/* arch/arm/mach-msm/last_radio_log.c * * Extract the log from a modem crash though SMEM * * Copyright (C) 2007 Google, Inc. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/fs.h> #include <linux/proc_fs.h> #include <linux/uaccess.h> #include "smd_private.h" static void *radio_log_base; static size_t radio_log_size; extern void *smem_item(unsigned id, unsigned *size); static ssize_t last_radio_log_read(struct file *file, char __user *buf, size_t len, loff_t *offset) { loff_t pos = *offset; ssize_t count; if (pos >= radio_log_size) return 0; count = min(len, (size_t)(radio_log_size - pos)); if (copy_to_user(buf, radio_log_base + pos, count)) { pr_err("%s: copy to user failed\n", __func__); return -EFAULT; } *offset += count; return count; } static struct file_operations last_radio_log_fops = { .read = last_radio_log_read, .llseek = default_llseek, }; void msm_init_last_radio_log(struct module *owner) { struct proc_dir_entry *entry; if (last_radio_log_fops.owner) { pr_err("%s: already claimed\n", __func__); return; } radio_log_base = smem_item(SMEM_CLKREGIM_BSP, &radio_log_size); if (!radio_log_base) { pr_err("%s: could not retrieve SMEM_CLKREGIM_BSP\n", __func__); return; } entry = create_proc_entry("last_radio_log", S_IFREG | S_IRUGO, NULL); if (!entry) { pr_err("%s: could not create proc entry for radio log\n", __func__); return; } pr_err("%s: last radio log is %d bytes long\n", __func__, radio_log_size); last_radio_log_fops.owner = owner; entry->proc_fops = &last_radio_log_fops; entry->size = radio_log_size; } EXPORT_SYMBOL(msm_init_last_radio_log);