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/*
    bttv-if.c  --  interfaces to other kernel modules
        all the i2c code is here
        also the gpio interface exported by bttv (used by lirc)

    bttv - Bt848 frame grabber driver

    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
                           & Marcus Metzler (mocm@thp.uni-koeln.de)
    (c) 1999,2000 Gerd Knorr <kraxel@goldbach.in-berlin.de>

    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.
   
*/

/* SHARK version by Giacomo Guidi <giacomo@gandalf.sssup.it> */

#define __NO_VERSION__ 1

#include <linux/pci.h>
#include <string.h>
#include <asm/io.h>

#include "drivers/bttv.h"
#include "drivers/tuner.h"

#define printk cprintf

static struct i2c_algo_bit_data bttv_i2c_algo_template;
static struct i2c_adapter bttv_i2c_adap_template;
static struct i2c_client bttv_i2c_client_template;

/* ----------------------------------------------------------------------- */
/* Exported functions - for other modules which want to access the         */
/*                      gpio ports (IR for example)                        */
/*                      see bttv.h for comments                            */

int bttv_get_cardinfo(unsigned int card, int *type, int *cardid)
{
        if (card >= bttv_num) {
                return -1;
        }
        *type   = bttvs[card].type;
        *cardid = bttvs[card].cardid;
        return 0;
}

int bttv_gpio_enable(unsigned int card, unsigned long mask, unsigned long data)
{
        struct bttv *btv;

        if (card >= bttv_num) {
                return -EINVAL;
        }
       
        btv = &bttvs[card];
        btaor(data, ~mask, BT848_GPIO_OUT_EN);
        if (bttv_gpio)
                bttv_gpio_tracking(btv,"extern enable");
        return 0;
}

int bttv_read_gpio(unsigned int card, unsigned long *data)
{
        struct bttv *btv;
       
        if (card >= bttv_num) {
                return -EINVAL;
        }

        btv = &bttvs[card];

        if(btv->shutdown) {
                return -ENODEV;
        }

/* prior setting BT848_GPIO_REG_INP is (probably) not needed
   because we set direct input on init */
        *data = gpioread();
        return 0;
}

int bttv_write_gpio(unsigned int card, unsigned long mask, unsigned long data)
{
        struct bttv *btv;
       
        if (card >= bttv_num) {
                return -EINVAL;
        }

        btv = &bttvs[card];

/* prior setting BT848_GPIO_REG_INP is (probably) not needed
   because direct input is set on init */
        gpioaor(data & mask, ~mask);
        if (bttv_gpio)
                bttv_gpio_tracking(btv,"extern write");
        return 0;
}

/* ----------------------------------------------------------------------- */
/* I2C functions                                                           */

void bttv_bit_setscl(void *data, int state)
{
        struct bttv *btv = (struct bttv*)data;
        unsigned long tmp;
       
        if (state)
                btv->i2c_state |= 0x02;
        else
                btv->i2c_state &= ~0x02;
        btwrite(btv->i2c_state, BT848_I2C);
        tmp = btread(BT848_I2C);
}

void bttv_bit_setsda(void *data, int state)
{
        struct bttv *btv = (struct bttv*)data;
        unsigned long tmp;
       
        if (state)
                btv->i2c_state |= 0x01;
        else
                btv->i2c_state &= ~0x01;
        btwrite(btv->i2c_state, BT848_I2C);
        tmp = btread(BT848_I2C);
}

static int bttv_bit_getscl(void *data)
{
        struct bttv *btv = (struct bttv*)data;
        int state;
       
        state = btread(BT848_I2C) & 0x02 ? 1 : 0;
        return state;
}

static int bttv_bit_getsda(void *data)
{
        struct bttv *btv = (struct bttv*)data;
        int state;

        state = btread(BT848_I2C) & 0x01;
        return state;
}

static void bttv_inc_use(struct i2c_adapter *adap)
{
        MOD_INC_USE_COUNT;
}

static void bttv_dec_use(struct i2c_adapter *adap)
{
        MOD_DEC_USE_COUNT;
}

static int attach_inform(struct i2c_client *client)
{
        struct bttv *btv = (struct bttv*)client->adapter->data;
        int i;

        for (i = 0; i < I2C_CLIENTS_MAX; i++) {
                if (btv->i2c_clients[i] == NULL) {
                        btv->i2c_clients[i] = client;
                        break;
                }
        }
        if (btv->tuner_type != -1)
                bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type);
        if (bttv_verbose)
                cprintf("bttv%d: i2c attach [client=%s,%s]\n",btv->nr,
                       client->name, (i < I2C_CLIENTS_MAX) ?  "ok" : "failed");
        return 0;
}

static int detach_inform(struct i2c_client *client)
{
        struct bttv *btv = (struct bttv*)client->adapter->data;
        int i;

        for (i = 0; i < I2C_CLIENTS_MAX; i++) {
                if (btv->i2c_clients[i] == client) {
                        btv->i2c_clients[i] = NULL;
                        break;
                }
        }
        if (bttv_verbose)
                cprintf("bttv%d: i2c detach [client=%s,%s]\n",btv->nr,
                       client->name, (i < I2C_CLIENTS_MAX) ?  "ok" : "failed");
        return 0;
}

void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
{
        int i;
       
        for (i = 0; i < I2C_CLIENTS_MAX; i++) {
                if (NULL == btv->i2c_clients[i])
                        continue;
                if (NULL == btv->i2c_clients[i]->driver->command)
                        continue;
                btv->i2c_clients[i]->driver->command(
                        btv->i2c_clients[i],cmd,arg);
        }
}

static struct i2c_algo_bit_data bttv_i2c_algo_template = {
        setsda:  bttv_bit_setsda,
        setscl:  bttv_bit_setscl,
        getsda:  bttv_bit_getsda,
        getscl:  bttv_bit_getscl,
        udelay:  16,
        mdelay:  10,
        timeout: 200,
};

static struct i2c_adapter bttv_i2c_adap_template = {
        name:              "bt848",
        id:                I2C_HW_B_BT848,
        inc_use:           bttv_inc_use,
        dec_use:           bttv_dec_use,
        client_register:   attach_inform,
        client_unregister: detach_inform,
};

static struct i2c_client bttv_i2c_client_template = {
        name: "bttv internal use only",
        id:   -1,
};


/* read I2C */
int bttv_I2CRead(struct bttv *btv, unsigned char addr, char *probe_for)
{
        unsigned char buffer = 0;

        if (0 != btv->i2c_rc)
                return -1;
        if (bttv_verbose && NULL != probe_for)
                printk("[info  ] bttv%d: i2c: checking for %s @ 0x%02x... ",
                       btv->nr,probe_for,addr);
        btv->i2c_client.addr = addr >> 1;
        if (1 != i2c_master_recv(&btv->i2c_client, &buffer, 1)) {
                if (NULL != probe_for) {
                        if (bttv_verbose)
                                printk("not found\n");
                } else
                        printk("bttv%d: i2c read 0x%x: error\n",
                               btv->nr,addr);
                return -1;
        }
        if (bttv_verbose && NULL != probe_for)
                printk("found\n");
        return buffer;
}

/* write I2C */
int bttv_I2CWrite(struct bttv *btv, unsigned char addr, unsigned char b1,
                    unsigned char b2, int both)
{
        unsigned char buffer[2];
        int bytes = both ? 2 : 1;

        if (0 != btv->i2c_rc)
                return -1;
        btv->i2c_client.addr = addr >> 1;
        buffer[0] = b1;
        buffer[1] = b2;
        if (bytes != i2c_master_send(&btv->i2c_client, buffer, bytes))
                return -1;
        return 0;
}

/* read EEPROM content */
void bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
{
        int i;
       
        if (bttv_I2CWrite(btv, addr, 0, -1, 0)<0) {
                printk("bttv: readee error\n");
                return;
        }
        btv->i2c_client.addr = addr >> 1;
        for (i=0; i<256; i+=16) {
                if (16 != i2c_master_recv(&btv->i2c_client,eedata+i,16)) {
                        printk("bttv: readee error\n");
                        break;
                }
        }
}

/* TODO: get an assigned bus id */
#define I2C_HW_B_BT848_OSPREY 0x0FF
       
/* init + register i2c algo-bit adapter */
int init_bttv_i2c(struct bttv *btv)
{
        memcpy(&btv->i2c_adap, &bttv_i2c_adap_template,
               sizeof(struct i2c_adapter));
       
        if ((btv->type == BTTV_OSPREY2000) ||
            (btv->type == BTTV_OSPREY5x0)) {
            /* these boards have the bt860 which conflicts with the tda7432
             * which will attempt to load when this type of bus is registered.
             * change the bus name to prevent this (and any other conflicts)
             * from occuring */
            btv->i2c_adap.id = I2C_HW_B_BT848_OSPREY;
        }
       
        memcpy(&btv->i2c_algo, &bttv_i2c_algo_template,
               sizeof(struct i2c_algo_bit_data));
        memcpy(&btv->i2c_client, &bttv_i2c_client_template,
               sizeof(struct i2c_client));

        sprintf(btv->i2c_adap.name+strlen(btv->i2c_adap.name),
                " #%d", btv->nr);
        btv->i2c_algo.data = btv;
        btv->i2c_adap.data = btv;
        btv->i2c_adap.algo_data = &btv->i2c_algo;
        btv->i2c_client.adapter = &btv->i2c_adap;

        bttv_bit_setscl(btv,1);
        bttv_bit_setsda(btv,1);

        printk("[info  ] bttv: adding i2c bus to system\n");
        btv->i2c_rc = i2c_bit_add_bus(&btv->i2c_adap);
        printk("[info  ] bttv: i2c bus added to system\n");
        return btv->i2c_rc;
}

/* find a bttv struct by matching some data from the pci bus (for audio) */
struct bttv *bttv_find_matching_card( struct pci_dev *dev )
{
        int i;
       
        if (dev == NULL) return NULL;
        for (i = 0;i < bttv_num;i++) {
                if (bttvs[i].dev == NULL) {
                        continue; //hmm...can this ever happen?
                }
                if ((dev->bus->number == bttvs[i].dev->bus->number) &&
                    (PCI_SLOT(dev->devfn) == PCI_SLOT(bttvs[i].dev->devfn))) {
                        //match! return this one.
                        return &(bttvs[i]);
                }
        }
        return NULL;
}

struct gpio_adapter *bttv_get_gpio( struct bttv *btv )
{
        return &(btv->gpio_adap);
}

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */