staging: android: ram_console: pass in a boot info string

Allow the board file to pass a boot info string through the
platform data that is appended to the /proc/last_kmsg file.

[moved the .h file to drivers/staging/android/ to be self-contained - gregkh]

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/android/ram_console.c

@@ -21,6 +21,7 @@
 #include <linux/string.h>
 #include <linux/uaccess.h>
 #include <linux/io.h>
+#include "ram_console.h"
 
 #ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
 #include <linux/rslib.h>
@@ -155,14 +156,20 @@ void ram_console_enable_console(int enabled)
 }
 
 static void __init
-ram_console_save_old(struct ram_console_buffer *buffer, char *dest)
+ram_console_save_old(struct ram_console_buffer *buffer, const char *bootinfo,
+	char *dest)
 {
 	size_t old_log_size = buffer->size;
+	size_t bootinfo_size = 0;
+	size_t total_size = old_log_size;
+	char *ptr;
+	const char *bootinfo_label = "Boot info:\n";
+
 #ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
 	uint8_t *block;
 	uint8_t *par;
 	char strbuf[80];
-	int strbuf_len;
+	int strbuf_len = 0;
 
 	block = buffer->data;
 	par = ram_console_par_buffer;
@@ -197,11 +204,15 @@ ram_console_save_old(struct ram_console_buffer *buffer, char *dest)
 				      "\nNo errors detected\n");
 	if (strbuf_len >= sizeof(strbuf))
 		strbuf_len = sizeof(strbuf) - 1;
-	old_log_size += strbuf_len;
+	total_size += strbuf_len;
 #endif
 
+	if (bootinfo)
+		bootinfo_size = strlen(bootinfo) + strlen(bootinfo_label);
+	total_size += bootinfo_size;
+
 	if (dest == NULL) {
-		dest = kmalloc(old_log_size, GFP_KERNEL);
+		dest = kmalloc(total_size, GFP_KERNEL);
 		if (dest == NULL) {
 			printk(KERN_ERR
 			       "ram_console: failed to allocate buffer\n");
@@ -210,19 +221,27 @@ ram_console_save_old(struct ram_console_buffer *buffer, char *dest)
 	}
 
 	ram_console_old_log = dest;
-	ram_console_old_log_size = old_log_size;
+	ram_console_old_log_size = total_size;
 	memcpy(ram_console_old_log,
 	       &buffer->data[buffer->start], buffer->size - buffer->start);
 	memcpy(ram_console_old_log + buffer->size - buffer->start,
 	       &buffer->data[0], buffer->start);
+	ptr = ram_console_old_log + old_log_size;
 #ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
-	memcpy(ram_console_old_log + old_log_size - strbuf_len,
-	       strbuf, strbuf_len);
+	memcpy(ptr, strbuf, strbuf_len);
+	ptr += strbuf_len;
 #endif
+	if (bootinfo) {
+		memcpy(ptr, bootinfo_label, strlen(bootinfo_label));
+		ptr += strlen(bootinfo_label);
+		memcpy(ptr, bootinfo, bootinfo_size);
+		ptr += bootinfo_size;
+	}
 }
 
 static int __init ram_console_init(struct ram_console_buffer *buffer,
-				   size_t buffer_size, char *old_buf)
+				   size_t buffer_size, const char *bootinfo,
+				   char *old_buf)
 {
 #ifdef CONFIG_ANDROID_RAM_CONSOLE_ERROR_CORRECTION
 	int numerr;
@@ -289,7 +308,7 @@ static int __init ram_console_init(struct ram_console_buffer *buffer,
 			printk(KERN_INFO "ram_console: found existing buffer, "
 			       "size %d, start %d\n",
 			       buffer->size, buffer->start);
-			ram_console_save_old(buffer, old_buf);
+			ram_console_save_old(buffer, bootinfo, old_buf);
 		}
 	} else {
 		printk(KERN_INFO "ram_console: no valid data in buffer "
@@ -313,6 +332,7 @@ static int __init ram_console_early_init(void)
 	return ram_console_init((struct ram_console_buffer *)
 		CONFIG_ANDROID_RAM_CONSOLE_EARLY_ADDR,
 		CONFIG_ANDROID_RAM_CONSOLE_EARLY_SIZE,
+		NULL,
 		ram_console_old_log_init_buffer);
 }
 #else
@@ -322,6 +342,8 @@ static int ram_console_driver_probe(struct platform_device *pdev)
 	size_t start;
 	size_t buffer_size;
 	void *buffer;
+	const char *bootinfo = NULL;
+	struct ram_console_platform_data *pdata = pdev->dev.platform_data;
 
 	if (res == NULL || pdev->num_resources != 1 ||
 	    !(res->flags & IORESOURCE_MEM)) {
@@ -339,7 +361,10 @@ static int ram_console_driver_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 
-	return ram_console_init(buffer, buffer_size, NULL/* allocate */);
+	if (pdata)
+		bootinfo = pdata->bootinfo;
+
+	return ram_console_init(buffer, buffer_size, bootinfo, NULL/* allocate */);
 }
 
 static struct platform_driver ram_console_driver = {

drivers/staging/android/ram_console.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2010 Google, Inc.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _INCLUDE_LINUX_PLATFORM_DATA_RAM_CONSOLE_H_
+#define _INCLUDE_LINUX_PLATFORM_DATA_RAM_CONSOLE_H_
+
+struct ram_console_platform_data {
+	const char *bootinfo;
+};
+
+#endif /* _INCLUDE_LINUX_PLATFORM_DATA_RAM_CONSOLE_H_ */