Commit | Line | Data |
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4d61ff6b PDM |
1 | /* |
2 | * A driver for the I2C members of the Abracon AB x8xx RTC family, | |
3 | * and compatible: AB 1805 and AB 0805 | |
4 | * | |
5 | * Copyright 2014-2015 Macq S.A. | |
6 | * | |
7 | * Author: Philippe De Muyter <phdm@macqel.be> | |
8 | * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/bcd.h> | |
17 | #include <linux/i2c.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/rtc.h> | |
20 | ||
21 | #define ABX8XX_REG_HTH 0x00 | |
22 | #define ABX8XX_REG_SC 0x01 | |
23 | #define ABX8XX_REG_MN 0x02 | |
24 | #define ABX8XX_REG_HR 0x03 | |
25 | #define ABX8XX_REG_DA 0x04 | |
26 | #define ABX8XX_REG_MO 0x05 | |
27 | #define ABX8XX_REG_YR 0x06 | |
28 | #define ABX8XX_REG_WD 0x07 | |
29 | ||
718a820a AB |
30 | #define ABX8XX_REG_AHTH 0x08 |
31 | #define ABX8XX_REG_ASC 0x09 | |
32 | #define ABX8XX_REG_AMN 0x0a | |
33 | #define ABX8XX_REG_AHR 0x0b | |
34 | #define ABX8XX_REG_ADA 0x0c | |
35 | #define ABX8XX_REG_AMO 0x0d | |
36 | #define ABX8XX_REG_AWD 0x0e | |
37 | ||
38 | #define ABX8XX_REG_STATUS 0x0f | |
39 | #define ABX8XX_STATUS_AF BIT(2) | |
40 | ||
4d61ff6b | 41 | #define ABX8XX_REG_CTRL1 0x10 |
5f1b2f77 | 42 | #define ABX8XX_CTRL_WRITE BIT(0) |
718a820a | 43 | #define ABX8XX_CTRL_ARST BIT(2) |
4d61ff6b PDM |
44 | #define ABX8XX_CTRL_12_24 BIT(6) |
45 | ||
718a820a AB |
46 | #define ABX8XX_REG_IRQ 0x12 |
47 | #define ABX8XX_IRQ_AIE BIT(2) | |
48 | #define ABX8XX_IRQ_IM_1_4 (0x3 << 5) | |
49 | ||
50 | #define ABX8XX_REG_CD_TIMER_CTL 0x18 | |
51 | ||
59a8383a MJ |
52 | #define ABX8XX_REG_OSC 0x1c |
53 | #define ABX8XX_OSC_FOS BIT(3) | |
54 | #define ABX8XX_OSC_BOS BIT(4) | |
55 | #define ABX8XX_OSC_ACAL_512 BIT(5) | |
56 | #define ABX8XX_OSC_ACAL_1024 BIT(6) | |
57 | ||
58 | #define ABX8XX_OSC_OSEL BIT(7) | |
59 | ||
60 | #define ABX8XX_REG_OSS 0x1d | |
ee087744 | 61 | #define ABX8XX_OSS_OF BIT(1) |
59a8383a MJ |
62 | #define ABX8XX_OSS_OMODE BIT(4) |
63 | ||
4d61ff6b | 64 | #define ABX8XX_REG_CFG_KEY 0x1f |
59a8383a | 65 | #define ABX8XX_CFG_KEY_OSC 0xa1 |
4d61ff6b PDM |
66 | #define ABX8XX_CFG_KEY_MISC 0x9d |
67 | ||
68 | #define ABX8XX_REG_ID0 0x28 | |
69 | ||
70 | #define ABX8XX_REG_TRICKLE 0x20 | |
71 | #define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0 | |
72 | #define ABX8XX_TRICKLE_STANDARD_DIODE 0x8 | |
73 | #define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4 | |
74 | ||
75 | static u8 trickle_resistors[] = {0, 3, 6, 11}; | |
76 | ||
77 | enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, | |
78 | AB1801, AB1803, AB1804, AB1805, ABX80X}; | |
79 | ||
80 | struct abx80x_cap { | |
81 | u16 pn; | |
82 | bool has_tc; | |
83 | }; | |
84 | ||
85 | static struct abx80x_cap abx80x_caps[] = { | |
86 | [AB0801] = {.pn = 0x0801}, | |
87 | [AB0803] = {.pn = 0x0803}, | |
88 | [AB0804] = {.pn = 0x0804, .has_tc = true}, | |
89 | [AB0805] = {.pn = 0x0805, .has_tc = true}, | |
90 | [AB1801] = {.pn = 0x1801}, | |
91 | [AB1803] = {.pn = 0x1803}, | |
92 | [AB1804] = {.pn = 0x1804, .has_tc = true}, | |
93 | [AB1805] = {.pn = 0x1805, .has_tc = true}, | |
94 | [ABX80X] = {.pn = 0} | |
95 | }; | |
96 | ||
59a8383a MJ |
97 | static int abx80x_is_rc_mode(struct i2c_client *client) |
98 | { | |
99 | int flags = 0; | |
100 | ||
101 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); | |
102 | if (flags < 0) { | |
103 | dev_err(&client->dev, | |
104 | "Failed to read autocalibration attribute\n"); | |
105 | return flags; | |
106 | } | |
107 | ||
108 | return (flags & ABX8XX_OSS_OMODE) ? 1 : 0; | |
109 | } | |
110 | ||
4d61ff6b PDM |
111 | static int abx80x_enable_trickle_charger(struct i2c_client *client, |
112 | u8 trickle_cfg) | |
113 | { | |
114 | int err; | |
115 | ||
116 | /* | |
117 | * Write the configuration key register to enable access to the Trickle | |
118 | * register | |
119 | */ | |
120 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, | |
121 | ABX8XX_CFG_KEY_MISC); | |
122 | if (err < 0) { | |
123 | dev_err(&client->dev, "Unable to write configuration key\n"); | |
124 | return -EIO; | |
125 | } | |
126 | ||
127 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE, | |
128 | ABX8XX_TRICKLE_CHARGE_ENABLE | | |
129 | trickle_cfg); | |
130 | if (err < 0) { | |
131 | dev_err(&client->dev, "Unable to write trickle register\n"); | |
132 | return -EIO; | |
133 | } | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
139 | { | |
140 | struct i2c_client *client = to_i2c_client(dev); | |
141 | unsigned char buf[8]; | |
ee087744 MJ |
142 | int err, flags, rc_mode = 0; |
143 | ||
144 | /* Read the Oscillator Failure only in XT mode */ | |
145 | rc_mode = abx80x_is_rc_mode(client); | |
146 | if (rc_mode < 0) | |
147 | return rc_mode; | |
148 | ||
149 | if (!rc_mode) { | |
150 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); | |
151 | if (flags < 0) | |
152 | return flags; | |
153 | ||
154 | if (flags & ABX8XX_OSS_OF) { | |
155 | dev_err(dev, "Oscillator failure, data is invalid.\n"); | |
156 | return -EINVAL; | |
157 | } | |
158 | } | |
4d61ff6b PDM |
159 | |
160 | err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH, | |
161 | sizeof(buf), buf); | |
162 | if (err < 0) { | |
163 | dev_err(&client->dev, "Unable to read date\n"); | |
164 | return -EIO; | |
165 | } | |
166 | ||
167 | tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F); | |
168 | tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F); | |
169 | tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F); | |
170 | tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7; | |
171 | tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F); | |
172 | tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1; | |
173 | tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100; | |
174 | ||
fbfd36fd | 175 | return 0; |
4d61ff6b PDM |
176 | } |
177 | ||
178 | static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
179 | { | |
180 | struct i2c_client *client = to_i2c_client(dev); | |
181 | unsigned char buf[8]; | |
ee087744 | 182 | int err, flags; |
4d61ff6b PDM |
183 | |
184 | if (tm->tm_year < 100) | |
185 | return -EINVAL; | |
186 | ||
187 | buf[ABX8XX_REG_HTH] = 0; | |
188 | buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec); | |
189 | buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min); | |
190 | buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour); | |
191 | buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday); | |
192 | buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1); | |
193 | buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100); | |
194 | buf[ABX8XX_REG_WD] = tm->tm_wday; | |
195 | ||
196 | err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH, | |
197 | sizeof(buf), buf); | |
198 | if (err < 0) { | |
199 | dev_err(&client->dev, "Unable to write to date registers\n"); | |
200 | return -EIO; | |
201 | } | |
202 | ||
ee087744 MJ |
203 | /* Clear the OF bit of Oscillator Status Register */ |
204 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); | |
205 | if (flags < 0) | |
206 | return flags; | |
207 | ||
208 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS, | |
209 | flags & ~ABX8XX_OSS_OF); | |
210 | if (err < 0) { | |
211 | dev_err(&client->dev, "Unable to write oscillator status register\n"); | |
212 | return err; | |
213 | } | |
214 | ||
4d61ff6b PDM |
215 | return 0; |
216 | } | |
217 | ||
718a820a AB |
218 | static irqreturn_t abx80x_handle_irq(int irq, void *dev_id) |
219 | { | |
220 | struct i2c_client *client = dev_id; | |
221 | struct rtc_device *rtc = i2c_get_clientdata(client); | |
222 | int status; | |
223 | ||
224 | status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); | |
225 | if (status < 0) | |
226 | return IRQ_NONE; | |
227 | ||
228 | if (status & ABX8XX_STATUS_AF) | |
229 | rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF); | |
230 | ||
231 | i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); | |
232 | ||
233 | return IRQ_HANDLED; | |
234 | } | |
235 | ||
236 | static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
237 | { | |
238 | struct i2c_client *client = to_i2c_client(dev); | |
239 | unsigned char buf[7]; | |
240 | ||
241 | int irq_mask, err; | |
242 | ||
243 | if (client->irq <= 0) | |
244 | return -EINVAL; | |
245 | ||
246 | err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC, | |
247 | sizeof(buf), buf); | |
248 | if (err) | |
249 | return err; | |
250 | ||
251 | irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ); | |
252 | if (irq_mask < 0) | |
253 | return irq_mask; | |
254 | ||
255 | t->time.tm_sec = bcd2bin(buf[0] & 0x7F); | |
256 | t->time.tm_min = bcd2bin(buf[1] & 0x7F); | |
257 | t->time.tm_hour = bcd2bin(buf[2] & 0x3F); | |
258 | t->time.tm_mday = bcd2bin(buf[3] & 0x3F); | |
259 | t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1; | |
260 | t->time.tm_wday = buf[5] & 0x7; | |
261 | ||
262 | t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE); | |
263 | t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled; | |
264 | ||
265 | return err; | |
266 | } | |
267 | ||
268 | static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
269 | { | |
270 | struct i2c_client *client = to_i2c_client(dev); | |
271 | u8 alarm[6]; | |
272 | int err; | |
273 | ||
274 | if (client->irq <= 0) | |
275 | return -EINVAL; | |
276 | ||
277 | alarm[0] = 0x0; | |
278 | alarm[1] = bin2bcd(t->time.tm_sec); | |
279 | alarm[2] = bin2bcd(t->time.tm_min); | |
280 | alarm[3] = bin2bcd(t->time.tm_hour); | |
281 | alarm[4] = bin2bcd(t->time.tm_mday); | |
282 | alarm[5] = bin2bcd(t->time.tm_mon + 1); | |
283 | ||
284 | err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH, | |
285 | sizeof(alarm), alarm); | |
286 | if (err < 0) { | |
287 | dev_err(&client->dev, "Unable to write alarm registers\n"); | |
288 | return -EIO; | |
289 | } | |
290 | ||
291 | if (t->enabled) { | |
292 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, | |
293 | (ABX8XX_IRQ_IM_1_4 | | |
294 | ABX8XX_IRQ_AIE)); | |
295 | if (err) | |
296 | return err; | |
297 | } | |
298 | ||
299 | return 0; | |
300 | } | |
301 | ||
59a8383a MJ |
302 | static int abx80x_rtc_set_autocalibration(struct device *dev, |
303 | int autocalibration) | |
304 | { | |
305 | struct i2c_client *client = to_i2c_client(dev); | |
306 | int retval, flags = 0; | |
307 | ||
308 | if ((autocalibration != 0) && (autocalibration != 1024) && | |
309 | (autocalibration != 512)) { | |
310 | dev_err(dev, "autocalibration value outside permitted range\n"); | |
311 | return -EINVAL; | |
312 | } | |
313 | ||
314 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); | |
315 | if (flags < 0) | |
316 | return flags; | |
317 | ||
318 | if (autocalibration == 0) { | |
319 | flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024); | |
320 | } else if (autocalibration == 1024) { | |
321 | /* 1024 autocalibration is 0x10 */ | |
322 | flags |= ABX8XX_OSC_ACAL_1024; | |
323 | flags &= ~(ABX8XX_OSC_ACAL_512); | |
324 | } else { | |
325 | /* 512 autocalibration is 0x11 */ | |
326 | flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512); | |
327 | } | |
328 | ||
329 | /* Unlock write access to Oscillator Control Register */ | |
330 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, | |
331 | ABX8XX_CFG_KEY_OSC); | |
332 | if (retval < 0) { | |
333 | dev_err(dev, "Failed to write CONFIG_KEY register\n"); | |
334 | return retval; | |
335 | } | |
336 | ||
337 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); | |
338 | ||
339 | return retval; | |
340 | } | |
341 | ||
342 | static int abx80x_rtc_get_autocalibration(struct device *dev) | |
343 | { | |
344 | struct i2c_client *client = to_i2c_client(dev); | |
345 | int flags = 0, autocalibration; | |
346 | ||
347 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); | |
348 | if (flags < 0) | |
349 | return flags; | |
350 | ||
351 | if (flags & ABX8XX_OSC_ACAL_512) | |
352 | autocalibration = 512; | |
353 | else if (flags & ABX8XX_OSC_ACAL_1024) | |
354 | autocalibration = 1024; | |
355 | else | |
356 | autocalibration = 0; | |
357 | ||
358 | return autocalibration; | |
359 | } | |
360 | ||
361 | static ssize_t autocalibration_store(struct device *dev, | |
362 | struct device_attribute *attr, | |
363 | const char *buf, size_t count) | |
364 | { | |
365 | int retval; | |
366 | unsigned long autocalibration = 0; | |
367 | ||
368 | retval = kstrtoul(buf, 10, &autocalibration); | |
369 | if (retval < 0) { | |
370 | dev_err(dev, "Failed to store RTC autocalibration attribute\n"); | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | retval = abx80x_rtc_set_autocalibration(dev, autocalibration); | |
375 | ||
376 | return retval ? retval : count; | |
377 | } | |
378 | ||
379 | static ssize_t autocalibration_show(struct device *dev, | |
380 | struct device_attribute *attr, char *buf) | |
381 | { | |
382 | int autocalibration = 0; | |
383 | ||
384 | autocalibration = abx80x_rtc_get_autocalibration(dev); | |
385 | if (autocalibration < 0) { | |
386 | dev_err(dev, "Failed to read RTC autocalibration\n"); | |
387 | sprintf(buf, "0\n"); | |
388 | return autocalibration; | |
389 | } | |
390 | ||
391 | return sprintf(buf, "%d\n", autocalibration); | |
392 | } | |
393 | ||
394 | static DEVICE_ATTR_RW(autocalibration); | |
395 | ||
396 | static ssize_t oscillator_store(struct device *dev, | |
397 | struct device_attribute *attr, | |
398 | const char *buf, size_t count) | |
399 | { | |
400 | struct i2c_client *client = to_i2c_client(dev); | |
401 | int retval, flags, rc_mode = 0; | |
402 | ||
403 | if (strncmp(buf, "rc", 2) == 0) { | |
404 | rc_mode = 1; | |
405 | } else if (strncmp(buf, "xtal", 4) == 0) { | |
406 | rc_mode = 0; | |
407 | } else { | |
408 | dev_err(dev, "Oscillator selection value outside permitted ones\n"); | |
409 | return -EINVAL; | |
410 | } | |
411 | ||
412 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); | |
413 | if (flags < 0) | |
414 | return flags; | |
415 | ||
416 | if (rc_mode == 0) | |
417 | flags &= ~(ABX8XX_OSC_OSEL); | |
418 | else | |
419 | flags |= (ABX8XX_OSC_OSEL); | |
420 | ||
421 | /* Unlock write access on Oscillator Control register */ | |
422 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, | |
423 | ABX8XX_CFG_KEY_OSC); | |
424 | if (retval < 0) { | |
425 | dev_err(dev, "Failed to write CONFIG_KEY register\n"); | |
426 | return retval; | |
427 | } | |
428 | ||
429 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); | |
430 | if (retval < 0) { | |
431 | dev_err(dev, "Failed to write Oscillator Control register\n"); | |
432 | return retval; | |
433 | } | |
434 | ||
435 | return retval ? retval : count; | |
436 | } | |
437 | ||
438 | static ssize_t oscillator_show(struct device *dev, | |
439 | struct device_attribute *attr, char *buf) | |
440 | { | |
441 | int rc_mode = 0; | |
442 | struct i2c_client *client = to_i2c_client(dev); | |
443 | ||
444 | rc_mode = abx80x_is_rc_mode(client); | |
445 | ||
446 | if (rc_mode < 0) { | |
447 | dev_err(dev, "Failed to read RTC oscillator selection\n"); | |
448 | sprintf(buf, "\n"); | |
449 | return rc_mode; | |
450 | } | |
451 | ||
452 | if (rc_mode) | |
453 | return sprintf(buf, "rc\n"); | |
454 | else | |
455 | return sprintf(buf, "xtal\n"); | |
456 | } | |
457 | ||
458 | static DEVICE_ATTR_RW(oscillator); | |
459 | ||
460 | static struct attribute *rtc_calib_attrs[] = { | |
461 | &dev_attr_autocalibration.attr, | |
462 | &dev_attr_oscillator.attr, | |
463 | NULL, | |
464 | }; | |
465 | ||
466 | static const struct attribute_group rtc_calib_attr_group = { | |
467 | .attrs = rtc_calib_attrs, | |
468 | }; | |
469 | ||
718a820a AB |
470 | static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled) |
471 | { | |
472 | struct i2c_client *client = to_i2c_client(dev); | |
473 | int err; | |
474 | ||
475 | if (enabled) | |
476 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, | |
477 | (ABX8XX_IRQ_IM_1_4 | | |
478 | ABX8XX_IRQ_AIE)); | |
479 | else | |
480 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, | |
481 | ABX8XX_IRQ_IM_1_4); | |
482 | return err; | |
483 | } | |
484 | ||
4d61ff6b PDM |
485 | static const struct rtc_class_ops abx80x_rtc_ops = { |
486 | .read_time = abx80x_rtc_read_time, | |
487 | .set_time = abx80x_rtc_set_time, | |
718a820a AB |
488 | .read_alarm = abx80x_read_alarm, |
489 | .set_alarm = abx80x_set_alarm, | |
490 | .alarm_irq_enable = abx80x_alarm_irq_enable, | |
4d61ff6b PDM |
491 | }; |
492 | ||
493 | static int abx80x_dt_trickle_cfg(struct device_node *np) | |
494 | { | |
495 | const char *diode; | |
496 | int trickle_cfg = 0; | |
497 | int i, ret; | |
498 | u32 tmp; | |
499 | ||
500 | ret = of_property_read_string(np, "abracon,tc-diode", &diode); | |
501 | if (ret) | |
502 | return ret; | |
503 | ||
504 | if (!strcmp(diode, "standard")) | |
505 | trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE; | |
506 | else if (!strcmp(diode, "schottky")) | |
507 | trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE; | |
508 | else | |
509 | return -EINVAL; | |
510 | ||
511 | ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp); | |
512 | if (ret) | |
513 | return ret; | |
514 | ||
515 | for (i = 0; i < sizeof(trickle_resistors); i++) | |
516 | if (trickle_resistors[i] == tmp) | |
517 | break; | |
518 | ||
519 | if (i == sizeof(trickle_resistors)) | |
520 | return -EINVAL; | |
521 | ||
522 | return (trickle_cfg | i); | |
523 | } | |
524 | ||
59a8383a MJ |
525 | static void rtc_calib_remove_sysfs_group(void *_dev) |
526 | { | |
527 | struct device *dev = _dev; | |
528 | ||
529 | sysfs_remove_group(&dev->kobj, &rtc_calib_attr_group); | |
530 | } | |
531 | ||
4d61ff6b PDM |
532 | static int abx80x_probe(struct i2c_client *client, |
533 | const struct i2c_device_id *id) | |
534 | { | |
535 | struct device_node *np = client->dev.of_node; | |
536 | struct rtc_device *rtc; | |
537 | int i, data, err, trickle_cfg = -EINVAL; | |
538 | char buf[7]; | |
539 | unsigned int part = id->driver_data; | |
540 | unsigned int partnumber; | |
541 | unsigned int majrev, minrev; | |
542 | unsigned int lot; | |
543 | unsigned int wafer; | |
544 | unsigned int uid; | |
545 | ||
546 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) | |
547 | return -ENODEV; | |
548 | ||
549 | err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0, | |
550 | sizeof(buf), buf); | |
551 | if (err < 0) { | |
552 | dev_err(&client->dev, "Unable to read partnumber\n"); | |
553 | return -EIO; | |
554 | } | |
555 | ||
556 | partnumber = (buf[0] << 8) | buf[1]; | |
557 | majrev = buf[2] >> 3; | |
558 | minrev = buf[2] & 0x7; | |
559 | lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3]; | |
560 | uid = ((buf[4] & 0x7f) << 8) | buf[5]; | |
561 | wafer = (buf[6] & 0x7c) >> 2; | |
562 | dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n", | |
563 | partnumber, majrev, minrev, lot, wafer, uid); | |
564 | ||
565 | data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1); | |
566 | if (data < 0) { | |
567 | dev_err(&client->dev, "Unable to read control register\n"); | |
568 | return -EIO; | |
569 | } | |
570 | ||
571 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1, | |
718a820a AB |
572 | ((data & ~(ABX8XX_CTRL_12_24 | |
573 | ABX8XX_CTRL_ARST)) | | |
4d61ff6b PDM |
574 | ABX8XX_CTRL_WRITE)); |
575 | if (err < 0) { | |
576 | dev_err(&client->dev, "Unable to write control register\n"); | |
577 | return -EIO; | |
578 | } | |
579 | ||
580 | /* part autodetection */ | |
581 | if (part == ABX80X) { | |
582 | for (i = 0; abx80x_caps[i].pn; i++) | |
583 | if (partnumber == abx80x_caps[i].pn) | |
584 | break; | |
585 | if (abx80x_caps[i].pn == 0) { | |
586 | dev_err(&client->dev, "Unknown part: %04x\n", | |
587 | partnumber); | |
588 | return -EINVAL; | |
589 | } | |
590 | part = i; | |
591 | } | |
592 | ||
593 | if (partnumber != abx80x_caps[part].pn) { | |
594 | dev_err(&client->dev, "partnumber mismatch %04x != %04x\n", | |
595 | partnumber, abx80x_caps[part].pn); | |
596 | return -EINVAL; | |
597 | } | |
598 | ||
599 | if (np && abx80x_caps[part].has_tc) | |
600 | trickle_cfg = abx80x_dt_trickle_cfg(np); | |
601 | ||
602 | if (trickle_cfg > 0) { | |
603 | dev_info(&client->dev, "Enabling trickle charger: %02x\n", | |
604 | trickle_cfg); | |
605 | abx80x_enable_trickle_charger(client, trickle_cfg); | |
606 | } | |
607 | ||
718a820a AB |
608 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL, |
609 | BIT(2)); | |
610 | if (err) | |
611 | return err; | |
612 | ||
9360a6a8 | 613 | rtc = devm_rtc_allocate_device(&client->dev); |
4d61ff6b PDM |
614 | if (IS_ERR(rtc)) |
615 | return PTR_ERR(rtc); | |
616 | ||
9360a6a8 AB |
617 | rtc->ops = &abx80x_rtc_ops; |
618 | ||
4d61ff6b PDM |
619 | i2c_set_clientdata(client, rtc); |
620 | ||
718a820a AB |
621 | if (client->irq > 0) { |
622 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); | |
623 | err = devm_request_threaded_irq(&client->dev, client->irq, NULL, | |
624 | abx80x_handle_irq, | |
625 | IRQF_SHARED | IRQF_ONESHOT, | |
626 | "abx8xx", | |
627 | client); | |
628 | if (err) { | |
629 | dev_err(&client->dev, "unable to request IRQ, alarms disabled\n"); | |
630 | client->irq = 0; | |
631 | } | |
632 | } | |
633 | ||
59a8383a MJ |
634 | /* Export sysfs entries */ |
635 | err = sysfs_create_group(&(&client->dev)->kobj, &rtc_calib_attr_group); | |
636 | if (err) { | |
637 | dev_err(&client->dev, "Failed to create sysfs group: %d\n", | |
638 | err); | |
639 | return err; | |
640 | } | |
641 | ||
d8cac8d9 SM |
642 | err = devm_add_action_or_reset(&client->dev, |
643 | rtc_calib_remove_sysfs_group, | |
644 | &client->dev); | |
9da32ba6 | 645 | if (err) { |
59a8383a MJ |
646 | dev_err(&client->dev, |
647 | "Failed to add sysfs cleanup action: %d\n", | |
648 | err); | |
9da32ba6 AB |
649 | return err; |
650 | } | |
651 | ||
652 | err = rtc_register_device(rtc); | |
59a8383a | 653 | |
d8cac8d9 | 654 | return err; |
4d61ff6b PDM |
655 | } |
656 | ||
657 | static int abx80x_remove(struct i2c_client *client) | |
658 | { | |
659 | return 0; | |
660 | } | |
661 | ||
662 | static const struct i2c_device_id abx80x_id[] = { | |
663 | { "abx80x", ABX80X }, | |
664 | { "ab0801", AB0801 }, | |
665 | { "ab0803", AB0803 }, | |
666 | { "ab0804", AB0804 }, | |
667 | { "ab0805", AB0805 }, | |
668 | { "ab1801", AB1801 }, | |
669 | { "ab1803", AB1803 }, | |
670 | { "ab1804", AB1804 }, | |
671 | { "ab1805", AB1805 }, | |
fca733a1 | 672 | { "rv1805", AB1805 }, |
4d61ff6b PDM |
673 | { } |
674 | }; | |
675 | MODULE_DEVICE_TABLE(i2c, abx80x_id); | |
676 | ||
677 | static struct i2c_driver abx80x_driver = { | |
678 | .driver = { | |
679 | .name = "rtc-abx80x", | |
680 | }, | |
681 | .probe = abx80x_probe, | |
682 | .remove = abx80x_remove, | |
683 | .id_table = abx80x_id, | |
684 | }; | |
685 | ||
686 | module_i2c_driver(abx80x_driver); | |
687 | ||
688 | MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>"); | |
689 | MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); | |
690 | MODULE_DESCRIPTION("Abracon ABX80X RTC driver"); | |
691 | MODULE_LICENSE("GPL v2"); |