drivers/gpu/drm/i2c/ch7006_drv.c - kernel/bruno - Git at Google

 /*
  * Copyright (C) 2009 Francisco Jerez.
  * 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, 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 <linux/module.h>

 #include "ch7006_priv.h"

 /* DRM encoder functions */

 static void ch7006_encoder_set_config(struct drm_encoder *encoder,
 				      void *params)
 {
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);

 	priv->params = *(struct ch7006_encoder_params *)params;
 }

 static void ch7006_encoder_destroy(struct drm_encoder *encoder)
 {
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);

 	drm_property_destroy(encoder->dev, priv->scale_property);

 	kfree(priv);
 	to_encoder_slave(encoder)->slave_priv = NULL;

 	drm_i2c_encoder_destroy(encoder);
 }

 static void  ch7006_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
 	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);
 	struct ch7006_state *state = &priv->state;

 	ch7006_dbg(client, "\n");

 	if (mode == priv->last_dpms)
 		return;
 	priv->last_dpms = mode;

 	ch7006_setup_power_state(encoder);

 	ch7006_load_reg(client, state, CH7006_POWER);
 }

 static void ch7006_encoder_save(struct drm_encoder *encoder)
 {
 	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);

 	ch7006_dbg(client, "\n");

 	ch7006_state_save(client, &priv->saved_state);
 }

 static void ch7006_encoder_restore(struct drm_encoder *encoder)
 {
 	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);

 	ch7006_dbg(client, "\n");

 	ch7006_state_load(client, &priv->saved_state);
 }

 static bool ch7006_encoder_mode_fixup(struct drm_encoder *encoder,
 				      const struct drm_display_mode *mode,
 				      struct drm_display_mode *adjusted_mode)
 {
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);

 	/* The ch7006 is painfully picky with the input timings so no
 	 * custom modes for now... */

 	priv->mode = ch7006_lookup_mode(encoder, mode);

 	return !!priv->mode;
 }

 static int ch7006_encoder_mode_valid(struct drm_encoder *encoder,
 				     struct drm_display_mode *mode)
 {
 	if (ch7006_lookup_mode(encoder, mode))
 		return MODE_OK;
 	else
 		return MODE_BAD;
 }

 static void ch7006_encoder_mode_set(struct drm_encoder *encoder,
 				     struct drm_display_mode *drm_mode,
 				     struct drm_display_mode *adjusted_mode)
 {
 	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);
 	struct ch7006_encoder_params *params = &priv->params;
 	struct ch7006_state *state = &priv->state;
 	uint8_t *regs = state->regs;
 	const struct ch7006_mode *mode = priv->mode;
 	const struct ch7006_tv_norm_info *norm = &ch7006_tv_norms[priv->norm];
 	int start_active;

 	ch7006_dbg(client, "\n");

 	regs[CH7006_DISPMODE] = norm->dispmode | mode->dispmode;
 	regs[CH7006_BWIDTH] = 0;
 	regs[CH7006_INPUT_FORMAT] = bitf(CH7006_INPUT_FORMAT_FORMAT,
 					 params->input_format);

 	regs[CH7006_CLKMODE] = CH7006_CLKMODE_SUBC_LOCK
 		| bitf(CH7006_CLKMODE_XCM, params->xcm)
 		| bitf(CH7006_CLKMODE_PCM, params->pcm);
 	if (params->clock_mode)
 		regs[CH7006_CLKMODE] |= CH7006_CLKMODE_MASTER;
 	if (params->clock_edge)
 		regs[CH7006_CLKMODE] |= CH7006_CLKMODE_POS_EDGE;

 	start_active = (drm_mode->htotal & ~0x7) - (drm_mode->hsync_start & ~0x7);
 	regs[CH7006_POV] = bitf(CH7006_POV_START_ACTIVE_8, start_active);
 	regs[CH7006_START_ACTIVE] = bitf(CH7006_START_ACTIVE_0, start_active);

 	regs[CH7006_INPUT_SYNC] = 0;
 	if (params->sync_direction)
 		regs[CH7006_INPUT_SYNC] |= CH7006_INPUT_SYNC_OUTPUT;
 	if (params->sync_encoding)
 		regs[CH7006_INPUT_SYNC] |= CH7006_INPUT_SYNC_EMBEDDED;
 	if (drm_mode->flags & DRM_MODE_FLAG_PVSYNC)
 		regs[CH7006_INPUT_SYNC] |= CH7006_INPUT_SYNC_PVSYNC;
 	if (drm_mode->flags & DRM_MODE_FLAG_PHSYNC)
 		regs[CH7006_INPUT_SYNC] |= CH7006_INPUT_SYNC_PHSYNC;

 	regs[CH7006_DETECT] = 0;
 	regs[CH7006_BCLKOUT] = 0;

 	regs[CH7006_SUBC_INC3] = 0;
 	if (params->pout_level)
 		regs[CH7006_SUBC_INC3] |= CH7006_SUBC_INC3_POUT_3_3V;

 	regs[CH7006_SUBC_INC4] = 0;
 	if (params->active_detect)
 		regs[CH7006_SUBC_INC4] |= CH7006_SUBC_INC4_DS_INPUT;

 	regs[CH7006_PLL_CONTROL] = priv->saved_state.regs[CH7006_PLL_CONTROL];

 	ch7006_setup_levels(encoder);
 	ch7006_setup_subcarrier(encoder);
 	ch7006_setup_pll(encoder);
 	ch7006_setup_power_state(encoder);
 	ch7006_setup_properties(encoder);

 	ch7006_state_load(client, state);
 }

 static enum drm_connector_status ch7006_encoder_detect(struct drm_encoder *encoder,
 						       struct drm_connector *connector)
 {
 	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);
 	struct ch7006_state *state = &priv->state;
 	int det;

 	ch7006_dbg(client, "\n");

 	ch7006_save_reg(client, state, CH7006_DETECT);
 	ch7006_save_reg(client, state, CH7006_POWER);
 	ch7006_save_reg(client, state, CH7006_CLKMODE);

 	ch7006_write(client, CH7006_POWER, CH7006_POWER_RESET |
 					   bitfs(CH7006_POWER_LEVEL, NORMAL));
 	ch7006_write(client, CH7006_CLKMODE, CH7006_CLKMODE_MASTER);

 	ch7006_write(client, CH7006_DETECT, CH7006_DETECT_SENSE);

 	ch7006_write(client, CH7006_DETECT, 0);

 	det = ch7006_read(client, CH7006_DETECT);

 	ch7006_load_reg(client, state, CH7006_CLKMODE);
 	ch7006_load_reg(client, state, CH7006_POWER);
 	ch7006_load_reg(client, state, CH7006_DETECT);

 	if ((det & (CH7006_DETECT_SVIDEO_Y_TEST|
 		    CH7006_DETECT_SVIDEO_C_TEST|
 		    CH7006_DETECT_CVBS_TEST)) == 0)
 		priv->subconnector = DRM_MODE_SUBCONNECTOR_SCART;
 	else if ((det & (CH7006_DETECT_SVIDEO_Y_TEST|
 			 CH7006_DETECT_SVIDEO_C_TEST)) == 0)
 		priv->subconnector = DRM_MODE_SUBCONNECTOR_SVIDEO;
 	else if ((det & CH7006_DETECT_CVBS_TEST) == 0)
 		priv->subconnector = DRM_MODE_SUBCONNECTOR_Composite;
 	else
 		priv->subconnector = DRM_MODE_SUBCONNECTOR_Unknown;

 	drm_object_property_set_value(&connector->base,
 			encoder->dev->mode_config.tv_subconnector_property,
 							priv->subconnector);

 	return priv->subconnector ? connector_status_connected :
 					connector_status_disconnected;
 }

 static int ch7006_encoder_get_modes(struct drm_encoder *encoder,
 				    struct drm_connector *connector)
 {
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);
 	const struct ch7006_mode *mode;
 	int n = 0;

 	for (mode = ch7006_modes; mode->mode.clock; mode++) {
 		if (~mode->valid_scales & 1<<priv->scale ||
 		    ~mode->valid_norms & 1<<priv->norm)
 			continue;

 		drm_mode_probed_add(connector,
 				drm_mode_duplicate(encoder->dev, &mode->mode));

 		n++;
 	}

 	return n;
 }

 static int ch7006_encoder_create_resources(struct drm_encoder *encoder,
 					   struct drm_connector *connector)
 {
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);
 	struct drm_device *dev = encoder->dev;
 	struct drm_mode_config *conf = &dev->mode_config;

 	drm_mode_create_tv_properties(dev, NUM_TV_NORMS, ch7006_tv_norm_names);

 	priv->scale_property = drm_property_create_range(dev, 0, "scale", 0, 2);

 	drm_object_attach_property(&connector->base, conf->tv_select_subconnector_property,
 				      priv->select_subconnector);
 	drm_object_attach_property(&connector->base, conf->tv_subconnector_property,
 				      priv->subconnector);
 	drm_object_attach_property(&connector->base, conf->tv_left_margin_property,
 				      priv->hmargin);
 	drm_object_attach_property(&connector->base, conf->tv_bottom_margin_property,
 				      priv->vmargin);
 	drm_object_attach_property(&connector->base, conf->tv_mode_property,
 				      priv->norm);
 	drm_object_attach_property(&connector->base, conf->tv_brightness_property,
 				      priv->brightness);
 	drm_object_attach_property(&connector->base, conf->tv_contrast_property,
 				      priv->contrast);
 	drm_object_attach_property(&connector->base, conf->tv_flicker_reduction_property,
 				      priv->flicker);
 	drm_object_attach_property(&connector->base, priv->scale_property,
 				      priv->scale);

 	return 0;
 }

 static int ch7006_encoder_set_property(struct drm_encoder *encoder,
 				       struct drm_connector *connector,
 				       struct drm_property *property,
 				       uint64_t val)
 {
 	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
 	struct ch7006_priv *priv = to_ch7006_priv(encoder);
 	struct ch7006_state *state = &priv->state;
 	struct drm_mode_config *conf = &encoder->dev->mode_config;
 	struct drm_crtc *crtc = encoder->crtc;
 	bool modes_changed = false;

 	ch7006_dbg(client, "\n");

 	if (property == conf->tv_select_subconnector_property) {
 		priv->select_subconnector = val;

 		ch7006_setup_power_state(encoder);

 		ch7006_load_reg(client, state, CH7006_POWER);

 	} else if (property == conf->tv_left_margin_property) {
 		priv->hmargin = val;

 		ch7006_setup_properties(encoder);

 		ch7006_load_reg(client, state, CH7006_POV);
 		ch7006_load_reg(client, state, CH7006_HPOS);

 	} else if (property == conf->tv_bottom_margin_property) {
 		priv->vmargin = val;

 		ch7006_setup_properties(encoder);

 		ch7006_load_reg(client, state, CH7006_POV);
 		ch7006_load_reg(client, state, CH7006_VPOS);

 	} else if (property == conf->tv_mode_property) {
 		if (connector->dpms != DRM_MODE_DPMS_OFF)
 			return -EINVAL;

 		priv->norm = val;

 		modes_changed = true;

 	} else if (property == conf->tv_brightness_property) {
 		priv->brightness = val;

 		ch7006_setup_levels(encoder);

 		ch7006_load_reg(client, state, CH7006_BLACK_LEVEL);

 	} else if (property == conf->tv_contrast_property) {
 		priv->contrast = val;

 		ch7006_setup_properties(encoder);

 		ch7006_load_reg(client, state, CH7006_CONTRAST);

 	} else if (property == conf->tv_flicker_reduction_property) {
 		priv->flicker = val;

 		ch7006_setup_properties(encoder);

 		ch7006_load_reg(client, state, CH7006_FFILTER);

 	} else if (property == priv->scale_property) {
 		if (connector->dpms != DRM_MODE_DPMS_OFF)
 			return -EINVAL;

 		priv->scale = val;

 		modes_changed = true;

 	} else {
 		return -EINVAL;
 	}

 	if (modes_changed) {
 		drm_helper_probe_single_connector_modes(connector, 0, 0);

 		/* Disable the crtc to ensure a full modeset is
 		 * performed whenever it's turned on again. */
 		if (crtc) {
 			struct drm_mode_set modeset = {
 				.crtc = crtc,
 			};

 			drm_mode_set_config_internal(&modeset);
 		}
 	}

 	return 0;
 }

 static struct drm_encoder_slave_funcs ch7006_encoder_funcs = {
 	.set_config = ch7006_encoder_set_config,
 	.destroy = ch7006_encoder_destroy,
 	.dpms = ch7006_encoder_dpms,
 	.save = ch7006_encoder_save,
 	.restore = ch7006_encoder_restore,
 	.mode_fixup = ch7006_encoder_mode_fixup,
 	.mode_valid = ch7006_encoder_mode_valid,
 	.mode_set = ch7006_encoder_mode_set,
 	.detect = ch7006_encoder_detect,
 	.get_modes = ch7006_encoder_get_modes,
 	.create_resources = ch7006_encoder_create_resources,
 	.set_property = ch7006_encoder_set_property,
 };


 /* I2C driver functions */

 static int ch7006_probe(struct i2c_client *client, const struct i2c_device_id *id)
 {
 	uint8_t addr = CH7006_VERSION_ID;
 	uint8_t val;
 	int ret;

 	ch7006_dbg(client, "\n");

 	ret = i2c_master_send(client, &addr, sizeof(addr));
 	if (ret < 0)
 		goto fail;

 	ret = i2c_master_recv(client, &val, sizeof(val));
 	if (ret < 0)
 		goto fail;

 	ch7006_info(client, "Detected version ID: %x\n", val);

 	/* I don't know what this is for, but otherwise I get no
 	 * signal.
 	 */
 	ch7006_write(client, 0x3d, 0x0);

 	return 0;

 fail:
 	ch7006_err(client, "Error %d reading version ID\n", ret);

 	return -ENODEV;
 }

 static int ch7006_remove(struct i2c_client *client)
 {
 	ch7006_dbg(client, "\n");

 	return 0;
 }

 static int ch7006_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);

 	ch7006_dbg(client, "\n");

 	ch7006_write(client, 0x3d, 0x0);

 	return 0;
 }

 static int ch7006_encoder_init(struct i2c_client *client,
 			       struct drm_device *dev,
 			       struct drm_encoder_slave *encoder)
 {
 	struct ch7006_priv *priv;
 	int i;

 	ch7006_dbg(client, "\n");

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	encoder->slave_priv = priv;
 	encoder->slave_funcs = &ch7006_encoder_funcs;

 	priv->norm = TV_NORM_PAL;
 	priv->select_subconnector = DRM_MODE_SUBCONNECTOR_Automatic;
 	priv->subconnector = DRM_MODE_SUBCONNECTOR_Unknown;
 	priv->scale = 1;
 	priv->contrast = 50;
 	priv->brightness = 50;
 	priv->flicker = 50;
 	priv->hmargin = 50;
 	priv->vmargin = 50;
 	priv->last_dpms = -1;
 	priv->chip_version = ch7006_read(client, CH7006_VERSION_ID);

 	if (ch7006_tv_norm) {
 		for (i = 0; i < NUM_TV_NORMS; i++) {
 			if (!strcmp(ch7006_tv_norm_names[i], ch7006_tv_norm)) {
 				priv->norm = i;
 				break;
 			}
 		}

 		if (i == NUM_TV_NORMS)
 			ch7006_err(client, "Invalid TV norm setting \"%s\".\n",
 				   ch7006_tv_norm);
 	}

 	if (ch7006_scale >= 0 && ch7006_scale <= 2)
 		priv->scale = ch7006_scale;
 	else
 		ch7006_err(client, "Invalid scale setting \"%d\".\n",
 			   ch7006_scale);

 	return 0;
 }

 static struct i2c_device_id ch7006_ids[] = {
 	{ "ch7006", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ch7006_ids);

 static const struct dev_pm_ops ch7006_pm_ops = {
 	.resume = ch7006_resume,
 };

 static struct drm_i2c_encoder_driver ch7006_driver = {
 	.i2c_driver = {
 		.probe = ch7006_probe,
 		.remove = ch7006_remove,

 		.driver = {
 			.name = "ch7006",
 			.pm = &ch7006_pm_ops,
 		},

 		.id_table = ch7006_ids,
 	},

 	.encoder_init = ch7006_encoder_init,
 };


 /* Module initialization */

 static int __init ch7006_init(void)
 {
 	return drm_i2c_encoder_register(THIS_MODULE, &ch7006_driver);
 }

 static void __exit ch7006_exit(void)
 {
 	drm_i2c_encoder_unregister(&ch7006_driver);
 }

 int ch7006_debug;
 module_param_named(debug, ch7006_debug, int, 0600);
 MODULE_PARM_DESC(debug, "Enable debug output.");

 char *ch7006_tv_norm;
 module_param_named(tv_norm, ch7006_tv_norm, charp, 0600);
 MODULE_PARM_DESC(tv_norm, "Default TV norm.\n"
 		 "\t\tSupported: PAL, PAL-M, PAL-N, PAL-Nc, PAL-60, NTSC-M, NTSC-J.\n"
 		 "\t\tDefault: PAL");

 int ch7006_scale = 1;
 module_param_named(scale, ch7006_scale, int, 0600);
 MODULE_PARM_DESC(scale, "Default scale.\n"
 		 "\t\tSupported: 0 -> Select video modes with a higher blanking ratio.\n"
 		 "\t\t\t1 -> Select default video modes.\n"
 		 "\t\t\t2 -> Select video modes with a lower blanking ratio.");

 MODULE_AUTHOR("Francisco Jerez <currojerez@riseup.net>");
 MODULE_DESCRIPTION("Chrontel ch7006 TV encoder driver");
 MODULE_LICENSE("GPL and additional rights");

 module_init(ch7006_init);
 module_exit(ch7006_exit);
	/*
	* Copyright (C) 2009 Francisco Jerez.
	* 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, 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 COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS 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 <linux/module.h>

	#include "ch7006_priv.h"

	/* DRM encoder functions */

	static void ch7006_encoder_set_config(struct drm_encoder *encoder,
	void *params)
	{
	struct ch7006_priv *priv = to_ch7006_priv(encoder);

	priv->params = (struct ch7006_encoder_params )params;
	}

	static void ch7006_encoder_destroy(struct drm_encoder *encoder)
	{
	struct ch7006_priv *priv = to_ch7006_priv(encoder);

	drm_property_destroy(encoder->dev, priv->scale_property);

	kfree(priv);
	to_encoder_slave(encoder)->slave_priv = NULL;

	drm_i2c_encoder_destroy(encoder);
	}

	static void ch7006_encoder_dpms(struct drm_encoder *encoder, int mode)
	{
	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
	struct ch7006_priv *priv = to_ch7006_priv(encoder);
	struct ch7006_state *state = &priv->state;

	ch7006_dbg(client, "\n");

	if (mode == priv->last_dpms)
	return;
	priv->last_dpms = mode;

	ch7006_setup_power_state(encoder);

	ch7006_load_reg(client, state, CH7006_POWER);
	}

	static void ch7006_encoder_save(struct drm_encoder *encoder)
	{
	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
	struct ch7006_priv *priv = to_ch7006_priv(encoder);

	ch7006_dbg(client, "\n");

	ch7006_state_save(client, &priv->saved_state);
	}

	static void ch7006_encoder_restore(struct drm_encoder *encoder)
	{
	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
	struct ch7006_priv *priv = to_ch7006_priv(encoder);

	ch7006_dbg(client, "\n");

	ch7006_state_load(client, &priv->saved_state);
	}

	static bool ch7006_encoder_mode_fixup(struct drm_encoder *encoder,
	const struct drm_display_mode *mode,
	struct drm_display_mode *adjusted_mode)
	{
	struct ch7006_priv *priv = to_ch7006_priv(encoder);

	/* The ch7006 is painfully picky with the input timings so no
	* custom modes for now... */

	priv->mode = ch7006_lookup_mode(encoder, mode);

	return !!priv->mode;
	}

	static int ch7006_encoder_mode_valid(struct drm_encoder *encoder,
	struct drm_display_mode *mode)
	{
	if (ch7006_lookup_mode(encoder, mode))
	return MODE_OK;
	else
	return MODE_BAD;
	}

	static void ch7006_encoder_mode_set(struct drm_encoder *encoder,
	struct drm_display_mode *drm_mode,
	struct drm_display_mode *adjusted_mode)
	{
	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
	struct ch7006_priv *priv = to_ch7006_priv(encoder);
	struct ch7006_encoder_params *params = &priv->params;
	struct ch7006_state *state = &priv->state;
	uint8_t *regs = state->regs;
	const struct ch7006_mode *mode = priv->mode;
	const struct ch7006_tv_norm_info *norm = &ch7006_tv_norms[priv->norm];
	int start_active;

	ch7006_dbg(client, "\n");

	regs[CH7006_DISPMODE] = norm->dispmode \| mode->dispmode;
	regs[CH7006_BWIDTH] = 0;
	regs[CH7006_INPUT_FORMAT] = bitf(CH7006_INPUT_FORMAT_FORMAT,
	params->input_format);

	regs[CH7006_CLKMODE] = CH7006_CLKMODE_SUBC_LOCK
	\| bitf(CH7006_CLKMODE_XCM, params->xcm)
	\| bitf(CH7006_CLKMODE_PCM, params->pcm);
	if (params->clock_mode)
	regs[CH7006_CLKMODE] \|= CH7006_CLKMODE_MASTER;
	if (params->clock_edge)
	regs[CH7006_CLKMODE] \|= CH7006_CLKMODE_POS_EDGE;

	start_active = (drm_mode->htotal & ~0x7) - (drm_mode->hsync_start & ~0x7);
	regs[CH7006_POV] = bitf(CH7006_POV_START_ACTIVE_8, start_active);
	regs[CH7006_START_ACTIVE] = bitf(CH7006_START_ACTIVE_0, start_active);

	regs[CH7006_INPUT_SYNC] = 0;
	if (params->sync_direction)
	regs[CH7006_INPUT_SYNC] \|= CH7006_INPUT_SYNC_OUTPUT;
	if (params->sync_encoding)
	regs[CH7006_INPUT_SYNC] \|= CH7006_INPUT_SYNC_EMBEDDED;
	if (drm_mode->flags & DRM_MODE_FLAG_PVSYNC)
	regs[CH7006_INPUT_SYNC] \|= CH7006_INPUT_SYNC_PVSYNC;
	if (drm_mode->flags & DRM_MODE_FLAG_PHSYNC)
	regs[CH7006_INPUT_SYNC] \|= CH7006_INPUT_SYNC_PHSYNC;

	regs[CH7006_DETECT] = 0;
	regs[CH7006_BCLKOUT] = 0;

	regs[CH7006_SUBC_INC3] = 0;
	if (params->pout_level)
	regs[CH7006_SUBC_INC3] \|= CH7006_SUBC_INC3_POUT_3_3V;

	regs[CH7006_SUBC_INC4] = 0;
	if (params->active_detect)
	regs[CH7006_SUBC_INC4] \|= CH7006_SUBC_INC4_DS_INPUT;

	regs[CH7006_PLL_CONTROL] = priv->saved_state.regs[CH7006_PLL_CONTROL];

	ch7006_setup_levels(encoder);
	ch7006_setup_subcarrier(encoder);
	ch7006_setup_pll(encoder);
	ch7006_setup_power_state(encoder);
	ch7006_setup_properties(encoder);

	ch7006_state_load(client, state);
	}

	static enum drm_connector_status ch7006_encoder_detect(struct drm_encoder *encoder,
	struct drm_connector *connector)
	{
	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
	struct ch7006_priv *priv = to_ch7006_priv(encoder);
	struct ch7006_state *state = &priv->state;
	int det;

	ch7006_dbg(client, "\n");

	ch7006_save_reg(client, state, CH7006_DETECT);
	ch7006_save_reg(client, state, CH7006_POWER);
	ch7006_save_reg(client, state, CH7006_CLKMODE);

	ch7006_write(client, CH7006_POWER, CH7006_POWER_RESET \|
	bitfs(CH7006_POWER_LEVEL, NORMAL));
	ch7006_write(client, CH7006_CLKMODE, CH7006_CLKMODE_MASTER);

	ch7006_write(client, CH7006_DETECT, CH7006_DETECT_SENSE);

	ch7006_write(client, CH7006_DETECT, 0);

	det = ch7006_read(client, CH7006_DETECT);

	ch7006_load_reg(client, state, CH7006_CLKMODE);
	ch7006_load_reg(client, state, CH7006_POWER);
	ch7006_load_reg(client, state, CH7006_DETECT);

	if ((det & (CH7006_DETECT_SVIDEO_Y_TEST\|
	CH7006_DETECT_SVIDEO_C_TEST\|
	CH7006_DETECT_CVBS_TEST)) == 0)
	priv->subconnector = DRM_MODE_SUBCONNECTOR_SCART;
	else if ((det & (CH7006_DETECT_SVIDEO_Y_TEST\|
	CH7006_DETECT_SVIDEO_C_TEST)) == 0)
	priv->subconnector = DRM_MODE_SUBCONNECTOR_SVIDEO;
	else if ((det & CH7006_DETECT_CVBS_TEST) == 0)
	priv->subconnector = DRM_MODE_SUBCONNECTOR_Composite;
	else
	priv->subconnector = DRM_MODE_SUBCONNECTOR_Unknown;

	drm_object_property_set_value(&connector->base,
	encoder->dev->mode_config.tv_subconnector_property,
	priv->subconnector);

	return priv->subconnector ? connector_status_connected :
	connector_status_disconnected;
	}

	static int ch7006_encoder_get_modes(struct drm_encoder *encoder,
	struct drm_connector *connector)
	{
	struct ch7006_priv *priv = to_ch7006_priv(encoder);
	const struct ch7006_mode *mode;
	int n = 0;

	for (mode = ch7006_modes; mode->mode.clock; mode++) {
	if (~mode->valid_scales & 1<<priv->scale \|\|
	~mode->valid_norms & 1<<priv->norm)
	continue;

	drm_mode_probed_add(connector,
	drm_mode_duplicate(encoder->dev, &mode->mode));

	n++;
	}

	return n;
	}

	static int ch7006_encoder_create_resources(struct drm_encoder *encoder,
	struct drm_connector *connector)
	{
	struct ch7006_priv *priv = to_ch7006_priv(encoder);
	struct drm_device *dev = encoder->dev;
	struct drm_mode_config *conf = &dev->mode_config;

	drm_mode_create_tv_properties(dev, NUM_TV_NORMS, ch7006_tv_norm_names);

	priv->scale_property = drm_property_create_range(dev, 0, "scale", 0, 2);

	drm_object_attach_property(&connector->base, conf->tv_select_subconnector_property,
	priv->select_subconnector);
	drm_object_attach_property(&connector->base, conf->tv_subconnector_property,
	priv->subconnector);
	drm_object_attach_property(&connector->base, conf->tv_left_margin_property,
	priv->hmargin);
	drm_object_attach_property(&connector->base, conf->tv_bottom_margin_property,
	priv->vmargin);
	drm_object_attach_property(&connector->base, conf->tv_mode_property,
	priv->norm);
	drm_object_attach_property(&connector->base, conf->tv_brightness_property,
	priv->brightness);
	drm_object_attach_property(&connector->base, conf->tv_contrast_property,
	priv->contrast);
	drm_object_attach_property(&connector->base, conf->tv_flicker_reduction_property,
	priv->flicker);
	drm_object_attach_property(&connector->base, priv->scale_property,
	priv->scale);

	return 0;
	}

	static int ch7006_encoder_set_property(struct drm_encoder *encoder,
	struct drm_connector *connector,
	struct drm_property *property,
	uint64_t val)
	{
	struct i2c_client *client = drm_i2c_encoder_get_client(encoder);
	struct ch7006_priv *priv = to_ch7006_priv(encoder);
	struct ch7006_state *state = &priv->state;
	struct drm_mode_config *conf = &encoder->dev->mode_config;
	struct drm_crtc *crtc = encoder->crtc;
	bool modes_changed = false;

	ch7006_dbg(client, "\n");

	if (property == conf->tv_select_subconnector_property) {
	priv->select_subconnector = val;

	ch7006_setup_power_state(encoder);

	ch7006_load_reg(client, state, CH7006_POWER);

	} else if (property == conf->tv_left_margin_property) {
	priv->hmargin = val;

	ch7006_setup_properties(encoder);

	ch7006_load_reg(client, state, CH7006_POV);
	ch7006_load_reg(client, state, CH7006_HPOS);

	} else if (property == conf->tv_bottom_margin_property) {
	priv->vmargin = val;

	ch7006_setup_properties(encoder);

	ch7006_load_reg(client, state, CH7006_POV);
	ch7006_load_reg(client, state, CH7006_VPOS);

	} else if (property == conf->tv_mode_property) {
	if (connector->dpms != DRM_MODE_DPMS_OFF)
	return -EINVAL;

	priv->norm = val;

	modes_changed = true;

	} else if (property == conf->tv_brightness_property) {
	priv->brightness = val;

	ch7006_setup_levels(encoder);

	ch7006_load_reg(client, state, CH7006_BLACK_LEVEL);

	} else if (property == conf->tv_contrast_property) {
	priv->contrast = val;

	ch7006_setup_properties(encoder);

	ch7006_load_reg(client, state, CH7006_CONTRAST);

	} else if (property == conf->tv_flicker_reduction_property) {
	priv->flicker = val;

	ch7006_setup_properties(encoder);

	ch7006_load_reg(client, state, CH7006_FFILTER);

	} else if (property == priv->scale_property) {
	if (connector->dpms != DRM_MODE_DPMS_OFF)
	return -EINVAL;

	priv->scale = val;

	modes_changed = true;

	} else {
	return -EINVAL;
	}

	if (modes_changed) {
	drm_helper_probe_single_connector_modes(connector, 0, 0);

	/* Disable the crtc to ensure a full modeset is
	* performed whenever it's turned on again. */
	if (crtc) {
	struct drm_mode_set modeset = {
	.crtc = crtc,
	};

	drm_mode_set_config_internal(&modeset);
	}
	}

	return 0;
	}

	static struct drm_encoder_slave_funcs ch7006_encoder_funcs = {
	.set_config = ch7006_encoder_set_config,
	.destroy = ch7006_encoder_destroy,
	.dpms = ch7006_encoder_dpms,
	.save = ch7006_encoder_save,
	.restore = ch7006_encoder_restore,
	.mode_fixup = ch7006_encoder_mode_fixup,
	.mode_valid = ch7006_encoder_mode_valid,
	.mode_set = ch7006_encoder_mode_set,
	.detect = ch7006_encoder_detect,
	.get_modes = ch7006_encoder_get_modes,
	.create_resources = ch7006_encoder_create_resources,
	.set_property = ch7006_encoder_set_property,
	};


	/* I2C driver functions */

	static int ch7006_probe(struct i2c_client client, const struct i2c_device_id id)
	{
	uint8_t addr = CH7006_VERSION_ID;
	uint8_t val;
	int ret;

	ch7006_dbg(client, "\n");

	ret = i2c_master_send(client, &addr, sizeof(addr));
	if (ret < 0)
	goto fail;

	ret = i2c_master_recv(client, &val, sizeof(val));
	if (ret < 0)
	goto fail;

	ch7006_info(client, "Detected version ID: %x\n", val);

	/* I don't know what this is for, but otherwise I get no
	* signal.
	*/
	ch7006_write(client, 0x3d, 0x0);

	return 0;

	fail:
	ch7006_err(client, "Error %d reading version ID\n", ret);

	return -ENODEV;
	}

	static int ch7006_remove(struct i2c_client *client)
	{
	ch7006_dbg(client, "\n");

	return 0;
	}

	static int ch7006_resume(struct device *dev)
	{
	struct i2c_client *client = to_i2c_client(dev);

	ch7006_dbg(client, "\n");

	ch7006_write(client, 0x3d, 0x0);

	return 0;
	}

	static int ch7006_encoder_init(struct i2c_client *client,
	struct drm_device *dev,
	struct drm_encoder_slave *encoder)
	{
	struct ch7006_priv *priv;
	int i;

	ch7006_dbg(client, "\n");

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	encoder->slave_priv = priv;
	encoder->slave_funcs = &ch7006_encoder_funcs;

	priv->norm = TV_NORM_PAL;
	priv->select_subconnector = DRM_MODE_SUBCONNECTOR_Automatic;
	priv->subconnector = DRM_MODE_SUBCONNECTOR_Unknown;
	priv->scale = 1;
	priv->contrast = 50;
	priv->brightness = 50;
	priv->flicker = 50;
	priv->hmargin = 50;
	priv->vmargin = 50;
	priv->last_dpms = -1;
	priv->chip_version = ch7006_read(client, CH7006_VERSION_ID);

	if (ch7006_tv_norm) {
	for (i = 0; i < NUM_TV_NORMS; i++) {
	if (!strcmp(ch7006_tv_norm_names[i], ch7006_tv_norm)) {
	priv->norm = i;
	break;
	}
	}

	if (i == NUM_TV_NORMS)
	ch7006_err(client, "Invalid TV norm setting \"%s\".\n",
	ch7006_tv_norm);
	}

	if (ch7006_scale >= 0 && ch7006_scale <= 2)
	priv->scale = ch7006_scale;
	else
	ch7006_err(client, "Invalid scale setting \"%d\".\n",
	ch7006_scale);

	return 0;
	}

	static struct i2c_device_id ch7006_ids[] = {
	{ "ch7006", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, ch7006_ids);

	static const struct dev_pm_ops ch7006_pm_ops = {
	.resume = ch7006_resume,
	};

	static struct drm_i2c_encoder_driver ch7006_driver = {
	.i2c_driver = {
	.probe = ch7006_probe,
	.remove = ch7006_remove,

	.driver = {
	.name = "ch7006",
	.pm = &ch7006_pm_ops,
	},

	.id_table = ch7006_ids,
	},

	.encoder_init = ch7006_encoder_init,
	};


	/* Module initialization */

	static int __init ch7006_init(void)
	{
	return drm_i2c_encoder_register(THIS_MODULE, &ch7006_driver);
	}

	static void __exit ch7006_exit(void)
	{
	drm_i2c_encoder_unregister(&ch7006_driver);
	}

	int ch7006_debug;
	module_param_named(debug, ch7006_debug, int, 0600);
	MODULE_PARM_DESC(debug, "Enable debug output.");

	char *ch7006_tv_norm;
	module_param_named(tv_norm, ch7006_tv_norm, charp, 0600);
	MODULE_PARM_DESC(tv_norm, "Default TV norm.\n"
	"\t\tSupported: PAL, PAL-M, PAL-N, PAL-Nc, PAL-60, NTSC-M, NTSC-J.\n"
	"\t\tDefault: PAL");

	int ch7006_scale = 1;
	module_param_named(scale, ch7006_scale, int, 0600);
	MODULE_PARM_DESC(scale, "Default scale.\n"
	"\t\tSupported: 0 -> Select video modes with a higher blanking ratio.\n"
	"\t\t\t1 -> Select default video modes.\n"
	"\t\t\t2 -> Select video modes with a lower blanking ratio.");

	MODULE_AUTHOR("Francisco Jerez <currojerez@riseup.net>");
	MODULE_DESCRIPTION("Chrontel ch7006 TV encoder driver");
	MODULE_LICENSE("GPL and additional rights");

	module_init(ch7006_init);
	module_exit(ch7006_exit);