/*
cx88-i2c.c -- all the i2c code is here
Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
& Marcus Metzler (mocm@thp.uni-koeln.de)
(c) 2002 Yurij Sysoev <yurij@naturesoft.net>
(c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
(c) 2005 Mauro Carvalho Chehab <mchehab@infradead.org>
- 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 int attach_inform(struct i2c_client *client)
{
struct cx88_core *core = i2c_get_adapdata(client->adapter);
dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
client->driver->driver.name, client->addr, client->name);
return 0;
}
static int detach_inform(struct i2c_client *client)
{
struct cx88_core *core = i2c_get_adapdata(client->adapter);
dprintk(1, "i2c detach [client=%s]\n", client->name);
return 0;
}
void cx88_call_i2c_clients(struct cx88_core *core, unsigned int cmd, void *arg)
{
if (0 != core->i2c_rc)
return;
#if defined(CONFIG_VIDEO_CX88_DVB) || defined(CONFIG_VIDEO_CX88_DVB_MODULE)
if ( (core->dvbdev) && (core->dvbdev->dvb.frontend) ) {
if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 1);
i2c_clients_command(&core->i2c_adap, cmd, arg);
if (core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl)
core->dvbdev->dvb.frontend->ops.i2c_gate_ctrl(core->dvbdev->dvb.frontend, 0);
} else
#endif
i2c_clients_command(&core->i2c_adap, cmd, arg);
}
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 char *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(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 algo-bit 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));
if (core->board.tuner_type != TUNER_ABSENT)
core->i2c_adap.class |= I2C_CLASS_TV_ANALOG;
if (core->board.mpeg & CX88_MPEG_DVB)
core->i2c_adap.class |= I2C_CLASS_TV_DIGITAL;
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_adap.id = I2C_HW_B_CX2388x;
core->i2c_adap.client_register = attach_inform;
core->i2c_adap.client_unregister = detach_inform;
core->i2c_algo.udelay = i2c_udelay;
core->i2c_algo.data = core;
i2c_set_adapdata(&core->i2c_adap,core);
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) {
dprintk(1, "i2c register ok\n");
if (i2c_scan)
do_i2c_scan(core->name,&core->i2c_client);
} else
printk("%s: i2c register FAILED\n", core->name);
return core->i2c_rc;
}
/* ----------------------------------------------------------------------- */
EXPORT_SYMBOL(cx88_call_i2c_clients);
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
