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Commit | Line | Data |
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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 | |
10 | * <http://lists.lm-sensors.org/mailman/listinfo/lm-sensors> | |
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 | ||
b6a57c95 | 107 | static irqreturn_t rx8025_handle_irq(int irq, void *dev_id) |
3c2b9075 WG |
108 | { |
109 | struct i2c_client *client = dev_id; | |
110 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
fd9061fb | 111 | int status; |
3c2b9075 | 112 | |
fd9061fb AB |
113 | status = rx8025_read_reg(client, RX8025_REG_CTRL2); |
114 | if (status < 0) | |
3c2b9075 WG |
115 | goto out; |
116 | ||
117 | if (!(status & RX8025_BIT_CTRL2_XST)) | |
118 | dev_warn(&client->dev, "Oscillation stop was detected," | |
119 | "you may have to readjust the clock\n"); | |
120 | ||
121 | if (status & RX8025_BIT_CTRL2_CTFG) { | |
122 | /* periodic */ | |
123 | status &= ~RX8025_BIT_CTRL2_CTFG; | |
3c2b9075 | 124 | rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); |
3c2b9075 WG |
125 | } |
126 | ||
127 | if (status & RX8025_BIT_CTRL2_DAFG) { | |
128 | /* alarm */ | |
129 | status &= RX8025_BIT_CTRL2_DAFG; | |
130 | if (rx8025_write_reg(client, RX8025_REG_CTRL1, | |
131 | rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE)) | |
132 | goto out; | |
3c2b9075 | 133 | rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); |
3c2b9075 WG |
134 | } |
135 | ||
136 | /* acknowledge IRQ */ | |
137 | rx8025_write_reg(client, RX8025_REG_CTRL2, | |
138 | status | RX8025_BIT_CTRL2_XST); | |
139 | ||
140 | out: | |
b6a57c95 | 141 | return IRQ_HANDLED; |
3c2b9075 WG |
142 | } |
143 | ||
144 | static int rx8025_get_time(struct device *dev, struct rtc_time *dt) | |
145 | { | |
146 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
fd9061fb AB |
147 | u8 date[7]; |
148 | int ctrl, err; | |
3c2b9075 | 149 | |
fd9061fb AB |
150 | ctrl = rx8025_read_reg(rx8025->client, RX8025_REG_CTRL2); |
151 | if (ctrl < 0) | |
152 | return ctrl; | |
6f0a8cfe AB |
153 | |
154 | if (ctrl & RX8025_BIT_CTRL2_PON) { | |
155 | dev_warn(dev, "power-on reset detected, date is invalid\n"); | |
156 | return -EINVAL; | |
157 | } | |
158 | ||
159 | if (!(ctrl & RX8025_BIT_CTRL2_XST)) { | |
160 | dev_warn(dev, "crystal stopped, date is invalid\n"); | |
161 | return -EINVAL; | |
162 | } | |
163 | ||
3c2b9075 WG |
164 | err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date); |
165 | if (err) | |
166 | return err; | |
167 | ||
168 | dev_dbg(dev, "%s: read 0x%02x 0x%02x " | |
169 | "0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__, | |
170 | date[0], date[1], date[2], date[3], date[4], | |
171 | date[5], date[6]); | |
172 | ||
173 | dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f); | |
174 | dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f); | |
175 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
176 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f); | |
177 | else | |
178 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12 | |
179 | + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0); | |
180 | ||
181 | dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f); | |
182 | dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1; | |
32672c55 | 183 | dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100; |
3c2b9075 WG |
184 | |
185 | dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__, | |
186 | dt->tm_sec, dt->tm_min, dt->tm_hour, | |
187 | dt->tm_mday, dt->tm_mon, dt->tm_year); | |
188 | ||
189 | return rtc_valid_tm(dt); | |
190 | } | |
191 | ||
192 | static int rx8025_set_time(struct device *dev, struct rtc_time *dt) | |
193 | { | |
194 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
195 | u8 date[7]; | |
196 | ||
32672c55 AB |
197 | if ((dt->tm_year < 100) || (dt->tm_year > 199)) |
198 | return -EINVAL; | |
3c2b9075 WG |
199 | |
200 | /* | |
201 | * Here the read-only bits are written as "0". I'm not sure if that | |
202 | * is sound. | |
203 | */ | |
204 | date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec); | |
205 | date[RX8025_REG_MIN] = bin2bcd(dt->tm_min); | |
206 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
207 | date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour); | |
208 | else | |
209 | date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) | |
210 | | bin2bcd((dt->tm_hour + 11) % 12 + 1); | |
211 | ||
212 | date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday); | |
213 | date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday); | |
214 | date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1); | |
32672c55 | 215 | date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100); |
3c2b9075 WG |
216 | |
217 | dev_dbg(dev, | |
218 | "%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", | |
219 | __func__, | |
220 | date[0], date[1], date[2], date[3], date[4], date[5], date[6]); | |
221 | ||
222 | return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date); | |
223 | } | |
224 | ||
6f0a8cfe | 225 | static int rx8025_init_client(struct i2c_client *client) |
3c2b9075 WG |
226 | { |
227 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
228 | u8 ctrl[2], ctrl2; | |
229 | int need_clear = 0; | |
230 | int err; | |
231 | ||
232 | err = rx8025_read_regs(rx8025->client, RX8025_REG_CTRL1, 2, ctrl); | |
233 | if (err) | |
234 | goto out; | |
235 | ||
236 | /* Keep test bit zero ! */ | |
237 | rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST; | |
238 | ||
239 | if (ctrl[1] & RX8025_BIT_CTRL2_PON) { | |
240 | dev_warn(&client->dev, "power-on reset was detected, " | |
241 | "you may have to readjust the clock\n"); | |
6f0a8cfe | 242 | need_clear = 1; |
3c2b9075 WG |
243 | } |
244 | ||
245 | if (ctrl[1] & RX8025_BIT_CTRL2_VDET) { | |
246 | dev_warn(&client->dev, "a power voltage drop was detected, " | |
247 | "you may have to readjust the clock\n"); | |
6f0a8cfe | 248 | need_clear = 1; |
3c2b9075 WG |
249 | } |
250 | ||
251 | if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) { | |
252 | dev_warn(&client->dev, "Oscillation stop was detected," | |
253 | "you may have to readjust the clock\n"); | |
6f0a8cfe | 254 | need_clear = 1; |
3c2b9075 WG |
255 | } |
256 | ||
257 | if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) { | |
258 | dev_warn(&client->dev, "Alarm was detected\n"); | |
259 | need_clear = 1; | |
260 | } | |
261 | ||
262 | if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG)) | |
263 | need_clear = 1; | |
264 | ||
6f0a8cfe | 265 | if (need_clear) { |
a27c7bf6 | 266 | ctrl2 = ctrl[1]; |
3c2b9075 WG |
267 | ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET | |
268 | RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG | | |
269 | RX8025_BIT_CTRL2_DAFG); | |
270 | ctrl2 |= RX8025_BIT_CTRL2_XST; | |
271 | ||
272 | err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); | |
273 | } | |
274 | out: | |
275 | return err; | |
276 | } | |
277 | ||
278 | /* Alarm support */ | |
279 | static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
280 | { | |
281 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
282 | struct i2c_client *client = rx8025->client; | |
fd9061fb AB |
283 | u8 ald[2]; |
284 | int ctrl2, err; | |
3c2b9075 WG |
285 | |
286 | if (client->irq <= 0) | |
287 | return -EINVAL; | |
288 | ||
289 | err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald); | |
290 | if (err) | |
291 | return err; | |
292 | ||
fd9061fb AB |
293 | ctrl2 = rx8025_read_reg(client, RX8025_REG_CTRL2); |
294 | if (ctrl2 < 0) | |
295 | return ctrl2; | |
3c2b9075 WG |
296 | |
297 | dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n", | |
298 | __func__, ald[0], ald[1], ctrl2); | |
299 | ||
300 | /* Hardware alarms precision is 1 minute! */ | |
301 | t->time.tm_sec = 0; | |
302 | t->time.tm_min = bcd2bin(ald[0] & 0x7f); | |
303 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
304 | t->time.tm_hour = bcd2bin(ald[1] & 0x3f); | |
305 | else | |
306 | t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12 | |
307 | + (ald[1] & 0x20 ? 12 : 0); | |
308 | ||
309 | t->time.tm_wday = -1; | |
310 | t->time.tm_mday = -1; | |
311 | t->time.tm_mon = -1; | |
312 | t->time.tm_year = -1; | |
313 | ||
314 | dev_dbg(dev, "%s: date: %ds %dm %dh %dmd %dm %dy\n", | |
315 | __func__, | |
316 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
317 | t->time.tm_mday, t->time.tm_mon, t->time.tm_year); | |
318 | t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE); | |
319 | t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled; | |
320 | ||
321 | return err; | |
322 | } | |
323 | ||
324 | static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
325 | { | |
326 | struct i2c_client *client = to_i2c_client(dev); | |
327 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
328 | u8 ald[2]; | |
329 | int err; | |
330 | ||
331 | if (client->irq <= 0) | |
332 | return -EINVAL; | |
333 | ||
334 | /* Hardware alarm precision is 1 minute! */ | |
335 | ald[0] = bin2bcd(t->time.tm_min); | |
336 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
337 | ald[1] = bin2bcd(t->time.tm_hour); | |
338 | else | |
339 | ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0) | |
340 | | bin2bcd((t->time.tm_hour + 11) % 12 + 1); | |
341 | ||
342 | dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]); | |
343 | ||
344 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) { | |
345 | rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE; | |
346 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
347 | rx8025->ctrl1); | |
348 | if (err) | |
349 | return err; | |
350 | } | |
351 | err = rx8025_write_regs(rx8025->client, RX8025_REG_ALDMIN, 2, ald); | |
352 | if (err) | |
353 | return err; | |
354 | ||
355 | if (t->enabled) { | |
356 | rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE; | |
357 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
358 | rx8025->ctrl1); | |
359 | if (err) | |
360 | return err; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
367 | { | |
368 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
369 | u8 ctrl1; | |
370 | int err; | |
371 | ||
372 | ctrl1 = rx8025->ctrl1; | |
373 | if (enabled) | |
374 | ctrl1 |= RX8025_BIT_CTRL1_DALE; | |
375 | else | |
376 | ctrl1 &= ~RX8025_BIT_CTRL1_DALE; | |
377 | ||
378 | if (ctrl1 != rx8025->ctrl1) { | |
379 | rx8025->ctrl1 = ctrl1; | |
380 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
381 | rx8025->ctrl1); | |
382 | if (err) | |
383 | return err; | |
384 | } | |
385 | return 0; | |
386 | } | |
387 | ||
3c2b9075 WG |
388 | static struct rtc_class_ops rx8025_rtc_ops = { |
389 | .read_time = rx8025_get_time, | |
390 | .set_time = rx8025_set_time, | |
391 | .read_alarm = rx8025_read_alarm, | |
392 | .set_alarm = rx8025_set_alarm, | |
393 | .alarm_irq_enable = rx8025_alarm_irq_enable, | |
3c2b9075 WG |
394 | }; |
395 | ||
396 | /* | |
397 | * Clock precision adjustment support | |
398 | * | |
399 | * According to the RX8025 SA/NB application manual the frequency and | |
b770ffd4 | 400 | * temperature characteristics can be approximated using the following |
3c2b9075 WG |
401 | * equation: |
402 | * | |
403 | * df = a * (ut - t)**2 | |
404 | * | |
405 | * df: Frequency deviation in any temperature | |
406 | * a : Coefficient = (-35 +-5) * 10**-9 | |
407 | * ut: Ultimate temperature in degree = +25 +-5 degree | |
408 | * t : Any temperature in degree | |
409 | * | |
410 | * Note that the clock adjustment in ppb must be entered (which is | |
411 | * the negative value of the deviation). | |
412 | */ | |
413 | static int rx8025_get_clock_adjust(struct device *dev, int *adj) | |
414 | { | |
415 | struct i2c_client *client = to_i2c_client(dev); | |
fd9061fb | 416 | int digoff; |
3c2b9075 | 417 | |
fd9061fb AB |
418 | digoff = rx8025_read_reg(client, RX8025_REG_DIGOFF); |
419 | if (digoff < 0) | |
420 | return digoff; | |
3c2b9075 WG |
421 | |
422 | *adj = digoff >= 64 ? digoff - 128 : digoff; | |
423 | if (*adj > 0) | |
424 | (*adj)--; | |
425 | *adj *= -RX8025_ADJ_RESOLUTION; | |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | static int rx8025_set_clock_adjust(struct device *dev, int adj) | |
431 | { | |
432 | struct i2c_client *client = to_i2c_client(dev); | |
433 | u8 digoff; | |
434 | int err; | |
435 | ||
436 | adj /= -RX8025_ADJ_RESOLUTION; | |
437 | if (adj > RX8025_ADJ_DATA_MAX) | |
438 | adj = RX8025_ADJ_DATA_MAX; | |
439 | else if (adj < RX8025_ADJ_DATA_MIN) | |
440 | adj = RX8025_ADJ_DATA_MIN; | |
441 | else if (adj > 0) | |
442 | adj++; | |
443 | else if (adj < 0) | |
444 | adj += 128; | |
445 | digoff = adj; | |
446 | ||
447 | err = rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff); | |
448 | if (err) | |
449 | return err; | |
450 | ||
451 | dev_dbg(dev, "%s: write 0x%02x\n", __func__, digoff); | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
456 | static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev, | |
457 | struct device_attribute *attr, | |
458 | char *buf) | |
459 | { | |
460 | int err, adj; | |
461 | ||
462 | err = rx8025_get_clock_adjust(dev, &adj); | |
463 | if (err) | |
464 | return err; | |
465 | ||
466 | return sprintf(buf, "%d\n", adj); | |
467 | } | |
468 | ||
469 | static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev, | |
470 | struct device_attribute *attr, | |
471 | const char *buf, size_t count) | |
472 | { | |
473 | int adj, err; | |
474 | ||
475 | if (sscanf(buf, "%i", &adj) != 1) | |
476 | return -EINVAL; | |
477 | ||
478 | err = rx8025_set_clock_adjust(dev, adj); | |
479 | ||
480 | return err ? err : count; | |
481 | } | |
482 | ||
483 | static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR, | |
484 | rx8025_sysfs_show_clock_adjust, | |
485 | rx8025_sysfs_store_clock_adjust); | |
486 | ||
487 | static int rx8025_sysfs_register(struct device *dev) | |
488 | { | |
489 | return device_create_file(dev, &dev_attr_clock_adjust_ppb); | |
490 | } | |
491 | ||
492 | static void rx8025_sysfs_unregister(struct device *dev) | |
493 | { | |
494 | device_remove_file(dev, &dev_attr_clock_adjust_ppb); | |
495 | } | |
496 | ||
5a167f45 GKH |
497 | static int rx8025_probe(struct i2c_client *client, |
498 | const struct i2c_device_id *id) | |
3c2b9075 WG |
499 | { |
500 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
501 | struct rx8025_data *rx8025; | |
6f0a8cfe | 502 | int err = 0; |
3c2b9075 WG |
503 | |
504 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
505 | | I2C_FUNC_SMBUS_I2C_BLOCK)) { | |
506 | dev_err(&adapter->dev, | |
507 | "doesn't support required functionality\n"); | |
dbcce7cf | 508 | return -EIO; |
3c2b9075 WG |
509 | } |
510 | ||
fac42b41 | 511 | rx8025 = devm_kzalloc(&client->dev, sizeof(*rx8025), GFP_KERNEL); |
3c2b9075 | 512 | if (!rx8025) { |
dbcce7cf | 513 | return -ENOMEM; |
3c2b9075 WG |
514 | } |
515 | ||
516 | rx8025->client = client; | |
517 | i2c_set_clientdata(client, rx8025); | |
3c2b9075 | 518 | |
6f0a8cfe | 519 | err = rx8025_init_client(client); |
3c2b9075 | 520 | if (err) |
dbcce7cf | 521 | return err; |
3c2b9075 | 522 | |
fac42b41 | 523 | rx8025->rtc = devm_rtc_device_register(&client->dev, client->name, |
3c2b9075 WG |
524 | &rx8025_rtc_ops, THIS_MODULE); |
525 | if (IS_ERR(rx8025->rtc)) { | |
3c2b9075 | 526 | dev_err(&client->dev, "unable to register the class device\n"); |
dbcce7cf | 527 | return PTR_ERR(rx8025->rtc); |
3c2b9075 WG |
528 | } |
529 | ||
530 | if (client->irq > 0) { | |
531 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); | |
f0b63a1d AB |
532 | err = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
533 | rx8025_handle_irq, 0, "rx8025", | |
534 | client); | |
3c2b9075 | 535 | if (err) { |
8a06513d AB |
536 | dev_err(&client->dev, "unable to request IRQ, alarms disabled\n"); |
537 | client->irq = 0; | |
3c2b9075 WG |
538 | } |
539 | } | |
540 | ||
541 | rx8025->rtc->irq_freq = 1; | |
542 | rx8025->rtc->max_user_freq = 1; | |
543 | ||
544 | err = rx8025_sysfs_register(&client->dev); | |
3c2b9075 WG |
545 | return err; |
546 | } | |
547 | ||
5a167f45 | 548 | static int rx8025_remove(struct i2c_client *client) |
3c2b9075 | 549 | { |
3c2b9075 | 550 | rx8025_sysfs_unregister(&client->dev); |
3c2b9075 WG |
551 | return 0; |
552 | } | |
553 | ||
554 | static struct i2c_driver rx8025_driver = { | |
555 | .driver = { | |
556 | .name = "rtc-rx8025", | |
3c2b9075 WG |
557 | }, |
558 | .probe = rx8025_probe, | |
5a167f45 | 559 | .remove = rx8025_remove, |
3c2b9075 WG |
560 | .id_table = rx8025_id, |
561 | }; | |
562 | ||
0abc9201 | 563 | module_i2c_driver(rx8025_driver); |
3c2b9075 WG |
564 | |
565 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
566 | MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver"); | |
567 | MODULE_LICENSE("GPL"); |