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36edc939 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
474fe212 PM |
2 | /* |
3 | * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor | |
4 | * | |
5 | * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net> | |
bad4d1a0 | 6 | * Copyright (c) 2015 Essensium NV |
764589b6 | 7 | * Copyright (c) 2015 Melexis |
474fe212 | 8 | * |
474fe212 PM |
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 | * | |
eb4b07da VCSM |
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. | |
474fe212 PM |
20 | */ |
21 | ||
22 | #include <linux/err.h> | |
23 | #include <linux/i2c.h> | |
24 | #include <linux/module.h> | |
fad65a8f | 25 | #include <linux/delay.h> |
eb4b07da VCSM |
26 | #include <linux/jiffies.h> |
27 | #include <linux/gpio/consumer.h> | |
28 | #include <linux/pm_runtime.h> | |
474fe212 PM |
29 | |
30 | #include <linux/iio/iio.h> | |
764589b6 | 31 | #include <linux/iio/sysfs.h> |
474fe212 | 32 | |
209c0069 VCSM |
33 | #define MLX90614_OP_RAM 0x00 |
34 | #define MLX90614_OP_EEPROM 0x20 | |
35 | #define MLX90614_OP_SLEEP 0xff | |
474fe212 PM |
36 | |
37 | /* RAM offsets with 16-bit data, MSB first */ | |
209c0069 VCSM |
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 */ | |
c7586584 VCSM |
40 | #define MLX90614_TA (MLX90614_OP_RAM | 0x06) /* ambient temperature */ |
41 | #define MLX90614_TOBJ1 (MLX90614_OP_RAM | 0x07) /* object 1 temperature */ | |
209c0069 VCSM |
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 */ | |
474fe212 | 62 | |
eb4b07da VCSM |
63 | #define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */ |
64 | ||
f9ba1ab4 CM |
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 */ | |
1de953e7 | 71 | #define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */ |
f9ba1ab4 | 72 | |
474fe212 PM |
73 | struct mlx90614_data { |
74 | struct i2c_client *client; | |
fad65a8f | 75 | struct mutex lock; /* for EEPROM access only */ |
eb4b07da VCSM |
76 | struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */ |
77 | unsigned long ready_timestamp; /* in jiffies */ | |
474fe212 PM |
78 | }; |
79 | ||
764589b6 CM |
80 | /* Bandwidth values for IIR filtering */ |
81 | static const int mlx90614_iir_values[] = {77, 31, 20, 15, 723, 153, 110, 86}; | |
82 | static IIO_CONST_ATTR(in_temp_object_filter_low_pass_3db_frequency_available, | |
83 | "0.15 0.20 0.31 0.77 0.86 1.10 1.53 7.23"); | |
84 | ||
85 | static struct attribute *mlx90614_attributes[] = { | |
86 | &iio_const_attr_in_temp_object_filter_low_pass_3db_frequency_available.dev_attr.attr, | |
87 | NULL, | |
88 | }; | |
89 | ||
90 | static const struct attribute_group mlx90614_attr_group = { | |
91 | .attrs = mlx90614_attributes, | |
92 | }; | |
93 | ||
fad65a8f VCSM |
94 | /* |
95 | * Erase an address and write word. | |
96 | * The mutex must be locked before calling. | |
97 | */ | |
98 | static s32 mlx90614_write_word(const struct i2c_client *client, u8 command, | |
99 | u16 value) | |
100 | { | |
101 | /* | |
102 | * Note: The mlx90614 requires a PEC on writing but does not send us a | |
103 | * valid PEC on reading. Hence, we cannot set I2C_CLIENT_PEC in | |
104 | * i2c_client.flags. As a workaround, we use i2c_smbus_xfer here. | |
105 | */ | |
106 | union i2c_smbus_data data; | |
107 | s32 ret; | |
108 | ||
109 | dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command); | |
110 | ||
111 | data.word = 0x0000; /* erase command */ | |
112 | ret = i2c_smbus_xfer(client->adapter, client->addr, | |
113 | client->flags | I2C_CLIENT_PEC, | |
114 | I2C_SMBUS_WRITE, command, | |
115 | I2C_SMBUS_WORD_DATA, &data); | |
116 | if (ret < 0) | |
117 | return ret; | |
118 | ||
119 | msleep(MLX90614_TIMING_EEPROM); | |
120 | ||
121 | data.word = value; /* actual write */ | |
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 | ||
127 | msleep(MLX90614_TIMING_EEPROM); | |
128 | ||
129 | return ret; | |
130 | } | |
131 | ||
764589b6 CM |
132 | /* |
133 | * Find the IIR value inside mlx90614_iir_values array and return its position | |
134 | * which is equivalent to the bit value in sensor register | |
135 | */ | |
136 | static inline s32 mlx90614_iir_search(const struct i2c_client *client, | |
137 | int value) | |
138 | { | |
139 | int i; | |
140 | s32 ret; | |
141 | ||
142 | for (i = 0; i < ARRAY_SIZE(mlx90614_iir_values); ++i) { | |
143 | if (value == mlx90614_iir_values[i]) | |
144 | break; | |
145 | } | |
146 | ||
147 | if (i == ARRAY_SIZE(mlx90614_iir_values)) | |
148 | return -EINVAL; | |
149 | ||
150 | /* | |
151 | * CONFIG register values must not be changed so | |
152 | * we must read them before we actually write | |
153 | * changes | |
154 | */ | |
155 | ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG); | |
1de953e7 | 156 | if (ret < 0) |
764589b6 CM |
157 | return ret; |
158 | ||
1de953e7 CM |
159 | ret &= ~MLX90614_CONFIG_FIR_MASK; |
160 | ret |= MLX90614_CONST_FIR << MLX90614_CONFIG_FIR_SHIFT; | |
161 | ret &= ~MLX90614_CONFIG_IIR_MASK; | |
162 | ret |= i << MLX90614_CONFIG_IIR_SHIFT; | |
163 | ||
764589b6 | 164 | /* Write changed values */ |
1de953e7 | 165 | ret = mlx90614_write_word(client, MLX90614_CONFIG, ret); |
764589b6 CM |
166 | return ret; |
167 | } | |
168 | ||
eb4b07da VCSM |
169 | #ifdef CONFIG_PM |
170 | /* | |
171 | * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since | |
172 | * the last wake-up. This is normally only needed to get a valid temperature | |
173 | * reading. EEPROM access does not need such delay. | |
174 | * Return 0 on success, <0 on error. | |
175 | */ | |
176 | static int mlx90614_power_get(struct mlx90614_data *data, bool startup) | |
177 | { | |
178 | unsigned long now; | |
179 | ||
180 | if (!data->wakeup_gpio) | |
181 | return 0; | |
182 | ||
183 | pm_runtime_get_sync(&data->client->dev); | |
184 | ||
185 | if (startup) { | |
186 | now = jiffies; | |
187 | if (time_before(now, data->ready_timestamp) && | |
188 | msleep_interruptible(jiffies_to_msecs( | |
189 | data->ready_timestamp - now)) != 0) { | |
190 | pm_runtime_put_autosuspend(&data->client->dev); | |
191 | return -EINTR; | |
192 | } | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static void mlx90614_power_put(struct mlx90614_data *data) | |
199 | { | |
200 | if (!data->wakeup_gpio) | |
201 | return; | |
202 | ||
203 | pm_runtime_mark_last_busy(&data->client->dev); | |
204 | pm_runtime_put_autosuspend(&data->client->dev); | |
205 | } | |
206 | #else | |
207 | static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup) | |
208 | { | |
209 | return 0; | |
210 | } | |
211 | ||
212 | static inline void mlx90614_power_put(struct mlx90614_data *data) | |
213 | { | |
214 | } | |
215 | #endif | |
216 | ||
474fe212 PM |
217 | static int mlx90614_read_raw(struct iio_dev *indio_dev, |
218 | struct iio_chan_spec const *channel, int *val, | |
219 | int *val2, long mask) | |
220 | { | |
221 | struct mlx90614_data *data = iio_priv(indio_dev); | |
bad4d1a0 | 222 | u8 cmd; |
474fe212 PM |
223 | s32 ret; |
224 | ||
225 | switch (mask) { | |
226 | case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */ | |
227 | switch (channel->channel2) { | |
228 | case IIO_MOD_TEMP_AMBIENT: | |
bad4d1a0 | 229 | cmd = MLX90614_TA; |
474fe212 PM |
230 | break; |
231 | case IIO_MOD_TEMP_OBJECT: | |
bad4d1a0 VCSM |
232 | switch (channel->channel) { |
233 | case 0: | |
234 | cmd = MLX90614_TOBJ1; | |
235 | break; | |
236 | case 1: | |
237 | cmd = MLX90614_TOBJ2; | |
238 | break; | |
239 | default: | |
240 | return -EINVAL; | |
241 | } | |
474fe212 PM |
242 | break; |
243 | default: | |
244 | return -EINVAL; | |
245 | } | |
bad4d1a0 | 246 | |
eb4b07da VCSM |
247 | ret = mlx90614_power_get(data, true); |
248 | if (ret < 0) | |
249 | return ret; | |
bad4d1a0 | 250 | ret = i2c_smbus_read_word_data(data->client, cmd); |
eb4b07da VCSM |
251 | mlx90614_power_put(data); |
252 | ||
bad4d1a0 VCSM |
253 | if (ret < 0) |
254 | return ret; | |
d02e0f8f VCSM |
255 | |
256 | /* MSB is an error flag */ | |
257 | if (ret & 0x8000) | |
258 | return -EIO; | |
259 | ||
474fe212 PM |
260 | *val = ret; |
261 | return IIO_VAL_INT; | |
262 | case IIO_CHAN_INFO_OFFSET: | |
f9ba1ab4 CM |
263 | *val = MLX90614_CONST_OFFSET_DEC; |
264 | *val2 = MLX90614_CONST_OFFSET_REM; | |
474fe212 PM |
265 | return IIO_VAL_INT_PLUS_MICRO; |
266 | case IIO_CHAN_INFO_SCALE: | |
f9ba1ab4 | 267 | *val = MLX90614_CONST_SCALE; |
474fe212 | 268 | return IIO_VAL_INT; |
fad65a8f | 269 | case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */ |
eb4b07da | 270 | mlx90614_power_get(data, false); |
fad65a8f VCSM |
271 | mutex_lock(&data->lock); |
272 | ret = i2c_smbus_read_word_data(data->client, | |
273 | MLX90614_EMISSIVITY); | |
274 | mutex_unlock(&data->lock); | |
eb4b07da | 275 | mlx90614_power_put(data); |
fad65a8f VCSM |
276 | |
277 | if (ret < 0) | |
278 | return ret; | |
279 | ||
f9ba1ab4 | 280 | if (ret == MLX90614_CONST_RAW_EMISSIVITY_MAX) { |
fad65a8f VCSM |
281 | *val = 1; |
282 | *val2 = 0; | |
283 | } else { | |
284 | *val = 0; | |
f9ba1ab4 | 285 | *val2 = ret * MLX90614_CONST_EMISSIVITY_RESOLUTION; |
fad65a8f VCSM |
286 | } |
287 | return IIO_VAL_INT_PLUS_NANO; | |
764589b6 CM |
288 | case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR setting with |
289 | FIR = 1024 */ | |
290 | mlx90614_power_get(data, false); | |
291 | mutex_lock(&data->lock); | |
292 | ret = i2c_smbus_read_word_data(data->client, MLX90614_CONFIG); | |
293 | mutex_unlock(&data->lock); | |
294 | mlx90614_power_put(data); | |
295 | ||
296 | if (ret < 0) | |
297 | return ret; | |
298 | ||
299 | *val = mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] / 100; | |
300 | *val2 = (mlx90614_iir_values[ret & MLX90614_CONFIG_IIR_MASK] % 100) * | |
301 | 10000; | |
302 | return IIO_VAL_INT_PLUS_MICRO; | |
fad65a8f VCSM |
303 | default: |
304 | return -EINVAL; | |
305 | } | |
306 | } | |
307 | ||
308 | static int mlx90614_write_raw(struct iio_dev *indio_dev, | |
309 | struct iio_chan_spec const *channel, int val, | |
310 | int val2, long mask) | |
311 | { | |
312 | struct mlx90614_data *data = iio_priv(indio_dev); | |
313 | s32 ret; | |
314 | ||
315 | switch (mask) { | |
316 | case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/65535 / LSB */ | |
317 | if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0)) | |
318 | return -EINVAL; | |
f9ba1ab4 CM |
319 | val = val * MLX90614_CONST_RAW_EMISSIVITY_MAX + |
320 | val2 / MLX90614_CONST_EMISSIVITY_RESOLUTION; | |
fad65a8f | 321 | |
eb4b07da | 322 | mlx90614_power_get(data, false); |
fad65a8f VCSM |
323 | mutex_lock(&data->lock); |
324 | ret = mlx90614_write_word(data->client, MLX90614_EMISSIVITY, | |
325 | val); | |
326 | mutex_unlock(&data->lock); | |
eb4b07da | 327 | mlx90614_power_put(data); |
fad65a8f | 328 | |
764589b6 CM |
329 | return ret; |
330 | case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */ | |
331 | if (val < 0 || val2 < 0) | |
332 | return -EINVAL; | |
333 | ||
334 | mlx90614_power_get(data, false); | |
335 | mutex_lock(&data->lock); | |
336 | ret = mlx90614_iir_search(data->client, | |
337 | val * 100 + val2 / 10000); | |
338 | mutex_unlock(&data->lock); | |
339 | mlx90614_power_put(data); | |
340 | ||
f2c714a0 | 341 | return ret; |
fad65a8f VCSM |
342 | default: |
343 | return -EINVAL; | |
344 | } | |
345 | } | |
346 | ||
347 | static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev, | |
6069f47f | 348 | struct iio_chan_spec const *channel, |
fad65a8f VCSM |
349 | long mask) |
350 | { | |
351 | switch (mask) { | |
352 | case IIO_CHAN_INFO_CALIBEMISSIVITY: | |
353 | return IIO_VAL_INT_PLUS_NANO; | |
764589b6 CM |
354 | case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: |
355 | return IIO_VAL_INT_PLUS_MICRO; | |
474fe212 PM |
356 | default: |
357 | return -EINVAL; | |
358 | } | |
359 | } | |
360 | ||
361 | static const struct iio_chan_spec mlx90614_channels[] = { | |
362 | { | |
363 | .type = IIO_TEMP, | |
364 | .modified = 1, | |
365 | .channel2 = IIO_MOD_TEMP_AMBIENT, | |
366 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), | |
367 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | | |
368 | BIT(IIO_CHAN_INFO_SCALE), | |
369 | }, | |
370 | { | |
371 | .type = IIO_TEMP, | |
372 | .modified = 1, | |
373 | .channel2 = IIO_MOD_TEMP_OBJECT, | |
fad65a8f | 374 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
764589b6 CM |
375 | BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | |
376 | BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), | |
474fe212 PM |
377 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | |
378 | BIT(IIO_CHAN_INFO_SCALE), | |
379 | }, | |
bad4d1a0 VCSM |
380 | { |
381 | .type = IIO_TEMP, | |
382 | .indexed = 1, | |
383 | .modified = 1, | |
384 | .channel = 1, | |
385 | .channel2 = IIO_MOD_TEMP_OBJECT, | |
fad65a8f | 386 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
764589b6 CM |
387 | BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) | |
388 | BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), | |
bad4d1a0 VCSM |
389 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | |
390 | BIT(IIO_CHAN_INFO_SCALE), | |
391 | }, | |
474fe212 PM |
392 | }; |
393 | ||
394 | static const struct iio_info mlx90614_info = { | |
395 | .read_raw = mlx90614_read_raw, | |
fad65a8f VCSM |
396 | .write_raw = mlx90614_write_raw, |
397 | .write_raw_get_fmt = mlx90614_write_raw_get_fmt, | |
764589b6 | 398 | .attrs = &mlx90614_attr_group, |
474fe212 PM |
399 | }; |
400 | ||
eb4b07da VCSM |
401 | #ifdef CONFIG_PM |
402 | static int mlx90614_sleep(struct mlx90614_data *data) | |
403 | { | |
404 | s32 ret; | |
405 | ||
406 | if (!data->wakeup_gpio) { | |
407 | dev_dbg(&data->client->dev, "Sleep disabled"); | |
408 | return -ENOSYS; | |
409 | } | |
410 | ||
411 | dev_dbg(&data->client->dev, "Requesting sleep"); | |
412 | ||
413 | mutex_lock(&data->lock); | |
414 | ret = i2c_smbus_xfer(data->client->adapter, data->client->addr, | |
415 | data->client->flags | I2C_CLIENT_PEC, | |
416 | I2C_SMBUS_WRITE, MLX90614_OP_SLEEP, | |
417 | I2C_SMBUS_BYTE, NULL); | |
418 | mutex_unlock(&data->lock); | |
419 | ||
420 | return ret; | |
421 | } | |
422 | ||
423 | static int mlx90614_wakeup(struct mlx90614_data *data) | |
424 | { | |
425 | if (!data->wakeup_gpio) { | |
426 | dev_dbg(&data->client->dev, "Wake-up disabled"); | |
427 | return -ENOSYS; | |
428 | } | |
429 | ||
430 | dev_dbg(&data->client->dev, "Requesting wake-up"); | |
431 | ||
3f3a89e1 | 432 | i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER); |
eb4b07da VCSM |
433 | gpiod_direction_output(data->wakeup_gpio, 0); |
434 | msleep(MLX90614_TIMING_WAKEUP); | |
435 | gpiod_direction_input(data->wakeup_gpio); | |
3f3a89e1 | 436 | i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER); |
eb4b07da VCSM |
437 | |
438 | data->ready_timestamp = jiffies + | |
439 | msecs_to_jiffies(MLX90614_TIMING_STARTUP); | |
440 | ||
441 | /* | |
442 | * Quirk: the i2c controller may get confused right after the | |
443 | * wake-up signal has been sent. As a workaround, do a dummy read. | |
444 | * If the read fails, the controller will probably be reset so that | |
445 | * further reads will work. | |
446 | */ | |
447 | i2c_smbus_read_word_data(data->client, MLX90614_CONFIG); | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | /* Return wake-up GPIO or NULL if sleep functionality should be disabled. */ | |
453 | static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client) | |
454 | { | |
455 | struct gpio_desc *gpio; | |
456 | ||
457 | if (!i2c_check_functionality(client->adapter, | |
458 | I2C_FUNC_SMBUS_WRITE_BYTE)) { | |
459 | dev_info(&client->dev, | |
460 | "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled"); | |
461 | return NULL; | |
462 | } | |
463 | ||
464 | gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN); | |
465 | ||
466 | if (IS_ERR(gpio)) { | |
467 | dev_warn(&client->dev, | |
468 | "gpio acquisition failed with error %ld, sleep disabled", | |
469 | PTR_ERR(gpio)); | |
470 | return NULL; | |
471 | } else if (!gpio) { | |
472 | dev_info(&client->dev, | |
473 | "wakeup-gpio not found, sleep disabled"); | |
474 | } | |
475 | ||
476 | return gpio; | |
477 | } | |
478 | #else | |
479 | static inline int mlx90614_sleep(struct mlx90614_data *data) | |
480 | { | |
481 | return -ENOSYS; | |
482 | } | |
483 | static inline int mlx90614_wakeup(struct mlx90614_data *data) | |
484 | { | |
485 | return -ENOSYS; | |
486 | } | |
487 | static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client) | |
488 | { | |
489 | return NULL; | |
490 | } | |
491 | #endif | |
492 | ||
bad4d1a0 VCSM |
493 | /* Return 0 for single sensor, 1 for dual sensor, <0 on error. */ |
494 | static int mlx90614_probe_num_ir_sensors(struct i2c_client *client) | |
495 | { | |
496 | s32 ret; | |
497 | ||
498 | ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG); | |
499 | ||
500 | if (ret < 0) | |
501 | return ret; | |
502 | ||
503 | return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0; | |
504 | } | |
505 | ||
474fe212 PM |
506 | static int mlx90614_probe(struct i2c_client *client, |
507 | const struct i2c_device_id *id) | |
508 | { | |
509 | struct iio_dev *indio_dev; | |
510 | struct mlx90614_data *data; | |
bad4d1a0 | 511 | int ret; |
474fe212 PM |
512 | |
513 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) | |
f8d9d3b4 | 514 | return -EOPNOTSUPP; |
474fe212 PM |
515 | |
516 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
517 | if (!indio_dev) | |
518 | return -ENOMEM; | |
519 | ||
520 | data = iio_priv(indio_dev); | |
521 | i2c_set_clientdata(client, indio_dev); | |
522 | data->client = client; | |
fad65a8f | 523 | mutex_init(&data->lock); |
eb4b07da VCSM |
524 | data->wakeup_gpio = mlx90614_probe_wakeup(client); |
525 | ||
526 | mlx90614_wakeup(data); | |
474fe212 PM |
527 | |
528 | indio_dev->dev.parent = &client->dev; | |
529 | indio_dev->name = id->name; | |
530 | indio_dev->modes = INDIO_DIRECT_MODE; | |
531 | indio_dev->info = &mlx90614_info; | |
532 | ||
bad4d1a0 VCSM |
533 | ret = mlx90614_probe_num_ir_sensors(client); |
534 | switch (ret) { | |
535 | case 0: | |
536 | dev_dbg(&client->dev, "Found single sensor"); | |
537 | indio_dev->channels = mlx90614_channels; | |
538 | indio_dev->num_channels = 2; | |
539 | break; | |
540 | case 1: | |
541 | dev_dbg(&client->dev, "Found dual sensor"); | |
542 | indio_dev->channels = mlx90614_channels; | |
543 | indio_dev->num_channels = 3; | |
544 | break; | |
545 | default: | |
546 | return ret; | |
547 | } | |
474fe212 | 548 | |
eb4b07da VCSM |
549 | if (data->wakeup_gpio) { |
550 | pm_runtime_set_autosuspend_delay(&client->dev, | |
551 | MLX90614_AUTOSLEEP_DELAY); | |
552 | pm_runtime_use_autosuspend(&client->dev); | |
553 | pm_runtime_set_active(&client->dev); | |
554 | pm_runtime_enable(&client->dev); | |
555 | } | |
556 | ||
474fe212 PM |
557 | return iio_device_register(indio_dev); |
558 | } | |
559 | ||
560 | static int mlx90614_remove(struct i2c_client *client) | |
561 | { | |
eb4b07da VCSM |
562 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
563 | struct mlx90614_data *data = iio_priv(indio_dev); | |
564 | ||
565 | iio_device_unregister(indio_dev); | |
566 | ||
567 | if (data->wakeup_gpio) { | |
568 | pm_runtime_disable(&client->dev); | |
569 | if (!pm_runtime_status_suspended(&client->dev)) | |
570 | mlx90614_sleep(data); | |
571 | pm_runtime_set_suspended(&client->dev); | |
572 | } | |
474fe212 PM |
573 | |
574 | return 0; | |
575 | } | |
576 | ||
577 | static const struct i2c_device_id mlx90614_id[] = { | |
578 | { "mlx90614", 0 }, | |
579 | { } | |
580 | }; | |
581 | MODULE_DEVICE_TABLE(i2c, mlx90614_id); | |
582 | ||
58623b33 JMC |
583 | static const struct of_device_id mlx90614_of_match[] = { |
584 | { .compatible = "melexis,mlx90614" }, | |
585 | { } | |
586 | }; | |
587 | MODULE_DEVICE_TABLE(of, mlx90614_of_match); | |
588 | ||
eb4b07da VCSM |
589 | #ifdef CONFIG_PM_SLEEP |
590 | static int mlx90614_pm_suspend(struct device *dev) | |
591 | { | |
592 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
593 | struct mlx90614_data *data = iio_priv(indio_dev); | |
594 | ||
595 | if (data->wakeup_gpio && pm_runtime_active(dev)) | |
596 | return mlx90614_sleep(data); | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | static int mlx90614_pm_resume(struct device *dev) | |
602 | { | |
603 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
604 | struct mlx90614_data *data = iio_priv(indio_dev); | |
605 | int err; | |
606 | ||
607 | if (data->wakeup_gpio) { | |
608 | err = mlx90614_wakeup(data); | |
609 | if (err < 0) | |
610 | return err; | |
611 | ||
612 | pm_runtime_disable(dev); | |
613 | pm_runtime_set_active(dev); | |
614 | pm_runtime_enable(dev); | |
615 | } | |
616 | ||
617 | return 0; | |
618 | } | |
619 | #endif | |
620 | ||
621 | #ifdef CONFIG_PM | |
622 | static int mlx90614_pm_runtime_suspend(struct device *dev) | |
623 | { | |
624 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
625 | struct mlx90614_data *data = iio_priv(indio_dev); | |
626 | ||
627 | return mlx90614_sleep(data); | |
628 | } | |
629 | ||
630 | static int mlx90614_pm_runtime_resume(struct device *dev) | |
631 | { | |
632 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
633 | struct mlx90614_data *data = iio_priv(indio_dev); | |
634 | ||
635 | return mlx90614_wakeup(data); | |
636 | } | |
637 | #endif | |
638 | ||
639 | static const struct dev_pm_ops mlx90614_pm_ops = { | |
640 | SET_SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume) | |
641 | SET_RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend, | |
642 | mlx90614_pm_runtime_resume, NULL) | |
643 | }; | |
644 | ||
474fe212 PM |
645 | static struct i2c_driver mlx90614_driver = { |
646 | .driver = { | |
647 | .name = "mlx90614", | |
58623b33 | 648 | .of_match_table = mlx90614_of_match, |
eb4b07da | 649 | .pm = &mlx90614_pm_ops, |
474fe212 PM |
650 | }, |
651 | .probe = mlx90614_probe, | |
652 | .remove = mlx90614_remove, | |
653 | .id_table = mlx90614_id, | |
654 | }; | |
655 | module_i2c_driver(mlx90614_driver); | |
656 | ||
657 | MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); | |
bad4d1a0 | 658 | MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>"); |
764589b6 | 659 | MODULE_AUTHOR("Crt Mori <cmo@melexis.com>"); |
474fe212 PM |
660 | MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver"); |
661 | MODULE_LICENSE("GPL"); |