// SPDX-License-Identifier: GPL-2.0-or-later
/*
	Mantis PCI bridge driver

	Copyright (C) Manu Abraham (abraham.manu@gmail.com)

*/

#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <asm/io.h>

#include <media/dmxdev.h>
#include <media/dvbdev.h>
#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/dvb_net.h>

#include "mantis_common.h"
#include "mantis_link.h"
#include "mantis_hif.h"
#include "mantis_reg.h"

#include "mantis_ca.h"

static int mantis_ca_read_attr_mem(struct dvb_ca_en50221 *en50221, int slot, int addr)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): Request Attribute Mem Read", slot);

	if (slot != 0)
		return -EINVAL;

	return mantis_hif_read_mem(ca, addr);
}

static int mantis_ca_write_attr_mem(struct dvb_ca_en50221 *en50221, int slot, int addr, u8 data)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): Request Attribute Mem Write", slot);

	if (slot != 0)
		return -EINVAL;

	return mantis_hif_write_mem(ca, addr, data);
}

static int mantis_ca_read_cam_ctl(struct dvb_ca_en50221 *en50221, int slot, u8 addr)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): Request CAM control Read", slot);

	if (slot != 0)
		return -EINVAL;

	return mantis_hif_read_iom(ca, addr);
}

static int mantis_ca_write_cam_ctl(struct dvb_ca_en50221 *en50221, int slot, u8 addr, u8 data)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): Request CAM control Write", slot);

	if (slot != 0)
		return -EINVAL;

	return mantis_hif_write_iom(ca, addr, data);
}

static int mantis_ca_slot_reset(struct dvb_ca_en50221 *en50221, int slot)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): Slot RESET", slot);
	udelay(500); /* Wait.. */
	mmwrite(0xda, MANTIS_PCMCIA_RESET); /* Leading edge assert */
	udelay(500);
	mmwrite(0x00, MANTIS_PCMCIA_RESET); /* Trailing edge deassert */
	msleep(1000);
	dvb_ca_en50221_camready_irq(&ca->en50221, 0);

	return 0;
}

static int mantis_ca_slot_shutdown(struct dvb_ca_en50221 *en50221, int slot)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): Slot shutdown", slot);

	return 0;
}

static int mantis_ts_control(struct dvb_ca_en50221 *en50221, int slot)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): TS control", slot);

	return 0;
}

static int mantis_slot_status(struct dvb_ca_en50221 *en50221, int slot, int open)
{
	struct mantis_ca *ca = en50221->data;
	struct mantis_pci *mantis = ca->ca_priv;

	dprintk(MANTIS_DEBUG, 1, "Slot(%d): Poll Slot status", slot);

	if (ca->slot_state == MODULE_INSERTED) {
		dprintk(MANTIS_DEBUG, 1, "CA Module present and ready");
		return DVB_CA_EN50221_POLL_CAM_PRESENT | DVB_CA_EN50221_POLL_CAM_READY;
	} else {
		dprintk(MANTIS_DEBUG, 1, "CA Module not present or not ready");
	}

	return 0;
}

int mantis_ca_init(struct mantis_pci *mantis)
{
	struct dvb_adapter *dvb_adapter	= &mantis->dvb_adapter;
	struct mantis_ca *ca;
	int ca_flags = 0, result;

	dprintk(MANTIS_DEBUG, 1, "Initializing Mantis CA");
	ca = kzalloc(sizeof(struct mantis_ca), GFP_KERNEL);
	if (!ca) {
		dprintk(MANTIS_ERROR, 1, "Out of memory!, exiting ..");
		result = -ENOMEM;
		goto err;
	}

	ca->ca_priv		= mantis;
	mantis->mantis_ca	= ca;
	ca_flags		= DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE;
	/* register CA interface */
	ca->en50221.owner		= THIS_MODULE;
	ca->en50221.read_attribute_mem	= mantis_ca_read_attr_mem;
	ca->en50221.write_attribute_mem	= mantis_ca_write_attr_mem;
	ca->en50221.read_cam_control	= mantis_ca_read_cam_ctl;
	ca->en50221.write_cam_control	= mantis_ca_write_cam_ctl;
	ca->en50221.slot_reset		= mantis_ca_slot_reset;
	ca->en50221.slot_shutdown	= mantis_ca_slot_shutdown;
	ca->en50221.slot_ts_enable	= mantis_ts_control;
	ca->en50221.poll_slot_status	= mantis_slot_status;
	ca->en50221.data		= ca;

	mutex_init(&ca->ca_lock);

	init_waitqueue_head(&ca->hif_data_wq);
	init_waitqueue_head(&ca->hif_opdone_wq);
	init_waitqueue_head(&ca->hif_write_wq);

	dprintk(MANTIS_ERROR, 1, "Registering EN50221 device");
	result = dvb_ca_en50221_init(dvb_adapter, &ca->en50221, ca_flags, 1);
	if (result != 0) {
		dprintk(MANTIS_ERROR, 1, "EN50221: Initialization failed <%d>", result);
		goto err;
	}
	dprintk(MANTIS_ERROR, 1, "Registered EN50221 device");
	mantis_evmgr_init(ca);
	return 0;
err:
	kfree(ca);
	return result;
}
EXPORT_SYMBOL_GPL(mantis_ca_init);

void mantis_ca_exit(struct mantis_pci *mantis)
{
	struct mantis_ca *ca = mantis->mantis_ca;

	dprintk(MANTIS_DEBUG, 1, "Mantis CA exit");
	if (!ca)
		return;

	mantis_evmgr_exit(ca);
	dprintk(MANTIS_ERROR, 1, "Unregistering EN50221 device");
	dvb_ca_en50221_release(&ca->en50221);

	kfree(ca);
}
EXPORT_SYMBOL_GPL(mantis_ca_exit);