1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2021 Joe Sandom <joe.g.sandom@gmail.com> |
4 | * |
5 | * Datasheet: https://ams.com/tsl25911#tab/documents |
6 | * |
7 | * Device driver for the TAOS TSL2591. This is a very-high sensitivity |
8 | * light-to-digital converter that transforms light intensity into a digital |
9 | * signal. |
10 | */ |
11 | |
12 | #include <linux/bitfield.h> |
13 | #include <linux/debugfs.h> |
14 | #include <linux/delay.h> |
15 | #include <linux/i2c.h> |
16 | #include <linux/interrupt.h> |
17 | #include <linux/iopoll.h> |
18 | #include <linux/kernel.h> |
19 | #include <linux/module.h> |
20 | #include <linux/mutex.h> |
21 | #include <linux/pm_runtime.h> |
22 | #include <linux/sysfs.h> |
23 | |
24 | #include <asm/unaligned.h> |
25 | |
26 | #include <linux/iio/events.h> |
27 | #include <linux/iio/iio.h> |
28 | #include <linux/iio/sysfs.h> |
29 | |
30 | /* ADC integration time, field value to time in ms */ |
31 | #define TSL2591_FVAL_TO_MSEC(x) (((x) + 1) * 100) |
32 | /* ADC integration time, field value to time in seconds */ |
33 | #define TSL2591_FVAL_TO_SEC(x) ((x) + 1) |
34 | /* ADC integration time, time in seconds to field value */ |
35 | #define TSL2591_SEC_TO_FVAL(x) ((x) - 1) |
36 | |
37 | /* TSL2591 register set */ |
38 | #define TSL2591_ENABLE 0x00 |
39 | #define TSL2591_CONTROL 0x01 |
40 | #define TSL2591_AILTL 0x04 |
41 | #define TSL2591_AILTH 0x05 |
42 | #define TSL2591_AIHTL 0x06 |
43 | #define TSL2591_AIHTH 0x07 |
44 | #define TSL2591_NP_AILTL 0x08 |
45 | #define TSL2591_NP_AILTH 0x09 |
46 | #define TSL2591_NP_AIHTL 0x0A |
47 | #define TSL2591_NP_AIHTH 0x0B |
48 | #define TSL2591_PERSIST 0x0C |
49 | #define TSL2591_PACKAGE_ID 0x11 |
50 | #define TSL2591_DEVICE_ID 0x12 |
51 | #define TSL2591_STATUS 0x13 |
52 | #define TSL2591_C0_DATAL 0x14 |
53 | #define TSL2591_C0_DATAH 0x15 |
54 | #define TSL2591_C1_DATAL 0x16 |
55 | #define TSL2591_C1_DATAH 0x17 |
56 | |
57 | /* TSL2591 command register definitions */ |
58 | #define TSL2591_CMD_NOP 0xA0 |
59 | #define TSL2591_CMD_SF_INTSET 0xE4 |
60 | #define TSL2591_CMD_SF_CALS_I 0xE5 |
61 | #define TSL2591_CMD_SF_CALS_NPI 0xE7 |
62 | #define TSL2591_CMD_SF_CNP_ALSI 0xEA |
63 | |
64 | /* TSL2591 enable register definitions */ |
65 | #define TSL2591_PWR_ON 0x01 |
66 | #define TSL2591_PWR_OFF 0x00 |
67 | #define TSL2591_ENABLE_ALS 0x02 |
68 | #define TSL2591_ENABLE_ALS_INT 0x10 |
69 | #define TSL2591_ENABLE_SLEEP_INT 0x40 |
70 | #define TSL2591_ENABLE_NP_INT 0x80 |
71 | |
72 | /* TSL2591 control register definitions */ |
73 | #define TSL2591_CTRL_ALS_INTEGRATION_100MS 0x00 |
74 | #define TSL2591_CTRL_ALS_INTEGRATION_200MS 0x01 |
75 | #define TSL2591_CTRL_ALS_INTEGRATION_300MS 0x02 |
76 | #define TSL2591_CTRL_ALS_INTEGRATION_400MS 0x03 |
77 | #define TSL2591_CTRL_ALS_INTEGRATION_500MS 0x04 |
78 | #define TSL2591_CTRL_ALS_INTEGRATION_600MS 0x05 |
79 | #define TSL2591_CTRL_ALS_LOW_GAIN 0x00 |
80 | #define TSL2591_CTRL_ALS_MED_GAIN 0x10 |
81 | #define TSL2591_CTRL_ALS_HIGH_GAIN 0x20 |
82 | #define TSL2591_CTRL_ALS_MAX_GAIN 0x30 |
83 | #define TSL2591_CTRL_SYS_RESET 0x80 |
84 | |
85 | /* TSL2591 persist register definitions */ |
86 | #define TSL2591_PRST_ALS_INT_CYCLE_0 0x00 |
87 | #define TSL2591_PRST_ALS_INT_CYCLE_ANY 0x01 |
88 | #define TSL2591_PRST_ALS_INT_CYCLE_2 0x02 |
89 | #define TSL2591_PRST_ALS_INT_CYCLE_3 0x03 |
90 | #define TSL2591_PRST_ALS_INT_CYCLE_5 0x04 |
91 | #define TSL2591_PRST_ALS_INT_CYCLE_10 0x05 |
92 | #define TSL2591_PRST_ALS_INT_CYCLE_15 0x06 |
93 | #define TSL2591_PRST_ALS_INT_CYCLE_20 0x07 |
94 | #define TSL2591_PRST_ALS_INT_CYCLE_25 0x08 |
95 | #define TSL2591_PRST_ALS_INT_CYCLE_30 0x09 |
96 | #define TSL2591_PRST_ALS_INT_CYCLE_35 0x0A |
97 | #define TSL2591_PRST_ALS_INT_CYCLE_40 0x0B |
98 | #define TSL2591_PRST_ALS_INT_CYCLE_45 0x0C |
99 | #define TSL2591_PRST_ALS_INT_CYCLE_50 0x0D |
100 | #define TSL2591_PRST_ALS_INT_CYCLE_55 0x0E |
101 | #define TSL2591_PRST_ALS_INT_CYCLE_60 0x0F |
102 | #define TSL2591_PRST_ALS_INT_CYCLE_MAX (BIT(4) - 1) |
103 | |
104 | /* TSL2591 PID register mask */ |
105 | #define TSL2591_PACKAGE_ID_MASK GENMASK(5, 4) |
106 | |
107 | /* TSL2591 ID register mask */ |
108 | #define TSL2591_DEVICE_ID_MASK GENMASK(7, 0) |
109 | |
110 | /* TSL2591 status register masks */ |
111 | #define TSL2591_STS_ALS_VALID_MASK BIT(0) |
112 | #define TSL2591_STS_ALS_INT_MASK BIT(4) |
113 | #define TSL2591_STS_NPERS_INT_MASK BIT(5) |
114 | #define TSL2591_STS_VAL_HIGH_MASK BIT(0) |
115 | |
116 | /* TSL2591 constant values */ |
117 | #define TSL2591_PACKAGE_ID_VAL 0x00 |
118 | #define TSL2591_DEVICE_ID_VAL 0x50 |
119 | |
120 | /* Power off suspend delay time MS */ |
121 | #define TSL2591_POWER_OFF_DELAY_MS 2000 |
122 | |
123 | /* TSL2591 default values */ |
124 | #define TSL2591_DEFAULT_ALS_INT_TIME TSL2591_CTRL_ALS_INTEGRATION_300MS |
125 | #define TSL2591_DEFAULT_ALS_GAIN TSL2591_CTRL_ALS_MED_GAIN |
126 | #define TSL2591_DEFAULT_ALS_PERSIST TSL2591_PRST_ALS_INT_CYCLE_ANY |
127 | #define TSL2591_DEFAULT_ALS_LOWER_THRESH 100 |
128 | #define TSL2591_DEFAULT_ALS_UPPER_THRESH 1500 |
129 | |
130 | /* TSL2591 number of data registers */ |
131 | #define TSL2591_NUM_DATA_REGISTERS 4 |
132 | |
133 | /* TSL2591 number of valid status reads on ADC complete */ |
134 | #define TSL2591_ALS_STS_VALID_COUNT 10 |
135 | |
136 | /* TSL2591 delay period between polls when checking for ALS valid flag */ |
137 | #define TSL2591_DELAY_PERIOD_US 10000 |
138 | |
139 | /* TSL2591 maximum values */ |
140 | #define TSL2591_MAX_ALS_INT_TIME_MS 600 |
141 | #define TSL2591_ALS_MAX_VALUE (BIT(16) - 1) |
142 | |
143 | /* |
144 | * LUX calculations; |
145 | * AGAIN values from Adafruit's TSL2591 Arduino library |
146 | * https://github.com/adafruit/Adafruit_TSL2591_Library |
147 | */ |
148 | #define TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER 1 |
149 | #define TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER 25 |
150 | #define TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER 428 |
151 | #define TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER 9876 |
152 | #define TSL2591_LUX_COEFFICIENT 408 |
153 | |
154 | struct tsl2591_als_settings { |
155 | u16 als_lower_thresh; |
156 | u16 als_upper_thresh; |
157 | u8 als_int_time; |
158 | u8 als_persist; |
159 | u8 als_gain; |
160 | }; |
161 | |
162 | struct tsl2591_chip { |
163 | struct tsl2591_als_settings als_settings; |
164 | struct i2c_client *client; |
165 | /* |
166 | * Keep als_settings in sync with hardware state |
167 | * and ensure multiple readers are serialized. |
168 | */ |
169 | struct mutex als_mutex; |
170 | bool events_enabled; |
171 | }; |
172 | |
173 | /* |
174 | * Period table is ALS persist cycle x integration time setting |
175 | * Integration times: 100ms, 200ms, 300ms, 400ms, 500ms, 600ms |
176 | * ALS cycles: 1, 2, 3, 5, 10, 20, 25, 30, 35, 40, 45, 50, 55, 60 |
177 | */ |
178 | static const char * const tsl2591_als_period_list[] = { |
179 | "0.1 0.2 0.3 0.5 1.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0" , |
180 | "0.2 0.4 0.6 1.0 2.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0" , |
181 | "0.3 0.6 0.9 1.5 3.0 6.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0" , |
182 | "0.4 0.8 1.2 2.0 4.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0" , |
183 | "0.5 1.0 1.5 2.5 5.0 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0" , |
184 | "0.6 1.2 1.8 3.0 6.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 33.0 36.0" , |
185 | }; |
186 | |
187 | static const int tsl2591_int_time_available[] = { |
188 | 1, 2, 3, 4, 5, 6, |
189 | }; |
190 | |
191 | static const int tsl2591_calibscale_available[] = { |
192 | 1, 25, 428, 9876, |
193 | }; |
194 | |
195 | static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip, |
196 | u16 als_lower_threshold); |
197 | static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip, |
198 | u16 als_upper_threshold); |
199 | |
200 | static int tsl2591_gain_to_multiplier(const u8 als_gain) |
201 | { |
202 | switch (als_gain) { |
203 | case TSL2591_CTRL_ALS_LOW_GAIN: |
204 | return TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER; |
205 | case TSL2591_CTRL_ALS_MED_GAIN: |
206 | return TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER; |
207 | case TSL2591_CTRL_ALS_HIGH_GAIN: |
208 | return TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER; |
209 | case TSL2591_CTRL_ALS_MAX_GAIN: |
210 | return TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER; |
211 | default: |
212 | return -EINVAL; |
213 | } |
214 | } |
215 | |
216 | static int tsl2591_multiplier_to_gain(const u32 multiplier) |
217 | { |
218 | switch (multiplier) { |
219 | case TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER: |
220 | return TSL2591_CTRL_ALS_LOW_GAIN; |
221 | case TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER: |
222 | return TSL2591_CTRL_ALS_MED_GAIN; |
223 | case TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER: |
224 | return TSL2591_CTRL_ALS_HIGH_GAIN; |
225 | case TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER: |
226 | return TSL2591_CTRL_ALS_MAX_GAIN; |
227 | default: |
228 | return -EINVAL; |
229 | } |
230 | } |
231 | |
232 | static int tsl2591_persist_cycle_to_lit(const u8 als_persist) |
233 | { |
234 | switch (als_persist) { |
235 | case TSL2591_PRST_ALS_INT_CYCLE_ANY: |
236 | return 1; |
237 | case TSL2591_PRST_ALS_INT_CYCLE_2: |
238 | return 2; |
239 | case TSL2591_PRST_ALS_INT_CYCLE_3: |
240 | return 3; |
241 | case TSL2591_PRST_ALS_INT_CYCLE_5: |
242 | return 5; |
243 | case TSL2591_PRST_ALS_INT_CYCLE_10: |
244 | return 10; |
245 | case TSL2591_PRST_ALS_INT_CYCLE_15: |
246 | return 15; |
247 | case TSL2591_PRST_ALS_INT_CYCLE_20: |
248 | return 20; |
249 | case TSL2591_PRST_ALS_INT_CYCLE_25: |
250 | return 25; |
251 | case TSL2591_PRST_ALS_INT_CYCLE_30: |
252 | return 30; |
253 | case TSL2591_PRST_ALS_INT_CYCLE_35: |
254 | return 35; |
255 | case TSL2591_PRST_ALS_INT_CYCLE_40: |
256 | return 40; |
257 | case TSL2591_PRST_ALS_INT_CYCLE_45: |
258 | return 45; |
259 | case TSL2591_PRST_ALS_INT_CYCLE_50: |
260 | return 50; |
261 | case TSL2591_PRST_ALS_INT_CYCLE_55: |
262 | return 55; |
263 | case TSL2591_PRST_ALS_INT_CYCLE_60: |
264 | return 60; |
265 | default: |
266 | return -EINVAL; |
267 | } |
268 | } |
269 | |
270 | static int tsl2591_persist_lit_to_cycle(const u8 als_persist) |
271 | { |
272 | switch (als_persist) { |
273 | case 1: |
274 | return TSL2591_PRST_ALS_INT_CYCLE_ANY; |
275 | case 2: |
276 | return TSL2591_PRST_ALS_INT_CYCLE_2; |
277 | case 3: |
278 | return TSL2591_PRST_ALS_INT_CYCLE_3; |
279 | case 5: |
280 | return TSL2591_PRST_ALS_INT_CYCLE_5; |
281 | case 10: |
282 | return TSL2591_PRST_ALS_INT_CYCLE_10; |
283 | case 15: |
284 | return TSL2591_PRST_ALS_INT_CYCLE_15; |
285 | case 20: |
286 | return TSL2591_PRST_ALS_INT_CYCLE_20; |
287 | case 25: |
288 | return TSL2591_PRST_ALS_INT_CYCLE_25; |
289 | case 30: |
290 | return TSL2591_PRST_ALS_INT_CYCLE_30; |
291 | case 35: |
292 | return TSL2591_PRST_ALS_INT_CYCLE_35; |
293 | case 40: |
294 | return TSL2591_PRST_ALS_INT_CYCLE_40; |
295 | case 45: |
296 | return TSL2591_PRST_ALS_INT_CYCLE_45; |
297 | case 50: |
298 | return TSL2591_PRST_ALS_INT_CYCLE_50; |
299 | case 55: |
300 | return TSL2591_PRST_ALS_INT_CYCLE_55; |
301 | case 60: |
302 | return TSL2591_PRST_ALS_INT_CYCLE_60; |
303 | default: |
304 | return -EINVAL; |
305 | } |
306 | } |
307 | |
308 | static int tsl2591_compatible_int_time(struct tsl2591_chip *chip, |
309 | const u32 als_integration_time) |
310 | { |
311 | switch (als_integration_time) { |
312 | case TSL2591_CTRL_ALS_INTEGRATION_100MS: |
313 | case TSL2591_CTRL_ALS_INTEGRATION_200MS: |
314 | case TSL2591_CTRL_ALS_INTEGRATION_300MS: |
315 | case TSL2591_CTRL_ALS_INTEGRATION_400MS: |
316 | case TSL2591_CTRL_ALS_INTEGRATION_500MS: |
317 | case TSL2591_CTRL_ALS_INTEGRATION_600MS: |
318 | return 0; |
319 | default: |
320 | return -EINVAL; |
321 | } |
322 | } |
323 | |
324 | static int tsl2591_als_time_to_fval(const u32 als_integration_time) |
325 | { |
326 | int i; |
327 | |
328 | for (i = 0; i < ARRAY_SIZE(tsl2591_int_time_available); i++) { |
329 | if (als_integration_time == tsl2591_int_time_available[i]) |
330 | return TSL2591_SEC_TO_FVAL(als_integration_time); |
331 | } |
332 | |
333 | return -EINVAL; |
334 | } |
335 | |
336 | static int tsl2591_compatible_gain(struct tsl2591_chip *chip, const u8 als_gain) |
337 | { |
338 | switch (als_gain) { |
339 | case TSL2591_CTRL_ALS_LOW_GAIN: |
340 | case TSL2591_CTRL_ALS_MED_GAIN: |
341 | case TSL2591_CTRL_ALS_HIGH_GAIN: |
342 | case TSL2591_CTRL_ALS_MAX_GAIN: |
343 | return 0; |
344 | default: |
345 | return -EINVAL; |
346 | } |
347 | } |
348 | |
349 | static int tsl2591_compatible_als_persist_cycle(struct tsl2591_chip *chip, |
350 | const u32 als_persist) |
351 | { |
352 | switch (als_persist) { |
353 | case TSL2591_PRST_ALS_INT_CYCLE_ANY: |
354 | case TSL2591_PRST_ALS_INT_CYCLE_2: |
355 | case TSL2591_PRST_ALS_INT_CYCLE_3: |
356 | case TSL2591_PRST_ALS_INT_CYCLE_5: |
357 | case TSL2591_PRST_ALS_INT_CYCLE_10: |
358 | case TSL2591_PRST_ALS_INT_CYCLE_15: |
359 | case TSL2591_PRST_ALS_INT_CYCLE_20: |
360 | case TSL2591_PRST_ALS_INT_CYCLE_25: |
361 | case TSL2591_PRST_ALS_INT_CYCLE_30: |
362 | case TSL2591_PRST_ALS_INT_CYCLE_35: |
363 | case TSL2591_PRST_ALS_INT_CYCLE_40: |
364 | case TSL2591_PRST_ALS_INT_CYCLE_45: |
365 | case TSL2591_PRST_ALS_INT_CYCLE_50: |
366 | case TSL2591_PRST_ALS_INT_CYCLE_55: |
367 | case TSL2591_PRST_ALS_INT_CYCLE_60: |
368 | return 0; |
369 | default: |
370 | return -EINVAL; |
371 | } |
372 | } |
373 | |
374 | static int tsl2591_check_als_valid(struct i2c_client *client) |
375 | { |
376 | int ret; |
377 | |
378 | ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | TSL2591_STATUS); |
379 | if (ret < 0) { |
380 | dev_err(&client->dev, "Failed to read register\n" ); |
381 | return -EINVAL; |
382 | } |
383 | |
384 | return FIELD_GET(TSL2591_STS_ALS_VALID_MASK, ret); |
385 | } |
386 | |
387 | static int tsl2591_wait_adc_complete(struct tsl2591_chip *chip) |
388 | { |
389 | struct tsl2591_als_settings settings = chip->als_settings; |
390 | struct i2c_client *client = chip->client; |
391 | int delay; |
392 | int val; |
393 | int ret; |
394 | |
395 | delay = TSL2591_FVAL_TO_MSEC(settings.als_int_time); |
396 | if (!delay) |
397 | return -EINVAL; |
398 | |
399 | /* |
400 | * Sleep for ALS integration time to allow enough time or an ADC read |
401 | * cycle to complete. Check status after delay for ALS valid. |
402 | */ |
403 | msleep(msecs: delay); |
404 | |
405 | /* Check for status ALS valid flag for up to 100ms */ |
406 | ret = readx_poll_timeout(tsl2591_check_als_valid, client, |
407 | val, val == TSL2591_STS_VAL_HIGH_MASK, |
408 | TSL2591_DELAY_PERIOD_US, |
409 | TSL2591_DELAY_PERIOD_US * TSL2591_ALS_STS_VALID_COUNT); |
410 | if (ret) |
411 | dev_err(&client->dev, "Timed out waiting for valid ALS data\n" ); |
412 | |
413 | return ret; |
414 | } |
415 | |
416 | /* |
417 | * tsl2591_read_channel_data - Reads raw channel data and calculates lux |
418 | * |
419 | * Formula for lux calculation; |
420 | * Derived from Adafruit's TSL2591 library |
421 | * Link: https://github.com/adafruit/Adafruit_TSL2591_Library |
422 | * Counts Per Lux (CPL) = (ATIME_ms * AGAIN) / LUX DF |
423 | * lux = ((C0DATA - C1DATA) * (1 - (C1DATA / C0DATA))) / CPL |
424 | * |
425 | * Scale values to get more representative value of lux i.e. |
426 | * lux = ((C0DATA - C1DATA) * (1000 - ((C1DATA * 1000) / C0DATA))) / CPL |
427 | * |
428 | * Channel 0 = IR + Visible |
429 | * Channel 1 = IR only |
430 | */ |
431 | static int tsl2591_read_channel_data(struct iio_dev *indio_dev, |
432 | struct iio_chan_spec const *chan, |
433 | int *val, int *val2) |
434 | { |
435 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
436 | struct tsl2591_als_settings *settings = &chip->als_settings; |
437 | struct i2c_client *client = chip->client; |
438 | u8 als_data[TSL2591_NUM_DATA_REGISTERS]; |
439 | int counts_per_lux, int_time_fval, gain_multi, lux; |
440 | u16 als_ch0, als_ch1; |
441 | int ret; |
442 | |
443 | ret = tsl2591_wait_adc_complete(chip); |
444 | if (ret < 0) { |
445 | dev_err(&client->dev, "No data available. Err: %d\n" , ret); |
446 | return ret; |
447 | } |
448 | |
449 | ret = i2c_smbus_read_i2c_block_data(client, |
450 | TSL2591_CMD_NOP | TSL2591_C0_DATAL, |
451 | length: sizeof(als_data), values: als_data); |
452 | if (ret < 0) { |
453 | dev_err(&client->dev, "Failed to read data bytes" ); |
454 | return ret; |
455 | } |
456 | |
457 | als_ch0 = get_unaligned_le16(p: &als_data[0]); |
458 | als_ch1 = get_unaligned_le16(p: &als_data[2]); |
459 | |
460 | switch (chan->type) { |
461 | case IIO_INTENSITY: |
462 | if (chan->channel2 == IIO_MOD_LIGHT_BOTH) |
463 | *val = als_ch0; |
464 | else if (chan->channel2 == IIO_MOD_LIGHT_IR) |
465 | *val = als_ch1; |
466 | else |
467 | return -EINVAL; |
468 | break; |
469 | case IIO_LIGHT: |
470 | gain_multi = tsl2591_gain_to_multiplier(als_gain: settings->als_gain); |
471 | if (gain_multi < 0) { |
472 | dev_err(&client->dev, "Invalid multiplier" ); |
473 | return gain_multi; |
474 | } |
475 | |
476 | int_time_fval = TSL2591_FVAL_TO_MSEC(settings->als_int_time); |
477 | /* Calculate counts per lux value */ |
478 | counts_per_lux = (int_time_fval * gain_multi) / TSL2591_LUX_COEFFICIENT; |
479 | |
480 | dev_dbg(&client->dev, "Counts Per Lux: %d\n" , counts_per_lux); |
481 | |
482 | /* Calculate lux value */ |
483 | lux = ((als_ch0 - als_ch1) * |
484 | (1000 - ((als_ch1 * 1000) / als_ch0))) / counts_per_lux; |
485 | |
486 | dev_dbg(&client->dev, "Raw lux calculation: %d\n" , lux); |
487 | |
488 | /* Divide by 1000 to get real lux value before scaling */ |
489 | *val = lux / 1000; |
490 | |
491 | /* Get the decimal part of lux reading */ |
492 | *val2 = (lux - (*val * 1000)) * 1000; |
493 | |
494 | break; |
495 | default: |
496 | return -EINVAL; |
497 | } |
498 | |
499 | return 0; |
500 | } |
501 | |
502 | static int tsl2591_set_als_gain_int_time(struct tsl2591_chip *chip) |
503 | { |
504 | struct tsl2591_als_settings als_settings = chip->als_settings; |
505 | struct i2c_client *client = chip->client; |
506 | int ret; |
507 | |
508 | ret = i2c_smbus_write_byte_data(client, |
509 | TSL2591_CMD_NOP | TSL2591_CONTROL, |
510 | value: als_settings.als_int_time | als_settings.als_gain); |
511 | if (ret) |
512 | dev_err(&client->dev, "Failed to set als gain & int time\n" ); |
513 | |
514 | return ret; |
515 | } |
516 | |
517 | static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip, |
518 | u16 als_lower_threshold) |
519 | { |
520 | struct tsl2591_als_settings als_settings = chip->als_settings; |
521 | struct i2c_client *client = chip->client; |
522 | u16 als_upper_threshold; |
523 | u8 als_lower_l; |
524 | u8 als_lower_h; |
525 | int ret; |
526 | |
527 | chip->als_settings.als_lower_thresh = als_lower_threshold; |
528 | |
529 | /* |
530 | * Lower threshold should not be greater or equal to upper. |
531 | * If this is the case, then assert upper threshold to new lower |
532 | * threshold + 1 to avoid ordering issues when setting thresholds. |
533 | */ |
534 | if (als_lower_threshold >= als_settings.als_upper_thresh) { |
535 | als_upper_threshold = als_lower_threshold + 1; |
536 | tsl2591_set_als_upper_threshold(chip, als_upper_threshold); |
537 | } |
538 | |
539 | als_lower_l = als_lower_threshold; |
540 | als_lower_h = als_lower_threshold >> 8; |
541 | |
542 | ret = i2c_smbus_write_byte_data(client, |
543 | TSL2591_CMD_NOP | TSL2591_AILTL, |
544 | value: als_lower_l); |
545 | if (ret) { |
546 | dev_err(&client->dev, "Failed to set als lower threshold\n" ); |
547 | return ret; |
548 | } |
549 | |
550 | ret = i2c_smbus_write_byte_data(client, |
551 | TSL2591_CMD_NOP | TSL2591_AILTH, |
552 | value: als_lower_h); |
553 | if (ret) { |
554 | dev_err(&client->dev, "Failed to set als lower threshold\n" ); |
555 | return ret; |
556 | } |
557 | |
558 | return 0; |
559 | } |
560 | |
561 | static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip, |
562 | u16 als_upper_threshold) |
563 | { |
564 | struct tsl2591_als_settings als_settings = chip->als_settings; |
565 | struct i2c_client *client = chip->client; |
566 | u16 als_lower_threshold; |
567 | u8 als_upper_l; |
568 | u8 als_upper_h; |
569 | int ret; |
570 | |
571 | if (als_upper_threshold > TSL2591_ALS_MAX_VALUE) |
572 | return -EINVAL; |
573 | |
574 | chip->als_settings.als_upper_thresh = als_upper_threshold; |
575 | |
576 | /* |
577 | * Upper threshold should not be less than lower. If this |
578 | * is the case, then assert lower threshold to new upper |
579 | * threshold - 1 to avoid ordering issues when setting thresholds. |
580 | */ |
581 | if (als_upper_threshold < als_settings.als_lower_thresh) { |
582 | als_lower_threshold = als_upper_threshold - 1; |
583 | tsl2591_set_als_lower_threshold(chip, als_lower_threshold); |
584 | } |
585 | |
586 | als_upper_l = als_upper_threshold; |
587 | als_upper_h = als_upper_threshold >> 8; |
588 | |
589 | ret = i2c_smbus_write_byte_data(client, |
590 | TSL2591_CMD_NOP | TSL2591_AIHTL, |
591 | value: als_upper_l); |
592 | if (ret) { |
593 | dev_err(&client->dev, "Failed to set als upper threshold\n" ); |
594 | return ret; |
595 | } |
596 | |
597 | ret = i2c_smbus_write_byte_data(client, |
598 | TSL2591_CMD_NOP | TSL2591_AIHTH, |
599 | value: als_upper_h); |
600 | if (ret) { |
601 | dev_err(&client->dev, "Failed to set als upper threshold\n" ); |
602 | return ret; |
603 | } |
604 | |
605 | return 0; |
606 | } |
607 | |
608 | static int tsl2591_set_als_persist_cycle(struct tsl2591_chip *chip, |
609 | u8 als_persist) |
610 | { |
611 | struct i2c_client *client = chip->client; |
612 | int ret; |
613 | |
614 | ret = i2c_smbus_write_byte_data(client, |
615 | TSL2591_CMD_NOP | TSL2591_PERSIST, |
616 | value: als_persist); |
617 | if (ret) |
618 | dev_err(&client->dev, "Failed to set als persist cycle\n" ); |
619 | |
620 | chip->als_settings.als_persist = als_persist; |
621 | |
622 | return ret; |
623 | } |
624 | |
625 | static int tsl2591_set_power_state(struct tsl2591_chip *chip, u8 state) |
626 | { |
627 | struct i2c_client *client = chip->client; |
628 | int ret; |
629 | |
630 | ret = i2c_smbus_write_byte_data(client, |
631 | TSL2591_CMD_NOP | TSL2591_ENABLE, |
632 | value: state); |
633 | if (ret) |
634 | dev_err(&client->dev, |
635 | "Failed to set the power state to %#04x\n" , state); |
636 | |
637 | return ret; |
638 | } |
639 | |
640 | static ssize_t tsl2591_in_illuminance_period_available_show(struct device *dev, |
641 | struct device_attribute *attr, |
642 | char *buf) |
643 | { |
644 | struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
645 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
646 | |
647 | return sysfs_emit(buf, fmt: "%s\n" , |
648 | tsl2591_als_period_list[chip->als_settings.als_int_time]); |
649 | } |
650 | |
651 | static IIO_DEVICE_ATTR_RO(tsl2591_in_illuminance_period_available, 0); |
652 | |
653 | static struct attribute *tsl2591_event_attrs_ctrl[] = { |
654 | &iio_dev_attr_tsl2591_in_illuminance_period_available.dev_attr.attr, |
655 | NULL |
656 | }; |
657 | |
658 | static const struct attribute_group tsl2591_event_attribute_group = { |
659 | .attrs = tsl2591_event_attrs_ctrl, |
660 | }; |
661 | |
662 | static const struct iio_event_spec tsl2591_events[] = { |
663 | { |
664 | .type = IIO_EV_TYPE_THRESH, |
665 | .dir = IIO_EV_DIR_RISING, |
666 | .mask_separate = BIT(IIO_EV_INFO_VALUE), |
667 | }, { |
668 | .type = IIO_EV_TYPE_THRESH, |
669 | .dir = IIO_EV_DIR_FALLING, |
670 | .mask_separate = BIT(IIO_EV_INFO_VALUE), |
671 | }, { |
672 | .type = IIO_EV_TYPE_THRESH, |
673 | .dir = IIO_EV_DIR_EITHER, |
674 | .mask_separate = BIT(IIO_EV_INFO_PERIOD) | |
675 | BIT(IIO_EV_INFO_ENABLE), |
676 | }, |
677 | }; |
678 | |
679 | static const struct iio_chan_spec tsl2591_channels[] = { |
680 | { |
681 | .type = IIO_INTENSITY, |
682 | .modified = 1, |
683 | .channel2 = IIO_MOD_LIGHT_IR, |
684 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
685 | .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | |
686 | BIT(IIO_CHAN_INFO_CALIBSCALE), |
687 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | |
688 | BIT(IIO_CHAN_INFO_CALIBSCALE) |
689 | }, |
690 | { |
691 | .type = IIO_INTENSITY, |
692 | .modified = 1, |
693 | .channel2 = IIO_MOD_LIGHT_BOTH, |
694 | .event_spec = tsl2591_events, |
695 | .num_event_specs = ARRAY_SIZE(tsl2591_events), |
696 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
697 | .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | |
698 | BIT(IIO_CHAN_INFO_CALIBSCALE), |
699 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | |
700 | BIT(IIO_CHAN_INFO_CALIBSCALE) |
701 | }, |
702 | { |
703 | .type = IIO_LIGHT, |
704 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), |
705 | .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | |
706 | BIT(IIO_CHAN_INFO_CALIBSCALE), |
707 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | |
708 | BIT(IIO_CHAN_INFO_CALIBSCALE) |
709 | }, |
710 | }; |
711 | |
712 | static int tsl2591_read_raw(struct iio_dev *indio_dev, |
713 | struct iio_chan_spec const *chan, |
714 | int *val, int *val2, long mask) |
715 | { |
716 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
717 | struct i2c_client *client = chip->client; |
718 | int ret; |
719 | |
720 | pm_runtime_get_sync(dev: &client->dev); |
721 | |
722 | mutex_lock(&chip->als_mutex); |
723 | |
724 | switch (mask) { |
725 | case IIO_CHAN_INFO_RAW: |
726 | if (chan->type != IIO_INTENSITY) { |
727 | ret = -EINVAL; |
728 | goto err_unlock; |
729 | } |
730 | |
731 | ret = tsl2591_read_channel_data(indio_dev, chan, val, val2); |
732 | if (ret < 0) |
733 | goto err_unlock; |
734 | |
735 | ret = IIO_VAL_INT; |
736 | break; |
737 | case IIO_CHAN_INFO_PROCESSED: |
738 | if (chan->type != IIO_LIGHT) { |
739 | ret = -EINVAL; |
740 | goto err_unlock; |
741 | } |
742 | |
743 | ret = tsl2591_read_channel_data(indio_dev, chan, val, val2); |
744 | if (ret < 0) |
745 | break; |
746 | |
747 | ret = IIO_VAL_INT_PLUS_MICRO; |
748 | break; |
749 | case IIO_CHAN_INFO_INT_TIME: |
750 | if (chan->type != IIO_INTENSITY) { |
751 | ret = -EINVAL; |
752 | goto err_unlock; |
753 | } |
754 | |
755 | *val = TSL2591_FVAL_TO_SEC(chip->als_settings.als_int_time); |
756 | ret = IIO_VAL_INT; |
757 | break; |
758 | case IIO_CHAN_INFO_CALIBSCALE: |
759 | if (chan->type != IIO_INTENSITY) { |
760 | ret = -EINVAL; |
761 | goto err_unlock; |
762 | } |
763 | |
764 | *val = tsl2591_gain_to_multiplier(als_gain: chip->als_settings.als_gain); |
765 | ret = IIO_VAL_INT; |
766 | break; |
767 | default: |
768 | ret = -EINVAL; |
769 | break; |
770 | } |
771 | |
772 | err_unlock: |
773 | mutex_unlock(lock: &chip->als_mutex); |
774 | |
775 | pm_runtime_mark_last_busy(dev: &client->dev); |
776 | pm_runtime_put_autosuspend(dev: &client->dev); |
777 | |
778 | return ret; |
779 | } |
780 | |
781 | static int tsl2591_write_raw(struct iio_dev *indio_dev, |
782 | struct iio_chan_spec const *chan, |
783 | int val, int val2, long mask) |
784 | { |
785 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
786 | int int_time; |
787 | int gain; |
788 | int ret; |
789 | |
790 | mutex_lock(&chip->als_mutex); |
791 | |
792 | switch (mask) { |
793 | case IIO_CHAN_INFO_INT_TIME: |
794 | int_time = tsl2591_als_time_to_fval(als_integration_time: val); |
795 | if (int_time < 0) { |
796 | ret = int_time; |
797 | goto err_unlock; |
798 | } |
799 | ret = tsl2591_compatible_int_time(chip, als_integration_time: int_time); |
800 | if (ret < 0) |
801 | goto err_unlock; |
802 | |
803 | chip->als_settings.als_int_time = int_time; |
804 | break; |
805 | case IIO_CHAN_INFO_CALIBSCALE: |
806 | gain = tsl2591_multiplier_to_gain(multiplier: val); |
807 | if (gain < 0) { |
808 | ret = gain; |
809 | goto err_unlock; |
810 | } |
811 | ret = tsl2591_compatible_gain(chip, als_gain: gain); |
812 | if (ret < 0) |
813 | goto err_unlock; |
814 | |
815 | chip->als_settings.als_gain = gain; |
816 | break; |
817 | default: |
818 | ret = -EINVAL; |
819 | goto err_unlock; |
820 | } |
821 | |
822 | ret = tsl2591_set_als_gain_int_time(chip); |
823 | |
824 | err_unlock: |
825 | mutex_unlock(lock: &chip->als_mutex); |
826 | return ret; |
827 | } |
828 | |
829 | static int tsl2591_read_available(struct iio_dev *indio_dev, |
830 | struct iio_chan_spec const *chan, |
831 | const int **vals, int *type, int *length, |
832 | long mask) |
833 | { |
834 | switch (mask) { |
835 | case IIO_CHAN_INFO_INT_TIME: |
836 | *length = ARRAY_SIZE(tsl2591_int_time_available); |
837 | *vals = tsl2591_int_time_available; |
838 | *type = IIO_VAL_INT; |
839 | return IIO_AVAIL_LIST; |
840 | |
841 | case IIO_CHAN_INFO_CALIBSCALE: |
842 | *length = ARRAY_SIZE(tsl2591_calibscale_available); |
843 | *vals = tsl2591_calibscale_available; |
844 | *type = IIO_VAL_INT; |
845 | return IIO_AVAIL_LIST; |
846 | default: |
847 | return -EINVAL; |
848 | } |
849 | } |
850 | |
851 | static int tsl2591_read_event_value(struct iio_dev *indio_dev, |
852 | const struct iio_chan_spec *chan, |
853 | enum iio_event_type type, |
854 | enum iio_event_direction dir, |
855 | enum iio_event_info info, int *val, |
856 | int *val2) |
857 | { |
858 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
859 | struct i2c_client *client = chip->client; |
860 | int als_persist, int_time, period; |
861 | int ret; |
862 | |
863 | mutex_lock(&chip->als_mutex); |
864 | |
865 | switch (info) { |
866 | case IIO_EV_INFO_VALUE: |
867 | switch (dir) { |
868 | case IIO_EV_DIR_RISING: |
869 | *val = chip->als_settings.als_upper_thresh; |
870 | break; |
871 | case IIO_EV_DIR_FALLING: |
872 | *val = chip->als_settings.als_lower_thresh; |
873 | break; |
874 | default: |
875 | ret = -EINVAL; |
876 | goto err_unlock; |
877 | } |
878 | ret = IIO_VAL_INT; |
879 | break; |
880 | case IIO_EV_INFO_PERIOD: |
881 | ret = i2c_smbus_read_byte_data(client, |
882 | TSL2591_CMD_NOP | TSL2591_PERSIST); |
883 | if (ret <= 0 || ret > TSL2591_PRST_ALS_INT_CYCLE_MAX) |
884 | goto err_unlock; |
885 | |
886 | als_persist = tsl2591_persist_cycle_to_lit(als_persist: ret); |
887 | int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time); |
888 | period = als_persist * (int_time * MSEC_PER_SEC); |
889 | |
890 | *val = period / USEC_PER_SEC; |
891 | *val2 = period % USEC_PER_SEC; |
892 | |
893 | ret = IIO_VAL_INT_PLUS_MICRO; |
894 | break; |
895 | default: |
896 | ret = -EINVAL; |
897 | break; |
898 | } |
899 | |
900 | err_unlock: |
901 | mutex_unlock(lock: &chip->als_mutex); |
902 | return ret; |
903 | } |
904 | |
905 | static int tsl2591_write_event_value(struct iio_dev *indio_dev, |
906 | const struct iio_chan_spec *chan, |
907 | enum iio_event_type type, |
908 | enum iio_event_direction dir, |
909 | enum iio_event_info info, int val, |
910 | int val2) |
911 | { |
912 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
913 | int period, int_time, als_persist; |
914 | int ret; |
915 | |
916 | if (val < 0 || val2 < 0) |
917 | return -EINVAL; |
918 | |
919 | mutex_lock(&chip->als_mutex); |
920 | |
921 | switch (info) { |
922 | case IIO_EV_INFO_VALUE: |
923 | if (val > TSL2591_ALS_MAX_VALUE) { |
924 | ret = -EINVAL; |
925 | goto err_unlock; |
926 | } |
927 | |
928 | switch (dir) { |
929 | case IIO_EV_DIR_RISING: |
930 | ret = tsl2591_set_als_upper_threshold(chip, als_upper_threshold: val); |
931 | if (ret < 0) |
932 | goto err_unlock; |
933 | break; |
934 | case IIO_EV_DIR_FALLING: |
935 | ret = tsl2591_set_als_lower_threshold(chip, als_lower_threshold: val); |
936 | if (ret < 0) |
937 | goto err_unlock; |
938 | break; |
939 | default: |
940 | ret = -EINVAL; |
941 | goto err_unlock; |
942 | } |
943 | break; |
944 | case IIO_EV_INFO_PERIOD: |
945 | int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time); |
946 | |
947 | period = ((val * MSEC_PER_SEC) + |
948 | (val2 / MSEC_PER_SEC)) / int_time; |
949 | |
950 | als_persist = tsl2591_persist_lit_to_cycle(als_persist: period); |
951 | if (als_persist < 0) { |
952 | ret = -EINVAL; |
953 | goto err_unlock; |
954 | } |
955 | |
956 | ret = tsl2591_compatible_als_persist_cycle(chip, als_persist); |
957 | if (ret < 0) |
958 | goto err_unlock; |
959 | |
960 | ret = tsl2591_set_als_persist_cycle(chip, als_persist); |
961 | if (ret < 0) |
962 | goto err_unlock; |
963 | break; |
964 | default: |
965 | ret = -EINVAL; |
966 | break; |
967 | } |
968 | |
969 | err_unlock: |
970 | mutex_unlock(lock: &chip->als_mutex); |
971 | return ret; |
972 | } |
973 | |
974 | static int tsl2591_read_event_config(struct iio_dev *indio_dev, |
975 | const struct iio_chan_spec *chan, |
976 | enum iio_event_type type, |
977 | enum iio_event_direction dir) |
978 | { |
979 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
980 | |
981 | return chip->events_enabled; |
982 | } |
983 | |
984 | static int tsl2591_write_event_config(struct iio_dev *indio_dev, |
985 | const struct iio_chan_spec *chan, |
986 | enum iio_event_type type, |
987 | enum iio_event_direction dir, |
988 | int state) |
989 | { |
990 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
991 | struct i2c_client *client = chip->client; |
992 | |
993 | if (state && !chip->events_enabled) { |
994 | chip->events_enabled = true; |
995 | pm_runtime_get_sync(dev: &client->dev); |
996 | } else if (!state && chip->events_enabled) { |
997 | chip->events_enabled = false; |
998 | pm_runtime_mark_last_busy(dev: &client->dev); |
999 | pm_runtime_put_autosuspend(dev: &client->dev); |
1000 | } |
1001 | |
1002 | return 0; |
1003 | } |
1004 | |
1005 | static const struct iio_info tsl2591_info = { |
1006 | .event_attrs = &tsl2591_event_attribute_group, |
1007 | .read_raw = tsl2591_read_raw, |
1008 | .write_raw = tsl2591_write_raw, |
1009 | .read_avail = tsl2591_read_available, |
1010 | .read_event_value = tsl2591_read_event_value, |
1011 | .write_event_value = tsl2591_write_event_value, |
1012 | .read_event_config = tsl2591_read_event_config, |
1013 | .write_event_config = tsl2591_write_event_config, |
1014 | }; |
1015 | |
1016 | static const struct iio_info tsl2591_info_no_irq = { |
1017 | .read_raw = tsl2591_read_raw, |
1018 | .write_raw = tsl2591_write_raw, |
1019 | .read_avail = tsl2591_read_available, |
1020 | }; |
1021 | |
1022 | static int tsl2591_suspend(struct device *dev) |
1023 | { |
1024 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
1025 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
1026 | int ret; |
1027 | |
1028 | mutex_lock(&chip->als_mutex); |
1029 | ret = tsl2591_set_power_state(chip, TSL2591_PWR_OFF); |
1030 | mutex_unlock(lock: &chip->als_mutex); |
1031 | |
1032 | return ret; |
1033 | } |
1034 | |
1035 | static int tsl2591_resume(struct device *dev) |
1036 | { |
1037 | int power_state = TSL2591_PWR_ON | TSL2591_ENABLE_ALS; |
1038 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
1039 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
1040 | int ret; |
1041 | |
1042 | if (chip->events_enabled) |
1043 | power_state |= TSL2591_ENABLE_ALS_INT; |
1044 | |
1045 | mutex_lock(&chip->als_mutex); |
1046 | ret = tsl2591_set_power_state(chip, state: power_state); |
1047 | mutex_unlock(lock: &chip->als_mutex); |
1048 | |
1049 | return ret; |
1050 | } |
1051 | |
1052 | static DEFINE_RUNTIME_DEV_PM_OPS(tsl2591_pm_ops, tsl2591_suspend, |
1053 | tsl2591_resume, NULL); |
1054 | |
1055 | static irqreturn_t tsl2591_event_handler(int irq, void *private) |
1056 | { |
1057 | struct iio_dev *dev_info = private; |
1058 | struct tsl2591_chip *chip = iio_priv(indio_dev: dev_info); |
1059 | struct i2c_client *client = chip->client; |
1060 | |
1061 | if (!chip->events_enabled) |
1062 | return IRQ_NONE; |
1063 | |
1064 | iio_push_event(indio_dev: dev_info, |
1065 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, |
1066 | IIO_EV_TYPE_THRESH, |
1067 | IIO_EV_DIR_EITHER), |
1068 | timestamp: iio_get_time_ns(indio_dev: dev_info)); |
1069 | |
1070 | /* Clear ALS irq */ |
1071 | i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI); |
1072 | |
1073 | return IRQ_HANDLED; |
1074 | } |
1075 | |
1076 | static int tsl2591_load_defaults(struct tsl2591_chip *chip) |
1077 | { |
1078 | int ret; |
1079 | |
1080 | chip->als_settings.als_int_time = TSL2591_DEFAULT_ALS_INT_TIME; |
1081 | chip->als_settings.als_gain = TSL2591_DEFAULT_ALS_GAIN; |
1082 | chip->als_settings.als_lower_thresh = TSL2591_DEFAULT_ALS_LOWER_THRESH; |
1083 | chip->als_settings.als_upper_thresh = TSL2591_DEFAULT_ALS_UPPER_THRESH; |
1084 | |
1085 | ret = tsl2591_set_als_gain_int_time(chip); |
1086 | if (ret < 0) |
1087 | return ret; |
1088 | |
1089 | ret = tsl2591_set_als_persist_cycle(chip, TSL2591_DEFAULT_ALS_PERSIST); |
1090 | if (ret < 0) |
1091 | return ret; |
1092 | |
1093 | ret = tsl2591_set_als_lower_threshold(chip, TSL2591_DEFAULT_ALS_LOWER_THRESH); |
1094 | if (ret < 0) |
1095 | return ret; |
1096 | |
1097 | ret = tsl2591_set_als_upper_threshold(chip, TSL2591_DEFAULT_ALS_UPPER_THRESH); |
1098 | if (ret < 0) |
1099 | return ret; |
1100 | |
1101 | return 0; |
1102 | } |
1103 | |
1104 | static void tsl2591_chip_off(void *data) |
1105 | { |
1106 | struct iio_dev *indio_dev = data; |
1107 | struct tsl2591_chip *chip = iio_priv(indio_dev); |
1108 | struct i2c_client *client = chip->client; |
1109 | |
1110 | pm_runtime_disable(dev: &client->dev); |
1111 | pm_runtime_set_suspended(dev: &client->dev); |
1112 | pm_runtime_put_noidle(dev: &client->dev); |
1113 | |
1114 | tsl2591_set_power_state(chip, TSL2591_PWR_OFF); |
1115 | } |
1116 | |
1117 | static int tsl2591_probe(struct i2c_client *client) |
1118 | { |
1119 | struct tsl2591_chip *chip; |
1120 | struct iio_dev *indio_dev; |
1121 | int ret; |
1122 | |
1123 | if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { |
1124 | dev_err(&client->dev, |
1125 | "I2C smbus byte data functionality is not supported\n" ); |
1126 | return -EOPNOTSUPP; |
1127 | } |
1128 | |
1129 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: sizeof(*chip)); |
1130 | if (!indio_dev) |
1131 | return -ENOMEM; |
1132 | |
1133 | chip = iio_priv(indio_dev); |
1134 | chip->client = client; |
1135 | i2c_set_clientdata(client, data: indio_dev); |
1136 | |
1137 | if (client->irq) { |
1138 | ret = devm_request_threaded_irq(dev: &client->dev, irq: client->irq, |
1139 | NULL, thread_fn: tsl2591_event_handler, |
1140 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
1141 | devname: "tsl2591_irq" , dev_id: indio_dev); |
1142 | if (ret) { |
1143 | dev_err_probe(dev: &client->dev, err: ret, fmt: "IRQ request error\n" ); |
1144 | return -EINVAL; |
1145 | } |
1146 | indio_dev->info = &tsl2591_info; |
1147 | } else { |
1148 | indio_dev->info = &tsl2591_info_no_irq; |
1149 | } |
1150 | |
1151 | mutex_init(&chip->als_mutex); |
1152 | |
1153 | ret = i2c_smbus_read_byte_data(client, |
1154 | TSL2591_CMD_NOP | TSL2591_DEVICE_ID); |
1155 | if (ret < 0) { |
1156 | dev_err(&client->dev, |
1157 | "Failed to read the device ID register\n" ); |
1158 | return ret; |
1159 | } |
1160 | ret = FIELD_GET(TSL2591_DEVICE_ID_MASK, ret); |
1161 | if (ret != TSL2591_DEVICE_ID_VAL) { |
1162 | dev_err(&client->dev, "Device ID: %#04x unknown\n" , ret); |
1163 | return -EINVAL; |
1164 | } |
1165 | |
1166 | indio_dev->channels = tsl2591_channels; |
1167 | indio_dev->num_channels = ARRAY_SIZE(tsl2591_channels); |
1168 | indio_dev->modes = INDIO_DIRECT_MODE; |
1169 | indio_dev->name = chip->client->name; |
1170 | chip->events_enabled = false; |
1171 | |
1172 | pm_runtime_enable(dev: &client->dev); |
1173 | pm_runtime_set_autosuspend_delay(dev: &client->dev, |
1174 | TSL2591_POWER_OFF_DELAY_MS); |
1175 | pm_runtime_use_autosuspend(dev: &client->dev); |
1176 | |
1177 | /* |
1178 | * Add chip off to automatically managed path and disable runtime |
1179 | * power management. This ensures that the chip power management |
1180 | * is handled correctly on driver remove. tsl2591_chip_off() must be |
1181 | * added to the managed path after pm runtime is enabled and before |
1182 | * any error exit paths are met to ensure we're not left in a state |
1183 | * of pm runtime not being disabled properly. |
1184 | */ |
1185 | ret = devm_add_action_or_reset(&client->dev, tsl2591_chip_off, |
1186 | indio_dev); |
1187 | if (ret < 0) |
1188 | return -EINVAL; |
1189 | |
1190 | ret = tsl2591_load_defaults(chip); |
1191 | if (ret < 0) { |
1192 | dev_err(&client->dev, "Failed to load sensor defaults\n" ); |
1193 | return -EINVAL; |
1194 | } |
1195 | |
1196 | ret = i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI); |
1197 | if (ret < 0) { |
1198 | dev_err(&client->dev, "Failed to clear als irq\n" ); |
1199 | return -EINVAL; |
1200 | } |
1201 | |
1202 | return devm_iio_device_register(&client->dev, indio_dev); |
1203 | } |
1204 | |
1205 | static const struct of_device_id tsl2591_of_match[] = { |
1206 | { .compatible = "amstaos,tsl2591" }, |
1207 | {} |
1208 | }; |
1209 | MODULE_DEVICE_TABLE(of, tsl2591_of_match); |
1210 | |
1211 | static struct i2c_driver tsl2591_driver = { |
1212 | .driver = { |
1213 | .name = "tsl2591" , |
1214 | .pm = pm_ptr(&tsl2591_pm_ops), |
1215 | .of_match_table = tsl2591_of_match, |
1216 | }, |
1217 | .probe = tsl2591_probe |
1218 | }; |
1219 | module_i2c_driver(tsl2591_driver); |
1220 | |
1221 | MODULE_AUTHOR("Joe Sandom <joe.g.sandom@gmail.com>" ); |
1222 | MODULE_DESCRIPTION("TAOS tsl2591 ambient light sensor driver" ); |
1223 | MODULE_LICENSE("GPL" ); |
1224 | |