/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
- * Copyright (C) 2003-2005 Jean Delvare <khali@linux-fr.org>
+ * Copyright (C) 2003-2006 Jean Delvare <khali@linux-fr.org>
*
* Based on the lm83 driver. The LM90 is a sensor chip made by National
* Semiconductor. It reports up to two temperatures (its own plus up to
* http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2578
* Note that there is no easy way to differentiate between the three
* variants. The extra address and features of the MAX6659 are not
- * supported by this driver.
+ * supported by this driver. These chips lack the remote temperature
+ * offset feature.
+ *
+ * This driver also supports the MAX6680 and MAX6681, two other sensor
+ * chips made by Maxim. These are quite similar to the other Maxim
+ * chips. Complete datasheet can be obtained at:
+ * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3370
+ * The MAX6680 and MAX6681 only differ in the pinout so they can be
+ * treated identically.
*
* This driver also supports the ADT7461 chip from Analog Devices but
* only in its "compatability mode". If an ADT7461 chip is found but
#include <linux/hwmon.h>
#include <linux/err.h>
#include <linux/mutex.h>
+#include <linux/sysfs.h>
/*
* Addresses to scan
* Address is fully defined internally and cannot be changed except for
- * MAX6659.
+ * MAX6659, MAX6680 and MAX6681.
* LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658
* have address 0x4c.
* ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d.
* MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
+ * MAX6680 and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b,
+ * 0x4c, 0x4d or 0x4e.
*/
-static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END };
+static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
+ 0x29, 0x2a, 0x2b,
+ 0x4c, 0x4d, 0x4e,
+ I2C_CLIENT_END };
/*
* Insmod parameters
*/
-I2C_CLIENT_INSMOD_6(lm90, adm1032, lm99, lm86, max6657, adt7461);
+I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);
/*
* The LM90 registers
struct lm90_data {
struct i2c_client client;
- struct class_device *class_dev;
+ struct device *hwmon_dev;
struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
2: local high limit
3: local critical limit
4: remote critical limit */
- s16 temp11[3]; /* 0: remote input
+ s16 temp11[4]; /* 0: remote input
1: remote low limit
- 2: remote high limit */
+ 2: remote high limit
+ 3: remote offset (except max6657) */
u8 temp_hyst;
u8 alarms; /* bitvector */
};
static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
const char *buf, size_t count)
{
- static const u8 reg[4] = {
+ static const u8 reg[6] = {
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,
};
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
return sprintf(buf, "%d\n", data->alarms);
}
+static ssize_t show_alarm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct lm90_data *data = lm90_update_device(dev);
+ int bitnr = attr->index;
+
+ return sprintf(buf, "%d\n", (data->alarms >> bitnr) & 1);
+}
+
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp8, NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp11, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp8,
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temphyst,
set_temphyst, 3);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp2_offset, S_IWUSR | S_IRUGO, show_temp11,
+ set_temp11, 3);
+
+/* Individual alarm files */
+static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 2);
+static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 5);
+static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 6);
+/* Raw alarm file for compatibility */
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+static struct attribute *lm90_attributes[] = {
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp2_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_min.dev_attr.attr,
+ &sensor_dev_attr_temp2_min.dev_attr.attr,
+ &sensor_dev_attr_temp1_max.dev_attr.attr,
+ &sensor_dev_attr_temp2_max.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit.dev_attr.attr,
+ &sensor_dev_attr_temp2_crit.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
+ &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
+
+ &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_fault.dev_attr.attr,
+ &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
+ &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
+ &dev_attr_alarms.attr,
+ NULL
+};
+
+static const struct attribute_group lm90_group = {
+ .attrs = lm90_attributes,
+};
+
/* pec used for ADM1032 only */
static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
char *buf)
*/
/* The ADM1032 supports PEC but not on write byte transactions, so we need
- to explicitely ask for a transaction without PEC. */
+ to explicitly ask for a transaction without PEC. */
static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
{
return i2c_smbus_xfer(client->adapter, client->addr,
®_convrate) < 0)
goto exit_free;
- if (man_id == 0x01) { /* National Semiconductor */
+ if ((address == 0x4C || address == 0x4D)
+ && man_id == 0x01) { /* National Semiconductor */
u8 reg_config2;
if (lm90_read_reg(new_client, LM90_REG_R_CONFIG2,
}
}
} else
- if (man_id == 0x41) { /* Analog Devices */
+ if ((address == 0x4C || address == 0x4D)
+ && man_id == 0x41) { /* Analog Devices */
if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
&& (reg_config1 & 0x3F) == 0x00
&& reg_convrate <= 0x0A) {
} else
if (man_id == 0x4D) { /* Maxim */
/*
- * The Maxim variants do NOT have a chip_id register.
- * Reading from that address will return the last read
- * value, which in our case is those of the man_id
- * register. Likewise, the config1 register seems to
- * lack a low nibble, so the value will be those of the
- * previous read, so in our case those of the man_id
- * register.
+ * The MAX6657, MAX6658 and MAX6659 do NOT have a
+ * chip_id register. Reading from that address will
+ * return the last read value, which in our case is
+ * those of the man_id register. Likewise, the config1
+ * register seems to lack a low nibble, so the value
+ * will be those of the previous read, so in our case
+ * those of the man_id register.
*/
if (chip_id == man_id
+ && (address == 0x4C || address == 0x4D)
&& (reg_config1 & 0x1F) == (man_id & 0x0F)
&& reg_convrate <= 0x09) {
kind = max6657;
+ } else
+ /* The chip_id register of the MAX6680 and MAX6681
+ * holds the revision of the chip.
+ * the lowest bit of the config1 register is unused
+ * and should return zero when read, so should the
+ * second to last bit of config1 (software reset)
+ */
+ if (chip_id == 0x01
+ && (reg_config1 & 0x03) == 0x00
+ && reg_convrate <= 0x07) {
+ kind = max6680;
}
}
name = "lm86";
} else if (kind == max6657) {
name = "max6657";
+ } else if (kind == max6680) {
+ name = "max6680";
} else if (kind == adt7461) {
name = "adt7461";
}
lm90_init_client(new_client);
/* Register sysfs hooks */
- data->class_dev = hwmon_device_register(&new_client->dev);
- if (IS_ERR(data->class_dev)) {
- err = PTR_ERR(data->class_dev);
+ if ((err = sysfs_create_group(&new_client->dev.kobj, &lm90_group)))
goto exit_detach;
+ if (new_client->flags & I2C_CLIENT_PEC) {
+ if ((err = device_create_file(&new_client->dev,
+ &dev_attr_pec)))
+ goto exit_remove_files;
+ }
+ if (data->kind != max6657) {
+ if ((err = device_create_file(&new_client->dev,
+ &sensor_dev_attr_temp2_offset.dev_attr)))
+ goto exit_remove_files;
}
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_input.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_input.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_min.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_min.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_max.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_max.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_crit.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_crit.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp1_crit_hyst.dev_attr);
- device_create_file(&new_client->dev,
- &sensor_dev_attr_temp2_crit_hyst.dev_attr);
- device_create_file(&new_client->dev, &dev_attr_alarms);
-
- if (new_client->flags & I2C_CLIENT_PEC)
- device_create_file(&new_client->dev, &dev_attr_pec);
+ data->hwmon_dev = hwmon_device_register(&new_client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ goto exit_remove_files;
+ }
return 0;
+exit_remove_files:
+ sysfs_remove_group(&new_client->dev.kobj, &lm90_group);
+ device_remove_file(&new_client->dev, &dev_attr_pec);
exit_detach:
i2c_detach_client(new_client);
exit_free:
static void lm90_init_client(struct i2c_client *client)
{
- u8 config;
+ u8 config, config_orig;
+ struct lm90_data *data = i2c_get_clientdata(client);
/*
* Start the conversions.
dev_warn(&client->dev, "Initialization failed!\n");
return;
}
- if (config & 0x40)
- i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
- config & 0xBF); /* run */
+ config_orig = config;
+
+ /*
+ * Put MAX6680/MAX8881 into extended resolution (bit 0x10,
+ * 0.125 degree resolution) and range (0x08, extend range
+ * to -64 degree) mode for the remote temperature sensor.
+ */
+ if (data->kind == max6680) {
+ config |= 0x18;
+ }
+
+ config &= 0xBF; /* run */
+ if (config != config_orig) /* Only write if changed */
+ i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
static int lm90_detach_client(struct i2c_client *client)
struct lm90_data *data = i2c_get_clientdata(client);
int err;
- hwmon_device_unregister(data->class_dev);
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &lm90_group);
+ device_remove_file(&client->dev, &dev_attr_pec);
+ if (data->kind != max6657)
+ device_remove_file(&client->dev,
+ &sensor_dev_attr_temp2_offset.dev_attr);
if ((err = i2c_detach_client(client)))
return err;
if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
data->temp11[2] = (newh << 8) | l;
+ if (data->kind != max6657) {
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
+ &newh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
+ &l) == 0)
+ data->temp11[3] = (newh << 8) | l;
+ }
lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
data->last_updated = jiffies;
projects / linux-2.6-omap-h63xx.git / blobdiff