diff options
| -rw-r--r-- | drivers/hwmon/adt7475.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c index 688b0a1..eac24c1 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; |