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[219.104.132.38]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc46da5acabsm1204179a12.8.2026.09.06.01.46.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 06 Sep 2026 01:46:24 -0700 (PDT) From: Kohei Ito Date: Sun, 06 Sep 2026 17:45:51 +0900 Subject: [PATCH 3/3] sample: rust: Add GPIO consumer sample driver Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260906-add-rust-gpio-consumer-v1-3-24d192f93760@gmail.com> References: <20260906-add-rust-gpio-consumer-v1-0-24d192f93760@gmail.com> In-Reply-To: <20260906-add-rust-gpio-consumer-v1-0-24d192f93760@gmail.com> To: Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Daniel Almeida , Tamir Duberstein , Alexandre Courbot , =?utf-8?q?Onur_=C3=96zkan?= Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-gpio@vger.kernel.org, Kohei Ito X-Mailer: b4 0.15.2 Add a sample driver to demonstrate the use of the Rust GPIO APIs. Signed-off-by: Kohei Ito --- samples/rust/Kconfig | 11 +++ samples/rust/Makefile | 1 + samples/rust/rust_gpio_consumer.rs | 156 +++++++++++++++++++++++++++++++++++++ 3 files changed, 168 insertions(+) diff --git a/samples/rust/Kconfig b/samples/rust/Kconfig index c49ab9106345..1085d90c87f3 100644 --- a/samples/rust/Kconfig +++ b/samples/rust/Kconfig @@ -161,6 +161,17 @@ config SAMPLE_RUST_DRIVER_AUXILIARY If unsure, say N. +config SAMPLE_RUST_GPIO_CONSUMER + tristate "GPIO Consumer Driver" + depends on GPIOLIB + help + This option builds the Rust GPIO consumer sample. + + To compile this as a module, choose M here: + the module will be called rust_gpio_consumer. + + If unsure, say N. + config SAMPLE_RUST_SOC tristate "SoC Driver" select SOC_BUS diff --git a/samples/rust/Makefile b/samples/rust/Makefile index 6c0aaa58cccc..1cf181dea6d3 100644 --- a/samples/rust/Makefile +++ b/samples/rust/Makefile @@ -15,6 +15,7 @@ obj-$(CONFIG_SAMPLE_RUST_DRIVER_USB) += rust_driver_usb.o obj-$(CONFIG_SAMPLE_RUST_DRIVER_FAUX) += rust_driver_faux.o obj-$(CONFIG_SAMPLE_RUST_DRIVER_AUXILIARY) += rust_driver_auxiliary.o obj-$(CONFIG_SAMPLE_RUST_CONFIGFS) += rust_configfs.o +obj-$(CONFIG_SAMPLE_RUST_GPIO_CONSUMER) += rust_gpio_consumer.o obj-$(CONFIG_SAMPLE_RUST_SOC) += rust_soc.o rust_print-y := rust_print_main.o rust_print_events.o diff --git a/samples/rust/rust_gpio_consumer.rs b/samples/rust/rust_gpio_consumer.rs new file mode 100644 index 000000000000..b70b305126fc --- /dev/null +++ b/samples/rust/rust_gpio_consumer.rs @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! Rust GPIO consumer driver sample. + +use kernel::{ + device::{ + self, + Core, // + }, + gpio::{ + self, + consumer::{ + GpioDesc, + GpiodFlags, // + }, // + }, + of, + platform, + prelude::*, + time::{ + delay::fsleep, + Delta, // + }, // +}; + +struct SampleDriver; + +impl platform::Driver for SampleDriver { + type IdInfo = (); + type Data<'bound> = Self; + const OF_ID_TABLE: Option> = Some(&OF_TABLE); + + fn probe<'bound>( + pdev: &'bound platform::Device>, + _info: Option<&'bound Self::IdInfo>, + ) -> impl PinInit + 'bound { + let dev = pdev.as_ref(); + + dev_dbg!(dev, "Probe Rust GPIO consumer driver sample.\n"); + + Self::examine_gpio(dev)?; + + Ok(Self) + } +} + +type GetValue = fn(&GpioDesc) -> Result; +type GetRawValue = fn(&GpioDesc) -> Result; +type SetValue = fn(&GpioDesc, gpio::LogicalLineLevel) -> Result<()>; +type SetRawValue = fn(&GpioDesc, gpio::PhysicalLineLevel) -> Result<()>; + +impl SampleDriver { + fn examine_gpio(dev: &device::Device) -> Result { + let gpiod = GpioDesc::get(dev, None, GpiodFlags::ASIS)?; + + let cansleep = gpiod.cansleep()?; + let (get_value, get_raw_value, set_value, set_raw_value): ( + GetValue, + GetRawValue, + SetValue, + SetRawValue, + ) = if cansleep { + ( + |gpiod| gpiod.get_value_cansleep(), + |gpiod| gpiod.get_raw_value_cansleep(), + |gpiod, value| gpiod.set_value_cansleep(value), + |gpiod, value| gpiod.set_raw_value_cansleep(value), + ) + } else { + ( + |gpiod| gpiod.get_value(), + |gpiod| gpiod.get_raw_value(), + |gpiod, value| gpiod.set_value(value), + |gpiod, value| gpiod.set_raw_value(value), + ) + }; + + let pr_status = || -> Result<()> { + dev_info!( + dev, + "direction: {}, value: {}, raw value: {}\n", + gpiod.get_direction()?, + get_value(&gpiod)?, + get_raw_value(&gpiod)? + ); + Ok(()) + }; + + let active_low = gpiod.is_active_low()?; + + dev_info!( + dev, + "got the GPIO ({}{})\n", + if active_low { + "active low" + } else { + "active high" + }, + if cansleep { ", sleepy" } else { "" } + ); + pr_status()?; + + gpiod.direction_output(gpio::LogicalLineLevel::Inactive)?; + dev_info!(dev, "line is inactivated\n"); + pr_status()?; + + fsleep(Delta::from_millis(1)); + + set_value(&gpiod, gpio::LogicalLineLevel::Active)?; + dev_info!(dev, "line is activated\n"); + pr_status()?; + + fsleep(Delta::from_millis(1)); + + set_value(&gpiod, gpio::LogicalLineLevel::Inactive)?; + dev_info!(dev, "GPIO: line is inactivated\n"); + pr_status()?; + + fsleep(Delta::from_millis(1)); + + let level = get_raw_value(&gpiod)?; + + gpiod.direction_input()?; + dev_info!(dev, "line is input mode\n"); + pr_status()?; + + fsleep(Delta::from_millis(1)); + + gpiod.direction_output_raw(!level)?; + dev_info!(dev, "line is toggled\n"); + pr_status()?; + + fsleep(Delta::from_millis(1)); + + set_raw_value(&gpiod, !!level)?; + dev_info!(dev, "line is toggled\n"); + pr_status()?; + + Ok(()) + } +} + +kernel::of_device_table!( + OF_TABLE, + MODULE_OF_TABLE, + ::IdInfo, + [(of::DeviceId::new(c"test,rust-gpio-consumer"), ())] +); + +kernel::module_platform_driver! { + type: SampleDriver, + name: "rust_gpio_consumer", + authors: ["Kohei Ito"], + description: "Rust GPIO consumer driver", + license: "GPL v2", +} -- 2.50.1