提交 bd467e4e 编写于 作者: R Robert Lippert 提交者: Guenter Roeck

hwmon: (pmbus) Use 64bit math for DIRECT format values

Power values in the 100s of watt range can easily blow past
32bit math limits when processing everything in microwatts.

Use 64bit math instead to avoid these issues on common 32bit ARM
BMC platforms.

Fixes: 442aba78 ("hwmon: PMBus device driver")
Signed-off-by: NRobert Lippert <rlippert@google.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
上级 ed81cc61
master alk-4.19.24 alk-4.19.30 alk-4.19.34 alk-4.19.36 alk-4.19.43 alk-4.19.48 alk-4.19.57 ck-4.19.67 ck-4.19.81 ck-4.19.91 github/fork/deepanshu1422/fix-typo-in-comment github/fork/haosdent/fix-typo linux-next v4.19.91 v4.19.90 v4.19.89 v4.19.88 v4.19.87 v4.19.86 v4.19.85 v4.19.84 v4.19.83 v4.19.82 v4.19.81 v4.19.80 v4.19.79 v4.19.78 v4.19.77 v4.19.76 v4.19.75 v4.19.74 v4.19.73 v4.19.72 v4.19.71 v4.19.70 v4.19.69 v4.19.68 v4.19.67 v4.19.66 v4.19.65 v4.19.64 v4.19.63 v4.19.62 v4.19.61 v4.19.60 v4.19.59 v4.19.58 v4.19.57 v4.19.56 v4.19.55 v4.19.54 v4.19.53 v4.19.52 v4.19.51 v4.19.50 v4.19.49 v4.19.48 v4.19.47 v4.19.46 v4.19.45 v4.19.44 v4.19.43 v4.19.42 v4.19.41 v4.19.40 v4.19.39 v4.19.38 v4.19.37 v4.19.36 v4.19.35 v4.19.34 v4.19.33 v4.19.32 v4.19.31 v4.19.30 v4.19.29 v4.19.28 v4.19.27 v4.19.26 v4.19.25 v4.19.24 v4.19.23 v4.19.22 v4.19.21 v4.19.20 v4.19.19 v4.19.18 v4.19.17 v4.19.16 v4.19.15 v4.19.14 v4.19.13 v4.19.12 v4.19.11 v4.19.10 v4.19.9 v4.19.8 v4.19.7 v4.19.6 v4.19.5 v4.19.4 v4.19.3 v4.19.2 v4.19.1 v4.19 v4.19-rc8 v4.19-rc7 v4.19-rc6 v4.19-rc5 v4.19-rc4 v4.19-rc3 v4.19-rc2 v4.19-rc1 ck-release-21 ck-release-20 ck-release-19.2 ck-release-19.1 ck-release-19 ck-release-18 ck-release-17.2 ck-release-17.1 ck-release-17 ck-release-16 ck-release-15.1 ck-release-15 ck-release-14 ck-release-13.2 ck-release-13 ck-release-12 ck-release-11 ck-release-10 ck-release-9 ck-release-7 alk-release-15 alk-release-14 alk-release-13.2 alk-release-13 alk-release-12 alk-release-11 alk-release-10 alk-release-9 alk-release-7
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......@@ -21,6 +21,7 @@
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <linux/math64.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
......@@ -499,8 +500,8 @@ static long pmbus_reg2data_linear(struct pmbus_data *data,
static long pmbus_reg2data_direct(struct pmbus_data *data,
struct pmbus_sensor *sensor)
{
long val = (s16) sensor->data;
long m, b, R;
s64 b, val = (s16)sensor->data;
s32 m, R;
m = data->info->m[sensor->class];
b = data->info->b[sensor->class];
......@@ -528,11 +529,12 @@ static long pmbus_reg2data_direct(struct pmbus_data *data,
R--;
}
while (R < 0) {
val = DIV_ROUND_CLOSEST(val, 10);
val = div_s64(val + 5LL, 10L); /* round closest */
R++;
}
return (val - b) / m;
val = div_s64(val - b, m);
return clamp_val(val, LONG_MIN, LONG_MAX);
}
/*
......@@ -656,7 +658,8 @@ static u16 pmbus_data2reg_linear(struct pmbus_data *data,
static u16 pmbus_data2reg_direct(struct pmbus_data *data,
struct pmbus_sensor *sensor, long val)
{
long m, b, R;
s64 b, val64 = val;
s32 m, R;
m = data->info->m[sensor->class];
b = data->info->b[sensor->class];
......@@ -673,18 +676,18 @@ static u16 pmbus_data2reg_direct(struct pmbus_data *data,
R -= 3; /* Adjust R and b for data in milli-units */
b *= 1000;
}
val = val * m + b;
val64 = val64 * m + b;
while (R > 0) {
val *= 10;
val64 *= 10;
R--;
}
while (R < 0) {
val = DIV_ROUND_CLOSEST(val, 10);
val64 = div_s64(val64 + 5LL, 10L); /* round closest */
R++;
}
return val;
return (u16)clamp_val(val64, S16_MIN, S16_MAX);
}
static u16 pmbus_data2reg_vid(struct pmbus_data *data,
......
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