Commit | Line | Data |
---|---|---|
1abb0dc9 DB |
1 | /* |
2 | * rtc-ds1307.c - RTC driver for some mostly-compatible I2C chips. | |
3 | * | |
4 | * Copyright (C) 2005 James Chapman (ds1337 core) | |
5 | * Copyright (C) 2006 David Brownell | |
a2166858 | 6 | * Copyright (C) 2009 Matthias Fuchs (rx8025 support) |
1abb0dc9 DB |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/rtc.h> | |
19 | #include <linux/bcd.h> | |
eb86c306 | 20 | #include <linux/rtc/ds1307.h> |
1abb0dc9 | 21 | |
40ce972d DA |
22 | /* |
23 | * We can't determine type by probing, but if we expect pre-Linux code | |
1abb0dc9 DB |
24 | * to have set the chip up as a clock (turning on the oscillator and |
25 | * setting the date and time), Linux can ignore the non-clock features. | |
26 | * That's a natural job for a factory or repair bench. | |
1abb0dc9 DB |
27 | */ |
28 | enum ds_type { | |
045e0e85 DB |
29 | ds_1307, |
30 | ds_1337, | |
31 | ds_1338, | |
32 | ds_1339, | |
33 | ds_1340, | |
33df2ee1 | 34 | ds_1388, |
97f902b7 | 35 | ds_3231, |
045e0e85 | 36 | m41t00, |
43fcb815 | 37 | mcp7941x, |
a2166858 | 38 | rx_8025, |
32d322bc | 39 | last_ds_type /* always last */ |
40ce972d | 40 | /* rs5c372 too? different address... */ |
1abb0dc9 DB |
41 | }; |
42 | ||
1abb0dc9 DB |
43 | |
44 | /* RTC registers don't differ much, except for the century flag */ | |
45 | #define DS1307_REG_SECS 0x00 /* 00-59 */ | |
46 | # define DS1307_BIT_CH 0x80 | |
be5f59f4 | 47 | # define DS1340_BIT_nEOSC 0x80 |
43fcb815 | 48 | # define MCP7941X_BIT_ST 0x80 |
1abb0dc9 DB |
49 | #define DS1307_REG_MIN 0x01 /* 00-59 */ |
50 | #define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */ | |
c065f35c DB |
51 | # define DS1307_BIT_12HR 0x40 /* in REG_HOUR */ |
52 | # define DS1307_BIT_PM 0x20 /* in REG_HOUR */ | |
1abb0dc9 DB |
53 | # define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */ |
54 | # define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */ | |
55 | #define DS1307_REG_WDAY 0x03 /* 01-07 */ | |
43fcb815 | 56 | # define MCP7941X_BIT_VBATEN 0x08 |
1abb0dc9 DB |
57 | #define DS1307_REG_MDAY 0x04 /* 01-31 */ |
58 | #define DS1307_REG_MONTH 0x05 /* 01-12 */ | |
59 | # define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */ | |
60 | #define DS1307_REG_YEAR 0x06 /* 00-99 */ | |
61 | ||
40ce972d DA |
62 | /* |
63 | * Other registers (control, status, alarms, trickle charge, NVRAM, etc) | |
045e0e85 DB |
64 | * start at 7, and they differ a LOT. Only control and status matter for |
65 | * basic RTC date and time functionality; be careful using them. | |
1abb0dc9 | 66 | */ |
045e0e85 | 67 | #define DS1307_REG_CONTROL 0x07 /* or ds1338 */ |
1abb0dc9 | 68 | # define DS1307_BIT_OUT 0x80 |
be5f59f4 | 69 | # define DS1338_BIT_OSF 0x20 |
1abb0dc9 DB |
70 | # define DS1307_BIT_SQWE 0x10 |
71 | # define DS1307_BIT_RS1 0x02 | |
72 | # define DS1307_BIT_RS0 0x01 | |
73 | #define DS1337_REG_CONTROL 0x0e | |
74 | # define DS1337_BIT_nEOSC 0x80 | |
cb49a5e9 | 75 | # define DS1339_BIT_BBSQI 0x20 |
97f902b7 | 76 | # define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */ |
1abb0dc9 DB |
77 | # define DS1337_BIT_RS2 0x10 |
78 | # define DS1337_BIT_RS1 0x08 | |
79 | # define DS1337_BIT_INTCN 0x04 | |
80 | # define DS1337_BIT_A2IE 0x02 | |
81 | # define DS1337_BIT_A1IE 0x01 | |
045e0e85 DB |
82 | #define DS1340_REG_CONTROL 0x07 |
83 | # define DS1340_BIT_OUT 0x80 | |
84 | # define DS1340_BIT_FT 0x40 | |
85 | # define DS1340_BIT_CALIB_SIGN 0x20 | |
86 | # define DS1340_M_CALIBRATION 0x1f | |
be5f59f4 RG |
87 | #define DS1340_REG_FLAG 0x09 |
88 | # define DS1340_BIT_OSF 0x80 | |
1abb0dc9 DB |
89 | #define DS1337_REG_STATUS 0x0f |
90 | # define DS1337_BIT_OSF 0x80 | |
91 | # define DS1337_BIT_A2I 0x02 | |
92 | # define DS1337_BIT_A1I 0x01 | |
cb49a5e9 | 93 | #define DS1339_REG_ALARM1_SECS 0x07 |
eb86c306 WS |
94 | |
95 | #define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0 | |
1abb0dc9 | 96 | |
a2166858 MF |
97 | #define RX8025_REG_CTRL1 0x0e |
98 | # define RX8025_BIT_2412 0x20 | |
99 | #define RX8025_REG_CTRL2 0x0f | |
100 | # define RX8025_BIT_PON 0x10 | |
101 | # define RX8025_BIT_VDET 0x40 | |
102 | # define RX8025_BIT_XST 0x20 | |
1abb0dc9 DB |
103 | |
104 | ||
105 | struct ds1307 { | |
33df2ee1 | 106 | u8 offset; /* register's offset */ |
cb49a5e9 | 107 | u8 regs[11]; |
9eab0a78 AB |
108 | u16 nvram_offset; |
109 | struct bin_attribute *nvram; | |
1abb0dc9 | 110 | enum ds_type type; |
cb49a5e9 RG |
111 | unsigned long flags; |
112 | #define HAS_NVRAM 0 /* bit 0 == sysfs file active */ | |
113 | #define HAS_ALARM 1 /* bit 1 == irq claimed */ | |
045e0e85 | 114 | struct i2c_client *client; |
1abb0dc9 | 115 | struct rtc_device *rtc; |
cb49a5e9 | 116 | struct work_struct work; |
0cc43a18 | 117 | s32 (*read_block_data)(const struct i2c_client *client, u8 command, |
30e7b039 | 118 | u8 length, u8 *values); |
0cc43a18 | 119 | s32 (*write_block_data)(const struct i2c_client *client, u8 command, |
30e7b039 | 120 | u8 length, const u8 *values); |
1abb0dc9 DB |
121 | }; |
122 | ||
045e0e85 | 123 | struct chip_desc { |
045e0e85 | 124 | unsigned alarm:1; |
9eab0a78 AB |
125 | u16 nvram_offset; |
126 | u16 nvram_size; | |
eb86c306 | 127 | u16 trickle_charger_reg; |
045e0e85 DB |
128 | }; |
129 | ||
32d322bc WS |
130 | static const struct chip_desc chips[last_ds_type] = { |
131 | [ds_1307] = { | |
9eab0a78 AB |
132 | .nvram_offset = 8, |
133 | .nvram_size = 56, | |
32d322bc WS |
134 | }, |
135 | [ds_1337] = { | |
136 | .alarm = 1, | |
137 | }, | |
138 | [ds_1338] = { | |
9eab0a78 AB |
139 | .nvram_offset = 8, |
140 | .nvram_size = 56, | |
32d322bc WS |
141 | }, |
142 | [ds_1339] = { | |
143 | .alarm = 1, | |
eb86c306 WS |
144 | .trickle_charger_reg = 0x10, |
145 | }, | |
146 | [ds_1340] = { | |
147 | .trickle_charger_reg = 0x08, | |
148 | }, | |
149 | [ds_1388] = { | |
150 | .trickle_charger_reg = 0x0a, | |
32d322bc WS |
151 | }, |
152 | [ds_3231] = { | |
153 | .alarm = 1, | |
154 | }, | |
9eab0a78 AB |
155 | [mcp7941x] = { |
156 | /* this is battery backed SRAM */ | |
157 | .nvram_offset = 0x20, | |
158 | .nvram_size = 0x40, | |
159 | }, | |
32d322bc | 160 | }; |
045e0e85 | 161 | |
3760f736 JD |
162 | static const struct i2c_device_id ds1307_id[] = { |
163 | { "ds1307", ds_1307 }, | |
164 | { "ds1337", ds_1337 }, | |
165 | { "ds1338", ds_1338 }, | |
166 | { "ds1339", ds_1339 }, | |
33df2ee1 | 167 | { "ds1388", ds_1388 }, |
3760f736 | 168 | { "ds1340", ds_1340 }, |
97f902b7 | 169 | { "ds3231", ds_3231 }, |
3760f736 | 170 | { "m41t00", m41t00 }, |
43fcb815 | 171 | { "mcp7941x", mcp7941x }, |
31c1771c | 172 | { "pt7c4338", ds_1307 }, |
a2166858 | 173 | { "rx8025", rx_8025 }, |
3760f736 JD |
174 | { } |
175 | }; | |
176 | MODULE_DEVICE_TABLE(i2c, ds1307_id); | |
1abb0dc9 | 177 | |
cb49a5e9 RG |
178 | /*----------------------------------------------------------------------*/ |
179 | ||
30e7b039 ES |
180 | #define BLOCK_DATA_MAX_TRIES 10 |
181 | ||
0cc43a18 JD |
182 | static s32 ds1307_read_block_data_once(const struct i2c_client *client, |
183 | u8 command, u8 length, u8 *values) | |
30e7b039 ES |
184 | { |
185 | s32 i, data; | |
186 | ||
187 | for (i = 0; i < length; i++) { | |
188 | data = i2c_smbus_read_byte_data(client, command + i); | |
189 | if (data < 0) | |
190 | return data; | |
191 | values[i] = data; | |
192 | } | |
193 | return i; | |
194 | } | |
195 | ||
0cc43a18 | 196 | static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command, |
30e7b039 ES |
197 | u8 length, u8 *values) |
198 | { | |
199 | u8 oldvalues[I2C_SMBUS_BLOCK_MAX]; | |
200 | s32 ret; | |
201 | int tries = 0; | |
202 | ||
203 | dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length); | |
204 | ret = ds1307_read_block_data_once(client, command, length, values); | |
205 | if (ret < 0) | |
206 | return ret; | |
207 | do { | |
208 | if (++tries > BLOCK_DATA_MAX_TRIES) { | |
209 | dev_err(&client->dev, | |
210 | "ds1307_read_block_data failed\n"); | |
211 | return -EIO; | |
212 | } | |
213 | memcpy(oldvalues, values, length); | |
214 | ret = ds1307_read_block_data_once(client, command, length, | |
215 | values); | |
216 | if (ret < 0) | |
217 | return ret; | |
218 | } while (memcmp(oldvalues, values, length)); | |
219 | return length; | |
220 | } | |
221 | ||
0cc43a18 | 222 | static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command, |
30e7b039 ES |
223 | u8 length, const u8 *values) |
224 | { | |
225 | u8 currvalues[I2C_SMBUS_BLOCK_MAX]; | |
226 | int tries = 0; | |
227 | ||
228 | dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length); | |
229 | do { | |
230 | s32 i, ret; | |
231 | ||
232 | if (++tries > BLOCK_DATA_MAX_TRIES) { | |
233 | dev_err(&client->dev, | |
234 | "ds1307_write_block_data failed\n"); | |
235 | return -EIO; | |
236 | } | |
237 | for (i = 0; i < length; i++) { | |
238 | ret = i2c_smbus_write_byte_data(client, command + i, | |
239 | values[i]); | |
240 | if (ret < 0) | |
241 | return ret; | |
242 | } | |
243 | ret = ds1307_read_block_data_once(client, command, length, | |
244 | currvalues); | |
245 | if (ret < 0) | |
246 | return ret; | |
247 | } while (memcmp(currvalues, values, length)); | |
248 | return length; | |
249 | } | |
250 | ||
251 | /*----------------------------------------------------------------------*/ | |
252 | ||
cb49a5e9 RG |
253 | /* |
254 | * The IRQ logic includes a "real" handler running in IRQ context just | |
255 | * long enough to schedule this workqueue entry. We need a task context | |
256 | * to talk to the RTC, since I2C I/O calls require that; and disable the | |
257 | * IRQ until we clear its status on the chip, so that this handler can | |
258 | * work with any type of triggering (not just falling edge). | |
259 | * | |
260 | * The ds1337 and ds1339 both have two alarms, but we only use the first | |
261 | * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm | |
262 | * signal; ds1339 chips have only one alarm signal. | |
263 | */ | |
264 | static void ds1307_work(struct work_struct *work) | |
265 | { | |
266 | struct ds1307 *ds1307; | |
267 | struct i2c_client *client; | |
268 | struct mutex *lock; | |
269 | int stat, control; | |
270 | ||
271 | ds1307 = container_of(work, struct ds1307, work); | |
272 | client = ds1307->client; | |
273 | lock = &ds1307->rtc->ops_lock; | |
274 | ||
275 | mutex_lock(lock); | |
276 | stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS); | |
277 | if (stat < 0) | |
278 | goto out; | |
279 | ||
280 | if (stat & DS1337_BIT_A1I) { | |
281 | stat &= ~DS1337_BIT_A1I; | |
282 | i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat); | |
283 | ||
284 | control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); | |
285 | if (control < 0) | |
286 | goto out; | |
287 | ||
288 | control &= ~DS1337_BIT_A1IE; | |
289 | i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control); | |
290 | ||
cb49a5e9 | 291 | rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); |
cb49a5e9 RG |
292 | } |
293 | ||
294 | out: | |
295 | if (test_bit(HAS_ALARM, &ds1307->flags)) | |
296 | enable_irq(client->irq); | |
297 | mutex_unlock(lock); | |
298 | } | |
299 | ||
300 | static irqreturn_t ds1307_irq(int irq, void *dev_id) | |
301 | { | |
302 | struct i2c_client *client = dev_id; | |
303 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
304 | ||
305 | disable_irq_nosync(irq); | |
306 | schedule_work(&ds1307->work); | |
307 | return IRQ_HANDLED; | |
308 | } | |
309 | ||
310 | /*----------------------------------------------------------------------*/ | |
311 | ||
1abb0dc9 DB |
312 | static int ds1307_get_time(struct device *dev, struct rtc_time *t) |
313 | { | |
314 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
315 | int tmp; | |
316 | ||
045e0e85 | 317 | /* read the RTC date and time registers all at once */ |
30e7b039 | 318 | tmp = ds1307->read_block_data(ds1307->client, |
33df2ee1 | 319 | ds1307->offset, 7, ds1307->regs); |
fed40b73 | 320 | if (tmp != 7) { |
1abb0dc9 DB |
321 | dev_err(dev, "%s error %d\n", "read", tmp); |
322 | return -EIO; | |
323 | } | |
324 | ||
01a4ca16 | 325 | dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs); |
1abb0dc9 | 326 | |
fe20ba70 AB |
327 | t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f); |
328 | t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f); | |
1abb0dc9 | 329 | tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f; |
fe20ba70 AB |
330 | t->tm_hour = bcd2bin(tmp); |
331 | t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1; | |
332 | t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f); | |
1abb0dc9 | 333 | tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f; |
fe20ba70 | 334 | t->tm_mon = bcd2bin(tmp) - 1; |
1abb0dc9 DB |
335 | |
336 | /* assume 20YY not 19YY, and ignore DS1337_BIT_CENTURY */ | |
fe20ba70 | 337 | t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100; |
1abb0dc9 DB |
338 | |
339 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
340 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", | |
341 | "read", t->tm_sec, t->tm_min, | |
342 | t->tm_hour, t->tm_mday, | |
343 | t->tm_mon, t->tm_year, t->tm_wday); | |
344 | ||
045e0e85 DB |
345 | /* initial clock setting can be undefined */ |
346 | return rtc_valid_tm(t); | |
1abb0dc9 DB |
347 | } |
348 | ||
349 | static int ds1307_set_time(struct device *dev, struct rtc_time *t) | |
350 | { | |
351 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
352 | int result; | |
353 | int tmp; | |
354 | u8 *buf = ds1307->regs; | |
355 | ||
356 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
357 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", | |
11966adc JG |
358 | "write", t->tm_sec, t->tm_min, |
359 | t->tm_hour, t->tm_mday, | |
360 | t->tm_mon, t->tm_year, t->tm_wday); | |
1abb0dc9 | 361 | |
fe20ba70 AB |
362 | buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec); |
363 | buf[DS1307_REG_MIN] = bin2bcd(t->tm_min); | |
364 | buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour); | |
365 | buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1); | |
366 | buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday); | |
367 | buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1); | |
1abb0dc9 DB |
368 | |
369 | /* assume 20YY not 19YY */ | |
370 | tmp = t->tm_year - 100; | |
fe20ba70 | 371 | buf[DS1307_REG_YEAR] = bin2bcd(tmp); |
1abb0dc9 | 372 | |
be5f59f4 RG |
373 | switch (ds1307->type) { |
374 | case ds_1337: | |
375 | case ds_1339: | |
97f902b7 | 376 | case ds_3231: |
1abb0dc9 | 377 | buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY; |
be5f59f4 RG |
378 | break; |
379 | case ds_1340: | |
1abb0dc9 DB |
380 | buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN |
381 | | DS1340_BIT_CENTURY; | |
be5f59f4 | 382 | break; |
43fcb815 | 383 | case mcp7941x: |
40ce972d DA |
384 | /* |
385 | * these bits were cleared when preparing the date/time | |
386 | * values and need to be set again before writing the | |
387 | * buffer out to the device. | |
388 | */ | |
43fcb815 DA |
389 | buf[DS1307_REG_SECS] |= MCP7941X_BIT_ST; |
390 | buf[DS1307_REG_WDAY] |= MCP7941X_BIT_VBATEN; | |
391 | break; | |
be5f59f4 RG |
392 | default: |
393 | break; | |
394 | } | |
1abb0dc9 | 395 | |
01a4ca16 | 396 | dev_dbg(dev, "%s: %7ph\n", "write", buf); |
1abb0dc9 | 397 | |
33df2ee1 JT |
398 | result = ds1307->write_block_data(ds1307->client, |
399 | ds1307->offset, 7, buf); | |
fed40b73 BS |
400 | if (result < 0) { |
401 | dev_err(dev, "%s error %d\n", "write", result); | |
402 | return result; | |
1abb0dc9 DB |
403 | } |
404 | return 0; | |
405 | } | |
406 | ||
74d88eb2 | 407 | static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
cb49a5e9 RG |
408 | { |
409 | struct i2c_client *client = to_i2c_client(dev); | |
410 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
411 | int ret; | |
412 | ||
413 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
414 | return -EINVAL; | |
415 | ||
416 | /* read all ALARM1, ALARM2, and status registers at once */ | |
30e7b039 | 417 | ret = ds1307->read_block_data(client, |
fed40b73 BS |
418 | DS1339_REG_ALARM1_SECS, 9, ds1307->regs); |
419 | if (ret != 9) { | |
cb49a5e9 RG |
420 | dev_err(dev, "%s error %d\n", "alarm read", ret); |
421 | return -EIO; | |
422 | } | |
423 | ||
424 | dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n", | |
425 | "alarm read", | |
426 | ds1307->regs[0], ds1307->regs[1], | |
427 | ds1307->regs[2], ds1307->regs[3], | |
428 | ds1307->regs[4], ds1307->regs[5], | |
429 | ds1307->regs[6], ds1307->regs[7], | |
430 | ds1307->regs[8]); | |
431 | ||
40ce972d DA |
432 | /* |
433 | * report alarm time (ALARM1); assume 24 hour and day-of-month modes, | |
cb49a5e9 RG |
434 | * and that all four fields are checked matches |
435 | */ | |
436 | t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f); | |
437 | t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f); | |
438 | t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f); | |
439 | t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f); | |
440 | t->time.tm_mon = -1; | |
441 | t->time.tm_year = -1; | |
442 | t->time.tm_wday = -1; | |
443 | t->time.tm_yday = -1; | |
444 | t->time.tm_isdst = -1; | |
445 | ||
446 | /* ... and status */ | |
447 | t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE); | |
448 | t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I); | |
449 | ||
450 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
451 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", | |
452 | "alarm read", t->time.tm_sec, t->time.tm_min, | |
453 | t->time.tm_hour, t->time.tm_mday, | |
454 | t->enabled, t->pending); | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
74d88eb2 | 459 | static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
cb49a5e9 | 460 | { |
40ce972d | 461 | struct i2c_client *client = to_i2c_client(dev); |
cb49a5e9 RG |
462 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
463 | unsigned char *buf = ds1307->regs; | |
464 | u8 control, status; | |
465 | int ret; | |
466 | ||
467 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
468 | return -EINVAL; | |
469 | ||
470 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
471 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", | |
472 | "alarm set", t->time.tm_sec, t->time.tm_min, | |
473 | t->time.tm_hour, t->time.tm_mday, | |
474 | t->enabled, t->pending); | |
475 | ||
476 | /* read current status of both alarms and the chip */ | |
30e7b039 | 477 | ret = ds1307->read_block_data(client, |
fed40b73 BS |
478 | DS1339_REG_ALARM1_SECS, 9, buf); |
479 | if (ret != 9) { | |
cb49a5e9 RG |
480 | dev_err(dev, "%s error %d\n", "alarm write", ret); |
481 | return -EIO; | |
482 | } | |
483 | control = ds1307->regs[7]; | |
484 | status = ds1307->regs[8]; | |
485 | ||
486 | dev_dbg(dev, "%s: %02x %02x %02x %02x, %02x %02x %02x, %02x %02x\n", | |
487 | "alarm set (old status)", | |
488 | ds1307->regs[0], ds1307->regs[1], | |
489 | ds1307->regs[2], ds1307->regs[3], | |
490 | ds1307->regs[4], ds1307->regs[5], | |
491 | ds1307->regs[6], control, status); | |
492 | ||
493 | /* set ALARM1, using 24 hour and day-of-month modes */ | |
cb49a5e9 RG |
494 | buf[0] = bin2bcd(t->time.tm_sec); |
495 | buf[1] = bin2bcd(t->time.tm_min); | |
496 | buf[2] = bin2bcd(t->time.tm_hour); | |
497 | buf[3] = bin2bcd(t->time.tm_mday); | |
498 | ||
499 | /* set ALARM2 to non-garbage */ | |
500 | buf[4] = 0; | |
501 | buf[5] = 0; | |
502 | buf[6] = 0; | |
503 | ||
504 | /* optionally enable ALARM1 */ | |
505 | buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE); | |
506 | if (t->enabled) { | |
507 | dev_dbg(dev, "alarm IRQ armed\n"); | |
508 | buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */ | |
509 | } | |
510 | buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I); | |
511 | ||
30e7b039 | 512 | ret = ds1307->write_block_data(client, |
fed40b73 BS |
513 | DS1339_REG_ALARM1_SECS, 9, buf); |
514 | if (ret < 0) { | |
cb49a5e9 | 515 | dev_err(dev, "can't set alarm time\n"); |
fed40b73 | 516 | return ret; |
cb49a5e9 RG |
517 | } |
518 | ||
519 | return 0; | |
520 | } | |
521 | ||
16380c15 | 522 | static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled) |
cb49a5e9 RG |
523 | { |
524 | struct i2c_client *client = to_i2c_client(dev); | |
525 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
526 | int ret; | |
527 | ||
16380c15 JS |
528 | if (!test_bit(HAS_ALARM, &ds1307->flags)) |
529 | return -ENOTTY; | |
cb49a5e9 | 530 | |
16380c15 JS |
531 | ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); |
532 | if (ret < 0) | |
533 | return ret; | |
cb49a5e9 | 534 | |
16380c15 | 535 | if (enabled) |
cb49a5e9 | 536 | ret |= DS1337_BIT_A1IE; |
16380c15 JS |
537 | else |
538 | ret &= ~DS1337_BIT_A1IE; | |
cb49a5e9 | 539 | |
16380c15 JS |
540 | ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret); |
541 | if (ret < 0) | |
542 | return ret; | |
cb49a5e9 RG |
543 | |
544 | return 0; | |
545 | } | |
546 | ||
ff8371ac | 547 | static const struct rtc_class_ops ds13xx_rtc_ops = { |
1abb0dc9 DB |
548 | .read_time = ds1307_get_time, |
549 | .set_time = ds1307_set_time, | |
74d88eb2 JR |
550 | .read_alarm = ds1337_read_alarm, |
551 | .set_alarm = ds1337_set_alarm, | |
16380c15 | 552 | .alarm_irq_enable = ds1307_alarm_irq_enable, |
1abb0dc9 DB |
553 | }; |
554 | ||
682d73f6 DB |
555 | /*----------------------------------------------------------------------*/ |
556 | ||
682d73f6 | 557 | static ssize_t |
2c3c8bea CW |
558 | ds1307_nvram_read(struct file *filp, struct kobject *kobj, |
559 | struct bin_attribute *attr, | |
682d73f6 DB |
560 | char *buf, loff_t off, size_t count) |
561 | { | |
562 | struct i2c_client *client; | |
563 | struct ds1307 *ds1307; | |
682d73f6 DB |
564 | int result; |
565 | ||
fcd8db00 | 566 | client = kobj_to_i2c_client(kobj); |
682d73f6 DB |
567 | ds1307 = i2c_get_clientdata(client); |
568 | ||
9eab0a78 | 569 | if (unlikely(off >= ds1307->nvram->size)) |
682d73f6 | 570 | return 0; |
9eab0a78 AB |
571 | if ((off + count) > ds1307->nvram->size) |
572 | count = ds1307->nvram->size - off; | |
682d73f6 DB |
573 | if (unlikely(!count)) |
574 | return count; | |
575 | ||
9eab0a78 AB |
576 | result = ds1307->read_block_data(client, ds1307->nvram_offset + off, |
577 | count, buf); | |
fed40b73 | 578 | if (result < 0) |
682d73f6 | 579 | dev_err(&client->dev, "%s error %d\n", "nvram read", result); |
fed40b73 | 580 | return result; |
682d73f6 DB |
581 | } |
582 | ||
583 | static ssize_t | |
2c3c8bea CW |
584 | ds1307_nvram_write(struct file *filp, struct kobject *kobj, |
585 | struct bin_attribute *attr, | |
682d73f6 DB |
586 | char *buf, loff_t off, size_t count) |
587 | { | |
588 | struct i2c_client *client; | |
30e7b039 | 589 | struct ds1307 *ds1307; |
fed40b73 | 590 | int result; |
682d73f6 | 591 | |
fcd8db00 | 592 | client = kobj_to_i2c_client(kobj); |
30e7b039 | 593 | ds1307 = i2c_get_clientdata(client); |
682d73f6 | 594 | |
9eab0a78 | 595 | if (unlikely(off >= ds1307->nvram->size)) |
682d73f6 | 596 | return -EFBIG; |
9eab0a78 AB |
597 | if ((off + count) > ds1307->nvram->size) |
598 | count = ds1307->nvram->size - off; | |
682d73f6 DB |
599 | if (unlikely(!count)) |
600 | return count; | |
601 | ||
9eab0a78 AB |
602 | result = ds1307->write_block_data(client, ds1307->nvram_offset + off, |
603 | count, buf); | |
fed40b73 BS |
604 | if (result < 0) { |
605 | dev_err(&client->dev, "%s error %d\n", "nvram write", result); | |
606 | return result; | |
607 | } | |
608 | return count; | |
682d73f6 DB |
609 | } |
610 | ||
682d73f6 DB |
611 | /*----------------------------------------------------------------------*/ |
612 | ||
5a167f45 GKH |
613 | static int ds1307_probe(struct i2c_client *client, |
614 | const struct i2c_device_id *id) | |
1abb0dc9 DB |
615 | { |
616 | struct ds1307 *ds1307; | |
617 | int err = -ENODEV; | |
1abb0dc9 | 618 | int tmp; |
3760f736 | 619 | const struct chip_desc *chip = &chips[id->driver_data]; |
c065f35c | 620 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
cb49a5e9 | 621 | int want_irq = false; |
fed40b73 | 622 | unsigned char *buf; |
eb86c306 | 623 | struct ds1307_platform_data *pdata = client->dev.platform_data; |
97f902b7 WS |
624 | static const int bbsqi_bitpos[] = { |
625 | [ds_1337] = 0, | |
626 | [ds_1339] = DS1339_BIT_BBSQI, | |
627 | [ds_3231] = DS3231_BIT_BBSQW, | |
628 | }; | |
1abb0dc9 | 629 | |
30e7b039 ES |
630 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA) |
631 | && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) | |
c065f35c DB |
632 | return -EIO; |
633 | ||
40ce972d DA |
634 | ds1307 = kzalloc(sizeof(struct ds1307), GFP_KERNEL); |
635 | if (!ds1307) | |
c065f35c | 636 | return -ENOMEM; |
045e0e85 | 637 | |
1abb0dc9 | 638 | i2c_set_clientdata(client, ds1307); |
33df2ee1 JT |
639 | |
640 | ds1307->client = client; | |
641 | ds1307->type = id->driver_data; | |
33df2ee1 | 642 | |
eb86c306 WS |
643 | if (pdata && pdata->trickle_charger_setup && chip->trickle_charger_reg) |
644 | i2c_smbus_write_byte_data(client, chip->trickle_charger_reg, | |
645 | DS13XX_TRICKLE_CHARGER_MAGIC | pdata->trickle_charger_setup); | |
646 | ||
fed40b73 | 647 | buf = ds1307->regs; |
30e7b039 ES |
648 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) { |
649 | ds1307->read_block_data = i2c_smbus_read_i2c_block_data; | |
650 | ds1307->write_block_data = i2c_smbus_write_i2c_block_data; | |
651 | } else { | |
652 | ds1307->read_block_data = ds1307_read_block_data; | |
653 | ds1307->write_block_data = ds1307_write_block_data; | |
654 | } | |
045e0e85 DB |
655 | |
656 | switch (ds1307->type) { | |
657 | case ds_1337: | |
658 | case ds_1339: | |
97f902b7 | 659 | case ds_3231: |
be5f59f4 | 660 | /* get registers that the "rtc" read below won't read... */ |
30e7b039 | 661 | tmp = ds1307->read_block_data(ds1307->client, |
fed40b73 | 662 | DS1337_REG_CONTROL, 2, buf); |
1abb0dc9 DB |
663 | if (tmp != 2) { |
664 | pr_debug("read error %d\n", tmp); | |
665 | err = -EIO; | |
666 | goto exit_free; | |
667 | } | |
668 | ||
be5f59f4 RG |
669 | /* oscillator off? turn it on, so clock can tick. */ |
670 | if (ds1307->regs[0] & DS1337_BIT_nEOSC) | |
cb49a5e9 RG |
671 | ds1307->regs[0] &= ~DS1337_BIT_nEOSC; |
672 | ||
40ce972d DA |
673 | /* |
674 | * Using IRQ? Disable the square wave and both alarms. | |
97f902b7 WS |
675 | * For some variants, be sure alarms can trigger when we're |
676 | * running on Vbackup (BBSQI/BBSQW) | |
cb49a5e9 | 677 | */ |
b24a7267 WS |
678 | if (ds1307->client->irq > 0 && chip->alarm) { |
679 | INIT_WORK(&ds1307->work, ds1307_work); | |
680 | ||
97f902b7 WS |
681 | ds1307->regs[0] |= DS1337_BIT_INTCN |
682 | | bbsqi_bitpos[ds1307->type]; | |
cb49a5e9 | 683 | ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE); |
b24a7267 WS |
684 | |
685 | want_irq = true; | |
cb49a5e9 RG |
686 | } |
687 | ||
688 | i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, | |
689 | ds1307->regs[0]); | |
be5f59f4 RG |
690 | |
691 | /* oscillator fault? clear flag, and warn */ | |
692 | if (ds1307->regs[1] & DS1337_BIT_OSF) { | |
693 | i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, | |
694 | ds1307->regs[1] & ~DS1337_BIT_OSF); | |
695 | dev_warn(&client->dev, "SET TIME!\n"); | |
1abb0dc9 | 696 | } |
045e0e85 | 697 | break; |
a2166858 MF |
698 | |
699 | case rx_8025: | |
700 | tmp = i2c_smbus_read_i2c_block_data(ds1307->client, | |
701 | RX8025_REG_CTRL1 << 4 | 0x08, 2, buf); | |
702 | if (tmp != 2) { | |
703 | pr_debug("read error %d\n", tmp); | |
704 | err = -EIO; | |
705 | goto exit_free; | |
706 | } | |
707 | ||
708 | /* oscillator off? turn it on, so clock can tick. */ | |
709 | if (!(ds1307->regs[1] & RX8025_BIT_XST)) { | |
710 | ds1307->regs[1] |= RX8025_BIT_XST; | |
711 | i2c_smbus_write_byte_data(client, | |
712 | RX8025_REG_CTRL2 << 4 | 0x08, | |
713 | ds1307->regs[1]); | |
714 | dev_warn(&client->dev, | |
715 | "oscillator stop detected - SET TIME!\n"); | |
716 | } | |
717 | ||
718 | if (ds1307->regs[1] & RX8025_BIT_PON) { | |
719 | ds1307->regs[1] &= ~RX8025_BIT_PON; | |
720 | i2c_smbus_write_byte_data(client, | |
721 | RX8025_REG_CTRL2 << 4 | 0x08, | |
722 | ds1307->regs[1]); | |
723 | dev_warn(&client->dev, "power-on detected\n"); | |
724 | } | |
725 | ||
726 | if (ds1307->regs[1] & RX8025_BIT_VDET) { | |
727 | ds1307->regs[1] &= ~RX8025_BIT_VDET; | |
728 | i2c_smbus_write_byte_data(client, | |
729 | RX8025_REG_CTRL2 << 4 | 0x08, | |
730 | ds1307->regs[1]); | |
731 | dev_warn(&client->dev, "voltage drop detected\n"); | |
732 | } | |
733 | ||
734 | /* make sure we are running in 24hour mode */ | |
735 | if (!(ds1307->regs[0] & RX8025_BIT_2412)) { | |
736 | u8 hour; | |
737 | ||
738 | /* switch to 24 hour mode */ | |
739 | i2c_smbus_write_byte_data(client, | |
740 | RX8025_REG_CTRL1 << 4 | 0x08, | |
741 | ds1307->regs[0] | | |
742 | RX8025_BIT_2412); | |
743 | ||
744 | tmp = i2c_smbus_read_i2c_block_data(ds1307->client, | |
745 | RX8025_REG_CTRL1 << 4 | 0x08, 2, buf); | |
746 | if (tmp != 2) { | |
747 | pr_debug("read error %d\n", tmp); | |
748 | err = -EIO; | |
749 | goto exit_free; | |
750 | } | |
751 | ||
752 | /* correct hour */ | |
753 | hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]); | |
754 | if (hour == 12) | |
755 | hour = 0; | |
756 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) | |
757 | hour += 12; | |
758 | ||
759 | i2c_smbus_write_byte_data(client, | |
760 | DS1307_REG_HOUR << 4 | 0x08, | |
761 | hour); | |
762 | } | |
763 | break; | |
33df2ee1 JT |
764 | case ds_1388: |
765 | ds1307->offset = 1; /* Seconds starts at 1 */ | |
766 | break; | |
045e0e85 DB |
767 | default: |
768 | break; | |
769 | } | |
1abb0dc9 DB |
770 | |
771 | read_rtc: | |
772 | /* read RTC registers */ | |
96fc3a45 | 773 | tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf); |
fed40b73 | 774 | if (tmp != 8) { |
1abb0dc9 DB |
775 | pr_debug("read error %d\n", tmp); |
776 | err = -EIO; | |
777 | goto exit_free; | |
778 | } | |
779 | ||
40ce972d DA |
780 | /* |
781 | * minimal sanity checking; some chips (like DS1340) don't | |
1abb0dc9 DB |
782 | * specify the extra bits as must-be-zero, but there are |
783 | * still a few values that are clearly out-of-range. | |
784 | */ | |
785 | tmp = ds1307->regs[DS1307_REG_SECS]; | |
045e0e85 DB |
786 | switch (ds1307->type) { |
787 | case ds_1307: | |
045e0e85 | 788 | case m41t00: |
be5f59f4 | 789 | /* clock halted? turn it on, so clock can tick. */ |
045e0e85 | 790 | if (tmp & DS1307_BIT_CH) { |
be5f59f4 RG |
791 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); |
792 | dev_warn(&client->dev, "SET TIME!\n"); | |
045e0e85 | 793 | goto read_rtc; |
1abb0dc9 | 794 | } |
045e0e85 | 795 | break; |
be5f59f4 RG |
796 | case ds_1338: |
797 | /* clock halted? turn it on, so clock can tick. */ | |
045e0e85 | 798 | if (tmp & DS1307_BIT_CH) |
be5f59f4 RG |
799 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); |
800 | ||
801 | /* oscillator fault? clear flag, and warn */ | |
802 | if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) { | |
803 | i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL, | |
bd16f9eb | 804 | ds1307->regs[DS1307_REG_CONTROL] |
be5f59f4 RG |
805 | & ~DS1338_BIT_OSF); |
806 | dev_warn(&client->dev, "SET TIME!\n"); | |
807 | goto read_rtc; | |
808 | } | |
045e0e85 | 809 | break; |
fcd8db00 R |
810 | case ds_1340: |
811 | /* clock halted? turn it on, so clock can tick. */ | |
812 | if (tmp & DS1340_BIT_nEOSC) | |
813 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); | |
814 | ||
815 | tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG); | |
816 | if (tmp < 0) { | |
817 | pr_debug("read error %d\n", tmp); | |
818 | err = -EIO; | |
819 | goto exit_free; | |
820 | } | |
821 | ||
822 | /* oscillator fault? clear flag, and warn */ | |
823 | if (tmp & DS1340_BIT_OSF) { | |
824 | i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0); | |
825 | dev_warn(&client->dev, "SET TIME!\n"); | |
826 | } | |
43fcb815 DA |
827 | break; |
828 | case mcp7941x: | |
829 | /* make sure that the backup battery is enabled */ | |
830 | if (!(ds1307->regs[DS1307_REG_WDAY] & MCP7941X_BIT_VBATEN)) { | |
831 | i2c_smbus_write_byte_data(client, DS1307_REG_WDAY, | |
832 | ds1307->regs[DS1307_REG_WDAY] | |
833 | | MCP7941X_BIT_VBATEN); | |
834 | } | |
835 | ||
836 | /* clock halted? turn it on, so clock can tick. */ | |
837 | if (!(tmp & MCP7941X_BIT_ST)) { | |
838 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, | |
839 | MCP7941X_BIT_ST); | |
840 | dev_warn(&client->dev, "SET TIME!\n"); | |
841 | goto read_rtc; | |
842 | } | |
843 | ||
fcd8db00 | 844 | break; |
32d322bc | 845 | default: |
045e0e85 | 846 | break; |
1abb0dc9 | 847 | } |
045e0e85 | 848 | |
1abb0dc9 | 849 | tmp = ds1307->regs[DS1307_REG_HOUR]; |
c065f35c DB |
850 | switch (ds1307->type) { |
851 | case ds_1340: | |
852 | case m41t00: | |
40ce972d DA |
853 | /* |
854 | * NOTE: ignores century bits; fix before deploying | |
c065f35c DB |
855 | * systems that will run through year 2100. |
856 | */ | |
857 | break; | |
a2166858 MF |
858 | case rx_8025: |
859 | break; | |
c065f35c DB |
860 | default: |
861 | if (!(tmp & DS1307_BIT_12HR)) | |
862 | break; | |
863 | ||
40ce972d DA |
864 | /* |
865 | * Be sure we're in 24 hour mode. Multi-master systems | |
c065f35c DB |
866 | * take note... |
867 | */ | |
fe20ba70 | 868 | tmp = bcd2bin(tmp & 0x1f); |
c065f35c DB |
869 | if (tmp == 12) |
870 | tmp = 0; | |
871 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) | |
872 | tmp += 12; | |
1abb0dc9 | 873 | i2c_smbus_write_byte_data(client, |
96fc3a45 | 874 | ds1307->offset + DS1307_REG_HOUR, |
fe20ba70 | 875 | bin2bcd(tmp)); |
1abb0dc9 DB |
876 | } |
877 | ||
1abb0dc9 DB |
878 | ds1307->rtc = rtc_device_register(client->name, &client->dev, |
879 | &ds13xx_rtc_ops, THIS_MODULE); | |
880 | if (IS_ERR(ds1307->rtc)) { | |
881 | err = PTR_ERR(ds1307->rtc); | |
882 | dev_err(&client->dev, | |
883 | "unable to register the class device\n"); | |
c065f35c | 884 | goto exit_free; |
1abb0dc9 DB |
885 | } |
886 | ||
cb49a5e9 | 887 | if (want_irq) { |
43d15bcd | 888 | err = request_irq(client->irq, ds1307_irq, IRQF_SHARED, |
cb49a5e9 RG |
889 | ds1307->rtc->name, client); |
890 | if (err) { | |
891 | dev_err(&client->dev, | |
892 | "unable to request IRQ!\n"); | |
893 | goto exit_irq; | |
894 | } | |
26b3c01f AV |
895 | |
896 | device_set_wakeup_capable(&client->dev, 1); | |
cb49a5e9 RG |
897 | set_bit(HAS_ALARM, &ds1307->flags); |
898 | dev_dbg(&client->dev, "got IRQ %d\n", client->irq); | |
899 | } | |
900 | ||
9eab0a78 AB |
901 | if (chip->nvram_size) { |
902 | ds1307->nvram = kzalloc(sizeof(struct bin_attribute), | |
903 | GFP_KERNEL); | |
904 | if (!ds1307->nvram) { | |
905 | err = -ENOMEM; | |
906 | goto exit_nvram; | |
907 | } | |
908 | ds1307->nvram->attr.name = "nvram"; | |
909 | ds1307->nvram->attr.mode = S_IRUGO | S_IWUSR; | |
3f5ec5e0 | 910 | sysfs_bin_attr_init(ds1307->nvram); |
9eab0a78 AB |
911 | ds1307->nvram->read = ds1307_nvram_read, |
912 | ds1307->nvram->write = ds1307_nvram_write, | |
913 | ds1307->nvram->size = chip->nvram_size; | |
914 | ds1307->nvram_offset = chip->nvram_offset; | |
915 | err = sysfs_create_bin_file(&client->dev.kobj, ds1307->nvram); | |
916 | if (err) { | |
917 | kfree(ds1307->nvram); | |
918 | goto exit_nvram; | |
682d73f6 | 919 | } |
9eab0a78 AB |
920 | set_bit(HAS_NVRAM, &ds1307->flags); |
921 | dev_info(&client->dev, "%zu bytes nvram\n", ds1307->nvram->size); | |
682d73f6 DB |
922 | } |
923 | ||
1abb0dc9 DB |
924 | return 0; |
925 | ||
9eab0a78 | 926 | exit_nvram: |
cb49a5e9 | 927 | exit_irq: |
72445af8 | 928 | rtc_device_unregister(ds1307->rtc); |
1abb0dc9 DB |
929 | exit_free: |
930 | kfree(ds1307); | |
1abb0dc9 DB |
931 | return err; |
932 | } | |
933 | ||
5a167f45 | 934 | static int ds1307_remove(struct i2c_client *client) |
1abb0dc9 | 935 | { |
40ce972d | 936 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
cb49a5e9 RG |
937 | |
938 | if (test_and_clear_bit(HAS_ALARM, &ds1307->flags)) { | |
939 | free_irq(client->irq, client); | |
940 | cancel_work_sync(&ds1307->work); | |
941 | } | |
1abb0dc9 | 942 | |
9eab0a78 AB |
943 | if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags)) { |
944 | sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram); | |
945 | kfree(ds1307->nvram); | |
946 | } | |
682d73f6 | 947 | |
1abb0dc9 | 948 | rtc_device_unregister(ds1307->rtc); |
1abb0dc9 DB |
949 | kfree(ds1307); |
950 | return 0; | |
951 | } | |
952 | ||
953 | static struct i2c_driver ds1307_driver = { | |
954 | .driver = { | |
c065f35c | 955 | .name = "rtc-ds1307", |
1abb0dc9 DB |
956 | .owner = THIS_MODULE, |
957 | }, | |
c065f35c | 958 | .probe = ds1307_probe, |
5a167f45 | 959 | .remove = ds1307_remove, |
3760f736 | 960 | .id_table = ds1307_id, |
1abb0dc9 DB |
961 | }; |
962 | ||
0abc9201 | 963 | module_i2c_driver(ds1307_driver); |
1abb0dc9 DB |
964 | |
965 | MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips"); | |
966 | MODULE_LICENSE("GPL"); |