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Alessandro Zummo1fec7c62006-03-27 01:16:42 -08001/*
2 * An i2c driver for the Xicor/Intersil X1205 RTC
3 * Copyright 2004 Karen Spearel
4 * Copyright 2005 Alessandro Zummo
5 *
6 * please send all reports to:
7 * Karen Spearel <kas111 at gmail dot com>
8 * Alessandro Zummo <a.zummo@towertech.it>
9 *
10 * based on a lot of other RTC drivers.
11 *
Jean Delvare890e0372007-07-12 14:12:28 +020012 * Information and datasheet:
13 * http://www.intersil.com/cda/deviceinfo/0,1477,X1205,00.html
14 *
Alessandro Zummo1fec7c62006-03-27 01:16:42 -080015 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2 as
17 * published by the Free Software Foundation.
18 */
19
20#include <linux/i2c.h>
21#include <linux/bcd.h>
22#include <linux/rtc.h>
23#include <linux/delay.h>
24
Alessandro Zummo4edac2b2008-04-28 02:11:54 -070025#define DRV_VERSION "1.0.8"
Alessandro Zummo1fec7c62006-03-27 01:16:42 -080026
27/* offsets into CCR area */
28
29#define CCR_SEC 0
30#define CCR_MIN 1
31#define CCR_HOUR 2
32#define CCR_MDAY 3
33#define CCR_MONTH 4
34#define CCR_YEAR 5
35#define CCR_WDAY 6
36#define CCR_Y2K 7
37
38#define X1205_REG_SR 0x3F /* status register */
39#define X1205_REG_Y2K 0x37
40#define X1205_REG_DW 0x36
41#define X1205_REG_YR 0x35
42#define X1205_REG_MO 0x34
43#define X1205_REG_DT 0x33
44#define X1205_REG_HR 0x32
45#define X1205_REG_MN 0x31
46#define X1205_REG_SC 0x30
47#define X1205_REG_DTR 0x13
48#define X1205_REG_ATR 0x12
49#define X1205_REG_INT 0x11
50#define X1205_REG_0 0x10
51#define X1205_REG_Y2K1 0x0F
52#define X1205_REG_DWA1 0x0E
53#define X1205_REG_YRA1 0x0D
54#define X1205_REG_MOA1 0x0C
55#define X1205_REG_DTA1 0x0B
56#define X1205_REG_HRA1 0x0A
57#define X1205_REG_MNA1 0x09
58#define X1205_REG_SCA1 0x08
59#define X1205_REG_Y2K0 0x07
60#define X1205_REG_DWA0 0x06
61#define X1205_REG_YRA0 0x05
62#define X1205_REG_MOA0 0x04
63#define X1205_REG_DTA0 0x03
64#define X1205_REG_HRA0 0x02
65#define X1205_REG_MNA0 0x01
66#define X1205_REG_SCA0 0x00
67
68#define X1205_CCR_BASE 0x30 /* Base address of CCR */
69#define X1205_ALM0_BASE 0x00 /* Base address of ALARM0 */
70
71#define X1205_SR_RTCF 0x01 /* Clock failure */
72#define X1205_SR_WEL 0x02 /* Write Enable Latch */
73#define X1205_SR_RWEL 0x04 /* Register Write Enable */
74
75#define X1205_DTR_DTR0 0x01
76#define X1205_DTR_DTR1 0x02
77#define X1205_DTR_DTR2 0x04
78
79#define X1205_HR_MIL 0x80 /* Set in ccr.hour for 24 hr mode */
80
Alessandro Zummo4edac2b2008-04-28 02:11:54 -070081static struct i2c_driver x1205_driver;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -080082
83/*
84 * In the routines that deal directly with the x1205 hardware, we use
85 * rtc_time -- month 0-11, hour 0-23, yr = calendar year-epoch
86 * Epoch is initialized as 2000. Time is set to UTC.
87 */
88static int x1205_get_datetime(struct i2c_client *client, struct rtc_time *tm,
89 unsigned char reg_base)
90{
91 unsigned char dt_addr[2] = { 0, reg_base };
92
93 unsigned char buf[8];
94
95 struct i2c_msg msgs[] = {
96 { client->addr, 0, 2, dt_addr }, /* setup read ptr */
97 { client->addr, I2C_M_RD, 8, buf }, /* read date */
98 };
99
100 /* read date registers */
101 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700102 dev_err(&client->dev, "%s: read error\n", __func__);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800103 return -EIO;
104 }
105
106 dev_dbg(&client->dev,
107 "%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
108 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700109 __func__,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800110 buf[0], buf[1], buf[2], buf[3],
111 buf[4], buf[5], buf[6], buf[7]);
112
113 tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
114 tm->tm_min = BCD2BIN(buf[CCR_MIN]);
115 tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
116 tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
117 tm->tm_mon = BCD2BIN(buf[CCR_MONTH]) - 1; /* mon is 0-11 */
118 tm->tm_year = BCD2BIN(buf[CCR_YEAR])
119 + (BCD2BIN(buf[CCR_Y2K]) * 100) - 1900;
120 tm->tm_wday = buf[CCR_WDAY];
121
122 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
123 "mday=%d, mon=%d, year=%d, wday=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700124 __func__,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800125 tm->tm_sec, tm->tm_min, tm->tm_hour,
126 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
127
128 return 0;
129}
130
131static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
132{
133 static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
134
135 struct i2c_msg msgs[] = {
136 { client->addr, 0, 2, sr_addr }, /* setup read ptr */
137 { client->addr, I2C_M_RD, 1, sr }, /* read status */
138 };
139
140 /* read status register */
141 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700142 dev_err(&client->dev, "%s: read error\n", __func__);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800143 return -EIO;
144 }
145
146 return 0;
147}
148
149static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
150 int datetoo, u8 reg_base)
151{
152 int i, xfer;
153 unsigned char buf[8];
154
155 static const unsigned char wel[3] = { 0, X1205_REG_SR,
156 X1205_SR_WEL };
157
158 static const unsigned char rwel[3] = { 0, X1205_REG_SR,
159 X1205_SR_WEL | X1205_SR_RWEL };
160
161 static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
162
163 dev_dbg(&client->dev,
164 "%s: secs=%d, mins=%d, hours=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700165 __func__,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800166 tm->tm_sec, tm->tm_min, tm->tm_hour);
167
168 buf[CCR_SEC] = BIN2BCD(tm->tm_sec);
169 buf[CCR_MIN] = BIN2BCD(tm->tm_min);
170
171 /* set hour and 24hr bit */
172 buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL;
173
174 /* should we also set the date? */
175 if (datetoo) {
176 dev_dbg(&client->dev,
177 "%s: mday=%d, mon=%d, year=%d, wday=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700178 __func__,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800179 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
180
181 buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
182
183 /* month, 1 - 12 */
184 buf[CCR_MONTH] = BIN2BCD(tm->tm_mon + 1);
185
186 /* year, since the rtc epoch*/
187 buf[CCR_YEAR] = BIN2BCD(tm->tm_year % 100);
188 buf[CCR_WDAY] = tm->tm_wday & 0x07;
189 buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100);
190 }
191
192 /* this sequence is required to unlock the chip */
193 if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700194 dev_err(&client->dev, "%s: wel - %d\n", __func__, xfer);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800195 return -EIO;
196 }
197
198 if ((xfer = i2c_master_send(client, rwel, 3)) != 3) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700199 dev_err(&client->dev, "%s: rwel - %d\n", __func__, xfer);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800200 return -EIO;
201 }
202
203 /* write register's data */
204 for (i = 0; i < (datetoo ? 8 : 3); i++) {
205 unsigned char rdata[3] = { 0, reg_base + i, buf[i] };
206
207 xfer = i2c_master_send(client, rdata, 3);
208 if (xfer != 3) {
209 dev_err(&client->dev,
210 "%s: xfer=%d addr=%02x, data=%02x\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700211 __func__,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800212 xfer, rdata[1], rdata[2]);
213 return -EIO;
214 }
215 };
216
217 /* disable further writes */
218 if ((xfer = i2c_master_send(client, diswe, 3)) != 3) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700219 dev_err(&client->dev, "%s: diswe - %d\n", __func__, xfer);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800220 return -EIO;
221 }
222
223 return 0;
224}
225
226static int x1205_fix_osc(struct i2c_client *client)
227{
228 int err;
229 struct rtc_time tm;
230
231 tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
232
233 if ((err = x1205_set_datetime(client, &tm, 0, X1205_CCR_BASE)) < 0)
234 dev_err(&client->dev,
235 "unable to restart the oscillator\n");
236
237 return err;
238}
239
240static int x1205_get_dtrim(struct i2c_client *client, int *trim)
241{
242 unsigned char dtr;
243 static unsigned char dtr_addr[2] = { 0, X1205_REG_DTR };
244
245 struct i2c_msg msgs[] = {
246 { client->addr, 0, 2, dtr_addr }, /* setup read ptr */
247 { client->addr, I2C_M_RD, 1, &dtr }, /* read dtr */
248 };
249
250 /* read dtr register */
251 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700252 dev_err(&client->dev, "%s: read error\n", __func__);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800253 return -EIO;
254 }
255
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700256 dev_dbg(&client->dev, "%s: raw dtr=%x\n", __func__, dtr);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800257
258 *trim = 0;
259
260 if (dtr & X1205_DTR_DTR0)
261 *trim += 20;
262
263 if (dtr & X1205_DTR_DTR1)
264 *trim += 10;
265
266 if (dtr & X1205_DTR_DTR2)
267 *trim = -*trim;
268
269 return 0;
270}
271
272static int x1205_get_atrim(struct i2c_client *client, int *trim)
273{
274 s8 atr;
275 static unsigned char atr_addr[2] = { 0, X1205_REG_ATR };
276
277 struct i2c_msg msgs[] = {
278 { client->addr, 0, 2, atr_addr }, /* setup read ptr */
279 { client->addr, I2C_M_RD, 1, &atr }, /* read atr */
280 };
281
282 /* read atr register */
283 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700284 dev_err(&client->dev, "%s: read error\n", __func__);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800285 return -EIO;
286 }
287
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700288 dev_dbg(&client->dev, "%s: raw atr=%x\n", __func__, atr);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800289
290 /* atr is a two's complement value on 6 bits,
291 * perform sign extension. The formula is
292 * Catr = (atr * 0.25pF) + 11.00pF.
293 */
294 if (atr & 0x20)
295 atr |= 0xC0;
296
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700297 dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __func__, atr, atr);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800298
299 *trim = (atr * 250) + 11000;
300
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700301 dev_dbg(&client->dev, "%s: real=%d\n", __func__, *trim);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800302
303 return 0;
304}
305
306struct x1205_limit
307{
308 unsigned char reg, mask, min, max;
309};
310
311static int x1205_validate_client(struct i2c_client *client)
312{
313 int i, xfer;
314
315 /* Probe array. We will read the register at the specified
316 * address and check if the given bits are zero.
317 */
318 static const unsigned char probe_zero_pattern[] = {
319 /* register, mask */
320 X1205_REG_SR, 0x18,
321 X1205_REG_DTR, 0xF8,
322 X1205_REG_ATR, 0xC0,
323 X1205_REG_INT, 0x18,
324 X1205_REG_0, 0xFF,
325 };
326
327 static const struct x1205_limit probe_limits_pattern[] = {
328 /* register, mask, min, max */
329 { X1205_REG_Y2K, 0xFF, 19, 20 },
330 { X1205_REG_DW, 0xFF, 0, 6 },
331 { X1205_REG_YR, 0xFF, 0, 99 },
332 { X1205_REG_MO, 0xFF, 0, 12 },
333 { X1205_REG_DT, 0xFF, 0, 31 },
334 { X1205_REG_HR, 0x7F, 0, 23 },
335 { X1205_REG_MN, 0xFF, 0, 59 },
336 { X1205_REG_SC, 0xFF, 0, 59 },
337 { X1205_REG_Y2K1, 0xFF, 19, 20 },
338 { X1205_REG_Y2K0, 0xFF, 19, 20 },
339 };
340
341 /* check that registers have bits a 0 where expected */
342 for (i = 0; i < ARRAY_SIZE(probe_zero_pattern); i += 2) {
343 unsigned char buf;
344
345 unsigned char addr[2] = { 0, probe_zero_pattern[i] };
346
347 struct i2c_msg msgs[2] = {
348 { client->addr, 0, 2, addr },
349 { client->addr, I2C_M_RD, 1, &buf },
350 };
351
352 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
David Brownella14e1892006-12-10 02:19:02 -0800353 dev_err(&client->dev,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800354 "%s: could not read register %x\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700355 __func__, probe_zero_pattern[i]);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800356
357 return -EIO;
358 }
359
360 if ((buf & probe_zero_pattern[i+1]) != 0) {
David Brownella14e1892006-12-10 02:19:02 -0800361 dev_err(&client->dev,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800362 "%s: register=%02x, zero pattern=%d, value=%x\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700363 __func__, probe_zero_pattern[i], i, buf);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800364
365 return -ENODEV;
366 }
367 }
368
369 /* check limits (only registers with bcd values) */
370 for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
371 unsigned char reg, value;
372
373 unsigned char addr[2] = { 0, probe_limits_pattern[i].reg };
374
375 struct i2c_msg msgs[2] = {
376 { client->addr, 0, 2, addr },
377 { client->addr, I2C_M_RD, 1, &reg },
378 };
379
380 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
David Brownella14e1892006-12-10 02:19:02 -0800381 dev_err(&client->dev,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800382 "%s: could not read register %x\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700383 __func__, probe_limits_pattern[i].reg);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800384
385 return -EIO;
386 }
387
388 value = BCD2BIN(reg & probe_limits_pattern[i].mask);
389
390 if (value > probe_limits_pattern[i].max ||
391 value < probe_limits_pattern[i].min) {
David Brownella14e1892006-12-10 02:19:02 -0800392 dev_dbg(&client->dev,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800393 "%s: register=%x, lim pattern=%d, value=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700394 __func__, probe_limits_pattern[i].reg,
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800395 i, value);
396
397 return -ENODEV;
398 }
399 }
400
401 return 0;
402}
403
404static int x1205_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
405{
406 return x1205_get_datetime(to_i2c_client(dev),
407 &alrm->time, X1205_ALM0_BASE);
408}
409
410static int x1205_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
411{
412 return x1205_set_datetime(to_i2c_client(dev),
413 &alrm->time, 1, X1205_ALM0_BASE);
414}
415
416static int x1205_rtc_read_time(struct device *dev, struct rtc_time *tm)
417{
418 return x1205_get_datetime(to_i2c_client(dev),
419 tm, X1205_CCR_BASE);
420}
421
422static int x1205_rtc_set_time(struct device *dev, struct rtc_time *tm)
423{
424 return x1205_set_datetime(to_i2c_client(dev),
425 tm, 1, X1205_CCR_BASE);
426}
427
428static int x1205_rtc_proc(struct device *dev, struct seq_file *seq)
429{
430 int err, dtrim, atrim;
431
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800432 if ((err = x1205_get_dtrim(to_i2c_client(dev), &dtrim)) == 0)
433 seq_printf(seq, "digital_trim\t: %d ppm\n", dtrim);
434
435 if ((err = x1205_get_atrim(to_i2c_client(dev), &atrim)) == 0)
436 seq_printf(seq, "analog_trim\t: %d.%02d pF\n",
437 atrim / 1000, atrim % 1000);
438 return 0;
439}
440
David Brownellff8371a2006-09-30 23:28:17 -0700441static const struct rtc_class_ops x1205_rtc_ops = {
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800442 .proc = x1205_rtc_proc,
443 .read_time = x1205_rtc_read_time,
444 .set_time = x1205_rtc_set_time,
445 .read_alarm = x1205_rtc_read_alarm,
446 .set_alarm = x1205_rtc_set_alarm,
447};
448
449static ssize_t x1205_sysfs_show_atrim(struct device *dev,
450 struct device_attribute *attr, char *buf)
451{
Alessandro Zummo015aefb2006-04-10 22:54:42 -0700452 int err, atrim;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800453
Alessandro Zummo015aefb2006-04-10 22:54:42 -0700454 err = x1205_get_atrim(to_i2c_client(dev), &atrim);
455 if (err)
456 return err;
457
458 return sprintf(buf, "%d.%02d pF\n", atrim / 1000, atrim % 1000);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800459}
460static DEVICE_ATTR(atrim, S_IRUGO, x1205_sysfs_show_atrim, NULL);
461
462static ssize_t x1205_sysfs_show_dtrim(struct device *dev,
463 struct device_attribute *attr, char *buf)
464{
Alessandro Zummo015aefb2006-04-10 22:54:42 -0700465 int err, dtrim;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800466
Alessandro Zummo015aefb2006-04-10 22:54:42 -0700467 err = x1205_get_dtrim(to_i2c_client(dev), &dtrim);
468 if (err)
469 return err;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800470
Alessandro Zummo015aefb2006-04-10 22:54:42 -0700471 return sprintf(buf, "%d ppm\n", dtrim);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800472}
473static DEVICE_ATTR(dtrim, S_IRUGO, x1205_sysfs_show_dtrim, NULL);
474
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700475static int x1205_sysfs_register(struct device *dev)
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800476{
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700477 int err;
478
479 err = device_create_file(dev, &dev_attr_atrim);
480 if (err)
481 return err;
482
483 err = device_create_file(dev, &dev_attr_dtrim);
484 if (err)
485 device_remove_file(dev, &dev_attr_atrim);
486
487 return err;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800488}
489
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700490static void x1205_sysfs_unregister(struct device *dev)
491{
492 device_remove_file(dev, &dev_attr_atrim);
493 device_remove_file(dev, &dev_attr_dtrim);
494}
495
496
497static int x1205_probe(struct i2c_client *client)
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800498{
499 int err = 0;
500 unsigned char sr;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800501 struct rtc_device *rtc;
502
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700503 dev_dbg(&client->dev, "%s\n", __func__);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800504
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700505 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
506 return -ENODEV;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800507
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700508 if (x1205_validate_client(client) < 0)
509 return -ENODEV;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800510
511 dev_info(&client->dev, "chip found, driver version " DRV_VERSION "\n");
512
513 rtc = rtc_device_register(x1205_driver.driver.name, &client->dev,
514 &x1205_rtc_ops, THIS_MODULE);
515
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700516 if (IS_ERR(rtc))
517 return PTR_ERR(rtc);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800518
519 i2c_set_clientdata(client, rtc);
520
521 /* Check for power failures and eventualy enable the osc */
522 if ((err = x1205_get_status(client, &sr)) == 0) {
523 if (sr & X1205_SR_RTCF) {
524 dev_err(&client->dev,
525 "power failure detected, "
526 "please set the clock\n");
527 udelay(50);
528 x1205_fix_osc(client);
529 }
530 }
531 else
532 dev_err(&client->dev, "couldn't read status\n");
533
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700534 err = x1205_sysfs_register(&client->dev);
535 if (err)
536 goto exit_devreg;
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800537
538 return 0;
539
Jeff Garzik91046a82006-12-06 20:35:34 -0800540exit_devreg:
541 rtc_device_unregister(rtc);
542
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800543 return err;
544}
545
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700546static int x1205_remove(struct i2c_client *client)
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800547{
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800548 struct rtc_device *rtc = i2c_get_clientdata(client);
549
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700550 rtc_device_unregister(rtc);
551 x1205_sysfs_unregister(&client->dev);
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800552 return 0;
553}
554
Alessandro Zummo4edac2b2008-04-28 02:11:54 -0700555static struct i2c_driver x1205_driver = {
556 .driver = {
557 .name = "rtc-x1205",
558 },
559 .probe = x1205_probe,
560 .remove = x1205_remove,
561};
562
Alessandro Zummo1fec7c62006-03-27 01:16:42 -0800563static int __init x1205_init(void)
564{
565 return i2c_add_driver(&x1205_driver);
566}
567
568static void __exit x1205_exit(void)
569{
570 i2c_del_driver(&x1205_driver);
571}
572
573MODULE_AUTHOR(
574 "Karen Spearel <kas111 at gmail dot com>, "
575 "Alessandro Zummo <a.zummo@towertech.it>");
576MODULE_DESCRIPTION("Xicor/Intersil X1205 RTC driver");
577MODULE_LICENSE("GPL");
578MODULE_VERSION(DRV_VERSION);
579
580module_init(x1205_init);
581module_exit(x1205_exit);