Add cs42l43 PC focused SoundWire CODEC

Merge series from Charles Keepax <ckeepax@opensource.cirrus.com>:

This patch chain adds support for the Cirrus Logic cs42l43 PC focused
SoundWire CODEC. The chain is currently based of Lee's for-mfd-next
branch.

This series is mostly just a resend keeping pace with the kernel under
it, except for a minor fixup in the ASoC stuff.

Thanks,
Charles

Charles Keepax (4):
  dt-bindings: mfd: cirrus,cs42l43: Add initial DT binding
  mfd: cs42l43: Add support for cs42l43 core driver
  pinctrl: cs42l43: Add support for the cs42l43
  ASoC: cs42l43: Add support for the cs42l43

Lucas Tanure (2):
  soundwire: bus: Allow SoundWire peripherals to register IRQ handlers
  spi: cs42l43: Add SPI controller support

 .../bindings/sound/cirrus,cs42l43.yaml        |  313 +++
 MAINTAINERS                                   |    4 +
 drivers/mfd/Kconfig                           |   23 +
 drivers/mfd/Makefile                          |    3 +
 drivers/mfd/cs42l43-i2c.c                     |   98 +
 drivers/mfd/cs42l43-sdw.c                     |  239 ++
 drivers/mfd/cs42l43.c                         | 1188 +++++++++
 drivers/mfd/cs42l43.h                         |   28 +
 drivers/pinctrl/cirrus/Kconfig                |   11 +
 drivers/pinctrl/cirrus/Makefile               |    2 +
 drivers/pinctrl/cirrus/pinctrl-cs42l43.c      |  609 +++++
 drivers/soundwire/bus.c                       |   32 +
 drivers/soundwire/bus_type.c                  |   12 +
 drivers/spi/Kconfig                           |    7 +
 drivers/spi/Makefile                          |    1 +
 drivers/spi/spi-cs42l43.c                     |  284 ++
 include/linux/mfd/cs42l43-regs.h              | 1184 +++++++++
 include/linux/mfd/cs42l43.h                   |  102 +
 include/linux/soundwire/sdw.h                 |    9 +
 include/sound/cs42l43.h                       |   17 +
 sound/soc/codecs/Kconfig                      |   16 +
 sound/soc/codecs/Makefile                     |    4 +
 sound/soc/codecs/cs42l43-jack.c               |  946 +++++++
 sound/soc/codecs/cs42l43-sdw.c                |   74 +
 sound/soc/codecs/cs42l43.c                    | 2278 +++++++++++++++++
 sound/soc/codecs/cs42l43.h                    |  131 +
 26 files changed, 7615 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/cirrus,cs42l43.yaml
 create mode 100644 drivers/mfd/cs42l43-i2c.c
 create mode 100644 drivers/mfd/cs42l43-sdw.c
 create mode 100644 drivers/mfd/cs42l43.c
 create mode 100644 drivers/mfd/cs42l43.h
 create mode 100644 drivers/pinctrl/cirrus/pinctrl-cs42l43.c
 create mode 100644 drivers/spi/spi-cs42l43.c
 create mode 100644 include/linux/mfd/cs42l43-regs.h
 create mode 100644 include/linux/mfd/cs42l43.h
 create mode 100644 include/sound/cs42l43.h
 create mode 100644 sound/soc/codecs/cs42l43-jack.c
 create mode 100644 sound/soc/codecs/cs42l43-sdw.c
 create mode 100644 sound/soc/codecs/cs42l43.c
 create mode 100644 sound/soc/codecs/cs42l43.h

--
2.30.2

1 files changed, 59 insertions, 15 deletions

diff --git a/rust/kernel/allocator.rs b/rust/kernel/allocator.rs
index 397a3dd57a9b..9363b527be66 100644
--- a/rust/kernel/allocator.rs
+++ b/rust/kernel/allocator.rs
@@ -9,6 +9,36 @@ use crate::bindings;
 
 struct KernelAllocator;
 
+/// Calls `krealloc` with a proper size to alloc a new object aligned to `new_layout`'s alignment.
+///
+/// # Safety
+///
+/// - `ptr` can be either null or a pointer which has been allocated by this allocator.
+/// - `new_layout` must have a non-zero size.
+unsafe fn krealloc_aligned(ptr: *mut u8, new_layout: Layout, flags: bindings::gfp_t) -> *mut u8 {
+    // Customized layouts from `Layout::from_size_align()` can have size < align, so pad first.
+    let layout = new_layout.pad_to_align();
+
+    let mut size = layout.size();
+
+    if layout.align() > bindings::BINDINGS_ARCH_SLAB_MINALIGN {
+        // The alignment requirement exceeds the slab guarantee, thus try to enlarge the size
+        // to use the "power-of-two" size/alignment guarantee (see comments in `kmalloc()` for
+        // more information).
+        //
+        // Note that `layout.size()` (after padding) is guaranteed to be a multiple of
+        // `layout.align()`, so `next_power_of_two` gives enough alignment guarantee.
+        size = size.next_power_of_two();
+    }
+
+    // SAFETY:
+    // - `ptr` is either null or a pointer returned from a previous `k{re}alloc()` by the
+    //   function safety requirement.
+    // - `size` is greater than 0 since it's either a `layout.size()` (which cannot be zero
+    //    according to the function safety requirement) or a result from `next_power_of_two()`.
+    unsafe { bindings::krealloc(ptr as *const core::ffi::c_void, size, flags) as *mut u8 }
+}
+
 unsafe impl GlobalAlloc for KernelAllocator {
     unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
         // `krealloc()` is used instead of `kmalloc()` because the latter is
@@ -30,10 +60,20 @@ static ALLOCATOR: KernelAllocator = KernelAllocator;
 // to extract the object file that has them from the archive. For the moment,
 // let's generate them ourselves instead.
 //
+// Note: Although these are *safe* functions, they are called by the compiler
+// with parameters that obey the same `GlobalAlloc` function safety
+// requirements: size and align should form a valid layout, and size is
+// greater than 0.
+//
 // Note that `#[no_mangle]` implies exported too, nowadays.
 #[no_mangle]
-fn __rust_alloc(size: usize, _align: usize) -> *mut u8 {
-    unsafe { bindings::krealloc(core::ptr::null(), size, bindings::GFP_KERNEL) as *mut u8 }
+fn __rust_alloc(size: usize, align: usize) -> *mut u8 {
+    // SAFETY: See assumption above.
+    let layout = unsafe { Layout::from_size_align_unchecked(size, align) };
+
+    // SAFETY: `ptr::null_mut()` is null, per assumption above the size of `layout` is greater
+    // than 0.
+    unsafe { krealloc_aligned(ptr::null_mut(), layout, bindings::GFP_KERNEL) }
 }
 
 #[no_mangle]
@@ -42,23 +82,27 @@ fn __rust_dealloc(ptr: *mut u8, _size: usize, _align: usize) {
 }
 
 #[no_mangle]
-fn __rust_realloc(ptr: *mut u8, _old_size: usize, _align: usize, new_size: usize) -> *mut u8 {
-    unsafe {
-        bindings::krealloc(
-            ptr as *const core::ffi::c_void,
-            new_size,
-            bindings::GFP_KERNEL,
-        ) as *mut u8
-    }
+fn __rust_realloc(ptr: *mut u8, _old_size: usize, align: usize, new_size: usize) -> *mut u8 {
+    // SAFETY: See assumption above.
+    let new_layout = unsafe { Layout::from_size_align_unchecked(new_size, align) };
+
+    // SAFETY: Per assumption above, `ptr` is allocated by `__rust_*` before, and the size of
+    // `new_layout` is greater than 0.
+    unsafe { krealloc_aligned(ptr, new_layout, bindings::GFP_KERNEL) }
 }
 
 #[no_mangle]
-fn __rust_alloc_zeroed(size: usize, _align: usize) -> *mut u8 {
+fn __rust_alloc_zeroed(size: usize, align: usize) -> *mut u8 {
+    // SAFETY: See assumption above.
+    let layout = unsafe { Layout::from_size_align_unchecked(size, align) };
+
+    // SAFETY: `ptr::null_mut()` is null, per assumption above the size of `layout` is greater
+    // than 0.
     unsafe {
-        bindings::krealloc(
-            core::ptr::null(),
-            size,
+        krealloc_aligned(
+            ptr::null_mut(),
+            layout,
             bindings::GFP_KERNEL | bindings::__GFP_ZERO,
-        ) as *mut u8
+        )
     }
 }