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/*
* Copyright (C) 2013 Spreadtrum Communications 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/module.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/sipc.h>
#include <linux/earlysuspend.h>
#define MAX_DDR_FREQ 640
#define MIN_DDR_FREQ 192
#define DDR_FREQ_BUF_LEN 4
static DEFINE_SPINLOCK(dfs_request_lock);
static unsigned int freq = 0;
int dfs_request(unsigned int freq)
{
int err = 0;
struct smsg msg;
smsg_set(&msg, SMSG_CH_PM_CTRL, SMSG_TYPE_DFS, 0, freq);
err = smsg_send(SIPC_ID_PM_SYS, &msg, 10);
if (err < 0) {
printk(KERN_ERR "%s, send freq(%d) failed\n",__func__,freq);
return err;
} else {
// Wait for the response
while (true) {
err = smsg_recv(SIPC_ID_PM_SYS, &msg, 100);
if (err < 0) {
printk(KERN_ERR "%s, send freq(%d) failed\n",__func__,freq);
return err;
}
if (SMSG_CH_PM_CTRL == msg.channel &&
SMSG_TYPE_DFS_RSP == msg.type) {
break;
}
}
if (msg.flag) {
// Non zero flag indicates DFS not supported
printk(KERN_WARNING "%s, DFS not supported\n",__func__);
return -EINVAL;
} else {
// Zero flag indicates DFS supported
if (msg.value) {
// DFS failed
printk(KERN_ERR "%s, dfs(%d) failed\n",__func__,freq);
return -EBUSY;
} else {
// DFS succeeded
printk("%s, dfs(%d) succeeded!\n",__func__,freq);
return 0;
}
}
}
}
static void scenario_dfs_early_suspend(struct early_suspend *h)
{
spin_lock(&dfs_request_lock);
freq = MIN_DDR_FREQ;
spin_unlock(&dfs_request_lock);
dfs_request(freq);
}
static void scenoario_dfs_late_resume(struct early_suspend *h)
{
spin_lock(&dfs_request_lock);
freq = MAX_DDR_FREQ;
spin_unlock(&dfs_request_lock);
dfs_request(freq);
}
static struct early_suspend scenario_dfs_early_suspend_desc = {
.level = EARLY_SUSPEND_LEVEL_DISABLE_FB + 100,
.suspend = scenario_dfs_early_suspend,
};
static struct early_suspend scenoario_dfs_late_resume_desc = {
.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN,
.resume = scenoario_dfs_late_resume,
};
static int scenario_dfs_open(struct inode *inode, struct file *file)
{
return 0;
}
static int scenario_dfs_release(struct inode *inode, struct file *filp)
{
return 0;
}
ssize_t scenario_dfs_write(struct file *file, const char __user *buf,
size_t count, loff_t *offset)
{
unsigned char freq_buf[DDR_FREQ_BUF_LEN] = { 0 };
if(count > DDR_FREQ_BUF_LEN){
printk(KERN_ERR "%s, invalid freq parameter\n",__func__);
return -EINVAL;
}
copy_from_user(freq_buf,buf,count);
spin_lock(&dfs_request_lock);
freq = (freq_buf[0]-'0')*100 + (freq_buf[1]-'0')*10 + (freq_buf[2]-'0');
spin_unlock(&dfs_request_lock);
if((freq > MAX_DDR_FREQ) || (freq < MIN_DDR_FREQ)){
printk(KERN_ERR "%s, invalid freq value\n",__func__);
return -EINVAL;
}
dfs_request(freq);
return count;
}
static const struct file_operations scenario_dfs_fops = {
.open = scenario_dfs_open,
.write = scenario_dfs_write,
.release = scenario_dfs_release,
.owner = THIS_MODULE,
};
static struct miscdevice scenario_dfs_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "sprd_scenario_dfs",
.fops = &scenario_dfs_fops
};
static int __init scenario_dfs_init(void)
{
int err;
err = smsg_ch_open(SIPC_ID_PM_SYS, SMSG_CH_PM_CTRL, -1);
if(err < 0){
printk(KERN_ERR "%s, open sipc channel failed\n",__func__);
return err;
}
register_early_suspend(&scenario_dfs_early_suspend_desc);
register_early_suspend(&scenoario_dfs_late_resume_desc);
return misc_register(&scenario_dfs_dev);
}
late_initcall(scenario_dfs_init);
static void __exit scenario_dfs_exit(void)
{
unregister_early_suspend(&scenario_dfs_early_suspend_desc);
unregister_early_suspend(&scenoario_dfs_late_resume_desc);
misc_deregister(&scenario_dfs_dev);
}
module_exit(scenario_dfs_exit);
MODULE_LICENSE("GPL");
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