au8522_dig.c

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/*
    Auvitek AU8522 QAM/8VSB demodulator driver

    Copyright (C) 2008 Steven Toth <[email protected]>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include "dvb_frontend.h"
#include "au8522.h"
#include "au8522_priv.h"

static int debug;

#define dprintk(arg...)\
    do { if (debug)\
        printk(arg);\
    } while (0)

struct mse2snr_tab {
    u16 val;
    u16 data;
};

/* VSB SNR lookup table */
static struct mse2snr_tab vsb_mse2snr_tab[] = {
    {   0, 270 },
    {   2, 250 },
    {   3, 240 },
    {   5, 230 },
    {   7, 220 },
    {   9, 210 },
    {  12, 200 },
    {  13, 195 },
    {  15, 190 },
    {  17, 185 },
    {  19, 180 },
    {  21, 175 },
    {  24, 170 },
    {  27, 165 },
    {  31, 160 },
    {  32, 158 },
    {  33, 156 },
    {  36, 152 },
    {  37, 150 },
    {  39, 148 },
    {  40, 146 },
    {  41, 144 },
    {  43, 142 },
    {  44, 140 },
    {  48, 135 },
    {  50, 130 },
    {  43, 142 },
    {  53, 125 },
    {  56, 120 },
    { 256, 115 },
};

/* QAM64 SNR lookup table */
static struct mse2snr_tab qam64_mse2snr_tab[] = {
    {  15,   0 },
    {  16, 290 },
    {  17, 288 },
    {  18, 286 },
    {  19, 284 },
    {  20, 282 },
    {  21, 281 },
    {  22, 279 },
    {  23, 277 },
    {  24, 275 },
    {  25, 273 },
    {  26, 271 },
    {  27, 269 },
    {  28, 268 },
    {  29, 266 },
    {  30, 264 },
    {  31, 262 },
    {  32, 260 },
    {  33, 259 },
    {  34, 258 },
    {  35, 256 },
    {  36, 255 },
    {  37, 254 },
    {  38, 252 },
    {  39, 251 },
    {  40, 250 },
    {  41, 249 },
    {  42, 248 },
    {  43, 246 },
    {  44, 245 },
    {  45, 244 },
    {  46, 242 },
    {  47, 241 },
    {  48, 240 },
    {  50, 239 },
    {  51, 238 },
    {  53, 237 },
    {  54, 236 },
    {  56, 235 },
    {  57, 234 },
    {  59, 233 },
    {  60, 232 },
    {  62, 231 },
    {  63, 230 },
    {  65, 229 },
    {  67, 228 },
    {  68, 227 },
    {  70, 226 },
    {  71, 225 },
    {  73, 224 },
    {  74, 223 },
    {  76, 222 },
    {  78, 221 },
    {  80, 220 },
    {  82, 219 },
    {  85, 218 },
    {  88, 217 },
    {  90, 216 },
    {  92, 215 },
    {  93, 214 },
    {  94, 212 },
    {  95, 211 },
    {  97, 210 },
    {  99, 209 },
    { 101, 208 },
    { 102, 207 },
    { 104, 206 },
    { 107, 205 },
    { 111, 204 },
    { 114, 203 },
    { 118, 202 },
    { 122, 201 },
    { 125, 200 },
    { 128, 199 },
    { 130, 198 },
    { 132, 197 },
    { 256, 190 },
};

/* QAM256 SNR lookup table */
static struct mse2snr_tab qam256_mse2snr_tab[] = {
    {  15,   0 },
    {  16, 400 },
    {  17, 398 },
    {  18, 396 },
    {  19, 394 },
    {  20, 392 },
    {  21, 390 },
    {  22, 388 },
    {  23, 386 },
    {  24, 384 },
    {  25, 382 },
    {  26, 380 },
    {  27, 379 },
    {  28, 378 },
    {  29, 377 },
    {  30, 376 },
    {  31, 375 },
    {  32, 374 },
    {  33, 373 },
    {  34, 372 },
    {  35, 371 },
    {  36, 370 },
    {  37, 362 },
    {  38, 354 },
    {  39, 346 },
    {  40, 338 },
    {  41, 330 },
    {  42, 328 },
    {  43, 326 },
    {  44, 324 },
    {  45, 322 },
    {  46, 320 },
    {  47, 319 },
    {  48, 318 },
    {  49, 317 },
    {  50, 316 },
    {  51, 315 },
    {  52, 314 },
    {  53, 313 },
    {  54, 312 },
    {  55, 311 },
    {  56, 310 },
    {  57, 308 },
    {  58, 306 },
    {  59, 304 },
    {  60, 302 },
    {  61, 300 },
    {  62, 298 },
    {  65, 295 },
    {  68, 294 },
    {  70, 293 },
    {  73, 292 },
    {  76, 291 },
    {  78, 290 },
    {  79, 289 },
    {  81, 288 },
    {  82, 287 },
    {  83, 286 },
    {  84, 285 },
    {  85, 284 },
    {  86, 283 },
    {  88, 282 },
    {  89, 281 },
    { 256, 280 },
};

static int au8522_mse2snr_lookup(struct mse2snr_tab *tab, int sz, int mse,
                 u16 *snr)
{
    int i, ret = -EINVAL;
    dprintk("%s()\n", __func__);

    for (i = 0; i < sz; i++) {
        if (mse < tab[i].val) {
            *snr = tab[i].data;
            ret = 0;
            break;
        }
    }
    dprintk("%s() snr=%d\n", __func__, *snr);
    return ret;
}

static int au8522_set_if(struct dvb_frontend *fe, enum au8522_if_freq if_freq)
{
    struct au8522_state *state = fe->demodulator_priv;
    u8 r0b5, r0b6, r0b7;
    char *ifmhz;

    switch (if_freq) {
    case AU8522_IF_3_25MHZ:
        ifmhz = "3.25";
        r0b5 = 0x00;
        r0b6 = 0x3d;
        r0b7 = 0xa0;
        break;
    case AU8522_IF_4MHZ:
        ifmhz = "4.00";
        r0b5 = 0x00;
        r0b6 = 0x4b;
        r0b7 = 0xd9;
        break;
    case AU8522_IF_6MHZ:
        ifmhz = "6.00";
        r0b5 = 0xfb;
        r0b6 = 0x8e;
        r0b7 = 0x39;
        break;
    default:
        dprintk("%s() IF Frequency not supported\n", __func__);
        return -EINVAL;
    }
    dprintk("%s() %s MHz\n", __func__, ifmhz);
    au8522_writereg(state, 0x80b5, r0b5);
    au8522_writereg(state, 0x80b6, r0b6);
    au8522_writereg(state, 0x80b7, r0b7);

    return 0;
}

/* VSB Modulation table */
static struct {
    u16 reg;
    u16 data;
} VSB_mod_tab[] = {
    { 0x8090, 0x84 },
    { 0x4092, 0x11 },
    { 0x2005, 0x00 },
    { 0x8091, 0x80 },
    { 0x80a3, 0x0c },
    { 0x80a4, 0xe8 },
    { 0x8081, 0xc4 },
    { 0x80a5, 0x40 },
    { 0x80a7, 0x40 },
    { 0x80a6, 0x67 },
    { 0x8262, 0x20 },
    { 0x821c, 0x30 },
    { 0x80d8, 0x1a },
    { 0x8227, 0xa0 },
    { 0x8121, 0xff },
    { 0x80a8, 0xf0 },
    { 0x80a9, 0x05 },
    { 0x80aa, 0x77 },
    { 0x80ab, 0xf0 },
    { 0x80ac, 0x05 },
    { 0x80ad, 0x77 },
    { 0x80ae, 0x41 },
    { 0x80af, 0x66 },
    { 0x821b, 0xcc },
    { 0x821d, 0x80 },
    { 0x80a4, 0xe8 },
    { 0x8231, 0x13 },
};

/* QAM64 Modulation table */
static struct {
    u16 reg;
    u16 data;
} QAM64_mod_tab[] = {
    { 0x00a3, 0x09 },
    { 0x00a4, 0x00 },
    { 0x0081, 0xc4 },
    { 0x00a5, 0x40 },
    { 0x00aa, 0x77 },
    { 0x00ad, 0x77 },
    { 0x00a6, 0x67 },
    { 0x0262, 0x20 },
    { 0x021c, 0x30 },
    { 0x00b8, 0x3e },
    { 0x00b9, 0xf0 },
    { 0x00ba, 0x01 },
    { 0x00bb, 0x18 },
    { 0x00bc, 0x50 },
    { 0x00bd, 0x00 },
    { 0x00be, 0xea },
    { 0x00bf, 0xef },
    { 0x00c0, 0xfc },
    { 0x00c1, 0xbd },
    { 0x00c2, 0x1f },
    { 0x00c3, 0xfc },
    { 0x00c4, 0xdd },
    { 0x00c5, 0xaf },
    { 0x00c6, 0x00 },
    { 0x00c7, 0x38 },
    { 0x00c8, 0x30 },
    { 0x00c9, 0x05 },
    { 0x00ca, 0x4a },
    { 0x00cb, 0xd0 },
    { 0x00cc, 0x01 },
    { 0x00cd, 0xd9 },
    { 0x00ce, 0x6f },
    { 0x00cf, 0xf9 },
    { 0x00d0, 0x70 },
    { 0x00d1, 0xdf },
    { 0x00d2, 0xf7 },
    { 0x00d3, 0xc2 },
    { 0x00d4, 0xdf },
    { 0x00d5, 0x02 },
    { 0x00d6, 0x9a },
    { 0x00d7, 0xd0 },
    { 0x0250, 0x0d },
    { 0x0251, 0xcd },
    { 0x0252, 0xe0 },
    { 0x0253, 0x05 },
    { 0x0254, 0xa7 },
    { 0x0255, 0xff },
    { 0x0256, 0xed },
    { 0x0257, 0x5b },
    { 0x0258, 0xae },
    { 0x0259, 0xe6 },
    { 0x025a, 0x3d },
    { 0x025b, 0x0f },
    { 0x025c, 0x0d },
    { 0x025d, 0xea },
    { 0x025e, 0xf2 },
    { 0x025f, 0x51 },
    { 0x0260, 0xf5 },
    { 0x0261, 0x06 },
    { 0x021a, 0x00 },
    { 0x0546, 0x40 },
    { 0x0210, 0xc7 },
    { 0x0211, 0xaa },
    { 0x0212, 0xab },
    { 0x0213, 0x02 },
    { 0x0502, 0x00 },
    { 0x0121, 0x04 },
    { 0x0122, 0x04 },
    { 0x052e, 0x10 },
    { 0x00a4, 0xca },
    { 0x00a7, 0x40 },
    { 0x0526, 0x01 },
};

/* QAM256 Modulation table */
static struct {
    u16 reg;
    u16 data;
} QAM256_mod_tab[] = {
    { 0x80a3, 0x09 },
    { 0x80a4, 0x00 },
    { 0x8081, 0xc4 },
    { 0x80a5, 0x40 },
    { 0x80aa, 0x77 },
    { 0x80ad, 0x77 },
    { 0x80a6, 0x67 },
    { 0x8262, 0x20 },
    { 0x821c, 0x30 },
    { 0x80b8, 0x3e },
    { 0x80b9, 0xf0 },
    { 0x80ba, 0x01 },
    { 0x80bb, 0x18 },
    { 0x80bc, 0x50 },
    { 0x80bd, 0x00 },
    { 0x80be, 0xea },
    { 0x80bf, 0xef },
    { 0x80c0, 0xfc },
    { 0x80c1, 0xbd },
    { 0x80c2, 0x1f },
    { 0x80c3, 0xfc },
    { 0x80c4, 0xdd },
    { 0x80c5, 0xaf },
    { 0x80c6, 0x00 },
    { 0x80c7, 0x38 },
    { 0x80c8, 0x30 },
    { 0x80c9, 0x05 },
    { 0x80ca, 0x4a },
    { 0x80cb, 0xd0 },
    { 0x80cc, 0x01 },
    { 0x80cd, 0xd9 },
    { 0x80ce, 0x6f },
    { 0x80cf, 0xf9 },
    { 0x80d0, 0x70 },
    { 0x80d1, 0xdf },
    { 0x80d2, 0xf7 },
    { 0x80d3, 0xc2 },
    { 0x80d4, 0xdf },
    { 0x80d5, 0x02 },
    { 0x80d6, 0x9a },
    { 0x80d7, 0xd0 },
    { 0x8250, 0x0d },
    { 0x8251, 0xcd },
    { 0x8252, 0xe0 },
    { 0x8253, 0x05 },
    { 0x8254, 0xa7 },
    { 0x8255, 0xff },
    { 0x8256, 0xed },
    { 0x8257, 0x5b },
    { 0x8258, 0xae },
    { 0x8259, 0xe6 },
    { 0x825a, 0x3d },
    { 0x825b, 0x0f },
    { 0x825c, 0x0d },
    { 0x825d, 0xea },
    { 0x825e, 0xf2 },
    { 0x825f, 0x51 },
    { 0x8260, 0xf5 },
    { 0x8261, 0x06 },
    { 0x821a, 0x00 },
    { 0x8546, 0x40 },
    { 0x8210, 0x26 },
    { 0x8211, 0xf6 },
    { 0x8212, 0x84 },
    { 0x8213, 0x02 },
    { 0x8502, 0x01 },
    { 0x8121, 0x04 },
    { 0x8122, 0x04 },
    { 0x852e, 0x10 },
    { 0x80a4, 0xca },
    { 0x80a7, 0x40 },
    { 0x8526, 0x01 },
};

static int au8522_enable_modulation(struct dvb_frontend *fe,
                    fe_modulation_t m)
{
    struct au8522_state *state = fe->demodulator_priv;
    int i;

    dprintk("%s(0x%08x)\n", __func__, m);

    switch (m) {
    case VSB_8:
        dprintk("%s() VSB_8\n", __func__);
        for (i = 0; i < ARRAY_SIZE(VSB_mod_tab); i++)
            au8522_writereg(state,
                VSB_mod_tab[i].reg,
                VSB_mod_tab[i].data);
        au8522_set_if(fe, state->config->vsb_if);
        break;
    case QAM_64:
        dprintk("%s() QAM 64\n", __func__);
        for (i = 0; i < ARRAY_SIZE(QAM64_mod_tab); i++)
            au8522_writereg(state,
                QAM64_mod_tab[i].reg,
                QAM64_mod_tab[i].data);
        au8522_set_if(fe, state->config->qam_if);
        break;
    case QAM_256:
        dprintk("%s() QAM 256\n", __func__);
        for (i = 0; i < ARRAY_SIZE(QAM256_mod_tab); i++)
            au8522_writereg(state,
                QAM256_mod_tab[i].reg,
                QAM256_mod_tab[i].data);
        au8522_set_if(fe, state->config->qam_if);
        break;
    default:
        dprintk("%s() Invalid modulation\n", __func__);
        return -EINVAL;
    }

    state->current_modulation = m;

    return 0;
}

/* Talk to the demod, set the FEC, GUARD, QAM settings etc */
static int au8522_set_frontend(struct dvb_frontend *fe)
{
    struct dtv_frontend_properties *c = &fe->dtv_property_cache;
    struct au8522_state *state = fe->demodulator_priv;
    int ret = -EINVAL;

    dprintk("%s(frequency=%d)\n", __func__, c->frequency);

    if ((state->current_frequency == c->frequency) &&
        (state->current_modulation == c->modulation))
        return 0;

    if (fe->ops.tuner_ops.set_params) {
        if (fe->ops.i2c_gate_ctrl)
            fe->ops.i2c_gate_ctrl(fe, 1);
        ret = fe->ops.tuner_ops.set_params(fe);
        if (fe->ops.i2c_gate_ctrl)
            fe->ops.i2c_gate_ctrl(fe, 0);
    }

    if (ret < 0)
        return ret;

    /* Allow the tuner to settle */
    msleep(100);

    au8522_enable_modulation(fe, c->modulation);

    state->current_frequency = c->frequency;

    return 0;
}

static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
    struct au8522_state *state = fe->demodulator_priv;
    u8 reg;
    u32 tuner_status = 0;

    *status = 0;

    if (state->current_modulation == VSB_8) {
        dprintk("%s() Checking VSB_8\n", __func__);
        reg = au8522_readreg(state, 0x4088);
        if ((reg & 0x03) == 0x03)
            *status |= FE_HAS_LOCK | FE_HAS_SYNC | FE_HAS_VITERBI;
    } else {
        dprintk("%s() Checking QAM\n", __func__);
        reg = au8522_readreg(state, 0x4541);
        if (reg & 0x80)
            *status |= FE_HAS_VITERBI;
        if (reg & 0x20)
            *status |= FE_HAS_LOCK | FE_HAS_SYNC;
    }

    switch (state->config->status_mode) {
    case AU8522_DEMODLOCKING:
        dprintk("%s() DEMODLOCKING\n", __func__);
        if (*status & FE_HAS_VITERBI)
            *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
        break;
    case AU8522_TUNERLOCKING:
        /* Get the tuner status */
        dprintk("%s() TUNERLOCKING\n", __func__);
        if (fe->ops.tuner_ops.get_status) {
            if (fe->ops.i2c_gate_ctrl)
                fe->ops.i2c_gate_ctrl(fe, 1);

            fe->ops.tuner_ops.get_status(fe, &tuner_status);

            if (fe->ops.i2c_gate_ctrl)
                fe->ops.i2c_gate_ctrl(fe, 0);
        }
        if (tuner_status)
            *status |= FE_HAS_CARRIER | FE_HAS_SIGNAL;
        break;
    }
    state->fe_status = *status;

    if (*status & FE_HAS_LOCK)
        /* turn on LED, if it isn't on already */
        au8522_led_ctrl(state, -1);
    else
        /* turn off LED */
        au8522_led_ctrl(state, 0);

    dprintk("%s() status 0x%08x\n", __func__, *status);

    return 0;
}

static int au8522_led_status(struct au8522_state *state, const u16 *snr)
{
    struct au8522_led_config *led_config = state->config->led_cfg;
    int led;
    u16 strong;

    /* bail out if we can't control an LED */
    if (!led_config)
        return 0;

    if (0 == (state->fe_status & FE_HAS_LOCK))
        return au8522_led_ctrl(state, 0);
    else if (state->current_modulation == QAM_256)
        strong = led_config->qam256_strong;
    else if (state->current_modulation == QAM_64)
        strong = led_config->qam64_strong;
    else /* (state->current_modulation == VSB_8) */
        strong = led_config->vsb8_strong;

    if (*snr >= strong)
        led = 2;
    else
        led = 1;

    if ((state->led_state) &&
        (((strong < *snr) ? (*snr - strong) : (strong - *snr)) <= 10))
        /* snr didn't change enough to bother
         * changing the color of the led */
        return 0;

    return au8522_led_ctrl(state, led);
}

static int au8522_read_snr(struct dvb_frontend *fe, u16 *snr)
{
    struct au8522_state *state = fe->demodulator_priv;
    int ret = -EINVAL;

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

    if (state->current_modulation == QAM_256)
        ret = au8522_mse2snr_lookup(qam256_mse2snr_tab,
                        ARRAY_SIZE(qam256_mse2snr_tab),
                        au8522_readreg(state, 0x4522),
                        snr);
    else if (state->current_modulation == QAM_64)
        ret = au8522_mse2snr_lookup(qam64_mse2snr_tab,
                        ARRAY_SIZE(qam64_mse2snr_tab),
                        au8522_readreg(state, 0x4522),
                        snr);
    else /* VSB_8 */
        ret = au8522_mse2snr_lookup(vsb_mse2snr_tab,
                        ARRAY_SIZE(vsb_mse2snr_tab),
                        au8522_readreg(state, 0x4311),
                        snr);

    if (state->config->led_cfg)
        au8522_led_status(state, snr);

    return ret;
}

static int au8522_read_signal_strength(struct dvb_frontend *fe,
                       u16 *signal_strength)
{
    /* borrowed from lgdt330x.c
     *
     * Calculate strength from SNR up to 35dB
     * Even though the SNR can go higher than 35dB,
     * there is some comfort factor in having a range of
     * strong signals that can show at 100%
     */
    u16 snr;
    u32 tmp;
    int ret = au8522_read_snr(fe, &snr);

    *signal_strength = 0;

    if (0 == ret) {
        /* The following calculation method was chosen
         * purely for the sake of code re-use from the
         * other demod drivers that use this method */

        /* Convert from SNR in dB * 10 to 8.24 fixed-point */
        tmp = (snr * ((1 << 24) / 10));

        /* Convert from 8.24 fixed-point to
         * scale the range 0 - 35*2^24 into 0 - 65535*/
        if (tmp >= 8960 * 0x10000)
            *signal_strength = 0xffff;
        else
            *signal_strength = tmp / 8960;
    }

    return ret;
}

static int au8522_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
    struct au8522_state *state = fe->demodulator_priv;

    if (state->current_modulation == VSB_8)
        *ucblocks = au8522_readreg(state, 0x4087);
    else
        *ucblocks = au8522_readreg(state, 0x4543);

    return 0;
}

static int au8522_read_ber(struct dvb_frontend *fe, u32 *ber)
{
    return au8522_read_ucblocks(fe, ber);
}

static int au8522_get_frontend(struct dvb_frontend *fe)
{
    struct dtv_frontend_properties *c = &fe->dtv_property_cache;
    struct au8522_state *state = fe->demodulator_priv;

    c->frequency = state->current_frequency;
    c->modulation = state->current_modulation;

    return 0;
}

static int au8522_get_tune_settings(struct dvb_frontend *fe,
                    struct dvb_frontend_tune_settings *tune)
{
    tune->min_delay_ms = 1000;
    return 0;
}

static struct dvb_frontend_ops au8522_ops;


static void au8522_release(struct dvb_frontend *fe)
{
    struct au8522_state *state = fe->demodulator_priv;
    au8522_release_state(state);
}

struct dvb_frontend *au8522_attach(const struct au8522_config *config,
                   struct i2c_adapter *i2c)
{
    struct au8522_state *state = NULL;
    int instance;

    /* allocate memory for the internal state */
    instance = au8522_get_state(&state, i2c, config->demod_address);
    switch (instance) {
    case 0:
        dprintk("%s state allocation failed\n", __func__);
        break;
    case 1:
        /* new demod instance */
        dprintk("%s using new instance\n", __func__);
        break;
    default:
        /* existing demod instance */
        dprintk("%s using existing instance\n", __func__);
        break;
    }

    /* setup the state */
    state->config = config;
    state->i2c = i2c;
    state->operational_mode = AU8522_DIGITAL_MODE;

    /* create dvb_frontend */
    memcpy(&state->frontend.ops, &au8522_ops,
           sizeof(struct dvb_frontend_ops));
    state->frontend.demodulator_priv = state;

    state->frontend.ops.analog_ops.i2c_gate_ctrl = au8522_analog_i2c_gate_ctrl;

    if (au8522_init(&state->frontend) != 0) {
        printk(KERN_ERR "%s: Failed to initialize correctly\n",
            __func__);
        goto error;
    }

    /* Note: Leaving the I2C gate open here. */
    au8522_i2c_gate_ctrl(&state->frontend, 1);

    return &state->frontend;

error:
    au8522_release_state(state);
    return NULL;
}
EXPORT_SYMBOL(au8522_attach);

static struct dvb_frontend_ops au8522_ops = {
    .delsys = { SYS_ATSC, SYS_DVBC_ANNEX_B },
    .info = {
        .name           = "Auvitek AU8522 QAM/8VSB Frontend",
        .frequency_min      = 54000000,
        .frequency_max      = 858000000,
        .frequency_stepsize = 62500,
        .caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
    },

    .init                 = au8522_init,
    .sleep                = au8522_sleep,
    .i2c_gate_ctrl        = au8522_i2c_gate_ctrl,
    .set_frontend         = au8522_set_frontend,
    .get_frontend         = au8522_get_frontend,
    .get_tune_settings    = au8522_get_tune_settings,
    .read_status          = au8522_read_status,
    .read_ber             = au8522_read_ber,
    .read_signal_strength = au8522_read_signal_strength,
    .read_snr             = au8522_read_snr,
    .read_ucblocks        = au8522_read_ucblocks,
    .release              = au8522_release,
};

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable verbose debug messages");

MODULE_DESCRIPTION("Auvitek AU8522 QAM-B/ATSC Demodulator driver");
MODULE_AUTHOR("Steven Toth");
MODULE_LICENSE("GPL");