From 8be90b07ac2a07b4f1eb685caa97e88b9f85ef27 Mon Sep 17 00:00:00 2001
From: Manuel Lauss <manuel.lauss@googlemail.com>
Date: Fri, 10 Jun 2011 15:23:03 +0000
Subject: [PATCH] au1200fb: make number of windows configurable at load time.

Make the number of framebuffer windows and the window configuration
selectable at the kernel commandline instead of hardcoding it
in the kernel config.

Signed-off-by: Manuel Lauss <manuel.lauss@googlemail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
---
 drivers/video/au1200fb.c | 53 +++++++++++++++++++++++++++++++++++-------------
 1 file changed, 39 insertions(+), 14 deletions(-)

diff --git a/drivers/video/au1200fb.c b/drivers/video/au1200fb.c
index 480ecb1..4b58f7b 100644
--- a/drivers/video/au1200fb.c
+++ b/drivers/video/au1200fb.c
@@ -46,10 +46,6 @@
 #include <asm/mach-au1x00/au1000.h>
 #include "au1200fb.h"
 
-#ifndef CONFIG_FB_AU1200_DEVS
-#define CONFIG_FB_AU1200_DEVS 4
-#endif
-
 #define DRIVER_NAME "au1200fb"
 #define DRIVER_DESC "LCD controller driver for AU1200 processors"
 
@@ -154,7 +150,6 @@ struct au1200fb_device {
 	dma_addr_t    		fb_phys;
 };
 
-static struct fb_info *_au1200fb_infos[CONFIG_FB_AU1200_DEVS];
 /********************************************************************/
 
 /* LCD controller restrictions */
@@ -167,10 +162,18 @@ static struct fb_info *_au1200fb_infos[CONFIG_FB_AU1200_DEVS];
 /* Default number of visible screen buffer to allocate */
 #define AU1200FB_NBR_VIDEO_BUFFERS 1
 
+/* Default maximum number of fb devices to create */
+#define MAX_DEVICE_COUNT	4
+
+/* Default window configuration entry to use (see windows[]) */
+#define DEFAULT_WINDOW_INDEX	2
+
 /********************************************************************/
 
+static struct fb_info *_au1200fb_infos[MAX_DEVICE_COUNT];
 static struct au1200_lcd *lcd = (struct au1200_lcd *) AU1200_LCD_ADDR;
-static int window_index = 2; /* default is zero */
+static int device_count = MAX_DEVICE_COUNT;
+static int window_index = DEFAULT_WINDOW_INDEX;	/* default is zero */
 static int panel_index = 2; /* default is zero */
 static struct window_settings *win;
 static struct panel_settings *panel;
@@ -683,7 +686,7 @@ static int fbinfo2index (struct fb_info *fb_info)
 {
 	int i;
 
-	for (i = 0; i < CONFIG_FB_AU1200_DEVS; ++i) {
+	for (i = 0; i < device_count; ++i) {
 		if (fb_info == _au1200fb_infos[i])
 			return i;
 	}
@@ -1599,7 +1602,7 @@ static int __devinit au1200fb_drv_probe(struct platform_device *dev)
 	/* Kickstart the panel */
 	au1200_setpanel(panel);
 
-	for (plane = 0; plane < CONFIG_FB_AU1200_DEVS; ++plane) {
+	for (plane = 0; plane < device_count; ++plane) {
 		bpp = winbpp(win->w[plane].mode_winctrl1);
 		if (win->w[plane].xres == 0)
 			win->w[plane].xres = panel->Xres;
@@ -1699,7 +1702,7 @@ static int __devexit au1200fb_drv_remove(struct platform_device *dev)
 	/* Turn off the panel */
 	au1200_setpanel(NULL);
 
-	for (plane = 0; plane < CONFIG_FB_AU1200_DEVS; ++plane)	{
+	for (plane = 0; plane < device_count; ++plane)	{
 		fbi = _au1200fb_infos[plane];
 		fbdev = fbi->par;
 
@@ -1741,7 +1744,7 @@ static int au1200fb_drv_resume(struct device *dev)
 	/* Kickstart the panel */
 	au1200_setpanel(panel);
 
-	for (i = 0; i < CONFIG_FB_AU1200_DEVS; i++) {
+	for (i = 0; i < device_count; i++) {
 		fbi = _au1200fb_infos[i];
 		au1200fb_fb_set_par(fbi);
 	}
@@ -1776,10 +1779,10 @@ static struct platform_driver au1200fb_driver = {
 
 /* Kernel driver */
 
-static void au1200fb_setup(void)
+static int au1200fb_setup(void)
 {
-	char* options = NULL;
-	char* this_opt;
+	char *options = NULL;
+	char *this_opt, *endptr;
 	int num_panels = ARRAY_SIZE(known_lcd_panels);
 	int panel_idx = -1;
 
@@ -1824,12 +1827,33 @@ static void au1200fb_setup(void)
 				nohwcursor = 1;
 			}
 
+			else if (strncmp(this_opt, "devices:", 8) == 0) {
+				this_opt += 8;
+				device_count = simple_strtol(this_opt,
+							     &endptr, 0);
+				if ((device_count < 0) ||
+				    (device_count > MAX_DEVICE_COUNT))
+					device_count = MAX_DEVICE_COUNT;
+			}
+
+			else if (strncmp(this_opt, "wincfg:", 7) == 0) {
+				this_opt += 7;
+				window_index = simple_strtol(this_opt,
+							     &endptr, 0);
+				if ((window_index < 0) ||
+				    (window_index >= ARRAY_SIZE(windows)))
+					window_index = DEFAULT_WINDOW_INDEX;
+			}
+
+			else if (strncmp(this_opt, "off", 3) == 0)
+				return 1;
 			/* Unsupported option */
 			else {
 				print_warn("Unsupported option \"%s\"", this_opt);
 			}
 		}
 	}
+	return 0;
 }
 
 static int __init au1200fb_init(void)
@@ -1837,7 +1861,8 @@ static int __init au1200fb_init(void)
 	print_info("" DRIVER_DESC "");
 
 	/* Setup driver with options */
-	au1200fb_setup();
+	if (au1200fb_setup())
+		return -ENODEV;
 
 	/* Point to the panel selected */
 	panel = &known_lcd_panels[panel_index];
-- 
2.7.4