cx88-i2c.c

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/*

    cx88-i2c.c  --  all the i2c code is here

    Copyright (C) 1996,97,98 Ralph  Metzler ([email protected])
               & Marcus Metzler ([email protected])
    (c) 2002 Yurij Sysoev <[email protected]>
    (c) 1999-2003 Gerd Knorr <[email protected]>

    (c) 2005 Mauro Carvalho Chehab <[email protected]>
    - Multituner support and i2c address binding

    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/module.h>
#include <linux/init.h>

#include <asm/io.h>

#include "cx88.h"
#include <media/v4l2-common.h>

static unsigned int i2c_debug;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");

static unsigned int i2c_scan;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");

static unsigned int i2c_udelay = 5;
module_param(i2c_udelay, int, 0644);
MODULE_PARM_DESC(i2c_udelay,"i2c delay at insmod time, in usecs "
        "(should be 5 or higher). Lower value means higher bus speed.");

#define dprintk(level,fmt, arg...)  if (i2c_debug >= level) \
    printk(KERN_DEBUG "%s: " fmt, core->name , ## arg)

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

static void cx8800_bit_setscl(void *data, int state)
{
    struct cx88_core *core = data;

    if (state)
        core->i2c_state |= 0x02;
    else
        core->i2c_state &= ~0x02;
    cx_write(MO_I2C, core->i2c_state);
    cx_read(MO_I2C);
}

static void cx8800_bit_setsda(void *data, int state)
{
    struct cx88_core *core = data;

    if (state)
        core->i2c_state |= 0x01;
    else
        core->i2c_state &= ~0x01;
    cx_write(MO_I2C, core->i2c_state);
    cx_read(MO_I2C);
}

static int cx8800_bit_getscl(void *data)
{
    struct cx88_core *core = data;
    u32 state;

    state = cx_read(MO_I2C);
    return state & 0x02 ? 1 : 0;
}

static int cx8800_bit_getsda(void *data)
{
    struct cx88_core *core = data;
    u32 state;

    state = cx_read(MO_I2C);
    return state & 0x01;
}

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

static const struct i2c_algo_bit_data cx8800_i2c_algo_template = {
    .setsda  = cx8800_bit_setsda,
    .setscl  = cx8800_bit_setscl,
    .getsda  = cx8800_bit_getsda,
    .getscl  = cx8800_bit_getscl,
    .udelay  = 16,
    .timeout = 200,
};

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

static const char * const i2c_devs[128] = {
    [ 0x1c >> 1 ] = "lgdt330x",
    [ 0x86 >> 1 ] = "tda9887/cx22702",
    [ 0xa0 >> 1 ] = "eeprom",
    [ 0xc0 >> 1 ] = "tuner (analog)",
    [ 0xc2 >> 1 ] = "tuner (analog/dvb)",
    [ 0xc8 >> 1 ] = "xc5000",
};

static void do_i2c_scan(const char *name, struct i2c_client *c)
{
    unsigned char buf;
    int i,rc;

    for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
        c->addr = i;
        rc = i2c_master_recv(c,&buf,0);
        if (rc < 0)
            continue;
        printk("%s: i2c scan: found device @ 0x%x  [%s]\n",
               name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
    }
}

/* init + register i2c adapter */
int cx88_i2c_init(struct cx88_core *core, struct pci_dev *pci)
{
    /* Prevents usage of invalid delay values */
    if (i2c_udelay<5)
        i2c_udelay=5;

    memcpy(&core->i2c_algo, &cx8800_i2c_algo_template,
           sizeof(core->i2c_algo));


    core->i2c_adap.dev.parent = &pci->dev;
    strlcpy(core->i2c_adap.name,core->name,sizeof(core->i2c_adap.name));
    core->i2c_adap.owner = THIS_MODULE;
    core->i2c_algo.udelay = i2c_udelay;
    core->i2c_algo.data = core;
    i2c_set_adapdata(&core->i2c_adap, &core->v4l2_dev);
    core->i2c_adap.algo_data = &core->i2c_algo;
    core->i2c_client.adapter = &core->i2c_adap;
    strlcpy(core->i2c_client.name, "cx88xx internal", I2C_NAME_SIZE);

    cx8800_bit_setscl(core,1);
    cx8800_bit_setsda(core,1);

    core->i2c_rc = i2c_bit_add_bus(&core->i2c_adap);
    if (0 == core->i2c_rc) {
        static u8 tuner_data[] =
            { 0x0b, 0xdc, 0x86, 0x52 };
        static struct i2c_msg tuner_msg =
            { .flags = 0, .addr = 0xc2 >> 1, .buf = tuner_data, .len = 4 };

        dprintk(1, "i2c register ok\n");
        switch( core->boardnr ) {
            case CX88_BOARD_HAUPPAUGE_HVR1300:
            case CX88_BOARD_HAUPPAUGE_HVR3000:
            case CX88_BOARD_HAUPPAUGE_HVR4000:
                printk("%s: i2c init: enabling analog demod on HVR1300/3000/4000 tuner\n",
                    core->name);
                i2c_transfer(core->i2c_client.adapter, &tuner_msg, 1);
                break;
            default:
                break;
        }
        if (i2c_scan)
            do_i2c_scan(core->name,&core->i2c_client);
    } else
        printk("%s: i2c register FAILED\n", core->name);

    return core->i2c_rc;
}