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authorKun Yi <kunyi@google.com>2018-09-11 13:25:58 -0700
committerGuenter Roeck <linux@roeck-us.net>2018-10-10 20:37:13 -0700
commita54ca77a98a311bf0488fd9004c5b691454ff917 (patch)
tree0bb1f863c2a770bdbada476609d501f63f5c9925 /drivers/hwmon
parent39ea6ea325dcd05daf65f3d9d8d205a55683668f (diff)
downloadlinux-a54ca77a98a311bf0488fd9004c5b691454ff917.tar.bz2
hwmon: (lm75) Add MAX31725/6 support
MAX31725/MAX31726 are local temperature sensors with +/- 0.5 degree Celsius accuracy and 16-bit (0.00390625 degrees Celsius) resolution. They have a register mapping and encoding compatible with the lm75 series drivers. Address scan and extended temperature range are not supported by this patch. Tested on real hardware and verified temperature readings are correct. Signed-off-by: Kun Yi <kunyi@google.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/lm75.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 49f4b33a5685..e6e5a1080f09 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -47,6 +47,7 @@ enum lm75_type { /* keep sorted in alphabetical order */
lm75b,
max6625,
max6626,
+ max31725,
mcp980x,
stds75,
tcn75,
@@ -64,7 +65,6 @@ enum lm75_type { /* keep sorted in alphabetical order */
static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
-
/* The LM75 registers */
#define LM75_REG_TEMP 0x00
#define LM75_REG_CONF 0x01
@@ -76,7 +76,7 @@ struct lm75_data {
struct i2c_client *client;
struct regmap *regmap;
u8 orig_conf;
- u8 resolution; /* In bits, between 9 and 12 */
+ u8 resolution; /* In bits, between 9 and 16 */
u8 resolution_limits;
unsigned int sample_time; /* In ms */
};
@@ -339,6 +339,10 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
data->resolution_limits = 9;
data->sample_time = MSEC_PER_SEC / 4;
break;
+ case max31725:
+ data->resolution = 16;
+ data->sample_time = MSEC_PER_SEC / 8;
+ break;
case tcn75:
data->resolution = 9;
data->sample_time = MSEC_PER_SEC / 8;
@@ -415,6 +419,8 @@ static const struct i2c_device_id lm75_ids[] = {
{ "lm75b", lm75b, },
{ "max6625", max6625, },
{ "max6626", max6626, },
+ { "max31725", max31725, },
+ { "max31726", max31725, },
{ "mcp980x", mcp980x, },
{ "stds75", stds75, },
{ "tcn75", tcn75, },
@@ -472,6 +478,14 @@ static const struct of_device_id lm75_of_match[] = {
.data = (void *)max6626
},
{
+ .compatible = "maxim,max31725",
+ .data = (void *)max31725
+ },
+ {
+ .compatible = "maxim,max31726",
+ .data = (void *)max31725
+ },
+ {
.compatible = "maxim,mcp980x",
.data = (void *)mcp980x
},