[media] DVB: add MaxLinear MxL111SF DVB-T demodulator driver

Signed-off-by: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

4 files changed, 661 insertions, 1 deletions

diff --git a/drivers/media/dvb/dvb-usb/Makefile b/drivers/media/dvb/dvb-usb/Makefile
index 7d0710bb1978..26c8b9e57050 100644
--- a/drivers/media/dvb/dvb-usb/Makefile
+++ b/drivers/media/dvb/dvb-usb/Makefile
@@ -102,6 +102,7 @@ obj-$(CONFIG_DVB_USB_IT913X) += dvb-usb-it913x.o
 
 dvb-usb-mxl111sf-objs = mxl111sf.o mxl111sf-phy.o mxl111sf-i2c.o mxl111sf-gpio.o
 obj-$(CONFIG_DVB_USB_MXL111SF) += dvb-usb-mxl111sf.o
+obj-$(CONFIG_DVB_USB_MXL111SF) += mxl111sf-demod.o
 obj-$(CONFIG_DVB_USB_MXL111SF) += mxl111sf-tuner.o
 
 ccflags-y += -Idrivers/media/dvb/dvb-core/ -Idrivers/media/dvb/frontends/
diff --git a/drivers/media/dvb/dvb-usb/mxl111sf-demod.c b/drivers/media/dvb/dvb-usb/mxl111sf-demod.c
new file mode 100644
index 000000000000..330774e346ab
--- /dev/null
+++ b/drivers/media/dvb/dvb-usb/mxl111sf-demod.c
@@ -0,0 +1,604 @@
+/*
+ *  mxl111sf-demod.c - driver for the MaxLinear MXL111SF DVB-T demodulator
+ *
+ *  Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.com>
+ *
+ *  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 "mxl111sf-demod.h"
+#include "mxl111sf-reg.h"
+
+/* debug */
+static int mxl111sf_demod_debug;
+module_param_named(debug, mxl111sf_demod_debug, int, 0644);
+MODULE_PARM_DESC(debug, "set debugging level (1=info (or-able)).");
+
+#define mxl_dbg(fmt, arg...) \
+        if (mxl111sf_demod_debug) \
+                mxl_printk(KERN_DEBUG, fmt, ##arg)
+
+/* ------------------------------------------------------------------------ */
+
+struct mxl111sf_demod_state {
+        struct mxl111sf_state *mxl_state;
+
+        struct mxl111sf_demod_config *cfg;
+
+        struct dvb_frontend fe;
+};
+
+/* ------------------------------------------------------------------------ */
+
+static int mxl111sf_demod_read_reg(struct mxl111sf_demod_state *state,
+                                   u8 addr, u8 *data)
+{
+        return (state->cfg->read_reg) ?
+                state->cfg->read_reg(state->mxl_state, addr, data) :
+                -EINVAL;
+}
+
+static int mxl111sf_demod_write_reg(struct mxl111sf_demod_state *state,
+                                    u8 addr, u8 data)
+{
+        return (state->cfg->write_reg) ?
+                state->cfg->write_reg(state->mxl_state, addr, data) :
+                -EINVAL;
+}
+
+static
+int mxl111sf_demod_program_regs(struct mxl111sf_demod_state *state,
+                                struct mxl111sf_reg_ctrl_info *ctrl_reg_info)
+{
+        return (state->cfg->program_regs) ?
+                state->cfg->program_regs(state->mxl_state, ctrl_reg_info) :
+                -EINVAL;
+}
+
+/* ------------------------------------------------------------------------ */
+/* TPS */
+
+static
+int mxl1x1sf_demod_get_tps_code_rate(struct mxl111sf_demod_state *state,
+                                     fe_code_rate_t *code_rate)
+{
+        u8 val;
+        int ret = mxl111sf_demod_read_reg(state, V6_CODE_RATE_TPS_REG, &val);
+        /* bit<2:0> - 000:1/2, 001:2/3, 010:3/4, 011:5/6, 100:7/8 */
+        if (mxl_fail(ret))
+                goto fail;
+
+        switch (val & V6_CODE_RATE_TPS_MASK) {
+        case 0:
+                *code_rate = FEC_1_2;
+                break;
+        case 1:
+                *code_rate = FEC_2_3;
+                break;
+        case 2:
+                *code_rate = FEC_3_4;
+                break;
+        case 3:
+                *code_rate = FEC_5_6;
+                break;
+        case 4:
+                *code_rate = FEC_7_8;
+                break;
+        }
+fail:
+        return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_constellation(struct mxl111sf_demod_state *state,
+                                         fe_modulation_t *constellation)
+{
+        u8 val;
+        int ret = mxl111sf_demod_read_reg(state, V6_MODORDER_TPS_REG, &val);
+        /* Constellation, 00 : QPSK, 01 : 16QAM, 10:64QAM */
+        if (mxl_fail(ret))
+                goto fail;
+
+        switch ((val & V6_PARAM_CONSTELLATION_MASK) >> 4) {
+        case 0:
+                *constellation = QPSK;
+                break;
+        case 1:
+                *constellation = QAM_16;
+                break;
+        case 2:
+                *constellation = QAM_64;
+                break;
+        }
+fail:
+        return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_guard_fft_mode(struct mxl111sf_demod_state *state,
+                                          fe_transmit_mode_t *fft_mode)
+{
+        u8 val;
+        int ret = mxl111sf_demod_read_reg(state, V6_MODE_TPS_REG, &val);
+        /* FFT Mode, 00:2K, 01:8K, 10:4K */
+        if (mxl_fail(ret))
+                goto fail;
+
+        switch ((val & V6_PARAM_FFT_MODE_MASK) >> 2) {
+        case 0:
+                *fft_mode = TRANSMISSION_MODE_2K;
+                break;
+        case 1:
+                *fft_mode = TRANSMISSION_MODE_8K;
+                break;
+        case 2:
+                *fft_mode = TRANSMISSION_MODE_4K;
+                break;
+        }
+fail:
+        return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_guard_interval(struct mxl111sf_demod_state *state,
+                                          fe_guard_interval_t *guard)
+{
+        u8 val;
+        int ret = mxl111sf_demod_read_reg(state, V6_CP_TPS_REG, &val);
+        /* 00:1/32, 01:1/16, 10:1/8, 11:1/4 */
+        if (mxl_fail(ret))
+                goto fail;
+
+        switch ((val & V6_PARAM_GI_MASK) >> 4) {
+        case 0:
+                *guard = GUARD_INTERVAL_1_32;
+                break;
+        case 1:
+                *guard = GUARD_INTERVAL_1_16;
+                break;
+        case 2:
+                *guard = GUARD_INTERVAL_1_8;
+                break;
+        case 3:
+                *guard = GUARD_INTERVAL_1_4;
+                break;
+        }
+fail:
+        return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_hierarchy(struct mxl111sf_demod_state *state,
+                                     fe_hierarchy_t *hierarchy)
+{
+        u8 val;
+        int ret = mxl111sf_demod_read_reg(state, V6_TPS_HIERACHY_REG, &val);
+        /* bit<6:4> - 000:Non hierarchy, 001:1, 010:2, 011:4 */
+        if (mxl_fail(ret))
+                goto fail;
+
+        switch ((val & V6_TPS_HIERARCHY_INFO_MASK) >> 6) {
+        case 0:
+                *hierarchy = HIERARCHY_NONE;
+                break;
+        case 1:
+                *hierarchy = HIERARCHY_1;
+                break;
+        case 2:
+                *hierarchy = HIERARCHY_2;
+                break;
+        case 3:
+                *hierarchy = HIERARCHY_4;
+                break;
+        }
+fail:
+        return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+/* LOCKS */
+
+static
+int mxl1x1sf_demod_get_sync_lock_status(struct mxl111sf_demod_state *state,
+                                        int *sync_lock)
+{
+        u8 val = 0;
+        int ret = mxl111sf_demod_read_reg(state, V6_SYNC_LOCK_REG, &val);
+        if (mxl_fail(ret))
+                goto fail;
+        *sync_lock = (val & SYNC_LOCK_MASK) >> 4;
+fail:
+        return ret;
+}
+
+static
+int mxl1x1sf_demod_get_rs_lock_status(struct mxl111sf_demod_state *state,
+                                      int *rs_lock)
+{
+        u8 val = 0;
+        int ret = mxl111sf_demod_read_reg(state, V6_RS_LOCK_DET_REG, &val);
+        if (mxl_fail(ret))
+                goto fail;
+        *rs_lock = (val & RS_LOCK_DET_MASK) >> 3;
+fail:
+        return ret;
+}
+
+static
+int mxl1x1sf_demod_get_tps_lock_status(struct mxl111sf_demod_state *state,
+                                       int *tps_lock)
+{
+        u8 val = 0;
+        int ret = mxl111sf_demod_read_reg(state, V6_TPS_LOCK_REG, &val);
+        if (mxl_fail(ret))
+                goto fail;
+        *tps_lock = (val & V6_PARAM_TPS_LOCK_MASK) >> 6;
+fail:
+        return ret;
+}
+
+static
+int mxl1x1sf_demod_get_fec_lock_status(struct mxl111sf_demod_state *state,
+                                       int *fec_lock)
+{
+        u8 val = 0;
+        int ret = mxl111sf_demod_read_reg(state, V6_IRQ_STATUS_REG, &val);
+        if (mxl_fail(ret))
+                goto fail;
+        *fec_lock = (val & IRQ_MASK_FEC_LOCK) >> 4;
+fail:
+        return ret;
+}
+
+#if 0
+static
+int mxl1x1sf_demod_get_cp_lock_status(struct mxl111sf_demod_state *state,
+                                      int *cp_lock)
+{
+        u8 val = 0;
+        int ret = mxl111sf_demod_read_reg(state, V6_CP_LOCK_DET_REG, &val);
+        if (mxl_fail(ret))
+                goto fail;
+        *cp_lock = (val & V6_CP_LOCK_DET_MASK) >> 2;
+fail:
+        return ret;
+}
+#endif
+
+static int mxl1x1sf_demod_reset_irq_status(struct mxl111sf_demod_state *state)
+{
+        return mxl111sf_demod_write_reg(state, 0x0e, 0xff);
+}
+
+/* ------------------------------------------------------------------------ */
+
+static int mxl111sf_demod_set_frontend(struct dvb_frontend *fe,
+                                       struct dvb_frontend_parameters *param)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+        int ret = 0;
+
+        struct mxl111sf_reg_ctrl_info phy_pll_patch[] = {
+                {0x00, 0xff, 0x01}, /* change page to 1 */
+                {0x40, 0xff, 0x05},
+                {0x40, 0xff, 0x01},
+                {0x41, 0xff, 0xca},
+                {0x41, 0xff, 0xc0},
+                {0x00, 0xff, 0x00}, /* change page to 0 */
+                {0,    0,    0}
+        };
+
+        mxl_dbg("()");
+
+        if (fe->ops.tuner_ops.set_params) {
+                ret = fe->ops.tuner_ops.set_params(fe, param);
+                if (mxl_fail(ret))
+                        goto fail;
+                msleep(50);
+        }
+        ret = mxl111sf_demod_program_regs(state, phy_pll_patch);
+        mxl_fail(ret);
+        msleep(50);
+        ret = mxl1x1sf_demod_reset_irq_status(state);
+        mxl_fail(ret);
+        msleep(100);
+fail:
+        return ret;
+}
+
+/* ------------------------------------------------------------------------ */
+
+#if 0
+/* resets TS Packet error count */
+/* After setting 7th bit of V5_PER_COUNT_RESET_REG, it should be reset to 0. */
+static
+int mxl1x1sf_demod_reset_packet_error_count(struct mxl111sf_demod_state *state)
+{
+        struct mxl111sf_reg_ctrl_info reset_per_count[] = {
+                {0x20, 0x01, 0x01},
+                {0x20, 0x01, 0x00},
+                {0,    0,    0}
+        };
+        return mxl111sf_demod_program_regs(state, reset_per_count);
+}
+#endif
+
+/* returns TS Packet error count */
+/* PER Count = FEC_PER_COUNT * (2 ** (FEC_PER_SCALE * 4)) */
+static int mxl111sf_demod_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+        u32 fec_per_count, fec_per_scale;
+        u8 val;
+        int ret;
+
+        *ucblocks = 0;
+
+        /* FEC_PER_COUNT Register */
+        ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_COUNT_REG, &val);
+        if (mxl_fail(ret))
+                goto fail;
+
+        fec_per_count = val;
+
+        /* FEC_PER_SCALE Register */
+        ret = mxl111sf_demod_read_reg(state, V6_FEC_PER_SCALE_REG, &val);
+        if (mxl_fail(ret))
+                goto fail;
+
+        val &= V6_FEC_PER_SCALE_MASK;
+        val *= 4;
+
+        fec_per_scale = 1 << val;
+
+        fec_per_count *= fec_per_scale;
+
+        *ucblocks = fec_per_count;
+fail:
+        return ret;
+}
+
+#define CALCULATE_BER(avg_errors, count) \
+        ((u32)(avg_errors * 4)/(count*64*188*8))
+#define CALCULATE_SNR(data) \
+        ((u32)((10 * (u32)data / 64) - 2.5))
+
+static int mxl111sf_demod_read_ber(struct dvb_frontend *fe, u32 *ber)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+        u8 val1, val2, val3;
+        int ret;
+
+        *ber = 0;
+
+        ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_LSB_REG, &val1);
+        if (mxl_fail(ret))
+                goto fail;
+        ret = mxl111sf_demod_read_reg(state, V6_RS_AVG_ERRORS_MSB_REG, &val2);
+        if (mxl_fail(ret))
+                goto fail;
+        ret = mxl111sf_demod_read_reg(state, V6_N_ACCUMULATE_REG, &val3);
+        if (mxl_fail(ret))
+                goto fail;
+
+        *ber = CALCULATE_BER((val1 | (val2 << 8)), val3);
+fail:
+        return ret;
+}
+
+static int mxl111sf_demod_calc_snr(struct mxl111sf_demod_state *state,
+                                   u16 *snr)
+{
+        u8 val1, val2;
+        int ret;
+
+        *snr = 0;
+
+        ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_LSB_REG, &val1);
+        if (mxl_fail(ret))
+                goto fail;
+        ret = mxl111sf_demod_read_reg(state, V6_SNR_RB_MSB_REG, &val2);
+        if (mxl_fail(ret))
+                goto fail;
+
+        *snr = CALCULATE_SNR(val1 | ((val2 & 0x03) << 8));
+fail:
+        return ret;
+}
+
+static int mxl111sf_demod_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+
+        int ret = mxl111sf_demod_calc_snr(state, snr);
+        if (mxl_fail(ret))
+                goto fail;
+
+        *snr /= 10; /* 0.1 dB */
+fail:
+        return ret;
+}
+
+static int mxl111sf_demod_read_status(struct dvb_frontend *fe,
+                                      fe_status_t *status)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+        int ret, locked, cr_lock, sync_lock, fec_lock;
+
+        *status = 0;
+
+        ret = mxl1x1sf_demod_get_rs_lock_status(state, &locked);
+        if (mxl_fail(ret))
+                goto fail;
+        ret = mxl1x1sf_demod_get_tps_lock_status(state, &cr_lock);
+        if (mxl_fail(ret))
+                goto fail;
+        ret = mxl1x1sf_demod_get_sync_lock_status(state, &sync_lock);
+        if (mxl_fail(ret))
+                goto fail;
+        ret = mxl1x1sf_demod_get_fec_lock_status(state, &fec_lock);
+        if (mxl_fail(ret))
+                goto fail;
+
+        if (locked)
+                *status |= FE_HAS_SIGNAL;
+        if (cr_lock)
+                *status |= FE_HAS_CARRIER;
+        if (sync_lock)
+                *status |= FE_HAS_SYNC;
+        if (fec_lock) /* false positives? */
+                *status |= FE_HAS_VITERBI;
+
+        if ((locked) && (cr_lock) && (sync_lock))
+                *status |= FE_HAS_LOCK;
+fail:
+        return ret;
+}
+
+static int mxl111sf_demod_read_signal_strength(struct dvb_frontend *fe,
+                                               u16 *signal_strength)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+        fe_modulation_t constellation;
+        u16 snr;
+
+        mxl111sf_demod_calc_snr(state, &snr);
+        mxl1x1sf_demod_get_tps_constellation(state, &constellation);
+
+        switch (constellation) {
+        case QPSK:
+                *signal_strength = (snr >= 1300) ?
+                        min(65535, snr * 44) : snr * 38;
+                break;
+        case QAM_16:
+                *signal_strength = (snr >= 1500) ?
+                        min(65535, snr * 38) : snr * 33;
+                break;
+        case QAM_64:
+                *signal_strength = (snr >= 2000) ?
+                        min(65535, snr * 29) : snr * 25;
+                break;
+        default:
+                *signal_strength = 0;
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int mxl111sf_demod_get_frontend(struct dvb_frontend *fe,
+                                       struct dvb_frontend_parameters *p)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+
+        mxl_dbg("()");
+#if 0
+        p->inversion = /* FIXME */ ? INVERSION_ON : INVERSION_OFF;
+#endif
+        if (fe->ops.tuner_ops.get_bandwidth)
+                fe->ops.tuner_ops.get_bandwidth(fe, &p->u.ofdm.bandwidth);
+        if (fe->ops.tuner_ops.get_frequency)
+                fe->ops.tuner_ops.get_frequency(fe, &p->frequency);
+        mxl1x1sf_demod_get_tps_code_rate(state, &p->u.ofdm.code_rate_HP);
+        mxl1x1sf_demod_get_tps_code_rate(state, &p->u.ofdm.code_rate_LP);
+        mxl1x1sf_demod_get_tps_constellation(state, &p->u.ofdm.constellation);
+        mxl1x1sf_demod_get_tps_guard_fft_mode(state,
+                                              &p->u.ofdm.transmission_mode);
+        mxl1x1sf_demod_get_tps_guard_interval(state,
+                                              &p->u.ofdm.guard_interval);
+        mxl1x1sf_demod_get_tps_hierarchy(state,
+                                         &p->u.ofdm.hierarchy_information);
+
+        return 0;
+}
+
+static
+int mxl111sf_demod_get_tune_settings(struct dvb_frontend *fe,
+                                     struct dvb_frontend_tune_settings *tune)
+{
+        tune->min_delay_ms = 1000;
+        return 0;
+}
+
+static void mxl111sf_demod_release(struct dvb_frontend *fe)
+{
+        struct mxl111sf_demod_state *state = fe->demodulator_priv;
+        mxl_dbg("()");
+        kfree(state);
+        fe->demodulator_priv = NULL;
+}
+
+static struct dvb_frontend_ops mxl111sf_demod_ops = {
+
+        .info = {
+                .name                   = "MxL111SF DVB-T",
+                .type                   = FE_OFDM,
+                .frequency_min          = 177000000,
+                .frequency_max          = 858000000,
+                .frequency_stepsize     = 166666,
+                .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
+                        FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
+                        FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
+                        FE_CAN_QAM_AUTO |
+                        FE_CAN_HIERARCHY_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
+                        FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_RECOVER
+        },
+        .release              = mxl111sf_demod_release,
+#if 0
+        .init                 = mxl111sf_init,
+        .i2c_gate_ctrl        = mxl111sf_i2c_gate_ctrl,
+#endif
+        .set_frontend         = mxl111sf_demod_set_frontend,
+        .get_frontend         = mxl111sf_demod_get_frontend,
+        .get_tune_settings    = mxl111sf_demod_get_tune_settings,
+        .read_status          = mxl111sf_demod_read_status,
+        .read_signal_strength = mxl111sf_demod_read_signal_strength,
+        .read_ber             = mxl111sf_demod_read_ber,
+        .read_snr             = mxl111sf_demod_read_snr,
+        .read_ucblocks        = mxl111sf_demod_read_ucblocks,
+};
+
+struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
+                                           struct mxl111sf_demod_config *cfg)
+{
+        struct mxl111sf_demod_state *state = NULL;
+
+        mxl_dbg("()");
+
+        state = kzalloc(sizeof(struct mxl111sf_demod_state), GFP_KERNEL);
+        if (state == NULL)
+                return NULL;
+
+        state->mxl_state = mxl_state;
+        state->cfg = cfg;
+
+        memcpy(&state->fe.ops, &mxl111sf_demod_ops,
+               sizeof(struct dvb_frontend_ops));
+
+        state->fe.demodulator_priv = state;
+        return &state->fe;
+}
+EXPORT_SYMBOL_GPL(mxl111sf_demod_attach);
+
+MODULE_DESCRIPTION("MaxLinear MxL111SF DVB-T demodulator driver");
+MODULE_AUTHOR("Michael Krufky <mkrufky@kernellabs.com>");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1");
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
diff --git a/drivers/media/dvb/dvb-usb/mxl111sf-demod.h b/drivers/media/dvb/dvb-usb/mxl111sf-demod.h
new file mode 100644
index 000000000000..432706ae5274
--- /dev/null
+++ b/drivers/media/dvb/dvb-usb/mxl111sf-demod.h
@@ -0,0 +1,55 @@
+/*
+ *  mxl111sf-demod.h - driver for the MaxLinear MXL111SF DVB-T demodulator
+ *
+ *  Copyright (C) 2010 Michael Krufky <mkrufky@kernellabs.com>
+ *
+ *  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.
+ */
+
+#ifndef __MXL111SF_DEMOD_H__
+#define __MXL111SF_DEMOD_H__
+
+#include "dvb_frontend.h"
+#include "mxl111sf.h"
+
+struct mxl111sf_demod_config {
+        int (*read_reg)(struct mxl111sf_state *state, u8 addr, u8 *data);
+        int (*write_reg)(struct mxl111sf_state *state, u8 addr, u8 data);
+        int (*program_regs)(struct mxl111sf_state *state,
+                            struct mxl111sf_reg_ctrl_info *ctrl_reg_info);
+};
+
+#if defined(CONFIG_DVB_USB_MXL111SF) || \
+        (defined(CONFIG_DVB_USB_MXL111SF_MODULE) && defined(MODULE))
+extern
+struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
+                                           struct mxl111sf_demod_config *cfg);
+#else
+static inline
+struct dvb_frontend *mxl111sf_demod_attach(struct mxl111sf_state *mxl_state,
+                                           struct mxl111sf_demod_config *cfg)
+{
+        printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
+        return NULL;
+}
+#endif /* CONFIG_DVB_USB_MXL111SF */
+
+#endif /* __MXL111SF_DEMOD_H__ */
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
diff --git a/drivers/media/dvb/dvb-usb/mxl111sf.h b/drivers/media/dvb/dvb-usb/mxl111sf.h
index 5a2c7bb386cd..364d89f826bd 100644
--- a/drivers/media/dvb/dvb-usb/mxl111sf.h
+++ b/drivers/media/dvb/dvb-usb/mxl111sf.h
@@ -133,7 +133,7 @@ extern int dvb_usb_mxl111sf_debug;
 /* The following allows the mxl_fail() macro defined below to work
  * in externel modules, such as mxl111sf-tuner.ko, even though
  * dvb_usb_mxl111sf_debug is not defined within those modules */
-#ifdef __MXL111SF_TUNER_H__
+#if (defined(__MXL111SF_TUNER_H__)) || (defined(__MXL111SF_DEMOD_H__))
 #define MXL_ADV_DEBUG_ENABLED MXL_ADV_DBG
 #else
 #define MXL_ADV_DEBUG_ENABLED dvb_usb_mxl111sf_debug