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ljca.h
/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (c) 2023, Intel Corporation. All rights reserved. */ #ifndef _LINUX_USB_LJCA_H_ #define _LINUX_USB_LJCA_H_ #include <linux/auxiliary_bus.h> #include <linux/list.h> #include <linux/spinlock.h> #include <linux/types.h> #define LJCA_MAX_GPIO_NUM 64 #define auxiliary_dev_to_ljca_client(auxiliary_dev) \ container_of(auxiliary_dev, struct ljca_client, auxdev) struct ljca_adapter; /** * typedef ljca_event_cb_t - event callback function signature * * @context: the execution context of who registered this callback * @cmd: the command from device for this event * @evt_data: the event data payload * @len: the event data payload length * * The callback function is called in interrupt context and the data payload is * only valid during the call. If the user needs later access of the data, it * must copy it. */ typedef void (*ljca_event_cb_t)(void *context, u8 cmd, const void *evt_data, int len); /** * struct ljca_client - represent a ljca client device * * @type: ljca client type * @id: ljca client id within same client type * @link: ljca client on the same ljca adapter * @auxdev: auxiliary device object * @adapter: ljca adapter the ljca client sit on * @context: the execution context of the event callback * @event_cb: ljca client driver register this callback to get * firmware asynchronous rx buffer pending notifications * @event_cb_lock: spinlock to protect event callback */ struct ljca_client { u8 type; u8 id; struct list_head link; struct auxiliary_device auxdev; struct ljca_adapter *adapter; void *context; ljca_event_cb_t event_cb; /* lock to protect event_cb */ spinlock_t event_cb_lock; }; /** * struct ljca_gpio_info - ljca gpio client device info * * @num: ljca gpio client device pin number * @valid_pin_map: ljca gpio client device valid pin mapping */ struct ljca_gpio_info { unsigned int num; DECLARE_BITMAP(valid_pin_map, LJCA_MAX_GPIO_NUM); }; /** * struct ljca_i2c_info - ljca i2c client device info * * @id: ljca i2c client device identification number * @capacity: ljca i2c client device capacity * @intr_pin: ljca i2c client device interrupt pin number if exists */ struct ljca_i2c_info { u8 id; u8 capacity; u8 intr_pin; }; /** * struct ljca_spi_info - ljca spi client device info * * @id: ljca spi client device identification number * @capacity: ljca spi client device capacity */ struct ljca_spi_info { u8 id; u8 capacity; }; /** * ljca_register_event_cb - register a callback function to receive events * * @client: ljca client device * @event_cb: callback function * @context: execution context of event callback * * Return: 0 in case of success, negative value in case of error */ int ljca_register_event_cb(struct ljca_client *client, ljca_event_cb_t event_cb, void *context); /** * ljca_unregister_event_cb - unregister the callback function for an event * * @client: ljca client device */ void ljca_unregister_event_cb(struct ljca_client *client); /** * ljca_transfer - issue a LJCA command and wait for a response * * @client: ljca client device * @cmd: the command to be sent to the device * @obuf: the buffer to be sent to the device; it can be NULL if the user * doesn't need to transmit data with this command * @obuf_len: the size of the buffer to be sent to the device; it should * be 0 when obuf is NULL * @ibuf: any data associated with the response will be copied here; it can be * NULL if the user doesn't need the response data * @ibuf_len: must be initialized to the input buffer size * * Return: the actual length of response data for success, negative value for errors */ int ljca_transfer(struct ljca_client *client, u8 cmd, const u8 *obuf, u8 obuf_len, u8 *ibuf, u8 ibuf_len); /** * ljca_transfer_noack - issue a LJCA command without a response * * @client: ljca client device * @cmd: the command to be sent to the device * @obuf: the buffer to be sent to the device; it can be NULL if the user * doesn't need to transmit data with this command * @obuf_len: the size of the buffer to be sent to the device * * Return: 0 for success, negative value for errors */ int ljca_transfer_noack(struct ljca_client *client, u8 cmd, const u8 *obuf, u8 obuf_len); #endif
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