hwmon: (adt7473) Fix voltage conversion routines

[linux-2.6-omap-h63xx.git] / drivers / hwmon / adt7473.c

diff --git a/drivers/hwmon/adt7473.c b/drivers/hwmon/adt7473.c
index ce4a7cb5a116ad59365aa846921926a92bd5fa17..b9a8ea30c99c822542682017fc40a4c83e99b4f7 100644 (file)
--- a/drivers/hwmon/adt7473.c
+++ b/drivers/hwmon/adt7473.c
@@ -39,32 +39,20 @@ I2C_CLIENT_INSMOD_1(adt7473);
 #define ADT7473_REG_BASE_ADDR                  0x20
 
 #define ADT7473_REG_VOLT_BASE_ADDR             0x21
-#define ADT7473_REG_VOLT_MAX_ADDR              0x22
 #define ADT7473_REG_VOLT_MIN_BASE_ADDR         0x46
-#define ADT7473_REG_VOLT_MIN_MAX_ADDR          0x49
 
 #define ADT7473_REG_TEMP_BASE_ADDR             0x25
-#define ADT7473_REG_TEMP_MAX_ADDR              0x27
 #define ADT7473_REG_TEMP_LIMITS_BASE_ADDR      0x4E
-#define ADT7473_REG_TEMP_LIMITS_MAX_ADDR       0x53
 #define ADT7473_REG_TEMP_TMIN_BASE_ADDR                0x67
-#define ADT7473_REG_TEMP_TMIN_MAX_ADDR         0x69
 #define ADT7473_REG_TEMP_TMAX_BASE_ADDR                0x6A
-#define ADT7473_REG_TEMP_TMAX_MAX_ADDR         0x6C
 
 #define ADT7473_REG_FAN_BASE_ADDR              0x28
-#define ADT7473_REG_FAN_MAX_ADDR               0x2F
 #define ADT7473_REG_FAN_MIN_BASE_ADDR          0x54
-#define ADT7473_REG_FAN_MIN_MAX_ADDR           0x5B
 
 #define ADT7473_REG_PWM_BASE_ADDR              0x30
-#define ADT7473_REG_PWM_MAX_ADDR               0x32
 #define        ADT7473_REG_PWM_MIN_BASE_ADDR           0x64
-#define ADT7473_REG_PWM_MIN_MAX_ADDR           0x66
 #define ADT7473_REG_PWM_MAX_BASE_ADDR          0x38
-#define ADT7473_REG_PWM_MAX_MAX_ADDR           0x3A
 #define ADT7473_REG_PWM_BHVR_BASE_ADDR         0x5C
-#define ADT7473_REG_PWM_BHVR_MAX_ADDR          0x5E
 #define                ADT7473_PWM_BHVR_MASK           0xE0
 #define                ADT7473_PWM_BHVR_SHIFT          5
 
@@ -102,7 +90,6 @@ I2C_CLIENT_INSMOD_1(adt7473);
 #define                ADT7473_FAN4_ALARM              0x20
 #define                ADT7473_R1T_SHORT               0x40
 #define                ADT7473_R2T_SHORT               0x80
-#define ADT7473_REG_MAX_ADDR                   0x80
 
 #define ALARM2(x)      ((x) << 8)
 
@@ -332,35 +319,24 @@ out:
 }
 
 /*
- * On this chip, voltages are given as a count of steps between a minimum
- * and maximum voltage, not a direct voltage.
+ * Conversions
  */
-static const int volt_convert_table[][2] = {
-       {2997, 3},
-       {4395, 4},
+
+/* IN are scaled acording to built-in resistors */
+static const int adt7473_scaling[] = {  /* .001 Volts */
+       2250, 3300
 };
+#define SCALE(val, from, to)   (((val) * (to) + ((from) / 2)) / (from))
 
 static int decode_volt(int volt_index, u8 raw)
 {
-       int cmax = volt_convert_table[volt_index][0];
-       int cmin = volt_convert_table[volt_index][1];
-       return ((raw * (cmax - cmin)) / 255) + cmin;
+       return SCALE(raw, 192, adt7473_scaling[volt_index]);
 }
 
 static u8 encode_volt(int volt_index, int cooked)
 {
-       int cmax = volt_convert_table[volt_index][0];
-       int cmin = volt_convert_table[volt_index][1];
-       u8 x;
-
-       if (cooked > cmax)
-               cooked = cmax;
-       else if (cooked < cmin)
-               cooked = cmin;
-
-       x = ((cooked - cmin) * 255) / (cmax - cmin);
-
-       return x;
+       int raw = SCALE(cooked, adt7473_scaling[volt_index], 192);
+       return SENSORS_LIMIT(raw, 0, 255);
 }
 
 static ssize_t show_volt_min(struct device *dev,
@@ -583,10 +559,9 @@ static ssize_t set_max_duty_at_crit(struct device *dev,
        struct i2c_client *client = to_i2c_client(dev);
        struct adt7473_data *data = i2c_get_clientdata(client);
        int temp = simple_strtol(buf, NULL, 10);
-       temp = temp && 0xFF;
 
        mutex_lock(&data->lock);
-       data->max_duty_at_overheat = temp;
+       data->max_duty_at_overheat = !!temp;
        reg = i2c_smbus_read_byte_data(client, ADT7473_REG_CFG4);
        if (temp)
                reg |= ADT7473_CFG4_MAX_DUTY_AT_OVT;