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Wed, 29 Apr 2026 06:22:53 -0700 (PDT) From: Muchamad Coirul Anwar To: jic23@kernel.org, linux-iio@vger.kernel.org, rust-for-linux@vger.kernel.org, devicetree@vger.kernel.org Cc: branstj@gmail.com, lars@metafoo.de, ojeda@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, igor.korotin.linux@gmail.com, linux-kernel@vger.kernel.org, Muchamad Coirul Anwar Subject: [RFC PATCH v2 1/4] i2c: rust: add smbus_read_byte_data and smbus_read_word_data Date: Wed, 29 Apr 2026 20:22:27 +0700 Message-ID: <20260429132234.30514-2-muchamadcoirulanwar@gmail.com> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20260429132234.30514-1-muchamadcoirulanwar@gmail.com> References: <20260429132234.30514-1-muchamadcoirulanwar@gmail.com> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Signed-off-by: Muchamad Coirul Anwar --- rust/kernel/i2c.rs | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/rust/kernel/i2c.rs b/rust/kernel/i2c.rs index 7b908f0c5a58..6eaea1158fda 100644 --- a/rust/kernel/i2c.rs +++ b/rust/kernel/i2c.rs @@ -477,6 +477,30 @@ impl I2cClient { fn as_raw(&self) -> *mut bindings::i2c_client { self.0.get() } + + /// Reads a single byte from a register via SMBus. + pub fn smbus_read_byte_data(&self, reg: u8) -> Result { + // SAFETY: `self.as_raw()` is a valid pointer to a `struct i2c_client` + // by the type invariant of `I2cClient`. + let ret = unsafe { bindings::i2c_smbus_read_byte_data(self.as_raw(), reg) }; + if ret < 0 { + Err(Error::from_errno(ret)) + } else { + Ok(ret as u8) + } + } + + /// Reads a 16-bit word from a register via SMBus. + pub fn smbus_read_word_data(&self, reg: u8) -> Result { + // SAFETY: `self.as_raw()` is a valid pointer to a `struct i2c_client` + // by the type invariant of `I2cClient`. + let ret = unsafe { bindings::i2c_smbus_read_word_data(self.as_raw(), reg) }; + if ret < 0 { + Err(Error::from_errno(ret)) + } else { + Ok(ret as u16) + } + } } // SAFETY: `I2cClient` is a transparent wrapper of `struct i2c_client`. -- 2.50.0