1 /* arch/arm/mach-msm/last_radio_log.c
2 *
3 * Extract the log from a modem crash though SMEM
4 *
5 * Copyright (C) 2007 Google, Inc.
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/fs.h>
21 #include <linux/proc_fs.h>
22 #include <linux/uaccess.h>
23
24 #include "smd_private.h"
25
26 static void *radio_log_base;
27 static size_t radio_log_size;
28
29 extern void *smem_item(unsigned id, unsigned *size);
30
last_radio_log_read(struct file * file,char __user * buf,size_t len,loff_t * offset)31 static ssize_t last_radio_log_read(struct file *file, char __user *buf,
32 size_t len, loff_t *offset)
33 {
34 return simple_read_from_buffer(buf, len, offset,
35 radio_log_base, radio_log_size);
36 }
37
38 static struct file_operations last_radio_log_fops = {
39 .read = last_radio_log_read,
40 .llseek = default_llseek,
41 };
42
msm_init_last_radio_log(struct module * owner)43 void msm_init_last_radio_log(struct module *owner)
44 {
45 struct proc_dir_entry *entry;
46
47 if (last_radio_log_fops.owner) {
48 pr_err("%s: already claimed\n", __func__);
49 return;
50 }
51
52 radio_log_base = smem_item(SMEM_CLKREGIM_BSP, &radio_log_size);
53 if (!radio_log_base) {
54 pr_err("%s: could not retrieve SMEM_CLKREGIM_BSP\n", __func__);
55 return;
56 }
57
58 entry = proc_create("last_radio_log", S_IRUGO, NULL,
59 &last_radio_log_fops);
60 if (!entry) {
61 pr_err("%s: could not create proc entry for radio log\n",
62 __func__);
63 return;
64 }
65
66 pr_err("%s: last radio log is %d bytes long\n", __func__,
67 radio_log_size);
68 last_radio_log_fops.owner = owner;
69 proc_set_size(entry, radio_log_size);
70 }
71 EXPORT_SYMBOL(msm_init_last_radio_log);
72