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1 | /* | |
2 | * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs | |
3 | * | |
4 | * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net> | |
5 | * Copyright (C) 2006 Tower Technologies | |
6 | * Copyright (C) 2008 Paul Mundt | |
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/i2c.h> | |
14 | #include <linux/rtc.h> | |
15 | #include <linux/bcd.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/module.h> | |
18 | ||
19 | /* | |
20 | * Ricoh has a family of I2C based RTCs, which differ only slightly from | |
21 | * each other. Differences center on pinout (e.g. how many interrupts, | |
22 | * output clock, etc) and how the control registers are used. The '372 | |
23 | * is significant only because that's the one this driver first supported. | |
24 | */ | |
25 | #define RS5C372_REG_SECS 0 | |
26 | #define RS5C372_REG_MINS 1 | |
27 | #define RS5C372_REG_HOURS 2 | |
28 | #define RS5C372_REG_WDAY 3 | |
29 | #define RS5C372_REG_DAY 4 | |
30 | #define RS5C372_REG_MONTH 5 | |
31 | #define RS5C372_REG_YEAR 6 | |
32 | #define RS5C372_REG_TRIM 7 | |
33 | # define RS5C372_TRIM_XSL 0x80 | |
34 | # define RS5C372_TRIM_MASK 0x7F | |
35 | ||
36 | #define RS5C_REG_ALARM_A_MIN 8 /* or ALARM_W */ | |
37 | #define RS5C_REG_ALARM_A_HOURS 9 | |
38 | #define RS5C_REG_ALARM_A_WDAY 10 | |
39 | ||
40 | #define RS5C_REG_ALARM_B_MIN 11 /* or ALARM_D */ | |
41 | #define RS5C_REG_ALARM_B_HOURS 12 | |
42 | #define RS5C_REG_ALARM_B_WDAY 13 /* (ALARM_B only) */ | |
43 | ||
44 | #define RS5C_REG_CTRL1 14 | |
45 | # define RS5C_CTRL1_AALE (1 << 7) /* or WALE */ | |
46 | # define RS5C_CTRL1_BALE (1 << 6) /* or DALE */ | |
47 | # define RV5C387_CTRL1_24 (1 << 5) | |
48 | # define RS5C372A_CTRL1_SL1 (1 << 5) | |
49 | # define RS5C_CTRL1_CT_MASK (7 << 0) | |
50 | # define RS5C_CTRL1_CT0 (0 << 0) /* no periodic irq */ | |
51 | # define RS5C_CTRL1_CT4 (4 << 0) /* 1 Hz level irq */ | |
52 | #define RS5C_REG_CTRL2 15 | |
53 | # define RS5C372_CTRL2_24 (1 << 5) | |
54 | # define R2025_CTRL2_XST (1 << 5) | |
55 | # define RS5C_CTRL2_XSTP (1 << 4) /* only if !R2025S/D */ | |
56 | # define RS5C_CTRL2_CTFG (1 << 2) | |
57 | # define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */ | |
58 | # define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */ | |
59 | ||
60 | ||
61 | /* to read (style 1) or write registers starting at R */ | |
62 | #define RS5C_ADDR(R) (((R) << 4) | 0) | |
63 | ||
64 | ||
65 | enum rtc_type { | |
66 | rtc_undef = 0, | |
67 | rtc_r2025sd, | |
68 | rtc_r2221tl, | |
69 | rtc_rs5c372a, | |
70 | rtc_rs5c372b, | |
71 | rtc_rv5c386, | |
72 | rtc_rv5c387a, | |
73 | }; | |
74 | ||
75 | static const struct i2c_device_id rs5c372_id[] = { | |
76 | { "r2025sd", rtc_r2025sd }, | |
77 | { "r2221tl", rtc_r2221tl }, | |
78 | { "rs5c372a", rtc_rs5c372a }, | |
79 | { "rs5c372b", rtc_rs5c372b }, | |
80 | { "rv5c386", rtc_rv5c386 }, | |
81 | { "rv5c387a", rtc_rv5c387a }, | |
82 | { } | |
83 | }; | |
84 | MODULE_DEVICE_TABLE(i2c, rs5c372_id); | |
85 | ||
86 | /* REVISIT: this assumes that: | |
87 | * - we're in the 21st century, so it's safe to ignore the century | |
88 | * bit for rv5c38[67] (REG_MONTH bit 7); | |
89 | * - we should use ALARM_A not ALARM_B (may be wrong on some boards) | |
90 | */ | |
91 | struct rs5c372 { | |
92 | struct i2c_client *client; | |
93 | struct rtc_device *rtc; | |
94 | enum rtc_type type; | |
95 | unsigned time24:1; | |
96 | unsigned has_irq:1; | |
97 | unsigned smbus:1; | |
98 | char buf[17]; | |
99 | char *regs; | |
100 | }; | |
101 | ||
102 | static int rs5c_get_regs(struct rs5c372 *rs5c) | |
103 | { | |
104 | struct i2c_client *client = rs5c->client; | |
105 | struct i2c_msg msgs[] = { | |
106 | { | |
107 | .addr = client->addr, | |
108 | .flags = I2C_M_RD, | |
109 | .len = sizeof(rs5c->buf), | |
110 | .buf = rs5c->buf | |
111 | }, | |
112 | }; | |
113 | ||
114 | /* This implements the third reading method from the datasheet, using | |
115 | * an internal address that's reset after each transaction (by STOP) | |
116 | * to 0x0f ... so we read extra registers, and skip the first one. | |
117 | * | |
118 | * The first method doesn't work with the iop3xx adapter driver, on at | |
119 | * least 80219 chips; this works around that bug. | |
120 | * | |
121 | * The third method on the other hand doesn't work for the SMBus-only | |
122 | * configurations, so we use the the first method there, stripping off | |
123 | * the extra register in the process. | |
124 | */ | |
125 | if (rs5c->smbus) { | |
126 | int addr = RS5C_ADDR(RS5C372_REG_SECS); | |
127 | int size = sizeof(rs5c->buf) - 1; | |
128 | ||
129 | if (i2c_smbus_read_i2c_block_data(client, addr, size, | |
130 | rs5c->buf + 1) != size) { | |
131 | dev_warn(&client->dev, "can't read registers\n"); | |
132 | return -EIO; | |
133 | } | |
134 | } else { | |
135 | if ((i2c_transfer(client->adapter, msgs, 1)) != 1) { | |
136 | dev_warn(&client->dev, "can't read registers\n"); | |
137 | return -EIO; | |
138 | } | |
139 | } | |
140 | ||
141 | dev_dbg(&client->dev, | |
142 | "%3ph (%02x) %3ph (%02x), %3ph, %3ph; %02x %02x\n", | |
143 | rs5c->regs + 0, rs5c->regs[3], | |
144 | rs5c->regs + 4, rs5c->regs[7], | |
145 | rs5c->regs + 8, rs5c->regs + 11, | |
146 | rs5c->regs[14], rs5c->regs[15]); | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg) | |
152 | { | |
153 | unsigned hour; | |
154 | ||
155 | if (rs5c->time24) | |
156 | return bcd2bin(reg & 0x3f); | |
157 | ||
158 | hour = bcd2bin(reg & 0x1f); | |
159 | if (hour == 12) | |
160 | hour = 0; | |
161 | if (reg & 0x20) | |
162 | hour += 12; | |
163 | return hour; | |
164 | } | |
165 | ||
166 | static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour) | |
167 | { | |
168 | if (rs5c->time24) | |
169 | return bin2bcd(hour); | |
170 | ||
171 | if (hour > 12) | |
172 | return 0x20 | bin2bcd(hour - 12); | |
173 | if (hour == 12) | |
174 | return 0x20 | bin2bcd(12); | |
175 | if (hour == 0) | |
176 | return bin2bcd(12); | |
177 | return bin2bcd(hour); | |
178 | } | |
179 | ||
180 | static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm) | |
181 | { | |
182 | struct rs5c372 *rs5c = i2c_get_clientdata(client); | |
183 | int status = rs5c_get_regs(rs5c); | |
184 | ||
185 | if (status < 0) | |
186 | return status; | |
187 | ||
188 | tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f); | |
189 | tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f); | |
190 | tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]); | |
191 | ||
192 | tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07); | |
193 | tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f); | |
194 | ||
195 | /* tm->tm_mon is zero-based */ | |
196 | tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1; | |
197 | ||
198 | /* year is 1900 + tm->tm_year */ | |
199 | tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100; | |
200 | ||
201 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, " | |
202 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
203 | __func__, | |
204 | tm->tm_sec, tm->tm_min, tm->tm_hour, | |
205 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
206 | ||
207 | /* rtc might need initialization */ | |
208 | return rtc_valid_tm(tm); | |
209 | } | |
210 | ||
211 | static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm) | |
212 | { | |
213 | struct rs5c372 *rs5c = i2c_get_clientdata(client); | |
214 | unsigned char buf[7]; | |
215 | int addr; | |
216 | ||
217 | dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d " | |
218 | "mday=%d, mon=%d, year=%d, wday=%d\n", | |
219 | __func__, | |
220 | tm->tm_sec, tm->tm_min, tm->tm_hour, | |
221 | tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday); | |
222 | ||
223 | addr = RS5C_ADDR(RS5C372_REG_SECS); | |
224 | buf[0] = bin2bcd(tm->tm_sec); | |
225 | buf[1] = bin2bcd(tm->tm_min); | |
226 | buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour); | |
227 | buf[3] = bin2bcd(tm->tm_wday); | |
228 | buf[4] = bin2bcd(tm->tm_mday); | |
229 | buf[5] = bin2bcd(tm->tm_mon + 1); | |
230 | buf[6] = bin2bcd(tm->tm_year - 100); | |
231 | ||
232 | if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) { | |
233 | dev_err(&client->dev, "%s: write error\n", __func__); | |
234 | return -EIO; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | #if IS_ENABLED(CONFIG_RTC_INTF_PROC) | |
241 | #define NEED_TRIM | |
242 | #endif | |
243 | ||
244 | #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) | |
245 | #define NEED_TRIM | |
246 | #endif | |
247 | ||
248 | #ifdef NEED_TRIM | |
249 | static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim) | |
250 | { | |
251 | struct rs5c372 *rs5c372 = i2c_get_clientdata(client); | |
252 | u8 tmp = rs5c372->regs[RS5C372_REG_TRIM]; | |
253 | ||
254 | if (osc) | |
255 | *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768; | |
256 | ||
257 | if (trim) { | |
258 | dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp); | |
259 | tmp &= RS5C372_TRIM_MASK; | |
260 | if (tmp & 0x3e) { | |
261 | int t = tmp & 0x3f; | |
262 | ||
263 | if (tmp & 0x40) | |
264 | t = (~t | (s8)0xc0) + 1; | |
265 | else | |
266 | t = t - 1; | |
267 | ||
268 | tmp = t * 2; | |
269 | } else | |
270 | tmp = 0; | |
271 | *trim = tmp; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | #endif | |
277 | ||
278 | static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
279 | { | |
280 | return rs5c372_get_datetime(to_i2c_client(dev), tm); | |
281 | } | |
282 | ||
283 | static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
284 | { | |
285 | return rs5c372_set_datetime(to_i2c_client(dev), tm); | |
286 | } | |
287 | ||
288 | ||
289 | static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
290 | { | |
291 | struct i2c_client *client = to_i2c_client(dev); | |
292 | struct rs5c372 *rs5c = i2c_get_clientdata(client); | |
293 | unsigned char buf; | |
294 | int status, addr; | |
295 | ||
296 | buf = rs5c->regs[RS5C_REG_CTRL1]; | |
297 | ||
298 | if (!rs5c->has_irq) | |
299 | return -EINVAL; | |
300 | ||
301 | status = rs5c_get_regs(rs5c); | |
302 | if (status < 0) | |
303 | return status; | |
304 | ||
305 | addr = RS5C_ADDR(RS5C_REG_CTRL1); | |
306 | if (enabled) | |
307 | buf |= RS5C_CTRL1_AALE; | |
308 | else | |
309 | buf &= ~RS5C_CTRL1_AALE; | |
310 | ||
311 | if (i2c_smbus_write_byte_data(client, addr, buf) < 0) { | |
312 | dev_warn(dev, "can't update alarm\n"); | |
313 | status = -EIO; | |
314 | } else | |
315 | rs5c->regs[RS5C_REG_CTRL1] = buf; | |
316 | ||
317 | return status; | |
318 | } | |
319 | ||
320 | ||
321 | /* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI, | |
322 | * which only exposes a polled programming interface; and since | |
323 | * these calls map directly to those EFI requests; we don't demand | |
324 | * we have an IRQ for this chip when we go through this API. | |
325 | * | |
326 | * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs | |
327 | * though, managed through RTC_AIE_{ON,OFF} requests. | |
328 | */ | |
329 | ||
330 | static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
331 | { | |
332 | struct i2c_client *client = to_i2c_client(dev); | |
333 | struct rs5c372 *rs5c = i2c_get_clientdata(client); | |
334 | int status; | |
335 | ||
336 | status = rs5c_get_regs(rs5c); | |
337 | if (status < 0) | |
338 | return status; | |
339 | ||
340 | /* report alarm time */ | |
341 | t->time.tm_sec = 0; | |
342 | t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f); | |
343 | t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]); | |
344 | ||
345 | /* ... and status */ | |
346 | t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE); | |
347 | t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
353 | { | |
354 | struct i2c_client *client = to_i2c_client(dev); | |
355 | struct rs5c372 *rs5c = i2c_get_clientdata(client); | |
356 | int status, addr, i; | |
357 | unsigned char buf[3]; | |
358 | ||
359 | /* only handle up to 24 hours in the future, like RTC_ALM_SET */ | |
360 | if (t->time.tm_mday != -1 | |
361 | || t->time.tm_mon != -1 | |
362 | || t->time.tm_year != -1) | |
363 | return -EINVAL; | |
364 | ||
365 | /* REVISIT: round up tm_sec */ | |
366 | ||
367 | /* if needed, disable irq (clears pending status) */ | |
368 | status = rs5c_get_regs(rs5c); | |
369 | if (status < 0) | |
370 | return status; | |
371 | if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) { | |
372 | addr = RS5C_ADDR(RS5C_REG_CTRL1); | |
373 | buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE; | |
374 | if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) { | |
375 | dev_dbg(dev, "can't disable alarm\n"); | |
376 | return -EIO; | |
377 | } | |
378 | rs5c->regs[RS5C_REG_CTRL1] = buf[0]; | |
379 | } | |
380 | ||
381 | /* set alarm */ | |
382 | buf[0] = bin2bcd(t->time.tm_min); | |
383 | buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour); | |
384 | buf[2] = 0x7f; /* any/all days */ | |
385 | ||
386 | for (i = 0; i < sizeof(buf); i++) { | |
387 | addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i); | |
388 | if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) { | |
389 | dev_dbg(dev, "can't set alarm time\n"); | |
390 | return -EIO; | |
391 | } | |
392 | } | |
393 | ||
394 | /* ... and maybe enable its irq */ | |
395 | if (t->enabled) { | |
396 | addr = RS5C_ADDR(RS5C_REG_CTRL1); | |
397 | buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE; | |
398 | if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) | |
399 | dev_warn(dev, "can't enable alarm\n"); | |
400 | rs5c->regs[RS5C_REG_CTRL1] = buf[0]; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | #if IS_ENABLED(CONFIG_RTC_INTF_PROC) | |
407 | ||
408 | static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq) | |
409 | { | |
410 | int err, osc, trim; | |
411 | ||
412 | err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim); | |
413 | if (err == 0) { | |
414 | seq_printf(seq, "crystal\t\t: %d.%03d KHz\n", | |
415 | osc / 1000, osc % 1000); | |
416 | seq_printf(seq, "trim\t\t: %d\n", trim); | |
417 | } | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | #else | |
423 | #define rs5c372_rtc_proc NULL | |
424 | #endif | |
425 | ||
426 | static const struct rtc_class_ops rs5c372_rtc_ops = { | |
427 | .proc = rs5c372_rtc_proc, | |
428 | .read_time = rs5c372_rtc_read_time, | |
429 | .set_time = rs5c372_rtc_set_time, | |
430 | .read_alarm = rs5c_read_alarm, | |
431 | .set_alarm = rs5c_set_alarm, | |
432 | .alarm_irq_enable = rs5c_rtc_alarm_irq_enable, | |
433 | }; | |
434 | ||
435 | #if IS_ENABLED(CONFIG_RTC_INTF_SYSFS) | |
436 | ||
437 | static ssize_t rs5c372_sysfs_show_trim(struct device *dev, | |
438 | struct device_attribute *attr, char *buf) | |
439 | { | |
440 | int err, trim; | |
441 | ||
442 | err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim); | |
443 | if (err) | |
444 | return err; | |
445 | ||
446 | return sprintf(buf, "%d\n", trim); | |
447 | } | |
448 | static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL); | |
449 | ||
450 | static ssize_t rs5c372_sysfs_show_osc(struct device *dev, | |
451 | struct device_attribute *attr, char *buf) | |
452 | { | |
453 | int err, osc; | |
454 | ||
455 | err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL); | |
456 | if (err) | |
457 | return err; | |
458 | ||
459 | return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000); | |
460 | } | |
461 | static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL); | |
462 | ||
463 | static int rs5c_sysfs_register(struct device *dev) | |
464 | { | |
465 | int err; | |
466 | ||
467 | err = device_create_file(dev, &dev_attr_trim); | |
468 | if (err) | |
469 | return err; | |
470 | err = device_create_file(dev, &dev_attr_osc); | |
471 | if (err) | |
472 | device_remove_file(dev, &dev_attr_trim); | |
473 | ||
474 | return err; | |
475 | } | |
476 | ||
477 | static void rs5c_sysfs_unregister(struct device *dev) | |
478 | { | |
479 | device_remove_file(dev, &dev_attr_trim); | |
480 | device_remove_file(dev, &dev_attr_osc); | |
481 | } | |
482 | ||
483 | #else | |
484 | static int rs5c_sysfs_register(struct device *dev) | |
485 | { | |
486 | return 0; | |
487 | } | |
488 | ||
489 | static void rs5c_sysfs_unregister(struct device *dev) | |
490 | { | |
491 | /* nothing */ | |
492 | } | |
493 | #endif /* SYSFS */ | |
494 | ||
495 | static struct i2c_driver rs5c372_driver; | |
496 | ||
497 | static int rs5c_oscillator_setup(struct rs5c372 *rs5c372) | |
498 | { | |
499 | unsigned char buf[2]; | |
500 | int addr, i, ret = 0; | |
501 | ||
502 | if (rs5c372->type == rtc_r2025sd) { | |
503 | if (rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST) | |
504 | return ret; | |
505 | rs5c372->regs[RS5C_REG_CTRL2] |= R2025_CTRL2_XST; | |
506 | } else { | |
507 | if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP)) | |
508 | return ret; | |
509 | rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP; | |
510 | } | |
511 | ||
512 | addr = RS5C_ADDR(RS5C_REG_CTRL1); | |
513 | buf[0] = rs5c372->regs[RS5C_REG_CTRL1]; | |
514 | buf[1] = rs5c372->regs[RS5C_REG_CTRL2]; | |
515 | ||
516 | /* use 24hr mode */ | |
517 | switch (rs5c372->type) { | |
518 | case rtc_rs5c372a: | |
519 | case rtc_rs5c372b: | |
520 | buf[1] |= RS5C372_CTRL2_24; | |
521 | rs5c372->time24 = 1; | |
522 | break; | |
523 | case rtc_r2025sd: | |
524 | case rtc_r2221tl: | |
525 | case rtc_rv5c386: | |
526 | case rtc_rv5c387a: | |
527 | buf[0] |= RV5C387_CTRL1_24; | |
528 | rs5c372->time24 = 1; | |
529 | break; | |
530 | default: | |
531 | /* impossible */ | |
532 | break; | |
533 | } | |
534 | ||
535 | for (i = 0; i < sizeof(buf); i++) { | |
536 | addr = RS5C_ADDR(RS5C_REG_CTRL1 + i); | |
537 | ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]); | |
538 | if (unlikely(ret < 0)) | |
539 | return ret; | |
540 | } | |
541 | ||
542 | rs5c372->regs[RS5C_REG_CTRL1] = buf[0]; | |
543 | rs5c372->regs[RS5C_REG_CTRL2] = buf[1]; | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | static int rs5c372_probe(struct i2c_client *client, | |
549 | const struct i2c_device_id *id) | |
550 | { | |
551 | int err = 0; | |
552 | int smbus_mode = 0; | |
553 | struct rs5c372 *rs5c372; | |
554 | struct rtc_time tm; | |
555 | ||
556 | dev_dbg(&client->dev, "%s\n", __func__); | |
557 | ||
558 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C | | |
559 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) { | |
560 | /* | |
561 | * If we don't have any master mode adapter, try breaking | |
562 | * it down in to the barest of capabilities. | |
563 | */ | |
564 | if (i2c_check_functionality(client->adapter, | |
565 | I2C_FUNC_SMBUS_BYTE_DATA | | |
566 | I2C_FUNC_SMBUS_I2C_BLOCK)) | |
567 | smbus_mode = 1; | |
568 | else { | |
569 | /* Still no good, give up */ | |
570 | err = -ENODEV; | |
571 | goto exit; | |
572 | } | |
573 | } | |
574 | ||
575 | rs5c372 = devm_kzalloc(&client->dev, sizeof(struct rs5c372), | |
576 | GFP_KERNEL); | |
577 | if (!rs5c372) { | |
578 | err = -ENOMEM; | |
579 | goto exit; | |
580 | } | |
581 | ||
582 | rs5c372->client = client; | |
583 | i2c_set_clientdata(client, rs5c372); | |
584 | rs5c372->type = id->driver_data; | |
585 | ||
586 | /* we read registers 0x0f then 0x00-0x0f; skip the first one */ | |
587 | rs5c372->regs = &rs5c372->buf[1]; | |
588 | rs5c372->smbus = smbus_mode; | |
589 | ||
590 | err = rs5c_get_regs(rs5c372); | |
591 | if (err < 0) | |
592 | goto exit; | |
593 | ||
594 | /* clock may be set for am/pm or 24 hr time */ | |
595 | switch (rs5c372->type) { | |
596 | case rtc_rs5c372a: | |
597 | case rtc_rs5c372b: | |
598 | /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b. | |
599 | * so does periodic irq, except some 327a modes. | |
600 | */ | |
601 | if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24) | |
602 | rs5c372->time24 = 1; | |
603 | break; | |
604 | case rtc_r2025sd: | |
605 | case rtc_r2221tl: | |
606 | case rtc_rv5c386: | |
607 | case rtc_rv5c387a: | |
608 | if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24) | |
609 | rs5c372->time24 = 1; | |
610 | /* alarm uses ALARM_W; and nINTRB for alarm and periodic | |
611 | * irq, on both 386 and 387 | |
612 | */ | |
613 | break; | |
614 | default: | |
615 | dev_err(&client->dev, "unknown RTC type\n"); | |
616 | goto exit; | |
617 | } | |
618 | ||
619 | /* if the oscillator lost power and no other software (like | |
620 | * the bootloader) set it up, do it here. | |
621 | * | |
622 | * The R2025S/D does this a little differently than the other | |
623 | * parts, so we special case that.. | |
624 | */ | |
625 | err = rs5c_oscillator_setup(rs5c372); | |
626 | if (unlikely(err < 0)) { | |
627 | dev_err(&client->dev, "setup error\n"); | |
628 | goto exit; | |
629 | } | |
630 | ||
631 | if (rs5c372_get_datetime(client, &tm) < 0) | |
632 | dev_warn(&client->dev, "clock needs to be set\n"); | |
633 | ||
634 | dev_info(&client->dev, "%s found, %s\n", | |
635 | ({ char *s; switch (rs5c372->type) { | |
636 | case rtc_r2025sd: s = "r2025sd"; break; | |
637 | case rtc_r2221tl: s = "r2221tl"; break; | |
638 | case rtc_rs5c372a: s = "rs5c372a"; break; | |
639 | case rtc_rs5c372b: s = "rs5c372b"; break; | |
640 | case rtc_rv5c386: s = "rv5c386"; break; | |
641 | case rtc_rv5c387a: s = "rv5c387a"; break; | |
642 | default: s = "chip"; break; | |
643 | }; s;}), | |
644 | rs5c372->time24 ? "24hr" : "am/pm" | |
645 | ); | |
646 | ||
647 | /* REVISIT use client->irq to register alarm irq ... */ | |
648 | rs5c372->rtc = devm_rtc_device_register(&client->dev, | |
649 | rs5c372_driver.driver.name, | |
650 | &rs5c372_rtc_ops, THIS_MODULE); | |
651 | ||
652 | if (IS_ERR(rs5c372->rtc)) { | |
653 | err = PTR_ERR(rs5c372->rtc); | |
654 | goto exit; | |
655 | } | |
656 | ||
657 | err = rs5c_sysfs_register(&client->dev); | |
658 | if (err) | |
659 | goto exit; | |
660 | ||
661 | return 0; | |
662 | ||
663 | exit: | |
664 | return err; | |
665 | } | |
666 | ||
667 | static int rs5c372_remove(struct i2c_client *client) | |
668 | { | |
669 | rs5c_sysfs_unregister(&client->dev); | |
670 | return 0; | |
671 | } | |
672 | ||
673 | static struct i2c_driver rs5c372_driver = { | |
674 | .driver = { | |
675 | .name = "rtc-rs5c372", | |
676 | }, | |
677 | .probe = rs5c372_probe, | |
678 | .remove = rs5c372_remove, | |
679 | .id_table = rs5c372_id, | |
680 | }; | |
681 | ||
682 | module_i2c_driver(rs5c372_driver); | |
683 | ||
684 | MODULE_AUTHOR( | |
685 | "Pavel Mironchik <pmironchik@optifacio.net>, " | |
686 | "Alessandro Zummo <a.zummo@towertech.it>, " | |
687 | "Paul Mundt <lethal@linux-sh.org>"); | |
688 | MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver"); | |
689 | MODULE_LICENSE("GPL"); |