[deliverable/linux.git] / arch / arm / mach-msm / last_radio_log.c

/* 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);
Commit	Line	Data
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,
6038f373 AB	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);