/*
 * Linux driver for digital TV devices equipped with B2C2 FlexcopII(b)/III
 * flexcop.c - main module part
 * Copyright (C) 2004-9 Patrick Boettcher <patrick.boettcher@posteo.de>
 * based on skystar2-driver Copyright (C) 2003 Vadim Catana, skystar@moldova.cc
 *
 * Acknowledgements:
 *   John Jurrius from BBTI, Inc. for extensive support
 *                    with code examples and data books
 *   Bjarne Steinsbo, bjarne at steinsbo.com (some ideas for rewriting)
 *
 * Contributions to the skystar2-driver have been done by
 *   Vincenzo Di Massa, hawk.it at tiscalinet.it (several DiSEqC fixes)
 *   Roberto Ragusa, r.ragusa at libero.it (polishing, restyling the code)
 *   Uwe Bugla, uwe.bugla at gmx.de (doing tests, restyling code, writing docu)
 *   Niklas Peinecke, peinecke at gdv.uni-hannover.de (hardware pid/mac
 *               filtering)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * 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 "flexcop.h"

#define DRIVER_NAME "B2C2 FlexcopII/II(b)/III digital TV receiver chip"
#define DRIVER_AUTHOR "Patrick Boettcher <patrick.boettcher@posteo.de"

#ifdef CONFIG_DVB_B2C2_FLEXCOP_DEBUG
#define DEBSTATUS ""
#else
#define DEBSTATUS " (debugging is not enabled)"
#endif

int b2c2_flexcop_debug;
EXPORT_SYMBOL_GPL(b2c2_flexcop_debug);
module_param_named(debug, b2c2_flexcop_debug,  int, 0644);
MODULE_PARM_DESC(debug,
                "set debug level (1=info,2=tuner,4=i2c,8=ts,16=sram,32=reg,64=i2cdump (|-able))."
                DEBSTATUS);
#undef DEBSTATUS

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

/* global zero for ibi values */
flexcop_ibi_value ibi_zero;

static int flexcop_dvb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
{
        struct flexcop_device *fc = dvbdmxfeed->demux->priv;
        return flexcop_pid_feed_control(fc, dvbdmxfeed, 1);
}

static int flexcop_dvb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
{
        struct flexcop_device *fc = dvbdmxfeed->demux->priv;
        return flexcop_pid_feed_control(fc, dvbdmxfeed, 0);
}

static int flexcop_dvb_init(struct flexcop_device *fc)
{
        int ret = dvb_register_adapter(&fc->dvb_adapter,
                        "FlexCop Digital TV device", fc->owner,
                        fc->dev, adapter_nr);
        if (ret < 0) {
                err("error registering DVB adapter");
                return ret;
        }
        fc->dvb_adapter.priv = fc;

        fc->demux.dmx.capabilities = (DMX_TS_FILTERING | DMX_SECTION_FILTERING
                        | DMX_MEMORY_BASED_FILTERING);
        fc->demux.priv = fc;
        fc->demux.filternum = fc->demux.feednum = FC_MAX_FEED;
        fc->demux.start_feed = flexcop_dvb_start_feed;
        fc->demux.stop_feed = flexcop_dvb_stop_feed;
        fc->demux.write_to_decoder = NULL;

        ret = dvb_dmx_init(&fc->demux);
        if (ret < 0) {
                err("dvb_dmx failed: error %d", ret);
                goto err_dmx;
        }

        fc->hw_frontend.source = DMX_FRONTEND_0;

        fc->dmxdev.filternum = fc->demux.feednum;
        fc->dmxdev.demux = &fc->demux.dmx;
        fc->dmxdev.capabilities = 0;
        ret = dvb_dmxdev_init(&fc->dmxdev, &fc->dvb_adapter);
        if (ret < 0) {
                err("dvb_dmxdev_init failed: error %d", ret);
                goto err_dmx_dev;
        }

        ret = fc->demux.dmx.add_frontend(&fc->demux.dmx, &fc->hw_frontend);
        if (ret < 0) {
                err("adding hw_frontend to dmx failed: error %d", ret);
                goto err_dmx_add_hw_frontend;
        }

        fc->mem_frontend.source = DMX_MEMORY_FE;
        ret = fc->demux.dmx.add_frontend(&fc->demux.dmx, &fc->mem_frontend);
        if (ret < 0) {
                err("adding mem_frontend to dmx failed: error %d", ret);
                goto err_dmx_add_mem_frontend;
        }

        ret = fc->demux.dmx.connect_frontend(&fc->demux.dmx, &fc->hw_frontend);
        if (ret < 0) {
                err("connect frontend failed: error %d", ret);
                goto err_connect_frontend;
        }

        ret = dvb_net_init(&fc->dvb_adapter, &fc->dvbnet, &fc->demux.dmx);
        if (ret < 0) {
                err("dvb_net_init failed: error %d", ret);
                goto err_net;
        }

        fc->init_state |= FC_STATE_DVB_INIT;
        return 0;

err_net:
        fc->demux.dmx.disconnect_frontend(&fc->demux.dmx);
err_connect_frontend:
        fc->demux.dmx.remove_frontend(&fc->demux.dmx, &fc->mem_frontend);
err_dmx_add_mem_frontend:
        fc->demux.dmx.remove_frontend(&fc->demux.dmx, &fc->hw_frontend);
err_dmx_add_hw_frontend:
        dvb_dmxdev_release(&fc->dmxdev);
err_dmx_dev:
        dvb_dmx_release(&fc->demux);
err_dmx:
        dvb_unregister_adapter(&fc->dvb_adapter);
        return ret;
}

static void flexcop_dvb_exit(struct flexcop_device *fc)
{
        if (fc->init_state & FC_STATE_DVB_INIT) {
                dvb_net_release(&fc->dvbnet);

                fc->demux.dmx.close(&fc->demux.dmx);
                fc->demux.dmx.remove_frontend(&fc->demux.dmx,
                        &fc->mem_frontend);
                fc->demux.dmx.remove_frontend(&fc->demux.dmx,
                        &fc->hw_frontend);
                dvb_dmxdev_release(&fc->dmxdev);
                dvb_dmx_release(&fc->demux);
                dvb_unregister_adapter(&fc->dvb_adapter);
                deb_info("deinitialized dvb stuff\n");
        }
        fc->init_state &= ~FC_STATE_DVB_INIT;
}

/* these methods are necessary to achieve the long-term-goal of hiding the
 * struct flexcop_device from the bus-parts */
void flexcop_pass_dmx_data(struct flexcop_device *fc, u8 *buf, u32 len)
{
        dvb_dmx_swfilter(&fc->demux, buf, len);
}
EXPORT_SYMBOL(flexcop_pass_dmx_data);

void flexcop_pass_dmx_packets(struct flexcop_device *fc, u8 *buf, u32 no)
{
        dvb_dmx_swfilter_packets(&fc->demux, buf, no);
}
EXPORT_SYMBOL(flexcop_pass_dmx_packets);

static void flexcop_reset(struct flexcop_device *fc)
{
        flexcop_ibi_value v210, v204;

        /* reset the flexcop itself */
        fc->write_ibi_reg(fc,ctrl_208,ibi_zero);

        v210.raw = 0;
        v210.sw_reset_210.reset_block_000 = 1;
        v210.sw_reset_210.reset_block_100 = 1;
        v210.sw_reset_210.reset_block_200 = 1;
        v210.sw_reset_210.reset_block_300 = 1;
        v210.sw_reset_210.reset_block_400 = 1;
        v210.sw_reset_210.reset_block_500 = 1;
        v210.sw_reset_210.reset_block_600 = 1;
        v210.sw_reset_210.reset_block_700 = 1;
        v210.sw_reset_210.Block_reset_enable = 0xb2;
        v210.sw_reset_210.Special_controls = 0xc259;
        fc->write_ibi_reg(fc,sw_reset_210,v210);
        msleep(1);

        /* reset the periphical devices */

        v204 = fc->read_ibi_reg(fc,misc_204);
        v204.misc_204.Per_reset_sig = 0;
        fc->write_ibi_reg(fc,misc_204,v204);
        msleep(1);
        v204.misc_204.Per_reset_sig = 1;
        fc->write_ibi_reg(fc,misc_204,v204);
}

void flexcop_reset_block_300(struct flexcop_device *fc)
{
        flexcop_ibi_value v208_save = fc->read_ibi_reg(fc, ctrl_208),
                          v210 = fc->read_ibi_reg(fc, sw_reset_210);

        deb_rdump("208: %08x, 210: %08x\n", v208_save.raw, v210.raw);
        fc->write_ibi_reg(fc,ctrl_208,ibi_zero);

        v210.sw_reset_210.reset_block_300 = 1;
        v210.sw_reset_210.Block_reset_enable = 0xb2;

        fc->write_ibi_reg(fc,sw_reset_210,v210);
        fc->write_ibi_reg(fc,ctrl_208,v208_save);
}

struct flexcop_device *flexcop_device_kmalloc(size_t bus_specific_len)
{
        void *bus;
        struct flexcop_device *fc = kzalloc(sizeof(struct flexcop_device),
                                GFP_KERNEL);
        if (!fc) {
                err("no memory");
                return NULL;
        }

        bus = kzalloc(bus_specific_len, GFP_KERNEL);
        if (!bus) {
                err("no memory");
                kfree(fc);
                return NULL;
        }

        fc->bus_specific = bus;

        return fc;
}
EXPORT_SYMBOL(flexcop_device_kmalloc);

void flexcop_device_kfree(struct flexcop_device *fc)
{
        kfree(fc->bus_specific);
        kfree(fc);
}
EXPORT_SYMBOL(flexcop_device_kfree);

int flexcop_device_initialize(struct flexcop_device *fc)
{
        int ret;
        ibi_zero.raw = 0;

        flexcop_reset(fc);
        flexcop_determine_revision(fc);
        flexcop_sram_init(fc);
        flexcop_hw_filter_init(fc);
        flexcop_smc_ctrl(fc, 0);

        ret = flexcop_dvb_init(fc);
        if (ret)
                goto error;

        /* i2c has to be done before doing EEProm stuff -
         * because the EEProm is accessed via i2c */
        ret = flexcop_i2c_init(fc);
        if (ret)
                goto error;

        /* do the MAC address reading after initializing the dvb_adapter */
        if (fc->get_mac_addr(fc, 0) == 0) {
                u8 *b = fc->dvb_adapter.proposed_mac;
                info("MAC address = %pM", b);
                flexcop_set_mac_filter(fc,b);
                flexcop_mac_filter_ctrl(fc,1);
        } else
                warn("reading of MAC address failed.\n");

        ret = flexcop_frontend_init(fc);
        if (ret)
                goto error;

        flexcop_device_name(fc,"initialization of","complete");
        return 0;

error:
        flexcop_device_exit(fc);
        return ret;
}
EXPORT_SYMBOL(flexcop_device_initialize);

void flexcop_device_exit(struct flexcop_device *fc)
{
        flexcop_frontend_exit(fc);
        flexcop_i2c_exit(fc);
        flexcop_dvb_exit(fc);
}
EXPORT_SYMBOL(flexcop_device_exit);

static int flexcop_module_init(void)
{
        info(DRIVER_NAME " loaded successfully");
        return 0;
}

static void flexcop_module_cleanup(void)
{
        info(DRIVER_NAME " unloaded successfully");
}

module_init(flexcop_module_init);
module_exit(flexcop_module_cleanup);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_NAME);
MODULE_LICENSE("GPL");