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viafb: via_i2c.c, via_i2c.h, viamode.c, viamode.h
via_i2c.c, via_i2c.h: Implement i2c specification. viamode.c, viamode.c: all support modes information. Signed-off-by: Joseph Chan <josephchan@via.com.tw> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Joseph Chan
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Linus Torvalds
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Oct 16, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| /* | ||
| * 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->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->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->i2c_stuff.adapter, msgs, 2); | ||
| return 0; | ||
| } | ||
|
|
||
| int viafb_create_i2c_bus(void *viapar) | ||
| { | ||
| int ret; | ||
| struct viafb_par *par = (struct viafb_par *)viapar; | ||
|
|
||
| strcpy(par->i2c_stuff.adapter.name, "via_i2c"); | ||
| par->i2c_stuff.i2c_port = 0x0; | ||
| par->i2c_stuff.adapter.owner = THIS_MODULE; | ||
| par->i2c_stuff.adapter.id = 0x01FFFF; | ||
| par->i2c_stuff.adapter.class = 0; | ||
| par->i2c_stuff.adapter.algo_data = &par->i2c_stuff.algo; | ||
| par->i2c_stuff.adapter.dev.parent = NULL; | ||
| par->i2c_stuff.algo.setsda = via_i2c_setsda; | ||
| par->i2c_stuff.algo.setscl = via_i2c_setscl; | ||
| par->i2c_stuff.algo.getsda = via_i2c_getsda; | ||
| par->i2c_stuff.algo.getscl = via_i2c_getscl; | ||
| par->i2c_stuff.algo.udelay = 40; | ||
| par->i2c_stuff.algo.timeout = 20; | ||
| par->i2c_stuff.algo.data = &par->i2c_stuff; | ||
|
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| i2c_set_adapdata(&par->i2c_stuff.adapter, &par->i2c_stuff); | ||
|
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| /* Raise SCL and SDA */ | ||
| par->i2c_stuff.i2c_port = I2CPORTINDEX; | ||
| via_i2c_setsda(&par->i2c_stuff, 1); | ||
| via_i2c_setscl(&par->i2c_stuff, 1); | ||
|
|
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| par->i2c_stuff.i2c_port = GPIOPORTINDEX; | ||
| via_i2c_setsda(&par->i2c_stuff, 1); | ||
| via_i2c_setscl(&par->i2c_stuff, 1); | ||
| udelay(20); | ||
|
|
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| ret = i2c_bit_add_bus(&par->i2c_stuff.adapter); | ||
| if (ret == 0) | ||
| DEBUG_MSG("I2C bus %s registered.\n", | ||
| par->i2c_stuff.adapter.name); | ||
| else | ||
| DEBUG_MSG("Failed to register I2C bus %s.\n", | ||
| par->i2c_stuff.adapter.name); | ||
| return ret; | ||
| } | ||
|
|
||
| void viafb_delete_i2c_buss(void *par) | ||
| { | ||
| i2c_del_adapter(&((struct viafb_par *)par)->i2c_stuff.adapter); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
| #ifndef __VIA_I2C_H__ | ||
| #define __VIA_I2C_H__ | ||
|
|
||
| #include <linux/i2c.h> | ||
| #include <linux/i2c-algo-bit.h> | ||
|
|
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| struct via_i2c_stuff { | ||
| u16 i2c_port; /* GPIO or I2C port */ | ||
| struct i2c_adapter adapter; | ||
| struct i2c_algo_bit_data algo; | ||
| }; | ||
|
|
||
| #define I2CPORT 0x3c4 | ||
| #define I2CPORTINDEX 0x31 | ||
| #define GPIOPORT 0x3C4 | ||
| #define GPIOPORTINDEX 0x2C | ||
| #define I2C_BUS 1 | ||
| #define GPIO_BUS 2 | ||
| #define DELAYPORT 0x3C3 | ||
|
|
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| int viafb_i2c_readbyte(u8 slave_addr, u8 index, u8 *pdata); | ||
| int viafb_i2c_writebyte(u8 slave_addr, u8 index, u8 data); | ||
| int viafb_i2c_readbytes(u8 slave_addr, u8 index, u8 *buff, int buff_len); | ||
| int viafb_create_i2c_bus(void *par); | ||
| void viafb_delete_i2c_buss(void *par); | ||
| #endif /* __VIA_I2C_H__ */ |
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