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1/*
2 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
3 * monitoring
4 * Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
5 *
6 * Based on the lm83 driver. The LM90 is a sensor chip made by National
7 * Semiconductor. It reports up to two temperatures (its own plus up to
8 * one external one) with a 0.125 deg resolution (1 deg for local
9 * temperature) and a 3-4 deg accuracy. Complete datasheet can be
10 * obtained from National's website at:
11 * http://www.national.com/pf/LM/LM90.html
12 *
13 * This driver also supports the LM89 and LM99, two other sensor chips
14 * made by National Semiconductor. Both have an increased remote
15 * temperature measurement accuracy (1 degree), and the LM99
16 * additionally shifts remote temperatures (measured and limits) by 16
17 * degrees, which allows for higher temperatures measurement. The
18 * driver doesn't handle it since it can be done easily in user-space.
19 * Complete datasheets can be obtained from National's website at:
20 * http://www.national.com/pf/LM/LM89.html
21 * http://www.national.com/pf/LM/LM99.html
22 * Note that there is no way to differenciate between both chips.
23 *
24 * This driver also supports the LM86, another sensor chip made by
25 * National Semiconductor. It is exactly similar to the LM90 except it
26 * has a higher accuracy.
27 * Complete datasheet can be obtained from National's website at:
28 * http://www.national.com/pf/LM/LM86.html
29 *
30 * This driver also supports the ADM1032, a sensor chip made by Analog
31 * Devices. That chip is similar to the LM90, with a few differences
32 * that are not handled by this driver. Complete datasheet can be
33 * obtained from Analog's website at:
34 * http://products.analog.com/products/info.asp?product=ADM1032
35 * Among others, it has a higher accuracy than the LM90, much like the
36 * LM86 does.
37 *
38 * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
39 * chips made by Maxim. These chips are similar to the LM86. Complete
40 * datasheet can be obtained at Maxim's website at:
41 * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
42 * Note that there is no easy way to differenciate between the three
43 * variants. The extra address and features of the MAX6659 are not
44 * supported by this driver.
45 *
46 * This driver also supports the ADT7461 chip from Analog Devices but
47 * only in its "compatability mode". If an ADT7461 chip is found but
48 * is configured in non-compatible mode (where its temperature
49 * register values are decoded differently) it is ignored by this
50 * driver. Complete datasheet can be obtained from Analog's website
51 * at:
52 * http://products.analog.com/products/info.asp?product=ADT7461
53 *
54 * Since the LM90 was the first chipset supported by this driver, most
55 * comments will refer to this chipset, but are actually general and
56 * concern all supported chipsets, unless mentioned otherwise.
57 *
58 * This program is free software; you can redistribute it and/or modify
59 * it under the terms of the GNU General Public License as published by
60 * the Free Software Foundation; either version 2 of the License, or
61 * (at your option) any later version.
62 *
63 * This program is distributed in the hope that it will be useful,
64 * but WITHOUT ANY WARRANTY; without even the implied warranty of
65 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
66 * GNU General Public License for more details.
67 *
68 * You should have received a copy of the GNU General Public License
69 * along with this program; if not, write to the Free Software
70 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
71 */
72
73#include <linux/config.h>
74#include <linux/module.h>
75#include <linux/init.h>
76#include <linux/slab.h>
77#include <linux/jiffies.h>
78#include <linux/i2c.h>
79#include <linux/i2c-sensor.h>
80
81/*
82 * Addresses to scan
83 * Address is fully defined internally and cannot be changed except for
84 * MAX6659.
85 * LM86, LM89, LM90, LM99, ADM1032, MAX6657 and MAX6658 have address 0x4c.
86 * LM89-1, and LM99-1 have address 0x4d.
87 * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
88 * ADT7461 always has address 0x4c.
89 */
90
91static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END };
92static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
93
94/*
95 * Insmod parameters
96 */
97
98SENSORS_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461);
99
100/*
101 * The LM90 registers
102 */
103
104#define LM90_REG_R_MAN_ID 0xFE
105#define LM90_REG_R_CHIP_ID 0xFF
106#define LM90_REG_R_CONFIG1 0x03
107#define LM90_REG_W_CONFIG1 0x09
108#define LM90_REG_R_CONFIG2 0xBF
109#define LM90_REG_W_CONFIG2 0xBF
110#define LM90_REG_R_CONVRATE 0x04
111#define LM90_REG_W_CONVRATE 0x0A
112#define LM90_REG_R_STATUS 0x02
113#define LM90_REG_R_LOCAL_TEMP 0x00
114#define LM90_REG_R_LOCAL_HIGH 0x05
115#define LM90_REG_W_LOCAL_HIGH 0x0B
116#define LM90_REG_R_LOCAL_LOW 0x06
117#define LM90_REG_W_LOCAL_LOW 0x0C
118#define LM90_REG_R_LOCAL_CRIT 0x20
119#define LM90_REG_W_LOCAL_CRIT 0x20
120#define LM90_REG_R_REMOTE_TEMPH 0x01
121#define LM90_REG_R_REMOTE_TEMPL 0x10
122#define LM90_REG_R_REMOTE_OFFSH 0x11
123#define LM90_REG_W_REMOTE_OFFSH 0x11
124#define LM90_REG_R_REMOTE_OFFSL 0x12
125#define LM90_REG_W_REMOTE_OFFSL 0x12
126#define LM90_REG_R_REMOTE_HIGHH 0x07
127#define LM90_REG_W_REMOTE_HIGHH 0x0D
128#define LM90_REG_R_REMOTE_HIGHL 0x13
129#define LM90_REG_W_REMOTE_HIGHL 0x13
130#define LM90_REG_R_REMOTE_LOWH 0x08
131#define LM90_REG_W_REMOTE_LOWH 0x0E
132#define LM90_REG_R_REMOTE_LOWL 0x14
133#define LM90_REG_W_REMOTE_LOWL 0x14
134#define LM90_REG_R_REMOTE_CRIT 0x19
135#define LM90_REG_W_REMOTE_CRIT 0x19
136#define LM90_REG_R_TCRIT_HYST 0x21
137#define LM90_REG_W_TCRIT_HYST 0x21
138
139/*
140 * Conversions and various macros
141 * For local temperatures and limits, critical limits and the hysteresis
142 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celcius.
143 * For remote temperatures and limits, it uses signed 11-bit values with
144 * LSB = 0.125 degree Celcius, left-justified in 16-bit registers.
145 */
146
147#define TEMP1_FROM_REG(val) ((val) * 1000)
148#define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \
149 (val) >= 127000 ? 127 : \
150 (val) < 0 ? ((val) - 500) / 1000 : \
151 ((val) + 500) / 1000)
152#define TEMP2_FROM_REG(val) ((val) / 32 * 125)
153#define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
154 (val) >= 127875 ? 0x7FE0 : \
155 (val) < 0 ? ((val) - 62) / 125 * 32 : \
156 ((val) + 62) / 125 * 32)
157#define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
158 ((val) + 500) / 1000)
159
160/*
161 * ADT7461 is almost identical to LM90 except that attempts to write
162 * values that are outside the range 0 < temp < 127 are treated as
163 * the boundary value.
164 */
165
166#define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
167 (val) >= 127000 ? 127 : \
168 ((val) + 500) / 1000)
169#define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
170 (val) >= 127750 ? 0x7FC0 : \
171 ((val) + 125) / 250 * 64)
172
173/*
174 * Functions declaration
175 */
176
177static int lm90_attach_adapter(struct i2c_adapter *adapter);
178static int lm90_detect(struct i2c_adapter *adapter, int address,
179 int kind);
180static void lm90_init_client(struct i2c_client *client);
181static int lm90_detach_client(struct i2c_client *client);
182static struct lm90_data *lm90_update_device(struct device *dev);
183
184/*
185 * Driver data (common to all clients)
186 */
187
188static struct i2c_driver lm90_driver = {
189 .owner = THIS_MODULE,
190 .name = "lm90",
191 .id = I2C_DRIVERID_LM90,
192 .flags = I2C_DF_NOTIFY,
193 .attach_adapter = lm90_attach_adapter,
194 .detach_client = lm90_detach_client,
195};
196
197/*
198 * Client data (each client gets its own)
199 */
200
201struct lm90_data {
202 struct i2c_client client;
203 struct semaphore update_lock;
204 char valid; /* zero until following fields are valid */
205 unsigned long last_updated; /* in jiffies */
206 int kind;
207
208 /* registers values */
209 s8 temp_input1, temp_low1, temp_high1; /* local */
210 s16 temp_input2, temp_low2, temp_high2; /* remote, combined */
211 s8 temp_crit1, temp_crit2;
212 u8 temp_hyst;
213 u8 alarms; /* bitvector */
214};
215
216/*
217 * Sysfs stuff
218 */
219
220#define show_temp(value, converter) \
221static ssize_t show_##value(struct device *dev, char *buf) \
222{ \
223 struct lm90_data *data = lm90_update_device(dev); \
224 return sprintf(buf, "%d\n", converter(data->value)); \
225}
226show_temp(temp_input1, TEMP1_FROM_REG);
227show_temp(temp_input2, TEMP2_FROM_REG);
228show_temp(temp_low1, TEMP1_FROM_REG);
229show_temp(temp_low2, TEMP2_FROM_REG);
230show_temp(temp_high1, TEMP1_FROM_REG);
231show_temp(temp_high2, TEMP2_FROM_REG);
232show_temp(temp_crit1, TEMP1_FROM_REG);
233show_temp(temp_crit2, TEMP1_FROM_REG);
234
235#define set_temp1(value, reg) \
236static ssize_t set_##value(struct device *dev, const char *buf, \
237 size_t count) \
238{ \
239 struct i2c_client *client = to_i2c_client(dev); \
240 struct lm90_data *data = i2c_get_clientdata(client); \
241 long val = simple_strtol(buf, NULL, 10); \
242 \
243 down(&data->update_lock); \
244 if (data->kind == adt7461) \
245 data->value = TEMP1_TO_REG_ADT7461(val); \
246 else \
247 data->value = TEMP1_TO_REG(val); \
248 i2c_smbus_write_byte_data(client, reg, data->value); \
249 up(&data->update_lock); \
250 return count; \
251}
252#define set_temp2(value, regh, regl) \
253static ssize_t set_##value(struct device *dev, const char *buf, \
254 size_t count) \
255{ \
256 struct i2c_client *client = to_i2c_client(dev); \
257 struct lm90_data *data = i2c_get_clientdata(client); \
258 long val = simple_strtol(buf, NULL, 10); \
259 \
260 down(&data->update_lock); \
261 if (data->kind == adt7461) \
262 data->value = TEMP2_TO_REG_ADT7461(val); \
263 else \
264 data->value = TEMP2_TO_REG(val); \
265 i2c_smbus_write_byte_data(client, regh, data->value >> 8); \
266 i2c_smbus_write_byte_data(client, regl, data->value & 0xff); \
267 up(&data->update_lock); \
268 return count; \
269}
270set_temp1(temp_low1, LM90_REG_W_LOCAL_LOW);
271set_temp2(temp_low2, LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL);
272set_temp1(temp_high1, LM90_REG_W_LOCAL_HIGH);
273set_temp2(temp_high2, LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL);
274set_temp1(temp_crit1, LM90_REG_W_LOCAL_CRIT);
275set_temp1(temp_crit2, LM90_REG_W_REMOTE_CRIT);
276
277#define show_temp_hyst(value, basereg) \
278static ssize_t show_##value(struct device *dev, char *buf) \
279{ \
280 struct lm90_data *data = lm90_update_device(dev); \
281 return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->basereg) \
282 - TEMP1_FROM_REG(data->temp_hyst)); \
283}
284show_temp_hyst(temp_hyst1, temp_crit1);
285show_temp_hyst(temp_hyst2, temp_crit2);
286
287static ssize_t set_temp_hyst1(struct device *dev, const char *buf,
288 size_t count)
289{
290 struct i2c_client *client = to_i2c_client(dev);
291 struct lm90_data *data = i2c_get_clientdata(client);
292 long val = simple_strtol(buf, NULL, 10);
293 long hyst;
294
295 down(&data->update_lock);
296 hyst = TEMP1_FROM_REG(data->temp_crit1) - val;
297 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
298 HYST_TO_REG(hyst));
299 up(&data->update_lock);
300 return count;
301}
302
303static ssize_t show_alarms(struct device *dev, char *buf)
304{
305 struct lm90_data *data = lm90_update_device(dev);
306 return sprintf(buf, "%d\n", data->alarms);
307}
308
309static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
310static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL);
311static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_low1,
312 set_temp_low1);
313static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2,
314 set_temp_low2);
315static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_high1,
316 set_temp_high1);
317static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2,
318 set_temp_high2);
319static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit1,
320 set_temp_crit1);
321static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2,
322 set_temp_crit2);
323static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst1,
324 set_temp_hyst1);
325static DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_hyst2, NULL);
326static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
327
328/*
329 * Real code
330 */
331
332static int lm90_attach_adapter(struct i2c_adapter *adapter)
333{
334 if (!(adapter->class & I2C_CLASS_HWMON))
335 return 0;
336 return i2c_detect(adapter, &addr_data, lm90_detect);
337}
338
339/*
340 * The following function does more than just detection. If detection
341 * succeeds, it also registers the new chip.
342 */
343static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
344{
345 struct i2c_client *new_client;
346 struct lm90_data *data;
347 int err = 0;
348 const char *name = "";
349
350 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
351 goto exit;
352
353 if (!(data = kmalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
354 err = -ENOMEM;
355 goto exit;
356 }
357 memset(data, 0, sizeof(struct lm90_data));
358
359 /* The common I2C client data is placed right before the
360 LM90-specific data. */
361 new_client = &data->client;
362 i2c_set_clientdata(new_client, data);
363 new_client->addr = address;
364 new_client->adapter = adapter;
365 new_client->driver = &lm90_driver;
366 new_client->flags = 0;
367
368 /*
369 * Now we do the remaining detection. A negative kind means that
370 * the driver was loaded with no force parameter (default), so we
371 * must both detect and identify the chip. A zero kind means that
372 * the driver was loaded with the force parameter, the detection
373 * step shall be skipped. A positive kind means that the driver
374 * was loaded with the force parameter and a given kind of chip is
375 * requested, so both the detection and the identification steps
376 * are skipped.
377 */
378
379 /* Default to an LM90 if forced */
380 if (kind == 0)
381 kind = lm90;
382
383 if (kind < 0) { /* detection and identification */
384 u8 man_id, chip_id, reg_config1, reg_convrate;
385
386 man_id = i2c_smbus_read_byte_data(new_client,
387 LM90_REG_R_MAN_ID);
388 chip_id = i2c_smbus_read_byte_data(new_client,
389 LM90_REG_R_CHIP_ID);
390 reg_config1 = i2c_smbus_read_byte_data(new_client,
391 LM90_REG_R_CONFIG1);
392 reg_convrate = i2c_smbus_read_byte_data(new_client,
393 LM90_REG_R_CONVRATE);
394
395 if (man_id == 0x01) { /* National Semiconductor */
396 u8 reg_config2;
397
398 reg_config2 = i2c_smbus_read_byte_data(new_client,
399 LM90_REG_R_CONFIG2);
400
401 if ((reg_config1 & 0x2A) == 0x00
402 && (reg_config2 & 0xF8) == 0x00
403 && reg_convrate <= 0x09) {
404 if (address == 0x4C
405 && (chip_id & 0xF0) == 0x20) { /* LM90 */
406 kind = lm90;
407 } else
408 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
409 kind = lm99;
410 } else
411 if (address == 0x4C
412 && (chip_id & 0xF0) == 0x10) { /* LM86 */
413 kind = lm86;
414 }
415 }
416 } else
417 if (man_id == 0x41) { /* Analog Devices */
418 if (address == 0x4C
419 && (chip_id & 0xF0) == 0x40 /* ADM1032 */
420 && (reg_config1 & 0x3F) == 0x00
421 && reg_convrate <= 0x0A) {
422 kind = adm1032;
423 } else
424 if (address == 0x4c
425 && chip_id == 0x51 /* ADT7461 */
426 && (reg_config1 & 0x1F) == 0x00 /* check compat mode */
427 && reg_convrate <= 0x0A) {
428 kind = adt7461;
429 }
430 } else
431 if (man_id == 0x4D) { /* Maxim */
432 /*
433 * The Maxim variants do NOT have a chip_id register.
434 * Reading from that address will return the last read
435 * value, which in our case is those of the man_id
436 * register. Likewise, the config1 register seems to
437 * lack a low nibble, so the value will be those of the
438 * previous read, so in our case those of the man_id
439 * register.
440 */
441 if (chip_id == man_id
442 && (reg_config1 & 0x1F) == (man_id & 0x0F)
443 && reg_convrate <= 0x09) {
444 kind = max6657;
445 }
446 }
447
448 if (kind <= 0) { /* identification failed */
449 dev_info(&adapter->dev,
450 "Unsupported chip (man_id=0x%02X, "
451 "chip_id=0x%02X).\n", man_id, chip_id);
452 goto exit_free;
453 }
454 }
455
456 if (kind == lm90) {
457 name = "lm90";
458 } else if (kind == adm1032) {
459 name = "adm1032";
460 } else if (kind == lm99) {
461 name = "lm99";
462 } else if (kind == lm86) {
463 name = "lm86";
464 } else if (kind == max6657) {
465 name = "max6657";
466 } else if (kind == adt7461) {
467 name = "adt7461";
468 }
469
470 /* We can fill in the remaining client fields */
471 strlcpy(new_client->name, name, I2C_NAME_SIZE);
472 data->valid = 0;
473 data->kind = kind;
474 init_MUTEX(&data->update_lock);
475
476 /* Tell the I2C layer a new client has arrived */
477 if ((err = i2c_attach_client(new_client)))
478 goto exit_free;
479
480 /* Initialize the LM90 chip */
481 lm90_init_client(new_client);
482
483 /* Register sysfs hooks */
484 device_create_file(&new_client->dev, &dev_attr_temp1_input);
485 device_create_file(&new_client->dev, &dev_attr_temp2_input);
486 device_create_file(&new_client->dev, &dev_attr_temp1_min);
487 device_create_file(&new_client->dev, &dev_attr_temp2_min);
488 device_create_file(&new_client->dev, &dev_attr_temp1_max);
489 device_create_file(&new_client->dev, &dev_attr_temp2_max);
490 device_create_file(&new_client->dev, &dev_attr_temp1_crit);
491 device_create_file(&new_client->dev, &dev_attr_temp2_crit);
492 device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst);
493 device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst);
494 device_create_file(&new_client->dev, &dev_attr_alarms);
495
496 return 0;
497
498exit_free:
499 kfree(data);
500exit:
501 return err;
502}
503
504static void lm90_init_client(struct i2c_client *client)
505{
506 u8 config;
507
508 /*
509 * Start the conversions.
510 */
511 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
512 5); /* 2 Hz */
513 config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
514 if (config & 0x40)
515 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
516 config & 0xBF); /* run */
517}
518
519static int lm90_detach_client(struct i2c_client *client)
520{
521 int err;
522
523 if ((err = i2c_detach_client(client))) {
524 dev_err(&client->dev, "Client deregistration failed, "
525 "client not detached.\n");
526 return err;
527 }
528
529 kfree(i2c_get_clientdata(client));
530 return 0;
531}
532
533static struct lm90_data *lm90_update_device(struct device *dev)
534{
535 struct i2c_client *client = to_i2c_client(dev);
536 struct lm90_data *data = i2c_get_clientdata(client);
537
538 down(&data->update_lock);
539
540 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
541 u8 oldh, newh;
542
543 dev_dbg(&client->dev, "Updating lm90 data.\n");
544 data->temp_input1 = i2c_smbus_read_byte_data(client,
545 LM90_REG_R_LOCAL_TEMP);
546 data->temp_high1 = i2c_smbus_read_byte_data(client,
547 LM90_REG_R_LOCAL_HIGH);
548 data->temp_low1 = i2c_smbus_read_byte_data(client,
549 LM90_REG_R_LOCAL_LOW);
550 data->temp_crit1 = i2c_smbus_read_byte_data(client,
551 LM90_REG_R_LOCAL_CRIT);
552 data->temp_crit2 = i2c_smbus_read_byte_data(client,
553 LM90_REG_R_REMOTE_CRIT);
554 data->temp_hyst = i2c_smbus_read_byte_data(client,
555 LM90_REG_R_TCRIT_HYST);
556
557 /*
558 * There is a trick here. We have to read two registers to
559 * have the remote sensor temperature, but we have to beware
560 * a conversion could occur inbetween the readings. The
561 * datasheet says we should either use the one-shot
562 * conversion register, which we don't want to do (disables
563 * hardware monitoring) or monitor the busy bit, which is
564 * impossible (we can't read the values and monitor that bit
565 * at the exact same time). So the solution used here is to
566 * read the high byte once, then the low byte, then the high
567 * byte again. If the new high byte matches the old one,
568 * then we have a valid reading. Else we have to read the low
569 * byte again, and now we believe we have a correct reading.
570 */
571 oldh = i2c_smbus_read_byte_data(client,
572 LM90_REG_R_REMOTE_TEMPH);
573 data->temp_input2 = i2c_smbus_read_byte_data(client,
574 LM90_REG_R_REMOTE_TEMPL);
575 newh = i2c_smbus_read_byte_data(client,
576 LM90_REG_R_REMOTE_TEMPH);
577 if (newh != oldh) {
578 data->temp_input2 = i2c_smbus_read_byte_data(client,
579 LM90_REG_R_REMOTE_TEMPL);
580#ifdef DEBUG
581 oldh = i2c_smbus_read_byte_data(client,
582 LM90_REG_R_REMOTE_TEMPH);
583 /* oldh is actually newer */
584 if (newh != oldh)
585 dev_warn(&client->dev, "Remote temperature may be "
586 "wrong.\n");
587#endif
588 }
589 data->temp_input2 |= (newh << 8);
590
591 data->temp_high2 = (i2c_smbus_read_byte_data(client,
592 LM90_REG_R_REMOTE_HIGHH) << 8) +
593 i2c_smbus_read_byte_data(client,
594 LM90_REG_R_REMOTE_HIGHL);
595 data->temp_low2 = (i2c_smbus_read_byte_data(client,
596 LM90_REG_R_REMOTE_LOWH) << 8) +
597 i2c_smbus_read_byte_data(client,
598 LM90_REG_R_REMOTE_LOWL);
599 data->alarms = i2c_smbus_read_byte_data(client,
600 LM90_REG_R_STATUS);
601
602 data->last_updated = jiffies;
603 data->valid = 1;
604 }
605
606 up(&data->update_lock);
607
608 return data;
609}
610
611static int __init sensors_lm90_init(void)
612{
613 return i2c_add_driver(&lm90_driver);
614}
615
616static void __exit sensors_lm90_exit(void)
617{
618 i2c_del_driver(&lm90_driver);
619}
620
621MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
622MODULE_DESCRIPTION("LM90/ADM1032 driver");
623MODULE_LICENSE("GPL");
624
625module_init(sensors_lm90_init);
626module_exit(sensors_lm90_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-18 11:42:48 -0500