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1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2/*
3 * LTC2992 - Dual Wide Range Power Monitor
4 *
5 * Copyright 2020 Analog Devices Inc.
6 */
7
8#include <linux/bitfield.h>
9#include <linux/bitops.h>
10#include <linux/err.h>
11#include <linux/gpio/driver.h>
12#include <linux/hwmon.h>
13#include <linux/i2c.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/property.h>
17#include <linux/regmap.h>
18
19#define LTC2992_CTRLB 0x01
20#define LTC2992_FAULT1 0x03
21#define LTC2992_POWER1 0x05
22#define LTC2992_POWER1_MAX 0x08
23#define LTC2992_POWER1_MIN 0x0B
24#define LTC2992_POWER1_MAX_THRESH 0x0E
25#define LTC2992_POWER1_MIN_THRESH 0x11
26#define LTC2992_DSENSE1 0x14
27#define LTC2992_DSENSE1_MAX 0x16
28#define LTC2992_DSENSE1_MIN 0x18
29#define LTC2992_DSENSE1_MAX_THRESH 0x1A
30#define LTC2992_DSENSE1_MIN_THRESH 0x1C
31#define LTC2992_SENSE1 0x1E
32#define LTC2992_SENSE1_MAX 0x20
33#define LTC2992_SENSE1_MIN 0x22
34#define LTC2992_SENSE1_MAX_THRESH 0x24
35#define LTC2992_SENSE1_MIN_THRESH 0x26
36#define LTC2992_G1 0x28
37#define LTC2992_G1_MAX 0x2A
38#define LTC2992_G1_MIN 0x2C
39#define LTC2992_G1_MAX_THRESH 0x2E
40#define LTC2992_G1_MIN_THRESH 0x30
41#define LTC2992_FAULT2 0x35
42#define LTC2992_G2 0x5A
43#define LTC2992_G2_MAX 0x5C
44#define LTC2992_G2_MIN 0x5E
45#define LTC2992_G2_MAX_THRESH 0x60
46#define LTC2992_G2_MIN_THRESH 0x62
47#define LTC2992_G3 0x64
48#define LTC2992_G3_MAX 0x66
49#define LTC2992_G3_MIN 0x68
50#define LTC2992_G3_MAX_THRESH 0x6A
51#define LTC2992_G3_MIN_THRESH 0x6C
52#define LTC2992_G4 0x6E
53#define LTC2992_G4_MAX 0x70
54#define LTC2992_G4_MIN 0x72
55#define LTC2992_G4_MAX_THRESH 0x74
56#define LTC2992_G4_MIN_THRESH 0x76
57#define LTC2992_FAULT3 0x92
58#define LTC2992_GPIO_STATUS 0x95
59#define LTC2992_GPIO_IO_CTRL 0x96
60#define LTC2992_GPIO_CTRL 0x97
61
62#define LTC2992_POWER(x) (LTC2992_POWER1 + ((x) * 0x32))
63#define LTC2992_POWER_MAX(x) (LTC2992_POWER1_MAX + ((x) * 0x32))
64#define LTC2992_POWER_MIN(x) (LTC2992_POWER1_MIN + ((x) * 0x32))
65#define LTC2992_POWER_MAX_THRESH(x) (LTC2992_POWER1_MAX_THRESH + ((x) * 0x32))
66#define LTC2992_POWER_MIN_THRESH(x) (LTC2992_POWER1_MIN_THRESH + ((x) * 0x32))
67#define LTC2992_DSENSE(x) (LTC2992_DSENSE1 + ((x) * 0x32))
68#define LTC2992_DSENSE_MAX(x) (LTC2992_DSENSE1_MAX + ((x) * 0x32))
69#define LTC2992_DSENSE_MIN(x) (LTC2992_DSENSE1_MIN + ((x) * 0x32))
70#define LTC2992_DSENSE_MAX_THRESH(x) (LTC2992_DSENSE1_MAX_THRESH + ((x) * 0x32))
71#define LTC2992_DSENSE_MIN_THRESH(x) (LTC2992_DSENSE1_MIN_THRESH + ((x) * 0x32))
72#define LTC2992_SENSE(x) (LTC2992_SENSE1 + ((x) * 0x32))
73#define LTC2992_SENSE_MAX(x) (LTC2992_SENSE1_MAX + ((x) * 0x32))
74#define LTC2992_SENSE_MIN(x) (LTC2992_SENSE1_MIN + ((x) * 0x32))
75#define LTC2992_SENSE_MAX_THRESH(x) (LTC2992_SENSE1_MAX_THRESH + ((x) * 0x32))
76#define LTC2992_SENSE_MIN_THRESH(x) (LTC2992_SENSE1_MIN_THRESH + ((x) * 0x32))
77#define LTC2992_POWER_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32))
78#define LTC2992_SENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32))
79#define LTC2992_DSENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32))
80
81/* CTRLB register bitfields */
82#define LTC2992_RESET_HISTORY BIT(3)
83
84/* FAULT1 FAULT2 registers common bitfields */
85#define LTC2992_POWER_FAULT_MSK(x) (BIT(6) << (x))
86#define LTC2992_DSENSE_FAULT_MSK(x) (BIT(4) << (x))
87#define LTC2992_SENSE_FAULT_MSK(x) (BIT(2) << (x))
88
89/* FAULT1 bitfields */
90#define LTC2992_GPIO1_FAULT_MSK(x) (BIT(0) << (x))
91
92/* FAULT2 bitfields */
93#define LTC2992_GPIO2_FAULT_MSK(x) (BIT(0) << (x))
94
95/* FAULT3 bitfields */
96#define LTC2992_GPIO3_FAULT_MSK(x) (BIT(6) << (x))
97#define LTC2992_GPIO4_FAULT_MSK(x) (BIT(4) << (x))
98
99#define LTC2992_IADC_NANOV_LSB 12500
100#define LTC2992_VADC_UV_LSB 25000
101#define LTC2992_VADC_GPIO_UV_LSB 500
102
103#define LTC2992_GPIO_NR 4
104#define LTC2992_GPIO1_BIT 7
105#define LTC2992_GPIO2_BIT 6
106#define LTC2992_GPIO3_BIT 0
107#define LTC2992_GPIO4_BIT 6
108#define LTC2992_GPIO_BIT(x) (LTC2992_GPIO_NR - (x) - 1)
109
110struct ltc2992_state {
111 struct i2c_client *client;
112 struct gpio_chip gc;
113 struct mutex gpio_mutex; /* lock for gpio access */
114 const char *gpio_names[LTC2992_GPIO_NR];
115 struct regmap *regmap;
116 u32 r_sense_uohm[2];
117};
118
119struct ltc2992_gpio_regs {
120 u8 data;
121 u8 max;
122 u8 min;
123 u8 max_thresh;
124 u8 min_thresh;
125 u8 alarm;
126 u8 min_alarm_msk;
127 u8 max_alarm_msk;
128 u8 ctrl;
129 u8 ctrl_bit;
130};
131
132static const struct ltc2992_gpio_regs ltc2992_gpio_addr_map[] = {
133 {
134 .data = LTC2992_G1,
135 .max = LTC2992_G1_MAX,
136 .min = LTC2992_G1_MIN,
137 .max_thresh = LTC2992_G1_MAX_THRESH,
138 .min_thresh = LTC2992_G1_MIN_THRESH,
139 .alarm = LTC2992_FAULT1,
140 .min_alarm_msk = LTC2992_GPIO1_FAULT_MSK(0),
141 .max_alarm_msk = LTC2992_GPIO1_FAULT_MSK(1),
142 .ctrl = LTC2992_GPIO_IO_CTRL,
143 .ctrl_bit = LTC2992_GPIO1_BIT,
144 },
145 {
146 .data = LTC2992_G2,
147 .max = LTC2992_G2_MAX,
148 .min = LTC2992_G2_MIN,
149 .max_thresh = LTC2992_G2_MAX_THRESH,
150 .min_thresh = LTC2992_G2_MIN_THRESH,
151 .alarm = LTC2992_FAULT2,
152 .min_alarm_msk = LTC2992_GPIO2_FAULT_MSK(0),
153 .max_alarm_msk = LTC2992_GPIO2_FAULT_MSK(1),
154 .ctrl = LTC2992_GPIO_IO_CTRL,
155 .ctrl_bit = LTC2992_GPIO2_BIT,
156 },
157 {
158 .data = LTC2992_G3,
159 .max = LTC2992_G3_MAX,
160 .min = LTC2992_G3_MIN,
161 .max_thresh = LTC2992_G3_MAX_THRESH,
162 .min_thresh = LTC2992_G3_MIN_THRESH,
163 .alarm = LTC2992_FAULT3,
164 .min_alarm_msk = LTC2992_GPIO3_FAULT_MSK(0),
165 .max_alarm_msk = LTC2992_GPIO3_FAULT_MSK(1),
166 .ctrl = LTC2992_GPIO_IO_CTRL,
167 .ctrl_bit = LTC2992_GPIO3_BIT,
168 },
169 {
170 .data = LTC2992_G4,
171 .max = LTC2992_G4_MAX,
172 .min = LTC2992_G4_MIN,
173 .max_thresh = LTC2992_G4_MAX_THRESH,
174 .min_thresh = LTC2992_G4_MIN_THRESH,
175 .alarm = LTC2992_FAULT3,
176 .min_alarm_msk = LTC2992_GPIO4_FAULT_MSK(0),
177 .max_alarm_msk = LTC2992_GPIO4_FAULT_MSK(1),
178 .ctrl = LTC2992_GPIO_CTRL,
179 .ctrl_bit = LTC2992_GPIO4_BIT,
180 },
181};
182
183static const char *ltc2992_gpio_names[LTC2992_GPIO_NR] = {
184 "GPIO1", "GPIO2", "GPIO3", "GPIO4",
185};
186
187static int ltc2992_read_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len)
188{
189 u8 regvals[4];
190 int val;
191 int ret;
192 int i;
193
194 ret = regmap_bulk_read(st->regmap, addr, regvals, reg_len);
195 if (ret < 0)
196 return ret;
197
198 val = 0;
199 for (i = 0; i < reg_len; i++)
200 val |= regvals[reg_len - i - 1] << (i * 8);
201
202 return val;
203}
204
205static int ltc2992_write_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len, u32 val)
206{
207 u8 regvals[4];
208 int i;
209
210 for (i = 0; i < reg_len; i++)
211 regvals[reg_len - i - 1] = (val >> (i * 8)) & 0xFF;
212
213 return regmap_bulk_write(st->regmap, addr, regvals, reg_len);
214}
215
216static int ltc2992_gpio_get(struct gpio_chip *chip, unsigned int offset)
217{
218 struct ltc2992_state *st = gpiochip_get_data(chip);
219 unsigned long gpio_status;
220 int reg;
221
222 mutex_lock(&st->gpio_mutex);
223 reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1);
224 mutex_unlock(&st->gpio_mutex);
225
226 if (reg < 0)
227 return reg;
228
229 gpio_status = reg;
230
231 return !test_bit(LTC2992_GPIO_BIT(offset), &gpio_status);
232}
233
234static int ltc2992_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
235 unsigned long *bits)
236{
237 struct ltc2992_state *st = gpiochip_get_data(chip);
238 unsigned long gpio_status;
239 unsigned int gpio_nr;
240 int reg;
241
242 mutex_lock(&st->gpio_mutex);
243 reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1);
244 mutex_unlock(&st->gpio_mutex);
245
246 if (reg < 0)
247 return reg;
248
249 gpio_status = reg;
250
251 for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
252 if (test_bit(LTC2992_GPIO_BIT(gpio_nr), &gpio_status))
253 set_bit(gpio_nr, bits);
254 }
255
256 return 0;
257}
258
259static void ltc2992_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
260{
261 struct ltc2992_state *st = gpiochip_get_data(chip);
262 unsigned long gpio_ctrl;
263 int reg;
264
265 mutex_lock(&st->gpio_mutex);
266 reg = ltc2992_read_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1);
267 if (reg < 0) {
268 mutex_unlock(&st->gpio_mutex);
269 return;
270 }
271
272 gpio_ctrl = reg;
273 assign_bit(ltc2992_gpio_addr_map[offset].ctrl_bit, &gpio_ctrl, value);
274
275 ltc2992_write_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1, gpio_ctrl);
276 mutex_unlock(&st->gpio_mutex);
277}
278
279static void ltc2992_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
280 unsigned long *bits)
281{
282 struct ltc2992_state *st = gpiochip_get_data(chip);
283 unsigned long gpio_ctrl_io = 0;
284 unsigned long gpio_ctrl = 0;
285 unsigned int gpio_nr;
286
287 for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) {
288 if (gpio_nr < 3)
289 assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl_io, true);
290
291 if (gpio_nr == 3)
292 assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl, true);
293 }
294
295 mutex_lock(&st->gpio_mutex);
296 ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, gpio_ctrl_io);
297 ltc2992_write_reg(st, LTC2992_GPIO_CTRL, 1, gpio_ctrl);
298 mutex_unlock(&st->gpio_mutex);
299}
300
301static int ltc2992_config_gpio(struct ltc2992_state *st)
302{
303 const char *name = dev_name(&st->client->dev);
304 char *gpio_name;
305 int ret;
306 int i;
307
308 ret = ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, 0);
309 if (ret < 0)
310 return ret;
311
312 mutex_init(&st->gpio_mutex);
313
314 for (i = 0; i < ARRAY_SIZE(st->gpio_names); i++) {
315 gpio_name = devm_kasprintf(&st->client->dev, GFP_KERNEL, "ltc2992-%x-%s",
316 st->client->addr, ltc2992_gpio_names[i]);
317 if (!gpio_name)
318 return -ENOMEM;
319
320 st->gpio_names[i] = gpio_name;
321 }
322
323 st->gc.label = name;
324 st->gc.parent = &st->client->dev;
325 st->gc.owner = THIS_MODULE;
326 st->gc.base = -1;
327 st->gc.names = st->gpio_names;
328 st->gc.ngpio = ARRAY_SIZE(st->gpio_names);
329 st->gc.get = ltc2992_gpio_get;
330 st->gc.get_multiple = ltc2992_gpio_get_multiple;
331 st->gc.set = ltc2992_gpio_set;
332 st->gc.set_multiple = ltc2992_gpio_set_multiple;
333
334 ret = devm_gpiochip_add_data(&st->client->dev, &st->gc, st);
335 if (ret)
336 dev_err(&st->client->dev, "GPIO registering failed (%d)\n", ret);
337
338 return ret;
339}
340
341static umode_t ltc2992_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
342 int channel)
343{
344 const struct ltc2992_state *st = data;
345
346 switch (type) {
347 case hwmon_chip:
348 switch (attr) {
349 case hwmon_chip_in_reset_history:
350 return 0200;
351 }
352 break;
353 case hwmon_in:
354 switch (attr) {
355 case hwmon_in_input:
356 case hwmon_in_lowest:
357 case hwmon_in_highest:
358 case hwmon_in_min_alarm:
359 case hwmon_in_max_alarm:
360 return 0444;
361 case hwmon_in_min:
362 case hwmon_in_max:
363 return 0644;
364 }
365 break;
366 case hwmon_curr:
367 switch (attr) {
368 case hwmon_curr_input:
369 case hwmon_curr_lowest:
370 case hwmon_curr_highest:
371 case hwmon_curr_min_alarm:
372 case hwmon_curr_max_alarm:
373 if (st->r_sense_uohm[channel])
374 return 0444;
375 break;
376 case hwmon_curr_min:
377 case hwmon_curr_max:
378 if (st->r_sense_uohm[channel])
379 return 0644;
380 break;
381 }
382 break;
383 case hwmon_power:
384 switch (attr) {
385 case hwmon_power_input:
386 case hwmon_power_input_lowest:
387 case hwmon_power_input_highest:
388 case hwmon_power_min_alarm:
389 case hwmon_power_max_alarm:
390 if (st->r_sense_uohm[channel])
391 return 0444;
392 break;
393 case hwmon_power_min:
394 case hwmon_power_max:
395 if (st->r_sense_uohm[channel])
396 return 0644;
397 break;
398 }
399 break;
400 default:
401 break;
402 }
403
404 return 0;
405}
406
407static int ltc2992_get_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long *val)
408{
409 int reg_val;
410
411 reg_val = ltc2992_read_reg(st, reg, 2);
412 if (reg_val < 0)
413 return reg_val;
414
415 reg_val = reg_val >> 4;
416 *val = DIV_ROUND_CLOSEST(reg_val * scale, 1000);
417
418 return 0;
419}
420
421static int ltc2992_set_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long val)
422{
423 val = DIV_ROUND_CLOSEST(val * 1000, scale);
424 val = val << 4;
425
426 return ltc2992_write_reg(st, reg, 2, val);
427}
428
429static int ltc2992_read_gpio_alarm(struct ltc2992_state *st, int nr_gpio, u32 attr, long *val)
430{
431 int reg_val;
432 u32 mask;
433
434 if (attr == hwmon_in_max_alarm)
435 mask = ltc2992_gpio_addr_map[nr_gpio].max_alarm_msk;
436 else
437 mask = ltc2992_gpio_addr_map[nr_gpio].min_alarm_msk;
438
439 reg_val = ltc2992_read_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1);
440 if (reg_val < 0)
441 return reg_val;
442
443 *val = !!(reg_val & mask);
444 reg_val &= ~mask;
445
446 return ltc2992_write_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1, reg_val);
447}
448
449static int ltc2992_read_gpios_in(struct device *dev, u32 attr, int nr_gpio, long *val)
450{
451 struct ltc2992_state *st = dev_get_drvdata(dev);
452 u32 reg;
453
454 switch (attr) {
455 case hwmon_in_input:
456 reg = ltc2992_gpio_addr_map[nr_gpio].data;
457 break;
458 case hwmon_in_lowest:
459 reg = ltc2992_gpio_addr_map[nr_gpio].min;
460 break;
461 case hwmon_in_highest:
462 reg = ltc2992_gpio_addr_map[nr_gpio].max;
463 break;
464 case hwmon_in_min:
465 reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
466 break;
467 case hwmon_in_max:
468 reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh;
469 break;
470 case hwmon_in_min_alarm:
471 case hwmon_in_max_alarm:
472 return ltc2992_read_gpio_alarm(st, nr_gpio, attr, val);
473 default:
474 return -EOPNOTSUPP;
475 }
476
477 return ltc2992_get_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val);
478}
479
480static int ltc2992_read_in_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
481{
482 int reg_val;
483 u32 mask;
484
485 if (attr == hwmon_in_max_alarm)
486 mask = LTC2992_SENSE_FAULT_MSK(1);
487 else
488 mask = LTC2992_SENSE_FAULT_MSK(0);
489
490 reg_val = ltc2992_read_reg(st, LTC2992_SENSE_FAULT(channel), 1);
491 if (reg_val < 0)
492 return reg_val;
493
494 *val = !!(reg_val & mask);
495 reg_val &= ~mask;
496
497 return ltc2992_write_reg(st, LTC2992_SENSE_FAULT(channel), 1, reg_val);
498}
499
500static int ltc2992_read_in(struct device *dev, u32 attr, int channel, long *val)
501{
502 struct ltc2992_state *st = dev_get_drvdata(dev);
503 u32 reg;
504
505 if (channel > 1)
506 return ltc2992_read_gpios_in(dev, attr, channel - 2, val);
507
508 switch (attr) {
509 case hwmon_in_input:
510 reg = LTC2992_SENSE(channel);
511 break;
512 case hwmon_in_lowest:
513 reg = LTC2992_SENSE_MIN(channel);
514 break;
515 case hwmon_in_highest:
516 reg = LTC2992_SENSE_MAX(channel);
517 break;
518 case hwmon_in_min:
519 reg = LTC2992_SENSE_MIN_THRESH(channel);
520 break;
521 case hwmon_in_max:
522 reg = LTC2992_SENSE_MAX_THRESH(channel);
523 break;
524 case hwmon_in_min_alarm:
525 case hwmon_in_max_alarm:
526 return ltc2992_read_in_alarm(st, channel, val, attr);
527 default:
528 return -EOPNOTSUPP;
529 }
530
531 return ltc2992_get_voltage(st, reg, LTC2992_VADC_UV_LSB, val);
532}
533
534static int ltc2992_get_current(struct ltc2992_state *st, u32 reg, u32 channel, long *val)
535{
536 int reg_val;
537
538 reg_val = ltc2992_read_reg(st, reg, 2);
539 if (reg_val < 0)
540 return reg_val;
541
542 reg_val = reg_val >> 4;
543 *val = DIV_ROUND_CLOSEST(reg_val * LTC2992_IADC_NANOV_LSB, st->r_sense_uohm[channel]);
544
545 return 0;
546}
547
548static int ltc2992_set_current(struct ltc2992_state *st, u32 reg, u32 channel, long val)
549{
550 u32 reg_val;
551
552 reg_val = DIV_ROUND_CLOSEST(val * st->r_sense_uohm[channel], LTC2992_IADC_NANOV_LSB);
553 reg_val = reg_val << 4;
554
555 return ltc2992_write_reg(st, reg, 2, reg_val);
556}
557
558static int ltc2992_read_curr_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
559{
560 int reg_val;
561 u32 mask;
562
563 if (attr == hwmon_curr_max_alarm)
564 mask = LTC2992_DSENSE_FAULT_MSK(1);
565 else
566 mask = LTC2992_DSENSE_FAULT_MSK(0);
567
568 reg_val = ltc2992_read_reg(st, LTC2992_DSENSE_FAULT(channel), 1);
569 if (reg_val < 0)
570 return reg_val;
571
572 *val = !!(reg_val & mask);
573
574 reg_val &= ~mask;
575 return ltc2992_write_reg(st, LTC2992_DSENSE_FAULT(channel), 1, reg_val);
576}
577
578static int ltc2992_read_curr(struct device *dev, u32 attr, int channel, long *val)
579{
580 struct ltc2992_state *st = dev_get_drvdata(dev);
581 u32 reg;
582
583 switch (attr) {
584 case hwmon_curr_input:
585 reg = LTC2992_DSENSE(channel);
586 break;
587 case hwmon_curr_lowest:
588 reg = LTC2992_DSENSE_MIN(channel);
589 break;
590 case hwmon_curr_highest:
591 reg = LTC2992_DSENSE_MAX(channel);
592 break;
593 case hwmon_curr_min:
594 reg = LTC2992_DSENSE_MIN_THRESH(channel);
595 break;
596 case hwmon_curr_max:
597 reg = LTC2992_DSENSE_MAX_THRESH(channel);
598 break;
599 case hwmon_curr_min_alarm:
600 case hwmon_curr_max_alarm:
601 return ltc2992_read_curr_alarm(st, channel, val, attr);
602 default:
603 return -EOPNOTSUPP;
604 }
605
606 return ltc2992_get_current(st, reg, channel, val);
607}
608
609static int ltc2992_get_power(struct ltc2992_state *st, u32 reg, u32 channel, long *val)
610{
611 int reg_val;
612
613 reg_val = ltc2992_read_reg(st, reg, 3);
614 if (reg_val < 0)
615 return reg_val;
616
617 *val = mul_u64_u32_div(reg_val, LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB,
618 st->r_sense_uohm[channel] * 1000);
619
620 return 0;
621}
622
623static int ltc2992_set_power(struct ltc2992_state *st, u32 reg, u32 channel, long val)
624{
625 u32 reg_val;
626
627 reg_val = mul_u64_u32_div(val, st->r_sense_uohm[channel] * 1000,
628 LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB);
629
630 return ltc2992_write_reg(st, reg, 3, reg_val);
631}
632
633static int ltc2992_read_power_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr)
634{
635 int reg_val;
636 u32 mask;
637
638 if (attr == hwmon_power_max_alarm)
639 mask = LTC2992_POWER_FAULT_MSK(1);
640 else
641 mask = LTC2992_POWER_FAULT_MSK(0);
642
643 reg_val = ltc2992_read_reg(st, LTC2992_POWER_FAULT(channel), 1);
644 if (reg_val < 0)
645 return reg_val;
646
647 *val = !!(reg_val & mask);
648 reg_val &= ~mask;
649
650 return ltc2992_write_reg(st, LTC2992_POWER_FAULT(channel), 1, reg_val);
651}
652
653static int ltc2992_read_power(struct device *dev, u32 attr, int channel, long *val)
654{
655 struct ltc2992_state *st = dev_get_drvdata(dev);
656 u32 reg;
657
658 switch (attr) {
659 case hwmon_power_input:
660 reg = LTC2992_POWER(channel);
661 break;
662 case hwmon_power_input_lowest:
663 reg = LTC2992_POWER_MIN(channel);
664 break;
665 case hwmon_power_input_highest:
666 reg = LTC2992_POWER_MAX(channel);
667 break;
668 case hwmon_power_min:
669 reg = LTC2992_POWER_MIN_THRESH(channel);
670 break;
671 case hwmon_power_max:
672 reg = LTC2992_POWER_MAX_THRESH(channel);
673 break;
674 case hwmon_power_min_alarm:
675 case hwmon_power_max_alarm:
676 return ltc2992_read_power_alarm(st, channel, val, attr);
677 default:
678 return -EOPNOTSUPP;
679 }
680
681 return ltc2992_get_power(st, reg, channel, val);
682}
683
684static int ltc2992_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
685 long *val)
686{
687 switch (type) {
688 case hwmon_in:
689 return ltc2992_read_in(dev, attr, channel, val);
690 case hwmon_curr:
691 return ltc2992_read_curr(dev, attr, channel, val);
692 case hwmon_power:
693 return ltc2992_read_power(dev, attr, channel, val);
694 default:
695 return -EOPNOTSUPP;
696 }
697}
698
699static int ltc2992_write_curr(struct device *dev, u32 attr, int channel, long val)
700{
701 struct ltc2992_state *st = dev_get_drvdata(dev);
702 u32 reg;
703
704 switch (attr) {
705 case hwmon_curr_min:
706 reg = LTC2992_DSENSE_MIN_THRESH(channel);
707 break;
708 case hwmon_curr_max:
709 reg = LTC2992_DSENSE_MAX_THRESH(channel);
710 break;
711 default:
712 return -EOPNOTSUPP;
713 }
714
715 return ltc2992_set_current(st, reg, channel, val);
716}
717
718static int ltc2992_write_gpios_in(struct device *dev, u32 attr, int nr_gpio, long val)
719{
720 struct ltc2992_state *st = dev_get_drvdata(dev);
721 u32 reg;
722
723 switch (attr) {
724 case hwmon_in_min:
725 reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh;
726 break;
727 case hwmon_in_max:
728 reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh;
729 break;
730 default:
731 return -EOPNOTSUPP;
732 }
733
734 return ltc2992_set_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val);
735}
736
737static int ltc2992_write_in(struct device *dev, u32 attr, int channel, long val)
738{
739 struct ltc2992_state *st = dev_get_drvdata(dev);
740 u32 reg;
741
742 if (channel > 1)
743 return ltc2992_write_gpios_in(dev, attr, channel - 2, val);
744
745 switch (attr) {
746 case hwmon_in_min:
747 reg = LTC2992_SENSE_MIN_THRESH(channel);
748 break;
749 case hwmon_in_max:
750 reg = LTC2992_SENSE_MAX_THRESH(channel);
751 break;
752 default:
753 return -EOPNOTSUPP;
754 }
755
756 return ltc2992_set_voltage(st, reg, LTC2992_VADC_UV_LSB, val);
757}
758
759static int ltc2992_write_power(struct device *dev, u32 attr, int channel, long val)
760{
761 struct ltc2992_state *st = dev_get_drvdata(dev);
762 u32 reg;
763
764 switch (attr) {
765 case hwmon_power_min:
766 reg = LTC2992_POWER_MIN_THRESH(channel);
767 break;
768 case hwmon_power_max:
769 reg = LTC2992_POWER_MAX_THRESH(channel);
770 break;
771 default:
772 return -EOPNOTSUPP;
773 }
774
775 return ltc2992_set_power(st, reg, channel, val);
776}
777
778static int ltc2992_write_chip(struct device *dev, u32 attr, int channel, long val)
779{
780 struct ltc2992_state *st = dev_get_drvdata(dev);
781
782 switch (attr) {
783 case hwmon_chip_in_reset_history:
784 return regmap_update_bits(st->regmap, LTC2992_CTRLB, LTC2992_RESET_HISTORY,
785 LTC2992_RESET_HISTORY);
786 default:
787 return -EOPNOTSUPP;
788 }
789}
790
791static int ltc2992_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel,
792 long val)
793{
794 switch (type) {
795 case hwmon_chip:
796 return ltc2992_write_chip(dev, attr, channel, val);
797 case hwmon_in:
798 return ltc2992_write_in(dev, attr, channel, val);
799 case hwmon_curr:
800 return ltc2992_write_curr(dev, attr, channel, val);
801 case hwmon_power:
802 return ltc2992_write_power(dev, attr, channel, val);
803 default:
804 return -EOPNOTSUPP;
805 }
806}
807
808static const struct hwmon_ops ltc2992_hwmon_ops = {
809 .is_visible = ltc2992_is_visible,
810 .read = ltc2992_read,
811 .write = ltc2992_write,
812};
813
814static const struct hwmon_channel_info *ltc2992_info[] = {
815 HWMON_CHANNEL_INFO(chip,
816 HWMON_C_IN_RESET_HISTORY),
817 HWMON_CHANNEL_INFO(in,
818 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
819 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
820 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
821 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
822 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
823 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
824 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
825 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
826 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
827 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM,
828 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN |
829 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM),
830 HWMON_CHANNEL_INFO(curr,
831 HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN |
832 HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM,
833 HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN |
834 HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM),
835 HWMON_CHANNEL_INFO(power,
836 HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST |
837 HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM,
838 HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST |
839 HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM),
840 NULL
841};
842
843static const struct hwmon_chip_info ltc2992_chip_info = {
844 .ops = <c2992_hwmon_ops,
845 .info = ltc2992_info,
846};
847
848static const struct regmap_config ltc2992_regmap_config = {
849 .reg_bits = 8,
850 .val_bits = 8,
851 .max_register = 0xE8,
852};
853
854static int ltc2992_parse_dt(struct ltc2992_state *st)
855{
856 struct fwnode_handle *fwnode;
857 struct fwnode_handle *child;
858 u32 addr;
859 u32 val;
860 int ret;
861
862 fwnode = dev_fwnode(&st->client->dev);
863
864 fwnode_for_each_available_child_node(fwnode, child) {
865 ret = fwnode_property_read_u32(child, "reg", &addr);
866 if (ret < 0) {
867 fwnode_handle_put(child);
868 return ret;
869 }
870
871 if (addr > 1) {
872 fwnode_handle_put(child);
873 return -EINVAL;
874 }
875
876 ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val);
877 if (!ret)
878 st->r_sense_uohm[addr] = val;
879 }
880
881 return 0;
882}
883
884static int ltc2992_i2c_probe(struct i2c_client *client)
885{
886 struct device *hwmon_dev;
887 struct ltc2992_state *st;
888 int ret;
889
890 st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL);
891 if (!st)
892 return -ENOMEM;
893
894 st->client = client;
895 st->regmap = devm_regmap_init_i2c(client, <c2992_regmap_config);
896 if (IS_ERR(st->regmap))
897 return PTR_ERR(st->regmap);
898
899 ret = ltc2992_parse_dt(st);
900 if (ret < 0)
901 return ret;
902
903 ret = ltc2992_config_gpio(st);
904 if (ret < 0)
905 return ret;
906
907 hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, client->name, st,
908 <c2992_chip_info, NULL);
909
910 return PTR_ERR_OR_ZERO(hwmon_dev);
911}
912
913static const struct of_device_id ltc2992_of_match[] = {
914 { .compatible = "adi,ltc2992" },
915 { }
916};
917MODULE_DEVICE_TABLE(of, ltc2992_of_match);
918
919static const struct i2c_device_id ltc2992_i2c_id[] = {
920 {"ltc2992", 0},
921 {}
922};
923MODULE_DEVICE_TABLE(i2c, ltc2992_i2c_id);
924
925static struct i2c_driver ltc2992_i2c_driver = {
926 .driver = {
927 .name = "ltc2992",
928 .of_match_table = ltc2992_of_match,
929 },
930 .probe_new = ltc2992_i2c_probe,
931 .id_table = ltc2992_i2c_id,
932};
933
934module_i2c_driver(ltc2992_i2c_driver);
935
936MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>");
937MODULE_DESCRIPTION("Hwmon driver for Linear Technology 2992");
938MODULE_LICENSE("Dual BSD/GPL");