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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 <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/io.h>
#include "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 = 0;
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printk("bttv_get_id is obsolete, use bttv_get_cardinfo instead\n");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;
}
static int
bttv_i2c_wait_done(struct bttv *btv)
{
u32 stat;
unsigned long timeout;
timeout = jiffies + HZ/100 + 1; /* 10ms */
for (;;) {
stat = btread(BT848_INT_STAT);
if (stat & BT848_INT_I2CDONE)
break;
if (time_after(jiffies,timeout))
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;
snprintf(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:
*/
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