drm/radeon/kms: unify i2c handling

Previously we added i2c buses as needed when enumerating connectors
power management, etc.  This only exposed the actual buses used and
could have lead to the same buse getting created more than once if
one buses was used for more than one purpose.  This patch sets up
all i2c buses on the card in one place and users of the buses just
point back to the one instance.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index 71aea4037e90..02d4e2af6180 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -82,6 +82,8 @@ enum radeon_hpd_id {
         RADEON_HPD_NONE = 0xff,
 };
 
+#define RADEON_MAX_I2C_BUS 16
+
 /* radeon gpio-based i2c
  * 1. "mask" reg and bits
  *    grabs the gpio pins for software use
@@ -445,6 +447,15 @@ extern void atombios_dig_transmitter_setup(struct drm_encoder *encoder,
 extern int radeon_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
                                 uint8_t write_byte, uint8_t *read_byte);
 
+extern void radeon_i2c_init(struct radeon_device *rdev);
+extern void radeon_i2c_fini(struct radeon_device *rdev);
+extern void radeon_combios_i2c_init(struct radeon_device *rdev);
+extern void radeon_atombios_i2c_init(struct radeon_device *rdev);
+extern void radeon_i2c_add(struct radeon_device *rdev,
+                           struct radeon_i2c_bus_rec *rec,
+                           const char *name);
+extern struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
+                                                 struct radeon_i2c_bus_rec *i2c_bus);
 extern struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
                                                     struct radeon_i2c_bus_rec *rec,
                                                     const char *name);