// SPDX-License-Identifier: GPL-2.0-only /* * HSI core. * * Copyright (C) 2010 Nokia Corporation. All rights reserved. * * Contact: Carlos Chinea <[email protected]> */ #include <linux/hsi/hsi.h> #include <linux/compiler.h> #include <linux/list.h> #include <linux/kobject.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/notifier.h> #include <linux/of.h> #include <linux/of_device.h> #include "hsi_core.h" static ssize_t modalias_show(struct device *dev, struct device_attribute *a __maybe_unused, char *buf) { … } static DEVICE_ATTR_RO(modalias); static struct attribute *hsi_bus_dev_attrs[] = …; ATTRIBUTE_GROUPS(…); static int hsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env) { … } static int hsi_bus_match(struct device *dev, const struct device_driver *driver) { … } static const struct bus_type hsi_bus_type = …; static void hsi_client_release(struct device *dev) { … } struct hsi_client *hsi_new_client(struct hsi_port *port, struct hsi_board_info *info) { … } EXPORT_SYMBOL_GPL(…); static void hsi_scan_board_info(struct hsi_controller *hsi) { … } #ifdef CONFIG_OF static struct hsi_board_info hsi_char_dev_info = …; static int hsi_of_property_parse_mode(struct device_node *client, char *name, unsigned int *result) { … } static int hsi_of_property_parse_flow(struct device_node *client, char *name, unsigned int *result) { … } static int hsi_of_property_parse_arb_mode(struct device_node *client, char *name, unsigned int *result) { … } static void hsi_add_client_from_dt(struct hsi_port *port, struct device_node *client) { … } void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients) { … } EXPORT_SYMBOL_GPL(…); #endif int hsi_remove_client(struct device *dev, void *data __maybe_unused) { … } EXPORT_SYMBOL_GPL(…); static int hsi_remove_port(struct device *dev, void *data __maybe_unused) { … } static void hsi_controller_release(struct device *dev) { … } static void hsi_port_release(struct device *dev) { … } /** * hsi_port_unregister_clients - Unregister an HSI port * @port: The HSI port to unregister */ void hsi_port_unregister_clients(struct hsi_port *port) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_unregister_controller - Unregister an HSI controller * @hsi: The HSI controller to register */ void hsi_unregister_controller(struct hsi_controller *hsi) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_register_controller - Register an HSI controller and its ports * @hsi: The HSI controller to register * * Returns -errno on failure, 0 on success. */ int hsi_register_controller(struct hsi_controller *hsi) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_register_client_driver - Register an HSI client to the HSI bus * @drv: HSI client driver to register * * Returns -errno on failure, 0 on success. */ int hsi_register_client_driver(struct hsi_client_driver *drv) { … } EXPORT_SYMBOL_GPL(…); static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused) { … } static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused) { … } /** * hsi_put_controller - Free an HSI controller * * @hsi: Pointer to the HSI controller to freed * * HSI controller drivers should only use this function if they need * to free their allocated hsi_controller structures before a successful * call to hsi_register_controller. Other use is not allowed. */ void hsi_put_controller(struct hsi_controller *hsi) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_alloc_controller - Allocate an HSI controller and its ports * @n_ports: Number of ports on the HSI controller * @flags: Kernel allocation flags * * Return NULL on failure or a pointer to an hsi_controller on success. */ struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_free_msg - Free an HSI message * @msg: Pointer to the HSI message * * Client is responsible to free the buffers pointed by the scatterlists. */ void hsi_free_msg(struct hsi_msg *msg) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_alloc_msg - Allocate an HSI message * @nents: Number of memory entries * @flags: Kernel allocation flags * * nents can be 0. This mainly makes sense for read transfer. * In that case, HSI drivers will call the complete callback when * there is data to be read without consuming it. * * Return NULL on failure or a pointer to an hsi_msg on success. */ struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_async - Submit an HSI transfer to the controller * @cl: HSI client sending the transfer * @msg: The HSI transfer passed to controller * * The HSI message must have the channel, ttype, complete and destructor * fields set beforehand. If nents > 0 then the client has to initialize * also the scatterlists to point to the buffers to write to or read from. * * HSI controllers relay on pre-allocated buffers from their clients and they * do not allocate buffers on their own. * * Once the HSI message transfer finishes, the HSI controller calls the * complete callback with the status and actual_len fields of the HSI message * updated. The complete callback can be called before returning from * hsi_async. * * Returns -errno on failure or 0 on success */ int hsi_async(struct hsi_client *cl, struct hsi_msg *msg) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_claim_port - Claim the HSI client's port * @cl: HSI client that wants to claim its port * @share: Flag to indicate if the client wants to share the port or not. * * Returns -errno on failure, 0 on success. */ int hsi_claim_port(struct hsi_client *cl, unsigned int share) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_release_port - Release the HSI client's port * @cl: HSI client which previously claimed its port */ void hsi_release_port(struct hsi_client *cl) { … } EXPORT_SYMBOL_GPL(…); static int hsi_event_notifier_call(struct notifier_block *nb, unsigned long event, void *data __maybe_unused) { … } /** * hsi_register_port_event - Register a client to receive port events * @cl: HSI client that wants to receive port events * @handler: Event handler callback * * Clients should register a callback to be able to receive * events from the ports. Registration should happen after * claiming the port. * The handler can be called in interrupt context. * * Returns -errno on error, or 0 on success. */ int hsi_register_port_event(struct hsi_client *cl, void (*handler)(struct hsi_client *, unsigned long)) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_unregister_port_event - Stop receiving port events for a client * @cl: HSI client that wants to stop receiving port events * * Clients should call this function before releasing their associated * port. * * Returns -errno on error, or 0 on success. */ int hsi_unregister_port_event(struct hsi_client *cl) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_event - Notifies clients about port events * @port: Port where the event occurred * @event: The event type * * Clients should not be concerned about wake line behavior. However, due * to a race condition in HSI HW protocol, clients need to be notified * about wake line changes, so they can implement a workaround for it. * * Events: * HSI_EVENT_START_RX - Incoming wake line high * HSI_EVENT_STOP_RX - Incoming wake line down * * Returns -errno on error, or 0 on success. */ int hsi_event(struct hsi_port *port, unsigned long event) { … } EXPORT_SYMBOL_GPL(…); /** * hsi_get_channel_id_by_name - acquire channel id by channel name * @cl: HSI client, which uses the channel * @name: name the channel is known under * * Clients can call this function to get the hsi channel ids similar to * requesting IRQs or GPIOs by name. This function assumes the same * channel configuration is used for RX and TX. * * Returns -errno on error or channel id on success. */ int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name) { … } EXPORT_SYMBOL_GPL(…); static int __init hsi_init(void) { … } postcore_initcall(hsi_init); static void __exit hsi_exit(void) { … } module_exit(hsi_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux