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hwmon: (corsair-psu) Update calculation of LINEAR11 values

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Changes the way how LINEAR11 values are calculated. The new method
increases the precision of 2-3 digits.

old method:
	corsairpsu-hid-3-1
	Adapter: HID adapter
	v_in:        230.00 V
	v_out +12v:   12.00 V
	v_out +5v:     5.00 V
	v_out +3.3v:   3.00 V
	psu fan:        0 RPM
	vrm temp:     +44.0°C
	case temp:    +37.0°C
	power total: 152.00 W
	power +12v:  112.00 W
	power +5v:    38.00 W
	power +3.3v:   5.00 W
	curr in:          N/A
	curr +12v:     9.00 A
	curr +5v:      7.00 A
	curr +3.3v:  1000.00 mA

new method:
	corsairpsu-hid-3-1
	Adapter: HID adapter
	v_in:        230.00 V
	v_out +12v:   12.16 V
	v_out +5v:     5.01 V
	v_out +3.3v:   3.30 V
	psu fan:        0 RPM
	vrm temp:     +44.5°C
	case temp:    +37.8°C
	power total: 148.00 W
	power +12v:  108.00 W
	power +5v:    37.00 W
	power +3.3v:   4.50 W
	curr in:          N/A
	curr +12v:     9.25 A
	curr +5v:      7.50 A
	curr +3.3v:    1.50 A

Co-developed-by: Jack Doan <me@jackdoan.com>
Signed-off-by: Jack Doan <me@jackdoan.com>
Signed-off-by: Wilken Gottwalt <wilken.gottwalt@posteo.net>
Link: https://lore.kernel.org/r/YDoSMqFbgoTXyoru@monster.powergraphx.local
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Wilken Gottwalt 2021-02-27 10:34:42 +01:00 committed by Guenter Roeck
parent 77d76768d0
commit 918f22104d
1 changed files with 8 additions and 22 deletions
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30
drivers/hwmon/corsair-psu.c
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@ -119,27 +119,13 @@ struct corsairpsu_data {
};
/* some values are SMBus LINEAR11 data which need a conversion */
static int corsairpsu_linear11_to_int(const int val)
static int corsairpsu_linear11_to_int(const u16 val, const int scale)
{
int exp = (val & 0xFFFF) >> 0x0B;
int mant = val & 0x7FF;
int i;
const int exp = ((s16)val) >> 11;
const int mant = (((s16)(val & 0x7ff)) << 5) >> 5;
const int result = mant * scale;
if (exp > 0x0F)
exp -= 0x20;
if (mant > 0x3FF)
mant -= 0x800;
if ((mant & 0x01) == 1)
++mant;
if (exp < 0) {
for (i = 0; i < -exp; ++i)
mant /= 2;
} else {
for (i = 0; i < exp; ++i)
mant *= 2;
}
return mant;
return (exp >= 0) ? (result << exp) : (result >> -exp);
}
static int corsairpsu_usb_cmd(struct corsairpsu_data *priv, u8 p0, u8 p1, u8 p2, void *data)
@ -249,14 +235,14 @@ static int corsairpsu_get_value(struct corsairpsu_data *priv, u8 cmd, u8 rail, l
case PSU_CMD_RAIL_AMPS:
case PSU_CMD_TEMP0:
case PSU_CMD_TEMP1:
*val = corsairpsu_linear11_to_int(tmp & 0xFFFF) * 1000;
*val = corsairpsu_linear11_to_int(tmp & 0xFFFF, 1000);
break;
case PSU_CMD_FAN:
*val = corsairpsu_linear11_to_int(tmp & 0xFFFF);
*val = corsairpsu_linear11_to_int(tmp & 0xFFFF, 1);
break;
case PSU_CMD_RAIL_WATTS:
case PSU_CMD_TOTAL_WATTS:
*val = corsairpsu_linear11_to_int(tmp & 0xFFFF) * 1000000;
*val = corsairpsu_linear11_to_int(tmp & 0xFFFF, 1000000);
break;
case PSU_CMD_TOTAL_UPTIME:
case PSU_CMD_UPTIME: