// SPDX-License-Identifier: GPL-2.0
//
// DVB device driver for em28xx
//
// (c) 2008-2011 Mauro Carvalho Chehab <mchehab@kernel.org>
//
// (c) 2008 Devin Heitmueller <devin.heitmueller@gmail.com>
//      - Fixes for the driver to properly work with HVR-950
//      - Fixes for the driver to properly work with Pinnacle PCTV HD Pro Stick
//      - Fixes for the driver to properly work with AMD ATI TV Wonder HD 600
//
// (c) 2008 Aidan Thornton <makosoft@googlemail.com>
//
// (c) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
//
// Based on cx88-dvb, saa7134-dvb and videobuf-dvb originally written by:
//      (c) 2004, 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
//      (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]

#include "em28xx.h"

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include <media/v4l2-common.h>
#include <media/dvb_demux.h>
#include <media/dvb_net.h>
#include <media/dmxdev.h>
#include <media/tuner.h>
#include "tuner-simple.h"
#include <linux/gpio.h>

#include "lgdt330x.h"
#include "lgdt3305.h"
#include "lgdt3306a.h"
#include "zl10353.h"
#include "s5h1409.h"
#include "mt2060.h"
#include "mt352.h"
#include "mt352_priv.h" /* FIXME */
#include "tda1002x.h"
#include "drx39xyj/drx39xxj.h"
#include "tda18271.h"
#include "s921.h"
#include "drxd.h"
#include "cxd2820r.h"
#include "tda18271c2dd.h"
#include "drxk.h"
#include "tda10071.h"
#include "tda18212.h"
#include "a8293.h"
#include "qt1010.h"
#include "mb86a20s.h"
#include "m88ds3103.h"
#include "ts2020.h"
#include "si2168.h"
#include "si2157.h"
#include "tc90522.h"
#include "qm1d1c0042.h"
#include "mxl692.h"

MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION(DRIVER_DESC " - digital TV interface");
MODULE_VERSION(EM28XX_VERSION);

static unsigned int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "enable debug messages [dvb]");

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

#define dprintk(level, fmt, arg...) do {                                \
        if (debug >= level)                                             \
                dev_printk(KERN_DEBUG, &dev->intf->dev,                 \
                           "dvb: " fmt, ## arg);                        \
} while (0)

struct em28xx_dvb {
        struct dvb_frontend        *fe[2];

        /* feed count management */
        struct mutex               lock;
        int                        nfeeds;

        /* general boilerplate stuff */
        struct dvb_adapter         adapter;
        struct dvb_demux           demux;
        struct dmxdev              dmxdev;
        struct dmx_frontend        fe_hw;
        struct dmx_frontend        fe_mem;
        struct dvb_net             net;

        /* Due to DRX-K - probably need changes */
        int (*gate_ctrl)(struct dvb_frontend *fe, int gate);
        struct semaphore      pll_mutex;
        bool                    dont_attach_fe1;
        int                     lna_gpio;
        struct i2c_client       *i2c_client_demod;
        struct i2c_client       *i2c_client_tuner;
        struct i2c_client       *i2c_client_sec;
};

static inline void print_err_status(struct em28xx *dev,
                                    int packet, int status)
{
        char *errmsg = "Unknown";

        switch (status) {
        case -ENOENT:
                errmsg = "unlinked synchronously";
                break;
        case -ECONNRESET:
                errmsg = "unlinked asynchronously";
                break;
        case -ENOSR:
                errmsg = "Buffer error (overrun)";
                break;
        case -EPIPE:
                errmsg = "Stalled (device not responding)";
                break;
        case -EOVERFLOW:
                errmsg = "Babble (bad cable?)";
                break;
        case -EPROTO:
                errmsg = "Bit-stuff error (bad cable?)";
                break;
        case -EILSEQ:
                errmsg = "CRC/Timeout (could be anything)";
                break;
        case -ETIME:
                errmsg = "Device does not respond";
                break;
        }
        if (packet < 0) {
                dprintk(1, "URB status %d [%s].\n", status, errmsg);
        } else {
                dprintk(1, "URB packet %d, status %d [%s].\n",
                        packet, status, errmsg);
        }
}

static inline int em28xx_dvb_urb_data_copy(struct em28xx *dev, struct urb *urb)
{
        int xfer_bulk, num_packets, i;

        if (!dev)
                return 0;

        if (dev->disconnected)
                return 0;

        if (urb->status < 0)
                print_err_status(dev, -1, urb->status);

        xfer_bulk = usb_pipebulk(urb->pipe);

        if (xfer_bulk) /* bulk */
                num_packets = 1;
        else /* isoc */
                num_packets = urb->number_of_packets;

        for (i = 0; i < num_packets; i++) {
                if (xfer_bulk) {
                        if (urb->status < 0) {
                                print_err_status(dev, i, urb->status);
                                if (urb->status != -EPROTO)
                                        continue;
                        }
                        if (!urb->actual_length)
                                continue;
                        dvb_dmx_swfilter(&dev->dvb->demux, urb->transfer_buffer,
                                         urb->actual_length);
                } else {
                        if (urb->iso_frame_desc[i].status < 0) {
                                print_err_status(dev, i,
                                                 urb->iso_frame_desc[i].status);
                                if (urb->iso_frame_desc[i].status != -EPROTO)
                                        continue;
                        }
                        if (!urb->iso_frame_desc[i].actual_length)
                                continue;
                        dvb_dmx_swfilter(&dev->dvb->demux,
                                         urb->transfer_buffer +
                                         urb->iso_frame_desc[i].offset,
                                         urb->iso_frame_desc[i].actual_length);
                }
        }

        return 0;
}

static int em28xx_start_streaming(struct em28xx_dvb *dvb)
{
        int rc;
        struct em28xx_i2c_bus *i2c_bus = dvb->adapter.priv;
        struct em28xx *dev = i2c_bus->dev;
        struct usb_device *udev = interface_to_usbdev(dev->intf);
        int dvb_max_packet_size, packet_multiplier, dvb_alt;

        if (dev->dvb_xfer_bulk) {
                if (!dev->dvb_ep_bulk)
                        return -ENODEV;
                dvb_max_packet_size = 512; /* USB 2.0 spec */
                packet_multiplier = EM28XX_DVB_BULK_PACKET_MULTIPLIER;
                dvb_alt = 0;
        } else { /* isoc */
                if (!dev->dvb_ep_isoc)
                        return -ENODEV;
                dvb_max_packet_size = dev->dvb_max_pkt_size_isoc;
                if (dvb_max_packet_size < 0)
                        return dvb_max_packet_size;
                packet_multiplier = EM28XX_DVB_NUM_ISOC_PACKETS;
                dvb_alt = dev->dvb_alt_isoc;
        }

        if (!dev->board.has_dual_ts)
                usb_set_interface(udev, dev->ifnum, dvb_alt);

        rc = em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
        if (rc < 0)
                return rc;

        dprintk(1, "Using %d buffers each with %d x %d bytes, alternate %d\n",
                EM28XX_DVB_NUM_BUFS,
                packet_multiplier,
                dvb_max_packet_size, dvb_alt);

        return em28xx_init_usb_xfer(dev, EM28XX_DIGITAL_MODE,
                                    dev->dvb_xfer_bulk,
                                    EM28XX_DVB_NUM_BUFS,
                                    dvb_max_packet_size,
                                    packet_multiplier,
                                    em28xx_dvb_urb_data_copy);
}

static int em28xx_stop_streaming(struct em28xx_dvb *dvb)
{
        struct em28xx_i2c_bus *i2c_bus = dvb->adapter.priv;
        struct em28xx *dev = i2c_bus->dev;

        em28xx_stop_urbs(dev);

        return 0;
}

static int em28xx_start_feed(struct dvb_demux_feed *feed)
{
        struct dvb_demux *demux  = feed->demux;
        struct em28xx_dvb *dvb = demux->priv;
        int rc, ret;

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

        mutex_lock(&dvb->lock);
        dvb->nfeeds++;
        rc = dvb->nfeeds;

        if (dvb->nfeeds == 1) {
                ret = em28xx_start_streaming(dvb);
                if (ret < 0)
                        rc = ret;
        }

        mutex_unlock(&dvb->lock);
        return rc;
}

static int em28xx_stop_feed(struct dvb_demux_feed *feed)
{
        struct dvb_demux *demux  = feed->demux;
        struct em28xx_dvb *dvb = demux->priv;
        int err = 0;

        mutex_lock(&dvb->lock);
        dvb->nfeeds--;

        if (!dvb->nfeeds)
                err = em28xx_stop_streaming(dvb);

        mutex_unlock(&dvb->lock);
        return err;
}

/* ------------------------------------------------------------------ */
static int em28xx_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
{
        struct em28xx_i2c_bus *i2c_bus = fe->dvb->priv;
        struct em28xx *dev = i2c_bus->dev;

        if (acquire)
                return em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
        else
                return em28xx_set_mode(dev, EM28XX_SUSPEND);
}

/* ------------------------------------------------------------------ */

static struct lgdt330x_config em2880_lgdt3303_dev = {
        .demod_chip = LGDT3303,
};

static struct lgdt3305_config em2870_lgdt3304_dev = {
        .i2c_addr           = 0x0e,
        .demod_chip         = LGDT3304,
        .spectral_inversion = 1,
        .deny_i2c_rptr      = 1,
        .mpeg_mode          = LGDT3305_MPEG_PARALLEL,
        .tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
        .tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
        .vsb_if_khz         = 3250,
        .qam_if_khz         = 4000,
};

static struct lgdt3305_config em2874_lgdt3305_dev = {
        .i2c_addr           = 0x0e,
        .demod_chip         = LGDT3305,
        .spectral_inversion = 1,
        .deny_i2c_rptr      = 0,
        .mpeg_mode          = LGDT3305_MPEG_SERIAL,
        .tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
        .tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
        .vsb_if_khz         = 3250,
        .qam_if_khz         = 4000,
};

static struct lgdt3305_config em2874_lgdt3305_nogate_dev = {
        .i2c_addr           = 0x0e,
        .demod_chip         = LGDT3305,
        .spectral_inversion = 1,
        .deny_i2c_rptr      = 1,
        .mpeg_mode          = LGDT3305_MPEG_SERIAL,
        .tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
        .tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
        .vsb_if_khz         = 3600,
        .qam_if_khz         = 3600,
};

static struct s921_config sharp_isdbt = {
        .demod_address = 0x30 >> 1
};

static struct zl10353_config em28xx_zl10353_with_xc3028 = {
        .demod_address = (0x1e >> 1),
        .no_tuner = 1,
        .parallel_ts = 1,
        .if2 = 45600,
};

static struct s5h1409_config em28xx_s5h1409_with_xc3028 = {
        .demod_address = 0x32 >> 1,
        .output_mode   = S5H1409_PARALLEL_OUTPUT,
        .gpio          = S5H1409_GPIO_OFF,
        .inversion     = S5H1409_INVERSION_OFF,
        .status_mode   = S5H1409_DEMODLOCKING,
        .mpeg_timing   = S5H1409_MPEGTIMING_CONTINUOUS_NONINVERTING_CLOCK
};

static struct tda18271_std_map kworld_a340_std_map = {
        .atsc_6   = { .if_freq = 3250, .agc_mode = 3, .std = 0,
                      .if_lvl = 1, .rfagc_top = 0x37, },
        .qam_6    = { .if_freq = 4000, .agc_mode = 3, .std = 1,
                      .if_lvl = 1, .rfagc_top = 0x37, },
};

static struct tda18271_config kworld_a340_config = {
        .std_map           = &kworld_a340_std_map,
};

static struct tda18271_config kworld_ub435q_v2_config = {
        .std_map        = &kworld_a340_std_map,
        .gate           = TDA18271_GATE_DIGITAL,
};

static struct tda18212_config kworld_ub435q_v3_config = {
        .if_atsc_vsb    = 3600,
        .if_atsc_qam    = 3600,
};

static struct zl10353_config em28xx_zl10353_xc3028_no_i2c_gate = {
        .demod_address = (0x1e >> 1),
        .no_tuner = 1,
        .disable_i2c_gate_ctrl = 1,
        .parallel_ts = 1,
        .if2 = 45600,
};

static struct drxd_config em28xx_drxd = {
        .demod_address = 0x70,
        .demod_revision = 0xa2,
        .pll_type = DRXD_PLL_NONE,
        .clock = 12000,
        .insert_rs_byte = 1,
        .IF = 42800000,
        .disable_i2c_gate_ctrl = 1,
};

static struct drxk_config terratec_h5_drxk = {
        .adr = 0x29,
        .single_master = 1,
        .no_i2c_bridge = 1,
        .microcode_name = "dvb-usb-terratec-h5-drxk.fw",
        .qam_demod_parameter_count = 2,
};

static struct drxk_config hauppauge_930c_drxk = {
        .adr = 0x29,
        .single_master = 1,
        .no_i2c_bridge = 1,
        .microcode_name = "dvb-usb-hauppauge-hvr930c-drxk.fw",
        .chunk_size = 56,
        .qam_demod_parameter_count = 2,
};

static struct drxk_config terratec_htc_stick_drxk = {
        .adr = 0x29,
        .single_master = 1,
        .no_i2c_bridge = 1,
        .microcode_name = "dvb-usb-terratec-htc-stick-drxk.fw",
        .chunk_size = 54,
        .qam_demod_parameter_count = 2,
        /* Required for the antenna_gpio to disable LNA. */
        .antenna_dvbt = true,
        /* The windows driver uses the same. This will disable LNA. */
        .antenna_gpio = 0x6,
};

static struct drxk_config maxmedia_ub425_tc_drxk = {
        .adr = 0x29,
        .single_master = 1,
        .no_i2c_bridge = 1,
        .microcode_name = "dvb-demod-drxk-01.fw",
        .chunk_size = 62,
        .qam_demod_parameter_count = 2,
};

static struct drxk_config pctv_520e_drxk = {
        .adr = 0x29,
        .single_master = 1,
        .microcode_name = "dvb-demod-drxk-pctv.fw",
        .qam_demod_parameter_count = 2,
        .chunk_size = 58,
        .antenna_dvbt = true, /* disable LNA */
        .antenna_gpio = (1 << 2), /* disable LNA */
};

static int drxk_gate_ctrl(struct dvb_frontend *fe, int enable)
{
        struct em28xx_dvb *dvb = fe->sec_priv;
        int status;

        if (!dvb)
                return -EINVAL;

        if (enable) {
                down(&dvb->pll_mutex);
                status = dvb->gate_ctrl(fe, 1);
        } else {
                status = dvb->gate_ctrl(fe, 0);
                up(&dvb->pll_mutex);
        }
        return status;
}

static void hauppauge_hvr930c_init(struct em28xx *dev)
{
        int i;

        static const struct em28xx_reg_seq hauppauge_hvr930c_init[] = {
                {EM2874_R80_GPIO_P0_CTRL,       0xff,   0xff,   0x65},
                {EM2874_R80_GPIO_P0_CTRL,       0xfb,   0xff,   0x32},
                {EM2874_R80_GPIO_P0_CTRL,       0xff,   0xff,   0xb8},
                {       -1,                     -1,     -1,     -1},
        };
        static const struct em28xx_reg_seq hauppauge_hvr930c_end[] = {
                {EM2874_R80_GPIO_P0_CTRL,       0xef,   0xff,   0x01},
                {EM2874_R80_GPIO_P0_CTRL,       0xaf,   0xff,   0x65},
                {EM2874_R80_GPIO_P0_CTRL,       0xef,   0xff,   0x76},
                {EM2874_R80_GPIO_P0_CTRL,       0xef,   0xff,   0x01},
                {EM2874_R80_GPIO_P0_CTRL,       0xcf,   0xff,   0x0b},
                {EM2874_R80_GPIO_P0_CTRL,       0xef,   0xff,   0x40},

                {EM2874_R80_GPIO_P0_CTRL,       0xcf,   0xff,   0x65},
                {EM2874_R80_GPIO_P0_CTRL,       0xef,   0xff,   0x65},
                {EM2874_R80_GPIO_P0_CTRL,       0xcf,   0xff,   0x0b},
                {EM2874_R80_GPIO_P0_CTRL,       0xef,   0xff,   0x65},

                {       -1,                     -1,     -1,     -1},
        };

        static const struct {
                unsigned char r[4];
                int len;
        } regs[] = {
                {{ 0x06, 0x02, 0x00, 0x31 }, 4},
                {{ 0x01, 0x02 }, 2},
                {{ 0x01, 0x02, 0x00, 0xc6 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0xff, 0xaf }, 4},
                {{ 0x01, 0x00, 0x03, 0xa0 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0x73, 0xaf }, 4},
                {{ 0x04, 0x00 }, 2},
                {{ 0x00, 0x04 }, 2},
                {{ 0x00, 0x04, 0x00, 0x0a }, 4},
                {{ 0x04, 0x14 }, 2},
                {{ 0x04, 0x14, 0x00, 0x00 }, 4},
        };

        em28xx_gpio_set(dev, hauppauge_hvr930c_init);
        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
        usleep_range(10000, 11000);
        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
        usleep_range(10000, 11000);

        dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;

        for (i = 0; i < ARRAY_SIZE(regs); i++)
                i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
                                regs[i].r, regs[i].len);
        em28xx_gpio_set(dev, hauppauge_hvr930c_end);

        msleep(100);

        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
        msleep(30);

        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x45);
        usleep_range(10000, 11000);
}

static void terratec_h5_init(struct em28xx *dev)
{
        int i;
        static const struct em28xx_reg_seq terratec_h5_init[] = {
                {EM2820_R08_GPIO_CTRL,          0xff,   0xff,   10},
                {EM2874_R80_GPIO_P0_CTRL,       0xf6,   0xff,   100},
                {EM2874_R80_GPIO_P0_CTRL,       0xf2,   0xff,   50},
                {EM2874_R80_GPIO_P0_CTRL,       0xf6,   0xff,   100},
                {       -1,                     -1,     -1,     -1},
        };
        static const struct em28xx_reg_seq terratec_h5_end[] = {
                {EM2874_R80_GPIO_P0_CTRL,       0xe6,   0xff,   100},
                {EM2874_R80_GPIO_P0_CTRL,       0xa6,   0xff,   50},
                {EM2874_R80_GPIO_P0_CTRL,       0xe6,   0xff,   100},
                {       -1,                     -1,     -1,     -1},
        };
        static const struct {
                unsigned char r[4];
                int len;
        } regs[] = {
                {{ 0x06, 0x02, 0x00, 0x31 }, 4},
                {{ 0x01, 0x02 }, 2},
                {{ 0x01, 0x02, 0x00, 0xc6 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0xff, 0xaf }, 4},
                {{ 0x01, 0x00, 0x03, 0xa0 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0x73, 0xaf }, 4},
                {{ 0x04, 0x00 }, 2},
                {{ 0x00, 0x04 }, 2},
                {{ 0x00, 0x04, 0x00, 0x0a }, 4},
                {{ 0x04, 0x14 }, 2},
                {{ 0x04, 0x14, 0x00, 0x00 }, 4},
        };

        em28xx_gpio_set(dev, terratec_h5_init);
        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
        usleep_range(10000, 11000);
        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x45);
        usleep_range(10000, 11000);

        dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;

        for (i = 0; i < ARRAY_SIZE(regs); i++)
                i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
                                regs[i].r, regs[i].len);
        em28xx_gpio_set(dev, terratec_h5_end);
};

static void terratec_htc_stick_init(struct em28xx *dev)
{
        int i;

        /*
         * GPIO configuration:
         * 0xff: unknown (does not affect DVB-T).
         * 0xf6: DRX-K (demodulator).
         * 0xe6: unknown (does not affect DVB-T).
         * 0xb6: unknown (does not affect DVB-T).
         */
        static const struct em28xx_reg_seq terratec_htc_stick_init[] = {
                {EM2820_R08_GPIO_CTRL,          0xff,   0xff,   10},
                {EM2874_R80_GPIO_P0_CTRL,       0xf6,   0xff,   100},
                {EM2874_R80_GPIO_P0_CTRL,       0xe6,   0xff,   50},
                {EM2874_R80_GPIO_P0_CTRL,       0xf6,   0xff,   100},
                {       -1,                     -1,     -1,     -1},
        };
        static const struct em28xx_reg_seq terratec_htc_stick_end[] = {
                {EM2874_R80_GPIO_P0_CTRL,       0xb6,   0xff,   100},
                {EM2874_R80_GPIO_P0_CTRL,       0xf6,   0xff,   50},
                {       -1,                     -1,     -1,     -1},
        };

        /*
         * Init the analog decoder (not yet supported), but
         * it's probably still a good idea.
         */
        static const struct {
                unsigned char r[4];
                int len;
        } regs[] = {
                {{ 0x06, 0x02, 0x00, 0x31 }, 4},
                {{ 0x01, 0x02 }, 2},
                {{ 0x01, 0x02, 0x00, 0xc6 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0xff, 0xaf }, 4},
        };

        em28xx_gpio_set(dev, terratec_htc_stick_init);

        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
        usleep_range(10000, 11000);
        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
        usleep_range(10000, 11000);

        dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;

        for (i = 0; i < ARRAY_SIZE(regs); i++)
                i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
                                regs[i].r, regs[i].len);

        em28xx_gpio_set(dev, terratec_htc_stick_end);
};

static void terratec_htc_usb_xs_init(struct em28xx *dev)
{
        int i;

        static const struct em28xx_reg_seq terratec_htc_usb_xs_init[] = {
                {EM2820_R08_GPIO_CTRL,          0xff,   0xff,   10},
                {EM2874_R80_GPIO_P0_CTRL,       0xb2,   0xff,   100},
                {EM2874_R80_GPIO_P0_CTRL,       0xb2,   0xff,   50},
                {EM2874_R80_GPIO_P0_CTRL,       0xb6,   0xff,   100},
                {       -1,                     -1,     -1,     -1},
        };
        static const struct em28xx_reg_seq terratec_htc_usb_xs_end[] = {
                {EM2874_R80_GPIO_P0_CTRL,       0xa6,   0xff,   100},
                {EM2874_R80_GPIO_P0_CTRL,       0xa6,   0xff,   50},
                {EM2874_R80_GPIO_P0_CTRL,       0xe6,   0xff,   100},
                {       -1,                     -1,     -1,     -1},
        };

        /*
         * Init the analog decoder (not yet supported), but
         * it's probably still a good idea.
         */
        static const struct {
                unsigned char r[4];
                int len;
        } regs[] = {
                {{ 0x06, 0x02, 0x00, 0x31 }, 4},
                {{ 0x01, 0x02 }, 2},
                {{ 0x01, 0x02, 0x00, 0xc6 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0xff, 0xaf }, 4},
                {{ 0x01, 0x00, 0x03, 0xa0 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0x73, 0xaf }, 4},
                {{ 0x04, 0x00 }, 2},
                {{ 0x00, 0x04 }, 2},
                {{ 0x00, 0x04, 0x00, 0x0a }, 4},
                {{ 0x04, 0x14 }, 2},
                {{ 0x04, 0x14, 0x00, 0x00 }, 4},
        };

        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);

        em28xx_gpio_set(dev, terratec_htc_usb_xs_init);

        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
        usleep_range(10000, 11000);
        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
        usleep_range(10000, 11000);

        dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;

        for (i = 0; i < ARRAY_SIZE(regs); i++)
                i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
                                regs[i].r, regs[i].len);

        em28xx_gpio_set(dev, terratec_htc_usb_xs_end);
};

static void pctv_520e_init(struct em28xx *dev)
{
        /*
         * Init AVF4910B analog decoder. Looks like I2C traffic to
         * digital demodulator and tuner are routed via AVF4910B.
         */
        int i;
        static const struct {
                unsigned char r[4];
                int len;
        } regs[] = {
                {{ 0x06, 0x02, 0x00, 0x31 }, 4},
                {{ 0x01, 0x02 }, 2},
                {{ 0x01, 0x02, 0x00, 0xc6 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0xff, 0xaf }, 4},
                {{ 0x01, 0x00, 0x03, 0xa0 }, 4},
                {{ 0x01, 0x00 }, 2},
                {{ 0x01, 0x00, 0x73, 0xaf }, 4},
        };

        dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1; /* 0x41 */

        for (i = 0; i < ARRAY_SIZE(regs); i++)
                i2c_master_send(&dev->i2c_client[dev->def_i2c_bus],
                                regs[i].r, regs[i].len);
};

static int em28xx_pctv_290e_set_lna(struct dvb_frontend *fe)
{
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct em28xx_i2c_bus *i2c_bus = fe->dvb->priv;
        struct em28xx *dev = i2c_bus->dev;
#ifdef CONFIG_GPIOLIB_LEGACY
        struct em28xx_dvb *dvb = dev->dvb;
        int ret;
        unsigned long flags;

        if (c->lna == 1)
                flags = GPIOF_OUT_INIT_HIGH; /* enable LNA */
        else
                flags = GPIOF_OUT_INIT_LOW; /* disable LNA */

        ret = gpio_request_one(dvb->lna_gpio, flags, NULL);
        if (ret)
                dev_err(&dev->intf->dev, "gpio request failed %d\n", ret);
        else
                gpio_free(dvb->lna_gpio);

        return ret;
#else
        dev_warn(&dev->intf->dev, "%s: LNA control is disabled (lna=%u)\n",
                 KBUILD_MODNAME, c->lna);
        return 0;
#endif
}

static int em28xx_pctv_292e_set_lna(struct dvb_frontend *fe)
{
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
        struct em28xx_i2c_bus *i2c_bus = fe->dvb->priv;
        struct em28xx *dev = i2c_bus->dev;
        u8 lna;

        if (c->lna == 1)
                lna = 0x01;
        else
                lna = 0x00;

        return em28xx_write_reg_bits(dev, EM2874_R80_GPIO_P0_CTRL, lna, 0x01);
}

static int em28xx_mt352_terratec_xs_init(struct dvb_frontend *fe)
{
        /* Values extracted from a USB trace of the Terratec Windows driver */
        static u8 clock_config[]   = { CLOCK_CTL,  0x38, 0x2c };
        static u8 reset[]          = { RESET,      0x80 };
        static u8 adc_ctl_1_cfg[]  = { ADC_CTL_1,  0x40 };
        static u8 agc_cfg[]        = { AGC_TARGET, 0x28, 0xa0 };
        static u8 input_freq_cfg[] = { INPUT_FREQ_1, 0x31, 0xb8 };
        static u8 rs_err_cfg[]     = { RS_ERR_PER_1, 0x00, 0x4d };
        static u8 capt_range_cfg[] = { CAPT_RANGE, 0x32 };
        static u8 trl_nom_cfg[]    = { TRL_NOMINAL_RATE_1, 0x64, 0x00 };
        static u8 tps_given_cfg[]  = { TPS_GIVEN_1, 0x40, 0x80, 0x50 };
        static u8 tuner_go[]       = { TUNER_GO, 0x01};

        mt352_write(fe, clock_config,   sizeof(clock_config));
        usleep_range(200, 250);
        mt352_write(fe, reset,          sizeof(reset));
        mt352_write(fe, adc_ctl_1_cfg,  sizeof(adc_ctl_1_cfg));
        mt352_write(fe, agc_cfg,        sizeof(agc_cfg));
        mt352_write(fe, input_freq_cfg, sizeof(input_freq_cfg));
        mt352_write(fe, rs_err_cfg,     sizeof(rs_err_cfg));
        mt352_write(fe, capt_range_cfg, sizeof(capt_range_cfg));
        mt352_write(fe, trl_nom_cfg,    sizeof(trl_nom_cfg));
        mt352_write(fe, tps_given_cfg,  sizeof(tps_given_cfg));
        mt352_write(fe, tuner_go,       sizeof(tuner_go));
        return 0;
}

static void px_bcud_init(struct em28xx *dev)
{
        int i;
        static const struct {
                unsigned char r[4];
                int len;
        } regs1[] = {
                {{ 0x0e, 0x77 }, 2},
                {{ 0x0f, 0x77 }, 2},
                {{ 0x03, 0x90 }, 2},
        }, regs2[] = {
                {{ 0x07, 0x01 }, 2},
                {{ 0x08, 0x10 }, 2},
                {{ 0x13, 0x00 }, 2},
                {{ 0x17, 0x00 }, 2},
                {{ 0x03, 0x01 }, 2},
                {{ 0x10, 0xb1 }, 2},
                {{ 0x11, 0x40 }, 2},
                {{ 0x85, 0x7a }, 2},
                {{ 0x87, 0x04 }, 2},
        };
        static const struct em28xx_reg_seq gpio[] = {
                {EM28XX_R06_I2C_CLK,            0x40,   0xff,   300},
                {EM2874_R80_GPIO_P0_CTRL,       0xfd,   0xff,   60},
                {EM28XX_R15_RGAIN,              0x20,   0xff,   0},
                {EM28XX_R16_GGAIN,              0x20,   0xff,   0},
                {EM28XX_R17_BGAIN,              0x20,   0xff,   0},
                {EM28XX_R18_ROFFSET,            0x00,   0xff,   0},
                {EM28XX_R19_GOFFSET,            0x00,   0xff,   0},
                {EM28XX_R1A_BOFFSET,            0x00,   0xff,   0},
                {EM28XX_R23_UOFFSET,            0x00,   0xff,   0},
                {EM28XX_R24_VOFFSET,            0x00,   0xff,   0},
                {EM28XX_R26_COMPR,              0x00,   0xff,   0},
                {0x13,                          0x08,   0xff,   0},
                {EM28XX_R12_VINENABLE,          0x27,   0xff,   0},
                {EM28XX_R0C_USBSUSP,            0x10,   0xff,   0},
                {EM28XX_R27_OUTFMT,             0x00,   0xff,   0},
                {EM28XX_R10_VINMODE,            0x00,   0xff,   0},
                {EM28XX_R11_VINCTRL,            0x11,   0xff,   0},
                {EM2874_R50_IR_CONFIG,          0x01,   0xff,   0},
                {EM2874_R5F_TS_ENABLE,          0x80,   0xff,   0},
                {EM28XX_R06_I2C_CLK,            0x46,   0xff,   0},
        };
        em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x46);
        /* sleeping ISDB-T */
        dev->dvb->i2c_client_demod->addr = 0x14;
        for (i = 0; i < ARRAY_SIZE(regs1); i++)
                i2c_master_send(dev->dvb->i2c_client_demod,
                                regs1[i].r, regs1[i].len);
        /* sleeping ISDB-S */
        dev->dvb->i2c_client_demod->addr = 0x15;
        for (i = 0; i < ARRAY_SIZE(regs2); i++)
                i2c_master_send(dev->dvb->i2c_client_demod, regs2[i].r,
                                regs2[i].len);
        for (i = 0; i < ARRAY_SIZE(gpio); i++) {
                em28xx_write_reg_bits(dev, gpio[i].reg, gpio[i].val,
                                      gpio[i].mask);
                if (gpio[i].sleep > 0)
                        msleep(gpio[i].sleep);
        }
};

static struct mt352_config terratec_xs_mt352_cfg = {
        .demod_address = (0x1e >> 1),
        .no_tuner = 1,
        .if2 = 45600,
        .demod_init = em28xx_mt352_terratec_xs_init,
};

static struct tda10023_config em28xx_tda10023_config = {
        .demod_address = 0x0c,
        .invert = 1,
};

static struct cxd2820r_config em28xx_cxd2820r_config = {
        .i2c_address = (0xd8 >> 1),
        .ts_mode = CXD2820R_TS_SERIAL,
};

static struct tda18271_config em28xx_cxd2820r_tda18271_config = {
        .output_opt = TDA18271_OUTPUT_LT_OFF,
        .gate = TDA18271_GATE_DIGITAL,
};

static struct zl10353_config em28xx_zl10353_no_i2c_gate_dev = {
        .demod_address = (0x1e >> 1),
        .disable_i2c_gate_ctrl = 1,
        .no_tuner = 1,
        .parallel_ts = 1,
};

static struct mt2060_config em28xx_mt2060_config = {
        .i2c_address = 0x60,
};

static struct qt1010_config em28xx_qt1010_config = {
        .i2c_address = 0x62
};

static const struct mb86a20s_config c3tech_duo_mb86a20s_config = {
        .demod_address = 0x10,
        .is_serial = true,
};

static struct tda18271_std_map mb86a20s_tda18271_config = {
        .dvbt_6   = { .if_freq = 4000, .agc_mode = 3, .std = 4,
                      .if_lvl = 1, .rfagc_top = 0x37, },
};

static struct tda18271_config c3tech_duo_tda18271_config = {
        .std_map = &mb86a20s_tda18271_config,
        .gate    = TDA18271_GATE_DIGITAL,
        .small_i2c = TDA18271_03_BYTE_CHUNK_INIT,
};

static struct tda18271_std_map drx_j_std_map = {
        .atsc_6   = { .if_freq = 5000, .agc_mode = 3, .std = 0, .if_lvl = 1,
                      .rfagc_top = 0x37, },
        .qam_6    = { .if_freq = 5380, .agc_mode = 3, .std = 3, .if_lvl = 1,
                      .rfagc_top = 0x37, },
};

static struct tda18271_config pinnacle_80e_dvb_config = {
        .std_map = &drx_j_std_map,
        .gate    = TDA18271_GATE_DIGITAL,
        .role    = TDA18271_MASTER,
};

static struct lgdt3306a_config hauppauge_01595_lgdt3306a_config = {
        .qam_if_khz         = 4000,
        .vsb_if_khz         = 3250,
        .spectral_inversion = 0,
        .deny_i2c_rptr      = 0,
        .mpeg_mode          = LGDT3306A_MPEG_SERIAL,
        .tpclk_edge         = LGDT3306A_TPCLK_RISING_EDGE,
        .tpvalid_polarity   = LGDT3306A_TP_VALID_HIGH,
        .xtalMHz            = 25,
};

/* ------------------------------------------------------------------ */

static noinline_for_stack int em28xx_attach_xc3028(u8 addr, struct em28xx *dev)
{
        struct dvb_frontend *fe;
        struct xc2028_config cfg;
        struct xc2028_ctrl ctl;

        memset(&cfg, 0, sizeof(cfg));
        cfg.i2c_adap  = &dev->i2c_adap[dev->def_i2c_bus];
        cfg.i2c_addr  = addr;

        memset(&ctl, 0, sizeof(ctl));
        em28xx_setup_xc3028(dev, &ctl);
        cfg.ctrl  = &ctl;

        if (!dev->dvb->fe[0]) {
                dev_err(&dev->intf->dev,
                        "dvb frontend not attached. Can't attach xc3028\n");
                return -EINVAL;
        }

        fe = dvb_attach(xc2028_attach, dev->dvb->fe[0], &cfg);
        if (!fe) {
                dev_err(&dev->intf->dev, "xc3028 attach failed\n");
                dvb_frontend_detach(dev->dvb->fe[0]);
                dev->dvb->fe[0] = NULL;
                return -EINVAL;
        }

        dev_info(&dev->intf->dev, "xc3028 attached\n");

        return 0;
}

/* ------------------------------------------------------------------ */

static int em28xx_register_dvb(struct em28xx_dvb *dvb, struct module *module,
                               struct em28xx *dev, struct device *device)
{
        int result;
        bool create_rf_connector = false;

        mutex_init(&dvb->lock);

        /* register adapter */
        result = dvb_register_adapter(&dvb->adapter,
                                      dev_name(&dev->intf->dev), module,
                                      device, adapter_nr);
        if (result < 0) {
                dev_warn(&dev->intf->dev,
                         "dvb_register_adapter failed (errno = %d)\n",
                         result);
                goto fail_adapter;
        }
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
        dvb->adapter.mdev = dev->media_dev;
#endif

        /* Ensure all frontends negotiate bus access */
        dvb->fe[0]->ops.ts_bus_ctrl = em28xx_dvb_bus_ctrl;
        if (dvb->fe[1])
                dvb->fe[1]->ops.ts_bus_ctrl = em28xx_dvb_bus_ctrl;

        dvb->adapter.priv = &dev->i2c_bus[dev->def_i2c_bus];

        /* register frontend */
        result = dvb_register_frontend(&dvb->adapter, dvb->fe[0]);
        if (result < 0) {
                dev_warn(&dev->intf->dev,
                         "dvb_register_frontend failed (errno = %d)\n",
                         result);
                goto fail_frontend0;
        }

        /* register 2nd frontend */
        if (dvb->fe[1]) {
                result = dvb_register_frontend(&dvb->adapter, dvb->fe[1]);
                if (result < 0) {
                        dev_warn(&dev->intf->dev,
                                 "2nd dvb_register_frontend failed (errno = %d)\n",
                                 result);
                        goto fail_frontend1;
                }
        }

        /* register demux stuff */
        dvb->demux.dmx.capabilities =
                DMX_TS_FILTERING | DMX_SECTION_FILTERING |
                DMX_MEMORY_BASED_FILTERING;
        dvb->demux.priv       = dvb;
        dvb->demux.filternum  = 256;
        dvb->demux.feednum    = 256;
        dvb->demux.start_feed = em28xx_start_feed;
        dvb->demux.stop_feed  = em28xx_stop_feed;

        result = dvb_dmx_init(&dvb->demux);
        if (result < 0) {
                dev_warn(&dev->intf->dev,
                         "dvb_dmx_init failed (errno = %d)\n",
                         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) {
                dev_warn(&dev->intf->dev,
                         "dvb_dmxdev_init failed (errno = %d)\n",
                         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) {
                dev_warn(&dev->intf->dev,
                         "add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
                         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) {
                dev_warn(&dev->intf->dev,
                         "add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
                         result);
                goto fail_fe_mem;
        }

        result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
        if (result < 0) {
                dev_warn(&dev->intf->dev,
                         "connect_frontend failed (errno = %d)\n",
                         result);
                goto fail_fe_conn;
        }

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

        /* If the analog part won't create RF connectors, DVB will do it */
        if (!dev->has_video || dev->tuner_type == TUNER_ABSENT)
                create_rf_connector = true;

        result = dvb_create_media_graph(&dvb->adapter, create_rf_connector);
        if (result < 0)
                goto fail_create_graph;

        return 0;

fail_create_graph:
        dvb_net_release(&dvb->net);
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:
        if (dvb->fe[1])
                dvb_unregister_frontend(dvb->fe[1]);
        dvb_unregister_frontend(dvb->fe[0]);
fail_frontend1:
        if (dvb->fe[1])
                dvb_frontend_detach(dvb->fe[1]);
fail_frontend0:
        dvb_frontend_detach(dvb->fe[0]);
        dvb_unregister_adapter(&dvb->adapter);
fail_adapter:
        return result;
}

static void em28xx_unregister_dvb(struct em28xx_dvb *dvb)
{
        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);
        if (dvb->fe[1])
                dvb_unregister_frontend(dvb->fe[1]);
        dvb_unregister_frontend(dvb->fe[0]);
        if (dvb->fe[1] && !dvb->dont_attach_fe1)
                dvb_frontend_detach(dvb->fe[1]);
        dvb_frontend_detach(dvb->fe[0]);
        dvb_unregister_adapter(&dvb->adapter);
}

static int em28174_dvb_init_pctv_460e(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct tda10071_platform_data tda10071_pdata = {};
        struct a8293_platform_data a8293_pdata = {};

        /* attach demod + tuner combo */
        tda10071_pdata.clk = 40444000; /* 40.444 MHz */
        tda10071_pdata.i2c_wr_max = 64;
        tda10071_pdata.ts_mode = TDA10071_TS_SERIAL;
        tda10071_pdata.pll_multiplier = 20;
        tda10071_pdata.tuner_i2c_addr = 0x14;

        dvb->i2c_client_demod = dvb_module_probe("tda10071", "tda10071_cx24118",
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 0x55, &tda10071_pdata);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        dvb->fe[0] = tda10071_pdata.get_dvb_frontend(dvb->i2c_client_demod);

        /* attach SEC */
        a8293_pdata.dvb_frontend = dvb->fe[0];

        dvb->i2c_client_sec = dvb_module_probe("a8293", NULL,
                                               &dev->i2c_adap[dev->def_i2c_bus],
                                               0x08, &a8293_pdata);
        if (!dvb->i2c_client_sec) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        return 0;
}

static int em28178_dvb_init_pctv_461e(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct i2c_adapter *i2c_adapter;
        struct m88ds3103_platform_data m88ds3103_pdata = {};
        struct ts2020_config ts2020_config = {};
        struct a8293_platform_data a8293_pdata = {};

        /* attach demod */
        m88ds3103_pdata.clk = 27000000;
        m88ds3103_pdata.i2c_wr_max = 33;
        m88ds3103_pdata.ts_mode = M88DS3103_TS_PARALLEL;
        m88ds3103_pdata.ts_clk = 16000;
        m88ds3103_pdata.ts_clk_pol = 1;
        m88ds3103_pdata.agc = 0x99;

        dvb->i2c_client_demod = dvb_module_probe("m88ds3103", NULL,
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 0x68, &m88ds3103_pdata);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        dvb->fe[0] = m88ds3103_pdata.get_dvb_frontend(dvb->i2c_client_demod);
        i2c_adapter = m88ds3103_pdata.get_i2c_adapter(dvb->i2c_client_demod);

        /* attach tuner */
        ts2020_config.fe = dvb->fe[0];

        dvb->i2c_client_tuner = dvb_module_probe("ts2020", "ts2022",
                                                 i2c_adapter,
                                                 0x60, &ts2020_config);
        if (!dvb->i2c_client_tuner) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        /* delegate signal strength measurement to tuner */
        dvb->fe[0]->ops.read_signal_strength =
                        dvb->fe[0]->ops.tuner_ops.get_rf_strength;

        /* attach SEC */
        a8293_pdata.dvb_frontend = dvb->fe[0];
        /*
         * 461e has a tendency to have vIN undervoltage troubles.
         * Slew mitigates this.
         */
        a8293_pdata.volt_slew_nanos_per_mv = 20;

        dvb->i2c_client_sec = dvb_module_probe("a8293", NULL,
                                               &dev->i2c_adap[dev->def_i2c_bus],
                                               0x08, &a8293_pdata);
        if (!dvb->i2c_client_sec) {
                dvb_module_release(dvb->i2c_client_tuner);
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        return 0;
}

static int em28178_dvb_init_pctv_461e_v2(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct i2c_adapter *i2c_adapter;
        struct m88ds3103_platform_data m88ds3103_pdata = {};
        struct ts2020_config ts2020_config = {};
        struct a8293_platform_data a8293_pdata = {};

        /* attach demod */
        m88ds3103_pdata.clk = 27000000;
        m88ds3103_pdata.i2c_wr_max = 33;
        m88ds3103_pdata.ts_mode = M88DS3103_TS_PARALLEL;
        m88ds3103_pdata.ts_clk = 16000;
        m88ds3103_pdata.ts_clk_pol = 0;
        m88ds3103_pdata.agc = 0x99;
        m88ds3103_pdata.agc_inv = 0;
        m88ds3103_pdata.spec_inv = 0;
        dvb->i2c_client_demod = dvb_module_probe("m88ds3103", "m88ds3103b",
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 0x6a, &m88ds3103_pdata);

        if (!dvb->i2c_client_demod)
                return -ENODEV;

        dvb->fe[0] = m88ds3103_pdata.get_dvb_frontend(dvb->i2c_client_demod);
        i2c_adapter = m88ds3103_pdata.get_i2c_adapter(dvb->i2c_client_demod);

        /* attach tuner */
        ts2020_config.fe = dvb->fe[0];
        dvb->i2c_client_tuner = dvb_module_probe("ts2020", "ts2022",
                                                 i2c_adapter,
                                                 0x60, &ts2020_config);
        if (!dvb->i2c_client_tuner) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        /* delegate signal strength measurement to tuner */
        dvb->fe[0]->ops.read_signal_strength =
                        dvb->fe[0]->ops.tuner_ops.get_rf_strength;

        /* attach SEC */
        a8293_pdata.dvb_frontend = dvb->fe[0];
        dvb->i2c_client_sec = dvb_module_probe("a8293", NULL,
                                               &dev->i2c_adap[dev->def_i2c_bus],
                                               0x08, &a8293_pdata);
        if (!dvb->i2c_client_sec) {
                dvb_module_release(dvb->i2c_client_tuner);
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        return 0;
}

static int em28178_dvb_init_pctv_292e(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct i2c_adapter *adapter;
        struct si2168_config si2168_config = {};
        struct si2157_config si2157_config = {};

        /* attach demod */
        si2168_config.i2c_adapter = &adapter;
        si2168_config.fe = &dvb->fe[0];
        si2168_config.ts_mode = SI2168_TS_PARALLEL;
        si2168_config.spectral_inversion = true;

        dvb->i2c_client_demod = dvb_module_probe("si2168", NULL,
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 0x64, &si2168_config);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        /* attach tuner */
        si2157_config.fe = dvb->fe[0];
        si2157_config.if_port = 1;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
        si2157_config.mdev = dev->media_dev;
#endif
        dvb->i2c_client_tuner = dvb_module_probe("si2157", NULL,
                                                 adapter,
                                                 0x60, &si2157_config);
        if (!dvb->i2c_client_tuner) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }
        dvb->fe[0]->ops.set_lna = em28xx_pctv_292e_set_lna;

        return 0;
}

static int em28178_dvb_init_terratec_t2_stick_hd(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct i2c_adapter *adapter;
        struct si2168_config si2168_config = {};
        struct si2157_config si2157_config = {};

        /* attach demod */
        si2168_config.i2c_adapter = &adapter;
        si2168_config.fe = &dvb->fe[0];
        si2168_config.ts_mode = SI2168_TS_PARALLEL;

        dvb->i2c_client_demod = dvb_module_probe("si2168", NULL,
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 0x64, &si2168_config);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        /* attach tuner */
        memset(&si2157_config, 0, sizeof(si2157_config));
        si2157_config.fe = dvb->fe[0];
        si2157_config.if_port = 0;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
        si2157_config.mdev = dev->media_dev;
#endif
        dvb->i2c_client_tuner = dvb_module_probe("si2157", "si2146",
                                                 adapter,
                                                 0x60, &si2157_config);
        if (!dvb->i2c_client_tuner) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        return 0;
}

static int em28178_dvb_init_plex_px_bcud(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct tc90522_config tc90522_config = {};
        struct qm1d1c0042_config qm1d1c0042_config = {};

        /* attach demod */
        dvb->i2c_client_demod = dvb_module_probe("tc90522", "tc90522sat",
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 0x15, &tc90522_config);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        /* attach tuner */
        qm1d1c0042_config.fe = tc90522_config.fe;
        qm1d1c0042_config.lpf = 1;

        dvb->i2c_client_tuner = dvb_module_probe("qm1d1c0042", NULL,
                                                 tc90522_config.tuner_i2c,
                                                 0x61, &qm1d1c0042_config);
        if (!dvb->i2c_client_tuner) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        dvb->fe[0] = tc90522_config.fe;
        px_bcud_init(dev);

        return 0;
}

static int em28174_dvb_init_hauppauge_wintv_dualhd_dvb(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct i2c_adapter *adapter;
        struct si2168_config si2168_config = {};
        struct si2157_config si2157_config = {};
        unsigned char addr;

        /* attach demod */
        si2168_config.i2c_adapter = &adapter;
        si2168_config.fe = &dvb->fe[0];
        si2168_config.ts_mode = SI2168_TS_SERIAL;
        si2168_config.spectral_inversion = true;
        addr = (dev->ts == PRIMARY_TS) ? 0x64 : 0x67;

        dvb->i2c_client_demod = dvb_module_probe("si2168", NULL,
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 addr, &si2168_config);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        /* attach tuner */
        memset(&si2157_config, 0, sizeof(si2157_config));
        si2157_config.fe = dvb->fe[0];
        si2157_config.if_port = 1;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
        si2157_config.mdev = dev->media_dev;
#endif
        addr = (dev->ts == PRIMARY_TS) ? 0x60 : 0x63;

        dvb->i2c_client_tuner = dvb_module_probe("si2157", NULL,
                                                 adapter,
                                                 addr, &si2157_config);
        if (!dvb->i2c_client_tuner) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        return 0;
}

static int em28174_dvb_init_hauppauge_wintv_dualhd_01595(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct i2c_adapter *adapter;
        struct lgdt3306a_config lgdt3306a_config =  {};
        struct si2157_config si2157_config = {};
        unsigned char addr;

        /* attach demod */
        lgdt3306a_config = hauppauge_01595_lgdt3306a_config;
        lgdt3306a_config.fe = &dvb->fe[0];
        lgdt3306a_config.i2c_adapter = &adapter;
        addr = (dev->ts == PRIMARY_TS) ? 0x59 : 0x0e;

        dvb->i2c_client_demod = dvb_module_probe("lgdt3306a", NULL,
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 addr, &lgdt3306a_config);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        /* attach tuner */
        si2157_config.fe = dvb->fe[0];
        si2157_config.if_port = 1;
        si2157_config.inversion = 1;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
        si2157_config.mdev = dev->media_dev;
#endif
        addr = (dev->ts == PRIMARY_TS) ? 0x60 : 0x62;

        dvb->i2c_client_tuner = dvb_module_probe("si2157", NULL,
                                                 adapter,
                                                 addr, &si2157_config);
        if (!dvb->i2c_client_tuner) {
                dvb_module_release(dvb->i2c_client_demod);
                return -ENODEV;
        }

        return 0;
}

static int em2874_dvb_init_hauppauge_usb_quadhd(struct em28xx *dev)
{
        struct em28xx_dvb *dvb = dev->dvb;
        struct mxl692_config mxl692_config = {};
        unsigned char addr;

        /* attach demod/tuner combo */
        mxl692_config.id = (dev->ts == PRIMARY_TS) ? 0 : 1;
        mxl692_config.fe = &dvb->fe[0];
        addr = (dev->ts == PRIMARY_TS) ? 0x60 : 0x63;

        dvb->i2c_client_demod = dvb_module_probe("mxl692", NULL,
                                                 &dev->i2c_adap[dev->def_i2c_bus],
                                                 addr, &mxl692_config);
        if (!dvb->i2c_client_demod)
                return -ENODEV;

        return 0;
}

static int em28xx_dvb_init(struct em28xx *dev)
{
        int result = 0, dvb_alt = 0;
        struct em28xx_dvb *dvb;
        struct usb_device *udev;

        if (dev->is_audio_only) {
                /* Shouldn't initialize IR for this interface */
                return 0;
        }

        if (!dev->board.has_dvb) {
                /* This device does not support the extension */
                return 0;
        }

        dev_info(&dev->intf->dev, "Binding DVB extension\n");

        dvb = kzalloc_obj(*dvb);
        if (!dvb)
                return -ENOMEM;

        dev->dvb = dvb;
        dvb->fe[0] = NULL;
        dvb->fe[1] = NULL;

        /* pre-allocate DVB usb transfer buffers */
        if (dev->dvb_xfer_bulk) {
                result = em28xx_alloc_urbs(dev, EM28XX_DIGITAL_MODE,
                                           dev->dvb_xfer_bulk,
                                           EM28XX_DVB_NUM_BUFS,
                                           512,
                                           EM28XX_DVB_BULK_PACKET_MULTIPLIER);
        } else {
                result = em28xx_alloc_urbs(dev, EM28XX_DIGITAL_MODE,
                                           dev->dvb_xfer_bulk,
                                           EM28XX_DVB_NUM_BUFS,
                                           dev->dvb_max_pkt_size_isoc,
                                           EM28XX_DVB_NUM_ISOC_PACKETS);
        }
        if (result) {
                dev_err(&dev->intf->dev,
                        "failed to pre-allocate USB transfer buffers for DVB.\n");
                kfree(dvb);
                dev->dvb = NULL;
                return result;
        }

        mutex_lock(&dev->lock);
        em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
        /* init frontend */
        switch (dev->model) {
        case EM2874_BOARD_LEADERSHIP_ISDBT:
                dvb->fe[0] = dvb_attach(s921_attach,
                                        &sharp_isdbt,
                                        &dev->i2c_adap[dev->def_i2c_bus]);

                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }

                break;
        case EM2883_BOARD_HAUPPAUGE_WINTV_HVR_850:
        case EM2883_BOARD_HAUPPAUGE_WINTV_HVR_950:
        case EM2880_BOARD_PINNACLE_PCTV_HD_PRO:
        case EM2880_BOARD_AMD_ATI_TV_WONDER_HD_600:
                dvb->fe[0] = dvb_attach(lgdt330x_attach,
                                        &em2880_lgdt3303_dev,
                                        0x0e,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (em28xx_attach_xc3028(0x61, dev) < 0) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2880_BOARD_KWORLD_DVB_310U:
                dvb->fe[0] = dvb_attach(zl10353_attach,
                                        &em28xx_zl10353_with_xc3028,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (em28xx_attach_xc3028(0x61, dev) < 0) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900:
        case EM2882_BOARD_TERRATEC_HYBRID_XS:
        case EM2880_BOARD_EMPIRE_DUAL_TV:
        case EM2882_BOARD_ZOLID_HYBRID_TV_STICK:
                dvb->fe[0] = dvb_attach(zl10353_attach,
                                        &em28xx_zl10353_xc3028_no_i2c_gate,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (em28xx_attach_xc3028(0x61, dev) < 0) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2880_BOARD_TERRATEC_HYBRID_XS:
        case EM2880_BOARD_TERRATEC_HYBRID_XS_FR:
        case EM2881_BOARD_PINNACLE_HYBRID_PRO:
        case EM2882_BOARD_DIKOM_DK300:
        case EM2882_BOARD_KWORLD_VS_DVBT:
                /*
                 * Those boards could have either a zl10353 or a mt352.
                 * If the chip id isn't for zl10353, try mt352.
                 */
                dvb->fe[0] = dvb_attach(zl10353_attach,
                                        &em28xx_zl10353_xc3028_no_i2c_gate,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0])
                        dvb->fe[0] = dvb_attach(mt352_attach,
                                                &terratec_xs_mt352_cfg,
                                                &dev->i2c_adap[dev->def_i2c_bus]);

                if (em28xx_attach_xc3028(0x61, dev) < 0) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2870_BOARD_TERRATEC_XS_MT2060:
                dvb->fe[0] = dvb_attach(zl10353_attach,
                                        &em28xx_zl10353_no_i2c_gate_dev,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (dvb->fe[0]) {
                        dvb_attach(mt2060_attach, dvb->fe[0],
                                   &dev->i2c_adap[dev->def_i2c_bus],
                                   &em28xx_mt2060_config, 1220);
                }
                break;
        case EM2870_BOARD_KWORLD_355U:
                dvb->fe[0] = dvb_attach(zl10353_attach,
                                        &em28xx_zl10353_no_i2c_gate_dev,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (dvb->fe[0])
                        dvb_attach(qt1010_attach, dvb->fe[0],
                                   &dev->i2c_adap[dev->def_i2c_bus],
                                   &em28xx_qt1010_config);
                break;
        case EM2883_BOARD_KWORLD_HYBRID_330U:
        case EM2882_BOARD_EVGA_INDTUBE:
                dvb->fe[0] = dvb_attach(s5h1409_attach,
                                        &em28xx_s5h1409_with_xc3028,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (em28xx_attach_xc3028(0x61, dev) < 0) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2882_BOARD_KWORLD_ATSC_315U:
                dvb->fe[0] = dvb_attach(lgdt330x_attach,
                                        &em2880_lgdt3303_dev,
                                        0x0e,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (dvb->fe[0]) {
                        if (!dvb_attach(simple_tuner_attach, dvb->fe[0],
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        0x61, TUNER_THOMSON_DTT761X)) {
                                result = -EINVAL;
                                goto out_free;
                        }
                }
                break;
        case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900_R2:
        case EM2882_BOARD_PINNACLE_HYBRID_PRO_330E:
                dvb->fe[0] = dvb_attach(drxd_attach, &em28xx_drxd, NULL,
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        &dev->intf->dev);
                if (em28xx_attach_xc3028(0x61, dev) < 0) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2870_BOARD_REDDO_DVB_C_USB_BOX:
                /* Philips CU1216L NIM (Philips TDA10023 + Infineon TUA6034) */
                dvb->fe[0] = dvb_attach(tda10023_attach,
                                        &em28xx_tda10023_config,
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        0x48);
                if (dvb->fe[0]) {
                        if (!dvb_attach(simple_tuner_attach, dvb->fe[0],
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        0x60, TUNER_PHILIPS_CU1216L)) {
                                result = -EINVAL;
                                goto out_free;
                        }
                }
                break;
        case EM2870_BOARD_KWORLD_A340:
                dvb->fe[0] = dvb_attach(lgdt3305_attach,
                                        &em2870_lgdt3304_dev,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }
                if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
                                &dev->i2c_adap[dev->def_i2c_bus],
                                &kworld_a340_config)) {
                        dvb_frontend_detach(dvb->fe[0]);
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM28174_BOARD_PCTV_290E:
                /* set default GPIO0 for LNA, used if GPIOLIB is undefined */
                dvb->lna_gpio = CXD2820R_GPIO_E | CXD2820R_GPIO_O |
                                CXD2820R_GPIO_L;
                dvb->fe[0] = dvb_attach(cxd2820r_attach,
                                        &em28xx_cxd2820r_config,
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        &dvb->lna_gpio);
                if (dvb->fe[0]) {
                        /* FE 0 attach tuner */
                        if (!dvb_attach(tda18271_attach,
                                        dvb->fe[0],
                                        0x60,
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        &em28xx_cxd2820r_tda18271_config)) {
                                dvb_frontend_detach(dvb->fe[0]);
                                result = -EINVAL;
                                goto out_free;
                        }

#ifdef CONFIG_GPIOLIB_LEGACY
                        /* enable LNA for DVB-T, DVB-T2 and DVB-C */
                        result = gpio_request_one(dvb->lna_gpio,
                                                  GPIOF_OUT_INIT_LOW, NULL);
                        if (result)
                                dev_err(&dev->intf->dev,
                                        "gpio request failed %d\n",
                                        result);
                        else
                                gpio_free(dvb->lna_gpio);

                        result = 0; /* continue even set LNA fails */
#endif
                        dvb->fe[0]->ops.set_lna = em28xx_pctv_290e_set_lna;
                }

                break;
        case EM2884_BOARD_HAUPPAUGE_WINTV_HVR_930C:
        {
                struct xc5000_config cfg = {};

                hauppauge_hvr930c_init(dev);

                dvb->fe[0] = dvb_attach(drxk_attach,
                                        &hauppauge_930c_drxk,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }
                /* FIXME: do we need a pll semaphore? */
                dvb->fe[0]->sec_priv = dvb;
                sema_init(&dvb->pll_mutex, 1);
                dvb->gate_ctrl = dvb->fe[0]->ops.i2c_gate_ctrl;
                dvb->fe[0]->ops.i2c_gate_ctrl = drxk_gate_ctrl;

                /* Attach xc5000 */
                cfg.i2c_address  = 0x61;
                cfg.if_khz = 4000;

                if (dvb->fe[0]->ops.i2c_gate_ctrl)
                        dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 1);
                if (!dvb_attach(xc5000_attach, dvb->fe[0],
                                &dev->i2c_adap[dev->def_i2c_bus], &cfg)) {
                        result = -EINVAL;
                        goto out_free;
                }
                if (dvb->fe[0]->ops.i2c_gate_ctrl)
                        dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 0);

                break;
        }
        case EM2884_BOARD_TERRATEC_H5:
                terratec_h5_init(dev);

                dvb->fe[0] = dvb_attach(drxk_attach, &terratec_h5_drxk,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }
                /* FIXME: do we need a pll semaphore? */
                dvb->fe[0]->sec_priv = dvb;
                sema_init(&dvb->pll_mutex, 1);
                dvb->gate_ctrl = dvb->fe[0]->ops.i2c_gate_ctrl;
                dvb->fe[0]->ops.i2c_gate_ctrl = drxk_gate_ctrl;

                /* Attach tda18271 to DVB-C frontend */
                if (dvb->fe[0]->ops.i2c_gate_ctrl)
                        dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 1);
                if (!dvb_attach(tda18271c2dd_attach, dvb->fe[0],
                                &dev->i2c_adap[dev->def_i2c_bus], 0x60)) {
                        result = -EINVAL;
                        goto out_free;
                }
                if (dvb->fe[0]->ops.i2c_gate_ctrl)
                        dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 0);

                break;
        case EM2884_BOARD_C3TECH_DIGITAL_DUO:
                dvb->fe[0] = dvb_attach(mb86a20s_attach,
                                        &c3tech_duo_mb86a20s_config,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (dvb->fe[0])
                        dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
                                   &dev->i2c_adap[dev->def_i2c_bus],
                                   &c3tech_duo_tda18271_config);
                break;
        case EM28174_BOARD_PCTV_460E:
                result = em28174_dvb_init_pctv_460e(dev);
                if (result)
                        goto out_free;
                break;
        case EM2874_BOARD_DELOCK_61959:
        case EM2874_BOARD_MAXMEDIA_UB425_TC:
                /* attach demodulator */
                dvb->fe[0] = dvb_attach(drxk_attach, &maxmedia_ub425_tc_drxk,
                                        &dev->i2c_adap[dev->def_i2c_bus]);

                if (dvb->fe[0]) {
                        /* disable I2C-gate */
                        dvb->fe[0]->ops.i2c_gate_ctrl = NULL;

                        /* attach tuner */
                        if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        &em28xx_cxd2820r_tda18271_config)) {
                                dvb_frontend_detach(dvb->fe[0]);
                                result = -EINVAL;
                                goto out_free;
                        }
                }
                break;
        case EM2884_BOARD_PCTV_510E:
        case EM2884_BOARD_PCTV_520E:
                pctv_520e_init(dev);

                /* attach demodulator */
                dvb->fe[0] = dvb_attach(drxk_attach, &pctv_520e_drxk,
                                        &dev->i2c_adap[dev->def_i2c_bus]);

                if (dvb->fe[0]) {
                        /* attach tuner */
                        if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
                                        &dev->i2c_adap[dev->def_i2c_bus],
                                        &em28xx_cxd2820r_tda18271_config)) {
                                dvb_frontend_detach(dvb->fe[0]);
                                result = -EINVAL;
                                goto out_free;
                        }
                }
                break;
        case EM2884_BOARD_ELGATO_EYETV_HYBRID_2008:
        case EM2884_BOARD_CINERGY_HTC_STICK:
        case EM2884_BOARD_TERRATEC_H6:
                terratec_htc_stick_init(dev);

                /* attach demodulator */
                dvb->fe[0] = dvb_attach(drxk_attach, &terratec_htc_stick_drxk,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }

                /* Attach the demodulator. */
                if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
                                &dev->i2c_adap[dev->def_i2c_bus],
                                &em28xx_cxd2820r_tda18271_config)) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2884_BOARD_TERRATEC_HTC_USB_XS:
                terratec_htc_usb_xs_init(dev);

                /* attach demodulator */
                dvb->fe[0] = dvb_attach(drxk_attach, &terratec_htc_stick_drxk,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }

                /* Attach the demodulator. */
                if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
                                &dev->i2c_adap[dev->def_i2c_bus],
                                &em28xx_cxd2820r_tda18271_config)) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2874_BOARD_KWORLD_UB435Q_V2:
                dvb->fe[0] = dvb_attach(lgdt3305_attach,
                                        &em2874_lgdt3305_dev,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }

                /* Attach the demodulator. */
                if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
                                &dev->i2c_adap[dev->def_i2c_bus],
                                &kworld_ub435q_v2_config)) {
                        result = -EINVAL;
                        goto out_free;
                }
                break;
        case EM2874_BOARD_KWORLD_UB435Q_V3:
        {
                struct i2c_adapter *adapter = &dev->i2c_adap[dev->def_i2c_bus];

                dvb->fe[0] = dvb_attach(lgdt3305_attach,
                                        &em2874_lgdt3305_nogate_dev,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (!dvb->fe[0]) {
                        result = -EINVAL;
                        goto out_free;
                }

                /* attach tuner */
                kworld_ub435q_v3_config.fe = dvb->fe[0];

                dvb->i2c_client_tuner = dvb_module_probe("tda18212", NULL,
                                                         adapter, 0x60,
                                                         &kworld_ub435q_v3_config);
                if (!dvb->i2c_client_tuner) {
                        dvb_frontend_detach(dvb->fe[0]);
                        result = -ENODEV;
                        goto out_free;
                }
                break;
        }
        case EM2874_BOARD_PCTV_HD_MINI_80E:
                dvb->fe[0] = dvb_attach(drx39xxj_attach,
                                        &dev->i2c_adap[dev->def_i2c_bus]);
                if (dvb->fe[0]) {
                        dvb->fe[0] = dvb_attach(tda18271_attach, dvb->fe[0],
                                                0x60,
                                                &dev->i2c_adap[dev->def_i2c_bus],
                                                &pinnacle_80e_dvb_config);
                        if (!dvb->fe[0]) {
                                result = -EINVAL;
                                goto out_free;
                        }
                }
                break;
        case EM28178_BOARD_PCTV_461E:
                result = em28178_dvb_init_pctv_461e(dev);
                if (result)
                        goto out_free;
                break;
        case EM28178_BOARD_PCTV_461E_V2:
                result = em28178_dvb_init_pctv_461e_v2(dev);
                if (result)
                        goto out_free;
                break;
        case EM28178_BOARD_PCTV_292E:
                result = em28178_dvb_init_pctv_292e(dev);
                if (result)
                        goto out_free;
                break;
        case EM28178_BOARD_TERRATEC_T2_STICK_HD:
                result = em28178_dvb_init_terratec_t2_stick_hd(dev);
                if (result)
                        goto out_free;
                break;
        case EM28178_BOARD_PLEX_PX_BCUD:
                result = em28178_dvb_init_plex_px_bcud(dev);
                if (result)
                        goto out_free;
                break;
        case EM28174_BOARD_HAUPPAUGE_WINTV_DUALHD_DVB:
                result = em28174_dvb_init_hauppauge_wintv_dualhd_dvb(dev);
                if (result)
                        goto out_free;
                break;
        case EM28174_BOARD_HAUPPAUGE_WINTV_DUALHD_01595:
                result = em28174_dvb_init_hauppauge_wintv_dualhd_01595(dev);
                if (result)
                        goto out_free;
                break;
        case EM2874_BOARD_HAUPPAUGE_USB_QUADHD:
                result = em2874_dvb_init_hauppauge_usb_quadhd(dev);
                if (result)
                        goto out_free;
                break;
        default:
                dev_err(&dev->intf->dev,
                        "The frontend of your DVB/ATSC card isn't supported yet\n");
                break;
        }
        if (!dvb->fe[0]) {
                dev_err(&dev->intf->dev, "frontend initialization failed\n");
                result = -EINVAL;
                goto out_free;
        }
        /* define general-purpose callback pointer */
        dvb->fe[0]->callback = em28xx_tuner_callback;
        if (dvb->fe[1])
                dvb->fe[1]->callback = em28xx_tuner_callback;

        /* register everything */
        result = em28xx_register_dvb(dvb, THIS_MODULE, dev, &dev->intf->dev);

        if (result < 0)
                goto out_free;

        if (dev->dvb_xfer_bulk) {
                dvb_alt = 0;
        } else { /* isoc */
                dvb_alt = dev->dvb_alt_isoc;
        }

        udev = interface_to_usbdev(dev->intf);
        usb_set_interface(udev, dev->ifnum, dvb_alt);
        dev_info(&dev->intf->dev, "DVB extension successfully initialized\n");

        kref_get(&dev->ref);

ret:
        em28xx_set_mode(dev, EM28XX_SUSPEND);
        mutex_unlock(&dev->lock);
        return result;

out_free:
        em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
        kfree(dvb);
        dev->dvb = NULL;
        goto ret;
}

static inline void prevent_sleep(struct dvb_frontend_ops *ops)
{
        ops->set_voltage = NULL;
        ops->sleep = NULL;
        ops->tuner_ops.sleep = NULL;
}

static int em28xx_dvb_fini(struct em28xx *dev)
{
        struct em28xx_dvb *dvb;

        if (dev->is_audio_only) {
                /* Shouldn't initialize IR for this interface */
                return 0;
        }

        if (!dev->board.has_dvb) {
                /* This device does not support the extension */
                return 0;
        }

        if (!dev->dvb)
                return 0;

        dev_info(&dev->intf->dev, "Closing DVB extension\n");

        dvb = dev->dvb;

        em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);

        if (dev->disconnected) {
                /*
                 * We cannot tell the device to sleep
                 * once it has been unplugged.
                 */
                if (dvb->fe[0]) {
                        prevent_sleep(&dvb->fe[0]->ops);
                        dvb->fe[0]->exit = DVB_FE_DEVICE_REMOVED;
                }
                if (dvb->fe[1]) {
                        prevent_sleep(&dvb->fe[1]->ops);
                        dvb->fe[1]->exit = DVB_FE_DEVICE_REMOVED;
                }
        }

        em28xx_unregister_dvb(dvb);

        /* release I2C module bindings */
        dvb_module_release(dvb->i2c_client_sec);
        dvb_module_release(dvb->i2c_client_tuner);
        dvb_module_release(dvb->i2c_client_demod);

        kfree(dvb);
        dev->dvb = NULL;
        kref_put(&dev->ref, em28xx_free_device);

        return 0;
}

static int em28xx_dvb_suspend(struct em28xx *dev)
{
        int ret = 0;

        if (dev->is_audio_only)
                return 0;

        if (!dev->board.has_dvb)
                return 0;

        dev_info(&dev->intf->dev, "Suspending DVB extension\n");
        if (dev->dvb) {
                struct em28xx_dvb *dvb = dev->dvb;

                if (dvb->fe[0]) {
                        ret = dvb_frontend_suspend(dvb->fe[0]);
                        dev_info(&dev->intf->dev, "fe0 suspend %d\n", ret);
                }
                if (dvb->fe[1]) {
                        dvb_frontend_suspend(dvb->fe[1]);
                        dev_info(&dev->intf->dev, "fe1 suspend %d\n", ret);
                }
        }

        return 0;
}

static int em28xx_dvb_resume(struct em28xx *dev)
{
        int ret = 0;

        if (dev->is_audio_only)
                return 0;

        if (!dev->board.has_dvb)
                return 0;

        dev_info(&dev->intf->dev, "Resuming DVB extension\n");
        if (dev->dvb) {
                struct em28xx_dvb *dvb = dev->dvb;

                if (dvb->fe[0]) {
                        ret = dvb_frontend_resume(dvb->fe[0]);
                        dev_info(&dev->intf->dev, "fe0 resume %d\n", ret);
                }

                if (dvb->fe[1]) {
                        ret = dvb_frontend_resume(dvb->fe[1]);
                        dev_info(&dev->intf->dev, "fe1 resume %d\n", ret);
                }
        }

        return 0;
}

static struct em28xx_ops dvb_ops = {
        .id   = EM28XX_DVB,
        .name = "Em28xx dvb Extension",
        .init = em28xx_dvb_init,
        .fini = em28xx_dvb_fini,
        .suspend = em28xx_dvb_suspend,
        .resume = em28xx_dvb_resume,
};

static int __init em28xx_dvb_register(void)
{
        return em28xx_register_extension(&dvb_ops);
}

static void __exit em28xx_dvb_unregister(void)
{
        em28xx_unregister_extension(&dvb_ops);
}

module_init(em28xx_dvb_register);
module_exit(em28xx_dvb_unregister);