// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for the NXP SAA7164 PCIe bridge
 *
 *  Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
 */

#include "saa7164.h"

#include "tda10048.h"
#include "tda18271.h"
#include "s5h1411.h"
#include "si2157.h"
#include "si2168.h"
#include "lgdt3306a.h"

#define DRIVER_NAME "saa7164"

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

/* addr is in the card struct, get it from there */
static struct tda10048_config hauppauge_hvr2200_1_config = {
        .demod_address    = 0x10 >> 1,
        .output_mode      = TDA10048_SERIAL_OUTPUT,
        .fwbulkwritelen   = TDA10048_BULKWRITE_200,
        .inversion        = TDA10048_INVERSION_ON,
        .dtv6_if_freq_khz = TDA10048_IF_3300,
        .dtv7_if_freq_khz = TDA10048_IF_3500,
        .dtv8_if_freq_khz = TDA10048_IF_4000,
        .clk_freq_khz     = TDA10048_CLK_16000,
};
static struct tda10048_config hauppauge_hvr2200_2_config = {
        .demod_address    = 0x12 >> 1,
        .output_mode      = TDA10048_SERIAL_OUTPUT,
        .fwbulkwritelen   = TDA10048_BULKWRITE_200,
        .inversion        = TDA10048_INVERSION_ON,
        .dtv6_if_freq_khz = TDA10048_IF_3300,
        .dtv7_if_freq_khz = TDA10048_IF_3500,
        .dtv8_if_freq_khz = TDA10048_IF_4000,
        .clk_freq_khz     = TDA10048_CLK_16000,
};

static struct tda18271_std_map hauppauge_tda18271_std_map = {
        .atsc_6   = { .if_freq = 3250, .agc_mode = 3, .std = 3,
                      .if_lvl = 6, .rfagc_top = 0x37 },
        .qam_6    = { .if_freq = 4000, .agc_mode = 3, .std = 0,
                      .if_lvl = 6, .rfagc_top = 0x37 },
};

static struct tda18271_config hauppauge_hvr22x0_tuner_config = {
        .std_map        = &hauppauge_tda18271_std_map,
        .gate           = TDA18271_GATE_ANALOG,
        .role           = TDA18271_MASTER,
};

static struct tda18271_config hauppauge_hvr22x0s_tuner_config = {
        .std_map        = &hauppauge_tda18271_std_map,
        .gate           = TDA18271_GATE_ANALOG,
        .role           = TDA18271_SLAVE,
        .output_opt     = TDA18271_OUTPUT_LT_OFF,
        .rf_cal_on_startup = 1
};

static struct s5h1411_config hauppauge_s5h1411_config = {
        .output_mode   = S5H1411_SERIAL_OUTPUT,
        .gpio          = S5H1411_GPIO_ON,
        .qam_if        = S5H1411_IF_4000,
        .vsb_if        = S5H1411_IF_3250,
        .inversion     = S5H1411_INVERSION_ON,
        .status_mode   = S5H1411_DEMODLOCKING,
        .mpeg_timing   = S5H1411_MPEGTIMING_CONTINUOUS_NONINVERTING_CLOCK,
};

static struct lgdt3306a_config hauppauge_hvr2255a_config = {
        .i2c_addr               = 0xb2 >> 1,
        .qam_if_khz             = 4000,
        .vsb_if_khz             = 3250,
        .deny_i2c_rptr          = 1, /* Disabled */
        .spectral_inversion     = 0, /* Disabled */
        .mpeg_mode              = LGDT3306A_MPEG_SERIAL,
        .tpclk_edge             = LGDT3306A_TPCLK_RISING_EDGE,
        .tpvalid_polarity       = LGDT3306A_TP_VALID_HIGH,
        .xtalMHz                = 25, /* 24 or 25 */
};

static struct lgdt3306a_config hauppauge_hvr2255b_config = {
        .i2c_addr               = 0x1c >> 1,
        .qam_if_khz             = 4000,
        .vsb_if_khz             = 3250,
        .deny_i2c_rptr          = 1, /* Disabled */
        .spectral_inversion     = 0, /* Disabled */
        .mpeg_mode              = LGDT3306A_MPEG_SERIAL,
        .tpclk_edge             = LGDT3306A_TPCLK_RISING_EDGE,
        .tpvalid_polarity       = LGDT3306A_TP_VALID_HIGH,
        .xtalMHz                = 25, /* 24 or 25 */
};

static struct si2157_config hauppauge_hvr2255_tuner_config = {
        .inversion = 1,
        .if_port = 1,
};

static int si2157_attach(struct saa7164_port *port, struct i2c_adapter *adapter,
        struct dvb_frontend *fe, u8 addr8bit, struct si2157_config *cfg)
{
        struct i2c_board_info bi;
        struct i2c_client *tuner;

        cfg->fe = fe;

        memset(&bi, 0, sizeof(bi));

        strscpy(bi.type, "si2157", I2C_NAME_SIZE);
        bi.platform_data = cfg;
        bi.addr = addr8bit >> 1;

        request_module(bi.type);

        tuner = i2c_new_client_device(adapter, &bi);
        if (!i2c_client_has_driver(tuner))
                return -ENODEV;

        if (!try_module_get(tuner->dev.driver->owner)) {
                i2c_unregister_device(tuner);
                return -ENODEV;
        }

        port->i2c_client_tuner = tuner;

        return 0;
}

static int saa7164_dvb_stop_port(struct saa7164_port *port)
{
        struct saa7164_dev *dev = port->dev;
        int ret;

        ret = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
        if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
                printk(KERN_ERR "%s() stop transition failed, ret = 0x%x\n",
                        __func__, ret);
                ret = -EIO;
        } else {
                dprintk(DBGLVL_DVB, "%s()    Stopped\n", __func__);
                ret = 0;
        }

        return ret;
}

static int saa7164_dvb_acquire_port(struct saa7164_port *port)
{
        struct saa7164_dev *dev = port->dev;
        int ret;

        ret = saa7164_api_transition_port(port, SAA_DMASTATE_ACQUIRE);
        if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
                printk(KERN_ERR "%s() acquire transition failed, ret = 0x%x\n",
                        __func__, ret);
                ret = -EIO;
        } else {
                dprintk(DBGLVL_DVB, "%s() Acquired\n", __func__);
                ret = 0;
        }

        return ret;
}

static int saa7164_dvb_pause_port(struct saa7164_port *port)
{
        struct saa7164_dev *dev = port->dev;
        int ret;

        ret = saa7164_api_transition_port(port, SAA_DMASTATE_PAUSE);
        if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
                printk(KERN_ERR "%s() pause transition failed, ret = 0x%x\n",
                        __func__, ret);
                ret = -EIO;
        } else {
                dprintk(DBGLVL_DVB, "%s()   Paused\n", __func__);
                ret = 0;
        }

        return ret;
}

/* Firmware is very windows centric, meaning you have to transition
 * the part through AVStream / KS Windows stages, forwards or backwards.
 * States are: stopped, acquired (h/w), paused, started.
 */
static int saa7164_dvb_stop_streaming(struct saa7164_port *port)
{
        struct saa7164_dev *dev = port->dev;
        struct saa7164_buffer *buf;
        struct list_head *p, *q;
        int ret;

        dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);

        ret = saa7164_dvb_pause_port(port);
        ret = saa7164_dvb_acquire_port(port);
        ret = saa7164_dvb_stop_port(port);

        /* Mark the hardware buffers as free */
        mutex_lock(&port->dmaqueue_lock);
        list_for_each_safe(p, q, &port->dmaqueue.list) {
                buf = list_entry(p, struct saa7164_buffer, list);
                buf->flags = SAA7164_BUFFER_FREE;
        }
        mutex_unlock(&port->dmaqueue_lock);

        return ret;
}

static int saa7164_dvb_start_port(struct saa7164_port *port)
{
        struct saa7164_dev *dev = port->dev;
        int ret = 0, result;

        dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);

        saa7164_buffer_cfg_port(port);

        /* Acquire the hardware */
        result = saa7164_api_transition_port(port, SAA_DMASTATE_ACQUIRE);
        if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
                printk(KERN_ERR "%s() acquire transition failed, res = 0x%x\n",
                        __func__, result);

                /* Stop the hardware, regardless */
                result = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
                if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
                        printk(KERN_ERR "%s() acquire/forced stop transition failed, res = 0x%x\n",
                               __func__, result);
                }
                ret = -EIO;
                goto out;
        } else
                dprintk(DBGLVL_DVB, "%s()   Acquired\n", __func__);

        /* Pause the hardware */
        result = saa7164_api_transition_port(port, SAA_DMASTATE_PAUSE);
        if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
                printk(KERN_ERR "%s() pause transition failed, res = 0x%x\n",
                                __func__, result);

                /* Stop the hardware, regardless */
                result = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
                if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
                        printk(KERN_ERR "%s() pause/forced stop transition failed, res = 0x%x\n",
                               __func__, result);
                }

                ret = -EIO;
                goto out;
        } else
                dprintk(DBGLVL_DVB, "%s()   Paused\n", __func__);

        /* Start the hardware */
        result = saa7164_api_transition_port(port, SAA_DMASTATE_RUN);
        if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
                printk(KERN_ERR "%s() run transition failed, result = 0x%x\n",
                                __func__, result);

                /* Stop the hardware, regardless */
                result = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
                if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
                        printk(KERN_ERR "%s() run/forced stop transition failed, res = 0x%x\n",
                               __func__, result);
                }

                ret = -EIO;
        } else
                dprintk(DBGLVL_DVB, "%s()   Running\n", __func__);

out:
        return ret;
}

static int saa7164_dvb_start_feed(struct dvb_demux_feed *feed)
{
        struct dvb_demux *demux = feed->demux;
        struct saa7164_port *port = demux->priv;
        struct saa7164_dvb *dvb = &port->dvb;
        struct saa7164_dev *dev = port->dev;
        int ret = 0;

        dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);

        if (!demux->dmx.frontend)
                return -EINVAL;

        if (dvb) {
                mutex_lock(&dvb->lock);
                if (dvb->feeding++ == 0) {
                        /* Start transport */
                        ret = saa7164_dvb_start_port(port);
                }
                mutex_unlock(&dvb->lock);
                dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
                        __func__, port->nr, dvb->feeding);
        }

        return ret;
}

static int saa7164_dvb_stop_feed(struct dvb_demux_feed *feed)
{
        struct dvb_demux *demux = feed->demux;
        struct saa7164_port *port = demux->priv;
        struct saa7164_dvb *dvb = &port->dvb;
        struct saa7164_dev *dev = port->dev;
        int ret = 0;

        dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);

        if (dvb) {
                mutex_lock(&dvb->lock);
                if (--dvb->feeding == 0) {
                        /* Stop transport */
                        ret = saa7164_dvb_stop_streaming(port);
                }
                mutex_unlock(&dvb->lock);
                dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
                        __func__, port->nr, dvb->feeding);
        }

        return ret;
}

static int dvb_register(struct saa7164_port *port)
{
        struct saa7164_dvb *dvb = &port->dvb;
        struct saa7164_dev *dev = port->dev;
        struct saa7164_buffer *buf;
        int result, i;

        dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);

        BUG_ON(port->type != SAA7164_MPEG_DVB);

        /* Sanity check that the PCI configuration space is active */
        if (port->hwcfg.BARLocation == 0) {
                result = -ENOMEM;
                printk(KERN_ERR "%s: dvb_register_adapter failed (errno = %d), NO PCI configuration\n",
                        DRIVER_NAME, result);
                goto fail_adapter;
        }

        /* Init and establish defaults */
        port->hw_streamingparams.bitspersample = 8;
        port->hw_streamingparams.samplesperline = 188;
        port->hw_streamingparams.numberoflines =
                (SAA7164_TS_NUMBER_OF_LINES * 188) / 188;

        port->hw_streamingparams.pitch = 188;
        port->hw_streamingparams.linethreshold = 0;
        port->hw_streamingparams.pagetablelistvirt = NULL;
        port->hw_streamingparams.pagetablelistphys = NULL;
        port->hw_streamingparams.numpagetables = 2 +
                ((SAA7164_TS_NUMBER_OF_LINES * 188) / PAGE_SIZE);

        port->hw_streamingparams.numpagetableentries = port->hwcfg.buffercount;

        /* Allocate the PCI resources */
        for (i = 0; i < port->hwcfg.buffercount; i++) {
                buf = saa7164_buffer_alloc(port,
                        port->hw_streamingparams.numberoflines *
                        port->hw_streamingparams.pitch);

                if (!buf) {
                        result = -ENOMEM;
                        printk(KERN_ERR "%s: dvb_register_adapter failed (errno = %d), unable to allocate buffers\n",
                                DRIVER_NAME, result);
                        goto fail_adapter;
                }

                mutex_lock(&port->dmaqueue_lock);
                list_add_tail(&buf->list, &port->dmaqueue.list);
                mutex_unlock(&port->dmaqueue_lock);
        }

        /* register adapter */
        result = dvb_register_adapter(&dvb->adapter, DRIVER_NAME, THIS_MODULE,
                        &dev->pci->dev, adapter_nr);
        if (result < 0) {
                printk(KERN_ERR "%s: dvb_register_adapter failed (errno = %d)\n",
                       DRIVER_NAME, result);
                goto fail_adapter;
        }
        dvb->adapter.priv = port;

        /* register frontend */
        result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
        if (result < 0) {
                printk(KERN_ERR "%s: dvb_register_frontend failed (errno = %d)\n",
                       DRIVER_NAME, result);
                goto fail_frontend;
        }

        /* register demux stuff */
        dvb->demux.dmx.capabilities =
                DMX_TS_FILTERING | DMX_SECTION_FILTERING |
                DMX_MEMORY_BASED_FILTERING;
        dvb->demux.priv       = port;
        dvb->demux.filternum  = 256;
        dvb->demux.feednum    = 256;
        dvb->demux.start_feed = saa7164_dvb_start_feed;
        dvb->demux.stop_feed  = saa7164_dvb_stop_feed;
        result = dvb_dmx_init(&dvb->demux);
        if (result < 0) {
                printk(KERN_ERR "%s: dvb_dmx_init failed (errno = %d)\n",
                       DRIVER_NAME, result);
                goto fail_dmx;
        }

        dvb->dmxdev.filternum    = 256;
        dvb->dmxdev.demux        = &dvb->demux.dmx;
        dvb->dmxdev.capabilities = 0;
        result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
        if (result < 0) {
                printk(KERN_ERR "%s: dvb_dmxdev_init failed (errno = %d)\n",
                       DRIVER_NAME, result);
                goto fail_dmxdev;
        }

        dvb->fe_hw.source = DMX_FRONTEND_0;
        result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
        if (result < 0) {
                printk(KERN_ERR "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
                       DRIVER_NAME, result);
                goto fail_fe_hw;
        }

        dvb->fe_mem.source = DMX_MEMORY_FE;
        result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
        if (result < 0) {
                printk(KERN_ERR "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
                       DRIVER_NAME, result);
                goto fail_fe_mem;
        }

        result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
        if (result < 0) {
                printk(KERN_ERR "%s: connect_frontend failed (errno = %d)\n",
                       DRIVER_NAME, result);
                goto fail_fe_conn;
        }

        /* register network adapter */
        dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
        return 0;

fail_fe_conn:
        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
fail_fe_mem:
        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
fail_fe_hw:
        dvb_dmxdev_release(&dvb->dmxdev);
fail_dmxdev:
        dvb_dmx_release(&dvb->demux);
fail_dmx:
        dvb_unregister_frontend(dvb->frontend);
fail_frontend:
        dvb_frontend_detach(dvb->frontend);
        dvb_unregister_adapter(&dvb->adapter);
fail_adapter:
        return result;
}

int saa7164_dvb_unregister(struct saa7164_port *port)
{
        struct saa7164_dvb *dvb = &port->dvb;
        struct saa7164_dev *dev = port->dev;
        struct saa7164_buffer *b;
        struct list_head *c, *n;
        struct i2c_client *client;

        dprintk(DBGLVL_DVB, "%s()\n", __func__);

        BUG_ON(port->type != SAA7164_MPEG_DVB);

        /* Remove any allocated buffers */
        mutex_lock(&port->dmaqueue_lock);
        list_for_each_safe(c, n, &port->dmaqueue.list) {
                b = list_entry(c, struct saa7164_buffer, list);
                list_del(c);
                saa7164_buffer_dealloc(b);
        }
        mutex_unlock(&port->dmaqueue_lock);

        if (dvb->frontend == NULL)
                return 0;

        /* remove I2C client for tuner */
        client = port->i2c_client_tuner;
        if (client) {
                module_put(client->dev.driver->owner);
                i2c_unregister_device(client);
        }

        /* remove I2C client for demodulator */
        client = port->i2c_client_demod;
        if (client) {
                module_put(client->dev.driver->owner);
                i2c_unregister_device(client);
        }

        dvb_net_release(&dvb->net);
        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
        dvb_dmxdev_release(&dvb->dmxdev);
        dvb_dmx_release(&dvb->demux);
        dvb_unregister_frontend(dvb->frontend);
        dvb_frontend_detach(dvb->frontend);
        dvb_unregister_adapter(&dvb->adapter);
        return 0;
}

/* All the DVB attach calls go here, this function gets modified
 * for each new card.
 */
int saa7164_dvb_register(struct saa7164_port *port)
{
        struct saa7164_dev *dev = port->dev;
        struct saa7164_dvb *dvb = &port->dvb;
        struct saa7164_i2c *i2c_bus = NULL;
        struct si2168_config si2168_config;
        struct si2157_config si2157_config;
        struct i2c_adapter *adapter;
        struct i2c_board_info info;
        struct i2c_client *client_demod;
        struct i2c_client *client_tuner;
        int ret;

        dprintk(DBGLVL_DVB, "%s()\n", __func__);

        /* init frontend */
        switch (dev->board) {
        case SAA7164_BOARD_HAUPPAUGE_HVR2200:
        case SAA7164_BOARD_HAUPPAUGE_HVR2200_2:
        case SAA7164_BOARD_HAUPPAUGE_HVR2200_3:
        case SAA7164_BOARD_HAUPPAUGE_HVR2200_4:
        case SAA7164_BOARD_HAUPPAUGE_HVR2200_5:
                i2c_bus = &dev->i2c_bus[port->nr + 1];
                switch (port->nr) {
                case 0:
                        port->dvb.frontend = dvb_attach(tda10048_attach,
                                &hauppauge_hvr2200_1_config,
                                &i2c_bus->i2c_adap);

                        if (port->dvb.frontend != NULL) {
                                /* TODO: addr is in the card struct */
                                dvb_attach(tda18271_attach, port->dvb.frontend,
                                        0xc0 >> 1, &i2c_bus->i2c_adap,
                                        &hauppauge_hvr22x0_tuner_config);
                        }

                        break;
                case 1:
                        port->dvb.frontend = dvb_attach(tda10048_attach,
                                &hauppauge_hvr2200_2_config,
                                &i2c_bus->i2c_adap);

                        if (port->dvb.frontend != NULL) {
                                /* TODO: addr is in the card struct */
                                dvb_attach(tda18271_attach, port->dvb.frontend,
                                        0xc0 >> 1, &i2c_bus->i2c_adap,
                                        &hauppauge_hvr22x0s_tuner_config);
                        }

                        break;
                }
                break;
        case SAA7164_BOARD_HAUPPAUGE_HVR2250:
        case SAA7164_BOARD_HAUPPAUGE_HVR2250_2:
        case SAA7164_BOARD_HAUPPAUGE_HVR2250_3:
                i2c_bus = &dev->i2c_bus[port->nr + 1];

                port->dvb.frontend = dvb_attach(s5h1411_attach,
                        &hauppauge_s5h1411_config,
                        &i2c_bus->i2c_adap);

                if (port->dvb.frontend != NULL) {
                        if (port->nr == 0) {
                                /* Master TDA18271 */
                                /* TODO: addr is in the card struct */
                                dvb_attach(tda18271_attach, port->dvb.frontend,
                                        0xc0 >> 1, &i2c_bus->i2c_adap,
                                        &hauppauge_hvr22x0_tuner_config);
                        } else {
                                /* Slave TDA18271 */
                                dvb_attach(tda18271_attach, port->dvb.frontend,
                                        0xc0 >> 1, &i2c_bus->i2c_adap,
                                        &hauppauge_hvr22x0s_tuner_config);
                        }
                }

                break;
        case SAA7164_BOARD_HAUPPAUGE_HVR2255proto:
        case SAA7164_BOARD_HAUPPAUGE_HVR2255:
                i2c_bus = &dev->i2c_bus[2];

                if (port->nr == 0) {
                        port->dvb.frontend = dvb_attach(lgdt3306a_attach,
                                &hauppauge_hvr2255a_config, &i2c_bus->i2c_adap);
                } else {
                        port->dvb.frontend = dvb_attach(lgdt3306a_attach,
                                &hauppauge_hvr2255b_config, &i2c_bus->i2c_adap);
                }

                if (port->dvb.frontend != NULL) {

                        if (port->nr == 0) {
                                si2157_attach(port, &dev->i2c_bus[0].i2c_adap,
                                              port->dvb.frontend, 0xc0,
                                              &hauppauge_hvr2255_tuner_config);
                        } else {
                                si2157_attach(port, &dev->i2c_bus[1].i2c_adap,
                                              port->dvb.frontend, 0xc0,
                                              &hauppauge_hvr2255_tuner_config);
                        }
                }
                break;
        case SAA7164_BOARD_HAUPPAUGE_HVR2205:

                if (port->nr == 0) {
                        /* attach frontend */
                        memset(&si2168_config, 0, sizeof(si2168_config));
                        si2168_config.i2c_adapter = &adapter;
                        si2168_config.fe = &port->dvb.frontend;
                        si2168_config.ts_mode = SI2168_TS_SERIAL;
                        memset(&info, 0, sizeof(struct i2c_board_info));
                        strscpy(info.type, "si2168", I2C_NAME_SIZE);
                        info.addr = 0xc8 >> 1;
                        info.platform_data = &si2168_config;
                        request_module(info.type);
                        client_demod = i2c_new_client_device(&dev->i2c_bus[2].i2c_adap, &info);
                        if (!i2c_client_has_driver(client_demod))
                                goto frontend_detach;

                        if (!try_module_get(client_demod->dev.driver->owner)) {
                                i2c_unregister_device(client_demod);
                                goto frontend_detach;
                        }
                        port->i2c_client_demod = client_demod;

                        /* attach tuner */
                        memset(&si2157_config, 0, sizeof(si2157_config));
                        si2157_config.if_port = 1;
                        si2157_config.fe = port->dvb.frontend;
                        memset(&info, 0, sizeof(struct i2c_board_info));
                        strscpy(info.type, "si2157", I2C_NAME_SIZE);
                        info.addr = 0xc0 >> 1;
                        info.platform_data = &si2157_config;
                        request_module(info.type);
                        client_tuner = i2c_new_client_device(&dev->i2c_bus[0].i2c_adap, &info);
                        if (!i2c_client_has_driver(client_tuner)) {
                                module_put(client_demod->dev.driver->owner);
                                i2c_unregister_device(client_demod);
                                goto frontend_detach;
                        }
                        if (!try_module_get(client_tuner->dev.driver->owner)) {
                                i2c_unregister_device(client_tuner);
                                module_put(client_demod->dev.driver->owner);
                                i2c_unregister_device(client_demod);
                                goto frontend_detach;
                        }
                        port->i2c_client_tuner = client_tuner;
                } else {
                        /* attach frontend */
                        memset(&si2168_config, 0, sizeof(si2168_config));
                        si2168_config.i2c_adapter = &adapter;
                        si2168_config.fe = &port->dvb.frontend;
                        si2168_config.ts_mode = SI2168_TS_SERIAL;
                        memset(&info, 0, sizeof(struct i2c_board_info));
                        strscpy(info.type, "si2168", I2C_NAME_SIZE);
                        info.addr = 0xcc >> 1;
                        info.platform_data = &si2168_config;
                        request_module(info.type);
                        client_demod = i2c_new_client_device(&dev->i2c_bus[2].i2c_adap, &info);
                        if (!i2c_client_has_driver(client_demod))
                                goto frontend_detach;

                        if (!try_module_get(client_demod->dev.driver->owner)) {
                                i2c_unregister_device(client_demod);
                                goto frontend_detach;
                        }
                        port->i2c_client_demod = client_demod;

                        /* attach tuner */
                        memset(&si2157_config, 0, sizeof(si2157_config));
                        si2157_config.fe = port->dvb.frontend;
                        si2157_config.if_port = 1;
                        memset(&info, 0, sizeof(struct i2c_board_info));
                        strscpy(info.type, "si2157", I2C_NAME_SIZE);
                        info.addr = 0xc0 >> 1;
                        info.platform_data = &si2157_config;
                        request_module(info.type);
                        client_tuner = i2c_new_client_device(&dev->i2c_bus[1].i2c_adap, &info);
                        if (!i2c_client_has_driver(client_tuner)) {
                                module_put(client_demod->dev.driver->owner);
                                i2c_unregister_device(client_demod);
                                goto frontend_detach;
                        }
                        if (!try_module_get(client_tuner->dev.driver->owner)) {
                                i2c_unregister_device(client_tuner);
                                module_put(client_demod->dev.driver->owner);
                                i2c_unregister_device(client_demod);
                                goto frontend_detach;
                        }
                        port->i2c_client_tuner = client_tuner;
                }

                break;
        default:
                printk(KERN_ERR "%s: The frontend isn't supported\n",
                       dev->name);
                break;
        }
        if (NULL == dvb->frontend) {
                printk(KERN_ERR "%s() Frontend initialization failed\n",
                       __func__);
                return -1;
        }

        /* register everything */
        ret = dvb_register(port);
        if (ret < 0) {
                if (dvb->frontend->ops.release)
                        dvb->frontend->ops.release(dvb->frontend);
                return ret;
        }

        return 0;

frontend_detach:
        printk(KERN_ERR "%s() Frontend/I2C initialization failed\n", __func__);
        return -1;
}