2 * lm90.c - Part of lm_sensors, Linux kernel modules for hardware
4 * Copyright (C) 2003-2010 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.
16 * Note that there is no way to differentiate between both chips.
17 * When device is auto-detected, the driver will assume an LM99.
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. We use the device address to detect MAX6659, which will result
32 * in a detection as max6657 if it is on address 0x4c. The extra address
33 * and features of the MAX6659 are only supported if the chip is configured
34 * explicitly as max6659, or if its address is not 0x4c.
35 * These chips lack the remote temperature offset feature.
37 * This driver also supports the MAX6646, MAX6647, MAX6648, MAX6649 and
38 * MAX6692 chips made by Maxim. These are again similar to the LM86,
39 * but they use unsigned temperature values and can report temperatures
40 * from 0 to 145 degrees.
42 * This driver also supports the MAX6680 and MAX6681, two other sensor
43 * chips made by Maxim. These are quite similar to the other Maxim
44 * chips. The MAX6680 and MAX6681 only differ in the pinout so they can
45 * be treated identically.
47 * This driver also supports the MAX6695 and MAX6696, two other sensor
48 * chips made by Maxim. These are also quite similar to other Maxim
49 * chips, but support three temperature sensors instead of two. MAX6695
50 * and MAX6696 only differ in the pinout so they can be treated identically.
52 * This driver also supports ADT7461 and ADT7461A from Analog Devices as well as
53 * NCT1008 from ON Semiconductor. The chips are supported in both compatibility
54 * and extended mode. They are mostly compatible with LM90 except for a data
55 * format difference for the temperature value registers.
57 * This driver also supports the SA56004 from Philips. This device is
58 * pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
60 * Since the LM90 was the first chipset supported by this driver, most
61 * comments will refer to this chipset, but are actually general and
62 * concern all supported chipsets, unless mentioned otherwise.
64 * This program is free software; you can redistribute it and/or modify
65 * it under the terms of the GNU General Public License as published by
66 * the Free Software Foundation; either version 2 of the License, or
67 * (at your option) any later version.
69 * This program is distributed in the hope that it will be useful,
70 * but WITHOUT ANY WARRANTY; without even the implied warranty of
71 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
72 * GNU General Public License for more details.
74 * You should have received a copy of the GNU General Public License
75 * along with this program; if not, write to the Free Software
76 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
79 #include <linux/module.h>
80 #include <linux/init.h>
81 #include <linux/slab.h>
82 #include <linux/jiffies.h>
83 #include <linux/i2c.h>
84 #include <linux/hwmon-sysfs.h>
85 #include <linux/hwmon.h>
86 #include <linux/err.h>
87 #include <linux/mutex.h>
88 #include <linux/sysfs.h>
92 * Address is fully defined internally and cannot be changed except for
93 * MAX6659, MAX6680 and MAX6681.
94 * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
95 * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
96 * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
98 * MAX6647 has address 0x4e.
99 * MAX6659 can have address 0x4c, 0x4d or 0x4e.
100 * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
101 * 0x4c, 0x4d or 0x4e.
102 * SA56004 can have address 0x48 through 0x4F.
105 static const unsigned short normal_i2c[] = {
106 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
107 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
109 enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
110 max6646, w83l771, max6696, sa56004 };
116 #define LM90_REG_R_MAN_ID 0xFE
117 #define LM90_REG_R_CHIP_ID 0xFF
118 #define LM90_REG_R_CONFIG1 0x03
119 #define LM90_REG_W_CONFIG1 0x09
120 #define LM90_REG_R_CONFIG2 0xBF
121 #define LM90_REG_W_CONFIG2 0xBF
122 #define LM90_REG_R_CONVRATE 0x04
123 #define LM90_REG_W_CONVRATE 0x0A
124 #define LM90_REG_R_STATUS 0x02
125 #define LM90_REG_R_LOCAL_TEMP 0x00
126 #define LM90_REG_R_LOCAL_HIGH 0x05
127 #define LM90_REG_W_LOCAL_HIGH 0x0B
128 #define LM90_REG_R_LOCAL_LOW 0x06
129 #define LM90_REG_W_LOCAL_LOW 0x0C
130 #define LM90_REG_R_LOCAL_CRIT 0x20
131 #define LM90_REG_W_LOCAL_CRIT 0x20
132 #define LM90_REG_R_REMOTE_TEMPH 0x01
133 #define LM90_REG_R_REMOTE_TEMPL 0x10
134 #define LM90_REG_R_REMOTE_OFFSH 0x11
135 #define LM90_REG_W_REMOTE_OFFSH 0x11
136 #define LM90_REG_R_REMOTE_OFFSL 0x12
137 #define LM90_REG_W_REMOTE_OFFSL 0x12
138 #define LM90_REG_R_REMOTE_HIGHH 0x07
139 #define LM90_REG_W_REMOTE_HIGHH 0x0D
140 #define LM90_REG_R_REMOTE_HIGHL 0x13
141 #define LM90_REG_W_REMOTE_HIGHL 0x13
142 #define LM90_REG_R_REMOTE_LOWH 0x08
143 #define LM90_REG_W_REMOTE_LOWH 0x0E
144 #define LM90_REG_R_REMOTE_LOWL 0x14
145 #define LM90_REG_W_REMOTE_LOWL 0x14
146 #define LM90_REG_R_REMOTE_CRIT 0x19
147 #define LM90_REG_W_REMOTE_CRIT 0x19
148 #define LM90_REG_R_TCRIT_HYST 0x21
149 #define LM90_REG_W_TCRIT_HYST 0x21
151 /* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */
153 #define MAX6657_REG_R_LOCAL_TEMPL 0x11
154 #define MAX6696_REG_R_STATUS2 0x12
155 #define MAX6659_REG_R_REMOTE_EMERG 0x16
156 #define MAX6659_REG_W_REMOTE_EMERG 0x16
157 #define MAX6659_REG_R_LOCAL_EMERG 0x17
158 #define MAX6659_REG_W_LOCAL_EMERG 0x17
160 /* SA56004 registers */
162 #define SA56004_REG_R_LOCAL_TEMPL 0x22
164 #define LM90_DEF_CONVRATE_RVAL 6 /* Def conversion rate register value */
165 #define LM90_MAX_CONVRATE_MS 16000 /* Maximum conversion rate in ms */
170 #define LM90_FLAG_ADT7461_EXT (1 << 0) /* ADT7461 extended mode */
171 /* Device features */
172 #define LM90_HAVE_OFFSET (1 << 1) /* temperature offset register */
173 #define LM90_HAVE_LOCAL_EXT (1 << 2) /* extended local temperature */
174 #define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */
175 #define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */
176 #define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
177 #define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
178 #define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
181 * Driver data (common to all clients)
184 static const struct i2c_device_id lm90_id[] = {
185 { "adm1032", adm1032 },
186 { "adt7461", adt7461 },
187 { "adt7461a", adt7461 },
192 { "max6646", max6646 },
193 { "max6647", max6646 },
194 { "max6649", max6646 },
195 { "max6657", max6657 },
196 { "max6658", max6657 },
197 { "max6659", max6659 },
198 { "max6680", max6680 },
199 { "max6681", max6680 },
200 { "max6695", max6696 },
201 { "max6696", max6696 },
202 { "nct1008", adt7461 },
203 { "w83l771", w83l771 },
204 { "sa56004", sa56004 },
207 MODULE_DEVICE_TABLE(i2c, lm90_id);
210 * chip type specific parameters
213 u32 flags; /* Capabilities */
214 u16 alert_alarms; /* Which alarm bits trigger ALERT# */
215 /* Upper 8 bits for max6695/96 */
216 u8 max_convrate; /* Maximum conversion rate register value */
217 u8 reg_local_ext; /* Local extension register if
218 LM90_HAVE_LOCAL_EXT is set*/
221 static const struct lm90_params lm90_params[] = {
223 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
224 | LM90_HAVE_BROKEN_ALERT,
225 .alert_alarms = 0x7c,
229 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
230 | LM90_HAVE_BROKEN_ALERT,
231 .alert_alarms = 0x7c,
235 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
236 .alert_alarms = 0x7b,
240 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
241 .alert_alarms = 0x7b,
245 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
246 .alert_alarms = 0x7b,
250 .flags = LM90_HAVE_LOCAL_EXT,
251 .alert_alarms = 0x7c,
253 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
256 .flags = LM90_HAVE_LOCAL_EXT,
257 .alert_alarms = 0x7c,
259 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
262 .flags = LM90_HAVE_LOCAL_EXT | LM90_HAVE_EMERGENCY,
263 .alert_alarms = 0x7c,
265 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
268 .flags = LM90_HAVE_OFFSET,
269 .alert_alarms = 0x7c,
273 .flags = LM90_HAVE_LOCAL_EXT | LM90_HAVE_EMERGENCY
274 | LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3,
275 .alert_alarms = 0x187c,
277 .reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,
280 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT,
281 .alert_alarms = 0x7c,
285 .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT
286 | LM90_HAVE_LOCAL_EXT,
287 .alert_alarms = 0x7b,
289 .reg_local_ext = SA56004_REG_R_LOCAL_TEMPL,
294 * Client data (each client gets its own)
298 struct device *hwmon_dev;
299 struct mutex update_lock;
300 char valid; /* zero until following fields are valid */
301 unsigned long last_updated; /* in jiffies */
305 int update_interval; /* in milliseconds */
307 u8 config_orig; /* Original configuration register value */
308 u8 convrate_orig; /* Original conversion rate register value */
309 u16 alert_alarms; /* Which alarm bits trigger ALERT# */
310 /* Upper 8 bits for max6695/96 */
311 u8 max_convrate; /* Maximum conversion rate */
312 u8 reg_local_ext; /* local extension register offset */
314 /* registers values */
315 s8 temp8[8]; /* 0: local low limit
317 2: local critical limit
318 3: remote critical limit
319 4: local emergency limit (max6659 and max6695/96)
320 5: remote emergency limit (max6659 and max6695/96)
321 6: remote 2 critical limit (max6695/96 only)
322 7: remote 2 emergency limit (max6695/96 only) */
323 s16 temp11[8]; /* 0: remote input
326 3: remote offset (except max6646, max6657/58/59,
329 5: remote 2 input (max6695/96 only)
330 6: remote 2 low limit (max6695/96 only)
331 7: remote 2 high limit (ma6695/96 only) */
333 u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
341 * The ADM1032 supports PEC but not on write byte transactions, so we need
342 * to explicitly ask for a transaction without PEC.
344 static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
346 return i2c_smbus_xfer(client->adapter, client->addr,
347 client->flags & ~I2C_CLIENT_PEC,
348 I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
352 * It is assumed that client->update_lock is held (unless we are in
353 * detection or initialization steps). This matters when PEC is enabled,
354 * because we don't want the address pointer to change between the write
355 * byte and the read byte transactions.
357 static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
361 if (client->flags & I2C_CLIENT_PEC) {
362 err = adm1032_write_byte(client, reg);
364 err = i2c_smbus_read_byte(client);
366 err = i2c_smbus_read_byte_data(client, reg);
369 dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
378 static int lm90_read16(struct i2c_client *client, u8 regh, u8 regl, u16 *value)
384 * There is a trick here. We have to read two registers to have the
385 * sensor temperature, but we have to beware a conversion could occur
386 * between the readings. The datasheet says we should either use
387 * the one-shot conversion register, which we don't want to do
388 * (disables hardware monitoring) or monitor the busy bit, which is
389 * impossible (we can't read the values and monitor that bit at the
390 * exact same time). So the solution used here is to read the high
391 * byte once, then the low byte, then the high byte again. If the new
392 * high byte matches the old one, then we have a valid reading. Else
393 * we have to read the low byte again, and now we believe we have a
396 if ((err = lm90_read_reg(client, regh, &oldh))
397 || (err = lm90_read_reg(client, regl, &l))
398 || (err = lm90_read_reg(client, regh, &newh)))
401 err = lm90_read_reg(client, regl, &l);
405 *value = (newh << 8) | l;
411 * client->update_lock must be held when calling this function (unless we are
412 * in detection or initialization steps), and while a remote channel other
413 * than channel 0 is selected. Also, calling code must make sure to re-select
414 * external channel 0 before releasing the lock. This is necessary because
415 * various registers have different meanings as a result of selecting a
416 * non-default remote channel.
418 static inline void lm90_select_remote_channel(struct i2c_client *client,
419 struct lm90_data *data,
424 if (data->kind == max6696) {
425 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
429 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
435 * Set conversion rate.
436 * client->update_lock must be held when calling this function (unless we are
437 * in detection or initialization steps).
439 static void lm90_set_convrate(struct i2c_client *client, struct lm90_data *data,
440 unsigned int interval)
443 unsigned int update_interval;
445 /* Shift calculations to avoid rounding errors */
448 /* find the nearest update rate */
449 for (i = 0, update_interval = LM90_MAX_CONVRATE_MS << 6;
450 i < data->max_convrate; i++, update_interval >>= 1)
451 if (interval >= update_interval * 3 / 4)
454 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, i);
455 data->update_interval = DIV_ROUND_CLOSEST(update_interval, 64);
458 static struct lm90_data *lm90_update_device(struct device *dev)
460 struct i2c_client *client = to_i2c_client(dev);
461 struct lm90_data *data = i2c_get_clientdata(client);
462 unsigned long next_update;
464 mutex_lock(&data->update_lock);
466 next_update = data->last_updated
467 + msecs_to_jiffies(data->update_interval) + 1;
468 if (time_after(jiffies, next_update) || !data->valid) {
472 dev_dbg(&client->dev, "Updating lm90 data.\n");
473 lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
474 lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[1]);
475 lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[2]);
476 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
477 lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
479 if (data->flags & LM90_HAVE_LOCAL_EXT) {
480 lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
484 if (lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP,
486 data->temp11[4] = h << 8;
488 lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
489 LM90_REG_R_REMOTE_TEMPL, &data->temp11[0]);
491 if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
492 data->temp11[1] = h << 8;
493 if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
494 && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
496 data->temp11[1] |= l;
498 if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
499 data->temp11[2] = h << 8;
500 if ((data->flags & LM90_HAVE_REM_LIMIT_EXT)
501 && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
503 data->temp11[2] |= l;
506 if (data->flags & LM90_HAVE_OFFSET) {
507 if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
509 && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
511 data->temp11[3] = (h << 8) | l;
513 if (data->flags & LM90_HAVE_EMERGENCY) {
514 lm90_read_reg(client, MAX6659_REG_R_LOCAL_EMERG,
516 lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
519 lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
520 data->alarms = alarms; /* save as 16 bit value */
522 if (data->kind == max6696) {
523 lm90_select_remote_channel(client, data, 1);
524 lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
526 lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
528 lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
529 LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]);
530 if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
531 data->temp11[6] = h << 8;
532 if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
533 data->temp11[7] = h << 8;
534 lm90_select_remote_channel(client, data, 0);
536 if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
538 data->alarms |= alarms << 8;
541 /* Re-enable ALERT# output if it was originally enabled and
542 * relevant alarms are all clear */
543 if ((data->config_orig & 0x80) == 0
544 && (data->alarms & data->alert_alarms) == 0) {
547 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
549 dev_dbg(&client->dev, "Re-enabling ALERT#\n");
550 i2c_smbus_write_byte_data(client,
556 data->last_updated = jiffies;
560 mutex_unlock(&data->update_lock);
567 * For local temperatures and limits, critical limits and the hysteresis
568 * value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
569 * For remote temperatures and limits, it uses signed 11-bit values with
570 * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some
571 * Maxim chips use unsigned values.
574 static inline int temp_from_s8(s8 val)
579 static inline int temp_from_u8(u8 val)
584 static inline int temp_from_s16(s16 val)
586 return val / 32 * 125;
589 static inline int temp_from_u16(u16 val)
591 return val / 32 * 125;
594 static s8 temp_to_s8(long val)
601 return (val - 500) / 1000;
602 return (val + 500) / 1000;
605 static u8 temp_to_u8(long val)
611 return (val + 500) / 1000;
614 static s16 temp_to_s16(long val)
621 return (val - 62) / 125 * 32;
622 return (val + 62) / 125 * 32;
625 static u8 hyst_to_reg(long val)
631 return (val + 500) / 1000;
635 * ADT7461 in compatibility mode is almost identical to LM90 except that
636 * attempts to write values that are outside the range 0 < temp < 127 are
637 * treated as the boundary value.
639 * ADT7461 in "extended mode" operation uses unsigned integers offset by
640 * 64 (e.g., 0 -> -64 degC). The range is restricted to -64..191 degC.
642 static inline int temp_from_u8_adt7461(struct lm90_data *data, u8 val)
644 if (data->flags & LM90_FLAG_ADT7461_EXT)
645 return (val - 64) * 1000;
647 return temp_from_s8(val);
650 static inline int temp_from_u16_adt7461(struct lm90_data *data, u16 val)
652 if (data->flags & LM90_FLAG_ADT7461_EXT)
653 return (val - 0x4000) / 64 * 250;
655 return temp_from_s16(val);
658 static u8 temp_to_u8_adt7461(struct lm90_data *data, long val)
660 if (data->flags & LM90_FLAG_ADT7461_EXT) {
665 return (val + 500 + 64000) / 1000;
671 return (val + 500) / 1000;
675 static u16 temp_to_u16_adt7461(struct lm90_data *data, long val)
677 if (data->flags & LM90_FLAG_ADT7461_EXT) {
682 return (val + 64000 + 125) / 250 * 64;
688 return (val + 125) / 250 * 64;
696 static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
699 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
700 struct lm90_data *data = lm90_update_device(dev);
703 if (data->kind == adt7461)
704 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
705 else if (data->kind == max6646)
706 temp = temp_from_u8(data->temp8[attr->index]);
708 temp = temp_from_s8(data->temp8[attr->index]);
710 /* +16 degrees offset for temp2 for the LM99 */
711 if (data->kind == lm99 && attr->index == 3)
714 return sprintf(buf, "%d\n", temp);
717 static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
718 const char *buf, size_t count)
720 static const u8 reg[8] = {
721 LM90_REG_W_LOCAL_LOW,
722 LM90_REG_W_LOCAL_HIGH,
723 LM90_REG_W_LOCAL_CRIT,
724 LM90_REG_W_REMOTE_CRIT,
725 MAX6659_REG_W_LOCAL_EMERG,
726 MAX6659_REG_W_REMOTE_EMERG,
727 LM90_REG_W_REMOTE_CRIT,
728 MAX6659_REG_W_REMOTE_EMERG,
731 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
732 struct i2c_client *client = to_i2c_client(dev);
733 struct lm90_data *data = i2c_get_clientdata(client);
734 int nr = attr->index;
738 err = strict_strtol(buf, 10, &val);
742 /* +16 degrees offset for temp2 for the LM99 */
743 if (data->kind == lm99 && attr->index == 3)
746 mutex_lock(&data->update_lock);
747 if (data->kind == adt7461)
748 data->temp8[nr] = temp_to_u8_adt7461(data, val);
749 else if (data->kind == max6646)
750 data->temp8[nr] = temp_to_u8(val);
752 data->temp8[nr] = temp_to_s8(val);
754 lm90_select_remote_channel(client, data, nr >= 6);
755 i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
756 lm90_select_remote_channel(client, data, 0);
758 mutex_unlock(&data->update_lock);
762 static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
765 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
766 struct lm90_data *data = lm90_update_device(dev);
769 if (data->kind == adt7461)
770 temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
771 else if (data->kind == max6646)
772 temp = temp_from_u16(data->temp11[attr->index]);
774 temp = temp_from_s16(data->temp11[attr->index]);
776 /* +16 degrees offset for temp2 for the LM99 */
777 if (data->kind == lm99 && attr->index <= 2)
780 return sprintf(buf, "%d\n", temp);
783 static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
784 const char *buf, size_t count)
791 { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 },
792 { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 },
793 { LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 },
794 { LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 1 },
795 { LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 1 }
798 struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
799 struct i2c_client *client = to_i2c_client(dev);
800 struct lm90_data *data = i2c_get_clientdata(client);
802 int index = attr->index;
806 err = strict_strtol(buf, 10, &val);
810 /* +16 degrees offset for temp2 for the LM99 */
811 if (data->kind == lm99 && index <= 2)
814 mutex_lock(&data->update_lock);
815 if (data->kind == adt7461)
816 data->temp11[index] = temp_to_u16_adt7461(data, val);
817 else if (data->kind == max6646)
818 data->temp11[index] = temp_to_u8(val) << 8;
819 else if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
820 data->temp11[index] = temp_to_s16(val);
822 data->temp11[index] = temp_to_s8(val) << 8;
824 lm90_select_remote_channel(client, data, reg[nr].channel);
825 i2c_smbus_write_byte_data(client, reg[nr].high,
826 data->temp11[index] >> 8);
827 if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
828 i2c_smbus_write_byte_data(client, reg[nr].low,
829 data->temp11[index] & 0xff);
830 lm90_select_remote_channel(client, data, 0);
832 mutex_unlock(&data->update_lock);
836 static ssize_t show_temphyst(struct device *dev,
837 struct device_attribute *devattr,
840 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
841 struct lm90_data *data = lm90_update_device(dev);
844 if (data->kind == adt7461)
845 temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
846 else if (data->kind == max6646)
847 temp = temp_from_u8(data->temp8[attr->index]);
849 temp = temp_from_s8(data->temp8[attr->index]);
851 /* +16 degrees offset for temp2 for the LM99 */
852 if (data->kind == lm99 && attr->index == 3)
855 return sprintf(buf, "%d\n", temp - temp_from_s8(data->temp_hyst));
858 static ssize_t set_temphyst(struct device *dev, struct device_attribute *dummy,
859 const char *buf, size_t count)
861 struct i2c_client *client = to_i2c_client(dev);
862 struct lm90_data *data = i2c_get_clientdata(client);
867 err = strict_strtol(buf, 10, &val);
871 mutex_lock(&data->update_lock);
872 if (data->kind == adt7461)
873 temp = temp_from_u8_adt7461(data, data->temp8[2]);
874 else if (data->kind == max6646)
875 temp = temp_from_u8(data->temp8[2]);
877 temp = temp_from_s8(data->temp8[2]);
879 data->temp_hyst = hyst_to_reg(temp - val);
880 i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
882 mutex_unlock(&data->update_lock);
886 static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
889 struct lm90_data *data = lm90_update_device(dev);
890 return sprintf(buf, "%d\n", data->alarms);
893 static ssize_t show_alarm(struct device *dev, struct device_attribute
896 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
897 struct lm90_data *data = lm90_update_device(dev);
898 int bitnr = attr->index;
900 return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
903 static ssize_t show_update_interval(struct device *dev,
904 struct device_attribute *attr, char *buf)
906 struct lm90_data *data = dev_get_drvdata(dev);
908 return sprintf(buf, "%u\n", data->update_interval);
911 static ssize_t set_update_interval(struct device *dev,
912 struct device_attribute *attr,
913 const char *buf, size_t count)
915 struct i2c_client *client = to_i2c_client(dev);
916 struct lm90_data *data = i2c_get_clientdata(client);
920 err = strict_strtoul(buf, 10, &val);
924 mutex_lock(&data->update_lock);
925 lm90_set_convrate(client, data, val);
926 mutex_unlock(&data->update_lock);
931 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp11, NULL, 0, 4);
932 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp11, NULL, 0, 0);
933 static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
935 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp11,
937 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp8,
939 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp11,
941 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp8,
943 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp8,
945 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
947 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 3);
948 static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
951 /* Individual alarm files */
952 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
953 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
954 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
955 static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
956 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
957 static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
958 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
959 /* Raw alarm file for compatibility */
960 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
962 static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
963 set_update_interval);
965 static struct attribute *lm90_attributes[] = {
966 &sensor_dev_attr_temp1_input.dev_attr.attr,
967 &sensor_dev_attr_temp2_input.dev_attr.attr,
968 &sensor_dev_attr_temp1_min.dev_attr.attr,
969 &sensor_dev_attr_temp2_min.dev_attr.attr,
970 &sensor_dev_attr_temp1_max.dev_attr.attr,
971 &sensor_dev_attr_temp2_max.dev_attr.attr,
972 &sensor_dev_attr_temp1_crit.dev_attr.attr,
973 &sensor_dev_attr_temp2_crit.dev_attr.attr,
974 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
975 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
977 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
978 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
979 &sensor_dev_attr_temp2_fault.dev_attr.attr,
980 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
981 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
982 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
983 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
984 &dev_attr_alarms.attr,
985 &dev_attr_update_interval.attr,
989 static const struct attribute_group lm90_group = {
990 .attrs = lm90_attributes,
994 * Additional attributes for devices with emergency sensors
996 static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO, show_temp8,
998 static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO, show_temp8,
1000 static SENSOR_DEVICE_ATTR(temp1_emergency_hyst, S_IRUGO, show_temphyst,
1002 static SENSOR_DEVICE_ATTR(temp2_emergency_hyst, S_IRUGO, show_temphyst,
1005 static struct attribute *lm90_emergency_attributes[] = {
1006 &sensor_dev_attr_temp1_emergency.dev_attr.attr,
1007 &sensor_dev_attr_temp2_emergency.dev_attr.attr,
1008 &sensor_dev_attr_temp1_emergency_hyst.dev_attr.attr,
1009 &sensor_dev_attr_temp2_emergency_hyst.dev_attr.attr,
1013 static const struct attribute_group lm90_emergency_group = {
1014 .attrs = lm90_emergency_attributes,
1017 static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 15);
1018 static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 13);
1020 static struct attribute *lm90_emergency_alarm_attributes[] = {
1021 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
1022 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
1026 static const struct attribute_group lm90_emergency_alarm_group = {
1027 .attrs = lm90_emergency_alarm_attributes,
1031 * Additional attributes for devices with 3 temperature sensors
1033 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL, 0, 5);
1034 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11,
1036 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11,
1038 static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8,
1040 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL, 6);
1041 static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8,
1043 static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst,
1046 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
1047 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10);
1048 static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 11);
1049 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 12);
1050 static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO, show_alarm, NULL, 14);
1052 static struct attribute *lm90_temp3_attributes[] = {
1053 &sensor_dev_attr_temp3_input.dev_attr.attr,
1054 &sensor_dev_attr_temp3_min.dev_attr.attr,
1055 &sensor_dev_attr_temp3_max.dev_attr.attr,
1056 &sensor_dev_attr_temp3_crit.dev_attr.attr,
1057 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
1058 &sensor_dev_attr_temp3_emergency.dev_attr.attr,
1059 &sensor_dev_attr_temp3_emergency_hyst.dev_attr.attr,
1061 &sensor_dev_attr_temp3_fault.dev_attr.attr,
1062 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
1063 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
1064 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
1065 &sensor_dev_attr_temp3_emergency_alarm.dev_attr.attr,
1069 static const struct attribute_group lm90_temp3_group = {
1070 .attrs = lm90_temp3_attributes,
1073 /* pec used for ADM1032 only */
1074 static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
1077 struct i2c_client *client = to_i2c_client(dev);
1078 return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
1081 static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
1082 const char *buf, size_t count)
1084 struct i2c_client *client = to_i2c_client(dev);
1088 err = strict_strtol(buf, 10, &val);
1094 client->flags &= ~I2C_CLIENT_PEC;
1097 client->flags |= I2C_CLIENT_PEC;
1106 static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
1112 /* Return 0 if detection is successful, -ENODEV otherwise */
1113 static int lm90_detect(struct i2c_client *new_client,
1114 struct i2c_board_info *info)
1116 struct i2c_adapter *adapter = new_client->adapter;
1117 int address = new_client->addr;
1118 const char *name = NULL;
1119 int man_id, chip_id, reg_config1, reg_convrate;
1121 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
1124 /* detection and identification */
1125 if ((man_id = i2c_smbus_read_byte_data(new_client,
1126 LM90_REG_R_MAN_ID)) < 0
1127 || (chip_id = i2c_smbus_read_byte_data(new_client,
1128 LM90_REG_R_CHIP_ID)) < 0
1129 || (reg_config1 = i2c_smbus_read_byte_data(new_client,
1130 LM90_REG_R_CONFIG1)) < 0
1131 || (reg_convrate = i2c_smbus_read_byte_data(new_client,
1132 LM90_REG_R_CONVRATE)) < 0)
1135 if ((address == 0x4C || address == 0x4D)
1136 && man_id == 0x01) { /* National Semiconductor */
1139 reg_config2 = i2c_smbus_read_byte_data(new_client,
1140 LM90_REG_R_CONFIG2);
1141 if (reg_config2 < 0)
1144 if ((reg_config1 & 0x2A) == 0x00
1145 && (reg_config2 & 0xF8) == 0x00
1146 && reg_convrate <= 0x09) {
1148 && (chip_id & 0xF0) == 0x20) { /* LM90 */
1151 if ((chip_id & 0xF0) == 0x30) { /* LM89/LM99 */
1153 dev_info(&adapter->dev,
1154 "Assuming LM99 chip at 0x%02x\n",
1156 dev_info(&adapter->dev,
1157 "If it is an LM89, instantiate it "
1158 "with the new_device sysfs "
1162 && (chip_id & 0xF0) == 0x10) { /* LM86 */
1167 if ((address == 0x4C || address == 0x4D)
1168 && man_id == 0x41) { /* Analog Devices */
1169 if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
1170 && (reg_config1 & 0x3F) == 0x00
1171 && reg_convrate <= 0x0A) {
1173 /* The ADM1032 supports PEC, but only if combined
1174 transactions are not used. */
1175 if (i2c_check_functionality(adapter,
1176 I2C_FUNC_SMBUS_BYTE))
1177 info->flags |= I2C_CLIENT_PEC;
1179 if (chip_id == 0x51 /* ADT7461 */
1180 && (reg_config1 & 0x1B) == 0x00
1181 && reg_convrate <= 0x0A) {
1184 if (chip_id == 0x57 /* ADT7461A, NCT1008 */
1185 && (reg_config1 & 0x1B) == 0x00
1186 && reg_convrate <= 0x0A) {
1190 if (man_id == 0x4D) { /* Maxim */
1191 int reg_emerg, reg_emerg2, reg_status2;
1194 * We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read
1195 * LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG
1196 * exists, both readings will reflect the same value. Otherwise,
1197 * the readings will be different.
1199 if ((reg_emerg = i2c_smbus_read_byte_data(new_client,
1200 MAX6659_REG_R_REMOTE_EMERG)) < 0
1201 || i2c_smbus_read_byte_data(new_client, LM90_REG_R_MAN_ID) < 0
1202 || (reg_emerg2 = i2c_smbus_read_byte_data(new_client,
1203 MAX6659_REG_R_REMOTE_EMERG)) < 0
1204 || (reg_status2 = i2c_smbus_read_byte_data(new_client,
1205 MAX6696_REG_R_STATUS2)) < 0)
1209 * The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
1210 * register. Reading from that address will return the last
1211 * read value, which in our case is those of the man_id
1212 * register. Likewise, the config1 register seems to lack a
1213 * low nibble, so the value will be those of the previous
1214 * read, so in our case those of the man_id register.
1215 * MAX6659 has a third set of upper temperature limit registers.
1216 * Those registers also return values on MAX6657 and MAX6658,
1217 * thus the only way to detect MAX6659 is by its address.
1218 * For this reason it will be mis-detected as MAX6657 if its
1221 if (chip_id == man_id
1222 && (address == 0x4C || address == 0x4D || address == 0x4E)
1223 && (reg_config1 & 0x1F) == (man_id & 0x0F)
1224 && reg_convrate <= 0x09) {
1225 if (address == 0x4C)
1231 * Even though MAX6695 and MAX6696 do not have a chip ID
1232 * register, reading it returns 0x01. Bit 4 of the config1
1233 * register is unused and should return zero when read. Bit 0 of
1234 * the status2 register is unused and should return zero when
1237 * MAX6695 and MAX6696 have an additional set of temperature
1238 * limit registers. We can detect those chips by checking if
1239 * one of those registers exists.
1242 && (reg_config1 & 0x10) == 0x00
1243 && (reg_status2 & 0x01) == 0x00
1244 && reg_emerg == reg_emerg2
1245 && reg_convrate <= 0x07) {
1249 * The chip_id register of the MAX6680 and MAX6681 holds the
1250 * revision of the chip. The lowest bit of the config1 register
1251 * is unused and should return zero when read, so should the
1252 * second to last bit of config1 (software reset).
1255 && (reg_config1 & 0x03) == 0x00
1256 && reg_convrate <= 0x07) {
1260 * The chip_id register of the MAX6646/6647/6649 holds the
1261 * revision of the chip. The lowest 6 bits of the config1
1262 * register are unused and should return zero when read.
1265 && (reg_config1 & 0x3f) == 0x00
1266 && reg_convrate <= 0x07) {
1271 && man_id == 0x5C) { /* Winbond/Nuvoton */
1274 reg_config2 = i2c_smbus_read_byte_data(new_client,
1275 LM90_REG_R_CONFIG2);
1276 if (reg_config2 < 0)
1279 if ((reg_config1 & 0x2A) == 0x00
1280 && (reg_config2 & 0xF8) == 0x00) {
1281 if (chip_id == 0x01 /* W83L771W/G */
1282 && reg_convrate <= 0x09) {
1285 if ((chip_id & 0xFE) == 0x10 /* W83L771AWG/ASG */
1286 && reg_convrate <= 0x08) {
1291 if (man_id == 0xA1) { /* NXP Semiconductor/Philips */
1292 if (chip_id == 0x00 && address >= 0x48 && address <= 0x4F) {
1297 if (!name) { /* identification failed */
1298 dev_dbg(&adapter->dev,
1299 "Unsupported chip at 0x%02x (man_id=0x%02X, "
1300 "chip_id=0x%02X)\n", address, man_id, chip_id);
1304 strlcpy(info->type, name, I2C_NAME_SIZE);
1309 static void lm90_remove_files(struct i2c_client *client, struct lm90_data *data)
1311 if (data->flags & LM90_HAVE_TEMP3)
1312 sysfs_remove_group(&client->dev.kobj, &lm90_temp3_group);
1313 if (data->flags & LM90_HAVE_EMERGENCY_ALARM)
1314 sysfs_remove_group(&client->dev.kobj,
1315 &lm90_emergency_alarm_group);
1316 if (data->flags & LM90_HAVE_EMERGENCY)
1317 sysfs_remove_group(&client->dev.kobj,
1318 &lm90_emergency_group);
1319 if (data->flags & LM90_HAVE_OFFSET)
1320 device_remove_file(&client->dev,
1321 &sensor_dev_attr_temp2_offset.dev_attr);
1322 device_remove_file(&client->dev, &dev_attr_pec);
1323 sysfs_remove_group(&client->dev.kobj, &lm90_group);
1326 static void lm90_init_client(struct i2c_client *client)
1328 u8 config, convrate;
1329 struct lm90_data *data = i2c_get_clientdata(client);
1331 if (lm90_read_reg(client, LM90_REG_R_CONVRATE, &convrate) < 0) {
1332 dev_warn(&client->dev, "Failed to read convrate register!\n");
1333 convrate = LM90_DEF_CONVRATE_RVAL;
1335 data->convrate_orig = convrate;
1338 * Start the conversions.
1340 lm90_set_convrate(client, data, 500); /* 500ms; 2Hz conversion rate */
1341 if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
1342 dev_warn(&client->dev, "Initialization failed!\n");
1345 data->config_orig = config;
1347 /* Check Temperature Range Select */
1348 if (data->kind == adt7461) {
1350 data->flags |= LM90_FLAG_ADT7461_EXT;
1354 * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
1355 * 0.125 degree resolution) and range (0x08, extend range
1356 * to -64 degree) mode for the remote temperature sensor.
1358 if (data->kind == max6680)
1362 * Select external channel 0 for max6695/96
1364 if (data->kind == max6696)
1367 config &= 0xBF; /* run */
1368 if (config != data->config_orig) /* Only write if changed */
1369 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
1372 static int lm90_probe(struct i2c_client *new_client,
1373 const struct i2c_device_id *id)
1375 struct i2c_adapter *adapter = to_i2c_adapter(new_client->dev.parent);
1376 struct lm90_data *data;
1379 data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL);
1384 i2c_set_clientdata(new_client, data);
1385 mutex_init(&data->update_lock);
1387 /* Set the device type */
1388 data->kind = id->driver_data;
1389 if (data->kind == adm1032) {
1390 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
1391 new_client->flags &= ~I2C_CLIENT_PEC;
1394 /* Different devices have different alarm bits triggering the
1396 data->alert_alarms = lm90_params[data->kind].alert_alarms;
1398 /* Set chip capabilities */
1399 data->flags = lm90_params[data->kind].flags;
1401 /* Set maximum conversion rate */
1402 data->max_convrate = lm90_params[data->kind].max_convrate;
1404 if (data->flags & LM90_HAVE_LOCAL_EXT) {
1405 data->reg_local_ext = lm90_params[data->kind].reg_local_ext;
1406 WARN_ON(data->reg_local_ext == 0);
1409 /* Initialize the LM90 chip */
1410 lm90_init_client(new_client);
1412 /* Register sysfs hooks */
1413 err = sysfs_create_group(&new_client->dev.kobj, &lm90_group);
1416 if (new_client->flags & I2C_CLIENT_PEC) {
1417 err = device_create_file(&new_client->dev, &dev_attr_pec);
1419 goto exit_remove_files;
1421 if (data->flags & LM90_HAVE_OFFSET) {
1422 err = device_create_file(&new_client->dev,
1423 &sensor_dev_attr_temp2_offset.dev_attr);
1425 goto exit_remove_files;
1427 if (data->flags & LM90_HAVE_EMERGENCY) {
1428 err = sysfs_create_group(&new_client->dev.kobj,
1429 &lm90_emergency_group);
1431 goto exit_remove_files;
1433 if (data->flags & LM90_HAVE_EMERGENCY_ALARM) {
1434 err = sysfs_create_group(&new_client->dev.kobj,
1435 &lm90_emergency_alarm_group);
1437 goto exit_remove_files;
1439 if (data->flags & LM90_HAVE_TEMP3) {
1440 err = sysfs_create_group(&new_client->dev.kobj,
1443 goto exit_remove_files;
1446 data->hwmon_dev = hwmon_device_register(&new_client->dev);
1447 if (IS_ERR(data->hwmon_dev)) {
1448 err = PTR_ERR(data->hwmon_dev);
1449 goto exit_remove_files;
1455 lm90_remove_files(new_client, data);
1462 static int lm90_remove(struct i2c_client *client)
1464 struct lm90_data *data = i2c_get_clientdata(client);
1466 hwmon_device_unregister(data->hwmon_dev);
1467 lm90_remove_files(client, data);
1469 /* Restore initial configuration */
1470 i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
1471 data->convrate_orig);
1472 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
1479 static void lm90_alert(struct i2c_client *client, unsigned int flag)
1481 struct lm90_data *data = i2c_get_clientdata(client);
1482 u8 config, alarms, alarms2 = 0;
1484 lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
1486 if (data->kind == max6696)
1487 lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms2);
1489 if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
1490 dev_info(&client->dev, "Everything OK\n");
1493 dev_warn(&client->dev,
1494 "temp%d out of range, please check!\n", 1);
1496 dev_warn(&client->dev,
1497 "temp%d out of range, please check!\n", 2);
1499 dev_warn(&client->dev,
1500 "temp%d diode open, please check!\n", 2);
1503 dev_warn(&client->dev,
1504 "temp%d out of range, please check!\n", 3);
1506 /* Disable ALERT# output, because these chips don't implement
1507 SMBus alert correctly; they should only hold the alert line
1509 if ((data->flags & LM90_HAVE_BROKEN_ALERT)
1510 && (alarms & data->alert_alarms)) {
1511 dev_dbg(&client->dev, "Disabling ALERT#\n");
1512 lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
1513 i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
1519 static struct i2c_driver lm90_driver = {
1520 .class = I2C_CLASS_HWMON,
1524 .probe = lm90_probe,
1525 .remove = lm90_remove,
1526 .alert = lm90_alert,
1527 .id_table = lm90_id,
1528 .detect = lm90_detect,
1529 .address_list = normal_i2c,
1532 static int __init sensors_lm90_init(void)
1534 return i2c_add_driver(&lm90_driver);
1537 static void __exit sensors_lm90_exit(void)
1539 i2c_del_driver(&lm90_driver);
1542 MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
1543 MODULE_DESCRIPTION("LM90/ADM1032 driver");
1544 MODULE_LICENSE("GPL");
1546 module_init(sensors_lm90_init);
1547 module_exit(sensors_lm90_exit);