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, 52 insertions, 16 deletions

diff --git a/fs/readdir.c b/fs/readdir.c
index b264ce60114d..c8c46e294431 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -25,6 +25,53 @@
 #include <asm/unaligned.h>
 
 /*
+ * Some filesystems were never converted to '->iterate_shared()'
+ * and their directory iterators want the inode lock held for
+ * writing. This wrapper allows for converting from the shared
+ * semantics to the exclusive inode use.
+ */
+int wrap_directory_iterator(struct file *file,
+			    struct dir_context *ctx,
+			    int (*iter)(struct file *, struct dir_context *))
+{
+	struct inode *inode = file_inode(file);
+	int ret;
+
+	/*
+	 * We'd love to have an 'inode_upgrade_trylock()' operation,
+	 * see the comment in mmap_upgrade_trylock() in mm/memory.c.
+	 *
+	 * But considering this is for "filesystems that never got
+	 * converted", it really doesn't matter.
+	 *
+	 * Also note that since we have to return with the lock held
+	 * for reading, we can't use the "killable()" locking here,
+	 * since we do need to get the lock even if we're dying.
+	 *
+	 * We could do the write part killably and then get the read
+	 * lock unconditionally if it mattered, but see above on why
+	 * this does the very simplistic conversion.
+	 */
+	up_read(&inode->i_rwsem);
+	down_write(&inode->i_rwsem);
+
+	/*
+	 * Since we dropped the inode lock, we should do the
+	 * DEADDIR test again. See 'iterate_dir()' below.
+	 *
+	 * Note that we don't need to re-do the f_pos games,
+	 * since the file must be locked wrt f_pos anyway.
+	 */
+	ret = -ENOENT;
+	if (!IS_DEADDIR(inode))
+		ret = iter(file, ctx);
+
+	downgrade_write(&inode->i_rwsem);
+	return ret;
+}
+EXPORT_SYMBOL(wrap_directory_iterator);
+
+/*
  * Note the "unsafe_put_user() semantics: we goto a
  * label for errors.
  */
@@ -40,39 +87,28 @@
 int iterate_dir(struct file *file, struct dir_context *ctx)
 {
 	struct inode *inode = file_inode(file);
-	bool shared = false;
 	int res = -ENOTDIR;
-	if (file->f_op->iterate_shared)
-		shared = true;
-	else if (!file->f_op->iterate)
+
+	if (!file->f_op->iterate_shared)
 		goto out;
 
 	res = security_file_permission(file, MAY_READ);
 	if (res)
 		goto out;
 
-	if (shared)
-		res = down_read_killable(&inode->i_rwsem);
-	else
-		res = down_write_killable(&inode->i_rwsem);
+	res = down_read_killable(&inode->i_rwsem);
 	if (res)
 		goto out;
 
 	res = -ENOENT;
 	if (!IS_DEADDIR(inode)) {
 		ctx->pos = file->f_pos;
-		if (shared)
-			res = file->f_op->iterate_shared(file, ctx);
-		else
-			res = file->f_op->iterate(file, ctx);
+		res = file->f_op->iterate_shared(file, ctx);
 		file->f_pos = ctx->pos;
 		fsnotify_access(file);
 		file_accessed(file);
 	}
-	if (shared)
-		inode_unlock_shared(inode);
-	else
-		inode_unlock(inode);
+	inode_unlock_shared(inode);
 out:
 	return res;
 }