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sched_clock: Disable seqlock lockdep usage in sched_clock()
[linux-2.6/btrfs-unstable.git] / drivers / hwmon / lm90.c
blob8b8f3aa49726873b89267ebe45f4e145eab2c7bb
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. We use the device address to detect MAX6659, which will result
32 * in a detection as max6657 if it is on address 0x4c. The extra address
33 * and features of the MAX6659 are only supported if the chip is configured
34 * explicitly as max6659, or if its address is not 0x4c.
35 * These chips lack the remote temperature offset feature.
36 *
37 * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
38 * MAX6692 chips made by Maxim. These are again similar to the LM86,
39 * but they use unsigned temperature values and can report temperatures
40 * from 0 to 145 degrees.
41 *
42 * This driver also supports the MAX6680 and MAX6681, two other sensor
43 * chips made by Maxim. These are quite similar to the other Maxim
44 * chips. The MAX6680 and MAX6681 only differ in the pinout so they can
45 * be treated identically.
46 *
47 * This driver also supports the MAX6695 and MAX6696, two other sensor
48 * chips made by Maxim. These are also quite similar to other Maxim
49 * chips, but support three temperature sensors instead of two. MAX6695
50 * and MAX6696 only differ in the pinout so they can be treated identically.
51 *
52 * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
53 * NCT1008 from ON Semiconductor. The chips are supported in both compatibility
54 * and extended mode. They are mostly compatible with LM90 except for a data
55 * format difference for the temperature value registers.
56 *
57 * This driver also supports the SA56004 from Philips. This device is
58 * pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
59 *
60 * This driver also supports the G781 from GMT. This device is compatible
61 * with the ADM1032.
62 *
63 * This driver also supports TMP451 from Texas Instruments. This device is
64 * supported in both compatibility and extended mode. It's mostly compatible
65 * with ADT7461 except for local temperature low byte register and max
66 * conversion rate.
67 *
68 * Since the LM90 was the first chipset supported by this driver, most
69 * comments will refer to this chipset, but are actually general and
70 * concern all supported chipsets, unless mentioned otherwise.
71 *
72 * This program is free software; you can redistribute it and/or modify
73 * it under the terms of the GNU General Public License as published by
74 * the Free Software Foundation; either version 2 of the License, or
75 * (at your option) any later version.
76 *
77 * This program is distributed in the hope that it will be useful,
78 * but WITHOUT ANY WARRANTY; without even the implied warranty of
79 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
80 * GNU General Public License for more details.
81 *
82 * You should have received a copy of the GNU General Public License
83 * along with this program; if not, write to the Free Software
84 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
85 */
86
87 #include <linux/module.h>
88 #include <linux/init.h>
89 #include <linux/slab.h>
90 #include <linux/jiffies.h>
91 #include <linux/i2c.h>
92 #include <linux/hwmon-sysfs.h>
93 #include <linux/hwmon.h>
94 #include <linux/err.h>
95 #include <linux/mutex.h>
96 #include <linux/sysfs.h>
97 #include <linux/interrupt.h>
98 #include <linux/regulator/consumer.h>
99
100 /*
101 * Addresses to scan
102 * Address is fully defined internally and cannot be changed except for
103 * MAX6659, MAX6680 and MAX6681.
104 * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
105 * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
106 * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
107 * have address 0x4d.
108 * MAX6647 has address 0x4e.
109 * MAX6659 can have address 0x4c, 0x4d or 0x4e.
110 * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
111 * 0x4c, 0x4d or 0x4e.
112 * SA56004 can have address 0x48 through 0x4F.
113 */
114
115 static const unsigned short normal_i2c[] = {
116 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
117 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
118
119 enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
120 max6646, w83l771, max6696, sa56004, g781, tmp451 };
121
122 /*
123 * The LM90 registers
124 */
125
126 #define LM90_REG_R_MAN_ID 0xFE
127 #define LM90_REG_R_CHIP_ID 0xFF
128 #define LM90_REG_R_CONFIG1 0x03
129 #define LM90_REG_W_CONFIG1 0x09
130 #define LM90_REG_R_CONFIG2 0xBF
131 #define LM90_REG_W_CONFIG2 0xBF
132 #define LM90_REG_R_CONVRATE 0x04
133 #define LM90_REG_W_CONVRATE 0x0A
134 #define LM90_REG_R_STATUS 0x02
135 #define LM90_REG_R_LOCAL_TEMP 0x00
136 #define LM90_REG_R_LOCAL_HIGH 0x05
137 #define LM90_REG_W_LOCAL_HIGH 0x0B
138 #define LM90_REG_R_LOCAL_LOW 0x06
139 #define LM90_REG_W_LOCAL_LOW 0x0C
140 #define LM90_REG_R_LOCAL_CRIT 0x20
141 #define LM90_REG_W_LOCAL_CRIT 0x20
142 #define LM90_REG_R_REMOTE_TEMPH 0x01
143 #define LM90_REG_R_REMOTE_TEMPL 0x10
144 #define LM90_REG_R_REMOTE_OFFSH 0x11
145 #define LM90_REG_W_REMOTE_OFFSH 0x11
146 #define LM90_REG_R_REMOTE_OFFSL 0x12
147 #define LM90_REG_W_REMOTE_OFFSL 0x12
148 #define LM90_REG_R_REMOTE_HIGHH 0x07
149 #define LM90_REG_W_REMOTE_HIGHH 0x0D
150 #define LM90_REG_R_REMOTE_HIGHL 0x13
151 #define LM90_REG_W_REMOTE_HIGHL 0x13
152 #define LM90_REG_R_REMOTE_LOWH 0x08
153 #define LM90_REG_W_REMOTE_LOWH 0x0E
154 #define LM90_REG_R_REMOTE_LOWL 0x14
155 #define LM90_REG_W_REMOTE_LOWL 0x14
156 #define LM90_REG_R_REMOTE_CRIT 0x19
157 #define LM90_REG_W_REMOTE_CRIT 0x19
158 #define LM90_REG_R_TCRIT_HYST 0x21
159 #define LM90_REG_W_TCRIT_HYST 0x21
160
161 /* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */
162
163 #define MAX6657_REG_R_LOCAL_TEMPL 0x11
164 #define MAX6696_REG_R_STATUS2 0x12
165 #define MAX6659_REG_R_REMOTE_EMERG 0x16
166 #define MAX6659_REG_W_REMOTE_EMERG 0x16
167 #define MAX6659_REG_R_LOCAL_EMERG 0x17
168 #define MAX6659_REG_W_LOCAL_EMERG 0x17
169
170 /* SA56004 registers */
171
172 #define SA56004_REG_R_LOCAL_TEMPL 0x22
173
174 #define LM90_DEF_CONVRATE_RVAL 6 /* Def conversion rate register value */
175 #define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */
176
177 /* TMP451 registers */
178 #define TMP451_REG_R_LOCAL_TEMPL 0x15
179
180 /*
181 * Device flags
182 */
183 #define LM90_FLAG_ADT7461_EXT (1 << 0) /* ADT7461 extended mode */
184 /* Device features */
185 #define LM90_HAVE_OFFSET (1 << 1) /* temperature offset register */
186 #define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */
187 #define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */
188 #define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
189 #define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
190 #define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
191
192 /* LM90 status */
193 #define LM90_STATUS_LTHRM (1 << 0) /* local THERM limit tripped */
194 #define LM90_STATUS_RTHRM (1 << 1) /* remote THERM limit tripped */
195 #define LM90_STATUS_ROPEN (1 << 2) /* remote is an open circuit */
196 #define LM90_STATUS_RLOW (1 << 3) /* remote low temp limit tripped */
197 #define LM90_STATUS_RHIGH (1 << 4) /* remote high temp limit tripped */
198 #define LM90_STATUS_LLOW (1 << 5) /* local low temp limit tripped */
199 #define LM90_STATUS_LHIGH (1 << 6) /* local high temp limit tripped */
200
201 #define MAX6696_STATUS2_R2THRM (1 << 1) /* remote2 THERM limit tripped */
202 #define MAX6696_STATUS2_R2OPEN (1 << 2) /* remote2 is an open circuit */
203 #define MAX6696_STATUS2_R2LOW (1 << 3) /* remote2 low temp limit tripped */
204 #define MAX6696_STATUS2_R2HIGH (1 << 4) /* remote2 high temp limit tripped */
205 #define MAX6696_STATUS2_ROT2 (1 << 5) /* remote emergency limit tripped */
206 #define MAX6696_STATUS2_R2OT2 (1 << 6) /* remote2 emergency limit tripped */
207 #define MAX6696_STATUS2_LOT2 (1 << 7) /* local emergency limit tripped */
208
209 /*
210 * Driver data (common to all clients)
211 */
212
213 static const struct i2c_device_id lm90_id[] = {
214 { "adm1032", adm1032 },
215 { "adt7461", adt7461 },
216 { "adt7461a", adt7461 },
217 { "g781", g781 },
218 { "lm90", lm90 },
219 { "lm86", lm86 },
220 { "lm89", lm86 },
221 { "lm99", lm99 },
222 { "max6646", max6646 },
223 { "max6647", max6646 },
224 { "max6649", max6646 },
225 { "max6657", max6657 },
226 { "max6658", max6657 },
227 { "max6659", max6659 },
228 { "max6680", max6680 },
229 { "max6681", max6680 },
230 { "max6695", max6696 },
231 { "max6696", max6696 },
232 { "nct1008", adt7461 },
233 { "w83l771", w83l771 },
234 { "sa56004", sa56004 },
235 { "tmp451", tmp451 },
236 { }
237 };
238 MODULE_DEVICE_TABLE(i2c, lm90_id);
239
240 /*
241 * chip type specific parameters
242 */
243 struct lm90_params {
244 u32 flags; /* Capabilities */
245 u16 alert_alarms; /* Which alarm bits trigger ALERT# */
246 /* Upper 8 bits for max6695/96 */
247 u8 max_convrate; /* Maximum conversion rate register value */
248 u8 reg_local_ext; /* Extended local temp register (optional) */
249 };
250
251 static const struct lm90_params lm90_params[] = {
252 [adm1032] = {
253 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
254 | LM90_HAVE_BROKEN_ALERT,
255 .alert_alarms = 0x7c,
256 .max_convrate = 10,
257 },
258 [adt7461] = {
259 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
260 | LM90_HAVE_BROKEN_ALERT,
261 .alert_alarms = 0x7c,
262 .max_convrate = 10,
263 },
264 [g781] = {
265 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
266 | LM90_HAVE_BROKEN_ALERT,
267 .alert_alarms = 0x7c,
268 .max_convrate = 8,
269 },
270 [lm86] = {
271 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
272 .alert_alarms = 0x7b,
273 .max_convrate = 9,
274 },
275 [lm90] = {
276 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
277 .alert_alarms = 0x7b,
278 .max_convrate = 9,
279 },
280 [lm99] = {
281 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
282 .alert_alarms = 0x7b,
283 .max_convrate = 9,
284 },
285 [max6646] = {
286 .alert_alarms = 0x7c,
287 .max_convrate = 6,
288 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
289 },
290 [max6657] = {
291 .alert_alarms = 0x7c,
292 .max_convrate = 8,
293 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
294 },
295 [max6659] = {
296 .flags = LM90_HAVE_EMERGENCY,
297 .alert_alarms = 0x7c,
298 .max_convrate = 8,
299 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
300 },
301 [max6680] = {
302 .flags = LM90_HAVE_OFFSET,
303 .alert_alarms = 0x7c,
304 .max_convrate = 7,
305 },
306 [max6696] = {
307 .flags = LM90_HAVE_EMERGENCY
308 | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3,
309 .alert_alarms = 0x1c7c,
310 .max_convrate = 6,
311 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
312 },
313 [w83l771] = {
314 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
315 .alert_alarms = 0x7c,
316 .max_convrate = 8,
317 },
318 [sa56004] = {
319 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
320 .alert_alarms = 0x7b,
321 .max_convrate = 9,
322 .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
323 },
324 [tmp451] = {
325 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
326 | LM90_HAVE_BROKEN_ALERT,
327 .alert_alarms = 0x7c,
328 .max_convrate = 9,
329 .reg_local_ext = TMP451_REG_R_LOCAL_TEMPL,
330 }
331 };
332
333 /*
334 * TEMP8 register index
335 */
336 enum lm90_temp8_reg_index {
337 LOCAL_LOW = 0,
338 LOCAL_HIGH,
339 LOCAL_CRIT,
340 REMOTE_CRIT,
341 LOCAL_EMERG, /* max6659 and max6695/96 */
342 REMOTE_EMERG, /* max6659 and max6695/96 */
343 REMOTE2_CRIT, /* max6695/96 only */
344 REMOTE2_EMERG, /* max6695/96 only */
345 TEMP8_REG_NUM
346 };
347
348 /*
349 * TEMP11 register index
350 */
351 enum lm90_temp11_reg_index {
352 REMOTE_TEMP = 0,
353 REMOTE_LOW,
354 REMOTE_HIGH,
355 REMOTE_OFFSET, /* except max6646, max6657/58/59, and max6695/96 */
356 LOCAL_TEMP,
357 REMOTE2_TEMP, /* max6695/96 only */
358 REMOTE2_LOW, /* max6695/96 only */
359 REMOTE2_HIGH, /* max6695/96 only */
360 TEMP11_REG_NUM
361 };
362
363 /*
364 * Client data (each client gets its own)
365 */
366
367 struct lm90_data {
368 struct device *hwmon_dev;
369 struct mutex update_lock;
370 struct regulator *regulator;
371 char valid; /* zero until following fields are valid */
372 unsigned long last_updated; /* in jiffies */
373 int kind;
374 u32 flags;
375
376 int update_interval; /* in milliseconds */
377
378 u8 config_orig; /* Original configuration register value */
379 u8 convrate_orig; /* Original conversion rate register value */
380 u16 alert_alarms; /* Which alarm bits trigger ALERT# */
381 /* Upper 8 bits for max6695/96 */
382 u8 max_convrate; /* Maximum conversion rate */
383 u8 reg_local_ext; /* local extension register offset */
384
385 /* registers values */
386 s8 temp8[TEMP8_REG_NUM];
387 s16 temp11[TEMP11_REG_NUM];
388 u8 temp_hyst;
389 u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
390 };
391
392 /*
393 * Support functions
394 */
395
396 /*
397 * The ADM1032 supports PEC but not on write byte transactions, so we need
398 * to explicitly ask for a transaction without PEC.
399 */
400 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
401 {
402 return i2c_smbus_xfer(client->adapter, client->addr,
403 client->flags & ~I2C_CLIENT_PEC,
404 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
405 }
406
407 /*
408 * It is assumed that client->update_lock is held (unless we are in
409 * detection or initialization steps). This matters when PEC is enabled,
410 * because we don't want the address pointer to change between the write
411 * byte and the read byte transactions.
412 */
413 static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
414 {
415 int err;
416
417 if (client->flags & I2C_CLIENT_PEC) {
418 err = adm1032_write_byte(client, reg);
419 if (err >= 0)
420 err = i2c_smbus_read_byte(client);
421 } else
422 err = i2c_smbus_read_byte_data(client, reg);
423
424 if (err < 0) {
425 dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
426 reg, err);
427 return err;
428 }
429 *value = err;
430
431 return 0;
432 }
433
434 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
435 {
436 int err;
437 u8 oldh, newh, l;
438
439 /*
440 * There is a trick here. We have to read two registers to have the
441 * sensor temperature, but we have to beware a conversion could occur
442 * between the readings. The datasheet says we should either use
443 * the one-shot conversion register, which we don't want to do
444 * (disables hardware monitoring) or monitor the busy bit, which is
445 * impossible (we can't read the values and monitor that bit at the
446 * exact same time). So the solution used here is to read the high
447 * byte once, then the low byte, then the high byte again. If the new
448 * high byte matches the old one, then we have a valid reading. Else
449 * we have to read the low byte again, and now we believe we have a
450 * correct reading.
451 */
452 if ((err = lm90_read_reg(client, regh, &oldh))
453 || (err = lm90_read_reg(client, regl, &l))
454 || (err = lm90_read_reg(client, regh, &newh)))
455 return err;
456 if (oldh != newh) {
457 err = lm90_read_reg(client, regl, &l);
458 if (err)
459 return err;
460 }
461 *value = (newh << 8) | l;
462
463 return 0;
464 }
465
466 /*
467 * client->update_lock must be held when calling this function (unless we are
468 * in detection or initialization steps), and while a remote channel other
469 * than channel 0 is selected. Also, calling code must make sure to re-select
470 * external channel 0 before releasing the lock. This is necessary because
471 * various registers have different meanings as a result of selecting a
472 * non-default remote channel.
473 */
474 static inline void lm90_select_remote_channel(struct i2c_client *client,
475 struct lm90_data *data,
476 int channel)
477 {
478 u8 config;
479
480 if (data->kind == max6696) {
481 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
482 config &= ~0x08;
483 if (channel)
484 config |= 0x08;
485 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
486 config);
487 }
488 }
489
490 /*
491 * Set conversion rate.
492 * client->update_lock must be held when calling this function (unless we are
493 * in detection or initialization steps).
494 */
495 static void lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
496 unsigned int interval)
497 {
498 int i;
499 unsigned int update_interval;
500
501 /* Shift calculations to avoid rounding errors */
502 interval <<= 6;
503
504 /* find the nearest update rate */
505 for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
506 i < data->max_convrate; i++, update_interval >>= 1)
507 if (interval >= update_interval * 3 / 4)
508 break;
509
510 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i);
511 data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
512 }
513
514 static struct lm90_data *lm90_update_device(struct device *dev)
515 {
516 struct i2c_client *client = to_i2c_client(dev);
517 struct lm90_data *data = i2c_get_clientdata(client);
518 unsigned long next_update;
519
520 mutex_lock(&data->update_lock);
521
522 next_update = data->last_updated +
523 msecs_to_jiffies(data->update_interval);
524 if (time_after(jiffies, next_update) || !data->valid) {
525 u8 h, l;
526 u8 alarms;
527
528 dev_dbg(&client->dev, "Updating lm90 data.\n");
529 lm90_read_reg(client, LM90_REG_R_LOCAL_LOW,
530 &data->temp8[LOCAL_LOW]);
531 lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH,
532 &data->temp8[LOCAL_HIGH]);
533 lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT,
534 &data->temp8[LOCAL_CRIT]);
535 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
536 &data->temp8[REMOTE_CRIT]);
537 lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
538
539 if (data->reg_local_ext) {
540 lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
541 data->reg_local_ext,
542 &data->temp11[LOCAL_TEMP]);
543 } else {
544 if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
545 &h) == 0)
546 data->temp11[LOCAL_TEMP] = h << 8;
547 }
548 lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
549 LM90_REG_R_REMOTE_TEMPL,
550 &data->temp11[REMOTE_TEMP]);
551
552 if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
553 data->temp11[REMOTE_LOW] = h << 8;
554 if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
555 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
556 &l) == 0)
557 data->temp11[REMOTE_LOW] |= l;
558 }
559 if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
560 data->temp11[REMOTE_HIGH] = h << 8;
561 if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
562 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
563 &l) == 0)
564 data->temp11[REMOTE_HIGH] |= l;
565 }
566
567 if (data->flags & LM90_HAVE_OFFSET) {
568 if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
569 &h) == 0
570 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
571 &l) == 0)
572 data->temp11[REMOTE_OFFSET] = (h << 8) | l;
573 }
574 if (data->flags & LM90_HAVE_EMERGENCY) {
575 lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
576 &data->temp8[LOCAL_EMERG]);
577 lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
578 &data->temp8[REMOTE_EMERG]);
579 }
580 lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
581 data->alarms = alarms; /* save as 16 bit value */
582
583 if (data->kind == max6696) {
584 lm90_select_remote_channel(client, data, 1);
585 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
586 &data->temp8[REMOTE2_CRIT]);
587 lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
588 &data->temp8[REMOTE2_EMERG]);
589 lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
590 LM90_REG_R_REMOTE_TEMPL,
591 &data->temp11[REMOTE2_TEMP]);
592 if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
593 data->temp11[REMOTE2_LOW] = h << 8;
594 if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
595 data->temp11[REMOTE2_HIGH] = h << 8;
596 lm90_select_remote_channel(client, data, 0);
597
598 if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
599 &alarms))
600 data->alarms |= alarms << 8;
601 }
602
603 /*
604 * Re-enable ALERT# output if it was originally enabled and
605 * relevant alarms are all clear
606 */
607 if ((data->config_orig & 0x80) == 0
608 && (data->alarms & data->alert_alarms) == 0) {
609 u8 config;
610
611 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
612 if (config & 0x80) {
613 dev_dbg(&client->dev, "Re-enabling ALERT#\n");
614 i2c_smbus_write_byte_data(client,
615 LM90_REG_W_CONFIG1,
616 config & ~0x80);
617 }
618 }
619
620 data->last_updated = jiffies;
621 data->valid = 1;
622 }
623
624 mutex_unlock(&data->update_lock);
625
626 return data;
627 }
628
629 /*
630 * Conversions
631 * For local temperatures and limits, critical limits and the hysteresis
632 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
633 * For remote temperatures and limits, it uses signed 11-bit values with
634 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some
635 * Maxim chips use unsigned values.
636 */
637
638 static inline int temp_from_s8(s8 val)
639 {
640 return val * 1000;
641 }
642
643 static inline int temp_from_u8(u8 val)
644 {
645 return val * 1000;
646 }
647
648 static inline int temp_from_s16(s16 val)
649 {
650 return val / 32 * 125;
651 }
652
653 static inline int temp_from_u16(u16 val)
654 {
655 return val / 32 * 125;
656 }
657
658 static s8 temp_to_s8(long val)
659 {
660 if (val <= -128000)
661 return -128;
662 if (val >= 127000)
663 return 127;
664 if (val < 0)
665 return (val - 500) / 1000;
666 return (val + 500) / 1000;
667 }
668
669 static u8 temp_to_u8(long val)
670 {
671 if (val <= 0)
672 return 0;
673 if (val >= 255000)
674 return 255;
675 return (val + 500) / 1000;
676 }
677
678 static s16 temp_to_s16(long val)
679 {
680 if (val <= -128000)
681 return 0x8000;
682 if (val >= 127875)
683 return 0x7FE0;
684 if (val < 0)
685 return (val - 62) / 125 * 32;
686 return (val + 62) / 125 * 32;
687 }
688
689 static u8 hyst_to_reg(long val)
690 {
691 if (val <= 0)
692 return 0;
693 if (val >= 30500)
694 return 31;
695 return (val + 500) / 1000;
696 }
697
698 /*
699 * ADT7461 in compatibility mode is almost identical to LM90 except that
700 * attempts to write values that are outside the range 0 < temp < 127 are
701 * treated as the boundary value.
702 *
703 * ADT7461 in "extended mode" operation uses unsigned integers offset by
704 * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC.
705 */
706 static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
707 {
708 if (data->flags & LM90_FLAG_ADT7461_EXT)
709 return (val - 64) * 1000;
710 else
711 return temp_from_s8(val);
712 }
713
714 static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
715 {
716 if (data->flags & LM90_FLAG_ADT7461_EXT)
717 return (val - 0x4000) / 64 * 250;
718 else
719 return temp_from_s16(val);
720 }
721
722 static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
723 {
724 if (data->flags & LM90_FLAG_ADT7461_EXT) {
725 if (val <= -64000)
726 return 0;
727 if (val >= 191000)
728 return 0xFF;
729 return (val + 500 + 64000) / 1000;
730 } else {
731 if (val <= 0)
732 return 0;
733 if (val >= 127000)
734 return 127;
735 return (val + 500) / 1000;
736 }
737 }
738
739 static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
740 {
741 if (data->flags & LM90_FLAG_ADT7461_EXT) {
742 if (val <= -64000)
743 return 0;
744 if (val >= 191750)
745 return 0xFFC0;
746 return (val + 64000 + 125) / 250 * 64;
747 } else {
748 if (val <= 0)
749 return 0;
750 if (val >= 127750)
751 return 0x7FC0;
752 return (val + 125) / 250 * 64;
753 }
754 }
755
756 /*
757 * Sysfs stuff
758 */
759
760 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
761 char *buf)
762 {
763 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
764 struct lm90_data *data = lm90_update_device(dev);
765 int temp;
766
767 if (data->kind == adt7461 || data->kind == tmp451)
768 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
769 else if (data->kind == max6646)
770 temp = temp_from_u8(data->temp8[attr->index]);
771 else
772 temp = temp_from_s8(data->temp8[attr->index]);
773
774 /* +16 degrees offset for temp2 for the LM99 */
775 if (data->kind == lm99 && attr->index == 3)
776 temp += 16000;
777
778 return sprintf(buf, "%d\n", temp);
779 }
780
781 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
782 const char *buf, size_t count)
783 {
784 static const u8 reg[TEMP8_REG_NUM] = {
785 LM90_REG_W_LOCAL_LOW,
786 LM90_REG_W_LOCAL_HIGH,
787 LM90_REG_W_LOCAL_CRIT,
788 LM90_REG_W_REMOTE_CRIT,
789 MAX6659_REG_W_LOCAL_EMERG,
790 MAX6659_REG_W_REMOTE_EMERG,
791 LM90_REG_W_REMOTE_CRIT,
792 MAX6659_REG_W_REMOTE_EMERG,
793 };
794
795 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
796 struct i2c_client *client = to_i2c_client(dev);
797 struct lm90_data *data = i2c_get_clientdata(client);
798 int nr = attr->index;
799 long val;
800 int err;
801
802 err = kstrtol(buf, 10, &val);
803 if (err < 0)
804 return err;
805
806 /* +16 degrees offset for temp2 for the LM99 */
807 if (data->kind == lm99 && attr->index == 3)
808 val -= 16000;
809
810 mutex_lock(&data->update_lock);
811 if (data->kind == adt7461 || data->kind == tmp451)
812 data->temp8[nr] = temp_to_u8_adt7461(data, val);
813 else if (data->kind == max6646)
814 data->temp8[nr] = temp_to_u8(val);
815 else
816 data->temp8[nr] = temp_to_s8(val);
817
818 lm90_select_remote_channel(client, data, nr >= 6);
819 i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
820 lm90_select_remote_channel(client, data, 0);
821
822 mutex_unlock(&data->update_lock);
823 return count;
824 }
825
826 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
827 char *buf)
828 {
829 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
830 struct lm90_data *data = lm90_update_device(dev);
831 int temp;
832
833 if (data->kind == adt7461 || data->kind == tmp451)
834 temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
835 else if (data->kind == max6646)
836 temp = temp_from_u16(data->temp11[attr->index]);
837 else
838 temp = temp_from_s16(data->temp11[attr->index]);
839
840 /* +16 degrees offset for temp2 for the LM99 */
841 if (data->kind == lm99 && attr->index <= 2)
842 temp += 16000;
843
844 return sprintf(buf, "%d\n", temp);
845 }
846
847 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
848 const char *buf, size_t count)
849 {
850 struct {
851 u8 high;
852 u8 low;
853 int channel;
854 } reg[5] = {
855 { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 },
856 { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 },
857 { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 },
858 { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 1 },
859 { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 1 }
860 };
861
862 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
863 struct i2c_client *client = to_i2c_client(dev);
864 struct lm90_data *data = i2c_get_clientdata(client);
865 int nr = attr->nr;
866 int index = attr->index;
867 long val;
868 int err;
869
870 err = kstrtol(buf, 10, &val);
871 if (err < 0)
872 return err;
873
874 /* +16 degrees offset for temp2 for the LM99 */
875 if (data->kind == lm99 && index <= 2)
876 val -= 16000;
877
878 mutex_lock(&data->update_lock);
879 if (data->kind == adt7461 || data->kind == tmp451)
880 data->temp11[index] = temp_to_u16_adt7461(data, val);
881 else if (data->kind == max6646)
882 data->temp11[index] = temp_to_u8(val) << 8;
883 else if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
884 data->temp11[index] = temp_to_s16(val);
885 else
886 data->temp11[index] = temp_to_s8(val) << 8;
887
888 lm90_select_remote_channel(client, data, reg[nr].channel);
889 i2c_smbus_write_byte_data(client, reg[nr].high,
890 data->temp11[index] >> 8);
891 if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
892 i2c_smbus_write_byte_data(client, reg[nr].low,
893 data->temp11[index] & 0xff);
894 lm90_select_remote_channel(client, data, 0);
895
896 mutex_unlock(&data->update_lock);
897 return count;
898 }
899
900 static ssize_t show_temphyst(struct device *dev,
901 struct device_attribute *devattr,
902 char *buf)
903 {
904 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
905 struct lm90_data *data = lm90_update_device(dev);
906 int temp;
907
908 if (data->kind == adt7461 || data->kind == tmp451)
909 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
910 else if (data->kind == max6646)
911 temp = temp_from_u8(data->temp8[attr->index]);
912 else
913 temp = temp_from_s8(data->temp8[attr->index]);
914
915 /* +16 degrees offset for temp2 for the LM99 */
916 if (data->kind == lm99 && attr->index == 3)
917 temp += 16000;
918
919 return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst));
920 }
921
922 static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
923 const char *buf, size_t count)
924 {
925 struct i2c_client *client = to_i2c_client(dev);
926 struct lm90_data *data = i2c_get_clientdata(client);
927 long val;
928 int err;
929 int temp;
930
931 err = kstrtol(buf, 10, &val);
932 if (err < 0)
933 return err;
934
935 mutex_lock(&data->update_lock);
936 if (data->kind == adt7461 || data->kind == tmp451)
937 temp = temp_from_u8_adt7461(data, data->temp8[LOCAL_CRIT]);
938 else if (data->kind == max6646)
939 temp = temp_from_u8(data->temp8[LOCAL_CRIT]);
940 else
941 temp = temp_from_s8(data->temp8[LOCAL_CRIT]);
942
943 data->temp_hyst = hyst_to_reg(temp - val);
944 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
945 data->temp_hyst);
946 mutex_unlock(&data->update_lock);
947 return count;
948 }
949
950 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
951 char *buf)
952 {
953 struct lm90_data *data = lm90_update_device(dev);
954 return sprintf(buf, "%d\n", data->alarms);
955 }
956
957 static ssize_t show_alarm(struct device *dev, struct device_attribute
958 *devattr, char *buf)
959 {
960 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
961 struct lm90_data *data = lm90_update_device(dev);
962 int bitnr = attr->index;
963
964 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
965 }
966
967 static ssize_t show_update_interval(struct device *dev,
968 struct device_attribute *attr, char *buf)
969 {
970 struct lm90_data *data = dev_get_drvdata(dev);
971
972 return sprintf(buf, "%u\n", data->update_interval);
973 }
974
975 static ssize_t set_update_interval(struct device *dev,
976 struct device_attribute *attr,
977 const char *buf, size_t count)
978 {
979 struct i2c_client *client = to_i2c_client(dev);
980 struct lm90_data *data = i2c_get_clientdata(client);
981 unsigned long val;
982 int err;
983
984 err = kstrtoul(buf, 10, &val);
985 if (err)
986 return err;
987
988 mutex_lock(&data->update_lock);
989 lm90_set_convrate(client, data, clamp_val(val, 0, 100000));
990 mutex_unlock(&data->update_lock);
991
992 return count;
993 }
994
995 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL,
996 0, LOCAL_TEMP);
997 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL,
998 0, REMOTE_TEMP);
999 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
1000 set_temp8, LOCAL_LOW);
1001 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
1002 set_temp11, 0, REMOTE_LOW);
1003 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
1004 set_temp8, LOCAL_HIGH);
1005 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
1006 set_temp11, 1, REMOTE_HIGH);
1007 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
1008 set_temp8, LOCAL_CRIT);
1009 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
1010 set_temp8, REMOTE_CRIT);
1011 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
1012 set_temphyst, LOCAL_CRIT);
1013 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL,
1014 REMOTE_CRIT);
1015 static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
1016 set_temp11, 2, REMOTE_OFFSET);
1017
1018 /* Individual alarm files */
1019 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
1020 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
1021 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
1022 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
1023 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
1024 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
1025 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
1026 /* Raw alarm file for compatibility */
1027 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
1028
1029 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
1030 set_update_interval);
1031
1032 static struct attribute *lm90_attributes[] = {
1033 &sensor_dev_attr_temp1_input.dev_attr.attr,
1034 &sensor_dev_attr_temp2_input.dev_attr.attr,
1035 &sensor_dev_attr_temp1_min.dev_attr.attr,
1036 &sensor_dev_attr_temp2_min.dev_attr.attr,
1037 &sensor_dev_attr_temp1_max.dev_attr.attr,
1038 &sensor_dev_attr_temp2_max.dev_attr.attr,
1039 &sensor_dev_attr_temp1_crit.dev_attr.attr,
1040 &sensor_dev_attr_temp2_crit.dev_attr.attr,
1041 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
1042 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
1043
1044 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
1045 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
1046 &sensor_dev_attr_temp2_fault.dev_attr.attr,
1047 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
1048 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
1049 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
1050 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
1051 &dev_attr_alarms.attr,
1052 &dev_attr_update_interval.attr,
1053 NULL
1054 };
1055
1056 static const struct attribute_group lm90_group = {
1057 .attrs = lm90_attributes,
1058 };
1059
1060 /*
1061 * Additional attributes for devices with emergency sensors
1062 */
1063 static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp8,
1064 set_temp8, LOCAL_EMERG);
1065 static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp8,
1066 set_temp8, REMOTE_EMERG);
1067 static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO, show_temphyst,
1068 NULL, LOCAL_EMERG);
1069 static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO, show_temphyst,
1070 NULL, REMOTE_EMERG);
1071
1072 static struct attribute *lm90_emergency_attributes[] = {
1073 &sensor_dev_attr_temp1_emergency.dev_attr.attr,
1074 &sensor_dev_attr_temp2_emergency.dev_attr.attr,
1075 &sensor_dev_attr_temp1_emergency_hyst.dev_attr.attr,
1076 &sensor_dev_attr_temp2_emergency_hyst.dev_attr.attr,
1077 NULL
1078 };
1079
1080 static const struct attribute_group lm90_emergency_group = {
1081 .attrs = lm90_emergency_attributes,
1082 };
1083
1084 static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 15);
1085 static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 13);
1086
1087 static struct attribute *lm90_emergency_alarm_attributes[] = {
1088 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
1089 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
1090 NULL
1091 };
1092
1093 static const struct attribute_group lm90_emergency_alarm_group = {
1094 .attrs = lm90_emergency_alarm_attributes,
1095 };
1096
1097 /*
1098 * Additional attributes for devices with 3 temperature sensors
1099 */
1100 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL,
1101 0, REMOTE2_TEMP);
1102 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11,
1103 set_temp11, 3, REMOTE2_LOW);
1104 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11,
1105 set_temp11, 4, REMOTE2_HIGH);
1106 static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8,
1107 set_temp8, REMOTE2_CRIT);
1108 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL,
1109 REMOTE2_CRIT);
1110 static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8,
1111 set_temp8, REMOTE2_EMERG);
1112 static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst,
1113 NULL, REMOTE2_EMERG);
1114
1115 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
1116 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10);
1117 static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 11);
1118 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 12);
1119 static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO, show_alarm, NULL, 14);
1120
1121 static struct attribute *lm90_temp3_attributes[] = {
1122 &sensor_dev_attr_temp3_input.dev_attr.attr,
1123 &sensor_dev_attr_temp3_min.dev_attr.attr,
1124 &sensor_dev_attr_temp3_max.dev_attr.attr,
1125 &sensor_dev_attr_temp3_crit.dev_attr.attr,
1126 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
1127 &sensor_dev_attr_temp3_emergency.dev_attr.attr,
1128 &sensor_dev_attr_temp3_emergency_hyst.dev_attr.attr,
1129
1130 &sensor_dev_attr_temp3_fault.dev_attr.attr,
1131 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
1132 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
1133 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
1134 &sensor_dev_attr_temp3_emergency_alarm.dev_attr.attr,
1135 NULL
1136 };
1137
1138 static const struct attribute_group lm90_temp3_group = {
1139 .attrs = lm90_temp3_attributes,
1140 };
1141
1142 /* pec used for ADM1032 only */
1143 static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
1144 char *buf)
1145 {
1146 struct i2c_client *client = to_i2c_client(dev);
1147 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
1148 }
1149
1150 static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
1151 const char *buf, size_t count)
1152 {
1153 struct i2c_client *client = to_i2c_client(dev);
1154 long val;
1155 int err;
1156
1157 err = kstrtol(buf, 10, &val);
1158 if (err < 0)
1159 return err;
1160
1161 switch (val) {
1162 case 0:
1163 client->flags &= ~I2C_CLIENT_PEC;
1164 break;
1165 case 1:
1166 client->flags |= I2C_CLIENT_PEC;
1167 break;
1168 default:
1169 return -EINVAL;
1170 }
1171
1172 return count;
1173 }
1174
1175 static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
1176
1177 /*
1178 * Real code
1179 */
1180
1181 /* Return 0 if detection is successful, -ENODEV otherwise */
1182 static int lm90_detect(struct i2c_client *client,
1183 struct i2c_board_info *info)
1184 {
1185 struct i2c_adapter *adapter = client->adapter;
1186 int address = client->addr;
1187 const char *name = NULL;
1188 int man_id, chip_id, config1, config2, convrate;
1189
1190 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1191 return -ENODEV;
1192
1193 /* detection and identification */
1194 man_id = i2c_smbus_read_byte_data(client, LM90_REG_R_MAN_ID);
1195 chip_id = i2c_smbus_read_byte_data(client, LM90_REG_R_CHIP_ID);
1196 config1 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
1197 convrate = i2c_smbus_read_byte_data(client, LM90_REG_R_CONVRATE);
1198 if (man_id < 0 || chip_id < 0 || config1 < 0 || convrate < 0)
1199 return -ENODEV;
1200
1201 if (man_id == 0x01 || man_id == 0x5C || man_id == 0x41) {
1202 config2 = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG2);
1203 if (config2 < 0)
1204 return -ENODEV;
1205 } else
1206 config2 = 0; /* Make compiler happy */
1207
1208 if ((address == 0x4C || address == 0x4D)
1209 && man_id == 0x01) { /* National Semiconductor */
1210 if ((config1 & 0x2A) == 0x00
1211 && (config2 & 0xF8) == 0x00
1212 && convrate <= 0x09) {
1213 if (address == 0x4C
1214 && (chip_id & 0xF0) == 0x20) { /* LM90 */
1215 name = "lm90";
1216 } else
1217 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
1218 name = "lm99";
1219 dev_info(&adapter->dev,
1220 "Assuming LM99 chip at 0x%02x\n",
1221 address);
1222 dev_info(&adapter->dev,
1223 "If it is an LM89, instantiate it "
1224 "with the new_device sysfs "
1225 "interface\n");
1226 } else
1227 if (address == 0x4C
1228 && (chip_id & 0xF0) == 0x10) { /* LM86 */
1229 name = "lm86";
1230 }
1231 }
1232 } else
1233 if ((address == 0x4C || address == 0x4D)
1234 && man_id == 0x41) { /* Analog Devices */
1235 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
1236 && (config1 & 0x3F) == 0x00
1237 && convrate <= 0x0A) {
1238 name = "adm1032";
1239 /*
1240 * The ADM1032 supports PEC, but only if combined
1241 * transactions are not used.
1242 */
1243 if (i2c_check_functionality(adapter,
1244 I2C_FUNC_SMBUS_BYTE))
1245 info->flags |= I2C_CLIENT_PEC;
1246 } else
1247 if (chip_id == 0x51 /* ADT7461 */
1248 && (config1 & 0x1B) == 0x00
1249 && convrate <= 0x0A) {
1250 name = "adt7461";
1251 } else
1252 if (chip_id == 0x57 /* ADT7461A, NCT1008 */
1253 && (config1 & 0x1B) == 0x00
1254 && convrate <= 0x0A) {
1255 name = "adt7461a";
1256 }
1257 } else
1258 if (man_id == 0x4D) { /* Maxim */
1259 int emerg, emerg2, status2;
1260
1261 /*
1262 * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read
1263 * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG
1264 * exists, both readings will reflect the same value. Otherwise,
1265 * the readings will be different.
1266 */
1267 emerg = i2c_smbus_read_byte_data(client,
1268 MAX6659_REG_R_REMOTE_EMERG);
1269 man_id = i2c_smbus_read_byte_data(client,
1270 LM90_REG_R_MAN_ID);
1271 emerg2 = i2c_smbus_read_byte_data(client,
1272 MAX6659_REG_R_REMOTE_EMERG);
1273 status2 = i2c_smbus_read_byte_data(client,
1274 MAX6696_REG_R_STATUS2);
1275 if (emerg < 0 || man_id < 0 || emerg2 < 0 || status2 < 0)
1276 return -ENODEV;
1277
1278 /*
1279 * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
1280 * register. Reading from that address will return the last
1281 * read value, which in our case is those of the man_id
1282 * register. Likewise, the config1 register seems to lack a
1283 * low nibble, so the value will be those of the previous
1284 * read, so in our case those of the man_id register.
1285 * MAX6659 has a third set of upper temperature limit registers.
1286 * Those registers also return values on MAX6657 and MAX6658,
1287 * thus the only way to detect MAX6659 is by its address.
1288 * For this reason it will be mis-detected as MAX6657 if its
1289 * address is 0x4C.
1290 */
1291 if (chip_id == man_id
1292 && (address == 0x4C || address == 0x4D || address == 0x4E)
1293 && (config1 & 0x1F) == (man_id & 0x0F)
1294 && convrate <= 0x09) {
1295 if (address == 0x4C)
1296 name = "max6657";
1297 else
1298 name = "max6659";
1299 } else
1300 /*
1301 * Even though MAX6695 and MAX6696 do not have a chip ID
1302 * register, reading it returns 0x01. Bit 4 of the config1
1303 * register is unused and should return zero when read. Bit 0 of
1304 * the status2 register is unused and should return zero when
1305 * read.
1306 *
1307 * MAX6695 and MAX6696 have an additional set of temperature
1308 * limit registers. We can detect those chips by checking if
1309 * one of those registers exists.
1310 */
1311 if (chip_id == 0x01
1312 && (config1 & 0x10) == 0x00
1313 && (status2 & 0x01) == 0x00
1314 && emerg == emerg2
1315 && convrate <= 0x07) {
1316 name = "max6696";
1317 } else
1318 /*
1319 * The chip_id register of the MAX6680 and MAX6681 holds the
1320 * revision of the chip. The lowest bit of the config1 register
1321 * is unused and should return zero when read, so should the
1322 * second to last bit of config1 (software reset).
1323 */
1324 if (chip_id == 0x01
1325 && (config1 & 0x03) == 0x00
1326 && convrate <= 0x07) {
1327 name = "max6680";
1328 } else
1329 /*
1330 * The chip_id register of the MAX6646/6647/6649 holds the
1331 * revision of the chip. The lowest 6 bits of the config1
1332 * register are unused and should return zero when read.
1333 */
1334 if (chip_id == 0x59
1335 && (config1 & 0x3f) == 0x00
1336 && convrate <= 0x07) {
1337 name = "max6646";
1338 }
1339 } else
1340 if (address == 0x4C
1341 && man_id == 0x5C) { /* Winbond/Nuvoton */
1342 if ((config1 & 0x2A) == 0x00
1343 && (config2 & 0xF8) == 0x00) {
1344 if (chip_id == 0x01 /* W83L771W/G */
1345 && convrate <= 0x09) {
1346 name = "w83l771";
1347 } else
1348 if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */
1349 && convrate <= 0x08) {
1350 name = "w83l771";
1351 }
1352 }
1353 } else
1354 if (address >= 0x48 && address <= 0x4F
1355 && man_id == 0xA1) { /* NXP Semiconductor/Philips */
1356 if (chip_id == 0x00
1357 && (config1 & 0x2A) == 0x00
1358 && (config2 & 0xFE) == 0x00
1359 && convrate <= 0x09) {
1360 name = "sa56004";
1361 }
1362 } else
1363 if ((address == 0x4C || address == 0x4D)
1364 && man_id == 0x47) { /* GMT */
1365 if (chip_id == 0x01 /* G781 */
1366 && (config1 & 0x3F) == 0x00
1367 && convrate <= 0x08)
1368 name = "g781";
1369 } else
1370 if (address == 0x4C
1371 && man_id == 0x55) { /* Texas Instruments */
1372 int local_ext;
1373
1374 local_ext = i2c_smbus_read_byte_data(client,
1375 TMP451_REG_R_LOCAL_TEMPL);
1376
1377 if (chip_id == 0x00 /* TMP451 */
1378 && (config1 & 0x1B) == 0x00
1379 && convrate <= 0x09
1380 && (local_ext & 0x0F) == 0x00)
1381 name = "tmp451";
1382 }
1383
1384 if (!name) { /* identification failed */
1385 dev_dbg(&adapter->dev,
1386 "Unsupported chip at 0x%02x (man_id=0x%02X, "
1387 "chip_id=0x%02X)\n", address, man_id, chip_id);
1388 return -ENODEV;
1389 }
1390
1391 strlcpy(info->type, name, I2C_NAME_SIZE);
1392
1393 return 0;
1394 }
1395
1396 static void lm90_remove_files(struct i2c_client *client, struct lm90_data *data)
1397 {
1398 struct device *dev = &client->dev;
1399
1400 if (data->flags & LM90_HAVE_TEMP3)
1401 sysfs_remove_group(&dev->kobj, &lm90_temp3_group);
1402 if (data->flags & LM90_HAVE_EMERGENCY_ALARM)
1403 sysfs_remove_group(&dev->kobj, &lm90_emergency_alarm_group);
1404 if (data->flags & LM90_HAVE_EMERGENCY)
1405 sysfs_remove_group(&dev->kobj, &lm90_emergency_group);
1406 if (data->flags & LM90_HAVE_OFFSET)
1407 device_remove_file(dev, &sensor_dev_attr_temp2_offset.dev_attr);
1408 device_remove_file(dev, &dev_attr_pec);
1409 sysfs_remove_group(&dev->kobj, &lm90_group);
1410 }
1411
1412 static void lm90_restore_conf(struct i2c_client *client, struct lm90_data *data)
1413 {
1414 /* Restore initial configuration */
1415 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
1416 data->convrate_orig);
1417 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
1418 data->config_orig);
1419 }
1420
1421 static void lm90_init_client(struct i2c_client *client)
1422 {
1423 u8 config, convrate;
1424 struct lm90_data *data = i2c_get_clientdata(client);
1425
1426 if (lm90_read_reg(client, LM90_REG_R_CONVRATE, &convrate) < 0) {
1427 dev_warn(&client->dev, "Failed to read convrate register!\n");
1428 convrate = LM90_DEF_CONVRATE_RVAL;
1429 }
1430 data->convrate_orig = convrate;
1431
1432 /*
1433 * Start the conversions.
1434 */
1435 lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
1436 if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
1437 dev_warn(&client->dev, "Initialization failed!\n");
1438 return;
1439 }
1440 data->config_orig = config;
1441
1442 /* Check Temperature Range Select */
1443 if (data->kind == adt7461 || data->kind == tmp451) {
1444 if (config & 0x04)
1445 data->flags |= LM90_FLAG_ADT7461_EXT;
1446 }
1447
1448 /*
1449 * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
1450 * 0.125 degree resolution) and range (0x08, extend range
1451 * to -64 degree) mode for the remote temperature sensor.
1452 */
1453 if (data->kind == max6680)
1454 config |= 0x18;
1455
1456 /*
1457 * Select external channel 0 for max6695/96
1458 */
1459 if (data->kind == max6696)
1460 config &= ~0x08;
1461
1462 config &= 0xBF; /* run */
1463 if (config != data->config_orig) /* Only write if changed */
1464 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
1465 }
1466
1467 static bool lm90_is_tripped(struct i2c_client *client, u16 *status)
1468 {
1469 struct lm90_data *data = i2c_get_clientdata(client);
1470 u8 st, st2 = 0;
1471
1472 lm90_read_reg(client, LM90_REG_R_STATUS, &st);
1473
1474 if (data->kind == max6696)
1475 lm90_read_reg(client, MAX6696_REG_R_STATUS2, &st2);
1476
1477 *status = st | (st2 << 8);
1478
1479 if ((st & 0x7f) == 0 && (st2 & 0xfe) == 0)
1480 return false;
1481
1482 if ((st & (LM90_STATUS_LLOW | LM90_STATUS_LHIGH | LM90_STATUS_LTHRM)) ||
1483 (st2 & MAX6696_STATUS2_LOT2))
1484 dev_warn(&client->dev,
1485 "temp%d out of range, please check!\n", 1);
1486 if ((st & (LM90_STATUS_RLOW | LM90_STATUS_RHIGH | LM90_STATUS_RTHRM)) ||
1487 (st2 & MAX6696_STATUS2_ROT2))
1488 dev_warn(&client->dev,
1489 "temp%d out of range, please check!\n", 2);
1490 if (st & LM90_STATUS_ROPEN)
1491 dev_warn(&client->dev,
1492 "temp%d diode open, please check!\n", 2);
1493 if (st2 & (MAX6696_STATUS2_R2LOW | MAX6696_STATUS2_R2HIGH |
1494 MAX6696_STATUS2_R2THRM | MAX6696_STATUS2_R2OT2))
1495 dev_warn(&client->dev,
1496 "temp%d out of range, please check!\n", 3);
1497 if (st2 & MAX6696_STATUS2_R2OPEN)
1498 dev_warn(&client->dev,
1499 "temp%d diode open, please check!\n", 3);
1500
1501 return true;
1502 }
1503
1504 static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
1505 {
1506 struct i2c_client *client = dev_id;
1507 u16 status;
1508
1509 if (lm90_is_tripped(client, &status))
1510 return IRQ_HANDLED;
1511 else
1512 return IRQ_NONE;
1513 }
1514
1515 static int lm90_probe(struct i2c_client *client,
1516 const struct i2c_device_id *id)
1517 {
1518 struct device *dev = &client->dev;
1519 struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);
1520 struct lm90_data *data;
1521 struct regulator *regulator;
1522 int err;
1523
1524 regulator = devm_regulator_get(dev, "vcc");
1525 if (IS_ERR(regulator))
1526 return PTR_ERR(regulator);
1527
1528 err = regulator_enable(regulator);
1529 if (err < 0) {
1530 dev_err(&client->dev,
1531 "Failed to enable regulator: %d\n", err);
1532 return err;
1533 }
1534
1535 data = devm_kzalloc(&client->dev, sizeof(struct lm90_data), GFP_KERNEL);
1536 if (!data)
1537 return -ENOMEM;
1538
1539 i2c_set_clientdata(client, data);
1540 mutex_init(&data->update_lock);
1541
1542 data->regulator = regulator;
1543
1544 /* Set the device type */
1545 data->kind = id->driver_data;
1546 if (data->kind == adm1032) {
1547 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
1548 client->flags &= ~I2C_CLIENT_PEC;
1549 }
1550
1551 /*
1552 * Different devices have different alarm bits triggering the
1553 * ALERT# output
1554 */
1555 data->alert_alarms = lm90_params[data->kind].alert_alarms;
1556
1557 /* Set chip capabilities */
1558 data->flags = lm90_params[data->kind].flags;
1559 data->reg_local_ext = lm90_params[data->kind].reg_local_ext;
1560
1561 /* Set maximum conversion rate */
1562 data->max_convrate = lm90_params[data->kind].max_convrate;
1563
1564 /* Initialize the LM90 chip */
1565 lm90_init_client(client);
1566
1567 /* Register sysfs hooks */
1568 err = sysfs_create_group(&dev->kobj, &lm90_group);
1569 if (err)
1570 goto exit_restore;
1571 if (client->flags & I2C_CLIENT_PEC) {
1572 err = device_create_file(dev, &dev_attr_pec);
1573 if (err)
1574 goto exit_remove_files;
1575 }
1576 if (data->flags & LM90_HAVE_OFFSET) {
1577 err = device_create_file(dev,
1578 &sensor_dev_attr_temp2_offset.dev_attr);
1579 if (err)
1580 goto exit_remove_files;
1581 }
1582 if (data->flags & LM90_HAVE_EMERGENCY) {
1583 err = sysfs_create_group(&dev->kobj, &lm90_emergency_group);
1584 if (err)
1585 goto exit_remove_files;
1586 }
1587 if (data->flags & LM90_HAVE_EMERGENCY_ALARM) {
1588 err = sysfs_create_group(&dev->kobj,
1589 &lm90_emergency_alarm_group);
1590 if (err)
1591 goto exit_remove_files;
1592 }
1593 if (data->flags & LM90_HAVE_TEMP3) {
1594 err = sysfs_create_group(&dev->kobj, &lm90_temp3_group);
1595 if (err)
1596 goto exit_remove_files;
1597 }
1598
1599 data->hwmon_dev = hwmon_device_register(dev);
1600 if (IS_ERR(data->hwmon_dev)) {
1601 err = PTR_ERR(data->hwmon_dev);
1602 goto exit_remove_files;
1603 }
1604
1605 if (client->irq) {
1606 dev_dbg(dev, "IRQ: %d\n", client->irq);
1607 err = devm_request_threaded_irq(dev, client->irq,
1608 NULL, lm90_irq_thread,
1609 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1610 "lm90", client);
1611 if (err < 0) {
1612 dev_err(dev, "cannot request IRQ %d\n", client->irq);
1613 goto exit_unregister;
1614 }
1615 }
1616
1617 return 0;
1618
1619 exit_unregister:
1620 hwmon_device_unregister(data->hwmon_dev);
1621 exit_remove_files:
1622 lm90_remove_files(client, data);
1623 exit_restore:
1624 lm90_restore_conf(client, data);
1625 regulator_disable(data->regulator);
1626
1627 return err;
1628 }
1629
1630 static int lm90_remove(struct i2c_client *client)
1631 {
1632 struct lm90_data *data = i2c_get_clientdata(client);
1633
1634 hwmon_device_unregister(data->hwmon_dev);
1635 lm90_remove_files(client, data);
1636 lm90_restore_conf(client, data);
1637 regulator_disable(data->regulator);
1638
1639 return 0;
1640 }
1641
1642 static void lm90_alert(struct i2c_client *client, unsigned int flag)
1643 {
1644 u16 alarms;
1645
1646 if (lm90_is_tripped(client, &alarms)) {
1647 /*
1648 * Disable ALERT# output, because these chips don't implement
1649 * SMBus alert correctly; they should only hold the alert line
1650 * low briefly.
1651 */
1652 struct lm90_data *data = i2c_get_clientdata(client);
1653
1654 if ((data->flags & LM90_HAVE_BROKEN_ALERT)
1655 && (alarms & data->alert_alarms)) {
1656 u8 config;
1657 dev_dbg(&client->dev, "Disabling ALERT#\n");
1658 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
1659 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
1660 config | 0x80);
1661 }
1662 } else {
1663 dev_info(&client->dev, "Everything OK\n");
1664 }
1665 }
1666
1667 static struct i2c_driver lm90_driver = {
1668 .class = I2C_CLASS_HWMON,
1669 .driver = {
1670 .name = "lm90",
1671 },
1672 .probe = lm90_probe,
1673 .remove = lm90_remove,
1674 .alert = lm90_alert,
1675 .id_table = lm90_id,
1676 .detect = lm90_detect,
1677 .address_list = normal_i2c,
1678 };
1679
1680 module_i2c_driver(lm90_driver);
1681
1682 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
1683 MODULE_DESCRIPTION("LM90/ADM1032 driver");
1684 MODULE_LICENSE("GPL");
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