drivers/video/msm/mddi_client_nt35399.c

   1 /* drivers/video/msm_fb/mddi_client_nt35399.c
   2  *
   3  * Support for Novatek NT35399 MDDI client of Sapphire
   4  *
   5  * Copyright (C) 2008 HTC Incorporated
   6  * Author: Solomon Chiu (solomon_chiu@htc.com)
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/sched.h>
  23 #include <linux/gpio.h>
  24 #include <linux/slab.h>
  25 #include <linux/platform_data/video-msm_fb.h>
  26
  27 static DECLARE_WAIT_QUEUE_HEAD(nt35399_vsync_wait);
  28
  29 struct panel_info {
  30         struct msm_mddi_client_data *client_data;
  31         struct platform_device pdev;
  32         struct msm_panel_data panel_data;
  33         struct msmfb_callback *fb_callback;
  34         struct work_struct panel_work;
  35         struct workqueue_struct *fb_wq;
  36         int nt35399_got_int;
  37 };
  38
  39 static void
  40 nt35399_request_vsync(struct msm_panel_data *panel_data,
  41                       struct msmfb_callback *callback)
  42 {
  43         struct panel_info *panel = container_of(panel_data, struct panel_info,
  44                                                 panel_data);
  45         struct msm_mddi_client_data *client_data = panel->client_data;
  46
  47         panel->fb_callback = callback;
  48         if (panel->nt35399_got_int) {
  49                 panel->nt35399_got_int = 0;
  50                 client_data->activate_link(client_data); /* clears interrupt */
  51         }
  52 }
  53
  54 static void nt35399_wait_vsync(struct msm_panel_data *panel_data)
  55 {
  56         struct panel_info *panel = container_of(panel_data, struct panel_info,
  57                                                 panel_data);
  58         struct msm_mddi_client_data *client_data = panel->client_data;
  59
  60         if (panel->nt35399_got_int) {
  61                 panel->nt35399_got_int = 0;
  62                 client_data->activate_link(client_data); /* clears interrupt */
  63         }
  64
  65         if (wait_event_timeout(nt35399_vsync_wait, panel->nt35399_got_int,
  66                                 HZ/2) == 0)
  67                 printk(KERN_ERR "timeout waiting for VSYNC\n");
  68
  69         panel->nt35399_got_int = 0;
  70         /* interrupt clears when screen dma starts */
  71 }
  72
  73 static int nt35399_suspend(struct msm_panel_data *panel_data)
  74 {
  75         struct panel_info *panel = container_of(panel_data, struct panel_info,
  76                                                 panel_data);
  77         struct msm_mddi_client_data *client_data = panel->client_data;
  78
  79         struct msm_mddi_bridge_platform_data *bridge_data =
  80                 client_data->private_client_data;
  81         int ret;
  82
  83         ret = bridge_data->uninit(bridge_data, client_data);
  84         if (ret) {
  85                 printk(KERN_INFO "mddi nt35399 client: non zero return from "
  86                         "uninit\n");
  87                 return ret;
  88         }
  89         client_data->suspend(client_data);
  90         return 0;
  91 }
  92
  93 static int nt35399_resume(struct msm_panel_data *panel_data)
  94 {
  95         struct panel_info *panel = container_of(panel_data, struct panel_info,
  96                                                 panel_data);
  97         struct msm_mddi_client_data *client_data = panel->client_data;
  98
  99         struct msm_mddi_bridge_platform_data *bridge_data =
 100                 client_data->private_client_data;
 101         int ret;
 102
 103         client_data->resume(client_data);
 104         ret = bridge_data->init(bridge_data, client_data);
 105         if (ret)
 106                 return ret;
 107         return 0;
 108 }
 109
 110 static int nt35399_blank(struct msm_panel_data *panel_data)
 111 {
 112         struct panel_info *panel = container_of(panel_data, struct panel_info,
 113                                                 panel_data);
 114         struct msm_mddi_client_data *client_data = panel->client_data;
 115         struct msm_mddi_bridge_platform_data *bridge_data =
 116                 client_data->private_client_data;
 117
 118         return bridge_data->blank(bridge_data, client_data);
 119 }
 120
 121 static int nt35399_unblank(struct msm_panel_data *panel_data)
 122 {
 123         struct panel_info *panel = container_of(panel_data, struct panel_info,
 124                                                 panel_data);
 125         struct msm_mddi_client_data *client_data = panel->client_data;
 126         struct msm_mddi_bridge_platform_data *bridge_data =
 127                 client_data->private_client_data;
 128
 129         return bridge_data->unblank(bridge_data, client_data);
 130 }
 131
 132 irqreturn_t nt35399_vsync_interrupt(int irq, void *data)
 133 {
 134         struct panel_info *panel = data;
 135
 136         panel->nt35399_got_int = 1;
 137
 138         if (panel->fb_callback) {
 139                 panel->fb_callback->func(panel->fb_callback);
 140                 panel->fb_callback = NULL;
 141         }
 142
 143         wake_up(&nt35399_vsync_wait);
 144
 145         return IRQ_HANDLED;
 146 }
 147
 148 static int setup_vsync(struct panel_info *panel, int init)
 149 {
 150         int ret;
 151         int gpio = 97;
 152         unsigned int irq;
 153
 154         if (!init) {
 155                 ret = 0;
 156                 goto uninit;
 157         }
 158         ret = gpio_request_one(gpio, GPIOF_IN, "vsync");
 159         if (ret)
 160                 goto err_request_gpio_failed;
 161
 162         ret = irq = gpio_to_irq(gpio);
 163         if (ret < 0)
 164                 goto err_get_irq_num_failed;
 165
 166         ret = request_irq(irq, nt35399_vsync_interrupt, IRQF_TRIGGER_RISING,
 167                           "vsync", panel);
 168         if (ret)
 169                 goto err_request_irq_failed;
 170
 171         printk(KERN_INFO "vsync on gpio %d now %d\n",
 172                gpio, gpio_get_value(gpio));
 173         return 0;
 174
 175 uninit:
 176         free_irq(gpio_to_irq(gpio), panel->client_data);
 177 err_request_irq_failed:
 178 err_get_irq_num_failed:
 179         gpio_free(gpio);
 180 err_request_gpio_failed:
 181         return ret;
 182 }
 183
 184 static int mddi_nt35399_probe(struct platform_device *pdev)
 185 {
 186         struct msm_mddi_client_data *client_data = pdev->dev.platform_data;
 187         struct msm_mddi_bridge_platform_data *bridge_data =
 188                 client_data->private_client_data;
 189
 190         int ret;
 191
 192         struct panel_info *panel = devm_kzalloc(&pdev->dev,
 193                                                 sizeof(struct panel_info),
 194                                                 GFP_KERNEL);
 195
 196         printk(KERN_DEBUG "%s: enter.\n", __func__);
 197
 198         if (!panel)
 199                 return -ENOMEM;
 200         platform_set_drvdata(pdev, panel);
 201
 202         ret = setup_vsync(panel, 1);
 203         if (ret) {
 204                 dev_err(&pdev->dev, "mddi_nt35399_setup_vsync failed\n");
 205                 return ret;
 206         }
 207
 208         panel->client_data = client_data;
 209         panel->panel_data.suspend = nt35399_suspend;
 210         panel->panel_data.resume = nt35399_resume;
 211         panel->panel_data.wait_vsync = nt35399_wait_vsync;
 212         panel->panel_data.request_vsync = nt35399_request_vsync;
 213         panel->panel_data.blank = nt35399_blank;
 214         panel->panel_data.unblank = nt35399_unblank;
 215         panel->panel_data.fb_data = &bridge_data->fb_data;
 216         panel->panel_data.caps = 0;
 217
 218         panel->pdev.name = "msm_panel";
 219         panel->pdev.id = pdev->id;
 220         panel->pdev.resource = client_data->fb_resource;
 221         panel->pdev.num_resources = 1;
 222         panel->pdev.dev.platform_data = &panel->panel_data;
 223
 224         if (bridge_data->init)
 225                 bridge_data->init(bridge_data, client_data);
 226
 227         platform_device_register(&panel->pdev);
 228
 229         return 0;
 230 }
 231
 232 static int mddi_nt35399_remove(struct platform_device *pdev)
 233 {
 234         struct panel_info *panel = platform_get_drvdata(pdev);
 235
 236         setup_vsync(panel, 0);
 237         return 0;
 238 }
 239
 240 static struct platform_driver mddi_client_0bda_8a47 = {
 241         .probe = mddi_nt35399_probe,
 242         .remove = mddi_nt35399_remove,
 243         .driver = { .name = "mddi_c_0bda_8a47" },
 244 };
 245
 246 static int __init mddi_client_nt35399_init(void)
 247 {
 248         return platform_driver_register(&mddi_client_0bda_8a47);
 249 }
 250
 251 module_init(mddi_client_nt35399_init);
 252