diff options
| author |   Guenter Roeck <guenter.roeck@ericsson.com> | 2011-09-28 11:36:20 -0700 |
|---|---|---|
| committer | Guenter Roeck <guenter.roeck@ericsson.com> | 2011-10-24 11:09:44 -0700 |
| commit | 1af1f5313cfea85a185c7bbb5258f7856fc8fea7 (patch) | |
| tree | acc73abb589337fec213c175a077edd8b743a994 /drivers/hwmon/pmbus | |
| parent | hwmon: (pmbus) Add support for Lineage Power DC-DC converters (diff) | |
| download | linux-dev-1af1f5313cfea85a185c7bbb5258f7856fc8fea7.tar.xz linux-dev-1af1f5313cfea85a185c7bbb5258f7856fc8fea7.zip | |
hwmon: (pmbus_core) Simplify sign extensions
Shift operations can be used for sign extensions. Use it.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
Diffstat (limited to 'drivers/hwmon/pmbus')
| -rw-r--r-- | drivers/hwmon/pmbus/pmbus_core.c | 17 |
1 files changed, 4 insertions, 13 deletions
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 814ebb198346..00460d8d8423 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -445,13 +445,8 @@ static long pmbus_reg2data_linear(struct pmbus_data *data, exponent = data->exponent; mantissa = (u16) sensor->data; } else { /* LINEAR11 */ - exponent = (sensor->data >> 11) & 0x001f; - mantissa = sensor->data & 0x07ff; - - if (exponent > 0x0f) - exponent |= 0xffe0; /* sign extend exponent */ - if (mantissa > 0x03ff) - mantissa |= 0xfffff800; /* sign extend mantissa */ + exponent = ((s16)sensor->data) >> 11; + mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5; } val = mantissa; @@ -1628,7 +1623,7 @@ static void pmbus_find_attributes(struct i2c_client *client, static int pmbus_identify_common(struct i2c_client *client, struct pmbus_data *data) { - int vout_mode = -1, exponent; + int vout_mode = -1; if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE)) vout_mode = _pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE); @@ -1642,11 +1637,7 @@ static int pmbus_identify_common(struct i2c_client *client, if (data->info->format[PSC_VOLTAGE_OUT] != linear) return -ENODEV; - exponent = vout_mode & 0x1f; - /* and sign-extend it */ - if (exponent & 0x10) - exponent |= ~0x1f; - data->exponent = exponent; + data->exponent = ((s8)(vout_mode << 3)) >> 3; break; case 1: /* VID mode */ if (data->info->format[PSC_VOLTAGE_OUT] != vid) |