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1207babd IM |
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 | ||
31 | static ssize_t last_radio_log_read(struct file *file, char __user *buf, | |
32 | size_t len, loff_t *offset) | |
33 | { | |
8510e30b AV |
34 | return simple_read_from_buffer(buf, len, offset, |
35 | radio_log_base, radio_log_size); | |
1207babd IM |
36 | } |
37 | ||
38 | static struct file_operations last_radio_log_fops = { | |
6038f373 AB |
39 | .read = last_radio_log_read, |
40 | .llseek = default_llseek, | |
1207babd IM |
41 | }; |
42 | ||
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 | ||
8510e30b AV |
58 | entry = proc_create("last_radio_log", S_IRUGO, NULL, |
59 | &last_radio_log_fops); | |
1207babd IM |
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; | |
254844d3 | 69 | proc_set_size(entry, radio_log_size); |
1207babd IM |
70 | } |
71 | EXPORT_SYMBOL(msm_init_last_radio_log); |