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