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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 | { |
34 | loff_t pos = *offset; |
35 | ssize_t count; |
36 | |
37 | if (pos >= radio_log_size) |
38 | return 0; |
39 | |
40 | count = min(len, (size_t)(radio_log_size - pos)); |
41 | if (copy_to_user(buf, radio_log_base + pos, count)) { |
42 | pr_err("%s: copy to user failed\n", __func__); |
43 | return -EFAULT; |
44 | } |
45 | |
46 | *offset += count; |
47 | return count; |
48 | } |
49 | |
50 | static struct file_operations last_radio_log_fops = { |
51 | .read = last_radio_log_read, |
52 | .llseek = default_llseek, |
53 | }; |
54 | |
55 | void msm_init_last_radio_log(struct module *owner) |
56 | { |
57 | struct proc_dir_entry *entry; |
58 | |
59 | if (last_radio_log_fops.owner) { |
60 | pr_err("%s: already claimed\n", __func__); |
61 | return; |
62 | } |
63 | |
64 | radio_log_base = smem_item(SMEM_CLKREGIM_BSP, &radio_log_size); |
65 | if (!radio_log_base) { |
66 | pr_err("%s: could not retrieve SMEM_CLKREGIM_BSP\n", __func__); |
67 | return; |
68 | } |
69 | |
70 | entry = create_proc_entry("last_radio_log", S_IFREG | S_IRUGO, NULL); |
71 | if (!entry) { |
72 | pr_err("%s: could not create proc entry for radio log\n", |
73 | __func__); |
74 | return; |
75 | } |
76 | |
77 | pr_err("%s: last radio log is %d bytes long\n", __func__, |
78 | radio_log_size); |
79 | last_radio_log_fops.owner = owner; |
80 | entry->proc_fops = &last_radio_log_fops; |
81 | entry->size = radio_log_size; |
82 | } |
83 | EXPORT_SYMBOL(msm_init_last_radio_log); |
84 |
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