drivers/gpu/drm/i915/dvo_tfp410.c - maze/linux - Git at Google

 /*
  * 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 intel_i2c_chan *i2cbus = dvo->i2c_bus;
 	u8 out_buf[2];
 	u8 in_buf[2];

 	struct i2c_msg msgs[] = {
 		{
 			.addr = i2cbus->slave_addr,
 			.flags = 0,
 			.len = 1,
 			.buf = out_buf,
 		},
 		{
 			.addr = i2cbus->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, i2cbus->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 intel_i2c_chan *i2cbus = dvo->i2c_bus;
 	uint8_t out_buf[2];
 	struct i2c_msg msg = {
 		.addr = i2cbus->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, i2cbus->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 intel_i2c_chan *i2cbus)
 {
 	/* 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 = i2cbus;
 	dvo->i2c_bus->slave_addr = dvo->slave_addr;
 	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, i2cbus->adapter.name, i2cbus->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, i2cbus->adapter.name, i2cbus->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,
 };
	/*
	* 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 intel_i2c_chan *i2cbus = dvo->i2c_bus;
	u8 out_buf[2];
	u8 in_buf[2];

	struct i2c_msg msgs[] = {
	{
	.addr = i2cbus->slave_addr,
	.flags = 0,
	.len = 1,
	.buf = out_buf,
	},
	{
	.addr = i2cbus->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, i2cbus->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 intel_i2c_chan *i2cbus = dvo->i2c_bus;
	uint8_t out_buf[2];
	struct i2c_msg msg = {
	.addr = i2cbus->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, i2cbus->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 intel_i2c_chan *i2cbus)
	{
	/* 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 = i2cbus;
	dvo->i2c_bus->slave_addr = dvo->slave_addr;
	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, i2cbus->adapter.name, i2cbus->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, i2cbus->adapter.name, i2cbus->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,
	};