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hw/i2c: Added linear mode translation for pmbus devices

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Signed-off-by: Shengtan Mao <stmao@google.com>
Reviewed-by: Titus Rwantare <titusr@google.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Corey Minyard <cminyard@mvista.com>
Message-Id: <20220307200605.4001451-7-titusr@google.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Shengtan Mao 2022-03-07 12:06:02 -08:00 • committed by Philippe Mathieu-Daudé
parent bf0e0c7092
commit 648a488216
2 changed files with 37 additions and 1 deletions
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18
hw/i2c/pmbus_device.c
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@ -28,6 +28,24 @@ uint32_t pmbus_direct_mode2data(PMBusCoefficients c, uint16_t value)
return x;
}
uint16_t pmbus_data2linear_mode(uint16_t value, int exp)
{
/* L = D * 2^(-e) */
if (exp < 0) {
return value << (-exp);
}
return value >> exp;
}
uint16_t pmbus_linear_mode2data(uint16_t value, int exp)
{
/* D = L * 2^e */
if (exp < 0) {
return value >> (-exp);
}
return value << exp;
}
void pmbus_send(PMBusDevice *pmdev, const uint8_t *data, uint16_t len)
{
if (pmdev->out_buf_len + len > SMBUS_DATA_MAX_LEN) {