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hwmon: (lm90) Add support for max6695 and max6696 

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Guenter Roeck 2010-10-28 20:31:43 +02:00 committed by Jean Delvare
parent 6948708dd0
commit 06e1c0a216
3 changed files with 247 additions and 24 deletions
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17
Documentation/hwmon/lm90
View File

@ -84,6 +84,17 @@ Supported chips:
Addresses scanned: I2C 0x4c
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3500
* Maxim MAX6695
Prefix: 'max6695'
Addresses scanned: I2C 0x18
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/datasheet/index.mvp/id/4199
* Maxim MAX6696
Prefix: 'max6695'
Addresses scanned: I2C 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
0x4c, 0x4d and 0x4e
Datasheet: Publicly available at the Maxim website
http://www.maxim-ic.com/datasheet/index.mvp/id/4199
* Winbond/Nuvoton W83L771AWG/ASG
Prefix: 'w83l771'
Addresses scanned: I2C 0x4c
@ -152,6 +163,12 @@ MAX6680 and MAX6681:
* Selectable address
* Remote sensor type selection
MAX6695 and MAX6696:
* Better local resolution
* Selectable address (max6696)
* Second critical temperature limit
* Two remote sensors
W83L771AWG/ASG
* The AWG and ASG variants only differ in package format.
* Filter and alert configuration register at 0xBF

4
drivers/hwmon/Kconfig
View File

@ -614,8 +614,8 @@ config SENSORS_LM90
If you say yes here you get support for National Semiconductor LM90,
LM86, LM89 and LM99, Analog Devices ADM1032 and ADT7461, Maxim
MAX6646, MAX6647, MAX6648, MAX6649, MAX6657, MAX6658, MAX6659,
MAX6680, MAX6681 and MAX6692, and Winbond/Nuvoton W83L771AWG/ASG
sensor chips.
MAX6680, MAX6681, MAX6692, MAX6695, MAX6696, and Winbond/Nuvoton
W83L771AWG/ASG sensor chips.
This driver can also be built as a module. If so, the module
will be called lm90.

250
drivers/hwmon/lm90.c
View File

@ -44,6 +44,11 @@
* chips. The MAX6680 and MAX6681 only differ in the pinout so they can
* be treated identically.
*
* This driver also supports the MAX6695 and MAX6696, two other sensor
* chips made by Maxim. These are also quite similar to other Maxim
* chips, but support three temperature sensors instead of two. MAX6695
* and MAX6696 only differ in the pinout so they can be treated identically.
*
* This driver also supports the ADT7461 chip from Analog Devices.
* It's supported in both compatibility and extended mode. It is mostly
* compatible with LM90 except for a data format difference for the
@ -96,7 +101,7 @@ static const unsigned short normal_i2c[] = {
0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
max6646, w83l771 };
max6646, w83l771, max6696 };
/*
* The LM90 registers
@ -137,9 +142,10 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
#define LM90_REG_R_TCRIT_HYST 0x21
#define LM90_REG_W_TCRIT_HYST 0x21
/* MAX6646/6647/6649/6657/6658/6659 registers */
/* MAX6646/6647/6649/6657/6658/6659/6695/6696 registers */
#define MAX6657_REG_R_LOCAL_TEMPL 0x11
#define MAX6696_REG_R_STATUS2 0x12
#define MAX6659_REG_R_REMOTE_EMERG 0x16
#define MAX6659_REG_W_REMOTE_EMERG 0x16
#define MAX6659_REG_R_LOCAL_EMERG 0x17
@ -154,6 +160,8 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
#define LM90_HAVE_LOCAL_EXT (1 << 2) /* extended local temperature */
#define LM90_HAVE_REM_LIMIT_EXT (1 << 3) /* extended remote limit */
#define LM90_HAVE_EMERGENCY (1 << 4) /* 3rd upper (emergency) limit */
#define LM90_HAVE_EMERGENCY_ALARM (1 << 5)/* emergency alarm */
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
/*
* Functions declaration
@ -166,6 +174,9 @@ static void lm90_init_client(struct i2c_client *client);
static void lm90_alert(struct i2c_client *client, unsigned int flag);
static int lm90_remove(struct i2c_client *client);
static struct lm90_data *lm90_update_device(struct device *dev);
static inline void lm90_select_remote_channel(struct i2c_client *client,
struct lm90_data *data,
int channel);
/*
* Driver data (common to all clients)
@ -186,6 +197,8 @@ static const struct i2c_device_id lm90_id[] = {
{ "max6659", max6659 },
{ "max6680", max6680 },
{ "max6681", max6680 },
{ "max6695", max6696 },
{ "max6696", max6696 },
{ "w83l771", w83l771 },
{ }
};
@ -217,22 +230,29 @@ struct lm90_data {
int flags;
u8 config_orig; /* Original configuration register value */
u8 alert_alarms; /* Which alarm bits trigger ALERT# */
u16 alert_alarms; /* Which alarm bits trigger ALERT# */
/* Upper 8 bits for max6695/96 */
/* registers values */
s8 temp8[6]; /* 0: local low limit
s8 temp8[8]; /* 0: local low limit
1: local high limit
2: local critical limit
3: remote critical limit
4: local emergency limit (max6659 only)
5: remote emergency limit (max6659 only) */
s16 temp11[5]; /* 0: remote input
4: local emergency limit (max6659 and max6695/96)
5: remote emergency limit (max6659 and max6695/96)
6: remote 2 critical limit (max6695/96 only)
7: remote 2 emergency limit (max6695/96 only) */
s16 temp11[8]; /* 0: remote input
1: remote low limit
2: remote high limit
3: remote offset (except max6646 and max6657/58/59)
4: local input */
3: remote offset (except max6646, max6657/58/59,
and max6695/96)
4: local input
5: remote 2 input (max6695/96 only)
6: remote 2 low limit (max6695/96 only)
7: remote 2 high limit (ma6695/96 only) */
u8 temp_hyst;
u8 alarms; /* bitvector */
u16 alarms; /* bitvector (upper 8 bits for max6695/96) */
};
/*
@ -390,13 +410,15 @@ static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
static const u8 reg[6] = {
static const u8 reg[8] = {
LM90_REG_W_LOCAL_LOW,
LM90_REG_W_LOCAL_HIGH,
LM90_REG_W_LOCAL_CRIT,
LM90_REG_W_REMOTE_CRIT,
MAX6659_REG_W_LOCAL_EMERG,
MAX6659_REG_W_REMOTE_EMERG,
LM90_REG_W_REMOTE_CRIT,
MAX6659_REG_W_REMOTE_EMERG,
};
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
@ -421,7 +443,11 @@ static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
data->temp8[nr] = temp_to_u8(val);
else
data->temp8[nr] = temp_to_s8(val);
lm90_select_remote_channel(client, data, nr >= 6);
i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
lm90_select_remote_channel(client, data, 0);
mutex_unlock(&data->update_lock);
return count;
}
@ -453,10 +479,13 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
struct {
u8 high;
u8 low;
} reg[3] = {
{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL },
{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL },
{ LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL }
int channel;
} reg[5] = {
{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 0 },
{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 0 },
{ LM90_REG_W_REMOTE_OFFSH, LM90_REG_W_REMOTE_OFFSL, 0 },
{ LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL, 1 },
{ LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL, 1 }
};
struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(devattr);
@ -485,11 +514,14 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
else
data->temp11[index] = temp_to_s8(val) << 8;
lm90_select_remote_channel(client, data, reg[nr].channel);
i2c_smbus_write_byte_data(client, reg[nr].high,
data->temp11[index] >> 8);
if (data->flags & LM90_HAVE_REM_LIMIT_EXT)
i2c_smbus_write_byte_data(client, reg[nr].low,
data->temp11[index] & 0xff);
lm90_select_remote_channel(client, data, 0);
mutex_unlock(&data->update_lock);
return count;
}
@ -643,6 +675,62 @@ static const struct attribute_group lm90_emergency_group = {
.attrs = lm90_emergency_attributes,
};
static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 15);
static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 13);
static struct attribute *lm90_emergency_alarm_attributes[] = {
&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm90_emergency_alarm_group = {
.attrs = lm90_emergency_alarm_attributes,
};
/*
* Additional attributes for devices with 3 temperature sensors
*/
static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp11, NULL, 0, 5);
static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 3, 6);
static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp11,
set_temp11, 4, 7);
static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 6);
static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temphyst, NULL, 6);
static SENSOR_DEVICE_ATTR(temp3_emergency, S_IWUSR | S_IRUGO, show_temp8,
set_temp8, 7);
static SENSOR_DEVICE_ATTR(temp3_emergency_hyst, S_IRUGO, show_temphyst,
NULL, 7);
static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 12);
static SENSOR_DEVICE_ATTR(temp3_emergency_alarm, S_IRUGO, show_alarm, NULL, 14);
static struct attribute *lm90_temp3_attributes[] = {
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_crit.dev_attr.attr,
&sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_emergency.dev_attr.attr,
&sensor_dev_attr_temp3_emergency_hyst.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_emergency_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group lm90_temp3_group = {
.attrs = lm90_temp3_attributes,
};
/* pec used for ADM1032 only */
static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
char *buf)
@ -720,6 +808,30 @@ static int lm90_read_reg(struct i2c_client *client, u8 reg, u8 *value)
return 0;
}
/*
* client->update_lock must be held when calling this function (unless we are
* in detection or initialization steps), and while a remote channel other
* than channel 0 is selected. Also, calling code must make sure to re-select
* external channel 0 before releasing the lock. This is necessary because
* various registers have different meanings as a result of selecting a
* non-default remote channel.
*/
static inline void lm90_select_remote_channel(struct i2c_client *client,
struct lm90_data *data,
int channel)
{
u8 config;
if (data->kind == max6696) {
lm90_read_reg(client, LM90_REG_R_CONFIG1, &config);
config &= ~0x08;
if (channel)
config |= 0x08;
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
config);
}
}
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm90_detect(struct i2c_client *new_client,
struct i2c_board_info *info)
@ -794,6 +906,23 @@ static int lm90_detect(struct i2c_client *new_client,
}
} else
if (man_id == 0x4D) { /* Maxim */
int reg_emerg, reg_emerg2, reg_status2;
/*
* We read MAX6659_REG_R_REMOTE_EMERG twice, and re-read
* LM90_REG_R_MAN_ID in between. If MAX6659_REG_R_REMOTE_EMERG
* exists, both readings will reflect the same value. Otherwise,
* the readings will be different.
*/
if ((reg_emerg = i2c_smbus_read_byte_data(new_client,
MAX6659_REG_R_REMOTE_EMERG)) < 0
|| i2c_smbus_read_byte_data(new_client, LM90_REG_R_MAN_ID) < 0
|| (reg_emerg2 = i2c_smbus_read_byte_data(new_client,
MAX6659_REG_R_REMOTE_EMERG)) < 0
|| (reg_status2 = i2c_smbus_read_byte_data(new_client,
MAX6696_REG_R_STATUS2)) < 0)
return -ENODEV;
/*
* The MAX6657, MAX6658 and MAX6659 do NOT have a chip_id
* register. Reading from that address will return the last
@ -816,6 +945,24 @@ static int lm90_detect(struct i2c_client *new_client,
else
name = "max6659";
} else
/*
* Even though MAX6695 and MAX6696 do not have a chip ID
* register, reading it returns 0x01. Bit 4 of the config1
* register is unused and should return zero when read. Bit 0 of
* the status2 register is unused and should return zero when
* read.
*
* MAX6695 and MAX6696 have an additional set of temperature
* limit registers. We can detect those chips by checking if
* one of those registers exists.
*/
if (chip_id == 0x01
&& (reg_config1 & 0x10) == 0x00
&& (reg_status2 & 0x01) == 0x00
&& reg_emerg == reg_emerg2
&& reg_convrate <= 0x07) {
name = "max6696";
} else
/*
* The chip_id register of the MAX6680 and MAX6681 holds the
* revision of the chip. The lowest bit of the config1 register
@ -861,6 +1008,11 @@ static int lm90_detect(struct i2c_client *new_client,
static void lm90_remove_files(struct i2c_client *client, struct lm90_data *data)
{
if (data->flags & LM90_HAVE_TEMP3)
sysfs_remove_group(&client->dev.kobj, &lm90_temp3_group);
if (data->flags & LM90_HAVE_EMERGENCY_ALARM)
sysfs_remove_group(&client->dev.kobj,
&lm90_emergency_alarm_group);
if (data->flags & LM90_HAVE_EMERGENCY)
sysfs_remove_group(&client->dev.kobj,
&lm90_emergency_group);
@ -901,6 +1053,9 @@ static int lm90_probe(struct i2c_client *new_client,
case lm86:
data->alert_alarms = 0x7b;
break;
case max6696:
data->alert_alarms = 0x187c;
break;
default:
data->alert_alarms = 0x7c;
break;
@ -908,20 +1063,24 @@ static int lm90_probe(struct i2c_client *new_client,
/* Set chip capabilities */
if (data->kind != max6657 && data->kind != max6659
&& data->kind != max6646)
&& data->kind != max6646 && data->kind != max6696)
data->flags |= LM90_HAVE_OFFSET;
if (data->kind == max6657 || data->kind == max6659
|| data->kind == max6646)
|| data->kind == max6646 || data->kind == max6696)
data->flags |= LM90_HAVE_LOCAL_EXT;
if (data->kind != max6657 && data->kind != max6659
&& data->kind != max6646 && data->kind != max6680)
&& data->kind != max6646 && data->kind != max6680
&& data->kind != max6696)
data->flags |= LM90_HAVE_REM_LIMIT_EXT;
if (data->kind == max6659)
if (data->kind == max6659 || data->kind == max6696)
data->flags |= LM90_HAVE_EMERGENCY;
if (data->kind == max6696)
data->flags |= LM90_HAVE_EMERGENCY_ALARM | LM90_HAVE_TEMP3;
/* Initialize the LM90 chip */
lm90_init_client(new_client);
@ -946,6 +1105,18 @@ static int lm90_probe(struct i2c_client *new_client,
if (err)
goto exit_remove_files;
}
if (data->flags & LM90_HAVE_EMERGENCY_ALARM) {
err = sysfs_create_group(&new_client->dev.kobj,
&lm90_emergency_alarm_group);
if (err)
goto exit_remove_files;
}
if (data->flags & LM90_HAVE_TEMP3) {
err = sysfs_create_group(&new_client->dev.kobj,
&lm90_temp3_group);
if (err)
goto exit_remove_files;
}
data->hwmon_dev = hwmon_device_register(&new_client->dev);
if (IS_ERR(data->hwmon_dev)) {
@ -993,6 +1164,12 @@ static void lm90_init_client(struct i2c_client *client)
if (data->kind == max6680)
config |= 0x18;
/*
* Select external channel 0 for max6695/96
*/
if (data->kind == max6696)
config &= ~0x08;
config &= 0xBF; /* run */
if (config != data->config_orig) /* Only write if changed */
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
@ -1016,10 +1193,14 @@ static int lm90_remove(struct i2c_client *client)
static void lm90_alert(struct i2c_client *client, unsigned int flag)
{
struct lm90_data *data = i2c_get_clientdata(client);
u8 config, alarms;
u8 config, alarms, alarms2 = 0;
lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
if ((alarms & 0x7f) == 0) {
if (data->kind == max6696)
lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms2);
if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
dev_info(&client->dev, "Everything OK\n");
} else {
if (alarms & 0x61)
@ -1032,6 +1213,10 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag)
dev_warn(&client->dev,
"temp%d diode open, please check!\n", 2);
if (alarms2 & 0x18)
dev_warn(&client->dev,
"temp%d out of range, please check!\n", 3);
/* Disable ALERT# output, because these chips don't implement
SMBus alert correctly; they should only hold the alert line
low briefly. */
@ -1087,6 +1272,7 @@ static struct lm90_data *lm90_update_device(struct device *dev)
if (time_after(jiffies, data->last_updated + HZ / 2 + HZ / 10)
|| !data->valid) {
u8 h, l;
u8 alarms;
dev_dbg(&client->dev, "Updating lm90 data.\n");
lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[0]);
@ -1135,7 +1321,27 @@ static struct lm90_data *lm90_update_device(struct device *dev)
lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
&data->temp8[5]);
}
lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
data->alarms = alarms; /* save as 16 bit value */
if (data->kind == max6696) {
lm90_select_remote_channel(client, data, 1);
lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT,
&data->temp8[6]);
lm90_read_reg(client, MAX6659_REG_R_REMOTE_EMERG,
&data->temp8[7]);
lm90_read16(client, LM90_REG_R_REMOTE_TEMPH,
LM90_REG_R_REMOTE_TEMPL, &data->temp11[5]);
if (!lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h))
data->temp11[6] = h << 8;
if (!lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h))
data->temp11[7] = h << 8;
lm90_select_remote_channel(client, data, 0);
if (!lm90_read_reg(client, MAX6696_REG_R_STATUS2,
&alarms))
data->alarms |= alarms << 8;
}
/* Re-enable ALERT# output if it was originally enabled and
* relevant alarms are all clear */