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Message-Id: <2c4c8a8a73b64a8ea86ad85d8a59a5914d2f81ea.1329200232.git.FlorianSchandinat@gmx.de>
Date: Tue, 14 Feb 2012 06:35:02 +0000
From: Florian Tobias Schandinat <FlorianSchandinat@....de>
To: linux-fbdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [PATCH 2/3] viafb: fix I2C emulation on GPIO ports
This patch fixes the I2C emulation on GPIO ports by enabling it
(software controlled) and disabling the output on a GPIO line before
reading it.
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@....de>
---
drivers/video/via/via_i2c.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c
index 78f1405..dd53058 100644
--- a/drivers/video/via/via_i2c.c
+++ b/drivers/video/via/via_i2c.c
@@ -51,7 +51,7 @@ static void via_i2c_setscl(void *data, int state)
val |= 0x01;
break;
case VIA_PORT_GPIO:
- val |= 0x80;
+ val |= 0x82;
break;
default:
printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
@@ -67,6 +67,9 @@ static int via_i2c_getscl(void *data)
int ret = 0;
spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
+ if (adap_data->type == VIA_PORT_GPIO)
+ via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
+ 0, 0x80);
if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x08)
ret = 1;
spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
@@ -80,6 +83,9 @@ static int via_i2c_getsda(void *data)
int ret = 0;
spin_lock_irqsave(&i2c_vdev->reg_lock, flags);
+ if (adap_data->type == VIA_PORT_GPIO)
+ via_write_reg_mask(adap_data->io_port, adap_data->ioport_index,
+ 0, 0x40);
if (via_read_reg(adap_data->io_port, adap_data->ioport_index) & 0x04)
ret = 1;
spin_unlock_irqrestore(&i2c_vdev->reg_lock, flags);
@@ -103,7 +109,7 @@ static void via_i2c_setsda(void *data, int state)
val |= 0x01;
break;
case VIA_PORT_GPIO:
- val |= 0x40;
+ val |= 0x42;
break;
default:
printk(KERN_ERR "viafb_i2c: specify wrong i2c type.\n");
--
1.7.9
--
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