LXR linux/arch/arm/mach-msm/last_radio

   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
  26static void *radio_log_base;
  27static size_t radio_log_size;
  28
  29extern void *smem_item(unsigned id, unsigned *size);
  30
  31static 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
  38static struct file_operations last_radio_log_fops = {
  39        .read = last_radio_log_read,
  40        .llseek = default_llseek,
  41};
  42
  43void 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}
  71EXPORT_SYMBOL(msm_init_last_radio_log);
  72