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linux/drivers/gpu/drm/i915/dvo_tfp410.c
Keith Packard f9c10a9b96 drm/i915: Change I2C api to pass around i2c_adapters 
The existing API passed around intel_i2c_chan pointers, which are dependent
on the i2c bit-banging algo. This precluded the driver from using outputs
which use a different algo. Switching to the more general i2c_adpater allows
the driver to support non bit-banging DDC.

This also required moving the slave address into the output private
structures.

Signed-off-by: Keith Packard <keithp@keithp.com>
2009-06-18 15:53:57 -07:00

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/*
* Copyright © 2007 Dave Mueller
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Dave Mueller <dave.mueller@gmx.ch>
*
*/
#include "dvo.h"
/* register definitions according to the TFP410 data sheet */
#define TFP410_VID 0x014C
#define TFP410_DID 0x0410
#define TFP410_VID_LO 0x00
#define TFP410_VID_HI 0x01
#define TFP410_DID_LO 0x02
#define TFP410_DID_HI 0x03
#define TFP410_REV 0x04
#define TFP410_CTL_1 0x08
#define TFP410_CTL_1_TDIS (1<<6)
#define TFP410_CTL_1_VEN (1<<5)
#define TFP410_CTL_1_HEN (1<<4)
#define TFP410_CTL_1_DSEL (1<<3)
#define TFP410_CTL_1_BSEL (1<<2)
#define TFP410_CTL_1_EDGE (1<<1)
#define TFP410_CTL_1_PD (1<<0)
#define TFP410_CTL_2 0x09
#define TFP410_CTL_2_VLOW (1<<7)
#define TFP410_CTL_2_MSEL_MASK (0x7<<4)
#define TFP410_CTL_2_MSEL (1<<4)
#define TFP410_CTL_2_TSEL (1<<3)
#define TFP410_CTL_2_RSEN (1<<2)
#define TFP410_CTL_2_HTPLG (1<<1)
#define TFP410_CTL_2_MDI (1<<0)
#define TFP410_CTL_3 0x0A
#define TFP410_CTL_3_DK_MASK (0x7<<5)
#define TFP410_CTL_3_DK (1<<5)
#define TFP410_CTL_3_DKEN (1<<4)
#define TFP410_CTL_3_CTL_MASK (0x7<<1)
#define TFP410_CTL_3_CTL (1<<1)
#define TFP410_USERCFG 0x0B
#define TFP410_DE_DLY 0x32
#define TFP410_DE_CTL 0x33
#define TFP410_DE_CTL_DEGEN (1<<6)
#define TFP410_DE_CTL_VSPOL (1<<5)
#define TFP410_DE_CTL_HSPOL (1<<4)
#define TFP410_DE_CTL_DEDLY8 (1<<0)
#define TFP410_DE_TOP 0x34
#define TFP410_DE_CNT_LO 0x36
#define TFP410_DE_CNT_HI 0x37
#define TFP410_DE_LIN_LO 0x38
#define TFP410_DE_LIN_HI 0x39
#define TFP410_H_RES_LO 0x3A
#define TFP410_H_RES_HI 0x3B
#define TFP410_V_RES_LO 0x3C
#define TFP410_V_RES_HI 0x3D
struct tfp410_save_rec {
uint8_t ctl1;
uint8_t ctl2;
};
struct tfp410_priv {
bool quiet;
struct tfp410_save_rec saved_reg;
struct tfp410_save_rec mode_reg;
};
static bool tfp410_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
{
struct tfp410_priv *tfp = dvo->dev_priv;
struct i2c_adapter *adapter = dvo->i2c_bus;
struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
u8 out_buf[2];
u8 in_buf[2];
struct i2c_msg msgs[] = {
{
.addr = dvo->slave_addr,
.flags = 0,
.len = 1,
.buf = out_buf,
},
{
.addr = dvo->slave_addr,
.flags = I2C_M_RD,
.len = 1,
.buf = in_buf,
}
};
out_buf[0] = addr;
out_buf[1] = 0;
if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) {
*ch = in_buf[0];
return true;
};
if (!tfp->quiet) {
DRM_DEBUG("Unable to read register 0x%02x from %s:%02x.\n",
addr, i2cbus->adapter.name, dvo->slave_addr);
}
return false;
}
static bool tfp410_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
{
struct tfp410_priv *tfp = dvo->dev_priv;
struct i2c_adapter *adapter = dvo->i2c_bus;
struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
uint8_t out_buf[2];
struct i2c_msg msg = {
.addr = dvo->slave_addr,
.flags = 0,
.len = 2,
.buf = out_buf,
};
out_buf[0] = addr;
out_buf[1] = ch;
if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1)
return true;
if (!tfp->quiet) {
DRM_DEBUG("Unable to write register 0x%02x to %s:%d.\n",
addr, i2cbus->adapter.name, dvo->slave_addr);
}
return false;
}
static int tfp410_getid(struct intel_dvo_device *dvo, int addr)
{
uint8_t ch1, ch2;
if (tfp410_readb(dvo, addr+0, &ch1) &&
tfp410_readb(dvo, addr+1, &ch2))
return ((ch2 << 8) & 0xFF00) | (ch1 & 0x00FF);
return -1;
}
/* Ti TFP410 driver for chip on i2c bus */
static bool tfp410_init(struct intel_dvo_device *dvo,
struct i2c_adapter *adapter)
{
/* this will detect the tfp410 chip on the specified i2c bus */
struct tfp410_priv *tfp;
int id;
tfp = kzalloc(sizeof(struct tfp410_priv), GFP_KERNEL);
if (tfp == NULL)
return false;
dvo->i2c_bus = adapter;
dvo->dev_priv = tfp;
tfp->quiet = true;
if ((id = tfp410_getid(dvo, TFP410_VID_LO)) != TFP410_VID) {
DRM_DEBUG("tfp410 not detected got VID %X: from %s Slave %d.\n",
id, adapter->name, dvo->slave_addr);
goto out;
}
if ((id = tfp410_getid(dvo, TFP410_DID_LO)) != TFP410_DID) {
DRM_DEBUG("tfp410 not detected got DID %X: from %s Slave %d.\n",
id, adapter->name, dvo->slave_addr);
goto out;
}
tfp->quiet = false;
return true;
out:
kfree(tfp);
return false;
}
static enum drm_connector_status tfp410_detect(struct intel_dvo_device *dvo)
{
enum drm_connector_status ret = connector_status_disconnected;
uint8_t ctl2;
if (tfp410_readb(dvo, TFP410_CTL_2, &ctl2)) {
if (ctl2 & TFP410_CTL_2_HTPLG)
ret = connector_status_connected;
else
ret = connector_status_disconnected;
}
return ret;
}
static enum drm_mode_status tfp410_mode_valid(struct intel_dvo_device *dvo,
struct drm_display_mode *mode)
{
return MODE_OK;
}
static void tfp410_mode_set(struct intel_dvo_device *dvo,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
/* As long as the basics are set up, since we don't have clock dependencies
* in the mode setup, we can just leave the registers alone and everything
* will work fine.
*/
/* don't do much */
return;
}
/* set the tfp410 power state */
static void tfp410_dpms(struct intel_dvo_device *dvo, int mode)
{
uint8_t ctl1;
if (!tfp410_readb(dvo, TFP410_CTL_1, &ctl1))
return;
if (mode == DRM_MODE_DPMS_ON)
ctl1 |= TFP410_CTL_1_PD;
else
ctl1 &= ~TFP410_CTL_1_PD;
tfp410_writeb(dvo, TFP410_CTL_1, ctl1);
}
static void tfp410_dump_regs(struct intel_dvo_device *dvo)
{
uint8_t val, val2;
tfp410_readb(dvo, TFP410_REV, &val);
DRM_DEBUG("TFP410_REV: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_CTL_1, &val);
DRM_DEBUG("TFP410_CTL1: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_CTL_2, &val);
DRM_DEBUG("TFP410_CTL2: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_CTL_3, &val);
DRM_DEBUG("TFP410_CTL3: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_USERCFG, &val);
DRM_DEBUG("TFP410_USERCFG: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_DE_DLY, &val);
DRM_DEBUG("TFP410_DE_DLY: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_DE_CTL, &val);
DRM_DEBUG("TFP410_DE_CTL: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_DE_TOP, &val);
DRM_DEBUG("TFP410_DE_TOP: 0x%02X\n", val);
tfp410_readb(dvo, TFP410_DE_CNT_LO, &val);
tfp410_readb(dvo, TFP410_DE_CNT_HI, &val2);
DRM_DEBUG("TFP410_DE_CNT: 0x%02X%02X\n", val2, val);
tfp410_readb(dvo, TFP410_DE_LIN_LO, &val);
tfp410_readb(dvo, TFP410_DE_LIN_HI, &val2);
DRM_DEBUG("TFP410_DE_LIN: 0x%02X%02X\n", val2, val);
tfp410_readb(dvo, TFP410_H_RES_LO, &val);
tfp410_readb(dvo, TFP410_H_RES_HI, &val2);
DRM_DEBUG("TFP410_H_RES: 0x%02X%02X\n", val2, val);
tfp410_readb(dvo, TFP410_V_RES_LO, &val);
tfp410_readb(dvo, TFP410_V_RES_HI, &val2);
DRM_DEBUG("TFP410_V_RES: 0x%02X%02X\n", val2, val);
}
static void tfp410_save(struct intel_dvo_device *dvo)
{
struct tfp410_priv *tfp = dvo->dev_priv;
if (!tfp410_readb(dvo, TFP410_CTL_1, &tfp->saved_reg.ctl1))
return;
if (!tfp410_readb(dvo, TFP410_CTL_2, &tfp->saved_reg.ctl2))
return;
}
static void tfp410_restore(struct intel_dvo_device *dvo)
{
struct tfp410_priv *tfp = dvo->dev_priv;
/* Restore it powered down initially */
tfp410_writeb(dvo, TFP410_CTL_1, tfp->saved_reg.ctl1 & ~0x1);
tfp410_writeb(dvo, TFP410_CTL_2, tfp->saved_reg.ctl2);
tfp410_writeb(dvo, TFP410_CTL_1, tfp->saved_reg.ctl1);
}
static void tfp410_destroy(struct intel_dvo_device *dvo)
{
struct tfp410_priv *tfp = dvo->dev_priv;
if (tfp) {
kfree(tfp);
dvo->dev_priv = NULL;
}
}
struct intel_dvo_dev_ops tfp410_ops = {
.init = tfp410_init,
.detect = tfp410_detect,
.mode_valid = tfp410_mode_valid,
.mode_set = tfp410_mode_set,
.dpms = tfp410_dpms,
.dump_regs = tfp410_dump_regs,
.save = tfp410_save,
.restore = tfp410_restore,
.destroy = tfp410_destroy,
};
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