mirror of https://gitee.com/openkylin/linux.git
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/* arch/arm/mach-msm/last_radio_log.c
|
|
*
|
|
* Extract the log from a modem crash though SMEM
|
|
*
|
|
* Copyright (C) 2007 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "smd_private.h"
|
|
|
|
static void *radio_log_base;
|
|
static size_t radio_log_size;
|
|
|
|
extern void *smem_item(unsigned id, unsigned *size);
|
|
|
|
static ssize_t last_radio_log_read(struct file *file, char __user *buf,
|
|
size_t len, loff_t *offset)
|
|
{
|
|
loff_t pos = *offset;
|
|
ssize_t count;
|
|
|
|
if (pos >= radio_log_size)
|
|
return 0;
|
|
|
|
count = min(len, (size_t)(radio_log_size - pos));
|
|
if (copy_to_user(buf, radio_log_base + pos, count)) {
|
|
pr_err("%s: copy to user failed\n", __func__);
|
|
return -EFAULT;
|
|
}
|
|
|
|
*offset += count;
|
|
return count;
|
|
}
|
|
|
|
static struct file_operations last_radio_log_fops = {
|
|
.read = last_radio_log_read,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
void msm_init_last_radio_log(struct module *owner)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
if (last_radio_log_fops.owner) {
|
|
pr_err("%s: already claimed\n", __func__);
|
|
return;
|
|
}
|
|
|
|
radio_log_base = smem_item(SMEM_CLKREGIM_BSP, &radio_log_size);
|
|
if (!radio_log_base) {
|
|
pr_err("%s: could not retrieve SMEM_CLKREGIM_BSP\n", __func__);
|
|
return;
|
|
}
|
|
|
|
entry = create_proc_entry("last_radio_log", S_IFREG | S_IRUGO, NULL);
|
|
if (!entry) {
|
|
pr_err("%s: could not create proc entry for radio log\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
pr_err("%s: last radio log is %d bytes long\n", __func__,
|
|
radio_log_size);
|
|
last_radio_log_fops.owner = owner;
|
|
entry->proc_fops = &last_radio_log_fops;
|
|
entry->size = radio_log_size;
|
|
}
|
|
EXPORT_SYMBOL(msm_init_last_radio_log);
|