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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/slab.h> |
24 | #include <linux/init.h> |
25 | #include <linux/bcd.h> |
26 | #include <linux/i2c.h> |
27 | #include <linux/list.h> |
28 | #include <linux/rtc.h> |
29 | |
30 | /* Register definitions */ |
31 | #define RX8025_REG_SEC 0x00 |
32 | #define RX8025_REG_MIN 0x01 |
33 | #define RX8025_REG_HOUR 0x02 |
34 | #define RX8025_REG_WDAY 0x03 |
35 | #define RX8025_REG_MDAY 0x04 |
36 | #define RX8025_REG_MONTH 0x05 |
37 | #define RX8025_REG_YEAR 0x06 |
38 | #define RX8025_REG_DIGOFF 0x07 |
39 | #define RX8025_REG_ALWMIN 0x08 |
40 | #define RX8025_REG_ALWHOUR 0x09 |
41 | #define RX8025_REG_ALWWDAY 0x0a |
42 | #define RX8025_REG_ALDMIN 0x0b |
43 | #define RX8025_REG_ALDHOUR 0x0c |
44 | /* 0x0d is reserved */ |
45 | #define RX8025_REG_CTRL1 0x0e |
46 | #define RX8025_REG_CTRL2 0x0f |
47 | |
48 | #define RX8025_BIT_CTRL1_CT (7 << 0) |
49 | /* 1 Hz periodic level irq */ |
50 | #define RX8025_BIT_CTRL1_CT_1HZ 4 |
51 | #define RX8025_BIT_CTRL1_TEST (1 << 3) |
52 | #define RX8025_BIT_CTRL1_1224 (1 << 5) |
53 | #define RX8025_BIT_CTRL1_DALE (1 << 6) |
54 | #define RX8025_BIT_CTRL1_WALE (1 << 7) |
55 | |
56 | #define RX8025_BIT_CTRL2_DAFG (1 << 0) |
57 | #define RX8025_BIT_CTRL2_WAFG (1 << 1) |
58 | #define RX8025_BIT_CTRL2_CTFG (1 << 2) |
59 | #define RX8025_BIT_CTRL2_PON (1 << 4) |
60 | #define RX8025_BIT_CTRL2_XST (1 << 5) |
61 | #define RX8025_BIT_CTRL2_VDET (1 << 6) |
62 | |
63 | /* Clock precision adjustment */ |
64 | #define RX8025_ADJ_RESOLUTION 3050 /* in ppb */ |
65 | #define RX8025_ADJ_DATA_MAX 62 |
66 | #define RX8025_ADJ_DATA_MIN -62 |
67 | |
68 | static const struct i2c_device_id rx8025_id[] = { |
69 | { "rx8025", 0 }, |
70 | { } |
71 | }; |
72 | MODULE_DEVICE_TABLE(i2c, rx8025_id); |
73 | |
74 | struct rx8025_data { |
75 | struct i2c_client *client; |
76 | struct rtc_device *rtc; |
77 | struct work_struct work; |
78 | u8 ctrl1; |
79 | unsigned exiting:1; |
80 | }; |
81 | |
82 | static int rx8025_read_reg(struct i2c_client *client, int number, u8 *value) |
83 | { |
84 | int ret = i2c_smbus_read_byte_data(client, (number << 4) | 0x08); |
85 | |
86 | if (ret < 0) { |
87 | dev_err(&client->dev, "Unable to read register #%d\n", number); |
88 | return ret; |
89 | } |
90 | |
91 | *value = ret; |
92 | return 0; |
93 | } |
94 | |
95 | static int rx8025_read_regs(struct i2c_client *client, |
96 | int number, u8 length, u8 *values) |
97 | { |
98 | int ret = i2c_smbus_read_i2c_block_data(client, (number << 4) | 0x08, |
99 | length, values); |
100 | |
101 | if (ret != length) { |
102 | dev_err(&client->dev, "Unable to read registers #%d..#%d\n", |
103 | number, number + length - 1); |
104 | return ret < 0 ? ret : -EIO; |
105 | } |
106 | |
107 | return 0; |
108 | } |
109 | |
110 | static int rx8025_write_reg(struct i2c_client *client, int number, u8 value) |
111 | { |
112 | int ret = i2c_smbus_write_byte_data(client, number << 4, value); |
113 | |
114 | if (ret) |
115 | dev_err(&client->dev, "Unable to write register #%d\n", |
116 | number); |
117 | |
118 | return ret; |
119 | } |
120 | |
121 | static int rx8025_write_regs(struct i2c_client *client, |
122 | int number, u8 length, u8 *values) |
123 | { |
124 | int ret = i2c_smbus_write_i2c_block_data(client, (number << 4) | 0x08, |
125 | length, values); |
126 | |
127 | if (ret) |
128 | dev_err(&client->dev, "Unable to write registers #%d..#%d\n", |
129 | number, number + length - 1); |
130 | |
131 | return ret; |
132 | } |
133 | |
134 | static irqreturn_t rx8025_irq(int irq, void *dev_id) |
135 | { |
136 | struct i2c_client *client = dev_id; |
137 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); |
138 | |
139 | disable_irq_nosync(irq); |
140 | schedule_work(&rx8025->work); |
141 | return IRQ_HANDLED; |
142 | } |
143 | |
144 | static void rx8025_work(struct work_struct *work) |
145 | { |
146 | struct rx8025_data *rx8025 = container_of(work, struct rx8025_data, |
147 | work); |
148 | struct i2c_client *client = rx8025->client; |
149 | struct mutex *lock = &rx8025->rtc->ops_lock; |
150 | u8 status; |
151 | |
152 | mutex_lock(lock); |
153 | |
154 | if (rx8025_read_reg(client, RX8025_REG_CTRL2, &status)) |
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; |
164 | local_irq_disable(); |
165 | rtc_update_irq(rx8025->rtc, 1, RTC_PF | RTC_IRQF); |
166 | local_irq_enable(); |
167 | } |
168 | |
169 | if (status & RX8025_BIT_CTRL2_DAFG) { |
170 | /* alarm */ |
171 | status &= RX8025_BIT_CTRL2_DAFG; |
172 | if (rx8025_write_reg(client, RX8025_REG_CTRL1, |
173 | rx8025->ctrl1 & ~RX8025_BIT_CTRL1_DALE)) |
174 | goto out; |
175 | local_irq_disable(); |
176 | rtc_update_irq(rx8025->rtc, 1, RTC_AF | RTC_IRQF); |
177 | local_irq_enable(); |
178 | } |
179 | |
180 | /* acknowledge IRQ */ |
181 | rx8025_write_reg(client, RX8025_REG_CTRL2, |
182 | status | RX8025_BIT_CTRL2_XST); |
183 | |
184 | out: |
185 | if (!rx8025->exiting) |
186 | enable_irq(client->irq); |
187 | |
188 | mutex_unlock(lock); |
189 | } |
190 | |
191 | static int rx8025_get_time(struct device *dev, struct rtc_time *dt) |
192 | { |
193 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); |
194 | u8 date[7]; |
195 | int err; |
196 | |
197 | err = rx8025_read_regs(rx8025->client, RX8025_REG_SEC, 7, date); |
198 | if (err) |
199 | return err; |
200 | |
201 | dev_dbg(dev, "%s: read 0x%02x 0x%02x " |
202 | "0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", __func__, |
203 | date[0], date[1], date[2], date[3], date[4], |
204 | date[5], date[6]); |
205 | |
206 | dt->tm_sec = bcd2bin(date[RX8025_REG_SEC] & 0x7f); |
207 | dt->tm_min = bcd2bin(date[RX8025_REG_MIN] & 0x7f); |
208 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) |
209 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x3f); |
210 | else |
211 | dt->tm_hour = bcd2bin(date[RX8025_REG_HOUR] & 0x1f) % 12 |
212 | + (date[RX8025_REG_HOUR] & 0x20 ? 12 : 0); |
213 | |
214 | dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f); |
215 | dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1; |
216 | dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]); |
217 | |
218 | if (dt->tm_year < 70) |
219 | dt->tm_year += 100; |
220 | |
221 | dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__, |
222 | dt->tm_sec, dt->tm_min, dt->tm_hour, |
223 | dt->tm_mday, dt->tm_mon, dt->tm_year); |
224 | |
225 | return rtc_valid_tm(dt); |
226 | } |
227 | |
228 | static int rx8025_set_time(struct device *dev, struct rtc_time *dt) |
229 | { |
230 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); |
231 | u8 date[7]; |
232 | |
233 | /* |
234 | * BUG: The HW assumes every year that is a multiple of 4 to be a leap |
235 | * year. Next time this is wrong is 2100, which will not be a leap |
236 | * year. |
237 | */ |
238 | |
239 | /* |
240 | * Here the read-only bits are written as "0". I'm not sure if that |
241 | * is sound. |
242 | */ |
243 | date[RX8025_REG_SEC] = bin2bcd(dt->tm_sec); |
244 | date[RX8025_REG_MIN] = bin2bcd(dt->tm_min); |
245 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) |
246 | date[RX8025_REG_HOUR] = bin2bcd(dt->tm_hour); |
247 | else |
248 | date[RX8025_REG_HOUR] = (dt->tm_hour >= 12 ? 0x20 : 0) |
249 | | bin2bcd((dt->tm_hour + 11) % 12 + 1); |
250 | |
251 | date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday); |
252 | date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday); |
253 | date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1); |
254 | date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100); |
255 | |
256 | dev_dbg(dev, |
257 | "%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n", |
258 | __func__, |
259 | date[0], date[1], date[2], date[3], date[4], date[5], date[6]); |
260 | |
261 | return rx8025_write_regs(rx8025->client, RX8025_REG_SEC, 7, date); |
262 | } |
263 | |
264 | static int rx8025_init_client(struct i2c_client *client, int *need_reset) |
265 | { |
266 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); |
267 | u8 ctrl[2], ctrl2; |
268 | int need_clear = 0; |
269 | int err; |
270 | |
271 | err = rx8025_read_regs(rx8025->client, RX8025_REG_CTRL1, 2, ctrl); |
272 | if (err) |
273 | goto out; |
274 | |
275 | /* Keep test bit zero ! */ |
276 | rx8025->ctrl1 = ctrl[0] & ~RX8025_BIT_CTRL1_TEST; |
277 | |
278 | if (ctrl[1] & RX8025_BIT_CTRL2_PON) { |
279 | dev_warn(&client->dev, "power-on reset was detected, " |
280 | "you may have to readjust the clock\n"); |
281 | *need_reset = 1; |
282 | } |
283 | |
284 | if (ctrl[1] & RX8025_BIT_CTRL2_VDET) { |
285 | dev_warn(&client->dev, "a power voltage drop was detected, " |
286 | "you may have to readjust the clock\n"); |
287 | *need_reset = 1; |
288 | } |
289 | |
290 | if (!(ctrl[1] & RX8025_BIT_CTRL2_XST)) { |
291 | dev_warn(&client->dev, "Oscillation stop was detected," |
292 | "you may have to readjust the clock\n"); |
293 | *need_reset = 1; |
294 | } |
295 | |
296 | if (ctrl[1] & (RX8025_BIT_CTRL2_DAFG | RX8025_BIT_CTRL2_WAFG)) { |
297 | dev_warn(&client->dev, "Alarm was detected\n"); |
298 | need_clear = 1; |
299 | } |
300 | |
301 | if (!(ctrl[1] & RX8025_BIT_CTRL2_CTFG)) |
302 | need_clear = 1; |
303 | |
304 | if (*need_reset || need_clear) { |
305 | ctrl2 = ctrl[0]; |
306 | ctrl2 &= ~(RX8025_BIT_CTRL2_PON | RX8025_BIT_CTRL2_VDET | |
307 | RX8025_BIT_CTRL2_CTFG | RX8025_BIT_CTRL2_WAFG | |
308 | RX8025_BIT_CTRL2_DAFG); |
309 | ctrl2 |= RX8025_BIT_CTRL2_XST; |
310 | |
311 | err = rx8025_write_reg(client, RX8025_REG_CTRL2, ctrl2); |
312 | } |
313 | out: |
314 | return err; |
315 | } |
316 | |
317 | /* Alarm support */ |
318 | static int rx8025_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
319 | { |
320 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); |
321 | struct i2c_client *client = rx8025->client; |
322 | u8 ctrl2, ald[2]; |
323 | int err; |
324 | |
325 | if (client->irq <= 0) |
326 | return -EINVAL; |
327 | |
328 | err = rx8025_read_regs(client, RX8025_REG_ALDMIN, 2, ald); |
329 | if (err) |
330 | return err; |
331 | |
332 | err = rx8025_read_reg(client, RX8025_REG_CTRL2, &ctrl2); |
333 | if (err) |
334 | return err; |
335 | |
336 | dev_dbg(dev, "%s: read alarm 0x%02x 0x%02x ctrl2 %02x\n", |
337 | __func__, ald[0], ald[1], ctrl2); |
338 | |
339 | /* Hardware alarms precision is 1 minute! */ |
340 | t->time.tm_sec = 0; |
341 | t->time.tm_min = bcd2bin(ald[0] & 0x7f); |
342 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) |
343 | t->time.tm_hour = bcd2bin(ald[1] & 0x3f); |
344 | else |
345 | t->time.tm_hour = bcd2bin(ald[1] & 0x1f) % 12 |
346 | + (ald[1] & 0x20 ? 12 : 0); |
347 | |
348 | t->time.tm_wday = -1; |
349 | t->time.tm_mday = -1; |
350 | t->time.tm_mon = -1; |
351 | t->time.tm_year = -1; |
352 | |
353 | dev_dbg(dev, "%s: date: %ds %dm %dh %dmd %dm %dy\n", |
354 | __func__, |
355 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, |
356 | t->time.tm_mday, t->time.tm_mon, t->time.tm_year); |
357 | t->enabled = !!(rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE); |
358 | t->pending = (ctrl2 & RX8025_BIT_CTRL2_DAFG) && t->enabled; |
359 | |
360 | return err; |
361 | } |
362 | |
363 | static int rx8025_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
364 | { |
365 | struct i2c_client *client = to_i2c_client(dev); |
366 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); |
367 | u8 ald[2]; |
368 | int err; |
369 | |
370 | if (client->irq <= 0) |
371 | return -EINVAL; |
372 | |
373 | /* Hardware alarm precision is 1 minute! */ |
374 | ald[0] = bin2bcd(t->time.tm_min); |
375 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_1224) |
376 | ald[1] = bin2bcd(t->time.tm_hour); |
377 | else |
378 | ald[1] = (t->time.tm_hour >= 12 ? 0x20 : 0) |
379 | | bin2bcd((t->time.tm_hour + 11) % 12 + 1); |
380 | |
381 | dev_dbg(dev, "%s: write 0x%02x 0x%02x\n", __func__, ald[0], ald[1]); |
382 | |
383 | if (rx8025->ctrl1 & RX8025_BIT_CTRL1_DALE) { |
384 | rx8025->ctrl1 &= ~RX8025_BIT_CTRL1_DALE; |
385 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, |
386 | rx8025->ctrl1); |
387 | if (err) |
388 | return err; |
389 | } |
390 | err = rx8025_write_regs(rx8025->client, RX8025_REG_ALDMIN, 2, ald); |
391 | if (err) |
392 | return err; |
393 | |
394 | if (t->enabled) { |
395 | rx8025->ctrl1 |= RX8025_BIT_CTRL1_DALE; |
396 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, |
397 | rx8025->ctrl1); |
398 | if (err) |
399 | return err; |
400 | } |
401 | |
402 | return 0; |
403 | } |
404 | |
405 | static int rx8025_alarm_irq_enable(struct device *dev, unsigned int enabled) |
406 | { |
407 | struct rx8025_data *rx8025 = dev_get_drvdata(dev); |
408 | u8 ctrl1; |
409 | int err; |
410 | |
411 | ctrl1 = rx8025->ctrl1; |
412 | if (enabled) |
413 | ctrl1 |= RX8025_BIT_CTRL1_DALE; |
414 | else |
415 | ctrl1 &= ~RX8025_BIT_CTRL1_DALE; |
416 | |
417 | if (ctrl1 != rx8025->ctrl1) { |
418 | rx8025->ctrl1 = ctrl1; |
419 | err = rx8025_write_reg(rx8025->client, RX8025_REG_CTRL1, |
420 | rx8025->ctrl1); |
421 | if (err) |
422 | return err; |
423 | } |
424 | return 0; |
425 | } |
426 | |
427 | static struct rtc_class_ops rx8025_rtc_ops = { |
428 | .read_time = rx8025_get_time, |
429 | .set_time = rx8025_set_time, |
430 | .read_alarm = rx8025_read_alarm, |
431 | .set_alarm = rx8025_set_alarm, |
432 | .alarm_irq_enable = rx8025_alarm_irq_enable, |
433 | }; |
434 | |
435 | /* |
436 | * Clock precision adjustment support |
437 | * |
438 | * According to the RX8025 SA/NB application manual the frequency and |
439 | * temperature characteristics can be approximated using the following |
440 | * equation: |
441 | * |
442 | * df = a * (ut - t)**2 |
443 | * |
444 | * df: Frequency deviation in any temperature |
445 | * a : Coefficient = (-35 +-5) * 10**-9 |
446 | * ut: Ultimate temperature in degree = +25 +-5 degree |
447 | * t : Any temperature in degree |
448 | * |
449 | * Note that the clock adjustment in ppb must be entered (which is |
450 | * the negative value of the deviation). |
451 | */ |
452 | static int rx8025_get_clock_adjust(struct device *dev, int *adj) |
453 | { |
454 | struct i2c_client *client = to_i2c_client(dev); |
455 | u8 digoff; |
456 | int err; |
457 | |
458 | err = rx8025_read_reg(client, RX8025_REG_DIGOFF, &digoff); |
459 | if (err) |
460 | return err; |
461 | |
462 | *adj = digoff >= 64 ? digoff - 128 : digoff; |
463 | if (*adj > 0) |
464 | (*adj)--; |
465 | *adj *= -RX8025_ADJ_RESOLUTION; |
466 | |
467 | return 0; |
468 | } |
469 | |
470 | static int rx8025_set_clock_adjust(struct device *dev, int adj) |
471 | { |
472 | struct i2c_client *client = to_i2c_client(dev); |
473 | u8 digoff; |
474 | int err; |
475 | |
476 | adj /= -RX8025_ADJ_RESOLUTION; |
477 | if (adj > RX8025_ADJ_DATA_MAX) |
478 | adj = RX8025_ADJ_DATA_MAX; |
479 | else if (adj < RX8025_ADJ_DATA_MIN) |
480 | adj = RX8025_ADJ_DATA_MIN; |
481 | else if (adj > 0) |
482 | adj++; |
483 | else if (adj < 0) |
484 | adj += 128; |
485 | digoff = adj; |
486 | |
487 | err = rx8025_write_reg(client, RX8025_REG_DIGOFF, digoff); |
488 | if (err) |
489 | return err; |
490 | |
491 | dev_dbg(dev, "%s: write 0x%02x\n", __func__, digoff); |
492 | |
493 | return 0; |
494 | } |
495 | |
496 | static ssize_t rx8025_sysfs_show_clock_adjust(struct device *dev, |
497 | struct device_attribute *attr, |
498 | char *buf) |
499 | { |
500 | int err, adj; |
501 | |
502 | err = rx8025_get_clock_adjust(dev, &adj); |
503 | if (err) |
504 | return err; |
505 | |
506 | return sprintf(buf, "%d\n", adj); |
507 | } |
508 | |
509 | static ssize_t rx8025_sysfs_store_clock_adjust(struct device *dev, |
510 | struct device_attribute *attr, |
511 | const char *buf, size_t count) |
512 | { |
513 | int adj, err; |
514 | |
515 | if (sscanf(buf, "%i", &adj) != 1) |
516 | return -EINVAL; |
517 | |
518 | err = rx8025_set_clock_adjust(dev, adj); |
519 | |
520 | return err ? err : count; |
521 | } |
522 | |
523 | static DEVICE_ATTR(clock_adjust_ppb, S_IRUGO | S_IWUSR, |
524 | rx8025_sysfs_show_clock_adjust, |
525 | rx8025_sysfs_store_clock_adjust); |
526 | |
527 | static int rx8025_sysfs_register(struct device *dev) |
528 | { |
529 | return device_create_file(dev, &dev_attr_clock_adjust_ppb); |
530 | } |
531 | |
532 | static void rx8025_sysfs_unregister(struct device *dev) |
533 | { |
534 | device_remove_file(dev, &dev_attr_clock_adjust_ppb); |
535 | } |
536 | |
537 | static int rx8025_probe(struct i2c_client *client, |
538 | const struct i2c_device_id *id) |
539 | { |
540 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
541 | struct rx8025_data *rx8025; |
542 | int err, need_reset = 0; |
543 | |
544 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
545 | | I2C_FUNC_SMBUS_I2C_BLOCK)) { |
546 | dev_err(&adapter->dev, |
547 | "doesn't support required functionality\n"); |
548 | err = -EIO; |
549 | goto errout; |
550 | } |
551 | |
552 | rx8025 = kzalloc(sizeof(*rx8025), GFP_KERNEL); |
553 | if (!rx8025) { |
554 | dev_err(&adapter->dev, "failed to alloc memory\n"); |
555 | err = -ENOMEM; |
556 | goto errout; |
557 | } |
558 | |
559 | rx8025->client = client; |
560 | i2c_set_clientdata(client, rx8025); |
561 | INIT_WORK(&rx8025->work, rx8025_work); |
562 | |
563 | err = rx8025_init_client(client, &need_reset); |
564 | if (err) |
565 | goto errout_free; |
566 | |
567 | if (need_reset) { |
568 | struct rtc_time tm; |
569 | dev_info(&client->dev, |
570 | "bad conditions detected, resetting date\n"); |
571 | rtc_time_to_tm(0, &tm); /* 1970/1/1 */ |
572 | rx8025_set_time(&client->dev, &tm); |
573 | } |
574 | |
575 | rx8025->rtc = rtc_device_register(client->name, &client->dev, |
576 | &rx8025_rtc_ops, THIS_MODULE); |
577 | if (IS_ERR(rx8025->rtc)) { |
578 | err = PTR_ERR(rx8025->rtc); |
579 | dev_err(&client->dev, "unable to register the class device\n"); |
580 | goto errout_free; |
581 | } |
582 | |
583 | if (client->irq > 0) { |
584 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); |
585 | err = request_irq(client->irq, rx8025_irq, |
586 | 0, "rx8025", client); |
587 | if (err) { |
588 | dev_err(&client->dev, "unable to request IRQ\n"); |
589 | goto errout_reg; |
590 | } |
591 | } |
592 | |
593 | rx8025->rtc->irq_freq = 1; |
594 | rx8025->rtc->max_user_freq = 1; |
595 | |
596 | err = rx8025_sysfs_register(&client->dev); |
597 | if (err) |
598 | goto errout_irq; |
599 | |
600 | return 0; |
601 | |
602 | errout_irq: |
603 | if (client->irq > 0) |
604 | free_irq(client->irq, client); |
605 | |
606 | errout_reg: |
607 | rtc_device_unregister(rx8025->rtc); |
608 | |
609 | errout_free: |
610 | kfree(rx8025); |
611 | |
612 | errout: |
613 | dev_err(&adapter->dev, "probing for rx8025 failed\n"); |
614 | return err; |
615 | } |
616 | |
617 | static int rx8025_remove(struct i2c_client *client) |
618 | { |
619 | struct rx8025_data *rx8025 = i2c_get_clientdata(client); |
620 | struct mutex *lock = &rx8025->rtc->ops_lock; |
621 | |
622 | if (client->irq > 0) { |
623 | mutex_lock(lock); |
624 | rx8025->exiting = 1; |
625 | mutex_unlock(lock); |
626 | |
627 | free_irq(client->irq, client); |
628 | cancel_work_sync(&rx8025->work); |
629 | } |
630 | |
631 | rx8025_sysfs_unregister(&client->dev); |
632 | rtc_device_unregister(rx8025->rtc); |
633 | kfree(rx8025); |
634 | return 0; |
635 | } |
636 | |
637 | static struct i2c_driver rx8025_driver = { |
638 | .driver = { |
639 | .name = "rtc-rx8025", |
640 | .owner = THIS_MODULE, |
641 | }, |
642 | .probe = rx8025_probe, |
643 | .remove = rx8025_remove, |
644 | .id_table = rx8025_id, |
645 | }; |
646 | |
647 | module_i2c_driver(rx8025_driver); |
648 | |
649 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); |
650 | MODULE_DESCRIPTION("RX-8025 SA/NB RTC driver"); |
651 | MODULE_LICENSE("GPL"); |
652 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9