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For every ishtp client driver during initialization state, the flow is:
1 - Allocate an ISHTP client instance
2 - Reserve a host id and link the client instance
3 - Search a firmware client using UUID and get related
client information
4 - Bind firmware client id to the ISHTP client instance
5 - Set the state the ISHTP client instance to CONNECTING
6 - Send connect request to firmware
7 - Register event callback for messages from the firmware
During deinitizalization state, the flow is:
9 - Set the state the ISHTP client instance to ISHTP_CL_DISCONNECTING
10 - Issue disconnect request to firmware
11 - Unlike the client instance
12 - Flush message queue
13 - Free ISHTP client instance
Step 2-7 are identical to the steps of client driver initialization
and driver reset flow, but reallocation of the RX/TX ring buffers
can be avoided in reset flow.
Also for step 9-12, they are identical to the steps of client driver
failure handling after connect request, driver reset flow and
driver removing.
So, add two helper functions to simplify client driver code.
ishtp_cl_establish_connection()
ishtp_cl_destroy_connection()
No functional changes are expected.
Signed-off-by: Even Xu <even.xu@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
125 lines
4.2 KiB
C
125 lines
4.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Intel ISH client Interface definitions
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*
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* Copyright (c) 2019, Intel Corporation.
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*/
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#ifndef _INTEL_ISH_CLIENT_IF_H_
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#define _INTEL_ISH_CLIENT_IF_H_
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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struct ishtp_cl_device;
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struct ishtp_device;
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struct ishtp_cl;
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struct ishtp_fw_client;
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typedef __printf(2, 3) void (*ishtp_print_log)(struct ishtp_device *dev,
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const char *format, ...);
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/* Client state */
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enum cl_state {
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ISHTP_CL_INITIALIZING = 0,
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ISHTP_CL_CONNECTING,
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ISHTP_CL_CONNECTED,
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ISHTP_CL_DISCONNECTING,
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ISHTP_CL_DISCONNECTED
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};
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/**
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* struct ishtp_cl_device - ISHTP device handle
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* @driver: driver instance on a bus
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* @name: Name of the device for probe
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* @probe: driver callback for device probe
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* @remove: driver callback on device removal
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*
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* Client drivers defines to get probed/removed for ISHTP client device.
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*/
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struct ishtp_cl_driver {
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struct device_driver driver;
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const char *name;
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const struct ishtp_device_id *id;
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int (*probe)(struct ishtp_cl_device *dev);
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void (*remove)(struct ishtp_cl_device *dev);
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int (*reset)(struct ishtp_cl_device *dev);
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const struct dev_pm_ops *pm;
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};
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/**
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* struct ishtp_msg_data - ISHTP message data struct
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* @size: Size of data in the *data
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* @data: Pointer to data
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*/
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struct ishtp_msg_data {
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uint32_t size;
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unsigned char *data;
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};
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/*
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* struct ishtp_cl_rb - request block structure
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* @list: Link to list members
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* @cl: ISHTP client instance
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* @buffer: message header
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* @buf_idx: Index into buffer
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* @read_time: unused at this time
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*/
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struct ishtp_cl_rb {
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struct list_head list;
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struct ishtp_cl *cl;
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struct ishtp_msg_data buffer;
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unsigned long buf_idx;
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unsigned long read_time;
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};
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int ishtp_cl_driver_register(struct ishtp_cl_driver *driver,
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struct module *owner);
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void ishtp_cl_driver_unregister(struct ishtp_cl_driver *driver);
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int ishtp_register_event_cb(struct ishtp_cl_device *device,
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void (*read_cb)(struct ishtp_cl_device *));
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/* Get the device * from ishtp device instance */
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struct device *ishtp_device(struct ishtp_cl_device *cl_device);
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/* wait for IPC resume */
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bool ishtp_wait_resume(struct ishtp_device *dev);
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/* Trace interface for clients */
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ishtp_print_log ishtp_trace_callback(struct ishtp_cl_device *cl_device);
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/* Get device pointer of PCI device for DMA acces */
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struct device *ishtp_get_pci_device(struct ishtp_cl_device *cl_device);
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struct ishtp_cl *ishtp_cl_allocate(struct ishtp_cl_device *cl_device);
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void ishtp_cl_free(struct ishtp_cl *cl);
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int ishtp_cl_link(struct ishtp_cl *cl);
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void ishtp_cl_unlink(struct ishtp_cl *cl);
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int ishtp_cl_disconnect(struct ishtp_cl *cl);
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int ishtp_cl_connect(struct ishtp_cl *cl);
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int ishtp_cl_establish_connection(struct ishtp_cl *cl, const guid_t *uuid,
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int tx_size, int rx_size, bool reset);
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void ishtp_cl_destroy_connection(struct ishtp_cl *cl, bool reset);
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int ishtp_cl_send(struct ishtp_cl *cl, uint8_t *buf, size_t length);
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int ishtp_cl_flush_queues(struct ishtp_cl *cl);
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int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb);
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bool ishtp_cl_tx_empty(struct ishtp_cl *cl);
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struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl);
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void *ishtp_get_client_data(struct ishtp_cl *cl);
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void ishtp_set_client_data(struct ishtp_cl *cl, void *data);
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struct ishtp_device *ishtp_get_ishtp_device(struct ishtp_cl *cl);
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void ishtp_set_tx_ring_size(struct ishtp_cl *cl, int size);
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void ishtp_set_rx_ring_size(struct ishtp_cl *cl, int size);
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void ishtp_set_connection_state(struct ishtp_cl *cl, int state);
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void ishtp_cl_set_fw_client_id(struct ishtp_cl *cl, int fw_client_id);
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void ishtp_put_device(struct ishtp_cl_device *cl_dev);
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void ishtp_get_device(struct ishtp_cl_device *cl_dev);
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void ishtp_set_drvdata(struct ishtp_cl_device *cl_device, void *data);
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void *ishtp_get_drvdata(struct ishtp_cl_device *cl_device);
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struct ishtp_cl_device *ishtp_dev_to_cl_device(struct device *dev);
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int ishtp_register_event_cb(struct ishtp_cl_device *device,
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void (*read_cb)(struct ishtp_cl_device *));
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struct ishtp_fw_client *ishtp_fw_cl_get_client(struct ishtp_device *dev,
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const guid_t *uuid);
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int ishtp_get_fw_client_id(struct ishtp_fw_client *fw_client);
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int ish_hw_reset(struct ishtp_device *dev);
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#endif /* _INTEL_ISH_CLIENT_IF_H_ */
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