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