// SPDX-License-Identifier: GPL-2.0-or-later
/*

   i2c tv tuner chip device driver
   controls the philips tda8290+75 tuner chip combo.


   This "tda8290" module was split apart from the original "tuner" module.
*/

#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/videodev2.h>
#include "tuner-i2c.h"
#include "tda8290.h"
#include "tda827x.h"
#include "tda18271.h"

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

static int deemphasis_50;
module_param(deemphasis_50, int, 0644);
MODULE_PARM_DESC(deemphasis_50, "0 - 75us deemphasis; 1 - 50us deemphasis");

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

struct tda8290_priv {
        struct tuner_i2c_props i2c_props;

        unsigned char tda8290_easy_mode;

        unsigned char tda827x_addr;

        unsigned char ver;
#define TDA8290   1
#define TDA8295   2
#define TDA8275   4
#define TDA8275A  8
#define TDA18271 16

        struct tda827x_config cfg;
        struct tda18271_std_map *tda18271_std_map;
};

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

static int tda8290_i2c_bridge(struct dvb_frontend *fe, int close)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        static unsigned char  enable[2] = { 0x21, 0xC0 };
        static unsigned char disable[2] = { 0x21, 0x00 };
        unsigned char *msg;

        if (close) {
                msg = enable;
                tuner_i2c_xfer_send(&priv->i2c_props, msg, 2);
                /* let the bridge stabilize */
                msleep(20);
        } else {
                msg = disable;
                tuner_i2c_xfer_send(&priv->i2c_props, msg, 2);
        }

        return 0;
}

static int tda8295_i2c_bridge(struct dvb_frontend *fe, int close)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        static unsigned char  enable[2] = { 0x45, 0xc1 };
        static unsigned char disable[2] = { 0x46, 0x00 };
        static unsigned char buf[3] = { 0x45, 0x01, 0x00 };
        unsigned char *msg;

        if (close) {
                msg = enable;
                tuner_i2c_xfer_send(&priv->i2c_props, msg, 2);
                /* let the bridge stabilize */
                msleep(20);
        } else {
                msg = disable;
                tuner_i2c_xfer_send_recv(&priv->i2c_props, msg, 1, &msg[1], 1);

                buf[2] = msg[1];
                buf[2] &= ~0x04;
                tuner_i2c_xfer_send(&priv->i2c_props, buf, 3);
                msleep(5);

                msg[1] |= 0x04;
                tuner_i2c_xfer_send(&priv->i2c_props, msg, 2);
        }

        return 0;
}

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

static void set_audio(struct dvb_frontend *fe,
                      struct analog_parameters *params)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        char* mode;

        if (params->std & V4L2_STD_MN) {
                priv->tda8290_easy_mode = 0x01;
                mode = "MN";
        } else if (params->std & V4L2_STD_B) {
                priv->tda8290_easy_mode = 0x02;
                mode = "B";
        } else if (params->std & V4L2_STD_GH) {
                priv->tda8290_easy_mode = 0x04;
                mode = "GH";
        } else if (params->std & V4L2_STD_PAL_I) {
                priv->tda8290_easy_mode = 0x08;
                mode = "I";
        } else if (params->std & V4L2_STD_DK) {
                priv->tda8290_easy_mode = 0x10;
                mode = "DK";
        } else if (params->std & V4L2_STD_SECAM_L) {
                priv->tda8290_easy_mode = 0x20;
                mode = "L";
        } else if (params->std & V4L2_STD_SECAM_LC) {
                priv->tda8290_easy_mode = 0x40;
                mode = "LC";
        } else {
                priv->tda8290_easy_mode = 0x10;
                mode = "xx";
        }

        if (params->mode == V4L2_TUNER_RADIO) {
                /* Set TDA8295 to FM radio; Start TDA8290 with MN values */
                priv->tda8290_easy_mode = (priv->ver & TDA8295) ? 0x80 : 0x01;
                tuner_dbg("setting to radio FM\n");
        } else {
                tuner_dbg("setting tda829x to system %s\n", mode);
        }
}

static struct {
        unsigned char seq[2];
} fm_mode[] = {
        { { 0x01, 0x81} },      /* Put device into expert mode */
        { { 0x03, 0x48} },      /* Disable NOTCH and VIDEO filters */
        { { 0x04, 0x04} },      /* Disable color carrier filter (SSIF) */
        { { 0x05, 0x04} },      /* ADC headroom */
        { { 0x06, 0x10} },      /* group delay flat */

        { { 0x07, 0x00} },      /* use the same radio DTO values as a tda8295 */
        { { 0x08, 0x00} },
        { { 0x09, 0x80} },
        { { 0x0a, 0xda} },
        { { 0x0b, 0x4b} },
        { { 0x0c, 0x68} },

        { { 0x0d, 0x00} },      /* PLL off, no video carrier detect */
        { { 0x14, 0x00} },      /* disable auto mute if no video */
};

static void tda8290_set_params(struct dvb_frontend *fe,
                               struct analog_parameters *params)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        static unsigned char soft_reset[]  = { 0x00, 0x00 };
        unsigned char easy_mode[]   = { 0x01, priv->tda8290_easy_mode };
        static unsigned char expert_mode[] = { 0x01, 0x80 };
        static unsigned char agc_out_on[]  = { 0x02, 0x00 };
        static unsigned char gainset_off[] = { 0x28, 0x14 };
        static unsigned char if_agc_spd[]  = { 0x0f, 0x88 };
        static unsigned char adc_head_6[]  = { 0x05, 0x04 };
        static unsigned char adc_head_9[]  = { 0x05, 0x02 };
        static unsigned char adc_head_12[] = { 0x05, 0x01 };
        static unsigned char pll_bw_nom[]  = { 0x0d, 0x47 };
        static unsigned char pll_bw_low[]  = { 0x0d, 0x27 };
        static unsigned char gainset_2[]   = { 0x28, 0x64 };
        static unsigned char agc_rst_on[]  = { 0x0e, 0x0b };
        static unsigned char agc_rst_off[] = { 0x0e, 0x09 };
        static unsigned char if_agc_set[]  = { 0x0f, 0x81 };
        static unsigned char addr_adc_sat  = 0x1a;
        static unsigned char addr_agc_stat = 0x1d;
        static unsigned char addr_pll_stat = 0x1b;
        static unsigned char adc_sat = 0, agc_stat = 0,
                      pll_stat;
        int i;

        set_audio(fe, params);

        if (priv->cfg.config)
                tuner_dbg("tda827xa config is 0x%02x\n", priv->cfg.config);
        tuner_i2c_xfer_send(&priv->i2c_props, easy_mode, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, agc_out_on, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, soft_reset, 2);
        msleep(1);

        if (params->mode == V4L2_TUNER_RADIO) {
                unsigned char deemphasis[]  = { 0x13, 1 };

                /* FIXME: allow using a different deemphasis */

                if (deemphasis_50)
                        deemphasis[1] = 2;

                for (i = 0; i < ARRAY_SIZE(fm_mode); i++)
                        tuner_i2c_xfer_send(&priv->i2c_props, fm_mode[i].seq, 2);

                tuner_i2c_xfer_send(&priv->i2c_props, deemphasis, 2);
        } else {
                expert_mode[1] = priv->tda8290_easy_mode + 0x80;
                tuner_i2c_xfer_send(&priv->i2c_props, expert_mode, 2);
                tuner_i2c_xfer_send(&priv->i2c_props, gainset_off, 2);
                tuner_i2c_xfer_send(&priv->i2c_props, if_agc_spd, 2);
                if (priv->tda8290_easy_mode & 0x60)
                        tuner_i2c_xfer_send(&priv->i2c_props, adc_head_9, 2);
                else
                        tuner_i2c_xfer_send(&priv->i2c_props, adc_head_6, 2);
                tuner_i2c_xfer_send(&priv->i2c_props, pll_bw_nom, 2);
        }


        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 1);

        if (fe->ops.tuner_ops.set_analog_params)
                fe->ops.tuner_ops.set_analog_params(fe, params);

        for (i = 0; i < 3; i++) {
                tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                         &addr_pll_stat, 1, &pll_stat, 1);
                if (pll_stat & 0x80) {
                        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                                 &addr_adc_sat, 1,
                                                 &adc_sat, 1);
                        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                                 &addr_agc_stat, 1,
                                                 &agc_stat, 1);
                        tuner_dbg("tda8290 is locked, AGC: %d\n", agc_stat);
                        break;
                } else {
                        tuner_dbg("tda8290 not locked, no signal?\n");
                        msleep(100);
                }
        }
        /* adjust headroom resp. gain */
        if ((agc_stat > 115) || (!(pll_stat & 0x80) && (adc_sat < 20))) {
                tuner_dbg("adjust gain, step 1. Agc: %d, ADC stat: %d, lock: %d\n",
                           agc_stat, adc_sat, pll_stat & 0x80);
                tuner_i2c_xfer_send(&priv->i2c_props, gainset_2, 2);
                msleep(100);
                tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                         &addr_agc_stat, 1, &agc_stat, 1);
                tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                         &addr_pll_stat, 1, &pll_stat, 1);
                if ((agc_stat > 115) || !(pll_stat & 0x80)) {
                        tuner_dbg("adjust gain, step 2. Agc: %d, lock: %d\n",
                                   agc_stat, pll_stat & 0x80);
                        if (priv->cfg.agcf)
                                priv->cfg.agcf(fe);
                        msleep(100);
                        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                                 &addr_agc_stat, 1,
                                                 &agc_stat, 1);
                        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                                 &addr_pll_stat, 1,
                                                 &pll_stat, 1);
                        if((agc_stat > 115) || !(pll_stat & 0x80)) {
                                tuner_dbg("adjust gain, step 3. Agc: %d\n", agc_stat);
                                tuner_i2c_xfer_send(&priv->i2c_props, adc_head_12, 2);
                                tuner_i2c_xfer_send(&priv->i2c_props, pll_bw_low, 2);
                                msleep(100);
                        }
                }
        }

        /* l/ l' deadlock? */
        if(priv->tda8290_easy_mode & 0x60) {
                tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                         &addr_adc_sat, 1,
                                         &adc_sat, 1);
                tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                         &addr_pll_stat, 1,
                                         &pll_stat, 1);
                if ((adc_sat > 20) || !(pll_stat & 0x80)) {
                        tuner_dbg("trying to resolve SECAM L deadlock\n");
                        tuner_i2c_xfer_send(&priv->i2c_props, agc_rst_on, 2);
                        msleep(40);
                        tuner_i2c_xfer_send(&priv->i2c_props, agc_rst_off, 2);
                }
        }

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 0);
        tuner_i2c_xfer_send(&priv->i2c_props, if_agc_set, 2);
}

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

static void tda8295_power(struct dvb_frontend *fe, int enable)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        unsigned char buf[] = { 0x30, 0x00 }; /* clb_stdbt */

        tuner_i2c_xfer_send_recv(&priv->i2c_props, &buf[0], 1, &buf[1], 1);

        if (enable)
                buf[1] = 0x01;
        else
                buf[1] = 0x03;

        tuner_i2c_xfer_send(&priv->i2c_props, buf, 2);
}

static void tda8295_set_easy_mode(struct dvb_frontend *fe, int enable)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        unsigned char buf[] = { 0x01, 0x00 };

        tuner_i2c_xfer_send_recv(&priv->i2c_props, &buf[0], 1, &buf[1], 1);

        if (enable)
                buf[1] = 0x01; /* rising edge sets regs 0x02 - 0x23 */
        else
                buf[1] = 0x00; /* reset active bit */

        tuner_i2c_xfer_send(&priv->i2c_props, buf, 2);
}

static void tda8295_set_video_std(struct dvb_frontend *fe)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        unsigned char buf[] = { 0x00, priv->tda8290_easy_mode };

        tuner_i2c_xfer_send(&priv->i2c_props, buf, 2);

        tda8295_set_easy_mode(fe, 1);
        msleep(20);
        tda8295_set_easy_mode(fe, 0);
}

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

static void tda8295_agc1_out(struct dvb_frontend *fe, int enable)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        unsigned char buf[] = { 0x02, 0x00 }; /* DIV_FUNC */

        tuner_i2c_xfer_send_recv(&priv->i2c_props, &buf[0], 1, &buf[1], 1);

        if (enable)
                buf[1] &= ~0x40;
        else
                buf[1] |= 0x40;

        tuner_i2c_xfer_send(&priv->i2c_props, buf, 2);
}

static void tda8295_agc2_out(struct dvb_frontend *fe, int enable)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        unsigned char set_gpio_cf[]    = { 0x44, 0x00 };
        unsigned char set_gpio_val[]   = { 0x46, 0x00 };

        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                 &set_gpio_cf[0], 1, &set_gpio_cf[1], 1);
        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                 &set_gpio_val[0], 1, &set_gpio_val[1], 1);

        set_gpio_cf[1] &= 0xf0; /* clear GPIO_0 bits 3-0 */

        if (enable) {
                set_gpio_cf[1]  |= 0x01; /* config GPIO_0 as Open Drain Out */
                set_gpio_val[1] &= 0xfe; /* set GPIO_0 pin low */
        }
        tuner_i2c_xfer_send(&priv->i2c_props, set_gpio_cf, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_gpio_val, 2);
}

static int tda8295_has_signal(struct dvb_frontend *fe, u16 *signal)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        unsigned char hvpll_stat = 0x26;
        unsigned char ret;

        tuner_i2c_xfer_send_recv(&priv->i2c_props, &hvpll_stat, 1, &ret, 1);
        *signal = (ret & 0x01) ? 65535 : 0;
        return 0;
}

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

static void tda8295_set_params(struct dvb_frontend *fe,
                               struct analog_parameters *params)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        u16 signal = 0;
        unsigned char blanking_mode[]     = { 0x1d, 0x00 };

        set_audio(fe, params);

        tuner_dbg("%s: freq = %d\n", __func__, params->frequency);

        tda8295_power(fe, 1);
        tda8295_agc1_out(fe, 1);

        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                 &blanking_mode[0], 1, &blanking_mode[1], 1);

        tda8295_set_video_std(fe);

        blanking_mode[1] = 0x03;
        tuner_i2c_xfer_send(&priv->i2c_props, blanking_mode, 2);
        msleep(20);

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 1);

        if (fe->ops.tuner_ops.set_analog_params)
                fe->ops.tuner_ops.set_analog_params(fe, params);

        if (priv->cfg.agcf)
                priv->cfg.agcf(fe);

        tda8295_has_signal(fe, &signal);
        if (signal)
                tuner_dbg("tda8295 is locked\n");
        else
                tuner_dbg("tda8295 not locked, no signal?\n");

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 0);
}

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

static int tda8290_has_signal(struct dvb_frontend *fe, u16 *signal)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        unsigned char i2c_get_afc[1] = { 0x1B };
        unsigned char afc = 0;

        tuner_i2c_xfer_send_recv(&priv->i2c_props,
                                 i2c_get_afc, ARRAY_SIZE(i2c_get_afc), &afc, 1);
        *signal = (afc & 0x80) ? 65535 : 0;
        return 0;
}

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

static void tda8290_standby(struct dvb_frontend *fe)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        static unsigned char cb1[] = { 0x30, 0xD0 };
        static unsigned char tda8290_standby[] = { 0x00, 0x02 };
        static unsigned char tda8290_agc_tri[] = { 0x02, 0x20 };
        struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0, .buf=cb1, .len = 2};

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 1);
        if (priv->ver & TDA8275A)
                cb1[1] = 0x90;
        i2c_transfer(priv->i2c_props.adap, &msg, 1);
        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 0);
        tuner_i2c_xfer_send(&priv->i2c_props, tda8290_agc_tri, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, tda8290_standby, 2);
}

static void tda8295_standby(struct dvb_frontend *fe)
{
        tda8295_agc1_out(fe, 0); /* Put AGC in tri-state */

        tda8295_power(fe, 0);
}

static void tda8290_init_if(struct dvb_frontend *fe)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        static unsigned char set_VS[] = { 0x30, 0x6F };
        static unsigned char set_GP00_CF[] = { 0x20, 0x01 };
        static unsigned char set_GP01_CF[] = { 0x20, 0x0B };

        if ((priv->cfg.config == TDA8290_LNA_GP0_HIGH_ON) ||
            (priv->cfg.config == TDA8290_LNA_GP0_HIGH_OFF))
                tuner_i2c_xfer_send(&priv->i2c_props, set_GP00_CF, 2);
        else
                tuner_i2c_xfer_send(&priv->i2c_props, set_GP01_CF, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_VS, 2);
}

static void tda8295_init_if(struct dvb_frontend *fe)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        static unsigned char set_adc_ctl[]       = { 0x33, 0x14 };
        static unsigned char set_adc_ctl2[]      = { 0x34, 0x00 };
        static unsigned char set_pll_reg6[]      = { 0x3e, 0x63 };
        static unsigned char set_pll_reg0[]      = { 0x38, 0x23 };
        static unsigned char set_pll_reg7[]      = { 0x3f, 0x01 };
        static unsigned char set_pll_reg10[]     = { 0x42, 0x61 };
        static unsigned char set_gpio_reg0[]     = { 0x44, 0x0b };

        tda8295_power(fe, 1);

        tda8295_set_easy_mode(fe, 0);
        tda8295_set_video_std(fe);

        tuner_i2c_xfer_send(&priv->i2c_props, set_adc_ctl, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_adc_ctl2, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_pll_reg6, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_pll_reg0, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_pll_reg7, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_pll_reg10, 2);
        tuner_i2c_xfer_send(&priv->i2c_props, set_gpio_reg0, 2);

        tda8295_agc1_out(fe, 0);
        tda8295_agc2_out(fe, 0);
}

static void tda8290_init_tuner(struct dvb_frontend *fe)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        static unsigned char tda8275_init[]  =
                { 0x00, 0x00, 0x00, 0x40, 0xdC, 0x04, 0xAf,
                  0x3F, 0x2A, 0x04, 0xFF, 0x00, 0x00, 0x40 };
        static unsigned char tda8275a_init[] =
                 { 0x00, 0x00, 0x00, 0x00, 0xdC, 0x05, 0x8b,
                   0x0c, 0x04, 0x20, 0xFF, 0x00, 0x00, 0x4b };
        struct i2c_msg msg = {.addr = priv->tda827x_addr, .flags=0,
                              .buf=tda8275_init, .len = 14};
        if (priv->ver & TDA8275A)
                msg.buf = tda8275a_init;

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 1);
        i2c_transfer(priv->i2c_props.adap, &msg, 1);
        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 0);
}

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

static void tda829x_release(struct dvb_frontend *fe)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;

        /* only try to release the tuner if we've
         * attached it from within this module */
        if (priv->ver & (TDA18271 | TDA8275 | TDA8275A))
                if (fe->ops.tuner_ops.release)
                        fe->ops.tuner_ops.release(fe);

        kfree(fe->analog_demod_priv);
        fe->analog_demod_priv = NULL;
}

static struct tda18271_config tda829x_tda18271_config = {
        .gate    = TDA18271_GATE_ANALOG,
};

static int tda829x_find_tuner(struct dvb_frontend *fe)
{
        struct tda8290_priv *priv = fe->analog_demod_priv;
        int i, ret, tuners_found;
        u32 tuner_addrs;
        u8 data;
        struct i2c_msg msg = { .flags = I2C_M_RD, .buf = &data, .len = 1 };

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 1);

        /* probe for tuner chip */
        tuners_found = 0;
        tuner_addrs = 0;
        for (i = 0x60; i <= 0x63; i++) {
                msg.addr = i;
                ret = i2c_transfer(priv->i2c_props.adap, &msg, 1);
                if (ret == 1) {
                        tuners_found++;
                        tuner_addrs = (tuner_addrs << 8) + i;
                }
        }
        /* if there is more than one tuner, we expect the right one is
           behind the bridge and we choose the highest address that doesn't
           give a response now
         */

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 0);

        if (tuners_found > 1)
                for (i = 0; i < tuners_found; i++) {
                        msg.addr = tuner_addrs  & 0xff;
                        ret = i2c_transfer(priv->i2c_props.adap, &msg, 1);
                        if (ret == 1)
                                tuner_addrs = tuner_addrs >> 8;
                        else
                                break;
                }

        if (tuner_addrs == 0) {
                tuner_addrs = 0x60;
                tuner_info("could not clearly identify tuner address, defaulting to %x\n",
                           tuner_addrs);
        } else {
                tuner_addrs = tuner_addrs & 0xff;
                tuner_info("setting tuner address to %x\n", tuner_addrs);
        }
        priv->tda827x_addr = tuner_addrs;
        msg.addr = tuner_addrs;

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 1);
        ret = i2c_transfer(priv->i2c_props.adap, &msg, 1);

        if (ret != 1) {
                tuner_warn("tuner access failed!\n");
                if (fe->ops.analog_ops.i2c_gate_ctrl)
                        fe->ops.analog_ops.i2c_gate_ctrl(fe, 0);
                return -EREMOTEIO;
        }

        if ((data == 0x83) || (data == 0x84)) {
                priv->ver |= TDA18271;
                tda829x_tda18271_config.config = priv->cfg.config;
                tda829x_tda18271_config.std_map = priv->tda18271_std_map;
                dvb_attach(tda18271_attach, fe, priv->tda827x_addr,
                           priv->i2c_props.adap, &tda829x_tda18271_config);
        } else {
                if ((data & 0x3c) == 0)
                        priv->ver |= TDA8275;
                else
                        priv->ver |= TDA8275A;

                dvb_attach(tda827x_attach, fe, priv->tda827x_addr,
                           priv->i2c_props.adap, &priv->cfg);
                priv->cfg.switch_addr = priv->i2c_props.addr;
        }
        if (fe->ops.tuner_ops.init)
                fe->ops.tuner_ops.init(fe);

        if (fe->ops.tuner_ops.sleep)
                fe->ops.tuner_ops.sleep(fe);

        if (fe->ops.analog_ops.i2c_gate_ctrl)
                fe->ops.analog_ops.i2c_gate_ctrl(fe, 0);

        return 0;
}

static int tda8290_probe(struct tuner_i2c_props *i2c_props)
{
#define TDA8290_ID 0x89
        u8 reg = 0x1f, id;
        struct i2c_msg msg_read[] = {
                { .addr = i2c_props->addr, .flags = 0, .len = 1, .buf = &reg },
                { .addr = i2c_props->addr, .flags = I2C_M_RD, .len = 1, .buf = &id },
        };

        /* detect tda8290 */
        if (i2c_transfer(i2c_props->adap, msg_read, 2) != 2) {
                printk(KERN_WARNING "%s: couldn't read register 0x%02x\n",
                               __func__, reg);
                return -ENODEV;
        }

        if (id == TDA8290_ID) {
                if (debug)
                        printk(KERN_DEBUG "%s: tda8290 detected @ %d-%04x\n",
                               __func__, i2c_adapter_id(i2c_props->adap),
                               i2c_props->addr);
                return 0;
        }
        return -ENODEV;
}

static int tda8295_probe(struct tuner_i2c_props *i2c_props)
{
#define TDA8295_ID 0x8a
#define TDA8295C2_ID 0x8b
        u8 reg = 0x2f, id;
        struct i2c_msg msg_read[] = {
                { .addr = i2c_props->addr, .flags = 0, .len = 1, .buf = &reg },
                { .addr = i2c_props->addr, .flags = I2C_M_RD, .len = 1, .buf = &id },
        };

        /* detect tda8295 */
        if (i2c_transfer(i2c_props->adap, msg_read, 2) != 2) {
                printk(KERN_WARNING "%s: couldn't read register 0x%02x\n",
                               __func__, reg);
                return -ENODEV;
        }

        if ((id & 0xfe) == TDA8295_ID) {
                if (debug)
                        printk(KERN_DEBUG "%s: %s detected @ %d-%04x\n",
                               __func__, (id == TDA8295_ID) ?
                               "tda8295c1" : "tda8295c2",
                               i2c_adapter_id(i2c_props->adap),
                               i2c_props->addr);
                return 0;
        }

        return -ENODEV;
}

static const struct analog_demod_ops tda8290_ops = {
        .set_params     = tda8290_set_params,
        .has_signal     = tda8290_has_signal,
        .standby        = tda8290_standby,
        .release        = tda829x_release,
        .i2c_gate_ctrl  = tda8290_i2c_bridge,
};

static const struct analog_demod_ops tda8295_ops = {
        .set_params     = tda8295_set_params,
        .has_signal     = tda8295_has_signal,
        .standby        = tda8295_standby,
        .release        = tda829x_release,
        .i2c_gate_ctrl  = tda8295_i2c_bridge,
};

struct dvb_frontend *tda829x_attach(struct dvb_frontend *fe,
                                    struct i2c_adapter *i2c_adap, u8 i2c_addr,
                                    struct tda829x_config *cfg)
{
        struct tda8290_priv *priv = NULL;
        char *name;

        priv = kzalloc_obj(struct tda8290_priv);
        if (priv == NULL)
                return NULL;
        fe->analog_demod_priv = priv;

        priv->i2c_props.addr     = i2c_addr;
        priv->i2c_props.adap     = i2c_adap;
        priv->i2c_props.name     = "tda829x";
        if (cfg) {
                priv->cfg.config = cfg->lna_cfg;
                priv->tda18271_std_map = cfg->tda18271_std_map;
        }

        if (tda8290_probe(&priv->i2c_props) == 0) {
                priv->ver = TDA8290;
                memcpy(&fe->ops.analog_ops, &tda8290_ops,
                       sizeof(struct analog_demod_ops));
        }

        if (tda8295_probe(&priv->i2c_props) == 0) {
                priv->ver = TDA8295;
                memcpy(&fe->ops.analog_ops, &tda8295_ops,
                       sizeof(struct analog_demod_ops));
        }

        if (cfg && cfg->no_i2c_gate)
                fe->ops.analog_ops.i2c_gate_ctrl = NULL;

        if (!(cfg) || (TDA829X_PROBE_TUNER == cfg->probe_tuner)) {
                tda8295_power(fe, 1);
                if (tda829x_find_tuner(fe) < 0)
                        goto fail;
        }

        switch (priv->ver) {
        case TDA8290:
                name = "tda8290";
                break;
        case TDA8295:
                name = "tda8295";
                break;
        case TDA8290 | TDA8275:
                name = "tda8290+75";
                break;
        case TDA8295 | TDA8275:
                name = "tda8295+75";
                break;
        case TDA8290 | TDA8275A:
                name = "tda8290+75a";
                break;
        case TDA8295 | TDA8275A:
                name = "tda8295+75a";
                break;
        case TDA8290 | TDA18271:
                name = "tda8290+18271";
                break;
        case TDA8295 | TDA18271:
                name = "tda8295+18271";
                break;
        default:
                goto fail;
        }
        tuner_info("type set to %s\n", name);

        fe->ops.analog_ops.info.name = name;

        if (priv->ver & TDA8290) {
                if (priv->ver & (TDA8275 | TDA8275A))
                        tda8290_init_tuner(fe);
                tda8290_init_if(fe);
        } else if (priv->ver & TDA8295)
                tda8295_init_if(fe);

        return fe;

fail:
        memset(&fe->ops.analog_ops, 0, sizeof(struct analog_demod_ops));

        tda829x_release(fe);
        return NULL;
}
EXPORT_SYMBOL_GPL(tda829x_attach);

int tda829x_probe(struct i2c_adapter *i2c_adap, u8 i2c_addr)
{
        struct tuner_i2c_props i2c_props = {
                .adap = i2c_adap,
                .addr = i2c_addr,
        };

        static unsigned char soft_reset[]   = { 0x00, 0x00 };
        static unsigned char easy_mode_b[]  = { 0x01, 0x02 };
        static unsigned char easy_mode_g[]  = { 0x01, 0x04 };
        static unsigned char restore_9886[] = { 0x00, 0xd6, 0x30 };
        static unsigned char addr_dto_lsb = 0x07;
        unsigned char data;
#define PROBE_BUFFER_SIZE 8
        unsigned char buf[PROBE_BUFFER_SIZE];
        int i;

        /* rule out tda9887, which would return the same byte repeatedly */
        tuner_i2c_xfer_send_recv(&i2c_props,
                                 soft_reset, 1, buf, PROBE_BUFFER_SIZE);
        for (i = 1; i < PROBE_BUFFER_SIZE; i++) {
                if (buf[i] != buf[0])
                        break;
        }

        /* all bytes are equal, not a tda829x - probably a tda9887 */
        if (i == PROBE_BUFFER_SIZE)
                return -ENODEV;

        if ((tda8290_probe(&i2c_props) == 0) ||
            (tda8295_probe(&i2c_props) == 0))
                return 0;

        /* fall back to old probing method */
        tuner_i2c_xfer_send(&i2c_props, easy_mode_b, 2);
        tuner_i2c_xfer_send(&i2c_props, soft_reset, 2);
        tuner_i2c_xfer_send_recv(&i2c_props, &addr_dto_lsb, 1, &data, 1);
        if (data == 0) {
                tuner_i2c_xfer_send(&i2c_props, easy_mode_g, 2);
                tuner_i2c_xfer_send(&i2c_props, soft_reset, 2);
                tuner_i2c_xfer_send_recv(&i2c_props,
                                         &addr_dto_lsb, 1, &data, 1);
                if (data == 0x7b) {
                        return 0;
                }
        }
        tuner_i2c_xfer_send(&i2c_props, restore_9886, 3);
        return -ENODEV;
}
EXPORT_SYMBOL_GPL(tda829x_probe);

MODULE_DESCRIPTION("Philips/NXP TDA8290/TDA8295 analog IF demodulator driver");
MODULE_AUTHOR("Gerd Knorr, Hartmut Hackmann, Michael Krufky");
MODULE_LICENSE("GPL");