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Alessandro Zummo7520b942006-03-27 01:16:45 -08001/*
David Brownellcb26b572007-01-05 16:36:37 -08002 * An I2C driver for Ricoh RS5C372 and RV5C38[67] RTCs
Alessandro Zummo7520b942006-03-27 01:16:45 -08003 *
4 * Copyright (C) 2005 Pavel Mironchik <pmironchik@optifacio.net>
5 * Copyright (C) 2006 Tower Technologies
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/i2c.h>
13#include <linux/rtc.h>
14#include <linux/bcd.h>
15
David Brownelld8154612007-07-17 04:04:55 -070016#define DRV_VERSION "0.5"
Alessandro Zummo7520b942006-03-27 01:16:45 -080017
David Brownellcb26b572007-01-05 16:36:37 -080018
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 */
Alessandro Zummo7520b942006-03-27 01:16:45 -080025#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
David Brownellcb26b572007-01-05 16:36:37 -080033# define RS5C372_TRIM_XSL 0x80
34# define RS5C372_TRIM_MASK 0x7F
Alessandro Zummo7520b942006-03-27 01:16:45 -080035
David Brownellcb26b572007-01-05 16:36:37 -080036#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
Alessandro Zummo7520b942006-03-27 01:16:45 -080039
David Brownellcb26b572007-01-05 16:36:37 -080040#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) */
Alessandro Zummo7520b942006-03-27 01:16:45 -080043
David Brownellcb26b572007-01-05 16:36:37 -080044#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 RS5C_CTRL2_XSTP (1 << 4)
55# define RS5C_CTRL2_CTFG (1 << 2)
56# define RS5C_CTRL2_AAFG (1 << 1) /* or WAFG */
57# define RS5C_CTRL2_BAFG (1 << 0) /* or DAFG */
Alessandro Zummo7520b942006-03-27 01:16:45 -080058
David Brownellcb26b572007-01-05 16:36:37 -080059
60/* to read (style 1) or write registers starting at R */
61#define RS5C_ADDR(R) (((R) << 4) | 0)
62
63
64enum rtc_type {
65 rtc_undef = 0,
66 rtc_rs5c372a,
67 rtc_rs5c372b,
68 rtc_rv5c386,
69 rtc_rv5c387a,
70};
71
Jean Delvare3760f732008-04-29 23:11:40 +020072static const struct i2c_device_id rs5c372_id[] = {
73 { "rs5c372a", rtc_rs5c372a },
74 { "rs5c372b", rtc_rs5c372b },
75 { "rv5c386", rtc_rv5c386 },
76 { "rv5c387a", rtc_rv5c387a },
77 { }
78};
79MODULE_DEVICE_TABLE(i2c, rs5c372_id);
80
David Brownellcb26b572007-01-05 16:36:37 -080081/* REVISIT: this assumes that:
82 * - we're in the 21st century, so it's safe to ignore the century
83 * bit for rv5c38[67] (REG_MONTH bit 7);
84 * - we should use ALARM_A not ALARM_B (may be wrong on some boards)
85 */
Riku Voipioc6f24f92006-12-06 20:39:13 -080086struct rs5c372 {
David Brownellcb26b572007-01-05 16:36:37 -080087 struct i2c_client *client;
88 struct rtc_device *rtc;
89 enum rtc_type type;
90 unsigned time24:1;
91 unsigned has_irq:1;
92 char buf[17];
93 char *regs;
Riku Voipioc6f24f92006-12-06 20:39:13 -080094};
95
David Brownellcb26b572007-01-05 16:36:37 -080096static int rs5c_get_regs(struct rs5c372 *rs5c)
Alessandro Zummo7520b942006-03-27 01:16:45 -080097{
David Brownellcb26b572007-01-05 16:36:37 -080098 struct i2c_client *client = rs5c->client;
99 struct i2c_msg msgs[] = {
100 { client->addr, I2C_M_RD, sizeof rs5c->buf, rs5c->buf },
101 };
Alessandro Zummo7520b942006-03-27 01:16:45 -0800102
David Brownellcb26b572007-01-05 16:36:37 -0800103 /* This implements the third reading method from the datasheet, using
104 * an internal address that's reset after each transaction (by STOP)
105 * to 0x0f ... so we read extra registers, and skip the first one.
106 *
107 * The first method doesn't work with the iop3xx adapter driver, on at
108 * least 80219 chips; this works around that bug.
Alessandro Zummo7520b942006-03-27 01:16:45 -0800109 */
David Brownellcb26b572007-01-05 16:36:37 -0800110 if ((i2c_transfer(client->adapter, msgs, 1)) != 1) {
Paul Mundte2bfe342008-04-28 02:11:57 -0700111 dev_warn(&client->dev, "can't read registers\n");
Alessandro Zummo7520b942006-03-27 01:16:45 -0800112 return -EIO;
113 }
114
David Brownellcb26b572007-01-05 16:36:37 -0800115 dev_dbg(&client->dev,
116 "%02x %02x %02x (%02x) %02x %02x %02x (%02x), "
117 "%02x %02x %02x, %02x %02x %02x; %02x %02x\n",
118 rs5c->regs[0], rs5c->regs[1], rs5c->regs[2], rs5c->regs[3],
119 rs5c->regs[4], rs5c->regs[5], rs5c->regs[6], rs5c->regs[7],
120 rs5c->regs[8], rs5c->regs[9], rs5c->regs[10], rs5c->regs[11],
121 rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]);
122
123 return 0;
124}
125
126static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg)
127{
128 unsigned hour;
129
130 if (rs5c->time24)
131 return BCD2BIN(reg & 0x3f);
132
133 hour = BCD2BIN(reg & 0x1f);
134 if (hour == 12)
135 hour = 0;
136 if (reg & 0x20)
137 hour += 12;
138 return hour;
139}
140
141static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour)
142{
143 if (rs5c->time24)
144 return BIN2BCD(hour);
145
146 if (hour > 12)
147 return 0x20 | BIN2BCD(hour - 12);
148 if (hour == 12)
149 return 0x20 | BIN2BCD(12);
150 if (hour == 0)
151 return BIN2BCD(12);
152 return BIN2BCD(hour);
153}
154
155static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm)
156{
157 struct rs5c372 *rs5c = i2c_get_clientdata(client);
158 int status = rs5c_get_regs(rs5c);
159
160 if (status < 0)
161 return status;
162
163 tm->tm_sec = BCD2BIN(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
164 tm->tm_min = BCD2BIN(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
165 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);
166
167 tm->tm_wday = BCD2BIN(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
168 tm->tm_mday = BCD2BIN(rs5c->regs[RS5C372_REG_DAY] & 0x3f);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800169
170 /* tm->tm_mon is zero-based */
David Brownellcb26b572007-01-05 16:36:37 -0800171 tm->tm_mon = BCD2BIN(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800172
173 /* year is 1900 + tm->tm_year */
David Brownellcb26b572007-01-05 16:36:37 -0800174 tm->tm_year = BCD2BIN(rs5c->regs[RS5C372_REG_YEAR]) + 100;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800175
176 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
177 "mday=%d, mon=%d, year=%d, wday=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700178 __func__,
Alessandro Zummo7520b942006-03-27 01:16:45 -0800179 tm->tm_sec, tm->tm_min, tm->tm_hour,
180 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
181
David Brownellcb26b572007-01-05 16:36:37 -0800182 /* rtc might need initialization */
183 return rtc_valid_tm(tm);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800184}
185
186static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
187{
David Brownellcb26b572007-01-05 16:36:37 -0800188 struct rs5c372 *rs5c = i2c_get_clientdata(client);
189 unsigned char buf[8];
Alessandro Zummo7520b942006-03-27 01:16:45 -0800190
David Brownellcb26b572007-01-05 16:36:37 -0800191 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
Alessandro Zummo7520b942006-03-27 01:16:45 -0800192 "mday=%d, mon=%d, year=%d, wday=%d\n",
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700193 __func__,
David Brownellcb26b572007-01-05 16:36:37 -0800194 tm->tm_sec, tm->tm_min, tm->tm_hour,
Alessandro Zummo7520b942006-03-27 01:16:45 -0800195 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
196
David Brownellcb26b572007-01-05 16:36:37 -0800197 buf[0] = RS5C_ADDR(RS5C372_REG_SECS);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800198 buf[1] = BIN2BCD(tm->tm_sec);
199 buf[2] = BIN2BCD(tm->tm_min);
David Brownellcb26b572007-01-05 16:36:37 -0800200 buf[3] = rs5c_hr2reg(rs5c, tm->tm_hour);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800201 buf[4] = BIN2BCD(tm->tm_wday);
202 buf[5] = BIN2BCD(tm->tm_mday);
203 buf[6] = BIN2BCD(tm->tm_mon + 1);
204 buf[7] = BIN2BCD(tm->tm_year - 100);
205
206 if ((i2c_master_send(client, buf, 8)) != 8) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700207 dev_err(&client->dev, "%s: write error\n", __func__);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800208 return -EIO;
209 }
210
211 return 0;
212}
213
David Brownellcb26b572007-01-05 16:36:37 -0800214#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
215#define NEED_TRIM
216#endif
217
218#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
219#define NEED_TRIM
220#endif
221
222#ifdef NEED_TRIM
Alessandro Zummo7520b942006-03-27 01:16:45 -0800223static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
224{
Riku Voipioc6f24f92006-12-06 20:39:13 -0800225 struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
David Brownellcb26b572007-01-05 16:36:37 -0800226 u8 tmp = rs5c372->regs[RS5C372_REG_TRIM];
Alessandro Zummo7520b942006-03-27 01:16:45 -0800227
Alessandro Zummo7520b942006-03-27 01:16:45 -0800228 if (osc)
Riku Voipioc6f24f92006-12-06 20:39:13 -0800229 *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800230
Adrian Bunk17ad78e2006-11-25 11:09:29 -0800231 if (trim) {
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700232 dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp);
David Brownellcb26b572007-01-05 16:36:37 -0800233 tmp &= RS5C372_TRIM_MASK;
234 if (tmp & 0x3e) {
235 int t = tmp & 0x3f;
236
237 if (tmp & 0x40)
238 t = (~t | (s8)0xc0) + 1;
239 else
240 t = t - 1;
241
242 tmp = t * 2;
243 } else
244 tmp = 0;
245 *trim = tmp;
Adrian Bunk17ad78e2006-11-25 11:09:29 -0800246 }
Alessandro Zummo7520b942006-03-27 01:16:45 -0800247
248 return 0;
249}
David Brownellcb26b572007-01-05 16:36:37 -0800250#endif
Alessandro Zummo7520b942006-03-27 01:16:45 -0800251
252static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
253{
254 return rs5c372_get_datetime(to_i2c_client(dev), tm);
255}
256
257static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
258{
259 return rs5c372_set_datetime(to_i2c_client(dev), tm);
260}
261
David Brownellcb26b572007-01-05 16:36:37 -0800262#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
263
264static int
265rs5c_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
266{
267 struct i2c_client *client = to_i2c_client(dev);
268 struct rs5c372 *rs5c = i2c_get_clientdata(client);
269 unsigned char buf[2];
270 int status;
271
272 buf[1] = rs5c->regs[RS5C_REG_CTRL1];
273 switch (cmd) {
274 case RTC_UIE_OFF:
275 case RTC_UIE_ON:
276 /* some 327a modes use a different IRQ pin for 1Hz irqs */
277 if (rs5c->type == rtc_rs5c372a
278 && (buf[1] & RS5C372A_CTRL1_SL1))
279 return -ENOIOCTLCMD;
280 case RTC_AIE_OFF:
281 case RTC_AIE_ON:
282 /* these irq management calls only make sense for chips
283 * which are wired up to an IRQ.
284 */
285 if (!rs5c->has_irq)
286 return -ENOIOCTLCMD;
287 break;
288 default:
289 return -ENOIOCTLCMD;
290 }
291
292 status = rs5c_get_regs(rs5c);
293 if (status < 0)
294 return status;
295
296 buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
297 switch (cmd) {
298 case RTC_AIE_OFF: /* alarm off */
299 buf[1] &= ~RS5C_CTRL1_AALE;
300 break;
301 case RTC_AIE_ON: /* alarm on */
302 buf[1] |= RS5C_CTRL1_AALE;
303 break;
304 case RTC_UIE_OFF: /* update off */
305 buf[1] &= ~RS5C_CTRL1_CT_MASK;
306 break;
307 case RTC_UIE_ON: /* update on */
308 buf[1] &= ~RS5C_CTRL1_CT_MASK;
309 buf[1] |= RS5C_CTRL1_CT4;
310 break;
311 }
312 if ((i2c_master_send(client, buf, 2)) != 2) {
313 printk(KERN_WARNING "%s: can't update alarm\n",
314 rs5c->rtc->name);
315 status = -EIO;
316 } else
317 rs5c->regs[RS5C_REG_CTRL1] = buf[1];
318 return status;
319}
320
321#else
322#define rs5c_rtc_ioctl NULL
323#endif
324
325
326/* NOTE: Since RTC_WKALM_{RD,SET} were originally defined for EFI,
327 * which only exposes a polled programming interface; and since
328 * these calls map directly to those EFI requests; we don't demand
329 * we have an IRQ for this chip when we go through this API.
330 *
331 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
332 * though, managed through RTC_AIE_{ON,OFF} requests.
333 */
334
335static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
336{
337 struct i2c_client *client = to_i2c_client(dev);
338 struct rs5c372 *rs5c = i2c_get_clientdata(client);
339 int status;
340
341 status = rs5c_get_regs(rs5c);
342 if (status < 0)
343 return status;
344
345 /* report alarm time */
346 t->time.tm_sec = 0;
347 t->time.tm_min = BCD2BIN(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
348 t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
349 t->time.tm_mday = -1;
350 t->time.tm_mon = -1;
351 t->time.tm_year = -1;
352 t->time.tm_wday = -1;
353 t->time.tm_yday = -1;
354 t->time.tm_isdst = -1;
355
356 /* ... and status */
357 t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
358 t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);
359
360 return 0;
361}
362
363static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
364{
365 struct i2c_client *client = to_i2c_client(dev);
366 struct rs5c372 *rs5c = i2c_get_clientdata(client);
367 int status;
368 unsigned char buf[4];
369
370 /* only handle up to 24 hours in the future, like RTC_ALM_SET */
371 if (t->time.tm_mday != -1
372 || t->time.tm_mon != -1
373 || t->time.tm_year != -1)
374 return -EINVAL;
375
376 /* REVISIT: round up tm_sec */
377
378 /* if needed, disable irq (clears pending status) */
379 status = rs5c_get_regs(rs5c);
380 if (status < 0)
381 return status;
382 if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
383 buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
384 buf[1] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
385 if (i2c_master_send(client, buf, 2) != 2) {
386 pr_debug("%s: can't disable alarm\n", rs5c->rtc->name);
387 return -EIO;
388 }
389 rs5c->regs[RS5C_REG_CTRL1] = buf[1];
390 }
391
392 /* set alarm */
393 buf[0] = RS5C_ADDR(RS5C_REG_ALARM_A_MIN);
394 buf[1] = BIN2BCD(t->time.tm_min);
395 buf[2] = rs5c_hr2reg(rs5c, t->time.tm_hour);
396 buf[3] = 0x7f; /* any/all days */
397 if ((i2c_master_send(client, buf, 4)) != 4) {
398 pr_debug("%s: can't set alarm time\n", rs5c->rtc->name);
399 return -EIO;
400 }
401
402 /* ... and maybe enable its irq */
403 if (t->enabled) {
404 buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
405 buf[1] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
406 if ((i2c_master_send(client, buf, 2)) != 2)
407 printk(KERN_WARNING "%s: can't enable alarm\n",
408 rs5c->rtc->name);
409 rs5c->regs[RS5C_REG_CTRL1] = buf[1];
410 }
411
412 return 0;
413}
414
415#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
416
Alessandro Zummo7520b942006-03-27 01:16:45 -0800417static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
418{
419 int err, osc, trim;
420
Alessandro Zummoadfb4342006-04-10 22:54:43 -0700421 err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
422 if (err == 0) {
David Brownellcb26b572007-01-05 16:36:37 -0800423 seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
424 osc / 1000, osc % 1000);
425 seq_printf(seq, "trim\t\t: %d\n", trim);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800426 }
427
428 return 0;
429}
430
David Brownellcb26b572007-01-05 16:36:37 -0800431#else
432#define rs5c372_rtc_proc NULL
433#endif
434
David Brownellff8371a2006-09-30 23:28:17 -0700435static const struct rtc_class_ops rs5c372_rtc_ops = {
Alessandro Zummo7520b942006-03-27 01:16:45 -0800436 .proc = rs5c372_rtc_proc,
David Brownellcb26b572007-01-05 16:36:37 -0800437 .ioctl = rs5c_rtc_ioctl,
Alessandro Zummo7520b942006-03-27 01:16:45 -0800438 .read_time = rs5c372_rtc_read_time,
439 .set_time = rs5c372_rtc_set_time,
David Brownellcb26b572007-01-05 16:36:37 -0800440 .read_alarm = rs5c_read_alarm,
441 .set_alarm = rs5c_set_alarm,
Alessandro Zummo7520b942006-03-27 01:16:45 -0800442};
443
David Brownellcb26b572007-01-05 16:36:37 -0800444#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
445
Alessandro Zummo7520b942006-03-27 01:16:45 -0800446static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
447 struct device_attribute *attr, char *buf)
448{
Alessandro Zummo82896072006-04-10 22:54:44 -0700449 int err, trim;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800450
Alessandro Zummo82896072006-04-10 22:54:44 -0700451 err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
452 if (err)
453 return err;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800454
David Brownellcb26b572007-01-05 16:36:37 -0800455 return sprintf(buf, "%d\n", trim);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800456}
457static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);
458
459static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
460 struct device_attribute *attr, char *buf)
461{
Alessandro Zummo82896072006-04-10 22:54:44 -0700462 int err, osc;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800463
Alessandro Zummo82896072006-04-10 22:54:44 -0700464 err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
465 if (err)
466 return err;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800467
Alessandro Zummo82896072006-04-10 22:54:44 -0700468 return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800469}
470static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);
471
David Brownellcb26b572007-01-05 16:36:37 -0800472static int rs5c_sysfs_register(struct device *dev)
Alessandro Zummo7520b942006-03-27 01:16:45 -0800473{
David Brownellcb26b572007-01-05 16:36:37 -0800474 int err;
475
476 err = device_create_file(dev, &dev_attr_trim);
477 if (err)
478 return err;
479 err = device_create_file(dev, &dev_attr_osc);
480 if (err)
481 device_remove_file(dev, &dev_attr_trim);
482
483 return err;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800484}
485
David Brownelld8154612007-07-17 04:04:55 -0700486static void rs5c_sysfs_unregister(struct device *dev)
487{
488 device_remove_file(dev, &dev_attr_trim);
489 device_remove_file(dev, &dev_attr_osc);
490}
491
David Brownellcb26b572007-01-05 16:36:37 -0800492#else
493static int rs5c_sysfs_register(struct device *dev)
494{
495 return 0;
496}
David Brownelld8154612007-07-17 04:04:55 -0700497
498static void rs5c_sysfs_unregister(struct device *dev)
499{
500 /* nothing */
501}
David Brownellcb26b572007-01-05 16:36:37 -0800502#endif /* SYSFS */
503
504static struct i2c_driver rs5c372_driver;
505
Jean Delvared2653e92008-04-29 23:11:39 +0200506static int rs5c372_probe(struct i2c_client *client,
507 const struct i2c_device_id *id)
Alessandro Zummo7520b942006-03-27 01:16:45 -0800508{
509 int err = 0;
Riku Voipioc6f24f92006-12-06 20:39:13 -0800510 struct rs5c372 *rs5c372;
David Brownellcb26b572007-01-05 16:36:37 -0800511 struct rtc_time tm;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800512
Harvey Harrison2a4e2b82008-04-28 02:12:00 -0700513 dev_dbg(&client->dev, "%s\n", __func__);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800514
David Brownelld8154612007-07-17 04:04:55 -0700515 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
Alessandro Zummo7520b942006-03-27 01:16:45 -0800516 err = -ENODEV;
517 goto exit;
518 }
519
Riku Voipioc6f24f92006-12-06 20:39:13 -0800520 if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) {
Alessandro Zummo7520b942006-03-27 01:16:45 -0800521 err = -ENOMEM;
522 goto exit;
523 }
David Brownellcb26b572007-01-05 16:36:37 -0800524
David Brownellcb26b572007-01-05 16:36:37 -0800525 rs5c372->client = client;
Riku Voipioc6f24f92006-12-06 20:39:13 -0800526 i2c_set_clientdata(client, rs5c372);
Jean Delvare3760f732008-04-29 23:11:40 +0200527 rs5c372->type = id->driver_data;
Riku Voipioc6f24f92006-12-06 20:39:13 -0800528
Paul Mundte2bfe342008-04-28 02:11:57 -0700529 /* we read registers 0x0f then 0x00-0x0f; skip the first one */
530 rs5c372->regs = &rs5c372->buf[1];
531
David Brownellcb26b572007-01-05 16:36:37 -0800532 err = rs5c_get_regs(rs5c372);
533 if (err < 0)
David Brownelld8154612007-07-17 04:04:55 -0700534 goto exit_kfree;
David Brownellcb26b572007-01-05 16:36:37 -0800535
David Brownellcb26b572007-01-05 16:36:37 -0800536 /* clock may be set for am/pm or 24 hr time */
537 switch (rs5c372->type) {
538 case rtc_rs5c372a:
539 case rtc_rs5c372b:
540 /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
541 * so does periodic irq, except some 327a modes.
542 */
543 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
544 rs5c372->time24 = 1;
545 break;
546 case rtc_rv5c386:
547 case rtc_rv5c387a:
548 if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
549 rs5c372->time24 = 1;
550 /* alarm uses ALARM_W; and nINTRB for alarm and periodic
551 * irq, on both 386 and 387
552 */
553 break;
554 default:
555 dev_err(&client->dev, "unknown RTC type\n");
David Brownelld8154612007-07-17 04:04:55 -0700556 goto exit_kfree;
David Brownellcb26b572007-01-05 16:36:37 -0800557 }
558
559 /* if the oscillator lost power and no other software (like
560 * the bootloader) set it up, do it here.
561 */
562 if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP) {
563 unsigned char buf[3];
564
565 rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
566
567 buf[0] = RS5C_ADDR(RS5C_REG_CTRL1);
568 buf[1] = rs5c372->regs[RS5C_REG_CTRL1];
569 buf[2] = rs5c372->regs[RS5C_REG_CTRL2];
570
571 /* use 24hr mode */
572 switch (rs5c372->type) {
573 case rtc_rs5c372a:
574 case rtc_rs5c372b:
575 buf[2] |= RS5C372_CTRL2_24;
576 rs5c372->time24 = 1;
577 break;
578 case rtc_rv5c386:
579 case rtc_rv5c387a:
580 buf[1] |= RV5C387_CTRL1_24;
581 rs5c372->time24 = 1;
582 break;
583 default:
584 /* impossible */
585 break;
586 }
587
588 if ((i2c_master_send(client, buf, 3)) != 3) {
589 dev_err(&client->dev, "setup error\n");
David Brownelld8154612007-07-17 04:04:55 -0700590 goto exit_kfree;
David Brownellcb26b572007-01-05 16:36:37 -0800591 }
592 rs5c372->regs[RS5C_REG_CTRL1] = buf[1];
593 rs5c372->regs[RS5C_REG_CTRL2] = buf[2];
594 }
595
596 if (rs5c372_get_datetime(client, &tm) < 0)
597 dev_warn(&client->dev, "clock needs to be set\n");
598
599 dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
600 ({ char *s; switch (rs5c372->type) {
601 case rtc_rs5c372a: s = "rs5c372a"; break;
602 case rtc_rs5c372b: s = "rs5c372b"; break;
603 case rtc_rv5c386: s = "rv5c386"; break;
604 case rtc_rv5c387a: s = "rv5c387a"; break;
605 default: s = "chip"; break;
606 }; s;}),
607 rs5c372->time24 ? "24hr" : "am/pm"
608 );
609
David Brownelld8154612007-07-17 04:04:55 -0700610 /* REVISIT use client->irq to register alarm irq ... */
Alessandro Zummo7520b942006-03-27 01:16:45 -0800611
Riku Voipioc6f24f92006-12-06 20:39:13 -0800612 rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
613 &client->dev, &rs5c372_rtc_ops, THIS_MODULE);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800614
Riku Voipioc6f24f92006-12-06 20:39:13 -0800615 if (IS_ERR(rs5c372->rtc)) {
616 err = PTR_ERR(rs5c372->rtc);
David Brownelld8154612007-07-17 04:04:55 -0700617 goto exit_kfree;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800618 }
619
David Brownellcb26b572007-01-05 16:36:37 -0800620 err = rs5c_sysfs_register(&client->dev);
Riku Voipioc6f24f92006-12-06 20:39:13 -0800621 if (err)
622 goto exit_devreg;
Alessandro Zummo7520b942006-03-27 01:16:45 -0800623
624 return 0;
625
Jeff Garzik91046a82006-12-06 20:35:34 -0800626exit_devreg:
Riku Voipioc6f24f92006-12-06 20:39:13 -0800627 rtc_device_unregister(rs5c372->rtc);
Jeff Garzik91046a82006-12-06 20:35:34 -0800628
Alessandro Zummo7520b942006-03-27 01:16:45 -0800629exit_kfree:
Riku Voipioc6f24f92006-12-06 20:39:13 -0800630 kfree(rs5c372);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800631
632exit:
633 return err;
634}
635
David Brownelld8154612007-07-17 04:04:55 -0700636static int rs5c372_remove(struct i2c_client *client)
David Brownellcb26b572007-01-05 16:36:37 -0800637{
Riku Voipioc6f24f92006-12-06 20:39:13 -0800638 struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800639
David Brownelld8154612007-07-17 04:04:55 -0700640 rtc_device_unregister(rs5c372->rtc);
641 rs5c_sysfs_unregister(&client->dev);
Riku Voipioc6f24f92006-12-06 20:39:13 -0800642 kfree(rs5c372);
Alessandro Zummo7520b942006-03-27 01:16:45 -0800643 return 0;
644}
645
David Brownellcb26b572007-01-05 16:36:37 -0800646static struct i2c_driver rs5c372_driver = {
647 .driver = {
648 .name = "rtc-rs5c372",
649 },
David Brownelld8154612007-07-17 04:04:55 -0700650 .probe = rs5c372_probe,
651 .remove = rs5c372_remove,
Jean Delvare3760f732008-04-29 23:11:40 +0200652 .id_table = rs5c372_id,
David Brownellcb26b572007-01-05 16:36:37 -0800653};
654
Alessandro Zummo7520b942006-03-27 01:16:45 -0800655static __init int rs5c372_init(void)
656{
657 return i2c_add_driver(&rs5c372_driver);
658}
659
660static __exit void rs5c372_exit(void)
661{
662 i2c_del_driver(&rs5c372_driver);
663}
664
665module_init(rs5c372_init);
666module_exit(rs5c372_exit);
667
668MODULE_AUTHOR(
669 "Pavel Mironchik <pmironchik@optifacio.net>, "
670 "Alessandro Zummo <a.zummo@towertech.it>");
671MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
672MODULE_LICENSE("GPL");
673MODULE_VERSION(DRV_VERSION);