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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Intel Corporation
*/
#include <linux/debugfs.h>
#include <linux/kernel.h>
#include <drm/drm_drv.h>
#include "intel_display_debugfs_params.h"
#include "i915_drv.h"
#include "intel_display_params.h"
/* int param */
static int intel_display_param_int_show(struct seq_file *m, void *data)
{
int *value = m->private;
seq_printf(m, "%d\n", *value);
return 0;
}
static int intel_display_param_int_open(struct inode *inode, struct file *file)
{
return single_open(file, intel_display_param_int_show, inode->i_private);
}
static ssize_t intel_display_param_int_write(struct file *file,
const char __user *ubuf, size_t len,
loff_t *offp)
{
struct seq_file *m = file->private_data;
int *value = m->private;
int ret;
ret = kstrtoint_from_user(ubuf, len, 0, value);
if (ret) {
/* support boolean values too */
bool b;
ret = kstrtobool_from_user(ubuf, len, &b);
if (!ret)
*value = b;
}
return ret ?: len;
}
static const struct file_operations intel_display_param_int_fops = {
.owner = THIS_MODULE,
.open = intel_display_param_int_open,
.read = seq_read,
.write = intel_display_param_int_write,
.llseek = default_llseek,
.release = single_release,
};
static const struct file_operations intel_display_param_int_fops_ro = {
.owner = THIS_MODULE,
.open = intel_display_param_int_open,
.read = seq_read,
.llseek = default_llseek,
.release = single_release,
};
/* unsigned int param */
static int intel_display_param_uint_show(struct seq_file *m, void *data)
{
unsigned int *value = m->private;
seq_printf(m, "%u\n", *value);
return 0;
}
static int intel_display_param_uint_open(struct inode *inode, struct file *file)
{
return single_open(file, intel_display_param_uint_show, inode->i_private);
}
static ssize_t intel_display_param_uint_write(struct file *file,
const char __user *ubuf, size_t len,
loff_t *offp)
{
struct seq_file *m = file->private_data;
unsigned int *value = m->private;
int ret;
ret = kstrtouint_from_user(ubuf, len, 0, value);
if (ret) {
/* support boolean values too */
bool b;
ret = kstrtobool_from_user(ubuf, len, &b);
if (!ret)
*value = b;
}
return ret ?: len;
}
static const struct file_operations intel_display_param_uint_fops = {
.owner = THIS_MODULE,
.open = intel_display_param_uint_open,
.read = seq_read,
.write = intel_display_param_uint_write,
.llseek = default_llseek,
.release = single_release,
};
static const struct file_operations intel_display_param_uint_fops_ro = {
.owner = THIS_MODULE,
.open = intel_display_param_uint_open,
.read = seq_read,
.llseek = default_llseek,
.release = single_release,
};
#define RO(mode) (((mode) & 0222) == 0)
__maybe_unused static struct dentry *
intel_display_debugfs_create_int(const char *name, umode_t mode,
struct dentry *parent, int *value)
{
return debugfs_create_file_unsafe(name, mode, parent, value,
RO(mode) ? &intel_display_param_int_fops_ro :
&intel_display_param_int_fops);
}
__maybe_unused static struct dentry *
intel_display_debugfs_create_uint(const char *name, umode_t mode,
struct dentry *parent, unsigned int *value)
{
return debugfs_create_file_unsafe(name, mode, parent, value,
RO(mode) ? &intel_display_param_uint_fops_ro :
&intel_display_param_uint_fops);
}
#define _intel_display_param_create_file(parent, name, mode, valp) \
do { \
if (mode) \
_Generic(valp, \
bool * : debugfs_create_bool, \
int * : intel_display_debugfs_create_int, \
unsigned int * : intel_display_debugfs_create_uint, \
unsigned long * : debugfs_create_ulong, \
char ** : debugfs_create_str) \
(name, mode, parent, valp); \
} while (0)
/* add a subdirectory with files for each intel display param */
void intel_display_debugfs_params(struct drm_i915_private *i915)
{
struct drm_minor *minor = i915->drm.primary;
struct dentry *dir;
char dirname[16];
snprintf(dirname, sizeof(dirname), "%s_params", i915->drm.driver->name);
dir = debugfs_lookup(dirname, minor->debugfs_root);
if (!dir)
dir = debugfs_create_dir(dirname, minor->debugfs_root);
if (IS_ERR(dir))
return;
/*
* Note: We could create files for params needing special handling
* here. Set mode in params to 0 to skip the generic create file, or
* just let the generic create file fail silently with -EEXIST.
*/
#define REGISTER(T, x, unused, mode, ...) _intel_display_param_create_file( \
dir, #x, mode, &i915->display.params.x);
INTEL_DISPLAY_PARAMS_FOR_EACH(REGISTER);
#undef REGISTER
}
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