diff options
author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2013-08-28 10:28:26 -0300 |
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committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-10-31 04:31:30 -0200 |
commit | cf326dfebe612bf56c83d8fca7a7c1d1584c061f (patch) | |
tree | 0147f77a00da075c875c44b835b7eeb5502b5460 /drivers/media/v4l2-core | |
parent | d3f884a70938b1776ba44c7b6c82f3c3fd54ccbd (diff) |
[media] V4L2: add v4l2-clock helpers to register and unregister a fixed-rate clock
Many bridges and video host controllers supply fixed rate always on clocks
to their I2C devices. This patch adds two simple helpers to register and
unregister such a clock.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/v4l2-core')
-rw-r--r-- | drivers/media/v4l2-core/v4l2-clk.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-clk.c b/drivers/media/v4l2-core/v4l2-clk.c index b67de8642b5a..e18cc0469cf8 100644 --- a/drivers/media/v4l2-core/v4l2-clk.c +++ b/drivers/media/v4l2-core/v4l2-clk.c @@ -240,3 +240,42 @@ void v4l2_clk_unregister(struct v4l2_clk *clk) kfree(clk); } EXPORT_SYMBOL(v4l2_clk_unregister); + +struct v4l2_clk_fixed { + unsigned long rate; + struct v4l2_clk_ops ops; +}; + +static unsigned long fixed_get_rate(struct v4l2_clk *clk) +{ + struct v4l2_clk_fixed *priv = clk->priv; + return priv->rate; +} + +struct v4l2_clk *__v4l2_clk_register_fixed(const char *dev_id, + const char *id, unsigned long rate, struct module *owner) +{ + struct v4l2_clk *clk; + struct v4l2_clk_fixed *priv = kzalloc(sizeof(*priv), GFP_KERNEL); + + if (!priv) + return ERR_PTR(-ENOMEM); + + priv->rate = rate; + priv->ops.get_rate = fixed_get_rate; + priv->ops.owner = owner; + + clk = v4l2_clk_register(&priv->ops, dev_id, id, priv); + if (IS_ERR(clk)) + kfree(priv); + + return clk; +} +EXPORT_SYMBOL(__v4l2_clk_register_fixed); + +void v4l2_clk_unregister_fixed(struct v4l2_clk *clk) +{ + kfree(clk->priv); + v4l2_clk_unregister(clk); +} +EXPORT_SYMBOL(v4l2_clk_unregister_fixed); |