linux/drivers/video/via/via_i2c.c
Florian Tobias Schandinat c4df5489e4 viafb: improve viafb_par
This patch introduces viafb_shared and is the beginning of a smooth
transition to use it.

viafb_shared should contain all general, non-surface specific data that
should be shared along all viafb framebuffers while viafb_par should only
contain things that are specific to each surface or in other words extend
fb_info.  This change is intended to clean the dual/multi framebuffer
handling up.

This removes the annoyance that viafbinfo1->par points to a different
structure than viaparinfo1.

As the last change is fundamental it is difficult to ensure that all parts
of the driver do not depend on the previous brokenness but the chance of
regressions is very low.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Scott Fang <ScottFang@viatech.com.cn>
Cc: Joseph Chan <JosephChan@via.com.tw>
Cc: Harald Welte <laforge@gnumonks.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-23 07:39:52 -07:00

177 lines
4.5 KiB
C

/*
* Copyright 1998-2008 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 "global.h"
static void via_i2c_setscl(void *data, int state)
{
u8 val;
struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data;
val = viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0xF0;
if (state)
val |= 0x20;
else
val &= ~0x20;
switch (via_i2c_chan->i2c_port) {
case I2CPORTINDEX:
val |= 0x01;
break;
case GPIOPORTINDEX:
val |= 0x80;
break;
default:
DEBUG_MSG("via_i2c: specify wrong i2c port.\n");
}
viafb_write_reg(via_i2c_chan->i2c_port, VIASR, val);
}
static int via_i2c_getscl(void *data)
{
struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data;
if (viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0x08)
return 1;
return 0;
}
static int via_i2c_getsda(void *data)
{
struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data;
if (viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0x04)
return 1;
return 0;
}
static void via_i2c_setsda(void *data, int state)
{
u8 val;
struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data;
val = viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0xF0;
if (state)
val |= 0x10;
else
val &= ~0x10;
switch (via_i2c_chan->i2c_port) {
case I2CPORTINDEX:
val |= 0x01;
break;
case GPIOPORTINDEX:
val |= 0x40;
break;
default:
DEBUG_MSG("via_i2c: specify wrong i2c port.\n");
}
viafb_write_reg(via_i2c_chan->i2c_port, VIASR, val);
}
int viafb_i2c_readbyte(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;
i2c_transfer(&viaparinfo->shared->i2c_stuff.adapter, msgs, 2);
return 0;
}
int viafb_i2c_writebyte(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(&viaparinfo->shared->i2c_stuff.adapter, &msgs, 1);
}
int viafb_i2c_readbytes(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;
i2c_transfer(&viaparinfo->shared->i2c_stuff.adapter, msgs, 2);
return 0;
}
int viafb_create_i2c_bus(void *viapar)
{
int ret;
struct via_i2c_stuff *i2c_stuff =
&((struct viafb_par *)viapar)->shared->i2c_stuff;
strcpy(i2c_stuff->adapter.name, "via_i2c");
i2c_stuff->i2c_port = 0x0;
i2c_stuff->adapter.owner = THIS_MODULE;
i2c_stuff->adapter.id = 0x01FFFF;
i2c_stuff->adapter.class = 0;
i2c_stuff->adapter.algo_data = &i2c_stuff->algo;
i2c_stuff->adapter.dev.parent = NULL;
i2c_stuff->algo.setsda = via_i2c_setsda;
i2c_stuff->algo.setscl = via_i2c_setscl;
i2c_stuff->algo.getsda = via_i2c_getsda;
i2c_stuff->algo.getscl = via_i2c_getscl;
i2c_stuff->algo.udelay = 40;
i2c_stuff->algo.timeout = 20;
i2c_stuff->algo.data = i2c_stuff;
i2c_set_adapdata(&i2c_stuff->adapter, i2c_stuff);
/* Raise SCL and SDA */
i2c_stuff->i2c_port = I2CPORTINDEX;
via_i2c_setsda(i2c_stuff, 1);
via_i2c_setscl(i2c_stuff, 1);
i2c_stuff->i2c_port = GPIOPORTINDEX;
via_i2c_setsda(i2c_stuff, 1);
via_i2c_setscl(i2c_stuff, 1);
udelay(20);
ret = i2c_bit_add_bus(&i2c_stuff->adapter);
if (ret == 0)
DEBUG_MSG("I2C bus %s registered.\n", i2c_stuff->adapter.name);
else
DEBUG_MSG("Failed to register I2C bus %s.\n",
i2c_stuff->adapter.name);
return ret;
}
void viafb_delete_i2c_buss(void *par)
{
i2c_del_adapter(&((struct viafb_par *)par)->shared->i2c_stuff.adapter);
}