127 lines
3.0 KiB
C
127 lines
3.0 KiB
C
/* arch/arm/mach-msm/htc_awb_cal.c */
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/* Code to extract Camera AWB calibration information from ATAG
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set up by the bootloader.
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Copyright (C) 2008 Google, Inc.
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Author: Dmitry Shmidt <dimitrysh@google.com>
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This software is licensed under the terms of the GNU General Public
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License version 2, as published by the Free Software Foundation, and
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may be copied, distributed, and modified under those terms.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/proc_fs.h>
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#include <asm/setup.h>
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/* for outputing file to filesystem : /data/awb_calibration_data_hboot.txt */
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#include <linux/fs.h>
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#include <linux/syscalls.h>
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/* configuration tags specific to msm */
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#define ATAG_MSM_AWB_CAL 0x59504550 /* MSM CAMERA AWB Calibration */
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#define AWB_CAL_MAX_SIZE 0x800U /* 0x800 = 2048 bytes */
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static unsigned char cam_awb_ram[AWB_CAL_MAX_SIZE];
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int gCAM_AWB_CAL_LEN;
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unsigned char *get_cam_awb_cal(void)
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{
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return cam_awb_ram;
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}
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EXPORT_SYMBOL(get_cam_awb_cal);
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static int __init parse_tag_cam_awb_cal(const struct tag *tag)
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{
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unsigned char *dptr = (unsigned char *)(&tag->u);
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unsigned size;
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size = min((tag->hdr.size - 2) * sizeof(__u32), AWB_CAL_MAX_SIZE);
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printk(KERN_INFO "CAM_AWB_CAL Data size = %d , 0x%x, size = %d\n",
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tag->hdr.size, tag->hdr.tag, size);
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gCAM_AWB_CAL_LEN = size;
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memcpy(cam_awb_ram, dptr, size);
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#ifdef ATAG_CAM_AWB_CAL_DEBUG
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{
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int *pint, i;
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printk(KERN_INFO "parse_tag_cam_awb_cal():\n");
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pint = (int *)cam_awb_ram;
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for (i = 0; i < 8; i++)
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printk(KERN_INFO "%x\n", pint[i]);
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}
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#endif
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return 0;
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}
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__tagtable(ATAG_MSM_AWB_CAL, parse_tag_cam_awb_cal);
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static ssize_t awb_calibration_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t ret = 0;
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unsigned char *ptr;
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ptr = get_cam_awb_cal();
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/* fixed : workaround because of defined 8 parameters now */
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ret = 8*4;
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memcpy(buf, ptr, ret);
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#ifdef ATAG_CAM_AWB_CAL_DEBUG
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{
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int i, *pint;
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printk(KERN_INFO "awb_calibration_show():\n");
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pint = (int *)ptr;
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for (i = 0; i < 8; i++)
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printk(KERN_INFO "%x\n", pint[i]);
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}
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#endif
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return ret;
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}
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static DEVICE_ATTR(awb_cal, 0444, awb_calibration_show, NULL);
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static struct kobject *cam_awb_cal;
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static int cam_get_awb_cal(void)
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{
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int ret ;
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/* Create /sys/android_camera_awb_cal/awb_cal */
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cam_awb_cal = kobject_create_and_add("android_camera_awb_cal", NULL);
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if (cam_awb_cal == NULL) {
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pr_info("cam_get_awb_cal: subsystem_register failed\n");
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ret = -ENOMEM;
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return ret ;
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}
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/* dev_attr_[register_name]<== DEVICE_ATTR(awb_cal, 0444,
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awb_calibration_show, NULL); */
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ret = sysfs_create_file(cam_awb_cal, &dev_attr_awb_cal.attr);
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if (ret) {
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pr_info("cam_get_awb_cal:: sysfs_create_file failed\n");
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kobject_del(cam_awb_cal);
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}
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return 0 ;
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}
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late_initcall(cam_get_awb_cal);
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