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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 | */ | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/bcd.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/rtc.h> | |
28 | ||
29 | /* Register definitions */ | |
30 | #define RX8025_REG_SEC 0x00 | |
31 | #define RX8025_REG_MIN 0x01 | |
32 | #define RX8025_REG_HOUR 0x02 | |
33 | #define RX8025_REG_WDAY 0x03 | |
34 | #define RX8025_REG_MDAY 0x04 | |
35 | #define RX8025_REG_MONTH 0x05 | |
36 | #define RX8025_REG_YEAR 0x06 | |
37 | #define RX8025_REG_DIGOFF 0x07 | |
38 | #define RX8025_REG_ALWMIN 0x08 | |
39 | #define RX8025_REG_ALWHOUR 0x09 | |
40 | #define RX8025_REG_ALWWDAY 0x0a | |
41 | #define RX8025_REG_ALDMIN 0x0b | |
42 | #define RX8025_REG_ALDHOUR 0x0c | |
43 | /* 0x0d is reserved */ | |
44 | #define RX8025_REG_CTRL1 0x0e | |
45 | #define RX8025_REG_CTRL2 0x0f | |
46 | ||
47 | #define RX8025_BIT_CTRL1_CT (7 << 0) | |
48 | /* 1 Hz periodic level irq */ | |
49 | #define RX8025_BIT_CTRL1_CT_1HZ 4 | |
50 | #define RX8025_BIT_CTRL1_TEST (1 << 3) | |
51 | #define RX8025_BIT_CTRL1_1224 (1 << 5) | |
52 | #define RX8025_BIT_CTRL1_DALE (1 << 6) | |
53 | #define RX8025_BIT_CTRL1_WALE (1 << 7) | |
54 | ||
55 | #define RX8025_BIT_CTRL2_DAFG (1 << 0) | |
56 | #define RX8025_BIT_CTRL2_WAFG (1 << 1) | |
57 | #define RX8025_BIT_CTRL2_CTFG (1 << 2) | |
58 | #define RX8025_BIT_CTRL2_PON (1 << 4) | |
59 | #define RX8025_BIT_CTRL2_XST (1 << 5) | |
60 | #define RX8025_BIT_CTRL2_VDET (1 << 6) | |
61 | ||
62 | /* Clock precision adjustment */ | |
63 | #define RX8025_ADJ_RESOLUTION 3050 /* in ppb */ | |
64 | #define RX8025_ADJ_DATA_MAX 62 | |
65 | #define RX8025_ADJ_DATA_MIN -62 | |
66 | ||
67 | static const struct i2c_device_id rx8025_id[] = { | |
68 | { "rx8025", 0 }, | |
69 | { } | |
70 | }; | |
71 | MODULE_DEVICE_TABLE(i2c, rx8025_id); | |
72 | ||
73 | struct rx8025_data { | |
74 | struct i2c_client *client; | |
75 | struct rtc_device *rtc; | |
76 | struct work_struct work; | |
77 | u8 ctrl1; | |
78 | unsigned exiting:1; | |
79 | }; | |
80 | ||
81 | static int rx8025_read_reg(struct i2c_client *client, int number, u8 *value) | |
82 | { | |
83 | int ret = i2c_smbus_read_byte_data(client, (number << 4) | 0x08); | |
84 | ||
85 | if (ret < 0) { | |
86 | dev_err(&client->dev, "Unable to read register #%d\n", number); | |
87 | return ret; | |
88 | } | |
89 | ||
90 | *value = ret; | |
91 | return 0; | |
92 | } | |
93 | ||
94 | static int rx8025_read_regs(struct i2c_client *client, | |
95 | int number, u8 length, u8 *values) | |
96 | { | |
97 | int ret = i2c_smbus_read_i2c_block_data(client, (number << 4) | 0x08, | |
98 | length, values); | |
99 | ||
100 | if (ret != length) { | |
101 | dev_err(&client->dev, "Unable to read registers #%d..#%d\n", | |
102 | number, number + length - 1); | |
103 | return ret < 0 ? ret : -EIO; | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int rx8025_write_reg(struct i2c_client *client, int number, u8 value) | |
110 | { | |
111 | int ret = i2c_smbus_write_byte_data(client, number << 4, value); | |
112 | ||
113 | if (ret) | |
114 | dev_err(&client->dev, "Unable to write register #%d\n", | |
115 | number); | |
116 | ||
117 | return ret; | |
118 | } | |
119 | ||
120 | static int rx8025_write_regs(struct i2c_client *client, | |
121 | int number, u8 length, u8 *values) | |
122 | { | |
123 | int ret = i2c_smbus_write_i2c_block_data(client, (number << 4) | 0x08, | |
124 | length, values); | |
125 | ||
126 | if (ret) | |
127 | dev_err(&client->dev, "Unable to write registers #%d..#%d\n", | |
128 | number, number + length - 1); | |
129 | ||
130 | return ret; | |
131 | } | |
132 | ||
133 | static irqreturn_t rx8025_irq(int irq, void *dev_id) | |
134 | { | |
135 | struct i2c_client *client = dev_id; | |
136 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
137 | ||
138 | disable_irq_nosync(irq); | |
139 | schedule_work(&rx8025->work); | |
140 | return IRQ_HANDLED; | |
141 | } | |
142 | ||
143 | static void rx8025_work(struct work_struct *work) | |
144 | { | |
145 | struct rx8025_data *rx8025 = container_of(work, struct rx8025_data, | |
146 | work); | |
147 | struct i2c_client *client = rx8025->client; | |
148 | struct mutex *lock = &rx8025->rtc->ops_lock; | |
149 | u8 status; | |
150 | ||
151 | mutex_lock(lock); | |
152 | ||
153 | if (rx8025_read_reg(client, RX8025_REG_CTRL2, &status)) | |
154 | goto out; | |
155 | ||
156 | if (!(status & RX8025_BIT_CTRL2_XST)) | |
157 | dev_warn(&client->dev, "Oscillation stop was detected," | |
158 | "you may have to readjust the clock\n"); | |
159 | ||
160 | if (status & RX8025_BIT_CTRL2_CTFG) { | |
161 | /* periodic */ | |
162 | status &= ~RX8025_BIT_CTRL2_CTFG; | |
163 | local_irq_disable(); | |
164 | rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); | |
165 | local_irq_enable(); | |
166 | } | |
167 | ||
168 | if (status & RX8025_BIT_CTRL2_DAFG) { | |
169 | /* alarm */ | |
170 | status &= RX8025_BIT_CTRL2_DAFG; | |
171 | if (rx8025_write_reg(client, RX8025_REG_CTRL1, | |
172 | rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE)) | |
173 | goto out; | |
174 | local_irq_disable(); | |
175 | rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); | |
176 | local_irq_enable(); | |
177 | } | |
178 | ||
179 | /* acknowledge IRQ */ | |
180 | rx8025_write_reg(client, RX8025_REG_CTRL2, | |
181 | status | RX8025_BIT_CTRL2_XST); | |
182 | ||
183 | out: | |
184 | if (!rx8025->exiting) | |
185 | enable_irq(client->irq); | |
186 | ||
187 | mutex_unlock(lock); | |
188 | } | |
189 | ||
190 | static int rx8025_get_time(struct device *dev, struct rtc_time *dt) | |
191 | { | |
192 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
193 | u8 date[7]; | |
194 | int err; | |
195 | ||
196 | err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date); | |
197 | if (err) | |
198 | return err; | |
199 | ||
200 | dev_dbg(dev, "%s: read 0x%02x 0x%02x " | |
201 | "0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__, | |
202 | date[0], date[1], date[2], date[3], date[4], | |
203 | date[5], date[6]); | |
204 | ||
205 | dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f); | |
206 | dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f); | |
207 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
208 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f); | |
209 | else | |
210 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12 | |
211 | + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0); | |
212 | ||
213 | dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f); | |
214 | dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1; | |
215 | dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]); | |
216 | ||
217 | if (dt->tm_year < 70) | |
218 | dt->tm_year += 100; | |
219 | ||
220 | dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__, | |
221 | dt->tm_sec, dt->tm_min, dt->tm_hour, | |
222 | dt->tm_mday, dt->tm_mon, dt->tm_year); | |
223 | ||
224 | return rtc_valid_tm(dt); | |
225 | } | |
226 | ||
227 | static int rx8025_set_time(struct device *dev, struct rtc_time *dt) | |
228 | { | |
229 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
230 | u8 date[7]; | |
231 | ||
232 | /* | |
233 | * BUG: The HW assumes every year that is a multiple of 4 to be a leap | |
234 | * year. Next time this is wrong is 2100, which will not be a leap | |
235 | * year. | |
236 | */ | |
237 | ||
238 | /* | |
239 | * Here the read-only bits are written as "0". I'm not sure if that | |
240 | * is sound. | |
241 | */ | |
242 | date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec); | |
243 | date[RX8025_REG_MIN] = bin2bcd(dt->tm_min); | |
244 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
245 | date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour); | |
246 | else | |
247 | date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) | |
248 | | bin2bcd((dt->tm_hour + 11) % 12 + 1); | |
249 | ||
250 | date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday); | |
251 | date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday); | |
252 | date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1); | |
253 | date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100); | |
254 | ||
255 | dev_dbg(dev, | |
256 | "%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", | |
257 | __func__, | |
258 | date[0], date[1], date[2], date[3], date[4], date[5], date[6]); | |
259 | ||
260 | return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date); | |
261 | } | |
262 | ||
263 | static int rx8025_init_client(struct i2c_client *client, int *need_reset) | |
264 | { | |
265 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
266 | u8 ctrl[2], ctrl2; | |
267 | int need_clear = 0; | |
268 | int err; | |
269 | ||
270 | err = rx8025_read_regs(rx8025->client, RX8025_REG_CTRL1, 2, ctrl); | |
271 | if (err) | |
272 | goto out; | |
273 | ||
274 | /* Keep test bit zero ! */ | |
275 | rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST; | |
276 | ||
277 | if (ctrl[1] & RX8025_BIT_CTRL2_PON) { | |
278 | dev_warn(&client->dev, "power-on reset was detected, " | |
279 | "you may have to readjust the clock\n"); | |
280 | *need_reset = 1; | |
281 | } | |
282 | ||
283 | if (ctrl[1] & RX8025_BIT_CTRL2_VDET) { | |
284 | dev_warn(&client->dev, "a power voltage drop was detected, " | |
285 | "you may have to readjust the clock\n"); | |
286 | *need_reset = 1; | |
287 | } | |
288 | ||
289 | if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) { | |
290 | dev_warn(&client->dev, "Oscillation stop was detected," | |
291 | "you may have to readjust the clock\n"); | |
292 | *need_reset = 1; | |
293 | } | |
294 | ||
295 | if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) { | |
296 | dev_warn(&client->dev, "Alarm was detected\n"); | |
297 | need_clear = 1; | |
298 | } | |
299 | ||
300 | if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG)) | |
301 | need_clear = 1; | |
302 | ||
303 | if (*need_reset || need_clear) { | |
304 | ctrl2 = ctrl[0]; | |
305 | ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET | | |
306 | RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG | | |
307 | RX8025_BIT_CTRL2_DAFG); | |
308 | ctrl2 |= RX8025_BIT_CTRL2_XST; | |
309 | ||
310 | err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); | |
311 | } | |
312 | out: | |
313 | return err; | |
314 | } | |
315 | ||
316 | /* Alarm support */ | |
317 | static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
318 | { | |
319 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
320 | struct i2c_client *client = rx8025->client; | |
321 | u8 ctrl2, ald[2]; | |
322 | int err; | |
323 | ||
324 | if (client->irq <= 0) | |
325 | return -EINVAL; | |
326 | ||
327 | err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald); | |
328 | if (err) | |
329 | return err; | |
330 | ||
331 | err = rx8025_read_reg(client, RX8025_REG_CTRL2, &ctrl2); | |
332 | if (err) | |
333 | return err; | |
334 | ||
335 | dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n", | |
336 | __func__, ald[0], ald[1], ctrl2); | |
337 | ||
338 | /* Hardware alarms precision is 1 minute! */ | |
339 | t->time.tm_sec = 0; | |
340 | t->time.tm_min = bcd2bin(ald[0] & 0x7f); | |
341 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
342 | t->time.tm_hour = bcd2bin(ald[1] & 0x3f); | |
343 | else | |
344 | t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12 | |
345 | + (ald[1] & 0x20 ? 12 : 0); | |
346 | ||
347 | t->time.tm_wday = -1; | |
348 | t->time.tm_mday = -1; | |
349 | t->time.tm_mon = -1; | |
350 | t->time.tm_year = -1; | |
351 | ||
352 | dev_dbg(dev, "%s: date: %ds %dm %dh %dmd %dm %dy\n", | |
353 | __func__, | |
354 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
355 | t->time.tm_mday, t->time.tm_mon, t->time.tm_year); | |
356 | t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE); | |
357 | t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled; | |
358 | ||
359 | return err; | |
360 | } | |
361 | ||
362 | static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
363 | { | |
364 | struct i2c_client *client = to_i2c_client(dev); | |
365 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
366 | u8 ald[2]; | |
367 | int err; | |
368 | ||
369 | if (client->irq <= 0) | |
370 | return -EINVAL; | |
371 | ||
372 | /* Hardware alarm precision is 1 minute! */ | |
373 | ald[0] = bin2bcd(t->time.tm_min); | |
374 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) | |
375 | ald[1] = bin2bcd(t->time.tm_hour); | |
376 | else | |
377 | ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0) | |
378 | | bin2bcd((t->time.tm_hour + 11) % 12 + 1); | |
379 | ||
380 | dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]); | |
381 | ||
382 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) { | |
383 | rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE; | |
384 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
385 | rx8025->ctrl1); | |
386 | if (err) | |
387 | return err; | |
388 | } | |
389 | err = rx8025_write_regs(rx8025->client, RX8025_REG_ALDMIN, 2, ald); | |
390 | if (err) | |
391 | return err; | |
392 | ||
393 | if (t->enabled) { | |
394 | rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE; | |
395 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
396 | rx8025->ctrl1); | |
397 | if (err) | |
398 | return err; | |
399 | } | |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
404 | static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
405 | { | |
406 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); | |
407 | u8 ctrl1; | |
408 | int err; | |
409 | ||
410 | ctrl1 = rx8025->ctrl1; | |
411 | if (enabled) | |
412 | ctrl1 |= RX8025_BIT_CTRL1_DALE; | |
413 | else | |
414 | ctrl1 &= ~RX8025_BIT_CTRL1_DALE; | |
415 | ||
416 | if (ctrl1 != rx8025->ctrl1) { | |
417 | rx8025->ctrl1 = ctrl1; | |
418 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
419 | rx8025->ctrl1); | |
420 | if (err) | |
421 | return err; | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int rx8025_irq_set_state(struct device *dev, int enabled) | |
427 | { | |
428 | struct i2c_client *client = to_i2c_client(dev); | |
429 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
430 | int ctrl1; | |
431 | int err; | |
432 | ||
433 | if (client->irq <= 0) | |
434 | return -ENXIO; | |
435 | ||
436 | ctrl1 = rx8025->ctrl1 & ~RX8025_BIT_CTRL1_CT; | |
437 | if (enabled) | |
438 | ctrl1 |= RX8025_BIT_CTRL1_CT_1HZ; | |
439 | if (ctrl1 != rx8025->ctrl1) { | |
440 | rx8025->ctrl1 = ctrl1; | |
441 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, | |
442 | rx8025->ctrl1); | |
443 | if (err) | |
444 | return err; | |
445 | } | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | static struct rtc_class_ops rx8025_rtc_ops = { | |
451 | .read_time = rx8025_get_time, | |
452 | .set_time = rx8025_set_time, | |
453 | .read_alarm = rx8025_read_alarm, | |
454 | .set_alarm = rx8025_set_alarm, | |
455 | .alarm_irq_enable = rx8025_alarm_irq_enable, | |
456 | .irq_set_state = rx8025_irq_set_state, | |
457 | }; | |
458 | ||
459 | /* | |
460 | * Clock precision adjustment support | |
461 | * | |
462 | * According to the RX8025 SA/NB application manual the frequency and | |
463 | * temperature charateristics can be approximated using the following | |
464 | * equation: | |
465 | * | |
466 | * df = a * (ut - t)**2 | |
467 | * | |
468 | * df: Frequency deviation in any temperature | |
469 | * a : Coefficient = (-35 +-5) * 10**-9 | |
470 | * ut: Ultimate temperature in degree = +25 +-5 degree | |
471 | * t : Any temperature in degree | |
472 | * | |
473 | * Note that the clock adjustment in ppb must be entered (which is | |
474 | * the negative value of the deviation). | |
475 | */ | |
476 | static int rx8025_get_clock_adjust(struct device *dev, int *adj) | |
477 | { | |
478 | struct i2c_client *client = to_i2c_client(dev); | |
479 | u8 digoff; | |
480 | int err; | |
481 | ||
482 | err = rx8025_read_reg(client, RX8025_REG_DIGOFF, &digoff); | |
483 | if (err) | |
484 | return err; | |
485 | ||
486 | *adj = digoff >= 64 ? digoff - 128 : digoff; | |
487 | if (*adj > 0) | |
488 | (*adj)--; | |
489 | *adj *= -RX8025_ADJ_RESOLUTION; | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
494 | static int rx8025_set_clock_adjust(struct device *dev, int adj) | |
495 | { | |
496 | struct i2c_client *client = to_i2c_client(dev); | |
497 | u8 digoff; | |
498 | int err; | |
499 | ||
500 | adj /= -RX8025_ADJ_RESOLUTION; | |
501 | if (adj > RX8025_ADJ_DATA_MAX) | |
502 | adj = RX8025_ADJ_DATA_MAX; | |
503 | else if (adj < RX8025_ADJ_DATA_MIN) | |
504 | adj = RX8025_ADJ_DATA_MIN; | |
505 | else if (adj > 0) | |
506 | adj++; | |
507 | else if (adj < 0) | |
508 | adj += 128; | |
509 | digoff = adj; | |
510 | ||
511 | err = rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff); | |
512 | if (err) | |
513 | return err; | |
514 | ||
515 | dev_dbg(dev, "%s: write 0x%02x\n", __func__, digoff); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev, | |
521 | struct device_attribute *attr, | |
522 | char *buf) | |
523 | { | |
524 | int err, adj; | |
525 | ||
526 | err = rx8025_get_clock_adjust(dev, &adj); | |
527 | if (err) | |
528 | return err; | |
529 | ||
530 | return sprintf(buf, "%d\n", adj); | |
531 | } | |
532 | ||
533 | static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev, | |
534 | struct device_attribute *attr, | |
535 | const char *buf, size_t count) | |
536 | { | |
537 | int adj, err; | |
538 | ||
539 | if (sscanf(buf, "%i", &adj) != 1) | |
540 | return -EINVAL; | |
541 | ||
542 | err = rx8025_set_clock_adjust(dev, adj); | |
543 | ||
544 | return err ? err : count; | |
545 | } | |
546 | ||
547 | static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR, | |
548 | rx8025_sysfs_show_clock_adjust, | |
549 | rx8025_sysfs_store_clock_adjust); | |
550 | ||
551 | static int rx8025_sysfs_register(struct device *dev) | |
552 | { | |
553 | return device_create_file(dev, &dev_attr_clock_adjust_ppb); | |
554 | } | |
555 | ||
556 | static void rx8025_sysfs_unregister(struct device *dev) | |
557 | { | |
558 | device_remove_file(dev, &dev_attr_clock_adjust_ppb); | |
559 | } | |
560 | ||
561 | static int __devinit rx8025_probe(struct i2c_client *client, | |
562 | const struct i2c_device_id *id) | |
563 | { | |
564 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
565 | struct rx8025_data *rx8025; | |
566 | int err, need_reset = 0; | |
567 | ||
568 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
569 | | I2C_FUNC_SMBUS_I2C_BLOCK)) { | |
570 | dev_err(&adapter->dev, | |
571 | "doesn't support required functionality\n"); | |
572 | err = -EIO; | |
573 | goto errout; | |
574 | } | |
575 | ||
576 | rx8025 = kzalloc(sizeof(*rx8025), GFP_KERNEL); | |
577 | if (!rx8025) { | |
578 | dev_err(&adapter->dev, "failed to alloc memory\n"); | |
579 | err = -ENOMEM; | |
580 | goto errout; | |
581 | } | |
582 | ||
583 | rx8025->client = client; | |
584 | i2c_set_clientdata(client, rx8025); | |
585 | INIT_WORK(&rx8025->work, rx8025_work); | |
586 | ||
587 | err = rx8025_init_client(client, &need_reset); | |
588 | if (err) | |
589 | goto errout_free; | |
590 | ||
591 | if (need_reset) { | |
592 | struct rtc_time tm; | |
593 | dev_info(&client->dev, | |
594 | "bad conditions detected, resetting date\n"); | |
595 | rtc_time_to_tm(0, &tm); /* 1970/1/1 */ | |
596 | rx8025_set_time(&client->dev, &tm); | |
597 | } | |
598 | ||
599 | rx8025->rtc = rtc_device_register(client->name, &client->dev, | |
600 | &rx8025_rtc_ops, THIS_MODULE); | |
601 | if (IS_ERR(rx8025->rtc)) { | |
602 | err = PTR_ERR(rx8025->rtc); | |
603 | dev_err(&client->dev, "unable to register the class device\n"); | |
604 | goto errout_free; | |
605 | } | |
606 | ||
607 | if (client->irq > 0) { | |
608 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); | |
609 | err = request_irq(client->irq, rx8025_irq, | |
610 | 0, "rx8025", client); | |
611 | if (err) { | |
612 | dev_err(&client->dev, "unable to request IRQ\n"); | |
613 | goto errout_reg; | |
614 | } | |
615 | } | |
616 | ||
617 | rx8025->rtc->irq_freq = 1; | |
618 | rx8025->rtc->max_user_freq = 1; | |
619 | ||
620 | err = rx8025_sysfs_register(&client->dev); | |
621 | if (err) | |
622 | goto errout_irq; | |
623 | ||
624 | return 0; | |
625 | ||
626 | errout_irq: | |
627 | if (client->irq > 0) | |
628 | free_irq(client->irq, client); | |
629 | ||
630 | errout_reg: | |
631 | rtc_device_unregister(rx8025->rtc); | |
632 | ||
633 | errout_free: | |
634 | i2c_set_clientdata(client, NULL); | |
635 | kfree(rx8025); | |
636 | ||
637 | errout: | |
638 | dev_err(&adapter->dev, "probing for rx8025 failed\n"); | |
639 | return err; | |
640 | } | |
641 | ||
642 | static int __devexit rx8025_remove(struct i2c_client *client) | |
643 | { | |
644 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); | |
645 | struct mutex *lock = &rx8025->rtc->ops_lock; | |
646 | ||
647 | if (client->irq > 0) { | |
648 | mutex_lock(lock); | |
649 | rx8025->exiting = 1; | |
650 | mutex_unlock(lock); | |
651 | ||
652 | free_irq(client->irq, client); | |
653 | flush_scheduled_work(); | |
654 | } | |
655 | ||
656 | rx8025_sysfs_unregister(&client->dev); | |
657 | rtc_device_unregister(rx8025->rtc); | |
658 | i2c_set_clientdata(client, NULL); | |
659 | kfree(rx8025); | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static struct i2c_driver rx8025_driver = { | |
664 | .driver = { | |
665 | .name = "rtc-rx8025", | |
666 | .owner = THIS_MODULE, | |
667 | }, | |
668 | .probe = rx8025_probe, | |
669 | .remove = __devexit_p(rx8025_remove), | |
670 | .id_table = rx8025_id, | |
671 | }; | |
672 | ||
673 | static int __init rx8025_init(void) | |
674 | { | |
675 | return i2c_add_driver(&rx8025_driver); | |
676 | } | |
677 | ||
678 | static void __exit rx8025_exit(void) | |
679 | { | |
680 | i2c_del_driver(&rx8025_driver); | |
681 | } | |
682 | ||
683 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); | |
684 | MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver"); | |
685 | MODULE_LICENSE("GPL"); | |
686 | ||
687 | module_init(rx8025_init); | |
688 | module_exit(rx8025_exit); |