V4L/DVB: v4l2_subdev: Add s_io_pin_config to v4l2_subdev_core_ops

Add a method to v4l2_sudev_core_ops to allow bridge drivers to
manage what signal pads/functions are routed out to multiplexed IO pins on a
pin by pin basis.  The interface also allows specifying initial output settings
for pins and disabling an IO pin altogether.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 02c6f4d11ed3..9195ad490ee2 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -90,10 +90,31 @@ struct v4l2_decode_vbi_line {
    not yet implemented) since ops provide proper type-checking.
  */
 
+/* Subdevice external IO pin configuration */
+#define V4L2_SUBDEV_IO_PIN_DISABLE      (1 << 0) /* ENABLE assumed */
+#define V4L2_SUBDEV_IO_PIN_OUTPUT       (1 << 1)
+#define V4L2_SUBDEV_IO_PIN_INPUT        (1 << 2)
+#define V4L2_SUBDEV_IO_PIN_SET_VALUE    (1 << 3) /* Set output value */
+#define V4L2_SUBDEV_IO_PIN_ACTIVE_LOW   (1 << 4) /* ACTIVE HIGH assumed */
+
+struct v4l2_subdev_io_pin_config {
+        u32 flags;      /* V4L2_SUBDEV_IO_PIN_* flags for this pin's config */
+        u8 pin;         /* Chip external IO pin to configure */
+        u8 function;    /* Internal signal pad/function to route to IO pin */
+        u8 value;       /* Initial value for pin - e.g. GPIO output value */
+        u8 strength;    /* Pin drive strength */
+};
+
 /* s_config: if set, then it is always called by the v4l2_i2c_new_subdev*
         functions after the v4l2_subdev was registered. It is used to pass
         platform data to the subdev which can be used during initialization.
 
+   s_io_pin_config: configure one or more chip I/O pins for chips that
+        multiplex different internal signal pads out to IO pins.  This function
+        takes a pointer to an array of 'n' pin configuration entries, one for
+        each pin being configured.  This function could be called at times
+        other than just subdevice initialization.
+
    init: initialize the sensor registors to some sort of reasonable default
         values. Do not use for new drivers and should be removed in existing
         drivers.
@@ -115,6 +136,8 @@ struct v4l2_subdev_core_ops {
         int (*g_chip_ident)(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip);
         int (*log_status)(struct v4l2_subdev *sd);
         int (*s_config)(struct v4l2_subdev *sd, int irq, void *platform_data);
+        int (*s_io_pin_config)(struct v4l2_subdev *sd, size_t n,
+                                      struct v4l2_subdev_io_pin_config *pincfg);
         int (*init)(struct v4l2_subdev *sd, u32 val);
         int (*load_fw)(struct v4l2_subdev *sd);
         int (*reset)(struct v4l2_subdev *sd, u32 val);