2 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
4 * Copyright (C) 2003-2008 Jean Delvare <khali@linux-fr.org>
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.
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. The
16 * driver doesn't handle it since it can be done easily in user-space.
17 * Note that there is no way to differentiate between both chips.
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.
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.
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
35 * This driver also supports the MAX6646, MAX6647 and MAX6649 chips
36 * made by Maxim. These are again similar to the LM86, but they use
37 * unsigned temperature values and can report temperatures from 0 to
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.
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.
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.
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.
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.
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.
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>
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,
93 static const unsigned short normal_i2c[] = {
94 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
100 I2C_CLIENT_INSMOD_8(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680,
107 #define LM90_REG_R_MAN_ID 0xFE
108 #define LM90_REG_R_CHIP_ID 0xFF
109 #define LM90_REG_R_CONFIG1 0x03
110 #define LM90_REG_W_CONFIG1 0x09
111 #define LM90_REG_R_CONFIG2 0xBF
112 #define LM90_REG_W_CONFIG2 0xBF
113 #define LM90_REG_R_CONVRATE 0x04
114 #define LM90_REG_W_CONVRATE 0x0A
115 #define LM90_REG_R_STATUS 0x02
116 #define LM90_REG_R_LOCAL_TEMP 0x00
117 #define LM90_REG_R_LOCAL_HIGH 0x05
118 #define LM90_REG_W_LOCAL_HIGH 0x0B
119 #define LM90_REG_R_LOCAL_LOW 0x06
120 #define LM90_REG_W_LOCAL_LOW 0x0C
121 #define LM90_REG_R_LOCAL_CRIT 0x20
122 #define LM90_REG_W_LOCAL_CRIT 0x20
123 #define LM90_REG_R_REMOTE_TEMPH 0x01
124 #define LM90_REG_R_REMOTE_TEMPL 0x10
125 #define LM90_REG_R_REMOTE_OFFSH 0x11
126 #define LM90_REG_W_REMOTE_OFFSH 0x11
127 #define LM90_REG_R_REMOTE_OFFSL 0x12
128 #define LM90_REG_W_REMOTE_OFFSL 0x12
129 #define LM90_REG_R_REMOTE_HIGHH 0x07
130 #define LM90_REG_W_REMOTE_HIGHH 0x0D
131 #define LM90_REG_R_REMOTE_HIGHL 0x13
132 #define LM90_REG_W_REMOTE_HIGHL 0x13
133 #define LM90_REG_R_REMOTE_LOWH 0x08
134 #define LM90_REG_W_REMOTE_LOWH 0x0E
135 #define LM90_REG_R_REMOTE_LOWL 0x14
136 #define LM90_REG_W_REMOTE_LOWL 0x14
137 #define LM90_REG_R_REMOTE_CRIT 0x19
138 #define LM90_REG_W_REMOTE_CRIT 0x19
139 #define LM90_REG_R_TCRIT_HYST 0x21
140 #define LM90_REG_W_TCRIT_HYST 0x21
142 /* MAX6646/6647/6649/6657/6658/6659 registers */
144 #define MAX6657_REG_R_LOCAL_TEMPL 0x11
149 #define LM90_FLAG_ADT7461_EXT 0x01 /* ADT7461 extended mode */
152 * Functions declaration
155 static int lm90_detect(struct i2c_client *client, int kind,
156 struct i2c_board_info *info);
157 static int lm90_probe(struct i2c_client *client,
158 const struct i2c_device_id *id);
159 static void lm90_init_client(struct i2c_client *client);
160 static int lm90_remove(struct i2c_client *client);
161 static struct lm90_data *lm90_update_device(struct device *dev);
164 * Driver data (common to all clients)
167 static const struct i2c_device_id lm90_id[] = {
168 { "adm1032", adm1032 },
169 { "adt7461", adt7461 },
173 { "lm99", lm99 }, /* Missing temperature offset */
174 { "max6646", max6646 },
175 { "max6647", max6646 },
176 { "max6649", max6646 },
177 { "max6657", max6657 },
178 { "max6658", max6657 },
179 { "max6659", max6657 },
180 { "max6680", max6680 },
181 { "max6681", max6680 },
184 MODULE_DEVICE_TABLE(i2c, lm90_id);
186 static struct i2c_driver lm90_driver = {
187 .class = I2C_CLASS_HWMON,
192 .remove = lm90_remove,
194 .detect = lm90_detect,
195 .address_data = &addr_data,
199 * Client data (each client gets its own)
203 struct device *hwmon_dev;
204 struct mutex update_lock;
205 char valid; /* zero until following fields are valid */
206 unsigned long last_updated; /* in jiffies */
210 /* registers values */
211 s8 temp8[4]; /* 0: local low limit
213 2: local critical limit
214 3: remote critical limit */
215 s16 temp11[5]; /* 0: remote input
218 3: remote offset (except max6646 and max6657)
221 u8 alarms; /* bitvector */
226 * For local temperatures and limits, critical limits and the hysteresis
227 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
228 * For remote temperatures and limits, it uses signed 11-bit values with
229 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some
230 * Maxim chips use unsigned values.
233 static inline int temp_from_s8(s8 val)
238 static inline int temp_from_u8(u8 val)
243 static inline int temp_from_s16(s16 val)
245 return val / 32 * 125;
248 static inline int temp_from_u16(u16 val)
250 return val / 32 * 125;
253 static s8 temp_to_s8(long val)
260 return (val - 500) / 1000;
261 return (val + 500) / 1000;
264 static u8 temp_to_u8(long val)
270 return (val + 500) / 1000;
273 static s16 temp_to_s16(long val)
280 return (val - 62) / 125 * 32;
281 return (val + 62) / 125 * 32;
284 static u8 hyst_to_reg(long val)
290 return (val + 500) / 1000;
294 * ADT7461 in compatibility mode is almost identical to LM90 except that
295 * attempts to write values that are outside the range 0 < temp < 127 are
296 * treated as the boundary value.
298 * ADT7461 in "extended mode" operation uses unsigned integers offset by
299 * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC.
301 static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
303 if (data->flags & LM90_FLAG_ADT7461_EXT)
304 return (val - 64) * 1000;
306 return temp_from_s8(val);
309 static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
311 if (data->flags & LM90_FLAG_ADT7461_EXT)
312 return (val - 0x4000) / 64 * 250;
314 return temp_from_s16(val);
317 static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
319 if (data->flags & LM90_FLAG_ADT7461_EXT) {
324 return (val + 500 + 64000) / 1000;
330 return (val + 500) / 1000;
334 static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
336 if (data->flags & LM90_FLAG_ADT7461_EXT) {
341 return (val + 64000 + 125) / 250 * 64;
347 return (val + 125) / 250 * 64;
355 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
358 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
359 struct lm90_data *data = lm90_update_device(dev);
362 if (data->kind == adt7461)
363 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
364 else if (data->kind == max6646)
365 temp = temp_from_u8(data->temp8[attr->index]);
367 temp = temp_from_s8(data->temp8[attr->index]);
369 return sprintf(buf, "%d\n", temp);
372 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
373 const char *buf, size_t count)
375 static const u8 reg[4] = {
376 LM90_REG_W_LOCAL_LOW,
377 LM90_REG_W_LOCAL_HIGH,
378 LM90_REG_W_LOCAL_CRIT,
379 LM90_REG_W_REMOTE_CRIT,
382 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
383 struct i2c_client *client = to_i2c_client(dev);
384 struct lm90_data *data = i2c_get_clientdata(client);
385 long val = simple_strtol(buf, NULL, 10);
386 int nr = attr->index;
388 mutex_lock(&data->update_lock);
389 if (data->kind == adt7461)
390 data->temp8[nr] = temp_to_u8_adt7461(data, val);
391 else if (data->kind == max6646)
392 data->temp8[nr] = temp_to_u8(val);
394 data->temp8[nr] = temp_to_s8(val);
395 i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
396 mutex_unlock(&data->update_lock);
400 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
403 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
404 struct lm90_data *data = lm90_update_device(dev);
407 if (data->kind == adt7461)
408 temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
409 else if (data->kind == max6646)
410 temp = temp_from_u16(data->temp11[attr->index]);
412 temp = temp_from_s16(data->temp11[attr->index]);
414 return sprintf(buf, "%d\n", temp);
417 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
418 const char *buf, size_t count)
420 static const u8 reg[6] = {
421 LM90_REG_W_REMOTE_LOWH,
422 LM90_REG_W_REMOTE_LOWL,
423 LM90_REG_W_REMOTE_HIGHH,
424 LM90_REG_W_REMOTE_HIGHL,
425 LM90_REG_W_REMOTE_OFFSH,
426 LM90_REG_W_REMOTE_OFFSL,
429 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
430 struct i2c_client *client = to_i2c_client(dev);
431 struct lm90_data *data = i2c_get_clientdata(client);
432 long val = simple_strtol(buf, NULL, 10);
433 int nr = attr->index;
435 mutex_lock(&data->update_lock);
436 if (data->kind == adt7461)
437 data->temp11[nr] = temp_to_u16_adt7461(data, val);
438 else if (data->kind == max6657 || data->kind == max6680)
439 data->temp11[nr] = temp_to_s8(val) << 8;
440 else if (data->kind == max6646)
441 data->temp11[nr] = temp_to_u8(val) << 8;
443 data->temp11[nr] = temp_to_s16(val);
445 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
446 data->temp11[nr] >> 8);
447 if (data->kind != max6657 && data->kind != max6680
448 && data->kind != max6646)
449 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
450 data->temp11[nr] & 0xff);
451 mutex_unlock(&data->update_lock);
455 static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr,
458 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
459 struct lm90_data *data = lm90_update_device(dev);
462 if (data->kind == adt7461)
463 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
464 else if (data->kind == max6646)
465 temp = temp_from_u8(data->temp8[attr->index]);
467 temp = temp_from_s8(data->temp8[attr->index]);
469 return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst));
472 static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
473 const char *buf, size_t count)
475 struct i2c_client *client = to_i2c_client(dev);
476 struct lm90_data *data = i2c_get_clientdata(client);
477 long val = simple_strtol(buf, NULL, 10);
480 mutex_lock(&data->update_lock);
481 if (data->kind == adt7461)
482 temp = temp_from_u8_adt7461(data, data->temp8[2]);
483 else if (data->kind == max6646)
484 temp = temp_from_u8(data->temp8[2]);
486 temp = temp_from_s8(data->temp8[2]);
488 data->temp_hyst = hyst_to_reg(temp - val);
489 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
491 mutex_unlock(&data->update_lock);
495 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
498 struct lm90_data *data = lm90_update_device(dev);
499 return sprintf(buf, "%d\n", data->alarms);
502 static ssize_t show_alarm(struct device *dev, struct device_attribute
505 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
506 struct lm90_data *data = lm90_update_device(dev);
507 int bitnr = attr->index;
509 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
512 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp11, NULL, 4);
513 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
514 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
516 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
518 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
520 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
522 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
524 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
526 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
528 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3);
529 static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
532 /* Individual alarm files */
533 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
534 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
535 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
536 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
537 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
538 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
539 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
540 /* Raw alarm file for compatibility */
541 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
543 static struct attribute *lm90_attributes[] = {
544 &sensor_dev_attr_temp1_input.dev_attr.attr,
545 &sensor_dev_attr_temp2_input.dev_attr.attr,
546 &sensor_dev_attr_temp1_min.dev_attr.attr,
547 &sensor_dev_attr_temp2_min.dev_attr.attr,
548 &sensor_dev_attr_temp1_max.dev_attr.attr,
549 &sensor_dev_attr_temp2_max.dev_attr.attr,
550 &sensor_dev_attr_temp1_crit.dev_attr.attr,
551 &sensor_dev_attr_temp2_crit.dev_attr.attr,
552 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
553 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
555 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
556 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
557 &sensor_dev_attr_temp2_fault.dev_attr.attr,
558 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
559 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
560 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
561 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
562 &dev_attr_alarms.attr,
566 static const struct attribute_group lm90_group = {
567 .attrs = lm90_attributes,
570 /* pec used for ADM1032 only */
571 static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
574 struct i2c_client *client = to_i2c_client(dev);
575 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
578 static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
579 const char *buf, size_t count)
581 struct i2c_client *client = to_i2c_client(dev);
582 long val = simple_strtol(buf, NULL, 10);
586 client->flags &= ~I2C_CLIENT_PEC;
589 client->flags |= I2C_CLIENT_PEC;
598 static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
604 /* The ADM1032 supports PEC but not on write byte transactions, so we need
605 to explicitly ask for a transaction without PEC. */
606 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
608 return i2c_smbus_xfer(client->adapter, client->addr,
609 client->flags & ~I2C_CLIENT_PEC,
610 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
613 /* It is assumed that client->update_lock is held (unless we are in
614 detection or initialization steps). This matters when PEC is enabled,
615 because we don't want the address pointer to change between the write
616 byte and the read byte transactions. */
617 static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value)
621 if (client->flags & I2C_CLIENT_PEC) {
622 err = adm1032_write_byte(client, reg);
624 err = i2c_smbus_read_byte(client);
626 err = i2c_smbus_read_byte_data(client, reg);
629 dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
638 /* Return 0 if detection is successful, -ENODEV otherwise */
639 static int lm90_detect(struct i2c_client *new_client, int kind,
640 struct i2c_board_info *info)
642 struct i2c_adapter *adapter = new_client->adapter;
643 int address = new_client->addr;
644 const char *name = "";
646 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
650 * Now we do the remaining detection. A negative kind means that
651 * the driver was loaded with no force parameter (default), so we
652 * must both detect and identify the chip. A zero kind means that
653 * the driver was loaded with the force parameter, the detection
654 * step shall be skipped. A positive kind means that the driver
655 * was loaded with the force parameter and a given kind of chip is
656 * requested, so both the detection and the identification steps
660 /* Default to an LM90 if forced */
664 if (kind < 0) { /* detection and identification */
665 int man_id, chip_id, reg_config1, reg_convrate;
667 if ((man_id = i2c_smbus_read_byte_data(new_client,
668 LM90_REG_R_MAN_ID)) < 0
669 || (chip_id = i2c_smbus_read_byte_data(new_client,
670 LM90_REG_R_CHIP_ID)) < 0
671 || (reg_config1 = i2c_smbus_read_byte_data(new_client,
672 LM90_REG_R_CONFIG1)) < 0
673 || (reg_convrate = i2c_smbus_read_byte_data(new_client,
674 LM90_REG_R_CONVRATE)) < 0)
677 if ((address == 0x4C || address == 0x4D)
678 && man_id == 0x01) { /* National Semiconductor */
681 if ((reg_config2 = i2c_smbus_read_byte_data(new_client,
682 LM90_REG_R_CONFIG2)) < 0)
685 if ((reg_config1 & 0x2A) == 0x00
686 && (reg_config2 & 0xF8) == 0x00
687 && reg_convrate <= 0x09) {
689 && (chip_id & 0xF0) == 0x20) { /* LM90 */
692 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
696 && (chip_id & 0xF0) == 0x10) { /* LM86 */
701 if ((address == 0x4C || address == 0x4D)
702 && man_id == 0x41) { /* Analog Devices */
703 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
704 && (reg_config1 & 0x3F) == 0x00
705 && reg_convrate <= 0x0A) {
708 if (chip_id == 0x51 /* ADT7461 */
709 && (reg_config1 & 0x1B) == 0x00
710 && reg_convrate <= 0x0A) {
714 if (man_id == 0x4D) { /* Maxim */
716 * The MAX6657, MAX6658 and MAX6659 do NOT have a
717 * chip_id register. Reading from that address will
718 * return the last read value, which in our case is
719 * those of the man_id register. Likewise, the config1
720 * register seems to lack a low nibble, so the value
721 * will be those of the previous read, so in our case
722 * those of the man_id register.
724 if (chip_id == man_id
725 && (address == 0x4C || address == 0x4D)
726 && (reg_config1 & 0x1F) == (man_id & 0x0F)
727 && reg_convrate <= 0x09) {
730 /* The chip_id register of the MAX6680 and MAX6681
731 * holds the revision of the chip.
732 * the lowest bit of the config1 register is unused
733 * and should return zero when read, so should the
734 * second to last bit of config1 (software reset)
737 && (reg_config1 & 0x03) == 0x00
738 && reg_convrate <= 0x07) {
741 /* The chip_id register of the MAX6646/6647/6649
742 * holds the revision of the chip.
743 * The lowest 6 bits of the config1 register are
744 * unused and should return zero when read.
747 && (reg_config1 & 0x3f) == 0x00
748 && reg_convrate <= 0x07) {
753 if (kind <= 0) { /* identification failed */
754 dev_dbg(&adapter->dev,
755 "Unsupported chip at 0x%02x (man_id=0x%02X, "
756 "chip_id=0x%02X)\n", address, man_id, chip_id);
761 /* Fill the i2c board info */
764 } else if (kind == adm1032) {
766 /* The ADM1032 supports PEC, but only if combined
767 transactions are not used. */
768 if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
769 info->flags |= I2C_CLIENT_PEC;
770 } else if (kind == lm99) {
772 } else if (kind == lm86) {
774 } else if (kind == max6657) {
776 } else if (kind == max6680) {
778 } else if (kind == adt7461) {
780 } else if (kind == max6646) {
783 strlcpy(info->type, name, I2C_NAME_SIZE);
788 static int lm90_probe(struct i2c_client *new_client,
789 const struct i2c_device_id *id)
791 struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent);
792 struct lm90_data *data;
795 data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL);
800 i2c_set_clientdata(new_client, data);
801 mutex_init(&data->update_lock);
803 /* Set the device type */
804 data->kind = id->driver_data;
805 if (data->kind == adm1032) {
806 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
807 new_client->flags &= ~I2C_CLIENT_PEC;
810 /* Initialize the LM90 chip */
811 lm90_init_client(new_client);
813 /* Register sysfs hooks */
814 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group)))
816 if (new_client->flags & I2C_CLIENT_PEC) {
817 if ((err = device_create_file(&new_client->dev,
819 goto exit_remove_files;
821 if (data->kind != max6657 && data->kind != max6646) {
822 if ((err = device_create_file(&new_client->dev,
823 &sensor_dev_attr_temp2_offset.dev_attr)))
824 goto exit_remove_files;
827 data->hwmon_dev = hwmon_device_register(&new_client->dev);
828 if (IS_ERR(data->hwmon_dev)) {
829 err = PTR_ERR(data->hwmon_dev);
830 goto exit_remove_files;
836 sysfs_remove_group(&new_client->dev.kobj, &lm90_group);
837 device_remove_file(&new_client->dev, &dev_attr_pec);
844 static void lm90_init_client(struct i2c_client *client)
846 u8 config, config_orig;
847 struct lm90_data *data = i2c_get_clientdata(client);
850 * Start the conversions.
852 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
854 if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
855 dev_warn(&client->dev, "Initialization failed!\n");
858 config_orig = config;
860 /* Check Temperature Range Select */
861 if (data->kind == adt7461) {
863 data->flags |= LM90_FLAG_ADT7461_EXT;
867 * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
868 * 0.125 degree resolution) and range (0x08, extend range
869 * to -64 degree) mode for the remote temperature sensor.
871 if (data->kind == max6680) {
875 config &= 0xBF; /* run */
876 if (config != config_orig) /* Only write if changed */
877 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
880 static int lm90_remove(struct i2c_client *client)
882 struct lm90_data *data = i2c_get_clientdata(client);
884 hwmon_device_unregister(data->hwmon_dev);
885 sysfs_remove_group(&client->dev.kobj, &lm90_group);
886 device_remove_file(&client->dev, &dev_attr_pec);
887 if (data->kind != max6657 && data->kind != max6646)
888 device_remove_file(&client->dev,
889 &sensor_dev_attr_temp2_offset.dev_attr);
895 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
901 * There is a trick here. We have to read two registers to have the
902 * sensor temperature, but we have to beware a conversion could occur
903 * inbetween the readings. The datasheet says we should either use
904 * the one-shot conversion register, which we don't want to do
905 * (disables hardware monitoring) or monitor the busy bit, which is
906 * impossible (we can't read the values and monitor that bit at the
907 * exact same time). So the solution used here is to read the high
908 * byte once, then the low byte, then the high byte again. If the new
909 * high byte matches the old one, then we have a valid reading. Else
910 * we have to read the low byte again, and now we believe we have a
913 if ((err = lm90_read_reg(client, regh, &oldh))
914 || (err = lm90_read_reg(client, regl, &l))
915 || (err = lm90_read_reg(client, regh, &newh)))
918 err = lm90_read_reg(client, regl, &l);
922 *value = (newh << 8) | l;
927 static struct lm90_data *lm90_update_device(struct device *dev)
929 struct i2c_client *client = to_i2c_client(dev);
930 struct lm90_data *data = i2c_get_clientdata(client);
932 mutex_lock(&data->update_lock);
934 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
937 dev_dbg(&client->dev, "Updating lm90 data.\n");
938 lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
939 lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
940 lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
941 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
942 lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
944 if (data->kind == max6657 || data->kind == max6646) {
945 lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
946 MAX6657_REG_R_LOCAL_TEMPL,
949 if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
951 data->temp11[4] = h << 8;
953 lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
954 LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);
956 if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
957 data->temp11[1] = h << 8;
958 if (data->kind != max6657 && data->kind != max6680
959 && data->kind != max6646
960 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
962 data->temp11[1] |= l;
964 if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
965 data->temp11[2] = h << 8;
966 if (data->kind != max6657 && data->kind != max6680
967 && data->kind != max6646
968 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
970 data->temp11[2] |= l;
973 if (data->kind != max6657 && data->kind != max6646) {
974 if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
976 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
978 data->temp11[3] = (h << 8) | l;
980 lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
982 data->last_updated = jiffies;
986 mutex_unlock(&data->update_lock);
991 static int __init sensors_lm90_init(void)
993 return i2c_add_driver(&lm90_driver);
996 static void __exit sensors_lm90_exit(void)
998 i2c_del_driver(&lm90_driver);
1001 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
1002 MODULE_DESCRIPTION("LM90/ADM1032 driver");
1003 MODULE_LICENSE("GPL");
1005 module_init(sensors_lm90_init);
1006 module_exit(sensors_lm90_exit);