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-rw-r--r--drivers/hid/intel-ish-hid/ishtp/init.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp/init.c b/drivers/hid/intel-ish-hid/ishtp/init.c
new file mode 100644
index 000000000000..ac364418e17c
--- /dev/null
+++ b/drivers/hid/intel-ish-hid/ishtp/init.c
@@ -0,0 +1,115 @@
+/*
+ * Initialization protocol for ISHTP driver
+ *
+ * Copyright (c) 2003-2016, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/miscdevice.h>
+#include "ishtp-dev.h"
+#include "hbm.h"
+#include "client.h"
+
+/**
+ * ishtp_dev_state_str() -Convert to string format
+ * @state: state to convert
+ *
+ * Convert state to string for prints
+ *
+ * Return: character pointer to converted string
+ */
+const char *ishtp_dev_state_str(int state)
+{
+ switch (state) {
+ case ISHTP_DEV_INITIALIZING:
+ return "INITIALIZING";
+ case ISHTP_DEV_INIT_CLIENTS:
+ return "INIT_CLIENTS";
+ case ISHTP_DEV_ENABLED:
+ return "ENABLED";
+ case ISHTP_DEV_RESETTING:
+ return "RESETTING";
+ case ISHTP_DEV_DISABLED:
+ return "DISABLED";
+ case ISHTP_DEV_POWER_DOWN:
+ return "POWER_DOWN";
+ case ISHTP_DEV_POWER_UP:
+ return "POWER_UP";
+ default:
+ return "unknown";
+ }
+}
+
+/**
+ * ishtp_device_init() - ishtp device init
+ * @dev: ISHTP device instance
+ *
+ * After ISHTP device is alloacted, this function is used to initialize
+ * each field which includes spin lock, work struct and lists
+ */
+void ishtp_device_init(struct ishtp_device *dev)
+{
+ dev->dev_state = ISHTP_DEV_INITIALIZING;
+ INIT_LIST_HEAD(&dev->cl_list);
+ INIT_LIST_HEAD(&dev->device_list);
+ dev->rd_msg_fifo_head = 0;
+ dev->rd_msg_fifo_tail = 0;
+ spin_lock_init(&dev->rd_msg_spinlock);
+
+ init_waitqueue_head(&dev->wait_hbm_recvd_msg);
+ spin_lock_init(&dev->read_list_spinlock);
+ spin_lock_init(&dev->device_lock);
+ spin_lock_init(&dev->device_list_lock);
+ spin_lock_init(&dev->cl_list_lock);
+ spin_lock_init(&dev->fw_clients_lock);
+ INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn);
+
+ bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX);
+ dev->open_handle_count = 0;
+
+ /*
+ * Reserving client ID 0 for ISHTP Bus Message communications
+ */
+ bitmap_set(dev->host_clients_map, 0, 1);
+
+ INIT_LIST_HEAD(&dev->read_list.list);
+
+}
+EXPORT_SYMBOL(ishtp_device_init);
+
+/**
+ * ishtp_start() - Start ISH processing
+ * @dev: ISHTP device instance
+ *
+ * Start ISHTP processing by sending query subscriber message
+ *
+ * Return: 0 on success else -ENODEV
+ */
+int ishtp_start(struct ishtp_device *dev)
+{
+ if (ishtp_hbm_start_wait(dev)) {
+ dev_err(dev->devc, "HBM haven't started");
+ goto err;
+ }
+
+ /* suspend & resume notification - send QUERY_SUBSCRIBERS msg */
+ ishtp_query_subscribers(dev);
+
+ return 0;
+err:
+ dev_err(dev->devc, "link layer initialization failed.\n");
+ dev->dev_state = ISHTP_DEV_DISABLED;
+ return -ENODEV;
+}
+EXPORT_SYMBOL(ishtp_start);