Commit | Line | Data |
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2fcdf5fd | 1 | // SPDX-License-Identifier: GPL-2.0 |
4d61ff6b PDM |
2 | /* |
3 | * A driver for the I2C members of the Abracon AB x8xx RTC family, | |
4 | * and compatible: AB 1805 and AB 0805 | |
5 | * | |
6 | * Copyright 2014-2015 Macq S.A. | |
7 | * | |
8 | * Author: Philippe De Muyter <phdm@macqel.be> | |
7d1e5bfe | 9 | * Author: Alexandre Belloni <alexandre.belloni@bootlin.com> |
4d61ff6b | 10 | * |
4d61ff6b PDM |
11 | */ |
12 | ||
13 | #include <linux/bcd.h> | |
14 | #include <linux/i2c.h> | |
15 | #include <linux/module.h> | |
ac363ace | 16 | #include <linux/of_device.h> |
4d61ff6b | 17 | #include <linux/rtc.h> |
749e36d0 | 18 | #include <linux/watchdog.h> |
4d61ff6b PDM |
19 | |
20 | #define ABX8XX_REG_HTH 0x00 | |
21 | #define ABX8XX_REG_SC 0x01 | |
22 | #define ABX8XX_REG_MN 0x02 | |
23 | #define ABX8XX_REG_HR 0x03 | |
24 | #define ABX8XX_REG_DA 0x04 | |
25 | #define ABX8XX_REG_MO 0x05 | |
26 | #define ABX8XX_REG_YR 0x06 | |
27 | #define ABX8XX_REG_WD 0x07 | |
28 | ||
718a820a AB |
29 | #define ABX8XX_REG_AHTH 0x08 |
30 | #define ABX8XX_REG_ASC 0x09 | |
31 | #define ABX8XX_REG_AMN 0x0a | |
32 | #define ABX8XX_REG_AHR 0x0b | |
33 | #define ABX8XX_REG_ADA 0x0c | |
34 | #define ABX8XX_REG_AMO 0x0d | |
35 | #define ABX8XX_REG_AWD 0x0e | |
36 | ||
37 | #define ABX8XX_REG_STATUS 0x0f | |
38 | #define ABX8XX_STATUS_AF BIT(2) | |
ffe1c5a2 | 39 | #define ABX8XX_STATUS_BLF BIT(4) |
749e36d0 | 40 | #define ABX8XX_STATUS_WDT BIT(6) |
718a820a | 41 | |
4d61ff6b | 42 | #define ABX8XX_REG_CTRL1 0x10 |
5f1b2f77 | 43 | #define ABX8XX_CTRL_WRITE BIT(0) |
718a820a | 44 | #define ABX8XX_CTRL_ARST BIT(2) |
4d61ff6b PDM |
45 | #define ABX8XX_CTRL_12_24 BIT(6) |
46 | ||
75455e25 MV |
47 | #define ABX8XX_REG_CTRL2 0x11 |
48 | #define ABX8XX_CTRL2_RSVD BIT(5) | |
49 | ||
718a820a AB |
50 | #define ABX8XX_REG_IRQ 0x12 |
51 | #define ABX8XX_IRQ_AIE BIT(2) | |
52 | #define ABX8XX_IRQ_IM_1_4 (0x3 << 5) | |
53 | ||
54 | #define ABX8XX_REG_CD_TIMER_CTL 0x18 | |
55 | ||
59a8383a MJ |
56 | #define ABX8XX_REG_OSC 0x1c |
57 | #define ABX8XX_OSC_FOS BIT(3) | |
58 | #define ABX8XX_OSC_BOS BIT(4) | |
59 | #define ABX8XX_OSC_ACAL_512 BIT(5) | |
60 | #define ABX8XX_OSC_ACAL_1024 BIT(6) | |
61 | ||
62 | #define ABX8XX_OSC_OSEL BIT(7) | |
63 | ||
64 | #define ABX8XX_REG_OSS 0x1d | |
ee087744 | 65 | #define ABX8XX_OSS_OF BIT(1) |
59a8383a MJ |
66 | #define ABX8XX_OSS_OMODE BIT(4) |
67 | ||
749e36d0 JG |
68 | #define ABX8XX_REG_WDT 0x1b |
69 | #define ABX8XX_WDT_WDS BIT(7) | |
70 | #define ABX8XX_WDT_BMB_MASK 0x7c | |
71 | #define ABX8XX_WDT_BMB_SHIFT 2 | |
72 | #define ABX8XX_WDT_MAX_TIME (ABX8XX_WDT_BMB_MASK >> ABX8XX_WDT_BMB_SHIFT) | |
73 | #define ABX8XX_WDT_WRB_MASK 0x03 | |
74 | #define ABX8XX_WDT_WRB_1HZ 0x02 | |
75 | ||
4d61ff6b | 76 | #define ABX8XX_REG_CFG_KEY 0x1f |
59a8383a | 77 | #define ABX8XX_CFG_KEY_OSC 0xa1 |
4d61ff6b PDM |
78 | #define ABX8XX_CFG_KEY_MISC 0x9d |
79 | ||
80 | #define ABX8XX_REG_ID0 0x28 | |
81 | ||
75455e25 MV |
82 | #define ABX8XX_REG_OUT_CTRL 0x30 |
83 | #define ABX8XX_OUT_CTRL_EXDS BIT(4) | |
84 | ||
4d61ff6b PDM |
85 | #define ABX8XX_REG_TRICKLE 0x20 |
86 | #define ABX8XX_TRICKLE_CHARGE_ENABLE 0xa0 | |
87 | #define ABX8XX_TRICKLE_STANDARD_DIODE 0x8 | |
88 | #define ABX8XX_TRICKLE_SCHOTTKY_DIODE 0x4 | |
89 | ||
90 | static u8 trickle_resistors[] = {0, 3, 6, 11}; | |
91 | ||
92 | enum abx80x_chip {AB0801, AB0803, AB0804, AB0805, | |
75455e25 | 93 | AB1801, AB1803, AB1804, AB1805, RV1805, ABX80X}; |
4d61ff6b PDM |
94 | |
95 | struct abx80x_cap { | |
96 | u16 pn; | |
97 | bool has_tc; | |
749e36d0 | 98 | bool has_wdog; |
4d61ff6b PDM |
99 | }; |
100 | ||
101 | static struct abx80x_cap abx80x_caps[] = { | |
102 | [AB0801] = {.pn = 0x0801}, | |
103 | [AB0803] = {.pn = 0x0803}, | |
749e36d0 JG |
104 | [AB0804] = {.pn = 0x0804, .has_tc = true, .has_wdog = true}, |
105 | [AB0805] = {.pn = 0x0805, .has_tc = true, .has_wdog = true}, | |
4d61ff6b PDM |
106 | [AB1801] = {.pn = 0x1801}, |
107 | [AB1803] = {.pn = 0x1803}, | |
749e36d0 JG |
108 | [AB1804] = {.pn = 0x1804, .has_tc = true, .has_wdog = true}, |
109 | [AB1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true}, | |
75455e25 | 110 | [RV1805] = {.pn = 0x1805, .has_tc = true, .has_wdog = true}, |
4d61ff6b PDM |
111 | [ABX80X] = {.pn = 0} |
112 | }; | |
113 | ||
af69f9a7 JG |
114 | struct abx80x_priv { |
115 | struct rtc_device *rtc; | |
116 | struct i2c_client *client; | |
749e36d0 | 117 | struct watchdog_device wdog; |
af69f9a7 JG |
118 | }; |
119 | ||
59a8383a MJ |
120 | static int abx80x_is_rc_mode(struct i2c_client *client) |
121 | { | |
122 | int flags = 0; | |
123 | ||
124 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); | |
125 | if (flags < 0) { | |
126 | dev_err(&client->dev, | |
127 | "Failed to read autocalibration attribute\n"); | |
128 | return flags; | |
129 | } | |
130 | ||
131 | return (flags & ABX8XX_OSS_OMODE) ? 1 : 0; | |
132 | } | |
133 | ||
4d61ff6b PDM |
134 | static int abx80x_enable_trickle_charger(struct i2c_client *client, |
135 | u8 trickle_cfg) | |
136 | { | |
137 | int err; | |
138 | ||
139 | /* | |
140 | * Write the configuration key register to enable access to the Trickle | |
141 | * register | |
142 | */ | |
143 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, | |
144 | ABX8XX_CFG_KEY_MISC); | |
145 | if (err < 0) { | |
146 | dev_err(&client->dev, "Unable to write configuration key\n"); | |
147 | return -EIO; | |
148 | } | |
149 | ||
150 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_TRICKLE, | |
151 | ABX8XX_TRICKLE_CHARGE_ENABLE | | |
152 | trickle_cfg); | |
153 | if (err < 0) { | |
154 | dev_err(&client->dev, "Unable to write trickle register\n"); | |
155 | return -EIO; | |
156 | } | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int abx80x_rtc_read_time(struct device *dev, struct rtc_time *tm) | |
162 | { | |
163 | struct i2c_client *client = to_i2c_client(dev); | |
164 | unsigned char buf[8]; | |
ee087744 MJ |
165 | int err, flags, rc_mode = 0; |
166 | ||
167 | /* Read the Oscillator Failure only in XT mode */ | |
168 | rc_mode = abx80x_is_rc_mode(client); | |
169 | if (rc_mode < 0) | |
170 | return rc_mode; | |
171 | ||
172 | if (!rc_mode) { | |
173 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); | |
174 | if (flags < 0) | |
175 | return flags; | |
176 | ||
177 | if (flags & ABX8XX_OSS_OF) { | |
178 | dev_err(dev, "Oscillator failure, data is invalid.\n"); | |
179 | return -EINVAL; | |
180 | } | |
181 | } | |
4d61ff6b PDM |
182 | |
183 | err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_HTH, | |
184 | sizeof(buf), buf); | |
185 | if (err < 0) { | |
186 | dev_err(&client->dev, "Unable to read date\n"); | |
187 | return -EIO; | |
188 | } | |
189 | ||
190 | tm->tm_sec = bcd2bin(buf[ABX8XX_REG_SC] & 0x7F); | |
191 | tm->tm_min = bcd2bin(buf[ABX8XX_REG_MN] & 0x7F); | |
192 | tm->tm_hour = bcd2bin(buf[ABX8XX_REG_HR] & 0x3F); | |
193 | tm->tm_wday = buf[ABX8XX_REG_WD] & 0x7; | |
194 | tm->tm_mday = bcd2bin(buf[ABX8XX_REG_DA] & 0x3F); | |
195 | tm->tm_mon = bcd2bin(buf[ABX8XX_REG_MO] & 0x1F) - 1; | |
196 | tm->tm_year = bcd2bin(buf[ABX8XX_REG_YR]) + 100; | |
197 | ||
fbfd36fd | 198 | return 0; |
4d61ff6b PDM |
199 | } |
200 | ||
201 | static int abx80x_rtc_set_time(struct device *dev, struct rtc_time *tm) | |
202 | { | |
203 | struct i2c_client *client = to_i2c_client(dev); | |
204 | unsigned char buf[8]; | |
ee087744 | 205 | int err, flags; |
4d61ff6b PDM |
206 | |
207 | if (tm->tm_year < 100) | |
208 | return -EINVAL; | |
209 | ||
210 | buf[ABX8XX_REG_HTH] = 0; | |
211 | buf[ABX8XX_REG_SC] = bin2bcd(tm->tm_sec); | |
212 | buf[ABX8XX_REG_MN] = bin2bcd(tm->tm_min); | |
213 | buf[ABX8XX_REG_HR] = bin2bcd(tm->tm_hour); | |
214 | buf[ABX8XX_REG_DA] = bin2bcd(tm->tm_mday); | |
215 | buf[ABX8XX_REG_MO] = bin2bcd(tm->tm_mon + 1); | |
216 | buf[ABX8XX_REG_YR] = bin2bcd(tm->tm_year - 100); | |
217 | buf[ABX8XX_REG_WD] = tm->tm_wday; | |
218 | ||
219 | err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_HTH, | |
220 | sizeof(buf), buf); | |
221 | if (err < 0) { | |
222 | dev_err(&client->dev, "Unable to write to date registers\n"); | |
223 | return -EIO; | |
224 | } | |
225 | ||
ee087744 MJ |
226 | /* Clear the OF bit of Oscillator Status Register */ |
227 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSS); | |
228 | if (flags < 0) | |
229 | return flags; | |
230 | ||
231 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSS, | |
232 | flags & ~ABX8XX_OSS_OF); | |
233 | if (err < 0) { | |
234 | dev_err(&client->dev, "Unable to write oscillator status register\n"); | |
235 | return err; | |
236 | } | |
237 | ||
4d61ff6b PDM |
238 | return 0; |
239 | } | |
240 | ||
718a820a AB |
241 | static irqreturn_t abx80x_handle_irq(int irq, void *dev_id) |
242 | { | |
243 | struct i2c_client *client = dev_id; | |
af69f9a7 JG |
244 | struct abx80x_priv *priv = i2c_get_clientdata(client); |
245 | struct rtc_device *rtc = priv->rtc; | |
718a820a AB |
246 | int status; |
247 | ||
248 | status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); | |
249 | if (status < 0) | |
250 | return IRQ_NONE; | |
251 | ||
252 | if (status & ABX8XX_STATUS_AF) | |
253 | rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF); | |
254 | ||
749e36d0 JG |
255 | /* |
256 | * It is unclear if we'll get an interrupt before the external | |
257 | * reset kicks in. | |
258 | */ | |
259 | if (status & ABX8XX_STATUS_WDT) | |
260 | dev_alert(&client->dev, "watchdog timeout interrupt.\n"); | |
261 | ||
718a820a AB |
262 | i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); |
263 | ||
264 | return IRQ_HANDLED; | |
265 | } | |
266 | ||
267 | static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t) | |
268 | { | |
269 | struct i2c_client *client = to_i2c_client(dev); | |
270 | unsigned char buf[7]; | |
271 | ||
272 | int irq_mask, err; | |
273 | ||
274 | if (client->irq <= 0) | |
275 | return -EINVAL; | |
276 | ||
277 | err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC, | |
278 | sizeof(buf), buf); | |
279 | if (err) | |
280 | return err; | |
281 | ||
282 | irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ); | |
283 | if (irq_mask < 0) | |
284 | return irq_mask; | |
285 | ||
286 | t->time.tm_sec = bcd2bin(buf[0] & 0x7F); | |
287 | t->time.tm_min = bcd2bin(buf[1] & 0x7F); | |
288 | t->time.tm_hour = bcd2bin(buf[2] & 0x3F); | |
289 | t->time.tm_mday = bcd2bin(buf[3] & 0x3F); | |
290 | t->time.tm_mon = bcd2bin(buf[4] & 0x1F) - 1; | |
291 | t->time.tm_wday = buf[5] & 0x7; | |
292 | ||
293 | t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE); | |
294 | t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled; | |
295 | ||
296 | return err; | |
297 | } | |
298 | ||
299 | static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t) | |
300 | { | |
301 | struct i2c_client *client = to_i2c_client(dev); | |
302 | u8 alarm[6]; | |
303 | int err; | |
304 | ||
305 | if (client->irq <= 0) | |
306 | return -EINVAL; | |
307 | ||
308 | alarm[0] = 0x0; | |
309 | alarm[1] = bin2bcd(t->time.tm_sec); | |
310 | alarm[2] = bin2bcd(t->time.tm_min); | |
311 | alarm[3] = bin2bcd(t->time.tm_hour); | |
312 | alarm[4] = bin2bcd(t->time.tm_mday); | |
313 | alarm[5] = bin2bcd(t->time.tm_mon + 1); | |
314 | ||
315 | err = i2c_smbus_write_i2c_block_data(client, ABX8XX_REG_AHTH, | |
316 | sizeof(alarm), alarm); | |
317 | if (err < 0) { | |
318 | dev_err(&client->dev, "Unable to write alarm registers\n"); | |
319 | return -EIO; | |
320 | } | |
321 | ||
322 | if (t->enabled) { | |
323 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, | |
324 | (ABX8XX_IRQ_IM_1_4 | | |
325 | ABX8XX_IRQ_AIE)); | |
326 | if (err) | |
327 | return err; | |
328 | } | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
59a8383a MJ |
333 | static int abx80x_rtc_set_autocalibration(struct device *dev, |
334 | int autocalibration) | |
335 | { | |
336 | struct i2c_client *client = to_i2c_client(dev); | |
337 | int retval, flags = 0; | |
338 | ||
339 | if ((autocalibration != 0) && (autocalibration != 1024) && | |
340 | (autocalibration != 512)) { | |
341 | dev_err(dev, "autocalibration value outside permitted range\n"); | |
342 | return -EINVAL; | |
343 | } | |
344 | ||
345 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); | |
346 | if (flags < 0) | |
347 | return flags; | |
348 | ||
349 | if (autocalibration == 0) { | |
350 | flags &= ~(ABX8XX_OSC_ACAL_512 | ABX8XX_OSC_ACAL_1024); | |
351 | } else if (autocalibration == 1024) { | |
352 | /* 1024 autocalibration is 0x10 */ | |
353 | flags |= ABX8XX_OSC_ACAL_1024; | |
354 | flags &= ~(ABX8XX_OSC_ACAL_512); | |
355 | } else { | |
356 | /* 512 autocalibration is 0x11 */ | |
357 | flags |= (ABX8XX_OSC_ACAL_1024 | ABX8XX_OSC_ACAL_512); | |
358 | } | |
359 | ||
360 | /* Unlock write access to Oscillator Control Register */ | |
361 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, | |
362 | ABX8XX_CFG_KEY_OSC); | |
363 | if (retval < 0) { | |
364 | dev_err(dev, "Failed to write CONFIG_KEY register\n"); | |
365 | return retval; | |
366 | } | |
367 | ||
368 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); | |
369 | ||
370 | return retval; | |
371 | } | |
372 | ||
373 | static int abx80x_rtc_get_autocalibration(struct device *dev) | |
374 | { | |
375 | struct i2c_client *client = to_i2c_client(dev); | |
376 | int flags = 0, autocalibration; | |
377 | ||
378 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); | |
379 | if (flags < 0) | |
380 | return flags; | |
381 | ||
382 | if (flags & ABX8XX_OSC_ACAL_512) | |
383 | autocalibration = 512; | |
384 | else if (flags & ABX8XX_OSC_ACAL_1024) | |
385 | autocalibration = 1024; | |
386 | else | |
387 | autocalibration = 0; | |
388 | ||
389 | return autocalibration; | |
390 | } | |
391 | ||
392 | static ssize_t autocalibration_store(struct device *dev, | |
393 | struct device_attribute *attr, | |
394 | const char *buf, size_t count) | |
395 | { | |
396 | int retval; | |
397 | unsigned long autocalibration = 0; | |
398 | ||
399 | retval = kstrtoul(buf, 10, &autocalibration); | |
400 | if (retval < 0) { | |
401 | dev_err(dev, "Failed to store RTC autocalibration attribute\n"); | |
402 | return -EINVAL; | |
403 | } | |
404 | ||
559e883e | 405 | retval = abx80x_rtc_set_autocalibration(dev->parent, autocalibration); |
59a8383a MJ |
406 | |
407 | return retval ? retval : count; | |
408 | } | |
409 | ||
410 | static ssize_t autocalibration_show(struct device *dev, | |
411 | struct device_attribute *attr, char *buf) | |
412 | { | |
413 | int autocalibration = 0; | |
414 | ||
559e883e | 415 | autocalibration = abx80x_rtc_get_autocalibration(dev->parent); |
59a8383a MJ |
416 | if (autocalibration < 0) { |
417 | dev_err(dev, "Failed to read RTC autocalibration\n"); | |
418 | sprintf(buf, "0\n"); | |
419 | return autocalibration; | |
420 | } | |
421 | ||
422 | return sprintf(buf, "%d\n", autocalibration); | |
423 | } | |
424 | ||
425 | static DEVICE_ATTR_RW(autocalibration); | |
426 | ||
427 | static ssize_t oscillator_store(struct device *dev, | |
428 | struct device_attribute *attr, | |
429 | const char *buf, size_t count) | |
430 | { | |
559e883e | 431 | struct i2c_client *client = to_i2c_client(dev->parent); |
59a8383a MJ |
432 | int retval, flags, rc_mode = 0; |
433 | ||
434 | if (strncmp(buf, "rc", 2) == 0) { | |
435 | rc_mode = 1; | |
436 | } else if (strncmp(buf, "xtal", 4) == 0) { | |
437 | rc_mode = 0; | |
438 | } else { | |
439 | dev_err(dev, "Oscillator selection value outside permitted ones\n"); | |
440 | return -EINVAL; | |
441 | } | |
442 | ||
443 | flags = i2c_smbus_read_byte_data(client, ABX8XX_REG_OSC); | |
444 | if (flags < 0) | |
445 | return flags; | |
446 | ||
447 | if (rc_mode == 0) | |
448 | flags &= ~(ABX8XX_OSC_OSEL); | |
449 | else | |
450 | flags |= (ABX8XX_OSC_OSEL); | |
451 | ||
452 | /* Unlock write access on Oscillator Control register */ | |
453 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, | |
454 | ABX8XX_CFG_KEY_OSC); | |
455 | if (retval < 0) { | |
456 | dev_err(dev, "Failed to write CONFIG_KEY register\n"); | |
457 | return retval; | |
458 | } | |
459 | ||
460 | retval = i2c_smbus_write_byte_data(client, ABX8XX_REG_OSC, flags); | |
461 | if (retval < 0) { | |
462 | dev_err(dev, "Failed to write Oscillator Control register\n"); | |
463 | return retval; | |
464 | } | |
465 | ||
466 | return retval ? retval : count; | |
467 | } | |
468 | ||
469 | static ssize_t oscillator_show(struct device *dev, | |
470 | struct device_attribute *attr, char *buf) | |
471 | { | |
472 | int rc_mode = 0; | |
559e883e | 473 | struct i2c_client *client = to_i2c_client(dev->parent); |
59a8383a MJ |
474 | |
475 | rc_mode = abx80x_is_rc_mode(client); | |
476 | ||
477 | if (rc_mode < 0) { | |
478 | dev_err(dev, "Failed to read RTC oscillator selection\n"); | |
479 | sprintf(buf, "\n"); | |
480 | return rc_mode; | |
481 | } | |
482 | ||
483 | if (rc_mode) | |
484 | return sprintf(buf, "rc\n"); | |
485 | else | |
486 | return sprintf(buf, "xtal\n"); | |
487 | } | |
488 | ||
489 | static DEVICE_ATTR_RW(oscillator); | |
490 | ||
491 | static struct attribute *rtc_calib_attrs[] = { | |
492 | &dev_attr_autocalibration.attr, | |
493 | &dev_attr_oscillator.attr, | |
494 | NULL, | |
495 | }; | |
496 | ||
497 | static const struct attribute_group rtc_calib_attr_group = { | |
498 | .attrs = rtc_calib_attrs, | |
499 | }; | |
500 | ||
718a820a AB |
501 | static int abx80x_alarm_irq_enable(struct device *dev, unsigned int enabled) |
502 | { | |
503 | struct i2c_client *client = to_i2c_client(dev); | |
504 | int err; | |
505 | ||
506 | if (enabled) | |
507 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, | |
508 | (ABX8XX_IRQ_IM_1_4 | | |
509 | ABX8XX_IRQ_AIE)); | |
510 | else | |
511 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_IRQ, | |
512 | ABX8XX_IRQ_IM_1_4); | |
513 | return err; | |
514 | } | |
515 | ||
ffe1c5a2 MV |
516 | static int abx80x_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) |
517 | { | |
518 | struct i2c_client *client = to_i2c_client(dev); | |
519 | int status, tmp; | |
520 | ||
521 | switch (cmd) { | |
522 | case RTC_VL_READ: | |
523 | status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); | |
524 | if (status < 0) | |
525 | return status; | |
526 | ||
9f05342a | 527 | tmp = status & ABX8XX_STATUS_BLF ? RTC_VL_BACKUP_LOW : 0; |
ffe1c5a2 | 528 | |
9f05342a | 529 | return put_user(tmp, (unsigned int __user *)arg); |
ffe1c5a2 MV |
530 | |
531 | case RTC_VL_CLR: | |
532 | status = i2c_smbus_read_byte_data(client, ABX8XX_REG_STATUS); | |
533 | if (status < 0) | |
534 | return status; | |
535 | ||
536 | status &= ~ABX8XX_STATUS_BLF; | |
537 | ||
538 | tmp = i2c_smbus_write_byte_data(client, ABX8XX_REG_STATUS, 0); | |
539 | if (tmp < 0) | |
540 | return tmp; | |
541 | ||
542 | return 0; | |
543 | ||
544 | default: | |
545 | return -ENOIOCTLCMD; | |
546 | } | |
547 | } | |
548 | ||
4d61ff6b PDM |
549 | static const struct rtc_class_ops abx80x_rtc_ops = { |
550 | .read_time = abx80x_rtc_read_time, | |
551 | .set_time = abx80x_rtc_set_time, | |
718a820a AB |
552 | .read_alarm = abx80x_read_alarm, |
553 | .set_alarm = abx80x_set_alarm, | |
554 | .alarm_irq_enable = abx80x_alarm_irq_enable, | |
ffe1c5a2 | 555 | .ioctl = abx80x_ioctl, |
4d61ff6b PDM |
556 | }; |
557 | ||
6e429f6b | 558 | static int abx80x_dt_trickle_cfg(struct i2c_client *client) |
4d61ff6b | 559 | { |
6e429f6b | 560 | struct device_node *np = client->dev.of_node; |
4d61ff6b PDM |
561 | const char *diode; |
562 | int trickle_cfg = 0; | |
563 | int i, ret; | |
564 | u32 tmp; | |
565 | ||
566 | ret = of_property_read_string(np, "abracon,tc-diode", &diode); | |
567 | if (ret) | |
568 | return ret; | |
569 | ||
6e429f6b | 570 | if (!strcmp(diode, "standard")) { |
4d61ff6b | 571 | trickle_cfg |= ABX8XX_TRICKLE_STANDARD_DIODE; |
6e429f6b | 572 | } else if (!strcmp(diode, "schottky")) { |
4d61ff6b | 573 | trickle_cfg |= ABX8XX_TRICKLE_SCHOTTKY_DIODE; |
6e429f6b KF |
574 | } else { |
575 | dev_dbg(&client->dev, "Invalid tc-diode value: %s\n", diode); | |
4d61ff6b | 576 | return -EINVAL; |
6e429f6b | 577 | } |
4d61ff6b PDM |
578 | |
579 | ret = of_property_read_u32(np, "abracon,tc-resistor", &tmp); | |
580 | if (ret) | |
581 | return ret; | |
582 | ||
583 | for (i = 0; i < sizeof(trickle_resistors); i++) | |
584 | if (trickle_resistors[i] == tmp) | |
585 | break; | |
586 | ||
6e429f6b KF |
587 | if (i == sizeof(trickle_resistors)) { |
588 | dev_dbg(&client->dev, "Invalid tc-resistor value: %u\n", tmp); | |
4d61ff6b | 589 | return -EINVAL; |
6e429f6b | 590 | } |
4d61ff6b PDM |
591 | |
592 | return (trickle_cfg | i); | |
593 | } | |
594 | ||
749e36d0 JG |
595 | #ifdef CONFIG_WATCHDOG |
596 | ||
597 | static inline u8 timeout_bits(unsigned int timeout) | |
598 | { | |
599 | return ((timeout << ABX8XX_WDT_BMB_SHIFT) & ABX8XX_WDT_BMB_MASK) | | |
600 | ABX8XX_WDT_WRB_1HZ; | |
601 | } | |
602 | ||
603 | static int __abx80x_wdog_set_timeout(struct watchdog_device *wdog, | |
604 | unsigned int timeout) | |
605 | { | |
606 | struct abx80x_priv *priv = watchdog_get_drvdata(wdog); | |
607 | u8 val = ABX8XX_WDT_WDS | timeout_bits(timeout); | |
608 | ||
609 | /* | |
610 | * Writing any timeout to the WDT register resets the watchdog timer. | |
611 | * Writing 0 disables it. | |
612 | */ | |
613 | return i2c_smbus_write_byte_data(priv->client, ABX8XX_REG_WDT, val); | |
614 | } | |
615 | ||
616 | static int abx80x_wdog_set_timeout(struct watchdog_device *wdog, | |
617 | unsigned int new_timeout) | |
618 | { | |
619 | int err = 0; | |
620 | ||
621 | if (watchdog_hw_running(wdog)) | |
622 | err = __abx80x_wdog_set_timeout(wdog, new_timeout); | |
623 | ||
624 | if (err == 0) | |
625 | wdog->timeout = new_timeout; | |
626 | ||
627 | return err; | |
628 | } | |
629 | ||
630 | static int abx80x_wdog_ping(struct watchdog_device *wdog) | |
631 | { | |
632 | return __abx80x_wdog_set_timeout(wdog, wdog->timeout); | |
633 | } | |
634 | ||
635 | static int abx80x_wdog_start(struct watchdog_device *wdog) | |
636 | { | |
637 | return __abx80x_wdog_set_timeout(wdog, wdog->timeout); | |
638 | } | |
639 | ||
640 | static int abx80x_wdog_stop(struct watchdog_device *wdog) | |
641 | { | |
642 | return __abx80x_wdog_set_timeout(wdog, 0); | |
643 | } | |
644 | ||
645 | static const struct watchdog_info abx80x_wdog_info = { | |
646 | .identity = "abx80x watchdog", | |
647 | .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, | |
648 | }; | |
649 | ||
650 | static const struct watchdog_ops abx80x_wdog_ops = { | |
651 | .owner = THIS_MODULE, | |
652 | .start = abx80x_wdog_start, | |
653 | .stop = abx80x_wdog_stop, | |
654 | .ping = abx80x_wdog_ping, | |
655 | .set_timeout = abx80x_wdog_set_timeout, | |
656 | }; | |
657 | ||
658 | static int abx80x_setup_watchdog(struct abx80x_priv *priv) | |
659 | { | |
660 | priv->wdog.parent = &priv->client->dev; | |
661 | priv->wdog.ops = &abx80x_wdog_ops; | |
662 | priv->wdog.info = &abx80x_wdog_info; | |
663 | priv->wdog.min_timeout = 1; | |
664 | priv->wdog.max_timeout = ABX8XX_WDT_MAX_TIME; | |
665 | priv->wdog.timeout = ABX8XX_WDT_MAX_TIME; | |
666 | ||
667 | watchdog_set_drvdata(&priv->wdog, priv); | |
668 | ||
669 | return devm_watchdog_register_device(&priv->client->dev, &priv->wdog); | |
670 | } | |
671 | #else | |
672 | static int abx80x_setup_watchdog(struct abx80x_priv *priv) | |
673 | { | |
674 | return 0; | |
675 | } | |
676 | #endif | |
677 | ||
4d61ff6b PDM |
678 | static int abx80x_probe(struct i2c_client *client, |
679 | const struct i2c_device_id *id) | |
680 | { | |
681 | struct device_node *np = client->dev.of_node; | |
af69f9a7 | 682 | struct abx80x_priv *priv; |
4d61ff6b PDM |
683 | int i, data, err, trickle_cfg = -EINVAL; |
684 | char buf[7]; | |
685 | unsigned int part = id->driver_data; | |
686 | unsigned int partnumber; | |
687 | unsigned int majrev, minrev; | |
688 | unsigned int lot; | |
689 | unsigned int wafer; | |
690 | unsigned int uid; | |
691 | ||
692 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) | |
693 | return -ENODEV; | |
694 | ||
695 | err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ID0, | |
696 | sizeof(buf), buf); | |
697 | if (err < 0) { | |
698 | dev_err(&client->dev, "Unable to read partnumber\n"); | |
699 | return -EIO; | |
700 | } | |
701 | ||
702 | partnumber = (buf[0] << 8) | buf[1]; | |
703 | majrev = buf[2] >> 3; | |
704 | minrev = buf[2] & 0x7; | |
705 | lot = ((buf[4] & 0x80) << 2) | ((buf[6] & 0x80) << 1) | buf[3]; | |
706 | uid = ((buf[4] & 0x7f) << 8) | buf[5]; | |
707 | wafer = (buf[6] & 0x7c) >> 2; | |
708 | dev_info(&client->dev, "model %04x, revision %u.%u, lot %x, wafer %x, uid %x\n", | |
709 | partnumber, majrev, minrev, lot, wafer, uid); | |
710 | ||
711 | data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL1); | |
712 | if (data < 0) { | |
713 | dev_err(&client->dev, "Unable to read control register\n"); | |
714 | return -EIO; | |
715 | } | |
716 | ||
717 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL1, | |
718a820a AB |
718 | ((data & ~(ABX8XX_CTRL_12_24 | |
719 | ABX8XX_CTRL_ARST)) | | |
4d61ff6b PDM |
720 | ABX8XX_CTRL_WRITE)); |
721 | if (err < 0) { | |
722 | dev_err(&client->dev, "Unable to write control register\n"); | |
723 | return -EIO; | |
724 | } | |
725 | ||
75455e25 MV |
726 | /* Configure RV1805 specifics */ |
727 | if (part == RV1805) { | |
728 | /* | |
729 | * Avoid accidentally entering test mode. This can happen | |
730 | * on the RV1805 in case the reserved bit 5 in control2 | |
731 | * register is set. RV-1805-C3 datasheet indicates that | |
732 | * the bit should be cleared in section 11h - Control2. | |
733 | */ | |
734 | data = i2c_smbus_read_byte_data(client, ABX8XX_REG_CTRL2); | |
735 | if (data < 0) { | |
736 | dev_err(&client->dev, | |
737 | "Unable to read control2 register\n"); | |
738 | return -EIO; | |
739 | } | |
740 | ||
741 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CTRL2, | |
742 | data & ~ABX8XX_CTRL2_RSVD); | |
743 | if (err < 0) { | |
744 | dev_err(&client->dev, | |
745 | "Unable to write control2 register\n"); | |
746 | return -EIO; | |
747 | } | |
748 | ||
749 | /* | |
750 | * Avoid extra power leakage. The RV1805 uses smaller | |
751 | * 10pin package and the EXTI input is not present. | |
752 | * Disable it to avoid leakage. | |
753 | */ | |
754 | data = i2c_smbus_read_byte_data(client, ABX8XX_REG_OUT_CTRL); | |
755 | if (data < 0) { | |
756 | dev_err(&client->dev, | |
757 | "Unable to read output control register\n"); | |
758 | return -EIO; | |
759 | } | |
760 | ||
761 | /* | |
762 | * Write the configuration key register to enable access to | |
763 | * the config2 register | |
764 | */ | |
765 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CFG_KEY, | |
766 | ABX8XX_CFG_KEY_MISC); | |
767 | if (err < 0) { | |
768 | dev_err(&client->dev, | |
769 | "Unable to write configuration key\n"); | |
770 | return -EIO; | |
771 | } | |
772 | ||
773 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_OUT_CTRL, | |
774 | data | ABX8XX_OUT_CTRL_EXDS); | |
775 | if (err < 0) { | |
776 | dev_err(&client->dev, | |
777 | "Unable to write output control register\n"); | |
778 | return -EIO; | |
779 | } | |
780 | } | |
781 | ||
4d61ff6b PDM |
782 | /* part autodetection */ |
783 | if (part == ABX80X) { | |
784 | for (i = 0; abx80x_caps[i].pn; i++) | |
785 | if (partnumber == abx80x_caps[i].pn) | |
786 | break; | |
787 | if (abx80x_caps[i].pn == 0) { | |
788 | dev_err(&client->dev, "Unknown part: %04x\n", | |
789 | partnumber); | |
790 | return -EINVAL; | |
791 | } | |
792 | part = i; | |
793 | } | |
794 | ||
795 | if (partnumber != abx80x_caps[part].pn) { | |
796 | dev_err(&client->dev, "partnumber mismatch %04x != %04x\n", | |
797 | partnumber, abx80x_caps[part].pn); | |
798 | return -EINVAL; | |
799 | } | |
800 | ||
801 | if (np && abx80x_caps[part].has_tc) | |
6e429f6b | 802 | trickle_cfg = abx80x_dt_trickle_cfg(client); |
4d61ff6b PDM |
803 | |
804 | if (trickle_cfg > 0) { | |
805 | dev_info(&client->dev, "Enabling trickle charger: %02x\n", | |
806 | trickle_cfg); | |
807 | abx80x_enable_trickle_charger(client, trickle_cfg); | |
808 | } | |
809 | ||
718a820a AB |
810 | err = i2c_smbus_write_byte_data(client, ABX8XX_REG_CD_TIMER_CTL, |
811 | BIT(2)); | |
812 | if (err) | |
813 | return err; | |
814 | ||
af69f9a7 JG |
815 | priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); |
816 | if (priv == NULL) | |
817 | return -ENOMEM; | |
818 | ||
819 | priv->rtc = devm_rtc_allocate_device(&client->dev); | |
820 | if (IS_ERR(priv->rtc)) | |
821 | return PTR_ERR(priv->rtc); | |
4d61ff6b | 822 | |
af69f9a7 JG |
823 | priv->rtc->ops = &abx80x_rtc_ops; |
824 | priv->client = client; | |
9360a6a8 | 825 | |
af69f9a7 | 826 | i2c_set_clientdata(client, priv); |
4d61ff6b | 827 | |
749e36d0 JG |
828 | if (abx80x_caps[part].has_wdog) { |
829 | err = abx80x_setup_watchdog(priv); | |
830 | if (err) | |
831 | return err; | |
832 | } | |
833 | ||
718a820a AB |
834 | if (client->irq > 0) { |
835 | dev_info(&client->dev, "IRQ %d supplied\n", client->irq); | |
836 | err = devm_request_threaded_irq(&client->dev, client->irq, NULL, | |
837 | abx80x_handle_irq, | |
838 | IRQF_SHARED | IRQF_ONESHOT, | |
839 | "abx8xx", | |
840 | client); | |
841 | if (err) { | |
842 | dev_err(&client->dev, "unable to request IRQ, alarms disabled\n"); | |
843 | client->irq = 0; | |
844 | } | |
845 | } | |
846 | ||
559e883e | 847 | err = rtc_add_group(priv->rtc, &rtc_calib_attr_group); |
59a8383a MJ |
848 | if (err) { |
849 | dev_err(&client->dev, "Failed to create sysfs group: %d\n", | |
850 | err); | |
851 | return err; | |
852 | } | |
853 | ||
559e883e | 854 | return rtc_register_device(priv->rtc); |
4d61ff6b PDM |
855 | } |
856 | ||
4d61ff6b PDM |
857 | static const struct i2c_device_id abx80x_id[] = { |
858 | { "abx80x", ABX80X }, | |
859 | { "ab0801", AB0801 }, | |
860 | { "ab0803", AB0803 }, | |
861 | { "ab0804", AB0804 }, | |
862 | { "ab0805", AB0805 }, | |
863 | { "ab1801", AB1801 }, | |
864 | { "ab1803", AB1803 }, | |
865 | { "ab1804", AB1804 }, | |
866 | { "ab1805", AB1805 }, | |
75455e25 | 867 | { "rv1805", RV1805 }, |
4d61ff6b PDM |
868 | { } |
869 | }; | |
870 | MODULE_DEVICE_TABLE(i2c, abx80x_id); | |
871 | ||
ac363ace KF |
872 | #ifdef CONFIG_OF |
873 | static const struct of_device_id abx80x_of_match[] = { | |
874 | { | |
875 | .compatible = "abracon,abx80x", | |
876 | .data = (void *)ABX80X | |
877 | }, | |
878 | { | |
879 | .compatible = "abracon,ab0801", | |
880 | .data = (void *)AB0801 | |
881 | }, | |
882 | { | |
883 | .compatible = "abracon,ab0803", | |
884 | .data = (void *)AB0803 | |
885 | }, | |
886 | { | |
887 | .compatible = "abracon,ab0804", | |
888 | .data = (void *)AB0804 | |
889 | }, | |
890 | { | |
891 | .compatible = "abracon,ab0805", | |
892 | .data = (void *)AB0805 | |
893 | }, | |
894 | { | |
895 | .compatible = "abracon,ab1801", | |
896 | .data = (void *)AB1801 | |
897 | }, | |
898 | { | |
899 | .compatible = "abracon,ab1803", | |
900 | .data = (void *)AB1803 | |
901 | }, | |
902 | { | |
903 | .compatible = "abracon,ab1804", | |
904 | .data = (void *)AB1804 | |
905 | }, | |
906 | { | |
907 | .compatible = "abracon,ab1805", | |
908 | .data = (void *)AB1805 | |
909 | }, | |
910 | { | |
911 | .compatible = "microcrystal,rv1805", | |
912 | .data = (void *)RV1805 | |
913 | }, | |
914 | { } | |
915 | }; | |
916 | MODULE_DEVICE_TABLE(of, abx80x_of_match); | |
917 | #endif | |
918 | ||
4d61ff6b PDM |
919 | static struct i2c_driver abx80x_driver = { |
920 | .driver = { | |
921 | .name = "rtc-abx80x", | |
ac363ace | 922 | .of_match_table = of_match_ptr(abx80x_of_match), |
4d61ff6b PDM |
923 | }, |
924 | .probe = abx80x_probe, | |
4d61ff6b PDM |
925 | .id_table = abx80x_id, |
926 | }; | |
927 | ||
928 | module_i2c_driver(abx80x_driver); | |
929 | ||
930 | MODULE_AUTHOR("Philippe De Muyter <phdm@macqel.be>"); | |
7d1e5bfe | 931 | MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>"); |
4d61ff6b PDM |
932 | MODULE_DESCRIPTION("Abracon ABX80X RTC driver"); |
933 | MODULE_LICENSE("GPL v2"); |