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/*

 *

 * Copyright (c) 2012 Gilles Dartiguelongue, Thomas Richter

 *

 * All Rights Reserved.

 *

 * 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, sub license, 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 NON-INFRINGEMENT.

 * IN NO EVENT SHALL THE AUTHOR 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.

 *

 */

#include "dvo.h"

#include "i915_reg.h"

#include "i915_drv.h"

#define NS2501_VID 0x1305

#define NS2501_DID 0x6726

#define NS2501_VID_LO 0x00

#define NS2501_VID_HI 0x01

#define NS2501_DID_LO 0x02

#define NS2501_DID_HI 0x03

#define NS2501_REV 0x04

#define NS2501_RSVD 0x05

#define NS2501_FREQ_LO 0x06

#define NS2501_FREQ_HI 0x07

#define NS2501_REG8 0x08

#define NS2501_8_VEN (1<<5)

#define NS2501_8_HEN (1<<4)

#define NS2501_8_DSEL (1<<3)

#define NS2501_8_BPAS (1<<2)

#define NS2501_8_RSVD (1<<1)

#define NS2501_8_PD (1<<0)

#define NS2501_REG9 0x09

#define NS2501_9_VLOW (1<<7)

#define NS2501_9_MSEL_MASK (0x7<<4)

#define NS2501_9_TSEL (1<<3)

#define NS2501_9_RSEN (1<<2)

#define NS2501_9_RSVD (1<<1)

#define NS2501_9_MDI (1<<0)

#define NS2501_REGC 0x0c

struct ns2501_priv {

	//I2CDevRec d;

	bool quiet;

	int reg_8_shadow;

	int reg_8_set;

	// Shadow registers for i915

	int dvoc;

	int pll_a;

	int srcdim;

	int fw_blc;

};

#define NSPTR(d) ((NS2501Ptr)(d->DriverPrivate.ptr))

/*

 * For reasons unclear to me, the ns2501 at least on the Fujitsu/Siemens

 * laptops does not react on the i2c bus unless

 * both the PLL is running and the display is configured in its native

 * resolution.

 * This function forces the DVO on, and stores the registers it touches.

 * Afterwards, registers are restored to regular values.

 *

 * This is pretty much a hack, though it works.

 * Without that, ns2501_readb and ns2501_writeb fail

 * when switching the resolution.

 */

static void enable_dvo(struct intel_dvo_device *dvo)

{

	struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);

	struct i2c_adapter *adapter = dvo->i2c_bus;

	struct intel_gmbus *bus = container_of(adapter,

					       struct intel_gmbus,

					       adapter);

	struct drm_i915_private *dev_priv = bus->dev_priv;

	DRM_DEBUG_KMS("%s: Trying to re-enable the DVO\n", __FUNCTION__);

	ns->dvoc = I915_READ(DVO_C);

	ns->pll_a = I915_READ(_DPLL_A);

	ns->srcdim = I915_READ(DVOC_SRCDIM);

	ns->fw_blc = I915_READ(FW_BLC);

	I915_WRITE(DVOC, 0x10004084);

	I915_WRITE(_DPLL_A, 0xd0820000);

	I915_WRITE(DVOC_SRCDIM, 0x400300);	// 1024x768

	I915_WRITE(FW_BLC, 0x1080304);

	I915_WRITE(DVOC, 0x90004084);

}

/*

 * Restore the I915 registers modified by the above

 * trigger function.

 */

static void restore_dvo(struct intel_dvo_device *dvo)

{

	struct i2c_adapter *adapter = dvo->i2c_bus;

	struct intel_gmbus *bus = container_of(adapter,

					       struct intel_gmbus,

					       adapter);

	struct drm_i915_private *dev_priv = bus->dev_priv;

	struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);

	I915_WRITE(DVOC, ns->dvoc);

	I915_WRITE(_DPLL_A, ns->pll_a);

	I915_WRITE(DVOC_SRCDIM, ns->srcdim);

	I915_WRITE(FW_BLC, ns->fw_blc);

}

/*

** Read a register from the ns2501.

** Returns true if successful, false otherwise.

** If it returns false, it might be wise to enable the

** DVO with the above function.

*/

static bool ns2501_readb(struct intel_dvo_device *dvo, int addr, uint8_t * ch)

{

	struct ns2501_priv *ns = dvo->dev_priv;

	struct i2c_adapter *adapter = dvo->i2c_bus;

	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(adapter, msgs, 2) == 2) {

		*ch = in_buf[0];

		return true;

	};

	if (!ns->quiet) {

		DRM_DEBUG_KMS

		    ("Unable to read register 0x%02x from %s:0x%02x.\n", addr,

		     adapter->name, dvo->slave_addr);

	}

	return false;

}

/*

** Write a register to the ns2501.

** Returns true if successful, false otherwise.

** If it returns false, it might be wise to enable the

** DVO with the above function.

*/

static bool ns2501_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)

{

	struct ns2501_priv *ns = dvo->dev_priv;

	struct i2c_adapter *adapter = dvo->i2c_bus;

	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(adapter, &msg, 1) == 1) {

		return true;

	}

	if (!ns->quiet) {

		DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d\n",

			      addr, adapter->name, dvo->slave_addr);

	}

	return false;

}

/* National Semiconductor 2501 driver for chip on i2c bus

 * scan for the chip on the bus.

 * Hope the VBIOS initialized the PLL correctly so we can

 * talk to it. If not, it will not be seen and not detected.

 * Bummer!

 */

static bool ns2501_init(struct intel_dvo_device *dvo,

			struct i2c_adapter *adapter)

{

	/* this will detect the NS2501 chip on the specified i2c bus */

	struct ns2501_priv *ns;

	unsigned char ch;

	ns = kzalloc(sizeof(struct ns2501_priv), GFP_KERNEL);

	if (ns == NULL)

		return false;

	dvo->i2c_bus = adapter;

	dvo->dev_priv = ns;

	ns->quiet = true;

	if (!ns2501_readb(dvo, NS2501_VID_LO, &ch))

		goto out;

	if (ch != (NS2501_VID & 0xff)) {

		DRM_DEBUG_KMS("ns2501 not detected got %d: from %s Slave %d.\n",

			      ch, adapter->name, dvo->slave_addr);

		goto out;

	}

	if (!ns2501_readb(dvo, NS2501_DID_LO, &ch))

		goto out;

	if (ch != (NS2501_DID & 0xff)) {

		DRM_DEBUG_KMS("ns2501 not detected got %d: from %s Slave %d.\n",

			      ch, adapter->name, dvo->slave_addr);

		goto out;

	}

	ns->quiet = false;

	ns->reg_8_set = 0;

	ns->reg_8_shadow =

	    NS2501_8_PD | NS2501_8_BPAS | NS2501_8_VEN | NS2501_8_HEN;

	DRM_DEBUG_KMS("init ns2501 dvo controller successfully!\n");

	return true;

out:

	kfree(ns);

	return false;

}

static enum drm_connector_status ns2501_detect(struct intel_dvo_device *dvo)

{

	/*

	 * This is a Laptop display, it doesn't have hotplugging.

	 * Even if not, the detection bit of the 2501 is unreliable as

	 * it only works for some display types.

	 * It is even more unreliable as the PLL must be active for

	 * allowing reading from the chiop.

	 */

	return connector_status_connected;

}

static enum drm_mode_status ns2501_mode_valid(struct intel_dvo_device *dvo,

					      struct drm_display_mode *mode)

{

	DRM_DEBUG_KMS

	    ("%s: is mode valid (hdisplay=%d,htotal=%d,vdisplay=%d,vtotal=%d)\n",

	     __FUNCTION__, mode->hdisplay, mode->htotal, mode->vdisplay,

	     mode->vtotal);

	/*

	 * Currently, these are all the modes I have data from.

	 * More might exist. Unclear how to find the native resolution

	 * of the panel in here so we could always accept it

	 * by disabling the scaler.

	 */

	if ((mode->hdisplay == 800 && mode->vdisplay == 600) ||

	    (mode->hdisplay == 640 && mode->vdisplay == 480) ||

	    (mode->hdisplay == 1024 && mode->vdisplay == 768)) {

		return MODE_OK;

	} else {

		return MODE_ONE_SIZE;	/* Is this a reasonable error? */

	}

}

static void ns2501_mode_set(struct intel_dvo_device *dvo,

			    struct drm_display_mode *mode,

			    struct drm_display_mode *adjusted_mode)

{

	bool ok;

	bool restore = false;

	struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);

	DRM_DEBUG_KMS

	    ("%s: set mode (hdisplay=%d,htotal=%d,vdisplay=%d,vtotal=%d).\n",

	     __FUNCTION__, mode->hdisplay, mode->htotal, mode->vdisplay,

	     mode->vtotal);

	/*

	 * Where do I find the native resolution for which scaling is not required???

	 *

	 * First trigger the DVO on as otherwise the chip does not appear on the i2c

	 * bus.

	 */

	do {

		ok = true;

		if (mode->hdisplay == 800 && mode->vdisplay == 600) {

			/* mode 277 */

			ns->reg_8_shadow &= ~NS2501_8_BPAS;

			DRM_DEBUG_KMS("%s: switching to 800x600\n",

				      __FUNCTION__);

			/*

			 * No, I do not know where this data comes from.

			 * It is just what the video bios left in the DVO, so

			 * I'm just copying it here over.

			 * This also means that I cannot support any other modes

			 * except the ones supported by the bios.

			 */

			ok &= ns2501_writeb(dvo, 0x11, 0xc8);	// 0xc7 also works.

			ok &= ns2501_writeb(dvo, 0x1b, 0x19);

			ok &= ns2501_writeb(dvo, 0x1c, 0x62);	// VBIOS left 0x64 here, but 0x62 works nicer

			ok &= ns2501_writeb(dvo, 0x1d, 0x02);

			ok &= ns2501_writeb(dvo, 0x34, 0x03);

			ok &= ns2501_writeb(dvo, 0x35, 0xff);

			ok &= ns2501_writeb(dvo, 0x80, 0x27);

			ok &= ns2501_writeb(dvo, 0x81, 0x03);

			ok &= ns2501_writeb(dvo, 0x82, 0x41);

			ok &= ns2501_writeb(dvo, 0x83, 0x05);

			ok &= ns2501_writeb(dvo, 0x8d, 0x02);

			ok &= ns2501_writeb(dvo, 0x8e, 0x04);

			ok &= ns2501_writeb(dvo, 0x8f, 0x00);

			ok &= ns2501_writeb(dvo, 0x90, 0xfe);	/* vertical. VBIOS left 0xff here, but 0xfe works better */

			ok &= ns2501_writeb(dvo, 0x91, 0x07);

			ok &= ns2501_writeb(dvo, 0x94, 0x00);

			ok &= ns2501_writeb(dvo, 0x95, 0x00);

			ok &= ns2501_writeb(dvo, 0x96, 0x00);

			ok &= ns2501_writeb(dvo, 0x99, 0x00);

			ok &= ns2501_writeb(dvo, 0x9a, 0x88);

			ok &= ns2501_writeb(dvo, 0x9c, 0x23);	/* Looks like first and last line of the image. */

			ok &= ns2501_writeb(dvo, 0x9d, 0x00);

			ok &= ns2501_writeb(dvo, 0x9e, 0x25);

			ok &= ns2501_writeb(dvo, 0x9f, 0x03);

			ok &= ns2501_writeb(dvo, 0xa4, 0x80);

			ok &= ns2501_writeb(dvo, 0xb6, 0x00);

			ok &= ns2501_writeb(dvo, 0xb9, 0xc8);	/* horizontal? */

			ok &= ns2501_writeb(dvo, 0xba, 0x00);	/* horizontal? */

			ok &= ns2501_writeb(dvo, 0xc0, 0x05);	/* horizontal? */

			ok &= ns2501_writeb(dvo, 0xc1, 0xd7);

			ok &= ns2501_writeb(dvo, 0xc2, 0x00);

			ok &= ns2501_writeb(dvo, 0xc3, 0xf8);

			ok &= ns2501_writeb(dvo, 0xc4, 0x03);

			ok &= ns2501_writeb(dvo, 0xc5, 0x1a);

			ok &= ns2501_writeb(dvo, 0xc6, 0x00);

			ok &= ns2501_writeb(dvo, 0xc7, 0x73);

			ok &= ns2501_writeb(dvo, 0xc8, 0x02);

		} else if (mode->hdisplay == 640 && mode->vdisplay == 480) {

			/* mode 274 */

			DRM_DEBUG_KMS("%s: switching to 640x480\n",

				      __FUNCTION__);

			/*

			 * No, I do not know where this data comes from.

			 * It is just what the video bios left in the DVO, so

			 * I'm just copying it here over.

			 * This also means that I cannot support any other modes

			 * except the ones supported by the bios.

			 */

			ns->reg_8_shadow &= ~NS2501_8_BPAS;

			ok &= ns2501_writeb(dvo, 0x11, 0xa0);

			ok &= ns2501_writeb(dvo, 0x1b, 0x11);

			ok &= ns2501_writeb(dvo, 0x1c, 0x54);

			ok &= ns2501_writeb(dvo, 0x1d, 0x03);

			ok &= ns2501_writeb(dvo, 0x34, 0x03);

			ok &= ns2501_writeb(dvo, 0x35, 0xff);

			ok &= ns2501_writeb(dvo, 0x80, 0xff);

			ok &= ns2501_writeb(dvo, 0x81, 0x07);

			ok &= ns2501_writeb(dvo, 0x82, 0x3d);

			ok &= ns2501_writeb(dvo, 0x83, 0x05);

			ok &= ns2501_writeb(dvo, 0x8d, 0x02);

			ok &= ns2501_writeb(dvo, 0x8e, 0x10);

			ok &= ns2501_writeb(dvo, 0x8f, 0x00);

			ok &= ns2501_writeb(dvo, 0x90, 0xff);	/* vertical */

			ok &= ns2501_writeb(dvo, 0x91, 0x07);

			ok &= ns2501_writeb(dvo, 0x94, 0x00);

			ok &= ns2501_writeb(dvo, 0x95, 0x00);

			ok &= ns2501_writeb(dvo, 0x96, 0x05);

			ok &= ns2501_writeb(dvo, 0x99, 0x00);

			ok &= ns2501_writeb(dvo, 0x9a, 0x88);

			ok &= ns2501_writeb(dvo, 0x9c, 0x24);

			ok &= ns2501_writeb(dvo, 0x9d, 0x00);

			ok &= ns2501_writeb(dvo, 0x9e, 0x25);

			ok &= ns2501_writeb(dvo, 0x9f, 0x03);

			ok &= ns2501_writeb(dvo, 0xa4, 0x84);

			ok &= ns2501_writeb(dvo, 0xb6, 0x09);

			ok &= ns2501_writeb(dvo, 0xb9, 0xa0);	/* horizontal? */

			ok &= ns2501_writeb(dvo, 0xba, 0x00);	/* horizontal? */

			ok &= ns2501_writeb(dvo, 0xc0, 0x05);	/* horizontal? */

			ok &= ns2501_writeb(dvo, 0xc1, 0x90);

			ok &= ns2501_writeb(dvo, 0xc2, 0x00);

			ok &= ns2501_writeb(dvo, 0xc3, 0x0f);

			ok &= ns2501_writeb(dvo, 0xc4, 0x03);

			ok &= ns2501_writeb(dvo, 0xc5, 0x16);

			ok &= ns2501_writeb(dvo, 0xc6, 0x00);

			ok &= ns2501_writeb(dvo, 0xc7, 0x02);

			ok &= ns2501_writeb(dvo, 0xc8, 0x02);

		} else if (mode->hdisplay == 1024 && mode->vdisplay == 768) {

			/* mode 280 */

			DRM_DEBUG_KMS("%s: switching to 1024x768\n",

				      __FUNCTION__);

			/*

			 * This might or might not work, actually. I'm silently

			 * assuming here that the native panel resolution is

			 * 1024x768. If not, then this leaves the scaler disabled

			 * generating a picture that is likely not the expected.

			 *

			 * Problem is that I do not know where to take the panel

			 * dimensions from.

			 *

			 * Enable the bypass, scaling not required.

			 *

			 * The scaler registers are irrelevant here....

			 *

			 */

			ns->reg_8_shadow |= NS2501_8_BPAS;

			ok &= ns2501_writeb(dvo, 0x37, 0x44);

		} else {

			/*

			 * Data not known. Bummer!

			 * Hopefully, the code should not go here

			 * as mode_OK delivered no other modes.

			 */

			ns->reg_8_shadow |= NS2501_8_BPAS;

		}

		ok &= ns2501_writeb(dvo, NS2501_REG8, ns->reg_8_shadow);

		if (!ok) {

			if (restore)

				restore_dvo(dvo);

			enable_dvo(dvo);

			restore = true;

		}

	} while (!ok);

	/*

	 * Restore the old i915 registers before

	 * forcing the ns2501 on.

	 */

	if (restore)

		restore_dvo(dvo);

}

/* set the NS2501 power state */

static bool ns2501_get_hw_state(struct intel_dvo_device *dvo)

{

	unsigned char ch;

	if (!ns2501_readb(dvo, NS2501_REG8, &ch))

		return false;

	if (ch & NS2501_8_PD)

		return true;

	else

		return false;

}

/* set the NS2501 power state */

static void ns2501_dpms(struct intel_dvo_device *dvo, bool enable)

{

	bool ok;

	bool restore = false;

	struct ns2501_priv *ns = (struct ns2501_priv *)(dvo->dev_priv);

	unsigned char ch;

	DRM_DEBUG_KMS("%s: Trying set the dpms of the DVO to %i\n",

		      __FUNCTION__, enable);

	ch = ns->reg_8_shadow;

	if (enable)

		ch |= NS2501_8_PD;

	else

		ch &= ~NS2501_8_PD;

	if (ns->reg_8_set == 0 || ns->reg_8_shadow != ch) {

		ns->reg_8_set = 1;

		ns->reg_8_shadow = ch;

		do {

			ok = true;

			ok &= ns2501_writeb(dvo, NS2501_REG8, ch);

			ok &=

			    ns2501_writeb(dvo, 0x34,

					  enable ? 0x03 : 0x00);

			ok &=

			    ns2501_writeb(dvo, 0x35,

					  enable ? 0xff : 0x00);

			if (!ok) {

				if (restore)

					restore_dvo(dvo);

				enable_dvo(dvo);

				restore = true;

			}

		} while (!ok);

		if (restore)

			restore_dvo(dvo);

	}

}

static void ns2501_dump_regs(struct intel_dvo_device *dvo)

{

	uint8_t val;

	ns2501_readb(dvo, NS2501_FREQ_LO, &val);

	DRM_LOG_KMS("NS2501_FREQ_LO: 0x%02x\n", val);

	ns2501_readb(dvo, NS2501_FREQ_HI, &val);

	DRM_LOG_KMS("NS2501_FREQ_HI: 0x%02x\n", val);

	ns2501_readb(dvo, NS2501_REG8, &val);

	DRM_LOG_KMS("NS2501_REG8: 0x%02x\n", val);

	ns2501_readb(dvo, NS2501_REG9, &val);

	DRM_LOG_KMS("NS2501_REG9: 0x%02x\n", val);

	ns2501_readb(dvo, NS2501_REGC, &val);

	DRM_LOG_KMS("NS2501_REGC: 0x%02x\n", val);

}

static void ns2501_destroy(struct intel_dvo_device *dvo)

{

	struct ns2501_priv *ns = dvo->dev_priv;

	if (ns) {

		kfree(ns);

		dvo->dev_priv = NULL;

	}

}

struct intel_dvo_dev_ops ns2501_ops = {

	.init = ns2501_init,

	.detect = ns2501_detect,

	.mode_valid = ns2501_mode_valid,

	.mode_set = ns2501_mode_set,

	.dpms = ns2501_dpms,

	.get_hw_state = ns2501_get_hw_state,

	.dump_regs = ns2501_dump_regs,

	.destroy = ns2501_destroy,

};