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17#include <linux/module.h>
18#include <linux/i2c.h>
19#include <linux/bcd.h>
20#include <linux/rtc.h>
21
22
23
24#define RV3029C2_ONOFF_CTRL 0x00
25#define RV3029C2_IRQ_CTRL 0x01
26#define RV3029C2_IRQ_CTRL_AIE (1 << 0)
27#define RV3029C2_IRQ_FLAGS 0x02
28#define RV3029C2_IRQ_FLAGS_AF (1 << 0)
29#define RV3029C2_STATUS 0x03
30#define RV3029C2_STATUS_VLOW1 (1 << 2)
31#define RV3029C2_STATUS_VLOW2 (1 << 3)
32#define RV3029C2_STATUS_SR (1 << 4)
33#define RV3029C2_STATUS_PON (1 << 5)
34#define RV3029C2_STATUS_EEBUSY (1 << 7)
35#define RV3029C2_RST_CTRL 0x04
36#define RV3029C2_CONTROL_SECTION_LEN 0x05
37
38
39#define RV3029C2_W_SEC 0x08
40#define RV3029C2_W_MINUTES 0x09
41#define RV3029C2_W_HOURS 0x0A
42#define RV3029C2_REG_HR_12_24 (1<<6)
43#define RV3029C2_REG_HR_PM (1<<5)
44#define RV3029C2_W_DATE 0x0B
45#define RV3029C2_W_DAYS 0x0C
46#define RV3029C2_W_MONTHS 0x0D
47#define RV3029C2_W_YEARS 0x0E
48#define RV3029C2_WATCH_SECTION_LEN 0x07
49
50
51#define RV3029C2_A_SC 0x10
52#define RV3029C2_A_MN 0x11
53#define RV3029C2_A_HR 0x12
54#define RV3029C2_A_DT 0x13
55#define RV3029C2_A_DW 0x14
56#define RV3029C2_A_MO 0x15
57#define RV3029C2_A_YR 0x16
58#define RV3029C2_ALARM_SECTION_LEN 0x07
59
60
61#define RV3029C2_TIMER_LOW 0x18
62#define RV3029C2_TIMER_HIGH 0x19
63
64
65#define RV3029C2_TEMP_PAGE 0x20
66
67
68#define RV3029C2_E2P_EEDATA1 0x28
69#define RV3029C2_E2P_EEDATA2 0x29
70
71
72#define RV3029C2_CONTROL_E2P_EECTRL 0x30
73#define RV3029C2_TRICKLE_1K (1<<0)
74#define RV3029C2_TRICKLE_5K (1<<1)
75#define RV3029C2_TRICKLE_20K (1<<2)
76#define RV3029C2_TRICKLE_80K (1<<3)
77#define RV3029C2_CONTROL_E2P_XTALOFFSET 0x31
78#define RV3029C2_CONTROL_E2P_QCOEF 0x32
79#define RV3029C2_CONTROL_E2P_TURNOVER 0x33
80
81
82#define RV3029C2_USR1_RAM_PAGE 0x38
83#define RV3029C2_USR1_SECTION_LEN 0x04
84#define RV3029C2_USR2_RAM_PAGE 0x3C
85#define RV3029C2_USR2_SECTION_LEN 0x04
86
87static int
88rv3029c2_i2c_read_regs(struct i2c_client *client, u8 reg, u8 *buf,
89 unsigned len)
90{
91 int ret;
92
93 if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
94 (reg + len > RV3029C2_USR1_RAM_PAGE + 8))
95 return -EINVAL;
96
97 ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf);
98 if (ret < 0)
99 return ret;
100 if (ret < len)
101 return -EIO;
102 return 0;
103}
104
105static int
106rv3029c2_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[],
107 unsigned len)
108{
109 if ((reg > RV3029C2_USR1_RAM_PAGE + 7) ||
110 (reg + len > RV3029C2_USR1_RAM_PAGE + 8))
111 return -EINVAL;
112
113 return i2c_smbus_write_i2c_block_data(client, reg, len, buf);
114}
115
116static int
117rv3029c2_i2c_get_sr(struct i2c_client *client, u8 *buf)
118{
119 int ret = rv3029c2_i2c_read_regs(client, RV3029C2_STATUS, buf, 1);
120
121 if (ret < 0)
122 return -EIO;
123 dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
124 return 0;
125}
126
127static int
128rv3029c2_i2c_set_sr(struct i2c_client *client, u8 val)
129{
130 u8 buf[1];
131 int sr;
132
133 buf[0] = val;
134 sr = rv3029c2_i2c_write_regs(client, RV3029C2_STATUS, buf, 1);
135 dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]);
136 if (sr < 0)
137 return -EIO;
138 return 0;
139}
140
141static int
142rv3029c2_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
143{
144 u8 buf[1];
145 int ret;
146 u8 regs[RV3029C2_WATCH_SECTION_LEN] = { 0, };
147
148 ret = rv3029c2_i2c_get_sr(client, buf);
149 if (ret < 0) {
150 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
151 return -EIO;
152 }
153
154 ret = rv3029c2_i2c_read_regs(client, RV3029C2_W_SEC , regs,
155 RV3029C2_WATCH_SECTION_LEN);
156 if (ret < 0) {
157 dev_err(&client->dev, "%s: reading RTC section failed\n",
158 __func__);
159 return ret;
160 }
161
162 tm->tm_sec = bcd2bin(regs[RV3029C2_W_SEC-RV3029C2_W_SEC]);
163 tm->tm_min = bcd2bin(regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC]);
164
165
166 {
167 const u8 _hr = regs[RV3029C2_W_HOURS-RV3029C2_W_SEC];
168 if (_hr & RV3029C2_REG_HR_12_24) {
169
170 tm->tm_hour = bcd2bin(_hr & 0x1f);
171 if (_hr & RV3029C2_REG_HR_PM)
172 tm->tm_hour += 12;
173 } else
174 tm->tm_hour = bcd2bin(_hr & 0x3f);
175 }
176
177 tm->tm_mday = bcd2bin(regs[RV3029C2_W_DATE-RV3029C2_W_SEC]);
178 tm->tm_mon = bcd2bin(regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC]) - 1;
179 tm->tm_year = bcd2bin(regs[RV3029C2_W_YEARS-RV3029C2_W_SEC]) + 100;
180 tm->tm_wday = bcd2bin(regs[RV3029C2_W_DAYS-RV3029C2_W_SEC]) - 1;
181
182 return 0;
183}
184
185static int rv3029c2_rtc_read_time(struct device *dev, struct rtc_time *tm)
186{
187 return rv3029c2_i2c_read_time(to_i2c_client(dev), tm);
188}
189
190static int
191rv3029c2_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
192{
193 struct rtc_time *const tm = &alarm->time;
194 int ret;
195 u8 regs[8];
196
197 ret = rv3029c2_i2c_get_sr(client, regs);
198 if (ret < 0) {
199 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
200 return -EIO;
201 }
202
203 ret = rv3029c2_i2c_read_regs(client, RV3029C2_A_SC, regs,
204 RV3029C2_ALARM_SECTION_LEN);
205
206 if (ret < 0) {
207 dev_err(&client->dev, "%s: reading alarm section failed\n",
208 __func__);
209 return ret;
210 }
211
212 tm->tm_sec = bcd2bin(regs[RV3029C2_A_SC-RV3029C2_A_SC] & 0x7f);
213 tm->tm_min = bcd2bin(regs[RV3029C2_A_MN-RV3029C2_A_SC] & 0x7f);
214 tm->tm_hour = bcd2bin(regs[RV3029C2_A_HR-RV3029C2_A_SC] & 0x3f);
215 tm->tm_mday = bcd2bin(regs[RV3029C2_A_DT-RV3029C2_A_SC] & 0x3f);
216 tm->tm_mon = bcd2bin(regs[RV3029C2_A_MO-RV3029C2_A_SC] & 0x1f) - 1;
217 tm->tm_year = bcd2bin(regs[RV3029C2_A_YR-RV3029C2_A_SC] & 0x7f) + 100;
218 tm->tm_wday = bcd2bin(regs[RV3029C2_A_DW-RV3029C2_A_SC] & 0x07) - 1;
219
220 return 0;
221}
222
223static int
224rv3029c2_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
225{
226 return rv3029c2_i2c_read_alarm(to_i2c_client(dev), alarm);
227}
228
229static int rv3029c2_rtc_i2c_alarm_set_irq(struct i2c_client *client,
230 int enable)
231{
232 int ret;
233 u8 buf[1];
234
235
236 ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
237 if (ret < 0) {
238 dev_err(&client->dev, "can't read INT reg\n");
239 return ret;
240 }
241 if (enable)
242 buf[0] |= RV3029C2_IRQ_CTRL_AIE;
243 else
244 buf[0] &= ~RV3029C2_IRQ_CTRL_AIE;
245
246 ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_CTRL, buf, 1);
247 if (ret < 0) {
248 dev_err(&client->dev, "can't set INT reg\n");
249 return ret;
250 }
251
252 return 0;
253}
254
255static int rv3029c2_rtc_i2c_set_alarm(struct i2c_client *client,
256 struct rtc_wkalrm *alarm)
257{
258 struct rtc_time *const tm = &alarm->time;
259 int ret;
260 u8 regs[8];
261
262
263
264
265
266
267 if (tm->tm_year < 100)
268 return -EINVAL;
269
270 ret = rv3029c2_i2c_get_sr(client, regs);
271 if (ret < 0) {
272 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
273 return -EIO;
274 }
275 regs[RV3029C2_A_SC-RV3029C2_A_SC] = bin2bcd(tm->tm_sec & 0x7f);
276 regs[RV3029C2_A_MN-RV3029C2_A_SC] = bin2bcd(tm->tm_min & 0x7f);
277 regs[RV3029C2_A_HR-RV3029C2_A_SC] = bin2bcd(tm->tm_hour & 0x3f);
278 regs[RV3029C2_A_DT-RV3029C2_A_SC] = bin2bcd(tm->tm_mday & 0x3f);
279 regs[RV3029C2_A_MO-RV3029C2_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1);
280 regs[RV3029C2_A_DW-RV3029C2_A_SC] = bin2bcd((tm->tm_wday & 7) - 1);
281 regs[RV3029C2_A_YR-RV3029C2_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100);
282
283 ret = rv3029c2_i2c_write_regs(client, RV3029C2_A_SC, regs,
284 RV3029C2_ALARM_SECTION_LEN);
285 if (ret < 0)
286 return ret;
287
288 if (alarm->enabled) {
289 u8 buf[1];
290
291
292 ret = rv3029c2_i2c_read_regs(client, RV3029C2_IRQ_FLAGS,
293 buf, 1);
294 if (ret < 0) {
295 dev_err(&client->dev, "can't read alarm flag\n");
296 return ret;
297 }
298 buf[0] &= ~RV3029C2_IRQ_FLAGS_AF;
299 ret = rv3029c2_i2c_write_regs(client, RV3029C2_IRQ_FLAGS,
300 buf, 1);
301 if (ret < 0) {
302 dev_err(&client->dev, "can't set alarm flag\n");
303 return ret;
304 }
305
306 ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 1);
307 if (ret)
308 return ret;
309
310 dev_dbg(&client->dev, "alarm IRQ armed\n");
311 } else {
312
313 ret = rv3029c2_rtc_i2c_alarm_set_irq(client, 0);
314 if (ret)
315 return ret;
316
317 dev_dbg(&client->dev, "alarm IRQ disabled\n");
318 }
319
320 return 0;
321}
322
323static int rv3029c2_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
324{
325 return rv3029c2_rtc_i2c_set_alarm(to_i2c_client(dev), alarm);
326}
327
328static int
329rv3029c2_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
330{
331 u8 regs[8];
332 int ret;
333
334
335
336
337
338
339 if (tm->tm_year < 100)
340 return -EINVAL;
341
342 regs[RV3029C2_W_SEC-RV3029C2_W_SEC] = bin2bcd(tm->tm_sec);
343 regs[RV3029C2_W_MINUTES-RV3029C2_W_SEC] = bin2bcd(tm->tm_min);
344 regs[RV3029C2_W_HOURS-RV3029C2_W_SEC] = bin2bcd(tm->tm_hour);
345 regs[RV3029C2_W_DATE-RV3029C2_W_SEC] = bin2bcd(tm->tm_mday);
346 regs[RV3029C2_W_MONTHS-RV3029C2_W_SEC] = bin2bcd(tm->tm_mon+1);
347 regs[RV3029C2_W_DAYS-RV3029C2_W_SEC] = bin2bcd((tm->tm_wday & 7)+1);
348 regs[RV3029C2_W_YEARS-RV3029C2_W_SEC] = bin2bcd(tm->tm_year - 100);
349
350 ret = rv3029c2_i2c_write_regs(client, RV3029C2_W_SEC, regs,
351 RV3029C2_WATCH_SECTION_LEN);
352 if (ret < 0)
353 return ret;
354
355 ret = rv3029c2_i2c_get_sr(client, regs);
356 if (ret < 0) {
357 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
358 return ret;
359 }
360
361 ret = rv3029c2_i2c_set_sr(client, (regs[0] & ~RV3029C2_STATUS_PON));
362 if (ret < 0) {
363 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
364 return ret;
365 }
366
367 return 0;
368}
369
370static int rv3029c2_rtc_set_time(struct device *dev, struct rtc_time *tm)
371{
372 return rv3029c2_i2c_set_time(to_i2c_client(dev), tm);
373}
374
375static const struct rtc_class_ops rv3029c2_rtc_ops = {
376 .read_time = rv3029c2_rtc_read_time,
377 .set_time = rv3029c2_rtc_set_time,
378 .read_alarm = rv3029c2_rtc_read_alarm,
379 .set_alarm = rv3029c2_rtc_set_alarm,
380};
381
382static struct i2c_device_id rv3029c2_id[] = {
383 { "rv3029c2", 0 },
384 { }
385};
386MODULE_DEVICE_TABLE(i2c, rv3029c2_id);
387
388static int rv3029c2_probe(struct i2c_client *client,
389 const struct i2c_device_id *id)
390{
391 struct rtc_device *rtc;
392 int rc = 0;
393 u8 buf[1];
394
395 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL))
396 return -ENODEV;
397
398 rc = rv3029c2_i2c_get_sr(client, buf);
399 if (rc < 0) {
400 dev_err(&client->dev, "reading status failed\n");
401 return rc;
402 }
403
404 rtc = devm_rtc_device_register(&client->dev, client->name,
405 &rv3029c2_rtc_ops, THIS_MODULE);
406
407 if (IS_ERR(rtc))
408 return PTR_ERR(rtc);
409
410 i2c_set_clientdata(client, rtc);
411
412 return 0;
413}
414
415static struct i2c_driver rv3029c2_driver = {
416 .driver = {
417 .name = "rtc-rv3029c2",
418 },
419 .probe = rv3029c2_probe,
420 .id_table = rv3029c2_id,
421};
422
423module_i2c_driver(rv3029c2_driver);
424
425MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>");
426MODULE_DESCRIPTION("Micro Crystal RV3029C2 RTC driver");
427MODULE_LICENSE("GPL");
428
