staging: iio: core: Introduce debugfs support, add support for direct register access

[firefly-linux-kernel-4.4.55.git] / drivers / staging / iio / iio.h

diff --git a/drivers/staging/iio/iio.h b/drivers/staging/iio/iio.h
index 6aa31e52c26dc68574da1c680542a0a575f467d2..b9cd454f69e2bbea397882570856037693563f13 100644 (file)
--- a/drivers/staging/iio/iio.h
+++ b/drivers/staging/iio/iio.h
@@ -286,6 +286,9 @@ struct iio_info {
                                struct iio_trigger *trig);
        int (*update_scan_mode)(struct iio_dev *indio_dev,
                                const unsigned long *scan_mask);
+       int (*debugfs_reg_access)(struct iio_dev *indio_dev,
+                                 unsigned reg, unsigned writeval,
+                                 unsigned *readval);
 };
 
 /**
@@ -332,7 +335,9 @@ 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;
 
@@ -366,6 +371,10 @@ struct iio_dev {
        int                             groupcounter;
 
        unsigned long                   flags;
+#if defined(CONFIG_DEBUG_FS)
+       struct dentry                   *debugfs_dentry;
+       unsigned                        cached_reg_addr;
+#endif
 };
 
 /**
@@ -443,4 +452,20 @@ static inline bool iio_buffer_enabled(struct iio_dev *indio_dev)
                & (INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE);
 };
 
+/**
+ * iio_get_debugfs_dentry() - helper function to get the debugfs_dentry
+ * @indio_dev:         IIO device info 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;
+};
+#else
+static inline struct dentry *iio_get_debugfs_dentry(struct iio_dev *indio_dev)
+{
+       return NULL;
+};
+#endif
+
 #endif /* _INDUSTRIAL_IO_H_ */