Orange Pi5 kernel

/**
 * Marvell NFC-over-UART driver
 *
 * Copyright (C) 2015, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available on the worldwide web at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */
 
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/of_gpio.h>
#include <net/nfc/nci.h>
#include <net/nfc/nci_core.h>
#include "nfcmrvl.h"
 
static unsigned int hci_muxed;
static unsigned int flow_control;
static unsigned int break_control;
static int reset_n_io = -EINVAL;
 
/*
** NFCMRVL NCI OPS
*/
 
static int nfcmrvl_uart_nci_open(struct nfcmrvl_private *priv)
{
<------>return 0;
}
 
static int nfcmrvl_uart_nci_close(struct nfcmrvl_private *priv)
{
<------>return 0;
}
 
static int nfcmrvl_uart_nci_send(struct nfcmrvl_private *priv,
<------><------><------><------> struct sk_buff *skb)
{
<------>struct nci_uart *nu = priv->drv_data;
 
<------>return nu->ops.send(nu, skb);
}
 
static void nfcmrvl_uart_nci_update_config(struct nfcmrvl_private *priv,
<------><------><------><------><------>   const void *param)
{
<------>struct nci_uart *nu = priv->drv_data;
<------>const struct nfcmrvl_fw_uart_config *config = param;
 
<------>nci_uart_set_config(nu, le32_to_cpu(config->baudrate),
<------><------><------>    config->flow_control);
}
 
static struct nfcmrvl_if_ops uart_ops = {
<------>.nci_open = nfcmrvl_uart_nci_open,
<------>.nci_close = nfcmrvl_uart_nci_close,
<------>.nci_send = nfcmrvl_uart_nci_send,
<------>.nci_update_config = nfcmrvl_uart_nci_update_config
};
 
static int nfcmrvl_uart_parse_dt(struct device_node *node,
<------><------><------><------> struct nfcmrvl_platform_data *pdata)
{
<------>struct device_node *matched_node;
<------>int ret;
 
<------>matched_node = of_get_compatible_child(node, "marvell,nfc-uart");
<------>if (!matched_node) {
<------><------>matched_node = of_get_compatible_child(node, "mrvl,nfc-uart");
<------><------>if (!matched_node)
<------><------><------>return -ENODEV;
<------>}
 
<------>ret = nfcmrvl_parse_dt(matched_node, pdata);
<------>if (ret < 0) {
<------><------>pr_err("Failed to get generic entries\n");
<------><------>of_node_put(matched_node);
<------><------>return ret;
<------>}
 
<------>if (of_find_property(matched_node, "flow-control", NULL))
<------><------>pdata->flow_control = 1;
<------>else
<------><------>pdata->flow_control = 0;
 
<------>if (of_find_property(matched_node, "break-control", NULL))
<------><------>pdata->break_control = 1;
<------>else
<------><------>pdata->break_control = 0;
 
<------>of_node_put(matched_node);
 
<------>return 0;
}
 
/*
** NCI UART OPS
*/
 
static int nfcmrvl_nci_uart_open(struct nci_uart *nu)
{
<------>struct nfcmrvl_private *priv;
<------>struct nfcmrvl_platform_data *pdata = NULL;
<------>struct nfcmrvl_platform_data config;
<------>struct device *dev = nu->tty->dev;
 
<------>/*
<------> * Platform data cannot be used here since usually it is already used
<------> * by low level serial driver. We can try to retrieve serial device
<------> * and check if DT entries were added.
<------> */
 
<------>if (dev && dev->parent && dev->parent->of_node)
<------><------>if (nfcmrvl_uart_parse_dt(dev->parent->of_node, &config) == 0)
<------><------><------>pdata = &config;
 
<------>if (!pdata) {
<------><------>pr_info("No platform data / DT -> fallback to module params\n");
<------><------>config.hci_muxed = hci_muxed;
<------><------>config.reset_n_io = reset_n_io;
<------><------>config.flow_control = flow_control;
<------><------>config.break_control = break_control;
<------><------>pdata = &config;
<------>}
 
<------>priv = nfcmrvl_nci_register_dev(NFCMRVL_PHY_UART, nu, &uart_ops,
<------><------><------><------><------>dev, pdata);
<------>if (IS_ERR(priv))
<------><------>return PTR_ERR(priv);
 
<------>priv->support_fw_dnld = true;
 
<------>nu->drv_data = priv;
<------>nu->ndev = priv->ndev;
 
<------>return 0;
}
 
static void nfcmrvl_nci_uart_close(struct nci_uart *nu)
{
<------>nfcmrvl_nci_unregister_dev((struct nfcmrvl_private *)nu->drv_data);
}
 
static int nfcmrvl_nci_uart_recv(struct nci_uart *nu, struct sk_buff *skb)
{
<------>return nfcmrvl_nci_recv_frame((struct nfcmrvl_private *)nu->drv_data,
<------><------><------><------>      skb);
}
 
static void nfcmrvl_nci_uart_tx_start(struct nci_uart *nu)
{
<------>struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
 
<------>if (priv->ndev->nfc_dev->fw_download_in_progress)
<------><------>return;
 
<------>/* Remove BREAK to wake up the NFCC */
<------>if (priv->config.break_control && nu->tty->ops->break_ctl) {
<------><------>nu->tty->ops->break_ctl(nu->tty, 0);
<------><------>usleep_range(3000, 5000);
<------>}
}
 
static void nfcmrvl_nci_uart_tx_done(struct nci_uart *nu)
{
<------>struct nfcmrvl_private *priv = (struct nfcmrvl_private *)nu->drv_data;
 
<------>if (priv->ndev->nfc_dev->fw_download_in_progress)
<------><------>return;
 
<------>/*
<------>** To ensure that if the NFCC goes in DEEP SLEEP sate we can wake him
<------>** up. we set BREAK. Once we will be ready to send again we will remove
<------>** it.
<------>*/
<------>if (priv->config.break_control && nu->tty->ops->break_ctl) {
<------><------>nu->tty->ops->break_ctl(nu->tty, -1);
<------><------>usleep_range(1000, 3000);
<------>}
}
 
static struct nci_uart nfcmrvl_nci_uart = {
<------>.owner  = THIS_MODULE,
<------>.name   = "nfcmrvl_uart",
<------>.driver = NCI_UART_DRIVER_MARVELL,
<------>.ops	= {
<------><------>.open		= nfcmrvl_nci_uart_open,
<------><------>.close		= nfcmrvl_nci_uart_close,
<------><------>.recv		= nfcmrvl_nci_uart_recv,
<------><------>.tx_start	= nfcmrvl_nci_uart_tx_start,
<------><------>.tx_done	= nfcmrvl_nci_uart_tx_done,
<------>}
};
 
/*
** Module init
*/
 
static int nfcmrvl_uart_init_module(void)
{
<------>return nci_uart_register(&nfcmrvl_nci_uart);
}
 
static void nfcmrvl_uart_exit_module(void)
{
<------>nci_uart_unregister(&nfcmrvl_nci_uart);
}
 
module_init(nfcmrvl_uart_init_module);
module_exit(nfcmrvl_uart_exit_module);
 
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_DESCRIPTION("Marvell NFC-over-UART");
MODULE_LICENSE("GPL v2");
 
module_param(flow_control, uint, 0);
MODULE_PARM_DESC(flow_control, "Tell if UART needs flow control at init.");
 
module_param(break_control, uint, 0);
MODULE_PARM_DESC(break_control, "Tell if UART driver must drive break signal.");
 
module_param(hci_muxed, uint, 0);
MODULE_PARM_DESC(hci_muxed, "Tell if transport is muxed in HCI one.");
 
module_param(reset_n_io, int, 0);
MODULE_PARM_DESC(reset_n_io, "GPIO that is wired to RESET_N signal.");