These Maxim chips are similar to MAX6657 but use unsigned temperature
values to allow for readings up to 145 degrees.
Signed-off-by: Ben Hutchings <bhutchings at solarflare.com>
---
Documentation/hwmon/lm90 | 15 +++++++++
drivers/hwmon/Kconfig | 3 +-
drivers/hwmon/lm90.c | 77 ++++++++++++++++++++++++++++++++++++++-------
3 files changed, 82 insertions(+), 13 deletions(-)
diff --git a/Documentation/hwmon/lm90 b/Documentation/hwmon/lm90
index 53cd829..e0d5206 100644
--- a/Documentation/hwmon/lm90
+++ b/Documentation/hwmon/lm90
@@ -32,6 +32,21 @@ Supported chips:
Addresses scanned: I2C 0x4c and 0x4d
Datasheet: Publicly available at the ON Semiconductor website
http://www.onsemi.com/PowerSolutions/product.do?id=ADT7461
+ * Maxim MAX6646
+ Prefix: 'max6646'
+ Addresses scanned: I2C 0x4d
+ Datasheet: Publicly available at the Maxim website
+ http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497
+ * Maxim MAX6647
+ Prefix: 'max6646'
+ Addresses scanned: I2C 0x4e
+ Datasheet: Publicly available at the Maxim website
+ http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497
+ * Maxim MAX6649
+ Prefix: 'max6646'
+ Addresses scanned: I2C 0x4c
+ Datasheet: Publicly available at the Maxim website
+ http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3497
* Maxim MAX6657
Prefix: 'max6657'
Addresses scanned: I2C 0x4c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 47a264f..03ba31e 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -495,7 +495,8 @@ config SENSORS_LM90
help
If you say yes here you get support for National Semiconductor LM90,
LM86, LM89 and LM99, Analog Devices ADM1032 and ADT7461, and Maxim
- MAX6657, MAX6658, MAX6659, MAX6680 and MAX6681 sensor chips.
+ MAX6646, MAX6647, MAX6649, MAX6657, MAX6658, MAX6659, MAX6680 and
+ MAX6681 sensor chips.
This driver can also be built as a module. If so, the module
will be called lm90.
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 85ba2c4..fe09f82 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -32,6 +32,11 @@
* supported by this driver. These chips lack the remote temperature
* offset feature.
*
+ * This driver also supports the MAX6646, MAX6647 and MAX6649 chips
+ * made by Maxim. These are again similar to the LM86, but they use
+ * unsigned temperature values and can report temperatures from 0 to
+ * 145 degrees.
+ *
* This driver also supports the MAX6680 and MAX6681, two other sensor
* chips made by Maxim. These are quite similar to the other Maxim
* chips. The MAX6680 and MAX6681 only differ in the pinout so they can
@@ -76,9 +81,10 @@
* Addresses to scan
* Address is fully defined internally and cannot be changed except for
* 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.
+ * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6649, MAX6657
+ * and MAX6658 have address 0x4c.
+ * ADM1032-2, ADT7461-2, LM89-1, LM99-1 and MAX6646 have address 0x4d.
+ * MAX6647 has address 0x4e.
* 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.
@@ -91,7 +97,8 @@ static const unsigned short normal_i2c[] = {
* Insmod parameters
*/
-I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);
+I2C_CLIENT_INSMOD_8(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680,
+ max6646);
/*
* The LM90 registers
@@ -132,7 +139,7 @@ I2C_CLIENT_INSMOD_7(lm90, adm1032, lm99, lm86, max6657, adt7461, max6680);
#define LM90_REG_R_TCRIT_HYST 0x21
#define LM90_REG_W_TCRIT_HYST 0x21
-/* MAX6657-specific registers */
+/* MAX6646/6647/6649/6657/6658/6659 registers */
#define MAX6657_REG_R_LOCAL_TEMPL 0x11
@@ -164,6 +171,9 @@ static const struct i2c_device_id lm90_id[] = {
{ "lm86", lm86 },
{ "lm89", lm99 },
{ "lm99", lm99 }, /* Missing temperature offset */
+ { "max6646", max6646 },
+ { "max6647", max6646 },
+ { "max6649", max6646 },
{ "max6657", max6657 },
{ "max6658", max6657 },
{ "max6659", max6657 },
@@ -205,7 +215,7 @@ struct lm90_data {
s16 temp11[5]; /* 0: remote input
1: remote low limit
2: remote high limit
- 3: remote offset (except max6657)
+ 3: remote offset (except max6646 and max6657)
4: local input */
u8 temp_hyst;
u8 alarms; /* bitvector */
@@ -216,7 +226,8 @@ struct lm90_data {
* For local temperatures and limits, critical limits and the hysteresis
* value, the LM90 uses signed 8-bit values with LSB = 1 degree Celsius.
* For remote temperatures and limits, it uses signed 11-bit values with
- * LSB = 0.125 degree Celsius, left-justified in 16-bit registers.
+ * LSB = 0.125 degree Celsius, left-justified in 16-bit registers. Some
+ * Maxim chips use unsigned values.
*/
static inline int temp_from_s8(s8 val)
@@ -224,11 +235,21 @@ static inline int temp_from_s8(s8 val)
return val * 1000;
}
+static inline int temp_from_u8(u8 val)
+{
+ return val * 1000;
+}
+
static inline int temp_from_s16(s16 val)
{
return val / 32 * 125;
}
+static inline int temp_from_u16(u16 val)
+{
+ return val / 32 * 125;
+}
+
static s8 temp_to_s8(long val)
{
if (val <= -128000)
@@ -240,6 +261,15 @@ static s8 temp_to_s8(long val)
return (val + 500) / 1000;
}
+static u8 temp_to_u8(long val)
+{
+ if (val <= 0)
+ return 0;
+ if (val >= 255000)
+ return 255;
+ return (val + 500) / 1000;
+}
+
static s16 temp_to_s16(long val)
{
if (val <= -128000)
@@ -331,6 +361,8 @@ static ssize_t show_temp8(struct device *dev, struct device_attribute *devattr,
if (data->kind == adt7461)
temp = temp_from_u8_adt7461(data, data->temp8[attr->index]);
+ else if (data->kind == max6646)
+ temp = temp_from_u8(data->temp8[attr->index]);
else
temp = temp_from_s8(data->temp8[attr->index]);
@@ -356,6 +388,8 @@ static ssize_t set_temp8(struct device *dev, struct device_attribute *devattr,
mutex_lock(&data->update_lock);
if (data->kind == adt7461)
data->temp8[nr] = temp_to_u8_adt7461(data, val);
+ else if (data->kind == max6646)
+ data->temp8[nr] = temp_to_u8(val);
else
data->temp8[nr] = temp_to_s8(val);
i2c_smbus_write_byte_data(client, reg[nr], data->temp8[nr]);
@@ -372,6 +406,8 @@ static ssize_t show_temp11(struct device *dev, struct device_attribute *devattr,
if (data->kind == adt7461)
temp = temp_from_u16_adt7461(data, data->temp11[attr->index]);
+ else if (data->kind == max6646)
+ temp = temp_from_u16(data->temp11[attr->index]);
else
temp = temp_from_s16(data->temp11[attr->index]);
@@ -401,12 +437,15 @@ static ssize_t set_temp11(struct device *dev, struct device_attribute *devattr,
data->temp11[nr] = temp_to_u16_adt7461(data, val);
else if (data->kind == max6657 || data->kind == max6680)
data->temp11[nr] = temp_to_s8(val) << 8;
+ else if (data->kind == max6646)
+ data->temp11[nr] = temp_to_u8(val) << 8;
else
data->temp11[nr] = temp_to_s16(val);
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2],
data->temp11[nr] >> 8);
- if (data->kind != max6657 && data->kind != max6680)
+ if (data->kind != max6657 && data->kind != max6680
+ && data->kind != max6646)
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
data->temp11[nr] & 0xff);
mutex_unlock(&data->update_lock);
@@ -689,6 +728,16 @@ static int lm90_detect(struct i2c_client *new_client, int kind,
&& (reg_config1 & 0x03) == 0x00
&& reg_convrate <= 0x07) {
kind = max6680;
+ } else
+ /* The chip_id register of the MAX6646/6647/6649
+ * holds the revision of the chip.
+ * The lowest 6 bits of the config1 register are
+ * unused and should return zero when read.
+ */
+ if (chip_id == 0x59
+ && (reg_config1 & 0x3f) == 0x00
+ && reg_convrate <= 0x07) {
+ kind = max6646;
}
}
@@ -719,6 +768,8 @@ static int lm90_detect(struct i2c_client *new_client, int kind,
name = "max6680";
} else if (kind == adt7461) {
name = "adt7461";
+ } else if (kind == max6646) {
+ name = "max6646";
}
strlcpy(info->type, name, I2C_NAME_SIZE);
@@ -758,7 +809,7 @@ static int lm90_probe(struct i2c_client *new_client,
&dev_attr_pec)))
goto exit_remove_files;
}
- if (data->kind != max6657) {
+ if (data->kind != max6657 && data->kind != max6646) {
if ((err = device_create_file(&new_client->dev,
&sensor_dev_attr_temp2_offset.dev_attr)))
goto exit_remove_files;
@@ -824,7 +875,7 @@ static int lm90_remove(struct i2c_client *client)
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)
+ if (data->kind != max6657 && data->kind != max6646)
device_remove_file(&client->dev,
&sensor_dev_attr_temp2_offset.dev_attr);
@@ -881,7 +932,7 @@ static struct lm90_data *lm90_update_device(struct device *dev)
lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[3]);
lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
- if (data->kind == max6657) {
+ if (data->kind == max6657 || data->kind == max6646) {
lm90_read16(client, LM90_REG_R_LOCAL_TEMP,
MAX6657_REG_R_LOCAL_TEMPL,
&data->temp11[4]);
@@ -896,6 +947,7 @@ static struct lm90_data *lm90_update_device(struct device *dev)
if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &h) == 0) {
data->temp11[1] = h << 8;
if (data->kind != max6657 && data->kind != max6680
+ && data->kind != max6646
&& lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL,
&l) == 0)
data->temp11[1] |= l;
@@ -903,12 +955,13 @@ static struct lm90_data *lm90_update_device(struct device *dev)
if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &h) == 0) {
data->temp11[2] = h << 8;
if (data->kind != max6657 && data->kind != max6680
+ && data->kind != max6646
&& lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL,
&l) == 0)
data->temp11[2] |= l;
}
- if (data->kind != max6657) {
+ if (data->kind != max6657 && data->kind != max6646) {
if (lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSH,
&h) == 0
&& lm90_read_reg(client, LM90_REG_R_REMOTE_OFFSL,
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
