/*
 * Copyright (C) 2010 Texas Instruments Inc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 2.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <linux/time.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/err.h>

#include <media/v4l2-device.h>
#include <media/davinci/vpbe_types.h>
#include <media/davinci/vpbe.h>
#include <media/davinci/vpss.h>
#include <media/davinci/vpbe_venc.h>

#define VPBE_DEFAULT_OUTPUT     "Composite"
#define VPBE_DEFAULT_MODE       "ntsc"

static char *def_output = VPBE_DEFAULT_OUTPUT;
static char *def_mode = VPBE_DEFAULT_MODE;
static int debug;

module_param(def_output, charp, S_IRUGO);
module_param(def_mode, charp, S_IRUGO);
module_param(debug, int, 0644);

MODULE_PARM_DESC(def_output, "vpbe output name (default:Composite)");
MODULE_PARM_DESC(def_mode, "vpbe output mode name (default:ntsc");
MODULE_PARM_DESC(debug, "Debug level 0-1");

MODULE_DESCRIPTION("TI DMXXX VPBE Display controller");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Texas Instruments");

/**
 * vpbe_current_encoder_info - Get config info for current encoder
 * @vpbe_dev - vpbe device ptr
 *
 * Return ptr to current encoder config info
 */
static struct encoder_config_info*
vpbe_current_encoder_info(struct vpbe_device *vpbe_dev)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int index = vpbe_dev->current_sd_index;

        return ((index == 0) ? &cfg->venc :
                                &cfg->ext_encoders[index-1]);
}

/**
 * vpbe_find_encoder_sd_index - Given a name find encoder sd index
 *
 * @vpbe_config - ptr to vpbe cfg
 * @output_index - index used by application
 *
 * Return sd index of the encoder
 */
static int vpbe_find_encoder_sd_index(struct vpbe_config *cfg,
                             int index)
{
        char *encoder_name = cfg->outputs[index].subdev_name;
        int i;

        /* Venc is always first */
        if (!strcmp(encoder_name, cfg->venc.module_name))
                return 0;

        for (i = 0; i < cfg->num_ext_encoders; i++) {
                if (!strcmp(encoder_name,
                     cfg->ext_encoders[i].module_name))
                        return i+1;
        }

        return -EINVAL;
}

/**
 * vpbe_g_cropcap - Get crop capabilities of the display
 * @vpbe_dev - vpbe device ptr
 * @cropcap - cropcap is a ptr to struct v4l2_cropcap
 *
 * Update the crop capabilities in crop cap for current
 * mode
 */
static int vpbe_g_cropcap(struct vpbe_device *vpbe_dev,
                          struct v4l2_cropcap *cropcap)
{
        if (!cropcap)
                return -EINVAL;
        cropcap->bounds.left = 0;
        cropcap->bounds.top = 0;
        cropcap->bounds.width = vpbe_dev->current_timings.xres;
        cropcap->bounds.height = vpbe_dev->current_timings.yres;
        cropcap->defrect = cropcap->bounds;

        return 0;
}

/**
 * vpbe_enum_outputs - enumerate outputs
 * @vpbe_dev - vpbe device ptr
 * @output - ptr to v4l2_output structure
 *
 * Enumerates the outputs available at the vpbe display
 * returns the status, -EINVAL if end of output list
 */
static int vpbe_enum_outputs(struct vpbe_device *vpbe_dev,
                             struct v4l2_output *output)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int temp_index = output->index;

        if (temp_index >= cfg->num_outputs)
                return -EINVAL;

        *output = cfg->outputs[temp_index].output;
        output->index = temp_index;

        return 0;
}

static int vpbe_get_mode_info(struct vpbe_device *vpbe_dev, char *mode,
                              int output_index)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        struct vpbe_enc_mode_info var;
        int curr_output = output_index;
        int i;

        if (!mode)
                return -EINVAL;

        for (i = 0; i < cfg->outputs[curr_output].num_modes; i++) {
                var = cfg->outputs[curr_output].modes[i];
                if (!strcmp(mode, var.name)) {
                        vpbe_dev->current_timings = var;
                        return 0;
                }
        }

        return -EINVAL;
}

static int vpbe_get_current_mode_info(struct vpbe_device *vpbe_dev,
                                      struct vpbe_enc_mode_info *mode_info)
{
        if (!mode_info)
                return -EINVAL;

        *mode_info = vpbe_dev->current_timings;

        return 0;
}

/* Get std by std id */
static int vpbe_get_std_info(struct vpbe_device *vpbe_dev,
                             v4l2_std_id std_id)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        struct vpbe_enc_mode_info var;
        int curr_output = vpbe_dev->current_out_index;
        int i;

        for (i = 0; i < vpbe_dev->cfg->outputs[curr_output].num_modes; i++) {
                var = cfg->outputs[curr_output].modes[i];
                if ((var.timings_type & VPBE_ENC_STD) &&
                  (var.std_id & std_id)) {
                        vpbe_dev->current_timings = var;
                        return 0;
                }
        }

        return -EINVAL;
}

static int vpbe_get_std_info_by_name(struct vpbe_device *vpbe_dev,
                                char *std_name)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        struct vpbe_enc_mode_info var;
        int curr_output = vpbe_dev->current_out_index;
        int i;

        for (i = 0; i < vpbe_dev->cfg->outputs[curr_output].num_modes; i++) {
                var = cfg->outputs[curr_output].modes[i];
                if (!strcmp(var.name, std_name)) {
                        vpbe_dev->current_timings = var;
                        return 0;
                }
        }

        return -EINVAL;
}

/**
 * vpbe_set_output - Set output
 * @vpbe_dev - vpbe device ptr
 * @index - index of output
 *
 * Set vpbe output to the output specified by the index
 */
static int vpbe_set_output(struct vpbe_device *vpbe_dev, int index)
{
        struct encoder_config_info *curr_enc_info =
                        vpbe_current_encoder_info(vpbe_dev);
        struct vpbe_config *cfg = vpbe_dev->cfg;
        struct venc_platform_data *venc_device = vpbe_dev->venc_device;
        int enc_out_index;
        int sd_index;
        int ret;

        if (index >= cfg->num_outputs)
                return -EINVAL;

        mutex_lock(&vpbe_dev->lock);

        sd_index = vpbe_dev->current_sd_index;
        enc_out_index = cfg->outputs[index].output.index;
        /*
         * Currently we switch the encoder based on output selected
         * by the application. If media controller is implemented later
         * there is will be an API added to setup_link between venc
         * and external encoder. So in that case below comparison always
         * match and encoder will not be switched. But if application
         * chose not to use media controller, then this provides current
         * way of switching encoder at the venc output.
         */
        if (strcmp(curr_enc_info->module_name,
                   cfg->outputs[index].subdev_name)) {
                /* Need to switch the encoder at the output */
                sd_index = vpbe_find_encoder_sd_index(cfg, index);
                if (sd_index < 0) {
                        ret = -EINVAL;
                        goto unlock;
                }

                ret = venc_device->setup_if_config(cfg->outputs[index].if_params);
                if (ret)
                        goto unlock;
        }

        /* Set output at the encoder */
        ret = v4l2_subdev_call(vpbe_dev->encoders[sd_index], video,
                                       s_routing, 0, enc_out_index, 0);
        if (ret)
                goto unlock;

        /*
         * It is assumed that venc or extenal encoder will set a default
         * mode in the sub device. For external encoder or LCD pannel output,
         * we also need to set up the lcd port for the required mode. So setup
         * the lcd port for the default mode that is configured in the board
         * arch/arm/mach-davinci/board-dm355-evm.setup file for the external
         * encoder.
         */
        ret = vpbe_get_mode_info(vpbe_dev,
                                 cfg->outputs[index].default_mode, index);
        if (!ret) {
                struct osd_state *osd_device = vpbe_dev->osd_device;

                osd_device->ops.set_left_margin(osd_device,
                        vpbe_dev->current_timings.left_margin);
                osd_device->ops.set_top_margin(osd_device,
                vpbe_dev->current_timings.upper_margin);
                vpbe_dev->current_sd_index = sd_index;
                vpbe_dev->current_out_index = index;
        }
unlock:
        mutex_unlock(&vpbe_dev->lock);
        return ret;
}

static int vpbe_set_default_output(struct vpbe_device *vpbe_dev)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int i;

        for (i = 0; i < cfg->num_outputs; i++) {
                if (!strcmp(def_output,
                            cfg->outputs[i].output.name)) {
                        int ret = vpbe_set_output(vpbe_dev, i);

                        if (!ret)
                                vpbe_dev->current_out_index = i;
                        return ret;
                }
        }
        return 0;
}

/**
 * vpbe_get_output - Get output
 * @vpbe_dev - vpbe device ptr
 *
 * return current vpbe output to the the index
 */
static unsigned int vpbe_get_output(struct vpbe_device *vpbe_dev)
{
        return vpbe_dev->current_out_index;
}

/**
 * vpbe_s_dv_timings - Set the given preset timings in the encoder
 *
 * Sets the timings if supported by the current encoder. Return the status.
 * 0 - success & -EINVAL on error
 */
static int vpbe_s_dv_timings(struct vpbe_device *vpbe_dev,
                    struct v4l2_dv_timings *dv_timings)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int out_index = vpbe_dev->current_out_index;
        struct vpbe_output *output = &cfg->outputs[out_index];
        int sd_index = vpbe_dev->current_sd_index;
        int ret, i;


        if (!(cfg->outputs[out_index].output.capabilities &
            V4L2_OUT_CAP_DV_TIMINGS))
                return -ENODATA;

        for (i = 0; i < output->num_modes; i++) {
                if (output->modes[i].timings_type == VPBE_ENC_DV_TIMINGS &&
                    !memcmp(&output->modes[i].dv_timings,
                                dv_timings, sizeof(*dv_timings)))
                        break;
        }
        if (i >= output->num_modes)
                return -EINVAL;
        vpbe_dev->current_timings = output->modes[i];
        mutex_lock(&vpbe_dev->lock);

        ret = v4l2_subdev_call(vpbe_dev->encoders[sd_index], video,
                                        s_dv_timings, dv_timings);
        if (!ret && vpbe_dev->amp) {
                /* Call amplifier subdevice */
                ret = v4l2_subdev_call(vpbe_dev->amp, video,
                                s_dv_timings, dv_timings);
        }
        /* set the lcd controller output for the given mode */
        if (!ret) {
                struct osd_state *osd_device = vpbe_dev->osd_device;

                osd_device->ops.set_left_margin(osd_device,
                vpbe_dev->current_timings.left_margin);
                osd_device->ops.set_top_margin(osd_device,
                vpbe_dev->current_timings.upper_margin);
        }
        mutex_unlock(&vpbe_dev->lock);

        return ret;
}

/**
 * vpbe_g_dv_timings - Get the timings in the current encoder
 *
 * Get the timings in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int vpbe_g_dv_timings(struct vpbe_device *vpbe_dev,
                     struct v4l2_dv_timings *dv_timings)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int out_index = vpbe_dev->current_out_index;

        if (!(cfg->outputs[out_index].output.capabilities &
                V4L2_OUT_CAP_DV_TIMINGS))
                return -ENODATA;

        if (vpbe_dev->current_timings.timings_type &
          VPBE_ENC_DV_TIMINGS) {
                *dv_timings = vpbe_dev->current_timings.dv_timings;
                return 0;
        }

        return -EINVAL;
}

/**
 * vpbe_enum_dv_timings - Enumerate the dv timings in the current encoder
 *
 * Get the timings in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int vpbe_enum_dv_timings(struct vpbe_device *vpbe_dev,
                         struct v4l2_enum_dv_timings *timings)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int out_index = vpbe_dev->current_out_index;
        struct vpbe_output *output = &cfg->outputs[out_index];
        int j = 0;
        int i;

        if (!(output->output.capabilities & V4L2_OUT_CAP_DV_TIMINGS))
                return -ENODATA;

        for (i = 0; i < output->num_modes; i++) {
                if (output->modes[i].timings_type == VPBE_ENC_DV_TIMINGS) {
                        if (j == timings->index)
                                break;
                        j++;
                }
        }

        if (i == output->num_modes)
                return -EINVAL;
        timings->timings = output->modes[i].dv_timings;
        return 0;
}

/**
 * vpbe_s_std - Set the given standard in the encoder
 *
 * Sets the standard if supported by the current encoder. Return the status.
 * 0 - success & -EINVAL on error
 */
static int vpbe_s_std(struct vpbe_device *vpbe_dev, v4l2_std_id std_id)
{
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int out_index = vpbe_dev->current_out_index;
        int sd_index = vpbe_dev->current_sd_index;
        int ret;

        if (!(cfg->outputs[out_index].output.capabilities &
                V4L2_OUT_CAP_STD))
                return -ENODATA;

        ret = vpbe_get_std_info(vpbe_dev, std_id);
        if (ret)
                return ret;

        mutex_lock(&vpbe_dev->lock);

        ret = v4l2_subdev_call(vpbe_dev->encoders[sd_index], video,
                               s_std_output, std_id);
        /* set the lcd controller output for the given mode */
        if (!ret) {
                struct osd_state *osd_device = vpbe_dev->osd_device;

                osd_device->ops.set_left_margin(osd_device,
                vpbe_dev->current_timings.left_margin);
                osd_device->ops.set_top_margin(osd_device,
                vpbe_dev->current_timings.upper_margin);
        }
        mutex_unlock(&vpbe_dev->lock);

        return ret;
}

/**
 * vpbe_g_std - Get the standard in the current encoder
 *
 * Get the standard in the current encoder. Return the status. 0 - success
 * -EINVAL on error
 */
static int vpbe_g_std(struct vpbe_device *vpbe_dev, v4l2_std_id *std_id)
{
        struct vpbe_enc_mode_info *cur_timings = &vpbe_dev->current_timings;
        struct vpbe_config *cfg = vpbe_dev->cfg;
        int out_index = vpbe_dev->current_out_index;

        if (!(cfg->outputs[out_index].output.capabilities & V4L2_OUT_CAP_STD))
                return -ENODATA;

        if (cur_timings->timings_type & VPBE_ENC_STD) {
                *std_id = cur_timings->std_id;
                return 0;
        }

        return -EINVAL;
}

/**
 * vpbe_set_mode - Set mode in the current encoder using mode info
 *
 * Use the mode string to decide what timings to set in the encoder
 * This is typically useful when fbset command is used to change the current
 * timings by specifying a string to indicate the timings.
 */
static int vpbe_set_mode(struct vpbe_device *vpbe_dev,
                         struct vpbe_enc_mode_info *mode_info)
{
        struct vpbe_enc_mode_info *preset_mode = NULL;
        struct vpbe_config *cfg = vpbe_dev->cfg;
        struct v4l2_dv_timings dv_timings;
        struct osd_state *osd_device;
        int out_index = vpbe_dev->current_out_index;
        int i;

        if (!mode_info || !mode_info->name)
                return -EINVAL;

        for (i = 0; i < cfg->outputs[out_index].num_modes; i++) {
                if (!strcmp(mode_info->name,
                     cfg->outputs[out_index].modes[i].name)) {
                        preset_mode = &cfg->outputs[out_index].modes[i];
                        /*
                         * it may be one of the 3 timings type. Check and
                         * invoke right API
                         */
                        if (preset_mode->timings_type & VPBE_ENC_STD)
                                return vpbe_s_std(vpbe_dev,
                                                 preset_mode->std_id);
                        if (preset_mode->timings_type &
                                                VPBE_ENC_DV_TIMINGS) {
                                dv_timings =
                                        preset_mode->dv_timings;
                                return vpbe_s_dv_timings(vpbe_dev, &dv_timings);
                        }
                }
        }

        /* Only custom timing should reach here */
        if (!preset_mode)
                return -EINVAL;

        mutex_lock(&vpbe_dev->lock);

        osd_device = vpbe_dev->osd_device;
        vpbe_dev->current_timings = *preset_mode;
        osd_device->ops.set_left_margin(osd_device,
                vpbe_dev->current_timings.left_margin);
        osd_device->ops.set_top_margin(osd_device,
                vpbe_dev->current_timings.upper_margin);

        mutex_unlock(&vpbe_dev->lock);
        return 0;
}

static int vpbe_set_default_mode(struct vpbe_device *vpbe_dev)
{
        int ret;

        ret = vpbe_get_std_info_by_name(vpbe_dev, def_mode);
        if (ret)
                return ret;

        /* set the default mode in the encoder */
        return vpbe_set_mode(vpbe_dev, &vpbe_dev->current_timings);
}

static int platform_device_get(struct device *dev, void *data)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct vpbe_device *vpbe_dev = data;

        if (strstr(pdev->name, "vpbe-osd"))
                vpbe_dev->osd_device = platform_get_drvdata(pdev);
        if (strstr(pdev->name, "vpbe-venc"))
                vpbe_dev->venc_device = dev_get_platdata(&pdev->dev);

        return 0;
}

/**
 * vpbe_initialize() - Initialize the vpbe display controller
 * @vpbe_dev - vpbe device ptr
 *
 * Master frame buffer device drivers calls this to initialize vpbe
 * display controller. This will then registers v4l2 device and the sub
 * devices and sets a current encoder sub device for display. v4l2 display
 * device driver is the master and frame buffer display device driver is
 * the slave. Frame buffer display driver checks the initialized during
 * probe and exit if not initialized. Returns status.
 */
static int vpbe_initialize(struct device *dev, struct vpbe_device *vpbe_dev)
{
        struct encoder_config_info *enc_info;
        struct amp_config_info *amp_info;
        struct v4l2_subdev **enc_subdev;
        struct osd_state *osd_device;
        struct i2c_adapter *i2c_adap;
        int num_encoders;
        int ret = 0;
        int err;
        int i;

        /*
         * v4l2 abd FBDev frame buffer devices will get the vpbe_dev pointer
         * from the platform device by iteration of platform drivers and
         * matching with device name
         */
        if (!vpbe_dev || !dev) {
                printk(KERN_ERR "Null device pointers.\n");
                return -ENODEV;
        }

        if (vpbe_dev->initialized)
                return 0;

        mutex_lock(&vpbe_dev->lock);

        if (strcmp(vpbe_dev->cfg->module_name, "dm644x-vpbe-display") != 0) {
                /* We have dac clock available for platform */
                vpbe_dev->dac_clk = clk_get(vpbe_dev->pdev, "vpss_dac");
                if (IS_ERR(vpbe_dev->dac_clk)) {
                        ret =  PTR_ERR(vpbe_dev->dac_clk);
                        goto fail_mutex_unlock;
                }
                if (clk_prepare_enable(vpbe_dev->dac_clk)) {
                        ret =  -ENODEV;
                        clk_put(vpbe_dev->dac_clk);
                        goto fail_mutex_unlock;
                }
        }

        /* first enable vpss clocks */
        vpss_enable_clock(VPSS_VPBE_CLOCK, 1);

        /* First register a v4l2 device */
        ret = v4l2_device_register(dev, &vpbe_dev->v4l2_dev);
        if (ret) {
                v4l2_err(dev->driver,
                        "Unable to register v4l2 device.\n");
                goto fail_clk_put;
        }
        v4l2_info(&vpbe_dev->v4l2_dev, "vpbe v4l2 device registered\n");

        err = bus_for_each_dev(&platform_bus_type, NULL, vpbe_dev,
                               platform_device_get);
        if (err < 0) {
                ret = err;
                goto fail_dev_unregister;
        }

        vpbe_dev->venc = venc_sub_dev_init(&vpbe_dev->v4l2_dev,
                                           vpbe_dev->cfg->venc.module_name);
        /* register venc sub device */
        if (!vpbe_dev->venc) {
                v4l2_err(&vpbe_dev->v4l2_dev,
                        "vpbe unable to init venc sub device\n");
                ret = -ENODEV;
                goto fail_dev_unregister;
        }
        /* initialize osd device */
        osd_device = vpbe_dev->osd_device;
        if (osd_device->ops.initialize) {
                err = osd_device->ops.initialize(osd_device);
                if (err) {
                        v4l2_err(&vpbe_dev->v4l2_dev,
                                 "unable to initialize the OSD device");
                        err = -ENOMEM;
                        goto fail_dev_unregister;
                }
        }

        /*
         * Register any external encoders that are configured. At index 0 we
         * store venc sd index.
         */
        num_encoders = vpbe_dev->cfg->num_ext_encoders + 1;
        vpbe_dev->encoders = kmalloc_array(num_encoders,
                                           sizeof(*vpbe_dev->encoders),
                                           GFP_KERNEL);
        if (!vpbe_dev->encoders) {
                ret = -ENOMEM;
                goto fail_dev_unregister;
        }

        i2c_adap = i2c_get_adapter(vpbe_dev->cfg->i2c_adapter_id);
        for (i = 0; i < (vpbe_dev->cfg->num_ext_encoders + 1); i++) {
                if (i == 0) {
                        /* venc is at index 0 */
                        enc_subdev = &vpbe_dev->encoders[i];
                        *enc_subdev = vpbe_dev->venc;
                        continue;
                }
                enc_info = &vpbe_dev->cfg->ext_encoders[i];
                if (enc_info->is_i2c) {
                        enc_subdev = &vpbe_dev->encoders[i];
                        *enc_subdev = v4l2_i2c_new_subdev_board(
                                                &vpbe_dev->v4l2_dev, i2c_adap,
                                                &enc_info->board_info, NULL);
                        if (*enc_subdev)
                                v4l2_info(&vpbe_dev->v4l2_dev,
                                          "v4l2 sub device %s registered\n",
                                          enc_info->module_name);
                        else {
                                v4l2_err(&vpbe_dev->v4l2_dev, "encoder %s failed to register",
                                         enc_info->module_name);
                                ret = -ENODEV;
                                goto fail_kfree_encoders;
                        }
                } else
                        v4l2_warn(&vpbe_dev->v4l2_dev, "non-i2c encoders currently not supported");
        }
        /* Add amplifier subdevice for dm365 */
        if ((strcmp(vpbe_dev->cfg->module_name, "dm365-vpbe-display") == 0) &&
           vpbe_dev->cfg->amp) {
                amp_info = vpbe_dev->cfg->amp;
                if (amp_info->is_i2c) {
                        vpbe_dev->amp = v4l2_i2c_new_subdev_board(
                        &vpbe_dev->v4l2_dev, i2c_adap,
                        &amp_info->board_info, NULL);
                        if (!vpbe_dev->amp) {
                                v4l2_err(&vpbe_dev->v4l2_dev,
                                         "amplifier %s failed to register",
                                         amp_info->module_name);
                                ret = -ENODEV;
                                goto fail_kfree_encoders;
                        }
                        v4l2_info(&vpbe_dev->v4l2_dev,
                                          "v4l2 sub device %s registered\n",
                                          amp_info->module_name);
                } else {
                            vpbe_dev->amp = NULL;
                            v4l2_warn(&vpbe_dev->v4l2_dev, "non-i2c amplifiers currently not supported");
                }
        } else {
            vpbe_dev->amp = NULL;
        }

        /* set the current encoder and output to that of venc by default */
        vpbe_dev->current_sd_index = 0;
        vpbe_dev->current_out_index = 0;

        mutex_unlock(&vpbe_dev->lock);

        printk(KERN_NOTICE "Setting default output to %s\n", def_output);
        ret = vpbe_set_default_output(vpbe_dev);
        if (ret) {
                v4l2_err(&vpbe_dev->v4l2_dev, "Failed to set default output %s",
                         def_output);
                return ret;
        }

        printk(KERN_NOTICE "Setting default mode to %s\n", def_mode);
        ret = vpbe_set_default_mode(vpbe_dev);
        if (ret) {
                v4l2_err(&vpbe_dev->v4l2_dev, "Failed to set default mode %s",
                         def_mode);
                return ret;
        }
        vpbe_dev->initialized = 1;
        /* TBD handling of bootargs for default output and mode */
        return 0;

fail_kfree_encoders:
        kfree(vpbe_dev->encoders);
fail_dev_unregister:
        v4l2_device_unregister(&vpbe_dev->v4l2_dev);
fail_clk_put:
        if (strcmp(vpbe_dev->cfg->module_name, "dm644x-vpbe-display") != 0) {
                clk_disable_unprepare(vpbe_dev->dac_clk);
                clk_put(vpbe_dev->dac_clk);
        }
fail_mutex_unlock:
        mutex_unlock(&vpbe_dev->lock);
        return ret;
}

/**
 * vpbe_deinitialize() - de-initialize the vpbe display controller
 * @dev - Master and slave device ptr
 *
 * vpbe_master and slave frame buffer devices calls this to de-initialize
 * the display controller. It is called when master and slave device
 * driver modules are removed and no longer requires the display controller.
 */
static void vpbe_deinitialize(struct device *dev, struct vpbe_device *vpbe_dev)
{
        v4l2_device_unregister(&vpbe_dev->v4l2_dev);
        if (strcmp(vpbe_dev->cfg->module_name, "dm644x-vpbe-display") != 0) {
                clk_disable_unprepare(vpbe_dev->dac_clk);
                clk_put(vpbe_dev->dac_clk);
        }

        kfree(vpbe_dev->amp);
        kfree(vpbe_dev->encoders);
        vpbe_dev->initialized = 0;
        /* disable vpss clocks */
        vpss_enable_clock(VPSS_VPBE_CLOCK, 0);
}

static struct vpbe_device_ops vpbe_dev_ops = {
        .g_cropcap = vpbe_g_cropcap,
        .enum_outputs = vpbe_enum_outputs,
        .set_output = vpbe_set_output,
        .get_output = vpbe_get_output,
        .s_dv_timings = vpbe_s_dv_timings,
        .g_dv_timings = vpbe_g_dv_timings,
        .enum_dv_timings = vpbe_enum_dv_timings,
        .s_std = vpbe_s_std,
        .g_std = vpbe_g_std,
        .initialize = vpbe_initialize,
        .deinitialize = vpbe_deinitialize,
        .get_mode_info = vpbe_get_current_mode_info,
        .set_mode = vpbe_set_mode,
};

static int vpbe_probe(struct platform_device *pdev)
{
        struct vpbe_device *vpbe_dev;
        struct vpbe_config *cfg;

        if (!pdev->dev.platform_data) {
                v4l2_err(pdev->dev.driver, "No platform data\n");
                return -ENODEV;
        }
        cfg = pdev->dev.platform_data;

        if (!cfg->module_name[0] ||
            !cfg->osd.module_name[0] ||
            !cfg->venc.module_name[0]) {
                v4l2_err(pdev->dev.driver, "vpbe display module names not defined\n");
                return -EINVAL;
        }

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

        vpbe_dev->cfg = cfg;
        vpbe_dev->ops = vpbe_dev_ops;
        vpbe_dev->pdev = &pdev->dev;

        if (cfg->outputs->num_modes > 0)
                vpbe_dev->current_timings = vpbe_dev->cfg->outputs[0].modes[0];
        else {
                kfree(vpbe_dev);
                return -ENODEV;
        }

        /* set the driver data in platform device */
        platform_set_drvdata(pdev, vpbe_dev);
        mutex_init(&vpbe_dev->lock);

        return 0;
}

static int vpbe_remove(struct platform_device *device)
{
        struct vpbe_device *vpbe_dev = platform_get_drvdata(device);

        kfree(vpbe_dev);

        return 0;
}

static struct platform_driver vpbe_driver = {
        .driver = {
                .name   = "vpbe_controller",
        },
        .probe = vpbe_probe,
        .remove = vpbe_remove,
};

module_platform_driver(vpbe_driver);