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1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* | |
3 | * Copyright (c) 2020 Sartura Ltd. | |
4 | * | |
5 | * Driver for the TI TPS23861 PoE PSE. | |
6 | * | |
7 | * Author: Robert Marko <robert.marko@sartura.hr> | |
8 | */ | |
9 | ||
10 | #include <linux/bitfield.h> | |
11 | #include <linux/debugfs.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/hwmon-sysfs.h> | |
14 | #include <linux/hwmon.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of_device.h> | |
18 | #include <linux/regmap.h> | |
19 | ||
20 | #define TEMPERATURE 0x2c | |
21 | #define INPUT_VOLTAGE_LSB 0x2e | |
22 | #define INPUT_VOLTAGE_MSB 0x2f | |
23 | #define PORT_1_CURRENT_LSB 0x30 | |
24 | #define PORT_1_CURRENT_MSB 0x31 | |
25 | #define PORT_1_VOLTAGE_LSB 0x32 | |
26 | #define PORT_1_VOLTAGE_MSB 0x33 | |
27 | #define PORT_2_CURRENT_LSB 0x34 | |
28 | #define PORT_2_CURRENT_MSB 0x35 | |
29 | #define PORT_2_VOLTAGE_LSB 0x36 | |
30 | #define PORT_2_VOLTAGE_MSB 0x37 | |
31 | #define PORT_3_CURRENT_LSB 0x38 | |
32 | #define PORT_3_CURRENT_MSB 0x39 | |
33 | #define PORT_3_VOLTAGE_LSB 0x3a | |
34 | #define PORT_3_VOLTAGE_MSB 0x3b | |
35 | #define PORT_4_CURRENT_LSB 0x3c | |
36 | #define PORT_4_CURRENT_MSB 0x3d | |
37 | #define PORT_4_VOLTAGE_LSB 0x3e | |
38 | #define PORT_4_VOLTAGE_MSB 0x3f | |
39 | #define PORT_N_CURRENT_LSB_OFFSET 0x04 | |
40 | #define PORT_N_VOLTAGE_LSB_OFFSET 0x04 | |
41 | #define VOLTAGE_CURRENT_MASK GENMASK(13, 0) | |
42 | #define PORT_1_RESISTANCE_LSB 0x60 | |
43 | #define PORT_1_RESISTANCE_MSB 0x61 | |
44 | #define PORT_2_RESISTANCE_LSB 0x62 | |
45 | #define PORT_2_RESISTANCE_MSB 0x63 | |
46 | #define PORT_3_RESISTANCE_LSB 0x64 | |
47 | #define PORT_3_RESISTANCE_MSB 0x65 | |
48 | #define PORT_4_RESISTANCE_LSB 0x66 | |
49 | #define PORT_4_RESISTANCE_MSB 0x67 | |
50 | #define PORT_N_RESISTANCE_LSB_OFFSET 0x02 | |
51 | #define PORT_RESISTANCE_MASK GENMASK(13, 0) | |
52 | #define PORT_RESISTANCE_RSN_MASK GENMASK(15, 14) | |
53 | #define PORT_RESISTANCE_RSN_OTHER 0 | |
54 | #define PORT_RESISTANCE_RSN_LOW 1 | |
55 | #define PORT_RESISTANCE_RSN_OPEN 2 | |
56 | #define PORT_RESISTANCE_RSN_SHORT 3 | |
57 | #define PORT_1_STATUS 0x0c | |
58 | #define PORT_2_STATUS 0x0d | |
59 | #define PORT_3_STATUS 0x0e | |
60 | #define PORT_4_STATUS 0x0f | |
61 | #define PORT_STATUS_CLASS_MASK GENMASK(7, 4) | |
62 | #define PORT_STATUS_DETECT_MASK GENMASK(3, 0) | |
63 | #define PORT_CLASS_UNKNOWN 0 | |
64 | #define PORT_CLASS_1 1 | |
65 | #define PORT_CLASS_2 2 | |
66 | #define PORT_CLASS_3 3 | |
67 | #define PORT_CLASS_4 4 | |
68 | #define PORT_CLASS_RESERVED 5 | |
69 | #define PORT_CLASS_0 6 | |
70 | #define PORT_CLASS_OVERCURRENT 7 | |
71 | #define PORT_CLASS_MISMATCH 8 | |
72 | #define PORT_DETECT_UNKNOWN 0 | |
73 | #define PORT_DETECT_SHORT 1 | |
74 | #define PORT_DETECT_RESERVED 2 | |
75 | #define PORT_DETECT_RESISTANCE_LOW 3 | |
76 | #define PORT_DETECT_RESISTANCE_OK 4 | |
77 | #define PORT_DETECT_RESISTANCE_HIGH 5 | |
78 | #define PORT_DETECT_OPEN_CIRCUIT 6 | |
79 | #define PORT_DETECT_RESERVED_2 7 | |
80 | #define PORT_DETECT_MOSFET_FAULT 8 | |
81 | #define PORT_DETECT_LEGACY 9 | |
82 | /* Measurment beyond clamp voltage */ | |
83 | #define PORT_DETECT_CAPACITANCE_INVALID_BEYOND 10 | |
84 | /* Insufficient voltage delta */ | |
85 | #define PORT_DETECT_CAPACITANCE_INVALID_DELTA 11 | |
86 | #define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE 12 | |
87 | #define POE_PLUS 0x40 | |
88 | #define OPERATING_MODE 0x12 | |
89 | #define OPERATING_MODE_OFF 0 | |
90 | #define OPERATING_MODE_MANUAL 1 | |
91 | #define OPERATING_MODE_SEMI 2 | |
92 | #define OPERATING_MODE_AUTO 3 | |
93 | #define OPERATING_MODE_PORT_1_MASK GENMASK(1, 0) | |
94 | #define OPERATING_MODE_PORT_2_MASK GENMASK(3, 2) | |
95 | #define OPERATING_MODE_PORT_3_MASK GENMASK(5, 4) | |
96 | #define OPERATING_MODE_PORT_4_MASK GENMASK(7, 6) | |
97 | ||
98 | #define DETECT_CLASS_RESTART 0x18 | |
99 | #define POWER_ENABLE 0x19 | |
100 | #define TPS23861_NUM_PORTS 4 | |
101 | ||
102 | #define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */ | |
103 | #define VOLTAGE_LSB 3662 /* 3.662 mV */ | |
104 | #define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */ | |
105 | #define CURRENT_LSB_255 62260 /* 62.260 uA */ | |
106 | #define CURRENT_LSB_250 61039 /* 61.039 uA */ | |
107 | #define RESISTANCE_LSB 110966 /* 11.0966 Ohm*/ | |
108 | #define RESISTANCE_LSB_LOW 157216 /* 15.7216 Ohm*/ | |
109 | ||
110 | struct tps23861_data { | |
111 | struct regmap *regmap; | |
112 | u32 shunt_resistor; | |
113 | struct i2c_client *client; | |
114 | struct dentry *debugfs_dir; | |
115 | }; | |
116 | ||
117 | static struct regmap_config tps23861_regmap_config = { | |
118 | .reg_bits = 8, | |
119 | .val_bits = 8, | |
120 | }; | |
121 | ||
122 | static int tps23861_read_temp(struct tps23861_data *data, long *val) | |
123 | { | |
124 | unsigned int regval; | |
125 | int err; | |
126 | ||
127 | err = regmap_read(data->regmap, TEMPERATURE, ®val); | |
128 | if (err < 0) | |
129 | return err; | |
130 | ||
131 | *val = (regval * TEMPERATURE_LSB) - 20000; | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | static int tps23861_read_voltage(struct tps23861_data *data, int channel, | |
137 | long *val) | |
138 | { | |
139 | unsigned int regval; | |
140 | int err; | |
141 | ||
142 | if (channel < TPS23861_NUM_PORTS) { | |
143 | err = regmap_bulk_read(data->regmap, | |
144 | PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET, | |
145 | ®val, 2); | |
146 | } else { | |
147 | err = regmap_bulk_read(data->regmap, | |
148 | INPUT_VOLTAGE_LSB, | |
149 | ®val, 2); | |
150 | } | |
151 | if (err < 0) | |
152 | return err; | |
153 | ||
154 | *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000; | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static int tps23861_read_current(struct tps23861_data *data, int channel, | |
160 | long *val) | |
161 | { | |
162 | unsigned int current_lsb; | |
163 | unsigned int regval; | |
164 | int err; | |
165 | ||
166 | if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT) | |
167 | current_lsb = CURRENT_LSB_255; | |
168 | else | |
169 | current_lsb = CURRENT_LSB_250; | |
170 | ||
171 | err = regmap_bulk_read(data->regmap, | |
172 | PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET, | |
173 | ®val, 2); | |
174 | if (err < 0) | |
175 | return err; | |
176 | ||
177 | *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000; | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static int tps23861_port_disable(struct tps23861_data *data, int channel) | |
183 | { | |
184 | unsigned int regval = 0; | |
185 | int err; | |
186 | ||
187 | regval |= BIT(channel + 4); | |
188 | err = regmap_write(data->regmap, POWER_ENABLE, regval); | |
189 | ||
190 | return err; | |
191 | } | |
192 | ||
193 | static int tps23861_port_enable(struct tps23861_data *data, int channel) | |
194 | { | |
195 | unsigned int regval = 0; | |
196 | int err; | |
197 | ||
198 | regval |= BIT(channel); | |
199 | regval |= BIT(channel + 4); | |
200 | err = regmap_write(data->regmap, DETECT_CLASS_RESTART, regval); | |
201 | ||
202 | return err; | |
203 | } | |
204 | ||
205 | static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type, | |
206 | u32 attr, int channel) | |
207 | { | |
208 | switch (type) { | |
209 | case hwmon_temp: | |
210 | switch (attr) { | |
211 | case hwmon_temp_input: | |
212 | case hwmon_temp_label: | |
213 | return 0444; | |
214 | default: | |
215 | return 0; | |
216 | } | |
217 | case hwmon_in: | |
218 | switch (attr) { | |
219 | case hwmon_in_input: | |
220 | case hwmon_in_label: | |
221 | return 0444; | |
222 | case hwmon_in_enable: | |
223 | return 0200; | |
224 | default: | |
225 | return 0; | |
226 | } | |
227 | case hwmon_curr: | |
228 | switch (attr) { | |
229 | case hwmon_curr_input: | |
230 | case hwmon_curr_label: | |
231 | return 0444; | |
232 | default: | |
233 | return 0; | |
234 | } | |
235 | default: | |
236 | return 0; | |
237 | } | |
238 | } | |
239 | ||
240 | static int tps23861_write(struct device *dev, enum hwmon_sensor_types type, | |
241 | u32 attr, int channel, long val) | |
242 | { | |
243 | struct tps23861_data *data = dev_get_drvdata(dev); | |
244 | int err; | |
245 | ||
246 | switch (type) { | |
247 | case hwmon_in: | |
248 | switch (attr) { | |
249 | case hwmon_in_enable: | |
250 | if (val == 0) | |
251 | err = tps23861_port_disable(data, channel); | |
252 | else if (val == 1) | |
253 | err = tps23861_port_enable(data, channel); | |
254 | else | |
255 | err = -EINVAL; | |
256 | break; | |
257 | default: | |
258 | return -EOPNOTSUPP; | |
259 | } | |
260 | break; | |
261 | default: | |
262 | return -EOPNOTSUPP; | |
263 | } | |
264 | ||
265 | return err; | |
266 | } | |
267 | ||
268 | static int tps23861_read(struct device *dev, enum hwmon_sensor_types type, | |
269 | u32 attr, int channel, long *val) | |
270 | { | |
271 | struct tps23861_data *data = dev_get_drvdata(dev); | |
272 | int err; | |
273 | ||
274 | switch (type) { | |
275 | case hwmon_temp: | |
276 | switch (attr) { | |
277 | case hwmon_temp_input: | |
278 | err = tps23861_read_temp(data, val); | |
279 | break; | |
280 | default: | |
281 | return -EOPNOTSUPP; | |
282 | } | |
283 | break; | |
284 | case hwmon_in: | |
285 | switch (attr) { | |
286 | case hwmon_in_input: | |
287 | err = tps23861_read_voltage(data, channel, val); | |
288 | break; | |
289 | default: | |
290 | return -EOPNOTSUPP; | |
291 | } | |
292 | break; | |
293 | case hwmon_curr: | |
294 | switch (attr) { | |
295 | case hwmon_curr_input: | |
296 | err = tps23861_read_current(data, channel, val); | |
297 | break; | |
298 | default: | |
299 | return -EOPNOTSUPP; | |
300 | } | |
301 | break; | |
302 | default: | |
303 | return -EOPNOTSUPP; | |
304 | } | |
305 | ||
306 | return err; | |
307 | } | |
308 | ||
309 | static const char * const tps23861_port_label[] = { | |
310 | "Port1", | |
311 | "Port2", | |
312 | "Port3", | |
313 | "Port4", | |
314 | "Input", | |
315 | }; | |
316 | ||
317 | static int tps23861_read_string(struct device *dev, | |
318 | enum hwmon_sensor_types type, | |
319 | u32 attr, int channel, const char **str) | |
320 | { | |
321 | switch (type) { | |
322 | case hwmon_in: | |
323 | case hwmon_curr: | |
324 | *str = tps23861_port_label[channel]; | |
325 | break; | |
326 | case hwmon_temp: | |
327 | *str = "Die"; | |
328 | break; | |
329 | default: | |
330 | return -EOPNOTSUPP; | |
331 | } | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static const struct hwmon_channel_info *tps23861_info[] = { | |
337 | HWMON_CHANNEL_INFO(chip, | |
338 | HWMON_C_REGISTER_TZ), | |
339 | HWMON_CHANNEL_INFO(temp, | |
340 | HWMON_T_INPUT | HWMON_T_LABEL), | |
341 | HWMON_CHANNEL_INFO(in, | |
342 | HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL, | |
343 | HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL, | |
344 | HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL, | |
345 | HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL, | |
346 | HWMON_I_INPUT | HWMON_I_LABEL), | |
347 | HWMON_CHANNEL_INFO(curr, | |
348 | HWMON_C_INPUT | HWMON_C_LABEL, | |
349 | HWMON_C_INPUT | HWMON_C_LABEL, | |
350 | HWMON_C_INPUT | HWMON_C_LABEL, | |
351 | HWMON_C_INPUT | HWMON_C_LABEL), | |
352 | NULL | |
353 | }; | |
354 | ||
355 | static const struct hwmon_ops tps23861_hwmon_ops = { | |
356 | .is_visible = tps23861_is_visible, | |
357 | .write = tps23861_write, | |
358 | .read = tps23861_read, | |
359 | .read_string = tps23861_read_string, | |
360 | }; | |
361 | ||
362 | static const struct hwmon_chip_info tps23861_chip_info = { | |
363 | .ops = &tps23861_hwmon_ops, | |
364 | .info = tps23861_info, | |
365 | }; | |
366 | ||
367 | static char *tps23861_port_operating_mode(struct tps23861_data *data, int port) | |
368 | { | |
369 | unsigned int regval; | |
370 | int mode; | |
371 | ||
372 | regmap_read(data->regmap, OPERATING_MODE, ®val); | |
373 | ||
374 | switch (port) { | |
375 | case 1: | |
376 | mode = FIELD_GET(OPERATING_MODE_PORT_1_MASK, regval); | |
377 | break; | |
378 | case 2: | |
379 | mode = FIELD_GET(OPERATING_MODE_PORT_2_MASK, regval); | |
380 | break; | |
381 | case 3: | |
382 | mode = FIELD_GET(OPERATING_MODE_PORT_3_MASK, regval); | |
383 | break; | |
384 | case 4: | |
385 | mode = FIELD_GET(OPERATING_MODE_PORT_4_MASK, regval); | |
386 | break; | |
387 | default: | |
388 | mode = -EINVAL; | |
389 | } | |
390 | ||
391 | switch (mode) { | |
392 | case OPERATING_MODE_OFF: | |
393 | return "Off"; | |
394 | case OPERATING_MODE_MANUAL: | |
395 | return "Manual"; | |
396 | case OPERATING_MODE_SEMI: | |
397 | return "Semi-Auto"; | |
398 | case OPERATING_MODE_AUTO: | |
399 | return "Auto"; | |
400 | default: | |
401 | return "Invalid"; | |
402 | } | |
403 | } | |
404 | ||
405 | static char *tps23861_port_detect_status(struct tps23861_data *data, int port) | |
406 | { | |
407 | unsigned int regval; | |
408 | ||
409 | regmap_read(data->regmap, | |
410 | PORT_1_STATUS + (port - 1), | |
411 | ®val); | |
412 | ||
413 | switch (FIELD_GET(PORT_STATUS_DETECT_MASK, regval)) { | |
414 | case PORT_DETECT_UNKNOWN: | |
415 | return "Unknown device"; | |
416 | case PORT_DETECT_SHORT: | |
417 | return "Short circuit"; | |
418 | case PORT_DETECT_RESISTANCE_LOW: | |
419 | return "Too low resistance"; | |
420 | case PORT_DETECT_RESISTANCE_OK: | |
421 | return "Valid resistance"; | |
422 | case PORT_DETECT_RESISTANCE_HIGH: | |
423 | return "Too high resistance"; | |
424 | case PORT_DETECT_OPEN_CIRCUIT: | |
425 | return "Open circuit"; | |
426 | case PORT_DETECT_MOSFET_FAULT: | |
427 | return "MOSFET fault"; | |
428 | case PORT_DETECT_LEGACY: | |
429 | return "Legacy device"; | |
430 | case PORT_DETECT_CAPACITANCE_INVALID_BEYOND: | |
431 | return "Invalid capacitance, beyond clamp voltage"; | |
432 | case PORT_DETECT_CAPACITANCE_INVALID_DELTA: | |
433 | return "Invalid capacitance, insufficient voltage delta"; | |
434 | case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE: | |
435 | return "Valid capacitance, outside of legacy range"; | |
436 | case PORT_DETECT_RESERVED: | |
437 | case PORT_DETECT_RESERVED_2: | |
438 | default: | |
439 | return "Invalid"; | |
440 | } | |
441 | } | |
442 | ||
443 | static char *tps23861_port_class_status(struct tps23861_data *data, int port) | |
444 | { | |
445 | unsigned int regval; | |
446 | ||
447 | regmap_read(data->regmap, | |
448 | PORT_1_STATUS + (port - 1), | |
449 | ®val); | |
450 | ||
451 | switch (FIELD_GET(PORT_STATUS_CLASS_MASK, regval)) { | |
452 | case PORT_CLASS_UNKNOWN: | |
453 | return "Unknown"; | |
454 | case PORT_CLASS_RESERVED: | |
455 | case PORT_CLASS_0: | |
456 | return "0"; | |
457 | case PORT_CLASS_1: | |
458 | return "1"; | |
459 | case PORT_CLASS_2: | |
460 | return "2"; | |
461 | case PORT_CLASS_3: | |
462 | return "3"; | |
463 | case PORT_CLASS_4: | |
464 | return "4"; | |
465 | case PORT_CLASS_OVERCURRENT: | |
466 | return "Overcurrent"; | |
467 | case PORT_CLASS_MISMATCH: | |
468 | return "Mismatch"; | |
469 | default: | |
470 | return "Invalid"; | |
471 | } | |
472 | } | |
473 | ||
474 | static char *tps23861_port_poe_plus_status(struct tps23861_data *data, int port) | |
475 | { | |
476 | unsigned int regval; | |
477 | ||
478 | regmap_read(data->regmap, POE_PLUS, ®val); | |
479 | ||
480 | if (BIT(port + 3) & regval) | |
481 | return "Yes"; | |
482 | else | |
483 | return "No"; | |
484 | } | |
485 | ||
486 | static int tps23861_port_resistance(struct tps23861_data *data, int port) | |
487 | { | |
488 | u16 regval; | |
489 | ||
490 | regmap_bulk_read(data->regmap, | |
491 | PORT_1_RESISTANCE_LSB + PORT_N_RESISTANCE_LSB_OFFSET * (port - 1), | |
492 | ®val, | |
493 | 2); | |
494 | ||
495 | switch (FIELD_GET(PORT_RESISTANCE_RSN_MASK, regval)) { | |
496 | case PORT_RESISTANCE_RSN_OTHER: | |
497 | return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB) / 10000; | |
498 | case PORT_RESISTANCE_RSN_LOW: | |
499 | return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB_LOW) / 10000; | |
500 | case PORT_RESISTANCE_RSN_SHORT: | |
501 | case PORT_RESISTANCE_RSN_OPEN: | |
502 | default: | |
503 | return 0; | |
504 | } | |
505 | } | |
506 | ||
507 | static int tps23861_port_status_show(struct seq_file *s, void *data) | |
508 | { | |
509 | struct tps23861_data *priv = s->private; | |
510 | int i; | |
511 | ||
512 | for (i = 1; i < TPS23861_NUM_PORTS + 1; i++) { | |
513 | seq_printf(s, "Port: \t\t%d\n", i); | |
514 | seq_printf(s, "Operating mode: %s\n", tps23861_port_operating_mode(priv, i)); | |
515 | seq_printf(s, "Detected: \t%s\n", tps23861_port_detect_status(priv, i)); | |
516 | seq_printf(s, "Class: \t\t%s\n", tps23861_port_class_status(priv, i)); | |
517 | seq_printf(s, "PoE Plus: \t%s\n", tps23861_port_poe_plus_status(priv, i)); | |
518 | seq_printf(s, "Resistance: \t%d\n", tps23861_port_resistance(priv, i)); | |
519 | seq_putc(s, '\n'); | |
520 | } | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | DEFINE_SHOW_ATTRIBUTE(tps23861_port_status); | |
526 | ||
527 | static void tps23861_init_debugfs(struct tps23861_data *data) | |
528 | { | |
529 | data->debugfs_dir = debugfs_create_dir(data->client->name, NULL); | |
530 | ||
531 | debugfs_create_file("port_status", | |
532 | 0400, | |
533 | data->debugfs_dir, | |
534 | data, | |
535 | &tps23861_port_status_fops); | |
536 | } | |
537 | ||
538 | static int tps23861_probe(struct i2c_client *client) | |
539 | { | |
540 | struct device *dev = &client->dev; | |
541 | struct tps23861_data *data; | |
542 | struct device *hwmon_dev; | |
543 | u32 shunt_resistor; | |
544 | ||
545 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
546 | if (!data) | |
547 | return -ENOMEM; | |
548 | ||
549 | data->client = client; | |
550 | i2c_set_clientdata(client, data); | |
551 | ||
552 | data->regmap = devm_regmap_init_i2c(client, &tps23861_regmap_config); | |
553 | if (IS_ERR(data->regmap)) { | |
554 | dev_err(dev, "failed to allocate register map\n"); | |
555 | return PTR_ERR(data->regmap); | |
556 | } | |
557 | ||
558 | if (!of_property_read_u32(dev->of_node, "shunt-resistor-micro-ohms", &shunt_resistor)) | |
559 | data->shunt_resistor = shunt_resistor; | |
560 | else | |
561 | data->shunt_resistor = SHUNT_RESISTOR_DEFAULT; | |
562 | ||
563 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, | |
564 | data, &tps23861_chip_info, | |
565 | NULL); | |
566 | if (IS_ERR(hwmon_dev)) | |
567 | return PTR_ERR(hwmon_dev); | |
568 | ||
569 | tps23861_init_debugfs(data); | |
570 | ||
571 | return 0; | |
572 | } | |
573 | ||
574 | static int tps23861_remove(struct i2c_client *client) | |
575 | { | |
576 | struct tps23861_data *data = i2c_get_clientdata(client); | |
577 | ||
578 | debugfs_remove_recursive(data->debugfs_dir); | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | static const struct of_device_id __maybe_unused tps23861_of_match[] = { | |
584 | { .compatible = "ti,tps23861", }, | |
585 | { }, | |
586 | }; | |
587 | MODULE_DEVICE_TABLE(of, tps23861_of_match); | |
588 | ||
589 | static struct i2c_driver tps23861_driver = { | |
590 | .probe_new = tps23861_probe, | |
591 | .remove = tps23861_remove, | |
592 | .driver = { | |
593 | .name = "tps23861", | |
594 | .of_match_table = of_match_ptr(tps23861_of_match), | |
595 | }, | |
596 | }; | |
597 | module_i2c_driver(tps23861_driver); | |
598 | ||
599 | MODULE_LICENSE("GPL"); | |
600 | MODULE_AUTHOR("Robert Marko <robert.marko@sartura.hr>"); | |
601 | MODULE_DESCRIPTION("TI TPS23861 PoE PSE"); |