text: /* drivers/video/msm_fb/mddi_client_toshiba.c
   *
   * Support for Toshiba TC358720XBG mddi client devices which require no
   * special initialization code.
   *
   * Copyright (C) 2007 Google Incorporated
   *
   * 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/gpio.h>
  #include <linux/sched.h>
  #include <linux/slab.h>
  #include <linux/platform_data/video-msm_fb.h>
  
  
  #define LCD_CONTROL_BLOCK_BASE 0x110000
  #define CMN         (LCD_CONTROL_BLOCK_BASE|0x10)
  #define INTFLG      (LCD_CONTROL_BLOCK_BASE|0x18)
  #define HCYCLE      (LCD_CONTROL_BLOCK_BASE|0x34)
  #define HDE_START   (LCD_CONTROL_BLOCK_BASE|0x3C)
  #define VPOS        (LCD_CONTROL_BLOCK_BASE|0xC0)
  #define MPLFBUF     (LCD_CONTROL_BLOCK_BASE|0x20)
  #define WAKEUP      (LCD_CONTROL_BLOCK_BASE|0x54)
  #define WSYN_DLY    (LCD_CONTROL_BLOCK_BASE|0x58)
  #define REGENB      (LCD_CONTROL_BLOCK_BASE|0x5C)
  
  #define BASE5 0x150000
  #define BASE6 0x160000
  #define BASE7 0x170000
  
  #define GPIOIEV     (BASE5 + 0x10)
  #define GPIOIE      (BASE5 + 0x14)
  #define GPIORIS     (BASE5 + 0x18)
  #define GPIOMIS     (BASE5 + 0x1C)
  #define GPIOIC      (BASE5 + 0x20)
  
  #define INTMASK     (BASE6 + 0x0C)
  #define INTMASK_VWAKEOUT (1U << 0)
  #define INTMASK_VWAKEOUT_ACTIVE_LOW (1U << 8)
  #define GPIOSEL     (BASE7 + 0x00)
  #define GPIOSEL_VWAKEINT (1U << 0)
  
  static DECLARE_WAIT_QUEUE_HEAD(toshiba_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 *toshiba_callback;
  	int toshiba_got_int;
  };
  
  
  static void toshiba_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->toshiba_callback = callback;
  	if (panel->toshiba_got_int) {
  		panel->toshiba_got_int = 0;
  		client_data->activate_link(client_data);
  	}
  }
  
  static void toshiba_clear_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;
  
  	client_data->activate_link(client_data);
  }
  
  static void toshiba_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->toshiba_got_int) {
  		panel->toshiba_got_int = 0;
  		client_data->activate_link(client_data); /* clears interrupt */
  	}
  	if (wait_event_timeout(toshiba_vsync_wait, panel->toshiba_got_int,
  				HZ/2) == 0)
  		printk(KERN_ERR "timeout waiting for VSYNC\n");
  	panel->toshiba_got_int = 0;
  	/* interrupt clears when screen dma starts */
  }
  
  static int toshiba_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 toshiba client: non zero return from "
  			"uninit\n");
  		return ret;
  	}
  	client_data->suspend(client_data);
  	return 0;
  }
  
  static int toshiba_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 toshiba_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 toshiba_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 toshiba_vsync_interrupt(int irq, void *data)
  {
  	struct panel_info *panel = data;
  
  	panel->toshiba_got_int = 1;
  	if (panel->toshiba_callback) {
  		panel->toshiba_callback->func(panel->toshiba_callback);
  		panel->toshiba_callback = 0;
  	}
  	wake_up(&toshiba_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_one(gpio, GPIOF_IN, "vsync");
  	if (ret)
  		goto err_request_gpio_failed;
  
  	ret = irq = gpio_to_irq(gpio);
  	if (ret < 0)
  		goto err_get_irq_num_failed;
  
  	ret = request_irq(irq, toshiba_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);
  err_request_irq_failed:
  err_get_irq_num_failed:
  	gpio_free(gpio);
  err_request_gpio_failed:
  	return ret;
  }
  
  static int mddi_toshiba_probe(struct platform_device *pdev)
  {
  	int ret;
  	struct msm_mddi_client_data *client_data = pdev->dev.platform_data;
  	struct msm_mddi_bridge_platform_data *bridge_data =
  		client_data->private_client_data;
  	struct panel_info *panel =
  		kzalloc(sizeof(struct panel_info), GFP_KERNEL);
  	if (!panel)
  		return -ENOMEM;
  	platform_set_drvdata(pdev, panel);
  
  	/* mddi_remote_write(mddi, 0, WAKEUP); */
  	client_data->remote_write(client_data, GPIOSEL_VWAKEINT, GPIOSEL);
  	client_data->remote_write(client_data, INTMASK_VWAKEOUT, INTMASK);
  
  	ret = setup_vsync(panel, 1);
  	if (ret) {
  		dev_err(&pdev->dev, "mddi_bridge_setup_vsync failed\n");
  		return ret;
  	}
  
  	panel->client_data = client_data;
  	panel->panel_data.suspend = toshiba_suspend;
  	panel->panel_data.resume = toshiba_resume;
  	panel->panel_data.wait_vsync = toshiba_wait_vsync;
  	panel->panel_data.request_vsync = toshiba_request_vsync;
  	panel->panel_data.clear_vsync = toshiba_clear_vsync;
  	panel->panel_data.blank = toshiba_blank;
  	panel->panel_data.unblank = toshiba_unblank;
  	panel->panel_data.fb_data =  &bridge_data->fb_data;
  	panel->panel_data.caps = MSMFB_CAP_PARTIAL_UPDATES;
  
  	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;
  	bridge_data->init(bridge_data, client_data);
  	platform_device_register(&panel->pdev);
  
  	return 0;
  }
  
  static int mddi_toshiba_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_d263_0000 = {
  	.probe = mddi_toshiba_probe,
  	.remove = mddi_toshiba_remove,
  	.driver = { .name = "mddi_c_d263_0000" },
  };
  
  static int __init mddi_client_toshiba_init(void)
  {
  	platform_driver_register(&mddi_client_d263_0000);
  	return 0;
  }
  
  module_init(mddi_client_toshiba_init);
  
  