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 .id = I2C_DRIVERID_LM90,
208 .attach_adapter = lm90_attach_adapter,
209 .detach_client = lm90_detach_client,
213 * Client data (each client gets its own)
217 struct i2c_client client;
218 struct device *hwmon_dev;
219 struct mutex update_lock;
220 char valid; /* zero until following fields are valid */
221 unsigned long last_updated; /* in jiffies */
224 /* registers values */
225 s8 temp8[5]; /* 0: local input
228 3: local critical limit
229 4: remote critical limit */
230 s16 temp11[4]; /* 0: remote input
233 3: remote offset (except max6657) */
235 u8 alarms; /* bitvector */
242 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
245 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
246 struct lm90_data *data = lm90_update_device(dev);
247 return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index]));
250 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
251 const char *buf, size_t count)
253 static const u8 reg[4] = {
254 LM90_REG_W_LOCAL_LOW,
255 LM90_REG_W_LOCAL_HIGH,
256 LM90_REG_W_LOCAL_CRIT,
257 LM90_REG_W_REMOTE_CRIT,
260 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
261 struct i2c_client *client = to_i2c_client(dev);
262 struct lm90_data *data = i2c_get_clientdata(client);
263 long val = simple_strtol(buf, NULL, 10);
264 int nr = attr->index;
266 mutex_lock(&data->update_lock);
267 if (data->kind == adt7461)
268 data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
270 data->temp8[nr] = TEMP1_TO_REG(val);
271 i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
272 mutex_unlock(&data->update_lock);
276 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
279 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
280 struct lm90_data *data = lm90_update_device(dev);
281 return sprintf(buf, "%d\n", TEMP2_FROM_REG(data->temp11[attr->index]));
284 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
285 const char *buf, size_t count)
287 static const u8 reg[6] = {
288 LM90_REG_W_REMOTE_LOWH,
289 LM90_REG_W_REMOTE_LOWL,
290 LM90_REG_W_REMOTE_HIGHH,
291 LM90_REG_W_REMOTE_HIGHL,
292 LM90_REG_W_REMOTE_OFFSH,
293 LM90_REG_W_REMOTE_OFFSL,
296 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
297 struct i2c_client *client = to_i2c_client(dev);
298 struct lm90_data *data = i2c_get_clientdata(client);
299 long val = simple_strtol(buf, NULL, 10);
300 int nr = attr->index;
302 mutex_lock(&data->update_lock);
303 if (data->kind == adt7461)
304 data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
306 data->temp11[nr] = TEMP2_TO_REG(val);
307 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
308 data->temp11[nr] >> 8);
309 i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
310 data->temp11[nr] & 0xff);
311 mutex_unlock(&data->update_lock);
315 static ssize_t show_temphyst(struct device *dev, struct device_attribute *devattr,
318 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
319 struct lm90_data *data = lm90_update_device(dev);
320 return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp8[attr->index])
321 - TEMP1_FROM_REG(data->temp_hyst));
324 static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
325 const char *buf, size_t count)
327 struct i2c_client *client = to_i2c_client(dev);
328 struct lm90_data *data = i2c_get_clientdata(client);
329 long val = simple_strtol(buf, NULL, 10);
332 mutex_lock(&data->update_lock);
333 hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
334 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
336 mutex_unlock(&data->update_lock);
340 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
343 struct lm90_data *data = lm90_update_device(dev);
344 return sprintf(buf, "%d\n", data->alarms);
347 static ssize_t show_alarm(struct device *dev, struct device_attribute
350 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
351 struct lm90_data *data = lm90_update_device(dev);
352 int bitnr = attr->index;
354 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
357 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
358 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
359 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
361 static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
363 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
365 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
367 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
369 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
371 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
373 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
374 static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
377 /* Individual alarm files */
378 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
379 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
380 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
381 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
382 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
383 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
384 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
385 /* Raw alarm file for compatibility */
386 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
388 static struct attribute *lm90_attributes[] = {
389 &sensor_dev_attr_temp1_input.dev_attr.attr,
390 &sensor_dev_attr_temp2_input.dev_attr.attr,
391 &sensor_dev_attr_temp1_min.dev_attr.attr,
392 &sensor_dev_attr_temp2_min.dev_attr.attr,
393 &sensor_dev_attr_temp1_max.dev_attr.attr,
394 &sensor_dev_attr_temp2_max.dev_attr.attr,
395 &sensor_dev_attr_temp1_crit.dev_attr.attr,
396 &sensor_dev_attr_temp2_crit.dev_attr.attr,
397 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
398 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
400 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
401 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
402 &sensor_dev_attr_temp2_fault.dev_attr.attr,
403 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
404 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
405 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
406 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
407 &dev_attr_alarms.attr,
411 static const struct attribute_group lm90_group = {
412 .attrs = lm90_attributes,
415 /* pec used for ADM1032 only */
416 static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
419 struct i2c_client *client = to_i2c_client(dev);
420 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
423 static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
424 const char *buf, size_t count)
426 struct i2c_client *client = to_i2c_client(dev);
427 long val = simple_strtol(buf, NULL, 10);
431 client->flags &= ~I2C_CLIENT_PEC;
434 client->flags |= I2C_CLIENT_PEC;
443 static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
449 /* The ADM1032 supports PEC but not on write byte transactions, so we need
450 to explicitly ask for a transaction without PEC. */
451 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
453 return i2c_smbus_xfer(client->adapter, client->addr,
454 client->flags & ~I2C_CLIENT_PEC,
455 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
458 /* It is assumed that client->update_lock is held (unless we are in
459 detection or initialization steps). This matters when PEC is enabled,
460 because we don't want the address pointer to change between the write
461 byte and the read byte transactions. */
462 static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value)
466 if (client->flags & I2C_CLIENT_PEC) {
467 err = adm1032_write_byte(client, reg);
469 err = i2c_smbus_read_byte(client);
471 err = i2c_smbus_read_byte_data(client, reg);
474 dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
483 static int lm90_attach_adapter(struct i2c_adapter *adapter)
485 if (!(adapter->class & I2C_CLASS_HWMON))
487 return i2c_probe(adapter, &addr_data, lm90_detect);
491 * The following function does more than just detection. If detection
492 * succeeds, it also registers the new chip.
494 static int lm90_detect(struct i2c_adapter *adapter, int address, int kind)
496 struct i2c_client *new_client;
497 struct lm90_data *data;
499 const char *name = "";
501 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
504 if (!(data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
509 /* The common I2C client data is placed right before the
510 LM90-specific data. */
511 new_client = &data->client;
512 i2c_set_clientdata(new_client, data);
513 new_client->addr = address;
514 new_client->adapter = adapter;
515 new_client->driver = &lm90_driver;
516 new_client->flags = 0;
519 * Now we do the remaining detection. A negative kind means that
520 * the driver was loaded with no force parameter (default), so we
521 * must both detect and identify the chip. A zero kind means that
522 * the driver was loaded with the force parameter, the detection
523 * step shall be skipped. A positive kind means that the driver
524 * was loaded with the force parameter and a given kind of chip is
525 * requested, so both the detection and the identification steps
529 /* Default to an LM90 if forced */
533 if (kind < 0) { /* detection and identification */
534 u8 man_id, chip_id, reg_config1, reg_convrate;
536 if (lm90_read_reg(new_client, LM90_REG_R_MAN_ID,
538 || lm90_read_reg(new_client, LM90_REG_R_CHIP_ID,
540 || lm90_read_reg(new_client, LM90_REG_R_CONFIG1,
542 || lm90_read_reg(new_client, LM90_REG_R_CONVRATE,
546 if ((address == 0x4C || address == 0x4D)
547 && man_id == 0x01) { /* National Semiconductor */
550 if (lm90_read_reg(new_client, LM90_REG_R_CONFIG2,
554 if ((reg_config1 & 0x2A) == 0x00
555 && (reg_config2 & 0xF8) == 0x00
556 && reg_convrate <= 0x09) {
558 && (chip_id & 0xF0) == 0x20) { /* LM90 */
561 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
565 && (chip_id & 0xF0) == 0x10) { /* LM86 */
570 if ((address == 0x4C || address == 0x4D)
571 && man_id == 0x41) { /* Analog Devices */
572 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
573 && (reg_config1 & 0x3F) == 0x00
574 && reg_convrate <= 0x0A) {
577 if (chip_id == 0x51 /* ADT7461 */
578 && (reg_config1 & 0x1F) == 0x00 /* check compat mode */
579 && reg_convrate <= 0x0A) {
583 if (man_id == 0x4D) { /* Maxim */
585 * The MAX6657, MAX6658 and MAX6659 do NOT have a
586 * chip_id register. Reading from that address will
587 * return the last read value, which in our case is
588 * those of the man_id register. Likewise, the config1
589 * register seems to lack a low nibble, so the value
590 * will be those of the previous read, so in our case
591 * those of the man_id register.
593 if (chip_id == man_id
594 && (address == 0x4C || address == 0x4D)
595 && (reg_config1 & 0x1F) == (man_id & 0x0F)
596 && reg_convrate <= 0x09) {
599 /* The chip_id register of the MAX6680 and MAX6681
600 * holds the revision of the chip.
601 * the lowest bit of the config1 register is unused
602 * and should return zero when read, so should the
603 * second to last bit of config1 (software reset)
606 && (reg_config1 & 0x03) == 0x00
607 && reg_convrate <= 0x07) {
612 if (kind <= 0) { /* identification failed */
613 dev_info(&adapter->dev,
614 "Unsupported chip (man_id=0x%02X, "
615 "chip_id=0x%02X).\n", man_id, chip_id);
622 } else if (kind == adm1032) {
624 /* The ADM1032 supports PEC, but only if combined
625 transactions are not used. */
626 if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
627 new_client->flags |= I2C_CLIENT_PEC;
628 } else if (kind == lm99) {
630 } else if (kind == lm86) {
632 } else if (kind == max6657) {
634 } else if (kind == max6680) {
636 } else if (kind == adt7461) {
640 /* We can fill in the remaining client fields */
641 strlcpy(new_client->name, name, I2C_NAME_SIZE);
644 mutex_init(&data->update_lock);
646 /* Tell the I2C layer a new client has arrived */
647 if ((err = i2c_attach_client(new_client)))
650 /* Initialize the LM90 chip */
651 lm90_init_client(new_client);
653 /* Register sysfs hooks */
654 if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group)))
656 if (new_client->flags & I2C_CLIENT_PEC) {
657 if ((err = device_create_file(&new_client->dev,
659 goto exit_remove_files;
661 if (data->kind != max6657) {
662 if ((err = device_create_file(&new_client->dev,
663 &sensor_dev_attr_temp2_offset.dev_attr)))
664 goto exit_remove_files;
667 data->hwmon_dev = hwmon_device_register(&new_client->dev);
668 if (IS_ERR(data->hwmon_dev)) {
669 err = PTR_ERR(data->hwmon_dev);
670 goto exit_remove_files;
676 sysfs_remove_group(&new_client->dev.kobj, &lm90_group);
677 device_remove_file(&new_client->dev, &dev_attr_pec);
679 i2c_detach_client(new_client);
686 static void lm90_init_client(struct i2c_client *client)
688 u8 config, config_orig;
689 struct lm90_data *data = i2c_get_clientdata(client);
692 * Start the conversions.
694 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
696 if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
697 dev_warn(&client->dev, "Initialization failed!\n");
700 config_orig = config;
703 * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
704 * 0.125 degree resolution) and range (0x08, extend range
705 * to -64 degree) mode for the remote temperature sensor.
707 if (data->kind == max6680) {
711 config &= 0xBF; /* run */
712 if (config != config_orig) /* Only write if changed */
713 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
716 static int lm90_detach_client(struct i2c_client *client)
718 struct lm90_data *data = i2c_get_clientdata(client);
721 hwmon_device_unregister(data->hwmon_dev);
722 sysfs_remove_group(&client->dev.kobj, &lm90_group);
723 device_remove_file(&client->dev, &dev_attr_pec);
724 if (data->kind != max6657)
725 device_remove_file(&client->dev,
726 &sensor_dev_attr_temp2_offset.dev_attr);
728 if ((err = i2c_detach_client(client)))
735 static struct lm90_data *lm90_update_device(struct device *dev)
737 struct i2c_client *client = to_i2c_client(dev);
738 struct lm90_data *data = i2c_get_clientdata(client);
740 mutex_lock(&data->update_lock);
742 if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
745 dev_dbg(&client->dev, "Updating lm90 data.\n");
746 lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]);
747 lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]);
748 lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]);
749 lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]);
750 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]);
751 lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
754 * There is a trick here. We have to read two registers to
755 * have the remote sensor temperature, but we have to beware
756 * a conversion could occur inbetween the readings. The
757 * datasheet says we should either use the one-shot
758 * conversion register, which we don't want to do (disables
759 * hardware monitoring) or monitor the busy bit, which is
760 * impossible (we can't read the values and monitor that bit
761 * at the exact same time). So the solution used here is to
762 * read the high byte once, then the low byte, then the high
763 * byte again. If the new high byte matches the old one,
764 * then we have a valid reading. Else we have to read the low
765 * byte again, and now we believe we have a correct reading.
767 if (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0
768 && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0
769 && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0
771 || lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0))
772 data->temp11[0] = (newh << 8) | l;
774 if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0
775 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0)
776 data->temp11[1] = (newh << 8) | l;
777 if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
778 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
779 data->temp11[2] = (newh << 8) | l;
780 if (data->kind != max6657) {
781 if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
783 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
785 data->temp11[3] = (newh << 8) | l;
787 lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
789 data->last_updated = jiffies;
793 mutex_unlock(&data->update_lock);
798 static int __init sensors_lm90_init(void)
800 return i2c_add_driver(&lm90_driver);
803 static void __exit sensors_lm90_exit(void)
805 i2c_del_driver(&lm90_driver);
808 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
809 MODULE_DESCRIPTION("LM90/ADM1032 driver");
810 MODULE_LICENSE("GPL");
812 module_init(sensors_lm90_init);
813 module_exit(sensors_lm90_exit);