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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 | { | |
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 = { | |
6038f373 AB |
51 | .read = last_radio_log_read, |
52 | .llseek = default_llseek, | |
1207babd IM |
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); |