drivers/misc/qseecom.c

/* Qualcomm Secure Execution Environment Communicator (QSEECOM) driver
 *
 * Copyright (c) 2012, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that 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.
 */

#define pr_fmt(fmt) "QSEECOM: %s: " fmt, __func__

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
#include <linux/debugfs.h>
#include <linux/cdev.h>
#include <linux/uaccess.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/io.h>
#include <linux/ion.h>
#include <linux/types.h>
#include <linux/clk.h>
#include <linux/qseecom.h>
#include <mach/msm_bus.h>
#include <mach/msm_bus_board.h>
#include <mach/scm.h>
#include <mach/peripheral-loader.h>
#include "qseecom_legacy.h"

#define QSEECOM_DEV			"qseecom"
#define QSEOS_VERSION_13		0x13
#define QSEOS_VERSION_14		0x14
#define QSEOS_CHECK_VERSION_CMD		0x00001803;

enum qseecom_command_scm_resp_type {
	QSEOS_APP_ID = 0xEE01,
	QSEOS_LISTENER_ID
};

enum qseecom_qceos_cmd_id {
	QSEOS_APP_START_COMMAND      = 0x01,
	QSEOS_APP_SHUTDOWN_COMMAND,
	QSEOS_APP_LOOKUP_COMMAND,
	QSEOS_REGISTER_LISTENER,
	QSEOS_DEREGISTER_LISTENER,
	QSEOS_CLIENT_SEND_DATA_COMMAND,
	QSEOS_LISTENER_DATA_RSP_COMMAND,
	QSEOS_CMD_MAX     = 0xEFFFFFFF
};

enum qseecom_qceos_cmd_status {
	QSEOS_RESULT_SUCCESS = 0,
	QSEOS_RESULT_INCOMPLETE,
	QSEOS_RESULT_FAILURE  = 0xFFFFFFFF
};

__packed struct qseecom_check_app_ireq {
	uint32_t qsee_cmd_id;
	char     app_name[MAX_APP_NAME_SIZE];
};

__packed struct qseecom_load_app_ireq {
	uint32_t qsee_cmd_id;
	uint32_t mdt_len;		/* Length of the mdt file */
	uint32_t img_len;		/* Length of .bxx and .mdt files */
	uint32_t phy_addr;		/* phy addr of the start of image */
	char     app_name[MAX_APP_NAME_SIZE];	/* application name*/
};

__packed struct qseecom_unload_app_ireq {
	uint32_t qsee_cmd_id;
	uint32_t  app_id;
};

__packed struct qseecom_register_listener_ireq {
	uint32_t qsee_cmd_id;
	uint32_t listener_id;
	void *sb_ptr;
	uint32_t sb_len;
};

__packed struct qseecom_unregister_listener_ireq {
	uint32_t qsee_cmd_id;
	uint32_t  listener_id;
};

__packed struct qseecom_client_send_data_ireq {
	uint32_t qsee_cmd_id;
	uint32_t app_id;
	void *req_ptr;
	uint32_t req_len;
	void *rsp_ptr;   /* First 4 bytes should always be the return status */
	uint32_t rsp_len;
};

/* send_data resp */
__packed struct qseecom_client_listener_data_irsp {
	uint32_t qsee_cmd_id;
	uint32_t listener_id;
};

/*
 * struct qseecom_command_scm_resp - qseecom response buffer
 * @cmd_status: value from enum tz_sched_cmd_status
 * @sb_in_rsp_addr: points to physical location of response
 *                buffer
 * @sb_in_rsp_len: length of command response
 */
__packed struct qseecom_command_scm_resp {
	uint32_t result;
	enum qseecom_command_scm_resp_type resp_type;
	unsigned int data;
};

static struct class *driver_class;
static dev_t qseecom_device_no;
static struct cdev qseecom_cdev;

/* Data structures used in legacy support */
static void *pil;
static uint32_t pil_ref_cnt;
static DEFINE_MUTEX(pil_access_lock);

static DEFINE_MUTEX(send_msg_lock);
static DEFINE_MUTEX(qsee_bw_mutex);
static DEFINE_MUTEX(app_access_lock);

static int qsee_bw_count;
static struct clk *qseecom_bus_clk;
static uint32_t qsee_perf_client;

struct qseecom_registered_listener_list {
	struct list_head                 list;
	struct qseecom_register_listener_req svc;
	u8  *sb_reg_req;
	u8 *sb_virt;
	s32 sb_phys;
	size_t sb_length;
	struct ion_handle *ihandle; /* Retrieve phy addr */

	wait_queue_head_t          rcv_req_wq;
	int                        rcv_req_flag;
};

struct qseecom_registered_app_list {
	struct list_head                 list;
	u32  app_id;
	u32  ref_cnt;
};

struct qseecom_control {
	struct ion_client *ion_clnt;		/* Ion client */
	struct list_head  registered_listener_list_head;
	spinlock_t        registered_listener_list_lock;

	struct list_head  registered_app_list_head;
	spinlock_t        registered_app_list_lock;

	wait_queue_head_t send_resp_wq;
	int               send_resp_flag;

	uint32_t          qseos_version;
};

struct qseecom_client_handle {
	u32  app_id;
	u8 *sb_virt;
	s32 sb_phys;
	uint32_t user_virt_sb_base;
	size_t sb_length;
	struct ion_handle *ihandle;		/* Retrieve phy addr */
};

struct qseecom_listener_handle {
	u32               id;
};

static struct qseecom_control qseecom;

struct qseecom_dev_handle {
	bool               service;
	union {
		struct qseecom_client_handle client;
		struct qseecom_listener_handle listener;
	};
	bool released;
	int               abort;
	wait_queue_head_t abort_wq;
	atomic_t          ioctl_count;
};

static int __qseecom_is_svc_unique(struct qseecom_dev_handle *data,
		struct qseecom_register_listener_req *svc)
{
	struct qseecom_registered_listener_list *ptr;
	int unique = 1;
	unsigned long flags;

	spin_lock_irqsave(&qseecom.registered_listener_list_lock, flags);
	list_for_each_entry(ptr, &qseecom.registered_listener_list_head, list) {
		if (ptr->svc.listener_id == svc->listener_id) {
			pr_err("Service id: %u is already registered\n",
					ptr->svc.listener_id);
			unique = 0;
			break;
		}
	}
	spin_unlock_irqrestore(&qseecom.registered_listener_list_lock, flags);
	return unique;
}

static struct qseecom_registered_listener_list *__qseecom_find_svc(
						int32_t listener_id)
{
	struct qseecom_registered_listener_list *entry = NULL;
	unsigned long flags;

	spin_lock_irqsave(&qseecom.registered_listener_list_lock, flags);
	list_for_each_entry(entry, &qseecom.registered_listener_list_head, list)
	{
		if (entry->svc.listener_id == listener_id)
			break;
	}
	spin_unlock_irqrestore(&qseecom.registered_listener_list_lock, flags);
	return entry;
}

static int __qseecom_set_sb_memory(struct qseecom_registered_listener_list *svc,
				struct qseecom_dev_handle *handle,
				struct qseecom_register_listener_req *listener)
{
	int ret = 0;
	unsigned int flags = 0;
	struct qseecom_register_listener_ireq req;
	struct qseecom_command_scm_resp resp;
	ion_phys_addr_t pa;

	/* Get the handle of the shared fd */
	svc->ihandle = ion_import_fd(qseecom.ion_clnt, listener->ifd_data_fd);
	if (svc->ihandle == NULL) {
		pr_err("Ion client could not retrieve the handle\n");
		return -ENOMEM;
	}

	/* Get the physical address of the ION BUF */
	ret = ion_phys(qseecom.ion_clnt, svc->ihandle, &pa, &svc->sb_length);

	/* Populate the structure for sending scm call to load image */
	svc->sb_virt = (char *) ion_map_kernel(qseecom.ion_clnt,
							svc->ihandle, flags);
	svc->sb_phys = pa;

	if (qseecom.qseos_version == QSEOS_VERSION_14) {
		req.qsee_cmd_id = QSEOS_REGISTER_LISTENER;
		req.listener_id = svc->svc.listener_id;
		req.sb_len = svc->sb_length;
		req.sb_ptr = (void *)svc->sb_phys;

		resp.result = QSEOS_RESULT_INCOMPLETE;

		ret = scm_call(SCM_SVC_TZSCHEDULER, 1,  &req,
					sizeof(req), &resp, sizeof(resp));
		if (ret) {
			pr_err("qseecom_scm_call failed with err: %d\n", ret);
			return -EINVAL;
		}

		if (resp.result != QSEOS_RESULT_SUCCESS) {
			pr_err("Error SB registration req: resp.result = %d\n",
					resp.result);
			return -EPERM;
		}
	} else {
		struct qseecom_command cmd;
		struct qseecom_response resp;
		struct qse_pr_init_sb_req_s sb_init_req;
		struct qse_pr_init_sb_rsp_s sb_init_rsp;

		svc->sb_reg_req = kzalloc((sizeof(sb_init_req) +
					sizeof(sb_init_rsp)), GFP_KERNEL);

		sb_init_req.pr_cmd = TZ_SCHED_CMD_ID_REGISTER_LISTENER;
		sb_init_req.listener_id = svc->svc.listener_id;
		sb_init_req.sb_len = svc->sb_length;
		sb_init_req.sb_ptr = svc->sb_phys;

		memcpy(svc->sb_reg_req, &sb_init_req, sizeof(sb_init_req));

		/* It will always be a new cmd from this method */
		cmd.cmd_type = TZ_SCHED_CMD_NEW;
		cmd.sb_in_cmd_addr = (u8 *)(virt_to_phys(svc->sb_reg_req));
		cmd.sb_in_cmd_len = sizeof(sb_init_req);

		resp.cmd_status = TZ_SCHED_STATUS_INCOMPLETE;

		ret = scm_call(SCM_SVC_TZSCHEDULER, 1, &cmd, sizeof(cmd)
				, &resp, sizeof(resp));

		if (ret) {
			pr_err("qseecom_scm_call failed with err: %d\n", ret);
			return -EINVAL;
		}

		if (resp.cmd_status != TZ_SCHED_STATUS_COMPLETE) {
			pr_err("SB registration fail resp.cmd_status %d\n",
							resp.cmd_status);
			return -EINVAL;
		}
		memset(svc->sb_virt, 0, svc->sb_length);
	}
	return 0;
}

static int qseecom_register_listener(struct qseecom_dev_handle *data,
					void __user *argp)
{
	int ret = 0;
	unsigned long flags;
	struct qseecom_register_listener_req rcvd_lstnr;
	struct qseecom_registered_listener_list *new_entry;

	ret = copy_from_user(&rcvd_lstnr, argp, sizeof(rcvd_lstnr));
	if (ret) {
		pr_err("copy_from_user failed\n");
		return ret;
	}
	data->listener.id = 0;
	data->service = true;
	if (!__qseecom_is_svc_unique(data, &rcvd_lstnr)) {
		pr_err("Service is not unique and is already registered\n");
		data->released = true;
		return -EBUSY;
	}

	new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL);
	if (!new_entry) {
		pr_err("kmalloc failed\n");
		return -ENOMEM;
	}
	memcpy(&new_entry->svc, &rcvd_lstnr, sizeof(rcvd_lstnr));
	new_entry->rcv_req_flag = 0;

	new_entry->svc.listener_id = rcvd_lstnr.listener_id;
	new_entry->sb_length = rcvd_lstnr.sb_size;
	if (__qseecom_set_sb_memory(new_entry, data, &rcvd_lstnr)) {
		pr_err("qseecom_set_sb_memoryfailed\n");
		kzfree(new_entry);
		return -ENOMEM;
	}

	data->listener.id = rcvd_lstnr.listener_id;
	init_waitqueue_head(&new_entry->rcv_req_wq);

	spin_lock_irqsave(&qseecom.registered_listener_list_lock, flags);
	list_add_tail(&new_entry->list, &qseecom.registered_listener_list_head);
	spin_unlock_irqrestore(&qseecom.registered_listener_list_lock, flags);

	return ret;
}

static int qseecom_unregister_listener(struct qseecom_dev_handle *data)
{
	int ret = 0;
	unsigned long flags;
	uint32_t unmap_mem = 0;
	struct qseecom_register_listener_ireq req;
	struct qseecom_registered_listener_list *ptr_svc = NULL;
	struct qseecom_command_scm_resp resp;
	struct ion_handle *ihandle = NULL;		/* Retrieve phy addr */

	if (qseecom.qseos_version == QSEOS_VERSION_14) {
		req.qsee_cmd_id = QSEOS_DEREGISTER_LISTENER;
		req.listener_id = data->listener.id;
		resp.result = QSEOS_RESULT_INCOMPLETE;

		ret = scm_call(SCM_SVC_TZSCHEDULER, 1,  &req,
					sizeof(req), &resp, sizeof(resp));
		if (ret) {
			pr_err("qseecom_scm_call failed with err: %d\n", ret);
			return ret;
		}

		if (resp.result != QSEOS_RESULT_SUCCESS) {
			pr_err("SB deregistartion: result=%d\n", resp.result);
			return -EPERM;
		}
	} else {
		struct qse_pr_init_sb_req_s sb_init_req;
		struct qseecom_command cmd;
		struct qseecom_response resp;
		struct qseecom_registered_listener_list *svc;

		svc = __qseecom_find_svc(data->listener.id);
		sb_init_req.pr_cmd = TZ_SCHED_CMD_ID_REGISTER_LISTENER;
		sb_init_req.listener_id = data->listener.id;
		sb_init_req.sb_len = 0;
		sb_init_req.sb_ptr = 0;

		memcpy(svc->sb_reg_req, &sb_init_req, sizeof(sb_init_req));

		/* It will always be a new cmd from this method */
		cmd.cmd_type = TZ_SCHED_CMD_NEW;
		cmd.sb_in_cmd_addr = (u8 *)(virt_to_phys(svc->sb_reg_req));
		cmd.sb_in_cmd_len = sizeof(sb_init_req);
		resp.cmd_status = TZ_SCHED_STATUS_INCOMPLETE;

		ret = scm_call(SCM_SVC_TZSCHEDULER, 1, &cmd, sizeof(cmd),
					&resp, sizeof(resp));
		if (ret) {
			pr_err("qseecom_scm_call failed with err: %d\n", ret);
			return ret;
		}
		kzfree(svc->sb_reg_req);
		if (resp.cmd_status != TZ_SCHED_STATUS_COMPLETE) {
			pr_err("Error with SB initialization\n");
			return -EPERM;
		}
	}
	data->abort = 1;
	spin_lock_irqsave(&qseecom.registered_listener_list_lock, flags);
	list_for_each_entry(ptr_svc, &qseecom.registered_listener_list_head,
			list) {
		if (ptr_svc->svc.listener_id == data->listener.id) {
			wake_up_all(&ptr_svc->rcv_req_wq);
			break;
		}
	}
	spin_unlock_irqrestore(&qseecom.registered_listener_list_lock, flags);

	while (atomic_read(&data->ioctl_count) > 1) {
		if (wait_event_interruptible(data->abort_wq,
				atomic_read(&data->ioctl_count) <= 1)) {
			pr_err("Interrupted from abort\n");
			ret = -ERESTARTSYS;
			break;
		}
	}

	spin_lock_irqsave(&qseecom.registered_listener_list_lock, flags);
	list_for_each_entry(ptr_svc,
			&qseecom.registered_listener_list_head,
			list)
	{
		if (ptr_svc->svc.listener_id == data->listener.id) {
			if (ptr_svc->sb_virt) {
				unmap_mem = 1;
				ihandle = ptr_svc->ihandle;
				}
			list_del(&ptr_svc->list);
			kzfree(ptr_svc);
			break;
		}
	}
	spin_unlock_irqrestore(&qseecom.registered_listener_list_lock, flags);

	/* Unmap the memory */
	if (unmap_mem) {
		if (!IS_ERR_OR_NULL(ihandle)) {
			ion_unmap_kernel(qseecom.ion_clnt, ihandle);
			ion_free(qseecom.ion_clnt, ihandle);
			}
	}
	data->released = true;
	return ret;
}

static int qseecom_set_client_mem_param(struct qseecom_dev_handle *data,
						void __user *argp)
{
	ion_phys_addr_t pa;
	int32_t ret;
	unsigned int flags = 0;
	struct qseecom_set_sb_mem_param_req req;
	uint32_t len;

	/* Copy the relevant information needed for loading the image */
	if (__copy_from_user(&req, (void __user *)argp, sizeof(req)))
		return -EFAULT;

	if (qseecom.qseos_version == QSEOS_VERSION_13) {
		long pil_error;
		mutex_lock(&pil_access_lock);
		if (pil_ref_cnt == 0) {
			pil = pil_get("tzapps");
			if (IS_ERR(pil)) {
				pr_err("Playready PIL image load failed\n");
				pil_error = PTR_ERR(pil);
				pil = NULL;
				pr_debug("tzapps image load FAILED\n");
				mutex_unlock(&pil_access_lock);
				return pil_error;
			}
		}
		pil_ref_cnt++;
		mutex_unlock(&pil_access_lock);
	}
	/* Get the handle of the shared fd */
	data->client.ihandle = ion_import_fd(qseecom.ion_clnt, req.ifd_data_fd);
	if (IS_ERR_OR_NULL(data->client.ihandle)) {
		pr_err("Ion client could not retrieve the handle\n");
		return -ENOMEM;
	}
	/* Get the physical address of the ION BUF */
	ret = ion_phys(qseecom.ion_clnt, data->client.ihandle, &pa, &len);
	/* Populate the structure for sending scm call to load image */
	data->client.sb_virt = (char *) ion_map_kernel(qseecom.ion_clnt,
							data->client.ihandle,
							flags);
	data->client.sb_phys = pa;
	data->client.sb_length = req.sb_len;
	data->client.user_virt_sb_base = req.virt_sb_base;
	return 0;
}


static int __qseecom_listener_has_sent_rsp(struct qseecom_dev_handle *data)
{
	int ret;
	ret = (qseecom.send_resp_flag != 0);
	return ret || data->abort;
}

static int __qseecom_process_incomplete_cmd(struct qseecom_dev_handle *data,
					struct qseecom_command_scm_resp *resp)
{
	int ret = 0;
	uint32_t lstnr;
	unsigned long flags;
	struct qseecom_client_listener_data_irsp send_data_rsp;
	struct qseecom_registered_listener_list *ptr_svc = NULL;


	while (resp->result == QSEOS_RESULT_INCOMPLETE) {
		lstnr = resp->data;
		/*
		 * Wake up blocking lsitener service with the lstnr id
		 */
		spin_lock_irqsave(&qseecom.registered_listener_list_lock,
					flags);
		list_for_each_entry(ptr_svc,
				&qseecom.registered_listener_list_head, list) {
			if (ptr_svc->svc.listener_id == lstnr) {
				ptr_svc->rcv_req_flag = 1;
				wake_up_interruptible(&ptr_svc->rcv_req_wq);
				break;
			}
		}
		spin_unlock_irqrestore(&qseecom.registered_listener_list_lock,
				flags);
		if (ptr_svc->svc.listener_id != lstnr) {
			pr_warning("Service requested for does on exist\n");
			return -ERESTARTSYS;
		}
		pr_debug("waking up rcv_req_wq and "
				"waiting for send_resp_wq\n");
		if (wait_event_interruptible(qseecom.send_resp_wq,
				__qseecom_listener_has_sent_rsp(data))) {
			pr_warning("Interrupted: exiting send_cmd loop\n");
			return -ERESTARTSYS;
		}

		if (data->abort) {
			pr_err("Aborting driver\n");
			return -ENODEV;
		}
		qseecom.send_resp_flag = 0;
		send_data_rsp.qsee_cmd_id = QSEOS_LISTENER_DATA_RSP_COMMAND;
		send_data_rsp.listener_id  = lstnr ;

		ret = scm_call(SCM_SVC_TZSCHEDULER, 1,
					(const void *)&send_data_rsp,
					sizeof(send_data_rsp), resp,
					sizeof(*resp));
		if (ret) {
			pr_err("qseecom_scm_call failed with err: %d\n", ret);
			return ret;
		}
	}
	return ret;
}

static int qseecom_load_app(struct qseecom_dev_handle *data, void __user *argp)
{
	struct qseecom_registered_app_list *entry = NULL;
	unsigned long flags = 0;
	u32 app_id = 0;
	struct ion_handle *ihandle;	/* Ion handle */
	struct qseecom_load_img_req load_img_req;
	int32_t ret;
	ion_phys_addr_t pa = 0;
	uint32_t len;
	struct qseecom_command_scm_resp resp;
	struct qseecom_check_app_ireq req;
	/* Copy the relevant information needed for loading the image */
	if (__copy_from_user(&load_img_req,
				(void __user *)argp,
				sizeof(struct qseecom_load_img_req))) {
		pr_err("copy_from_user failed\n");
		return -EFAULT;
	}

	req.qsee_cmd_id = QSEOS_APP_LOOKUP_COMMAND;
	memcpy(req.app_name, load_img_req.img_name, MAX_APP_NAME_SIZE);

	/*  SCM_CALL  to check if app_id for the mentioned app exists */
	ret = scm_call(SCM_SVC_TZSCHEDULER, 1,  &req,
				sizeof(struct qseecom_check_app_ireq),
				&resp, sizeof(resp));

	if (resp.result == QSEOS_RESULT_FAILURE)
		app_id = 0;
	else
		app_id = resp.data;

	if (app_id) {
		pr_warn("App id already exists\n");
		spin_lock_irqsave(&qseecom.registered_app_list_lock, flags);
		list_for_each_entry(entry,
				&qseecom.registered_app_list_head, list){
			if (entry->app_id == app_id) {
				entry->ref_cnt++;
				break;
			}
		}
		spin_unlock_irqrestore(
				&qseecom.registered_app_list_lock, flags);
	} else {
		struct qseecom_load_app_ireq load_req;

		pr_warn("App id does not exist\n");
		/* Get the handle of the shared fd */
		ihandle = ion_import_fd(qseecom.ion_clnt,
					load_img_req.ifd_data_fd);
		if (IS_ERR_OR_NULL(ihandle)) {
			pr_err("Ion client could not retrieve the handle\n");
			return -ENOMEM;
		}

		/* Get the physical address of the ION BUF */
		ret = ion_phys(qseecom.ion_clnt, ihandle, &pa, &len);

		/* Populate the structure for sending scm call to load image */
		load_req.qsee_cmd_id = QSEOS_APP_START_COMMAND;
		load_req.mdt_len = load_img_req.mdt_len;
		load_req.img_len = load_img_req.img_len;
		load_req.phy_addr = pa;

		/*  SCM_CALL  to load the app and get the app_id back */
		ret = scm_call(SCM_SVC_TZSCHEDULER, 1,  &load_req,
				sizeof(struct qseecom_load_app_ireq),
				&resp, sizeof(resp));

		if (resp.result == QSEOS_RESULT_INCOMPLETE) {
			ret = __qseecom_process_incomplete_cmd(data, &resp);
			if (ret) {
				pr_err("process_incomplete_cmd failed err: %d\n",
						ret);
				if (!IS_ERR_OR_NULL(ihandle))
					ion_free(qseecom.ion_clnt, ihandle);
				return ret;
			}
		}
		if (resp.result != QSEOS_RESULT_SUCCESS) {
			pr_err("scm_call failed resp.result != QSEOS_RESULT_SUCCESS\n");
			if (!IS_ERR_OR_NULL(ihandle))
				ion_free(qseecom.ion_clnt, ihandle);
			return -EFAULT;
		}

		app_id = resp.data;

		entry = kmalloc(sizeof(*entry), GFP_KERNEL);
		if (!entry) {
			pr_err("kmalloc failed\n");
			return -ENOMEM;
		}
		entry->app_id = app_id;
		entry->ref_cnt = 1;

		/* Deallocate the handle */
		if (!IS_ERR_OR_NULL(ihandle))
			ion_free(qseecom.ion_clnt, ihandle);

		spin_lock_irqsave(&qseecom.registered_app_list_lock, flags);
		list_add_tail(&entry->list, &qseecom.registered_app_list_head);
		spin_unlock_irqrestore(&qseecom.registered_app_list_lock,
					flags);
	}
	data->client.app_id = app_id;
	load_img_req.app_id = app_id;
	if (copy_to_user(argp, &load_img_req, sizeof(load_img_req))) {
		pr_err("copy_to_user failed\n");
		kzfree(entry);
		return -EFAULT;
	}
	return 0;
}

static int __qseecom_cleanup_app(struct qseecom_dev_handle *data)
{
	wake_up_all(&qseecom.send_resp_wq);
	while (atomic_read(&data->ioctl_count) > 1) {
		if (wait_event_interruptible(data->abort_wq,
					atomic_read(&data->ioctl_count) <= 1)) {
			pr_err("Interrupted from abort\n");
			return -ERESTARTSYS;
			break;
		}
	}
	/* Set unload app */
	return 1;
}

static int qseecom_unload_app(struct qseecom_dev_handle *data)
{
	unsigned long flags;
	int ret = 0;
	struct qseecom_command_scm_resp resp;
	struct qseecom_registered_app_list *ptr_app;
	uint32_t unload = 0;

	if (qseecom.qseos_version == QSEOS_VERSION_14) {
		spin_lock_irqsave(&qseecom.registered_app_list_lock, flags);
		list_for_each_entry(ptr_app, &qseecom.registered_app_list_head,
								list) {
			if (ptr_app->app_id == data->client.app_id) {
				if (ptr_app->ref_cnt == 1) {
					unload = __qseecom_cleanup_app(data);
					list_del(&ptr_app->list);
					kzfree(ptr_app);
					break;
				} else {
					ptr_app->ref_cnt--;
					data->released = true;
					break;
				}
			}
		}
		spin_unlock_irqrestore(&qseecom.registered_app_list_lock,
								flags);
	}
	if (!IS_ERR_OR_NULL(data->client.ihandle)) {
		ion_unmap_kernel(qseecom.ion_clnt, data->client.ihandle);
		ion_free(qseecom.ion_clnt, data->client.ihandle);
	}

	if ((unload) && (qseecom.qseos_version == QSEOS_VERSION_14)) {
		struct qseecom_unload_app_ireq req;

		/* Populate the structure for sending scm call to load image */
		req.qsee_cmd_id = QSEOS_APP_SHUTDOWN_COMMAND;
		req.app_id = data->client.app_id;

		/* SCM_CALL to unload the app */
		ret = scm_call(SCM_SVC_TZSCHEDULER, 1,  &req,
				sizeof(struct qseecom_unload_app_ireq),
				&resp, sizeof(resp));
		if (ret) {
			pr_err("Fail to unload APP\n");
			return -EFAULT;
		}
		if (resp.result == QSEOS_RESULT_INCOMPLETE) {
			ret = __qseecom_process_incomplete_cmd(data, &resp);
			if (ret) {
				pr_err("process_incomplete_cmd fail err: %d\n",
						ret);
				return ret;
			}
		}
	}

	if (qseecom.qseos_version == QSEOS_VERSION_13) {
		data->abort = 1;
		wake_up_all(&qseecom.send_resp_wq);
		while (atomic_read(&data->ioctl_count) > 0) {
			if (wait_event_interruptible(data->abort_wq,
					atomic_read(&data->ioctl_count) <= 0)) {
				pr_err("Interrupted from abort\n");
				ret = -ERESTARTSYS;
				break;
			}
		}
		mutex_lock(&pil_access_lock);
		if (pil_ref_cnt == 1)
			pil_put(pil);
		pil_ref_cnt--;
		mutex_unlock(&pil_access_lock);
	}
	data->released = true;
	return ret;
}

static uint32_t __qseecom_uvirt_to_kphys(struct qseecom_dev_handle *data,
						uint32_t virt)
{
	return data->client.sb_phys + (virt - data->client.user_virt_sb_base);
}

static int __qseecom_send_cmd_legacy(struct qseecom_dev_handle *data,
				struct qseecom_send_cmd_req *req)
{
	int ret = 0;
	unsigned long flags;
	u32 reqd_len_sb_in = 0;
	struct qseecom_command cmd;
	struct qseecom_response resp;


	if (req->cmd_req_buf == NULL || req->resp_buf == NULL) {
		pr_err("cmd buffer or response buffer is null\n");
		return -EINVAL;
	}

	if (req->cmd_req_len <= 0 ||
		req->resp_len <= 0 ||
		req->cmd_req_len > data->client.sb_length ||
		req->resp_len > data->client.sb_length) {
		pr_err("cmd buffer length or "
				"response buffer length not valid\n");
		return -EINVAL;
	}

	reqd_len_sb_in = req->cmd_req_len + req->resp_len;
	if (reqd_len_sb_in > data->client.sb_length) {
		pr_debug("Not enough memory to fit cmd_buf and "
			"resp_buf. Required: %u, Available: %u\n",
				reqd_len_sb_in, data->client.sb_length);
		return -ENOMEM;
	}
	cmd.cmd_type = TZ_SCHED_CMD_NEW;
	cmd.sb_in_cmd_addr = (u8 *) data->client.sb_phys;
	cmd.sb_in_cmd_len = req->cmd_req_len;

	resp.cmd_status = TZ_SCHED_STATUS_INCOMPLETE;
	resp.sb_in_rsp_addr = (u8 *)data->client.sb_phys + req->cmd_req_len;
	resp.sb_in_rsp_len = req->resp_len;

	ret = scm_call(SCM_SVC_TZSCHEDULER, 1, (const void *)&cmd,
					sizeof(cmd), &resp, sizeof(resp));

	if (ret) {
		pr_err("qseecom_scm_call_legacy failed with err: %d\n", ret);
		return ret;
	}

	while (resp.cmd_status != TZ_SCHED_STATUS_COMPLETE) {
		/*
		 * If cmd is incomplete, get the callback cmd out from SB out
		 * and put it on the list
		 */
		struct qseecom_registered_listener_list *ptr_svc = NULL;
		/*
		 * We don't know which service can handle the command. so we
		 * wake up all blocking services and let them figure out if
		 * they can handle the given command.
		 */
		spin_lock_irqsave(&qseecom.registered_listener_list_lock,
					flags);
		list_for_each_entry(ptr_svc,
				&qseecom.registered_listener_list_head, list) {
				ptr_svc->rcv_req_flag = 1;
				wake_up_interruptible(&ptr_svc->rcv_req_wq);
		}
		spin_unlock_irqrestore(&qseecom.registered_listener_list_lock,
				flags);

		pr_debug("waking up rcv_req_wq and "
				"waiting for send_resp_wq\n");
		if (wait_event_interruptible(qseecom.send_resp_wq,
				__qseecom_listener_has_sent_rsp(data))) {
			pr_warning("qseecom Interrupted: exiting send_cmd loop\n");
			return -ERESTARTSYS;
		}

		if (data->abort) {
			pr_err("Aborting driver\n");
			return -ENODEV;
		}
		qseecom.send_resp_flag = 0;
		cmd.cmd_type = TZ_SCHED_CMD_PENDING;
		ret = scm_call(SCM_SVC_TZSCHEDULER, 1, (const void *)&cmd,
					sizeof(cmd), &resp, sizeof(resp));
		if (ret) {
			pr_err("qseecom_scm_call failed with err: %d\n", ret);
			return ret;
		}
	}
	return ret;
}

static int __qseecom_send_cmd(struct qseecom_dev_handle *data,
				struct qseecom_send_cmd_req *req)
{
	int ret = 0;
	u32 reqd_len_sb_in = 0;
	struct qseecom_client_send_data_ireq send_data_req;
	struct qseecom_command_scm_resp resp;

	if (req->cmd_req_buf == NULL || req->resp_buf == NULL) {
		pr_err("cmd buffer or response buffer is null\n");
		return -EINVAL;
	}

	if (req->cmd_req_len <= 0 ||
		req->resp_len <= 0 ||
		req->cmd_req_len > data->client.sb_length ||
		req->resp_len > data->client.sb_length) {
		pr_err("cmd buffer length or "
				"response buffer length not valid\n");
		return -EINVAL;
	}

	reqd_len_sb_in = req->cmd_req_len + req->resp_len;
	if (reqd_len_sb_in > data->client.sb_length) {
		pr_debug("Not enough memory to fit cmd_buf and "
			"resp_buf. Required: %u, Available: %u\n",
				reqd_len_sb_in, data->client.sb_length);
		return -ENOMEM;
	}

	send_data_req.qsee_cmd_id = QSEOS_CLIENT_SEND_DATA_COMMAND;
	send_data_req.app_id = data->client.app_id;
	send_data_req.req_ptr = (void *)(__qseecom_uvirt_to_kphys(data,
					(uint32_t)req->cmd_req_buf));
	send_data_req.req_len = req->cmd_req_len;
	send_data_req.rsp_ptr = (void *)(__qseecom_uvirt_to_kphys(data,
					(uint32_t)req->resp_buf));
	send_data_req.rsp_len = req->resp_len;

	ret = scm_call(SCM_SVC_TZSCHEDULER, 1, (const void *) &send_data_req,
					sizeof(send_data_req),
					&resp, sizeof(resp));
	if (ret) {
		pr_err("qseecom_scm_call failed with err: %d\n", ret);
		return ret;
	}

	if (resp.result == QSEOS_RESULT_INCOMPLETE) {
		ret = __qseecom_process_incomplete_cmd(data, &resp);
		if (ret) {
			pr_err("process_incomplete_cmd failed err: %d\n", ret);
			return ret;
		}
	}
	return ret;
}


static int qseecom_send_cmd(struct qseecom_dev_handle *data, void __user *argp)
{
	int ret = 0;
	struct qseecom_send_cmd_req req;

	ret = copy_from_user(&req, argp, sizeof(req));
	if (ret) {
		pr_err("copy_from_user failed\n");
		return ret;
	}
	if (qseecom.qseos_version == QSEOS_VERSION_14)
		ret = __qseecom_send_cmd(data, &req);
	else
		ret = __qseecom_send_cmd_legacy(data, &req);
	if (ret)
		return ret;

	pr_debug("sending cmd_req->rsp size: %u, ptr: 0x%p\n",
			req.resp_len, req.resp_buf);
	return ret;
}

static int __qseecom_send_cmd_req_clean_up(
			struct qseecom_send_modfd_cmd_req *req)
{
	char *field;
	uint32_t *update;
	int ret = 0;
	int i = 0;

	for (i = 0; i < MAX_ION_FD; i++) {
		if (req->ifd_data[i].fd != 0) {
			field = (char *)req->cmd_req_buf +
					req->ifd_data[i].cmd_buf_offset;
			update = (uint32_t *) field;
			*update = 0;
		}
	}
	return ret;
}

static int __qseecom_update_with_phy_addr(
			struct qseecom_send_modfd_cmd_req *req)
{
	struct ion_handle *ihandle;
	char *field;
	uint32_t *update;
	ion_phys_addr_t pa;
	int ret = 0;
	int i = 0;
	uint32_t length;

	for (i = 0; i < MAX_ION_FD; i++) {
		if (req->ifd_data[i].fd != 0) {
			/* Get the handle of the shared fd */
			ihandle = ion_import_fd(qseecom.ion_clnt,
						req->ifd_data[i].fd);
			if (IS_ERR_OR_NULL(ihandle)) {
				pr_err("Ion client can't retrieve the handle\n");
				return -ENOMEM;
			}
			field = (char *) req->cmd_req_buf +
						req->ifd_data[i].cmd_buf_offset;
			update = (uint32_t *) field;

			/* Populate the cmd data structure with the phys_addr */
			ret = ion_phys(qseecom.ion_clnt, ihandle, &pa, &length);
			if (ret)
				return -ENOMEM;

			*update = (uint32_t)pa;
			/* Deallocate the handle */
			if (!IS_ERR_OR_NULL(ihandle))
				ion_free(qseecom.ion_clnt, ihandle);
		}
	}
	return ret;
}

static int qseecom_send_modfd_cmd(struct qseecom_dev_handle *data,
					void __user *argp)
{
	int ret = 0;
	struct qseecom_send_modfd_cmd_req req;
	struct qseecom_send_cmd_req send_cmd_req;

	ret = copy_from_user(&req, argp, sizeof(req));
	if (ret) {
		pr_err("copy_from_user failed\n");
		return ret;
	}
	send_cmd_req.cmd_req_buf = req.cmd_req_buf;
	send_cmd_req.cmd_req_len = req.cmd_req_len;
	send_cmd_req.resp_buf = req.resp_buf;
	send_cmd_req.resp_len = req.resp_len;

	ret = __qseecom_update_with_phy_addr(&req);
	if (ret)
		return ret;
	if (qseecom.qseos_version == QSEOS_VERSION_14)
		ret = __qseecom_send_cmd(data, &send_cmd_req);
	else
		ret = __qseecom_send_cmd_legacy(data, &send_cmd_req);
	__qseecom_send_cmd_req_clean_up(&req);

	if (ret)
		return ret;

	pr_debug("sending cmd_req->rsp size: %u, ptr: 0x%p\n",
			req.resp_len, req.resp_buf);
	return ret;
}

static int __qseecom_listener_has_rcvd_req(struct qseecom_dev_handle *data,
		struct qseecom_registered_listener_list *svc)
{
	int ret;
	ret = (svc->rcv_req_flag != 0);
	return ret || data->abort;
}

static int qseecom_receive_req(struct qseecom_dev_handle *data)
{
	int ret = 0;
	struct qseecom_registered_listener_list *this_lstnr;

	this_lstnr = __qseecom_find_svc(data->listener.id);
	while (1) {
		if (wait_event_interruptible(this_lstnr->rcv_req_wq,
				__qseecom_listener_has_rcvd_req(data,
				this_lstnr))) {
			pr_warning("Interrupted: exiting wait_rcv_req loop\n");
			/* woken up for different reason */
			return -ERESTARTSYS;
		}

		if (data->abort) {
			pr_err("Aborting driver!\n");
			return -ENODEV;
		}
		this_lstnr->rcv_req_flag = 0;
		if (qseecom.qseos_version == QSEOS_VERSION_13) {
			if (*((uint32_t *)this_lstnr->sb_virt) != 0)
				break;
		} else {
			break;
		}
	}
	return ret;
}

static int qseecom_send_resp(void)
{
	qseecom.send_resp_flag = 1;
	wake_up_interruptible(&qseecom.send_resp_wq);
	return 0;
}

static int qseecom_get_qseos_version(struct qseecom_dev_handle *data,
						void __user *argp)
{
	struct qseecom_qseos_version_req req;

	if (copy_from_user(&req, argp, sizeof(req))) {
		pr_err("copy_from_user failed");
		return -EINVAL;
	}
	req.qseos_version = qseecom.qseos_version;
	if (copy_to_user(argp, &req, sizeof(req))) {
		pr_err("copy_to_user failed");
		return -EINVAL;
	}
	return 0;
}

static int qsee_vote_for_clock(void)
{
	int ret = 0;

	if (!qsee_perf_client)
		return -EINVAL;

	mutex_lock(&qsee_bw_mutex);
	if (!qsee_bw_count) {
		ret = msm_bus_scale_client_update_request(
				qsee_perf_client, 1);
		if (ret) {
			pr_err("Bandwidth request failed (%d)\n", ret);
		} else {
			ret = clk_enable(qseecom_bus_clk);
			if (ret)
				pr_err("Clock enable failed\n");
		}
	}
	if (ret)
		msm_bus_scale_client_update_request(qsee_perf_client, 0);
	else
		qsee_bw_count++;

	mutex_unlock(&qsee_bw_mutex);
	return ret;
}

static void qsee_disable_clock_vote(void)
{
	if (!qsee_perf_client)
		return ;

	mutex_lock(&qsee_bw_mutex);
	if (qsee_bw_count > 0) {
		if (qsee_bw_count-- == 1) {
			msm_bus_scale_client_update_request(qsee_perf_client,
							0);
			clk_disable(qseecom_bus_clk);
		}
	}
	mutex_unlock(&qsee_bw_mutex);
}


static long qseecom_ioctl(struct file *file, unsigned cmd,
		unsigned long arg)
{
	int ret = 0;
	struct qseecom_dev_handle *data = file->private_data;
	void __user *argp = (void __user *) arg;

	if (data->abort) {
		pr_err("Aborting qseecom driver\n");
		return -ENODEV;
	}

	switch (cmd) {
	case QSEECOM_IOCTL_REGISTER_LISTENER_REQ: {
		pr_debug("ioctl register_listener_req()\n");
		atomic_inc(&data->ioctl_count);
		ret = qseecom_register_listener(data, argp);
		atomic_dec(&data->ioctl_count);
		wake_up_all(&data->abort_wq);
		if (ret)
			pr_err("failed qseecom_register_listener: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_UNREGISTER_LISTENER_REQ: {
		pr_debug("ioctl unregister_listener_req()\n");
		atomic_inc(&data->ioctl_count);
		ret = qseecom_unregister_listener(data);
		atomic_dec(&data->ioctl_count);
		wake_up_all(&data->abort_wq);
		if (ret)
			pr_err("failed qseecom_unregister_listener: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_SEND_CMD_REQ: {
		/* Only one client allowed here at a time */
		mutex_lock(&send_msg_lock);
		atomic_inc(&data->ioctl_count);
		ret = qseecom_send_cmd(data, argp);
		atomic_dec(&data->ioctl_count);
		wake_up_all(&data->abort_wq);
		mutex_unlock(&send_msg_lock);
		if (ret)
			pr_err("failed qseecom_send_cmd: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_SEND_MODFD_CMD_REQ: {
		/* Only one client allowed here at a time */
		mutex_lock(&send_msg_lock);
		atomic_inc(&data->ioctl_count);
		ret = qseecom_send_modfd_cmd(data, argp);
		atomic_dec(&data->ioctl_count);
		wake_up_all(&data->abort_wq);
		mutex_unlock(&send_msg_lock);
		if (ret)
			pr_err("failed qseecom_send_cmd: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_RECEIVE_REQ: {
		atomic_inc(&data->ioctl_count);
		ret = qseecom_receive_req(data);
		atomic_dec(&data->ioctl_count);
		wake_up_all(&data->abort_wq);
		if (ret)
			pr_err("failed qseecom_receive_req: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_SEND_RESP_REQ: {
		atomic_inc(&data->ioctl_count);
		ret = qseecom_send_resp();
		atomic_dec(&data->ioctl_count);
		wake_up_all(&data->abort_wq);
		if (ret)
			pr_err("failed qseecom_send_resp: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_SET_MEM_PARAM_REQ: {
		ret = qseecom_set_client_mem_param(data, argp);
		if (ret)
			pr_err("failed Qqseecom_set_mem_param request: %d\n",
								ret);
		break;
	}
	case QSEECOM_IOCTL_LOAD_APP_REQ: {
		mutex_lock(&app_access_lock);
		atomic_inc(&data->ioctl_count);
		ret = qseecom_load_app(data, argp);
		atomic_dec(&data->ioctl_count);
		mutex_unlock(&app_access_lock);
		if (ret)
			pr_err("failed load_app request: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_UNLOAD_APP_REQ: {
		mutex_lock(&app_access_lock);
		atomic_inc(&data->ioctl_count);
		ret = qseecom_unload_app(data);
		atomic_dec(&data->ioctl_count);
		mutex_unlock(&app_access_lock);
		if (ret)
			pr_err("failed unload_app request: %d\n", ret);
		break;
	}
	case QSEECOM_IOCTL_GET_QSEOS_VERSION_REQ: {
		atomic_inc(&data->ioctl_count);
		ret = qseecom_get_qseos_version(data, argp);
		if (ret)
			pr_err("qseecom_get_qseos_version: %d\n", ret);
		atomic_dec(&data->ioctl_count);
		break;
	}
	case QSEECOM_IOCTL_PERF_ENABLE_REQ:{
		atomic_inc(&data->ioctl_count);
		ret = qsee_vote_for_clock();
		if (ret)
			pr_err("Failed to vote for clock%d\n", ret);
		atomic_dec(&data->ioctl_count);
		break;
	}
	case QSEECOM_IOCTL_PERF_DISABLE_REQ:{
		atomic_inc(&data->ioctl_count);
		qsee_disable_clock_vote();
		atomic_dec(&data->ioctl_count);
		break;
	}
	default:
		return -EINVAL;
	}
	return ret;
}

static int qseecom_open(struct inode *inode, struct file *file)
{
	int ret = 0;
	struct qseecom_dev_handle *data;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data) {
		pr_err("kmalloc failed\n");
		return -ENOMEM;
	}
	file->private_data = data;
	data->abort = 0;
	data->service = false;
	data->released = false;
	init_waitqueue_head(&data->abort_wq);
	atomic_set(&data->ioctl_count, 0);
	return ret;
}

static int qseecom_release(struct inode *inode, struct file *file)
{
	struct qseecom_dev_handle *data = file->private_data;
	int ret = 0;

	if (data->released == false) {
		pr_warn("data->released == false\n");
		if (data->service)
			ret = qseecom_unregister_listener(data);
		else
			ret = qseecom_unload_app(data);
		if (ret) {
			pr_err("Close failed\n");
			return ret;
		}
	}
	kfree(data);
	return ret;
}

/* qseecom bus scaling */
static struct msm_bus_paths qsee_bw_table[] = {
	{
		.vectors = (struct msm_bus_vectors[]){
			{
				.src = MSM_BUS_MASTER_SPS,
				.dst = MSM_BUS_SLAVE_EBI_CH0,
			},
		},
		.num_paths = 1,
	},
	{
		.vectors = (struct msm_bus_vectors[]){
			{
				.src = MSM_BUS_MASTER_SPS,
				.dst = MSM_BUS_SLAVE_EBI_CH0,
				.ib = (492 * 8) * 1000000UL,
				.ab = (492 * 8) *  100000UL,
			},
		},
		.num_paths = 1,
	},
};

static struct msm_bus_scale_pdata qsee_bus_pdata = {
	.usecase = qsee_bw_table,
	.num_usecases = ARRAY_SIZE(qsee_bw_table),
	.name = "qsee",
};

static const struct file_operations qseecom_fops = {
		.owner = THIS_MODULE,
		.unlocked_ioctl = qseecom_ioctl,
		.open = qseecom_open,
		.release = qseecom_release
};

static int __init qseecom_init(void)
{
	int rc;
	int ret = 0;
	struct device *class_dev;
	char qsee_not_legacy = 0;
	uint32_t system_call_id = QSEOS_CHECK_VERSION_CMD;

	rc = alloc_chrdev_region(&qseecom_device_no, 0, 1, QSEECOM_DEV);
	if (rc < 0) {
		pr_err("alloc_chrdev_region failed %d\n", rc);
		return rc;
	}

	driver_class = class_create(THIS_MODULE, QSEECOM_DEV);
	if (IS_ERR(driver_class)) {
		rc = -ENOMEM;
		pr_err("class_create failed %d\n", rc);
		goto unregister_chrdev_region;
	}

	class_dev = device_create(driver_class, NULL, qseecom_device_no, NULL,
			QSEECOM_DEV);
	if (!class_dev) {
		pr_err("class_device_create failed %d\n", rc);
		rc = -ENOMEM;
		goto class_destroy;
	}

	cdev_init(&qseecom_cdev, &qseecom_fops);
	qseecom_cdev.owner = THIS_MODULE;

	rc = cdev_add(&qseecom_cdev, MKDEV(MAJOR(qseecom_device_no), 0), 1);
	if (rc < 0) {
		pr_err("cdev_add failed %d\n", rc);
		goto err;
	}

	INIT_LIST_HEAD(&qseecom.registered_listener_list_head);
	spin_lock_init(&qseecom.registered_listener_list_lock);
	INIT_LIST_HEAD(&qseecom.registered_app_list_head);
	spin_lock_init(&qseecom.registered_app_list_lock);
	init_waitqueue_head(&qseecom.send_resp_wq);
	qseecom.send_resp_flag = 0;

	rc = scm_call(6, 1, &system_call_id, sizeof(system_call_id),
				&qsee_not_legacy, sizeof(qsee_not_legacy));
	if (rc) {
		pr_err("Failed to retrieve QSEE version information %d\n", rc);
		goto err;
	}
	if (qsee_not_legacy)
		qseecom.qseos_version = QSEOS_VERSION_14;
	else {
		qseecom.qseos_version = QSEOS_VERSION_13;
		pil = NULL;
		pil_ref_cnt = 0;
	}
	/* Create ION msm client */
	qseecom.ion_clnt = msm_ion_client_create(0x03, "qseecom-kernel");
	if (qseecom.ion_clnt == NULL) {
		pr_err("Ion client cannot be created\n");
		rc = -ENOMEM;
		goto err;
	}

	/* register client for bus scaling */
	qsee_perf_client = msm_bus_scale_register_client(&qsee_bus_pdata);
	if (!qsee_perf_client)
		pr_err("Unable to register bus client\n");

	qseecom_bus_clk = clk_get_sys("scm", "bus_clk");
	if (!IS_ERR(qseecom_bus_clk)) {
		ret = clk_set_rate(qseecom_bus_clk, 64000000);
		if (ret) {
			qseecom_bus_clk = NULL;
			pr_err("Unable to set clock rate\n");
		}
	} else {
		qseecom_bus_clk = NULL;
		pr_warn("Unable to get bus clk\n");
	}
	return 0;
err:
	device_destroy(driver_class, qseecom_device_no);
class_destroy:
	class_destroy(driver_class);
unregister_chrdev_region:
	unregister_chrdev_region(qseecom_device_no, 1);
	return rc;
}

static void __exit qseecom_exit(void)
{
	device_destroy(driver_class, qseecom_device_no);
	class_destroy(driver_class);
	unregister_chrdev_region(qseecom_device_no, 1);
	ion_client_destroy(qseecom.ion_clnt);
}

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm Secure Execution Environment Communicator");

module_init(qseecom_init);
module_exit(qseecom_exit);