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> | |
740ad8f4 | 21 | #include <linux/of_device.h> |
1e3929ef AB |
22 | #include <linux/rtc.h> |
23 | ||
d522649e BT |
24 | #define RV8803_I2C_TRY_COUNT 4 |
25 | ||
1e3929ef AB |
26 | #define RV8803_SEC 0x00 |
27 | #define RV8803_MIN 0x01 | |
28 | #define RV8803_HOUR 0x02 | |
29 | #define RV8803_WEEK 0x03 | |
30 | #define RV8803_DAY 0x04 | |
31 | #define RV8803_MONTH 0x05 | |
32 | #define RV8803_YEAR 0x06 | |
33 | #define RV8803_RAM 0x07 | |
34 | #define RV8803_ALARM_MIN 0x08 | |
35 | #define RV8803_ALARM_HOUR 0x09 | |
36 | #define RV8803_ALARM_WEEK_OR_DAY 0x0A | |
37 | #define RV8803_EXT 0x0D | |
38 | #define RV8803_FLAG 0x0E | |
39 | #define RV8803_CTRL 0x0F | |
40 | ||
41 | #define RV8803_EXT_WADA BIT(6) | |
42 | ||
43 | #define RV8803_FLAG_V1F BIT(0) | |
44 | #define RV8803_FLAG_V2F BIT(1) | |
45 | #define RV8803_FLAG_AF BIT(3) | |
46 | #define RV8803_FLAG_TF BIT(4) | |
47 | #define RV8803_FLAG_UF BIT(5) | |
48 | ||
49 | #define RV8803_CTRL_RESET BIT(0) | |
50 | ||
51 | #define RV8803_CTRL_EIE BIT(2) | |
52 | #define RV8803_CTRL_AIE BIT(3) | |
53 | #define RV8803_CTRL_TIE BIT(4) | |
54 | #define RV8803_CTRL_UIE BIT(5) | |
55 | ||
1cd71376 OR |
56 | #define RX8900_BACKUP_CTRL 0x18 |
57 | #define RX8900_FLAG_SWOFF BIT(2) | |
58 | #define RX8900_FLAG_VDETOFF BIT(3) | |
59 | ||
60 | enum rv8803_type { | |
61 | rv_8803, | |
62 | rx_8900 | |
63 | }; | |
64 | ||
1e3929ef AB |
65 | struct rv8803_data { |
66 | struct i2c_client *client; | |
67 | struct rtc_device *rtc; | |
9d1fa4c3 | 68 | struct mutex flags_lock; |
1e3929ef | 69 | u8 ctrl; |
1cd71376 | 70 | enum rv8803_type type; |
1e3929ef AB |
71 | }; |
72 | ||
d522649e BT |
73 | static int rv8803_read_reg(const struct i2c_client *client, u8 reg) |
74 | { | |
75 | int try = RV8803_I2C_TRY_COUNT; | |
76 | s32 ret; | |
77 | ||
78 | /* | |
79 | * There is a 61µs window during which the RTC does not acknowledge I2C | |
80 | * transfers. In that case, ensure that there are multiple attempts. | |
81 | */ | |
82 | do | |
83 | ret = i2c_smbus_read_byte_data(client, reg); | |
84 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
85 | if (ret < 0) | |
86 | dev_err(&client->dev, "Unable to read register 0x%02x\n", reg); | |
87 | ||
88 | return ret; | |
89 | } | |
90 | ||
91 | static int rv8803_read_regs(const struct i2c_client *client, | |
92 | u8 reg, u8 count, u8 *values) | |
93 | { | |
94 | int try = RV8803_I2C_TRY_COUNT; | |
95 | s32 ret; | |
96 | ||
97 | do | |
98 | ret = i2c_smbus_read_i2c_block_data(client, reg, count, values); | |
99 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
100 | if (ret != count) { | |
101 | dev_err(&client->dev, | |
102 | "Unable to read registers 0x%02x..0x%02x\n", | |
103 | reg, reg + count - 1); | |
104 | return ret < 0 ? ret : -EIO; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value) | |
111 | { | |
112 | int try = RV8803_I2C_TRY_COUNT; | |
113 | s32 ret; | |
114 | ||
115 | do | |
116 | ret = i2c_smbus_write_byte_data(client, reg, value); | |
117 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
118 | if (ret) | |
119 | dev_err(&client->dev, "Unable to write register 0x%02x\n", reg); | |
120 | ||
121 | return ret; | |
122 | } | |
123 | ||
124 | static int rv8803_write_regs(const struct i2c_client *client, | |
125 | u8 reg, u8 count, const u8 *values) | |
126 | { | |
127 | int try = RV8803_I2C_TRY_COUNT; | |
128 | s32 ret; | |
129 | ||
130 | do | |
131 | ret = i2c_smbus_write_i2c_block_data(client, reg, count, | |
132 | values); | |
133 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
134 | if (ret) | |
135 | dev_err(&client->dev, | |
136 | "Unable to write registers 0x%02x..0x%02x\n", | |
137 | reg, reg + count - 1); | |
138 | ||
139 | return ret; | |
140 | } | |
141 | ||
1e3929ef AB |
142 | static irqreturn_t rv8803_handle_irq(int irq, void *dev_id) |
143 | { | |
144 | struct i2c_client *client = dev_id; | |
145 | struct rv8803_data *rv8803 = i2c_get_clientdata(client); | |
146 | unsigned long events = 0; | |
d522649e | 147 | int flags; |
1e3929ef | 148 | |
9d1fa4c3 | 149 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 150 | |
d522649e | 151 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 152 | if (flags <= 0) { |
9d1fa4c3 | 153 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
154 | return IRQ_NONE; |
155 | } | |
156 | ||
157 | if (flags & RV8803_FLAG_V1F) | |
158 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
159 | ||
160 | if (flags & RV8803_FLAG_V2F) | |
161 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
162 | ||
163 | if (flags & RV8803_FLAG_TF) { | |
164 | flags &= ~RV8803_FLAG_TF; | |
165 | rv8803->ctrl &= ~RV8803_CTRL_TIE; | |
166 | events |= RTC_PF; | |
167 | } | |
168 | ||
169 | if (flags & RV8803_FLAG_AF) { | |
170 | flags &= ~RV8803_FLAG_AF; | |
171 | rv8803->ctrl &= ~RV8803_CTRL_AIE; | |
172 | events |= RTC_AF; | |
173 | } | |
174 | ||
175 | if (flags & RV8803_FLAG_UF) { | |
176 | flags &= ~RV8803_FLAG_UF; | |
177 | rv8803->ctrl &= ~RV8803_CTRL_UIE; | |
178 | events |= RTC_UF; | |
179 | } | |
180 | ||
181 | if (events) { | |
182 | rtc_update_irq(rv8803->rtc, 1, events); | |
d522649e BT |
183 | rv8803_write_reg(client, RV8803_FLAG, flags); |
184 | rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl); | |
1e3929ef AB |
185 | } |
186 | ||
9d1fa4c3 | 187 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
188 | |
189 | return IRQ_HANDLED; | |
190 | } | |
191 | ||
192 | static int rv8803_get_time(struct device *dev, struct rtc_time *tm) | |
193 | { | |
194 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
195 | u8 date1[7]; | |
196 | u8 date2[7]; | |
197 | u8 *date = date1; | |
198 | int ret, flags; | |
199 | ||
d522649e | 200 | flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); |
1e3929ef AB |
201 | if (flags < 0) |
202 | return flags; | |
203 | ||
204 | if (flags & RV8803_FLAG_V2F) { | |
205 | dev_warn(dev, "Voltage low, data is invalid.\n"); | |
206 | return -EINVAL; | |
207 | } | |
208 | ||
d522649e BT |
209 | ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date); |
210 | if (ret) | |
211 | return ret; | |
1e3929ef AB |
212 | |
213 | if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) { | |
d522649e BT |
214 | ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2); |
215 | if (ret) | |
216 | return ret; | |
1e3929ef AB |
217 | |
218 | if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59)) | |
219 | date = date2; | |
220 | } | |
221 | ||
222 | tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f); | |
223 | tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f); | |
224 | tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f); | |
a1e98e09 | 225 | tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f); |
1e3929ef AB |
226 | tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f); |
227 | tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1; | |
228 | tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100; | |
229 | ||
96acb25c | 230 | return 0; |
1e3929ef AB |
231 | } |
232 | ||
233 | static int rv8803_set_time(struct device *dev, struct rtc_time *tm) | |
234 | { | |
235 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
236 | u8 date[7]; | |
d3700b6b | 237 | int ctrl, flags, ret; |
1e3929ef AB |
238 | |
239 | if ((tm->tm_year < 100) || (tm->tm_year > 199)) | |
240 | return -EINVAL; | |
241 | ||
d3700b6b BT |
242 | ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL); |
243 | if (ctrl < 0) | |
244 | return ctrl; | |
245 | ||
246 | /* Stop the clock */ | |
247 | ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, | |
248 | ctrl | RV8803_CTRL_RESET); | |
249 | if (ret) | |
250 | return ret; | |
251 | ||
1e3929ef AB |
252 | date[RV8803_SEC] = bin2bcd(tm->tm_sec); |
253 | date[RV8803_MIN] = bin2bcd(tm->tm_min); | |
254 | date[RV8803_HOUR] = bin2bcd(tm->tm_hour); | |
255 | date[RV8803_WEEK] = 1 << (tm->tm_wday); | |
256 | date[RV8803_DAY] = bin2bcd(tm->tm_mday); | |
257 | date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1); | |
258 | date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100); | |
259 | ||
d522649e BT |
260 | ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date); |
261 | if (ret) | |
1e3929ef AB |
262 | return ret; |
263 | ||
d3700b6b BT |
264 | /* Restart the clock */ |
265 | ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, | |
266 | ctrl & ~RV8803_CTRL_RESET); | |
267 | if (ret) | |
268 | return ret; | |
269 | ||
9d1fa4c3 | 270 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 271 | |
d522649e | 272 | flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); |
1e3929ef | 273 | if (flags < 0) { |
9d1fa4c3 | 274 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
275 | return flags; |
276 | } | |
277 | ||
d522649e | 278 | ret = rv8803_write_reg(rv8803->client, RV8803_FLAG, |
6f367788 | 279 | flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F)); |
1e3929ef | 280 | |
9d1fa4c3 | 281 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
282 | |
283 | return ret; | |
284 | } | |
285 | ||
286 | static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
287 | { | |
288 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
289 | struct i2c_client *client = rv8803->client; | |
290 | u8 alarmvals[3]; | |
291 | int flags, ret; | |
292 | ||
d522649e BT |
293 | ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals); |
294 | if (ret) | |
295 | return ret; | |
1e3929ef | 296 | |
d522649e | 297 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
298 | if (flags < 0) |
299 | return flags; | |
300 | ||
301 | alrm->time.tm_sec = 0; | |
302 | alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); | |
303 | alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); | |
1e3929ef | 304 | alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f); |
1e3929ef AB |
305 | |
306 | alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE); | |
307 | alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled; | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
313 | { | |
314 | struct i2c_client *client = to_i2c_client(dev); | |
315 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
316 | u8 alarmvals[3]; | |
317 | u8 ctrl[2]; | |
318 | int ret, err; | |
1e3929ef AB |
319 | |
320 | /* The alarm has no seconds, round up to nearest minute */ | |
321 | if (alrm->time.tm_sec) { | |
322 | time64_t alarm_time = rtc_tm_to_time64(&alrm->time); | |
323 | ||
324 | alarm_time += 60 - alrm->time.tm_sec; | |
325 | rtc_time64_to_tm(alarm_time, &alrm->time); | |
326 | } | |
327 | ||
9d1fa4c3 | 328 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 329 | |
d522649e BT |
330 | ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl); |
331 | if (ret) { | |
9d1fa4c3 | 332 | mutex_unlock(&rv8803->flags_lock); |
d522649e | 333 | return ret; |
1e3929ef AB |
334 | } |
335 | ||
336 | alarmvals[0] = bin2bcd(alrm->time.tm_min); | |
337 | alarmvals[1] = bin2bcd(alrm->time.tm_hour); | |
338 | alarmvals[2] = bin2bcd(alrm->time.tm_mday); | |
339 | ||
340 | if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) { | |
341 | rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE); | |
d522649e BT |
342 | err = rv8803_write_reg(rv8803->client, RV8803_CTRL, |
343 | rv8803->ctrl); | |
1e3929ef | 344 | if (err) { |
9d1fa4c3 | 345 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
346 | return err; |
347 | } | |
348 | } | |
349 | ||
350 | ctrl[1] &= ~RV8803_FLAG_AF; | |
d522649e | 351 | err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]); |
9d1fa4c3 | 352 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
353 | if (err) |
354 | return err; | |
355 | ||
d522649e | 356 | err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals); |
1e3929ef AB |
357 | if (err) |
358 | return err; | |
359 | ||
360 | if (alrm->enabled) { | |
361 | if (rv8803->rtc->uie_rtctimer.enabled) | |
362 | rv8803->ctrl |= RV8803_CTRL_UIE; | |
363 | if (rv8803->rtc->aie_timer.enabled) | |
364 | rv8803->ctrl |= RV8803_CTRL_AIE; | |
365 | ||
d522649e BT |
366 | err = rv8803_write_reg(rv8803->client, RV8803_CTRL, |
367 | rv8803->ctrl); | |
1e3929ef AB |
368 | if (err) |
369 | return err; | |
370 | } | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
376 | { | |
377 | struct i2c_client *client = to_i2c_client(dev); | |
378 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
379 | int ctrl, flags, err; | |
1e3929ef AB |
380 | |
381 | ctrl = rv8803->ctrl; | |
382 | ||
383 | if (enabled) { | |
384 | if (rv8803->rtc->uie_rtctimer.enabled) | |
385 | ctrl |= RV8803_CTRL_UIE; | |
386 | if (rv8803->rtc->aie_timer.enabled) | |
387 | ctrl |= RV8803_CTRL_AIE; | |
388 | } else { | |
389 | if (!rv8803->rtc->uie_rtctimer.enabled) | |
390 | ctrl &= ~RV8803_CTRL_UIE; | |
391 | if (!rv8803->rtc->aie_timer.enabled) | |
392 | ctrl &= ~RV8803_CTRL_AIE; | |
393 | } | |
394 | ||
9d1fa4c3 | 395 | mutex_lock(&rv8803->flags_lock); |
d522649e | 396 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 397 | if (flags < 0) { |
9d1fa4c3 | 398 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
399 | return flags; |
400 | } | |
401 | flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF); | |
d522649e | 402 | err = rv8803_write_reg(client, RV8803_FLAG, flags); |
9d1fa4c3 | 403 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
404 | if (err) |
405 | return err; | |
406 | ||
407 | if (ctrl != rv8803->ctrl) { | |
408 | rv8803->ctrl = ctrl; | |
d522649e | 409 | err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl); |
1e3929ef AB |
410 | if (err) |
411 | return err; | |
412 | } | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
418 | { | |
419 | struct i2c_client *client = to_i2c_client(dev); | |
420 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
421 | int flags, ret = 0; | |
1e3929ef AB |
422 | |
423 | switch (cmd) { | |
424 | case RTC_VL_READ: | |
d522649e | 425 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
426 | if (flags < 0) |
427 | return flags; | |
428 | ||
429 | if (flags & RV8803_FLAG_V1F) | |
430 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
431 | ||
432 | if (flags & RV8803_FLAG_V2F) | |
433 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
434 | ||
435 | flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F; | |
436 | ||
437 | if (copy_to_user((void __user *)arg, &flags, sizeof(int))) | |
438 | return -EFAULT; | |
439 | ||
440 | return 0; | |
441 | ||
442 | case RTC_VL_CLR: | |
9d1fa4c3 | 443 | mutex_lock(&rv8803->flags_lock); |
d522649e | 444 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 445 | if (flags < 0) { |
9d1fa4c3 | 446 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
447 | return flags; |
448 | } | |
449 | ||
450 | flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F); | |
d522649e | 451 | ret = rv8803_write_reg(client, RV8803_FLAG, flags); |
9d1fa4c3 | 452 | mutex_unlock(&rv8803->flags_lock); |
d522649e | 453 | if (ret) |
1e3929ef AB |
454 | return ret; |
455 | ||
456 | return 0; | |
457 | ||
458 | default: | |
459 | return -ENOIOCTLCMD; | |
460 | } | |
461 | } | |
462 | ||
463 | static ssize_t rv8803_nvram_write(struct file *filp, struct kobject *kobj, | |
464 | struct bin_attribute *attr, | |
465 | char *buf, loff_t off, size_t count) | |
466 | { | |
467 | struct device *dev = kobj_to_dev(kobj); | |
468 | struct i2c_client *client = to_i2c_client(dev); | |
469 | int ret; | |
470 | ||
d522649e BT |
471 | ret = rv8803_write_reg(client, RV8803_RAM, buf[0]); |
472 | if (ret) | |
1e3929ef AB |
473 | return ret; |
474 | ||
475 | return 1; | |
476 | } | |
477 | ||
478 | static ssize_t rv8803_nvram_read(struct file *filp, struct kobject *kobj, | |
479 | struct bin_attribute *attr, | |
480 | char *buf, loff_t off, size_t count) | |
481 | { | |
482 | struct device *dev = kobj_to_dev(kobj); | |
483 | struct i2c_client *client = to_i2c_client(dev); | |
484 | int ret; | |
485 | ||
d522649e | 486 | ret = rv8803_read_reg(client, RV8803_RAM); |
1e3929ef AB |
487 | if (ret < 0) |
488 | return ret; | |
489 | ||
490 | buf[0] = ret; | |
491 | ||
492 | return 1; | |
493 | } | |
494 | ||
495 | static struct bin_attribute rv8803_nvram_attr = { | |
496 | .attr = { | |
497 | .name = "nvram", | |
498 | .mode = S_IRUGO | S_IWUSR, | |
499 | }, | |
500 | .size = 1, | |
501 | .read = rv8803_nvram_read, | |
502 | .write = rv8803_nvram_write, | |
503 | }; | |
504 | ||
505 | static struct rtc_class_ops rv8803_rtc_ops = { | |
506 | .read_time = rv8803_get_time, | |
507 | .set_time = rv8803_set_time, | |
508 | .ioctl = rv8803_ioctl, | |
509 | }; | |
510 | ||
1cd71376 OR |
511 | static int rx8900_trickle_charger_init(struct rv8803_data *rv8803) |
512 | { | |
513 | struct i2c_client *client = rv8803->client; | |
514 | struct device_node *node = client->dev.of_node; | |
515 | int err; | |
516 | u8 flags; | |
517 | ||
518 | if (!node) | |
519 | return 0; | |
520 | ||
521 | if (rv8803->type != rx_8900) | |
522 | return 0; | |
523 | ||
524 | err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL); | |
525 | if (err < 0) | |
526 | return err; | |
527 | ||
528 | flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err; | |
529 | ||
530 | if (of_property_read_bool(node, "epson,vdet-disable")) | |
531 | flags |= RX8900_FLAG_VDETOFF; | |
532 | ||
533 | if (of_property_read_bool(node, "trickle-diode-disable")) | |
534 | flags |= RX8900_FLAG_SWOFF; | |
535 | ||
536 | return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL, | |
537 | flags); | |
538 | } | |
539 | ||
1e3929ef AB |
540 | static int rv8803_probe(struct i2c_client *client, |
541 | const struct i2c_device_id *id) | |
542 | { | |
543 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
544 | struct rv8803_data *rv8803; | |
d522649e | 545 | int err, flags; |
1e3929ef AB |
546 | |
547 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
548 | I2C_FUNC_SMBUS_I2C_BLOCK)) { | |
549 | dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n"); | |
550 | return -EIO; | |
551 | } | |
552 | ||
553 | rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data), | |
554 | GFP_KERNEL); | |
555 | if (!rv8803) | |
556 | return -ENOMEM; | |
557 | ||
9d1fa4c3 | 558 | mutex_init(&rv8803->flags_lock); |
1e3929ef | 559 | rv8803->client = client; |
740ad8f4 JMC |
560 | if (client->dev.of_node) |
561 | rv8803->type = (enum rv8803_type) | |
562 | of_device_get_match_data(&client->dev); | |
563 | else | |
564 | rv8803->type = id->driver_data; | |
1e3929ef AB |
565 | i2c_set_clientdata(client, rv8803); |
566 | ||
d522649e | 567 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
568 | if (flags < 0) |
569 | return flags; | |
570 | ||
571 | if (flags & RV8803_FLAG_V1F) | |
572 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
573 | ||
574 | if (flags & RV8803_FLAG_V2F) | |
575 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
576 | ||
577 | if (flags & RV8803_FLAG_AF) | |
578 | dev_warn(&client->dev, "An alarm maybe have been missed.\n"); | |
579 | ||
580 | if (client->irq > 0) { | |
581 | err = devm_request_threaded_irq(&client->dev, client->irq, | |
582 | NULL, rv8803_handle_irq, | |
583 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
584 | "rv8803", client); | |
585 | if (err) { | |
586 | dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); | |
587 | client->irq = 0; | |
588 | } else { | |
589 | rv8803_rtc_ops.read_alarm = rv8803_get_alarm; | |
590 | rv8803_rtc_ops.set_alarm = rv8803_set_alarm; | |
591 | rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable; | |
592 | } | |
593 | } | |
594 | ||
595 | rv8803->rtc = devm_rtc_device_register(&client->dev, client->name, | |
596 | &rv8803_rtc_ops, THIS_MODULE); | |
597 | if (IS_ERR(rv8803->rtc)) { | |
598 | dev_err(&client->dev, "unable to register the class device\n"); | |
599 | return PTR_ERR(rv8803->rtc); | |
600 | } | |
601 | ||
d522649e | 602 | err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA); |
1e3929ef AB |
603 | if (err) |
604 | return err; | |
605 | ||
1cd71376 OR |
606 | err = rx8900_trickle_charger_init(rv8803); |
607 | if (err) { | |
608 | dev_err(&client->dev, "failed to init charger\n"); | |
609 | return err; | |
610 | } | |
611 | ||
1e3929ef AB |
612 | err = device_create_bin_file(&client->dev, &rv8803_nvram_attr); |
613 | if (err) | |
614 | return err; | |
615 | ||
616 | rv8803->rtc->max_user_freq = 1; | |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static int rv8803_remove(struct i2c_client *client) | |
622 | { | |
623 | device_remove_bin_file(&client->dev, &rv8803_nvram_attr); | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
628 | static const struct i2c_device_id rv8803_id[] = { | |
1cd71376 OR |
629 | { "rv8803", rv_8803 }, |
630 | { "rx8900", rx_8900 }, | |
1e3929ef AB |
631 | { } |
632 | }; | |
633 | MODULE_DEVICE_TABLE(i2c, rv8803_id); | |
634 | ||
740ad8f4 JMC |
635 | static const struct of_device_id rv8803_of_match[] = { |
636 | { | |
637 | .compatible = "microcrystal,rv8803", | |
638 | .data = (void *)rx_8900 | |
639 | }, | |
640 | { | |
641 | .compatible = "epson,rx8900", | |
642 | .data = (void *)rx_8900 | |
643 | }, | |
644 | { } | |
645 | }; | |
646 | MODULE_DEVICE_TABLE(of, rv8803_of_match); | |
647 | ||
1e3929ef AB |
648 | static struct i2c_driver rv8803_driver = { |
649 | .driver = { | |
650 | .name = "rtc-rv8803", | |
740ad8f4 | 651 | .of_match_table = of_match_ptr(rv8803_of_match), |
1e3929ef AB |
652 | }, |
653 | .probe = rv8803_probe, | |
654 | .remove = rv8803_remove, | |
655 | .id_table = rv8803_id, | |
656 | }; | |
657 | module_i2c_driver(rv8803_driver); | |
658 | ||
659 | MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); | |
660 | MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver"); | |
661 | MODULE_LICENSE("GPL v2"); |