| /* arch/arm/mach-msm/htc_wifi_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_MSM_WIFI 0x57494649 /* MSM WiFi */ |
| |
| #define NVS_MAX_SIZE 0x800U |
| #define NVS_LEN_OFFSET 0x0C |
| #define NVS_DATA_OFFSET 0x40 |
| |
| static unsigned char wifi_nvs_ram[NVS_MAX_SIZE]; |
| 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_msm_wifi(const struct tag *tag) |
| { |
| unsigned char *dptr = (unsigned char *)(&tag->u); |
| unsigned size; |
| #ifdef ATAG_MSM_WIFI_DEBUG |
| unsigned i; |
| #endif |
| |
| size = min((tag->hdr.size - 2) * sizeof(__u32), NVS_MAX_SIZE); |
| #ifdef ATAG_MSM_WIFI_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); |
| return 0; |
| } |
| |
| __tagtable(ATAG_MSM_WIFI, parse_tag_msm_wifi); |
| |
| static unsigned wifi_get_nvs_size( void ) |
| { |
| 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; |
| } |
| |
| 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); |