Commit | Line | Data |
---|---|---|
1e3929ef AB |
1 | /* |
2 | * RTC driver for the Micro Crystal RV8803 | |
3 | * | |
4 | * Copyright (C) 2015 Micro Crystal SA | |
5 | * | |
6 | * Alexandre Belloni <alexandre.belloni@free-electrons.com> | |
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 | ||
14 | #include <linux/bcd.h> | |
15 | #include <linux/bitops.h> | |
a1e98e09 | 16 | #include <linux/log2.h> |
1e3929ef AB |
17 | #include <linux/i2c.h> |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/rtc.h> | |
22 | ||
d522649e BT |
23 | #define RV8803_I2C_TRY_COUNT 4 |
24 | ||
1e3929ef AB |
25 | #define RV8803_SEC 0x00 |
26 | #define RV8803_MIN 0x01 | |
27 | #define RV8803_HOUR 0x02 | |
28 | #define RV8803_WEEK 0x03 | |
29 | #define RV8803_DAY 0x04 | |
30 | #define RV8803_MONTH 0x05 | |
31 | #define RV8803_YEAR 0x06 | |
32 | #define RV8803_RAM 0x07 | |
33 | #define RV8803_ALARM_MIN 0x08 | |
34 | #define RV8803_ALARM_HOUR 0x09 | |
35 | #define RV8803_ALARM_WEEK_OR_DAY 0x0A | |
36 | #define RV8803_EXT 0x0D | |
37 | #define RV8803_FLAG 0x0E | |
38 | #define RV8803_CTRL 0x0F | |
39 | ||
40 | #define RV8803_EXT_WADA BIT(6) | |
41 | ||
42 | #define RV8803_FLAG_V1F BIT(0) | |
43 | #define RV8803_FLAG_V2F BIT(1) | |
44 | #define RV8803_FLAG_AF BIT(3) | |
45 | #define RV8803_FLAG_TF BIT(4) | |
46 | #define RV8803_FLAG_UF BIT(5) | |
47 | ||
48 | #define RV8803_CTRL_RESET BIT(0) | |
49 | ||
50 | #define RV8803_CTRL_EIE BIT(2) | |
51 | #define RV8803_CTRL_AIE BIT(3) | |
52 | #define RV8803_CTRL_TIE BIT(4) | |
53 | #define RV8803_CTRL_UIE BIT(5) | |
54 | ||
55 | struct rv8803_data { | |
56 | struct i2c_client *client; | |
57 | struct rtc_device *rtc; | |
9d1fa4c3 | 58 | struct mutex flags_lock; |
1e3929ef AB |
59 | u8 ctrl; |
60 | }; | |
61 | ||
d522649e BT |
62 | static int rv8803_read_reg(const struct i2c_client *client, u8 reg) |
63 | { | |
64 | int try = RV8803_I2C_TRY_COUNT; | |
65 | s32 ret; | |
66 | ||
67 | /* | |
68 | * There is a 61µs window during which the RTC does not acknowledge I2C | |
69 | * transfers. In that case, ensure that there are multiple attempts. | |
70 | */ | |
71 | do | |
72 | ret = i2c_smbus_read_byte_data(client, reg); | |
73 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
74 | if (ret < 0) | |
75 | dev_err(&client->dev, "Unable to read register 0x%02x\n", reg); | |
76 | ||
77 | return ret; | |
78 | } | |
79 | ||
80 | static int rv8803_read_regs(const struct i2c_client *client, | |
81 | u8 reg, u8 count, u8 *values) | |
82 | { | |
83 | int try = RV8803_I2C_TRY_COUNT; | |
84 | s32 ret; | |
85 | ||
86 | do | |
87 | ret = i2c_smbus_read_i2c_block_data(client, reg, count, values); | |
88 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
89 | if (ret != count) { | |
90 | dev_err(&client->dev, | |
91 | "Unable to read registers 0x%02x..0x%02x\n", | |
92 | reg, reg + count - 1); | |
93 | return ret < 0 ? ret : -EIO; | |
94 | } | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value) | |
100 | { | |
101 | int try = RV8803_I2C_TRY_COUNT; | |
102 | s32 ret; | |
103 | ||
104 | do | |
105 | ret = i2c_smbus_write_byte_data(client, reg, value); | |
106 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
107 | if (ret) | |
108 | dev_err(&client->dev, "Unable to write register 0x%02x\n", reg); | |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
113 | static int rv8803_write_regs(const struct i2c_client *client, | |
114 | u8 reg, u8 count, const u8 *values) | |
115 | { | |
116 | int try = RV8803_I2C_TRY_COUNT; | |
117 | s32 ret; | |
118 | ||
119 | do | |
120 | ret = i2c_smbus_write_i2c_block_data(client, reg, count, | |
121 | values); | |
122 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
123 | if (ret) | |
124 | dev_err(&client->dev, | |
125 | "Unable to write registers 0x%02x..0x%02x\n", | |
126 | reg, reg + count - 1); | |
127 | ||
128 | return ret; | |
129 | } | |
130 | ||
1e3929ef AB |
131 | static irqreturn_t rv8803_handle_irq(int irq, void *dev_id) |
132 | { | |
133 | struct i2c_client *client = dev_id; | |
134 | struct rv8803_data *rv8803 = i2c_get_clientdata(client); | |
135 | unsigned long events = 0; | |
d522649e | 136 | int flags; |
1e3929ef | 137 | |
9d1fa4c3 | 138 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 139 | |
d522649e | 140 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 141 | if (flags <= 0) { |
9d1fa4c3 | 142 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
143 | return IRQ_NONE; |
144 | } | |
145 | ||
146 | if (flags & RV8803_FLAG_V1F) | |
147 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
148 | ||
149 | if (flags & RV8803_FLAG_V2F) | |
150 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
151 | ||
152 | if (flags & RV8803_FLAG_TF) { | |
153 | flags &= ~RV8803_FLAG_TF; | |
154 | rv8803->ctrl &= ~RV8803_CTRL_TIE; | |
155 | events |= RTC_PF; | |
156 | } | |
157 | ||
158 | if (flags & RV8803_FLAG_AF) { | |
159 | flags &= ~RV8803_FLAG_AF; | |
160 | rv8803->ctrl &= ~RV8803_CTRL_AIE; | |
161 | events |= RTC_AF; | |
162 | } | |
163 | ||
164 | if (flags & RV8803_FLAG_UF) { | |
165 | flags &= ~RV8803_FLAG_UF; | |
166 | rv8803->ctrl &= ~RV8803_CTRL_UIE; | |
167 | events |= RTC_UF; | |
168 | } | |
169 | ||
170 | if (events) { | |
171 | rtc_update_irq(rv8803->rtc, 1, events); | |
d522649e BT |
172 | rv8803_write_reg(client, RV8803_FLAG, flags); |
173 | rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl); | |
1e3929ef AB |
174 | } |
175 | ||
9d1fa4c3 | 176 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
177 | |
178 | return IRQ_HANDLED; | |
179 | } | |
180 | ||
181 | static int rv8803_get_time(struct device *dev, struct rtc_time *tm) | |
182 | { | |
183 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
184 | u8 date1[7]; | |
185 | u8 date2[7]; | |
186 | u8 *date = date1; | |
187 | int ret, flags; | |
188 | ||
d522649e | 189 | flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); |
1e3929ef AB |
190 | if (flags < 0) |
191 | return flags; | |
192 | ||
193 | if (flags & RV8803_FLAG_V2F) { | |
194 | dev_warn(dev, "Voltage low, data is invalid.\n"); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
d522649e BT |
198 | ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date); |
199 | if (ret) | |
200 | return ret; | |
1e3929ef AB |
201 | |
202 | if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) { | |
d522649e BT |
203 | ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2); |
204 | if (ret) | |
205 | return ret; | |
1e3929ef AB |
206 | |
207 | if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59)) | |
208 | date = date2; | |
209 | } | |
210 | ||
211 | tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f); | |
212 | tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f); | |
213 | tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f); | |
a1e98e09 | 214 | tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f); |
1e3929ef AB |
215 | tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f); |
216 | tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1; | |
217 | tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100; | |
218 | ||
96acb25c | 219 | return 0; |
1e3929ef AB |
220 | } |
221 | ||
222 | static int rv8803_set_time(struct device *dev, struct rtc_time *tm) | |
223 | { | |
224 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
225 | u8 date[7]; | |
d3700b6b | 226 | int ctrl, flags, ret; |
1e3929ef AB |
227 | |
228 | if ((tm->tm_year < 100) || (tm->tm_year > 199)) | |
229 | return -EINVAL; | |
230 | ||
d3700b6b BT |
231 | ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL); |
232 | if (ctrl < 0) | |
233 | return ctrl; | |
234 | ||
235 | /* Stop the clock */ | |
236 | ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, | |
237 | ctrl | RV8803_CTRL_RESET); | |
238 | if (ret) | |
239 | return ret; | |
240 | ||
1e3929ef AB |
241 | date[RV8803_SEC] = bin2bcd(tm->tm_sec); |
242 | date[RV8803_MIN] = bin2bcd(tm->tm_min); | |
243 | date[RV8803_HOUR] = bin2bcd(tm->tm_hour); | |
244 | date[RV8803_WEEK] = 1 << (tm->tm_wday); | |
245 | date[RV8803_DAY] = bin2bcd(tm->tm_mday); | |
246 | date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1); | |
247 | date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100); | |
248 | ||
d522649e BT |
249 | ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date); |
250 | if (ret) | |
1e3929ef AB |
251 | return ret; |
252 | ||
d3700b6b BT |
253 | /* Restart the clock */ |
254 | ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, | |
255 | ctrl & ~RV8803_CTRL_RESET); | |
256 | if (ret) | |
257 | return ret; | |
258 | ||
9d1fa4c3 | 259 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 260 | |
d522649e | 261 | flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); |
1e3929ef | 262 | if (flags < 0) { |
9d1fa4c3 | 263 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
264 | return flags; |
265 | } | |
266 | ||
d522649e | 267 | ret = rv8803_write_reg(rv8803->client, RV8803_FLAG, |
6f367788 | 268 | flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F)); |
1e3929ef | 269 | |
9d1fa4c3 | 270 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
271 | |
272 | return ret; | |
273 | } | |
274 | ||
275 | static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
276 | { | |
277 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
278 | struct i2c_client *client = rv8803->client; | |
279 | u8 alarmvals[3]; | |
280 | int flags, ret; | |
281 | ||
d522649e BT |
282 | ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals); |
283 | if (ret) | |
284 | return ret; | |
1e3929ef | 285 | |
d522649e | 286 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
287 | if (flags < 0) |
288 | return flags; | |
289 | ||
290 | alrm->time.tm_sec = 0; | |
291 | alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); | |
292 | alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); | |
1e3929ef | 293 | alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f); |
1e3929ef AB |
294 | |
295 | alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE); | |
296 | alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled; | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
302 | { | |
303 | struct i2c_client *client = to_i2c_client(dev); | |
304 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
305 | u8 alarmvals[3]; | |
306 | u8 ctrl[2]; | |
307 | int ret, err; | |
1e3929ef AB |
308 | |
309 | /* The alarm has no seconds, round up to nearest minute */ | |
310 | if (alrm->time.tm_sec) { | |
311 | time64_t alarm_time = rtc_tm_to_time64(&alrm->time); | |
312 | ||
313 | alarm_time += 60 - alrm->time.tm_sec; | |
314 | rtc_time64_to_tm(alarm_time, &alrm->time); | |
315 | } | |
316 | ||
9d1fa4c3 | 317 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 318 | |
d522649e BT |
319 | ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl); |
320 | if (ret) { | |
9d1fa4c3 | 321 | mutex_unlock(&rv8803->flags_lock); |
d522649e | 322 | return ret; |
1e3929ef AB |
323 | } |
324 | ||
325 | alarmvals[0] = bin2bcd(alrm->time.tm_min); | |
326 | alarmvals[1] = bin2bcd(alrm->time.tm_hour); | |
327 | alarmvals[2] = bin2bcd(alrm->time.tm_mday); | |
328 | ||
329 | if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) { | |
330 | rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE); | |
d522649e BT |
331 | err = rv8803_write_reg(rv8803->client, RV8803_CTRL, |
332 | rv8803->ctrl); | |
1e3929ef | 333 | if (err) { |
9d1fa4c3 | 334 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
335 | return err; |
336 | } | |
337 | } | |
338 | ||
339 | ctrl[1] &= ~RV8803_FLAG_AF; | |
d522649e | 340 | err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]); |
9d1fa4c3 | 341 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
342 | if (err) |
343 | return err; | |
344 | ||
d522649e | 345 | err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals); |
1e3929ef AB |
346 | if (err) |
347 | return err; | |
348 | ||
349 | if (alrm->enabled) { | |
350 | if (rv8803->rtc->uie_rtctimer.enabled) | |
351 | rv8803->ctrl |= RV8803_CTRL_UIE; | |
352 | if (rv8803->rtc->aie_timer.enabled) | |
353 | rv8803->ctrl |= RV8803_CTRL_AIE; | |
354 | ||
d522649e BT |
355 | err = rv8803_write_reg(rv8803->client, RV8803_CTRL, |
356 | rv8803->ctrl); | |
1e3929ef AB |
357 | if (err) |
358 | return err; | |
359 | } | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
365 | { | |
366 | struct i2c_client *client = to_i2c_client(dev); | |
367 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
368 | int ctrl, flags, err; | |
1e3929ef AB |
369 | |
370 | ctrl = rv8803->ctrl; | |
371 | ||
372 | if (enabled) { | |
373 | if (rv8803->rtc->uie_rtctimer.enabled) | |
374 | ctrl |= RV8803_CTRL_UIE; | |
375 | if (rv8803->rtc->aie_timer.enabled) | |
376 | ctrl |= RV8803_CTRL_AIE; | |
377 | } else { | |
378 | if (!rv8803->rtc->uie_rtctimer.enabled) | |
379 | ctrl &= ~RV8803_CTRL_UIE; | |
380 | if (!rv8803->rtc->aie_timer.enabled) | |
381 | ctrl &= ~RV8803_CTRL_AIE; | |
382 | } | |
383 | ||
9d1fa4c3 | 384 | mutex_lock(&rv8803->flags_lock); |
d522649e | 385 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 386 | if (flags < 0) { |
9d1fa4c3 | 387 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
388 | return flags; |
389 | } | |
390 | flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF); | |
d522649e | 391 | err = rv8803_write_reg(client, RV8803_FLAG, flags); |
9d1fa4c3 | 392 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
393 | if (err) |
394 | return err; | |
395 | ||
396 | if (ctrl != rv8803->ctrl) { | |
397 | rv8803->ctrl = ctrl; | |
d522649e | 398 | err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl); |
1e3929ef AB |
399 | if (err) |
400 | return err; | |
401 | } | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
407 | { | |
408 | struct i2c_client *client = to_i2c_client(dev); | |
409 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
410 | int flags, ret = 0; | |
1e3929ef AB |
411 | |
412 | switch (cmd) { | |
413 | case RTC_VL_READ: | |
d522649e | 414 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
415 | if (flags < 0) |
416 | return flags; | |
417 | ||
418 | if (flags & RV8803_FLAG_V1F) | |
419 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
420 | ||
421 | if (flags & RV8803_FLAG_V2F) | |
422 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
423 | ||
424 | flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F; | |
425 | ||
426 | if (copy_to_user((void __user *)arg, &flags, sizeof(int))) | |
427 | return -EFAULT; | |
428 | ||
429 | return 0; | |
430 | ||
431 | case RTC_VL_CLR: | |
9d1fa4c3 | 432 | mutex_lock(&rv8803->flags_lock); |
d522649e | 433 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 434 | if (flags < 0) { |
9d1fa4c3 | 435 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
436 | return flags; |
437 | } | |
438 | ||
439 | flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F); | |
d522649e | 440 | ret = rv8803_write_reg(client, RV8803_FLAG, flags); |
9d1fa4c3 | 441 | mutex_unlock(&rv8803->flags_lock); |
d522649e | 442 | if (ret) |
1e3929ef AB |
443 | return ret; |
444 | ||
445 | return 0; | |
446 | ||
447 | default: | |
448 | return -ENOIOCTLCMD; | |
449 | } | |
450 | } | |
451 | ||
452 | static ssize_t rv8803_nvram_write(struct file *filp, struct kobject *kobj, | |
453 | struct bin_attribute *attr, | |
454 | char *buf, loff_t off, size_t count) | |
455 | { | |
456 | struct device *dev = kobj_to_dev(kobj); | |
457 | struct i2c_client *client = to_i2c_client(dev); | |
458 | int ret; | |
459 | ||
d522649e BT |
460 | ret = rv8803_write_reg(client, RV8803_RAM, buf[0]); |
461 | if (ret) | |
1e3929ef AB |
462 | return ret; |
463 | ||
464 | return 1; | |
465 | } | |
466 | ||
467 | static ssize_t rv8803_nvram_read(struct file *filp, struct kobject *kobj, | |
468 | struct bin_attribute *attr, | |
469 | char *buf, loff_t off, size_t count) | |
470 | { | |
471 | struct device *dev = kobj_to_dev(kobj); | |
472 | struct i2c_client *client = to_i2c_client(dev); | |
473 | int ret; | |
474 | ||
d522649e | 475 | ret = rv8803_read_reg(client, RV8803_RAM); |
1e3929ef AB |
476 | if (ret < 0) |
477 | return ret; | |
478 | ||
479 | buf[0] = ret; | |
480 | ||
481 | return 1; | |
482 | } | |
483 | ||
484 | static struct bin_attribute rv8803_nvram_attr = { | |
485 | .attr = { | |
486 | .name = "nvram", | |
487 | .mode = S_IRUGO | S_IWUSR, | |
488 | }, | |
489 | .size = 1, | |
490 | .read = rv8803_nvram_read, | |
491 | .write = rv8803_nvram_write, | |
492 | }; | |
493 | ||
494 | static struct rtc_class_ops rv8803_rtc_ops = { | |
495 | .read_time = rv8803_get_time, | |
496 | .set_time = rv8803_set_time, | |
497 | .ioctl = rv8803_ioctl, | |
498 | }; | |
499 | ||
500 | static int rv8803_probe(struct i2c_client *client, | |
501 | const struct i2c_device_id *id) | |
502 | { | |
503 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
504 | struct rv8803_data *rv8803; | |
d522649e | 505 | int err, flags; |
1e3929ef AB |
506 | |
507 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
508 | I2C_FUNC_SMBUS_I2C_BLOCK)) { | |
509 | dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n"); | |
510 | return -EIO; | |
511 | } | |
512 | ||
513 | rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data), | |
514 | GFP_KERNEL); | |
515 | if (!rv8803) | |
516 | return -ENOMEM; | |
517 | ||
9d1fa4c3 | 518 | mutex_init(&rv8803->flags_lock); |
1e3929ef AB |
519 | rv8803->client = client; |
520 | i2c_set_clientdata(client, rv8803); | |
521 | ||
d522649e | 522 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
523 | if (flags < 0) |
524 | return flags; | |
525 | ||
526 | if (flags & RV8803_FLAG_V1F) | |
527 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
528 | ||
529 | if (flags & RV8803_FLAG_V2F) | |
530 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
531 | ||
532 | if (flags & RV8803_FLAG_AF) | |
533 | dev_warn(&client->dev, "An alarm maybe have been missed.\n"); | |
534 | ||
535 | if (client->irq > 0) { | |
536 | err = devm_request_threaded_irq(&client->dev, client->irq, | |
537 | NULL, rv8803_handle_irq, | |
538 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
539 | "rv8803", client); | |
540 | if (err) { | |
541 | dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); | |
542 | client->irq = 0; | |
543 | } else { | |
544 | rv8803_rtc_ops.read_alarm = rv8803_get_alarm; | |
545 | rv8803_rtc_ops.set_alarm = rv8803_set_alarm; | |
546 | rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable; | |
547 | } | |
548 | } | |
549 | ||
550 | rv8803->rtc = devm_rtc_device_register(&client->dev, client->name, | |
551 | &rv8803_rtc_ops, THIS_MODULE); | |
552 | if (IS_ERR(rv8803->rtc)) { | |
553 | dev_err(&client->dev, "unable to register the class device\n"); | |
554 | return PTR_ERR(rv8803->rtc); | |
555 | } | |
556 | ||
d522649e | 557 | err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA); |
1e3929ef AB |
558 | if (err) |
559 | return err; | |
560 | ||
561 | err = device_create_bin_file(&client->dev, &rv8803_nvram_attr); | |
562 | if (err) | |
563 | return err; | |
564 | ||
565 | rv8803->rtc->max_user_freq = 1; | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static int rv8803_remove(struct i2c_client *client) | |
571 | { | |
572 | device_remove_bin_file(&client->dev, &rv8803_nvram_attr); | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | static const struct i2c_device_id rv8803_id[] = { | |
578 | { "rv8803", 0 }, | |
78ef5f2d | 579 | { "rx8900", 0 }, |
1e3929ef AB |
580 | { } |
581 | }; | |
582 | MODULE_DEVICE_TABLE(i2c, rv8803_id); | |
583 | ||
584 | static struct i2c_driver rv8803_driver = { | |
585 | .driver = { | |
586 | .name = "rtc-rv8803", | |
587 | }, | |
588 | .probe = rv8803_probe, | |
589 | .remove = rv8803_remove, | |
590 | .id_table = rv8803_id, | |
591 | }; | |
592 | module_i2c_driver(rv8803_driver); | |
593 | ||
594 | MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); | |
595 | MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver"); | |
596 | MODULE_LICENSE("GPL v2"); |