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alistair23-linux/drivers/nfc/st-nci/ndlc.c
Thomas Gleixner 46fe777164 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 399 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  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 you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 33 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190531081038.745679586@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:37:12 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Low Level Transport (NDLC) Driver for STMicroelectronics NFC Chip
*
* Copyright (C) 2014-2015 STMicroelectronics SAS. All rights reserved.
*/
#include <linux/sched.h>
#include <net/nfc/nci_core.h>
#include "st-nci.h"
#define NDLC_TIMER_T1 100
#define NDLC_TIMER_T1_WAIT 400
#define NDLC_TIMER_T2 1200
#define PCB_TYPE_DATAFRAME 0x80
#define PCB_TYPE_SUPERVISOR 0xc0
#define PCB_TYPE_MASK PCB_TYPE_SUPERVISOR
#define PCB_SYNC_ACK 0x20
#define PCB_SYNC_NACK 0x10
#define PCB_SYNC_WAIT 0x30
#define PCB_SYNC_NOINFO 0x00
#define PCB_SYNC_MASK PCB_SYNC_WAIT
#define PCB_DATAFRAME_RETRANSMIT_YES 0x00
#define PCB_DATAFRAME_RETRANSMIT_NO 0x04
#define PCB_DATAFRAME_RETRANSMIT_MASK PCB_DATAFRAME_RETRANSMIT_NO
#define PCB_SUPERVISOR_RETRANSMIT_YES 0x00
#define PCB_SUPERVISOR_RETRANSMIT_NO 0x02
#define PCB_SUPERVISOR_RETRANSMIT_MASK PCB_SUPERVISOR_RETRANSMIT_NO
#define PCB_FRAME_CRC_INFO_PRESENT 0x08
#define PCB_FRAME_CRC_INFO_NOTPRESENT 0x00
#define PCB_FRAME_CRC_INFO_MASK PCB_FRAME_CRC_INFO_PRESENT
#define NDLC_DUMP_SKB(info, skb) \
do { \
pr_debug("%s:\n", info); \
print_hex_dump(KERN_DEBUG, "ndlc: ", DUMP_PREFIX_OFFSET, \
16, 1, skb->data, skb->len, 0); \
} while (0)
int ndlc_open(struct llt_ndlc *ndlc)
{
/* toggle reset pin */
ndlc->ops->enable(ndlc->phy_id);
ndlc->powered = 1;
return 0;
}
EXPORT_SYMBOL(ndlc_open);
void ndlc_close(struct llt_ndlc *ndlc)
{
struct nci_mode_set_cmd cmd;
cmd.cmd_type = ST_NCI_SET_NFC_MODE;
cmd.mode = 0;
/* toggle reset pin */
ndlc->ops->enable(ndlc->phy_id);
nci_prop_cmd(ndlc->ndev, ST_NCI_CORE_PROP,
sizeof(struct nci_mode_set_cmd), (__u8 *)&cmd);
ndlc->powered = 0;
ndlc->ops->disable(ndlc->phy_id);
}
EXPORT_SYMBOL(ndlc_close);
int ndlc_send(struct llt_ndlc *ndlc, struct sk_buff *skb)
{
/* add ndlc header */
u8 pcb = PCB_TYPE_DATAFRAME | PCB_DATAFRAME_RETRANSMIT_NO |
PCB_FRAME_CRC_INFO_NOTPRESENT;
*(u8 *)skb_push(skb, 1) = pcb;
skb_queue_tail(&ndlc->send_q, skb);
schedule_work(&ndlc->sm_work);
return 0;
}
EXPORT_SYMBOL(ndlc_send);
static void llt_ndlc_send_queue(struct llt_ndlc *ndlc)
{
struct sk_buff *skb;
int r;
unsigned long time_sent;
if (ndlc->send_q.qlen)
pr_debug("sendQlen=%d unackQlen=%d\n",
ndlc->send_q.qlen, ndlc->ack_pending_q.qlen);
while (ndlc->send_q.qlen) {
skb = skb_dequeue(&ndlc->send_q);
NDLC_DUMP_SKB("ndlc frame written", skb);
r = ndlc->ops->write(ndlc->phy_id, skb);
if (r < 0) {
ndlc->hard_fault = r;
break;
}
time_sent = jiffies;
*(unsigned long *)skb->cb = time_sent;
skb_queue_tail(&ndlc->ack_pending_q, skb);
/* start timer t1 for ndlc aknowledge */
ndlc->t1_active = true;
mod_timer(&ndlc->t1_timer, time_sent +
msecs_to_jiffies(NDLC_TIMER_T1));
/* start timer t2 for chip availability */
ndlc->t2_active = true;
mod_timer(&ndlc->t2_timer, time_sent +
msecs_to_jiffies(NDLC_TIMER_T2));
}
}
static void llt_ndlc_requeue_data_pending(struct llt_ndlc *ndlc)
{
struct sk_buff *skb;
u8 pcb;
while ((skb = skb_dequeue_tail(&ndlc->ack_pending_q))) {
pcb = skb->data[0];
switch (pcb & PCB_TYPE_MASK) {
case PCB_TYPE_SUPERVISOR:
skb->data[0] = (pcb & ~PCB_SUPERVISOR_RETRANSMIT_MASK) |
PCB_SUPERVISOR_RETRANSMIT_YES;
break;
case PCB_TYPE_DATAFRAME:
skb->data[0] = (pcb & ~PCB_DATAFRAME_RETRANSMIT_MASK) |
PCB_DATAFRAME_RETRANSMIT_YES;
break;
default:
pr_err("UNKNOWN Packet Control Byte=%d\n", pcb);
kfree_skb(skb);
continue;
}
skb_queue_head(&ndlc->send_q, skb);
}
}
static void llt_ndlc_rcv_queue(struct llt_ndlc *ndlc)
{
struct sk_buff *skb;
u8 pcb;
unsigned long time_sent;
if (ndlc->rcv_q.qlen)
pr_debug("rcvQlen=%d\n", ndlc->rcv_q.qlen);
while ((skb = skb_dequeue(&ndlc->rcv_q)) != NULL) {
pcb = skb->data[0];
skb_pull(skb, 1);
if ((pcb & PCB_TYPE_MASK) == PCB_TYPE_SUPERVISOR) {
switch (pcb & PCB_SYNC_MASK) {
case PCB_SYNC_ACK:
skb = skb_dequeue(&ndlc->ack_pending_q);
kfree_skb(skb);
del_timer_sync(&ndlc->t1_timer);
del_timer_sync(&ndlc->t2_timer);
ndlc->t2_active = false;
ndlc->t1_active = false;
break;
case PCB_SYNC_NACK:
llt_ndlc_requeue_data_pending(ndlc);
llt_ndlc_send_queue(ndlc);
/* start timer t1 for ndlc aknowledge */
time_sent = jiffies;
ndlc->t1_active = true;
mod_timer(&ndlc->t1_timer, time_sent +
msecs_to_jiffies(NDLC_TIMER_T1));
break;
case PCB_SYNC_WAIT:
time_sent = jiffies;
ndlc->t1_active = true;
mod_timer(&ndlc->t1_timer, time_sent +
msecs_to_jiffies(NDLC_TIMER_T1_WAIT));
break;
default:
kfree_skb(skb);
break;
}
} else if ((pcb & PCB_TYPE_MASK) == PCB_TYPE_DATAFRAME) {
nci_recv_frame(ndlc->ndev, skb);
} else {
kfree_skb(skb);
}
}
}
static void llt_ndlc_sm_work(struct work_struct *work)
{
struct llt_ndlc *ndlc = container_of(work, struct llt_ndlc, sm_work);
llt_ndlc_send_queue(ndlc);
llt_ndlc_rcv_queue(ndlc);
if (ndlc->t1_active && timer_pending(&ndlc->t1_timer) == 0) {
pr_debug
("Handle T1(recv SUPERVISOR) elapsed (T1 now inactive)\n");
ndlc->t1_active = false;
llt_ndlc_requeue_data_pending(ndlc);
llt_ndlc_send_queue(ndlc);
}
if (ndlc->t2_active && timer_pending(&ndlc->t2_timer) == 0) {
pr_debug("Handle T2(recv DATA) elapsed (T2 now inactive)\n");
ndlc->t2_active = false;
ndlc->t1_active = false;
del_timer_sync(&ndlc->t1_timer);
del_timer_sync(&ndlc->t2_timer);
ndlc_close(ndlc);
ndlc->hard_fault = -EREMOTEIO;
}
}
void ndlc_recv(struct llt_ndlc *ndlc, struct sk_buff *skb)
{
if (skb == NULL) {
pr_err("NULL Frame -> link is dead\n");
ndlc->hard_fault = -EREMOTEIO;
ndlc_close(ndlc);
} else {
NDLC_DUMP_SKB("incoming frame", skb);
skb_queue_tail(&ndlc->rcv_q, skb);
}
schedule_work(&ndlc->sm_work);
}
EXPORT_SYMBOL(ndlc_recv);
static void ndlc_t1_timeout(struct timer_list *t)
{
struct llt_ndlc *ndlc = from_timer(ndlc, t, t1_timer);
pr_debug("\n");
schedule_work(&ndlc->sm_work);
}
static void ndlc_t2_timeout(struct timer_list *t)
{
struct llt_ndlc *ndlc = from_timer(ndlc, t, t2_timer);
pr_debug("\n");
schedule_work(&ndlc->sm_work);
}
int ndlc_probe(void *phy_id, struct nfc_phy_ops *phy_ops, struct device *dev,
int phy_headroom, int phy_tailroom, struct llt_ndlc **ndlc_id,
struct st_nci_se_status *se_status)
{
struct llt_ndlc *ndlc;
ndlc = devm_kzalloc(dev, sizeof(struct llt_ndlc), GFP_KERNEL);
if (!ndlc)
return -ENOMEM;
ndlc->ops = phy_ops;
ndlc->phy_id = phy_id;
ndlc->dev = dev;
ndlc->powered = 0;
*ndlc_id = ndlc;
/* initialize timers */
timer_setup(&ndlc->t1_timer, ndlc_t1_timeout, 0);
timer_setup(&ndlc->t2_timer, ndlc_t2_timeout, 0);
skb_queue_head_init(&ndlc->rcv_q);
skb_queue_head_init(&ndlc->send_q);
skb_queue_head_init(&ndlc->ack_pending_q);
INIT_WORK(&ndlc->sm_work, llt_ndlc_sm_work);
return st_nci_probe(ndlc, phy_headroom, phy_tailroom, se_status);
}
EXPORT_SYMBOL(ndlc_probe);
void ndlc_remove(struct llt_ndlc *ndlc)
{
st_nci_remove(ndlc->ndev);
/* cancel timers */
del_timer_sync(&ndlc->t1_timer);
del_timer_sync(&ndlc->t2_timer);
ndlc->t2_active = false;
ndlc->t1_active = false;
skb_queue_purge(&ndlc->rcv_q);
skb_queue_purge(&ndlc->send_q);
}
EXPORT_SYMBOL(ndlc_remove);
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