// 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_obj(struct mantis_ca);
        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);