fbdev: framebuffer support for HTC Dream

Add a framebuffer driver for Qualcomm MSM/QSD SoCs, tested on HTC Dream
smartphone (aka T-Mobile G1, aka ADP1).

Brian said:

  I did the original quick and dirty version for bringup.  Rebecca took
  over and (re)wrote the bulk of the driver, getting things stable for
  production ship of Dream and Sapphire, and Dima is currently adding
  support for later Qualcomm chipsets (QSD8x50, etc).

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Cc: Brian Swetland <swetland@google.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Rebecca Schultz Zavin <rebecca@android.com>
Cc: Dima Zavin <dima@android.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 255 insertions, 0 deletions

diff --git a/drivers/video/msm/mddi_client_nt35399.c b/drivers/video/msm/mddi_client_nt35399.c
new file mode 100644
index 000000000000..9c78050ac799
--- /dev/null
+++ b/drivers/video/msm/mddi_client_nt35399.c
@@ -0,0 +1,255 @@
+/* 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/gpio.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);
+