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/* arch/arm/mach-msm/htc_akm_cal.c
*
* Code to extract compass calibration information from ATAG set up
* by the bootloader.
*
* Copyright (C) 2007-2008 HTC Corporation
* Author: Farmer Tseng <farmer_tseng@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/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <asm/setup.h>
/* configuration tags specific to AKM8976 */
#define ATAG_AKM8976 0x89768976 /* AKM8976 */
#define MAX_CALI_SIZE 0x1000U
static char akm_cal_ram[MAX_CALI_SIZE];
char *get_akm_cal_ram(void)
{
return(akm_cal_ram);
}
EXPORT_SYMBOL(get_akm_cal_ram);
static int __init parse_tag_akm(const struct tag *tag)
{
unsigned char *dptr = (unsigned char *)(&tag->u);
unsigned size;
size = min((tag->hdr.size - 2) * sizeof(__u32), MAX_CALI_SIZE);
printk(KERN_INFO "AKM Data size = %d , 0x%x, size = %d\n",
tag->hdr.size, tag->hdr.tag, size);
#ifdef ATAG_COMPASS_DEBUG
unsigned i;
unsigned char *ptr;
ptr = dptr;
printk(KERN_INFO
"AKM Data size = %d , 0x%x\n",
tag->hdr.size, tag->hdr.tag);
for (i = 0; i < size; i++)
printk(KERN_INFO "%02x ", *ptr++);
#endif
memcpy((void *)akm_cal_ram, (void *)dptr, size);
return 0;
}
__tagtable(ATAG_AKM8976, parse_tag_akm);
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