &= RX8025_BIT_CTRL2_DAFG;
170 if (rx8025_write_reg(client, RX8025_REG_CTRL1,
171 rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE))
172 goto out;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700173 rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700174 }
175
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700176out:
Akinobu Mita9dbe3852016-02-15 23:49:07 +0900177 mutex_unlock(lock);
178
Alexandre Bellonib6a57c92015-07-24 15:59:43 +0200179 return IRQ_HANDLED;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700180}
181
182static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
183{
184 struct rx8025_data *rx8025 = dev_get_drvdata(dev);
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200185 u8 date[7];
Alexandre Belloniefbbb4f2015-08-04 11:33:59 +0200186 int err;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700187
Alexandre Belloniefbbb4f2015-08-04 11:33:59 +0200188 err = rx8025_check_validity(dev);
189 if (err)
190 return err;
Alexandre Belloni6f0a8cf2015-07-26 10:13:31 +0200191
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700192 err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date);
193 if (err)
194 return err;
195
196 dev_dbg(dev, "%s: read 0x%02x 0x%02x "
197 "0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__,
198 date[0], date[1], date[2], date[3], date[4],
199 date[5], date[6]);
200
201 dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f);
202 dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f);
203 if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
204 dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f);
205 else
206 dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12
207 + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0);
208
209 dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
210 dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
Alexandre Belloni32672c52015-07-25 12:07:37 +0200211 dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700212
213 dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
214 dt->tm_sec, dt->tm_min, dt->tm_hour,
215 dt->tm_mday, dt->tm_mon, dt->tm_year);
216
217 return rtc_valid_tm(dt);
218}
219
220static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
221{
222 struct rx8025_data *rx8025 = dev_get_drvdata(dev);
223 u8 date[7];
Alexandre Belloni8c4a4462015-08-04 10:48:20 +0200224 int ret;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700225
Alexandre Belloni32672c52015-07-25 12:07:37 +0200226 if ((dt->tm_year < 100) || (dt->tm_year > 199))
227 return -EINVAL;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700228
229 /*
230 * Here the read-only bits are written as "0". I'm not sure if that
231 * is sound.
232 */
233 date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec);
234 date[RX8025_REG_MIN] = bin2bcd(dt->tm_min);
235 if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
236 date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour);
237 else
238 date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0)
239 | bin2bcd((dt->tm_hour + 11) % 12 + 1);
240
241 date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
242 date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
243 date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
Alexandre Belloni32672c52015-07-25 12:07:37 +0200244 date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700245
246 dev_dbg(dev,
247 "%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",
248 __func__,
249 date[0], date[1], date[2], date[3], date[4], date[5], date[6]);
250
Alexandre Belloni8c4a4462015-08-04 10:48:20 +0200251 ret = rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date);
252 if (ret < 0)
253 return ret;
254
255 return rx8025_reset_validity(rx8025->client);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700256}
257
Alexandre Belloni6f0a8cf2015-07-26 10:13:31 +0200258static int rx8025_init_client(struct i2c_client *client)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700259{
260 struct rx8025_data *rx8025 = i2c_get_clientdata(client);
261 u8 ctrl[2], ctrl2;
262 int need_clear = 0;
263 int err;
264
265 err = rx8025_read_regs(rx8025->client, RX8025_REG_CTRL1, 2, ctrl);
266 if (err)
267 goto out;
268
269 /* Keep test bit zero ! */
270 rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST;
271
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700272 if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) {
273 dev_warn(&client->dev, "Alarm was detected\n");
274 need_clear = 1;
275 }
276
Alexandre Belloni5c66e1e2015-08-04 11:24:33 +0200277 if (ctrl[1] & RX8025_BIT_CTRL2_CTFG)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700278 need_clear = 1;
279
Alexandre Belloni6f0a8cf2015-07-26 10:13:31 +0200280 if (need_clear) {
Alexandre Bellonia27c7bf2015-08-04 10:46:22 +0200281 ctrl2 = ctrl[1];
Alexandre Belloni8c4a4462015-08-04 10:48:20 +0200282 ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG |
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700283 RX8025_BIT_CTRL2_DAFG);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700284
285 err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2);
286 }
287out:
288 return err;
289}
290
291/* Alarm support */
292static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t)
293{
294 struct rx8025_data *rx8025 = dev_get_drvdata(dev);
295 struct i2c_client *client = rx8025->client;
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200296 u8 ald[2];
297 int ctrl2, err;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700298
299 if (client->irq <= 0)
300 return -EINVAL;
301
302 err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald);
303 if (err)
304 return err;
305
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200306 ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2);
307 if (ctrl2 < 0)
308 return ctrl2;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700309
310 dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n",
311 __func__, ald[0], ald[1], ctrl2);
312
313 /* Hardware alarms precision is 1 minute! */
314 t->time.tm_sec = 0;
315 t->time.tm_min = bcd2bin(ald[0] & 0x7f);
316 if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
317 t->time.tm_hour = bcd2bin(ald[1] & 0x3f);
318 else
319 t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12
320 + (ald[1] & 0x20 ? 12 : 0);
321
322 t->time.tm_wday = -1;
323 t->time.tm_mday = -1;
324 t->time.tm_mon = -1;
325 t->time.tm_year = -1;
326
327 dev_dbg(dev, "%s: date: %ds %dm %dh %dmd %dm %dy\n",
328 __func__,
329 t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
330 t->time.tm_mday, t->time.tm_mon, t->time.tm_year);
331 t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE);
332 t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled;
333
334 return err;
335}
336
337static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t)
338{
339 struct i2c_client *client = to_i2c_client(dev);
340 struct rx8025_data *rx8025 = dev_get_drvdata(dev);
341 u8 ald[2];
342 int err;
343
344 if (client->irq <= 0)
345 return -EINVAL;
346
Akinobu Mita302c5602016-02-15 23:49:08 +0900347 /*
348 * Hardware alarm precision is 1 minute!
349 * round up to nearest minute
350 */
351 if (t->time.tm_sec) {
352 time64_t alarm_time = rtc_tm_to_time64(&t->time);
353
354 alarm_time += 60 - t->time.tm_sec;
355 rtc_time64_to_tm(alarm_time, &t->time);
356 }
357
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700358 ald[0] = bin2bcd(t->time.tm_min);
359 if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224)
360 ald[1] = bin2bcd(t->time.tm_hour);
361 else
362 ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0)
363 | bin2bcd((t->time.tm_hour + 11) % 12 + 1);
364
365 dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]);
366
367 if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) {
368 rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
369 err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
370 rx8025->ctrl1);
371 if (err)
372 return err;
373 }
374 err = rx8025_write_regs(rx8025->client, RX8025_REG_ALDMIN, 2, ald);
375 if (err)
376 return err;
377
378 if (t->enabled) {
379 rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE;
380 err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
381 rx8025->ctrl1);
382 if (err)
383 return err;
384 }
385
386 return 0;
387}
388
389static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled)
390{
391 struct rx8025_data *rx8025 = dev_get_drvdata(dev);
392 u8 ctrl1;
393 int err;
394
395 ctrl1 = rx8025->ctrl1;
396 if (enabled)
397 ctrl1 |= RX8025_BIT_CTRL1_DALE;
398 else
399 ctrl1 &= ~RX8025_BIT_CTRL1_DALE;
400
401 if (ctrl1 != rx8025->ctrl1) {
402 rx8025->ctrl1 = ctrl1;
403 err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1,
404 rx8025->ctrl1);
405 if (err)
406 return err;
407 }
408 return 0;
409}
410
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700411static struct rtc_class_ops rx8025_rtc_ops = {
412 .read_time = rx8025_get_time,
413 .set_time = rx8025_set_time,
414 .read_alarm = rx8025_read_alarm,
415 .set_alarm = rx8025_set_alarm,
416 .alarm_irq_enable = rx8025_alarm_irq_enable,
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700417};
418
419/*
420 * Clock precision adjustment support
421 *
422 * According to the RX8025 SA/NB application manual the frequency and
Thomas Weberb770ffd2010-07-19 08:22:43 +0200423 * temperature characteristics can be approximated using the following
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700424 * equation:
425 *
426 * df = a * (ut - t)**2
427 *
428 * df: Frequency deviation in any temperature
429 * a : Coefficient = (-35 +-5) * 10**-9
430 * ut: Ultimate temperature in degree = +25 +-5 degree
431 * t : Any temperature in degree
432 *
433 * Note that the clock adjustment in ppb must be entered (which is
434 * the negative value of the deviation).
435 */
436static int rx8025_get_clock_adjust(struct device *dev, int *adj)
437{
438 struct i2c_client *client = to_i2c_client(dev);
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200439 int digoff;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700440
Alexandre Bellonifd9061f2015-08-04 00:40:25 +0200441 digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF);
442 if (digoff < 0)
443 return digoff;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700444
445 *adj = digoff >= 64 ? digoff - 128 : digoff;
446 if (*adj > 0)
447 (*adj)--;
448 *adj *= -RX8025_ADJ_RESOLUTION;
449
450 return 0;
451}
452
453static int rx8025_set_clock_adjust(struct device *dev, int adj)
454{
455 struct i2c_client *client = to_i2c_client(dev);
456 u8 digoff;
457 int err;
458
459 adj /= -RX8025_ADJ_RESOLUTION;
460 if (adj > RX8025_ADJ_DATA_MAX)
461 adj = RX8025_ADJ_DATA_MAX;
462 else if (adj < RX8025_ADJ_DATA_MIN)
463 adj = RX8025_ADJ_DATA_MIN;
464 else if (adj > 0)
465 adj++;
466 else if (adj < 0)
467 adj += 128;
468 digoff = adj;
469
470 err = rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff);
471 if (err)
472 return err;
473
474 dev_dbg(dev, "%s: write 0x%02x\n", __func__, digoff);
475
476 return 0;
477}
478
479static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev,
480 struct device_attribute *attr,
481 char *buf)
482{
483 int err, adj;
484
485 err = rx8025_get_clock_adjust(dev, &adj);
486 if (err)
487 return err;
488
489 return sprintf(buf, "%d\n", adj);
490}
491
492static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev,
493 struct device_attribute *attr,
494 const char *buf, size_t count)
495{
496 int adj, err;
497
498 if (sscanf(buf, "%i", &adj) != 1)
499 return -EINVAL;
500
501 err = rx8025_set_clock_adjust(dev, adj);
502
503 return err ? err : count;
504}
505
506static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR,
507 rx8025_sysfs_show_clock_adjust,
508 rx8025_sysfs_store_clock_adjust);
509
510static int rx8025_sysfs_register(struct device *dev)
511{
512 return device_create_file(dev, &dev_attr_clock_adjust_ppb);
513}
514
515static void rx8025_sysfs_unregister(struct device *dev)
516{
517 device_remove_file(dev, &dev_attr_clock_adjust_ppb);
518}
519
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800520static int rx8025_probe(struct i2c_client *client,
521 const struct i2c_device_id *id)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700522{
523 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
524 struct rx8025_data *rx8025;
Alexandre Belloni6f0a8cf2015-07-26 10:13:31 +0200525 int err = 0;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700526
527 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
528 | I2C_FUNC_SMBUS_I2C_BLOCK)) {
529 dev_err(&adapter->dev,
530 "doesn't support required functionality\n");
Alexandre Bellonidbcce7c2015-07-24 16:12:10 +0200531 return -EIO;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700532 }
533
Jingoo Hanfac42b42013-07-03 15:07:10 -0700534 rx8025 = devm_kzalloc(&client->dev, sizeof(*rx8025), GFP_KERNEL);
Alexandre Bellonib1f9d792015-09-26 16:25:28 +0200535 if (!rx8025)
Alexandre Bellonidbcce7c2015-07-24 16:12:10 +0200536 return -ENOMEM;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700537
538 rx8025->client = client;
539 i2c_set_clientdata(client, rx8025);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700540
Alexandre Belloni6f0a8cf2015-07-26 10:13:31 +0200541 err = rx8025_init_client(client);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700542 if (err)
Alexandre Bellonidbcce7c2015-07-24 16:12:10 +0200543 return err;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700544
Jingoo Hanfac42b42013-07-03 15:07:10 -0700545 rx8025->rtc = devm_rtc_device_register(&client->dev, client->name,
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700546 &rx8025_rtc_ops, THIS_MODULE);
547 if (IS_ERR(rx8025->rtc)) {
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700548 dev_err(&client->dev, "unable to register the class device\n");
Alexandre Bellonidbcce7c2015-07-24 16:12:10 +0200549 return PTR_ERR(rx8025->rtc);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700550 }
551
552 if (client->irq > 0) {
553 dev_info(&client->dev, "IRQ %d supplied\n", client->irq);
Alexandre Bellonif0b63a12015-07-24 16:07:30 +0200554 err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
Akinobu Mita0a966c02016-02-15 23:49:06 +0900555 rx8025_handle_irq,
556 IRQF_ONESHOT,
557 "rx8025", client);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700558 if (err) {
Alexandre Belloni8a065132015-08-04 00:45:37 +0200559 dev_err(&client->dev, "unable to request IRQ, alarms disabled\n");
560 client->irq = 0;
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700561 }
562 }
563
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700564 rx8025->rtc->max_user_freq = 1;
565
Akinobu Mitaef5f4a92016-02-15 23:49:09 +0900566 /* the rx8025 alarm only supports a minute accuracy */
567 rx8025->rtc->uie_unsupported = 1;
568
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700569 err = rx8025_sysfs_register(&client->dev);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700570 return err;
571}
572
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800573static int rx8025_remove(struct i2c_client *client)
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700574{
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700575 rx8025_sysfs_unregister(&client->dev);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700576 return 0;
577}
578
579static struct i2c_driver rx8025_driver = {
580 .driver = {
581 .name = "rtc-rx8025",
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700582 },
583 .probe = rx8025_probe,
Greg Kroah-Hartman5a167f42012-12-21 13:09:38 -0800584 .remove = rx8025_remove,
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700585 .id_table = rx8025_id,
586};
587
Axel Lin0abc9202012-03-23 15:02:31 -0700588module_i2c_driver(rx8025_driver);
Wolfgang Grandegger3c2b9072009-06-17 16:26:11 -0700589
590MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
591MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver");
592MODULE_LICENSE("GPL");