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Commit | Line | Data |
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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; |
16d70a78 | 71 | struct nvmem_config nvmem_cfg; |
1e3929ef AB |
72 | }; |
73 | ||
d522649e BT |
74 | static int rv8803_read_reg(const struct i2c_client *client, u8 reg) |
75 | { | |
76 | int try = RV8803_I2C_TRY_COUNT; | |
77 | s32 ret; | |
78 | ||
79 | /* | |
80 | * There is a 61µs window during which the RTC does not acknowledge I2C | |
81 | * transfers. In that case, ensure that there are multiple attempts. | |
82 | */ | |
83 | do | |
84 | ret = i2c_smbus_read_byte_data(client, reg); | |
85 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
86 | if (ret < 0) | |
87 | dev_err(&client->dev, "Unable to read register 0x%02x\n", reg); | |
88 | ||
89 | return ret; | |
90 | } | |
91 | ||
92 | static int rv8803_read_regs(const struct i2c_client *client, | |
93 | u8 reg, u8 count, u8 *values) | |
94 | { | |
95 | int try = RV8803_I2C_TRY_COUNT; | |
96 | s32 ret; | |
97 | ||
98 | do | |
99 | ret = i2c_smbus_read_i2c_block_data(client, reg, count, values); | |
100 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
101 | if (ret != count) { | |
102 | dev_err(&client->dev, | |
103 | "Unable to read registers 0x%02x..0x%02x\n", | |
104 | reg, reg + count - 1); | |
105 | return ret < 0 ? ret : -EIO; | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value) | |
112 | { | |
113 | int try = RV8803_I2C_TRY_COUNT; | |
114 | s32 ret; | |
115 | ||
116 | do | |
117 | ret = i2c_smbus_write_byte_data(client, reg, value); | |
118 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
119 | if (ret) | |
120 | dev_err(&client->dev, "Unable to write register 0x%02x\n", reg); | |
121 | ||
122 | return ret; | |
123 | } | |
124 | ||
125 | static int rv8803_write_regs(const struct i2c_client *client, | |
126 | u8 reg, u8 count, const u8 *values) | |
127 | { | |
128 | int try = RV8803_I2C_TRY_COUNT; | |
129 | s32 ret; | |
130 | ||
131 | do | |
132 | ret = i2c_smbus_write_i2c_block_data(client, reg, count, | |
133 | values); | |
134 | while ((ret == -ENXIO || ret == -EIO) && --try); | |
135 | if (ret) | |
136 | dev_err(&client->dev, | |
137 | "Unable to write registers 0x%02x..0x%02x\n", | |
138 | reg, reg + count - 1); | |
139 | ||
140 | return ret; | |
141 | } | |
142 | ||
1e3929ef AB |
143 | static irqreturn_t rv8803_handle_irq(int irq, void *dev_id) |
144 | { | |
145 | struct i2c_client *client = dev_id; | |
146 | struct rv8803_data *rv8803 = i2c_get_clientdata(client); | |
147 | unsigned long events = 0; | |
d522649e | 148 | int flags; |
1e3929ef | 149 | |
9d1fa4c3 | 150 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 151 | |
d522649e | 152 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 153 | if (flags <= 0) { |
9d1fa4c3 | 154 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
155 | return IRQ_NONE; |
156 | } | |
157 | ||
158 | if (flags & RV8803_FLAG_V1F) | |
159 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
160 | ||
161 | if (flags & RV8803_FLAG_V2F) | |
162 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
163 | ||
164 | if (flags & RV8803_FLAG_TF) { | |
165 | flags &= ~RV8803_FLAG_TF; | |
166 | rv8803->ctrl &= ~RV8803_CTRL_TIE; | |
167 | events |= RTC_PF; | |
168 | } | |
169 | ||
170 | if (flags & RV8803_FLAG_AF) { | |
171 | flags &= ~RV8803_FLAG_AF; | |
172 | rv8803->ctrl &= ~RV8803_CTRL_AIE; | |
173 | events |= RTC_AF; | |
174 | } | |
175 | ||
176 | if (flags & RV8803_FLAG_UF) { | |
177 | flags &= ~RV8803_FLAG_UF; | |
178 | rv8803->ctrl &= ~RV8803_CTRL_UIE; | |
179 | events |= RTC_UF; | |
180 | } | |
181 | ||
182 | if (events) { | |
183 | rtc_update_irq(rv8803->rtc, 1, events); | |
d522649e BT |
184 | rv8803_write_reg(client, RV8803_FLAG, flags); |
185 | rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl); | |
1e3929ef AB |
186 | } |
187 | ||
9d1fa4c3 | 188 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
189 | |
190 | return IRQ_HANDLED; | |
191 | } | |
192 | ||
193 | static int rv8803_get_time(struct device *dev, struct rtc_time *tm) | |
194 | { | |
195 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
196 | u8 date1[7]; | |
197 | u8 date2[7]; | |
198 | u8 *date = date1; | |
199 | int ret, flags; | |
200 | ||
d522649e | 201 | flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); |
1e3929ef AB |
202 | if (flags < 0) |
203 | return flags; | |
204 | ||
205 | if (flags & RV8803_FLAG_V2F) { | |
206 | dev_warn(dev, "Voltage low, data is invalid.\n"); | |
207 | return -EINVAL; | |
208 | } | |
209 | ||
d522649e BT |
210 | ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date); |
211 | if (ret) | |
212 | return ret; | |
1e3929ef AB |
213 | |
214 | if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) { | |
d522649e BT |
215 | ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2); |
216 | if (ret) | |
217 | return ret; | |
1e3929ef AB |
218 | |
219 | if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59)) | |
220 | date = date2; | |
221 | } | |
222 | ||
223 | tm->tm_sec = bcd2bin(date[RV8803_SEC] & 0x7f); | |
224 | tm->tm_min = bcd2bin(date[RV8803_MIN] & 0x7f); | |
225 | tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f); | |
a1e98e09 | 226 | tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f); |
1e3929ef AB |
227 | tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f); |
228 | tm->tm_mon = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1; | |
229 | tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100; | |
230 | ||
96acb25c | 231 | return 0; |
1e3929ef AB |
232 | } |
233 | ||
234 | static int rv8803_set_time(struct device *dev, struct rtc_time *tm) | |
235 | { | |
236 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
237 | u8 date[7]; | |
d3700b6b | 238 | int ctrl, flags, ret; |
1e3929ef AB |
239 | |
240 | if ((tm->tm_year < 100) || (tm->tm_year > 199)) | |
241 | return -EINVAL; | |
242 | ||
d3700b6b BT |
243 | ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL); |
244 | if (ctrl < 0) | |
245 | return ctrl; | |
246 | ||
247 | /* Stop the clock */ | |
248 | ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, | |
249 | ctrl | RV8803_CTRL_RESET); | |
250 | if (ret) | |
251 | return ret; | |
252 | ||
1e3929ef AB |
253 | date[RV8803_SEC] = bin2bcd(tm->tm_sec); |
254 | date[RV8803_MIN] = bin2bcd(tm->tm_min); | |
255 | date[RV8803_HOUR] = bin2bcd(tm->tm_hour); | |
256 | date[RV8803_WEEK] = 1 << (tm->tm_wday); | |
257 | date[RV8803_DAY] = bin2bcd(tm->tm_mday); | |
258 | date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1); | |
259 | date[RV8803_YEAR] = bin2bcd(tm->tm_year - 100); | |
260 | ||
d522649e BT |
261 | ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date); |
262 | if (ret) | |
1e3929ef AB |
263 | return ret; |
264 | ||
d3700b6b BT |
265 | /* Restart the clock */ |
266 | ret = rv8803_write_reg(rv8803->client, RV8803_CTRL, | |
267 | ctrl & ~RV8803_CTRL_RESET); | |
268 | if (ret) | |
269 | return ret; | |
270 | ||
9d1fa4c3 | 271 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 272 | |
d522649e | 273 | flags = rv8803_read_reg(rv8803->client, RV8803_FLAG); |
1e3929ef | 274 | if (flags < 0) { |
9d1fa4c3 | 275 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
276 | return flags; |
277 | } | |
278 | ||
d522649e | 279 | ret = rv8803_write_reg(rv8803->client, RV8803_FLAG, |
6f367788 | 280 | flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F)); |
1e3929ef | 281 | |
9d1fa4c3 | 282 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
283 | |
284 | return ret; | |
285 | } | |
286 | ||
287 | static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
288 | { | |
289 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
290 | struct i2c_client *client = rv8803->client; | |
291 | u8 alarmvals[3]; | |
292 | int flags, ret; | |
293 | ||
d522649e BT |
294 | ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals); |
295 | if (ret) | |
296 | return ret; | |
1e3929ef | 297 | |
d522649e | 298 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
299 | if (flags < 0) |
300 | return flags; | |
301 | ||
302 | alrm->time.tm_sec = 0; | |
303 | alrm->time.tm_min = bcd2bin(alarmvals[0] & 0x7f); | |
304 | alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f); | |
1e3929ef | 305 | alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f); |
1e3929ef AB |
306 | |
307 | alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE); | |
308 | alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) | |
314 | { | |
315 | struct i2c_client *client = to_i2c_client(dev); | |
316 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
317 | u8 alarmvals[3]; | |
318 | u8 ctrl[2]; | |
319 | int ret, err; | |
1e3929ef AB |
320 | |
321 | /* The alarm has no seconds, round up to nearest minute */ | |
322 | if (alrm->time.tm_sec) { | |
323 | time64_t alarm_time = rtc_tm_to_time64(&alrm->time); | |
324 | ||
325 | alarm_time += 60 - alrm->time.tm_sec; | |
326 | rtc_time64_to_tm(alarm_time, &alrm->time); | |
327 | } | |
328 | ||
9d1fa4c3 | 329 | mutex_lock(&rv8803->flags_lock); |
1e3929ef | 330 | |
d522649e BT |
331 | ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl); |
332 | if (ret) { | |
9d1fa4c3 | 333 | mutex_unlock(&rv8803->flags_lock); |
d522649e | 334 | return ret; |
1e3929ef AB |
335 | } |
336 | ||
337 | alarmvals[0] = bin2bcd(alrm->time.tm_min); | |
338 | alarmvals[1] = bin2bcd(alrm->time.tm_hour); | |
339 | alarmvals[2] = bin2bcd(alrm->time.tm_mday); | |
340 | ||
341 | if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) { | |
342 | rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE); | |
d522649e BT |
343 | err = rv8803_write_reg(rv8803->client, RV8803_CTRL, |
344 | rv8803->ctrl); | |
1e3929ef | 345 | if (err) { |
9d1fa4c3 | 346 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
347 | return err; |
348 | } | |
349 | } | |
350 | ||
351 | ctrl[1] &= ~RV8803_FLAG_AF; | |
d522649e | 352 | err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]); |
9d1fa4c3 | 353 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
354 | if (err) |
355 | return err; | |
356 | ||
d522649e | 357 | err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals); |
1e3929ef AB |
358 | if (err) |
359 | return err; | |
360 | ||
361 | if (alrm->enabled) { | |
362 | if (rv8803->rtc->uie_rtctimer.enabled) | |
363 | rv8803->ctrl |= RV8803_CTRL_UIE; | |
364 | if (rv8803->rtc->aie_timer.enabled) | |
365 | rv8803->ctrl |= RV8803_CTRL_AIE; | |
366 | ||
d522649e BT |
367 | err = rv8803_write_reg(rv8803->client, RV8803_CTRL, |
368 | rv8803->ctrl); | |
1e3929ef AB |
369 | if (err) |
370 | return err; | |
371 | } | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
376 | static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled) | |
377 | { | |
378 | struct i2c_client *client = to_i2c_client(dev); | |
379 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
380 | int ctrl, flags, err; | |
1e3929ef AB |
381 | |
382 | ctrl = rv8803->ctrl; | |
383 | ||
384 | if (enabled) { | |
385 | if (rv8803->rtc->uie_rtctimer.enabled) | |
386 | ctrl |= RV8803_CTRL_UIE; | |
387 | if (rv8803->rtc->aie_timer.enabled) | |
388 | ctrl |= RV8803_CTRL_AIE; | |
389 | } else { | |
390 | if (!rv8803->rtc->uie_rtctimer.enabled) | |
391 | ctrl &= ~RV8803_CTRL_UIE; | |
392 | if (!rv8803->rtc->aie_timer.enabled) | |
393 | ctrl &= ~RV8803_CTRL_AIE; | |
394 | } | |
395 | ||
9d1fa4c3 | 396 | mutex_lock(&rv8803->flags_lock); |
d522649e | 397 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 398 | if (flags < 0) { |
9d1fa4c3 | 399 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
400 | return flags; |
401 | } | |
402 | flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF); | |
d522649e | 403 | err = rv8803_write_reg(client, RV8803_FLAG, flags); |
9d1fa4c3 | 404 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
405 | if (err) |
406 | return err; | |
407 | ||
408 | if (ctrl != rv8803->ctrl) { | |
409 | rv8803->ctrl = ctrl; | |
d522649e | 410 | err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl); |
1e3929ef AB |
411 | if (err) |
412 | return err; | |
413 | } | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) | |
419 | { | |
420 | struct i2c_client *client = to_i2c_client(dev); | |
421 | struct rv8803_data *rv8803 = dev_get_drvdata(dev); | |
422 | int flags, ret = 0; | |
1e3929ef AB |
423 | |
424 | switch (cmd) { | |
425 | case RTC_VL_READ: | |
d522649e | 426 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
427 | if (flags < 0) |
428 | return flags; | |
429 | ||
430 | if (flags & RV8803_FLAG_V1F) | |
431 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
432 | ||
433 | if (flags & RV8803_FLAG_V2F) | |
434 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
435 | ||
436 | flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F; | |
437 | ||
438 | if (copy_to_user((void __user *)arg, &flags, sizeof(int))) | |
439 | return -EFAULT; | |
440 | ||
441 | return 0; | |
442 | ||
443 | case RTC_VL_CLR: | |
9d1fa4c3 | 444 | mutex_lock(&rv8803->flags_lock); |
d522649e | 445 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef | 446 | if (flags < 0) { |
9d1fa4c3 | 447 | mutex_unlock(&rv8803->flags_lock); |
1e3929ef AB |
448 | return flags; |
449 | } | |
450 | ||
451 | flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F); | |
d522649e | 452 | ret = rv8803_write_reg(client, RV8803_FLAG, flags); |
9d1fa4c3 | 453 | mutex_unlock(&rv8803->flags_lock); |
d522649e | 454 | if (ret) |
1e3929ef AB |
455 | return ret; |
456 | ||
457 | return 0; | |
458 | ||
459 | default: | |
460 | return -ENOIOCTLCMD; | |
461 | } | |
462 | } | |
463 | ||
16d70a78 AB |
464 | static int rv8803_nvram_write(void *priv, unsigned int offset, void *val, |
465 | size_t bytes) | |
1e3929ef | 466 | { |
1e3929ef AB |
467 | int ret; |
468 | ||
16d70a78 | 469 | ret = rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val); |
d522649e | 470 | if (ret) |
1e3929ef AB |
471 | return ret; |
472 | ||
16d70a78 | 473 | return 0; |
1e3929ef AB |
474 | } |
475 | ||
16d70a78 AB |
476 | static int rv8803_nvram_read(void *priv, unsigned int offset, |
477 | void *val, size_t bytes) | |
1e3929ef | 478 | { |
1e3929ef AB |
479 | int ret; |
480 | ||
16d70a78 | 481 | ret = rv8803_read_reg(priv, RV8803_RAM); |
1e3929ef AB |
482 | if (ret < 0) |
483 | return ret; | |
484 | ||
16d70a78 | 485 | *(u8 *)val = ret; |
1e3929ef | 486 | |
16d70a78 | 487 | return 0; |
1e3929ef AB |
488 | } |
489 | ||
1e3929ef AB |
490 | static struct rtc_class_ops rv8803_rtc_ops = { |
491 | .read_time = rv8803_get_time, | |
492 | .set_time = rv8803_set_time, | |
493 | .ioctl = rv8803_ioctl, | |
494 | }; | |
495 | ||
1cd71376 OR |
496 | static int rx8900_trickle_charger_init(struct rv8803_data *rv8803) |
497 | { | |
498 | struct i2c_client *client = rv8803->client; | |
499 | struct device_node *node = client->dev.of_node; | |
500 | int err; | |
501 | u8 flags; | |
502 | ||
503 | if (!node) | |
504 | return 0; | |
505 | ||
506 | if (rv8803->type != rx_8900) | |
507 | return 0; | |
508 | ||
509 | err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL); | |
510 | if (err < 0) | |
511 | return err; | |
512 | ||
513 | flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err; | |
514 | ||
515 | if (of_property_read_bool(node, "epson,vdet-disable")) | |
516 | flags |= RX8900_FLAG_VDETOFF; | |
517 | ||
518 | if (of_property_read_bool(node, "trickle-diode-disable")) | |
519 | flags |= RX8900_FLAG_SWOFF; | |
520 | ||
521 | return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL, | |
522 | flags); | |
523 | } | |
524 | ||
1e3929ef AB |
525 | static int rv8803_probe(struct i2c_client *client, |
526 | const struct i2c_device_id *id) | |
527 | { | |
528 | struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); | |
529 | struct rv8803_data *rv8803; | |
d522649e | 530 | int err, flags; |
1e3929ef AB |
531 | |
532 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | | |
533 | I2C_FUNC_SMBUS_I2C_BLOCK)) { | |
534 | dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n"); | |
535 | return -EIO; | |
536 | } | |
537 | ||
538 | rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data), | |
539 | GFP_KERNEL); | |
540 | if (!rv8803) | |
541 | return -ENOMEM; | |
542 | ||
9d1fa4c3 | 543 | mutex_init(&rv8803->flags_lock); |
1e3929ef | 544 | rv8803->client = client; |
740ad8f4 JMC |
545 | if (client->dev.of_node) |
546 | rv8803->type = (enum rv8803_type) | |
547 | of_device_get_match_data(&client->dev); | |
548 | else | |
549 | rv8803->type = id->driver_data; | |
1e3929ef AB |
550 | i2c_set_clientdata(client, rv8803); |
551 | ||
d522649e | 552 | flags = rv8803_read_reg(client, RV8803_FLAG); |
1e3929ef AB |
553 | if (flags < 0) |
554 | return flags; | |
555 | ||
556 | if (flags & RV8803_FLAG_V1F) | |
557 | dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n"); | |
558 | ||
559 | if (flags & RV8803_FLAG_V2F) | |
560 | dev_warn(&client->dev, "Voltage low, data loss detected.\n"); | |
561 | ||
562 | if (flags & RV8803_FLAG_AF) | |
563 | dev_warn(&client->dev, "An alarm maybe have been missed.\n"); | |
564 | ||
7133eca1 AB |
565 | rv8803->rtc = devm_rtc_allocate_device(&client->dev); |
566 | if (IS_ERR(rv8803->rtc)) { | |
567 | return PTR_ERR(rv8803->rtc); | |
568 | } | |
569 | ||
1e3929ef AB |
570 | if (client->irq > 0) { |
571 | err = devm_request_threaded_irq(&client->dev, client->irq, | |
572 | NULL, rv8803_handle_irq, | |
573 | IRQF_TRIGGER_LOW | IRQF_ONESHOT, | |
574 | "rv8803", client); | |
575 | if (err) { | |
576 | dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n"); | |
577 | client->irq = 0; | |
578 | } else { | |
579 | rv8803_rtc_ops.read_alarm = rv8803_get_alarm; | |
580 | rv8803_rtc_ops.set_alarm = rv8803_set_alarm; | |
581 | rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable; | |
582 | } | |
583 | } | |
584 | ||
16d70a78 AB |
585 | rv8803->nvmem_cfg.name = "rv8803_nvram", |
586 | rv8803->nvmem_cfg.word_size = 1, | |
587 | rv8803->nvmem_cfg.stride = 1, | |
588 | rv8803->nvmem_cfg.size = 1, | |
589 | rv8803->nvmem_cfg.reg_read = rv8803_nvram_read, | |
590 | rv8803->nvmem_cfg.reg_write = rv8803_nvram_write, | |
591 | rv8803->nvmem_cfg.priv = client; | |
592 | ||
7133eca1 | 593 | rv8803->rtc->ops = &rv8803_rtc_ops; |
16d70a78 AB |
594 | rv8803->rtc->nvmem_config = &rv8803->nvmem_cfg; |
595 | rv8803->rtc->nvram_old_abi = true; | |
7133eca1 AB |
596 | err = rtc_register_device(rv8803->rtc); |
597 | if (err) | |
598 | return err; | |
1e3929ef | 599 | |
d522649e | 600 | err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA); |
1e3929ef AB |
601 | if (err) |
602 | return err; | |
603 | ||
1cd71376 OR |
604 | err = rx8900_trickle_charger_init(rv8803); |
605 | if (err) { | |
606 | dev_err(&client->dev, "failed to init charger\n"); | |
607 | return err; | |
608 | } | |
609 | ||
1e3929ef AB |
610 | rv8803->rtc->max_user_freq = 1; |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
1e3929ef | 615 | static const struct i2c_device_id rv8803_id[] = { |
1cd71376 OR |
616 | { "rv8803", rv_8803 }, |
617 | { "rx8900", rx_8900 }, | |
1e3929ef AB |
618 | { } |
619 | }; | |
620 | MODULE_DEVICE_TABLE(i2c, rv8803_id); | |
621 | ||
740ad8f4 JMC |
622 | static const struct of_device_id rv8803_of_match[] = { |
623 | { | |
624 | .compatible = "microcrystal,rv8803", | |
625 | .data = (void *)rx_8900 | |
626 | }, | |
627 | { | |
628 | .compatible = "epson,rx8900", | |
629 | .data = (void *)rx_8900 | |
630 | }, | |
631 | { } | |
632 | }; | |
633 | MODULE_DEVICE_TABLE(of, rv8803_of_match); | |
634 | ||
1e3929ef AB |
635 | static struct i2c_driver rv8803_driver = { |
636 | .driver = { | |
637 | .name = "rtc-rv8803", | |
740ad8f4 | 638 | .of_match_table = of_match_ptr(rv8803_of_match), |
1e3929ef AB |
639 | }, |
640 | .probe = rv8803_probe, | |
1e3929ef AB |
641 | .id_table = rv8803_id, |
642 | }; | |
643 | module_i2c_driver(rv8803_driver); | |
644 | ||
645 | MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); | |
646 | MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver"); | |
647 | MODULE_LICENSE("GPL v2"); |