Commit | Line | Data |
---|---|---|
251eb40f JC |
1 | /* |
2 | * sht15.c - support for the SHT15 Temperature and Humidity Sensor | |
3 | * | |
edec5af7 | 4 | * Portions Copyright (c) 2010-2012 Savoir-faire Linux Inc. |
82c7465b | 5 | * Jerome Oufella <jerome.oufella@savoirfairelinux.com> |
cc15c7eb VD |
6 | * Vivien Didelot <vivien.didelot@savoirfairelinux.com> |
7 | * | |
251eb40f JC |
8 | * Copyright (c) 2009 Jonathan Cameron |
9 | * | |
10 | * Copyright (c) 2007 Wouter Horre | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
99a0378d | 16 | * For further information, see the Documentation/hwmon/sht15 file. |
251eb40f JC |
17 | */ |
18 | ||
19 | #include <linux/interrupt.h> | |
20 | #include <linux/irq.h> | |
21 | #include <linux/gpio.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/hwmon.h> | |
25 | #include <linux/hwmon-sysfs.h> | |
26 | #include <linux/mutex.h> | |
f9b693eb | 27 | #include <linux/platform_data/sht15.h> |
251eb40f | 28 | #include <linux/platform_device.h> |
d43c36dc | 29 | #include <linux/sched.h> |
251eb40f JC |
30 | #include <linux/delay.h> |
31 | #include <linux/jiffies.h> | |
32 | #include <linux/err.h> | |
251eb40f | 33 | #include <linux/regulator/consumer.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
60063497 | 35 | #include <linux/atomic.h> |
251eb40f | 36 | |
99a0378d VD |
37 | /* Commands */ |
38 | #define SHT15_MEASURE_TEMP 0x03 | |
39 | #define SHT15_MEASURE_RH 0x05 | |
cc15c7eb VD |
40 | #define SHT15_WRITE_STATUS 0x06 |
41 | #define SHT15_READ_STATUS 0x07 | |
181148ae | 42 | #define SHT15_SOFT_RESET 0x1E |
251eb40f | 43 | |
99a0378d VD |
44 | /* Min timings */ |
45 | #define SHT15_TSCKL 100 /* (nsecs) clock low */ | |
46 | #define SHT15_TSCKH 100 /* (nsecs) clock high */ | |
47 | #define SHT15_TSU 150 /* (nsecs) data setup time */ | |
181148ae | 48 | #define SHT15_TSRST 11 /* (msecs) soft reset time */ |
251eb40f | 49 | |
cc15c7eb VD |
50 | /* Status Register Bits */ |
51 | #define SHT15_STATUS_LOW_RESOLUTION 0x01 | |
52 | #define SHT15_STATUS_NO_OTP_RELOAD 0x02 | |
53 | #define SHT15_STATUS_HEATER 0x04 | |
54 | #define SHT15_STATUS_LOW_BATTERY 0x40 | |
55 | ||
edec5af7 VD |
56 | /* List of supported chips */ |
57 | enum sht15_chips { sht10, sht11, sht15, sht71, sht75 }; | |
58 | ||
99a0378d VD |
59 | /* Actions the driver may be doing */ |
60 | enum sht15_state { | |
61 | SHT15_READING_NOTHING, | |
62 | SHT15_READING_TEMP, | |
63 | SHT15_READING_HUMID | |
64 | }; | |
251eb40f JC |
65 | |
66 | /** | |
25985edc | 67 | * struct sht15_temppair - elements of voltage dependent temp calc |
251eb40f JC |
68 | * @vdd: supply voltage in microvolts |
69 | * @d1: see data sheet | |
70 | */ | |
71 | struct sht15_temppair { | |
72 | int vdd; /* microvolts */ | |
73 | int d1; | |
74 | }; | |
75 | ||
99a0378d | 76 | /* Table 9 from datasheet - relates temperature calculation to supply voltage */ |
251eb40f JC |
77 | static const struct sht15_temppair temppoints[] = { |
78 | { 2500000, -39400 }, | |
79 | { 3000000, -39600 }, | |
80 | { 3500000, -39700 }, | |
81 | { 4000000, -39800 }, | |
82 | { 5000000, -40100 }, | |
83 | }; | |
84 | ||
82c7465b JO |
85 | /* Table from CRC datasheet, section 2.4 */ |
86 | static const u8 sht15_crc8_table[] = { | |
87 | 0, 49, 98, 83, 196, 245, 166, 151, | |
88 | 185, 136, 219, 234, 125, 76, 31, 46, | |
89 | 67, 114, 33, 16, 135, 182, 229, 212, | |
90 | 250, 203, 152, 169, 62, 15, 92, 109, | |
91 | 134, 183, 228, 213, 66, 115, 32, 17, | |
92 | 63, 14, 93, 108, 251, 202, 153, 168, | |
93 | 197, 244, 167, 150, 1, 48, 99, 82, | |
94 | 124, 77, 30, 47, 184, 137, 218, 235, | |
95 | 61, 12, 95, 110, 249, 200, 155, 170, | |
96 | 132, 181, 230, 215, 64, 113, 34, 19, | |
97 | 126, 79, 28, 45, 186, 139, 216, 233, | |
98 | 199, 246, 165, 148, 3, 50, 97, 80, | |
99 | 187, 138, 217, 232, 127, 78, 29, 44, | |
100 | 2, 51, 96, 81, 198, 247, 164, 149, | |
101 | 248, 201, 154, 171, 60, 13, 94, 111, | |
102 | 65, 112, 35, 18, 133, 180, 231, 214, | |
103 | 122, 75, 24, 41, 190, 143, 220, 237, | |
104 | 195, 242, 161, 144, 7, 54, 101, 84, | |
105 | 57, 8, 91, 106, 253, 204, 159, 174, | |
106 | 128, 177, 226, 211, 68, 117, 38, 23, | |
107 | 252, 205, 158, 175, 56, 9, 90, 107, | |
108 | 69, 116, 39, 22, 129, 176, 227, 210, | |
109 | 191, 142, 221, 236, 123, 74, 25, 40, | |
110 | 6, 55, 100, 85, 194, 243, 160, 145, | |
111 | 71, 118, 37, 20, 131, 178, 225, 208, | |
112 | 254, 207, 156, 173, 58, 11, 88, 105, | |
113 | 4, 53, 102, 87, 192, 241, 162, 147, | |
114 | 189, 140, 223, 238, 121, 72, 27, 42, | |
115 | 193, 240, 163, 146, 5, 52, 103, 86, | |
116 | 120, 73, 26, 43, 188, 141, 222, 239, | |
117 | 130, 179, 224, 209, 70, 119, 36, 21, | |
118 | 59, 10, 89, 104, 255, 206, 157, 172 | |
119 | }; | |
120 | ||
251eb40f JC |
121 | /** |
122 | * struct sht15_data - device instance specific data | |
99a0378d VD |
123 | * @pdata: platform data (gpio's etc). |
124 | * @read_work: bh of interrupt handler. | |
125 | * @wait_queue: wait queue for getting values from device. | |
126 | * @val_temp: last temperature value read from device. | |
127 | * @val_humid: last humidity value read from device. | |
cc15c7eb | 128 | * @val_status: last status register value read from device. |
82c7465b JO |
129 | * @checksum_ok: last value read from the device passed CRC validation. |
130 | * @checksumming: flag used to enable the data validation with CRC. | |
99a0378d VD |
131 | * @state: state identifying the action the driver is doing. |
132 | * @measurements_valid: are the current stored measures valid (start condition). | |
cc15c7eb | 133 | * @status_valid: is the current stored status valid (start condition). |
99a0378d | 134 | * @last_measurement: time of last measure. |
cc15c7eb | 135 | * @last_status: time of last status reading. |
99a0378d VD |
136 | * @read_lock: mutex to ensure only one read in progress at a time. |
137 | * @dev: associate device structure. | |
138 | * @hwmon_dev: device associated with hwmon subsystem. | |
139 | * @reg: associated regulator (if specified). | |
140 | * @nb: notifier block to handle notifications of voltage | |
141 | * changes. | |
142 | * @supply_uV: local copy of supply voltage used to allow use of | |
143 | * regulator consumer if available. | |
144 | * @supply_uV_valid: indicates that an updated value has not yet been | |
145 | * obtained from the regulator and so any calculations | |
146 | * based upon it will be invalid. | |
147 | * @update_supply_work: work struct that is used to update the supply_uV. | |
148 | * @interrupt_handled: flag used to indicate a handler has been scheduled. | |
251eb40f JC |
149 | */ |
150 | struct sht15_data { | |
151 | struct sht15_platform_data *pdata; | |
152 | struct work_struct read_work; | |
153 | wait_queue_head_t wait_queue; | |
154 | uint16_t val_temp; | |
155 | uint16_t val_humid; | |
cc15c7eb | 156 | u8 val_status; |
82c7465b JO |
157 | bool checksum_ok; |
158 | bool checksumming; | |
99a0378d VD |
159 | enum sht15_state state; |
160 | bool measurements_valid; | |
cc15c7eb | 161 | bool status_valid; |
99a0378d | 162 | unsigned long last_measurement; |
cc15c7eb | 163 | unsigned long last_status; |
251eb40f JC |
164 | struct mutex read_lock; |
165 | struct device *dev; | |
166 | struct device *hwmon_dev; | |
167 | struct regulator *reg; | |
168 | struct notifier_block nb; | |
169 | int supply_uV; | |
99a0378d | 170 | bool supply_uV_valid; |
251eb40f JC |
171 | struct work_struct update_supply_work; |
172 | atomic_t interrupt_handled; | |
173 | }; | |
174 | ||
82c7465b JO |
175 | /** |
176 | * sht15_reverse() - reverse a byte | |
177 | * @byte: byte to reverse. | |
178 | */ | |
179 | static u8 sht15_reverse(u8 byte) | |
180 | { | |
181 | u8 i, c; | |
182 | ||
183 | for (c = 0, i = 0; i < 8; i++) | |
184 | c |= (!!(byte & (1 << i))) << (7 - i); | |
185 | return c; | |
186 | } | |
187 | ||
188 | /** | |
189 | * sht15_crc8() - compute crc8 | |
190 | * @data: sht15 specific data. | |
191 | * @value: sht15 retrieved data. | |
192 | * | |
193 | * This implements section 2 of the CRC datasheet. | |
194 | */ | |
195 | static u8 sht15_crc8(struct sht15_data *data, | |
196 | const u8 *value, | |
197 | int len) | |
198 | { | |
199 | u8 crc = sht15_reverse(data->val_status & 0x0F); | |
200 | ||
201 | while (len--) { | |
202 | crc = sht15_crc8_table[*value ^ crc]; | |
203 | value++; | |
204 | } | |
205 | ||
206 | return crc; | |
207 | } | |
208 | ||
251eb40f JC |
209 | /** |
210 | * sht15_connection_reset() - reset the comms interface | |
211 | * @data: sht15 specific data | |
212 | * | |
213 | * This implements section 3.4 of the data sheet | |
214 | */ | |
215 | static void sht15_connection_reset(struct sht15_data *data) | |
216 | { | |
217 | int i; | |
99a0378d | 218 | |
251eb40f JC |
219 | gpio_direction_output(data->pdata->gpio_data, 1); |
220 | ndelay(SHT15_TSCKL); | |
221 | gpio_set_value(data->pdata->gpio_sck, 0); | |
222 | ndelay(SHT15_TSCKL); | |
223 | for (i = 0; i < 9; ++i) { | |
224 | gpio_set_value(data->pdata->gpio_sck, 1); | |
225 | ndelay(SHT15_TSCKH); | |
226 | gpio_set_value(data->pdata->gpio_sck, 0); | |
227 | ndelay(SHT15_TSCKL); | |
228 | } | |
229 | } | |
99a0378d | 230 | |
251eb40f JC |
231 | /** |
232 | * sht15_send_bit() - send an individual bit to the device | |
233 | * @data: device state data | |
234 | * @val: value of bit to be sent | |
99a0378d | 235 | */ |
251eb40f JC |
236 | static inline void sht15_send_bit(struct sht15_data *data, int val) |
237 | { | |
251eb40f JC |
238 | gpio_set_value(data->pdata->gpio_data, val); |
239 | ndelay(SHT15_TSU); | |
240 | gpio_set_value(data->pdata->gpio_sck, 1); | |
241 | ndelay(SHT15_TSCKH); | |
242 | gpio_set_value(data->pdata->gpio_sck, 0); | |
243 | ndelay(SHT15_TSCKL); /* clock low time */ | |
244 | } | |
245 | ||
246 | /** | |
247 | * sht15_transmission_start() - specific sequence for new transmission | |
251eb40f | 248 | * @data: device state data |
99a0378d | 249 | * |
251eb40f JC |
250 | * Timings for this are not documented on the data sheet, so very |
251 | * conservative ones used in implementation. This implements | |
252 | * figure 12 on the data sheet. | |
99a0378d | 253 | */ |
251eb40f JC |
254 | static void sht15_transmission_start(struct sht15_data *data) |
255 | { | |
256 | /* ensure data is high and output */ | |
257 | gpio_direction_output(data->pdata->gpio_data, 1); | |
258 | ndelay(SHT15_TSU); | |
259 | gpio_set_value(data->pdata->gpio_sck, 0); | |
260 | ndelay(SHT15_TSCKL); | |
261 | gpio_set_value(data->pdata->gpio_sck, 1); | |
262 | ndelay(SHT15_TSCKH); | |
263 | gpio_set_value(data->pdata->gpio_data, 0); | |
264 | ndelay(SHT15_TSU); | |
265 | gpio_set_value(data->pdata->gpio_sck, 0); | |
266 | ndelay(SHT15_TSCKL); | |
267 | gpio_set_value(data->pdata->gpio_sck, 1); | |
268 | ndelay(SHT15_TSCKH); | |
269 | gpio_set_value(data->pdata->gpio_data, 1); | |
270 | ndelay(SHT15_TSU); | |
271 | gpio_set_value(data->pdata->gpio_sck, 0); | |
272 | ndelay(SHT15_TSCKL); | |
273 | } | |
99a0378d | 274 | |
251eb40f JC |
275 | /** |
276 | * sht15_send_byte() - send a single byte to the device | |
277 | * @data: device state | |
278 | * @byte: value to be sent | |
99a0378d | 279 | */ |
251eb40f JC |
280 | static void sht15_send_byte(struct sht15_data *data, u8 byte) |
281 | { | |
282 | int i; | |
99a0378d | 283 | |
251eb40f JC |
284 | for (i = 0; i < 8; i++) { |
285 | sht15_send_bit(data, !!(byte & 0x80)); | |
286 | byte <<= 1; | |
287 | } | |
288 | } | |
99a0378d | 289 | |
251eb40f JC |
290 | /** |
291 | * sht15_wait_for_response() - checks for ack from device | |
292 | * @data: device state | |
99a0378d | 293 | */ |
251eb40f JC |
294 | static int sht15_wait_for_response(struct sht15_data *data) |
295 | { | |
296 | gpio_direction_input(data->pdata->gpio_data); | |
297 | gpio_set_value(data->pdata->gpio_sck, 1); | |
298 | ndelay(SHT15_TSCKH); | |
299 | if (gpio_get_value(data->pdata->gpio_data)) { | |
300 | gpio_set_value(data->pdata->gpio_sck, 0); | |
301 | dev_err(data->dev, "Command not acknowledged\n"); | |
302 | sht15_connection_reset(data); | |
303 | return -EIO; | |
304 | } | |
305 | gpio_set_value(data->pdata->gpio_sck, 0); | |
306 | ndelay(SHT15_TSCKL); | |
307 | return 0; | |
308 | } | |
309 | ||
310 | /** | |
311 | * sht15_send_cmd() - Sends a command to the device. | |
312 | * @data: device state | |
313 | * @cmd: command byte to be sent | |
314 | * | |
315 | * On entry, sck is output low, data is output pull high | |
316 | * and the interrupt disabled. | |
99a0378d | 317 | */ |
251eb40f JC |
318 | static int sht15_send_cmd(struct sht15_data *data, u8 cmd) |
319 | { | |
320 | int ret = 0; | |
99a0378d | 321 | |
251eb40f JC |
322 | sht15_transmission_start(data); |
323 | sht15_send_byte(data, cmd); | |
324 | ret = sht15_wait_for_response(data); | |
325 | return ret; | |
326 | } | |
99a0378d | 327 | |
181148ae VD |
328 | /** |
329 | * sht15_soft_reset() - send a soft reset command | |
330 | * @data: sht15 specific data. | |
331 | * | |
332 | * As described in section 3.2 of the datasheet. | |
333 | */ | |
334 | static int sht15_soft_reset(struct sht15_data *data) | |
335 | { | |
336 | int ret; | |
337 | ||
338 | ret = sht15_send_cmd(data, SHT15_SOFT_RESET); | |
339 | if (ret) | |
340 | return ret; | |
341 | msleep(SHT15_TSRST); | |
cc15c7eb VD |
342 | /* device resets default hardware status register value */ |
343 | data->val_status = 0; | |
344 | ||
345 | return ret; | |
346 | } | |
347 | ||
82c7465b JO |
348 | /** |
349 | * sht15_ack() - send a ack | |
350 | * @data: sht15 specific data. | |
351 | * | |
352 | * Each byte of data is acknowledged by pulling the data line | |
353 | * low for one clock pulse. | |
354 | */ | |
355 | static void sht15_ack(struct sht15_data *data) | |
356 | { | |
357 | gpio_direction_output(data->pdata->gpio_data, 0); | |
358 | ndelay(SHT15_TSU); | |
359 | gpio_set_value(data->pdata->gpio_sck, 1); | |
360 | ndelay(SHT15_TSU); | |
361 | gpio_set_value(data->pdata->gpio_sck, 0); | |
362 | ndelay(SHT15_TSU); | |
363 | gpio_set_value(data->pdata->gpio_data, 1); | |
364 | ||
365 | gpio_direction_input(data->pdata->gpio_data); | |
366 | } | |
367 | ||
cc15c7eb VD |
368 | /** |
369 | * sht15_end_transmission() - notify device of end of transmission | |
370 | * @data: device state. | |
371 | * | |
372 | * This is basically a NAK (single clock pulse, data high). | |
373 | */ | |
374 | static void sht15_end_transmission(struct sht15_data *data) | |
375 | { | |
376 | gpio_direction_output(data->pdata->gpio_data, 1); | |
377 | ndelay(SHT15_TSU); | |
378 | gpio_set_value(data->pdata->gpio_sck, 1); | |
379 | ndelay(SHT15_TSCKH); | |
380 | gpio_set_value(data->pdata->gpio_sck, 0); | |
381 | ndelay(SHT15_TSCKL); | |
382 | } | |
383 | ||
384 | /** | |
385 | * sht15_read_byte() - Read a byte back from the device | |
386 | * @data: device state. | |
387 | */ | |
388 | static u8 sht15_read_byte(struct sht15_data *data) | |
389 | { | |
390 | int i; | |
391 | u8 byte = 0; | |
392 | ||
393 | for (i = 0; i < 8; ++i) { | |
394 | byte <<= 1; | |
395 | gpio_set_value(data->pdata->gpio_sck, 1); | |
396 | ndelay(SHT15_TSCKH); | |
397 | byte |= !!gpio_get_value(data->pdata->gpio_data); | |
398 | gpio_set_value(data->pdata->gpio_sck, 0); | |
399 | ndelay(SHT15_TSCKL); | |
400 | } | |
401 | return byte; | |
402 | } | |
403 | ||
404 | /** | |
405 | * sht15_send_status() - write the status register byte | |
406 | * @data: sht15 specific data. | |
407 | * @status: the byte to set the status register with. | |
408 | * | |
409 | * As described in figure 14 and table 5 of the datasheet. | |
410 | */ | |
411 | static int sht15_send_status(struct sht15_data *data, u8 status) | |
412 | { | |
413 | int ret; | |
414 | ||
415 | ret = sht15_send_cmd(data, SHT15_WRITE_STATUS); | |
416 | if (ret) | |
417 | return ret; | |
418 | gpio_direction_output(data->pdata->gpio_data, 1); | |
419 | ndelay(SHT15_TSU); | |
420 | sht15_send_byte(data, status); | |
421 | ret = sht15_wait_for_response(data); | |
422 | if (ret) | |
423 | return ret; | |
181148ae | 424 | |
cc15c7eb | 425 | data->val_status = status; |
181148ae VD |
426 | return 0; |
427 | } | |
428 | ||
cc15c7eb VD |
429 | /** |
430 | * sht15_update_status() - get updated status register from device if too old | |
431 | * @data: device instance specific data. | |
432 | * | |
433 | * As described in figure 15 and table 5 of the datasheet. | |
434 | */ | |
435 | static int sht15_update_status(struct sht15_data *data) | |
436 | { | |
437 | int ret = 0; | |
438 | u8 status; | |
82c7465b JO |
439 | u8 previous_config; |
440 | u8 dev_checksum = 0; | |
441 | u8 checksum_vals[2]; | |
cc15c7eb VD |
442 | int timeout = HZ; |
443 | ||
444 | mutex_lock(&data->read_lock); | |
445 | if (time_after(jiffies, data->last_status + timeout) | |
446 | || !data->status_valid) { | |
447 | ret = sht15_send_cmd(data, SHT15_READ_STATUS); | |
448 | if (ret) | |
449 | goto error_ret; | |
450 | status = sht15_read_byte(data); | |
451 | ||
82c7465b JO |
452 | if (data->checksumming) { |
453 | sht15_ack(data); | |
454 | dev_checksum = sht15_reverse(sht15_read_byte(data)); | |
455 | checksum_vals[0] = SHT15_READ_STATUS; | |
456 | checksum_vals[1] = status; | |
457 | data->checksum_ok = (sht15_crc8(data, checksum_vals, 2) | |
458 | == dev_checksum); | |
459 | } | |
460 | ||
cc15c7eb VD |
461 | sht15_end_transmission(data); |
462 | ||
82c7465b JO |
463 | /* |
464 | * Perform checksum validation on the received data. | |
465 | * Specification mentions that in case a checksum verification | |
466 | * fails, a soft reset command must be sent to the device. | |
467 | */ | |
468 | if (data->checksumming && !data->checksum_ok) { | |
469 | previous_config = data->val_status & 0x07; | |
470 | ret = sht15_soft_reset(data); | |
471 | if (ret) | |
472 | goto error_ret; | |
473 | if (previous_config) { | |
474 | ret = sht15_send_status(data, previous_config); | |
475 | if (ret) { | |
476 | dev_err(data->dev, | |
477 | "CRC validation failed, unable " | |
478 | "to restore device settings\n"); | |
479 | goto error_ret; | |
480 | } | |
481 | } | |
482 | ret = -EAGAIN; | |
483 | goto error_ret; | |
484 | } | |
485 | ||
cc15c7eb VD |
486 | data->val_status = status; |
487 | data->status_valid = true; | |
488 | data->last_status = jiffies; | |
489 | } | |
490 | error_ret: | |
491 | mutex_unlock(&data->read_lock); | |
492 | ||
493 | return ret; | |
494 | } | |
495 | ||
251eb40f | 496 | /** |
99a0378d | 497 | * sht15_measurement() - get a new value from device |
251eb40f JC |
498 | * @data: device instance specific data |
499 | * @command: command sent to request value | |
500 | * @timeout_msecs: timeout after which comms are assumed | |
501 | * to have failed are reset. | |
99a0378d VD |
502 | */ |
503 | static int sht15_measurement(struct sht15_data *data, | |
504 | int command, | |
505 | int timeout_msecs) | |
251eb40f JC |
506 | { |
507 | int ret; | |
82c7465b | 508 | u8 previous_config; |
99a0378d | 509 | |
251eb40f JC |
510 | ret = sht15_send_cmd(data, command); |
511 | if (ret) | |
512 | return ret; | |
513 | ||
514 | gpio_direction_input(data->pdata->gpio_data); | |
515 | atomic_set(&data->interrupt_handled, 0); | |
516 | ||
517 | enable_irq(gpio_to_irq(data->pdata->gpio_data)); | |
518 | if (gpio_get_value(data->pdata->gpio_data) == 0) { | |
519 | disable_irq_nosync(gpio_to_irq(data->pdata->gpio_data)); | |
25985edc | 520 | /* Only relevant if the interrupt hasn't occurred. */ |
251eb40f JC |
521 | if (!atomic_read(&data->interrupt_handled)) |
522 | schedule_work(&data->read_work); | |
523 | } | |
524 | ret = wait_event_timeout(data->wait_queue, | |
99a0378d | 525 | (data->state == SHT15_READING_NOTHING), |
251eb40f JC |
526 | msecs_to_jiffies(timeout_msecs)); |
527 | if (ret == 0) {/* timeout occurred */ | |
24205e08 | 528 | disable_irq_nosync(gpio_to_irq(data->pdata->gpio_data)); |
251eb40f JC |
529 | sht15_connection_reset(data); |
530 | return -ETIME; | |
531 | } | |
82c7465b JO |
532 | |
533 | /* | |
534 | * Perform checksum validation on the received data. | |
535 | * Specification mentions that in case a checksum verification fails, | |
536 | * a soft reset command must be sent to the device. | |
537 | */ | |
538 | if (data->checksumming && !data->checksum_ok) { | |
539 | previous_config = data->val_status & 0x07; | |
540 | ret = sht15_soft_reset(data); | |
541 | if (ret) | |
542 | return ret; | |
543 | if (previous_config) { | |
544 | ret = sht15_send_status(data, previous_config); | |
545 | if (ret) { | |
546 | dev_err(data->dev, | |
547 | "CRC validation failed, unable " | |
548 | "to restore device settings\n"); | |
549 | return ret; | |
550 | } | |
551 | } | |
552 | return -EAGAIN; | |
553 | } | |
554 | ||
251eb40f JC |
555 | return 0; |
556 | } | |
557 | ||
558 | /** | |
99a0378d | 559 | * sht15_update_measurements() - get updated measures from device if too old |
251eb40f | 560 | * @data: device state |
99a0378d VD |
561 | */ |
562 | static int sht15_update_measurements(struct sht15_data *data) | |
251eb40f JC |
563 | { |
564 | int ret = 0; | |
565 | int timeout = HZ; | |
566 | ||
567 | mutex_lock(&data->read_lock); | |
99a0378d VD |
568 | if (time_after(jiffies, data->last_measurement + timeout) |
569 | || !data->measurements_valid) { | |
570 | data->state = SHT15_READING_HUMID; | |
571 | ret = sht15_measurement(data, SHT15_MEASURE_RH, 160); | |
251eb40f JC |
572 | if (ret) |
573 | goto error_ret; | |
99a0378d VD |
574 | data->state = SHT15_READING_TEMP; |
575 | ret = sht15_measurement(data, SHT15_MEASURE_TEMP, 400); | |
251eb40f JC |
576 | if (ret) |
577 | goto error_ret; | |
99a0378d VD |
578 | data->measurements_valid = true; |
579 | data->last_measurement = jiffies; | |
251eb40f JC |
580 | } |
581 | error_ret: | |
582 | mutex_unlock(&data->read_lock); | |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
587 | /** | |
588 | * sht15_calc_temp() - convert the raw reading to a temperature | |
589 | * @data: device state | |
590 | * | |
591 | * As per section 4.3 of the data sheet. | |
99a0378d | 592 | */ |
251eb40f JC |
593 | static inline int sht15_calc_temp(struct sht15_data *data) |
594 | { | |
328a2c22 | 595 | int d1 = temppoints[0].d1; |
cc15c7eb | 596 | int d2 = (data->val_status & SHT15_STATUS_LOW_RESOLUTION) ? 40 : 10; |
251eb40f JC |
597 | int i; |
598 | ||
328a2c22 | 599 | for (i = ARRAY_SIZE(temppoints) - 1; i > 0; i--) |
251eb40f JC |
600 | /* Find pointer to interpolate */ |
601 | if (data->supply_uV > temppoints[i - 1].vdd) { | |
328a2c22 | 602 | d1 = (data->supply_uV - temppoints[i - 1].vdd) |
251eb40f JC |
603 | * (temppoints[i].d1 - temppoints[i - 1].d1) |
604 | / (temppoints[i].vdd - temppoints[i - 1].vdd) | |
605 | + temppoints[i - 1].d1; | |
606 | break; | |
607 | } | |
608 | ||
cc15c7eb | 609 | return data->val_temp * d2 + d1; |
251eb40f JC |
610 | } |
611 | ||
612 | /** | |
613 | * sht15_calc_humid() - using last temperature convert raw to humid | |
614 | * @data: device state | |
615 | * | |
616 | * This is the temperature compensated version as per section 4.2 of | |
617 | * the data sheet. | |
99a0378d VD |
618 | * |
619 | * The sensor is assumed to be V3, which is compatible with V4. | |
620 | * Humidity conversion coefficients are shown in table 7 of the datasheet. | |
621 | */ | |
251eb40f JC |
622 | static inline int sht15_calc_humid(struct sht15_data *data) |
623 | { | |
99a0378d | 624 | int rh_linear; /* milli percent */ |
251eb40f | 625 | int temp = sht15_calc_temp(data); |
cc15c7eb VD |
626 | int c2, c3; |
627 | int t2; | |
251eb40f | 628 | const int c1 = -4; |
cc15c7eb VD |
629 | |
630 | if (data->val_status & SHT15_STATUS_LOW_RESOLUTION) { | |
631 | c2 = 648000; /* x 10 ^ -6 */ | |
632 | c3 = -7200; /* x 10 ^ -7 */ | |
633 | t2 = 1280; | |
634 | } else { | |
635 | c2 = 40500; /* x 10 ^ -6 */ | |
636 | c3 = -28; /* x 10 ^ -7 */ | |
637 | t2 = 80; | |
638 | } | |
251eb40f | 639 | |
99a0378d VD |
640 | rh_linear = c1 * 1000 |
641 | + c2 * data->val_humid / 1000 | |
ccd32e73 | 642 | + (data->val_humid * data->val_humid * c3) / 10000; |
cc15c7eb | 643 | return (temp - 25000) * (10000 + t2 * data->val_humid) |
99a0378d | 644 | / 1000000 + rh_linear; |
251eb40f JC |
645 | } |
646 | ||
cc15c7eb VD |
647 | /** |
648 | * sht15_show_status() - show status information in sysfs | |
649 | * @dev: device. | |
650 | * @attr: device attribute. | |
651 | * @buf: sysfs buffer where information is written to. | |
652 | * | |
653 | * Will be called on read access to temp1_fault, humidity1_fault | |
654 | * and heater_enable sysfs attributes. | |
655 | * Returns number of bytes written into buffer, negative errno on error. | |
656 | */ | |
657 | static ssize_t sht15_show_status(struct device *dev, | |
658 | struct device_attribute *attr, | |
659 | char *buf) | |
660 | { | |
661 | int ret; | |
662 | struct sht15_data *data = dev_get_drvdata(dev); | |
663 | u8 bit = to_sensor_dev_attr(attr)->index; | |
664 | ||
665 | ret = sht15_update_status(data); | |
666 | ||
667 | return ret ? ret : sprintf(buf, "%d\n", !!(data->val_status & bit)); | |
668 | } | |
669 | ||
670 | /** | |
671 | * sht15_store_heater() - change heater state via sysfs | |
672 | * @dev: device. | |
673 | * @attr: device attribute. | |
674 | * @buf: sysfs buffer to read the new heater state from. | |
675 | * @count: length of the data. | |
676 | * | |
e9b6e9f3 | 677 | * Will be called on write access to heater_enable sysfs attribute. |
cc15c7eb VD |
678 | * Returns number of bytes actually decoded, negative errno on error. |
679 | */ | |
680 | static ssize_t sht15_store_heater(struct device *dev, | |
681 | struct device_attribute *attr, | |
682 | const char *buf, size_t count) | |
683 | { | |
684 | int ret; | |
685 | struct sht15_data *data = dev_get_drvdata(dev); | |
686 | long value; | |
687 | u8 status; | |
688 | ||
179c4fdb | 689 | if (kstrtol(buf, 10, &value)) |
cc15c7eb VD |
690 | return -EINVAL; |
691 | ||
692 | mutex_lock(&data->read_lock); | |
693 | status = data->val_status & 0x07; | |
694 | if (!!value) | |
695 | status |= SHT15_STATUS_HEATER; | |
696 | else | |
697 | status &= ~SHT15_STATUS_HEATER; | |
698 | ||
699 | ret = sht15_send_status(data, status); | |
700 | mutex_unlock(&data->read_lock); | |
701 | ||
702 | return ret ? ret : count; | |
703 | } | |
704 | ||
99a0378d VD |
705 | /** |
706 | * sht15_show_temp() - show temperature measurement value in sysfs | |
707 | * @dev: device. | |
708 | * @attr: device attribute. | |
709 | * @buf: sysfs buffer where measurement values are written to. | |
710 | * | |
711 | * Will be called on read access to temp1_input sysfs attribute. | |
712 | * Returns number of bytes written into buffer, negative errno on error. | |
713 | */ | |
251eb40f JC |
714 | static ssize_t sht15_show_temp(struct device *dev, |
715 | struct device_attribute *attr, | |
716 | char *buf) | |
717 | { | |
718 | int ret; | |
719 | struct sht15_data *data = dev_get_drvdata(dev); | |
720 | ||
721 | /* Technically no need to read humidity as well */ | |
99a0378d | 722 | ret = sht15_update_measurements(data); |
251eb40f JC |
723 | |
724 | return ret ? ret : sprintf(buf, "%d\n", | |
725 | sht15_calc_temp(data)); | |
726 | } | |
727 | ||
99a0378d VD |
728 | /** |
729 | * sht15_show_humidity() - show humidity measurement value in sysfs | |
730 | * @dev: device. | |
731 | * @attr: device attribute. | |
732 | * @buf: sysfs buffer where measurement values are written to. | |
733 | * | |
734 | * Will be called on read access to humidity1_input sysfs attribute. | |
735 | * Returns number of bytes written into buffer, negative errno on error. | |
736 | */ | |
251eb40f JC |
737 | static ssize_t sht15_show_humidity(struct device *dev, |
738 | struct device_attribute *attr, | |
739 | char *buf) | |
740 | { | |
741 | int ret; | |
742 | struct sht15_data *data = dev_get_drvdata(dev); | |
743 | ||
99a0378d | 744 | ret = sht15_update_measurements(data); |
251eb40f JC |
745 | |
746 | return ret ? ret : sprintf(buf, "%d\n", sht15_calc_humid(data)); | |
99a0378d VD |
747 | } |
748 | ||
251eb40f JC |
749 | static ssize_t show_name(struct device *dev, |
750 | struct device_attribute *attr, | |
751 | char *buf) | |
752 | { | |
753 | struct platform_device *pdev = to_platform_device(dev); | |
754 | return sprintf(buf, "%s\n", pdev->name); | |
755 | } | |
756 | ||
99a0378d VD |
757 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, |
758 | sht15_show_temp, NULL, 0); | |
759 | static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO, | |
760 | sht15_show_humidity, NULL, 0); | |
cc15c7eb VD |
761 | static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, sht15_show_status, NULL, |
762 | SHT15_STATUS_LOW_BATTERY); | |
763 | static SENSOR_DEVICE_ATTR(humidity1_fault, S_IRUGO, sht15_show_status, NULL, | |
764 | SHT15_STATUS_LOW_BATTERY); | |
765 | static SENSOR_DEVICE_ATTR(heater_enable, S_IRUGO | S_IWUSR, sht15_show_status, | |
766 | sht15_store_heater, SHT15_STATUS_HEATER); | |
251eb40f JC |
767 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
768 | static struct attribute *sht15_attrs[] = { | |
769 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
770 | &sensor_dev_attr_humidity1_input.dev_attr.attr, | |
cc15c7eb VD |
771 | &sensor_dev_attr_temp1_fault.dev_attr.attr, |
772 | &sensor_dev_attr_humidity1_fault.dev_attr.attr, | |
773 | &sensor_dev_attr_heater_enable.dev_attr.attr, | |
251eb40f JC |
774 | &dev_attr_name.attr, |
775 | NULL, | |
776 | }; | |
777 | ||
778 | static const struct attribute_group sht15_attr_group = { | |
779 | .attrs = sht15_attrs, | |
780 | }; | |
781 | ||
782 | static irqreturn_t sht15_interrupt_fired(int irq, void *d) | |
783 | { | |
784 | struct sht15_data *data = d; | |
99a0378d | 785 | |
251eb40f JC |
786 | /* First disable the interrupt */ |
787 | disable_irq_nosync(irq); | |
788 | atomic_inc(&data->interrupt_handled); | |
789 | /* Then schedule a reading work struct */ | |
99a0378d | 790 | if (data->state != SHT15_READING_NOTHING) |
251eb40f JC |
791 | schedule_work(&data->read_work); |
792 | return IRQ_HANDLED; | |
793 | } | |
794 | ||
251eb40f JC |
795 | static void sht15_bh_read_data(struct work_struct *work_s) |
796 | { | |
251eb40f | 797 | uint16_t val = 0; |
82c7465b JO |
798 | u8 dev_checksum = 0; |
799 | u8 checksum_vals[3]; | |
251eb40f JC |
800 | struct sht15_data *data |
801 | = container_of(work_s, struct sht15_data, | |
802 | read_work); | |
99a0378d | 803 | |
251eb40f JC |
804 | /* Firstly, verify the line is low */ |
805 | if (gpio_get_value(data->pdata->gpio_data)) { | |
99a0378d VD |
806 | /* |
807 | * If not, then start the interrupt again - care here as could | |
808 | * have gone low in meantime so verify it hasn't! | |
809 | */ | |
251eb40f JC |
810 | atomic_set(&data->interrupt_handled, 0); |
811 | enable_irq(gpio_to_irq(data->pdata->gpio_data)); | |
c9e1498a | 812 | /* If still not occurred or another handler was scheduled */ |
251eb40f JC |
813 | if (gpio_get_value(data->pdata->gpio_data) |
814 | || atomic_read(&data->interrupt_handled)) | |
815 | return; | |
816 | } | |
99a0378d | 817 | |
251eb40f | 818 | /* Read the data back from the device */ |
cc15c7eb VD |
819 | val = sht15_read_byte(data); |
820 | val <<= 8; | |
821 | sht15_ack(data); | |
822 | val |= sht15_read_byte(data); | |
99a0378d | 823 | |
82c7465b JO |
824 | if (data->checksumming) { |
825 | /* | |
826 | * Ask the device for a checksum and read it back. | |
827 | * Note: the device sends the checksum byte reversed. | |
828 | */ | |
829 | sht15_ack(data); | |
830 | dev_checksum = sht15_reverse(sht15_read_byte(data)); | |
831 | checksum_vals[0] = (data->state == SHT15_READING_TEMP) ? | |
832 | SHT15_MEASURE_TEMP : SHT15_MEASURE_RH; | |
833 | checksum_vals[1] = (u8) (val >> 8); | |
834 | checksum_vals[2] = (u8) val; | |
835 | data->checksum_ok | |
836 | = (sht15_crc8(data, checksum_vals, 3) == dev_checksum); | |
837 | } | |
838 | ||
251eb40f JC |
839 | /* Tell the device we are done */ |
840 | sht15_end_transmission(data); | |
841 | ||
99a0378d | 842 | switch (data->state) { |
251eb40f JC |
843 | case SHT15_READING_TEMP: |
844 | data->val_temp = val; | |
845 | break; | |
846 | case SHT15_READING_HUMID: | |
847 | data->val_humid = val; | |
848 | break; | |
99a0378d VD |
849 | default: |
850 | break; | |
251eb40f JC |
851 | } |
852 | ||
99a0378d | 853 | data->state = SHT15_READING_NOTHING; |
251eb40f JC |
854 | wake_up(&data->wait_queue); |
855 | } | |
856 | ||
857 | static void sht15_update_voltage(struct work_struct *work_s) | |
858 | { | |
859 | struct sht15_data *data | |
860 | = container_of(work_s, struct sht15_data, | |
861 | update_supply_work); | |
862 | data->supply_uV = regulator_get_voltage(data->reg); | |
863 | } | |
864 | ||
865 | /** | |
866 | * sht15_invalidate_voltage() - mark supply voltage invalid when notified by reg | |
867 | * @nb: associated notification structure | |
868 | * @event: voltage regulator state change event code | |
869 | * @ignored: function parameter - ignored here | |
870 | * | |
871 | * Note that as the notification code holds the regulator lock, we have | |
872 | * to schedule an update of the supply voltage rather than getting it directly. | |
99a0378d | 873 | */ |
251eb40f | 874 | static int sht15_invalidate_voltage(struct notifier_block *nb, |
99a0378d VD |
875 | unsigned long event, |
876 | void *ignored) | |
251eb40f JC |
877 | { |
878 | struct sht15_data *data = container_of(nb, struct sht15_data, nb); | |
879 | ||
880 | if (event == REGULATOR_EVENT_VOLTAGE_CHANGE) | |
881 | data->supply_uV_valid = false; | |
882 | schedule_work(&data->update_supply_work); | |
883 | ||
884 | return NOTIFY_OK; | |
885 | } | |
886 | ||
6c931ae1 | 887 | static int sht15_probe(struct platform_device *pdev) |
251eb40f | 888 | { |
6edf3c30 | 889 | int ret; |
38fe7560 | 890 | struct sht15_data *data; |
cc15c7eb | 891 | u8 status = 0; |
251eb40f | 892 | |
38fe7560 GR |
893 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
894 | if (!data) | |
895 | return -ENOMEM; | |
251eb40f JC |
896 | |
897 | INIT_WORK(&data->read_work, sht15_bh_read_data); | |
898 | INIT_WORK(&data->update_supply_work, sht15_update_voltage); | |
899 | platform_set_drvdata(pdev, data); | |
900 | mutex_init(&data->read_lock); | |
901 | data->dev = &pdev->dev; | |
902 | init_waitqueue_head(&data->wait_queue); | |
903 | ||
904 | if (pdev->dev.platform_data == NULL) { | |
99a0378d | 905 | dev_err(&pdev->dev, "no platform data supplied\n"); |
38fe7560 | 906 | return -EINVAL; |
251eb40f JC |
907 | } |
908 | data->pdata = pdev->dev.platform_data; | |
99a0378d | 909 | data->supply_uV = data->pdata->supply_mv * 1000; |
82c7465b JO |
910 | if (data->pdata->checksum) |
911 | data->checksumming = true; | |
cc15c7eb VD |
912 | if (data->pdata->no_otp_reload) |
913 | status |= SHT15_STATUS_NO_OTP_RELOAD; | |
914 | if (data->pdata->low_resolution) | |
915 | status |= SHT15_STATUS_LOW_RESOLUTION; | |
251eb40f | 916 | |
99a0378d VD |
917 | /* |
918 | * If a regulator is available, | |
919 | * query what the supply voltage actually is! | |
920 | */ | |
38fe7560 | 921 | data->reg = devm_regulator_get(data->dev, "vcc"); |
251eb40f | 922 | if (!IS_ERR(data->reg)) { |
c7a78d2c JD |
923 | int voltage; |
924 | ||
925 | voltage = regulator_get_voltage(data->reg); | |
926 | if (voltage) | |
927 | data->supply_uV = voltage; | |
928 | ||
251eb40f | 929 | regulator_enable(data->reg); |
99a0378d VD |
930 | /* |
931 | * Setup a notifier block to update this if another device | |
932 | * causes the voltage to change | |
933 | */ | |
251eb40f JC |
934 | data->nb.notifier_call = &sht15_invalidate_voltage; |
935 | ret = regulator_register_notifier(data->reg, &data->nb); | |
181148ae VD |
936 | if (ret) { |
937 | dev_err(&pdev->dev, | |
938 | "regulator notifier request failed\n"); | |
939 | regulator_disable(data->reg); | |
38fe7560 | 940 | return ret; |
181148ae | 941 | } |
251eb40f | 942 | } |
99a0378d VD |
943 | |
944 | /* Try requesting the GPIOs */ | |
38fe7560 | 945 | ret = devm_gpio_request(&pdev->dev, data->pdata->gpio_sck, "SHT15 sck"); |
251eb40f | 946 | if (ret) { |
99a0378d | 947 | dev_err(&pdev->dev, "gpio request failed\n"); |
181148ae | 948 | goto err_release_reg; |
251eb40f JC |
949 | } |
950 | gpio_direction_output(data->pdata->gpio_sck, 0); | |
99a0378d | 951 | |
38fe7560 GR |
952 | ret = devm_gpio_request(&pdev->dev, data->pdata->gpio_data, |
953 | "SHT15 data"); | |
251eb40f | 954 | if (ret) { |
99a0378d | 955 | dev_err(&pdev->dev, "gpio request failed\n"); |
38fe7560 | 956 | goto err_release_reg; |
251eb40f | 957 | } |
251eb40f | 958 | |
38fe7560 GR |
959 | ret = devm_request_irq(&pdev->dev, gpio_to_irq(data->pdata->gpio_data), |
960 | sht15_interrupt_fired, | |
961 | IRQF_TRIGGER_FALLING, | |
962 | "sht15 data", | |
963 | data); | |
251eb40f | 964 | if (ret) { |
99a0378d | 965 | dev_err(&pdev->dev, "failed to get irq for data line\n"); |
38fe7560 | 966 | goto err_release_reg; |
251eb40f JC |
967 | } |
968 | disable_irq_nosync(gpio_to_irq(data->pdata->gpio_data)); | |
969 | sht15_connection_reset(data); | |
181148ae VD |
970 | ret = sht15_soft_reset(data); |
971 | if (ret) | |
38fe7560 | 972 | goto err_release_reg; |
181148ae | 973 | |
cc15c7eb VD |
974 | /* write status with platform data options */ |
975 | if (status) { | |
976 | ret = sht15_send_status(data, status); | |
977 | if (ret) | |
38fe7560 | 978 | goto err_release_reg; |
cc15c7eb VD |
979 | } |
980 | ||
181148ae VD |
981 | ret = sysfs_create_group(&pdev->dev.kobj, &sht15_attr_group); |
982 | if (ret) { | |
983 | dev_err(&pdev->dev, "sysfs create failed\n"); | |
38fe7560 | 984 | goto err_release_reg; |
181148ae | 985 | } |
251eb40f JC |
986 | |
987 | data->hwmon_dev = hwmon_device_register(data->dev); | |
988 | if (IS_ERR(data->hwmon_dev)) { | |
989 | ret = PTR_ERR(data->hwmon_dev); | |
181148ae | 990 | goto err_release_sysfs_group; |
251eb40f | 991 | } |
99a0378d | 992 | |
251eb40f JC |
993 | return 0; |
994 | ||
181148ae VD |
995 | err_release_sysfs_group: |
996 | sysfs_remove_group(&pdev->dev.kobj, &sht15_attr_group); | |
181148ae VD |
997 | err_release_reg: |
998 | if (!IS_ERR(data->reg)) { | |
999 | regulator_unregister_notifier(data->reg, &data->nb); | |
1000 | regulator_disable(data->reg); | |
181148ae | 1001 | } |
251eb40f JC |
1002 | return ret; |
1003 | } | |
1004 | ||
281dfd0b | 1005 | static int sht15_remove(struct platform_device *pdev) |
251eb40f JC |
1006 | { |
1007 | struct sht15_data *data = platform_get_drvdata(pdev); | |
1008 | ||
99a0378d VD |
1009 | /* |
1010 | * Make sure any reads from the device are done and | |
1011 | * prevent new ones beginning | |
1012 | */ | |
251eb40f | 1013 | mutex_lock(&data->read_lock); |
cc15c7eb VD |
1014 | if (sht15_soft_reset(data)) { |
1015 | mutex_unlock(&data->read_lock); | |
1016 | return -EFAULT; | |
1017 | } | |
251eb40f JC |
1018 | hwmon_device_unregister(data->hwmon_dev); |
1019 | sysfs_remove_group(&pdev->dev.kobj, &sht15_attr_group); | |
1020 | if (!IS_ERR(data->reg)) { | |
1021 | regulator_unregister_notifier(data->reg, &data->nb); | |
1022 | regulator_disable(data->reg); | |
251eb40f JC |
1023 | } |
1024 | ||
251eb40f | 1025 | mutex_unlock(&data->read_lock); |
99a0378d | 1026 | |
251eb40f JC |
1027 | return 0; |
1028 | } | |
1029 | ||
edec5af7 VD |
1030 | static struct platform_device_id sht15_device_ids[] = { |
1031 | { "sht10", sht10 }, | |
1032 | { "sht11", sht11 }, | |
1033 | { "sht15", sht15 }, | |
1034 | { "sht71", sht71 }, | |
1035 | { "sht75", sht75 }, | |
1036 | { } | |
251eb40f | 1037 | }; |
edec5af7 | 1038 | MODULE_DEVICE_TABLE(platform, sht15_device_ids); |
251eb40f | 1039 | |
edec5af7 VD |
1040 | static struct platform_driver sht15_driver = { |
1041 | .driver = { | |
1042 | .name = "sht15", | |
1043 | .owner = THIS_MODULE, | |
1044 | }, | |
1045 | .probe = sht15_probe, | |
9e5e9b7a | 1046 | .remove = sht15_remove, |
edec5af7 VD |
1047 | .id_table = sht15_device_ids, |
1048 | }; | |
1049 | module_platform_driver(sht15_driver); | |
251eb40f JC |
1050 | |
1051 | MODULE_LICENSE("GPL"); | |
edec5af7 | 1052 | MODULE_DESCRIPTION("Sensirion SHT15 temperature and humidity sensor driver"); |