Commit | Line | Data |
---|---|---|
52365230 | 1 | /* |
aba39d27 | 2 | * Micro Crystal RV-3029 rtc class driver |
52365230 HS |
3 | * |
4 | * Author: Gregory Hermant <gregory.hermant@calao-systems.com> | |
2dca3d9e | 5 | * Michael Buesch <m@bues.ch> |
52365230 HS |
6 | * |
7 | * based on previously existing rtc class drivers | |
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 | * | |
52365230 HS |
13 | */ |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/bcd.h> | |
18 | #include <linux/rtc.h> | |
a7f6e287 MB |
19 | #include <linux/delay.h> |
20 | #include <linux/of.h> | |
a696b31e MB |
21 | #include <linux/hwmon.h> |
22 | #include <linux/hwmon-sysfs.h> | |
a7f6e287 | 23 | |
52365230 HS |
24 | |
25 | /* Register map */ | |
26 | /* control section */ | |
aba39d27 | 27 | #define RV3029_ONOFF_CTRL 0x00 |
7697de35 MB |
28 | #define RV3029_ONOFF_CTRL_WE BIT(0) |
29 | #define RV3029_ONOFF_CTRL_TE BIT(1) | |
30 | #define RV3029_ONOFF_CTRL_TAR BIT(2) | |
31 | #define RV3029_ONOFF_CTRL_EERE BIT(3) | |
32 | #define RV3029_ONOFF_CTRL_SRON BIT(4) | |
33 | #define RV3029_ONOFF_CTRL_TD0 BIT(5) | |
34 | #define RV3029_ONOFF_CTRL_TD1 BIT(6) | |
35 | #define RV3029_ONOFF_CTRL_CLKINT BIT(7) | |
aba39d27 | 36 | #define RV3029_IRQ_CTRL 0x01 |
7697de35 MB |
37 | #define RV3029_IRQ_CTRL_AIE BIT(0) |
38 | #define RV3029_IRQ_CTRL_TIE BIT(1) | |
39 | #define RV3029_IRQ_CTRL_V1IE BIT(2) | |
40 | #define RV3029_IRQ_CTRL_V2IE BIT(3) | |
41 | #define RV3029_IRQ_CTRL_SRIE BIT(4) | |
aba39d27 | 42 | #define RV3029_IRQ_FLAGS 0x02 |
7697de35 MB |
43 | #define RV3029_IRQ_FLAGS_AF BIT(0) |
44 | #define RV3029_IRQ_FLAGS_TF BIT(1) | |
45 | #define RV3029_IRQ_FLAGS_V1IF BIT(2) | |
46 | #define RV3029_IRQ_FLAGS_V2IF BIT(3) | |
47 | #define RV3029_IRQ_FLAGS_SRF BIT(4) | |
aba39d27 | 48 | #define RV3029_STATUS 0x03 |
7697de35 MB |
49 | #define RV3029_STATUS_VLOW1 BIT(2) |
50 | #define RV3029_STATUS_VLOW2 BIT(3) | |
51 | #define RV3029_STATUS_SR BIT(4) | |
52 | #define RV3029_STATUS_PON BIT(5) | |
53 | #define RV3029_STATUS_EEBUSY BIT(7) | |
aba39d27 | 54 | #define RV3029_RST_CTRL 0x04 |
7697de35 | 55 | #define RV3029_RST_CTRL_SYSR BIT(4) |
aba39d27 | 56 | #define RV3029_CONTROL_SECTION_LEN 0x05 |
52365230 HS |
57 | |
58 | /* watch section */ | |
aba39d27 MB |
59 | #define RV3029_W_SEC 0x08 |
60 | #define RV3029_W_MINUTES 0x09 | |
61 | #define RV3029_W_HOURS 0x0A | |
7697de35 MB |
62 | #define RV3029_REG_HR_12_24 BIT(6) /* 24h/12h mode */ |
63 | #define RV3029_REG_HR_PM BIT(5) /* PM/AM bit in 12h mode */ | |
aba39d27 MB |
64 | #define RV3029_W_DATE 0x0B |
65 | #define RV3029_W_DAYS 0x0C | |
66 | #define RV3029_W_MONTHS 0x0D | |
67 | #define RV3029_W_YEARS 0x0E | |
68 | #define RV3029_WATCH_SECTION_LEN 0x07 | |
52365230 HS |
69 | |
70 | /* alarm section */ | |
aba39d27 MB |
71 | #define RV3029_A_SC 0x10 |
72 | #define RV3029_A_MN 0x11 | |
73 | #define RV3029_A_HR 0x12 | |
74 | #define RV3029_A_DT 0x13 | |
75 | #define RV3029_A_DW 0x14 | |
76 | #define RV3029_A_MO 0x15 | |
77 | #define RV3029_A_YR 0x16 | |
78 | #define RV3029_ALARM_SECTION_LEN 0x07 | |
52365230 HS |
79 | |
80 | /* timer section */ | |
aba39d27 MB |
81 | #define RV3029_TIMER_LOW 0x18 |
82 | #define RV3029_TIMER_HIGH 0x19 | |
52365230 HS |
83 | |
84 | /* temperature section */ | |
aba39d27 | 85 | #define RV3029_TEMP_PAGE 0x20 |
52365230 HS |
86 | |
87 | /* eeprom data section */ | |
aba39d27 MB |
88 | #define RV3029_E2P_EEDATA1 0x28 |
89 | #define RV3029_E2P_EEDATA2 0x29 | |
7697de35 | 90 | #define RV3029_E2PDATA_SECTION_LEN 0x02 |
52365230 HS |
91 | |
92 | /* eeprom control section */ | |
aba39d27 | 93 | #define RV3029_CONTROL_E2P_EECTRL 0x30 |
7697de35 MB |
94 | #define RV3029_EECTRL_THP BIT(0) /* temp scan interval */ |
95 | #define RV3029_EECTRL_THE BIT(1) /* thermometer enable */ | |
96 | #define RV3029_EECTRL_FD0 BIT(2) /* CLKOUT */ | |
97 | #define RV3029_EECTRL_FD1 BIT(3) /* CLKOUT */ | |
98 | #define RV3029_TRICKLE_1K BIT(4) /* 1.5K resistance */ | |
99 | #define RV3029_TRICKLE_5K BIT(5) /* 5K resistance */ | |
100 | #define RV3029_TRICKLE_20K BIT(6) /* 20K resistance */ | |
101 | #define RV3029_TRICKLE_80K BIT(7) /* 80K resistance */ | |
102 | #define RV3029_TRICKLE_MASK (RV3029_TRICKLE_1K |\ | |
103 | RV3029_TRICKLE_5K |\ | |
104 | RV3029_TRICKLE_20K |\ | |
105 | RV3029_TRICKLE_80K) | |
106 | #define RV3029_TRICKLE_SHIFT 4 | |
107 | #define RV3029_CONTROL_E2P_XOFFS 0x31 /* XTAL offset */ | |
108 | #define RV3029_CONTROL_E2P_XOFFS_SIGN BIT(7) /* Sign: 1->pos, 0->neg */ | |
109 | #define RV3029_CONTROL_E2P_QCOEF 0x32 /* XTAL temp drift coef */ | |
110 | #define RV3029_CONTROL_E2P_TURNOVER 0x33 /* XTAL turnover temp (in *C) */ | |
111 | #define RV3029_CONTROL_E2P_TOV_MASK 0x3F /* XTAL turnover temp mask */ | |
52365230 HS |
112 | |
113 | /* user ram section */ | |
aba39d27 MB |
114 | #define RV3029_USR1_RAM_PAGE 0x38 |
115 | #define RV3029_USR1_SECTION_LEN 0x04 | |
116 | #define RV3029_USR2_RAM_PAGE 0x3C | |
117 | #define RV3029_USR2_SECTION_LEN 0x04 | |
52365230 HS |
118 | |
119 | static int | |
aba39d27 MB |
120 | rv3029_i2c_read_regs(struct i2c_client *client, u8 reg, u8 *buf, |
121 | unsigned len) | |
52365230 HS |
122 | { |
123 | int ret; | |
124 | ||
aba39d27 MB |
125 | if ((reg > RV3029_USR1_RAM_PAGE + 7) || |
126 | (reg + len > RV3029_USR1_RAM_PAGE + 8)) | |
52365230 HS |
127 | return -EINVAL; |
128 | ||
129 | ret = i2c_smbus_read_i2c_block_data(client, reg, len, buf); | |
130 | if (ret < 0) | |
131 | return ret; | |
132 | if (ret < len) | |
133 | return -EIO; | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static int | |
aba39d27 MB |
138 | rv3029_i2c_write_regs(struct i2c_client *client, u8 reg, u8 const buf[], |
139 | unsigned len) | |
52365230 | 140 | { |
aba39d27 MB |
141 | if ((reg > RV3029_USR1_RAM_PAGE + 7) || |
142 | (reg + len > RV3029_USR1_RAM_PAGE + 8)) | |
52365230 HS |
143 | return -EINVAL; |
144 | ||
145 | return i2c_smbus_write_i2c_block_data(client, reg, len, buf); | |
146 | } | |
147 | ||
2dca3d9e MB |
148 | static int |
149 | rv3029_i2c_update_bits(struct i2c_client *client, u8 reg, u8 mask, u8 set) | |
150 | { | |
151 | u8 buf; | |
152 | int ret; | |
153 | ||
154 | ret = rv3029_i2c_read_regs(client, reg, &buf, 1); | |
155 | if (ret < 0) | |
156 | return ret; | |
157 | buf &= ~mask; | |
158 | buf |= set & mask; | |
159 | ret = rv3029_i2c_write_regs(client, reg, &buf, 1); | |
160 | if (ret < 0) | |
161 | return ret; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
52365230 | 166 | static int |
aba39d27 | 167 | rv3029_i2c_get_sr(struct i2c_client *client, u8 *buf) |
52365230 | 168 | { |
aba39d27 | 169 | int ret = rv3029_i2c_read_regs(client, RV3029_STATUS, buf, 1); |
52365230 HS |
170 | |
171 | if (ret < 0) | |
172 | return -EIO; | |
173 | dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | static int | |
aba39d27 | 178 | rv3029_i2c_set_sr(struct i2c_client *client, u8 val) |
52365230 HS |
179 | { |
180 | u8 buf[1]; | |
181 | int sr; | |
182 | ||
183 | buf[0] = val; | |
aba39d27 | 184 | sr = rv3029_i2c_write_regs(client, RV3029_STATUS, buf, 1); |
52365230 HS |
185 | dev_dbg(&client->dev, "status = 0x%.2x (%d)\n", buf[0], buf[0]); |
186 | if (sr < 0) | |
187 | return -EIO; | |
188 | return 0; | |
189 | } | |
190 | ||
a7f6e287 MB |
191 | static int rv3029_eeprom_busywait(struct i2c_client *client) |
192 | { | |
193 | int i, ret; | |
194 | u8 sr; | |
195 | ||
196 | for (i = 100; i > 0; i--) { | |
197 | ret = rv3029_i2c_get_sr(client, &sr); | |
198 | if (ret < 0) | |
199 | break; | |
200 | if (!(sr & RV3029_STATUS_EEBUSY)) | |
201 | break; | |
202 | usleep_range(1000, 10000); | |
203 | } | |
204 | if (i <= 0) { | |
205 | dev_err(&client->dev, "EEPROM busy wait timeout.\n"); | |
206 | return -ETIMEDOUT; | |
207 | } | |
208 | ||
209 | return ret; | |
210 | } | |
211 | ||
212 | static int rv3029_eeprom_exit(struct i2c_client *client) | |
213 | { | |
214 | /* Re-enable eeprom refresh */ | |
215 | return rv3029_i2c_update_bits(client, RV3029_ONOFF_CTRL, | |
216 | RV3029_ONOFF_CTRL_EERE, | |
217 | RV3029_ONOFF_CTRL_EERE); | |
218 | } | |
219 | ||
220 | static int rv3029_eeprom_enter(struct i2c_client *client) | |
221 | { | |
222 | int ret; | |
223 | u8 sr; | |
224 | ||
225 | /* Check whether we are in the allowed voltage range. */ | |
226 | ret = rv3029_i2c_get_sr(client, &sr); | |
227 | if (ret < 0) | |
228 | return ret; | |
229 | if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) { | |
230 | /* We clear the bits and retry once just in case | |
231 | * we had a brown out in early startup. | |
232 | */ | |
233 | sr &= ~RV3029_STATUS_VLOW1; | |
234 | sr &= ~RV3029_STATUS_VLOW2; | |
235 | ret = rv3029_i2c_set_sr(client, sr); | |
236 | if (ret < 0) | |
237 | return ret; | |
238 | usleep_range(1000, 10000); | |
239 | ret = rv3029_i2c_get_sr(client, &sr); | |
240 | if (ret < 0) | |
241 | return ret; | |
242 | if (sr & (RV3029_STATUS_VLOW1 | RV3029_STATUS_VLOW2)) { | |
243 | dev_err(&client->dev, | |
244 | "Supply voltage is too low to safely access the EEPROM.\n"); | |
245 | return -ENODEV; | |
246 | } | |
247 | } | |
248 | ||
249 | /* Disable eeprom refresh. */ | |
250 | ret = rv3029_i2c_update_bits(client, RV3029_ONOFF_CTRL, | |
251 | RV3029_ONOFF_CTRL_EERE, 0); | |
252 | if (ret < 0) | |
253 | return ret; | |
254 | ||
255 | /* Wait for any previous eeprom accesses to finish. */ | |
256 | ret = rv3029_eeprom_busywait(client); | |
257 | if (ret < 0) | |
258 | rv3029_eeprom_exit(client); | |
259 | ||
260 | return ret; | |
261 | } | |
262 | ||
263 | static int rv3029_eeprom_read(struct i2c_client *client, u8 reg, | |
264 | u8 buf[], size_t len) | |
265 | { | |
266 | int ret, err; | |
267 | ||
268 | err = rv3029_eeprom_enter(client); | |
269 | if (err < 0) | |
270 | return err; | |
271 | ||
272 | ret = rv3029_i2c_read_regs(client, reg, buf, len); | |
273 | ||
274 | err = rv3029_eeprom_exit(client); | |
275 | if (err < 0) | |
276 | return err; | |
277 | ||
278 | return ret; | |
279 | } | |
280 | ||
281 | static int rv3029_eeprom_write(struct i2c_client *client, u8 reg, | |
282 | u8 const buf[], size_t len) | |
283 | { | |
284 | int ret, err; | |
285 | size_t i; | |
286 | u8 tmp; | |
287 | ||
288 | err = rv3029_eeprom_enter(client); | |
289 | if (err < 0) | |
290 | return err; | |
291 | ||
292 | for (i = 0; i < len; i++, reg++) { | |
293 | ret = rv3029_i2c_read_regs(client, reg, &tmp, 1); | |
294 | if (ret < 0) | |
295 | break; | |
296 | if (tmp != buf[i]) { | |
297 | ret = rv3029_i2c_write_regs(client, reg, &buf[i], 1); | |
298 | if (ret < 0) | |
299 | break; | |
300 | } | |
301 | ret = rv3029_eeprom_busywait(client); | |
302 | if (ret < 0) | |
303 | break; | |
304 | } | |
305 | ||
306 | err = rv3029_eeprom_exit(client); | |
307 | if (err < 0) | |
308 | return err; | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
39387dc2 MB |
313 | static int rv3029_eeprom_update_bits(struct i2c_client *client, |
314 | u8 reg, u8 mask, u8 set) | |
315 | { | |
316 | u8 buf; | |
317 | int ret; | |
318 | ||
319 | ret = rv3029_eeprom_read(client, reg, &buf, 1); | |
320 | if (ret < 0) | |
321 | return ret; | |
322 | buf &= ~mask; | |
323 | buf |= set & mask; | |
324 | ret = rv3029_eeprom_write(client, reg, &buf, 1); | |
325 | if (ret < 0) | |
326 | return ret; | |
327 | ||
328 | return 0; | |
329 | } | |
330 | ||
52365230 | 331 | static int |
aba39d27 | 332 | rv3029_i2c_read_time(struct i2c_client *client, struct rtc_time *tm) |
52365230 HS |
333 | { |
334 | u8 buf[1]; | |
335 | int ret; | |
aba39d27 | 336 | u8 regs[RV3029_WATCH_SECTION_LEN] = { 0, }; |
52365230 | 337 | |
aba39d27 | 338 | ret = rv3029_i2c_get_sr(client, buf); |
52365230 HS |
339 | if (ret < 0) { |
340 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); | |
341 | return -EIO; | |
342 | } | |
343 | ||
aba39d27 MB |
344 | ret = rv3029_i2c_read_regs(client, RV3029_W_SEC, regs, |
345 | RV3029_WATCH_SECTION_LEN); | |
52365230 HS |
346 | if (ret < 0) { |
347 | dev_err(&client->dev, "%s: reading RTC section failed\n", | |
348 | __func__); | |
349 | return ret; | |
350 | } | |
351 | ||
aba39d27 MB |
352 | tm->tm_sec = bcd2bin(regs[RV3029_W_SEC-RV3029_W_SEC]); |
353 | tm->tm_min = bcd2bin(regs[RV3029_W_MINUTES-RV3029_W_SEC]); | |
52365230 HS |
354 | |
355 | /* HR field has a more complex interpretation */ | |
356 | { | |
aba39d27 MB |
357 | const u8 _hr = regs[RV3029_W_HOURS-RV3029_W_SEC]; |
358 | ||
359 | if (_hr & RV3029_REG_HR_12_24) { | |
52365230 HS |
360 | /* 12h format */ |
361 | tm->tm_hour = bcd2bin(_hr & 0x1f); | |
aba39d27 | 362 | if (_hr & RV3029_REG_HR_PM) /* PM flag set */ |
52365230 HS |
363 | tm->tm_hour += 12; |
364 | } else /* 24h format */ | |
365 | tm->tm_hour = bcd2bin(_hr & 0x3f); | |
366 | } | |
367 | ||
aba39d27 MB |
368 | tm->tm_mday = bcd2bin(regs[RV3029_W_DATE-RV3029_W_SEC]); |
369 | tm->tm_mon = bcd2bin(regs[RV3029_W_MONTHS-RV3029_W_SEC]) - 1; | |
370 | tm->tm_year = bcd2bin(regs[RV3029_W_YEARS-RV3029_W_SEC]) + 100; | |
371 | tm->tm_wday = bcd2bin(regs[RV3029_W_DAYS-RV3029_W_SEC]) - 1; | |
52365230 HS |
372 | |
373 | return 0; | |
374 | } | |
375 | ||
aba39d27 | 376 | static int rv3029_rtc_read_time(struct device *dev, struct rtc_time *tm) |
52365230 | 377 | { |
aba39d27 | 378 | return rv3029_i2c_read_time(to_i2c_client(dev), tm); |
52365230 HS |
379 | } |
380 | ||
381 | static int | |
aba39d27 | 382 | rv3029_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm) |
52365230 HS |
383 | { |
384 | struct rtc_time *const tm = &alarm->time; | |
385 | int ret; | |
386 | u8 regs[8]; | |
387 | ||
aba39d27 | 388 | ret = rv3029_i2c_get_sr(client, regs); |
52365230 HS |
389 | if (ret < 0) { |
390 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); | |
391 | return -EIO; | |
392 | } | |
393 | ||
aba39d27 MB |
394 | ret = rv3029_i2c_read_regs(client, RV3029_A_SC, regs, |
395 | RV3029_ALARM_SECTION_LEN); | |
52365230 HS |
396 | |
397 | if (ret < 0) { | |
398 | dev_err(&client->dev, "%s: reading alarm section failed\n", | |
399 | __func__); | |
400 | return ret; | |
401 | } | |
402 | ||
aba39d27 MB |
403 | tm->tm_sec = bcd2bin(regs[RV3029_A_SC-RV3029_A_SC] & 0x7f); |
404 | tm->tm_min = bcd2bin(regs[RV3029_A_MN-RV3029_A_SC] & 0x7f); | |
405 | tm->tm_hour = bcd2bin(regs[RV3029_A_HR-RV3029_A_SC] & 0x3f); | |
406 | tm->tm_mday = bcd2bin(regs[RV3029_A_DT-RV3029_A_SC] & 0x3f); | |
407 | tm->tm_mon = bcd2bin(regs[RV3029_A_MO-RV3029_A_SC] & 0x1f) - 1; | |
408 | tm->tm_year = bcd2bin(regs[RV3029_A_YR-RV3029_A_SC] & 0x7f) + 100; | |
409 | tm->tm_wday = bcd2bin(regs[RV3029_A_DW-RV3029_A_SC] & 0x07) - 1; | |
52365230 HS |
410 | |
411 | return 0; | |
412 | } | |
413 | ||
414 | static int | |
aba39d27 | 415 | rv3029_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
52365230 | 416 | { |
aba39d27 | 417 | return rv3029_i2c_read_alarm(to_i2c_client(dev), alarm); |
52365230 HS |
418 | } |
419 | ||
aba39d27 | 420 | static int rv3029_rtc_i2c_alarm_set_irq(struct i2c_client *client, |
52365230 HS |
421 | int enable) |
422 | { | |
423 | int ret; | |
52365230 | 424 | |
2dca3d9e MB |
425 | /* enable/disable AIE irq */ |
426 | ret = rv3029_i2c_update_bits(client, RV3029_IRQ_CTRL, | |
427 | RV3029_IRQ_CTRL_AIE, | |
428 | (enable ? RV3029_IRQ_CTRL_AIE : 0)); | |
52365230 | 429 | if (ret < 0) { |
2dca3d9e | 430 | dev_err(&client->dev, "can't update INT reg\n"); |
52365230 HS |
431 | return ret; |
432 | } | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
aba39d27 MB |
437 | static int rv3029_rtc_i2c_set_alarm(struct i2c_client *client, |
438 | struct rtc_wkalrm *alarm) | |
52365230 HS |
439 | { |
440 | struct rtc_time *const tm = &alarm->time; | |
441 | int ret; | |
442 | u8 regs[8]; | |
443 | ||
444 | /* | |
445 | * The clock has an 8 bit wide bcd-coded register (they never learn) | |
446 | * for the year. tm_year is an offset from 1900 and we are interested | |
447 | * in the 2000-2099 range, so any value less than 100 is invalid. | |
448 | */ | |
449 | if (tm->tm_year < 100) | |
450 | return -EINVAL; | |
451 | ||
aba39d27 | 452 | ret = rv3029_i2c_get_sr(client, regs); |
52365230 HS |
453 | if (ret < 0) { |
454 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); | |
455 | return -EIO; | |
456 | } | |
aba39d27 MB |
457 | regs[RV3029_A_SC-RV3029_A_SC] = bin2bcd(tm->tm_sec & 0x7f); |
458 | regs[RV3029_A_MN-RV3029_A_SC] = bin2bcd(tm->tm_min & 0x7f); | |
459 | regs[RV3029_A_HR-RV3029_A_SC] = bin2bcd(tm->tm_hour & 0x3f); | |
460 | regs[RV3029_A_DT-RV3029_A_SC] = bin2bcd(tm->tm_mday & 0x3f); | |
461 | regs[RV3029_A_MO-RV3029_A_SC] = bin2bcd((tm->tm_mon & 0x1f) - 1); | |
462 | regs[RV3029_A_DW-RV3029_A_SC] = bin2bcd((tm->tm_wday & 7) - 1); | |
463 | regs[RV3029_A_YR-RV3029_A_SC] = bin2bcd((tm->tm_year & 0x7f) - 100); | |
464 | ||
465 | ret = rv3029_i2c_write_regs(client, RV3029_A_SC, regs, | |
466 | RV3029_ALARM_SECTION_LEN); | |
52365230 HS |
467 | if (ret < 0) |
468 | return ret; | |
469 | ||
470 | if (alarm->enabled) { | |
52365230 | 471 | /* clear AF flag */ |
2dca3d9e MB |
472 | ret = rv3029_i2c_update_bits(client, RV3029_IRQ_FLAGS, |
473 | RV3029_IRQ_FLAGS_AF, 0); | |
52365230 | 474 | if (ret < 0) { |
2dca3d9e | 475 | dev_err(&client->dev, "can't clear alarm flag\n"); |
52365230 HS |
476 | return ret; |
477 | } | |
478 | /* enable AIE irq */ | |
aba39d27 | 479 | ret = rv3029_rtc_i2c_alarm_set_irq(client, 1); |
52365230 HS |
480 | if (ret) |
481 | return ret; | |
482 | ||
483 | dev_dbg(&client->dev, "alarm IRQ armed\n"); | |
484 | } else { | |
485 | /* disable AIE irq */ | |
aba39d27 | 486 | ret = rv3029_rtc_i2c_alarm_set_irq(client, 0); |
52365230 HS |
487 | if (ret) |
488 | return ret; | |
489 | ||
490 | dev_dbg(&client->dev, "alarm IRQ disabled\n"); | |
491 | } | |
492 | ||
493 | return 0; | |
494 | } | |
495 | ||
aba39d27 | 496 | static int rv3029_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) |
52365230 | 497 | { |
aba39d27 | 498 | return rv3029_rtc_i2c_set_alarm(to_i2c_client(dev), alarm); |
52365230 HS |
499 | } |
500 | ||
501 | static int | |
aba39d27 | 502 | rv3029_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm) |
52365230 HS |
503 | { |
504 | u8 regs[8]; | |
505 | int ret; | |
506 | ||
507 | /* | |
508 | * The clock has an 8 bit wide bcd-coded register (they never learn) | |
509 | * for the year. tm_year is an offset from 1900 and we are interested | |
510 | * in the 2000-2099 range, so any value less than 100 is invalid. | |
511 | */ | |
512 | if (tm->tm_year < 100) | |
513 | return -EINVAL; | |
514 | ||
aba39d27 MB |
515 | regs[RV3029_W_SEC-RV3029_W_SEC] = bin2bcd(tm->tm_sec); |
516 | regs[RV3029_W_MINUTES-RV3029_W_SEC] = bin2bcd(tm->tm_min); | |
517 | regs[RV3029_W_HOURS-RV3029_W_SEC] = bin2bcd(tm->tm_hour); | |
518 | regs[RV3029_W_DATE-RV3029_W_SEC] = bin2bcd(tm->tm_mday); | |
519 | regs[RV3029_W_MONTHS-RV3029_W_SEC] = bin2bcd(tm->tm_mon+1); | |
520 | regs[RV3029_W_DAYS-RV3029_W_SEC] = bin2bcd((tm->tm_wday & 7)+1); | |
521 | regs[RV3029_W_YEARS-RV3029_W_SEC] = bin2bcd(tm->tm_year - 100); | |
52365230 | 522 | |
aba39d27 MB |
523 | ret = rv3029_i2c_write_regs(client, RV3029_W_SEC, regs, |
524 | RV3029_WATCH_SECTION_LEN); | |
52365230 HS |
525 | if (ret < 0) |
526 | return ret; | |
527 | ||
aba39d27 | 528 | ret = rv3029_i2c_get_sr(client, regs); |
52365230 HS |
529 | if (ret < 0) { |
530 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); | |
531 | return ret; | |
532 | } | |
533 | /* clear PON bit */ | |
aba39d27 | 534 | ret = rv3029_i2c_set_sr(client, (regs[0] & ~RV3029_STATUS_PON)); |
52365230 HS |
535 | if (ret < 0) { |
536 | dev_err(&client->dev, "%s: reading SR failed\n", __func__); | |
537 | return ret; | |
538 | } | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
aba39d27 | 543 | static int rv3029_rtc_set_time(struct device *dev, struct rtc_time *tm) |
52365230 | 544 | { |
aba39d27 | 545 | return rv3029_i2c_set_time(to_i2c_client(dev), tm); |
52365230 HS |
546 | } |
547 | ||
e27e2160 MB |
548 | static const struct rv3029_trickle_tab_elem { |
549 | u32 r; /* resistance in ohms */ | |
550 | u8 conf; /* trickle config bits */ | |
551 | } rv3029_trickle_tab[] = { | |
552 | { | |
553 | .r = 1076, | |
554 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | | |
555 | RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, | |
556 | }, { | |
557 | .r = 1091, | |
558 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | | |
559 | RV3029_TRICKLE_20K, | |
560 | }, { | |
561 | .r = 1137, | |
562 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K | | |
563 | RV3029_TRICKLE_80K, | |
564 | }, { | |
565 | .r = 1154, | |
566 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_5K, | |
567 | }, { | |
568 | .r = 1371, | |
569 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K | | |
570 | RV3029_TRICKLE_80K, | |
571 | }, { | |
572 | .r = 1395, | |
573 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_20K, | |
574 | }, { | |
575 | .r = 1472, | |
576 | .conf = RV3029_TRICKLE_1K | RV3029_TRICKLE_80K, | |
577 | }, { | |
578 | .r = 1500, | |
579 | .conf = RV3029_TRICKLE_1K, | |
580 | }, { | |
581 | .r = 3810, | |
582 | .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K | | |
583 | RV3029_TRICKLE_80K, | |
584 | }, { | |
585 | .r = 4000, | |
586 | .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_20K, | |
587 | }, { | |
588 | .r = 4706, | |
589 | .conf = RV3029_TRICKLE_5K | RV3029_TRICKLE_80K, | |
590 | }, { | |
591 | .r = 5000, | |
592 | .conf = RV3029_TRICKLE_5K, | |
593 | }, { | |
594 | .r = 16000, | |
595 | .conf = RV3029_TRICKLE_20K | RV3029_TRICKLE_80K, | |
596 | }, { | |
597 | .r = 20000, | |
598 | .conf = RV3029_TRICKLE_20K, | |
599 | }, { | |
600 | .r = 80000, | |
601 | .conf = RV3029_TRICKLE_80K, | |
602 | }, | |
603 | }; | |
604 | ||
605 | static void rv3029_trickle_config(struct i2c_client *client) | |
606 | { | |
607 | struct device_node *of_node = client->dev.of_node; | |
608 | const struct rv3029_trickle_tab_elem *elem; | |
609 | int i, err; | |
610 | u32 ohms; | |
39387dc2 | 611 | u8 trickle_set_bits; |
e27e2160 MB |
612 | |
613 | if (!of_node) | |
614 | return; | |
615 | ||
616 | /* Configure the trickle charger. */ | |
e27e2160 MB |
617 | err = of_property_read_u32(of_node, "trickle-resistor-ohms", &ohms); |
618 | if (err) { | |
619 | /* Disable trickle charger. */ | |
39387dc2 | 620 | trickle_set_bits = 0; |
e27e2160 MB |
621 | } else { |
622 | /* Enable trickle charger. */ | |
623 | for (i = 0; i < ARRAY_SIZE(rv3029_trickle_tab); i++) { | |
624 | elem = &rv3029_trickle_tab[i]; | |
625 | if (elem->r >= ohms) | |
626 | break; | |
627 | } | |
39387dc2 | 628 | trickle_set_bits = elem->conf; |
e27e2160 MB |
629 | dev_info(&client->dev, |
630 | "Trickle charger enabled at %d ohms resistance.\n", | |
631 | elem->r); | |
632 | } | |
39387dc2 MB |
633 | err = rv3029_eeprom_update_bits(client, RV3029_CONTROL_E2P_EECTRL, |
634 | RV3029_TRICKLE_MASK, | |
635 | trickle_set_bits); | |
e27e2160 MB |
636 | if (err < 0) { |
637 | dev_err(&client->dev, | |
39387dc2 | 638 | "Failed to update trickle charger config\n"); |
e27e2160 MB |
639 | } |
640 | } | |
641 | ||
a696b31e MB |
642 | #ifdef CONFIG_RTC_DRV_RV3029_HWMON |
643 | ||
644 | static int rv3029_read_temp(struct i2c_client *client, int *temp_mC) | |
645 | { | |
646 | int ret; | |
647 | u8 temp; | |
648 | ||
649 | ret = rv3029_i2c_read_regs(client, RV3029_TEMP_PAGE, &temp, 1); | |
650 | if (ret < 0) | |
651 | return ret; | |
652 | ||
653 | *temp_mC = ((int)temp - 60) * 1000; | |
654 | ||
655 | return 0; | |
656 | } | |
657 | ||
658 | static ssize_t rv3029_hwmon_show_temp(struct device *dev, | |
659 | struct device_attribute *attr, | |
660 | char *buf) | |
661 | { | |
662 | struct i2c_client *client = dev_get_drvdata(dev); | |
663 | int ret, temp_mC; | |
664 | ||
665 | ret = rv3029_read_temp(client, &temp_mC); | |
666 | if (ret < 0) | |
667 | return ret; | |
668 | ||
669 | return sprintf(buf, "%d\n", temp_mC); | |
670 | } | |
671 | ||
672 | static ssize_t rv3029_hwmon_set_update_interval(struct device *dev, | |
673 | struct device_attribute *attr, | |
674 | const char *buf, | |
675 | size_t count) | |
676 | { | |
677 | struct i2c_client *client = dev_get_drvdata(dev); | |
678 | unsigned long interval_ms; | |
679 | int ret; | |
680 | u8 th_set_bits = 0; | |
681 | ||
682 | ret = kstrtoul(buf, 10, &interval_ms); | |
683 | if (ret < 0) | |
684 | return ret; | |
685 | ||
686 | if (interval_ms != 0) { | |
687 | th_set_bits |= RV3029_EECTRL_THE; | |
688 | if (interval_ms >= 16000) | |
689 | th_set_bits |= RV3029_EECTRL_THP; | |
690 | } | |
691 | ret = rv3029_eeprom_update_bits(client, RV3029_CONTROL_E2P_EECTRL, | |
692 | RV3029_EECTRL_THE | RV3029_EECTRL_THP, | |
693 | th_set_bits); | |
694 | if (ret < 0) | |
695 | return ret; | |
696 | ||
697 | return count; | |
698 | } | |
699 | ||
700 | static ssize_t rv3029_hwmon_show_update_interval(struct device *dev, | |
701 | struct device_attribute *attr, | |
702 | char *buf) | |
703 | { | |
704 | struct i2c_client *client = dev_get_drvdata(dev); | |
705 | int ret, interval_ms; | |
706 | u8 eectrl; | |
707 | ||
708 | ret = rv3029_eeprom_read(client, RV3029_CONTROL_E2P_EECTRL, | |
709 | &eectrl, 1); | |
710 | if (ret < 0) | |
711 | return ret; | |
712 | ||
713 | if (eectrl & RV3029_EECTRL_THE) { | |
714 | if (eectrl & RV3029_EECTRL_THP) | |
715 | interval_ms = 16000; | |
716 | else | |
717 | interval_ms = 1000; | |
718 | } else { | |
719 | interval_ms = 0; | |
720 | } | |
721 | ||
722 | return sprintf(buf, "%d\n", interval_ms); | |
723 | } | |
724 | ||
725 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, rv3029_hwmon_show_temp, | |
726 | NULL, 0); | |
727 | static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, | |
728 | rv3029_hwmon_show_update_interval, | |
729 | rv3029_hwmon_set_update_interval, 0); | |
730 | ||
731 | static struct attribute *rv3029_hwmon_attrs[] = { | |
732 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
733 | &sensor_dev_attr_update_interval.dev_attr.attr, | |
734 | NULL, | |
735 | }; | |
736 | ATTRIBUTE_GROUPS(rv3029_hwmon); | |
737 | ||
738 | static void rv3029_hwmon_register(struct i2c_client *client) | |
739 | { | |
740 | struct device *hwmon_dev; | |
741 | ||
742 | hwmon_dev = devm_hwmon_device_register_with_groups( | |
743 | &client->dev, client->name, client, rv3029_hwmon_groups); | |
744 | if (IS_ERR(hwmon_dev)) { | |
745 | dev_warn(&client->dev, | |
746 | "unable to register hwmon device %ld\n", | |
747 | PTR_ERR(hwmon_dev)); | |
748 | } | |
749 | } | |
750 | ||
751 | #else /* CONFIG_RTC_DRV_RV3029_HWMON */ | |
752 | ||
753 | static void rv3029_hwmon_register(struct i2c_client *client) | |
754 | { | |
755 | } | |
756 | ||
757 | #endif /* CONFIG_RTC_DRV_RV3029_HWMON */ | |
758 | ||
aba39d27 MB |
759 | static const struct rtc_class_ops rv3029_rtc_ops = { |
760 | .read_time = rv3029_rtc_read_time, | |
761 | .set_time = rv3029_rtc_set_time, | |
762 | .read_alarm = rv3029_rtc_read_alarm, | |
763 | .set_alarm = rv3029_rtc_set_alarm, | |
52365230 HS |
764 | }; |
765 | ||
aba39d27 | 766 | static struct i2c_device_id rv3029_id[] = { |
baba623f | 767 | { "rv3029", 0 }, |
52365230 HS |
768 | { "rv3029c2", 0 }, |
769 | { } | |
770 | }; | |
aba39d27 | 771 | MODULE_DEVICE_TABLE(i2c, rv3029_id); |
52365230 | 772 | |
aba39d27 MB |
773 | static int rv3029_probe(struct i2c_client *client, |
774 | const struct i2c_device_id *id) | |
52365230 HS |
775 | { |
776 | struct rtc_device *rtc; | |
777 | int rc = 0; | |
778 | u8 buf[1]; | |
779 | ||
780 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_EMUL)) | |
781 | return -ENODEV; | |
782 | ||
aba39d27 | 783 | rc = rv3029_i2c_get_sr(client, buf); |
67ab2440 GH |
784 | if (rc < 0) { |
785 | dev_err(&client->dev, "reading status failed\n"); | |
786 | return rc; | |
787 | } | |
788 | ||
e27e2160 | 789 | rv3029_trickle_config(client); |
a696b31e | 790 | rv3029_hwmon_register(client); |
e27e2160 | 791 | |
3d7068c9 | 792 | rtc = devm_rtc_device_register(&client->dev, client->name, |
aba39d27 | 793 | &rv3029_rtc_ops, THIS_MODULE); |
52365230 HS |
794 | |
795 | if (IS_ERR(rtc)) | |
796 | return PTR_ERR(rtc); | |
797 | ||
798 | i2c_set_clientdata(client, rtc); | |
799 | ||
52365230 | 800 | return 0; |
52365230 HS |
801 | } |
802 | ||
aba39d27 | 803 | static struct i2c_driver rv3029_driver = { |
52365230 HS |
804 | .driver = { |
805 | .name = "rtc-rv3029c2", | |
806 | }, | |
aba39d27 MB |
807 | .probe = rv3029_probe, |
808 | .id_table = rv3029_id, | |
52365230 HS |
809 | }; |
810 | ||
aba39d27 | 811 | module_i2c_driver(rv3029_driver); |
52365230 HS |
812 | |
813 | MODULE_AUTHOR("Gregory Hermant <gregory.hermant@calao-systems.com>"); | |
2dca3d9e | 814 | MODULE_AUTHOR("Michael Buesch <m@bues.ch>"); |
aba39d27 | 815 | MODULE_DESCRIPTION("Micro Crystal RV3029 RTC driver"); |
52365230 | 816 | MODULE_LICENSE("GPL"); |