2 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
4 * Copyright (C) 2003-2006 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. Complete datasheet can be
10 * obtained from National's website at:
11 * http://www.national.com/pf/LM/LM90.html
13 * This driver also supports the LM89 and LM99, two other sensor chips
14 * made by National Semiconductor. Both have an increased remote
15 * temperature measurement accuracy (1 degree), and the LM99
16 * additionally shifts remote temperatures (measured and limits) by 16
17 * degrees, which allows for higher temperatures measurement. The
18 * driver doesn't handle it since it can be done easily in user-space.
19 * Complete datasheets can be obtained from National's website at:
20 * http://www.national.com/pf/LM/LM89.html
21 * http://www.national.com/pf/LM/LM99.html
22 * Note that there is no way to differentiate between both chips.
24 * This driver also supports the LM86, another sensor chip made by
25 * National Semiconductor. It is exactly similar to the LM90 except it
26 * has a higher accuracy.
27 * Complete datasheet can be obtained from National's website at:
28 * http://www.national.com/pf/LM/LM86.html
30 * This driver also supports the ADM1032, a sensor chip made by Analog
31 * Devices. That chip is similar to the LM90, with a few differences
32 * that are not handled by this driver. Complete datasheet can be
33 * obtained from Analog's website at:
34 * http://www.analog.com/en/prod/0,2877,ADM1032,00.html
35 * Among others, it has a higher accuracy than the LM90, much like the
38 * This driver also supports the MAX6657, MAX6658 and MAX6659 sensor
39 * chips made by Maxim. These chips are similar to the LM86. Complete
40 * datasheet can be obtained at Maxim's website at:
41 * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
42 * Note that there is no easy way to differentiate between the three
43 * variants. The extra address and features of the MAX6659 are not
44 * supported by this driver. These chips lack the remote temperature
47 * This driver also supports the MAX6680 and MAX6681, two other sensor
48 * chips made by Maxim. These are quite similar to the other Maxim
49 * chips. Complete datasheet can be obtained at:
50 * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370
51 * The MAX6680 and MAX6681 only differ in the pinout so they can be
52 * treated identically.
54 * This driver also supports the ADT7461 chip from Analog Devices but
55 * only in its "compatability mode". If an ADT7461 chip is found but
56 * is configured in non-compatible mode (where its temperature
57 * register values are decoded differently) it is ignored by this
58 * driver. Complete datasheet can be obtained from Analog's website
60 * http://www.analog.com/en/prod/0,2877,ADT7461,00.html
62 * Since the LM90 was the first chipset supported by this driver, most
63 * comments will refer to this chipset, but are actually general and
64 * concern all supported chipsets, unless mentioned otherwise.
66 * This program is free software; you can redistribute it and/or modify
67 * it under the terms of the GNU General Public License as published by
68 * the Free Software Foundation; either version 2 of the License, or
69 * (at your option) any later version.
71 * This program is distributed in the hope that it will be useful,
72 * but WITHOUT ANY WARRANTY; without even the implied warranty of
73 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
74 * GNU General Public License for more details.
76 * You should have received a copy of the GNU General Public License
77 * along with this program; if not, write to the Free Software
78 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
81 #include <linux/module.h>
82 #include <linux/init.h>
83 #include <linux/slab.h>
84 #include <linux/jiffies.h>
85 #include <linux/i2c.h>
86 #include <linux/hwmon-sysfs.h>
87 #include <linux/hwmon.h>
88 #include <linux/err.h>
89 #include <linux/mutex.h>
90 #include <linux/sysfs.h>
94 * Address is fully defined internally and cannot be changed except for
95 * MAX6659, MAX6680 and MAX6681.
96 * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658
98 * ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d.
99 * MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
100 * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
101 * 0x4c, 0x4d or 0x4e.
104 static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
113 I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);
119 #define LM90_REG_R_MAN_ID 0xFE
120 #define LM90_REG_R_CHIP_ID 0xFF
121 #define LM90_REG_R_CONFIG1 0x03
122 #define LM90_REG_W_CONFIG1 0x09
123 #define LM90_REG_R_CONFIG2 0xBF
124 #define LM90_REG_W_CONFIG2 0xBF
125 #define LM90_REG_R_CONVRATE 0x04
126 #define LM90_REG_W_CONVRATE 0x0A
127 #define LM90_REG_R_STATUS 0x02
128 #define LM90_REG_R_LOCAL_TEMP 0x00
129 #define LM90_REG_R_LOCAL_HIGH 0x05
130 #define LM90_REG_W_LOCAL_HIGH 0x0B
131 #define LM90_REG_R_LOCAL_LOW 0x06
132 #define LM90_REG_W_LOCAL_LOW 0x0C
133 #define LM90_REG_R_LOCAL_CRIT 0x20
134 #define LM90_REG_W_LOCAL_CRIT 0x20
135 #define LM90_REG_R_REMOTE_TEMPH 0x01
136 #define LM90_REG_R_REMOTE_TEMPL 0x10
137 #define LM90_REG_R_REMOTE_OFFSH 0x11
138 #define LM90_REG_W_REMOTE_OFFSH 0x11
139 #define LM90_REG_R_REMOTE_OFFSL 0x12
140 #define LM90_REG_W_REMOTE_OFFSL 0x12
141 #define LM90_REG_R_REMOTE_HIGHH 0x07
142 #define LM90_REG_W_REMOTE_HIGHH 0x0D
143 #define LM90_REG_R_REMOTE_HIGHL 0x13
144 #define LM90_REG_W_REMOTE_HIGHL 0x13
145 #define LM90_REG_R_REMOTE_LOWH 0x08
146 #define LM90_REG_W_REMOTE_LOWH 0x0E
147 #define LM90_REG_R_REMOTE_LOWL 0x14
148 #define LM90_REG_W_REMOTE_LOWL 0x14
149 #define LM90_REG_R_REMOTE_CRIT 0x19
150 #define LM90_REG_W_REMOTE_CRIT 0x19
151 #define LM90_REG_R_TCRIT_HYST 0x21
152 #define LM90_REG_W_TCRIT_HYST 0x21
155 * Conversions and various macros
156 * For local temperatures and limits, critical limits and the hysteresis
157 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
158 * For remote temperatures and limits, it uses signed 11-bit values with
159 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
162 #define TEMP1_FROM_REG(val) ((val) * 1000)
163 #define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \
164 (val) >= 127000 ? 127 : \
165 (val) < 0 ? ((val) - 500) / 1000 : \
166 ((val) + 500) / 1000)
167 #define TEMP2_FROM_REG(val) ((val) / 32 * 125)
168 #define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
169 (val) >= 127875 ? 0x7FE0 : \
170 (val) < 0 ? ((val) - 62) / 125 * 32 : \
171 ((val) + 62) / 125 * 32)
172 #define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
173 ((val) + 500) / 1000)
176 * ADT7461 is almost identical to LM90 except that attempts to write
177 * values that are outside the range 0 < temp < 127 are treated as
178 * the boundary value.
181 #define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
182 (val) >= 127000 ? 127 : \
183 ((val) + 500) / 1000)
184 #define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
185 (val) >= 127750 ? 0x7FC0 : \
186 ((val) + 125) / 250 * 64)
189 * Functions declaration
192 static int lm90_attach_adapter(struct i2c_adapter *adapter);
193 static int lm90_detect(struct i2c_adapter *adapter, int address,
195 static void lm90_init_client(struct i2c_client *client);
196 static int lm90_detach_client(struct i2c_client *client);
197 static struct lm90_data *lm90_update_device(struct device *dev);
200 * Driver data (common to all clients)
203 static struct i2c_driver lm90_driver = {
207 .attach_adapter = lm90_attach_adapter,
208 .detach_client = lm90_detach_client,
212 * Client data (each client gets its own)
216 struct i2c_client client;
217 struct device *hwmon_dev;
218 struct mutex update_lock;
219 char valid; /* zero until following fields are valid */
220 unsigned long last_updated; /* in jiffies */
223 /* registers values */
224 s8 temp8[5]; /* 0: local input
227 3: local critical limit
228 4: remote critical limit */
229 s16 temp11[4]; /* 0: remote input
232 3: remote offset (except max6657) */
234 u8 alarms; /* bitvector */
241 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
244 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
245 struct lm90_data *data = lm90_update_device(dev);
246 return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
249 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
250 const char *buf, size_t count)
252 static const u8 reg[4] = {
253 LM90_REG_W_LOCAL_LOW,
254 LM90_REG_W_LOCAL_HIGH,
255 LM90_REG_W_LOCAL_CRIT,
256 LM90_REG_W_REMOTE_CRIT,
259 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
260 struct i2c_client *client = to_i2c_client(dev);
261 struct lm90_data *data = i2c_get_clientdata(client);
262 long val = simple_strtol(buf, NULL, 10);
263 int nr = attr->index;
265 mutex_lock(&data->update_lock);
266 if (data->kind == adt7461)
267 data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
269 data->temp8[nr] = TEMP1_TO_REG(val);
270 i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
271 mutex_unlock(&data->update_lock);
275 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
278 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
279 struct lm90_data *data = lm90_update_device(dev);
280 return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index]));
283 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
284 const char *buf, size_t count)
286 static const u8 reg[6] = {
287 LM90_REG_W_REMOTE_LOWH,
288 LM90_REG_W_REMOTE_LOWL,
289 LM90_REG_W_REMOTE_HIGHH,
290 LM90_REG_W_REMOTE_HIGHL,
291 LM90_REG_W_REMOTE_OFFSH,
292 LM90_REG_W_REMOTE_OFFSL,
295 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
296 struct i2c_client *client = to_i2c_client(dev);
297 struct lm90_data *data = i2c_get_clientdata(client);
298 long val = simple_strtol(buf, NULL, 10);
299 int nr = attr->index;
301 mutex_lock(&data->update_lock);
302 if (data->kind == adt7461)
303 data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
305 data->temp11[nr] = TEMP2_TO_REG(val);
306 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
307 data->temp11[nr] >> 8);
308 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
309 data->temp11[nr] & 0xff);
310 mutex_unlock(&data->update_lock);
314 static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr,
317 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
318 struct lm90_data *data = lm90_update_device(dev);
319 return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])
320 - TEMP1_FROM_REG(data->temp_hyst));
323 static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
324 const char *buf, size_t count)
326 struct i2c_client *client = to_i2c_client(dev);
327 struct lm90_data *data = i2c_get_clientdata(client);
328 long val = simple_strtol(buf, NULL, 10);
331 mutex_lock(&data->update_lock);
332 hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
333 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
335 mutex_unlock(&data->update_lock);
339 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
342 struct lm90_data *data = lm90_update_device(dev);
343 return sprintf(buf, "%d\n", data->alarms);
346 static ssize_t show_alarm(struct device *dev, struct device_attribute
349 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
350 struct lm90_data *data = lm90_update_device(dev);
351 int bitnr = attr->index;
353 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
356 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
357 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
358 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
360 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
362 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
364 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
366 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
368 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
370 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
372 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
373 static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
376 /* Individual alarm files */
377 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
378 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
379 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
380 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
381 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
382 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
383 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
384 /* Raw alarm file for compatibility */
385 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
387 static struct attribute *lm90_attributes[] = {
388 &sensor_dev_attr_temp1_input.dev_attr.attr,
389 &sensor_dev_attr_temp2_input.dev_attr.attr,
390 &sensor_dev_attr_temp1_min.dev_attr.attr,
391 &sensor_dev_attr_temp2_min.dev_attr.attr,
392 &sensor_dev_attr_temp1_max.dev_attr.attr,
393 &sensor_dev_attr_temp2_max.dev_attr.attr,
394 &sensor_dev_attr_temp1_crit.dev_attr.attr,
395 &sensor_dev_attr_temp2_crit.dev_attr.attr,
396 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
397 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
399 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
400 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
401 &sensor_dev_attr_temp2_fault.dev_attr.attr,
402 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
403 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
404 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
405 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
406 &dev_attr_alarms.attr,
410 static const struct attribute_group lm90_group = {
411 .attrs = lm90_attributes,
414 /* pec used for ADM1032 only */
415 static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
418 struct i2c_client *client = to_i2c_client(dev);
419 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
422 static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
423 const char *buf, size_t count)
425 struct i2c_client *client = to_i2c_client(dev);
426 long val = simple_strtol(buf, NULL, 10);
430 client->flags &= ~I2C_CLIENT_PEC;
433 client->flags |= I2C_CLIENT_PEC;
442 static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
448 /* The ADM1032 supports PEC but not on write byte transactions, so we need
449 to explicitly ask for a transaction without PEC. */
450 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
452 return i2c_smbus_xfer(client->adapter, client->addr,
453 client->flags & ~I2C_CLIENT_PEC,
454 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
457 /* It is assumed that client->update_lock is held (unless we are in
458 detection or initialization steps). This matters when PEC is enabled,
459 because we don't want the address pointer to change between the write
460 byte and the read byte transactions. */
461 static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value)
465 if (client->flags & I2C_CLIENT_PEC) {
466 err = adm1032_write_byte(client, reg);
468 err = i2c_smbus_read_byte(client);
470 err = i2c_smbus_read_byte_data(client, reg);
473 dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
482 static int lm90_attach_adapter(struct i2c_adapter *adapter)
484 if (!(adapter->class & I2C_CLASS_HWMON))
486 return i2c_probe(adapter, &addr_data, lm90_detect);
490 * The following function does more than just detection. If detection
491 * succeeds, it also registers the new chip.
493 static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
495 struct i2c_client *new_client;
496 struct lm90_data *data;
498 const char *name = "";
500 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
503 if (!(data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
508 /* The common I2C client data is placed right before the
509 LM90-specific data. */
510 new_client = &data->client;
511 i2c_set_clientdata(new_client, data);
512 new_client->addr = address;
513 new_client->adapter = adapter;
514 new_client->driver = &lm90_driver;
515 new_client->flags = 0;
518 * Now we do the remaining detection. A negative kind means that
519 * the driver was loaded with no force parameter (default), so we
520 * must both detect and identify the chip. A zero kind means that
521 * the driver was loaded with the force parameter, the detection
522 * step shall be skipped. A positive kind means that the driver
523 * was loaded with the force parameter and a given kind of chip is
524 * requested, so both the detection and the identification steps
528 /* Default to an LM90 if forced */
532 if (kind < 0) { /* detection and identification */
533 int man_id, chip_id, reg_config1, reg_convrate;
535 if ((man_id = i2c_smbus_read_byte_data(new_client,
536 LM90_REG_R_MAN_ID)) < 0
537 || (chip_id = i2c_smbus_read_byte_data(new_client,
538 LM90_REG_R_CHIP_ID)) < 0
539 || (reg_config1 = i2c_smbus_read_byte_data(new_client,
540 LM90_REG_R_CONFIG1)) < 0
541 || (reg_convrate = i2c_smbus_read_byte_data(new_client,
542 LM90_REG_R_CONVRATE)) < 0)
545 if ((address == 0x4C || address == 0x4D)
546 && man_id == 0x01) { /* National Semiconductor */
549 if ((reg_config2 = i2c_smbus_read_byte_data(new_client,
550 LM90_REG_R_CONFIG2)) < 0)
553 if ((reg_config1 & 0x2A) == 0x00
554 && (reg_config2 & 0xF8) == 0x00
555 && reg_convrate <= 0x09) {
557 && (chip_id & 0xF0) == 0x20) { /* LM90 */
560 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
564 && (chip_id & 0xF0) == 0x10) { /* LM86 */
569 if ((address == 0x4C || address == 0x4D)
570 && man_id == 0x41) { /* Analog Devices */
571 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
572 && (reg_config1 & 0x3F) == 0x00
573 && reg_convrate <= 0x0A) {
576 if (chip_id == 0x51 /* ADT7461 */
577 && (reg_config1 & 0x1F) == 0x00 /* check compat mode */
578 && reg_convrate <= 0x0A) {
582 if (man_id == 0x4D) { /* Maxim */
584 * The MAX6657, MAX6658 and MAX6659 do NOT have a
585 * chip_id register. Reading from that address will
586 * return the last read value, which in our case is
587 * those of the man_id register. Likewise, the config1
588 * register seems to lack a low nibble, so the value
589 * will be those of the previous read, so in our case
590 * those of the man_id register.
592 if (chip_id == man_id
593 && (address == 0x4C || address == 0x4D)
594 && (reg_config1 & 0x1F) == (man_id & 0x0F)
595 && reg_convrate <= 0x09) {
598 /* The chip_id register of the MAX6680 and MAX6681
599 * holds the revision of the chip.
600 * the lowest bit of the config1 register is unused
601 * and should return zero when read, so should the
602 * second to last bit of config1 (software reset)
605 && (reg_config1 & 0x03) == 0x00
606 && reg_convrate <= 0x07) {
611 if (kind <= 0) { /* identification failed */
612 dev_info(&adapter->dev,
613 "Unsupported chip (man_id=0x%02X, "
614 "chip_id=0x%02X).\n", man_id, chip_id);
621 } else if (kind == adm1032) {
623 /* The ADM1032 supports PEC, but only if combined
624 transactions are not used. */
625 if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
626 new_client->flags |= I2C_CLIENT_PEC;
627 } else if (kind == lm99) {
629 } else if (kind == lm86) {
631 } else if (kind == max6657) {
633 } else if (kind == max6680) {
635 } else if (kind == adt7461) {
639 /* We can fill in the remaining client fields */
640 strlcpy(new_client->name, name, I2C_NAME_SIZE);
643 mutex_init(&data->update_lock);
645 /* Tell the I2C layer a new client has arrived */
646 if ((err = i2c_attach_client(new_client)))
649 /* Initialize the LM90 chip */
650 lm90_init_client(new_client);
652 /* Register sysfs hooks */
653 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group)))
655 if (new_client->flags & I2C_CLIENT_PEC) {
656 if ((err = device_create_file(&new_client->dev,
658 goto exit_remove_files;
660 if (data->kind != max6657) {
661 if ((err = device_create_file(&new_client->dev,
662 &sensor_dev_attr_temp2_offset.dev_attr)))
663 goto exit_remove_files;
666 data->hwmon_dev = hwmon_device_register(&new_client->dev);
667 if (IS_ERR(data->hwmon_dev)) {
668 err = PTR_ERR(data->hwmon_dev);
669 goto exit_remove_files;
675 sysfs_remove_group(&new_client->dev.kobj, &lm90_group);
676 device_remove_file(&new_client->dev, &dev_attr_pec);
678 i2c_detach_client(new_client);
685 static void lm90_init_client(struct i2c_client *client)
687 u8 config, config_orig;
688 struct lm90_data *data = i2c_get_clientdata(client);
691 * Start the conversions.
693 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
695 if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
696 dev_warn(&client->dev, "Initialization failed!\n");
699 config_orig = config;
702 * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
703 * 0.125 degree resolution) and range (0x08, extend range
704 * to -64 degree) mode for the remote temperature sensor.
706 if (data->kind == max6680) {
710 config &= 0xBF; /* run */
711 if (config != config_orig) /* Only write if changed */
712 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
715 static int lm90_detach_client(struct i2c_client *client)
717 struct lm90_data *data = i2c_get_clientdata(client);
720 hwmon_device_unregister(data->hwmon_dev);
721 sysfs_remove_group(&client->dev.kobj, &lm90_group);
722 device_remove_file(&client->dev, &dev_attr_pec);
723 if (data->kind != max6657)
724 device_remove_file(&client->dev,
725 &sensor_dev_attr_temp2_offset.dev_attr);
727 if ((err = i2c_detach_client(client)))
734 static struct lm90_data *lm90_update_device(struct device *dev)
736 struct i2c_client *client = to_i2c_client(dev);
737 struct lm90_data *data = i2c_get_clientdata(client);
739 mutex_lock(&data->update_lock);
741 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
744 dev_dbg(&client->dev, "Updating lm90 data.\n");
745 lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]);
746 lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]);
747 lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]);
748 lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]);
749 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]);
750 lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
753 * There is a trick here. We have to read two registers to
754 * have the remote sensor temperature, but we have to beware
755 * a conversion could occur inbetween the readings. The
756 * datasheet says we should either use the one-shot
757 * conversion register, which we don't want to do (disables
758 * hardware monitoring) or monitor the busy bit, which is
759 * impossible (we can't read the values and monitor that bit
760 * at the exact same time). So the solution used here is to
761 * read the high byte once, then the low byte, then the high
762 * byte again. If the new high byte matches the old one,
763 * then we have a valid reading. Else we have to read the low
764 * byte again, and now we believe we have a correct reading.
766 if (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0
767 && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0
768 && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0
770 || lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0))
771 data->temp11[0] = (newh << 8) | l;
773 if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0
774 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0)
775 data->temp11[1] = (newh << 8) | l;
776 if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
777 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
778 data->temp11[2] = (newh << 8) | l;
779 if (data->kind != max6657) {
780 if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
782 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
784 data->temp11[3] = (newh << 8) | l;
786 lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
788 data->last_updated = jiffies;
792 mutex_unlock(&data->update_lock);
797 static int __init sensors_lm90_init(void)
799 return i2c_add_driver(&lm90_driver);
802 static void __exit sensors_lm90_exit(void)
804 i2c_del_driver(&lm90_driver);
807 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
808 MODULE_DESCRIPTION("LM90/ADM1032 driver");
809 MODULE_LICENSE("GPL");
811 module_init(sensors_lm90_init);
812 module_exit(sensors_lm90_exit);