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/*
* Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
* 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, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; 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.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "via-core.h"
#include "via_i2c.h"
#include "global.h"
/*
* There can only be one set of these, so there's no point in having
* them be dynamically allocated...
*/
#define VIAFB_NUM_I2C 5
static struct via_i2c_stuff via_i2c_par[VIAFB_NUM_I2C];
static void via_i2c_setscl(void *data, int state)
{
u8 val;
struct via_port_cfg *adap_data = data;
val = viafb_read_reg(adap_data->io_port,
adap_data->ioport_index) & 0xF0;
if (state)
val |= 0x20;
else
val &= ~0x20;
switch (adap_data->type) {
case VIA_PORT_I2C:
val |= 0x01;
break;
case VIA_PORT_GPIO:
val |= 0x80;
break;
default:
DEBUG_MSG("viafb_i2c: specify wrong i2c type.\n");
}
viafb_write_reg(adap_data->ioport_index,
adap_data->io_port, val);
}
static int via_i2c_getscl(void *data)
{
struct via_port_cfg *adap_data = data;
if (viafb_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
return 1;
return 0;
}
static int via_i2c_getsda(void *data)
{
struct via_port_cfg *adap_data = data;
if (viafb_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
return 1;
return 0;
}
static void via_i2c_setsda(void *data, int state)
{
u8 val;
struct via_port_cfg *adap_data = data;
val = viafb_read_reg(adap_data->io_port,
adap_data->ioport_index) & 0xF0;
if (state)
val |= 0x10;
else
val &= ~0x10;
switch (adap_data->type) {
case VIA_PORT_I2C:
val |= 0x01;
break;
case VIA_PORT_GPIO:
val |= 0x40;
break;
default:
DEBUG_MSG("viafb_i2c: specify wrong i2c type.\n");
}
viafb_write_reg(adap_data->ioport_index,
adap_data->io_port, val);
}
int viafb_i2c_readbyte(u8 adap, u8 slave_addr, u8 index, u8 *pdata)
{
u8 mm1[] = {0x00};
struct i2c_msg msgs[2];
*pdata = 0;
msgs[0].flags = 0;
msgs[1].flags = I2C_M_RD;
msgs[0].addr = msgs[1].addr = slave_addr / 2;
mm1[0] = index;
msgs[0].len = 1; msgs[1].len = 1;
msgs[0].buf = mm1; msgs[1].buf = pdata;
return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
}
int viafb_i2c_writebyte(u8 adap, u8 slave_addr, u8 index, u8 data)
{
u8 msg[2] = { index, data };
struct i2c_msg msgs;
msgs.flags = 0;
msgs.addr = slave_addr / 2;
msgs.len = 2;
msgs.buf = msg;
return i2c_transfer(&via_i2c_par[adap].adapter, &msgs, 1);
}
int viafb_i2c_readbytes(u8 adap, u8 slave_addr, u8 index, u8 *buff, int buff_len)
{
u8 mm1[] = {0x00};
struct i2c_msg msgs[2];
msgs[0].flags = 0;
msgs[1].flags = I2C_M_RD;
msgs[0].addr = msgs[1].addr = slave_addr / 2;
mm1[0] = index;
msgs[0].len = 1; msgs[1].len = buff_len;
msgs[0].buf = mm1; msgs[1].buf = buff;
return i2c_transfer(&via_i2c_par[adap].adapter, msgs, 2);
}
static int create_i2c_bus(struct i2c_adapter *adapter,
struct i2c_algo_bit_data *algo,
struct via_port_cfg *adap_cfg,
struct pci_dev *pdev)
{
DEBUG_MSG(KERN_DEBUG "viafb: creating bus adap=0x%p, algo_bit_data=0x%p, adap_cfg=0x%p\n", adapter, algo, adap_cfg);
algo->setsda = via_i2c_setsda;
algo->setscl = via_i2c_setscl;
algo->getsda = via_i2c_getsda;
algo->getscl = via_i2c_getscl;
algo->udelay = 40;
algo->timeout = 20;
algo->data = adap_cfg;
sprintf(adapter->name, "viafb i2c io_port idx 0x%02x",
adap_cfg->ioport_index);
adapter->owner = THIS_MODULE;
adapter->id = 0x01FFFF;
adapter->class = I2C_CLASS_DDC;
adapter->algo_data = algo;
if (pdev)
adapter->dev.parent = &pdev->dev;
else
adapter->dev.parent = NULL;
/* i2c_set_adapdata(adapter, adap_cfg); */
/* Raise SCL and SDA */
via_i2c_setsda(adap_cfg, 1);
via_i2c_setscl(adap_cfg, 1);
udelay(20);
return i2c_bit_add_bus(adapter);
}
int viafb_create_i2c_busses(struct via_port_cfg *configs)
{
int i, ret;
for (i = 0; i < VIAFB_NUM_PORTS; i++) {
struct via_port_cfg *adap_cfg = configs++;
struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
if (adap_cfg->type == 0 || adap_cfg->mode != VIA_MODE_I2C)
continue;
ret = create_i2c_bus(&i2c_stuff->adapter,
&i2c_stuff->algo, adap_cfg,
NULL); /* FIXME: PCIDEV */
if (ret < 0) {
printk(KERN_ERR "viafb: cannot create i2c bus %u:%d\n",
i, ret);
/* FIXME: properly release previous busses */
return ret;
}
}
return 0;
}
void viafb_delete_i2c_busses(void)
{
int i;
for (i = 0; i < VIAFB_NUM_PORTS; i++) {
struct via_i2c_stuff *i2c_stuff = &via_i2c_par[i];
/*
* Only remove those entries in the array that we've
* actually used (and thus initialized algo_data)
*/
if (i2c_stuff->adapter.algo_data == &i2c_stuff->algo)
i2c_del_adapter(&i2c_stuff->adapter);
}
}
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