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) |
bc48b902 | 7 | * Copyright (C) 2012 Bertrand Achard (nvram access fixes) |
1abb0dc9 DB |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
eac7237f NM |
14 | #include <linux/bcd.h> |
15 | #include <linux/i2c.h> | |
1abb0dc9 | 16 | #include <linux/init.h> |
eac7237f NM |
17 | #include <linux/module.h> |
18 | #include <linux/rtc/ds1307.h> | |
19 | #include <linux/rtc.h> | |
1abb0dc9 | 20 | #include <linux/slab.h> |
1abb0dc9 | 21 | #include <linux/string.h> |
445c0207 AM |
22 | #include <linux/hwmon.h> |
23 | #include <linux/hwmon-sysfs.h> | |
6c6ff145 | 24 | #include <linux/clk-provider.h> |
1abb0dc9 | 25 | |
40ce972d DA |
26 | /* |
27 | * We can't determine type by probing, but if we expect pre-Linux code | |
1abb0dc9 DB |
28 | * to have set the chip up as a clock (turning on the oscillator and |
29 | * setting the date and time), Linux can ignore the non-clock features. | |
30 | * That's a natural job for a factory or repair bench. | |
1abb0dc9 DB |
31 | */ |
32 | enum ds_type { | |
045e0e85 DB |
33 | ds_1307, |
34 | ds_1337, | |
35 | ds_1338, | |
36 | ds_1339, | |
37 | ds_1340, | |
33df2ee1 | 38 | ds_1388, |
97f902b7 | 39 | ds_3231, |
045e0e85 | 40 | m41t00, |
f4199f85 | 41 | mcp794xx, |
a2166858 | 42 | rx_8025, |
32d322bc | 43 | last_ds_type /* always last */ |
40ce972d | 44 | /* rs5c372 too? different address... */ |
1abb0dc9 DB |
45 | }; |
46 | ||
1abb0dc9 DB |
47 | |
48 | /* RTC registers don't differ much, except for the century flag */ | |
49 | #define DS1307_REG_SECS 0x00 /* 00-59 */ | |
50 | # define DS1307_BIT_CH 0x80 | |
be5f59f4 | 51 | # define DS1340_BIT_nEOSC 0x80 |
f4199f85 | 52 | # define MCP794XX_BIT_ST 0x80 |
1abb0dc9 DB |
53 | #define DS1307_REG_MIN 0x01 /* 00-59 */ |
54 | #define DS1307_REG_HOUR 0x02 /* 00-23, or 1-12{am,pm} */ | |
c065f35c DB |
55 | # define DS1307_BIT_12HR 0x40 /* in REG_HOUR */ |
56 | # define DS1307_BIT_PM 0x20 /* in REG_HOUR */ | |
1abb0dc9 DB |
57 | # define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */ |
58 | # define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */ | |
59 | #define DS1307_REG_WDAY 0x03 /* 01-07 */ | |
f4199f85 | 60 | # define MCP794XX_BIT_VBATEN 0x08 |
1abb0dc9 DB |
61 | #define DS1307_REG_MDAY 0x04 /* 01-31 */ |
62 | #define DS1307_REG_MONTH 0x05 /* 01-12 */ | |
63 | # define DS1337_BIT_CENTURY 0x80 /* in REG_MONTH */ | |
64 | #define DS1307_REG_YEAR 0x06 /* 00-99 */ | |
65 | ||
40ce972d DA |
66 | /* |
67 | * Other registers (control, status, alarms, trickle charge, NVRAM, etc) | |
045e0e85 DB |
68 | * start at 7, and they differ a LOT. Only control and status matter for |
69 | * basic RTC date and time functionality; be careful using them. | |
1abb0dc9 | 70 | */ |
045e0e85 | 71 | #define DS1307_REG_CONTROL 0x07 /* or ds1338 */ |
1abb0dc9 | 72 | # define DS1307_BIT_OUT 0x80 |
be5f59f4 | 73 | # define DS1338_BIT_OSF 0x20 |
1abb0dc9 DB |
74 | # define DS1307_BIT_SQWE 0x10 |
75 | # define DS1307_BIT_RS1 0x02 | |
76 | # define DS1307_BIT_RS0 0x01 | |
77 | #define DS1337_REG_CONTROL 0x0e | |
78 | # define DS1337_BIT_nEOSC 0x80 | |
cb49a5e9 | 79 | # define DS1339_BIT_BBSQI 0x20 |
97f902b7 | 80 | # define DS3231_BIT_BBSQW 0x40 /* same as BBSQI */ |
1abb0dc9 DB |
81 | # define DS1337_BIT_RS2 0x10 |
82 | # define DS1337_BIT_RS1 0x08 | |
83 | # define DS1337_BIT_INTCN 0x04 | |
84 | # define DS1337_BIT_A2IE 0x02 | |
85 | # define DS1337_BIT_A1IE 0x01 | |
045e0e85 DB |
86 | #define DS1340_REG_CONTROL 0x07 |
87 | # define DS1340_BIT_OUT 0x80 | |
88 | # define DS1340_BIT_FT 0x40 | |
89 | # define DS1340_BIT_CALIB_SIGN 0x20 | |
90 | # define DS1340_M_CALIBRATION 0x1f | |
be5f59f4 RG |
91 | #define DS1340_REG_FLAG 0x09 |
92 | # define DS1340_BIT_OSF 0x80 | |
1abb0dc9 DB |
93 | #define DS1337_REG_STATUS 0x0f |
94 | # define DS1337_BIT_OSF 0x80 | |
6c6ff145 | 95 | # define DS3231_BIT_EN32KHZ 0x08 |
1abb0dc9 DB |
96 | # define DS1337_BIT_A2I 0x02 |
97 | # define DS1337_BIT_A1I 0x01 | |
cb49a5e9 | 98 | #define DS1339_REG_ALARM1_SECS 0x07 |
eb86c306 WS |
99 | |
100 | #define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0 | |
1abb0dc9 | 101 | |
a2166858 MF |
102 | #define RX8025_REG_CTRL1 0x0e |
103 | # define RX8025_BIT_2412 0x20 | |
104 | #define RX8025_REG_CTRL2 0x0f | |
105 | # define RX8025_BIT_PON 0x10 | |
106 | # define RX8025_BIT_VDET 0x40 | |
107 | # define RX8025_BIT_XST 0x20 | |
1abb0dc9 DB |
108 | |
109 | ||
110 | struct ds1307 { | |
33df2ee1 | 111 | u8 offset; /* register's offset */ |
cb49a5e9 | 112 | u8 regs[11]; |
9eab0a78 AB |
113 | u16 nvram_offset; |
114 | struct bin_attribute *nvram; | |
1abb0dc9 | 115 | enum ds_type type; |
cb49a5e9 RG |
116 | unsigned long flags; |
117 | #define HAS_NVRAM 0 /* bit 0 == sysfs file active */ | |
118 | #define HAS_ALARM 1 /* bit 1 == irq claimed */ | |
045e0e85 | 119 | struct i2c_client *client; |
1abb0dc9 | 120 | struct rtc_device *rtc; |
0cc43a18 | 121 | s32 (*read_block_data)(const struct i2c_client *client, u8 command, |
30e7b039 | 122 | u8 length, u8 *values); |
0cc43a18 | 123 | s32 (*write_block_data)(const struct i2c_client *client, u8 command, |
30e7b039 | 124 | u8 length, const u8 *values); |
6c6ff145 AM |
125 | #ifdef CONFIG_COMMON_CLK |
126 | struct clk_hw clks[2]; | |
127 | #endif | |
1abb0dc9 DB |
128 | }; |
129 | ||
045e0e85 | 130 | struct chip_desc { |
045e0e85 | 131 | unsigned alarm:1; |
9eab0a78 AB |
132 | u16 nvram_offset; |
133 | u16 nvram_size; | |
eb86c306 | 134 | u16 trickle_charger_reg; |
33b04b7b MV |
135 | u8 trickle_charger_setup; |
136 | u8 (*do_trickle_setup)(struct i2c_client *, uint32_t, bool); | |
045e0e85 DB |
137 | }; |
138 | ||
33b04b7b MV |
139 | static u8 do_trickle_setup_ds1339(struct i2c_client *, |
140 | uint32_t ohms, bool diode); | |
141 | ||
142 | static struct chip_desc chips[last_ds_type] = { | |
32d322bc | 143 | [ds_1307] = { |
9eab0a78 AB |
144 | .nvram_offset = 8, |
145 | .nvram_size = 56, | |
32d322bc WS |
146 | }, |
147 | [ds_1337] = { | |
148 | .alarm = 1, | |
149 | }, | |
150 | [ds_1338] = { | |
9eab0a78 AB |
151 | .nvram_offset = 8, |
152 | .nvram_size = 56, | |
32d322bc WS |
153 | }, |
154 | [ds_1339] = { | |
155 | .alarm = 1, | |
eb86c306 | 156 | .trickle_charger_reg = 0x10, |
33b04b7b | 157 | .do_trickle_setup = &do_trickle_setup_ds1339, |
eb86c306 WS |
158 | }, |
159 | [ds_1340] = { | |
160 | .trickle_charger_reg = 0x08, | |
161 | }, | |
162 | [ds_1388] = { | |
163 | .trickle_charger_reg = 0x0a, | |
32d322bc WS |
164 | }, |
165 | [ds_3231] = { | |
166 | .alarm = 1, | |
167 | }, | |
f4199f85 | 168 | [mcp794xx] = { |
1d1945d2 | 169 | .alarm = 1, |
9eab0a78 AB |
170 | /* this is battery backed SRAM */ |
171 | .nvram_offset = 0x20, | |
172 | .nvram_size = 0x40, | |
173 | }, | |
32d322bc | 174 | }; |
045e0e85 | 175 | |
3760f736 JD |
176 | static const struct i2c_device_id ds1307_id[] = { |
177 | { "ds1307", ds_1307 }, | |
178 | { "ds1337", ds_1337 }, | |
179 | { "ds1338", ds_1338 }, | |
180 | { "ds1339", ds_1339 }, | |
33df2ee1 | 181 | { "ds1388", ds_1388 }, |
3760f736 | 182 | { "ds1340", ds_1340 }, |
97f902b7 | 183 | { "ds3231", ds_3231 }, |
3760f736 | 184 | { "m41t00", m41t00 }, |
f4199f85 TN |
185 | { "mcp7940x", mcp794xx }, |
186 | { "mcp7941x", mcp794xx }, | |
31c1771c | 187 | { "pt7c4338", ds_1307 }, |
a2166858 | 188 | { "rx8025", rx_8025 }, |
3760f736 JD |
189 | { } |
190 | }; | |
191 | MODULE_DEVICE_TABLE(i2c, ds1307_id); | |
1abb0dc9 | 192 | |
cb49a5e9 RG |
193 | /*----------------------------------------------------------------------*/ |
194 | ||
30e7b039 ES |
195 | #define BLOCK_DATA_MAX_TRIES 10 |
196 | ||
0cc43a18 JD |
197 | static s32 ds1307_read_block_data_once(const struct i2c_client *client, |
198 | u8 command, u8 length, u8 *values) | |
30e7b039 ES |
199 | { |
200 | s32 i, data; | |
201 | ||
202 | for (i = 0; i < length; i++) { | |
203 | data = i2c_smbus_read_byte_data(client, command + i); | |
204 | if (data < 0) | |
205 | return data; | |
206 | values[i] = data; | |
207 | } | |
208 | return i; | |
209 | } | |
210 | ||
0cc43a18 | 211 | static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command, |
30e7b039 ES |
212 | u8 length, u8 *values) |
213 | { | |
bc48b902 | 214 | u8 oldvalues[255]; |
30e7b039 ES |
215 | s32 ret; |
216 | int tries = 0; | |
217 | ||
218 | dev_dbg(&client->dev, "ds1307_read_block_data (length=%d)\n", length); | |
219 | ret = ds1307_read_block_data_once(client, command, length, values); | |
220 | if (ret < 0) | |
221 | return ret; | |
222 | do { | |
223 | if (++tries > BLOCK_DATA_MAX_TRIES) { | |
224 | dev_err(&client->dev, | |
225 | "ds1307_read_block_data failed\n"); | |
226 | return -EIO; | |
227 | } | |
228 | memcpy(oldvalues, values, length); | |
229 | ret = ds1307_read_block_data_once(client, command, length, | |
230 | values); | |
231 | if (ret < 0) | |
232 | return ret; | |
233 | } while (memcmp(oldvalues, values, length)); | |
234 | return length; | |
235 | } | |
236 | ||
0cc43a18 | 237 | static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command, |
30e7b039 ES |
238 | u8 length, const u8 *values) |
239 | { | |
bc48b902 | 240 | u8 currvalues[255]; |
30e7b039 ES |
241 | int tries = 0; |
242 | ||
243 | dev_dbg(&client->dev, "ds1307_write_block_data (length=%d)\n", length); | |
244 | do { | |
245 | s32 i, ret; | |
246 | ||
247 | if (++tries > BLOCK_DATA_MAX_TRIES) { | |
248 | dev_err(&client->dev, | |
249 | "ds1307_write_block_data failed\n"); | |
250 | return -EIO; | |
251 | } | |
252 | for (i = 0; i < length; i++) { | |
253 | ret = i2c_smbus_write_byte_data(client, command + i, | |
254 | values[i]); | |
255 | if (ret < 0) | |
256 | return ret; | |
257 | } | |
258 | ret = ds1307_read_block_data_once(client, command, length, | |
259 | currvalues); | |
260 | if (ret < 0) | |
261 | return ret; | |
262 | } while (memcmp(currvalues, values, length)); | |
263 | return length; | |
264 | } | |
265 | ||
266 | /*----------------------------------------------------------------------*/ | |
267 | ||
bc48b902 BA |
268 | /* These RTC devices are not designed to be connected to a SMbus adapter. |
269 | SMbus limits block operations length to 32 bytes, whereas it's not | |
270 | limited on I2C buses. As a result, accesses may exceed 32 bytes; | |
271 | in that case, split them into smaller blocks */ | |
272 | ||
273 | static s32 ds1307_native_smbus_write_block_data(const struct i2c_client *client, | |
274 | u8 command, u8 length, const u8 *values) | |
275 | { | |
276 | u8 suboffset = 0; | |
277 | ||
1d87951c NB |
278 | if (length <= I2C_SMBUS_BLOCK_MAX) { |
279 | s32 retval = i2c_smbus_write_i2c_block_data(client, | |
bc48b902 | 280 | command, length, values); |
1d87951c NB |
281 | if (retval < 0) |
282 | return retval; | |
283 | return length; | |
284 | } | |
bc48b902 BA |
285 | |
286 | while (suboffset < length) { | |
287 | s32 retval = i2c_smbus_write_i2c_block_data(client, | |
288 | command + suboffset, | |
289 | min(I2C_SMBUS_BLOCK_MAX, length - suboffset), | |
290 | values + suboffset); | |
291 | if (retval < 0) | |
292 | return retval; | |
293 | ||
294 | suboffset += I2C_SMBUS_BLOCK_MAX; | |
295 | } | |
296 | return length; | |
297 | } | |
298 | ||
299 | static s32 ds1307_native_smbus_read_block_data(const struct i2c_client *client, | |
300 | u8 command, u8 length, u8 *values) | |
301 | { | |
302 | u8 suboffset = 0; | |
303 | ||
304 | if (length <= I2C_SMBUS_BLOCK_MAX) | |
305 | return i2c_smbus_read_i2c_block_data(client, | |
306 | command, length, values); | |
307 | ||
308 | while (suboffset < length) { | |
309 | s32 retval = i2c_smbus_read_i2c_block_data(client, | |
310 | command + suboffset, | |
311 | min(I2C_SMBUS_BLOCK_MAX, length - suboffset), | |
312 | values + suboffset); | |
313 | if (retval < 0) | |
314 | return retval; | |
315 | ||
316 | suboffset += I2C_SMBUS_BLOCK_MAX; | |
317 | } | |
318 | return length; | |
319 | } | |
320 | ||
321 | /*----------------------------------------------------------------------*/ | |
322 | ||
cb49a5e9 | 323 | /* |
cb49a5e9 RG |
324 | * The ds1337 and ds1339 both have two alarms, but we only use the first |
325 | * one (with a "seconds" field). For ds1337 we expect nINTA is our alarm | |
326 | * signal; ds1339 chips have only one alarm signal. | |
327 | */ | |
2fb07a10 | 328 | static irqreturn_t ds1307_irq(int irq, void *dev_id) |
cb49a5e9 | 329 | { |
2fb07a10 FB |
330 | struct i2c_client *client = dev_id; |
331 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
332 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
cb49a5e9 RG |
333 | int stat, control; |
334 | ||
cb49a5e9 RG |
335 | mutex_lock(lock); |
336 | stat = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS); | |
337 | if (stat < 0) | |
338 | goto out; | |
339 | ||
340 | if (stat & DS1337_BIT_A1I) { | |
341 | stat &= ~DS1337_BIT_A1I; | |
342 | i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, stat); | |
343 | ||
344 | control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); | |
345 | if (control < 0) | |
346 | goto out; | |
347 | ||
348 | control &= ~DS1337_BIT_A1IE; | |
349 | i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control); | |
350 | ||
cb49a5e9 | 351 | rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); |
cb49a5e9 RG |
352 | } |
353 | ||
354 | out: | |
cb49a5e9 | 355 | mutex_unlock(lock); |
cb49a5e9 | 356 | |
cb49a5e9 RG |
357 | return IRQ_HANDLED; |
358 | } | |
359 | ||
360 | /*----------------------------------------------------------------------*/ | |
361 | ||
1abb0dc9 DB |
362 | static int ds1307_get_time(struct device *dev, struct rtc_time *t) |
363 | { | |
364 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
365 | int tmp; | |
366 | ||
045e0e85 | 367 | /* read the RTC date and time registers all at once */ |
30e7b039 | 368 | tmp = ds1307->read_block_data(ds1307->client, |
33df2ee1 | 369 | ds1307->offset, 7, ds1307->regs); |
fed40b73 | 370 | if (tmp != 7) { |
1abb0dc9 DB |
371 | dev_err(dev, "%s error %d\n", "read", tmp); |
372 | return -EIO; | |
373 | } | |
374 | ||
01a4ca16 | 375 | dev_dbg(dev, "%s: %7ph\n", "read", ds1307->regs); |
1abb0dc9 | 376 | |
fe20ba70 AB |
377 | t->tm_sec = bcd2bin(ds1307->regs[DS1307_REG_SECS] & 0x7f); |
378 | t->tm_min = bcd2bin(ds1307->regs[DS1307_REG_MIN] & 0x7f); | |
1abb0dc9 | 379 | tmp = ds1307->regs[DS1307_REG_HOUR] & 0x3f; |
fe20ba70 AB |
380 | t->tm_hour = bcd2bin(tmp); |
381 | t->tm_wday = bcd2bin(ds1307->regs[DS1307_REG_WDAY] & 0x07) - 1; | |
382 | t->tm_mday = bcd2bin(ds1307->regs[DS1307_REG_MDAY] & 0x3f); | |
1abb0dc9 | 383 | tmp = ds1307->regs[DS1307_REG_MONTH] & 0x1f; |
fe20ba70 | 384 | t->tm_mon = bcd2bin(tmp) - 1; |
1abb0dc9 DB |
385 | |
386 | /* assume 20YY not 19YY, and ignore DS1337_BIT_CENTURY */ | |
fe20ba70 | 387 | t->tm_year = bcd2bin(ds1307->regs[DS1307_REG_YEAR]) + 100; |
1abb0dc9 DB |
388 | |
389 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
390 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", | |
391 | "read", t->tm_sec, t->tm_min, | |
392 | t->tm_hour, t->tm_mday, | |
393 | t->tm_mon, t->tm_year, t->tm_wday); | |
394 | ||
045e0e85 DB |
395 | /* initial clock setting can be undefined */ |
396 | return rtc_valid_tm(t); | |
1abb0dc9 DB |
397 | } |
398 | ||
399 | static int ds1307_set_time(struct device *dev, struct rtc_time *t) | |
400 | { | |
401 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
402 | int result; | |
403 | int tmp; | |
404 | u8 *buf = ds1307->regs; | |
405 | ||
406 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
407 | "hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", | |
11966adc JG |
408 | "write", t->tm_sec, t->tm_min, |
409 | t->tm_hour, t->tm_mday, | |
410 | t->tm_mon, t->tm_year, t->tm_wday); | |
1abb0dc9 | 411 | |
fe20ba70 AB |
412 | buf[DS1307_REG_SECS] = bin2bcd(t->tm_sec); |
413 | buf[DS1307_REG_MIN] = bin2bcd(t->tm_min); | |
414 | buf[DS1307_REG_HOUR] = bin2bcd(t->tm_hour); | |
415 | buf[DS1307_REG_WDAY] = bin2bcd(t->tm_wday + 1); | |
416 | buf[DS1307_REG_MDAY] = bin2bcd(t->tm_mday); | |
417 | buf[DS1307_REG_MONTH] = bin2bcd(t->tm_mon + 1); | |
1abb0dc9 DB |
418 | |
419 | /* assume 20YY not 19YY */ | |
420 | tmp = t->tm_year - 100; | |
fe20ba70 | 421 | buf[DS1307_REG_YEAR] = bin2bcd(tmp); |
1abb0dc9 | 422 | |
be5f59f4 RG |
423 | switch (ds1307->type) { |
424 | case ds_1337: | |
425 | case ds_1339: | |
97f902b7 | 426 | case ds_3231: |
1abb0dc9 | 427 | buf[DS1307_REG_MONTH] |= DS1337_BIT_CENTURY; |
be5f59f4 RG |
428 | break; |
429 | case ds_1340: | |
1abb0dc9 DB |
430 | buf[DS1307_REG_HOUR] |= DS1340_BIT_CENTURY_EN |
431 | | DS1340_BIT_CENTURY; | |
be5f59f4 | 432 | break; |
f4199f85 | 433 | case mcp794xx: |
40ce972d DA |
434 | /* |
435 | * these bits were cleared when preparing the date/time | |
436 | * values and need to be set again before writing the | |
437 | * buffer out to the device. | |
438 | */ | |
f4199f85 TN |
439 | buf[DS1307_REG_SECS] |= MCP794XX_BIT_ST; |
440 | buf[DS1307_REG_WDAY] |= MCP794XX_BIT_VBATEN; | |
43fcb815 | 441 | break; |
be5f59f4 RG |
442 | default: |
443 | break; | |
444 | } | |
1abb0dc9 | 445 | |
01a4ca16 | 446 | dev_dbg(dev, "%s: %7ph\n", "write", buf); |
1abb0dc9 | 447 | |
33df2ee1 JT |
448 | result = ds1307->write_block_data(ds1307->client, |
449 | ds1307->offset, 7, buf); | |
fed40b73 BS |
450 | if (result < 0) { |
451 | dev_err(dev, "%s error %d\n", "write", result); | |
452 | return result; | |
1abb0dc9 DB |
453 | } |
454 | return 0; | |
455 | } | |
456 | ||
74d88eb2 | 457 | static int ds1337_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
cb49a5e9 RG |
458 | { |
459 | struct i2c_client *client = to_i2c_client(dev); | |
460 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
461 | int ret; | |
462 | ||
463 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
464 | return -EINVAL; | |
465 | ||
466 | /* read all ALARM1, ALARM2, and status registers at once */ | |
30e7b039 | 467 | ret = ds1307->read_block_data(client, |
fed40b73 BS |
468 | DS1339_REG_ALARM1_SECS, 9, ds1307->regs); |
469 | if (ret != 9) { | |
cb49a5e9 RG |
470 | dev_err(dev, "%s error %d\n", "alarm read", ret); |
471 | return -EIO; | |
472 | } | |
473 | ||
ff67abd2 RV |
474 | dev_dbg(dev, "%s: %4ph, %3ph, %2ph\n", "alarm read", |
475 | &ds1307->regs[0], &ds1307->regs[4], &ds1307->regs[7]); | |
cb49a5e9 | 476 | |
40ce972d DA |
477 | /* |
478 | * report alarm time (ALARM1); assume 24 hour and day-of-month modes, | |
cb49a5e9 RG |
479 | * and that all four fields are checked matches |
480 | */ | |
481 | t->time.tm_sec = bcd2bin(ds1307->regs[0] & 0x7f); | |
482 | t->time.tm_min = bcd2bin(ds1307->regs[1] & 0x7f); | |
483 | t->time.tm_hour = bcd2bin(ds1307->regs[2] & 0x3f); | |
484 | t->time.tm_mday = bcd2bin(ds1307->regs[3] & 0x3f); | |
485 | t->time.tm_mon = -1; | |
486 | t->time.tm_year = -1; | |
487 | t->time.tm_wday = -1; | |
488 | t->time.tm_yday = -1; | |
489 | t->time.tm_isdst = -1; | |
490 | ||
491 | /* ... and status */ | |
492 | t->enabled = !!(ds1307->regs[7] & DS1337_BIT_A1IE); | |
493 | t->pending = !!(ds1307->regs[8] & DS1337_BIT_A1I); | |
494 | ||
495 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
496 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", | |
497 | "alarm read", t->time.tm_sec, t->time.tm_min, | |
498 | t->time.tm_hour, t->time.tm_mday, | |
499 | t->enabled, t->pending); | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
74d88eb2 | 504 | static int ds1337_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
cb49a5e9 | 505 | { |
40ce972d | 506 | struct i2c_client *client = to_i2c_client(dev); |
cb49a5e9 RG |
507 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
508 | unsigned char *buf = ds1307->regs; | |
509 | u8 control, status; | |
510 | int ret; | |
511 | ||
512 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
513 | return -EINVAL; | |
514 | ||
515 | dev_dbg(dev, "%s secs=%d, mins=%d, " | |
516 | "hours=%d, mday=%d, enabled=%d, pending=%d\n", | |
517 | "alarm set", t->time.tm_sec, t->time.tm_min, | |
518 | t->time.tm_hour, t->time.tm_mday, | |
519 | t->enabled, t->pending); | |
520 | ||
521 | /* read current status of both alarms and the chip */ | |
30e7b039 | 522 | ret = ds1307->read_block_data(client, |
fed40b73 BS |
523 | DS1339_REG_ALARM1_SECS, 9, buf); |
524 | if (ret != 9) { | |
cb49a5e9 RG |
525 | dev_err(dev, "%s error %d\n", "alarm write", ret); |
526 | return -EIO; | |
527 | } | |
528 | control = ds1307->regs[7]; | |
529 | status = ds1307->regs[8]; | |
530 | ||
ff67abd2 RV |
531 | dev_dbg(dev, "%s: %4ph, %3ph, %02x %02x\n", "alarm set (old status)", |
532 | &ds1307->regs[0], &ds1307->regs[4], control, status); | |
cb49a5e9 RG |
533 | |
534 | /* set ALARM1, using 24 hour and day-of-month modes */ | |
cb49a5e9 RG |
535 | buf[0] = bin2bcd(t->time.tm_sec); |
536 | buf[1] = bin2bcd(t->time.tm_min); | |
537 | buf[2] = bin2bcd(t->time.tm_hour); | |
538 | buf[3] = bin2bcd(t->time.tm_mday); | |
539 | ||
540 | /* set ALARM2 to non-garbage */ | |
541 | buf[4] = 0; | |
542 | buf[5] = 0; | |
543 | buf[6] = 0; | |
544 | ||
5919fb97 | 545 | /* disable alarms */ |
cb49a5e9 | 546 | buf[7] = control & ~(DS1337_BIT_A1IE | DS1337_BIT_A2IE); |
cb49a5e9 RG |
547 | buf[8] = status & ~(DS1337_BIT_A1I | DS1337_BIT_A2I); |
548 | ||
30e7b039 | 549 | ret = ds1307->write_block_data(client, |
fed40b73 BS |
550 | DS1339_REG_ALARM1_SECS, 9, buf); |
551 | if (ret < 0) { | |
cb49a5e9 | 552 | dev_err(dev, "can't set alarm time\n"); |
fed40b73 | 553 | return ret; |
cb49a5e9 RG |
554 | } |
555 | ||
5919fb97 NB |
556 | /* optionally enable ALARM1 */ |
557 | if (t->enabled) { | |
558 | dev_dbg(dev, "alarm IRQ armed\n"); | |
559 | buf[7] |= DS1337_BIT_A1IE; /* only ALARM1 is used */ | |
560 | i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, buf[7]); | |
561 | } | |
562 | ||
cb49a5e9 RG |
563 | return 0; |
564 | } | |
565 | ||
16380c15 | 566 | static int ds1307_alarm_irq_enable(struct device *dev, unsigned int enabled) |
cb49a5e9 RG |
567 | { |
568 | struct i2c_client *client = to_i2c_client(dev); | |
569 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
570 | int ret; | |
571 | ||
16380c15 JS |
572 | if (!test_bit(HAS_ALARM, &ds1307->flags)) |
573 | return -ENOTTY; | |
cb49a5e9 | 574 | |
16380c15 JS |
575 | ret = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); |
576 | if (ret < 0) | |
577 | return ret; | |
cb49a5e9 | 578 | |
16380c15 | 579 | if (enabled) |
cb49a5e9 | 580 | ret |= DS1337_BIT_A1IE; |
16380c15 JS |
581 | else |
582 | ret &= ~DS1337_BIT_A1IE; | |
cb49a5e9 | 583 | |
16380c15 JS |
584 | ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, ret); |
585 | if (ret < 0) | |
586 | return ret; | |
cb49a5e9 RG |
587 | |
588 | return 0; | |
589 | } | |
590 | ||
ff8371ac | 591 | static const struct rtc_class_ops ds13xx_rtc_ops = { |
1abb0dc9 DB |
592 | .read_time = ds1307_get_time, |
593 | .set_time = ds1307_set_time, | |
74d88eb2 JR |
594 | .read_alarm = ds1337_read_alarm, |
595 | .set_alarm = ds1337_set_alarm, | |
16380c15 | 596 | .alarm_irq_enable = ds1307_alarm_irq_enable, |
1abb0dc9 DB |
597 | }; |
598 | ||
682d73f6 DB |
599 | /*----------------------------------------------------------------------*/ |
600 | ||
1d1945d2 | 601 | /* |
f4199f85 | 602 | * Alarm support for mcp794xx devices. |
1d1945d2 SG |
603 | */ |
604 | ||
f4199f85 TN |
605 | #define MCP794XX_REG_CONTROL 0x07 |
606 | # define MCP794XX_BIT_ALM0_EN 0x10 | |
607 | # define MCP794XX_BIT_ALM1_EN 0x20 | |
608 | #define MCP794XX_REG_ALARM0_BASE 0x0a | |
609 | #define MCP794XX_REG_ALARM0_CTRL 0x0d | |
610 | #define MCP794XX_REG_ALARM1_BASE 0x11 | |
611 | #define MCP794XX_REG_ALARM1_CTRL 0x14 | |
612 | # define MCP794XX_BIT_ALMX_IF (1 << 3) | |
613 | # define MCP794XX_BIT_ALMX_C0 (1 << 4) | |
614 | # define MCP794XX_BIT_ALMX_C1 (1 << 5) | |
615 | # define MCP794XX_BIT_ALMX_C2 (1 << 6) | |
616 | # define MCP794XX_BIT_ALMX_POL (1 << 7) | |
617 | # define MCP794XX_MSK_ALMX_MATCH (MCP794XX_BIT_ALMX_C0 | \ | |
618 | MCP794XX_BIT_ALMX_C1 | \ | |
619 | MCP794XX_BIT_ALMX_C2) | |
620 | ||
2fb07a10 | 621 | static irqreturn_t mcp794xx_irq(int irq, void *dev_id) |
1d1945d2 | 622 | { |
2fb07a10 FB |
623 | struct i2c_client *client = dev_id; |
624 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
625 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
1d1945d2 SG |
626 | int reg, ret; |
627 | ||
2fb07a10 | 628 | mutex_lock(lock); |
1d1945d2 SG |
629 | |
630 | /* Check and clear alarm 0 interrupt flag. */ | |
f4199f85 | 631 | reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_ALARM0_CTRL); |
1d1945d2 SG |
632 | if (reg < 0) |
633 | goto out; | |
f4199f85 | 634 | if (!(reg & MCP794XX_BIT_ALMX_IF)) |
1d1945d2 | 635 | goto out; |
f4199f85 TN |
636 | reg &= ~MCP794XX_BIT_ALMX_IF; |
637 | ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_ALARM0_CTRL, reg); | |
1d1945d2 SG |
638 | if (ret < 0) |
639 | goto out; | |
640 | ||
641 | /* Disable alarm 0. */ | |
f4199f85 | 642 | reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL); |
1d1945d2 SG |
643 | if (reg < 0) |
644 | goto out; | |
f4199f85 TN |
645 | reg &= ~MCP794XX_BIT_ALM0_EN; |
646 | ret = i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg); | |
1d1945d2 SG |
647 | if (ret < 0) |
648 | goto out; | |
649 | ||
650 | rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF); | |
651 | ||
652 | out: | |
2fb07a10 FB |
653 | mutex_unlock(lock); |
654 | ||
655 | return IRQ_HANDLED; | |
1d1945d2 SG |
656 | } |
657 | ||
f4199f85 | 658 | static int mcp794xx_read_alarm(struct device *dev, struct rtc_wkalrm *t) |
1d1945d2 SG |
659 | { |
660 | struct i2c_client *client = to_i2c_client(dev); | |
661 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
662 | u8 *regs = ds1307->regs; | |
663 | int ret; | |
664 | ||
665 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
666 | return -EINVAL; | |
667 | ||
668 | /* Read control and alarm 0 registers. */ | |
f4199f85 | 669 | ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs); |
1d1945d2 SG |
670 | if (ret < 0) |
671 | return ret; | |
672 | ||
f4199f85 | 673 | t->enabled = !!(regs[0] & MCP794XX_BIT_ALM0_EN); |
1d1945d2 SG |
674 | |
675 | /* Report alarm 0 time assuming 24-hour and day-of-month modes. */ | |
676 | t->time.tm_sec = bcd2bin(ds1307->regs[3] & 0x7f); | |
677 | t->time.tm_min = bcd2bin(ds1307->regs[4] & 0x7f); | |
678 | t->time.tm_hour = bcd2bin(ds1307->regs[5] & 0x3f); | |
679 | t->time.tm_wday = bcd2bin(ds1307->regs[6] & 0x7) - 1; | |
680 | t->time.tm_mday = bcd2bin(ds1307->regs[7] & 0x3f); | |
681 | t->time.tm_mon = bcd2bin(ds1307->regs[8] & 0x1f) - 1; | |
682 | t->time.tm_year = -1; | |
683 | t->time.tm_yday = -1; | |
684 | t->time.tm_isdst = -1; | |
685 | ||
686 | dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d " | |
687 | "enabled=%d polarity=%d irq=%d match=%d\n", __func__, | |
688 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
689 | t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled, | |
f4199f85 TN |
690 | !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_POL), |
691 | !!(ds1307->regs[6] & MCP794XX_BIT_ALMX_IF), | |
692 | (ds1307->regs[6] & MCP794XX_MSK_ALMX_MATCH) >> 4); | |
1d1945d2 SG |
693 | |
694 | return 0; | |
695 | } | |
696 | ||
f4199f85 | 697 | static int mcp794xx_set_alarm(struct device *dev, struct rtc_wkalrm *t) |
1d1945d2 SG |
698 | { |
699 | struct i2c_client *client = to_i2c_client(dev); | |
700 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
701 | unsigned char *regs = ds1307->regs; | |
702 | int ret; | |
703 | ||
704 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
705 | return -EINVAL; | |
706 | ||
707 | dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d " | |
708 | "enabled=%d pending=%d\n", __func__, | |
709 | t->time.tm_sec, t->time.tm_min, t->time.tm_hour, | |
710 | t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, | |
711 | t->enabled, t->pending); | |
712 | ||
713 | /* Read control and alarm 0 registers. */ | |
f4199f85 | 714 | ret = ds1307->read_block_data(client, MCP794XX_REG_CONTROL, 10, regs); |
1d1945d2 SG |
715 | if (ret < 0) |
716 | return ret; | |
717 | ||
718 | /* Set alarm 0, using 24-hour and day-of-month modes. */ | |
719 | regs[3] = bin2bcd(t->time.tm_sec); | |
720 | regs[4] = bin2bcd(t->time.tm_min); | |
721 | regs[5] = bin2bcd(t->time.tm_hour); | |
62c8c20a | 722 | regs[6] = bin2bcd(t->time.tm_wday + 1); |
1d1945d2 | 723 | regs[7] = bin2bcd(t->time.tm_mday); |
62c8c20a | 724 | regs[8] = bin2bcd(t->time.tm_mon + 1); |
1d1945d2 SG |
725 | |
726 | /* Clear the alarm 0 interrupt flag. */ | |
f4199f85 | 727 | regs[6] &= ~MCP794XX_BIT_ALMX_IF; |
1d1945d2 | 728 | /* Set alarm match: second, minute, hour, day, date, month. */ |
f4199f85 | 729 | regs[6] |= MCP794XX_MSK_ALMX_MATCH; |
e3edd671 NM |
730 | /* Disable interrupt. We will not enable until completely programmed */ |
731 | regs[0] &= ~MCP794XX_BIT_ALM0_EN; | |
1d1945d2 | 732 | |
f4199f85 | 733 | ret = ds1307->write_block_data(client, MCP794XX_REG_CONTROL, 10, regs); |
1d1945d2 SG |
734 | if (ret < 0) |
735 | return ret; | |
736 | ||
e3edd671 NM |
737 | if (!t->enabled) |
738 | return 0; | |
739 | regs[0] |= MCP794XX_BIT_ALM0_EN; | |
740 | return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, regs[0]); | |
1d1945d2 SG |
741 | } |
742 | ||
f4199f85 | 743 | static int mcp794xx_alarm_irq_enable(struct device *dev, unsigned int enabled) |
1d1945d2 SG |
744 | { |
745 | struct i2c_client *client = to_i2c_client(dev); | |
746 | struct ds1307 *ds1307 = i2c_get_clientdata(client); | |
747 | int reg; | |
748 | ||
749 | if (!test_bit(HAS_ALARM, &ds1307->flags)) | |
750 | return -EINVAL; | |
751 | ||
f4199f85 | 752 | reg = i2c_smbus_read_byte_data(client, MCP794XX_REG_CONTROL); |
1d1945d2 SG |
753 | if (reg < 0) |
754 | return reg; | |
755 | ||
756 | if (enabled) | |
f4199f85 | 757 | reg |= MCP794XX_BIT_ALM0_EN; |
1d1945d2 | 758 | else |
f4199f85 | 759 | reg &= ~MCP794XX_BIT_ALM0_EN; |
1d1945d2 | 760 | |
f4199f85 | 761 | return i2c_smbus_write_byte_data(client, MCP794XX_REG_CONTROL, reg); |
1d1945d2 SG |
762 | } |
763 | ||
f4199f85 | 764 | static const struct rtc_class_ops mcp794xx_rtc_ops = { |
1d1945d2 SG |
765 | .read_time = ds1307_get_time, |
766 | .set_time = ds1307_set_time, | |
f4199f85 TN |
767 | .read_alarm = mcp794xx_read_alarm, |
768 | .set_alarm = mcp794xx_set_alarm, | |
769 | .alarm_irq_enable = mcp794xx_alarm_irq_enable, | |
1d1945d2 SG |
770 | }; |
771 | ||
772 | /*----------------------------------------------------------------------*/ | |
773 | ||
682d73f6 | 774 | static ssize_t |
2c3c8bea CW |
775 | ds1307_nvram_read(struct file *filp, struct kobject *kobj, |
776 | struct bin_attribute *attr, | |
682d73f6 DB |
777 | char *buf, loff_t off, size_t count) |
778 | { | |
779 | struct i2c_client *client; | |
780 | struct ds1307 *ds1307; | |
682d73f6 DB |
781 | int result; |
782 | ||
fcd8db00 | 783 | client = kobj_to_i2c_client(kobj); |
682d73f6 DB |
784 | ds1307 = i2c_get_clientdata(client); |
785 | ||
9eab0a78 AB |
786 | result = ds1307->read_block_data(client, ds1307->nvram_offset + off, |
787 | count, buf); | |
fed40b73 | 788 | if (result < 0) |
682d73f6 | 789 | dev_err(&client->dev, "%s error %d\n", "nvram read", result); |
fed40b73 | 790 | return result; |
682d73f6 DB |
791 | } |
792 | ||
793 | static ssize_t | |
2c3c8bea CW |
794 | ds1307_nvram_write(struct file *filp, struct kobject *kobj, |
795 | struct bin_attribute *attr, | |
682d73f6 DB |
796 | char *buf, loff_t off, size_t count) |
797 | { | |
798 | struct i2c_client *client; | |
30e7b039 | 799 | struct ds1307 *ds1307; |
fed40b73 | 800 | int result; |
682d73f6 | 801 | |
fcd8db00 | 802 | client = kobj_to_i2c_client(kobj); |
30e7b039 | 803 | ds1307 = i2c_get_clientdata(client); |
682d73f6 | 804 | |
9eab0a78 AB |
805 | result = ds1307->write_block_data(client, ds1307->nvram_offset + off, |
806 | count, buf); | |
fed40b73 BS |
807 | if (result < 0) { |
808 | dev_err(&client->dev, "%s error %d\n", "nvram write", result); | |
809 | return result; | |
810 | } | |
811 | return count; | |
682d73f6 DB |
812 | } |
813 | ||
33b04b7b | 814 | |
682d73f6 DB |
815 | /*----------------------------------------------------------------------*/ |
816 | ||
33b04b7b MV |
817 | static u8 do_trickle_setup_ds1339(struct i2c_client *client, |
818 | uint32_t ohms, bool diode) | |
819 | { | |
820 | u8 setup = (diode) ? DS1307_TRICKLE_CHARGER_DIODE : | |
821 | DS1307_TRICKLE_CHARGER_NO_DIODE; | |
822 | ||
823 | switch (ohms) { | |
824 | case 250: | |
825 | setup |= DS1307_TRICKLE_CHARGER_250_OHM; | |
826 | break; | |
827 | case 2000: | |
828 | setup |= DS1307_TRICKLE_CHARGER_2K_OHM; | |
829 | break; | |
830 | case 4000: | |
831 | setup |= DS1307_TRICKLE_CHARGER_4K_OHM; | |
832 | break; | |
833 | default: | |
834 | dev_warn(&client->dev, | |
835 | "Unsupported ohm value %u in dt\n", ohms); | |
836 | return 0; | |
837 | } | |
838 | return setup; | |
839 | } | |
840 | ||
841 | static void ds1307_trickle_of_init(struct i2c_client *client, | |
842 | struct chip_desc *chip) | |
843 | { | |
844 | uint32_t ohms = 0; | |
845 | bool diode = true; | |
846 | ||
847 | if (!chip->do_trickle_setup) | |
848 | goto out; | |
849 | if (of_property_read_u32(client->dev.of_node, "trickle-resistor-ohms" , &ohms)) | |
850 | goto out; | |
851 | if (of_property_read_bool(client->dev.of_node, "trickle-diode-disable")) | |
852 | diode = false; | |
853 | chip->trickle_charger_setup = chip->do_trickle_setup(client, | |
854 | ohms, diode); | |
855 | out: | |
856 | return; | |
857 | } | |
858 | ||
445c0207 AM |
859 | /*----------------------------------------------------------------------*/ |
860 | ||
861 | #ifdef CONFIG_RTC_DRV_DS1307_HWMON | |
862 | ||
863 | /* | |
864 | * Temperature sensor support for ds3231 devices. | |
865 | */ | |
866 | ||
867 | #define DS3231_REG_TEMPERATURE 0x11 | |
868 | ||
869 | /* | |
870 | * A user-initiated temperature conversion is not started by this function, | |
871 | * so the temperature is updated once every 64 seconds. | |
872 | */ | |
9a3dce62 | 873 | static int ds3231_hwmon_read_temp(struct device *dev, s32 *mC) |
445c0207 AM |
874 | { |
875 | struct ds1307 *ds1307 = dev_get_drvdata(dev); | |
876 | u8 temp_buf[2]; | |
877 | s16 temp; | |
878 | int ret; | |
879 | ||
880 | ret = ds1307->read_block_data(ds1307->client, DS3231_REG_TEMPERATURE, | |
881 | sizeof(temp_buf), temp_buf); | |
882 | if (ret < 0) | |
883 | return ret; | |
884 | if (ret != sizeof(temp_buf)) | |
885 | return -EIO; | |
886 | ||
887 | /* | |
888 | * Temperature is represented as a 10-bit code with a resolution of | |
889 | * 0.25 degree celsius and encoded in two's complement format. | |
890 | */ | |
891 | temp = (temp_buf[0] << 8) | temp_buf[1]; | |
892 | temp >>= 6; | |
893 | *mC = temp * 250; | |
894 | ||
895 | return 0; | |
896 | } | |
897 | ||
898 | static ssize_t ds3231_hwmon_show_temp(struct device *dev, | |
899 | struct device_attribute *attr, char *buf) | |
900 | { | |
901 | int ret; | |
9a3dce62 | 902 | s32 temp; |
445c0207 AM |
903 | |
904 | ret = ds3231_hwmon_read_temp(dev, &temp); | |
905 | if (ret) | |
906 | return ret; | |
907 | ||
908 | return sprintf(buf, "%d\n", temp); | |
909 | } | |
910 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, ds3231_hwmon_show_temp, | |
911 | NULL, 0); | |
912 | ||
913 | static struct attribute *ds3231_hwmon_attrs[] = { | |
914 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
915 | NULL, | |
916 | }; | |
917 | ATTRIBUTE_GROUPS(ds3231_hwmon); | |
918 | ||
919 | static void ds1307_hwmon_register(struct ds1307 *ds1307) | |
920 | { | |
921 | struct device *dev; | |
922 | ||
923 | if (ds1307->type != ds_3231) | |
924 | return; | |
925 | ||
926 | dev = devm_hwmon_device_register_with_groups(&ds1307->client->dev, | |
927 | ds1307->client->name, | |
928 | ds1307, ds3231_hwmon_groups); | |
929 | if (IS_ERR(dev)) { | |
930 | dev_warn(&ds1307->client->dev, | |
931 | "unable to register hwmon device %ld\n", PTR_ERR(dev)); | |
932 | } | |
933 | } | |
934 | ||
935 | #else | |
936 | ||
937 | static void ds1307_hwmon_register(struct ds1307 *ds1307) | |
938 | { | |
939 | } | |
940 | ||
6c6ff145 AM |
941 | #endif /* CONFIG_RTC_DRV_DS1307_HWMON */ |
942 | ||
943 | /*----------------------------------------------------------------------*/ | |
944 | ||
945 | /* | |
946 | * Square-wave output support for DS3231 | |
947 | * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS3231.pdf | |
948 | */ | |
949 | #ifdef CONFIG_COMMON_CLK | |
950 | ||
951 | enum { | |
952 | DS3231_CLK_SQW = 0, | |
953 | DS3231_CLK_32KHZ, | |
954 | }; | |
955 | ||
956 | #define clk_sqw_to_ds1307(clk) \ | |
957 | container_of(clk, struct ds1307, clks[DS3231_CLK_SQW]) | |
958 | #define clk_32khz_to_ds1307(clk) \ | |
959 | container_of(clk, struct ds1307, clks[DS3231_CLK_32KHZ]) | |
960 | ||
961 | static int ds3231_clk_sqw_rates[] = { | |
962 | 1, | |
963 | 1024, | |
964 | 4096, | |
965 | 8192, | |
966 | }; | |
967 | ||
968 | static int ds1337_write_control(struct ds1307 *ds1307, u8 mask, u8 value) | |
969 | { | |
970 | struct i2c_client *client = ds1307->client; | |
971 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
972 | int control; | |
973 | int ret; | |
974 | ||
975 | mutex_lock(lock); | |
976 | ||
977 | control = i2c_smbus_read_byte_data(client, DS1337_REG_CONTROL); | |
978 | if (control < 0) { | |
979 | ret = control; | |
980 | goto out; | |
981 | } | |
982 | ||
983 | control &= ~mask; | |
984 | control |= value; | |
985 | ||
986 | ret = i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control); | |
987 | out: | |
988 | mutex_unlock(lock); | |
989 | ||
990 | return ret; | |
991 | } | |
992 | ||
993 | static unsigned long ds3231_clk_sqw_recalc_rate(struct clk_hw *hw, | |
994 | unsigned long parent_rate) | |
995 | { | |
996 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
997 | int control; | |
998 | int rate_sel = 0; | |
999 | ||
1000 | control = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_CONTROL); | |
1001 | if (control < 0) | |
1002 | return control; | |
1003 | if (control & DS1337_BIT_RS1) | |
1004 | rate_sel += 1; | |
1005 | if (control & DS1337_BIT_RS2) | |
1006 | rate_sel += 2; | |
1007 | ||
1008 | return ds3231_clk_sqw_rates[rate_sel]; | |
1009 | } | |
1010 | ||
1011 | static long ds3231_clk_sqw_round_rate(struct clk_hw *hw, unsigned long rate, | |
1012 | unsigned long *prate) | |
1013 | { | |
1014 | int i; | |
1015 | ||
1016 | for (i = ARRAY_SIZE(ds3231_clk_sqw_rates) - 1; i >= 0; i--) { | |
1017 | if (ds3231_clk_sqw_rates[i] <= rate) | |
1018 | return ds3231_clk_sqw_rates[i]; | |
1019 | } | |
1020 | ||
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static int ds3231_clk_sqw_set_rate(struct clk_hw *hw, unsigned long rate, | |
1025 | unsigned long parent_rate) | |
1026 | { | |
1027 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1028 | int control = 0; | |
1029 | int rate_sel; | |
1030 | ||
1031 | for (rate_sel = 0; rate_sel < ARRAY_SIZE(ds3231_clk_sqw_rates); | |
1032 | rate_sel++) { | |
1033 | if (ds3231_clk_sqw_rates[rate_sel] == rate) | |
1034 | break; | |
1035 | } | |
1036 | ||
1037 | if (rate_sel == ARRAY_SIZE(ds3231_clk_sqw_rates)) | |
1038 | return -EINVAL; | |
1039 | ||
1040 | if (rate_sel & 1) | |
1041 | control |= DS1337_BIT_RS1; | |
1042 | if (rate_sel & 2) | |
1043 | control |= DS1337_BIT_RS2; | |
1044 | ||
1045 | return ds1337_write_control(ds1307, DS1337_BIT_RS1 | DS1337_BIT_RS2, | |
1046 | control); | |
1047 | } | |
1048 | ||
1049 | static int ds3231_clk_sqw_prepare(struct clk_hw *hw) | |
1050 | { | |
1051 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1052 | ||
1053 | return ds1337_write_control(ds1307, DS1337_BIT_INTCN, 0); | |
1054 | } | |
1055 | ||
1056 | static void ds3231_clk_sqw_unprepare(struct clk_hw *hw) | |
1057 | { | |
1058 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1059 | ||
1060 | ds1337_write_control(ds1307, DS1337_BIT_INTCN, DS1337_BIT_INTCN); | |
1061 | } | |
1062 | ||
1063 | static int ds3231_clk_sqw_is_prepared(struct clk_hw *hw) | |
1064 | { | |
1065 | struct ds1307 *ds1307 = clk_sqw_to_ds1307(hw); | |
1066 | int control; | |
1067 | ||
1068 | control = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_CONTROL); | |
1069 | if (control < 0) | |
1070 | return control; | |
1071 | ||
1072 | return !(control & DS1337_BIT_INTCN); | |
1073 | } | |
1074 | ||
1075 | static const struct clk_ops ds3231_clk_sqw_ops = { | |
1076 | .prepare = ds3231_clk_sqw_prepare, | |
1077 | .unprepare = ds3231_clk_sqw_unprepare, | |
1078 | .is_prepared = ds3231_clk_sqw_is_prepared, | |
1079 | .recalc_rate = ds3231_clk_sqw_recalc_rate, | |
1080 | .round_rate = ds3231_clk_sqw_round_rate, | |
1081 | .set_rate = ds3231_clk_sqw_set_rate, | |
1082 | }; | |
1083 | ||
1084 | static unsigned long ds3231_clk_32khz_recalc_rate(struct clk_hw *hw, | |
1085 | unsigned long parent_rate) | |
1086 | { | |
1087 | return 32768; | |
1088 | } | |
1089 | ||
1090 | static int ds3231_clk_32khz_control(struct ds1307 *ds1307, bool enable) | |
1091 | { | |
1092 | struct i2c_client *client = ds1307->client; | |
1093 | struct mutex *lock = &ds1307->rtc->ops_lock; | |
1094 | int status; | |
1095 | int ret; | |
1096 | ||
1097 | mutex_lock(lock); | |
1098 | ||
1099 | status = i2c_smbus_read_byte_data(client, DS1337_REG_STATUS); | |
1100 | if (status < 0) { | |
1101 | ret = status; | |
1102 | goto out; | |
1103 | } | |
1104 | ||
1105 | if (enable) | |
1106 | status |= DS3231_BIT_EN32KHZ; | |
1107 | else | |
1108 | status &= ~DS3231_BIT_EN32KHZ; | |
1109 | ||
1110 | ret = i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, status); | |
1111 | out: | |
1112 | mutex_unlock(lock); | |
1113 | ||
1114 | return ret; | |
1115 | } | |
1116 | ||
1117 | static int ds3231_clk_32khz_prepare(struct clk_hw *hw) | |
1118 | { | |
1119 | struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw); | |
1120 | ||
1121 | return ds3231_clk_32khz_control(ds1307, true); | |
1122 | } | |
1123 | ||
1124 | static void ds3231_clk_32khz_unprepare(struct clk_hw *hw) | |
1125 | { | |
1126 | struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw); | |
1127 | ||
1128 | ds3231_clk_32khz_control(ds1307, false); | |
1129 | } | |
1130 | ||
1131 | static int ds3231_clk_32khz_is_prepared(struct clk_hw *hw) | |
1132 | { | |
1133 | struct ds1307 *ds1307 = clk_32khz_to_ds1307(hw); | |
1134 | int status; | |
1135 | ||
1136 | status = i2c_smbus_read_byte_data(ds1307->client, DS1337_REG_STATUS); | |
1137 | if (status < 0) | |
1138 | return status; | |
1139 | ||
1140 | return !!(status & DS3231_BIT_EN32KHZ); | |
1141 | } | |
1142 | ||
1143 | static const struct clk_ops ds3231_clk_32khz_ops = { | |
1144 | .prepare = ds3231_clk_32khz_prepare, | |
1145 | .unprepare = ds3231_clk_32khz_unprepare, | |
1146 | .is_prepared = ds3231_clk_32khz_is_prepared, | |
1147 | .recalc_rate = ds3231_clk_32khz_recalc_rate, | |
1148 | }; | |
1149 | ||
1150 | static struct clk_init_data ds3231_clks_init[] = { | |
1151 | [DS3231_CLK_SQW] = { | |
1152 | .name = "ds3231_clk_sqw", | |
1153 | .ops = &ds3231_clk_sqw_ops, | |
6c6ff145 AM |
1154 | }, |
1155 | [DS3231_CLK_32KHZ] = { | |
1156 | .name = "ds3231_clk_32khz", | |
1157 | .ops = &ds3231_clk_32khz_ops, | |
6c6ff145 AM |
1158 | }, |
1159 | }; | |
1160 | ||
1161 | static int ds3231_clks_register(struct ds1307 *ds1307) | |
1162 | { | |
1163 | struct i2c_client *client = ds1307->client; | |
1164 | struct device_node *node = client->dev.of_node; | |
1165 | struct clk_onecell_data *onecell; | |
1166 | int i; | |
1167 | ||
1168 | onecell = devm_kzalloc(&client->dev, sizeof(*onecell), GFP_KERNEL); | |
1169 | if (!onecell) | |
1170 | return -ENOMEM; | |
1171 | ||
1172 | onecell->clk_num = ARRAY_SIZE(ds3231_clks_init); | |
1173 | onecell->clks = devm_kcalloc(&client->dev, onecell->clk_num, | |
1174 | sizeof(onecell->clks[0]), GFP_KERNEL); | |
1175 | if (!onecell->clks) | |
1176 | return -ENOMEM; | |
1177 | ||
1178 | for (i = 0; i < ARRAY_SIZE(ds3231_clks_init); i++) { | |
1179 | struct clk_init_data init = ds3231_clks_init[i]; | |
1180 | ||
1181 | /* | |
1182 | * Interrupt signal due to alarm conditions and square-wave | |
1183 | * output share same pin, so don't initialize both. | |
1184 | */ | |
1185 | if (i == DS3231_CLK_SQW && test_bit(HAS_ALARM, &ds1307->flags)) | |
1186 | continue; | |
1187 | ||
1188 | /* optional override of the clockname */ | |
1189 | of_property_read_string_index(node, "clock-output-names", i, | |
1190 | &init.name); | |
1191 | ds1307->clks[i].init = &init; | |
1192 | ||
1193 | onecell->clks[i] = devm_clk_register(&client->dev, | |
1194 | &ds1307->clks[i]); | |
1195 | if (IS_ERR(onecell->clks[i])) | |
1196 | return PTR_ERR(onecell->clks[i]); | |
1197 | } | |
1198 | ||
1199 | if (!node) | |
1200 | return 0; | |
1201 | ||
1202 | of_clk_add_provider(node, of_clk_src_onecell_get, onecell); | |
1203 | ||
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | static void ds1307_clks_register(struct ds1307 *ds1307) | |
1208 | { | |
1209 | int ret; | |
1210 | ||
1211 | if (ds1307->type != ds_3231) | |
1212 | return; | |
1213 | ||
1214 | ret = ds3231_clks_register(ds1307); | |
1215 | if (ret) { | |
1216 | dev_warn(&ds1307->client->dev, | |
1217 | "unable to register clock device %d\n", ret); | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | #else | |
1222 | ||
1223 | static void ds1307_clks_register(struct ds1307 *ds1307) | |
1224 | { | |
1225 | } | |
1226 | ||
1227 | #endif /* CONFIG_COMMON_CLK */ | |
445c0207 | 1228 | |
5a167f45 GKH |
1229 | static int ds1307_probe(struct i2c_client *client, |
1230 | const struct i2c_device_id *id) | |
1abb0dc9 DB |
1231 | { |
1232 | struct ds1307 *ds1307; | |
1233 | int err = -ENODEV; | |
1abb0dc9 | 1234 | int tmp; |
33b04b7b | 1235 | struct chip_desc *chip = &chips[id->driver_data]; |
c065f35c | 1236 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); |
c8b18da7 | 1237 | bool want_irq = false; |
8bc2a407 | 1238 | bool ds1307_can_wakeup_device = false; |
fed40b73 | 1239 | unsigned char *buf; |
01ce893d | 1240 | struct ds1307_platform_data *pdata = dev_get_platdata(&client->dev); |
2fb07a10 FB |
1241 | irq_handler_t irq_handler = ds1307_irq; |
1242 | ||
97f902b7 WS |
1243 | static const int bbsqi_bitpos[] = { |
1244 | [ds_1337] = 0, | |
1245 | [ds_1339] = DS1339_BIT_BBSQI, | |
1246 | [ds_3231] = DS3231_BIT_BBSQW, | |
1247 | }; | |
1d1945d2 | 1248 | const struct rtc_class_ops *rtc_ops = &ds13xx_rtc_ops; |
1abb0dc9 | 1249 | |
30e7b039 ES |
1250 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA) |
1251 | && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) | |
c065f35c DB |
1252 | return -EIO; |
1253 | ||
edca66d2 | 1254 | ds1307 = devm_kzalloc(&client->dev, sizeof(struct ds1307), GFP_KERNEL); |
40ce972d | 1255 | if (!ds1307) |
c065f35c | 1256 | return -ENOMEM; |
045e0e85 | 1257 | |
1abb0dc9 | 1258 | i2c_set_clientdata(client, ds1307); |
33df2ee1 JT |
1259 | |
1260 | ds1307->client = client; | |
1261 | ds1307->type = id->driver_data; | |
33df2ee1 | 1262 | |
33b04b7b MV |
1263 | if (!pdata && client->dev.of_node) |
1264 | ds1307_trickle_of_init(client, chip); | |
1265 | else if (pdata && pdata->trickle_charger_setup) | |
1266 | chip->trickle_charger_setup = pdata->trickle_charger_setup; | |
1267 | ||
1268 | if (chip->trickle_charger_setup && chip->trickle_charger_reg) { | |
1269 | dev_dbg(&client->dev, "writing trickle charger info 0x%x to 0x%x\n", | |
1270 | DS13XX_TRICKLE_CHARGER_MAGIC | chip->trickle_charger_setup, | |
1271 | chip->trickle_charger_reg); | |
eb86c306 | 1272 | i2c_smbus_write_byte_data(client, chip->trickle_charger_reg, |
33b04b7b MV |
1273 | DS13XX_TRICKLE_CHARGER_MAGIC | |
1274 | chip->trickle_charger_setup); | |
1275 | } | |
eb86c306 | 1276 | |
fed40b73 | 1277 | buf = ds1307->regs; |
30e7b039 | 1278 | if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) { |
bc48b902 BA |
1279 | ds1307->read_block_data = ds1307_native_smbus_read_block_data; |
1280 | ds1307->write_block_data = ds1307_native_smbus_write_block_data; | |
30e7b039 ES |
1281 | } else { |
1282 | ds1307->read_block_data = ds1307_read_block_data; | |
1283 | ds1307->write_block_data = ds1307_write_block_data; | |
1284 | } | |
045e0e85 | 1285 | |
8bc2a407 ML |
1286 | #ifdef CONFIG_OF |
1287 | /* | |
1288 | * For devices with no IRQ directly connected to the SoC, the RTC chip | |
1289 | * can be forced as a wakeup source by stating that explicitly in | |
1290 | * the device's .dts file using the "wakeup-source" boolean property. | |
1291 | * If the "wakeup-source" property is set, don't request an IRQ. | |
1292 | * This will guarantee the 'wakealarm' sysfs entry is available on the device, | |
1293 | * if supported by the RTC. | |
1294 | */ | |
1295 | if (of_property_read_bool(client->dev.of_node, "wakeup-source")) { | |
1296 | ds1307_can_wakeup_device = true; | |
1297 | } | |
1298 | #endif | |
1299 | ||
045e0e85 DB |
1300 | switch (ds1307->type) { |
1301 | case ds_1337: | |
1302 | case ds_1339: | |
97f902b7 | 1303 | case ds_3231: |
be5f59f4 | 1304 | /* get registers that the "rtc" read below won't read... */ |
30e7b039 | 1305 | tmp = ds1307->read_block_data(ds1307->client, |
fed40b73 | 1306 | DS1337_REG_CONTROL, 2, buf); |
1abb0dc9 | 1307 | if (tmp != 2) { |
6df80e21 | 1308 | dev_dbg(&client->dev, "read error %d\n", tmp); |
1abb0dc9 | 1309 | err = -EIO; |
edca66d2 | 1310 | goto exit; |
1abb0dc9 DB |
1311 | } |
1312 | ||
be5f59f4 RG |
1313 | /* oscillator off? turn it on, so clock can tick. */ |
1314 | if (ds1307->regs[0] & DS1337_BIT_nEOSC) | |
cb49a5e9 RG |
1315 | ds1307->regs[0] &= ~DS1337_BIT_nEOSC; |
1316 | ||
40ce972d | 1317 | /* |
8bc2a407 ML |
1318 | * Using IRQ or defined as wakeup-source? |
1319 | * Disable the square wave and both alarms. | |
97f902b7 WS |
1320 | * For some variants, be sure alarms can trigger when we're |
1321 | * running on Vbackup (BBSQI/BBSQW) | |
cb49a5e9 | 1322 | */ |
8bc2a407 ML |
1323 | if (chip->alarm && (ds1307->client->irq > 0 || |
1324 | ds1307_can_wakeup_device)) { | |
97f902b7 WS |
1325 | ds1307->regs[0] |= DS1337_BIT_INTCN |
1326 | | bbsqi_bitpos[ds1307->type]; | |
cb49a5e9 | 1327 | ds1307->regs[0] &= ~(DS1337_BIT_A2IE | DS1337_BIT_A1IE); |
b24a7267 WS |
1328 | |
1329 | want_irq = true; | |
cb49a5e9 RG |
1330 | } |
1331 | ||
1332 | i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, | |
1333 | ds1307->regs[0]); | |
be5f59f4 RG |
1334 | |
1335 | /* oscillator fault? clear flag, and warn */ | |
1336 | if (ds1307->regs[1] & DS1337_BIT_OSF) { | |
1337 | i2c_smbus_write_byte_data(client, DS1337_REG_STATUS, | |
1338 | ds1307->regs[1] & ~DS1337_BIT_OSF); | |
1339 | dev_warn(&client->dev, "SET TIME!\n"); | |
1abb0dc9 | 1340 | } |
045e0e85 | 1341 | break; |
a2166858 MF |
1342 | |
1343 | case rx_8025: | |
1344 | tmp = i2c_smbus_read_i2c_block_data(ds1307->client, | |
1345 | RX8025_REG_CTRL1 << 4 | 0x08, 2, buf); | |
1346 | if (tmp != 2) { | |
6df80e21 | 1347 | dev_dbg(&client->dev, "read error %d\n", tmp); |
a2166858 | 1348 | err = -EIO; |
edca66d2 | 1349 | goto exit; |
a2166858 MF |
1350 | } |
1351 | ||
1352 | /* oscillator off? turn it on, so clock can tick. */ | |
1353 | if (!(ds1307->regs[1] & RX8025_BIT_XST)) { | |
1354 | ds1307->regs[1] |= RX8025_BIT_XST; | |
1355 | i2c_smbus_write_byte_data(client, | |
1356 | RX8025_REG_CTRL2 << 4 | 0x08, | |
1357 | ds1307->regs[1]); | |
1358 | dev_warn(&client->dev, | |
1359 | "oscillator stop detected - SET TIME!\n"); | |
1360 | } | |
1361 | ||
1362 | if (ds1307->regs[1] & RX8025_BIT_PON) { | |
1363 | ds1307->regs[1] &= ~RX8025_BIT_PON; | |
1364 | i2c_smbus_write_byte_data(client, | |
1365 | RX8025_REG_CTRL2 << 4 | 0x08, | |
1366 | ds1307->regs[1]); | |
1367 | dev_warn(&client->dev, "power-on detected\n"); | |
1368 | } | |
1369 | ||
1370 | if (ds1307->regs[1] & RX8025_BIT_VDET) { | |
1371 | ds1307->regs[1] &= ~RX8025_BIT_VDET; | |
1372 | i2c_smbus_write_byte_data(client, | |
1373 | RX8025_REG_CTRL2 << 4 | 0x08, | |
1374 | ds1307->regs[1]); | |
1375 | dev_warn(&client->dev, "voltage drop detected\n"); | |
1376 | } | |
1377 | ||
1378 | /* make sure we are running in 24hour mode */ | |
1379 | if (!(ds1307->regs[0] & RX8025_BIT_2412)) { | |
1380 | u8 hour; | |
1381 | ||
1382 | /* switch to 24 hour mode */ | |
1383 | i2c_smbus_write_byte_data(client, | |
1384 | RX8025_REG_CTRL1 << 4 | 0x08, | |
1385 | ds1307->regs[0] | | |
1386 | RX8025_BIT_2412); | |
1387 | ||
1388 | tmp = i2c_smbus_read_i2c_block_data(ds1307->client, | |
1389 | RX8025_REG_CTRL1 << 4 | 0x08, 2, buf); | |
1390 | if (tmp != 2) { | |
6df80e21 | 1391 | dev_dbg(&client->dev, "read error %d\n", tmp); |
a2166858 | 1392 | err = -EIO; |
edca66d2 | 1393 | goto exit; |
a2166858 MF |
1394 | } |
1395 | ||
1396 | /* correct hour */ | |
1397 | hour = bcd2bin(ds1307->regs[DS1307_REG_HOUR]); | |
1398 | if (hour == 12) | |
1399 | hour = 0; | |
1400 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) | |
1401 | hour += 12; | |
1402 | ||
1403 | i2c_smbus_write_byte_data(client, | |
1404 | DS1307_REG_HOUR << 4 | 0x08, | |
1405 | hour); | |
1406 | } | |
1407 | break; | |
33df2ee1 JT |
1408 | case ds_1388: |
1409 | ds1307->offset = 1; /* Seconds starts at 1 */ | |
1410 | break; | |
f4199f85 TN |
1411 | case mcp794xx: |
1412 | rtc_ops = &mcp794xx_rtc_ops; | |
1d1945d2 | 1413 | if (ds1307->client->irq > 0 && chip->alarm) { |
2fb07a10 | 1414 | irq_handler = mcp794xx_irq; |
1d1945d2 SG |
1415 | want_irq = true; |
1416 | } | |
1417 | break; | |
045e0e85 DB |
1418 | default: |
1419 | break; | |
1420 | } | |
1abb0dc9 DB |
1421 | |
1422 | read_rtc: | |
1423 | /* read RTC registers */ | |
96fc3a45 | 1424 | tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf); |
fed40b73 | 1425 | if (tmp != 8) { |
6df80e21 | 1426 | dev_dbg(&client->dev, "read error %d\n", tmp); |
1abb0dc9 | 1427 | err = -EIO; |
edca66d2 | 1428 | goto exit; |
1abb0dc9 DB |
1429 | } |
1430 | ||
40ce972d DA |
1431 | /* |
1432 | * minimal sanity checking; some chips (like DS1340) don't | |
1abb0dc9 DB |
1433 | * specify the extra bits as must-be-zero, but there are |
1434 | * still a few values that are clearly out-of-range. | |
1435 | */ | |
1436 | tmp = ds1307->regs[DS1307_REG_SECS]; | |
045e0e85 DB |
1437 | switch (ds1307->type) { |
1438 | case ds_1307: | |
045e0e85 | 1439 | case m41t00: |
be5f59f4 | 1440 | /* clock halted? turn it on, so clock can tick. */ |
045e0e85 | 1441 | if (tmp & DS1307_BIT_CH) { |
be5f59f4 RG |
1442 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); |
1443 | dev_warn(&client->dev, "SET TIME!\n"); | |
045e0e85 | 1444 | goto read_rtc; |
1abb0dc9 | 1445 | } |
045e0e85 | 1446 | break; |
be5f59f4 RG |
1447 | case ds_1338: |
1448 | /* clock halted? turn it on, so clock can tick. */ | |
045e0e85 | 1449 | if (tmp & DS1307_BIT_CH) |
be5f59f4 RG |
1450 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); |
1451 | ||
1452 | /* oscillator fault? clear flag, and warn */ | |
1453 | if (ds1307->regs[DS1307_REG_CONTROL] & DS1338_BIT_OSF) { | |
1454 | i2c_smbus_write_byte_data(client, DS1307_REG_CONTROL, | |
bd16f9eb | 1455 | ds1307->regs[DS1307_REG_CONTROL] |
be5f59f4 RG |
1456 | & ~DS1338_BIT_OSF); |
1457 | dev_warn(&client->dev, "SET TIME!\n"); | |
1458 | goto read_rtc; | |
1459 | } | |
045e0e85 | 1460 | break; |
fcd8db00 R |
1461 | case ds_1340: |
1462 | /* clock halted? turn it on, so clock can tick. */ | |
1463 | if (tmp & DS1340_BIT_nEOSC) | |
1464 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, 0); | |
1465 | ||
1466 | tmp = i2c_smbus_read_byte_data(client, DS1340_REG_FLAG); | |
1467 | if (tmp < 0) { | |
6df80e21 | 1468 | dev_dbg(&client->dev, "read error %d\n", tmp); |
fcd8db00 | 1469 | err = -EIO; |
edca66d2 | 1470 | goto exit; |
fcd8db00 R |
1471 | } |
1472 | ||
1473 | /* oscillator fault? clear flag, and warn */ | |
1474 | if (tmp & DS1340_BIT_OSF) { | |
1475 | i2c_smbus_write_byte_data(client, DS1340_REG_FLAG, 0); | |
1476 | dev_warn(&client->dev, "SET TIME!\n"); | |
1477 | } | |
43fcb815 | 1478 | break; |
f4199f85 | 1479 | case mcp794xx: |
43fcb815 | 1480 | /* make sure that the backup battery is enabled */ |
f4199f85 | 1481 | if (!(ds1307->regs[DS1307_REG_WDAY] & MCP794XX_BIT_VBATEN)) { |
43fcb815 DA |
1482 | i2c_smbus_write_byte_data(client, DS1307_REG_WDAY, |
1483 | ds1307->regs[DS1307_REG_WDAY] | |
f4199f85 | 1484 | | MCP794XX_BIT_VBATEN); |
43fcb815 DA |
1485 | } |
1486 | ||
1487 | /* clock halted? turn it on, so clock can tick. */ | |
f4199f85 | 1488 | if (!(tmp & MCP794XX_BIT_ST)) { |
43fcb815 | 1489 | i2c_smbus_write_byte_data(client, DS1307_REG_SECS, |
f4199f85 | 1490 | MCP794XX_BIT_ST); |
43fcb815 DA |
1491 | dev_warn(&client->dev, "SET TIME!\n"); |
1492 | goto read_rtc; | |
1493 | } | |
1494 | ||
fcd8db00 | 1495 | break; |
32d322bc | 1496 | default: |
045e0e85 | 1497 | break; |
1abb0dc9 | 1498 | } |
045e0e85 | 1499 | |
1abb0dc9 | 1500 | tmp = ds1307->regs[DS1307_REG_HOUR]; |
c065f35c DB |
1501 | switch (ds1307->type) { |
1502 | case ds_1340: | |
1503 | case m41t00: | |
40ce972d DA |
1504 | /* |
1505 | * NOTE: ignores century bits; fix before deploying | |
c065f35c DB |
1506 | * systems that will run through year 2100. |
1507 | */ | |
1508 | break; | |
a2166858 MF |
1509 | case rx_8025: |
1510 | break; | |
c065f35c DB |
1511 | default: |
1512 | if (!(tmp & DS1307_BIT_12HR)) | |
1513 | break; | |
1514 | ||
40ce972d DA |
1515 | /* |
1516 | * Be sure we're in 24 hour mode. Multi-master systems | |
c065f35c DB |
1517 | * take note... |
1518 | */ | |
fe20ba70 | 1519 | tmp = bcd2bin(tmp & 0x1f); |
c065f35c DB |
1520 | if (tmp == 12) |
1521 | tmp = 0; | |
1522 | if (ds1307->regs[DS1307_REG_HOUR] & DS1307_BIT_PM) | |
1523 | tmp += 12; | |
1abb0dc9 | 1524 | i2c_smbus_write_byte_data(client, |
96fc3a45 | 1525 | ds1307->offset + DS1307_REG_HOUR, |
fe20ba70 | 1526 | bin2bcd(tmp)); |
1abb0dc9 DB |
1527 | } |
1528 | ||
3abb1ada SG |
1529 | if (want_irq) { |
1530 | device_set_wakeup_capable(&client->dev, true); | |
1531 | set_bit(HAS_ALARM, &ds1307->flags); | |
1532 | } | |
edca66d2 | 1533 | ds1307->rtc = devm_rtc_device_register(&client->dev, client->name, |
1d1945d2 | 1534 | rtc_ops, THIS_MODULE); |
1abb0dc9 | 1535 | if (IS_ERR(ds1307->rtc)) { |
4071ea25 | 1536 | return PTR_ERR(ds1307->rtc); |
1abb0dc9 DB |
1537 | } |
1538 | ||
38a7a73e | 1539 | if (ds1307_can_wakeup_device && ds1307->client->irq <= 0) { |
8bc2a407 ML |
1540 | /* Disable request for an IRQ */ |
1541 | want_irq = false; | |
1542 | dev_info(&client->dev, "'wakeup-source' is set, request for an IRQ is disabled!\n"); | |
1543 | /* We cannot support UIE mode if we do not have an IRQ line */ | |
1544 | ds1307->rtc->uie_unsupported = 1; | |
1545 | } | |
1546 | ||
cb49a5e9 | 1547 | if (want_irq) { |
c5983191 NM |
1548 | err = devm_request_threaded_irq(&client->dev, |
1549 | client->irq, NULL, irq_handler, | |
1550 | IRQF_SHARED | IRQF_ONESHOT, | |
1551 | ds1307->rtc->name, client); | |
cb49a5e9 | 1552 | if (err) { |
4071ea25 | 1553 | client->irq = 0; |
3abb1ada SG |
1554 | device_set_wakeup_capable(&client->dev, false); |
1555 | clear_bit(HAS_ALARM, &ds1307->flags); | |
4071ea25 | 1556 | dev_err(&client->dev, "unable to request IRQ!\n"); |
3abb1ada | 1557 | } else |
51c4cfef | 1558 | dev_dbg(&client->dev, "got IRQ %d\n", client->irq); |
cb49a5e9 RG |
1559 | } |
1560 | ||
9eab0a78 | 1561 | if (chip->nvram_size) { |
4071ea25 | 1562 | |
edca66d2 JH |
1563 | ds1307->nvram = devm_kzalloc(&client->dev, |
1564 | sizeof(struct bin_attribute), | |
1565 | GFP_KERNEL); | |
9eab0a78 | 1566 | if (!ds1307->nvram) { |
4071ea25 AZ |
1567 | dev_err(&client->dev, "cannot allocate memory for nvram sysfs\n"); |
1568 | } else { | |
1569 | ||
1570 | ds1307->nvram->attr.name = "nvram"; | |
1571 | ds1307->nvram->attr.mode = S_IRUGO | S_IWUSR; | |
1572 | ||
1573 | sysfs_bin_attr_init(ds1307->nvram); | |
1574 | ||
1575 | ds1307->nvram->read = ds1307_nvram_read; | |
1576 | ds1307->nvram->write = ds1307_nvram_write; | |
1577 | ds1307->nvram->size = chip->nvram_size; | |
1578 | ds1307->nvram_offset = chip->nvram_offset; | |
1579 | ||
1580 | err = sysfs_create_bin_file(&client->dev.kobj, | |
1581 | ds1307->nvram); | |
1582 | if (err) { | |
1583 | dev_err(&client->dev, | |
1584 | "unable to create sysfs file: %s\n", | |
1585 | ds1307->nvram->attr.name); | |
1586 | } else { | |
1587 | set_bit(HAS_NVRAM, &ds1307->flags); | |
1588 | dev_info(&client->dev, "%zu bytes nvram\n", | |
1589 | ds1307->nvram->size); | |
1590 | } | |
9eab0a78 | 1591 | } |
682d73f6 DB |
1592 | } |
1593 | ||
445c0207 | 1594 | ds1307_hwmon_register(ds1307); |
6c6ff145 | 1595 | ds1307_clks_register(ds1307); |
445c0207 | 1596 | |
1abb0dc9 DB |
1597 | return 0; |
1598 | ||
edca66d2 | 1599 | exit: |
1abb0dc9 DB |
1600 | return err; |
1601 | } | |
1602 | ||
5a167f45 | 1603 | static int ds1307_remove(struct i2c_client *client) |
1abb0dc9 | 1604 | { |
40ce972d | 1605 | struct ds1307 *ds1307 = i2c_get_clientdata(client); |
cb49a5e9 | 1606 | |
edca66d2 | 1607 | if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags)) |
9eab0a78 | 1608 | sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram); |
682d73f6 | 1609 | |
1abb0dc9 DB |
1610 | return 0; |
1611 | } | |
1612 | ||
1613 | static struct i2c_driver ds1307_driver = { | |
1614 | .driver = { | |
c065f35c | 1615 | .name = "rtc-ds1307", |
1abb0dc9 | 1616 | }, |
c065f35c | 1617 | .probe = ds1307_probe, |
5a167f45 | 1618 | .remove = ds1307_remove, |
3760f736 | 1619 | .id_table = ds1307_id, |
1abb0dc9 DB |
1620 | }; |
1621 | ||
0abc9201 | 1622 | module_i2c_driver(ds1307_driver); |
1abb0dc9 DB |
1623 | |
1624 | MODULE_DESCRIPTION("RTC driver for DS1307 and similar chips"); | |
1625 | MODULE_LICENSE("GPL"); |