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1 | /* |
2 | * lm90.c - Part of lm_sensors, Linux kernel modules for hardware |
3 | * monitoring |
4 | * Copyright (C) 2003-2010 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. |
10 | * |
11 | * This driver also supports the LM89 and LM99, two other sensor chips |
12 | * made by National Semiconductor. Both have an increased remote |
13 | * temperature measurement accuracy (1 degree), and the LM99 |
14 | * additionally shifts remote temperatures (measured and limits) by 16 |
15 | * degrees, which allows for higher temperatures measurement. |
16 | * Note that there is no way to differentiate between both chips. |
17 | * When device is auto-detected, the driver will assume an LM99. |
18 | * |
19 | * This driver also supports the LM86, another sensor chip made by |
20 | * National Semiconductor. It is exactly similar to the LM90 except it |
21 | * has a higher accuracy. |
22 | * |
23 | * This driver also supports the ADM1032, a sensor chip made by Analog |
24 | * Devices. That chip is similar to the LM90, with a few differences |
25 | * that are not handled by this driver. Among others, it has a higher |
26 | * accuracy than the LM90, much like the LM86 does. |
27 | * |
28 | * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor |
29 | * chips made by Maxim. These chips are similar to the LM86. |
30 | * Note that there is no easy way to differentiate between the three |
31 | * variants. The extra address and features of the MAX6659 are not |
32 | * supported by this driver. These chips lack the remote temperature |
33 | * offset feature. |
34 | * |
35 | * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and |
36 | * MAX6692 chips made by Maxim. These are again similar to the LM86, |
37 | * but they use unsigned temperature values and can report temperatures |
38 | * from 0 to 145 degrees. |
39 | * |
40 | * This driver also supports the MAX6680 and MAX6681, two other sensor |
41 | * chips made by Maxim. These are quite similar to the other Maxim |
42 | * chips. The MAX6680 and MAX6681 only differ in the pinout so they can |
43 | * be treated identically. |
44 | * |
45 | * This driver also supports the ADT7461 chip from Analog Devices. |
46 | * It's supported in both compatibility and extended mode. It is mostly |
47 | * compatible with LM90 except for a data format difference for the |
48 | * temperature value registers. |
49 | * |
50 | * Since the LM90 was the first chipset supported by this driver, most |
51 | * comments will refer to this chipset, but are actually general and |
52 | * concern all supported chipsets, unless mentioned otherwise. |
53 | * |
54 | * This program is free software; you can redistribute it and/or modify |
55 | * it under the terms of the GNU General Public License as published by |
56 | * the Free Software Foundation; either version 2 of the License, or |
57 | * (at your option) any later version. |
58 | * |
59 | * This program is distributed in the hope that it will be useful, |
60 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
61 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
62 | * GNU General Public License for more details. |
63 | * |
64 | * You should have received a copy of the GNU General Public License |
65 | * along with this program; if not, write to the Free Software |
66 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
67 | */ |
68 | |
69 | #include <linux/module.h> |
70 | #include <linux/init.h> |
71 | #include <linux/slab.h> |
72 | #include <linux/jiffies.h> |
73 | #include <linux/i2c.h> |
74 | #include <linux/hwmon-sysfs.h> |
75 | #include <linux/hwmon.h> |
76 | #include <linux/err.h> |
77 | #include <linux/mutex.h> |
78 | #include <linux/sysfs.h> |
79 | |
80 | /* |
81 | * Addresses to scan |
82 | * Address is fully defined internally and cannot be changed except for |
83 | * MAX6659, MAX6680 and MAX6681. |
84 | * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6649, MAX6657 |
85 | * and MAX6658 have address 0x4c. |
86 | * ADM1032-2, ADT7461-2, LM89-1, LM99-1 and MAX6646 have address 0x4d. |
87 | * MAX6647 has address 0x4e. |
88 | * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported). |
89 | * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, |
90 | * 0x4c, 0x4d or 0x4e. |
91 | */ |
92 | |
93 | static const unsigned short normal_i2c[] = { |
94 | 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END }; |
95 | |
96 | enum chips { lm90, adm1032, lm99, lm86, max6657, adt7461, max6680, max6646, |
97 | w83l771 }; |
98 | |
99 | /* |
100 | * The LM90 registers |
101 | */ |
102 | |
103 | #define LM90_REG_R_MAN_ID 0xFE |
104 | #define LM90_REG_R_CHIP_ID 0xFF |
105 | #define LM90_REG_R_CONFIG1 0x03 |
106 | #define LM90_REG_W_CONFIG1 0x09 |
107 | #define LM90_REG_R_CONFIG2 0xBF |
108 | #define LM90_REG_W_CONFIG2 0xBF |
109 | #define LM90_REG_R_CONVRATE 0x04 |
110 | #define LM90_REG_W_CONVRATE 0x0A |
111 | #define LM90_REG_R_STATUS 0x02 |
112 | #define LM90_REG_R_LOCAL_TEMP 0x00 |
113 | #define LM90_REG_R_LOCAL_HIGH 0x05 |
114 | #define LM90_REG_W_LOCAL_HIGH 0x0B |
115 | #define LM90_REG_R_LOCAL_LOW 0x06 |
116 | #define LM90_REG_W_LOCAL_LOW 0x0C |
117 | #define LM90_REG_R_LOCAL_CRIT 0x20 |
118 | #define LM90_REG_W_LOCAL_CRIT 0x20 |
119 | #define LM90_REG_R_REMOTE_TEMPH 0x01 |
120 | #define LM90_REG_R_REMOTE_TEMPL 0x10 |
121 | #define LM90_REG_R_REMOTE_OFFSH 0x11 |
122 | #define LM90_REG_W_REMOTE_OFFSH 0x11 |
123 | #define LM90_REG_R_REMOTE_OFFSL 0x12 |
124 | #define LM90_REG_W_REMOTE_OFFSL 0x12 |
125 | #define LM90_REG_R_REMOTE_HIGHH 0x07 |
126 | #define LM90_REG_W_REMOTE_HIGHH 0x0D |
127 | #define LM90_REG_R_REMOTE_HIGHL 0x13 |
128 | #define LM90_REG_W_REMOTE_HIGHL 0x13 |
129 | #define LM90_REG_R_REMOTE_LOWH 0x08 |
130 | #define LM90_REG_W_REMOTE_LOWH 0x0E |
131 | #define LM90_REG_R_REMOTE_LOWL 0x14 |
132 | #define LM90_REG_W_REMOTE_LOWL 0x14 |
133 | #define LM90_REG_R_REMOTE_CRIT 0x19 |
134 | #define LM90_REG_W_REMOTE_CRIT 0x19 |
135 | #define LM90_REG_R_TCRIT_HYST 0x21 |
136 | #define LM90_REG_W_TCRIT_HYST 0x21 |
137 | |
138 | /* MAX6646/6647/6649/6657/6658/6659 registers */ |
139 | |
140 | #define MAX6657_REG_R_LOCAL_TEMPL 0x11 |
141 | |
142 | /* |
143 | * Device flags |
144 | */ |
145 | #define LM90_FLAG_ADT7461_EXT 0x01 /* ADT7461 extended mode */ |
146 | |
147 | /* |
148 | * Functions declaration |
149 | */ |
150 | |
151 | static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info); |
152 | static int lm90_probe(struct i2c_client *client, |
153 | const struct i2c_device_id *id); |
154 | static void lm90_init_client(struct i2c_client *client); |
155 | static void lm90_alert(struct i2c_client *client, unsigned int flag); |
156 | static int lm90_remove(struct i2c_client *client); |
157 | static struct lm90_data *lm90_update_device(struct device *dev); |
158 | |
159 | /* |
160 | * Driver data (common to all clients) |
161 | */ |
162 | |
163 | static const struct i2c_device_id lm90_id[] = { |
164 | { "adm1032", adm1032 }, |
165 | { "adt7461", adt7461 }, |
166 | { "lm90", lm90 }, |
167 | { "lm86", lm86 }, |
168 | { "lm89", lm86 }, |
169 | { "lm99", lm99 }, |
170 | { "max6646", max6646 }, |
171 | { "max6647", max6646 }, |
172 | { "max6649", max6646 }, |
173 | { "max6657", max6657 }, |
174 | { "max6658", max6657 }, |
175 | { "max6659", max6657 }, |
176 | { "max6680", max6680 }, |
177 | { "max6681", max6680 }, |
178 | { "w83l771", w83l771 }, |
179 | { } |
180 | }; |
181 | MODULE_DEVICE_TABLE(i2c, lm90_id); |
182 | |
183 | static struct i2c_driver lm90_driver = { |
184 | .class = I2C_CLASS_HWMON, |
185 | .driver = { |
186 | .name = "lm90", |
187 | }, |
188 | .probe = lm90_probe, |
189 | .remove = lm90_remove, |
190 | .alert = lm90_alert, |
191 | .id_table = lm90_id, |
192 | .detect = lm90_detect, |
193 | .address_list = normal_i2c, |
194 | }; |
195 | |
196 | /* |
197 | * Client data (each client gets its own) |
198 | */ |
199 | |
200 | struct lm90_data { |
201 | struct device *hwmon_dev; |
202 | struct mutex update_lock; |
203 | char valid; /* zero until following fields are valid */ |
204 | unsigned long last_updated; /* in jiffies */ |
205 | int kind; |
206 | int flags; |
207 | |
208 | u8 config_orig; /* Original configuration register value */ |
209 | u8 alert_alarms; /* Which alarm bits trigger ALERT# */ |
210 | |
211 | /* registers values */ |
212 | s8 temp8[4]; /* 0: local low limit |
213 | 1: local high limit |
214 | 2: local critical limit |
215 | 3: remote critical limit */ |
216 | s16 temp11[5]; /* 0: remote input |
217 | 1: remote low limit |
218 | 2: remote high limit |
219 | 3: remote offset (except max6646 and max6657) |
220 | 4: local input */ |
221 | u8 temp_hyst; |
222 | u8 alarms; /* bitvector */ |
223 | }; |
224 | |
225 | /* |
226 | * Conversions |
227 | * For local temperatures and limits, critical limits and the hysteresis |
228 | * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius. |
229 | * For remote temperatures and limits, it uses signed 11-bit values with |
230 | * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some |
231 | * Maxim chips use unsigned values. |
232 | */ |
233 | |
234 | static inline int temp_from_s8(s8 val) |
235 | { |
236 | return val * 1000; |
237 | } |
238 | |
239 | static inline int temp_from_u8(u8 val) |
240 | { |
241 | return val * 1000; |
242 | } |
243 | |
244 | static inline int temp_from_s16(s16 val) |
245 | { |
246 | return val / 32 * 125; |
247 | } |
248 | |
249 | static inline int temp_from_u16(u16 val) |
250 | { |
251 | return val / 32 * 125; |
252 | } |
253 | |
254 | static s8 temp_to_s8(long val) |
255 | { |
256 | if (val <= -128000) |
257 | return -128; |
258 | if (val >= 127000) |
259 | return 127; |
260 | if (val < 0) |
261 | return (val - 500) / 1000; |
262 | return (val + 500) / 1000; |
263 | } |
264 | |
265 | static u8 temp_to_u8(long val) |
266 | { |
267 | if (val <= 0) |
268 | return 0; |
269 | if (val >= 255000) |
270 | return 255; |
271 | return (val + 500) / 1000; |
272 | } |
273 | |
274 | static s16 temp_to_s16(long val) |
275 | { |
276 | if (val <= -128000) |
277 | return 0x8000; |
278 | if (val >= 127875) |
279 | return 0x7FE0; |
280 | if (val < 0) |
281 | return (val - 62) / 125 * 32; |
282 | return (val + 62) / 125 * 32; |
283 | } |
284 | |
285 | static u8 hyst_to_reg(long val) |
286 | { |
287 | if (val <= 0) |
288 | return 0; |
289 | if (val >= 30500) |
290 | return 31; |
291 | return (val + 500) / 1000; |
292 | } |
293 | |
294 | /* |
295 | * ADT7461 in compatibility mode is almost identical to LM90 except that |
296 | * attempts to write values that are outside the range 0 < temp < 127 are |
297 | * treated as the boundary value. |
298 | * |
299 | * ADT7461 in "extended mode" operation uses unsigned integers offset by |
300 | * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC. |
301 | */ |
302 | static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val) |
303 | { |
304 | if (data->flags & LM90_FLAG_ADT7461_EXT) |
305 | return (val - 64) * 1000; |
306 | else |
307 | return temp_from_s8(val); |
308 | } |
309 | |
310 | static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val) |
311 | { |
312 | if (data->flags & LM90_FLAG_ADT7461_EXT) |
313 | return (val - 0x4000) / 64 * 250; |
314 | else |
315 | return temp_from_s16(val); |
316 | } |
317 | |
318 | static u8 temp_to_u8_adt7461(struct lm90_data *data, long val) |
319 | { |
320 | if (data->flags & LM90_FLAG_ADT7461_EXT) { |
321 | if (val <= -64000) |
322 | return 0; |
323 | if (val >= 191000) |
324 | return 0xFF; |
325 | return (val + 500 + 64000) / 1000; |
326 | } else { |
327 | if (val <= 0) |
328 | return 0; |
329 | if (val >= 127000) |
330 | return 127; |
331 | return (val + 500) / 1000; |
332 | } |
333 | } |
334 | |
335 | static u16 temp_to_u16_adt7461(struct lm90_data *data, long val) |
336 | { |
337 | if (data->flags & LM90_FLAG_ADT7461_EXT) { |
338 | if (val <= -64000) |
339 | return 0; |
340 | if (val >= 191750) |
341 | return 0xFFC0; |
342 | return (val + 64000 + 125) / 250 * 64; |
343 | } else { |
344 | if (val <= 0) |
345 | return 0; |
346 | if (val >= 127750) |
347 | return 0x7FC0; |
348 | return (val + 125) / 250 * 64; |
349 | } |
350 | } |
351 | |
352 | /* |
353 | * Sysfs stuff |
354 | */ |
355 | |
356 | static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr, |
357 | char *buf) |
358 | { |
359 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
360 | struct lm90_data *data = lm90_update_device(dev); |
361 | int temp; |
362 | |
363 | if (data->kind == adt7461) |
364 | temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); |
365 | else if (data->kind == max6646) |
366 | temp = temp_from_u8(data->temp8[attr->index]); |
367 | else |
368 | temp = temp_from_s8(data->temp8[attr->index]); |
369 | |
370 | /* +16 degrees offset for temp2 for the LM99 */ |
371 | if (data->kind == lm99 && attr->index == 3) |
372 | temp += 16000; |
373 | |
374 | return sprintf(buf, "%d\n", temp); |
375 | } |
376 | |
377 | static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr, |
378 | const char *buf, size_t count) |
379 | { |
380 | static const u8 reg[4] = { |
381 | LM90_REG_W_LOCAL_LOW, |
382 | LM90_REG_W_LOCAL_HIGH, |
383 | LM90_REG_W_LOCAL_CRIT, |
384 | LM90_REG_W_REMOTE_CRIT, |
385 | }; |
386 | |
387 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
388 | struct i2c_client *client = to_i2c_client(dev); |
389 | struct lm90_data *data = i2c_get_clientdata(client); |
390 | long val = simple_strtol(buf, NULL, 10); |
391 | int nr = attr->index; |
392 | |
393 | /* +16 degrees offset for temp2 for the LM99 */ |
394 | if (data->kind == lm99 && attr->index == 3) |
395 | val -= 16000; |
396 | |
397 | mutex_lock(&data->update_lock); |
398 | if (data->kind == adt7461) |
399 | data->temp8[nr] = temp_to_u8_adt7461(data, val); |
400 | else if (data->kind == max6646) |
401 | data->temp8[nr] = temp_to_u8(val); |
402 | else |
403 | data->temp8[nr] = temp_to_s8(val); |
404 | i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]); |
405 | mutex_unlock(&data->update_lock); |
406 | return count; |
407 | } |
408 | |
409 | static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr, |
410 | char *buf) |
411 | { |
412 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
413 | struct lm90_data *data = lm90_update_device(dev); |
414 | int temp; |
415 | |
416 | if (data->kind == adt7461) |
417 | temp = temp_from_u16_adt7461(data, data->temp11[attr->index]); |
418 | else if (data->kind == max6646) |
419 | temp = temp_from_u16(data->temp11[attr->index]); |
420 | else |
421 | temp = temp_from_s16(data->temp11[attr->index]); |
422 | |
423 | /* +16 degrees offset for temp2 for the LM99 */ |
424 | if (data->kind == lm99 && attr->index <= 2) |
425 | temp += 16000; |
426 | |
427 | return sprintf(buf, "%d\n", temp); |
428 | } |
429 | |
430 | static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr, |
431 | const char *buf, size_t count) |
432 | { |
433 | static const u8 reg[6] = { |
434 | LM90_REG_W_REMOTE_LOWH, |
435 | LM90_REG_W_REMOTE_LOWL, |
436 | LM90_REG_W_REMOTE_HIGHH, |
437 | LM90_REG_W_REMOTE_HIGHL, |
438 | LM90_REG_W_REMOTE_OFFSH, |
439 | LM90_REG_W_REMOTE_OFFSL, |
440 | }; |
441 | |
442 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
443 | struct i2c_client *client = to_i2c_client(dev); |
444 | struct lm90_data *data = i2c_get_clientdata(client); |
445 | long val = simple_strtol(buf, NULL, 10); |
446 | int nr = attr->index; |
447 | |
448 | /* +16 degrees offset for temp2 for the LM99 */ |
449 | if (data->kind == lm99 && attr->index <= 2) |
450 | val -= 16000; |
451 | |
452 | mutex_lock(&data->update_lock); |
453 | if (data->kind == adt7461) |
454 | data->temp11[nr] = temp_to_u16_adt7461(data, val); |
455 | else if (data->kind == max6657 || data->kind == max6680) |
456 | data->temp11[nr] = temp_to_s8(val) << 8; |
457 | else if (data->kind == max6646) |
458 | data->temp11[nr] = temp_to_u8(val) << 8; |
459 | else |
460 | data->temp11[nr] = temp_to_s16(val); |
461 | |
462 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2], |
463 | data->temp11[nr] >> 8); |
464 | if (data->kind != max6657 && data->kind != max6680 |
465 | && data->kind != max6646) |
466 | i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1], |
467 | data->temp11[nr] & 0xff); |
468 | mutex_unlock(&data->update_lock); |
469 | return count; |
470 | } |
471 | |
472 | static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr, |
473 | char *buf) |
474 | { |
475 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
476 | struct lm90_data *data = lm90_update_device(dev); |
477 | int temp; |
478 | |
479 | if (data->kind == adt7461) |
480 | temp = temp_from_u8_adt7461(data, data->temp8[attr->index]); |
481 | else if (data->kind == max6646) |
482 | temp = temp_from_u8(data->temp8[attr->index]); |
483 | else |
484 | temp = temp_from_s8(data->temp8[attr->index]); |
485 | |
486 | /* +16 degrees offset for temp2 for the LM99 */ |
487 | if (data->kind == lm99 && attr->index == 3) |
488 | temp += 16000; |
489 | |
490 | return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst)); |
491 | } |
492 | |
493 | static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy, |
494 | const char *buf, size_t count) |
495 | { |
496 | struct i2c_client *client = to_i2c_client(dev); |
497 | struct lm90_data *data = i2c_get_clientdata(client); |
498 | long val = simple_strtol(buf, NULL, 10); |
499 | int temp; |
500 | |
501 | mutex_lock(&data->update_lock); |
502 | if (data->kind == adt7461) |
503 | temp = temp_from_u8_adt7461(data, data->temp8[2]); |
504 | else if (data->kind == max6646) |
505 | temp = temp_from_u8(data->temp8[2]); |
506 | else |
507 | temp = temp_from_s8(data->temp8[2]); |
508 | |
509 | data->temp_hyst = hyst_to_reg(temp - val); |
510 | i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, |
511 | data->temp_hyst); |
512 | mutex_unlock(&data->update_lock); |
513 | return count; |
514 | } |
515 | |
516 | static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy, |
517 | char *buf) |
518 | { |
519 | struct lm90_data *data = lm90_update_device(dev); |
520 | return sprintf(buf, "%d\n", data->alarms); |
521 | } |
522 | |
523 | static ssize_t show_alarm(struct device *dev, struct device_attribute |
524 | *devattr, char *buf) |
525 | { |
526 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
527 | struct lm90_data *data = lm90_update_device(dev); |
528 | int bitnr = attr->index; |
529 | |
530 | return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1); |
531 | } |
532 | |
533 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4); |
534 | static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0); |
535 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8, |
536 | set_temp8, 0); |
537 | static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11, |
538 | set_temp11, 1); |
539 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8, |
540 | set_temp8, 1); |
541 | static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11, |
542 | set_temp11, 2); |
543 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8, |
544 | set_temp8, 2); |
545 | static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8, |
546 | set_temp8, 3); |
547 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst, |
548 | set_temphyst, 2); |
549 | static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3); |
550 | static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11, |
551 | set_temp11, 3); |
552 | |
553 | /* Individual alarm files */ |
554 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0); |
555 | static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1); |
556 | static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2); |
557 | static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3); |
558 | static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4); |
559 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5); |
560 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6); |
561 | /* Raw alarm file for compatibility */ |
562 | static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); |
563 | |
564 | static struct attribute *lm90_attributes[] = { |
565 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
566 | &sensor_dev_attr_temp2_input.dev_attr.attr, |
567 | &sensor_dev_attr_temp1_min.dev_attr.attr, |
568 | &sensor_dev_attr_temp2_min.dev_attr.attr, |
569 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
570 | &sensor_dev_attr_temp2_max.dev_attr.attr, |
571 | &sensor_dev_attr_temp1_crit.dev_attr.attr, |
572 | &sensor_dev_attr_temp2_crit.dev_attr.attr, |
573 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, |
574 | &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr, |
575 | |
576 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, |
577 | &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, |
578 | &sensor_dev_attr_temp2_fault.dev_attr.attr, |
579 | &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, |
580 | &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, |
581 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
582 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
583 | &dev_attr_alarms.attr, |
584 | NULL |
585 | }; |
586 | |
587 | static const struct attribute_group lm90_group = { |
588 | .attrs = lm90_attributes, |
589 | }; |
590 | |
591 | /* pec used for ADM1032 only */ |
592 | static ssize_t show_pec(struct device *dev, struct device_attribute *dummy, |
593 | char *buf) |
594 | { |
595 | struct i2c_client *client = to_i2c_client(dev); |
596 | return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); |
597 | } |
598 | |
599 | static ssize_t set_pec(struct device *dev, struct device_attribute *dummy, |
600 | const char *buf, size_t count) |
601 | { |
602 | struct i2c_client *client = to_i2c_client(dev); |
603 | long val = simple_strtol(buf, NULL, 10); |
604 | |
605 | switch (val) { |
606 | case 0: |
607 | client->flags &= ~I2C_CLIENT_PEC; |
608 | break; |
609 | case 1: |
610 | client->flags |= I2C_CLIENT_PEC; |
611 | break; |
612 | default: |
613 | return -EINVAL; |
614 | } |
615 | |
616 | return count; |
617 | } |
618 | |
619 | static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec); |
620 | |
621 | /* |
622 | * Real code |
623 | */ |
624 | |
625 | /* The ADM1032 supports PEC but not on write byte transactions, so we need |
626 | to explicitly ask for a transaction without PEC. */ |
627 | static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value) |
628 | { |
629 | return i2c_smbus_xfer(client->adapter, client->addr, |
630 | client->flags & ~I2C_CLIENT_PEC, |
631 | I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL); |
632 | } |
633 | |
634 | /* It is assumed that client->update_lock is held (unless we are in |
635 | detection or initialization steps). This matters when PEC is enabled, |
636 | because we don't want the address pointer to change between the write |
637 | byte and the read byte transactions. */ |
638 | static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value) |
639 | { |
640 | int err; |
641 | |
642 | if (client->flags & I2C_CLIENT_PEC) { |
643 | err = adm1032_write_byte(client, reg); |
644 | if (err >= 0) |
645 | err = i2c_smbus_read_byte(client); |
646 | } else |
647 | err = i2c_smbus_read_byte_data(client, reg); |
648 | |
649 | if (err < 0) { |
650 | dev_warn(&client->dev, "Register %#02x read failed (%d)\n", |
651 | reg, err); |
652 | return err; |
653 | } |
654 | *value = err; |
655 | |
656 | return 0; |
657 | } |
658 | |
659 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
660 | static int lm90_detect(struct i2c_client *new_client, |
661 | struct i2c_board_info *info) |
662 | { |
663 | struct i2c_adapter *adapter = new_client->adapter; |
664 | int address = new_client->addr; |
665 | const char *name = NULL; |
666 | int man_id, chip_id, reg_config1, reg_convrate; |
667 | |
668 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) |
669 | return -ENODEV; |
670 | |
671 | /* detection and identification */ |
672 | if ((man_id = i2c_smbus_read_byte_data(new_client, |
673 | LM90_REG_R_MAN_ID)) < 0 |
674 | || (chip_id = i2c_smbus_read_byte_data(new_client, |
675 | LM90_REG_R_CHIP_ID)) < 0 |
676 | || (reg_config1 = i2c_smbus_read_byte_data(new_client, |
677 | LM90_REG_R_CONFIG1)) < 0 |
678 | || (reg_convrate = i2c_smbus_read_byte_data(new_client, |
679 | LM90_REG_R_CONVRATE)) < 0) |
680 | return -ENODEV; |
681 | |
682 | if ((address == 0x4C || address == 0x4D) |
683 | && man_id == 0x01) { /* National Semiconductor */ |
684 | int reg_config2; |
685 | |
686 | reg_config2 = i2c_smbus_read_byte_data(new_client, |
687 | LM90_REG_R_CONFIG2); |
688 | if (reg_config2 < 0) |
689 | return -ENODEV; |
690 | |
691 | if ((reg_config1 & 0x2A) == 0x00 |
692 | && (reg_config2 & 0xF8) == 0x00 |
693 | && reg_convrate <= 0x09) { |
694 | if (address == 0x4C |
695 | && (chip_id & 0xF0) == 0x20) { /* LM90 */ |
696 | name = "lm90"; |
697 | } else |
698 | if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */ |
699 | name = "lm99"; |
700 | dev_info(&adapter->dev, |
701 | "Assuming LM99 chip at 0x%02x\n", |
702 | address); |
703 | dev_info(&adapter->dev, |
704 | "If it is an LM89, instantiate it " |
705 | "with the new_device sysfs " |
706 | "interface\n"); |
707 | } else |
708 | if (address == 0x4C |
709 | && (chip_id & 0xF0) == 0x10) { /* LM86 */ |
710 | name = "lm86"; |
711 | } |
712 | } |
713 | } else |
714 | if ((address == 0x4C || address == 0x4D) |
715 | && man_id == 0x41) { /* Analog Devices */ |
716 | if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ |
717 | && (reg_config1 & 0x3F) == 0x00 |
718 | && reg_convrate <= 0x0A) { |
719 | name = "adm1032"; |
720 | /* The ADM1032 supports PEC, but only if combined |
721 | transactions are not used. */ |
722 | if (i2c_check_functionality(adapter, |
723 | I2C_FUNC_SMBUS_BYTE)) |
724 | info->flags |= I2C_CLIENT_PEC; |
725 | } else |
726 | if (chip_id == 0x51 /* ADT7461 */ |
727 | && (reg_config1 & 0x1B) == 0x00 |
728 | && reg_convrate <= 0x0A) { |
729 | name = "adt7461"; |
730 | } |
731 | } else |
732 | if (man_id == 0x4D) { /* Maxim */ |
733 | /* |
734 | * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id |
735 | * register. Reading from that address will return the last |
736 | * read value, which in our case is those of the man_id |
737 | * register. Likewise, the config1 register seems to lack a |
738 | * low nibble, so the value will be those of the previous |
739 | * read, so in our case those of the man_id register. |
740 | */ |
741 | if (chip_id == man_id |
742 | && (address == 0x4C || address == 0x4D) |
743 | && (reg_config1 & 0x1F) == (man_id & 0x0F) |
744 | && reg_convrate <= 0x09) { |
745 | name = "max6657"; |
746 | } else |
747 | /* |
748 | * The chip_id register of the MAX6680 and MAX6681 holds the |
749 | * revision of the chip. The lowest bit of the config1 register |
750 | * is unused and should return zero when read, so should the |
751 | * second to last bit of config1 (software reset). |
752 | */ |
753 | if (chip_id == 0x01 |
754 | && (reg_config1 & 0x03) == 0x00 |
755 | && reg_convrate <= 0x07) { |
756 | name = "max6680"; |
757 | } else |
758 | /* |
759 | * The chip_id register of the MAX6646/6647/6649 holds the |
760 | * revision of the chip. The lowest 6 bits of the config1 |
761 | * register are unused and should return zero when read. |
762 | */ |
763 | if (chip_id == 0x59 |
764 | && (reg_config1 & 0x3f) == 0x00 |
765 | && reg_convrate <= 0x07) { |
766 | name = "max6646"; |
767 | } |
768 | } else |
769 | if (address == 0x4C |
770 | && man_id == 0x5C) { /* Winbond/Nuvoton */ |
771 | if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */ |
772 | && (reg_config1 & 0x2A) == 0x00 |
773 | && reg_convrate <= 0x08) { |
774 | name = "w83l771"; |
775 | } |
776 | } |
777 | |
778 | if (!name) { /* identification failed */ |
779 | dev_dbg(&adapter->dev, |
780 | "Unsupported chip at 0x%02x (man_id=0x%02X, " |
781 | "chip_id=0x%02X)\n", address, man_id, chip_id); |
782 | return -ENODEV; |
783 | } |
784 | |
785 | strlcpy(info->type, name, I2C_NAME_SIZE); |
786 | |
787 | return 0; |
788 | } |
789 | |
790 | static int lm90_probe(struct i2c_client *new_client, |
791 | const struct i2c_device_id *id) |
792 | { |
793 | struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent); |
794 | struct lm90_data *data; |
795 | int err; |
796 | |
797 | data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL); |
798 | if (!data) { |
799 | err = -ENOMEM; |
800 | goto exit; |
801 | } |
802 | i2c_set_clientdata(new_client, data); |
803 | mutex_init(&data->update_lock); |
804 | |
805 | /* Set the device type */ |
806 | data->kind = id->driver_data; |
807 | if (data->kind == adm1032) { |
808 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE)) |
809 | new_client->flags &= ~I2C_CLIENT_PEC; |
810 | } |
811 | |
812 | /* Different devices have different alarm bits triggering the |
813 | * ALERT# output */ |
814 | switch (data->kind) { |
815 | case lm90: |
816 | case lm99: |
817 | case lm86: |
818 | data->alert_alarms = 0x7b; |
819 | break; |
820 | default: |
821 | data->alert_alarms = 0x7c; |
822 | break; |
823 | } |
824 | |
825 | /* Initialize the LM90 chip */ |
826 | lm90_init_client(new_client); |
827 | |
828 | /* Register sysfs hooks */ |
829 | if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group))) |
830 | goto exit_free; |
831 | if (new_client->flags & I2C_CLIENT_PEC) { |
832 | if ((err = device_create_file(&new_client->dev, |
833 | &dev_attr_pec))) |
834 | goto exit_remove_files; |
835 | } |
836 | if (data->kind != max6657 && data->kind != max6646) { |
837 | if ((err = device_create_file(&new_client->dev, |
838 | &sensor_dev_attr_temp2_offset.dev_attr))) |
839 | goto exit_remove_files; |
840 | } |
841 | |
842 | data->hwmon_dev = hwmon_device_register(&new_client->dev); |
843 | if (IS_ERR(data->hwmon_dev)) { |
844 | err = PTR_ERR(data->hwmon_dev); |
845 | goto exit_remove_files; |
846 | } |
847 | |
848 | return 0; |
849 | |
850 | exit_remove_files: |
851 | sysfs_remove_group(&new_client->dev.kobj, &lm90_group); |
852 | device_remove_file(&new_client->dev, &dev_attr_pec); |
853 | exit_free: |
854 | kfree(data); |
855 | exit: |
856 | return err; |
857 | } |
858 | |
859 | static void lm90_init_client(struct i2c_client *client) |
860 | { |
861 | u8 config; |
862 | struct lm90_data *data = i2c_get_clientdata(client); |
863 | |
864 | /* |
865 | * Start the conversions. |
866 | */ |
867 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, |
868 | 5); /* 2 Hz */ |
869 | if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) { |
870 | dev_warn(&client->dev, "Initialization failed!\n"); |
871 | return; |
872 | } |
873 | data->config_orig = config; |
874 | |
875 | /* Check Temperature Range Select */ |
876 | if (data->kind == adt7461) { |
877 | if (config & 0x04) |
878 | data->flags |= LM90_FLAG_ADT7461_EXT; |
879 | } |
880 | |
881 | /* |
882 | * Put MAX6680/MAX8881 into extended resolution (bit 0x10, |
883 | * 0.125 degree resolution) and range (0x08, extend range |
884 | * to -64 degree) mode for the remote temperature sensor. |
885 | */ |
886 | if (data->kind == max6680) { |
887 | config |= 0x18; |
888 | } |
889 | |
890 | config &= 0xBF; /* run */ |
891 | if (config != data->config_orig) /* Only write if changed */ |
892 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config); |
893 | } |
894 | |
895 | static int lm90_remove(struct i2c_client *client) |
896 | { |
897 | struct lm90_data *data = i2c_get_clientdata(client); |
898 | |
899 | hwmon_device_unregister(data->hwmon_dev); |
900 | sysfs_remove_group(&client->dev.kobj, &lm90_group); |
901 | device_remove_file(&client->dev, &dev_attr_pec); |
902 | if (data->kind != max6657 && data->kind != max6646) |
903 | device_remove_file(&client->dev, |
904 | &sensor_dev_attr_temp2_offset.dev_attr); |
905 | |
906 | /* Restore initial configuration */ |
907 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, |
908 | data->config_orig); |
909 | |
910 | kfree(data); |
911 | return 0; |
912 | } |
913 | |
914 | static void lm90_alert(struct i2c_client *client, unsigned int flag) |
915 | { |
916 | struct lm90_data *data = i2c_get_clientdata(client); |
917 | u8 config, alarms; |
918 | |
919 | lm90_read_reg(client, LM90_REG_R_STATUS, &alarms); |
920 | if ((alarms & 0x7f) == 0) { |
921 | dev_info(&client->dev, "Everything OK\n"); |
922 | } else { |
923 | if (alarms & 0x61) |
924 | dev_warn(&client->dev, |
925 | "temp%d out of range, please check!\n", 1); |
926 | if (alarms & 0x1a) |
927 | dev_warn(&client->dev, |
928 | "temp%d out of range, please check!\n", 2); |
929 | if (alarms & 0x04) |
930 | dev_warn(&client->dev, |
931 | "temp%d diode open, please check!\n", 2); |
932 | |
933 | /* Disable ALERT# output, because these chips don't implement |
934 | SMBus alert correctly; they should only hold the alert line |
935 | low briefly. */ |
936 | if ((data->kind == adm1032 || data->kind == adt7461) |
937 | && (alarms & data->alert_alarms)) { |
938 | dev_dbg(&client->dev, "Disabling ALERT#\n"); |
939 | lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); |
940 | i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, |
941 | config | 0x80); |
942 | } |
943 | } |
944 | } |
945 | |
946 | static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value) |
947 | { |
948 | int err; |
949 | u8 oldh, newh, l; |
950 | |
951 | /* |
952 | * There is a trick here. We have to read two registers to have the |
953 | * sensor temperature, but we have to beware a conversion could occur |
954 | * inbetween the readings. The datasheet says we should either use |
955 | * the one-shot conversion register, which we don't want to do |
956 | * (disables hardware monitoring) or monitor the busy bit, which is |
957 | * impossible (we can't read the values and monitor that bit at the |
958 | * exact same time). So the solution used here is to read the high |
959 | * byte once, then the low byte, then the high byte again. If the new |
960 | * high byte matches the old one, then we have a valid reading. Else |
961 | * we have to read the low byte again, and now we believe we have a |
962 | * correct reading. |
963 | */ |
964 | if ((err = lm90_read_reg(client, regh, &oldh)) |
965 | || (err = lm90_read_reg(client, regl, &l)) |
966 | || (err = lm90_read_reg(client, regh, &newh))) |
967 | return err; |
968 | if (oldh != newh) { |
969 | err = lm90_read_reg(client, regl, &l); |
970 | if (err) |
971 | return err; |
972 | } |
973 | *value = (newh << 8) | l; |
974 | |
975 | return 0; |
976 | } |
977 | |
978 | static struct lm90_data *lm90_update_device(struct device *dev) |
979 | { |
980 | struct i2c_client *client = to_i2c_client(dev); |
981 | struct lm90_data *data = i2c_get_clientdata(client); |
982 | |
983 | mutex_lock(&data->update_lock); |
984 | |
985 | if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) { |
986 | u8 h, l; |
987 | |
988 | dev_dbg(&client->dev, "Updating lm90 data.\n"); |
989 | lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]); |
990 | lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]); |
991 | lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]); |
992 | lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]); |
993 | lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst); |
994 | |
995 | if (data->kind == max6657 || data->kind == max6646) { |
996 | lm90_read16(client, LM90_REG_R_LOCAL_TEMP, |
997 | MAX6657_REG_R_LOCAL_TEMPL, |
998 | &data->temp11[4]); |
999 | } else { |
1000 | if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, |
1001 | &h) == 0) |
1002 | data->temp11[4] = h << 8; |
1003 | } |
1004 | lm90_read16(client, LM90_REG_R_REMOTE_TEMPH, |
1005 | LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]); |
1006 | |
1007 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) { |
1008 | data->temp11[1] = h << 8; |
1009 | if (data->kind != max6657 && data->kind != max6680 |
1010 | && data->kind != max6646 |
1011 | && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, |
1012 | &l) == 0) |
1013 | data->temp11[1] |= l; |
1014 | } |
1015 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) { |
1016 | data->temp11[2] = h << 8; |
1017 | if (data->kind != max6657 && data->kind != max6680 |
1018 | && data->kind != max6646 |
1019 | && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, |
1020 | &l) == 0) |
1021 | data->temp11[2] |= l; |
1022 | } |
1023 | |
1024 | if (data->kind != max6657 && data->kind != max6646) { |
1025 | if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH, |
1026 | &h) == 0 |
1027 | && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL, |
1028 | &l) == 0) |
1029 | data->temp11[3] = (h << 8) | l; |
1030 | } |
1031 | lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms); |
1032 | |
1033 | /* Re-enable ALERT# output if it was originally enabled and |
1034 | * relevant alarms are all clear */ |
1035 | if ((data->config_orig & 0x80) == 0 |
1036 | && (data->alarms & data->alert_alarms) == 0) { |
1037 | u8 config; |
1038 | |
1039 | lm90_read_reg(client, LM90_REG_R_CONFIG1, &config); |
1040 | if (config & 0x80) { |
1041 | dev_dbg(&client->dev, "Re-enabling ALERT#\n"); |
1042 | i2c_smbus_write_byte_data(client, |
1043 | LM90_REG_W_CONFIG1, |
1044 | config & ~0x80); |
1045 | } |
1046 | } |
1047 | |
1048 | data->last_updated = jiffies; |
1049 | data->valid = 1; |
1050 | } |
1051 | |
1052 | mutex_unlock(&data->update_lock); |
1053 | |
1054 | return data; |
1055 | } |
1056 | |
1057 | static int __init sensors_lm90_init(void) |
1058 | { |
1059 | return i2c_add_driver(&lm90_driver); |
1060 | } |
1061 | |
1062 | static void __exit sensors_lm90_exit(void) |
1063 | { |
1064 | i2c_del_driver(&lm90_driver); |
1065 | } |
1066 | |
1067 | MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); |
1068 | MODULE_DESCRIPTION("LM90/ADM1032 driver"); |
1069 | MODULE_LICENSE("GPL"); |
1070 | |
1071 | module_init(sensors_lm90_init); |
1072 | module_exit(sensors_lm90_exit); |
1073 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9