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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /include/media/dvbdev.h
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Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ...
Diffstat (limited to 'include/media/dvbdev.h')
-rw-r--r--include/media/dvbdev.h478
1 files changed, 478 insertions, 0 deletions
diff --git a/include/media/dvbdev.h b/include/media/dvbdev.h
new file mode 100644
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--- /dev/null
+++ b/include/media/dvbdev.h
@@ -0,0 +1,478 @@
+/*
+ * dvbdev.h
+ *
+ * Copyright (C) 2000 Ralph Metzler & Marcus Metzler
+ * for convergence integrated media GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Lesser Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _DVBDEV_H_
+#define _DVBDEV_H_
+
+#include <linux/types.h>
+#include <linux/poll.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <media/media-device.h>
+
+#define DVB_MAJOR 212
+
+#if defined(CONFIG_DVB_MAX_ADAPTERS) && CONFIG_DVB_MAX_ADAPTERS > 0
+ #define DVB_MAX_ADAPTERS CONFIG_DVB_MAX_ADAPTERS
+#else
+ #define DVB_MAX_ADAPTERS 16
+#endif
+
+#define DVB_UNSET (-1)
+
+/* List of DVB device types */
+
+/**
+ * enum dvb_device_type - type of the Digital TV device
+ *
+ * @DVB_DEVICE_SEC: Digital TV standalone Common Interface (CI)
+ * @DVB_DEVICE_FRONTEND: Digital TV frontend.
+ * @DVB_DEVICE_DEMUX: Digital TV demux.
+ * @DVB_DEVICE_DVR: Digital TV digital video record (DVR).
+ * @DVB_DEVICE_CA: Digital TV Conditional Access (CA).
+ * @DVB_DEVICE_NET: Digital TV network.
+ *
+ * @DVB_DEVICE_VIDEO: Digital TV video decoder.
+ * Deprecated. Used only on av7110-av.
+ * @DVB_DEVICE_AUDIO: Digital TV audio decoder.
+ * Deprecated. Used only on av7110-av.
+ * @DVB_DEVICE_OSD: Digital TV On Screen Display (OSD).
+ * Deprecated. Used only on av7110.
+ */
+enum dvb_device_type {
+ DVB_DEVICE_SEC,
+ DVB_DEVICE_FRONTEND,
+ DVB_DEVICE_DEMUX,
+ DVB_DEVICE_DVR,
+ DVB_DEVICE_CA,
+ DVB_DEVICE_NET,
+
+ DVB_DEVICE_VIDEO,
+ DVB_DEVICE_AUDIO,
+ DVB_DEVICE_OSD,
+};
+
+#define DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr) \
+ static short adapter_nr[] = \
+ {[0 ... (DVB_MAX_ADAPTERS - 1)] = DVB_UNSET }; \
+ module_param_array(adapter_nr, short, NULL, 0444); \
+ MODULE_PARM_DESC(adapter_nr, "DVB adapter numbers")
+
+struct dvb_frontend;
+
+/**
+ * struct dvb_adapter - represents a Digital TV adapter using Linux DVB API
+ *
+ * @num: Number of the adapter
+ * @list_head: List with the DVB adapters
+ * @device_list: List with the DVB devices
+ * @name: Name of the adapter
+ * @proposed_mac: proposed MAC address for the adapter
+ * @priv: private data
+ * @device: pointer to struct device
+ * @module: pointer to struct module
+ * @mfe_shared: indicates mutually exclusive frontends.
+ * 1 = legacy exclusion behavior: blocking any open() call
+ * 2 = enhanced exclusion behavior, emulating the standard
+ * behavior of busy frontends: allowing read-only sharing
+ * and otherwise returning immediately with -EBUSY when any
+ * of the frontends is already opened with write access.
+ * @mfe_dvbdev: Frontend device in use, in the case of MFE
+ * @mfe_lock: Lock to prevent using the other frontends when MFE is
+ * used.
+ * @mdev_lock: Protect access to the mdev pointer.
+ * @mdev: pointer to struct media_device, used when the media
+ * controller is used.
+ * @conn: RF connector. Used only if the device has no separate
+ * tuner.
+ * @conn_pads: pointer to struct media_pad associated with @conn;
+ */
+struct dvb_adapter {
+ int num;
+ struct list_head list_head;
+ struct list_head device_list;
+ const char *name;
+ u8 proposed_mac [6];
+ void* priv;
+
+ struct device *device;
+
+ struct module *module;
+
+ int mfe_shared; /* indicates mutually exclusive frontends */
+ struct dvb_device *mfe_dvbdev; /* frontend device in use */
+ struct mutex mfe_lock; /* access lock for thread creation */
+
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+ struct mutex mdev_lock;
+ struct media_device *mdev;
+ struct media_entity *conn;
+ struct media_pad *conn_pads;
+#endif
+};
+
+/**
+ * struct dvb_device - represents a DVB device node
+ *
+ * @list_head: List head with all DVB devices
+ * @ref: reference counter
+ * @fops: pointer to struct file_operations
+ * @adapter: pointer to the adapter that holds this device node
+ * @type: type of the device, as defined by &enum dvb_device_type.
+ * @minor: devnode minor number. Major number is always DVB_MAJOR.
+ * @id: device ID number, inside the adapter
+ * @readers: Initialized by the caller. Each call to open() in Read Only mode
+ * decreases this counter by one.
+ * @writers: Initialized by the caller. Each call to open() in Read/Write
+ * mode decreases this counter by one.
+ * @users: Initialized by the caller. Each call to open() in any mode
+ * decreases this counter by one.
+ * @wait_queue: wait queue, used to wait for certain events inside one of
+ * the DVB API callers
+ * @kernel_ioctl: callback function used to handle ioctl calls from userspace.
+ * @name: Name to be used for the device at the Media Controller
+ * @entity: pointer to struct media_entity associated with the device node
+ * @pads: pointer to struct media_pad associated with @entity;
+ * @priv: private data
+ * @intf_devnode: Pointer to media_intf_devnode. Used by the dvbdev core to
+ * store the MC device node interface
+ * @tsout_num_entities: Number of Transport Stream output entities
+ * @tsout_entity: array with MC entities associated to each TS output node
+ * @tsout_pads: array with the source pads for each @tsout_entity
+ *
+ * This structure is used by the DVB core (frontend, CA, net, demux) in
+ * order to create the device nodes. Usually, driver should not initialize
+ * this struct diretly.
+ */
+struct dvb_device {
+ struct list_head list_head;
+ struct kref ref;
+ const struct file_operations *fops;
+ struct dvb_adapter *adapter;
+ enum dvb_device_type type;
+ int minor;
+ u32 id;
+
+ /* in theory, 'users' can vanish now,
+ but I don't want to change too much now... */
+ int readers;
+ int writers;
+ int users;
+
+ wait_queue_head_t wait_queue;
+ /* don't really need those !? -- FIXME: use video_usercopy */
+ int (*kernel_ioctl)(struct file *file, unsigned int cmd, void *arg);
+
+ /* Needed for media controller register/unregister */
+#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
+ const char *name;
+
+ /* Allocated and filled inside dvbdev.c */
+ struct media_intf_devnode *intf_devnode;
+
+ unsigned tsout_num_entities;
+ struct media_entity *entity, *tsout_entity;
+ struct media_pad *pads, *tsout_pads;
+#endif
+
+ void *priv;
+};
+
+/**
+ * dvb_device_get - Increase dvb_device reference
+ *
+ * @dvbdev: pointer to struct dvb_device
+ */
+struct dvb_device *dvb_device_get(struct dvb_device *dvbdev);
+
+/**
+ * dvb_device_put - Decrease dvb_device reference
+ *
+ * @dvbdev: pointer to struct dvb_device
+ */
+void dvb_device_put(struct dvb_device *dvbdev);
+
+/**
+ * dvb_register_adapter - Registers a new DVB adapter
+ *
+ * @adap: pointer to struct dvb_adapter
+ * @name: Adapter's name
+ * @module: initialized with THIS_MODULE at the caller
+ * @device: pointer to struct device that corresponds to the device driver
+ * @adapter_nums: Array with a list of the numbers for @dvb_register_adapter;
+ * to select among them. Typically, initialized with:
+ * DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nums)
+ */
+int dvb_register_adapter(struct dvb_adapter *adap, const char *name,
+ struct module *module, struct device *device,
+ short *adapter_nums);
+
+/**
+ * dvb_unregister_adapter - Unregisters a DVB adapter
+ *
+ * @adap: pointer to struct dvb_adapter
+ */
+int dvb_unregister_adapter(struct dvb_adapter *adap);
+
+/**
+ * dvb_register_device - Registers a new DVB device
+ *
+ * @adap: pointer to struct dvb_adapter
+ * @pdvbdev: pointer to the place where the new struct dvb_device will be
+ * stored
+ * @template: Template used to create &pdvbdev;
+ * @priv: private data
+ * @type: type of the device, as defined by &enum dvb_device_type.
+ * @demux_sink_pads: Number of demux outputs, to be used to create the TS
+ * outputs via the Media Controller.
+ */
+int dvb_register_device(struct dvb_adapter *adap,
+ struct dvb_device **pdvbdev,
+ const struct dvb_device *template,
+ void *priv,
+ enum dvb_device_type type,
+ int demux_sink_pads);
+
+/**
+ * dvb_remove_device - Remove a registered DVB device
+ *
+ * This does not free memory. dvb_free_device() will do that when
+ * reference counter is empty
+ *
+ * @dvbdev: pointer to struct dvb_device
+ */
+void dvb_remove_device(struct dvb_device *dvbdev);
+
+
+/**
+ * dvb_unregister_device - Unregisters a DVB device
+ *
+ * @dvbdev: pointer to struct dvb_device
+ */
+void dvb_unregister_device(struct dvb_device *dvbdev);
+
+#ifdef CONFIG_MEDIA_CONTROLLER_DVB
+/**
+ * dvb_create_media_graph - Creates media graph for the Digital TV part of the
+ * device.
+ *
+ * @adap: pointer to &struct dvb_adapter
+ * @create_rf_connector: if true, it creates the RF connector too
+ *
+ * This function checks all DVB-related functions at the media controller
+ * entities and creates the needed links for the media graph. It is
+ * capable of working with multiple tuners or multiple frontends, but it
+ * won't create links if the device has multiple tuners and multiple frontends
+ * or if the device has multiple muxes. In such case, the caller driver should
+ * manually create the remaining links.
+ */
+__must_check int dvb_create_media_graph(struct dvb_adapter *adap,
+ bool create_rf_connector);
+
+/**
+ * dvb_register_media_controller - registers a media controller at DVB adapter
+ *
+ * @adap: pointer to &struct dvb_adapter
+ * @mdev: pointer to &struct media_device
+ */
+static inline void dvb_register_media_controller(struct dvb_adapter *adap,
+ struct media_device *mdev)
+{
+ adap->mdev = mdev;
+}
+
+/**
+ * dvb_get_media_controller - gets the associated media controller
+ *
+ * @adap: pointer to &struct dvb_adapter
+ */
+static inline struct media_device *
+dvb_get_media_controller(struct dvb_adapter *adap)
+{
+ return adap->mdev;
+}
+#else
+static inline
+int dvb_create_media_graph(struct dvb_adapter *adap,
+ bool create_rf_connector)
+{
+ return 0;
+};
+#define dvb_register_media_controller(a, b) {}
+#define dvb_get_media_controller(a) NULL
+#endif
+
+/**
+ * dvb_generic_open - Digital TV open function, used by DVB devices
+ *
+ * @inode: pointer to &struct inode.
+ * @file: pointer to &struct file.
+ *
+ * Checks if a DVB devnode is still valid, and if the permissions are
+ * OK and increment negative use count.
+ */
+int dvb_generic_open(struct inode *inode, struct file *file);
+
+/**
+ * dvb_generic_release - Digital TV close function, used by DVB devices
+ *
+ * @inode: pointer to &struct inode.
+ * @file: pointer to &struct file.
+ *
+ * Checks if a DVB devnode is still valid, and if the permissions are
+ * OK and decrement negative use count.
+ */
+int dvb_generic_release(struct inode *inode, struct file *file);
+
+/**
+ * dvb_generic_ioctl - Digital TV close function, used by DVB devices
+ *
+ * @file: pointer to &struct file.
+ * @cmd: Ioctl name.
+ * @arg: Ioctl argument.
+ *
+ * Checks if a DVB devnode and struct dvbdev.kernel_ioctl is still valid.
+ * If so, calls dvb_usercopy().
+ */
+long dvb_generic_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg);
+
+/**
+ * dvb_usercopy - copies data from/to userspace memory when an ioctl is
+ * issued.
+ *
+ * @file: Pointer to struct &file.
+ * @cmd: Ioctl name.
+ * @arg: Ioctl argument.
+ * @func: function that will actually handle the ioctl
+ *
+ * Ancillary function that uses ioctl direction and size to copy from
+ * userspace. Then, it calls @func, and, if needed, data is copied back
+ * to userspace.
+ */
+int dvb_usercopy(struct file *file, unsigned int cmd, unsigned long arg,
+ int (*func)(struct file *file, unsigned int cmd, void *arg));
+
+#if IS_ENABLED(CONFIG_I2C)
+
+struct i2c_adapter;
+struct i2c_client;
+/**
+ * dvb_module_probe - helper routine to probe an I2C module
+ *
+ * @module_name:
+ * Name of the I2C module to be probed
+ * @name:
+ * Optional name for the I2C module. Used for debug purposes.
+ * If %NULL, defaults to @module_name.
+ * @adap:
+ * pointer to &struct i2c_adapter that describes the I2C adapter where
+ * the module will be bound.
+ * @addr:
+ * I2C address of the adapter, in 7-bit notation.
+ * @platform_data:
+ * Platform data to be passed to the I2C module probed.
+ *
+ * This function binds an I2C device into the DVB core. Should be used by
+ * all drivers that use I2C bus to control the hardware. A module bound
+ * with dvb_module_probe() should use dvb_module_release() to unbind.
+ *
+ * Return:
+ * On success, return an &struct i2c_client, pointing to the bound
+ * I2C device. %NULL otherwise.
+ *
+ * .. note::
+ *
+ * In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
+ * macro, with does an ugly hack, using I2C low level functions. Such
+ * usage is deprecated and will be removed soon. Instead, use this routine.
+ */
+struct i2c_client *dvb_module_probe(const char *module_name,
+ const char *name,
+ struct i2c_adapter *adap,
+ unsigned char addr,
+ void *platform_data);
+
+/**
+ * dvb_module_release - releases an I2C device allocated with
+ * dvb_module_probe().
+ *
+ * @client: pointer to &struct i2c_client with the I2C client to be released.
+ * can be %NULL.
+ *
+ * This function should be used to free all resources reserved by
+ * dvb_module_probe() and unbinding the I2C hardware.
+ */
+void dvb_module_release(struct i2c_client *client);
+
+#endif /* CONFIG_I2C */
+
+/* Legacy generic DVB attach function. */
+#ifdef CONFIG_MEDIA_ATTACH
+
+/**
+ * dvb_attach - attaches a DVB frontend into the DVB core.
+ *
+ * @FUNCTION: function on a frontend module to be called.
+ * @ARGS: @FUNCTION arguments.
+ *
+ * This ancillary function loads a frontend module in runtime and runs
+ * the @FUNCTION function there, with @ARGS.
+ * As it increments symbol usage cont, at unregister, dvb_detach()
+ * should be called.
+ *
+ * .. note::
+ *
+ * In the past, DVB modules (mainly, frontends) were bound via dvb_attach()
+ * macro, with does an ugly hack, using I2C low level functions. Such
+ * usage is deprecated and will be removed soon. Instead, you should use
+ * dvb_module_probe().
+ */
+#define dvb_attach(FUNCTION, ARGS...) ({ \
+ void *__r = NULL; \
+ typeof(&FUNCTION) __a = symbol_request(FUNCTION); \
+ if (__a) { \
+ __r = (void *) __a(ARGS); \
+ if (__r == NULL) \
+ symbol_put(FUNCTION); \
+ } else { \
+ printk(KERN_ERR "DVB: Unable to find symbol "#FUNCTION"()\n"); \
+ } \
+ __r; \
+})
+
+/**
+ * dvb_detach - detaches a DVB frontend loaded via dvb_attach()
+ *
+ * @FUNC: attach function
+ *
+ * Decrements usage count for a function previously called via dvb_attach().
+ */
+
+#define dvb_detach(FUNC) symbol_put_addr(FUNC)
+
+#else
+#define dvb_attach(FUNCTION, ARGS...) ({ \
+ FUNCTION(ARGS); \
+})
+
+#define dvb_detach(FUNC) {}
+
+#endif /* CONFIG_MEDIA_ATTACH */
+
+#endif /* #ifndef _DVBDEV_H_ */