From 648a488216837bda04114b700246011316b44478 Mon Sep 17 00:00:00 2001 From: Shengtan Mao Date: Mon, 7 Mar 2022 12:06:02 -0800 Subject: hw/i2c: Added linear mode translation for pmbus devices Signed-off-by: Shengtan Mao Reviewed-by: Titus Rwantare Reviewed-by: Philippe Mathieu-Daudé Acked-by: Corey Minyard Message-Id: <20220307200605.4001451-7-titusr@google.com> Signed-off-by: Philippe Mathieu-Daudé --- hw/i2c/pmbus_device.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'hw/i2c/pmbus_device.c') 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) { -- cgit v1.2.3-55-g7522