Root/drivers/rtc/rtc-isl1208.c

1/*
2 * Intersil ISL1208 rtc class driver
3 *
4 * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12
13#include <linux/module.h>
14#include <linux/i2c.h>
15#include <linux/bcd.h>
16#include <linux/rtc.h>
17
18#define DRV_VERSION "0.3"
19
20/* Register map */
21/* rtc section */
22#define ISL1208_REG_SC 0x00
23#define ISL1208_REG_MN 0x01
24#define ISL1208_REG_HR 0x02
25#define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */
26#define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
27#define ISL1208_REG_DT 0x03
28#define ISL1208_REG_MO 0x04
29#define ISL1208_REG_YR 0x05
30#define ISL1208_REG_DW 0x06
31#define ISL1208_RTC_SECTION_LEN 7
32
33/* control/status section */
34#define ISL1208_REG_SR 0x07
35#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
36#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
37#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
38#define ISL1208_REG_SR_ALM (1<<2) /* alarm */
39#define ISL1208_REG_SR_BAT (1<<1) /* battery */
40#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
41#define ISL1208_REG_INT 0x08
42#define ISL1208_REG_INT_ALME (1<<6) /* alarm enable */
43#define ISL1208_REG_INT_IM (1<<7) /* interrupt/alarm mode */
44#define ISL1208_REG_09 0x09 /* reserved */
45#define ISL1208_REG_ATR 0x0a
46#define ISL1208_REG_DTR 0x0b
47
48/* alarm section */
49#define ISL1208_REG_SCA 0x0c
50#define ISL1208_REG_MNA 0x0d
51#define ISL1208_REG_HRA 0x0e
52#define ISL1208_REG_DTA 0x0f
53#define ISL1208_REG_MOA 0x10
54#define ISL1208_REG_DWA 0x11
55#define ISL1208_ALARM_SECTION_LEN 6
56
57/* user section */
58#define ISL1208_REG_USR1 0x12
59#define ISL1208_REG_USR2 0x13
60#define ISL1208_USR_SECTION_LEN 2
61
62static struct i2c_driver isl1208_driver;
63
64/* block read */
65static int
66isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
67              unsigned len)
68{
69    u8 reg_addr[1] = { reg };
70    struct i2c_msg msgs[2] = {
71        {client->addr, 0, sizeof(reg_addr), reg_addr}
72        ,
73        {client->addr, I2C_M_RD, len, buf}
74    };
75    int ret;
76
77    BUG_ON(reg > ISL1208_REG_USR2);
78    BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
79
80    ret = i2c_transfer(client->adapter, msgs, 2);
81    if (ret > 0)
82        ret = 0;
83    return ret;
84}
85
86/* block write */
87static int
88isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
89             unsigned len)
90{
91    u8 i2c_buf[ISL1208_REG_USR2 + 2];
92    struct i2c_msg msgs[1] = {
93        {client->addr, 0, len + 1, i2c_buf}
94    };
95    int ret;
96
97    BUG_ON(reg > ISL1208_REG_USR2);
98    BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
99
100    i2c_buf[0] = reg;
101    memcpy(&i2c_buf[1], &buf[0], len);
102
103    ret = i2c_transfer(client->adapter, msgs, 1);
104    if (ret > 0)
105        ret = 0;
106    return ret;
107}
108
109/* simple check to see wether we have a isl1208 */
110static int
111isl1208_i2c_validate_client(struct i2c_client *client)
112{
113    u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
114    u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
115        0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
116    };
117    int i;
118    int ret;
119
120    ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
121    if (ret < 0)
122        return ret;
123
124    for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
125        if (regs[i] & zero_mask[i]) /* check if bits are cleared */
126            return -ENODEV;
127    }
128
129    return 0;
130}
131
132static int
133isl1208_i2c_get_sr(struct i2c_client *client)
134{
135    int sr = i2c_smbus_read_byte_data(client, ISL1208_REG_SR);
136    if (sr < 0)
137        return -EIO;
138
139    return sr;
140}
141
142static int
143isl1208_i2c_get_atr(struct i2c_client *client)
144{
145    int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
146    if (atr < 0)
147        return atr;
148
149    /* The 6bit value in the ATR register controls the load
150     * capacitance C_load * in steps of 0.25pF
151     *
152     * bit (1<<5) of the ATR register is inverted
153     *
154     * C_load(ATR=0x20) = 4.50pF
155     * C_load(ATR=0x00) = 12.50pF
156     * C_load(ATR=0x1f) = 20.25pF
157     *
158     */
159
160    atr &= 0x3f; /* mask out lsb */
161    atr ^= 1 << 5; /* invert 6th bit */
162    atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
163
164    return atr;
165}
166
167static int
168isl1208_i2c_get_dtr(struct i2c_client *client)
169{
170    int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
171    if (dtr < 0)
172        return -EIO;
173
174    /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
175    dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
176
177    return dtr;
178}
179
180static int
181isl1208_i2c_get_usr(struct i2c_client *client)
182{
183    u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
184    int ret;
185
186    ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,
187                    ISL1208_USR_SECTION_LEN);
188    if (ret < 0)
189        return ret;
190
191    return (buf[1] << 8) | buf[0];
192}
193
194static int
195isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
196{
197    u8 buf[ISL1208_USR_SECTION_LEN];
198
199    buf[0] = usr & 0xff;
200    buf[1] = (usr >> 8) & 0xff;
201
202    return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,
203                    ISL1208_USR_SECTION_LEN);
204}
205
206static int
207isl1208_rtc_toggle_alarm(struct i2c_client *client, int enable)
208{
209    int icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
210
211    if (icr < 0) {
212        dev_err(&client->dev, "%s: reading INT failed\n", __func__);
213        return icr;
214    }
215
216    if (enable)
217        icr |= ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM;
218    else
219        icr &= ~(ISL1208_REG_INT_ALME | ISL1208_REG_INT_IM);
220
221    icr = i2c_smbus_write_byte_data(client, ISL1208_REG_INT, icr);
222    if (icr < 0) {
223        dev_err(&client->dev, "%s: writing INT failed\n", __func__);
224        return icr;
225    }
226
227    return 0;
228}
229
230static int
231isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
232{
233    struct i2c_client *const client = to_i2c_client(dev);
234    int sr, dtr, atr, usr;
235
236    sr = isl1208_i2c_get_sr(client);
237    if (sr < 0) {
238        dev_err(&client->dev, "%s: reading SR failed\n", __func__);
239        return sr;
240    }
241
242    seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
243           (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
244           (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
245           (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
246           (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
247           (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
248           (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);
249
250    seq_printf(seq, "batt_status\t: %s\n",
251           (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
252
253    dtr = isl1208_i2c_get_dtr(client);
254    if (dtr >= 0 - 1)
255        seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
256
257    atr = isl1208_i2c_get_atr(client);
258    if (atr >= 0)
259        seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
260               atr >> 2, (atr & 0x3) * 25);
261
262    usr = isl1208_i2c_get_usr(client);
263    if (usr >= 0)
264        seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
265
266    return 0;
267}
268
269static int
270isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
271{
272    int sr;
273    u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
274
275    sr = isl1208_i2c_get_sr(client);
276    if (sr < 0) {
277        dev_err(&client->dev, "%s: reading SR failed\n", __func__);
278        return -EIO;
279    }
280
281    sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
282    if (sr < 0) {
283        dev_err(&client->dev, "%s: reading RTC section failed\n",
284            __func__);
285        return sr;
286    }
287
288    tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
289    tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
290
291    /* HR field has a more complex interpretation */
292    {
293        const u8 _hr = regs[ISL1208_REG_HR];
294        if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
295            tm->tm_hour = bcd2bin(_hr & 0x3f);
296        else {
297            /* 12h format */
298            tm->tm_hour = bcd2bin(_hr & 0x1f);
299            if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
300                tm->tm_hour += 12;
301        }
302    }
303
304    tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
305    tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
306    tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;
307    tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
308
309    return 0;
310}
311
312static int
313isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
314{
315    struct rtc_time *const tm = &alarm->time;
316    u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
317    int icr, yr, sr = isl1208_i2c_get_sr(client);
318
319    if (sr < 0) {
320        dev_err(&client->dev, "%s: reading SR failed\n", __func__);
321        return sr;
322    }
323
324    sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
325                   ISL1208_ALARM_SECTION_LEN);
326    if (sr < 0) {
327        dev_err(&client->dev, "%s: reading alarm section failed\n",
328            __func__);
329        return sr;
330    }
331
332    /* MSB of each alarm register is an enable bit */
333    tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);
334    tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);
335    tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);
336    tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);
337    tm->tm_mon =
338        bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;
339    tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);
340
341    /* The alarm doesn't store the year so get it from the rtc section */
342    yr = i2c_smbus_read_byte_data(client, ISL1208_REG_YR);
343    if (yr < 0) {
344        dev_err(&client->dev, "%s: reading RTC YR failed\n", __func__);
345        return yr;
346    }
347    tm->tm_year = bcd2bin(yr) + 100;
348
349    icr = i2c_smbus_read_byte_data(client, ISL1208_REG_INT);
350    if (icr < 0) {
351        dev_err(&client->dev, "%s: reading INT failed\n", __func__);
352        return icr;
353    }
354    alarm->enabled = !!(icr & ISL1208_REG_INT_ALME);
355
356    return 0;
357}
358
359static int
360isl1208_i2c_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
361{
362    struct rtc_time *alarm_tm = &alarm->time;
363    u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
364    const int offs = ISL1208_REG_SCA;
365    unsigned long rtc_secs, alarm_secs;
366    struct rtc_time rtc_tm;
367    int err, enable;
368
369    err = isl1208_i2c_read_time(client, &rtc_tm);
370    if (err)
371        return err;
372    err = rtc_tm_to_time(&rtc_tm, &rtc_secs);
373    if (err)
374        return err;
375    err = rtc_tm_to_time(alarm_tm, &alarm_secs);
376    if (err)
377        return err;
378
379    /* If the alarm time is before the current time disable the alarm */
380    if (!alarm->enabled || alarm_secs <= rtc_secs)
381        enable = 0x00;
382    else
383        enable = 0x80;
384
385    /* Program the alarm and enable it for each setting */
386    regs[ISL1208_REG_SCA - offs] = bin2bcd(alarm_tm->tm_sec) | enable;
387    regs[ISL1208_REG_MNA - offs] = bin2bcd(alarm_tm->tm_min) | enable;
388    regs[ISL1208_REG_HRA - offs] = bin2bcd(alarm_tm->tm_hour) |
389        ISL1208_REG_HR_MIL | enable;
390
391    regs[ISL1208_REG_DTA - offs] = bin2bcd(alarm_tm->tm_mday) | enable;
392    regs[ISL1208_REG_MOA - offs] = bin2bcd(alarm_tm->tm_mon + 1) | enable;
393    regs[ISL1208_REG_DWA - offs] = bin2bcd(alarm_tm->tm_wday & 7) | enable;
394
395    /* write ALARM registers */
396    err = isl1208_i2c_set_regs(client, offs, regs,
397                  ISL1208_ALARM_SECTION_LEN);
398    if (err < 0) {
399        dev_err(&client->dev, "%s: writing ALARM section failed\n",
400            __func__);
401        return err;
402    }
403
404    err = isl1208_rtc_toggle_alarm(client, enable);
405    if (err)
406        return err;
407
408    return 0;
409}
410
411static int
412isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
413{
414    return isl1208_i2c_read_time(to_i2c_client(dev), tm);
415}
416
417static int
418isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
419{
420    int sr;
421    u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
422
423    /* The clock has an 8 bit wide bcd-coded register (they never learn)
424     * for the year. tm_year is an offset from 1900 and we are interested
425     * in the 2000-2099 range, so any value less than 100 is invalid.
426     */
427    if (tm->tm_year < 100)
428        return -EINVAL;
429
430    regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
431    regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
432    regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
433
434    regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
435    regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
436    regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
437
438    regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
439
440    sr = isl1208_i2c_get_sr(client);
441    if (sr < 0) {
442        dev_err(&client->dev, "%s: reading SR failed\n", __func__);
443        return sr;
444    }
445
446    /* set WRTC */
447    sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
448                       sr | ISL1208_REG_SR_WRTC);
449    if (sr < 0) {
450        dev_err(&client->dev, "%s: writing SR failed\n", __func__);
451        return sr;
452    }
453
454    /* write RTC registers */
455    sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
456    if (sr < 0) {
457        dev_err(&client->dev, "%s: writing RTC section failed\n",
458            __func__);
459        return sr;
460    }
461
462    /* clear WRTC again */
463    sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
464                       sr & ~ISL1208_REG_SR_WRTC);
465    if (sr < 0) {
466        dev_err(&client->dev, "%s: writing SR failed\n", __func__);
467        return sr;
468    }
469
470    return 0;
471}
472
473
474static int
475isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
476{
477    return isl1208_i2c_set_time(to_i2c_client(dev), tm);
478}
479
480static int
481isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
482{
483    return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
484}
485
486static int
487isl1208_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
488{
489    return isl1208_i2c_set_alarm(to_i2c_client(dev), alarm);
490}
491
492static irqreturn_t
493isl1208_rtc_interrupt(int irq, void *data)
494{
495    unsigned long timeout = jiffies + msecs_to_jiffies(1000);
496    struct i2c_client *client = data;
497    int handled = 0, sr, err;
498
499    /*
500     * I2C reads get NAK'ed if we read straight away after an interrupt?
501     * Using a mdelay/msleep didn't seem to help either, so we work around
502     * this by continually trying to read the register for a short time.
503     */
504    while (1) {
505        sr = isl1208_i2c_get_sr(client);
506        if (sr >= 0)
507            break;
508
509        if (time_after(jiffies, timeout)) {
510            dev_err(&client->dev, "%s: reading SR failed\n",
511                __func__);
512            return sr;
513        }
514    }
515
516    if (sr & ISL1208_REG_SR_ALM) {
517        dev_dbg(&client->dev, "alarm!\n");
518
519        /* Clear the alarm */
520        sr &= ~ISL1208_REG_SR_ALM;
521        sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR, sr);
522        if (sr < 0)
523            dev_err(&client->dev, "%s: writing SR failed\n",
524                __func__);
525        else
526            handled = 1;
527
528        /* Disable the alarm */
529        err = isl1208_rtc_toggle_alarm(client, 0);
530        if (err)
531            return err;
532    }
533
534    return handled ? IRQ_HANDLED : IRQ_NONE;
535}
536
537static const struct rtc_class_ops isl1208_rtc_ops = {
538    .proc = isl1208_rtc_proc,
539    .read_time = isl1208_rtc_read_time,
540    .set_time = isl1208_rtc_set_time,
541    .read_alarm = isl1208_rtc_read_alarm,
542    .set_alarm = isl1208_rtc_set_alarm,
543};
544
545/* sysfs interface */
546
547static ssize_t
548isl1208_sysfs_show_atrim(struct device *dev,
549             struct device_attribute *attr, char *buf)
550{
551    int atr = isl1208_i2c_get_atr(to_i2c_client(dev));
552    if (atr < 0)
553        return atr;
554
555    return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);
556}
557
558static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
559
560static ssize_t
561isl1208_sysfs_show_dtrim(struct device *dev,
562             struct device_attribute *attr, char *buf)
563{
564    int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev));
565    if (dtr < 0)
566        return dtr;
567
568    return sprintf(buf, "%d ppm\n", dtr);
569}
570
571static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
572
573static ssize_t
574isl1208_sysfs_show_usr(struct device *dev,
575               struct device_attribute *attr, char *buf)
576{
577    int usr = isl1208_i2c_get_usr(to_i2c_client(dev));
578    if (usr < 0)
579        return usr;
580
581    return sprintf(buf, "0x%.4x\n", usr);
582}
583
584static ssize_t
585isl1208_sysfs_store_usr(struct device *dev,
586            struct device_attribute *attr,
587            const char *buf, size_t count)
588{
589    int usr = -1;
590
591    if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
592        if (sscanf(buf, "%x", &usr) != 1)
593            return -EINVAL;
594    } else {
595        if (sscanf(buf, "%d", &usr) != 1)
596            return -EINVAL;
597    }
598
599    if (usr < 0 || usr > 0xffff)
600        return -EINVAL;
601
602    return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count;
603}
604
605static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
606           isl1208_sysfs_store_usr);
607
608static struct attribute *isl1208_rtc_attrs[] = {
609    &dev_attr_atrim.attr,
610    &dev_attr_dtrim.attr,
611    &dev_attr_usr.attr,
612    NULL
613};
614
615static const struct attribute_group isl1208_rtc_sysfs_files = {
616    .attrs = isl1208_rtc_attrs,
617};
618
619static int
620isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
621{
622    int rc = 0;
623    struct rtc_device *rtc;
624
625    if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
626        return -ENODEV;
627
628    if (isl1208_i2c_validate_client(client) < 0)
629        return -ENODEV;
630
631    dev_info(&client->dev,
632         "chip found, driver version " DRV_VERSION "\n");
633
634    if (client->irq > 0) {
635        rc = request_threaded_irq(client->irq, NULL,
636                      isl1208_rtc_interrupt,
637                      IRQF_SHARED,
638                      isl1208_driver.driver.name, client);
639        if (!rc) {
640            device_init_wakeup(&client->dev, 1);
641            enable_irq_wake(client->irq);
642        } else {
643            dev_err(&client->dev,
644                "Unable to request irq %d, no alarm support\n",
645                client->irq);
646            client->irq = 0;
647        }
648    }
649
650    rtc = rtc_device_register(isl1208_driver.driver.name,
651                  &client->dev, &isl1208_rtc_ops,
652                  THIS_MODULE);
653    if (IS_ERR(rtc)) {
654        rc = PTR_ERR(rtc);
655        goto exit_free_irq;
656    }
657
658    i2c_set_clientdata(client, rtc);
659
660    rc = isl1208_i2c_get_sr(client);
661    if (rc < 0) {
662        dev_err(&client->dev, "reading status failed\n");
663        goto exit_unregister;
664    }
665
666    if (rc & ISL1208_REG_SR_RTCF)
667        dev_warn(&client->dev, "rtc power failure detected, "
668             "please set clock.\n");
669
670    rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
671    if (rc)
672        goto exit_unregister;
673
674    return 0;
675
676exit_unregister:
677    rtc_device_unregister(rtc);
678exit_free_irq:
679    if (client->irq)
680        free_irq(client->irq, client);
681
682    return rc;
683}
684
685static int
686isl1208_remove(struct i2c_client *client)
687{
688    struct rtc_device *rtc = i2c_get_clientdata(client);
689
690    sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
691    rtc_device_unregister(rtc);
692    if (client->irq)
693        free_irq(client->irq, client);
694
695    return 0;
696}
697
698static const struct i2c_device_id isl1208_id[] = {
699    { "isl1208", 0 },
700    { }
701};
702MODULE_DEVICE_TABLE(i2c, isl1208_id);
703
704static struct i2c_driver isl1208_driver = {
705    .driver = {
706           .name = "rtc-isl1208",
707           },
708    .probe = isl1208_probe,
709    .remove = isl1208_remove,
710    .id_table = isl1208_id,
711};
712
713module_i2c_driver(isl1208_driver);
714
715MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
716MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
717MODULE_LICENSE("GPL");
718MODULE_VERSION(DRV_VERSION);
719

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