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// SPDX-License-Identifier: GPL-2.0
/*
* UCSI debugfs interface
*
* Copyright (C) 2023 Intel Corporation
*
* Authors: Rajaram Regupathy <rajaram.regupathy@intel.com>
* Gopal Saranya <saranya.gopal@intel.com>
*/
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/usb.h>
#include <asm/errno.h>
#include "ucsi.h"
static struct dentry *ucsi_debugfs_root;
static int ucsi_cmd(void *data, u64 val)
{
struct ucsi *ucsi = data;
int ret;
memset(&ucsi->debugfs->response, 0, sizeof(ucsi->debugfs->response));
ucsi->debugfs->status = 0;
switch (UCSI_COMMAND(val)) {
case UCSI_SET_CCOM:
case UCSI_SET_UOR:
case UCSI_SET_PDR:
case UCSI_CONNECTOR_RESET:
case UCSI_SET_SINK_PATH:
case UCSI_SET_NEW_CAM:
case UCSI_SET_USB:
case UCSI_SET_POWER_LEVEL:
case UCSI_READ_POWER_LEVEL:
case UCSI_SET_PDOS:
ucsi->message_in_size = 0;
ret = ucsi_send_command(ucsi, val);
break;
case UCSI_GET_CAPABILITY:
case UCSI_GET_CONNECTOR_CAPABILITY:
case UCSI_GET_ALTERNATE_MODES:
case UCSI_GET_CAM_SUPPORTED:
case UCSI_GET_CURRENT_CAM:
case UCSI_GET_PDOS:
case UCSI_GET_CABLE_PROPERTY:
case UCSI_GET_CONNECTOR_STATUS:
case UCSI_GET_ERROR_STATUS:
case UCSI_GET_PD_MESSAGE:
case UCSI_GET_ATTENTION_VDO:
case UCSI_GET_CAM_CS:
case UCSI_GET_LPM_PPM_INFO:
ucsi->message_in_size = sizeof(ucsi->debugfs->response);
ret = ucsi_send_command(ucsi, val);
memcpy(&ucsi->debugfs->response, ucsi->message_in, sizeof(ucsi->debugfs->response));
break;
default:
ret = -EOPNOTSUPP;
}
if (ret < 0) {
ucsi->debugfs->status = ret;
return ret;
}
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(ucsi_cmd_fops, NULL, ucsi_cmd, "0x%llx\n");
static int ucsi_resp_show(struct seq_file *s, void *not_used)
{
struct ucsi *ucsi = s->private;
if (ucsi->debugfs->status)
return ucsi->debugfs->status;
seq_printf(s, "0x%016llx%016llx\n", ucsi->debugfs->response.high,
ucsi->debugfs->response.low);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_resp);
static int ucsi_peak_curr_show(struct seq_file *m, void *v)
{
struct ucsi *ucsi = m->private;
seq_printf(m, "%u mA\n", ucsi->connector->peak_current);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_peak_curr);
static int ucsi_avg_curr_show(struct seq_file *m, void *v)
{
struct ucsi *ucsi = m->private;
seq_printf(m, "%u mA\n", ucsi->connector->avg_current);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_avg_curr);
static int ucsi_vbus_volt_show(struct seq_file *m, void *v)
{
struct ucsi *ucsi = m->private;
seq_printf(m, "%u mV\n", ucsi->connector->vbus_voltage);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ucsi_vbus_volt);
static ssize_t ucsi_message_out_write(struct file *file,
const char __user *data, size_t count, loff_t *ppos)
{
struct ucsi *ucsi = file->private_data;
int ret;
char *buf __free(kfree) = memdup_user_nul(data, count);
if (IS_ERR(buf))
return PTR_ERR(buf);
ucsi->message_out_size = min(count / 2, UCSI_MAX_MESSAGE_OUT_LENGTH);
ret = hex2bin(ucsi->message_out, buf, ucsi->message_out_size);
if (ret)
return ret;
return count;
}
static const struct file_operations ucsi_message_out_fops = {
.open = simple_open,
.write = ucsi_message_out_write,
.llseek = generic_file_llseek,
};
void ucsi_debugfs_register(struct ucsi *ucsi)
{
ucsi->debugfs = kzalloc(sizeof(*ucsi->debugfs), GFP_KERNEL);
if (!ucsi->debugfs)
return;
ucsi->debugfs->dentry = debugfs_create_dir(dev_name(ucsi->dev), ucsi_debugfs_root);
debugfs_create_file("command", 0200, ucsi->debugfs->dentry, ucsi, &ucsi_cmd_fops);
debugfs_create_file("response", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_resp_fops);
debugfs_create_file("peak_current", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_peak_curr_fops);
debugfs_create_file("avg_current", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_avg_curr_fops);
debugfs_create_file("vbus_voltage", 0400, ucsi->debugfs->dentry, ucsi, &ucsi_vbus_volt_fops);
debugfs_create_file("message_out", 0200, ucsi->debugfs->dentry, ucsi,
&ucsi_message_out_fops);
}
void ucsi_debugfs_unregister(struct ucsi *ucsi)
{
if (IS_ERR_OR_NULL(ucsi) || !ucsi->debugfs)
return;
debugfs_remove_recursive(ucsi->debugfs->dentry);
kfree(ucsi->debugfs);
}
void ucsi_debugfs_init(void)
{
ucsi_debugfs_root = debugfs_create_dir("ucsi", usb_debug_root);
}
void ucsi_debugfs_exit(void)
{
debugfs_remove(ucsi_debugfs_root);
}
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