drivers/media/platform/msm/camera/cam_req_mgr/cam_req_mgr_debug.c

/* Copyright (c) 2016-2017, The Linux Foundation. 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.
 */

#include "cam_req_mgr_debug.h"

#define MAX_SESS_INFO_LINE_BUFF_LEN 256

static char sess_info_buffer[MAX_SESS_INFO_LINE_BUFF_LEN];

static int cam_req_mgr_debug_set_bubble_recovery(void *data, u64 val)
{
	struct cam_req_mgr_core_device  *core_dev = data;
	struct cam_req_mgr_core_session *session;
	int rc = 0;

	mutex_lock(&core_dev->crm_lock);

	if (!list_empty(&core_dev->session_head)) {
		list_for_each_entry(session,
			&core_dev->session_head, entry) {
			session->force_err_recovery = val;
		}
	}

	mutex_unlock(&core_dev->crm_lock);

	return rc;
}

static int cam_req_mgr_debug_get_bubble_recovery(void *data, u64 *val)
{
	struct cam_req_mgr_core_device *core_dev = data;
	struct cam_req_mgr_core_session *session;

	mutex_lock(&core_dev->crm_lock);

	if (!list_empty(&core_dev->session_head)) {
		session = list_first_entry(&core_dev->session_head,
			struct cam_req_mgr_core_session,
			entry);
		*val = session->force_err_recovery;
	}
	mutex_unlock(&core_dev->crm_lock);

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(bubble_recovery, cam_req_mgr_debug_get_bubble_recovery,
	cam_req_mgr_debug_set_bubble_recovery, "%lld\n");

static int session_info_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static ssize_t session_info_read(struct file *t_file, char *t_char,
	size_t t_size_t, loff_t *t_loff_t)
{
	int i;
	char *out_buffer = sess_info_buffer;
	char line_buffer[MAX_SESS_INFO_LINE_BUFF_LEN] = {0};
	struct cam_req_mgr_core_device *core_dev =
		(struct cam_req_mgr_core_device *) t_file->private_data;
	struct cam_req_mgr_core_session *session;

	memset(out_buffer, 0, MAX_SESS_INFO_LINE_BUFF_LEN);

	mutex_lock(&core_dev->crm_lock);

	if (!list_empty(&core_dev->session_head)) {
		list_for_each_entry(session,
			&core_dev->session_head, entry) {
			snprintf(line_buffer, sizeof(line_buffer),
				"session_hdl = %x \t"
				"num_links = %d\n",
				session->session_hdl, session->num_links);
			strlcat(out_buffer, line_buffer,
				sizeof(sess_info_buffer));
			for (i = 0; i < session->num_links; i++) {
				snprintf(line_buffer, sizeof(line_buffer),
					"link_hdl[%d] = 0x%x, num_devs connected = %d\n",
					i, session->links[i]->link_hdl,
					session->links[i]->num_devs);
				strlcat(out_buffer, line_buffer,
					sizeof(sess_info_buffer));
			}
		}
	}

	mutex_unlock(&core_dev->crm_lock);

	return simple_read_from_buffer(t_char, t_size_t,
		t_loff_t, out_buffer, strlen(out_buffer));
}

static ssize_t session_info_write(struct file *t_file,
	const char *t_char, size_t t_size_t, loff_t *t_loff_t)
{
	memset(sess_info_buffer, 0, MAX_SESS_INFO_LINE_BUFF_LEN);

	return 0;
}

static const struct file_operations session_info = {
	.open = session_info_open,
	.read = session_info_read,
	.write = session_info_write,
};

int cam_req_mgr_debug_register(struct cam_req_mgr_core_device *core_dev)
{
	struct dentry *debugfs_root;
	char dirname[32] = {0};

	snprintf(dirname, sizeof(dirname), "cam_req_mgr");
	debugfs_root = debugfs_create_dir(dirname, NULL);
	if (!debugfs_root)
		return -ENOMEM;

	if (!debugfs_create_file("sessions_info", 0644,
		debugfs_root, core_dev, &session_info))
		return -ENOMEM;

	if (!debugfs_create_file("bubble_recovery", 0644,
		debugfs_root, core_dev, &bubble_recovery))
		return -ENOMEM;

	return 0;
}