| /* Copyright (c) 2013-2014, 2017, 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 = -1, set = -1, nelems = -1; |
| char *cmp; |
| uint32_t rsc_type = 0, rsc_id = 0, key = 0, data = 0; |
| 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); |
| |
| if (sscanf(cmp, "%7s %5s %u %d %n", rpm_set, rsc_type_str, |
| &rsc_id, &nelems, &pos) != 4) { |
| pr_err("Invalid number of arguments passed\n"); |
| goto err; |
| } |
| |
| 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; |
| if (sscanf(cmp, "%5s %n", key_str, &pos) != 1) { |
| pr_err("Invalid number of arguments passed\n"); |
| goto err; |
| } |
| |
| 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; |
| if (sscanf(cmp, "%u %n", &data, &pos) != 1) { |
| pr_err("Invalid number of arguments passed\n"); |
| goto err; |
| } |
| |
| 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"); |
| |
| 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", 0200, 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 v2"); |