Add some example usage of the device property read methods for DT/ACPI/swnode properties.
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| @@ -37,6 +37,9 @@ · 36 unmodified lines | |||
| 37 | test-device@2 { | 37 | test-device@2 { |
| 38 | compatible = "test,rust-device"; | 38 | compatible = "test,rust-device"; |
| 39 | reg = <0x2>; | 39 | reg = <0x2>; |
| 40 | |||
| 41 | test,u32-prop = <0xdeadbeef>; | ||
| 42 | test,i16-array = /bits/ 16 <1 2 (-3) (-4)>; | ||
| 40 | }; | 43 | }; |
| 41 | }; | 44 | }; |
| 42 | 45 | ||
| @@ -2,7 +2,14 @@ · 1 unmodified line | |||
| 2 | 2 | ||
| 3 | //! Rust Platform driver sample. | 3 | //! Rust Platform driver sample. |
| 4 | 4 | ||
| 5 | use kernel::{c_str, device::Core, of, platform, prelude::*, types::ARef}; | 5 | use kernel::{ |
| 6 | c_str, | ||
| 7 | device::{self, Core}, | ||
| 8 | of, platform, | ||
| 9 | prelude::*, | ||
| 10 | str::CString, | ||
| 11 | types::ARef, | ||
| 12 | }; | ||
| 6 | 13 | ||
| 7 | struct SampleDriver { | 14 | struct SampleDriver { |
| 8 | pdev: ARef<platform::Device>, | 15 | pdev: ARef<platform::Device>, |
| @@ -31,12 +38,63 @@ impl platform::Driver for SampleDriver { · 22 unmodified lines | |||
| 31 | dev_info!(pdev.as_ref(), "Probed with info: '{}'.\n", info.0); | 38 | dev_info!(pdev.as_ref(), "Probed with info: '{}'.\n", info.0); |
| 32 | } | 39 | } |
| 33 | 40 | ||
| 41 | Self::properties_parse(pdev.as_ref())?; | ||
| 42 | |||
| 34 | let drvdata = KBox::new(Self { pdev: pdev.into() }, GFP_KERNEL)?; | 43 | let drvdata = KBox::new(Self { pdev: pdev.into() }, GFP_KERNEL)?; |
| 35 | 44 | ||
| 36 | Ok(drvdata.into()) | 45 | Ok(drvdata.into()) |
| 37 | } | 46 | } |
| 38 | } | 47 | } |
| 39 | 48 | ||
| 49 | impl SampleDriver { | ||
| 50 | fn properties_parse(dev: &device::Device) -> Result { | ||
| 51 | let fwnode = dev.fwnode().ok_or(ENOENT)?; | ||
| 52 | |||
| 53 | if let Ok(idx) = | ||
| 54 | fwnode.property_match_string(c_str!("compatible"), c_str!("test,rust-device")) | ||
| 55 | { | ||
| 56 | dev_info!(dev, "matched compatible string idx = {}\n", idx); | ||
| 57 | } | ||
| 58 | |||
| 59 | let name = c_str!("compatible"); | ||
| 60 | let prop = fwnode.property_read::<CString>(name).required_by(dev)?; | ||
| 61 | dev_info!(dev, "'{name}'='{prop:?}'\n"); | ||
| 62 | |||
| 63 | let name = c_str!("test,bool-prop"); | ||
| 64 | let prop = fwnode.property_read_bool(c_str!("test,bool-prop")); | ||
| 65 | dev_info!(dev, "'{name}'='{prop}'\n"); | ||
| 66 | |||
| 67 | if fwnode.property_present(c_str!("test,u32-prop")) { | ||
| 68 | dev_info!(dev, "'test,u32-prop' is present\n"); | ||
| 69 | } | ||
| 70 | |||
| 71 | let name = c_str!("test,u32-optional-prop"); | ||
| 72 | let prop = fwnode.property_read::<u32>(name).or(0x12); | ||
| 73 | dev_info!(dev, "'{name}'='{prop:#x}' (default = 0x12)\n",); | ||
| 74 | |||
| 75 | // A missing required property will print an error. Discard the error to | ||
| 76 | // prevent properties_parse from failing in that case. | ||
| 77 | let name = c_str!("test,u32-required-prop"); | ||
| 78 | let _ = fwnode.property_read::<u32>(name).required_by(dev); | ||
| 79 | |||
| 80 | let name = c_str!("test,u32-prop"); | ||
| 81 | let prop: u32 = fwnode.property_read(name).required_by(dev)?; | ||
| 82 | dev_info!(dev, "'{name}'='{prop:#x}'\n"); | ||
| 83 | |||
| 84 | let name = c_str!("test,i16-array"); | ||
| 85 | let prop: [i16; 4] = fwnode.property_read(name).required_by(dev)?; | ||
| 86 | dev_info!(dev, "'{name}'='{prop:?}'\n"); | ||
| 87 | let len = fwnode.property_count_elem::<u16>(name)?; | ||
| 88 | dev_info!(dev, "'{name}' length is {len}\n",); | ||
| 89 | |||
| 90 | let name = c_str!("test,i16-array"); | ||
| 91 | let prop: KVec<i16> = fwnode.property_read_array_vec(name, 4)?.required_by(dev)?; | ||
| 92 | dev_info!(dev, "'{name}'='{prop:?}' (KVec)\n"); | ||
| 93 | |||
| 94 | Ok(()) | ||
| 95 | } | ||
| 96 | } | ||
| 97 | |||
| 40 | impl Drop for SampleDriver { | 98 | impl Drop for SampleDriver { |
| 41 | fn drop(&mut self) { | 99 | fn drop(&mut self) { |
| 42 | dev_dbg!(self.pdev.as_ref(), "Remove Rust Platform driver sample.\n"); | 100 | dev_dbg!(self.pdev.as_ref(), "Remove Rust Platform driver sample.\n"); |