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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) 1999-2003 Gerd Knorr <kraxel@bytesex.org>

    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 <linuxcomp.h>

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

#include <asm/io.h>

#include "drivers/bttvp.h"

static struct i2c_algo_bit_data bttv_i2c_algo_bit_template;
static struct i2c_adapter bttv_i2c_adap_sw_template;
static struct i2c_adapter bttv_i2c_adap_hw_template;
static struct i2c_client bttv_i2c_client_template;

#ifndef I2C_PEC
static void bttv_inc_use(struct i2c_adapter *adap);
static void bttv_dec_use(struct i2c_adapter *adap);
#endif
static int attach_inform(struct i2c_client *client);

EXPORT_SYMBOL(bttv_get_cardinfo);
EXPORT_SYMBOL(bttv_get_pcidev);
EXPORT_SYMBOL(bttv_get_id);
EXPORT_SYMBOL(bttv_gpio_enable);
EXPORT_SYMBOL(bttv_read_gpio);
EXPORT_SYMBOL(bttv_write_gpio);
EXPORT_SYMBOL(bttv_get_gpio_queue);
EXPORT_SYMBOL(bttv_i2c_call);

static int i2c_debug = 1;
static int i2c_hw = 0;
MODULE_PARM(i2c_debug,"i");
MODULE_PARM(i2c_hw,"i");

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

struct pci_dev* bttv_get_pcidev(unsigned int card)
{
        if (card >= bttv_num)
                return NULL;
        return bttvs[card].dev;
}

int bttv_get_id(unsigned int card)
{
        printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n");
        if (card >= bttv_num) {
                return -1;
        }
        return bttvs[card].type;
}


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 = btread(BT848_GPIO_DATA);
        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 */
        btaor(data & mask, ~mask, BT848_GPIO_DATA);
        if (bttv_gpio)
                bttv_gpio_tracking(btv,"extern write");
        return 0;
}

wait_queue_head_t* bttv_get_gpio_queue(unsigned int card)
{
        struct bttv *btv;

        if (card >= bttv_num) {
                return NULL;
        }

        btv = &bttvs[card];
        if (bttvs[card].shutdown) {
                return NULL;
        }
        return &btv->gpioq;
}


/* ----------------------------------------------------------------------- */
/* I2C functions - bitbanging adapter (software i2c)                       */

void bttv_bit_setscl(void *data, int state)
{
        struct bttv *btv = (struct bttv*)data;

        if (state)
                btv->i2c_state |= 0x02;
        else
                btv->i2c_state &= ~0x02;
        btwrite(btv->i2c_state, BT848_I2C);
        btread(BT848_I2C);
}

void bttv_bit_setsda(void *data, int state)
{
        struct bttv *btv = (struct bttv*)data;

        if (state)
                btv->i2c_state |= 0x01;
        else
                btv->i2c_state &= ~0x01;
        btwrite(btv->i2c_state, BT848_I2C);
        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 struct i2c_algo_bit_data bttv_i2c_algo_bit_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_sw_template = {
#ifdef I2C_PEC
        .owner             = THIS_MODULE,
#else
        .inc_use           = bttv_inc_use,
        .dec_use           = bttv_dec_use,
#endif
#ifdef I2C_ADAP_CLASS_TV_ANALOG
        .class             = I2C_ADAP_CLASS_TV_ANALOG,
#endif
        I2C_DEVNAME("bt848"),
        .id                = I2C_HW_B_BT848,
        .client_register   = attach_inform,
};

/* ----------------------------------------------------------------------- */
/* I2C functions - hardware i2c                                            */

static int algo_control(struct i2c_adapter *adapter,
                        unsigned int cmd, unsigned long arg)
{
        return 0;
}

static u32 functionality(struct i2c_adapter *adap)
{
        return I2C_FUNC_SMBUS_EMUL;
}

extern unsigned long read_time(void);

static int
bttv_i2c_wait_done(struct bttv *btv)
{
        u32 stat;
        unsigned long timeout;

        timeout = read_time() + 10000; /* 10ms */
        for (;;) {
                stat = btread(BT848_INT_STAT);
                if (stat & BT848_INT_I2CDONE)
                        break;
                if (timeout > read_time())
                        return -EIO;
                udelay(10);
        }
        btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
        return ((stat & BT848_INT_RACK) ? 1 : 0);
}

#define I2C_HW (BT878_I2C_MODE  | BT848_I2C_SYNC |\
                BT848_I2C_SCL | BT848_I2C_SDA)

static int
bttv_i2c_sendbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
{
        u32 xmit;
        int retval,cnt;

        /* start, address + first byte */
        xmit = (msg->addr << 25) | (msg->buf[0] << 16) | I2C_HW;
        if (msg->len > 1 || !last)
                xmit |= BT878_I2C_NOSTOP;
        btwrite(xmit, BT848_I2C);
        retval = bttv_i2c_wait_done(btv);
        if (retval < 0)
                goto err;
        if (retval == 0)
                goto eio;
        if (i2c_debug) {
                printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
                if (!(xmit & BT878_I2C_NOSTOP))
                        printk(" >\n");
        }

        for (cnt = 1; cnt < msg->len; cnt++ ) {
                /* following bytes */
                xmit = (msg->buf[cnt] << 24) | I2C_HW | BT878_I2C_NOSTART;
                if (cnt < msg->len-1 || !last)
                        xmit |= BT878_I2C_NOSTOP;
                btwrite(xmit, BT848_I2C);
                retval = bttv_i2c_wait_done(btv);
                if (retval < 0)
                        goto err;
                if (retval == 0)
                        goto eio;
                if (i2c_debug) {
                        printk(" %02x", msg->buf[cnt]);
                        if (!(xmit & BT878_I2C_NOSTOP))
                                printk(" >\n");
                }
        }
        return msg->len;

 eio:
        retval = -EIO;
 err:
        if (i2c_debug)
                printk(" ERR: %d\n",retval);
        return retval;
}

static int
bttv_i2c_readbytes(struct bttv *btv, const struct i2c_msg *msg, int last)
{
        u32 xmit;
        u32 cnt;
        int retval;

        for(cnt = 0; cnt < msg->len; cnt++) {
                xmit = (msg->addr << 25) | (1 << 24) | I2C_HW;
                if (cnt < msg->len-1)
                        xmit |= BT848_I2C_W3B;
                if (cnt < msg->len-1 || !last)
                        xmit |= BT878_I2C_NOSTOP;
                if (cnt)
                        xmit |= BT878_I2C_NOSTART;
                btwrite(xmit, BT848_I2C);
                retval = bttv_i2c_wait_done(btv);
                if (retval < 0)
                        goto err;
                if (retval == 0)
                        goto eio;
                msg->buf[cnt] = ((u32)btread(BT848_I2C) >> 8) & 0xff;
                if (i2c_debug) {
                        if (!(xmit & BT878_I2C_NOSTART))
                                printk(" <R %02x", (msg->addr << 1) +1);
                        printk(" =%02x", msg->buf[cnt]);
                        if (!(xmit & BT878_I2C_NOSTOP))
                                printk(" >\n");
                }
        }
        return msg->len;

 eio:
        retval = -EIO;
 err:
        if (i2c_debug)
                printk(" ERR: %d\n",retval);
        return retval;
}

int bttv_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
{
        struct bttv *btv = i2c_get_adapdata(i2c_adap);
        int retval = 0;
        int i;

        if (i2c_debug)
                printk("bt-i2c:");
        btwrite(BT848_INT_I2CDONE|BT848_INT_RACK, BT848_INT_STAT);
        for (i = 0 ; i < num; i++) {
                if (msgs[i].flags & I2C_M_RD) {
                        /* read */
                        retval = bttv_i2c_readbytes(btv, &msgs[i], i+1 == num);
                        if (retval < 0)
                                goto err;
                } else {
                        /* write */
                        retval = bttv_i2c_sendbytes(btv, &msgs[i], i+1 == num);
                        if (retval < 0)
                                goto err;
                }
        }
        return num;

 err:
        return retval;
}

static struct i2c_algorithm bttv_algo = {
        .name          = "bt878",
        .id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
        .master_xfer   = bttv_i2c_xfer,
        .algo_control  = algo_control,
        .functionality = functionality,
};

static struct i2c_adapter bttv_i2c_adap_hw_template = {
#ifdef I2C_PEC
        .owner         = THIS_MODULE,
#else
        .inc_use       = bttv_inc_use,
        .dec_use       = bttv_dec_use,
#endif
#ifdef I2C_ADAP_CLASS_TV_ANALOG
        .class         = I2C_ADAP_CLASS_TV_ANALOG,
#endif
        I2C_DEVNAME("bt878"),
        .id            = I2C_ALGO_BIT | I2C_HW_B_BT848 /* FIXME */,
        .algo          = &bttv_algo,
        .client_register = attach_inform,
};

/* ----------------------------------------------------------------------- */
/* I2C functions - common stuff                                            */

#ifndef I2C_PEC
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;
}
#endif

static int attach_inform(struct i2c_client *client)
{
        struct bttv *btv = i2c_get_adapdata(client->adapter);

        if (btv->tuner_type != UNSET)
                bttv_call_i2c_clients(btv,TUNER_SET_TYPE,&btv->tuner_type);
        if (btv->pinnacle_id != UNSET)
                bttv_call_i2c_clients(btv,AUDC_CONFIG_PINNACLE,
                                      &btv->pinnacle_id);

        if (bttv_debug)
                printk("bttv%d: i2c attach [client=%s]\n",
                       btv->nr, i2c_clientname(client));
        return 0;
}

void bttv_call_i2c_clients(struct bttv *btv, unsigned int cmd, void *arg)
{
        if (0 != btv->i2c_rc)
                return;
        i2c_clients_command(&btv->i2c_adap, cmd, arg);
}

void bttv_i2c_call(unsigned int card, unsigned int cmd, void *arg)
{
        if (card >= bttv_num)
                return;
        bttv_call_i2c_clients(&bttvs[card], cmd, arg);
}

static struct i2c_client bttv_i2c_client_template = {
        I2C_DEVNAME("bttv internal"),
        .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(KERN_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(KERN_WARNING "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 __devinit bttv_readee(struct bttv *btv, unsigned char *eedata, int addr)
{
        int i;
       
        if (bttv_I2CWrite(btv, addr, 0, -1, 0)<0) {
                printk(KERN_WARNING "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(KERN_WARNING "bttv: readee error\n");
                        break;
                }
        }
}

/* init + register i2c algo-bit adapter */
int __devinit init_bttv_i2c(struct bttv *btv)
{
        int use_hw = (btv->id == 878) && i2c_hw;

        memcpy(&btv->i2c_client, &bttv_i2c_client_template,
               sizeof(bttv_i2c_client_template));

        if (use_hw) {
                /* bt878 */
                memcpy(&btv->i2c_adap, &bttv_i2c_adap_hw_template,
                       sizeof(bttv_i2c_adap_hw_template));
        } else {
                /* bt848 */
                memcpy(&btv->i2c_adap, &bttv_i2c_adap_sw_template,
                       sizeof(bttv_i2c_adap_sw_template));
                memcpy(&btv->i2c_algo, &bttv_i2c_algo_bit_template,
                       sizeof(bttv_i2c_algo_bit_template));
                btv->i2c_algo.data = btv;
                btv->i2c_adap.algo_data = &btv->i2c_algo;
        }

        btv->i2c_adap.dev.parent = &btv->dev->dev;
        snprintf26(btv->i2c_adap.name, sizeof(btv->i2c_adap.name),
                 "bt%d #%d [%s]", btv->id, btv->nr, use_hw ? "hw" : "sw");

        i2c_set_adapdata(&btv->i2c_adap, btv);
        btv->i2c_client.adapter = &btv->i2c_adap;

        if (use_hw) {
                btv->i2c_rc = i2c_add_adapter(&btv->i2c_adap);
        } else {
                bttv_bit_setscl(btv,1);
                bttv_bit_setsda(btv,1);
                btv->i2c_rc = i2c_bit_add_bus(&btv->i2c_adap);
        }
        return btv->i2c_rc;
}

int __devexit fini_bttv_i2c(struct bttv *btv)
{
        int use_hw = (btv->id == 878) && i2c_hw;

        if (0 != btv->i2c_rc)
                return 0;

        if (use_hw) {
                return i2c_del_adapter(&btv->i2c_adap);
        } else {
                return i2c_bit_del_bus(&btv->i2c_adap);
        }
}

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