/* drivers/video/msm_fb/mddi_client_nt35399.c
 *
 * Support for Novatek NT35399 MDDI client of Sapphire
 *
 * Copyright (C) 2008 HTC Incorporated
 * Author: Solomon Chiu (solomon_chiu@htc.com)
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <mach/msm_fb.h>

static DECLARE_WAIT_QUEUE_HEAD(nt35399_vsync_wait);

struct panel_info {
        struct msm_mddi_client_data *client_data;
        struct platform_device pdev;
        struct msm_panel_data panel_data;
        struct msmfb_callback *fb_callback;
        struct work_struct panel_work;
        struct workqueue_struct *fb_wq;
        int nt35399_got_int;
};

static void
nt35399_request_vsync(struct msm_panel_data *panel_data,
                      struct msmfb_callback *callback)
{
        struct panel_info *panel = container_of(panel_data, struct panel_info,
                                                panel_data);
        struct msm_mddi_client_data *client_data = panel->client_data;

        panel->fb_callback = callback;
        if (panel->nt35399_got_int) {
                panel->nt35399_got_int = 0;
                client_data->activate_link(client_data); /* clears interrupt */
        }
}

static void nt35399_wait_vsync(struct msm_panel_data *panel_data)
{
        struct panel_info *panel = container_of(panel_data, struct panel_info,
                                                panel_data);
        struct msm_mddi_client_data *client_data = panel->client_data;

        if (panel->nt35399_got_int) {
                panel->nt35399_got_int = 0;
                client_data->activate_link(client_data); /* clears interrupt */
        }

        if (wait_event_timeout(nt35399_vsync_wait, panel->nt35399_got_int,
                                HZ/2) == 0)
                printk(KERN_ERR "timeout waiting for VSYNC\n");

        panel->nt35399_got_int = 0;
        /* interrupt clears when screen dma starts */
}

static int nt35399_suspend(struct msm_panel_data *panel_data)
{
        struct panel_info *panel = container_of(panel_data, struct panel_info,
                                                panel_data);
        struct msm_mddi_client_data *client_data = panel->client_data;

        struct msm_mddi_bridge_platform_data *bridge_data =
                client_data->private_client_data;
        int ret;

        ret = bridge_data->uninit(bridge_data, client_data);
        if (ret) {
                printk(KERN_INFO "mddi nt35399 client: non zero return from "
                        "uninit\n");
                return ret;
        }
        client_data->suspend(client_data);
        return 0;
}

static int nt35399_resume(struct msm_panel_data *panel_data)
{
        struct panel_info *panel = container_of(panel_data, struct panel_info,
                                                panel_data);
        struct msm_mddi_client_data *client_data = panel->client_data;

        struct msm_mddi_bridge_platform_data *bridge_data =
                client_data->private_client_data;
        int ret;

        client_data->resume(client_data);
        ret = bridge_data->init(bridge_data, client_data);
        if (ret)
                return ret;
        return 0;
}

static int nt35399_blank(struct msm_panel_data *panel_data)
{
        struct panel_info *panel = container_of(panel_data, struct panel_info,
                                                panel_data);
        struct msm_mddi_client_data *client_data = panel->client_data;
        struct msm_mddi_bridge_platform_data *bridge_data =
                client_data->private_client_data;

        return bridge_data->blank(bridge_data, client_data);
}

static int nt35399_unblank(struct msm_panel_data *panel_data)
{
        struct panel_info *panel = container_of(panel_data, struct panel_info,
                                                panel_data);
        struct msm_mddi_client_data *client_data = panel->client_data;
        struct msm_mddi_bridge_platform_data *bridge_data =
                client_data->private_client_data;

        return bridge_data->unblank(bridge_data, client_data);
}

irqreturn_t nt35399_vsync_interrupt(int irq, void *data)
{
        struct panel_info *panel = data;

        panel->nt35399_got_int = 1;

        if (panel->fb_callback) {
                panel->fb_callback->func(panel->fb_callback);
                panel->fb_callback = NULL;
        }

        wake_up(&nt35399_vsync_wait);

        return IRQ_HANDLED;
}

static int setup_vsync(struct panel_info *panel, int init)
{
        int ret;
        int gpio = 97;
        unsigned int irq;

        if (!init) {
                ret = 0;
                goto uninit;
        }
        ret = gpio_request(gpio, "vsync");
        if (ret)
                goto err_request_gpio_failed;

        ret = gpio_direction_input(gpio);
        if (ret)
                goto err_gpio_direction_input_failed;

        ret = irq = gpio_to_irq(gpio);
        if (ret < 0)
                goto err_get_irq_num_failed;

        ret = request_irq(irq, nt35399_vsync_interrupt, IRQF_TRIGGER_RISING,
                          "vsync", panel);
        if (ret)
                goto err_request_irq_failed;

        printk(KERN_INFO "vsync on gpio %d now %d\n",
               gpio, gpio_get_value(gpio));
        return 0;

uninit:
        free_irq(gpio_to_irq(gpio), panel->client_data);
err_request_irq_failed:
err_get_irq_num_failed:
err_gpio_direction_input_failed:
        gpio_free(gpio);
err_request_gpio_failed:
        return ret;
}

static int mddi_nt35399_probe(struct platform_device *pdev)
{
        struct msm_mddi_client_data *client_data = pdev->dev.platform_data;
        struct msm_mddi_bridge_platform_data *bridge_data =
                client_data->private_client_data;

        int ret;

        struct panel_info *panel = kzalloc(sizeof(struct panel_info),
                                           GFP_KERNEL);

        printk(KERN_DEBUG "%s: enter.\n", __func__);

        if (!panel)
                return -ENOMEM;
        platform_set_drvdata(pdev, panel);

        ret = setup_vsync(panel, 1);
        if (ret) {
                dev_err(&pdev->dev, "mddi_nt35399_setup_vsync failed\n");
                return ret;
        }

        panel->client_data = client_data;
        panel->panel_data.suspend = nt35399_suspend;
        panel->panel_data.resume = nt35399_resume;
        panel->panel_data.wait_vsync = nt35399_wait_vsync;
        panel->panel_data.request_vsync = nt35399_request_vsync;
        panel->panel_data.blank = nt35399_blank;
        panel->panel_data.unblank = nt35399_unblank;
        panel->panel_data.fb_data = &bridge_data->fb_data;
        panel->panel_data.caps = 0;

        panel->pdev.name = "msm_panel";
        panel->pdev.id = pdev->id;
        panel->pdev.resource = client_data->fb_resource;
        panel->pdev.num_resources = 1;
        panel->pdev.dev.platform_data = &panel->panel_data;

        if (bridge_data->init)
                bridge_data->init(bridge_data, client_data);

        platform_device_register(&panel->pdev);

        return 0;
}

static int mddi_nt35399_remove(struct platform_device *pdev)
{
        struct panel_info *panel = platform_get_drvdata(pdev);

        setup_vsync(panel, 0);
        kfree(panel);
        return 0;
}

static struct platform_driver mddi_client_0bda_8a47 = {
        .probe = mddi_nt35399_probe,
        .remove = mddi_nt35399_remove,
        .driver = { .name = "mddi_c_0bda_8a47" },
};

static int __init mddi_client_nt35399_init(void)
{
        return platform_driver_register(&mddi_client_0bda_8a47);
}

module_init(mddi_client_nt35399_init);