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/*
* drivers/soc/samsung/exynos-hdcp/exynos-hdcp.c
*
* Copyright (c) 2016 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/smc.h>
#include <asm/cacheflush.h>
#include <linux/soc/samsung/exynos-smc.h>
#include "exynos-hdcp2-teeif.h"
#include "exynos-hdcp2-log.h"
#include "exynos-hdcp2-dplink-if.h"
#include "exynos-hdcp2-dplink.h"
#include "exynos-hdcp2-dplink-inter.h"
#include "exynos-hdcp2-selftest.h"
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/dma-mapping.h>
#define EXYNOS_HDCP_DEV_NAME "hdcp2"
static struct miscdevice hdcp;
struct device *device_hdcp;
static DEFINE_MUTEX(hdcp_lock);
extern enum dp_state dp_hdcp_state;
struct hdcp_ctx {
struct delayed_work work;
/* debugfs root */
struct dentry *debug_dir;
/* seclog can be disabled via debugfs */
bool enabled;
unsigned int irq;
};
static struct hdcp_ctx h_ctx;
static uint32_t inst_num;
static ssize_t hdcp_write(struct file *file, const char __user *buf,
size_t len, loff_t *ppos)
{
hdcp_info("Kicking off selftest\n");
dp_hdcp_protocol_self_test();
return len;
}
static ssize_t hdcp_read(struct file *filp, char __user *buf,
size_t count, loff_t *f_pos)
{
return 0;
}
static int hdcp_open(struct inode *inode, struct file *file)
{
struct miscdevice *miscdev = file->private_data;
struct device *dev = miscdev->this_device;
struct hdcp_info *info;
info = kzalloc(sizeof(struct hdcp_info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = dev;
file->private_data = info;
mutex_lock(&hdcp_lock);
inst_num++;
/* todo: hdcp device initialize ? */
mutex_unlock(&hdcp_lock);
return 0;
}
static int hdcp_release(struct inode *inode, struct file *file)
{
struct hdcp_info *info = file->private_data;
/* disable drm if we were the one to turn it on */
mutex_lock(&hdcp_lock);
inst_num--;
/* todo: hdcp device finalize ? */
mutex_unlock(&hdcp_lock);
kfree(info);
return 0;
}
static void exynos_hdcp_worker(struct work_struct *work)
{
if (dp_hdcp_state == DP_DISCONNECT) {
hdcp_err("dp_disconnected\n");
return;
}
hdcp_info("Exynos HDCP interrupt occur by LDFW.\n");
hdcp_dplink_auth_control(HDCP2_ON);
}
static irqreturn_t exynos_hdcp_irq_handler(int irq, void *dev_id)
{
if (h_ctx.enabled) {
schedule_delayed_work(&h_ctx.work, msecs_to_jiffies(0));
}
return IRQ_HANDLED;
}
static int exynos_hdcp_probe(struct platform_device *pdev)
{
int err;
h_ctx.irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
if (!h_ctx.irq) {
dev_err(&pdev->dev, "Fail to get irq from dt\n");
return -EINVAL;
}
/* Get hardware interrupt number */
err = devm_request_irq(&pdev->dev, h_ctx.irq,
exynos_hdcp_irq_handler,
IRQF_TRIGGER_RISING, pdev->name, NULL);
device_hdcp = &pdev->dev;
// arch_setup_dma_ops(&pdev->dev, 0x0ULL, 1ULL << 36, NULL, false);
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
dma_set_mask(&pdev->dev, DMA_BIT_MASK(36));
if (err) {
dev_err(&pdev->dev,
"Fail to request IRQ handler. err(%d) irq(%d)\n",
err, h_ctx.irq);
return err;
}
/* Set workqueue for Secure log as bottom half */
INIT_DELAYED_WORK(&h_ctx.work, exynos_hdcp_worker);
h_ctx.enabled = true;
hdcp_info("Exynos HDCP driver probe done! (%d)\n", err);
return err;
}
static const struct of_device_id exynos_hdcp_of_match_table[] = {
{ .compatible = "samsung,exynos-hdcp", },
{ },
};
static struct platform_driver exynos_hdcp_driver = {
.probe = exynos_hdcp_probe,
.driver = {
.name = "exynos-hdcp",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(exynos_hdcp_of_match_table),
}
};
static int __init hdcp_init(void)
{
int ret;
hdcp_info("hdcp2 driver init\n");
ret = misc_register(&hdcp);
if (ret) {
hdcp_err("hdcp can't register misc on minor=%d\n",
MISC_DYNAMIC_MINOR);
return ret;
}
hdcp_session_list_init();
hdcp_tee_init();
return platform_driver_register(&exynos_hdcp_driver);
}
static void __exit hdcp_exit(void)
{
/* todo: do clear sequence */
cancel_delayed_work_sync(&h_ctx.work);
misc_deregister(&hdcp);
hdcp_session_list_destroy();
hdcp_tee_close();
platform_driver_unregister(&exynos_hdcp_driver);
}
static const struct file_operations hdcp_fops = {
.owner = THIS_MODULE,
.write = hdcp_write,
.read = hdcp_read,
.open = hdcp_open,
.release = hdcp_release,
};
static struct miscdevice hdcp = {
.minor = MISC_DYNAMIC_MINOR,
.name = EXYNOS_HDCP_DEV_NAME,
.fops = &hdcp_fops,
};
module_init(hdcp_init);
module_exit(hdcp_exit);
MODULE_DESCRIPTION("Exynos Secure hdcp driver");
MODULE_AUTHOR("<hakmin_1.kim@samsung.com>");
MODULE_LICENSE("GPL v2");
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