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/* Copyright (c) 2008-2009, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
*/
/*
* MSM architecture driver to reset the modem
*/
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <mach/proc_comm.h>
#include "smd_private.h"
#define DEBUG
/* #undef DEBUG */
#ifdef DEBUG
#define D(x...) printk(x)
#else
#define D(x...) do {} while (0)
#endif
static ssize_t reset_modem_read(struct file *fp, char __user *buf,
size_t count, loff_t *pos)
{
return 0;
}
static ssize_t reset_modem_write(struct file *fp, const char __user *buf,
size_t count, loff_t *pos)
{
unsigned char cmd[64];
int len;
int time;
int zero = 0;
int r;
if (count < 1)
return 0;
len = count > 63 ? 63 : count;
if (copy_from_user(cmd, buf, len))
return -EFAULT;
cmd[len] = 0;
/* lazy */
if (cmd[len-1] == '\n') {
cmd[len-1] = 0;
len--;
}
if (!strncmp(cmd, "wait", 4)) {
D(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: WAIT\n",
__FILE__,
__LINE__,
__func__);
smsm_reset_modem(SMSM_MODEM_WAIT);
} else if (!strncmp(cmd, "continue", 8)) {
D(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: CONTINUE\n",
__FILE__,
__LINE__,
__func__);
smsm_reset_modem_cont();
} else if (!strncmp(cmd, "download", 8)) {
D(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: DOWNLOAD\n",
__FILE__,
__LINE__,
__func__);
smsm_reset_modem(SMSM_SYSTEM_DOWNLOAD);
} else if (sscanf(cmd, "deferred reset %i", &time) == 1) {
D(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: DEFERRED RESET %ims\n",
__FILE__,
__LINE__,
__func__,
time);
if (time == 0) {
r = 0;
msm_proc_comm_reset_modem_now();
} else {
r = msm_proc_comm(PCOM_RESET_MODEM, &time, &zero);
}
if (r < 0)
return r;
} else if (!strncmp(cmd, "deferred reset", 14)) {
D(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: DEFERRED RESET 0ms\n",
__FILE__,
__LINE__,
__func__);
r = 0;
msm_proc_comm_reset_modem_now();
if (r < 0)
return r;
} else if (!strncmp(cmd, "reset chip now", 14)) {
uint param1 = 0x0;
uint param2 = 0x0;
D(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: CHIP RESET IMMEDIATE\n",
__FILE__,
__LINE__,
__func__);
r = msm_proc_comm(PCOM_RESET_CHIP_IMM, ¶m1, ¶m2);
if (r < 0)
return r;
} else if (!strncmp(cmd, "reset chip", 10)) {
uint param1 = 0x0;
uint param2 = 0x0;
D(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: CHIP RESET \n",
__FILE__,
__LINE__,
__func__);
r = msm_proc_comm(PCOM_RESET_CHIP, ¶m1, ¶m2);
if (r < 0)
return r;
} else if (!strncmp(cmd, "reset", 5)) {
printk(KERN_ERR "INFO:%s:%i:%s: "
"MODEM RESTART: RESET\n",
__FILE__,
__LINE__,
__func__);
smsm_reset_modem(SMSM_RESET);
} else
return -EINVAL;
return count;
}
static int reset_modem_open(struct inode *ip, struct file *fp)
{
return 0;
}
static int reset_modem_release(struct inode *ip, struct file *fp)
{
return 0;
}
static const struct file_operations reset_modem_fops = {
.owner = THIS_MODULE,
.read = reset_modem_read,
.write = reset_modem_write,
.open = reset_modem_open,
.release = reset_modem_release,
};
static struct miscdevice reset_modem_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "reset_modem",
.fops = &reset_modem_fops,
};
static int __init reset_modem_init(void)
{
return misc_register(&reset_modem_dev);
}
module_init(reset_modem_init);
MODULE_DESCRIPTION("Reset Modem");
MODULE_LICENSE("GPL v2");
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