iio: proximity: isl29501: Fix return type of isl29501_register_writegrafted

isl29501_register_write() was returning a u32 instead of an int.
Since the function returns negative error codes (such as -ERANGE or
return values from i2c_smbus_write_byte_data()), returning an unsigned
integer type prevents callers from correctly checking for negative error
conditions.

Fix this by changing the function return type from u32 to int.

This was found through manual code review.

Fixes: 1c28799257bc ("iio: light: isl29501: Add support for the ISL29501 ToF sensor.")
Signed-off-by: Salah Triki <salah.triki@gmail.com>
Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/drivers/android/binder/trace.rs b/drivers/android/binder/trace.rs
new file mode 100644
index 000000000..06aabb3cc
--- /dev/null
+++ b/drivers/android/binder/trace.rs
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+
+// Copyright (C) 2025 Google LLC.
+
+use crate::transaction::Transaction;
+
+use core::ptr;
+
+use kernel::bindings::{rust_binder_transaction, task_struct};
+use kernel::error::Result;
+use kernel::ffi::{c_int, c_uint, c_ulong};
+use kernel::task::Task;
+use kernel::tracepoint::declare_trace;
+
+declare_trace! {
+    unsafe fn binder_ioctl(cmd: c_uint, arg: c_ulong);
+    unsafe fn binder_ioctl_done(ret: c_int);
+    unsafe fn binder_read_done(ret: c_int);
+    unsafe fn binder_write_done(ret: c_int);
+    unsafe fn binder_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool);
+    unsafe fn binder_transaction(reply: bool, t: rust_binder_transaction, thread: *mut task_struct);
+    unsafe fn binder_transaction_received(t: rust_binder_transaction);
+    unsafe fn binder_transaction_fd_send(t_debug_id: c_int, fd: c_int, offset: usize);
+    unsafe fn binder_transaction_fd_recv(t_debug_id: c_int, fd: c_int, offset: usize);
+    unsafe fn binder_command(cmd: u32);
+    unsafe fn binder_return(ret: u32);
+}
+
+#[inline]
+fn raw_transaction(t: &Transaction) -> rust_binder_transaction {
+    ptr::from_ref(t).cast_mut().cast()
+}
+
+#[inline]
+fn to_errno(ret: Result) -> i32 {
+    match ret {
+        Ok(()) => 0,
+        Err(err) => err.to_errno(),
+    }
+}
+
+#[inline]
+pub(crate) fn trace_ioctl(cmd: u32, arg: usize) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_ioctl(cmd, arg as c_ulong) }
+}
+
+#[inline]
+pub(crate) fn trace_ioctl_done(ret: Result) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_ioctl_done(to_errno(ret)) }
+}
+#[inline]
+pub(crate) fn trace_read_done(ret: Result) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_read_done(to_errno(ret)) }
+}
+#[inline]
+pub(crate) fn trace_write_done(ret: Result) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_write_done(to_errno(ret)) }
+}
+
+#[inline]
+pub(crate) fn trace_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_wait_for_work(proc_work, transaction_stack, thread_todo) }
+}
+
+#[inline]
+pub(crate) fn trace_transaction(reply: bool, t: &Transaction, thread: Option<&Task>) {
+    let thread = match thread {
+        Some(thread) => thread.as_ptr(),
+        None => core::ptr::null_mut(),
+    };
+    // SAFETY: The raw transaction is valid for the duration of this call. The thread pointer is
+    // valid or null.
+    unsafe { binder_transaction(reply, raw_transaction(t), thread) }
+}
+
+#[inline]
+pub(crate) fn trace_transaction_received(t: &Transaction) {
+    // SAFETY: The raw transaction is valid for the duration of this call.
+    unsafe { binder_transaction_received(raw_transaction(t)) }
+}
+
+#[inline]
+pub(crate) fn trace_transaction_fd_send(t_debug_id: usize, fd: u32, offset: usize) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_transaction_fd_send(t_debug_id as c_int, fd as c_int, offset) }
+}
+#[inline]
+pub(crate) fn trace_transaction_fd_recv(t_debug_id: usize, fd: u32, offset: usize) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_transaction_fd_recv(t_debug_id as c_int, fd as c_int, offset) }
+}
+
+#[inline]
+pub(crate) fn trace_command(cmd: u32) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_command(cmd) }
+}
+#[inline]
+pub(crate) fn trace_return(ret: u32) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_return(ret) }
+}