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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for the Texas Instruments / Burr Brown INA209
4 * Bidirectional Current/Power Monitor
5 *
6 * Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
7 *
8 * Derived from Ira W. Snyder's original driver submission
9 * Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca>
10 * Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu>
11 *
12 * Aligned with ina2xx driver
13 * Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
14 * Thanks to Jan Volkering
15 *
16 * Datasheet:
17 * https://www.ti.com/lit/gpn/ina209
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/err.h>
24#include <linux/slab.h>
25#include <linux/bug.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29
30#include <linux/platform_data/ina2xx.h>
31
32/* register definitions */
33#define INA209_CONFIGURATION 0x00
34#define INA209_STATUS 0x01
35#define INA209_STATUS_MASK 0x02
36#define INA209_SHUNT_VOLTAGE 0x03
37#define INA209_BUS_VOLTAGE 0x04
38#define INA209_POWER 0x05
39#define INA209_CURRENT 0x06
40#define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07
41#define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08
42#define INA209_BUS_VOLTAGE_MAX_PEAK 0x09
43#define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a
44#define INA209_POWER_PEAK 0x0b
45#define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c
46#define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d
47#define INA209_POWER_WARN 0x0e
48#define INA209_BUS_VOLTAGE_OVER_WARN 0x0f
49#define INA209_BUS_VOLTAGE_UNDER_WARN 0x10
50#define INA209_POWER_OVER_LIMIT 0x11
51#define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12
52#define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13
53#define INA209_CRITICAL_DAC_POS 0x14
54#define INA209_CRITICAL_DAC_NEG 0x15
55#define INA209_CALIBRATION 0x16
56
57#define INA209_REGISTERS 0x17
58
59#define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */
60#define INA209_SHUNT_DEFAULT 10000 /* uOhm */
61
62struct ina209_data {
63 struct i2c_client *client;
64
65 struct mutex update_lock;
66 bool valid;
67 unsigned long last_updated; /* in jiffies */
68
69 u16 regs[INA209_REGISTERS]; /* All chip registers */
70
71 u16 config_orig; /* Original configuration */
72 u16 calibration_orig; /* Original calibration */
73 u16 update_interval;
74};
75
76static struct ina209_data *ina209_update_device(struct device *dev)
77{
78 struct ina209_data *data = dev_get_drvdata(dev);
79 struct i2c_client *client = data->client;
80 struct ina209_data *ret = data;
81 s32 val;
82 int i;
83
84 mutex_lock(&data->update_lock);
85
86 if (!data->valid ||
87 time_after(jiffies, data->last_updated + data->update_interval)) {
88 for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
89 val = i2c_smbus_read_word_swapped(client, i);
90 if (val < 0) {
91 ret = ERR_PTR(val);
92 goto abort;
93 }
94 data->regs[i] = val;
95 }
96 data->last_updated = jiffies;
97 data->valid = true;
98 }
99abort:
100 mutex_unlock(&data->update_lock);
101 return ret;
102}
103
104/*
105 * Read a value from a device register and convert it to the
106 * appropriate sysfs units
107 */
108static long ina209_from_reg(const u8 reg, const u16 val)
109{
110 switch (reg) {
111 case INA209_SHUNT_VOLTAGE:
112 case INA209_SHUNT_VOLTAGE_POS_PEAK:
113 case INA209_SHUNT_VOLTAGE_NEG_PEAK:
114 case INA209_SHUNT_VOLTAGE_POS_WARN:
115 case INA209_SHUNT_VOLTAGE_NEG_WARN:
116 /* LSB=10 uV. Convert to mV. */
117 return DIV_ROUND_CLOSEST((s16)val, 100);
118
119 case INA209_BUS_VOLTAGE:
120 case INA209_BUS_VOLTAGE_MAX_PEAK:
121 case INA209_BUS_VOLTAGE_MIN_PEAK:
122 case INA209_BUS_VOLTAGE_OVER_WARN:
123 case INA209_BUS_VOLTAGE_UNDER_WARN:
124 case INA209_BUS_VOLTAGE_OVER_LIMIT:
125 case INA209_BUS_VOLTAGE_UNDER_LIMIT:
126 /* LSB=4 mV, last 3 bits unused */
127 return (val >> 3) * 4;
128
129 case INA209_CRITICAL_DAC_POS:
130 /* LSB=1 mV, in the upper 8 bits */
131 return val >> 8;
132
133 case INA209_CRITICAL_DAC_NEG:
134 /* LSB=1 mV, in the upper 8 bits */
135 return -1 * (val >> 8);
136
137 case INA209_POWER:
138 case INA209_POWER_PEAK:
139 case INA209_POWER_WARN:
140 case INA209_POWER_OVER_LIMIT:
141 /* LSB=20 mW. Convert to uW */
142 return val * 20 * 1000L;
143
144 case INA209_CURRENT:
145 /* LSB=1 mA (selected). Is in mA */
146 return (s16)val;
147 }
148
149 /* programmer goofed */
150 WARN_ON_ONCE(1);
151 return 0;
152}
153
154/*
155 * Take a value and convert it to register format, clamping the value
156 * to the appropriate range.
157 */
158static int ina209_to_reg(u8 reg, u16 old, long val)
159{
160 switch (reg) {
161 case INA209_SHUNT_VOLTAGE_POS_WARN:
162 case INA209_SHUNT_VOLTAGE_NEG_WARN:
163 /* Limit to +- 320 mV, 10 uV LSB */
164 return clamp_val(val, -320, 320) * 100;
165
166 case INA209_BUS_VOLTAGE_OVER_WARN:
167 case INA209_BUS_VOLTAGE_UNDER_WARN:
168 case INA209_BUS_VOLTAGE_OVER_LIMIT:
169 case INA209_BUS_VOLTAGE_UNDER_LIMIT:
170 /*
171 * Limit to 0-32000 mV, 4 mV LSB
172 *
173 * The last three bits aren't part of the value, but we'll
174 * preserve them in their original state.
175 */
176 return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3)
177 | (old & 0x7);
178
179 case INA209_CRITICAL_DAC_NEG:
180 /*
181 * Limit to -255-0 mV, 1 mV LSB
182 * Convert the value to a positive value for the register
183 *
184 * The value lives in the top 8 bits only, be careful
185 * and keep original value of other bits.
186 */
187 return (clamp_val(-val, 0, 255) << 8) | (old & 0xff);
188
189 case INA209_CRITICAL_DAC_POS:
190 /*
191 * Limit to 0-255 mV, 1 mV LSB
192 *
193 * The value lives in the top 8 bits only, be careful
194 * and keep original value of other bits.
195 */
196 return (clamp_val(val, 0, 255) << 8) | (old & 0xff);
197
198 case INA209_POWER_WARN:
199 case INA209_POWER_OVER_LIMIT:
200 /* 20 mW LSB */
201 return DIV_ROUND_CLOSEST(val, 20 * 1000);
202 }
203
204 /* Other registers are read-only, return access error */
205 return -EACCES;
206}
207
208static int ina209_interval_from_reg(u16 reg)
209{
210 return 68 >> (15 - ((reg >> 3) & 0x0f));
211}
212
213static u16 ina209_reg_from_interval(u16 config, long interval)
214{
215 int i, adc;
216
217 if (interval <= 0) {
218 adc = 8;
219 } else {
220 adc = 15;
221 for (i = 34 + 34 / 2; i; i >>= 1) {
222 if (i < interval)
223 break;
224 adc--;
225 }
226 }
227 return (config & 0xf807) | (adc << 3) | (adc << 7);
228}
229
230static ssize_t ina209_interval_store(struct device *dev,
231 struct device_attribute *da,
232 const char *buf, size_t count)
233{
234 struct ina209_data *data = ina209_update_device(dev);
235 long val;
236 u16 regval;
237 int ret;
238
239 if (IS_ERR(data))
240 return PTR_ERR(data);
241
242 ret = kstrtol(buf, 10, &val);
243 if (ret < 0)
244 return ret;
245
246 mutex_lock(&data->update_lock);
247 regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION],
248 val);
249 i2c_smbus_write_word_swapped(data->client, INA209_CONFIGURATION,
250 regval);
251 data->regs[INA209_CONFIGURATION] = regval;
252 data->update_interval = ina209_interval_from_reg(regval);
253 mutex_unlock(&data->update_lock);
254 return count;
255}
256
257static ssize_t ina209_interval_show(struct device *dev,
258 struct device_attribute *da, char *buf)
259{
260 struct ina209_data *data = dev_get_drvdata(dev);
261
262 return sysfs_emit(buf, "%d\n", data->update_interval);
263}
264
265/*
266 * History is reset by writing 1 into bit 0 of the respective peak register.
267 * Since more than one peak register may be affected by the scope of a
268 * reset_history attribute write, use a bit mask in attr->index to identify
269 * which registers are affected.
270 */
271static u16 ina209_reset_history_regs[] = {
272 INA209_SHUNT_VOLTAGE_POS_PEAK,
273 INA209_SHUNT_VOLTAGE_NEG_PEAK,
274 INA209_BUS_VOLTAGE_MAX_PEAK,
275 INA209_BUS_VOLTAGE_MIN_PEAK,
276 INA209_POWER_PEAK
277};
278
279static ssize_t ina209_history_store(struct device *dev,
280 struct device_attribute *da,
281 const char *buf, size_t count)
282{
283 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
284 struct ina209_data *data = dev_get_drvdata(dev);
285 struct i2c_client *client = data->client;
286 u32 mask = attr->index;
287 long val;
288 int i, ret;
289
290 ret = kstrtol(buf, 10, &val);
291 if (ret < 0)
292 return ret;
293
294 mutex_lock(&data->update_lock);
295 for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) {
296 if (mask & (1 << i))
297 i2c_smbus_write_word_swapped(client,
298 ina209_reset_history_regs[i], 1);
299 }
300 data->valid = false;
301 mutex_unlock(&data->update_lock);
302 return count;
303}
304
305static ssize_t ina209_value_store(struct device *dev,
306 struct device_attribute *da,
307 const char *buf, size_t count)
308{
309 struct ina209_data *data = ina209_update_device(dev);
310 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
311 int reg = attr->index;
312 long val;
313 int ret;
314
315 if (IS_ERR(data))
316 return PTR_ERR(data);
317
318 ret = kstrtol(buf, 10, &val);
319 if (ret < 0)
320 return ret;
321
322 mutex_lock(&data->update_lock);
323 ret = ina209_to_reg(reg, data->regs[reg], val);
324 if (ret < 0) {
325 count = ret;
326 goto abort;
327 }
328 i2c_smbus_write_word_swapped(data->client, reg, ret);
329 data->regs[reg] = ret;
330abort:
331 mutex_unlock(&data->update_lock);
332 return count;
333}
334
335static ssize_t ina209_value_show(struct device *dev,
336 struct device_attribute *da, char *buf)
337{
338 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
339 struct ina209_data *data = ina209_update_device(dev);
340 long val;
341
342 if (IS_ERR(data))
343 return PTR_ERR(data);
344
345 val = ina209_from_reg(attr->index, data->regs[attr->index]);
346 return sysfs_emit(buf, "%ld\n", val);
347}
348
349static ssize_t ina209_alarm_show(struct device *dev,
350 struct device_attribute *da, char *buf)
351{
352 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
353 struct ina209_data *data = ina209_update_device(dev);
354 const unsigned int mask = attr->index;
355 u16 status;
356
357 if (IS_ERR(data))
358 return PTR_ERR(data);
359
360 status = data->regs[INA209_STATUS];
361
362 /*
363 * All alarms are in the INA209_STATUS register. To avoid a long
364 * switch statement, the mask is passed in attr->index
365 */
366 return sysfs_emit(buf, "%u\n", !!(status & mask));
367}
368
369/* Shunt voltage, history, limits, alarms */
370static SENSOR_DEVICE_ATTR_RO(in0_input, ina209_value, INA209_SHUNT_VOLTAGE);
371static SENSOR_DEVICE_ATTR_RO(in0_input_highest, ina209_value,
372 INA209_SHUNT_VOLTAGE_POS_PEAK);
373static SENSOR_DEVICE_ATTR_RO(in0_input_lowest, ina209_value,
374 INA209_SHUNT_VOLTAGE_NEG_PEAK);
375static SENSOR_DEVICE_ATTR_WO(in0_reset_history, ina209_history,
376 (1 << 0) | (1 << 1));
377static SENSOR_DEVICE_ATTR_RW(in0_max, ina209_value,
378 INA209_SHUNT_VOLTAGE_POS_WARN);
379static SENSOR_DEVICE_ATTR_RW(in0_min, ina209_value,
380 INA209_SHUNT_VOLTAGE_NEG_WARN);
381static SENSOR_DEVICE_ATTR_RW(in0_crit_max, ina209_value,
382 INA209_CRITICAL_DAC_POS);
383static SENSOR_DEVICE_ATTR_RW(in0_crit_min, ina209_value,
384 INA209_CRITICAL_DAC_NEG);
385
386static SENSOR_DEVICE_ATTR_RO(in0_min_alarm, ina209_alarm, 1 << 11);
387static SENSOR_DEVICE_ATTR_RO(in0_max_alarm, ina209_alarm, 1 << 12);
388static SENSOR_DEVICE_ATTR_RO(in0_crit_min_alarm, ina209_alarm, 1 << 6);
389static SENSOR_DEVICE_ATTR_RO(in0_crit_max_alarm, ina209_alarm, 1 << 7);
390
391/* Bus voltage, history, limits, alarms */
392static SENSOR_DEVICE_ATTR_RO(in1_input, ina209_value, INA209_BUS_VOLTAGE);
393static SENSOR_DEVICE_ATTR_RO(in1_input_highest, ina209_value,
394 INA209_BUS_VOLTAGE_MAX_PEAK);
395static SENSOR_DEVICE_ATTR_RO(in1_input_lowest, ina209_value,
396 INA209_BUS_VOLTAGE_MIN_PEAK);
397static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ina209_history,
398 (1 << 2) | (1 << 3));
399static SENSOR_DEVICE_ATTR_RW(in1_max, ina209_value,
400 INA209_BUS_VOLTAGE_OVER_WARN);
401static SENSOR_DEVICE_ATTR_RW(in1_min, ina209_value,
402 INA209_BUS_VOLTAGE_UNDER_WARN);
403static SENSOR_DEVICE_ATTR_RW(in1_crit_max, ina209_value,
404 INA209_BUS_VOLTAGE_OVER_LIMIT);
405static SENSOR_DEVICE_ATTR_RW(in1_crit_min, ina209_value,
406 INA209_BUS_VOLTAGE_UNDER_LIMIT);
407
408static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ina209_alarm, 1 << 14);
409static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ina209_alarm, 1 << 15);
410static SENSOR_DEVICE_ATTR_RO(in1_crit_min_alarm, ina209_alarm, 1 << 9);
411static SENSOR_DEVICE_ATTR_RO(in1_crit_max_alarm, ina209_alarm, 1 << 10);
412
413/* Power */
414static SENSOR_DEVICE_ATTR_RO(power1_input, ina209_value, INA209_POWER);
415static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ina209_value,
416 INA209_POWER_PEAK);
417static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ina209_history, 1 << 4);
418static SENSOR_DEVICE_ATTR_RW(power1_max, ina209_value, INA209_POWER_WARN);
419static SENSOR_DEVICE_ATTR_RW(power1_crit, ina209_value,
420 INA209_POWER_OVER_LIMIT);
421
422static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ina209_alarm, 1 << 13);
423static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina209_alarm, 1 << 8);
424
425/* Current */
426static SENSOR_DEVICE_ATTR_RO(curr1_input, ina209_value, INA209_CURRENT);
427
428static SENSOR_DEVICE_ATTR_RW(update_interval, ina209_interval, 0);
429
430/*
431 * Finally, construct an array of pointers to members of the above objects,
432 * as required for sysfs_create_group()
433 */
434static struct attribute *ina209_attrs[] = {
435 &sensor_dev_attr_in0_input.dev_attr.attr,
436 &sensor_dev_attr_in0_input_highest.dev_attr.attr,
437 &sensor_dev_attr_in0_input_lowest.dev_attr.attr,
438 &sensor_dev_attr_in0_reset_history.dev_attr.attr,
439 &sensor_dev_attr_in0_max.dev_attr.attr,
440 &sensor_dev_attr_in0_min.dev_attr.attr,
441 &sensor_dev_attr_in0_crit_max.dev_attr.attr,
442 &sensor_dev_attr_in0_crit_min.dev_attr.attr,
443 &sensor_dev_attr_in0_max_alarm.dev_attr.attr,
444 &sensor_dev_attr_in0_min_alarm.dev_attr.attr,
445 &sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr,
446 &sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr,
447
448 &sensor_dev_attr_in1_input.dev_attr.attr,
449 &sensor_dev_attr_in1_input_highest.dev_attr.attr,
450 &sensor_dev_attr_in1_input_lowest.dev_attr.attr,
451 &sensor_dev_attr_in1_reset_history.dev_attr.attr,
452 &sensor_dev_attr_in1_max.dev_attr.attr,
453 &sensor_dev_attr_in1_min.dev_attr.attr,
454 &sensor_dev_attr_in1_crit_max.dev_attr.attr,
455 &sensor_dev_attr_in1_crit_min.dev_attr.attr,
456 &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
457 &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
458 &sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr,
459 &sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr,
460
461 &sensor_dev_attr_power1_input.dev_attr.attr,
462 &sensor_dev_attr_power1_input_highest.dev_attr.attr,
463 &sensor_dev_attr_power1_reset_history.dev_attr.attr,
464 &sensor_dev_attr_power1_max.dev_attr.attr,
465 &sensor_dev_attr_power1_crit.dev_attr.attr,
466 &sensor_dev_attr_power1_max_alarm.dev_attr.attr,
467 &sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
468
469 &sensor_dev_attr_curr1_input.dev_attr.attr,
470
471 &sensor_dev_attr_update_interval.dev_attr.attr,
472
473 NULL,
474};
475ATTRIBUTE_GROUPS(ina209);
476
477static void ina209_restore_conf(struct i2c_client *client,
478 struct ina209_data *data)
479{
480 /* Restore initial configuration */
481 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
482 data->config_orig);
483 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
484 data->calibration_orig);
485}
486
487static int ina209_init_client(struct i2c_client *client,
488 struct ina209_data *data)
489{
490 struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev);
491 u32 shunt;
492 int reg;
493
494 reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION);
495 if (reg < 0)
496 return reg;
497 data->calibration_orig = reg;
498
499 reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION);
500 if (reg < 0)
501 return reg;
502 data->config_orig = reg;
503
504 if (pdata) {
505 if (pdata->shunt_uohms <= 0)
506 return -EINVAL;
507 shunt = pdata->shunt_uohms;
508 } else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor",
509 &shunt)) {
510 if (shunt == 0)
511 return -EINVAL;
512 } else {
513 shunt = data->calibration_orig ?
514 40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT;
515 }
516
517 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
518 INA209_CONFIG_DEFAULT);
519 data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT);
520
521 /*
522 * Calibrate current LSB to 1mA. Shunt is in uOhms.
523 * See equation 13 in datasheet.
524 */
525 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
526 clamp_val(40960000 / shunt, 1, 65535));
527
528 /* Clear status register */
529 i2c_smbus_read_word_swapped(client, INA209_STATUS);
530
531 return 0;
532}
533
534static int ina209_probe(struct i2c_client *client)
535{
536 struct i2c_adapter *adapter = client->adapter;
537 struct ina209_data *data;
538 struct device *hwmon_dev;
539 int ret;
540
541 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
542 return -ENODEV;
543
544 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
545 if (!data)
546 return -ENOMEM;
547
548 i2c_set_clientdata(client, data);
549 data->client = client;
550 mutex_init(&data->update_lock);
551
552 ret = ina209_init_client(client, data);
553 if (ret)
554 return ret;
555
556 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
557 client->name,
558 data, ina209_groups);
559 if (IS_ERR(hwmon_dev)) {
560 ret = PTR_ERR(hwmon_dev);
561 goto out_restore_conf;
562 }
563
564 return 0;
565
566out_restore_conf:
567 ina209_restore_conf(client, data);
568 return ret;
569}
570
571static void ina209_remove(struct i2c_client *client)
572{
573 struct ina209_data *data = i2c_get_clientdata(client);
574
575 ina209_restore_conf(client, data);
576}
577
578static const struct i2c_device_id ina209_id[] = {
579 { "ina209", 0 },
580 { }
581};
582MODULE_DEVICE_TABLE(i2c, ina209_id);
583
584static const struct of_device_id __maybe_unused ina209_of_match[] = {
585 { .compatible = "ti,ina209" },
586 { },
587};
588MODULE_DEVICE_TABLE(of, ina209_of_match);
589
590/* This is the driver that will be inserted */
591static struct i2c_driver ina209_driver = {
592 .class = I2C_CLASS_HWMON,
593 .driver = {
594 .name = "ina209",
595 .of_match_table = of_match_ptr(ina209_of_match),
596 },
597 .probe = ina209_probe,
598 .remove = ina209_remove,
599 .id_table = ina209_id,
600};
601
602module_i2c_driver(ina209_driver);
603
604MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>");
605MODULE_DESCRIPTION("INA209 driver");
606MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Driver for the Texas Instruments / Burr Brown INA209
4 * Bidirectional Current/Power Monitor
5 *
6 * Copyright (C) 2012 Guenter Roeck <linux@roeck-us.net>
7 *
8 * Derived from Ira W. Snyder's original driver submission
9 * Copyright (C) 2008 Paul Hays <Paul.Hays@cattail.ca>
10 * Copyright (C) 2008-2009 Ira W. Snyder <iws@ovro.caltech.edu>
11 *
12 * Aligned with ina2xx driver
13 * Copyright (C) 2012 Lothar Felten <l-felten@ti.com>
14 * Thanks to Jan Volkering
15 *
16 * Datasheet:
17 * https://www.ti.com/lit/gpn/ina209
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/err.h>
24#include <linux/slab.h>
25#include <linux/bug.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29
30#include <linux/platform_data/ina2xx.h>
31
32/* register definitions */
33#define INA209_CONFIGURATION 0x00
34#define INA209_STATUS 0x01
35#define INA209_STATUS_MASK 0x02
36#define INA209_SHUNT_VOLTAGE 0x03
37#define INA209_BUS_VOLTAGE 0x04
38#define INA209_POWER 0x05
39#define INA209_CURRENT 0x06
40#define INA209_SHUNT_VOLTAGE_POS_PEAK 0x07
41#define INA209_SHUNT_VOLTAGE_NEG_PEAK 0x08
42#define INA209_BUS_VOLTAGE_MAX_PEAK 0x09
43#define INA209_BUS_VOLTAGE_MIN_PEAK 0x0a
44#define INA209_POWER_PEAK 0x0b
45#define INA209_SHUNT_VOLTAGE_POS_WARN 0x0c
46#define INA209_SHUNT_VOLTAGE_NEG_WARN 0x0d
47#define INA209_POWER_WARN 0x0e
48#define INA209_BUS_VOLTAGE_OVER_WARN 0x0f
49#define INA209_BUS_VOLTAGE_UNDER_WARN 0x10
50#define INA209_POWER_OVER_LIMIT 0x11
51#define INA209_BUS_VOLTAGE_OVER_LIMIT 0x12
52#define INA209_BUS_VOLTAGE_UNDER_LIMIT 0x13
53#define INA209_CRITICAL_DAC_POS 0x14
54#define INA209_CRITICAL_DAC_NEG 0x15
55#define INA209_CALIBRATION 0x16
56
57#define INA209_REGISTERS 0x17
58
59#define INA209_CONFIG_DEFAULT 0x3c47 /* PGA=8, full range */
60#define INA209_SHUNT_DEFAULT 10000 /* uOhm */
61
62struct ina209_data {
63 struct i2c_client *client;
64
65 struct mutex update_lock;
66 bool valid;
67 unsigned long last_updated; /* in jiffies */
68
69 u16 regs[INA209_REGISTERS]; /* All chip registers */
70
71 u16 config_orig; /* Original configuration */
72 u16 calibration_orig; /* Original calibration */
73 u16 update_interval;
74};
75
76static struct ina209_data *ina209_update_device(struct device *dev)
77{
78 struct ina209_data *data = dev_get_drvdata(dev);
79 struct i2c_client *client = data->client;
80 struct ina209_data *ret = data;
81 s32 val;
82 int i;
83
84 mutex_lock(&data->update_lock);
85
86 if (!data->valid ||
87 time_after(jiffies, data->last_updated + data->update_interval)) {
88 for (i = 0; i < ARRAY_SIZE(data->regs); i++) {
89 val = i2c_smbus_read_word_swapped(client, i);
90 if (val < 0) {
91 ret = ERR_PTR(val);
92 goto abort;
93 }
94 data->regs[i] = val;
95 }
96 data->last_updated = jiffies;
97 data->valid = true;
98 }
99abort:
100 mutex_unlock(&data->update_lock);
101 return ret;
102}
103
104/*
105 * Read a value from a device register and convert it to the
106 * appropriate sysfs units
107 */
108static long ina209_from_reg(const u8 reg, const u16 val)
109{
110 switch (reg) {
111 case INA209_SHUNT_VOLTAGE:
112 case INA209_SHUNT_VOLTAGE_POS_PEAK:
113 case INA209_SHUNT_VOLTAGE_NEG_PEAK:
114 case INA209_SHUNT_VOLTAGE_POS_WARN:
115 case INA209_SHUNT_VOLTAGE_NEG_WARN:
116 /* LSB=10 uV. Convert to mV. */
117 return DIV_ROUND_CLOSEST((s16)val, 100);
118
119 case INA209_BUS_VOLTAGE:
120 case INA209_BUS_VOLTAGE_MAX_PEAK:
121 case INA209_BUS_VOLTAGE_MIN_PEAK:
122 case INA209_BUS_VOLTAGE_OVER_WARN:
123 case INA209_BUS_VOLTAGE_UNDER_WARN:
124 case INA209_BUS_VOLTAGE_OVER_LIMIT:
125 case INA209_BUS_VOLTAGE_UNDER_LIMIT:
126 /* LSB=4 mV, last 3 bits unused */
127 return (val >> 3) * 4;
128
129 case INA209_CRITICAL_DAC_POS:
130 /* LSB=1 mV, in the upper 8 bits */
131 return val >> 8;
132
133 case INA209_CRITICAL_DAC_NEG:
134 /* LSB=1 mV, in the upper 8 bits */
135 return -1 * (val >> 8);
136
137 case INA209_POWER:
138 case INA209_POWER_PEAK:
139 case INA209_POWER_WARN:
140 case INA209_POWER_OVER_LIMIT:
141 /* LSB=20 mW. Convert to uW */
142 return val * 20 * 1000L;
143
144 case INA209_CURRENT:
145 /* LSB=1 mA (selected). Is in mA */
146 return (s16)val;
147 }
148
149 /* programmer goofed */
150 WARN_ON_ONCE(1);
151 return 0;
152}
153
154/*
155 * Take a value and convert it to register format, clamping the value
156 * to the appropriate range.
157 */
158static int ina209_to_reg(u8 reg, u16 old, long val)
159{
160 switch (reg) {
161 case INA209_SHUNT_VOLTAGE_POS_WARN:
162 case INA209_SHUNT_VOLTAGE_NEG_WARN:
163 /* Limit to +- 320 mV, 10 uV LSB */
164 return clamp_val(val, -320, 320) * 100;
165
166 case INA209_BUS_VOLTAGE_OVER_WARN:
167 case INA209_BUS_VOLTAGE_UNDER_WARN:
168 case INA209_BUS_VOLTAGE_OVER_LIMIT:
169 case INA209_BUS_VOLTAGE_UNDER_LIMIT:
170 /*
171 * Limit to 0-32000 mV, 4 mV LSB
172 *
173 * The last three bits aren't part of the value, but we'll
174 * preserve them in their original state.
175 */
176 return (DIV_ROUND_CLOSEST(clamp_val(val, 0, 32000), 4) << 3)
177 | (old & 0x7);
178
179 case INA209_CRITICAL_DAC_NEG:
180 /*
181 * Limit to -255-0 mV, 1 mV LSB
182 * Convert the value to a positive value for the register
183 *
184 * The value lives in the top 8 bits only, be careful
185 * and keep original value of other bits.
186 */
187 return (clamp_val(-val, 0, 255) << 8) | (old & 0xff);
188
189 case INA209_CRITICAL_DAC_POS:
190 /*
191 * Limit to 0-255 mV, 1 mV LSB
192 *
193 * The value lives in the top 8 bits only, be careful
194 * and keep original value of other bits.
195 */
196 return (clamp_val(val, 0, 255) << 8) | (old & 0xff);
197
198 case INA209_POWER_WARN:
199 case INA209_POWER_OVER_LIMIT:
200 /* 20 mW LSB */
201 return DIV_ROUND_CLOSEST(val, 20 * 1000);
202 }
203
204 /* Other registers are read-only, return access error */
205 return -EACCES;
206}
207
208static int ina209_interval_from_reg(u16 reg)
209{
210 return 68 >> (15 - ((reg >> 3) & 0x0f));
211}
212
213static u16 ina209_reg_from_interval(u16 config, long interval)
214{
215 int i, adc;
216
217 if (interval <= 0) {
218 adc = 8;
219 } else {
220 adc = 15;
221 for (i = 34 + 34 / 2; i; i >>= 1) {
222 if (i < interval)
223 break;
224 adc--;
225 }
226 }
227 return (config & 0xf807) | (adc << 3) | (adc << 7);
228}
229
230static ssize_t ina209_interval_store(struct device *dev,
231 struct device_attribute *da,
232 const char *buf, size_t count)
233{
234 struct ina209_data *data = ina209_update_device(dev);
235 long val;
236 u16 regval;
237 int ret;
238
239 if (IS_ERR(data))
240 return PTR_ERR(data);
241
242 ret = kstrtol(buf, 10, &val);
243 if (ret < 0)
244 return ret;
245
246 mutex_lock(&data->update_lock);
247 regval = ina209_reg_from_interval(data->regs[INA209_CONFIGURATION],
248 val);
249 i2c_smbus_write_word_swapped(data->client, INA209_CONFIGURATION,
250 regval);
251 data->regs[INA209_CONFIGURATION] = regval;
252 data->update_interval = ina209_interval_from_reg(regval);
253 mutex_unlock(&data->update_lock);
254 return count;
255}
256
257static ssize_t ina209_interval_show(struct device *dev,
258 struct device_attribute *da, char *buf)
259{
260 struct ina209_data *data = dev_get_drvdata(dev);
261
262 return snprintf(buf, PAGE_SIZE, "%d\n", data->update_interval);
263}
264
265/*
266 * History is reset by writing 1 into bit 0 of the respective peak register.
267 * Since more than one peak register may be affected by the scope of a
268 * reset_history attribute write, use a bit mask in attr->index to identify
269 * which registers are affected.
270 */
271static u16 ina209_reset_history_regs[] = {
272 INA209_SHUNT_VOLTAGE_POS_PEAK,
273 INA209_SHUNT_VOLTAGE_NEG_PEAK,
274 INA209_BUS_VOLTAGE_MAX_PEAK,
275 INA209_BUS_VOLTAGE_MIN_PEAK,
276 INA209_POWER_PEAK
277};
278
279static ssize_t ina209_history_store(struct device *dev,
280 struct device_attribute *da,
281 const char *buf, size_t count)
282{
283 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
284 struct ina209_data *data = dev_get_drvdata(dev);
285 struct i2c_client *client = data->client;
286 u32 mask = attr->index;
287 long val;
288 int i, ret;
289
290 ret = kstrtol(buf, 10, &val);
291 if (ret < 0)
292 return ret;
293
294 mutex_lock(&data->update_lock);
295 for (i = 0; i < ARRAY_SIZE(ina209_reset_history_regs); i++) {
296 if (mask & (1 << i))
297 i2c_smbus_write_word_swapped(client,
298 ina209_reset_history_regs[i], 1);
299 }
300 data->valid = false;
301 mutex_unlock(&data->update_lock);
302 return count;
303}
304
305static ssize_t ina209_value_store(struct device *dev,
306 struct device_attribute *da,
307 const char *buf, size_t count)
308{
309 struct ina209_data *data = ina209_update_device(dev);
310 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
311 int reg = attr->index;
312 long val;
313 int ret;
314
315 if (IS_ERR(data))
316 return PTR_ERR(data);
317
318 ret = kstrtol(buf, 10, &val);
319 if (ret < 0)
320 return ret;
321
322 mutex_lock(&data->update_lock);
323 ret = ina209_to_reg(reg, data->regs[reg], val);
324 if (ret < 0) {
325 count = ret;
326 goto abort;
327 }
328 i2c_smbus_write_word_swapped(data->client, reg, ret);
329 data->regs[reg] = ret;
330abort:
331 mutex_unlock(&data->update_lock);
332 return count;
333}
334
335static ssize_t ina209_value_show(struct device *dev,
336 struct device_attribute *da, char *buf)
337{
338 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
339 struct ina209_data *data = ina209_update_device(dev);
340 long val;
341
342 if (IS_ERR(data))
343 return PTR_ERR(data);
344
345 val = ina209_from_reg(attr->index, data->regs[attr->index]);
346 return snprintf(buf, PAGE_SIZE, "%ld\n", val);
347}
348
349static ssize_t ina209_alarm_show(struct device *dev,
350 struct device_attribute *da, char *buf)
351{
352 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
353 struct ina209_data *data = ina209_update_device(dev);
354 const unsigned int mask = attr->index;
355 u16 status;
356
357 if (IS_ERR(data))
358 return PTR_ERR(data);
359
360 status = data->regs[INA209_STATUS];
361
362 /*
363 * All alarms are in the INA209_STATUS register. To avoid a long
364 * switch statement, the mask is passed in attr->index
365 */
366 return snprintf(buf, PAGE_SIZE, "%u\n", !!(status & mask));
367}
368
369/* Shunt voltage, history, limits, alarms */
370static SENSOR_DEVICE_ATTR_RO(in0_input, ina209_value, INA209_SHUNT_VOLTAGE);
371static SENSOR_DEVICE_ATTR_RO(in0_input_highest, ina209_value,
372 INA209_SHUNT_VOLTAGE_POS_PEAK);
373static SENSOR_DEVICE_ATTR_RO(in0_input_lowest, ina209_value,
374 INA209_SHUNT_VOLTAGE_NEG_PEAK);
375static SENSOR_DEVICE_ATTR_WO(in0_reset_history, ina209_history,
376 (1 << 0) | (1 << 1));
377static SENSOR_DEVICE_ATTR_RW(in0_max, ina209_value,
378 INA209_SHUNT_VOLTAGE_POS_WARN);
379static SENSOR_DEVICE_ATTR_RW(in0_min, ina209_value,
380 INA209_SHUNT_VOLTAGE_NEG_WARN);
381static SENSOR_DEVICE_ATTR_RW(in0_crit_max, ina209_value,
382 INA209_CRITICAL_DAC_POS);
383static SENSOR_DEVICE_ATTR_RW(in0_crit_min, ina209_value,
384 INA209_CRITICAL_DAC_NEG);
385
386static SENSOR_DEVICE_ATTR_RO(in0_min_alarm, ina209_alarm, 1 << 11);
387static SENSOR_DEVICE_ATTR_RO(in0_max_alarm, ina209_alarm, 1 << 12);
388static SENSOR_DEVICE_ATTR_RO(in0_crit_min_alarm, ina209_alarm, 1 << 6);
389static SENSOR_DEVICE_ATTR_RO(in0_crit_max_alarm, ina209_alarm, 1 << 7);
390
391/* Bus voltage, history, limits, alarms */
392static SENSOR_DEVICE_ATTR_RO(in1_input, ina209_value, INA209_BUS_VOLTAGE);
393static SENSOR_DEVICE_ATTR_RO(in1_input_highest, ina209_value,
394 INA209_BUS_VOLTAGE_MAX_PEAK);
395static SENSOR_DEVICE_ATTR_RO(in1_input_lowest, ina209_value,
396 INA209_BUS_VOLTAGE_MIN_PEAK);
397static SENSOR_DEVICE_ATTR_WO(in1_reset_history, ina209_history,
398 (1 << 2) | (1 << 3));
399static SENSOR_DEVICE_ATTR_RW(in1_max, ina209_value,
400 INA209_BUS_VOLTAGE_OVER_WARN);
401static SENSOR_DEVICE_ATTR_RW(in1_min, ina209_value,
402 INA209_BUS_VOLTAGE_UNDER_WARN);
403static SENSOR_DEVICE_ATTR_RW(in1_crit_max, ina209_value,
404 INA209_BUS_VOLTAGE_OVER_LIMIT);
405static SENSOR_DEVICE_ATTR_RW(in1_crit_min, ina209_value,
406 INA209_BUS_VOLTAGE_UNDER_LIMIT);
407
408static SENSOR_DEVICE_ATTR_RO(in1_min_alarm, ina209_alarm, 1 << 14);
409static SENSOR_DEVICE_ATTR_RO(in1_max_alarm, ina209_alarm, 1 << 15);
410static SENSOR_DEVICE_ATTR_RO(in1_crit_min_alarm, ina209_alarm, 1 << 9);
411static SENSOR_DEVICE_ATTR_RO(in1_crit_max_alarm, ina209_alarm, 1 << 10);
412
413/* Power */
414static SENSOR_DEVICE_ATTR_RO(power1_input, ina209_value, INA209_POWER);
415static SENSOR_DEVICE_ATTR_RO(power1_input_highest, ina209_value,
416 INA209_POWER_PEAK);
417static SENSOR_DEVICE_ATTR_WO(power1_reset_history, ina209_history, 1 << 4);
418static SENSOR_DEVICE_ATTR_RW(power1_max, ina209_value, INA209_POWER_WARN);
419static SENSOR_DEVICE_ATTR_RW(power1_crit, ina209_value,
420 INA209_POWER_OVER_LIMIT);
421
422static SENSOR_DEVICE_ATTR_RO(power1_max_alarm, ina209_alarm, 1 << 13);
423static SENSOR_DEVICE_ATTR_RO(power1_crit_alarm, ina209_alarm, 1 << 8);
424
425/* Current */
426static SENSOR_DEVICE_ATTR_RO(curr1_input, ina209_value, INA209_CURRENT);
427
428static SENSOR_DEVICE_ATTR_RW(update_interval, ina209_interval, 0);
429
430/*
431 * Finally, construct an array of pointers to members of the above objects,
432 * as required for sysfs_create_group()
433 */
434static struct attribute *ina209_attrs[] = {
435 &sensor_dev_attr_in0_input.dev_attr.attr,
436 &sensor_dev_attr_in0_input_highest.dev_attr.attr,
437 &sensor_dev_attr_in0_input_lowest.dev_attr.attr,
438 &sensor_dev_attr_in0_reset_history.dev_attr.attr,
439 &sensor_dev_attr_in0_max.dev_attr.attr,
440 &sensor_dev_attr_in0_min.dev_attr.attr,
441 &sensor_dev_attr_in0_crit_max.dev_attr.attr,
442 &sensor_dev_attr_in0_crit_min.dev_attr.attr,
443 &sensor_dev_attr_in0_max_alarm.dev_attr.attr,
444 &sensor_dev_attr_in0_min_alarm.dev_attr.attr,
445 &sensor_dev_attr_in0_crit_max_alarm.dev_attr.attr,
446 &sensor_dev_attr_in0_crit_min_alarm.dev_attr.attr,
447
448 &sensor_dev_attr_in1_input.dev_attr.attr,
449 &sensor_dev_attr_in1_input_highest.dev_attr.attr,
450 &sensor_dev_attr_in1_input_lowest.dev_attr.attr,
451 &sensor_dev_attr_in1_reset_history.dev_attr.attr,
452 &sensor_dev_attr_in1_max.dev_attr.attr,
453 &sensor_dev_attr_in1_min.dev_attr.attr,
454 &sensor_dev_attr_in1_crit_max.dev_attr.attr,
455 &sensor_dev_attr_in1_crit_min.dev_attr.attr,
456 &sensor_dev_attr_in1_max_alarm.dev_attr.attr,
457 &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
458 &sensor_dev_attr_in1_crit_max_alarm.dev_attr.attr,
459 &sensor_dev_attr_in1_crit_min_alarm.dev_attr.attr,
460
461 &sensor_dev_attr_power1_input.dev_attr.attr,
462 &sensor_dev_attr_power1_input_highest.dev_attr.attr,
463 &sensor_dev_attr_power1_reset_history.dev_attr.attr,
464 &sensor_dev_attr_power1_max.dev_attr.attr,
465 &sensor_dev_attr_power1_crit.dev_attr.attr,
466 &sensor_dev_attr_power1_max_alarm.dev_attr.attr,
467 &sensor_dev_attr_power1_crit_alarm.dev_attr.attr,
468
469 &sensor_dev_attr_curr1_input.dev_attr.attr,
470
471 &sensor_dev_attr_update_interval.dev_attr.attr,
472
473 NULL,
474};
475ATTRIBUTE_GROUPS(ina209);
476
477static void ina209_restore_conf(struct i2c_client *client,
478 struct ina209_data *data)
479{
480 /* Restore initial configuration */
481 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
482 data->config_orig);
483 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
484 data->calibration_orig);
485}
486
487static int ina209_init_client(struct i2c_client *client,
488 struct ina209_data *data)
489{
490 struct ina2xx_platform_data *pdata = dev_get_platdata(&client->dev);
491 u32 shunt;
492 int reg;
493
494 reg = i2c_smbus_read_word_swapped(client, INA209_CALIBRATION);
495 if (reg < 0)
496 return reg;
497 data->calibration_orig = reg;
498
499 reg = i2c_smbus_read_word_swapped(client, INA209_CONFIGURATION);
500 if (reg < 0)
501 return reg;
502 data->config_orig = reg;
503
504 if (pdata) {
505 if (pdata->shunt_uohms <= 0)
506 return -EINVAL;
507 shunt = pdata->shunt_uohms;
508 } else if (!of_property_read_u32(client->dev.of_node, "shunt-resistor",
509 &shunt)) {
510 if (shunt == 0)
511 return -EINVAL;
512 } else {
513 shunt = data->calibration_orig ?
514 40960000 / data->calibration_orig : INA209_SHUNT_DEFAULT;
515 }
516
517 i2c_smbus_write_word_swapped(client, INA209_CONFIGURATION,
518 INA209_CONFIG_DEFAULT);
519 data->update_interval = ina209_interval_from_reg(INA209_CONFIG_DEFAULT);
520
521 /*
522 * Calibrate current LSB to 1mA. Shunt is in uOhms.
523 * See equation 13 in datasheet.
524 */
525 i2c_smbus_write_word_swapped(client, INA209_CALIBRATION,
526 clamp_val(40960000 / shunt, 1, 65535));
527
528 /* Clear status register */
529 i2c_smbus_read_word_swapped(client, INA209_STATUS);
530
531 return 0;
532}
533
534static int ina209_probe(struct i2c_client *client,
535 const struct i2c_device_id *id)
536{
537 struct i2c_adapter *adapter = client->adapter;
538 struct ina209_data *data;
539 struct device *hwmon_dev;
540 int ret;
541
542 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
543 return -ENODEV;
544
545 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
546 if (!data)
547 return -ENOMEM;
548
549 i2c_set_clientdata(client, data);
550 data->client = client;
551 mutex_init(&data->update_lock);
552
553 ret = ina209_init_client(client, data);
554 if (ret)
555 return ret;
556
557 hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
558 client->name,
559 data, ina209_groups);
560 if (IS_ERR(hwmon_dev)) {
561 ret = PTR_ERR(hwmon_dev);
562 goto out_restore_conf;
563 }
564
565 return 0;
566
567out_restore_conf:
568 ina209_restore_conf(client, data);
569 return ret;
570}
571
572static int ina209_remove(struct i2c_client *client)
573{
574 struct ina209_data *data = i2c_get_clientdata(client);
575
576 ina209_restore_conf(client, data);
577
578 return 0;
579}
580
581static const struct i2c_device_id ina209_id[] = {
582 { "ina209", 0 },
583 { }
584};
585MODULE_DEVICE_TABLE(i2c, ina209_id);
586
587static const struct of_device_id __maybe_unused ina209_of_match[] = {
588 { .compatible = "ti,ina209" },
589 { },
590};
591MODULE_DEVICE_TABLE(of, ina209_of_match);
592
593/* This is the driver that will be inserted */
594static struct i2c_driver ina209_driver = {
595 .class = I2C_CLASS_HWMON,
596 .driver = {
597 .name = "ina209",
598 .of_match_table = of_match_ptr(ina209_of_match),
599 },
600 .probe = ina209_probe,
601 .remove = ina209_remove,
602 .id_table = ina209_id,
603};
604
605module_i2c_driver(ina209_driver);
606
607MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>, Paul Hays <Paul.Hays@cattail.ca>, Guenter Roeck <linux@roeck-us.net>");
608MODULE_DESCRIPTION("INA209 driver");
609MODULE_LICENSE("GPL");