1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
4 *
5 * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
6 * Copyright (c) 2015 Essensium NV
7 * Copyright (c) 2015 Melexis
8 *
9 * Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor
10 *
11 * (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
12 *
13 * To wake up from sleep mode, the SDA line must be held low while SCL is high
14 * for at least 33ms. This is achieved with an extra GPIO that can be connected
15 * directly to the SDA line. In normal operation, the GPIO is set as input and
16 * will not interfere in I2C communication. While the GPIO is driven low, the
17 * i2c adapter is locked since it cannot be used by other clients. The SCL line
18 * always has a pull-up so we do not need an extra GPIO to drive it high. If
19 * the "wakeup" GPIO is not given, power management will be disabled.
20 */
21
22 #include <linux/err.h>
23 #include <linux/i2c.h>
24 #include <linux/module.h>
25 #include <linux/delay.h>
26 #include <linux/jiffies.h>
27 #include <linux/gpio/consumer.h>
28 #include <linux/pm_runtime.h>
29
30 #include <linux/iio/iio.h>
31 #include <linux/iio/sysfs.h>
32
33 #define MLX90614_OP_RAM 0x00
34 #define MLX90614_OP_EEPROM 0x20
35 #define MLX90614_OP_SLEEP 0xff
36
37 /* RAM offsets with 16-bit data, MSB first */
38 #define MLX90614_RAW1 (MLX90614_OP_RAM | 0x04) /* raw data IR channel 1 */
39 #define MLX90614_RAW2 (MLX90614_OP_RAM | 0x05) /* raw data IR channel 2 */
40 #define MLX90614_TA (MLX90614_OP_RAM | 0x06) /* ambient temperature */
41 #define MLX90614_TOBJ1 (MLX90614_OP_RAM | 0x07) /* object 1 temperature */
42 #define MLX90614_TOBJ2 (MLX90614_OP_RAM | 0x08) /* object 2 temperature */
43
44 /* EEPROM offsets with 16-bit data, MSB first */
45 #define MLX90614_EMISSIVITY (MLX90614_OP_EEPROM | 0x04) /* emissivity correction coefficient */
46 #define MLX90614_CONFIG (MLX90614_OP_EEPROM | 0x05) /* configuration register */
47
48 /* Control bits in configuration register */
49 #define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
50 #define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
51 #define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */
52 #define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
53 #define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
54 #define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
55 #define MLX90614_CONFIG_GAIN_SHIFT 11 /* gain */
56 #define MLX90614_CONFIG_GAIN_MASK (0x7 << MLX90614_CONFIG_GAIN_SHIFT)
57
58 /* Timings (in ms) */
59 #define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
60 #define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
61 #define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
62
63 #define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */
64
65 /* Magic constants */
66 #define MLX90614_CONST_OFFSET_DEC -13657 /* decimal part of the Kelvin offset */
67 #define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */
68 #define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */
69 #define MLX90614_CONST_RAW_EMISSIVITY_MAX 65535 /* max value for emissivity */
70 #define MLX90614_CONST_EMISSIVITY_RESOLUTION 15259 /* 1/65535 ~ 0.000015259 */
71 #define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */
72
73 struct mlx90614_data {
74 struct i2c_client *client;
75 struct mutex lock; /* for EEPROM access only */
76 struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */
77 unsigned long ready_timestamp; /* in jiffies */
78 };
79
80 /* Bandwidth values for IIR filtering */
81 static const int mlx90614_iir_values[] = {77, 31, 20, 15, 723, 153, 110, 86};
82 static const int mlx90614_freqs[][2] = {
83 {0, 150000},
84 {0, 200000},
85 {0, 310000},
86 {0, 770000},
87 {0, 860000},
88 {1, 100000},
89 {1, 530000},
90 {7, 230000}
91 };
92
93 /*
94 * Erase an address and write word.
95 * The mutex must be locked before calling.
96 */
mlx90614_write_word(const struct i2c_client * client,u8 command,u16 value)97 static s32 mlx90614_write_word(const struct i2c_client *client, u8 command,
98 u16 value)
99 {
100 /*
101 * Note: The mlx90614 requires a PEC on writing but does not send us a
102 * valid PEC on reading. Hence, we cannot set I2C_CLIENT_PEC in
103 * i2c_client.flags. As a workaround, we use i2c_smbus_xfer here.
104 */
105 union i2c_smbus_data data;
106 s32 ret;
107
108 dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command);
109
110 data.word = 0x0000; /* erase command */
111 ret = i2c_smbus_xfer(client->adapter, client->addr,
112 client->flags | I2C_CLIENT_PEC,
113 I2C_SMBUS_WRITE, command,
114 I2C_SMBUS_WORD_DATA, &data);
115 if (ret < 0)
116 return ret;
117
118 msleep(MLX90614_TIMING_EEPROM);
119
120 data.word = value; /* actual write */
121 ret = i2c_smbus_xfer(client->adapter, client->addr,
122 client->flags | I2C_CLIENT_PEC,
123 I2C_SMBUS_WRITE, command,
124 I2C_SMBUS_WORD_DATA, &data);
125
126 msleep(MLX90614_TIMING_EEPROM);
127
128 return ret;
129 }
130
131 /*
132 * Find the IIR value inside mlx90614_iir_values array and return its position
133 * which is equivalent to the bit value in sensor register
134 */
mlx90614_iir_search(const struct i2c_client * client,int value)135 static inline s32 mlx90614_iir_search(const struct i2c_client *client,
136 int value)
137 {
138 int i;
139 s32 ret;
140
141 for (i = 0; i < ARRAY_SIZE(mlx90614_iir_values); ++i) {
142 if (value == mlx90614_iir_values[i])
143 break;
144 }
145
146 if (i == ARRAY_SIZE(mlx90614_iir_values))
147 return -EINVAL;
148
149 /*
150 * CONFIG register values must not be changed so
151 * we must read them before we actually write
152 * changes
153 */
154 ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
155 if (ret < 0)
156 return ret;
157
158 ret &= ~MLX90614_CONFIG_FIR_MASK;
159 ret |= MLX90614_CONST_FIR << MLX90614_CONFIG_FIR_SHIFT;
160 ret &= ~MLX90614_CONFIG_IIR_MASK;
161 ret |= i << MLX90614_CONFIG_IIR_SHIFT;
162
163 /* Write changed values */
164 ret = mlx90614_write_word(client, MLX90614_CONFIG, ret);
165 return ret;
166 }
167
168 #ifdef CONFIG_PM
169 /*
170 * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since
171 * the last wake-up. This is normally only needed to get a valid temperature
172 * reading. EEPROM access does not need such delay.
173 * Return 0 on success, <0 on error.
174 */
mlx90614_power_get(struct mlx90614_data * data,bool startup)175 static int mlx90614_power_get(struct mlx90614_data *data, bool startup)
176 {
177 unsigned long now;
178 int ret;
179
180 if (!data->wakeup_gpio)
181 return 0;
182
183 ret = pm_runtime_resume_and_get(&data->client->dev);
184 if (ret < 0)
185 return ret;
186
187 if (startup) {
188 now = jiffies;
189 if (time_before(now, data->ready_timestamp) &&
190 msleep_interruptible(jiffies_to_msecs(
191 data->ready_timestamp - now)) != 0) {
192 pm_runtime_put_autosuspend(&data->client->dev);
193 return -EINTR;
194 }
195 }
196
197 return 0;
198 }
199
mlx90614_power_put(struct mlx90614_data * data)200 static void mlx90614_power_put(struct mlx90614_data *data)
201 {
202 if (!data->wakeup_gpio)
203 return;
204
205 pm_runtime_mark_last_busy(&data->client->dev);
206 pm_runtime_put_autosuspend(&data->client->dev);
207 }
208 #else
mlx90614_power_get(struct mlx90614_data * data,bool startup)209 static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup)
210 {
211 return 0;
212 }
213
mlx90614_power_put(struct mlx90614_data * data)214 static inline void mlx90614_power_put(struct mlx90614_data *data)
215 {
216 }
217 #endif
218
mlx90614_read_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * channel,int * val,int * val2,long mask)219 static int mlx90614_read_raw(struct iio_dev *indio_dev,
220 struct iio_chan_spec const *channel, int *val,
221 int *val2, long mask)
222 {
223 struct mlx90614_data *data = iio_priv(indio_dev);
224 u8 cmd;
225 s32 ret;
226
227 switch (mask) {
228 case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
229 switch (channel->channel2) {
230 case IIO_MOD_TEMP_AMBIENT:
231 cmd = MLX90614_TA;
232 break;
233 case IIO_MOD_TEMP_OBJECT:
234 switch (channel->channel) {
235 case 0:
236 cmd = MLX90614_TOBJ1;
237 break;
238 case 1:
239 cmd = MLX90614_TOBJ2;
240 break;
241 default:
242 return -EINVAL;
243 }
244 break;
245 default:
246 return -EINVAL;
247 }
248
249 ret = mlx90614_power_get(data, true);
250 if (ret < 0)
251 return ret;
252 ret = i2c_smbus_read_word_data(data->client, cmd);
253 mlx90614_power_put(data);
254
255 if (ret < 0)
256 return ret;
257
258 /* MSB is an error flag */
259 if (ret & 0x8000)
260 return -EIO;
261
262 *val = ret;
263 return IIO_VAL_INT;
264 case IIO_CHAN_INFO_OFFSET:
265 *val = MLX90614_CONST_OFFSET_DEC;
266 *val2 = MLX90614_CONST_OFFSET_REM;
267 return IIO_VAL_INT_PLUS_MICRO;
268 case IIO_CHAN_INFO_SCALE:
269 *val = MLX90614_CONST_SCALE;
270 return IIO_VAL_INT;
271 case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
272 ret = mlx90614_power_get(data, false);
273 if (ret < 0)
274 return ret;
275
276 mutex_lock(&data->lock);
277 ret = i2c_smbus_read_word_data(data->client,
278 MLX90614_EMISSIVITY);
279 mutex_unlock(&data->lock);
280 mlx90614_power_put(data);
281
282 if (ret < 0)
283 return ret;
284
285 if (ret == MLX90614_CONST_RAW_EMISSIVITY_MAX) {
286 *val = 1;
287 *val2 = 0;
288 } else {
289 *val = 0;
290 *val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION;
291 }
292 return IIO_VAL_INT_PLUS_NANO;
293 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with
294 FIR = 1024 */
295 ret = mlx90614_power_get(data, false);
296 if (ret < 0)
297 return ret;
298
299 mutex_lock(&data->lock);
300 ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
301 mutex_unlock(&data->lock);
302 mlx90614_power_put(data);
303
304 if (ret < 0)
305 return ret;
306
307 *val = mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] / 100;
308 *val2 = (mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] % 100) *
309 10000;
310 return IIO_VAL_INT_PLUS_MICRO;
311 default:
312 return -EINVAL;
313 }
314 }
315
mlx90614_write_raw(struct iio_dev * indio_dev,struct iio_chan_spec const * channel,int val,int val2,long mask)316 static int mlx90614_write_raw(struct iio_dev *indio_dev,
317 struct iio_chan_spec const *channel, int val,
318 int val2, long mask)
319 {
320 struct mlx90614_data *data = iio_priv(indio_dev);
321 s32 ret;
322
323 switch (mask) {
324 case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */
325 if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
326 return -EINVAL;
327 val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX +
328 val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION;
329
330 ret = mlx90614_power_get(data, false);
331 if (ret < 0)
332 return ret;
333
334 mutex_lock(&data->lock);
335 ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY,
336 val);
337 mutex_unlock(&data->lock);
338 mlx90614_power_put(data);
339
340 return ret;
341 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */
342 if (val < 0 || val2 < 0)
343 return -EINVAL;
344
345 ret = mlx90614_power_get(data, false);
346 if (ret < 0)
347 return ret;
348
349 mutex_lock(&data->lock);
350 ret = mlx90614_iir_search(data->client,
351 val * 100 + val2 / 10000);
352 mutex_unlock(&data->lock);
353 mlx90614_power_put(data);
354
355 return ret;
356 default:
357 return -EINVAL;
358 }
359 }
360
mlx90614_write_raw_get_fmt(struct iio_dev * indio_dev,struct iio_chan_spec const * channel,long mask)361 static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev,
362 struct iio_chan_spec const *channel,
363 long mask)
364 {
365 switch (mask) {
366 case IIO_CHAN_INFO_CALIBEMISSIVITY:
367 return IIO_VAL_INT_PLUS_NANO;
368 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
369 return IIO_VAL_INT_PLUS_MICRO;
370 default:
371 return -EINVAL;
372 }
373 }
374
mlx90614_read_avail(struct iio_dev * indio_dev,struct iio_chan_spec const * chan,const int ** vals,int * type,int * length,long mask)375 static int mlx90614_read_avail(struct iio_dev *indio_dev,
376 struct iio_chan_spec const *chan,
377 const int **vals, int *type, int *length,
378 long mask)
379 {
380 switch (mask) {
381 case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
382 *vals = (int *)mlx90614_freqs;
383 *type = IIO_VAL_INT_PLUS_MICRO;
384 *length = 2 * ARRAY_SIZE(mlx90614_freqs);
385 return IIO_AVAIL_LIST;
386 default:
387 return -EINVAL;
388 }
389 }
390
391 static const struct iio_chan_spec mlx90614_channels[] = {
392 {
393 .type = IIO_TEMP,
394 .modified = 1,
395 .channel2 = IIO_MOD_TEMP_AMBIENT,
396 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
397 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
398 BIT(IIO_CHAN_INFO_SCALE),
399 },
400 {
401 .type = IIO_TEMP,
402 .modified = 1,
403 .channel2 = IIO_MOD_TEMP_OBJECT,
404 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
405 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
406 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
407 .info_mask_separate_available =
408 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
409 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
410 BIT(IIO_CHAN_INFO_SCALE),
411 },
412 {
413 .type = IIO_TEMP,
414 .indexed = 1,
415 .modified = 1,
416 .channel = 1,
417 .channel2 = IIO_MOD_TEMP_OBJECT,
418 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
419 BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
420 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
421 .info_mask_separate_available =
422 BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
423 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
424 BIT(IIO_CHAN_INFO_SCALE),
425 },
426 };
427
428 static const struct iio_info mlx90614_info = {
429 .read_raw = mlx90614_read_raw,
430 .write_raw = mlx90614_write_raw,
431 .write_raw_get_fmt = mlx90614_write_raw_get_fmt,
432 .read_avail = mlx90614_read_avail,
433 };
434
435 #ifdef CONFIG_PM
mlx90614_sleep(struct mlx90614_data * data)436 static int mlx90614_sleep(struct mlx90614_data *data)
437 {
438 s32 ret;
439
440 if (!data->wakeup_gpio) {
441 dev_dbg(&data->client->dev, "Sleep disabled");
442 return -ENOSYS;
443 }
444
445 dev_dbg(&data->client->dev, "Requesting sleep");
446
447 mutex_lock(&data->lock);
448 ret = i2c_smbus_xfer(data->client->adapter, data->client->addr,
449 data->client->flags | I2C_CLIENT_PEC,
450 I2C_SMBUS_WRITE, MLX90614_OP_SLEEP,
451 I2C_SMBUS_BYTE, NULL);
452 mutex_unlock(&data->lock);
453
454 return ret;
455 }
456
mlx90614_wakeup(struct mlx90614_data * data)457 static int mlx90614_wakeup(struct mlx90614_data *data)
458 {
459 if (!data->wakeup_gpio) {
460 dev_dbg(&data->client->dev, "Wake-up disabled");
461 return -ENOSYS;
462 }
463
464 dev_dbg(&data->client->dev, "Requesting wake-up");
465
466 i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
467 gpiod_direction_output(data->wakeup_gpio, 0);
468 msleep(MLX90614_TIMING_WAKEUP);
469 gpiod_direction_input(data->wakeup_gpio);
470 i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
471
472 data->ready_timestamp = jiffies +
473 msecs_to_jiffies(MLX90614_TIMING_STARTUP);
474
475 /*
476 * Quirk: the i2c controller may get confused right after the
477 * wake-up signal has been sent. As a workaround, do a dummy read.
478 * If the read fails, the controller will probably be reset so that
479 * further reads will work.
480 */
481 i2c_smbus_read_word_data(data->client, MLX90614_CONFIG);
482
483 return 0;
484 }
485
486 /* Return wake-up GPIO or NULL if sleep functionality should be disabled. */
mlx90614_probe_wakeup(struct i2c_client * client)487 static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
488 {
489 struct gpio_desc *gpio;
490
491 if (!i2c_check_functionality(client->adapter,
492 I2C_FUNC_SMBUS_WRITE_BYTE)) {
493 dev_info(&client->dev,
494 "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled");
495 return NULL;
496 }
497
498 gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN);
499
500 if (IS_ERR(gpio)) {
501 dev_warn(&client->dev,
502 "gpio acquisition failed with error %ld, sleep disabled",
503 PTR_ERR(gpio));
504 return NULL;
505 } else if (!gpio) {
506 dev_info(&client->dev,
507 "wakeup-gpio not found, sleep disabled");
508 }
509
510 return gpio;
511 }
512 #else
mlx90614_sleep(struct mlx90614_data * data)513 static inline int mlx90614_sleep(struct mlx90614_data *data)
514 {
515 return -ENOSYS;
516 }
mlx90614_wakeup(struct mlx90614_data * data)517 static inline int mlx90614_wakeup(struct mlx90614_data *data)
518 {
519 return -ENOSYS;
520 }
mlx90614_probe_wakeup(struct i2c_client * client)521 static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
522 {
523 return NULL;
524 }
525 #endif
526
527 /* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
mlx90614_probe_num_ir_sensors(struct i2c_client * client)528 static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
529 {
530 s32 ret;
531
532 ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG);
533
534 if (ret < 0)
535 return ret;
536
537 return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
538 }
539
mlx90614_probe(struct i2c_client * client,const struct i2c_device_id * id)540 static int mlx90614_probe(struct i2c_client *client,
541 const struct i2c_device_id *id)
542 {
543 struct iio_dev *indio_dev;
544 struct mlx90614_data *data;
545 int ret;
546
547 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
548 return -EOPNOTSUPP;
549
550 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
551 if (!indio_dev)
552 return -ENOMEM;
553
554 data = iio_priv(indio_dev);
555 i2c_set_clientdata(client, indio_dev);
556 data->client = client;
557 mutex_init(&data->lock);
558 data->wakeup_gpio = mlx90614_probe_wakeup(client);
559
560 mlx90614_wakeup(data);
561
562 indio_dev->name = id->name;
563 indio_dev->modes = INDIO_DIRECT_MODE;
564 indio_dev->info = &mlx90614_info;
565
566 ret = mlx90614_probe_num_ir_sensors(client);
567 switch (ret) {
568 case 0:
569 dev_dbg(&client->dev, "Found single sensor");
570 indio_dev->channels = mlx90614_channels;
571 indio_dev->num_channels = 2;
572 break;
573 case 1:
574 dev_dbg(&client->dev, "Found dual sensor");
575 indio_dev->channels = mlx90614_channels;
576 indio_dev->num_channels = 3;
577 break;
578 default:
579 return ret;
580 }
581
582 if (data->wakeup_gpio) {
583 pm_runtime_set_autosuspend_delay(&client->dev,
584 MLX90614_AUTOSLEEP_DELAY);
585 pm_runtime_use_autosuspend(&client->dev);
586 pm_runtime_set_active(&client->dev);
587 pm_runtime_enable(&client->dev);
588 }
589
590 return iio_device_register(indio_dev);
591 }
592
mlx90614_remove(struct i2c_client * client)593 static void mlx90614_remove(struct i2c_client *client)
594 {
595 struct iio_dev *indio_dev = i2c_get_clientdata(client);
596 struct mlx90614_data *data = iio_priv(indio_dev);
597
598 iio_device_unregister(indio_dev);
599
600 if (data->wakeup_gpio) {
601 pm_runtime_disable(&client->dev);
602 if (!pm_runtime_status_suspended(&client->dev))
603 mlx90614_sleep(data);
604 pm_runtime_set_suspended(&client->dev);
605 }
606 }
607
608 static const struct i2c_device_id mlx90614_id[] = {
609 { "mlx90614", 0 },
610 { }
611 };
612 MODULE_DEVICE_TABLE(i2c, mlx90614_id);
613
614 static const struct of_device_id mlx90614_of_match[] = {
615 { .compatible = "melexis,mlx90614" },
616 { }
617 };
618 MODULE_DEVICE_TABLE(of, mlx90614_of_match);
619
mlx90614_pm_suspend(struct device * dev)620 static int mlx90614_pm_suspend(struct device *dev)
621 {
622 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
623 struct mlx90614_data *data = iio_priv(indio_dev);
624
625 if (data->wakeup_gpio && pm_runtime_active(dev))
626 return mlx90614_sleep(data);
627
628 return 0;
629 }
630
mlx90614_pm_resume(struct device * dev)631 static int mlx90614_pm_resume(struct device *dev)
632 {
633 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
634 struct mlx90614_data *data = iio_priv(indio_dev);
635 int err;
636
637 if (data->wakeup_gpio) {
638 err = mlx90614_wakeup(data);
639 if (err < 0)
640 return err;
641
642 pm_runtime_disable(dev);
643 pm_runtime_set_active(dev);
644 pm_runtime_enable(dev);
645 }
646
647 return 0;
648 }
649
mlx90614_pm_runtime_suspend(struct device * dev)650 static int mlx90614_pm_runtime_suspend(struct device *dev)
651 {
652 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
653 struct mlx90614_data *data = iio_priv(indio_dev);
654
655 return mlx90614_sleep(data);
656 }
657
mlx90614_pm_runtime_resume(struct device * dev)658 static int mlx90614_pm_runtime_resume(struct device *dev)
659 {
660 struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
661 struct mlx90614_data *data = iio_priv(indio_dev);
662
663 return mlx90614_wakeup(data);
664 }
665
666 static const struct dev_pm_ops mlx90614_pm_ops = {
667 SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume)
668 RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend,
669 mlx90614_pm_runtime_resume, NULL)
670 };
671
672 static struct i2c_driver mlx90614_driver = {
673 .driver = {
674 .name = "mlx90614",
675 .of_match_table = mlx90614_of_match,
676 .pm = pm_ptr(&mlx90614_pm_ops),
677 },
678 .probe = mlx90614_probe,
679 .remove = mlx90614_remove,
680 .id_table = mlx90614_id,
681 };
682 module_i2c_driver(mlx90614_driver);
683
684 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
685 MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
686 MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
687 MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
688 MODULE_LICENSE("GPL");
689
