Commit | Line | Data |
---|---|---|
3c2b9075 WG |
1 | /* |
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 | |
d00cd819 | 10 | * <lm-sensors@lm-sensors.org> |
3c2b9075 WG |
11 | * 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 | */ | |
3c2b9075 | 21 | #include <linux/bcd.h> |
2ddd1869 | 22 | #include <linux/bitops.h> |
3c2b9075 | 23 | #include <linux/i2c.h> |
15d3bdc2 AB |
24 | #include <linux/kernel.h> |
25 | #include <linux/module.h> | |
3c2b9075 WG |
26 | #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 | |
2ddd1869 AB |
49 | #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) | |
3c2b9075 | 53 | |
2ddd1869 AB |
54 | #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) | |
3c2b9075 WG |
60 | |
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 | ||
66 | static const struct i2c_device_id rx8025_id[] = { | |
67 | { "rx8025", 0 }, | |
68 | { } | |
69 | }; | |
70 | MODULE_DEVICE_TABLE(i2c, rx8025_id); | |
71 | ||
72 | struct rx8025_data { | |
73 | struct i2c_client *client; | |
74 | struct rtc_device *rtc; | |
3c2b9075 | 75 | u8 ctrl1; |
3c2b9075 WG |
76 | }; |
77 | ||
fd9061fb | 78 | static s32 rx8025_read_reg(const struct i2c_client *client, u8 number) |
3c2b9075 | 79 | { |
fd9061fb | 80 | return i2c_smbus_read_byte_data(client, number << 4); |
3c2b9075 WG |
81 | } |
82 | ||
fd9061fb AB |
83 | static int rx8025_read_regs(const struct i2c_client *client, |
84 | u8 number, u8 length, u8 *values) | |
3c2b9075 | 85 | { |
fd9061fb AB |
86 | int ret = i2c_smbus_read_i2c_block_data(client, number << 4, length, |
87 | values); | |
88 | if (ret != length) | |
3c2b9075 | 89 | return ret < 0 ? ret : -EIO; |
3c2b9075 WG |
90 | |
91 | return 0; | |
92 | } | |
93 | ||
fd9061fb AB |
94 | static s32 rx8025_write_reg(const struct i2c_client *client, u8 number, |
95 | u8 value) | |
3c2b9075 | 96 | { |
fd9061fb | 97 | return i2c_smbus_write_byte_data(client, number << 4, value); |
3c2b9075 WG |
98 | } |
99 | ||
fd9061fb AB |
100 | static s32 rx8025_write_regs(const struct i2c_client *client, |
101 | u8 number, u8 length, const u8 *values) | |
3c2b9075 | 102 | { |
fd9061fb AB |
103 | return i2c_smbus_write_i2c_block_data(client, number << 4, |
104 | length, values); | |
3c2b9075 WG |
105 | } |
106 | ||
efbbb4fd AB |
107 | static 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 | ||
8c4a4467 AB |
132 | static 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 | ||
b6a57c95 | 145 | static irqreturn_t rx8025_handle_irq(int irq, void *dev_id) |
3c2b9075 WG |
146 | { |
147 | struct i2c_client *client = dev_id; | |
148 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
9dbe3852 | 149 | struct mutex *lock = &rx8025->rtc->ops_lock; |
fd9061fb | 150 | int status; |
3c2b9075 | 151 | |
9dbe3852 | 152 | mutex_lock(lock); |
fd9061fb AB |
153 | status = rx8025_read_reg(client, RX8025_REG_CTRL2); |
154 | if (status < 0) | |
3c2b9075 WG |
155 | 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; | |
3c2b9075 | 164 | rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); |
3c2b9075 WG |
165 | } |
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; | |
3c2b9075 | 173 | rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); |
3c2b9075 WG |
174 | } |
175 | ||
3c2b9075 | 176 | out: |
9dbe3852 AM |
177 | mutex_unlock(lock); |
178 | ||
b6a57c95 | 179 | return IRQ_HANDLED; |
3c2b9075 WG |
180 | } |
181 | ||
182 | static int rx8025_get_time(struct device *dev, struct rtc_time *dt) | |
183 | { | |
184 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
fd9061fb | 185 | u8 date[7]; |
efbbb4fd | 186 | int err; |
6f0a8cfe | 187 | |
efbbb4fd AB |
188 | err = rx8025_check_validity(dev); |
189 | if (err) | |
190 | return err; | |
6f0a8cfe | 191 | |
3c2b9075 WG |
192 | 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; | |
32672c55 | 211 | dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100; |
3c2b9075 WG |
212 | |
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 | ||
220 | static 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]; | |
8c4a4467 | 224 | int ret; |
3c2b9075 | 225 | |
32672c55 AB |
226 | if ((dt->tm_year < 100) || (dt->tm_year > 199)) |
227 | return -EINVAL; | |
3c2b9075 WG |
228 | |
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); | |
32672c55 | 244 | date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100); |
3c2b9075 WG |
245 | |
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 | ||
8c4a4467 AB |
251 | 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); | |
3c2b9075 WG |
256 | } |
257 | ||
6f0a8cfe | 258 | static int rx8025_init_client(struct i2c_client *client) |
3c2b9075 WG |
259 | { |
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 | ||
3c2b9075 WG |
272 | 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 | ||
5c66e1e0 | 277 | if (ctrl[1] & RX8025_BIT_CTRL2_CTFG) |
3c2b9075 WG |
278 | need_clear = 1; |
279 | ||
6f0a8cfe | 280 | if (need_clear) { |
a27c7bf6 | 281 | ctrl2 = ctrl[1]; |
8c4a4467 | 282 | ctrl2 &= ~(RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG | |
3c2b9075 | 283 | RX8025_BIT_CTRL2_DAFG); |
3c2b9075 WG |
284 | |
285 | err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); | |
286 | } | |
287 | out: | |
288 | return err; | |
289 | } | |
290 | ||
291 | /* Alarm support */ | |
292 | static 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; | |
fd9061fb AB |
296 | u8 ald[2]; |
297 | int ctrl2, err; | |
3c2b9075 WG |
298 | |
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 | ||
fd9061fb AB |
306 | ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); |
307 | if (ctrl2 < 0) | |
308 | return ctrl2; | |
3c2b9075 WG |
309 | |
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 | ||
337 | static 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 | ||
302c5608 AM |
347 | /* |
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 | ||
3c2b9075 WG |
358 | 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 | ||
389 | static 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 | ||
3c2b9075 WG |
411 | static 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, | |
3c2b9075 WG |
417 | }; |
418 | ||
419 | /* | |
420 | * Clock precision adjustment support | |
421 | * | |
422 | * According to the RX8025 SA/NB application manual the frequency and | |
b770ffd4 | 423 | * temperature characteristics can be approximated using the following |
3c2b9075 WG |
424 | * 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 | */ | |
436 | static int rx8025_get_clock_adjust(struct device *dev, int *adj) | |
437 | { | |
438 | struct i2c_client *client = to_i2c_client(dev); | |
fd9061fb | 439 | int digoff; |
3c2b9075 | 440 | |
fd9061fb AB |
441 | digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF); |
442 | if (digoff < 0) | |
443 | return digoff; | |
3c2b9075 WG |
444 | |
445 | *adj = digoff >= 64 ? digoff - 128 : digoff; | |
446 | if (*adj > 0) | |
447 | (*adj)--; | |
448 | *adj *= -RX8025_ADJ_RESOLUTION; | |
449 | ||
450 | return 0; | |
451 | } | |
452 | ||
453 | static 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 | ||
479 | static 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 | ||
492 | static 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 | ||
506 | static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR, | |
507 | rx8025_sysfs_show_clock_adjust, | |
508 | rx8025_sysfs_store_clock_adjust); | |
509 | ||
510 | static int rx8025_sysfs_register(struct device *dev) | |
511 | { | |
512 | return device_create_file(dev, &dev_attr_clock_adjust_ppb); | |
513 | } | |
514 | ||
515 | static void rx8025_sysfs_unregister(struct device *dev) | |
516 | { | |
517 | device_remove_file(dev, &dev_attr_clock_adjust_ppb); | |
518 | } | |
519 | ||
5a167f45 GKH |
520 | static int rx8025_probe(struct i2c_client *client, |
521 | const struct i2c_device_id *id) | |
3c2b9075 WG |
522 | { |
523 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
524 | struct rx8025_data *rx8025; | |
6f0a8cfe | 525 | int err = 0; |
3c2b9075 WG |
526 | |
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"); | |
dbcce7cf | 531 | return -EIO; |
3c2b9075 WG |
532 | } |
533 | ||
fac42b41 | 534 | rx8025 = devm_kzalloc(&client->dev, sizeof(*rx8025), GFP_KERNEL); |
b1f9d790 | 535 | if (!rx8025) |
dbcce7cf | 536 | return -ENOMEM; |
3c2b9075 WG |
537 | |
538 | rx8025->client = client; | |
539 | i2c_set_clientdata(client, rx8025); | |
3c2b9075 | 540 | |
6f0a8cfe | 541 | err = rx8025_init_client(client); |
3c2b9075 | 542 | if (err) |
dbcce7cf | 543 | return err; |
3c2b9075 | 544 | |
fac42b41 | 545 | rx8025->rtc = devm_rtc_device_register(&client->dev, client->name, |
3c2b9075 WG |
546 | &rx8025_rtc_ops, THIS_MODULE); |
547 | if (IS_ERR(rx8025->rtc)) { | |
3c2b9075 | 548 | dev_err(&client->dev, "unable to register the class device\n"); |
dbcce7cf | 549 | return PTR_ERR(rx8025->rtc); |
3c2b9075 WG |
550 | } |
551 | ||
552 | if (client->irq > 0) { | |
553 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); | |
f0b63a1d | 554 | err = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
0a966c07 AM |
555 | rx8025_handle_irq, |
556 | IRQF_ONESHOT, | |
557 | "rx8025", client); | |
3c2b9075 | 558 | if (err) { |
8a06513d AB |
559 | dev_err(&client->dev, "unable to request IRQ, alarms disabled\n"); |
560 | client->irq = 0; | |
3c2b9075 WG |
561 | } |
562 | } | |
563 | ||
3c2b9075 WG |
564 | rx8025->rtc->max_user_freq = 1; |
565 | ||
ef5f4a9e AM |
566 | /* the rx8025 alarm only supports a minute accuracy */ |
567 | rx8025->rtc->uie_unsupported = 1; | |
568 | ||
3c2b9075 | 569 | err = rx8025_sysfs_register(&client->dev); |
3c2b9075 WG |
570 | return err; |
571 | } | |
572 | ||
5a167f45 | 573 | static int rx8025_remove(struct i2c_client *client) |
3c2b9075 | 574 | { |
3c2b9075 | 575 | rx8025_sysfs_unregister(&client->dev); |
3c2b9075 WG |
576 | return 0; |
577 | } | |
578 | ||
579 | static struct i2c_driver rx8025_driver = { | |
580 | .driver = { | |
581 | .name = "rtc-rx8025", | |
3c2b9075 WG |
582 | }, |
583 | .probe = rx8025_probe, | |
5a167f45 | 584 | .remove = rx8025_remove, |
3c2b9075 WG |
585 | .id_table = rx8025_id, |
586 | }; | |
587 | ||
0abc9201 | 588 | module_i2c_driver(rx8025_driver); |
3c2b9075 WG |
589 | |
590 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
591 | MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver"); | |
592 | MODULE_LICENSE("GPL"); |