116 lines
2.9 KiB
C
116 lines
2.9 KiB
C
/*
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* Initialization protocol for ISHTP driver
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*
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* Copyright (c) 2003-2016, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/miscdevice.h>
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#include "ishtp-dev.h"
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#include "hbm.h"
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#include "client.h"
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/**
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* ishtp_dev_state_str() -Convert to string format
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* @state: state to convert
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*
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* Convert state to string for prints
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*
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* Return: character pointer to converted string
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*/
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const char *ishtp_dev_state_str(int state)
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{
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switch (state) {
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case ISHTP_DEV_INITIALIZING:
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return "INITIALIZING";
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case ISHTP_DEV_INIT_CLIENTS:
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return "INIT_CLIENTS";
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case ISHTP_DEV_ENABLED:
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return "ENABLED";
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case ISHTP_DEV_RESETTING:
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return "RESETTING";
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case ISHTP_DEV_DISABLED:
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return "DISABLED";
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case ISHTP_DEV_POWER_DOWN:
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return "POWER_DOWN";
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case ISHTP_DEV_POWER_UP:
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return "POWER_UP";
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default:
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return "unknown";
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}
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}
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/**
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* ishtp_device_init() - ishtp device init
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* @dev: ISHTP device instance
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*
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* After ISHTP device is alloacted, this function is used to initialize
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* each field which includes spin lock, work struct and lists
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*/
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void ishtp_device_init(struct ishtp_device *dev)
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{
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dev->dev_state = ISHTP_DEV_INITIALIZING;
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INIT_LIST_HEAD(&dev->cl_list);
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INIT_LIST_HEAD(&dev->device_list);
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dev->rd_msg_fifo_head = 0;
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dev->rd_msg_fifo_tail = 0;
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spin_lock_init(&dev->rd_msg_spinlock);
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init_waitqueue_head(&dev->wait_hbm_recvd_msg);
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spin_lock_init(&dev->read_list_spinlock);
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spin_lock_init(&dev->device_lock);
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spin_lock_init(&dev->device_list_lock);
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spin_lock_init(&dev->cl_list_lock);
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spin_lock_init(&dev->fw_clients_lock);
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INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn);
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bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX);
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dev->open_handle_count = 0;
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/*
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* Reserving client ID 0 for ISHTP Bus Message communications
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*/
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bitmap_set(dev->host_clients_map, 0, 1);
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INIT_LIST_HEAD(&dev->read_list.list);
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}
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EXPORT_SYMBOL(ishtp_device_init);
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/**
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* ishtp_start() - Start ISH processing
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* @dev: ISHTP device instance
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*
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* Start ISHTP processing by sending query subscriber message
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*
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* Return: 0 on success else -ENODEV
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*/
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int ishtp_start(struct ishtp_device *dev)
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{
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if (ishtp_hbm_start_wait(dev)) {
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dev_err(dev->devc, "HBM haven't started");
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goto err;
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}
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/* suspend & resume notification - send QUERY_SUBSCRIBERS msg */
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ishtp_query_subscribers(dev);
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return 0;
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err:
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dev_err(dev->devc, "link layer initialization failed.\n");
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dev->dev_state = ISHTP_DEV_DISABLED;
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return -ENODEV;
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}
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EXPORT_SYMBOL(ishtp_start);
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