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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.
*/
#define __NO_VERSION__ 1
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <asm/io.h>
#include "bttvp.h"
#include "tuner.h"
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;
EXPORT_SYMBOL(bttv_get_cardinfo);
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);
/* ----------------------------------------------------------------------- */
/* 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_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printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n");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 */
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 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)
printk("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)
printk("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(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)
{
memcpy(&btv->i2c_adap, &bttv_i2c_adap_template,
sizeof(struct i2c_adapter));
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);
btv->i2c_rc = i2c_bit_add_bus(&btv->i2c_adap);
return btv->i2c_rc;
}
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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