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/*
* Copyright (C) ST-Ericsson SA 2011
*
* License terms: GNU General Public License (GPL) version 2
* Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST-Ericsson
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/clk.h>
#include "clock.h"
struct clk_debug_info {
struct clk *clk;
struct dentry *dir;
struct dentry *enable;
struct dentry *requests;
int enabled;
};
#ifdef CONFIG_DEBUG_FS
static struct dentry *clk_dir;
static struct dentry *clk_show;
static struct dentry *clk_show_enabled_only;
static struct clk_debug_info *cdi;
static int num_clks;
static int clk_show_print(struct seq_file *s, void *p)
{
int i;
int enabled_only = (int)s->private;
seq_printf(s, "\n%-20s %s\n", "name", "enabled (kernel + debug)");
for (i = 0; i < num_clks; i++) {
if (enabled_only && !cdi[i].clk->enabled)
continue;
seq_printf(s,
"%-20s %5d + %d\n",
cdi[i].clk->name,
cdi[i].clk->enabled - cdi[i].enabled,
cdi[i].enabled);
}
return 0;
}
static int clk_show_open(struct inode *inode, struct file *file)
{
return single_open(file, clk_show_print, inode->i_private);
}
static int clk_enable_print(struct seq_file *s, void *p)
{
struct clk_debug_info *cdi = s->private;
return seq_printf(s, "%d\n", cdi->enabled);
}
static int clk_enable_open(struct inode *inode, struct file *file)
{
return single_open(file, clk_enable_print, inode->i_private);
}
static ssize_t clk_enable_write(struct file *file, const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct clk_debug_info *cdi;
char buf[32];
ssize_t buf_size;
long user_val;
int err;
cdi = ((struct seq_file *)(file->private_data))->private;
buf_size = min(count, (sizeof(buf) - 1));
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
buf[buf_size] = '\0';
err = strict_strtol(buf, 0, &user_val);
if (err)
return -EINVAL;
if ((user_val > 0) && (!cdi->enabled)) {
err = clk_enable(cdi->clk);
if (err) {
pr_err("clock: clk_enable(%s) failed.\n",
cdi->clk->name);
return -EFAULT;
}
cdi->enabled = 1;
} else if ((user_val <= 0) && (cdi->enabled)) {
clk_disable(cdi->clk);
cdi->enabled = 0;
}
return buf_size;
}
static int clk_requests_print(struct seq_file *s, void *p)
{
struct clk_debug_info *cdi = s->private;
return seq_printf(s, "%d\n", cdi->clk->enabled);
}
static int clk_requests_open(struct inode *inode, struct file *file)
{
return single_open(file, clk_requests_print, inode->i_private);
}
static const struct file_operations clk_enable_fops = {
.open = clk_enable_open,
.write = clk_enable_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static const struct file_operations clk_requests_fops = {
.open = clk_requests_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static const struct file_operations clk_show_fops = {
.open = clk_show_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static int create_clk_dirs(struct clk_debug_info *cdi, int size)
{
int i;
for (i = 0; i < size; i++) {
cdi[i].dir = debugfs_create_dir(cdi[i].clk->name, clk_dir);
if (!cdi[i].dir)
goto no_dir;
}
for (i = 0; i < size; i++) {
cdi[i].enable = debugfs_create_file("enable",
(S_IRUGO | S_IWUGO),
cdi[i].dir, &cdi[i],
&clk_enable_fops);
if (!cdi[i].enable)
goto no_enable;
}
for (i = 0; i < size; i++) {
cdi[i].requests = debugfs_create_file("requests", S_IRUGO,
cdi[i].dir, &cdi[i],
&clk_requests_fops);
if (!cdi[i].requests)
goto no_requests;
}
return 0;
no_requests:
while (i--)
debugfs_remove(cdi[i].requests);
i = size;
no_enable:
while (i--)
debugfs_remove(cdi[i].enable);
i = size;
no_dir:
while (i--)
debugfs_remove(cdi[i].dir);
return -ENOMEM;
}
int __init dbx500_clk_debug_init(struct clk **clks, int num)
{
int i;
cdi = kcalloc(sizeof(struct clk_debug_info), num, GFP_KERNEL);
if (!cdi)
return -ENOMEM;
for (i = 0; i < num; i++)
cdi[i].clk = clks[i];
num_clks = num;
clk_dir = debugfs_create_dir("clk", NULL);
if (!clk_dir)
goto no_dir;
clk_show = debugfs_create_file("show", S_IRUGO, clk_dir, (void *)0,
&clk_show_fops);
if (!clk_show)
goto no_show;
clk_show_enabled_only = debugfs_create_file("show-enabled-only",
S_IRUGO, clk_dir, (void *)1,
&clk_show_fops);
if (!clk_show_enabled_only)
goto no_enabled_only;
if (create_clk_dirs(cdi, num))
goto no_clks;
return 0;
no_clks:
debugfs_remove(clk_show_enabled_only);
no_enabled_only:
debugfs_remove(clk_show);
no_show:
debugfs_remove(clk_dir);
no_dir:
kfree(cdi);
return -ENOMEM;
}
#endif /* CONFIG_DEBUG_FS */
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