diff options
| author | Francisco Jerez <currojerez@riseup.net> | 2010-07-19 15:55:08 +0200 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2010-07-26 11:42:30 +1000 |
| commit | 6d416d80f720f71e2dfe903d672bcca071822538 (patch) | |
| tree | 9b5739051504e8b1674d797c045daffcfc3b6b2a /drivers/gpu/drm/nouveau/nouveau_i2c.c | |
| parent | 6d6a413aa23c8bc7a5787596e06f3d6d8d4f11c7 (diff) | |
drm/nouveau: Add some generic I2C gadget detection code.
Clean up and move the external TV encoder detection code to
nouveau_i2c.c, it's also going to be useful for external TMDS and DDC
detection.
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_i2c.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_i2c.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_i2c.c b/drivers/gpu/drm/nouveau/nouveau_i2c.c index 316a3c7e6eb4..97ba89ef42a0 100644 --- a/drivers/gpu/drm/nouveau/nouveau_i2c.c +++ b/drivers/gpu/drm/nouveau/nouveau_i2c.c @@ -278,3 +278,37 @@ nouveau_i2c_find(struct drm_device *dev, int index) return i2c->chan; } +bool +nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr) +{ + struct i2c_msg msg = { + .addr = addr, + .len = 0, + }; + + return i2c_transfer(&i2c->adapter, &msg, 1) == 1; +} + +int +nouveau_i2c_identify(struct drm_device *dev, const char *what, + struct i2c_board_info *info, int index) +{ + struct nouveau_i2c_chan *i2c = nouveau_i2c_find(dev, index); + int was_locked, i; + + was_locked = NVLockVgaCrtcs(dev, false); + NV_DEBUG(dev, "Probing %ss on I2C bus: %d\n", what, index); + + for (i = 0; info[i].addr; i++) { + if (nouveau_probe_i2c_addr(i2c, info[i].addr)) { + NV_INFO(dev, "Detected %s: %s\n", what, info[i].type); + goto out; + } + } + + NV_DEBUG(dev, "No devices found.\n"); +out: + NVLockVgaCrtcs(dev, was_locked); + + return info[i].addr ? i : -ENODEV; +} |