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/* 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);
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