hwmon: (mr75203) fix voltage equation for negative source input

According to Moortec Embedded Voltage Monitor (MEVM) series 3 data
sheet, the minimum input signal is -100mv and maximum input signal
is +1000mv.

The equation used to convert the digital word to voltage uses mixed
types (*val signed and n unsigned), and on 64 bit machines also has
different size, since sizeof(u32) = 4 and sizeof(long) = 8.

So when measuring a negative input, n will be small enough, such that
PVT_N_CONST * n < PVT_R_CONST, and the result of
(PVT_N_CONST * n - PVT_R_CONST) will overflow to a very big positive
32 bit number. Then when storing the result in *val it will be the same
value just in 64 bit (instead of it representing a negative number which
will what happen when sizeof(long) = 4).

When -1023 <= (PVT_N_CONST * n - PVT_R_CONST) <= -1
dividing the number by 1024 should result of in 0, but because ">> 10"
is used, and the sign bit is used to fill the vacated bit positions, it
results in -1 (0xf...fffff) which is wrong.

This change fixes the sign problem and supports negative values by
casting n to long and replacing the shift right with div operation.

Fixes: e6dc6d6dd8bd ("hwmon: Add hardware monitoring driver for Moortec MR75203 PVT controller")
Signed-off-by: Eliav Farber <farbere@amazon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220908152449.35457-5-farbere@amazon.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index be02f32bf143ddd1013aace7d67cdefafeae0fa7..6d3b3c499ed83a9cb2f92d20a946149de202dcdd 100644 (file)
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -201,8 +201,18 @@ static int pvt_read_in(struct device *dev, u32 attr, int channel, long *val)
                        return ret;
 
                n &= SAMPLE_DATA_MSK;
-               /* Convert the N bitstream count into voltage */
-               *val = (PVT_N_CONST * n - PVT_R_CONST) >> PVT_CONV_BITS;
+               /*
+                * Convert the N bitstream count into voltage.
+                * To support negative voltage calculation for 64bit machines
+                * n must be cast to long, since n and *val differ both in
+                * signedness and in size.
+                * Division is used instead of right shift, because for signed
+                * numbers, the sign bit is used to fill the vacated bit
+                * positions, and if the number is negative, 1 is used.
+                * BIT(x) may not be used instead of (1 << x) because it's
+                * unsigned.
+                */
+               *val = (PVT_N_CONST * (long)n - PVT_R_CONST) / (1 << PVT_CONV_BITS);
 
                return 0;
        default: