From 8b2ff3204909687be26f20d63dcddc8e3d7a6c14 Mon Sep 17 00:00:00 2001 From: Srinivas Kandagatla Date: Mon, 22 Jul 2013 04:22:57 -0300 Subject: [PATCH] [media] media: rc: Add rc_open/close and use count to rc_dev This patch adds user count to rc_dev structure, the reason to add this new member is to allow other code like lirc to open rc device directly. In the existing code, rc device is only opened by input subsystem which works ok if we have any input drivers to match. But in case like lirc where there will be no input driver, rc device will be never opened. Having this user count variable will be usefull to allow rc device to be opened from code other than rc-main. This patch also adds rc_open and rc_close functions for other drivers like lirc to open and close rc devices. This functions safely increment and decrement the user count. Other driver wanting to open rc device should call rc_open and rc_close, rather than directly modifying the rc_dev structure. Signed-off-by: Srinivas Kandagatla Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/rc-main.c | 46 ++++++++++++++++++++++++++++++++++---- include/media/rc-core.h | 4 ++++ 2 files changed, 46 insertions(+), 4 deletions(-) diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c index 1cf382a0b277..1dedebda1cef 100644 --- a/drivers/media/rc/rc-main.c +++ b/drivers/media/rc/rc-main.c @@ -699,19 +699,50 @@ void rc_keydown_notimeout(struct rc_dev *dev, int scancode, u8 toggle) } EXPORT_SYMBOL_GPL(rc_keydown_notimeout); +int rc_open(struct rc_dev *rdev) +{ + int rval = 0; + + if (!rdev) + return -EINVAL; + + mutex_lock(&rdev->lock); + if (!rdev->users++) + rval = rdev->open(rdev); + + if (rval) + rdev->users--; + + mutex_unlock(&rdev->lock); + + return rval; +} +EXPORT_SYMBOL_GPL(rc_open); + static int ir_open(struct input_dev *idev) { struct rc_dev *rdev = input_get_drvdata(idev); - return rdev->open(rdev); + return rc_open(rdev); +} + +void rc_close(struct rc_dev *rdev) +{ + if (rdev) { + mutex_lock(&rdev->lock); + + if (!--rdev->users) + rdev->close(rdev); + + mutex_unlock(&rdev->lock); + } } +EXPORT_SYMBOL_GPL(rc_close); static void ir_close(struct input_dev *idev) { struct rc_dev *rdev = input_get_drvdata(idev); - - if (rdev) - rdev->close(rdev); + rc_close(rdev); } /* class for /sys/class/rc */ @@ -1076,7 +1107,14 @@ int rc_register_device(struct rc_dev *dev) memcpy(&dev->input_dev->id, &dev->input_id, sizeof(dev->input_id)); dev->input_dev->phys = dev->input_phys; dev->input_dev->name = dev->input_name; + + /* input_register_device can call ir_open, so unlock mutex here */ + mutex_unlock(&dev->lock); + rc = input_register_device(dev->input_dev); + + mutex_lock(&dev->lock); + if (rc) goto out_table; diff --git a/include/media/rc-core.h b/include/media/rc-core.h index 06a75deff553..2f6f1f78d958 100644 --- a/include/media/rc-core.h +++ b/include/media/rc-core.h @@ -101,6 +101,7 @@ struct rc_dev { bool idle; u64 allowed_protos; u64 enabled_protocols; + u32 users; u32 scanmask; void *priv; spinlock_t keylock; @@ -142,6 +143,9 @@ void rc_free_device(struct rc_dev *dev); int rc_register_device(struct rc_dev *dev); void rc_unregister_device(struct rc_dev *dev); +int rc_open(struct rc_dev *rdev); +void rc_close(struct rc_dev *rdev); + void rc_repeat(struct rc_dev *dev); void rc_keydown(struct rc_dev *dev, int scancode, u8 toggle); void rc_keydown_notimeout(struct rc_dev *dev, int scancode, u8 toggle); -- 2.30.2