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| author | Shengtan Mao <stmao@google.com> | 2022-03-07 12:06:02 -0800 |
|---|---|---|
| committer | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2022-03-08 18:46:48 +0100 |
| commit | 648a488216837bda04114b700246011316b44478 (patch) | |
| tree | af18f2cad7fa2eca7725d277221cbdc0e1e67594 /hw/i2c | |
| parent | bf0e0c70924c725b7b778f6b870a72f789a359af (diff) | |
| download | focaccia-qemu-648a488216837bda04114b700246011316b44478.tar.gz focaccia-qemu-648a488216837bda04114b700246011316b44478.zip | |
hw/i2c: Added linear mode translation for pmbus devices
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>
Diffstat (limited to 'hw/i2c')
| -rw-r--r-- | hw/i2c/pmbus_device.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/hw/i2c/pmbus_device.c b/hw/i2c/pmbus_device.c index 8cb9db0f80..62885fa6a1 100644 --- a/hw/i2c/pmbus_device.c +++ b/hw/i2c/pmbus_device.c @@ -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) { |