--- /dev/null
+/* arch/arm/mach-tegra/board-stingray-wlan_nvs.c
+ *
+ * Code to extract WiFi calibration information from ATAG set up
+ * by the bootloader.
+ *
+ * Copyright (C) 2008 Google, Inc.
+ * Author: Dmitry Shmidt <dimitrysh@google.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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/proc_fs.h>
+
+#include <asm/setup.h>
+
+/* configuration tags specific to msm */
+#define ATAG_WLAN_NVS 0x57494649 /* Wlan ATAG */
+
+#define NVS_MAX_SIZE 0x800U
+#define NVS_LEN_OFFSET 0x0C
+/* #define NVS_DATA_OFFSET 0x40*/
+#define NVS_DATA_OFFSET 0x0
+
+static unsigned char wifi_nvs_ram[NVS_MAX_SIZE];
+static unsigned wifi_nvs_size = 0;
+static struct proc_dir_entry *wifi_calibration;
+
+unsigned char *get_wifi_nvs_ram( void )
+{
+ return wifi_nvs_ram;
+}
+EXPORT_SYMBOL(get_wifi_nvs_ram);
+
+static int __init parse_tag_wlan_nvs(const struct tag *tag)
+{
+ unsigned char *dptr = (unsigned char *)(&tag->u);
+ unsigned size;
+#ifdef ATAG_WLAN_NVS_DEBUG
+ unsigned i;
+#endif
+
+ size = min((tag->hdr.size - 2) * sizeof(__u32), NVS_MAX_SIZE);
+#ifdef ATAG_WLAN_NVS_DEBUG
+ printk("WiFi Data size = %d , 0x%x\n", tag->hdr.size, tag->hdr.tag);
+ for(i=0;( i < size );i++) {
+ printk("%02x ", *dptr++);
+ }
+#endif
+ memcpy(wifi_nvs_ram, dptr, size);
+ wifi_nvs_size = size;
+ return 0;
+}
+
+__tagtable(ATAG_WLAN_NVS, parse_tag_wlan_nvs);
+
+static unsigned wifi_get_nvs_size( void )
+{
+#if 0
+ unsigned char *ptr;
+ unsigned len;
+
+ ptr = get_wifi_nvs_ram();
+ /* Size in format LE assumed */
+ memcpy(&len, ptr + NVS_LEN_OFFSET, sizeof(len));
+ len = min(len, (NVS_MAX_SIZE - NVS_DATA_OFFSET));
+ return len;
+#endif
+ return wifi_nvs_size;
+}
+
+int wifi_calibration_size_set(void)
+{
+ if (wifi_calibration != NULL)
+ wifi_calibration->size = wifi_get_nvs_size();
+ return 0;
+}
+
+static int wifi_calibration_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ unsigned char *ptr;
+ unsigned len;
+
+ ptr = get_wifi_nvs_ram();
+ len = min(wifi_get_nvs_size(), (unsigned)count);
+ memcpy(page, ptr + NVS_DATA_OFFSET, len);
+ return len;
+}
+
+static int __init wifi_nvs_init(void)
+{
+ wifi_calibration = create_proc_entry("calibration", 0444, NULL);
+ if (wifi_calibration != NULL) {
+ wifi_calibration->size = wifi_get_nvs_size();
+ wifi_calibration->read_proc = wifi_calibration_read_proc;
+ wifi_calibration->write_proc = NULL;
+ }
+ return 0;
+}
+
+device_initcall(wifi_nvs_init);