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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Initialization protocol for ISHTP driver4 *5 * Copyright (c) 2003-2016, Intel Corporation.6 */7 8#include <linux/devm-helpers.h>9#include <linux/export.h>10#include <linux/slab.h>11#include <linux/sched.h>12#include "ishtp-dev.h"13#include "hbm.h"14#include "client.h"15#include "loader.h"16 17/**18 * ishtp_dev_state_str() -Convert to string format19 * @state: state to convert20 *21 * Convert state to string for prints22 *23 * Return: character pointer to converted string24 */25const char *ishtp_dev_state_str(int state)26{27 switch (state) {28 case ISHTP_DEV_INITIALIZING:29 return "INITIALIZING";30 case ISHTP_DEV_INIT_CLIENTS:31 return "INIT_CLIENTS";32 case ISHTP_DEV_ENABLED:33 return "ENABLED";34 case ISHTP_DEV_RESETTING:35 return "RESETTING";36 case ISHTP_DEV_DISABLED:37 return "DISABLED";38 case ISHTP_DEV_POWER_DOWN:39 return "POWER_DOWN";40 case ISHTP_DEV_POWER_UP:41 return "POWER_UP";42 default:43 return "unknown";44 }45}46 47/**48 * ishtp_device_init() - ishtp device init49 * @dev: ISHTP device instance50 *51 * After ISHTP device is alloacted, this function is used to initialize52 * each field which includes spin lock, work struct and lists53 */54void ishtp_device_init(struct ishtp_device *dev)55{56 int ret;57 58 dev->dev_state = ISHTP_DEV_INITIALIZING;59 INIT_LIST_HEAD(&dev->cl_list);60 INIT_LIST_HEAD(&dev->device_list);61 dev->rd_msg_fifo_head = 0;62 dev->rd_msg_fifo_tail = 0;63 spin_lock_init(&dev->rd_msg_spinlock);64 65 init_waitqueue_head(&dev->wait_hbm_recvd_msg);66 init_waitqueue_head(&dev->wait_loader_recvd_msg);67 spin_lock_init(&dev->read_list_spinlock);68 spin_lock_init(&dev->device_lock);69 spin_lock_init(&dev->device_list_lock);70 spin_lock_init(&dev->cl_list_lock);71 spin_lock_init(&dev->fw_clients_lock);72 INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn);73 74 bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX);75 dev->open_handle_count = 0;76 77 /*78 * Reserving client ID 0 for ISHTP Bus Message communications79 */80 bitmap_set(dev->host_clients_map, 0, 1);81 82 INIT_LIST_HEAD(&dev->read_list.list);83 84 ret = devm_work_autocancel(dev->devc, &dev->work_fw_loader, ishtp_loader_work);85 if (ret)86 dev_err_probe(dev->devc, ret, "Failed to initialise FW loader work\n");87}88EXPORT_SYMBOL(ishtp_device_init);89 90/**91 * ishtp_start() - Start ISH processing92 * @dev: ISHTP device instance93 *94 * Start ISHTP processing by sending query subscriber message95 *96 * Return: 0 on success else -ENODEV97 */98int ishtp_start(struct ishtp_device *dev)99{100 if (ishtp_hbm_start_wait(dev)) {101 dev_err(dev->devc, "HBM haven't started");102 goto err;103 }104 105 /* suspend & resume notification - send QUERY_SUBSCRIBERS msg */106 ishtp_query_subscribers(dev);107 108 return 0;109err:110 dev_err(dev->devc, "link layer initialization failed.\n");111 dev->dev_state = ISHTP_DEV_DISABLED;112 return -ENODEV;113}114EXPORT_SYMBOL(ishtp_start);115