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>

1 files changed, 177 insertions, 0 deletions

diff --git a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c
new file mode 100644
index 00000000000..0f3ed4eb236
--- /dev/null
+++ b/drivers/video/via/via_i2c.c
@@ -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;
+
+	i2c_set_adapdata(&par->i2c_stuff.adapter, &par->i2c_stuff);
+
+	/* Raise SCL and SDA */
+	par->i2c_stuff.i2c_port = I2CPORTINDEX;
+	via_i2c_setsda(&par->i2c_stuff, 1);
+	via_i2c_setscl(&par->i2c_stuff, 1);
+
+	par->i2c_stuff.i2c_port = GPIOPORTINDEX;
+	via_i2c_setsda(&par->i2c_stuff, 1);
+	via_i2c_setscl(&par->i2c_stuff, 1);
+	udelay(20);
+
+	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);
+}