M7350/kernel/drivers/soc/qcom/rpm-smd-debug.c
2024-09-09 08:57:42 +00:00

142 lines
3.4 KiB
C

/* Copyright (c) 2013-2014, 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.
*/
#define pr_fmt(fmt) "rpm-smd-debug: %s(): " fmt, __func__
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/list.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/slab.h>
#include <soc/qcom/rpm-smd.h>
#define MAX_MSG_BUFFER 350
#define MAX_KEY_VALUE_PAIRS 20
static struct dentry *rpm_debugfs_dir;
static u32 string_to_uint(const u8 *str)
{
int i, len;
u32 output = 0;
len = strnlen(str, sizeof(u32));
for (i = 0; i < len; i++)
output |= str[i] << (i * 8);
return output;
}
static ssize_t rsc_ops_write(struct file *fp, const char __user *user_buffer,
size_t count, loff_t *position)
{
char buf[MAX_MSG_BUFFER], rsc_type_str[6] = {}, rpm_set[8] = {},
key_str[6] = {};
int i, pos, set = -1, nelems;
char *cmp;
uint32_t rsc_type, rsc_id, key, data;
struct msm_rpm_request *req;
count = min(count, sizeof(buf) - 1);
if (copy_from_user(&buf, user_buffer, count))
return -EFAULT;
buf[count] = '\0';
cmp = strstrip(buf);
sscanf(cmp, "%7s %5s %u %d %n", rpm_set, rsc_type_str, &rsc_id,
&nelems, &pos);
if (strlen(rpm_set) > 6 || strlen(rsc_type_str) > 4) {
pr_err("Invalid value of set or resource type\n");
goto err;
}
if (!strcmp(rpm_set, "active"))
set = 0;
else if (!strcmp(rpm_set, "sleep"))
set = 1;
rsc_type = string_to_uint(rsc_type_str);
if (set < 0 || nelems < 0) {
pr_err("Invalid value of set or nelems\n");
goto err;
}
if (nelems > MAX_KEY_VALUE_PAIRS) {
pr_err("Exceeded max no of key-value entries\n");
goto err;
}
req = msm_rpm_create_request(set, rsc_type, rsc_id, nelems);
if (!req)
return -ENOMEM;
for (i = 0; i < nelems; i++) {
cmp += pos;
sscanf(cmp, "%5s %n", key_str, &pos);
if (strlen(key_str) > 4) {
pr_err("Key value cannot be more than 4 charecters");
goto err;
}
key = string_to_uint(key_str);
if (!key) {
pr_err("Key values entered incorrectly\n");
goto err;
}
cmp += pos;
sscanf(cmp, "%u %n", &data, &pos);
if (msm_rpm_add_kvp_data(req, key,
(void *)&data, sizeof(data)))
goto err_request;
}
if (msm_rpm_wait_for_ack(msm_rpm_send_request(req)))
pr_err("Sending the RPM message failed\n");
else
pr_info("RPM message sent succesfully\n");
err_request:
msm_rpm_free_request(req);
err:
return count;
}
static const struct file_operations rsc_ops = {
.write = rsc_ops_write,
};
static int __init rpm_smd_debugfs_init(void)
{
rpm_debugfs_dir = debugfs_create_dir("rpm_send_msg", NULL);
if (!rpm_debugfs_dir)
return -ENOMEM;
if (!debugfs_create_file("message", S_IWUSR, rpm_debugfs_dir, NULL,
&rsc_ops))
return -ENOMEM;
return 0;
}
late_initcall(rpm_smd_debugfs_init);
static void __exit rpm_smd_debugfs_exit(void)
{
debugfs_remove_recursive(rpm_debugfs_dir);
}
module_exit(rpm_smd_debugfs_exit);
MODULE_DESCRIPTION("RPM SMD Debug Driver");
MODULE_LICENSE("GPL");