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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 | ||
78 | static int rx8025_read_reg(struct i2c_client *client, int number, u8 *value) | |
79 | { | |
2e10e74d | 80 | int ret = i2c_smbus_read_byte_data(client, number << 4); |
3c2b9075 WG |
81 | |
82 | if (ret < 0) { | |
83 | dev_err(&client->dev, "Unable to read register #%d\n", number); | |
84 | return ret; | |
85 | } | |
86 | ||
87 | *value = ret; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | static int rx8025_read_regs(struct i2c_client *client, | |
92 | int number, u8 length, u8 *values) | |
93 | { | |
2e10e74d | 94 | int ret = i2c_smbus_read_i2c_block_data(client, number << 4, |
3c2b9075 WG |
95 | length, values); |
96 | ||
97 | if (ret != length) { | |
98 | dev_err(&client->dev, "Unable to read registers #%d..#%d\n", | |
99 | number, number + length - 1); | |
100 | return ret < 0 ? ret : -EIO; | |
101 | } | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static int rx8025_write_reg(struct i2c_client *client, int number, u8 value) | |
107 | { | |
108 | int ret = i2c_smbus_write_byte_data(client, number << 4, value); | |
109 | ||
110 | if (ret) | |
111 | dev_err(&client->dev, "Unable to write register #%d\n", | |
112 | number); | |
113 | ||
114 | return ret; | |
115 | } | |
116 | ||
117 | static int rx8025_write_regs(struct i2c_client *client, | |
118 | int number, u8 length, u8 *values) | |
119 | { | |
2e10e74d | 120 | int ret = i2c_smbus_write_i2c_block_data(client, number << 4, |
3c2b9075 WG |
121 | length, values); |
122 | ||
123 | if (ret) | |
124 | dev_err(&client->dev, "Unable to write registers #%d..#%d\n", | |
125 | number, number + length - 1); | |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
b6a57c95 | 130 | static irqreturn_t rx8025_handle_irq(int irq, void *dev_id) |
3c2b9075 WG |
131 | { |
132 | struct i2c_client *client = dev_id; | |
133 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
3c2b9075 WG |
134 | u8 status; |
135 | ||
3c2b9075 WG |
136 | if (rx8025_read_reg(client, RX8025_REG_CTRL2, &status)) |
137 | goto out; | |
138 | ||
139 | if (!(status & RX8025_BIT_CTRL2_XST)) | |
140 | dev_warn(&client->dev, "Oscillation stop was detected," | |
141 | "you may have to readjust the clock\n"); | |
142 | ||
143 | if (status & RX8025_BIT_CTRL2_CTFG) { | |
144 | /* periodic */ | |
145 | status &= ~RX8025_BIT_CTRL2_CTFG; | |
3c2b9075 | 146 | rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); |
3c2b9075 WG |
147 | } |
148 | ||
149 | if (status & RX8025_BIT_CTRL2_DAFG) { | |
150 | /* alarm */ | |
151 | status &= RX8025_BIT_CTRL2_DAFG; | |
152 | if (rx8025_write_reg(client, RX8025_REG_CTRL1, | |
153 | rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE)) | |
154 | goto out; | |
3c2b9075 | 155 | rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); |
3c2b9075 WG |
156 | } |
157 | ||
158 | /* acknowledge IRQ */ | |
159 | rx8025_write_reg(client, RX8025_REG_CTRL2, | |
160 | status | RX8025_BIT_CTRL2_XST); | |
161 | ||
162 | out: | |
b6a57c95 | 163 | return IRQ_HANDLED; |
3c2b9075 WG |
164 | } |
165 | ||
166 | static int rx8025_get_time(struct device *dev, struct rtc_time *dt) | |
167 | { | |
168 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
6f0a8cfe | 169 | u8 date[7], ctrl; |
3c2b9075 WG |
170 | int err; |
171 | ||
6f0a8cfe AB |
172 | err = rx8025_read_reg(rx8025->client, RX8025_REG_CTRL2, &ctrl); |
173 | if (err) | |
174 | return err; | |
175 | ||
176 | if (ctrl & RX8025_BIT_CTRL2_PON) { | |
177 | dev_warn(dev, "power-on reset detected, date is invalid\n"); | |
178 | return -EINVAL; | |
179 | } | |
180 | ||
181 | if (!(ctrl & RX8025_BIT_CTRL2_XST)) { | |
182 | dev_warn(dev, "crystal stopped, date is invalid\n"); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
3c2b9075 WG |
186 | err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date); |
187 | if (err) | |
188 | return err; | |
189 | ||
190 | dev_dbg(dev, "%s: read 0x%02x 0x%02x " | |
191 | "0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__, | |
192 | date[0], date[1], date[2], date[3], date[4], | |
193 | date[5], date[6]); | |
194 | ||
195 | dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f); | |
196 | dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f); | |
197 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
198 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f); | |
199 | else | |
200 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12 | |
201 | + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0); | |
202 | ||
203 | dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f); | |
204 | dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1; | |
32672c55 | 205 | dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100; |
3c2b9075 WG |
206 | |
207 | dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__, | |
208 | dt->tm_sec, dt->tm_min, dt->tm_hour, | |
209 | dt->tm_mday, dt->tm_mon, dt->tm_year); | |
210 | ||
211 | return rtc_valid_tm(dt); | |
212 | } | |
213 | ||
214 | static int rx8025_set_time(struct device *dev, struct rtc_time *dt) | |
215 | { | |
216 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
217 | u8 date[7]; | |
218 | ||
32672c55 AB |
219 | if ((dt->tm_year < 100) || (dt->tm_year > 199)) |
220 | return -EINVAL; | |
3c2b9075 WG |
221 | |
222 | /* | |
223 | * Here the read-only bits are written as "0". I'm not sure if that | |
224 | * is sound. | |
225 | */ | |
226 | date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec); | |
227 | date[RX8025_REG_MIN] = bin2bcd(dt->tm_min); | |
228 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
229 | date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour); | |
230 | else | |
231 | date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) | |
232 | | bin2bcd((dt->tm_hour + 11) % 12 + 1); | |
233 | ||
234 | date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday); | |
235 | date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday); | |
236 | date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1); | |
32672c55 | 237 | date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100); |
3c2b9075 WG |
238 | |
239 | dev_dbg(dev, | |
240 | "%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", | |
241 | __func__, | |
242 | date[0], date[1], date[2], date[3], date[4], date[5], date[6]); | |
243 | ||
244 | return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date); | |
245 | } | |
246 | ||
6f0a8cfe | 247 | static int rx8025_init_client(struct i2c_client *client) |
3c2b9075 WG |
248 | { |
249 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
250 | u8 ctrl[2], ctrl2; | |
251 | int need_clear = 0; | |
252 | int err; | |
253 | ||
254 | err = rx8025_read_regs(rx8025->client, RX8025_REG_CTRL1, 2, ctrl); | |
255 | if (err) | |
256 | goto out; | |
257 | ||
258 | /* Keep test bit zero ! */ | |
259 | rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST; | |
260 | ||
261 | if (ctrl[1] & RX8025_BIT_CTRL2_PON) { | |
262 | dev_warn(&client->dev, "power-on reset was detected, " | |
263 | "you may have to readjust the clock\n"); | |
6f0a8cfe | 264 | need_clear = 1; |
3c2b9075 WG |
265 | } |
266 | ||
267 | if (ctrl[1] & RX8025_BIT_CTRL2_VDET) { | |
268 | dev_warn(&client->dev, "a power voltage drop was detected, " | |
269 | "you may have to readjust the clock\n"); | |
6f0a8cfe | 270 | need_clear = 1; |
3c2b9075 WG |
271 | } |
272 | ||
273 | if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) { | |
274 | dev_warn(&client->dev, "Oscillation stop was detected," | |
275 | "you may have to readjust the clock\n"); | |
6f0a8cfe | 276 | need_clear = 1; |
3c2b9075 WG |
277 | } |
278 | ||
279 | if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) { | |
280 | dev_warn(&client->dev, "Alarm was detected\n"); | |
281 | need_clear = 1; | |
282 | } | |
283 | ||
284 | if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG)) | |
285 | need_clear = 1; | |
286 | ||
6f0a8cfe | 287 | if (need_clear) { |
3c2b9075 WG |
288 | ctrl2 = ctrl[0]; |
289 | ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET | | |
290 | RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG | | |
291 | RX8025_BIT_CTRL2_DAFG); | |
292 | ctrl2 |= RX8025_BIT_CTRL2_XST; | |
293 | ||
294 | err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); | |
295 | } | |
296 | out: | |
297 | return err; | |
298 | } | |
299 | ||
300 | /* Alarm support */ | |
301 | static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
302 | { | |
303 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
304 | struct i2c_client *client = rx8025->client; | |
305 | u8 ctrl2, ald[2]; | |
306 | int err; | |
307 | ||
308 | if (client->irq <= 0) | |
309 | return -EINVAL; | |
310 | ||
311 | err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald); | |
312 | if (err) | |
313 | return err; | |
314 | ||
315 | err = rx8025_read_reg(client, RX8025_REG_CTRL2, &ctrl2); | |
316 | if (err) | |
317 | return err; | |
318 | ||
319 | dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n", | |
320 | __func__, ald[0], ald[1], ctrl2); | |
321 | ||
322 | /* Hardware alarms precision is 1 minute! */ | |
323 | t->time.tm_sec = 0; | |
324 | t->time.tm_min = bcd2bin(ald[0] & 0x7f); | |
325 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
326 | t->time.tm_hour = bcd2bin(ald[1] & 0x3f); | |
327 | else | |
328 | t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12 | |
329 | + (ald[1] & 0x20 ? 12 : 0); | |
330 | ||
331 | t->time.tm_wday = -1; | |
332 | t->time.tm_mday = -1; | |
333 | t->time.tm_mon = -1; | |
334 | t->time.tm_year = -1; | |
335 | ||
336 | dev_dbg(dev, "%s: date: %ds %dm %dh %dmd %dm %dy\n", | |
337 | __func__, | |
338 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
339 | t->time.tm_mday, t->time.tm_mon, t->time.tm_year); | |
340 | t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE); | |
341 | t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled; | |
342 | ||
343 | return err; | |
344 | } | |
345 | ||
346 | static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
347 | { | |
348 | struct i2c_client *client = to_i2c_client(dev); | |
349 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
350 | u8 ald[2]; | |
351 | int err; | |
352 | ||
353 | if (client->irq <= 0) | |
354 | return -EINVAL; | |
355 | ||
356 | /* Hardware alarm precision is 1 minute! */ | |
357 | ald[0] = bin2bcd(t->time.tm_min); | |
358 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
359 | ald[1] = bin2bcd(t->time.tm_hour); | |
360 | else | |
361 | ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0) | |
362 | | bin2bcd((t->time.tm_hour + 11) % 12 + 1); | |
363 | ||
364 | dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]); | |
365 | ||
366 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) { | |
367 | rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE; | |
368 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
369 | rx8025->ctrl1); | |
370 | if (err) | |
371 | return err; | |
372 | } | |
373 | err = rx8025_write_regs(rx8025->client, RX8025_REG_ALDMIN, 2, ald); | |
374 | if (err) | |
375 | return err; | |
376 | ||
377 | if (t->enabled) { | |
378 | rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE; | |
379 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
380 | rx8025->ctrl1); | |
381 | if (err) | |
382 | return err; | |
383 | } | |
384 | ||
385 | return 0; | |
386 | } | |
387 | ||
388 | static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
389 | { | |
390 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
391 | u8 ctrl1; | |
392 | int err; | |
393 | ||
394 | ctrl1 = rx8025->ctrl1; | |
395 | if (enabled) | |
396 | ctrl1 |= RX8025_BIT_CTRL1_DALE; | |
397 | else | |
398 | ctrl1 &= ~RX8025_BIT_CTRL1_DALE; | |
399 | ||
400 | if (ctrl1 != rx8025->ctrl1) { | |
401 | rx8025->ctrl1 = ctrl1; | |
402 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
403 | rx8025->ctrl1); | |
404 | if (err) | |
405 | return err; | |
406 | } | |
407 | return 0; | |
408 | } | |
409 | ||
3c2b9075 WG |
410 | static struct rtc_class_ops rx8025_rtc_ops = { |
411 | .read_time = rx8025_get_time, | |
412 | .set_time = rx8025_set_time, | |
413 | .read_alarm = rx8025_read_alarm, | |
414 | .set_alarm = rx8025_set_alarm, | |
415 | .alarm_irq_enable = rx8025_alarm_irq_enable, | |
3c2b9075 WG |
416 | }; |
417 | ||
418 | /* | |
419 | * Clock precision adjustment support | |
420 | * | |
421 | * According to the RX8025 SA/NB application manual the frequency and | |
b770ffd4 | 422 | * temperature characteristics can be approximated using the following |
3c2b9075 WG |
423 | * equation: |
424 | * | |
425 | * df = a * (ut - t)**2 | |
426 | * | |
427 | * df: Frequency deviation in any temperature | |
428 | * a : Coefficient = (-35 +-5) * 10**-9 | |
429 | * ut: Ultimate temperature in degree = +25 +-5 degree | |
430 | * t : Any temperature in degree | |
431 | * | |
432 | * Note that the clock adjustment in ppb must be entered (which is | |
433 | * the negative value of the deviation). | |
434 | */ | |
435 | static int rx8025_get_clock_adjust(struct device *dev, int *adj) | |
436 | { | |
437 | struct i2c_client *client = to_i2c_client(dev); | |
438 | u8 digoff; | |
439 | int err; | |
440 | ||
441 | err = rx8025_read_reg(client, RX8025_REG_DIGOFF, &digoff); | |
442 | if (err) | |
443 | return err; | |
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); |
3c2b9075 | 535 | if (!rx8025) { |
dbcce7cf | 536 | return -ENOMEM; |
3c2b9075 WG |
537 | } |
538 | ||
539 | rx8025->client = client; | |
540 | i2c_set_clientdata(client, rx8025); | |
3c2b9075 | 541 | |
6f0a8cfe | 542 | err = rx8025_init_client(client); |
3c2b9075 | 543 | if (err) |
dbcce7cf | 544 | return err; |
3c2b9075 | 545 | |
fac42b41 | 546 | rx8025->rtc = devm_rtc_device_register(&client->dev, client->name, |
3c2b9075 WG |
547 | &rx8025_rtc_ops, THIS_MODULE); |
548 | if (IS_ERR(rx8025->rtc)) { | |
3c2b9075 | 549 | dev_err(&client->dev, "unable to register the class device\n"); |
dbcce7cf | 550 | return PTR_ERR(rx8025->rtc); |
3c2b9075 WG |
551 | } |
552 | ||
553 | if (client->irq > 0) { | |
554 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); | |
f0b63a1d AB |
555 | err = devm_request_threaded_irq(&client->dev, client->irq, NULL, |
556 | rx8025_handle_irq, 0, "rx8025", | |
557 | client); | |
3c2b9075 WG |
558 | if (err) { |
559 | dev_err(&client->dev, "unable to request IRQ\n"); | |
dbcce7cf | 560 | return err; |
3c2b9075 WG |
561 | } |
562 | } | |
563 | ||
564 | rx8025->rtc->irq_freq = 1; | |
565 | rx8025->rtc->max_user_freq = 1; | |
566 | ||
567 | err = rx8025_sysfs_register(&client->dev); | |
3c2b9075 WG |
568 | return err; |
569 | } | |
570 | ||
5a167f45 | 571 | static int rx8025_remove(struct i2c_client *client) |
3c2b9075 | 572 | { |
3c2b9075 | 573 | rx8025_sysfs_unregister(&client->dev); |
3c2b9075 WG |
574 | return 0; |
575 | } | |
576 | ||
577 | static struct i2c_driver rx8025_driver = { | |
578 | .driver = { | |
579 | .name = "rtc-rx8025", | |
3c2b9075 WG |
580 | }, |
581 | .probe = rx8025_probe, | |
5a167f45 | 582 | .remove = rx8025_remove, |
3c2b9075 WG |
583 | .id_table = rx8025_id, |
584 | }; | |
585 | ||
0abc9201 | 586 | module_i2c_driver(rx8025_driver); |
3c2b9075 WG |
587 | |
588 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
589 | MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver"); | |
590 | MODULE_LICENSE("GPL"); |