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authorMichael Walle <michael@walle.cc>2016-07-25 11:12:05 +0200
committerGuenter Roeck <linux@roeck-us.net>2016-07-31 15:02:52 -0700
commit601807bbb7b422012492611b283bdf3647d3742c (patch)
treec382edb14f36c98bd93a2c96f614dccade0b9ff6 /drivers
parent5d17d3b4bbf3becb89fd48b74340a50a39736f6d (diff)
downloadlinux-601807bbb7b422012492611b283bdf3647d3742c.tar.bz2
hwmon: (adt7411) set sane values for CFG1 and CFG3
According to the datasheet we have to set some bits as 0 and others as 1. Make sure we do this for CFG1 and CFG3. Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hwmon/adt7411.c48
1 files changed, 44 insertions, 4 deletions
diff --git a/drivers/hwmon/adt7411.c b/drivers/hwmon/adt7411.c
index a7f886961830..fc1e65a263a4 100644
--- a/drivers/hwmon/adt7411.c
+++ b/drivers/hwmon/adt7411.c
@@ -30,6 +30,7 @@
#define ADT7411_REG_CFG1 0x18
#define ADT7411_CFG1_START_MONITOR (1 << 0)
+#define ADT7411_CFG1_RESERVED_BIT1 (1 << 1)
#define ADT7411_CFG1_RESERVED_BIT3 (1 << 3)
#define ADT7411_REG_CFG2 0x19
@@ -37,6 +38,9 @@
#define ADT7411_REG_CFG3 0x1a
#define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
+#define ADT7411_CFG3_RESERVED_BIT1 (1 << 1)
+#define ADT7411_CFG3_RESERVED_BIT2 (1 << 2)
+#define ADT7411_CFG3_RESERVED_BIT3 (1 << 3)
#define ADT7411_CFG3_REF_VDD (1 << 4)
#define ADT7411_REG_DEVICE_ID 0x4d
@@ -280,6 +284,45 @@ static int adt7411_detect(struct i2c_client *client,
return 0;
}
+static int adt7411_init_device(struct adt7411_data *data)
+{
+ int ret;
+ u8 val;
+
+ ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * We must only write zero to bit 1 and bit 2 and only one to bit 3
+ * according to the datasheet.
+ */
+ val = ret;
+ val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
+ val |= ADT7411_CFG3_RESERVED_BIT3;
+
+ ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * We must only write zero to bit 1 and only one to bit 3 according to
+ * the datasheet.
+ */
+ val = ret;
+ val &= ~ADT7411_CFG1_RESERVED_BIT1;
+ val |= ADT7411_CFG1_RESERVED_BIT3;
+
+ /* enable monitoring */
+ val |= ADT7411_CFG1_START_MONITOR;
+
+ return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
+}
+
static int adt7411_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -297,10 +340,7 @@ static int adt7411_probe(struct i2c_client *client,
mutex_init(&data->device_lock);
mutex_init(&data->update_lock);
- /* According to the datasheet, we must only write 1 to bit 3 */
- ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,
- ADT7411_CFG1_RESERVED_BIT3
- | ADT7411_CFG1_START_MONITOR, 1);
+ ret = adt7411_init_device(data);
if (ret < 0)
return ret;