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 const unsigned short normal_i2c[] = {
105 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
111 I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);
117 #define LM90_REG_R_MAN_ID 0xFE
118 #define LM90_REG_R_CHIP_ID 0xFF
119 #define LM90_REG_R_CONFIG1 0x03
120 #define LM90_REG_W_CONFIG1 0x09
121 #define LM90_REG_R_CONFIG2 0xBF
122 #define LM90_REG_W_CONFIG2 0xBF
123 #define LM90_REG_R_CONVRATE 0x04
124 #define LM90_REG_W_CONVRATE 0x0A
125 #define LM90_REG_R_STATUS 0x02
126 #define LM90_REG_R_LOCAL_TEMP 0x00
127 #define LM90_REG_R_LOCAL_HIGH 0x05
128 #define LM90_REG_W_LOCAL_HIGH 0x0B
129 #define LM90_REG_R_LOCAL_LOW 0x06
130 #define LM90_REG_W_LOCAL_LOW 0x0C
131 #define LM90_REG_R_LOCAL_CRIT 0x20
132 #define LM90_REG_W_LOCAL_CRIT 0x20
133 #define LM90_REG_R_REMOTE_TEMPH 0x01
134 #define LM90_REG_R_REMOTE_TEMPL 0x10
135 #define LM90_REG_R_REMOTE_OFFSH 0x11
136 #define LM90_REG_W_REMOTE_OFFSH 0x11
137 #define LM90_REG_R_REMOTE_OFFSL 0x12
138 #define LM90_REG_W_REMOTE_OFFSL 0x12
139 #define LM90_REG_R_REMOTE_HIGHH 0x07
140 #define LM90_REG_W_REMOTE_HIGHH 0x0D
141 #define LM90_REG_R_REMOTE_HIGHL 0x13
142 #define LM90_REG_W_REMOTE_HIGHL 0x13
143 #define LM90_REG_R_REMOTE_LOWH 0x08
144 #define LM90_REG_W_REMOTE_LOWH 0x0E
145 #define LM90_REG_R_REMOTE_LOWL 0x14
146 #define LM90_REG_W_REMOTE_LOWL 0x14
147 #define LM90_REG_R_REMOTE_CRIT 0x19
148 #define LM90_REG_W_REMOTE_CRIT 0x19
149 #define LM90_REG_R_TCRIT_HYST 0x21
150 #define LM90_REG_W_TCRIT_HYST 0x21
153 * Conversions and various macros
154 * For local temperatures and limits, critical limits and the hysteresis
155 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
156 * For remote temperatures and limits, it uses signed 11-bit values with
157 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
160 #define TEMP1_FROM_REG(val) ((val) * 1000)
161 #define TEMP1_TO_REG(val) ((val) <= -128000 ? -128 : \
162 (val) >= 127000 ? 127 : \
163 (val) < 0 ? ((val) - 500) / 1000 : \
164 ((val) + 500) / 1000)
165 #define TEMP2_FROM_REG(val) ((val) / 32 * 125)
166 #define TEMP2_TO_REG(val) ((val) <= -128000 ? 0x8000 : \
167 (val) >= 127875 ? 0x7FE0 : \
168 (val) < 0 ? ((val) - 62) / 125 * 32 : \
169 ((val) + 62) / 125 * 32)
170 #define HYST_TO_REG(val) ((val) <= 0 ? 0 : (val) >= 30500 ? 31 : \
171 ((val) + 500) / 1000)
174 * ADT7461 is almost identical to LM90 except that attempts to write
175 * values that are outside the range 0 < temp < 127 are treated as
176 * the boundary value.
179 #define TEMP1_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
180 (val) >= 127000 ? 127 : \
181 ((val) + 500) / 1000)
182 #define TEMP2_TO_REG_ADT7461(val) ((val) <= 0 ? 0 : \
183 (val) >= 127750 ? 0x7FC0 : \
184 ((val) + 125) / 250 * 64)
187 * Functions declaration
190 static int lm90_attach_adapter(struct i2c_adapter *adapter);
191 static int lm90_detect(struct i2c_adapter *adapter, int address,
193 static void lm90_init_client(struct i2c_client *client);
194 static int lm90_detach_client(struct i2c_client *client);
195 static struct lm90_data *lm90_update_device(struct device *dev);
198 * Driver data (common to all clients)
201 static struct i2c_driver lm90_driver = {
205 .attach_adapter = lm90_attach_adapter,
206 .detach_client = lm90_detach_client,
210 * Client data (each client gets its own)
214 struct i2c_client client;
215 struct device *hwmon_dev;
216 struct mutex update_lock;
217 char valid; /* zero until following fields are valid */
218 unsigned long last_updated; /* in jiffies */
221 /* registers values */
222 s8 temp8[5]; /* 0: local input
225 3: local critical limit
226 4: remote critical limit */
227 s16 temp11[4]; /* 0: remote input
230 3: remote offset (except max6657) */
232 u8 alarms; /* bitvector */
239 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
242 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
243 struct lm90_data *data = lm90_update_device(dev);
244 return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
247 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
248 const char *buf, size_t count)
250 static const u8 reg[4] = {
251 LM90_REG_W_LOCAL_LOW,
252 LM90_REG_W_LOCAL_HIGH,
253 LM90_REG_W_LOCAL_CRIT,
254 LM90_REG_W_REMOTE_CRIT,
257 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
258 struct i2c_client *client = to_i2c_client(dev);
259 struct lm90_data *data = i2c_get_clientdata(client);
260 long val = simple_strtol(buf, NULL, 10);
261 int nr = attr->index;
263 mutex_lock(&data->update_lock);
264 if (data->kind == adt7461)
265 data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
267 data->temp8[nr] = TEMP1_TO_REG(val);
268 i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
269 mutex_unlock(&data->update_lock);
273 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
276 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
277 struct lm90_data *data = lm90_update_device(dev);
278 return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index]));
281 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
282 const char *buf, size_t count)
284 static const u8 reg[6] = {
285 LM90_REG_W_REMOTE_LOWH,
286 LM90_REG_W_REMOTE_LOWL,
287 LM90_REG_W_REMOTE_HIGHH,
288 LM90_REG_W_REMOTE_HIGHL,
289 LM90_REG_W_REMOTE_OFFSH,
290 LM90_REG_W_REMOTE_OFFSL,
293 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
294 struct i2c_client *client = to_i2c_client(dev);
295 struct lm90_data *data = i2c_get_clientdata(client);
296 long val = simple_strtol(buf, NULL, 10);
297 int nr = attr->index;
299 mutex_lock(&data->update_lock);
300 if (data->kind == adt7461)
301 data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
303 data->temp11[nr] = TEMP2_TO_REG(val);
304 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
305 data->temp11[nr] >> 8);
306 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
307 data->temp11[nr] & 0xff);
308 mutex_unlock(&data->update_lock);
312 static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr,
315 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
316 struct lm90_data *data = lm90_update_device(dev);
317 return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])
318 - TEMP1_FROM_REG(data->temp_hyst));
321 static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
322 const char *buf, size_t count)
324 struct i2c_client *client = to_i2c_client(dev);
325 struct lm90_data *data = i2c_get_clientdata(client);
326 long val = simple_strtol(buf, NULL, 10);
329 mutex_lock(&data->update_lock);
330 hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
331 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
333 mutex_unlock(&data->update_lock);
337 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
340 struct lm90_data *data = lm90_update_device(dev);
341 return sprintf(buf, "%d\n", data->alarms);
344 static ssize_t show_alarm(struct device *dev, struct device_attribute
347 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
348 struct lm90_data *data = lm90_update_device(dev);
349 int bitnr = attr->index;
351 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
354 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
355 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
356 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
358 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
360 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
362 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
364 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
366 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
368 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
370 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
371 static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
374 /* Individual alarm files */
375 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
376 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
377 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
378 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
379 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
380 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
381 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
382 /* Raw alarm file for compatibility */
383 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
385 static struct attribute *lm90_attributes[] = {
386 &sensor_dev_attr_temp1_input.dev_attr.attr,
387 &sensor_dev_attr_temp2_input.dev_attr.attr,
388 &sensor_dev_attr_temp1_min.dev_attr.attr,
389 &sensor_dev_attr_temp2_min.dev_attr.attr,
390 &sensor_dev_attr_temp1_max.dev_attr.attr,
391 &sensor_dev_attr_temp2_max.dev_attr.attr,
392 &sensor_dev_attr_temp1_crit.dev_attr.attr,
393 &sensor_dev_attr_temp2_crit.dev_attr.attr,
394 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
395 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
397 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
398 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
399 &sensor_dev_attr_temp2_fault.dev_attr.attr,
400 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
401 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
402 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
403 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
404 &dev_attr_alarms.attr,
408 static const struct attribute_group lm90_group = {
409 .attrs = lm90_attributes,
412 /* pec used for ADM1032 only */
413 static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
416 struct i2c_client *client = to_i2c_client(dev);
417 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
420 static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
421 const char *buf, size_t count)
423 struct i2c_client *client = to_i2c_client(dev);
424 long val = simple_strtol(buf, NULL, 10);
428 client->flags &= ~I2C_CLIENT_PEC;
431 client->flags |= I2C_CLIENT_PEC;
440 static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
446 /* The ADM1032 supports PEC but not on write byte transactions, so we need
447 to explicitly ask for a transaction without PEC. */
448 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
450 return i2c_smbus_xfer(client->adapter, client->addr,
451 client->flags & ~I2C_CLIENT_PEC,
452 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
455 /* It is assumed that client->update_lock is held (unless we are in
456 detection or initialization steps). This matters when PEC is enabled,
457 because we don't want the address pointer to change between the write
458 byte and the read byte transactions. */
459 static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value)
463 if (client->flags & I2C_CLIENT_PEC) {
464 err = adm1032_write_byte(client, reg);
466 err = i2c_smbus_read_byte(client);
468 err = i2c_smbus_read_byte_data(client, reg);
471 dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
480 static int lm90_attach_adapter(struct i2c_adapter *adapter)
482 if (!(adapter->class & I2C_CLASS_HWMON))
484 return i2c_probe(adapter, &addr_data, lm90_detect);
488 * The following function does more than just detection. If detection
489 * succeeds, it also registers the new chip.
491 static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
493 struct i2c_client *new_client;
494 struct lm90_data *data;
496 const char *name = "";
498 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
501 if (!(data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
506 /* The common I2C client data is placed right before the
507 LM90-specific data. */
508 new_client = &data->client;
509 i2c_set_clientdata(new_client, data);
510 new_client->addr = address;
511 new_client->adapter = adapter;
512 new_client->driver = &lm90_driver;
513 new_client->flags = 0;
516 * Now we do the remaining detection. A negative kind means that
517 * the driver was loaded with no force parameter (default), so we
518 * must both detect and identify the chip. A zero kind means that
519 * the driver was loaded with the force parameter, the detection
520 * step shall be skipped. A positive kind means that the driver
521 * was loaded with the force parameter and a given kind of chip is
522 * requested, so both the detection and the identification steps
526 /* Default to an LM90 if forced */
530 if (kind < 0) { /* detection and identification */
531 int man_id, chip_id, reg_config1, reg_convrate;
533 if ((man_id = i2c_smbus_read_byte_data(new_client,
534 LM90_REG_R_MAN_ID)) < 0
535 || (chip_id = i2c_smbus_read_byte_data(new_client,
536 LM90_REG_R_CHIP_ID)) < 0
537 || (reg_config1 = i2c_smbus_read_byte_data(new_client,
538 LM90_REG_R_CONFIG1)) < 0
539 || (reg_convrate = i2c_smbus_read_byte_data(new_client,
540 LM90_REG_R_CONVRATE)) < 0)
543 if ((address == 0x4C || address == 0x4D)
544 && man_id == 0x01) { /* National Semiconductor */
547 if ((reg_config2 = i2c_smbus_read_byte_data(new_client,
548 LM90_REG_R_CONFIG2)) < 0)
551 if ((reg_config1 & 0x2A) == 0x00
552 && (reg_config2 & 0xF8) == 0x00
553 && reg_convrate <= 0x09) {
555 && (chip_id & 0xF0) == 0x20) { /* LM90 */
558 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
562 && (chip_id & 0xF0) == 0x10) { /* LM86 */
567 if ((address == 0x4C || address == 0x4D)
568 && man_id == 0x41) { /* Analog Devices */
569 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
570 && (reg_config1 & 0x3F) == 0x00
571 && reg_convrate <= 0x0A) {
574 if (chip_id == 0x51 /* ADT7461 */
575 && (reg_config1 & 0x1F) == 0x00 /* check compat mode */
576 && reg_convrate <= 0x0A) {
580 if (man_id == 0x4D) { /* Maxim */
582 * The MAX6657, MAX6658 and MAX6659 do NOT have a
583 * chip_id register. Reading from that address will
584 * return the last read value, which in our case is
585 * those of the man_id register. Likewise, the config1
586 * register seems to lack a low nibble, so the value
587 * will be those of the previous read, so in our case
588 * those of the man_id register.
590 if (chip_id == man_id
591 && (address == 0x4C || address == 0x4D)
592 && (reg_config1 & 0x1F) == (man_id & 0x0F)
593 && reg_convrate <= 0x09) {
596 /* The chip_id register of the MAX6680 and MAX6681
597 * holds the revision of the chip.
598 * the lowest bit of the config1 register is unused
599 * and should return zero when read, so should the
600 * second to last bit of config1 (software reset)
603 && (reg_config1 & 0x03) == 0x00
604 && reg_convrate <= 0x07) {
609 if (kind <= 0) { /* identification failed */
610 dev_info(&adapter->dev,
611 "Unsupported chip (man_id=0x%02X, "
612 "chip_id=0x%02X).\n", man_id, chip_id);
619 } else if (kind == adm1032) {
621 /* The ADM1032 supports PEC, but only if combined
622 transactions are not used. */
623 if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
624 new_client->flags |= I2C_CLIENT_PEC;
625 } else if (kind == lm99) {
627 } else if (kind == lm86) {
629 } else if (kind == max6657) {
631 } else if (kind == max6680) {
633 } else if (kind == adt7461) {
637 /* We can fill in the remaining client fields */
638 strlcpy(new_client->name, name, I2C_NAME_SIZE);
641 mutex_init(&data->update_lock);
643 /* Tell the I2C layer a new client has arrived */
644 if ((err = i2c_attach_client(new_client)))
647 /* Initialize the LM90 chip */
648 lm90_init_client(new_client);
650 /* Register sysfs hooks */
651 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group)))
653 if (new_client->flags & I2C_CLIENT_PEC) {
654 if ((err = device_create_file(&new_client->dev,
656 goto exit_remove_files;
658 if (data->kind != max6657) {
659 if ((err = device_create_file(&new_client->dev,
660 &sensor_dev_attr_temp2_offset.dev_attr)))
661 goto exit_remove_files;
664 data->hwmon_dev = hwmon_device_register(&new_client->dev);
665 if (IS_ERR(data->hwmon_dev)) {
666 err = PTR_ERR(data->hwmon_dev);
667 goto exit_remove_files;
673 sysfs_remove_group(&new_client->dev.kobj, &lm90_group);
674 device_remove_file(&new_client->dev, &dev_attr_pec);
676 i2c_detach_client(new_client);
683 static void lm90_init_client(struct i2c_client *client)
685 u8 config, config_orig;
686 struct lm90_data *data = i2c_get_clientdata(client);
689 * Start the conversions.
691 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
693 if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
694 dev_warn(&client->dev, "Initialization failed!\n");
697 config_orig = config;
700 * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
701 * 0.125 degree resolution) and range (0x08, extend range
702 * to -64 degree) mode for the remote temperature sensor.
704 if (data->kind == max6680) {
708 config &= 0xBF; /* run */
709 if (config != config_orig) /* Only write if changed */
710 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
713 static int lm90_detach_client(struct i2c_client *client)
715 struct lm90_data *data = i2c_get_clientdata(client);
718 hwmon_device_unregister(data->hwmon_dev);
719 sysfs_remove_group(&client->dev.kobj, &lm90_group);
720 device_remove_file(&client->dev, &dev_attr_pec);
721 if (data->kind != max6657)
722 device_remove_file(&client->dev,
723 &sensor_dev_attr_temp2_offset.dev_attr);
725 if ((err = i2c_detach_client(client)))
732 static struct lm90_data *lm90_update_device(struct device *dev)
734 struct i2c_client *client = to_i2c_client(dev);
735 struct lm90_data *data = i2c_get_clientdata(client);
737 mutex_lock(&data->update_lock);
739 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
742 dev_dbg(&client->dev, "Updating lm90 data.\n");
743 lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]);
744 lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]);
745 lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]);
746 lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]);
747 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]);
748 lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
751 * There is a trick here. We have to read two registers to
752 * have the remote sensor temperature, but we have to beware
753 * a conversion could occur inbetween the readings. The
754 * datasheet says we should either use the one-shot
755 * conversion register, which we don't want to do (disables
756 * hardware monitoring) or monitor the busy bit, which is
757 * impossible (we can't read the values and monitor that bit
758 * at the exact same time). So the solution used here is to
759 * read the high byte once, then the low byte, then the high
760 * byte again. If the new high byte matches the old one,
761 * then we have a valid reading. Else we have to read the low
762 * byte again, and now we believe we have a correct reading.
764 if (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0
765 && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0
766 && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0
768 || lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0))
769 data->temp11[0] = (newh << 8) | l;
771 if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0
772 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0)
773 data->temp11[1] = (newh << 8) | l;
774 if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
775 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
776 data->temp11[2] = (newh << 8) | l;
777 if (data->kind != max6657) {
778 if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
780 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
782 data->temp11[3] = (newh << 8) | l;
784 lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
786 data->last_updated = jiffies;
790 mutex_unlock(&data->update_lock);
795 static int __init sensors_lm90_init(void)
797 return i2c_add_driver(&lm90_driver);
800 static void __exit sensors_lm90_exit(void)
802 i2c_del_driver(&lm90_driver);
805 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
806 MODULE_DESCRIPTION("LM90/ADM1032 driver");
807 MODULE_LICENSE("GPL");
809 module_init(sensors_lm90_init);
810 module_exit(sensors_lm90_exit);