mlx90614.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * mlx90614.c - Support for Melexis MLX90614/MLX90615 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/MLX90615 I2C 16-bit IR thermopile sensor
 10 *
 11 * MLX90614 - 17-bit ADC + MLX90302 DSP
 12 * MLX90615 - 16-bit ADC + MLX90325 DSP
 13 *
 14 * (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
 15 *
 16 * To wake up from sleep mode, the SDA line must be held low while SCL is high
 17 * for at least 33ms.  This is achieved with an extra GPIO that can be connected
 18 * directly to the SDA line.  In normal operation, the GPIO is set as input and
 19 * will not interfere in I2C communication.  While the GPIO is driven low, the
 20 * i2c adapter is locked since it cannot be used by other clients.  The SCL line
 21 * always has a pull-up so we do not need an extra GPIO to drive it high.  If
 22 * the "wakeup" GPIO is not given, power management will be disabled.
 23 */
 24
 25#include <linux/bitfield.h>
 26#include <linux/delay.h>
 27#include <linux/err.h>
 28#include <linux/gpio/consumer.h>
 29#include <linux/i2c.h>
 30#include <linux/jiffies.h>
 31#include <linux/mod_devicetable.h>
 32#include <linux/module.h>
 33#include <linux/pm_runtime.h>
 34
 35#include <linux/iio/iio.h>
 36#include <linux/iio/sysfs.h>
 37
 38#define MLX90614_OP_RAM		0x00
 39#define MLX90614_OP_EEPROM	0x20
 40#define MLX90614_OP_SLEEP	0xff
 41
 42#define MLX90615_OP_EEPROM	0x10
 43#define MLX90615_OP_RAM		0x20
 44#define MLX90615_OP_SLEEP	0xc6
 45
 46/* Control bits in configuration register */
 47#define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
 48#define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
 49#define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */
 50#define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
 51#define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
 52#define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
 53
 54#define MLX90615_CONFIG_IIR_SHIFT 12 /* IIR coefficient */
 55#define MLX90615_CONFIG_IIR_MASK (0x7 << MLX90615_CONFIG_IIR_SHIFT)
 56
 57/* Timings (in ms) */
 58#define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
 59#define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
 60#define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
 61
 62#define MLX90615_TIMING_WAKEUP 22 /* time to hold SCL low for wake-up */
 63
 64#define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */
 65
 66/* Magic constants */
 67#define MLX90614_CONST_OFFSET_DEC -13657 /* decimal part of the Kelvin offset */
 68#define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */
 69#define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */
 70#define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */
 71
 72struct mlx_chip_info {
 73	/* EEPROM offsets with 16-bit data, MSB first */
 74	/* emissivity correction coefficient */
 75	u8			op_eeprom_emissivity;
 76	u8			op_eeprom_config1;
 77	/* RAM offsets with 16-bit data, MSB first */
 78	/* ambient temperature */
 79	u8			op_ram_ta;
 80	/* object 1 temperature */
 81	u8			op_ram_tobj1;
 82	/* object 2 temperature */
 83	u8			op_ram_tobj2;
 84	u8			op_sleep;
 85	/* support for two input channels (MLX90614 only) */
 86	u8			dual_channel;
 87	u8			wakeup_delay_ms;
 88	u16			emissivity_max;
 89	u16			fir_config_mask;
 90	u16			iir_config_mask;
 91	int			iir_valid_offset;
 92	u16			iir_values[8];
 93	int			iir_freqs[8][2];
 94};
 95
 96struct mlx90614_data {
 97	struct i2c_client *client;
 98	struct mutex lock; /* for EEPROM access only */
 99	struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */
100	const struct mlx_chip_info *chip_info; /* Chip hardware details */
101	unsigned long ready_timestamp; /* in jiffies */
102};
103
104/*
105 * Erase an address and write word.
106 * The mutex must be locked before calling.
107 */
108static s32 mlx90614_write_word(const struct i2c_client *client, u8 command,
109			       u16 value)
110{
111	/*
112	 * Note: The mlx90614 requires a PEC on writing but does not send us a
113	 * valid PEC on reading.  Hence, we cannot set I2C_CLIENT_PEC in
114	 * i2c_client.flags.  As a workaround, we use i2c_smbus_xfer here.
115	 */
116	union i2c_smbus_data data;
117	s32 ret;
118
119	dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command);
120
121	data.word = 0x0000; /* erase command */
122	ret = i2c_smbus_xfer(client->adapter, client->addr,
123			     client->flags | I2C_CLIENT_PEC,
124			     I2C_SMBUS_WRITE, command,
125			     I2C_SMBUS_WORD_DATA, &data);
126	if (ret < 0)
127		return ret;
128
129	msleep(MLX90614_TIMING_EEPROM);
130
131	data.word = value; /* actual write */
132	ret = i2c_smbus_xfer(client->adapter, client->addr,
133			     client->flags | I2C_CLIENT_PEC,
134			     I2C_SMBUS_WRITE, command,
135			     I2C_SMBUS_WORD_DATA, &data);
136
137	msleep(MLX90614_TIMING_EEPROM);
138
139	return ret;
140}
141
142/*
143 * Find the IIR value inside iir_values array and return its position
144 * which is equivalent to the bit value in sensor register
145 */
146static inline s32 mlx90614_iir_search(const struct i2c_client *client,
147				      int value)
148{
149	struct iio_dev *indio_dev = i2c_get_clientdata(client);
150	struct mlx90614_data *data = iio_priv(indio_dev);
151	const struct mlx_chip_info *chip_info = data->chip_info;
152	int i;
153	s32 ret;
154
155	for (i = chip_info->iir_valid_offset;
156	     i < ARRAY_SIZE(chip_info->iir_values);
157	     i++) {
158		if (value == chip_info->iir_values[i])
159			break;
160	}
161
162	if (i == ARRAY_SIZE(chip_info->iir_values))
163		return -EINVAL;
164
165	/*
166	 * CONFIG register values must not be changed so
167	 * we must read them before we actually write
168	 * changes
169	 */
170	ret = i2c_smbus_read_word_data(client, chip_info->op_eeprom_config1);
171	if (ret < 0)
172		return ret;
173
174	/* Modify FIR on parts which have configurable FIR filter */
175	if (chip_info->fir_config_mask) {
176		ret &= ~chip_info->fir_config_mask;
177		ret |= field_prep(chip_info->fir_config_mask, MLX90614_CONST_FIR);
178	}
179
180	ret &= ~chip_info->iir_config_mask;
181	ret |= field_prep(chip_info->iir_config_mask, i);
182
183	/* Write changed values */
184	ret = mlx90614_write_word(client, chip_info->op_eeprom_config1, ret);
185	return ret;
186}
187
188#ifdef CONFIG_PM
189/*
190 * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since
191 * the last wake-up.  This is normally only needed to get a valid temperature
192 * reading.  EEPROM access does not need such delay.
193 * Return 0 on success, <0 on error.
194 */
195static int mlx90614_power_get(struct mlx90614_data *data, bool startup)
196{
197	unsigned long now;
198	int ret;
199
200	if (!data->wakeup_gpio)
201		return 0;
202
203	ret = pm_runtime_resume_and_get(&data->client->dev);
204	if (ret < 0)
205		return ret;
206
207	if (startup) {
208		now = jiffies;
209		if (time_before(now, data->ready_timestamp) &&
210		    msleep_interruptible(jiffies_to_msecs(
211				data->ready_timestamp - now)) != 0) {
212			pm_runtime_put_autosuspend(&data->client->dev);
213			return -EINTR;
214		}
215	}
216
217	return 0;
218}
219
220static void mlx90614_power_put(struct mlx90614_data *data)
221{
222	if (!data->wakeup_gpio)
223		return;
224
225	pm_runtime_put_autosuspend(&data->client->dev);
226}
227#else
228static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup)
229{
230	return 0;
231}
232
233static inline void mlx90614_power_put(struct mlx90614_data *data)
234{
235}
236#endif
237
238static int mlx90614_read_raw(struct iio_dev *indio_dev,
239			    struct iio_chan_spec const *channel, int *val,
240			    int *val2, long mask)
241{
242	struct mlx90614_data *data = iio_priv(indio_dev);
243	const struct mlx_chip_info *chip_info = data->chip_info;
244	u8 cmd, idx;
245	s32 ret;
246
247	switch (mask) {
248	case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
249		switch (channel->channel2) {
250		case IIO_MOD_TEMP_AMBIENT:
251			cmd = chip_info->op_ram_ta;
252			break;
253		case IIO_MOD_TEMP_OBJECT:
254			if (chip_info->dual_channel && channel->channel)
255				return -EINVAL;
256
257			switch (channel->channel) {
258			case 0:
259				cmd = chip_info->op_ram_tobj1;
260				break;
261			case 1:
262				cmd = chip_info->op_ram_tobj2;
263				break;
264			default:
265				return -EINVAL;
266			}
267			break;
268		default:
269			return -EINVAL;
270		}
271
272		ret = mlx90614_power_get(data, true);
273		if (ret < 0)
274			return ret;
275		ret = i2c_smbus_read_word_data(data->client, cmd);
276		mlx90614_power_put(data);
277
278		if (ret < 0)
279			return ret;
280
281		/* MSB is an error flag */
282		if (ret & 0x8000)
283			return -EIO;
284
285		*val = ret;
286		return IIO_VAL_INT;
287	case IIO_CHAN_INFO_OFFSET:
288		*val = MLX90614_CONST_OFFSET_DEC;
289		*val2 = MLX90614_CONST_OFFSET_REM;
290		return IIO_VAL_INT_PLUS_MICRO;
291	case IIO_CHAN_INFO_SCALE:
292		*val = MLX90614_CONST_SCALE;
293		return IIO_VAL_INT;
294	case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/emissivity_max / LSB */
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,
301					       chip_info->op_eeprom_emissivity);
302		mutex_unlock(&data->lock);
303		mlx90614_power_put(data);
304
305		if (ret < 0)
306			return ret;
307
308		if (ret == chip_info->emissivity_max) {
309			*val = 1;
310			*val2 = 0;
311		} else {
312			*val = 0;
313			*val2 = ret * NSEC_PER_SEC / chip_info->emissivity_max;
314		}
315		return IIO_VAL_INT_PLUS_NANO;
316	/* IIR setting with FIR=1024 (MLX90614) or FIR=65536 (MLX90615) */
317	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
318		ret = mlx90614_power_get(data, false);
319		if (ret < 0)
320			return ret;
321
322		mutex_lock(&data->lock);
323		ret = i2c_smbus_read_word_data(data->client,
324					       chip_info->op_eeprom_config1);
325		mutex_unlock(&data->lock);
326		mlx90614_power_put(data);
327
328		if (ret < 0)
329			return ret;
330
331		idx = field_get(chip_info->iir_config_mask, ret) -
332		      chip_info->iir_valid_offset;
333
334		*val = chip_info->iir_values[idx] / 100;
335		*val2 = (chip_info->iir_values[idx] % 100) * 10000;
336		return IIO_VAL_INT_PLUS_MICRO;
337	default:
338		return -EINVAL;
339	}
340}
341
342static int mlx90614_write_raw(struct iio_dev *indio_dev,
343			     struct iio_chan_spec const *channel, int val,
344			     int val2, long mask)
345{
346	struct mlx90614_data *data = iio_priv(indio_dev);
347	const struct mlx_chip_info *chip_info = data->chip_info;
348	s32 ret;
349
350	switch (mask) {
351	case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/emissivity_max / LSB */
352		if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
353			return -EINVAL;
354		val = val * chip_info->emissivity_max +
355		      val2 * chip_info->emissivity_max / NSEC_PER_SEC;
356
357		ret = mlx90614_power_get(data, false);
358		if (ret < 0)
359			return ret;
360
361		mutex_lock(&data->lock);
362		ret = mlx90614_write_word(data->client,
363					  chip_info->op_eeprom_emissivity, val);
364		mutex_unlock(&data->lock);
365		mlx90614_power_put(data);
366
367		return ret;
368	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */
369		if (val < 0 || val2 < 0)
370			return -EINVAL;
371
372		ret = mlx90614_power_get(data, false);
373		if (ret < 0)
374			return ret;
375
376		mutex_lock(&data->lock);
377		ret = mlx90614_iir_search(data->client,
378					  val * 100 + val2 / 10000);
379		mutex_unlock(&data->lock);
380		mlx90614_power_put(data);
381
382		return ret;
383	default:
384		return -EINVAL;
385	}
386}
387
388static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev,
389				     struct iio_chan_spec const *channel,
390				     long mask)
391{
392	switch (mask) {
393	case IIO_CHAN_INFO_CALIBEMISSIVITY:
394		return IIO_VAL_INT_PLUS_NANO;
395	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
396		return IIO_VAL_INT_PLUS_MICRO;
397	default:
398		return -EINVAL;
399	}
400}
401
402static int mlx90614_read_avail(struct iio_dev *indio_dev,
403			       struct iio_chan_spec const *chan,
404			       const int **vals, int *type, int *length,
405			       long mask)
406{
407	struct mlx90614_data *data = iio_priv(indio_dev);
408	const struct mlx_chip_info *chip_info = data->chip_info;
409
410	switch (mask) {
411	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
412		*vals = (int *)chip_info->iir_freqs;
413		*type = IIO_VAL_INT_PLUS_MICRO;
414		*length = 2 * (ARRAY_SIZE(chip_info->iir_freqs) -
415			       chip_info->iir_valid_offset);
416		return IIO_AVAIL_LIST;
417	default:
418		return -EINVAL;
419	}
420}
421
422static const struct iio_chan_spec mlx90614_channels[] = {
423	{
424		.type = IIO_TEMP,
425		.modified = 1,
426		.channel2 = IIO_MOD_TEMP_AMBIENT,
427		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
428		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
429		    BIT(IIO_CHAN_INFO_SCALE),
430	},
431	{
432		.type = IIO_TEMP,
433		.modified = 1,
434		.channel2 = IIO_MOD_TEMP_OBJECT,
435		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
436		    BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
437			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
438		.info_mask_separate_available =
439			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
440		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
441		    BIT(IIO_CHAN_INFO_SCALE),
442	},
443	{
444		.type = IIO_TEMP,
445		.indexed = 1,
446		.modified = 1,
447		.channel = 1,
448		.channel2 = IIO_MOD_TEMP_OBJECT,
449		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
450		    BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
451			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
452		.info_mask_separate_available =
453			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
454		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
455		    BIT(IIO_CHAN_INFO_SCALE),
456	},
457};
458
459static const struct iio_info mlx90614_info = {
460	.read_raw = mlx90614_read_raw,
461	.write_raw = mlx90614_write_raw,
462	.write_raw_get_fmt = mlx90614_write_raw_get_fmt,
463	.read_avail = mlx90614_read_avail,
464};
465
466#ifdef CONFIG_PM
467static int mlx90614_sleep(struct mlx90614_data *data)
468{
469	const struct mlx_chip_info *chip_info = data->chip_info;
470	s32 ret;
471
472	if (!data->wakeup_gpio) {
473		dev_dbg(&data->client->dev, "Sleep disabled");
474		return -ENOSYS;
475	}
476
477	dev_dbg(&data->client->dev, "Requesting sleep");
478
479	mutex_lock(&data->lock);
480	ret = i2c_smbus_xfer(data->client->adapter, data->client->addr,
481			     data->client->flags | I2C_CLIENT_PEC,
482			     I2C_SMBUS_WRITE, chip_info->op_sleep,
483			     I2C_SMBUS_BYTE, NULL);
484	mutex_unlock(&data->lock);
485
486	return ret;
487}
488
489static int mlx90614_wakeup(struct mlx90614_data *data)
490{
491	const struct mlx_chip_info *chip_info = data->chip_info;
492
493	if (!data->wakeup_gpio) {
494		dev_dbg(&data->client->dev, "Wake-up disabled");
495		return -ENOSYS;
496	}
497
498	dev_dbg(&data->client->dev, "Requesting wake-up");
499
500	i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
501	gpiod_direction_output(data->wakeup_gpio, 0);
502	msleep(chip_info->wakeup_delay_ms);
503	gpiod_direction_input(data->wakeup_gpio);
504	i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
505
506	data->ready_timestamp = jiffies +
507			msecs_to_jiffies(MLX90614_TIMING_STARTUP);
508
509	/*
510	 * Quirk: the i2c controller may get confused right after the
511	 * wake-up signal has been sent.  As a workaround, do a dummy read.
512	 * If the read fails, the controller will probably be reset so that
513	 * further reads will work.
514	 */
515	i2c_smbus_read_word_data(data->client, chip_info->op_eeprom_config1);
516
517	return 0;
518}
519
520/* Return wake-up GPIO or NULL if sleep functionality should be disabled. */
521static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
522{
523	struct gpio_desc *gpio;
524
525	if (!i2c_check_functionality(client->adapter,
526						I2C_FUNC_SMBUS_WRITE_BYTE)) {
527		dev_info(&client->dev,
528			 "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled");
529		return NULL;
530	}
531
532	gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN);
533
534	if (IS_ERR(gpio)) {
535		dev_warn(&client->dev,
536			 "gpio acquisition failed with error %ld, sleep disabled",
537			 PTR_ERR(gpio));
538		return NULL;
539	} else if (!gpio) {
540		dev_info(&client->dev,
541			 "wakeup-gpio not found, sleep disabled");
542	}
543
544	return gpio;
545}
546#else
547static inline int mlx90614_sleep(struct mlx90614_data *data)
548{
549	return -ENOSYS;
550}
551static inline int mlx90614_wakeup(struct mlx90614_data *data)
552{
553	return -ENOSYS;
554}
555static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
556{
557	return NULL;
558}
559#endif
560
561/* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
562static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
563{
564	struct iio_dev *indio_dev = i2c_get_clientdata(client);
565	struct mlx90614_data *data = iio_priv(indio_dev);
566	const struct mlx_chip_info *chip_info = data->chip_info;
567	s32 ret;
568
569	if (chip_info->dual_channel)
570		return 0;
571
572	ret = i2c_smbus_read_word_data(client, chip_info->op_eeprom_config1);
573
574	if (ret < 0)
575		return ret;
576
577	return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
578}
579
580static int mlx90614_probe(struct i2c_client *client)
581{
582	const struct i2c_device_id *id = i2c_client_get_device_id(client);
583	struct iio_dev *indio_dev;
584	struct mlx90614_data *data;
585	int ret;
586
587	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
588		return -EOPNOTSUPP;
589
590	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
591	if (!indio_dev)
592		return -ENOMEM;
593
594	data = iio_priv(indio_dev);
595	i2c_set_clientdata(client, indio_dev);
596	data->client = client;
597	mutex_init(&data->lock);
598	data->wakeup_gpio = mlx90614_probe_wakeup(client);
599	data->chip_info = i2c_get_match_data(client);
600
601	mlx90614_wakeup(data);
602
603	indio_dev->name = id->name;
604	indio_dev->modes = INDIO_DIRECT_MODE;
605	indio_dev->info = &mlx90614_info;
606
607	ret = mlx90614_probe_num_ir_sensors(client);
608	switch (ret) {
609	case 0:
610		dev_dbg(&client->dev, "Found single sensor");
611		indio_dev->channels = mlx90614_channels;
612		indio_dev->num_channels = 2;
613		break;
614	case 1:
615		dev_dbg(&client->dev, "Found dual sensor");
616		indio_dev->channels = mlx90614_channels;
617		indio_dev->num_channels = 3;
618		break;
619	default:
620		return ret;
621	}
622
623	if (data->wakeup_gpio) {
624		pm_runtime_set_autosuspend_delay(&client->dev,
625						 MLX90614_AUTOSLEEP_DELAY);
626		pm_runtime_use_autosuspend(&client->dev);
627		pm_runtime_set_active(&client->dev);
628		pm_runtime_enable(&client->dev);
629	}
630
631	return iio_device_register(indio_dev);
632}
633
634static void mlx90614_remove(struct i2c_client *client)
635{
636	struct iio_dev *indio_dev = i2c_get_clientdata(client);
637	struct mlx90614_data *data = iio_priv(indio_dev);
638
639	iio_device_unregister(indio_dev);
640
641	if (data->wakeup_gpio) {
642		pm_runtime_disable(&client->dev);
643		if (!pm_runtime_status_suspended(&client->dev))
644			mlx90614_sleep(data);
645		pm_runtime_set_suspended(&client->dev);
646	}
647}
648
649static const struct mlx_chip_info mlx90614_chip_info = {
650	.op_eeprom_emissivity		= MLX90614_OP_EEPROM | 0x04,
651	.op_eeprom_config1		= MLX90614_OP_EEPROM | 0x05,
652	.op_ram_ta			= MLX90614_OP_RAM | 0x06,
653	.op_ram_tobj1			= MLX90614_OP_RAM | 0x07,
654	.op_ram_tobj2			= MLX90614_OP_RAM | 0x08,
655	.op_sleep			= MLX90614_OP_SLEEP,
656	.dual_channel			= true,
657	.wakeup_delay_ms		= MLX90614_TIMING_WAKEUP,
658	.emissivity_max			= 65535,
659	.fir_config_mask		= MLX90614_CONFIG_FIR_MASK,
660	.iir_config_mask		= MLX90614_CONFIG_IIR_MASK,
661	.iir_valid_offset		= 0,
662	.iir_values			= { 77, 31, 20, 15, 723, 153, 110, 86 },
663	.iir_freqs			= {
664		{ 0, 150000 },	/* 13% ~= 0.15 Hz */
665		{ 0, 200000 },	/* 17% ~= 0.20 Hz */
666		{ 0, 310000 },	/* 25% ~= 0.31 Hz */
667		{ 0, 770000 },	/* 50% ~= 0.77 Hz */
668		{ 0, 860000 },	/* 57% ~= 0.86 Hz */
669		{ 1, 100000 },	/* 67% ~= 1.10 Hz */
670		{ 1, 530000 },	/* 80% ~= 1.53 Hz */
671		{ 7, 230000 }	/* 100% ~= 7.23 Hz */
672	},
673};
674
675static const struct mlx_chip_info mlx90615_chip_info = {
676	.op_eeprom_emissivity		= MLX90615_OP_EEPROM | 0x03,
677	.op_eeprom_config1		= MLX90615_OP_EEPROM | 0x02,
678	.op_ram_ta			= MLX90615_OP_RAM | 0x06,
679	.op_ram_tobj1			= MLX90615_OP_RAM | 0x07,
680	.op_ram_tobj2			= MLX90615_OP_RAM | 0x08,
681	.op_sleep			= MLX90615_OP_SLEEP,
682	.dual_channel			= false,
683	.wakeup_delay_ms		= MLX90615_TIMING_WAKEUP,
684	.emissivity_max			= 16383,
685	.fir_config_mask		= 0,	/* MLX90615 FIR is fixed */
686	.iir_config_mask		= MLX90615_CONFIG_IIR_MASK,
687	/* IIR value 0 is FORBIDDEN COMBINATION on MLX90615 */
688	.iir_valid_offset		= 1,
689	.iir_values			= { 500, 50, 30, 20, 15, 13, 10 },
690	.iir_freqs			= {
691		{ 0, 100000 },	/* 14% ~= 0.10 Hz */
692		{ 0, 130000 },	/* 17% ~= 0.13 Hz */
693		{ 0, 150000 },	/* 20% ~= 0.15 Hz */
694		{ 0, 200000 },	/* 25% ~= 0.20 Hz */
695		{ 0, 300000 },	/* 33% ~= 0.30 Hz */
696		{ 0, 500000 },	/* 50% ~= 0.50 Hz */
697		{ 5, 000000 },	/* 100% ~= 5.00 Hz */
698	},
699};
700
701static const struct i2c_device_id mlx90614_id[] = {
702	{ "mlx90614", .driver_data = (kernel_ulong_t)&mlx90614_chip_info },
703	{ "mlx90615", .driver_data = (kernel_ulong_t)&mlx90615_chip_info },
704	{ }
705};
706MODULE_DEVICE_TABLE(i2c, mlx90614_id);
707
708static const struct of_device_id mlx90614_of_match[] = {
709	{ .compatible = "melexis,mlx90614", .data = &mlx90614_chip_info },
710	{ .compatible = "melexis,mlx90615", .data = &mlx90615_chip_info },
711	{ }
712};
713MODULE_DEVICE_TABLE(of, mlx90614_of_match);
714
715static int mlx90614_pm_suspend(struct device *dev)
716{
717	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
718	struct mlx90614_data *data = iio_priv(indio_dev);
719
720	if (data->wakeup_gpio && pm_runtime_active(dev))
721		return mlx90614_sleep(data);
722
723	return 0;
724}
725
726static int mlx90614_pm_resume(struct device *dev)
727{
728	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
729	struct mlx90614_data *data = iio_priv(indio_dev);
730	int err;
731
732	if (data->wakeup_gpio) {
733		err = mlx90614_wakeup(data);
734		if (err < 0)
735			return err;
736
737		pm_runtime_disable(dev);
738		pm_runtime_set_active(dev);
739		pm_runtime_enable(dev);
740	}
741
742	return 0;
743}
744
745static int mlx90614_pm_runtime_suspend(struct device *dev)
746{
747	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
748	struct mlx90614_data *data = iio_priv(indio_dev);
749
750	return mlx90614_sleep(data);
751}
752
753static int mlx90614_pm_runtime_resume(struct device *dev)
754{
755	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
756	struct mlx90614_data *data = iio_priv(indio_dev);
757
758	return mlx90614_wakeup(data);
759}
760
761static const struct dev_pm_ops mlx90614_pm_ops = {
762	SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume)
763	RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend,
764		       mlx90614_pm_runtime_resume, NULL)
765};
766
767static struct i2c_driver mlx90614_driver = {
768	.driver = {
769		.name	= "mlx90614",
770		.of_match_table = mlx90614_of_match,
771		.pm	= pm_ptr(&mlx90614_pm_ops),
772	},
773	.probe = mlx90614_probe,
774	.remove = mlx90614_remove,
775	.id_table = mlx90614_id,
776};
777module_i2c_driver(mlx90614_driver);
778
779MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
780MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
781MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
782MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
783MODULE_LICENSE("GPL");