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Add PCA9545 driver, use on Gimlet + Sidecar
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at https://mozilla.org/MPL/2.0/. | ||
|
|
||
| //! Driver for the PCA9545 I2C mux | ||
| use crate::*; | ||
| use bitfield::bitfield; | ||
| use drv_i2c_api::{ResponseCode, Segment}; | ||
|
|
||
| pub struct Pca9545; | ||
|
|
||
| bitfield! { | ||
| #[derive(Copy, Clone, Eq, PartialEq)] | ||
| pub struct ControlRegister(u8); | ||
| channel3_enabled, set_channel3_enabled: 3; | ||
| channel2_enabled, set_channel2_enabled: 2; | ||
| channel1_enabled, set_channel1_enabled: 1; | ||
| channel0_enabled, set_channel0_enabled: 0; | ||
| } | ||
|
|
||
| impl I2cMuxDriver for Pca9545 { | ||
| fn configure( | ||
| &self, | ||
| mux: &I2cMux<'_>, | ||
| _controller: &I2cController<'_>, | ||
| gpio: &sys_api::Sys, | ||
| _ctrl: &I2cControl, | ||
| ) -> Result<(), drv_i2c_api::ResponseCode> { | ||
| mux.configure(gpio) | ||
| } | ||
|
|
||
| fn enable_segment( | ||
| &self, | ||
| mux: &I2cMux<'_>, | ||
| controller: &I2cController<'_>, | ||
| segment: Option<Segment>, | ||
| ctrl: &I2cControl, | ||
| ) -> Result<(), ResponseCode> { | ||
| let mut reg = ControlRegister(0); | ||
|
|
||
| if let Some(segment) = segment { | ||
| match segment { | ||
| Segment::S1 => { | ||
| reg.set_channel0_enabled(true); | ||
| } | ||
| Segment::S2 => { | ||
| reg.set_channel1_enabled(true); | ||
| } | ||
| Segment::S3 => { | ||
| reg.set_channel2_enabled(true); | ||
| } | ||
| Segment::S4 => { | ||
| reg.set_channel3_enabled(true); | ||
| } | ||
| _ => { | ||
| return Err(ResponseCode::SegmentNotFound); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // | ||
| // This part has but one register -- any write is to the control | ||
| // register. | ||
| // | ||
| match controller.write_read( | ||
| mux.address, | ||
| 1, | ||
| |_| Some(reg.0), | ||
| ReadLength::Fixed(0), | ||
| |_, _| Some(()), | ||
| ctrl, | ||
| ) { | ||
| Err(code) => Err(mux.error_code(code)), | ||
| _ => Ok(()), | ||
| } | ||
| } | ||
|
|
||
| fn reset( | ||
| &self, | ||
| mux: &I2cMux<'_>, | ||
| gpio: &sys_api::Sys, | ||
| ) -> Result<(), drv_i2c_api::ResponseCode> { | ||
| mux.reset(gpio) | ||
| } | ||
| } |