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| author |   Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2011-12-29 23:37:07 +0000 |
|---|---|---|
| committer | Florian Tobias Schandinat <FlorianSchandinat@gmx.de> | 2012-02-12 22:15:16 +0000 |
| commit | 2c4c8a8a73b64a8ea86ad85d8a59a5914d2f81ea (patch) | |
| tree | 5bd6026c0b94b208b7ff632651c3587fae5ff776 /drivers/video/via | |
| parent | viafb: add auxiliary device management infrastructure (diff) | |
| download | linux-dev-2c4c8a8a73b64a8ea86ad85d8a59a5914d2f81ea.tar.xz linux-dev-2c4c8a8a73b64a8ea86ad85d8a59a5914d2f81ea.zip | |
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@gmx.de>
Diffstat (limited to 'drivers/video/via')
| -rw-r--r-- | 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 78f1405dbab7..dd53058bbbb7 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"); |