From patchwork Tue Apr 11 11:12:43 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 97239 Delivered-To: patch@linaro.org Received: by 10.140.89.233 with SMTP id v96csp1756177qgd; Tue, 11 Apr 2017 04:13:03 -0700 (PDT) X-Received: by 10.99.97.147 with SMTP id v141mr61829282pgb.98.1491909183227; Tue, 11 Apr 2017 04:13:03 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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This patch allows users to safely call these functions when !CONFIG_RC_CORE and make decisions based on the return value instead. This is a much more common and clean way of doing things within the Linux kernel. Signed-off-by: Lee Jones --- include/media/rc-core.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) -- 2.9.3 diff --git a/include/media/rc-core.h b/include/media/rc-core.h index 73ddd721..45ba739 100644 --- a/include/media/rc-core.h +++ b/include/media/rc-core.h @@ -209,7 +209,14 @@ struct rc_dev { * @rc_driver_type: specifies the type of the RC output to be allocated * returns a pointer to struct rc_dev. */ +#ifdef CONFIG_RC_CORE struct rc_dev *rc_allocate_device(enum rc_driver_type); +#else +static inline struct rc_dev *rc_allocate_device(int unused) +{ + return NULL; +} +#endif /** * devm_rc_allocate_device - Managed RC device allocation @@ -218,21 +225,42 @@ struct rc_dev *rc_allocate_device(enum rc_driver_type); * @rc_driver_type: specifies the type of the RC output to be allocated * returns a pointer to struct rc_dev. */ +#ifdef CONFIG_RC_CORE struct rc_dev *devm_rc_allocate_device(struct device *dev, enum rc_driver_type); +#else +static inline struct rc_dev *devm_rc_allocate_device(struct device *dev, int unused) +{ + return NULL; +} +#endif /** * rc_free_device - Frees a RC device * * @dev: pointer to struct rc_dev. */ +#ifdef CONFIG_RC_CORE void rc_free_device(struct rc_dev *dev); +#else +static inline void rc_free_device(struct rc_dev *dev) +{ + return; +} +#endif /** * rc_register_device - Registers a RC device * * @dev: pointer to struct rc_dev. */ +#ifdef CONFIG_RC_CORE int rc_register_device(struct rc_dev *dev); +#else +static inline int rc_register_device(struct rc_dev *dev) +{ + return -EOPNOTSUPP; +} +#endif /** * devm_rc_register_device - Manageded registering of a RC device @@ -240,14 +268,28 @@ int rc_register_device(struct rc_dev *dev); * @parent: pointer to struct device. * @dev: pointer to struct rc_dev. */ +#ifdef CONFIG_RC_CORE int devm_rc_register_device(struct device *parent, struct rc_dev *dev); +#else +static inline int devm_rc_register_device(struct device *parent, struct rc_dev *dev) +{ + return -EOPNOTSUPP; +} +#endif /** * rc_unregister_device - Unregisters a RC device * * @dev: pointer to struct rc_dev. */ +#ifdef CONFIG_RC_CORE void rc_unregister_device(struct rc_dev *dev); +#else +static inline void rc_unregister_device(struct rc_dev *dev) +{ + return; +} +#endif /** * rc_open - Opens a RC device From patchwork Tue Apr 11 11:12:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 97240 Delivered-To: patch@linaro.org Received: by 10.140.89.233 with SMTP id v96csp1756354qgd; Tue, 11 Apr 2017 04:13:33 -0700 (PDT) X-Received: by 10.99.218.69 with SMTP id l5mr61677027pgj.219.1491909212995; Tue, 11 Apr 2017 04:13:32 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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If they do not we WARN() them of this and disable the capability for them. Once we know RC Core code has not been enabled, we can update the user's capabilities and use them as a term of reference for other RC-only calls. This is preferable to having ugly #ifery scattered throughout C code. Most of the functions are actually safe to call, since they sensibly check for a NULL RC pointer before they attempt to deference it. Signed-off-by: Lee Jones --- drivers/media/cec/cec-core.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) -- 2.9.3 diff --git a/drivers/media/cec/cec-core.c b/drivers/media/cec/cec-core.c index cfe414a..c859dcf 100644 --- a/drivers/media/cec/cec-core.c +++ b/drivers/media/cec/cec-core.c @@ -208,9 +208,15 @@ struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops, return ERR_PTR(-EINVAL); if (WARN_ON(!available_las || available_las > CEC_MAX_LOG_ADDRS)) return ERR_PTR(-EINVAL); + + /* If RC Core is not available, remove driver-level capability */ + if (!IS_REACHABLE(CONFIG_RC_CORE)) + caps &= ~CEC_CAP_RC; + adap = kzalloc(sizeof(*adap), GFP_KERNEL); if (!adap) return ERR_PTR(-ENOMEM); + strlcpy(adap->name, name, sizeof(adap->name)); adap->phys_addr = CEC_PHYS_ADDR_INVALID; adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0; @@ -237,7 +243,6 @@ struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops, if (!(caps & CEC_CAP_RC)) return adap; -#if IS_REACHABLE(CONFIG_RC_CORE) /* Prepare the RC input device */ adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE); if (!adap->rc) { @@ -264,9 +269,7 @@ struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops, adap->rc->priv = adap; adap->rc->map_name = RC_MAP_CEC; adap->rc->timeout = MS_TO_NS(100); -#else - adap->capabilities &= ~CEC_CAP_RC; -#endif + return adap; } EXPORT_SYMBOL_GPL(cec_allocate_adapter); @@ -285,7 +288,6 @@ int cec_register_adapter(struct cec_adapter *adap, adap->owner = parent->driver->owner; adap->devnode.dev.parent = parent; -#if IS_REACHABLE(CONFIG_RC_CORE) if (adap->capabilities & CEC_CAP_RC) { adap->rc->dev.parent = parent; res = rc_register_device(adap->rc); @@ -298,15 +300,13 @@ int cec_register_adapter(struct cec_adapter *adap, return res; } } -#endif res = cec_devnode_register(&adap->devnode, adap->owner); if (res) { -#if IS_REACHABLE(CONFIG_RC_CORE) /* Note: rc_unregister also calls rc_free */ rc_unregister_device(adap->rc); adap->rc = NULL; -#endif + return res; } @@ -337,11 +337,10 @@ void cec_unregister_adapter(struct cec_adapter *adap) if (IS_ERR_OR_NULL(adap)) return; -#if IS_REACHABLE(CONFIG_RC_CORE) /* Note: rc_unregister also calls rc_free */ rc_unregister_device(adap->rc); adap->rc = NULL; -#endif + debugfs_remove_recursive(adap->cec_dir); cec_devnode_unregister(&adap->devnode); } @@ -357,9 +356,7 @@ void cec_delete_adapter(struct cec_adapter *adap) kthread_stop(adap->kthread); if (adap->kthread_config) kthread_stop(adap->kthread_config); -#if IS_REACHABLE(CONFIG_RC_CORE) rc_free_device(adap->rc); -#endif kfree(adap); } EXPORT_SYMBOL_GPL(cec_delete_adapter);