53cf3e9ecb
Add makefile, kbuild, and android.mk to compile mmrm driver as an external kernel module. Modify debugfs with new return type. Change-Id: I370fac4d985bbe491be7fdab846eb3b60d6a3c4d
77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020, The Linux Foundation. All rights reserved.
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*/
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#include <linux/slab.h>
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#include "mmrm_debug.h"
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int msm_mmrm_debug = MMRM_ERR | MMRM_WARN | MMRM_PRINTK;
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#define MAX_DBG_BUF_SIZE 4096
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static ssize_t msm_mmrm_debugfs_info_read(
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struct file *file, char __user *buf, size_t count, loff_t *ppos)
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{
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char *dbuf, *cur, *end;
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ssize_t len = 0;
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dbuf = kzalloc(MAX_DBG_BUF_SIZE, GFP_KERNEL);
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if (!dbuf) {
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d_mpr_e("%s: Allocation failed!\n", __func__);
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return -ENOMEM;
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}
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cur = dbuf;
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end = cur + MAX_DBG_BUF_SIZE;
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// TODO: Fill cur here
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len = simple_read_from_buffer(buf, count, ppos, dbuf, cur - dbuf);
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kfree(dbuf);
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return len;
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}
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const struct file_operations msm_mmrm_debugfs_info_fops = {
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.open = simple_open,
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.read = msm_mmrm_debugfs_info_read,
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};
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struct dentry *msm_mmrm_debugfs_init(void)
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{
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struct dentry *dir;
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int file_val;
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d_mpr_h("%s: entering\n", __func__);
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/* create a directory in debugfs root (/sys/kernel/debug) */
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dir = debugfs_create_dir("msm_mmrm", NULL);
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if (IS_ERR_OR_NULL(dir)) {
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d_mpr_e("%s: Call to debugfs_create_dir(%s) failed!\n", __func__, "mmrm");
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goto failed_create_dir;
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}
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/* basic info */
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if (!debugfs_create_file("info", 0444, dir, &file_val, &msm_mmrm_debugfs_info_fops)) {
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d_mpr_e("%s: Call to debugfs_create_file(%s) failed!\n", __func__, "info");
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goto failed_create_dir;
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}
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/* add other params here */
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debugfs_create_u32("debug_level", 0644, dir, &msm_mmrm_debug);
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d_mpr_h("%s: exiting\n", __func__);
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return dir;
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failed_create_dir:
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d_mpr_h("%s: error exit\n", __func__);
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return NULL;
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}
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void msm_mmrm_debugfs_deinit(struct dentry *dir)
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{
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d_mpr_h("%s: entering\n", __func__);
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debugfs_remove_recursive(dir);
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d_mpr_h("%s: exiting\n", __func__);
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}
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