mirror of https://gitee.com/openkylin/linux.git
72 lines
1.9 KiB
C
72 lines
1.9 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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return simple_read_from_buffer(buf, len, offset,
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radio_log_base, radio_log_size);
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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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.llseek = default_llseek,
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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 = proc_create("last_radio_log", S_IRUGO, NULL,
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&last_radio_log_fops);
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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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proc_set_size(entry, radio_log_size);
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}
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EXPORT_SYMBOL(msm_init_last_radio_log);
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