1 files changed, 735 insertions, 0 deletions

diff --git a/drivers/media/dvb/pt1/va1j5jf8007s.c b/drivers/media/dvb/pt1/va1j5jf8007s.c
new file mode 100644
index 00000000000..451641c0c1d
--- /dev/null
+++ b/drivers/media/dvb/pt1/va1j5jf8007s.c
@@ -0,0 +1,735 @@
+/*
+ * ISDB-S driver for VA1J5JF8007/VA1J5JF8011
+ *
+ * Copyright (C) 2009 HIRANO Takahito <hiranotaka@zng.info>
+ *
+ * based on pt1dvr - http://pt1dvr.sourceforge.jp/
+ *      by Tomoaki Ishikawa <tomy@users.sourceforge.jp>
+ *
+ * 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/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include "dvb_frontend.h"
+#include "va1j5jf8007s.h"
+
+enum va1j5jf8007s_tune_state {
+        VA1J5JF8007S_IDLE,
+        VA1J5JF8007S_SET_FREQUENCY_1,
+        VA1J5JF8007S_SET_FREQUENCY_2,
+        VA1J5JF8007S_SET_FREQUENCY_3,
+        VA1J5JF8007S_CHECK_FREQUENCY,
+        VA1J5JF8007S_SET_MODULATION,
+        VA1J5JF8007S_CHECK_MODULATION,
+        VA1J5JF8007S_SET_TS_ID,
+        VA1J5JF8007S_CHECK_TS_ID,
+        VA1J5JF8007S_TRACK,
+};
+
+struct va1j5jf8007s_state {
+        const struct va1j5jf8007s_config *config;
+        struct i2c_adapter *adap;
+        struct dvb_frontend fe;
+        enum va1j5jf8007s_tune_state tune_state;
+};
+
+static int va1j5jf8007s_read_snr(struct dvb_frontend *fe, u16 *snr)
+{
+        struct va1j5jf8007s_state *state;
+        u8 addr;
+        int i;
+        u8 write_buf[1], read_buf[1];
+        struct i2c_msg msgs[2];
+        s32 word, x1, x2, x3, x4, x5, y;
+
+        state = fe->demodulator_priv;
+        addr = state->config->demod_address;
+
+        word = 0;
+        for (i = 0; i < 2; i++) {
+                write_buf[0] = 0xbc + i;
+
+                msgs[0].addr = addr;
+                msgs[0].flags = 0;
+                msgs[0].len = sizeof(write_buf);
+                msgs[0].buf = write_buf;
+
+                msgs[1].addr = addr;
+                msgs[1].flags = I2C_M_RD;
+                msgs[1].len = sizeof(read_buf);
+                msgs[1].buf = read_buf;
+
+                if (i2c_transfer(state->adap, msgs, 2) != 2)
+                        return -EREMOTEIO;
+
+                word <<= 8;
+                word |= read_buf[0];
+        }
+
+        word -= 3000;
+        if (word < 0)
+                word = 0;
+
+        x1 = int_sqrt(word << 16) * ((15625ll << 21) / 1000000);
+        x2 = (s64)x1 * x1 >> 31;
+        x3 = (s64)x2 * x1 >> 31;
+        x4 = (s64)x2 * x2 >> 31;
+        x5 = (s64)x4 * x1 >> 31;
+
+        y = (58857ll << 23) / 1000;
+        y -= (s64)x1 * ((89565ll << 24) / 1000) >> 30;
+        y += (s64)x2 * ((88977ll << 24) / 1000) >> 28;
+        y -= (s64)x3 * ((50259ll << 25) / 1000) >> 27;
+        y += (s64)x4 * ((14341ll << 27) / 1000) >> 27;
+        y -= (s64)x5 * ((16346ll << 30) / 10000) >> 28;
+
+        *snr = y < 0 ? 0 : y >> 15;
+        return 0;
+}
+
+static int va1j5jf8007s_get_frontend_algo(struct dvb_frontend *fe)
+{
+        return DVBFE_ALGO_HW;
+}
+
+static int
+va1j5jf8007s_read_status(struct dvb_frontend *fe, fe_status_t *status)
+{
+        struct va1j5jf8007s_state *state;
+
+        state = fe->demodulator_priv;
+
+        switch (state->tune_state) {
+        case VA1J5JF8007S_IDLE:
+        case VA1J5JF8007S_SET_FREQUENCY_1:
+        case VA1J5JF8007S_SET_FREQUENCY_2:
+        case VA1J5JF8007S_SET_FREQUENCY_3:
+        case VA1J5JF8007S_CHECK_FREQUENCY:
+                *status = 0;
+                return 0;
+
+
+        case VA1J5JF8007S_SET_MODULATION:
+        case VA1J5JF8007S_CHECK_MODULATION:
+                *status |= FE_HAS_SIGNAL;
+                return 0;
+
+        case VA1J5JF8007S_SET_TS_ID:
+        case VA1J5JF8007S_CHECK_TS_ID:
+                *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER;
+                return 0;
+
+        case VA1J5JF8007S_TRACK:
+                *status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
+                return 0;
+        }
+
+        BUG();
+}
+
+struct va1j5jf8007s_cb_map {
+        u32 frequency;
+        u8 cb;
+};
+
+static const struct va1j5jf8007s_cb_map va1j5jf8007s_cb_maps[] = {
+        {  986000, 0xb2 },
+        { 1072000, 0xd2 },
+        { 1154000, 0xe2 },
+        { 1291000, 0x20 },
+        { 1447000, 0x40 },
+        { 1615000, 0x60 },
+        { 1791000, 0x80 },
+        { 1972000, 0xa0 },
+};
+
+static u8 va1j5jf8007s_lookup_cb(u32 frequency)
+{
+        int i;
+        const struct va1j5jf8007s_cb_map *map;
+
+        for (i = 0; i < ARRAY_SIZE(va1j5jf8007s_cb_maps); i++) {
+                map = &va1j5jf8007s_cb_maps[i];
+                if (frequency < map->frequency)
+                        return map->cb;
+        }
+        return 0xc0;
+}
+
+static int va1j5jf8007s_set_frequency_1(struct va1j5jf8007s_state *state)
+{
+        u32 frequency;
+        u16 word;
+        u8 buf[6];
+        struct i2c_msg msg;
+
+        frequency = state->fe.dtv_property_cache.frequency;
+
+        word = (frequency + 500) / 1000;
+        if (frequency < 1072000)
+                word = (word << 1 & ~0x1f) | (word & 0x0f);
+
+        buf[0] = 0xfe;
+        buf[1] = 0xc0;
+        buf[2] = 0x40 | word >> 8;
+        buf[3] = word;
+        buf[4] = 0xe0;
+        buf[5] = va1j5jf8007s_lookup_cb(frequency);
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1)
+                return -EREMOTEIO;
+
+        return 0;
+}
+
+static int va1j5jf8007s_set_frequency_2(struct va1j5jf8007s_state *state)
+{
+        u8 buf[3];
+        struct i2c_msg msg;
+
+        buf[0] = 0xfe;
+        buf[1] = 0xc0;
+        buf[2] = 0xe4;
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1)
+                return -EREMOTEIO;
+
+        return 0;
+}
+
+static int va1j5jf8007s_set_frequency_3(struct va1j5jf8007s_state *state)
+{
+        u32 frequency;
+        u8 buf[4];
+        struct i2c_msg msg;
+
+        frequency = state->fe.dtv_property_cache.frequency;
+
+        buf[0] = 0xfe;
+        buf[1] = 0xc0;
+        buf[2] = 0xf4;
+        buf[3] = va1j5jf8007s_lookup_cb(frequency) | 0x4;
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1)
+                return -EREMOTEIO;
+
+        return 0;
+}
+
+static int
+va1j5jf8007s_check_frequency(struct va1j5jf8007s_state *state, int *lock)
+{
+        u8 addr;
+        u8 write_buf[2], read_buf[1];
+        struct i2c_msg msgs[2];
+
+        addr = state->config->demod_address;
+
+        write_buf[0] = 0xfe;
+        write_buf[1] = 0xc1;
+
+        msgs[0].addr = addr;
+        msgs[0].flags = 0;
+        msgs[0].len = sizeof(write_buf);
+        msgs[0].buf = write_buf;
+
+        msgs[1].addr = addr;
+        msgs[1].flags = I2C_M_RD;
+        msgs[1].len = sizeof(read_buf);
+        msgs[1].buf = read_buf;
+
+        if (i2c_transfer(state->adap, msgs, 2) != 2)
+                return -EREMOTEIO;
+
+        *lock = read_buf[0] & 0x40;
+        return 0;
+}
+
+static int va1j5jf8007s_set_modulation(struct va1j5jf8007s_state *state)
+{
+        u8 buf[2];
+        struct i2c_msg msg;
+
+        buf[0] = 0x03;
+        buf[1] = 0x01;
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1)
+                return -EREMOTEIO;
+
+        return 0;
+}
+
+static int
+va1j5jf8007s_check_modulation(struct va1j5jf8007s_state *state, int *lock)
+{
+        u8 addr;
+        u8 write_buf[1], read_buf[1];
+        struct i2c_msg msgs[2];
+
+        addr = state->config->demod_address;
+
+        write_buf[0] = 0xc3;
+
+        msgs[0].addr = addr;
+        msgs[0].flags = 0;
+        msgs[0].len = sizeof(write_buf);
+        msgs[0].buf = write_buf;
+
+        msgs[1].addr = addr;
+        msgs[1].flags = I2C_M_RD;
+        msgs[1].len = sizeof(read_buf);
+        msgs[1].buf = read_buf;
+
+        if (i2c_transfer(state->adap, msgs, 2) != 2)
+                return -EREMOTEIO;
+
+        *lock = !(read_buf[0] & 0x10);
+        return 0;
+}
+
+static int
+va1j5jf8007s_set_ts_id(struct va1j5jf8007s_state *state)
+{
+        u32 ts_id;
+        u8 buf[3];
+        struct i2c_msg msg;
+
+        ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
+        if (!ts_id)
+                return 0;
+
+        buf[0] = 0x8f;
+        buf[1] = ts_id >> 8;
+        buf[2] = ts_id;
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1)
+                return -EREMOTEIO;
+
+        return 0;
+}
+
+static int
+va1j5jf8007s_check_ts_id(struct va1j5jf8007s_state *state, int *lock)
+{
+        u8 addr;
+        u8 write_buf[1], read_buf[2];
+        struct i2c_msg msgs[2];
+        u32 ts_id;
+
+        ts_id = state->fe.dtv_property_cache.isdbs_ts_id;
+        if (!ts_id) {
+                *lock = 1;
+                return 0;
+        }
+
+        addr = state->config->demod_address;
+
+        write_buf[0] = 0xe6;
+
+        msgs[0].addr = addr;
+        msgs[0].flags = 0;
+        msgs[0].len = sizeof(write_buf);
+        msgs[0].buf = write_buf;
+
+        msgs[1].addr = addr;
+        msgs[1].flags = I2C_M_RD;
+        msgs[1].len = sizeof(read_buf);
+        msgs[1].buf = read_buf;
+
+        if (i2c_transfer(state->adap, msgs, 2) != 2)
+                return -EREMOTEIO;
+
+        *lock = (read_buf[0] << 8 | read_buf[1]) == ts_id;
+        return 0;
+}
+
+static int
+va1j5jf8007s_tune(struct dvb_frontend *fe,
+                  struct dvb_frontend_parameters *params,
+                  unsigned int mode_flags,  unsigned int *delay,
+                  fe_status_t *status)
+{
+        struct va1j5jf8007s_state *state;
+        int ret;
+        int lock = 0;
+
+        state = fe->demodulator_priv;
+
+        if (params != NULL)
+                state->tune_state = VA1J5JF8007S_SET_FREQUENCY_1;
+
+        switch (state->tune_state) {
+        case VA1J5JF8007S_IDLE:
+                *delay = 3 * HZ;
+                *status = 0;
+                return 0;
+
+        case VA1J5JF8007S_SET_FREQUENCY_1:
+                ret = va1j5jf8007s_set_frequency_1(state);
+                if (ret < 0)
+                        return ret;
+
+                state->tune_state = VA1J5JF8007S_SET_FREQUENCY_2;
+                *delay = 0;
+                *status = 0;
+                return 0;
+
+        case VA1J5JF8007S_SET_FREQUENCY_2:
+                ret = va1j5jf8007s_set_frequency_2(state);
+                if (ret < 0)
+                        return ret;
+
+                state->tune_state = VA1J5JF8007S_SET_FREQUENCY_3;
+                *delay = (HZ + 99) / 100;
+                *status = 0;
+                return 0;
+
+        case VA1J5JF8007S_SET_FREQUENCY_3:
+                ret = va1j5jf8007s_set_frequency_3(state);
+                if (ret < 0)
+                        return ret;
+
+                state->tune_state = VA1J5JF8007S_CHECK_FREQUENCY;
+                *delay = 0;
+                *status = 0;
+                return 0;
+
+        case VA1J5JF8007S_CHECK_FREQUENCY:
+                ret = va1j5jf8007s_check_frequency(state, &lock);
+                if (ret < 0)
+                        return ret;
+
+                if (!lock)  {
+                        *delay = (HZ + 999) / 1000;
+                        *status = 0;
+                        return 0;
+                }
+
+                state->tune_state = VA1J5JF8007S_SET_MODULATION;
+                *delay = 0;
+                *status = FE_HAS_SIGNAL;
+                return 0;
+
+        case VA1J5JF8007S_SET_MODULATION:
+                ret = va1j5jf8007s_set_modulation(state);
+                if (ret < 0)
+                        return ret;
+
+                state->tune_state = VA1J5JF8007S_CHECK_MODULATION;
+                *delay = 0;
+                *status = FE_HAS_SIGNAL;
+                return 0;
+
+        case VA1J5JF8007S_CHECK_MODULATION:
+                ret = va1j5jf8007s_check_modulation(state, &lock);
+                if (ret < 0)
+                        return ret;
+
+                if (!lock)  {
+                        *delay = (HZ + 49) / 50;
+                        *status = FE_HAS_SIGNAL;
+                        return 0;
+                }
+
+                state->tune_state = VA1J5JF8007S_SET_TS_ID;
+                *delay = 0;
+                *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
+                return 0;
+
+        case VA1J5JF8007S_SET_TS_ID:
+                ret = va1j5jf8007s_set_ts_id(state);
+                if (ret < 0)
+                        return ret;
+
+                state->tune_state = VA1J5JF8007S_CHECK_TS_ID;
+                return 0;
+
+        case VA1J5JF8007S_CHECK_TS_ID:
+                ret = va1j5jf8007s_check_ts_id(state, &lock);
+                if (ret < 0)
+                        return ret;
+
+                if (!lock)  {
+                        *delay = (HZ + 99) / 100;
+                        *status = FE_HAS_SIGNAL | FE_HAS_CARRIER;
+                        return 0;
+                }
+
+                state->tune_state = VA1J5JF8007S_TRACK;
+                /* fall through */
+
+        case VA1J5JF8007S_TRACK:
+                *delay = 3 * HZ;
+                *status = FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_LOCK;
+                return 0;
+        }
+
+        BUG();
+}
+
+static int va1j5jf8007s_init_frequency(struct va1j5jf8007s_state *state)
+{
+        u8 buf[4];
+        struct i2c_msg msg;
+
+        buf[0] = 0xfe;
+        buf[1] = 0xc0;
+        buf[2] = 0xf0;
+        buf[3] = 0x04;
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1)
+                return -EREMOTEIO;
+
+        return 0;
+}
+
+static int va1j5jf8007s_set_sleep(struct va1j5jf8007s_state *state, int sleep)
+{
+        u8 buf[2];
+        struct i2c_msg msg;
+
+        buf[0] = 0x17;
+        buf[1] = sleep ? 0x01 : 0x00;
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1)
+                return -EREMOTEIO;
+
+        return 0;
+}
+
+static int va1j5jf8007s_sleep(struct dvb_frontend *fe)
+{
+        struct va1j5jf8007s_state *state;
+        int ret;
+
+        state = fe->demodulator_priv;
+
+        ret = va1j5jf8007s_init_frequency(state);
+        if (ret < 0)
+                return ret;
+
+        return va1j5jf8007s_set_sleep(state, 1);
+}
+
+static int va1j5jf8007s_init(struct dvb_frontend *fe)
+{
+        struct va1j5jf8007s_state *state;
+
+        state = fe->demodulator_priv;
+        state->tune_state = VA1J5JF8007S_IDLE;
+
+        return va1j5jf8007s_set_sleep(state, 0);
+}
+
+static void va1j5jf8007s_release(struct dvb_frontend *fe)
+{
+        struct va1j5jf8007s_state *state;
+        state = fe->demodulator_priv;
+        kfree(state);
+}
+
+static struct dvb_frontend_ops va1j5jf8007s_ops = {
+        .info = {
+                .name = "VA1J5JF8007/VA1J5JF8011 ISDB-S",
+                .type = FE_QPSK,
+                .frequency_min = 950000,
+                .frequency_max = 2150000,
+                .frequency_stepsize = 1000,
+                .caps = FE_CAN_INVERSION_AUTO | FE_CAN_FEC_AUTO |
+                        FE_CAN_QAM_AUTO | FE_CAN_TRANSMISSION_MODE_AUTO |
+                        FE_CAN_GUARD_INTERVAL_AUTO | FE_CAN_HIERARCHY_AUTO,
+        },
+
+        .read_snr = va1j5jf8007s_read_snr,
+        .get_frontend_algo = va1j5jf8007s_get_frontend_algo,
+        .read_status = va1j5jf8007s_read_status,
+        .tune = va1j5jf8007s_tune,
+        .sleep = va1j5jf8007s_sleep,
+        .init = va1j5jf8007s_init,
+        .release = va1j5jf8007s_release,
+};
+
+static int va1j5jf8007s_prepare_1(struct va1j5jf8007s_state *state)
+{
+        u8 addr;
+        u8 write_buf[1], read_buf[1];
+        struct i2c_msg msgs[2];
+
+        addr = state->config->demod_address;
+
+        write_buf[0] = 0x07;
+
+        msgs[0].addr = addr;
+        msgs[0].flags = 0;
+        msgs[0].len = sizeof(write_buf);
+        msgs[0].buf = write_buf;
+
+        msgs[1].addr = addr;
+        msgs[1].flags = I2C_M_RD;
+        msgs[1].len = sizeof(read_buf);
+        msgs[1].buf = read_buf;
+
+        if (i2c_transfer(state->adap, msgs, 2) != 2)
+                return -EREMOTEIO;
+
+        if (read_buf[0] != 0x41)
+                return -EIO;
+
+        return 0;
+}
+
+static const u8 va1j5jf8007s_20mhz_prepare_bufs[][2] = {
+        {0x04, 0x02}, {0x0d, 0x55}, {0x11, 0x40}, {0x13, 0x80}, {0x17, 0x01},
+        {0x1c, 0x0a}, {0x1d, 0xaa}, {0x1e, 0x20}, {0x1f, 0x88}, {0x51, 0xb0},
+        {0x52, 0x89}, {0x53, 0xb3}, {0x5a, 0x2d}, {0x5b, 0xd3}, {0x85, 0x69},
+        {0x87, 0x04}, {0x8e, 0x02}, {0xa3, 0xf7}, {0xa5, 0xc0},
+};
+
+static const u8 va1j5jf8007s_25mhz_prepare_bufs[][2] = {
+        {0x04, 0x02}, {0x11, 0x40}, {0x13, 0x80}, {0x17, 0x01}, {0x1c, 0x0a},
+        {0x1d, 0xaa}, {0x1e, 0x20}, {0x1f, 0x88}, {0x51, 0xb0}, {0x52, 0x89},
+        {0x53, 0xb3}, {0x5a, 0x2d}, {0x5b, 0xd3}, {0x85, 0x69}, {0x87, 0x04},
+        {0x8e, 0x26}, {0xa3, 0xf7}, {0xa5, 0xc0},
+};
+
+static int va1j5jf8007s_prepare_2(struct va1j5jf8007s_state *state)
+{
+        const u8 (*bufs)[2];
+        int size;
+        u8 addr;
+        u8 buf[2];
+        struct i2c_msg msg;
+        int i;
+
+        switch (state->config->frequency) {
+        case VA1J5JF8007S_20MHZ:
+                bufs = va1j5jf8007s_20mhz_prepare_bufs;
+                size = ARRAY_SIZE(va1j5jf8007s_20mhz_prepare_bufs);
+                break;
+        case VA1J5JF8007S_25MHZ:
+                bufs = va1j5jf8007s_25mhz_prepare_bufs;
+                size = ARRAY_SIZE(va1j5jf8007s_25mhz_prepare_bufs);
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        addr = state->config->demod_address;
+
+        msg.addr = addr;
+        msg.flags = 0;
+        msg.len = 2;
+        msg.buf = buf;
+        for (i = 0; i < size; i++) {
+                memcpy(buf, bufs[i], sizeof(buf));
+                if (i2c_transfer(state->adap, &msg, 1) != 1)
+                        return -EREMOTEIO;
+        }
+
+        return 0;
+}
+
+/* must be called after va1j5jf8007t_attach */
+int va1j5jf8007s_prepare(struct dvb_frontend *fe)
+{
+        struct va1j5jf8007s_state *state;
+        int ret;
+
+        state = fe->demodulator_priv;
+
+        ret = va1j5jf8007s_prepare_1(state);
+        if (ret < 0)
+                return ret;
+
+        ret = va1j5jf8007s_prepare_2(state);
+        if (ret < 0)
+                return ret;
+
+        return va1j5jf8007s_init_frequency(state);
+}
+
+struct dvb_frontend *
+va1j5jf8007s_attach(const struct va1j5jf8007s_config *config,
+                    struct i2c_adapter *adap)
+{
+        struct va1j5jf8007s_state *state;
+        struct dvb_frontend *fe;
+        u8 buf[2];
+        struct i2c_msg msg;
+
+        state = kzalloc(sizeof(struct va1j5jf8007s_state), GFP_KERNEL);
+        if (!state)
+                return NULL;
+
+        state->config = config;
+        state->adap = adap;
+
+        fe = &state->fe;
+        memcpy(&fe->ops, &va1j5jf8007s_ops, sizeof(struct dvb_frontend_ops));
+        fe->demodulator_priv = state;
+
+        buf[0] = 0x01;
+        buf[1] = 0x80;
+
+        msg.addr = state->config->demod_address;
+        msg.flags = 0;
+        msg.len = sizeof(buf);
+        msg.buf = buf;
+
+        if (i2c_transfer(state->adap, &msg, 1) != 1) {
+                kfree(state);
+                return NULL;
+        }
+
+        return fe;
+}