stb6000.c

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  /*
     Driver for ST STB6000 DVBS Silicon tuner

     Copyright (C) 2008 Igor M. Liplianin ([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/slab.h>
#include <linux/module.h>
#include <linux/dvb/frontend.h>
#include <asm/types.h>

#include "stb6000.h"

static int debug;
#define dprintk(args...) \
    do { \
        if (debug) \
            printk(KERN_DEBUG "stb6000: " args); \
    } while (0)

struct stb6000_priv {
    /* i2c details */
    int i2c_address;
    struct i2c_adapter *i2c;
    u32 frequency;
};

static int stb6000_release(struct dvb_frontend *fe)
{
    kfree(fe->tuner_priv);
    fe->tuner_priv = NULL;
    return 0;
}

static int stb6000_sleep(struct dvb_frontend *fe)
{
    struct stb6000_priv *priv = fe->tuner_priv;
    int ret;
    u8 buf[] = { 10, 0 };
    struct i2c_msg msg = {
        .addr = priv->i2c_address,
        .flags = 0,
        .buf = buf,
        .len = 2
    };

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

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

    ret = i2c_transfer(priv->i2c, &msg, 1);
    if (ret != 1)
        dprintk("%s: i2c error\n", __func__);

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

    return (ret == 1) ? 0 : ret;
}

static int stb6000_set_params(struct dvb_frontend *fe)
{
    struct dtv_frontend_properties *p = &fe->dtv_property_cache;
    struct stb6000_priv *priv = fe->tuner_priv;
    unsigned int n, m;
    int ret;
    u32 freq_mhz;
    int bandwidth;
    u8 buf[12];
    struct i2c_msg msg = {
        .addr = priv->i2c_address,
        .flags = 0,
        .buf = buf,
        .len = 12
    };

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

    freq_mhz = p->frequency / 1000;
    bandwidth = p->symbol_rate / 1000000;

    if (bandwidth > 31)
        bandwidth = 31;

    if ((freq_mhz > 949) && (freq_mhz < 2151)) {
        buf[0] = 0x01;
        buf[1] = 0xac;
        if (freq_mhz < 1950)
            buf[1] = 0xaa;
        if (freq_mhz < 1800)
            buf[1] = 0xa8;
        if (freq_mhz < 1650)
            buf[1] = 0xa6;
        if (freq_mhz < 1530)
            buf[1] = 0xa5;
        if (freq_mhz < 1470)
            buf[1] = 0xa4;
        if (freq_mhz < 1370)
            buf[1] = 0xa2;
        if (freq_mhz < 1300)
            buf[1] = 0xa1;
        if (freq_mhz < 1200)
            buf[1] = 0xa0;
        if (freq_mhz < 1075)
            buf[1] = 0xbc;
        if (freq_mhz < 1000)
            buf[1] = 0xba;
        if (freq_mhz < 1075) {
            n = freq_mhz / 8; /* vco=lo*4 */
            m = 2;
        } else {
            n = freq_mhz / 16; /* vco=lo*2 */
            m = 1;
        }
        buf[2] = n >> 1;
        buf[3] = (unsigned char)(((n & 1) << 7) |
                    (m * freq_mhz - n * 16) | 0x60);
        buf[4] = 0x04;
        buf[5] = 0x0e;

        buf[6] = (unsigned char)(bandwidth);

        buf[7] = 0xd8;
        buf[8] = 0xd0;
        buf[9] = 0x50;
        buf[10] = 0xeb;
        buf[11] = 0x4f;

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

        ret = i2c_transfer(priv->i2c, &msg, 1);
        if (ret != 1)
            dprintk("%s: i2c error\n", __func__);

        udelay(10);
        if (fe->ops.i2c_gate_ctrl)
            fe->ops.i2c_gate_ctrl(fe, 0);

        buf[0] = 0x07;
        buf[1] = 0xdf;
        buf[2] = 0xd0;
        buf[3] = 0x50;
        buf[4] = 0xfb;
        msg.len = 5;

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

        ret = i2c_transfer(priv->i2c, &msg, 1);
        if (ret != 1)
            dprintk("%s: i2c error\n", __func__);

        udelay(10);
        if (fe->ops.i2c_gate_ctrl)
            fe->ops.i2c_gate_ctrl(fe, 0);

        priv->frequency = freq_mhz * 1000;

        return (ret == 1) ? 0 : ret;
    }
    return -1;
}

static int stb6000_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
    struct stb6000_priv *priv = fe->tuner_priv;
    *frequency = priv->frequency;
    return 0;
}

static struct dvb_tuner_ops stb6000_tuner_ops = {
    .info = {
        .name = "ST STB6000",
        .frequency_min = 950000,
        .frequency_max = 2150000
    },
    .release = stb6000_release,
    .sleep = stb6000_sleep,
    .set_params = stb6000_set_params,
    .get_frequency = stb6000_get_frequency,
};

struct dvb_frontend *stb6000_attach(struct dvb_frontend *fe, int addr,
                        struct i2c_adapter *i2c)
{
    struct stb6000_priv *priv = NULL;
    u8 b0[] = { 0 };
    u8 b1[] = { 0, 0 };
    struct i2c_msg msg[2] = {
        {
            .addr = addr,
            .flags = 0,
            .buf = b0,
            .len = 0
        }, {
            .addr = addr,
            .flags = I2C_M_RD,
            .buf = b1,
            .len = 2
        }
    };
    int ret;

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

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

    /* is some i2c device here ? */
    ret = i2c_transfer(i2c, msg, 2);
    if (fe->ops.i2c_gate_ctrl)
        fe->ops.i2c_gate_ctrl(fe, 0);

    if (ret != 2)
        return NULL;

    priv = kzalloc(sizeof(struct stb6000_priv), GFP_KERNEL);
    if (priv == NULL)
        return NULL;

    priv->i2c_address = addr;
    priv->i2c = i2c;

    memcpy(&fe->ops.tuner_ops, &stb6000_tuner_ops,
                sizeof(struct dvb_tuner_ops));

    fe->tuner_priv = priv;

    return fe;
}
EXPORT_SYMBOL(stb6000_attach);

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

MODULE_DESCRIPTION("DVB STB6000 driver");
MODULE_AUTHOR("Igor M. Liplianin <[email protected]>");
MODULE_LICENSE("GPL");