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-rw-r--r--drivers/hwmon/adt7475.c42
1 files changed, 36 insertions, 6 deletions
diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
index 688b0a1af5a..eac24c1361b 100644
--- a/drivers/hwmon/adt7475.c
+++ b/drivers/hwmon/adt7475.c
@@ -80,6 +80,8 @@
#define REG_TEMP_OFFSET_BASE 0x70
+#define REG_CONFIG2 0x73
+
#define REG_EXTEND1 0x76
#define REG_EXTEND2 0x77
@@ -92,11 +94,15 @@
#define REG_VTT_MIN 0x84 /* ADT7490 only */
#define REG_VTT_MAX 0x86 /* ADT7490 only */
+#define CONFIG2_ATTN 0x20
+
#define CONFIG3_SMBALERT 0x01
#define CONFIG3_THERM 0x02
#define CONFIG4_PINFUNC 0x03
#define CONFIG4_MAXDUTY 0x08
+#define CONFIG4_ATTN_IN10 0x30
+#define CONFIG4_ATTN_IN43 0xC0
#define CONFIG5_TWOSCOMP 0x01
#define CONFIG5_TEMPOFFSET 0x02
@@ -157,6 +163,7 @@ struct adt7475_data {
u8 config4;
u8 config5;
u8 has_voltage;
+ u8 bypass_attn; /* Bypass voltage attenuator */
u8 has_pwm2:1;
u8 has_fan4:1;
u32 alarms;
@@ -233,19 +240,24 @@ static const int adt7473_in_scaling[ADT7475_VOLTAGE_COUNT + 1][2] = {
{ 45, 45 }, /* Vtt */
};
-static inline int reg2volt(int channel, u16 reg)
+static inline int reg2volt(int channel, u16 reg, u8 bypass_attn)
{
const int *r = adt7473_in_scaling[channel];
+ if (bypass_attn & (1 << channel))
+ return DIV_ROUND_CLOSEST(reg * 2250, 1024);
return DIV_ROUND_CLOSEST(reg * (r[0] + r[1]) * 2250, r[1] * 1024);
}
-static inline u16 volt2reg(int channel, long volt)
+static inline u16 volt2reg(int channel, long volt, u8 bypass_attn)
{
const int *r = adt7473_in_scaling[channel];
long reg;
- reg = (volt * r[1] * 1024) / ((r[0] + r[1]) * 2250);
+ if (bypass_attn & (1 << channel))
+ reg = (volt * 1024) / 2250;
+ else
+ reg = (volt * r[1] * 1024) / ((r[0] + r[1]) * 2250);
return SENSORS_LIMIT(reg, 0, 1023) & (0xff << 2);
}
@@ -305,7 +317,8 @@ static ssize_t show_voltage(struct device *dev, struct device_attribute *attr,
(data->alarms >> sattr->index) & 1);
default:
val = data->voltage[sattr->nr][sattr->index];
- return sprintf(buf, "%d\n", reg2volt(sattr->index, val));
+ return sprintf(buf, "%d\n",
+ reg2volt(sattr->index, val, data->bypass_attn));
}
}
@@ -324,7 +337,8 @@ static ssize_t set_voltage(struct device *dev, struct device_attribute *attr,
mutex_lock(&data->lock);
- data->voltage[sattr->nr][sattr->index] = volt2reg(sattr->index, val);
+ data->voltage[sattr->nr][sattr->index] =
+ volt2reg(sattr->index, val, data->bypass_attn);
if (sattr->index < ADT7475_VOLTAGE_COUNT) {
if (sattr->nr == MIN)
@@ -1159,7 +1173,7 @@ static int adt7475_probe(struct i2c_client *client,
struct adt7475_data *data;
int i, ret = 0, revision;
- u8 config3;
+ u8 config2, config3;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (data == NULL)
@@ -1205,6 +1219,16 @@ static int adt7475_probe(struct i2c_client *client,
data->has_voltage |= (1 << 0); /* in0 */
}
+ /* Voltage attenuators can be bypassed, globally or individually */
+ config2 = adt7475_read(REG_CONFIG2);
+ if (config2 & CONFIG2_ATTN) {
+ data->bypass_attn = (0x3 << 3) | 0x3;
+ } else {
+ data->bypass_attn = ((data->config4 & CONFIG4_ATTN_IN10) >> 4) |
+ ((data->config4 & CONFIG4_ATTN_IN43) >> 3);
+ }
+ data->bypass_attn &= data->has_voltage;
+
/* Call adt7475_read_pwm for all pwm's as this will reprogram any
pwm's which are disabled to manual mode with 0% duty cycle */
for (i = 0; i < ADT7475_PWM_COUNT; i++)
@@ -1251,6 +1275,12 @@ static int adt7475_probe(struct i2c_client *client,
(data->has_voltage & (1 << 0)) ? " in0" : "",
data->has_fan4 ? " fan4" : "",
data->has_pwm2 ? " pwm2" : "");
+ if (data->bypass_attn)
+ dev_info(&client->dev, "Bypassing attenuators on:%s%s%s%s\n",
+ (data->bypass_attn & (1 << 0)) ? " in0" : "",
+ (data->bypass_attn & (1 << 1)) ? " in1" : "",
+ (data->bypass_attn & (1 << 3)) ? " in3" : "",
+ (data->bypass_attn & (1 << 4)) ? " in4" : "");
return 0;