1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2022 Richtek Technology Corp.
4 *
5 * ChiYuan Huang <cy_huang@richtek.com>
6 */
7
8 #include <linux/bitops.h>
9 #include <linux/delay.h>
10 #include <linux/i2c.h>
11 #include <linux/kernel.h>
12 #include <linux/mod_devicetable.h>
13 #include <linux/module.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/property.h>
16 #include <linux/regmap.h>
17 #include <linux/sysfs.h>
18 #include <linux/types.h>
19 #include <linux/util_macros.h>
20
21 #include <linux/iio/buffer.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/trigger_consumer.h>
25 #include <linux/iio/triggered_buffer.h>
26
27 #define RTQ6056_REG_CONFIG 0x00
28 #define RTQ6056_REG_SHUNTVOLT 0x01
29 #define RTQ6056_REG_BUSVOLT 0x02
30 #define RTQ6056_REG_POWER 0x03
31 #define RTQ6056_REG_CURRENT 0x04
32 #define RTQ6056_REG_CALIBRATION 0x05
33 #define RTQ6056_REG_MASKENABLE 0x06
34 #define RTQ6056_REG_ALERTLIMIT 0x07
35 #define RTQ6056_REG_MANUFACTID 0xFE
36 #define RTQ6056_REG_DIEID 0xFF
37
38 #define RTQ6056_VENDOR_ID 0x1214
39 #define RTQ6056_DEFAULT_CONFIG 0x4127
40 #define RTQ6056_CONT_ALLON 7
41
42 #define RTQ6059_DEFAULT_CONFIG 0x3C47
43 #define RTQ6059_VBUS_LSB_OFFSET 3
44 #define RTQ6059_AVG_BASE 8
45
46 enum {
47 RTQ6056_CH_VSHUNT = 0,
48 RTQ6056_CH_VBUS,
49 RTQ6056_CH_POWER,
50 RTQ6056_CH_CURRENT,
51 RTQ6056_MAX_CHANNEL
52 };
53
54 /*
55 * The enum is to present the 0x00 CONFIG RG bitfield for the 16bit RG value
56 * field value order from LSB to MSB
57 * RTQ6053/6 is OPMODE->VSHUNTCT->VBUSCT->AVG->RESET
58 * RTQ6059 is OPMODE->SADC->BADC->PGA->RESET
59 */
60 enum {
61 F_OPMODE = 0,
62 F_VSHUNTCT,
63 F_RTQ6059_SADC = F_VSHUNTCT,
64 F_VBUSCT,
65 F_RTQ6059_BADC = F_VBUSCT,
66 F_AVG,
67 F_RTQ6059_PGA = F_AVG,
68 F_RESET,
69 F_MAX_FIELDS
70 };
71
72 struct rtq6056_priv;
73
74 struct richtek_dev_data {
75 bool fixed_samp_freq;
76 u8 vbus_offset;
77 int default_conv_time_us;
78 unsigned int default_config;
79 unsigned int calib_coefficient;
80 const int *avg_sample_list;
81 int avg_sample_list_length;
82 const struct reg_field *reg_fields;
83 const struct iio_chan_spec *channels;
84 int num_channels;
85 int (*read_scale)(struct iio_chan_spec const *ch, int *val, int *val2);
86 int (*set_average)(struct rtq6056_priv *priv, int val);
87 };
88
89 struct rtq6056_priv {
90 struct device *dev;
91 struct regmap *regmap;
92 struct regmap_field *rm_fields[F_MAX_FIELDS];
93 const struct richtek_dev_data *devdata;
94 u32 shunt_resistor_uohm;
95 int vshuntct_us;
96 int vbusct_us;
97 int avg_sample;
98 };
99
100 static const struct reg_field rtq6056_reg_fields[F_MAX_FIELDS] = {
101 [F_OPMODE] = REG_FIELD(RTQ6056_REG_CONFIG, 0, 2),
102 [F_VSHUNTCT] = REG_FIELD(RTQ6056_REG_CONFIG, 3, 5),
103 [F_VBUSCT] = REG_FIELD(RTQ6056_REG_CONFIG, 6, 8),
104 [F_AVG] = REG_FIELD(RTQ6056_REG_CONFIG, 9, 11),
105 [F_RESET] = REG_FIELD(RTQ6056_REG_CONFIG, 15, 15),
106 };
107
108 static const struct reg_field rtq6059_reg_fields[F_MAX_FIELDS] = {
109 [F_OPMODE] = REG_FIELD(RTQ6056_REG_CONFIG, 0, 2),
110 [F_RTQ6059_SADC] = REG_FIELD(RTQ6056_REG_CONFIG, 3, 6),
111 [F_RTQ6059_BADC] = REG_FIELD(RTQ6056_REG_CONFIG, 7, 10),
112 [F_RTQ6059_PGA] = REG_FIELD(RTQ6056_REG_CONFIG, 11, 12),
113 [F_RESET] = REG_FIELD(RTQ6056_REG_CONFIG, 15, 15),
114 };
115
116 static const struct iio_chan_spec rtq6056_channels[RTQ6056_MAX_CHANNEL + 1] = {
117 {
118 .type = IIO_VOLTAGE,
119 .indexed = 1,
120 .channel = 0,
121 .address = RTQ6056_REG_SHUNTVOLT,
122 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
123 BIT(IIO_CHAN_INFO_SCALE) |
124 BIT(IIO_CHAN_INFO_SAMP_FREQ),
125 .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
126 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
127 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
128 .scan_index = 0,
129 .scan_type = {
130 .sign = 's',
131 .realbits = 16,
132 .storagebits = 16,
133 .endianness = IIO_CPU,
134 },
135 },
136 {
137 .type = IIO_VOLTAGE,
138 .indexed = 1,
139 .channel = 1,
140 .address = RTQ6056_REG_BUSVOLT,
141 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
142 BIT(IIO_CHAN_INFO_SCALE) |
143 BIT(IIO_CHAN_INFO_SAMP_FREQ),
144 .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
145 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
146 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
147 .scan_index = 1,
148 .scan_type = {
149 .sign = 'u',
150 .realbits = 16,
151 .storagebits = 16,
152 .endianness = IIO_CPU,
153 },
154 },
155 {
156 .type = IIO_POWER,
157 .indexed = 1,
158 .channel = 2,
159 .address = RTQ6056_REG_POWER,
160 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
161 BIT(IIO_CHAN_INFO_SCALE) |
162 BIT(IIO_CHAN_INFO_SAMP_FREQ),
163 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
164 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
165 .scan_index = 2,
166 .scan_type = {
167 .sign = 'u',
168 .realbits = 16,
169 .storagebits = 16,
170 .endianness = IIO_CPU,
171 },
172 },
173 {
174 .type = IIO_CURRENT,
175 .indexed = 1,
176 .channel = 3,
177 .address = RTQ6056_REG_CURRENT,
178 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
179 BIT(IIO_CHAN_INFO_SAMP_FREQ),
180 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
181 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
182 .scan_index = 3,
183 .scan_type = {
184 .sign = 's',
185 .realbits = 16,
186 .storagebits = 16,
187 .endianness = IIO_CPU,
188 },
189 },
190 IIO_CHAN_SOFT_TIMESTAMP(RTQ6056_MAX_CHANNEL),
191 };
192
193 /*
194 * Difference between RTQ6056 and RTQ6059
195 * - Fixed sampling conversion time
196 * - Average sample numbers
197 * - Channel scale
198 * - calibration coefficient
199 */
200 static const struct iio_chan_spec rtq6059_channels[RTQ6056_MAX_CHANNEL + 1] = {
201 {
202 .type = IIO_VOLTAGE,
203 .indexed = 1,
204 .channel = 0,
205 .address = RTQ6056_REG_SHUNTVOLT,
206 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
207 BIT(IIO_CHAN_INFO_SCALE) |
208 BIT(IIO_CHAN_INFO_SAMP_FREQ),
209 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
210 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
211 .scan_index = 0,
212 .scan_type = {
213 .sign = 's',
214 .realbits = 16,
215 .storagebits = 16,
216 .endianness = IIO_CPU,
217 },
218 },
219 {
220 .type = IIO_VOLTAGE,
221 .indexed = 1,
222 .channel = 1,
223 .address = RTQ6056_REG_BUSVOLT,
224 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
225 BIT(IIO_CHAN_INFO_SCALE) |
226 BIT(IIO_CHAN_INFO_SAMP_FREQ),
227 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
228 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
229 .scan_index = 1,
230 .scan_type = {
231 .sign = 'u',
232 .realbits = 16,
233 .storagebits = 16,
234 .endianness = IIO_CPU,
235 },
236 },
237 {
238 .type = IIO_POWER,
239 .indexed = 1,
240 .channel = 2,
241 .address = RTQ6056_REG_POWER,
242 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
243 BIT(IIO_CHAN_INFO_SCALE) |
244 BIT(IIO_CHAN_INFO_SAMP_FREQ),
245 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
246 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
247 .scan_index = 2,
248 .scan_type = {
249 .sign = 'u',
250 .realbits = 16,
251 .storagebits = 16,
252 .endianness = IIO_CPU,
253 },
254 },
255 {
256 .type = IIO_CURRENT,
257 .indexed = 1,
258 .channel = 3,
259 .address = RTQ6056_REG_CURRENT,
260 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
261 BIT(IIO_CHAN_INFO_SAMP_FREQ),
262 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
263 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
264 .scan_index = 3,
265 .scan_type = {
266 .sign = 's',
267 .realbits = 16,
268 .storagebits = 16,
269 .endianness = IIO_CPU,
270 },
271 },
272 IIO_CHAN_SOFT_TIMESTAMP(RTQ6056_MAX_CHANNEL),
273 };
274
rtq6056_adc_read_channel(struct rtq6056_priv * priv,struct iio_chan_spec const * ch,int * val)275 static int rtq6056_adc_read_channel(struct rtq6056_priv *priv,
276 struct iio_chan_spec const *ch,
277 int *val)
278 {
279 const struct richtek_dev_data *devdata = priv->devdata;
280 struct device *dev = priv->dev;
281 unsigned int addr = ch->address;
282 unsigned int regval;
283 int ret;
284
285 pm_runtime_get_sync(dev);
286 ret = regmap_read(priv->regmap, addr, ®val);
287 pm_runtime_mark_last_busy(dev);
288 pm_runtime_put(dev);
289 if (ret)
290 return ret;
291
292 /* Power and VBUS is unsigned 16-bit, others are signed 16-bit */
293 switch (addr) {
294 case RTQ6056_REG_BUSVOLT:
295 regval >>= devdata->vbus_offset;
296 *val = regval;
297 return IIO_VAL_INT;
298 case RTQ6056_REG_POWER:
299 *val = regval;
300 return IIO_VAL_INT;
301 case RTQ6056_REG_SHUNTVOLT:
302 case RTQ6056_REG_CURRENT:
303 *val = sign_extend32(regval, 16);
304 return IIO_VAL_INT;
305 default:
306 return -EINVAL;
307 }
308 }
309
rtq6056_adc_read_scale(struct iio_chan_spec const * ch,int * val,int * val2)310 static int rtq6056_adc_read_scale(struct iio_chan_spec const *ch, int *val,
311 int *val2)
312 {
313 switch (ch->address) {
314 case RTQ6056_REG_SHUNTVOLT:
315 /* VSHUNT lsb 2.5uV */
316 *val = 2500;
317 *val2 = 1000000;
318 return IIO_VAL_FRACTIONAL;
319 case RTQ6056_REG_BUSVOLT:
320 /* VBUS lsb 1.25mV */
321 *val = 1250;
322 *val2 = 1000;
323 return IIO_VAL_FRACTIONAL;
324 case RTQ6056_REG_POWER:
325 /* Power lsb 25mW */
326 *val = 25;
327 return IIO_VAL_INT;
328 default:
329 return -EINVAL;
330 }
331 }
332
rtq6059_adc_read_scale(struct iio_chan_spec const * ch,int * val,int * val2)333 static int rtq6059_adc_read_scale(struct iio_chan_spec const *ch, int *val,
334 int *val2)
335 {
336 switch (ch->address) {
337 case RTQ6056_REG_SHUNTVOLT:
338 /* VSHUNT lsb 10uV */
339 *val = 10000;
340 *val2 = 1000000;
341 return IIO_VAL_FRACTIONAL;
342 case RTQ6056_REG_BUSVOLT:
343 /* VBUS lsb 4mV */
344 *val = 4;
345 return IIO_VAL_INT;
346 case RTQ6056_REG_POWER:
347 /* Power lsb 20mW */
348 *val = 20;
349 return IIO_VAL_INT;
350 default:
351 return -EINVAL;
352 }
353 }
354
355 /*
356 * Sample frequency for channel VSHUNT and VBUS. The indices correspond
357 * with the bit value expected by the chip. And it can be found at
358 * https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
359 */
360 static const int rtq6056_samp_freq_list[] = {
361 7194, 4926, 3717, 1904, 964, 485, 243, 122,
362 };
363
rtq6056_adc_set_samp_freq(struct rtq6056_priv * priv,struct iio_chan_spec const * ch,int val)364 static int rtq6056_adc_set_samp_freq(struct rtq6056_priv *priv,
365 struct iio_chan_spec const *ch, int val)
366 {
367 struct regmap_field *rm_field;
368 unsigned int selector;
369 int *ct, ret;
370
371 if (val > 7194 || val < 122)
372 return -EINVAL;
373
374 if (ch->address == RTQ6056_REG_SHUNTVOLT) {
375 rm_field = priv->rm_fields[F_VSHUNTCT];
376 ct = &priv->vshuntct_us;
377 } else if (ch->address == RTQ6056_REG_BUSVOLT) {
378 rm_field = priv->rm_fields[F_VBUSCT];
379 ct = &priv->vbusct_us;
380 } else
381 return -EINVAL;
382
383 selector = find_closest_descending(val, rtq6056_samp_freq_list,
384 ARRAY_SIZE(rtq6056_samp_freq_list));
385
386 ret = regmap_field_write(rm_field, selector);
387 if (ret)
388 return ret;
389
390 *ct = 1000000 / rtq6056_samp_freq_list[selector];
391
392 return 0;
393 }
394
395 /*
396 * Available averaging rate for rtq6056. The indices correspond with the bit
397 * value expected by the chip. And it can be found at
398 * https://www.richtek.com/assets/product_file/RTQ6056/DSQ6056-00.pdf
399 */
400 static const int rtq6056_avg_sample_list[] = {
401 1, 4, 16, 64, 128, 256, 512, 1024,
402 };
403
404 static const int rtq6059_avg_sample_list[] = {
405 1, 2, 4, 8, 16, 32, 64, 128,
406 };
407
rtq6056_adc_set_average(struct rtq6056_priv * priv,int val)408 static int rtq6056_adc_set_average(struct rtq6056_priv *priv, int val)
409 {
410 unsigned int selector;
411 int ret;
412
413 if (val > 1024 || val < 1)
414 return -EINVAL;
415
416 selector = find_closest(val, rtq6056_avg_sample_list,
417 ARRAY_SIZE(rtq6056_avg_sample_list));
418
419 ret = regmap_field_write(priv->rm_fields[F_AVG], selector);
420 if (ret)
421 return ret;
422
423 priv->avg_sample = rtq6056_avg_sample_list[selector];
424
425 return 0;
426 }
427
rtq6059_adc_set_average(struct rtq6056_priv * priv,int val)428 static int rtq6059_adc_set_average(struct rtq6056_priv *priv, int val)
429 {
430 unsigned int selector;
431 int ret;
432
433 if (val > 128 || val < 1)
434 return -EINVAL;
435
436 /* The supported average sample is 2^x (x from 0 to 7) */
437 selector = fls(val) - 1;
438
439 ret = regmap_field_write(priv->rm_fields[F_RTQ6059_BADC],
440 RTQ6059_AVG_BASE + selector);
441 if (ret)
442 return ret;
443
444 ret = regmap_field_write(priv->rm_fields[F_RTQ6059_SADC],
445 RTQ6059_AVG_BASE + selector);
446
447 priv->avg_sample = BIT(selector);
448
449 return 0;
450 }
451
rtq6056_adc_get_sample_freq(struct rtq6056_priv * priv,struct iio_chan_spec const * ch,int * val)452 static int rtq6056_adc_get_sample_freq(struct rtq6056_priv *priv,
453 struct iio_chan_spec const *ch, int *val)
454 {
455 int sample_time;
456
457 if (ch->address == RTQ6056_REG_SHUNTVOLT)
458 sample_time = priv->vshuntct_us;
459 else if (ch->address == RTQ6056_REG_BUSVOLT)
460 sample_time = priv->vbusct_us;
461 else {
462 sample_time = priv->vshuntct_us + priv->vbusct_us;
463 sample_time *= priv->avg_sample;
464 }
465
466 *val = 1000000 / sample_time;
467
468 return IIO_VAL_INT;
469 }
470
rtq6056_adc_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int * val,int * val2,long mask)471 static int rtq6056_adc_read_raw(struct iio_dev *indio_dev,
472 struct iio_chan_spec const *chan, int *val,
473 int *val2, long mask)
474 {
475 struct rtq6056_priv *priv = iio_priv(indio_dev);
476 const struct richtek_dev_data *devdata = priv->devdata;
477
478 switch (mask) {
479 case IIO_CHAN_INFO_RAW:
480 return rtq6056_adc_read_channel(priv, chan, val);
481 case IIO_CHAN_INFO_SCALE:
482 return devdata->read_scale(chan, val, val2);
483 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
484 *val = priv->avg_sample;
485 return IIO_VAL_INT;
486 case IIO_CHAN_INFO_SAMP_FREQ:
487 return rtq6056_adc_get_sample_freq(priv, chan, val);
488 default:
489 return -EINVAL;
490 }
491 }
492
rtq6056_adc_read_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,const int ** vals,int * type,int * length,long mask)493 static int rtq6056_adc_read_avail(struct iio_dev *indio_dev,
494 struct iio_chan_spec const *chan,
495 const int **vals, int *type, int *length,
496 long mask)
497 {
498 struct rtq6056_priv *priv = iio_priv(indio_dev);
499 const struct richtek_dev_data *devdata = priv->devdata;
500
501 switch (mask) {
502 case IIO_CHAN_INFO_SAMP_FREQ:
503 *vals = rtq6056_samp_freq_list;
504 *type = IIO_VAL_INT;
505 *length = ARRAY_SIZE(rtq6056_samp_freq_list);
506 return IIO_AVAIL_LIST;
507 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
508 *vals = devdata->avg_sample_list;
509 *length = devdata->avg_sample_list_length;
510 *type = IIO_VAL_INT;
511 return IIO_AVAIL_LIST;
512 default:
513 return -EINVAL;
514 }
515 }
516
rtq6056_adc_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,int val,int val2,long mask)517 static int rtq6056_adc_write_raw(struct iio_dev *indio_dev,
518 struct iio_chan_spec const *chan, int val,
519 int val2, long mask)
520 {
521 struct rtq6056_priv *priv = iio_priv(indio_dev);
522 const struct richtek_dev_data *devdata = priv->devdata;
523
524 iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
525 switch (mask) {
526 case IIO_CHAN_INFO_SAMP_FREQ:
527 if (devdata->fixed_samp_freq)
528 return -EINVAL;
529 return rtq6056_adc_set_samp_freq(priv, chan, val);
530 case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
531 return devdata->set_average(priv, val);
532 default:
533 return -EINVAL;
534 }
535 }
536 unreachable();
537 }
538
539 static const char *rtq6056_channel_labels[RTQ6056_MAX_CHANNEL] = {
540 [RTQ6056_CH_VSHUNT] = "Vshunt",
541 [RTQ6056_CH_VBUS] = "Vbus",
542 [RTQ6056_CH_POWER] = "Power",
543 [RTQ6056_CH_CURRENT] = "Current",
544 };
545
rtq6056_adc_read_label(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,char * label)546 static int rtq6056_adc_read_label(struct iio_dev *indio_dev,
547 struct iio_chan_spec const *chan,
548 char *label)
549 {
550 return sysfs_emit(label, "%s\n", rtq6056_channel_labels[chan->channel]);
551 }
552
rtq6056_set_shunt_resistor(struct rtq6056_priv * priv,int resistor_uohm)553 static int rtq6056_set_shunt_resistor(struct rtq6056_priv *priv,
554 int resistor_uohm)
555 {
556 const struct richtek_dev_data *devdata = priv->devdata;
557 unsigned int calib_val;
558 int ret;
559
560 if (resistor_uohm <= 0) {
561 dev_err(priv->dev, "Invalid resistor [%d]\n", resistor_uohm);
562 return -EINVAL;
563 }
564
565 /* calibration = coefficient / (Rshunt (uOhm) * current lsb (1mA)) */
566 calib_val = devdata->calib_coefficient / resistor_uohm;
567 ret = regmap_write(priv->regmap, RTQ6056_REG_CALIBRATION, calib_val);
568 if (ret)
569 return ret;
570
571 priv->shunt_resistor_uohm = resistor_uohm;
572
573 return 0;
574 }
575
shunt_resistor_show(struct device * dev,struct device_attribute * attr,char * buf)576 static ssize_t shunt_resistor_show(struct device *dev,
577 struct device_attribute *attr, char *buf)
578 {
579 struct rtq6056_priv *priv = iio_priv(dev_to_iio_dev(dev));
580 int vals[2] = { priv->shunt_resistor_uohm, 1000000 };
581
582 return iio_format_value(buf, IIO_VAL_FRACTIONAL, 1, vals);
583 }
584
shunt_resistor_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t len)585 static ssize_t shunt_resistor_store(struct device *dev,
586 struct device_attribute *attr,
587 const char *buf, size_t len)
588 {
589 struct iio_dev *indio_dev = dev_to_iio_dev(dev);
590 struct rtq6056_priv *priv = iio_priv(indio_dev);
591 int val, val_fract, ret;
592
593 ret = iio_device_claim_direct_mode(indio_dev);
594 if (ret)
595 return ret;
596
597 ret = iio_str_to_fixpoint(buf, 100000, &val, &val_fract);
598 if (ret)
599 goto out_store;
600
601 ret = rtq6056_set_shunt_resistor(priv, val * 1000000 + val_fract);
602
603 out_store:
604 iio_device_release_direct_mode(indio_dev);
605
606 return ret ?: len;
607 }
608
609 static IIO_DEVICE_ATTR_RW(shunt_resistor, 0);
610
611 static struct attribute *rtq6056_attributes[] = {
612 &iio_dev_attr_shunt_resistor.dev_attr.attr,
613 NULL
614 };
615
616 static const struct attribute_group rtq6056_attribute_group = {
617 .attrs = rtq6056_attributes,
618 };
619
620 static const struct iio_info rtq6056_info = {
621 .attrs = &rtq6056_attribute_group,
622 .read_raw = rtq6056_adc_read_raw,
623 .read_avail = rtq6056_adc_read_avail,
624 .write_raw = rtq6056_adc_write_raw,
625 .read_label = rtq6056_adc_read_label,
626 };
627
rtq6056_buffer_trigger_handler(int irq,void * p)628 static irqreturn_t rtq6056_buffer_trigger_handler(int irq, void *p)
629 {
630 struct iio_poll_func *pf = p;
631 struct iio_dev *indio_dev = pf->indio_dev;
632 struct rtq6056_priv *priv = iio_priv(indio_dev);
633 const struct richtek_dev_data *devdata = priv->devdata;
634 struct device *dev = priv->dev;
635 struct {
636 u16 vals[RTQ6056_MAX_CHANNEL];
637 s64 timestamp __aligned(8);
638 } data;
639 unsigned int raw;
640 int i = 0, bit, ret;
641
642 memset(&data, 0, sizeof(data));
643
644 pm_runtime_get_sync(dev);
645
646 iio_for_each_active_channel(indio_dev, bit) {
647 unsigned int addr = rtq6056_channels[bit].address;
648
649 ret = regmap_read(priv->regmap, addr, &raw);
650 if (ret)
651 goto out;
652
653 if (addr == RTQ6056_REG_BUSVOLT)
654 raw >>= devdata->vbus_offset;
655
656 data.vals[i++] = raw;
657 }
658
659 iio_push_to_buffers_with_timestamp(indio_dev, &data, iio_get_time_ns(indio_dev));
660
661 out:
662 pm_runtime_mark_last_busy(dev);
663 pm_runtime_put(dev);
664
665 iio_trigger_notify_done(indio_dev->trig);
666
667 return IRQ_HANDLED;
668 }
669
rtq6056_enter_shutdown_state(void * dev)670 static void rtq6056_enter_shutdown_state(void *dev)
671 {
672 struct rtq6056_priv *priv = dev_get_drvdata(dev);
673
674 /* Enter shutdown state */
675 regmap_field_write(priv->rm_fields[F_OPMODE], 0);
676 }
677
rtq6056_is_readable_reg(struct device * dev,unsigned int reg)678 static bool rtq6056_is_readable_reg(struct device *dev, unsigned int reg)
679 {
680 switch (reg) {
681 case RTQ6056_REG_CONFIG ... RTQ6056_REG_ALERTLIMIT:
682 case RTQ6056_REG_MANUFACTID ... RTQ6056_REG_DIEID:
683 return true;
684 default:
685 return false;
686 }
687 }
688
rtq6056_is_writeable_reg(struct device * dev,unsigned int reg)689 static bool rtq6056_is_writeable_reg(struct device *dev, unsigned int reg)
690 {
691 switch (reg) {
692 case RTQ6056_REG_CONFIG:
693 case RTQ6056_REG_CALIBRATION ... RTQ6056_REG_ALERTLIMIT:
694 return true;
695 default:
696 return false;
697 }
698 }
699
700 static const struct regmap_config rtq6056_regmap_config = {
701 .reg_bits = 8,
702 .val_bits = 16,
703 .val_format_endian = REGMAP_ENDIAN_BIG,
704 .max_register = RTQ6056_REG_DIEID,
705 .readable_reg = rtq6056_is_readable_reg,
706 .writeable_reg = rtq6056_is_writeable_reg,
707 };
708
rtq6056_probe(struct i2c_client * i2c)709 static int rtq6056_probe(struct i2c_client *i2c)
710 {
711 struct iio_dev *indio_dev;
712 struct rtq6056_priv *priv;
713 struct device *dev = &i2c->dev;
714 struct regmap *regmap;
715 const struct richtek_dev_data *devdata;
716 unsigned int vendor_id, shunt_resistor_uohm;
717 int ret;
718
719 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_WORD_DATA))
720 return -EOPNOTSUPP;
721
722 devdata = device_get_match_data(dev);
723 if (!devdata)
724 return dev_err_probe(dev, -EINVAL, "Invalid dev data\n");
725
726 indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
727 if (!indio_dev)
728 return -ENOMEM;
729
730 priv = iio_priv(indio_dev);
731 priv->dev = dev;
732 priv->vshuntct_us = priv->vbusct_us = devdata->default_conv_time_us;
733 priv->avg_sample = 1;
734 priv->devdata = devdata;
735 i2c_set_clientdata(i2c, priv);
736
737 regmap = devm_regmap_init_i2c(i2c, &rtq6056_regmap_config);
738 if (IS_ERR(regmap))
739 return dev_err_probe(dev, PTR_ERR(regmap),
740 "Failed to init regmap\n");
741
742 priv->regmap = regmap;
743
744 ret = regmap_read(regmap, RTQ6056_REG_MANUFACTID, &vendor_id);
745 if (ret)
746 return dev_err_probe(dev, ret,
747 "Failed to get manufacturer info\n");
748
749 if (vendor_id != RTQ6056_VENDOR_ID)
750 return dev_err_probe(dev, -ENODEV,
751 "Invalid vendor id 0x%04x\n", vendor_id);
752
753 ret = devm_regmap_field_bulk_alloc(dev, regmap, priv->rm_fields,
754 devdata->reg_fields, F_MAX_FIELDS);
755 if (ret)
756 return dev_err_probe(dev, ret, "Failed to init regmap field\n");
757
758 ret = regmap_write(regmap, RTQ6056_REG_CONFIG, devdata->default_config);
759 if (ret)
760 return dev_err_probe(dev, ret,
761 "Failed to enable continuous sensing\n");
762
763 ret = devm_add_action_or_reset(dev, rtq6056_enter_shutdown_state, dev);
764 if (ret)
765 return ret;
766
767 pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
768 pm_runtime_use_autosuspend(dev);
769 pm_runtime_set_active(dev);
770 pm_runtime_mark_last_busy(dev);
771 ret = devm_pm_runtime_enable(dev);
772 if (ret)
773 return dev_err_probe(dev, ret, "Failed to enable pm_runtime\n");
774
775 /* By default, use 2000 micro-Ohm resistor */
776 shunt_resistor_uohm = 2000;
777 device_property_read_u32(dev, "shunt-resistor-micro-ohms",
778 &shunt_resistor_uohm);
779
780 ret = rtq6056_set_shunt_resistor(priv, shunt_resistor_uohm);
781 if (ret)
782 return dev_err_probe(dev, ret,
783 "Failed to init shunt resistor\n");
784
785 indio_dev->name = "rtq6056";
786 indio_dev->modes = INDIO_DIRECT_MODE;
787 indio_dev->channels = devdata->channels;
788 indio_dev->num_channels = devdata->num_channels;
789 indio_dev->info = &rtq6056_info;
790
791 ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
792 rtq6056_buffer_trigger_handler,
793 NULL);
794 if (ret)
795 return dev_err_probe(dev, ret,
796 "Failed to allocate iio trigger buffer\n");
797
798 return devm_iio_device_register(dev, indio_dev);
799 }
800
rtq6056_runtime_suspend(struct device * dev)801 static int rtq6056_runtime_suspend(struct device *dev)
802 {
803 struct rtq6056_priv *priv = dev_get_drvdata(dev);
804
805 /* Configure to shutdown mode */
806 return regmap_field_write(priv->rm_fields[F_OPMODE], 0);
807 }
808
rtq6056_runtime_resume(struct device * dev)809 static int rtq6056_runtime_resume(struct device *dev)
810 {
811 struct rtq6056_priv *priv = dev_get_drvdata(dev);
812 int sample_rdy_time_us, ret;
813
814 ret = regmap_field_write(priv->rm_fields[F_OPMODE], RTQ6056_CONT_ALLON);
815 if (ret)
816 return ret;
817
818 sample_rdy_time_us = priv->vbusct_us + priv->vshuntct_us;
819 sample_rdy_time_us *= priv->avg_sample;
820
821 usleep_range(sample_rdy_time_us, sample_rdy_time_us + 100);
822
823 return 0;
824 }
825
826 static DEFINE_RUNTIME_DEV_PM_OPS(rtq6056_pm_ops, rtq6056_runtime_suspend,
827 rtq6056_runtime_resume, NULL);
828
829 static const struct richtek_dev_data rtq6056_devdata = {
830 .default_conv_time_us = 1037,
831 .calib_coefficient = 5120000,
832 /*
833 * By default, configure average sample as 1, bus and shunt conversion
834 * time as 1037 microsecond, and operating mode to all on.
835 */
836 .default_config = RTQ6056_DEFAULT_CONFIG,
837 .avg_sample_list = rtq6056_avg_sample_list,
838 .avg_sample_list_length = ARRAY_SIZE(rtq6056_avg_sample_list),
839 .reg_fields = rtq6056_reg_fields,
840 .channels = rtq6056_channels,
841 .num_channels = ARRAY_SIZE(rtq6056_channels),
842 .read_scale = rtq6056_adc_read_scale,
843 .set_average = rtq6056_adc_set_average,
844 };
845
846 static const struct richtek_dev_data rtq6059_devdata = {
847 .fixed_samp_freq = true,
848 .vbus_offset = RTQ6059_VBUS_LSB_OFFSET,
849 .default_conv_time_us = 532,
850 .calib_coefficient = 40960000,
851 /*
852 * By default, configure average sample as 1, bus and shunt conversion
853 * time as 532 microsecond, and operating mode to all on.
854 */
855 .default_config = RTQ6059_DEFAULT_CONFIG,
856 .avg_sample_list = rtq6059_avg_sample_list,
857 .avg_sample_list_length = ARRAY_SIZE(rtq6059_avg_sample_list),
858 .reg_fields = rtq6059_reg_fields,
859 .channels = rtq6059_channels,
860 .num_channels = ARRAY_SIZE(rtq6059_channels),
861 .read_scale = rtq6059_adc_read_scale,
862 .set_average = rtq6059_adc_set_average,
863 };
864
865 static const struct of_device_id rtq6056_device_match[] = {
866 { .compatible = "richtek,rtq6056", .data = &rtq6056_devdata },
867 { .compatible = "richtek,rtq6059", .data = &rtq6059_devdata },
868 { }
869 };
870 MODULE_DEVICE_TABLE(of, rtq6056_device_match);
871
872 static struct i2c_driver rtq6056_driver = {
873 .driver = {
874 .name = "rtq6056",
875 .of_match_table = rtq6056_device_match,
876 .pm = pm_ptr(&rtq6056_pm_ops),
877 },
878 .probe = rtq6056_probe,
879 };
880 module_i2c_driver(rtq6056_driver);
881
882 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
883 MODULE_DESCRIPTION("Richtek RTQ6056 Driver");
884 MODULE_LICENSE("GPL v2");
885