xref: /linux/drivers/hwmon/ltc2945.c (revision 621cde16e49b3ecf7d59a8106a20aaebfb4a59a9)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Driver for Linear Technology LTC2945 I2C Power Monitor
4  *
5  * Copyright (c) 2014 Guenter Roeck
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/err.h>
11 #include <linux/slab.h>
12 #include <linux/i2c.h>
13 #include <linux/hwmon.h>
14 #include <linux/hwmon-sysfs.h>
15 #include <linux/jiffies.h>
16 #include <linux/regmap.h>
17 
18 /* chip registers */
19 #define LTC2945_CONTROL			0x00
20 #define LTC2945_ALERT			0x01
21 #define LTC2945_STATUS			0x02
22 #define LTC2945_FAULT			0x03
23 #define LTC2945_POWER_H			0x05
24 #define LTC2945_MAX_POWER_H		0x08
25 #define LTC2945_MIN_POWER_H		0x0b
26 #define LTC2945_MAX_POWER_THRES_H	0x0e
27 #define LTC2945_MIN_POWER_THRES_H	0x11
28 #define LTC2945_SENSE_H			0x14
29 #define LTC2945_MAX_SENSE_H		0x16
30 #define LTC2945_MIN_SENSE_H		0x18
31 #define LTC2945_MAX_SENSE_THRES_H	0x1a
32 #define LTC2945_MIN_SENSE_THRES_H	0x1c
33 #define LTC2945_VIN_H			0x1e
34 #define LTC2945_MAX_VIN_H		0x20
35 #define LTC2945_MIN_VIN_H		0x22
36 #define LTC2945_MAX_VIN_THRES_H		0x24
37 #define LTC2945_MIN_VIN_THRES_H		0x26
38 #define LTC2945_ADIN_H			0x28
39 #define LTC2945_MAX_ADIN_H		0x2a
40 #define LTC2945_MIN_ADIN_H		0x2c
41 #define LTC2945_MAX_ADIN_THRES_H	0x2e
42 #define LTC2945_MIN_ADIN_THRES_H	0x30
43 #define LTC2945_MIN_ADIN_THRES_L	0x31
44 
45 /* Fault register bits */
46 
47 #define FAULT_ADIN_UV		(1 << 0)
48 #define FAULT_ADIN_OV		(1 << 1)
49 #define FAULT_VIN_UV		(1 << 2)
50 #define FAULT_VIN_OV		(1 << 3)
51 #define FAULT_SENSE_UV		(1 << 4)
52 #define FAULT_SENSE_OV		(1 << 5)
53 #define FAULT_POWER_UV		(1 << 6)
54 #define FAULT_POWER_OV		(1 << 7)
55 
56 /* Control register bits */
57 
58 #define CONTROL_MULT_SELECT	(1 << 0)
59 #define CONTROL_TEST_MODE	(1 << 4)
60 
61 static const struct of_device_id __maybe_unused ltc2945_of_match[] = {
62 	{ .compatible = "adi,ltc2945" },
63 	{ }
64 };
65 MODULE_DEVICE_TABLE(of, ltc2945_of_match);
66 
67 /**
68  * struct ltc2945_data - LTC2945 device data
69  * @regmap: regmap device
70  * @shunt_resistor: shunt resistor value in micro ohms (1000 by default)
71  */
72 struct ltc2945_data {
73 	struct regmap *regmap;
74 	u32 shunt_resistor;
75 };
76 
is_power_reg(u8 reg)77 static inline bool is_power_reg(u8 reg)
78 {
79 	return reg < LTC2945_SENSE_H;
80 }
81 
82 /* Return the value from the given register in uW, mV, or mA */
ltc2945_reg_to_val(struct device * dev,u8 reg)83 static long long ltc2945_reg_to_val(struct device *dev, u8 reg)
84 {
85 	struct ltc2945_data *data = dev_get_drvdata(dev);
86 	struct regmap *regmap = data->regmap;
87 	u32 shunt_resistor = data->shunt_resistor;
88 	unsigned int control;
89 	u8 buf[3];
90 	long long val;
91 	int ret;
92 
93 	ret = regmap_bulk_read(regmap, reg, buf,
94 			       is_power_reg(reg) ? 3 : 2);
95 	if (ret < 0)
96 		return ret;
97 
98 	if (is_power_reg(reg)) {
99 		/* 24-bit power */
100 		val = (buf[0] << 16) + (buf[1] << 8) + buf[2];
101 	} else {
102 		/* 12-bit current, voltage */
103 		val = (buf[0] << 4) + (buf[1] >> 4);
104 	}
105 
106 	switch (reg) {
107 	case LTC2945_POWER_H:
108 	case LTC2945_MAX_POWER_H:
109 	case LTC2945_MIN_POWER_H:
110 	case LTC2945_MAX_POWER_THRES_H:
111 	case LTC2945_MIN_POWER_THRES_H:
112 		/*
113 		 * Convert to uW
114 		 * Control register bit 0 selects if voltage at SENSE+/VDD
115 		 * or voltage at ADIN is used to measure power.
116 		 */
117 		ret = regmap_read(regmap, LTC2945_CONTROL, &control);
118 		if (ret < 0)
119 			return ret;
120 		if (control & CONTROL_MULT_SELECT) {
121 			/* 25 mV * 25 uV = 0.625 uV resolution. */
122 			val *= 625LL;
123 		} else {
124 			/* 0.5 mV * 25 uV = 0.0125 uV resolution. */
125 			val = (val * 25LL) >> 1;
126 		}
127 		val *= 1000;
128 		/* Overflow check: Assuming max 24-bit power, val is at most 53 bits right now. */
129 		val = DIV_ROUND_CLOSEST_ULL(val, shunt_resistor);
130 		/*
131 		 * Overflow check: After division, depending on shunt resistor,
132 		 * val can still be > 32 bits so returning long long makes sense
133 		 */
134 
135 		break;
136 	case LTC2945_VIN_H:
137 	case LTC2945_MAX_VIN_H:
138 	case LTC2945_MIN_VIN_H:
139 	case LTC2945_MAX_VIN_THRES_H:
140 	case LTC2945_MIN_VIN_THRES_H:
141 		/* 25 mV resolution. Convert to mV. */
142 		val *= 25;
143 		break;
144 	case LTC2945_ADIN_H:
145 	case LTC2945_MAX_ADIN_H:
146 	case LTC2945_MIN_ADIN_THRES_H:
147 	case LTC2945_MAX_ADIN_THRES_H:
148 	case LTC2945_MIN_ADIN_H:
149 		/* 0.5mV resolution. Convert to mV. */
150 		val = val >> 1;
151 		break;
152 	case LTC2945_SENSE_H:
153 	case LTC2945_MAX_SENSE_H:
154 	case LTC2945_MIN_SENSE_H:
155 	case LTC2945_MAX_SENSE_THRES_H:
156 	case LTC2945_MIN_SENSE_THRES_H:
157 		/* 25 uV resolution. Convert to mA. */
158 		val *= 25 * 1000;
159 		/* Overflow check: Assuming max 12-bit sense, val is at most 27 bits right now */
160 		val = DIV_ROUND_CLOSEST_ULL(val, shunt_resistor);
161 		/* Overflow check: After division, <= 27 bits */
162 		break;
163 	default:
164 		return -EINVAL;
165 	}
166 	return val;
167 }
168 
ltc2945_val_to_reg(struct device * dev,u8 reg,unsigned long long val)169 static long long ltc2945_val_to_reg(struct device *dev, u8 reg,
170 				    unsigned long long val)
171 {
172 	struct ltc2945_data *data = dev_get_drvdata(dev);
173 	struct regmap *regmap = data->regmap;
174 	u32 shunt_resistor = data->shunt_resistor;
175 	unsigned int control;
176 	int ret;
177 
178 	/* Ensure we don't overflow */
179 	val = clamp_val(val, 0, U32_MAX);
180 
181 	switch (reg) {
182 	case LTC2945_POWER_H:
183 	case LTC2945_MAX_POWER_H:
184 	case LTC2945_MIN_POWER_H:
185 	case LTC2945_MAX_POWER_THRES_H:
186 	case LTC2945_MIN_POWER_THRES_H:
187 		/*
188 		 * Control register bit 0 selects if voltage at SENSE+/VDD
189 		 * or voltage at ADIN is used to measure power, which in turn
190 		 * determines register calculations.
191 		 */
192 		ret = regmap_read(regmap, LTC2945_CONTROL, &control);
193 		if (ret < 0)
194 			return ret;
195 		if (control & CONTROL_MULT_SELECT) {
196 			/* 25 mV * 25 uV = 0.625 uV resolution. */
197 			val *= shunt_resistor;
198 			/* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */
199 			val = DIV_ROUND_CLOSEST_ULL(val, 625 * 1000);
200 			/* Overflow check: val is now <= 44 bits */
201 		} else {
202 			/* 0.5 mV * 25 uV = 0.0125 uV resolution. */
203 			val *= shunt_resistor;
204 			/* Overflow check: Assuming 32-bit val and shunt resistor, val <= 64bits */
205 			val = DIV_ROUND_CLOSEST_ULL(val, 25 * 1000) * 2;
206 			/* Overflow check: val is now <= 51 bits */
207 		}
208 		break;
209 	case LTC2945_VIN_H:
210 	case LTC2945_MAX_VIN_H:
211 	case LTC2945_MIN_VIN_H:
212 	case LTC2945_MAX_VIN_THRES_H:
213 	case LTC2945_MIN_VIN_THRES_H:
214 		/* 25 mV resolution. */
215 		val = DIV_ROUND_CLOSEST_ULL(val, 25);
216 		break;
217 	case LTC2945_ADIN_H:
218 	case LTC2945_MAX_ADIN_H:
219 	case LTC2945_MIN_ADIN_THRES_H:
220 	case LTC2945_MAX_ADIN_THRES_H:
221 	case LTC2945_MIN_ADIN_H:
222 		/* 0.5mV resolution. */
223 		val *= 2;
224 		break;
225 	case LTC2945_SENSE_H:
226 	case LTC2945_MAX_SENSE_H:
227 	case LTC2945_MIN_SENSE_H:
228 	case LTC2945_MAX_SENSE_THRES_H:
229 	case LTC2945_MIN_SENSE_THRES_H:
230 		/* 25 uV resolution. Convert to  mA. */
231 		val *= shunt_resistor;
232 		/* Overflow check: Assuming 32-bit val and 32-bit shunt resistor, val is 64bits */
233 		val = DIV_ROUND_CLOSEST_ULL(val, 25 * 1000);
234 		/* Overflow check: val is now <= 50 bits */
235 		break;
236 	default:
237 		return -EINVAL;
238 	}
239 	return val;
240 }
241 
ltc2945_value_show(struct device * dev,struct device_attribute * da,char * buf)242 static ssize_t ltc2945_value_show(struct device *dev,
243 				  struct device_attribute *da, char *buf)
244 {
245 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
246 	long long value;
247 
248 	value = ltc2945_reg_to_val(dev, attr->index);
249 	if (value < 0)
250 		return value;
251 	return sysfs_emit(buf, "%lld\n", value);
252 }
253 
ltc2945_value_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)254 static ssize_t ltc2945_value_store(struct device *dev,
255 				   struct device_attribute *da,
256 				   const char *buf, size_t count)
257 {
258 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
259 	struct ltc2945_data *data = dev_get_drvdata(dev);
260 	struct regmap *regmap = data->regmap;
261 	u8 reg = attr->index;
262 	unsigned int val;
263 	u8 regbuf[3];
264 	int num_regs;
265 	long long regval;
266 	int ret;
267 
268 	ret = kstrtouint(buf, 10, &val);
269 	if (ret)
270 		return ret;
271 
272 	/* convert to register value, then clamp and write result */
273 	regval = ltc2945_val_to_reg(dev, reg, val);
274 	if (regval < 0)
275 		return regval;
276 	if (is_power_reg(reg)) {
277 		regval = clamp_val(regval, 0, 0xffffff);
278 		regbuf[0] = regval >> 16;
279 		regbuf[1] = (regval >> 8) & 0xff;
280 		regbuf[2] = regval;
281 		num_regs = 3;
282 	} else {
283 		regval = clamp_val(regval, 0, 0xfff) << 4;
284 		regbuf[0] = regval >> 8;
285 		regbuf[1] = regval & 0xff;
286 		num_regs = 2;
287 	}
288 	ret = regmap_bulk_write(regmap, reg, regbuf, num_regs);
289 	return ret < 0 ? ret : count;
290 }
291 
ltc2945_history_store(struct device * dev,struct device_attribute * da,const char * buf,size_t count)292 static ssize_t ltc2945_history_store(struct device *dev,
293 				     struct device_attribute *da,
294 				     const char *buf, size_t count)
295 {
296 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
297 	struct ltc2945_data *data = dev_get_drvdata(dev);
298 	struct regmap *regmap = data->regmap;
299 	u8 reg = attr->index;
300 	int num_regs = is_power_reg(reg) ? 3 : 2;
301 	u8 buf_min[3] = { 0xff, 0xff, 0xff };
302 	u8 buf_max[3] = { 0, 0, 0 };
303 	unsigned long val;
304 	int ret;
305 
306 	ret = kstrtoul(buf, 10, &val);
307 	if (ret)
308 		return ret;
309 	if (val != 1)
310 		return -EINVAL;
311 
312 	ret = regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE,
313 				 CONTROL_TEST_MODE);
314 
315 	/* Reset minimum */
316 	ret = regmap_bulk_write(regmap, reg, buf_min, num_regs);
317 	if (ret)
318 		return ret;
319 
320 	switch (reg) {
321 	case LTC2945_MIN_POWER_H:
322 		reg = LTC2945_MAX_POWER_H;
323 		break;
324 	case LTC2945_MIN_SENSE_H:
325 		reg = LTC2945_MAX_SENSE_H;
326 		break;
327 	case LTC2945_MIN_VIN_H:
328 		reg = LTC2945_MAX_VIN_H;
329 		break;
330 	case LTC2945_MIN_ADIN_H:
331 		reg = LTC2945_MAX_ADIN_H;
332 		break;
333 	default:
334 		WARN_ONCE(1, "Bad register: 0x%x\n", reg);
335 		return -EINVAL;
336 	}
337 	/* Reset maximum */
338 	ret = regmap_bulk_write(regmap, reg, buf_max, num_regs);
339 
340 	/* Try resetting test mode even if there was an error */
341 	regmap_update_bits(regmap, LTC2945_CONTROL, CONTROL_TEST_MODE, 0);
342 
343 	return ret ? : count;
344 }
345 
ltc2945_bool_show(struct device * dev,struct device_attribute * da,char * buf)346 static ssize_t ltc2945_bool_show(struct device *dev,
347 				 struct device_attribute *da, char *buf)
348 {
349 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
350 	struct ltc2945_data *data = dev_get_drvdata(dev);
351 	struct regmap *regmap = data->regmap;
352 	unsigned int fault;
353 	int ret;
354 
355 	ret = regmap_read(regmap, LTC2945_FAULT, &fault);
356 	if (ret < 0)
357 		return ret;
358 
359 	fault &= attr->index;
360 	if (fault)		/* Clear reported faults in chip register */
361 		regmap_update_bits(regmap, LTC2945_FAULT, attr->index, 0);
362 
363 	return sysfs_emit(buf, "%d\n", !!fault);
364 }
365 
366 /* Input voltages */
367 
368 static SENSOR_DEVICE_ATTR_RO(in1_input, ltc2945_value, LTC2945_VIN_H);
369 static SENSOR_DEVICE_ATTR_RW(in1_min, ltc2945_value, LTC2945_MIN_VIN_THRES_H);
370 static SENSOR_DEVICE_ATTR_RW(in1_max, ltc2945_value, LTC2945_MAX_VIN_THRES_H);
371 static SENSOR_DEVICE_ATTR_RO(in1_lowest, ltc2945_value, LTC2945_MIN_VIN_H);
372 static SENSOR_DEVICE_ATTR_RO(in1_highest, ltc2945_value, LTC2945_MAX_VIN_H);
373 static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ltc2945_history,
374 			     LTC2945_MIN_VIN_H);
375 
376 static SENSOR_DEVICE_ATTR_RO(in2_input, ltc2945_value, LTC2945_ADIN_H);
377 static SENSOR_DEVICE_ATTR_RW(in2_min, ltc2945_value, LTC2945_MIN_ADIN_THRES_H);
378 static SENSOR_DEVICE_ATTR_RW(in2_max, ltc2945_value, LTC2945_MAX_ADIN_THRES_H);
379 static SENSOR_DEVICE_ATTR_RO(in2_lowest, ltc2945_value, LTC2945_MIN_ADIN_H);
380 static SENSOR_DEVICE_ATTR_RO(in2_highest, ltc2945_value, LTC2945_MAX_ADIN_H);
381 static SENSOR_DEVICE_ATTR_WO(in2_reset_history, ltc2945_history,
382 			     LTC2945_MIN_ADIN_H);
383 
384 /* Voltage alarms */
385 
386 static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ltc2945_bool, FAULT_VIN_UV);
387 static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ltc2945_bool, FAULT_VIN_OV);
388 static SENSOR_DEVICE_ATTR_RO(in2_min_alarm, ltc2945_bool, FAULT_ADIN_UV);
389 static SENSOR_DEVICE_ATTR_RO(in2_max_alarm, ltc2945_bool, FAULT_ADIN_OV);
390 
391 /* Currents (via sense resistor) */
392 
393 static SENSOR_DEVICE_ATTR_RO(curr1_input, ltc2945_value, LTC2945_SENSE_H);
394 static SENSOR_DEVICE_ATTR_RW(curr1_min, ltc2945_value,
395 			     LTC2945_MIN_SENSE_THRES_H);
396 static SENSOR_DEVICE_ATTR_RW(curr1_max, ltc2945_value,
397 			     LTC2945_MAX_SENSE_THRES_H);
398 static SENSOR_DEVICE_ATTR_RO(curr1_lowest, ltc2945_value, LTC2945_MIN_SENSE_H);
399 static SENSOR_DEVICE_ATTR_RO(curr1_highest, ltc2945_value,
400 			     LTC2945_MAX_SENSE_H);
401 static SENSOR_DEVICE_ATTR_WO(curr1_reset_history, ltc2945_history,
402 			     LTC2945_MIN_SENSE_H);
403 
404 /* Current alarms */
405 
406 static SENSOR_DEVICE_ATTR_RO(curr1_min_alarm, ltc2945_bool, FAULT_SENSE_UV);
407 static SENSOR_DEVICE_ATTR_RO(curr1_max_alarm, ltc2945_bool, FAULT_SENSE_OV);
408 
409 /* Power */
410 
411 static SENSOR_DEVICE_ATTR_RO(power1_input, ltc2945_value, LTC2945_POWER_H);
412 static SENSOR_DEVICE_ATTR_RW(power1_min, ltc2945_value,
413 			     LTC2945_MIN_POWER_THRES_H);
414 static SENSOR_DEVICE_ATTR_RW(power1_max, ltc2945_value,
415 			     LTC2945_MAX_POWER_THRES_H);
416 static SENSOR_DEVICE_ATTR_RO(power1_input_lowest, ltc2945_value,
417 			     LTC2945_MIN_POWER_H);
418 static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ltc2945_value,
419 			     LTC2945_MAX_POWER_H);
420 static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ltc2945_history,
421 			     LTC2945_MIN_POWER_H);
422 
423 /* Power alarms */
424 
425 static SENSOR_DEVICE_ATTR_RO(power1_min_alarm, ltc2945_bool, FAULT_POWER_UV);
426 static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ltc2945_bool, FAULT_POWER_OV);
427 
428 static struct attribute *ltc2945_attrs[] = {
429 	&sensor_dev_attr_in1_input.dev_attr.attr,
430 	&sensor_dev_attr_in1_min.dev_attr.attr,
431 	&sensor_dev_attr_in1_max.dev_attr.attr,
432 	&sensor_dev_attr_in1_lowest.dev_attr.attr,
433 	&sensor_dev_attr_in1_highest.dev_attr.attr,
434 	&sensor_dev_attr_in1_reset_history.dev_attr.attr,
435 	&sensor_dev_attr_in1_min_alarm.dev_attr.attr,
436 	&sensor_dev_attr_in1_max_alarm.dev_attr.attr,
437 
438 	&sensor_dev_attr_in2_input.dev_attr.attr,
439 	&sensor_dev_attr_in2_min.dev_attr.attr,
440 	&sensor_dev_attr_in2_max.dev_attr.attr,
441 	&sensor_dev_attr_in2_lowest.dev_attr.attr,
442 	&sensor_dev_attr_in2_highest.dev_attr.attr,
443 	&sensor_dev_attr_in2_reset_history.dev_attr.attr,
444 	&sensor_dev_attr_in2_min_alarm.dev_attr.attr,
445 	&sensor_dev_attr_in2_max_alarm.dev_attr.attr,
446 
447 	&sensor_dev_attr_curr1_input.dev_attr.attr,
448 	&sensor_dev_attr_curr1_min.dev_attr.attr,
449 	&sensor_dev_attr_curr1_max.dev_attr.attr,
450 	&sensor_dev_attr_curr1_lowest.dev_attr.attr,
451 	&sensor_dev_attr_curr1_highest.dev_attr.attr,
452 	&sensor_dev_attr_curr1_reset_history.dev_attr.attr,
453 	&sensor_dev_attr_curr1_min_alarm.dev_attr.attr,
454 	&sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
455 
456 	&sensor_dev_attr_power1_input.dev_attr.attr,
457 	&sensor_dev_attr_power1_min.dev_attr.attr,
458 	&sensor_dev_attr_power1_max.dev_attr.attr,
459 	&sensor_dev_attr_power1_input_lowest.dev_attr.attr,
460 	&sensor_dev_attr_power1_input_highest.dev_attr.attr,
461 	&sensor_dev_attr_power1_reset_history.dev_attr.attr,
462 	&sensor_dev_attr_power1_min_alarm.dev_attr.attr,
463 	&sensor_dev_attr_power1_max_alarm.dev_attr.attr,
464 
465 	NULL,
466 };
467 ATTRIBUTE_GROUPS(ltc2945);
468 
469 static const struct regmap_config ltc2945_regmap_config = {
470 	.reg_bits = 8,
471 	.val_bits = 8,
472 	.max_register = LTC2945_MIN_ADIN_THRES_L,
473 };
474 
ltc2945_probe(struct i2c_client * client)475 static int ltc2945_probe(struct i2c_client *client)
476 {
477 	struct device *dev = &client->dev;
478 	struct device *hwmon_dev;
479 	struct regmap *regmap;
480 	struct ltc2945_data *data;
481 
482 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
483 	if (!data)
484 		return -ENOMEM;
485 	dev_set_drvdata(dev, data);
486 
487 	regmap = devm_regmap_init_i2c(client, &ltc2945_regmap_config);
488 	if (IS_ERR(regmap)) {
489 		dev_err(dev, "failed to allocate register map\n");
490 		return PTR_ERR(regmap);
491 	}
492 
493 	data->regmap = regmap;
494 	if (device_property_read_u32(dev, "shunt-resistor-micro-ohms",
495 				     &data->shunt_resistor))
496 		data->shunt_resistor = 1000;
497 
498 	if (data->shunt_resistor == 0)
499 		return -EINVAL;
500 
501 	/* Clear faults */
502 	regmap_write(regmap, LTC2945_FAULT, 0x00);
503 
504 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
505 							   data,
506 							   ltc2945_groups);
507 	return PTR_ERR_OR_ZERO(hwmon_dev);
508 }
509 
510 static const struct i2c_device_id ltc2945_id[] = {
511 	{"ltc2945"},
512 	{ }
513 };
514 
515 MODULE_DEVICE_TABLE(i2c, ltc2945_id);
516 
517 static struct i2c_driver ltc2945_driver = {
518 	.driver = {
519 		.name = "ltc2945",
520 		.of_match_table = of_match_ptr(ltc2945_of_match),
521 	},
522 	.probe = ltc2945_probe,
523 	.id_table = ltc2945_id,
524 };
525 
526 module_i2c_driver(ltc2945_driver);
527 
528 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
529 MODULE_DESCRIPTION("LTC2945 driver");
530 MODULE_LICENSE("GPL");
531