Add definitions, information, and code for ds1631 chip support
in the ds1621 driver.
Signed-off-by: Robert Coulson <rob.coulson@xxxxxxxxx>
---
drivers/hwmon/ds1621.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)
diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c
index efd4cca..d4f02a8 100644
--- a/drivers/hwmon/ds1621.c
+++ b/drivers/hwmon/ds1621.c
@@ -10,8 +10,8 @@
* resolution, a thermal alarm output (Tout), and user-defined minimum
* and maximum temperature thresholds (TH & TL).
*
- * The DS1625 & DS1721 are pin compatible with the DS1621 and similar
- * in operation, with slight variations as noted in the device
+ * The DS1625, DS1631, & DS1721 are pin compatible with the DS1621 and
+ * similar in operation, with slight variations as noted in the device
* datasheets (please refer to www.maximintegrated.com for specific
* device information).
*
@@ -51,7 +51,7 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
/* Supported devices */
-enum chips { ds1621, ds1625, ds1721 };
+enum chips { ds1621, ds1625, ds1631, ds1721 };
/* Insmod parameters */
static int polarity = -1;
@@ -69,6 +69,10 @@ MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low")
* 7 6 5 4 3 2 1 0
* |Done|THF |TLF |NVB | 1 | 0 |POL |1SHOT|
*
+ * - DS1631:
+ * 7 6 5 4 3 2 1 0
+ * |Done|THF |TLF |NVB | R1 | R0 |POL |1SHOT|
+ *
* - DS1721:
* 7 6 5 4 3 2 1 0
* |Done| X | X | U | R1 | R0 |POL |1SHOT|
@@ -139,8 +143,8 @@ static inline int DS1621_TEMP_FROM_REG(u16 reg)
/*
* TEMP: 0.001C/bit (-55C to +125C)
* REG:
- * - 1621, 1625: x = 0.5C
- * - 1721: x = 0.0625C
+ * - 1621, 1625: 0.5C/bit
+ * - 1631, 1721: 0.0625C/bit
* Assume highest resolution and let the bits fall where they may..
*/
static inline u16 DS1621_TEMP_TO_REG(long temp)
@@ -174,6 +178,7 @@ static void ds1621_init_client(struct i2c_client *client)
data->update_interval = DS1625_CONVERSION_MAX;
sreg = DS1621_COM_START;
break;
+ case ds1631:
case ds1721:
resol = (new_conf & DS1621_REG_CONFIG_RESOL) >>
DS1621_REG_CONFIG_RESOL_SHIFT;
@@ -344,7 +349,7 @@ static umode_t ds1621_attribute_visible(struct kobject *kobj,
devattr = container_of(attr, struct device_attribute, attr);
if (attr == &dev_attr_update_interval.attr)
- if (data->kind != ds1721)
+ if (data->kind == ds1621 || data->kind == ds1625)
/* shhh, we're hiding update_interval */
return 0;
return attr->mode;
@@ -378,7 +383,14 @@ static int ds1621_detect(struct i2c_client *client,
conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
if (conf < 0 || conf & DS1621_REG_CONFIG_NVB)
return -ENODEV;
- /* The 7 lowest bits of a temperature should always be 0. */
+ /*
+ * The ds1621 & ds1625 use 9-bit resolution, so the 7 lowest bits
+ * of the temperature should always be 0 (NOTE: The other chips
+ * have multi-resolution support, so if they have 9-bit resolution
+ * configured and the min/max temperature values set accordingly,
+ * then if not explicitly instantiated, they *will* appear as and
+ * emulate a ds1621 device).
+ */
for (i = 0; i < ARRAY_SIZE(DS1621_REG_TEMP); i++) {
temp = i2c_smbus_read_word_data(client, DS1621_REG_TEMP[i]);
if (temp < 0 || (temp & 0x7f00))
@@ -440,6 +452,7 @@ static int ds1621_remove(struct i2c_client *client)
static const struct i2c_device_id ds1621_id[] = {
{ "ds1621", ds1621 },
{ "ds1625", ds1625 },
+ { "ds1631", ds1631 },
{ "ds1721", ds1721 },
{ }
};
--
1.7.9.5
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