[PATCH 3/3] iio: core: move debugfs data on the private iio dev info

[Alexandru Ardelean]

This change moves all iio_dev debugfs fields to the iio_dev_priv object.
It's not the biggest advantage yet (to the whole thing of abstractization)
but it's a start.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
---
 drivers/iio/iio_core.h          | 10 +++++++++
 drivers/iio/industrialio-core.c | 40 ++++++++++++++++++++++-----------
 include/linux/iio/iio.h         | 13 +----------
 3 files changed, 38 insertions(+), 25 deletions(-)

diff --git a/drivers/iio/iio_core.h b/drivers/iio/iio_core.h
index 84f3b4590c05..bc9f580d2bdd 100644
--- a/drivers/iio/iio_core.h
+++ b/drivers/iio/iio_core.h
@@ -20,9 +20,19 @@ extern struct device_type iio_device_type;
 /**
  * struct iio_dev_priv - industrial I/O device private information
  * @indio_dev:			public IIO device object
+ * @debugfs_dentry:		device specific debugfs dentry
+ * @cached_reg_addr:		cached register address for debugfs reads
+ * @read_buf:			read buffer to be used for the initial reg read
+ * @read_buf_len:		data length in @read_buf
  */
 struct iio_dev_priv {
 	struct iio_dev			indio_dev;
+#if defined(CONFIG_DEBUG_FS)
+	struct dentry			*debugfs_dentry;
+	unsigned			cached_reg_addr;
+	char				read_buf[20];
+	unsigned int			read_buf_len;
+#endif
 };
 
 #define to_iio_dev_priv(indio_dev)	\
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index b924197b5984..091ae79de751 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -181,6 +181,13 @@ struct iio_dev *iio_priv_to_dev(void *priv)
 }
 EXPORT_SYMBOL_GPL(iio_priv_to_dev);
 
+struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
+{
+	struct iio_dev_priv *iio_dev_priv = to_iio_dev_priv(indio_dev);
+	return iio_dev_priv->debugfs_dentry;
+}
+EXPORT_SYMBOL_GPL(iio_get_debugfs_dentry);
+
 /**
  * iio_find_channel_from_si() - get channel from its scan index
  * @indio_dev:		device
@@ -324,35 +331,37 @@ static ssize_t iio_debugfs_read_reg(struct file *file, char __user *userbuf,
 			      size_t count, loff_t *ppos)
 {
 	struct iio_dev *indio_dev = file->private_data;
+	struct iio_dev_priv *iio_dev_priv = to_iio_dev_priv(indio_dev);
 	unsigned val = 0;
 	int ret;
 
 	if (*ppos > 0)
 		return simple_read_from_buffer(userbuf, count, ppos,
-					       indio_dev->read_buf,
-					       indio_dev->read_buf_len);
+					       iio_dev_priv->read_buf,
+					       iio_dev_priv->read_buf_len);
 
 	ret = indio_dev->info->debugfs_reg_access(indio_dev,
-						  indio_dev->cached_reg_addr,
+						  iio_dev_priv->cached_reg_addr,
 						  0, &val);
 	if (ret) {
 		dev_err(indio_dev->dev.parent, "%s: read failed\n", __func__);
 		return ret;
 	}
 
-	indio_dev->read_buf_len = snprintf(indio_dev->read_buf,
-					   sizeof(indio_dev->read_buf),
-					   "0x%X\n", val);
+	iio_dev_priv->read_buf_len = snprintf(iio_dev_priv->read_buf,
+					      sizeof(iio_dev_priv->read_buf),
+					      "0x%X\n", val);
 
 	return simple_read_from_buffer(userbuf, count, ppos,
-				       indio_dev->read_buf,
-				       indio_dev->read_buf_len);
+				       iio_dev_priv->read_buf,
+				       iio_dev_priv->read_buf_len);
 }
 
 static ssize_t iio_debugfs_write_reg(struct file *file,
 		     const char __user *userbuf, size_t count, loff_t *ppos)
 {
 	struct iio_dev *indio_dev = file->private_data;
+	struct iio_dev_priv *iio_dev_priv = to_iio_dev_priv(indio_dev);
 	unsigned reg, val;
 	char buf[80];
 	int ret;
@@ -367,10 +376,10 @@ static ssize_t iio_debugfs_write_reg(struct file *file,
 
 	switch (ret) {
 	case 1:
-		indio_dev->cached_reg_addr = reg;
+		iio_dev_priv->cached_reg_addr = reg;
 		break;
 	case 2:
-		indio_dev->cached_reg_addr = reg;
+		iio_dev_priv->cached_reg_addr = reg;
 		ret = indio_dev->info->debugfs_reg_access(indio_dev, reg,
 							  val, NULL);
 		if (ret) {
@@ -394,23 +403,28 @@ static const struct file_operations iio_debugfs_reg_fops = {
 
 static void iio_device_unregister_debugfs(struct iio_dev *indio_dev)
 {
-	debugfs_remove_recursive(indio_dev->debugfs_dentry);
+	struct iio_dev_priv *iio_dev_priv = to_iio_dev_priv(indio_dev);
+	debugfs_remove_recursive(iio_dev_priv->debugfs_dentry);
 }
 
 static void iio_device_register_debugfs(struct iio_dev *indio_dev)
 {
+	struct iio_dev_priv *iio_dev_priv;
+
 	if (indio_dev->info->debugfs_reg_access == NULL)
 		return;
 
 	if (!iio_debugfs_dentry)
 		return;
 
-	indio_dev->debugfs_dentry =
+	iio_dev_priv = to_iio_dev_priv(indio_dev);
+
+	iio_dev_priv->debugfs_dentry =
 		debugfs_create_dir(dev_name(&indio_dev->dev),
 				   iio_debugfs_dentry);
 
 	debugfs_create_file("direct_reg_access", 0644,
-			    indio_dev->debugfs_dentry, indio_dev,
+			    iio_dev_priv->debugfs_dentry, indio_dev,
 			    &iio_debugfs_reg_fops);
 }
 #else
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 38c4ea505394..6155e7aec60c 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -520,8 +520,6 @@ struct iio_buffer_setup_ops {
  * @groups:		[INTERN] attribute groups
  * @groupcounter:	[INTERN] index of next attribute group
  * @flags:		[INTERN] file ops related flags including busy flag.
- * @debugfs_dentry:	[INTERN] device specific debugfs dentry.
- * @cached_reg_addr:	[INTERN] cached register address for debugfs reads.
  */
 struct iio_dev {
 	int				id;
@@ -565,12 +563,6 @@ struct iio_dev {
 	int				groupcounter;
 
 	unsigned long			flags;
-#if defined(CONFIG_DEBUG_FS)
-	struct dentry			*debugfs_dentry;
-	unsigned			cached_reg_addr;
-	char				read_buf[20];
-	unsigned int			read_buf_len;
-#endif
 };
 
 const struct iio_chan_spec
@@ -701,10 +693,7 @@ static inline bool iio_buffer_enabled(struct iio_dev *indio_dev)
  * @indio_dev:		IIO device structure for device
  **/
 #if defined(CONFIG_DEBUG_FS)
-static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
-{
-	return indio_dev->debugfs_dentry;
-}
+struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev);
 #else
 static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
 {
-- 
2.17.1