mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
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 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 263 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141901.208660670@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
853 lines
20 KiB
C
853 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* NFC Digital Protocol stack
|
|
* Copyright (c) 2013, Intel Corporation.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "digital: %s: " fmt, __func__
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include "digital.h"
|
|
|
|
#define DIGITAL_PROTO_NFCA_RF_TECH \
|
|
(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK | \
|
|
NFC_PROTO_NFC_DEP_MASK | NFC_PROTO_ISO14443_MASK)
|
|
|
|
#define DIGITAL_PROTO_NFCB_RF_TECH NFC_PROTO_ISO14443_B_MASK
|
|
|
|
#define DIGITAL_PROTO_NFCF_RF_TECH \
|
|
(NFC_PROTO_FELICA_MASK | NFC_PROTO_NFC_DEP_MASK)
|
|
|
|
#define DIGITAL_PROTO_ISO15693_RF_TECH NFC_PROTO_ISO15693_MASK
|
|
|
|
/* Delay between each poll frame (ms) */
|
|
#define DIGITAL_POLL_INTERVAL 10
|
|
|
|
struct digital_cmd {
|
|
struct list_head queue;
|
|
|
|
u8 type;
|
|
u8 pending;
|
|
|
|
u16 timeout;
|
|
struct sk_buff *req;
|
|
struct sk_buff *resp;
|
|
struct digital_tg_mdaa_params *mdaa_params;
|
|
|
|
nfc_digital_cmd_complete_t cmd_cb;
|
|
void *cb_context;
|
|
};
|
|
|
|
struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
|
|
unsigned int len)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
|
|
GFP_KERNEL);
|
|
if (skb)
|
|
skb_reserve(skb, ddev->tx_headroom);
|
|
|
|
return skb;
|
|
}
|
|
|
|
void digital_skb_add_crc(struct sk_buff *skb, crc_func_t crc_func, u16 init,
|
|
u8 bitwise_inv, u8 msb_first)
|
|
{
|
|
u16 crc;
|
|
|
|
crc = crc_func(init, skb->data, skb->len);
|
|
|
|
if (bitwise_inv)
|
|
crc = ~crc;
|
|
|
|
if (msb_first)
|
|
crc = __fswab16(crc);
|
|
|
|
skb_put_u8(skb, crc & 0xFF);
|
|
skb_put_u8(skb, (crc >> 8) & 0xFF);
|
|
}
|
|
|
|
int digital_skb_check_crc(struct sk_buff *skb, crc_func_t crc_func,
|
|
u16 crc_init, u8 bitwise_inv, u8 msb_first)
|
|
{
|
|
int rc;
|
|
u16 crc;
|
|
|
|
if (skb->len <= 2)
|
|
return -EIO;
|
|
|
|
crc = crc_func(crc_init, skb->data, skb->len - 2);
|
|
|
|
if (bitwise_inv)
|
|
crc = ~crc;
|
|
|
|
if (msb_first)
|
|
crc = __swab16(crc);
|
|
|
|
rc = (skb->data[skb->len - 2] - (crc & 0xFF)) +
|
|
(skb->data[skb->len - 1] - ((crc >> 8) & 0xFF));
|
|
|
|
if (rc)
|
|
return -EIO;
|
|
|
|
skb_trim(skb, skb->len - 2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
|
|
{
|
|
ddev->ops->switch_rf(ddev, on);
|
|
}
|
|
|
|
static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
|
|
{
|
|
ddev->ops->abort_cmd(ddev);
|
|
}
|
|
|
|
static void digital_wq_cmd_complete(struct work_struct *work)
|
|
{
|
|
struct digital_cmd *cmd;
|
|
struct nfc_digital_dev *ddev = container_of(work,
|
|
struct nfc_digital_dev,
|
|
cmd_complete_work);
|
|
|
|
mutex_lock(&ddev->cmd_lock);
|
|
|
|
cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
|
|
queue);
|
|
if (!cmd) {
|
|
mutex_unlock(&ddev->cmd_lock);
|
|
return;
|
|
}
|
|
|
|
list_del(&cmd->queue);
|
|
|
|
mutex_unlock(&ddev->cmd_lock);
|
|
|
|
if (!IS_ERR(cmd->resp))
|
|
print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
|
|
cmd->resp->data, cmd->resp->len, false);
|
|
|
|
cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
|
|
|
|
kfree(cmd->mdaa_params);
|
|
kfree(cmd);
|
|
|
|
schedule_work(&ddev->cmd_work);
|
|
}
|
|
|
|
static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
|
|
void *arg, struct sk_buff *resp)
|
|
{
|
|
struct digital_cmd *cmd = arg;
|
|
|
|
cmd->resp = resp;
|
|
|
|
schedule_work(&ddev->cmd_complete_work);
|
|
}
|
|
|
|
static void digital_wq_cmd(struct work_struct *work)
|
|
{
|
|
int rc;
|
|
struct digital_cmd *cmd;
|
|
struct digital_tg_mdaa_params *params;
|
|
struct nfc_digital_dev *ddev = container_of(work,
|
|
struct nfc_digital_dev,
|
|
cmd_work);
|
|
|
|
mutex_lock(&ddev->cmd_lock);
|
|
|
|
cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
|
|
queue);
|
|
if (!cmd || cmd->pending) {
|
|
mutex_unlock(&ddev->cmd_lock);
|
|
return;
|
|
}
|
|
|
|
cmd->pending = 1;
|
|
|
|
mutex_unlock(&ddev->cmd_lock);
|
|
|
|
if (cmd->req)
|
|
print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
|
|
cmd->req->data, cmd->req->len, false);
|
|
|
|
switch (cmd->type) {
|
|
case DIGITAL_CMD_IN_SEND:
|
|
rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
|
|
digital_send_cmd_complete, cmd);
|
|
break;
|
|
|
|
case DIGITAL_CMD_TG_SEND:
|
|
rc = ddev->ops->tg_send_cmd(ddev, cmd->req, cmd->timeout,
|
|
digital_send_cmd_complete, cmd);
|
|
break;
|
|
|
|
case DIGITAL_CMD_TG_LISTEN:
|
|
rc = ddev->ops->tg_listen(ddev, cmd->timeout,
|
|
digital_send_cmd_complete, cmd);
|
|
break;
|
|
|
|
case DIGITAL_CMD_TG_LISTEN_MDAA:
|
|
params = cmd->mdaa_params;
|
|
|
|
rc = ddev->ops->tg_listen_mdaa(ddev, params, cmd->timeout,
|
|
digital_send_cmd_complete, cmd);
|
|
break;
|
|
|
|
case DIGITAL_CMD_TG_LISTEN_MD:
|
|
rc = ddev->ops->tg_listen_md(ddev, cmd->timeout,
|
|
digital_send_cmd_complete, cmd);
|
|
break;
|
|
|
|
default:
|
|
pr_err("Unknown cmd type %d\n", cmd->type);
|
|
return;
|
|
}
|
|
|
|
if (!rc)
|
|
return;
|
|
|
|
pr_err("in_send_command returned err %d\n", rc);
|
|
|
|
mutex_lock(&ddev->cmd_lock);
|
|
list_del(&cmd->queue);
|
|
mutex_unlock(&ddev->cmd_lock);
|
|
|
|
kfree_skb(cmd->req);
|
|
kfree(cmd->mdaa_params);
|
|
kfree(cmd);
|
|
|
|
schedule_work(&ddev->cmd_work);
|
|
}
|
|
|
|
int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
|
|
struct sk_buff *skb, struct digital_tg_mdaa_params *params,
|
|
u16 timeout, nfc_digital_cmd_complete_t cmd_cb,
|
|
void *cb_context)
|
|
{
|
|
struct digital_cmd *cmd;
|
|
|
|
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
|
|
if (!cmd)
|
|
return -ENOMEM;
|
|
|
|
cmd->type = cmd_type;
|
|
cmd->timeout = timeout;
|
|
cmd->req = skb;
|
|
cmd->mdaa_params = params;
|
|
cmd->cmd_cb = cmd_cb;
|
|
cmd->cb_context = cb_context;
|
|
INIT_LIST_HEAD(&cmd->queue);
|
|
|
|
mutex_lock(&ddev->cmd_lock);
|
|
list_add_tail(&cmd->queue, &ddev->cmd_queue);
|
|
mutex_unlock(&ddev->cmd_lock);
|
|
|
|
schedule_work(&ddev->cmd_work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
|
|
{
|
|
int rc;
|
|
|
|
rc = ddev->ops->in_configure_hw(ddev, type, param);
|
|
if (rc)
|
|
pr_err("in_configure_hw failed: %d\n", rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int digital_tg_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
|
|
{
|
|
int rc;
|
|
|
|
rc = ddev->ops->tg_configure_hw(ddev, type, param);
|
|
if (rc)
|
|
pr_err("tg_configure_hw failed: %d\n", rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int digital_tg_listen_mdaa(struct nfc_digital_dev *ddev, u8 rf_tech)
|
|
{
|
|
struct digital_tg_mdaa_params *params;
|
|
|
|
params = kzalloc(sizeof(*params), GFP_KERNEL);
|
|
if (!params)
|
|
return -ENOMEM;
|
|
|
|
params->sens_res = DIGITAL_SENS_RES_NFC_DEP;
|
|
get_random_bytes(params->nfcid1, sizeof(params->nfcid1));
|
|
params->sel_res = DIGITAL_SEL_RES_NFC_DEP;
|
|
|
|
params->nfcid2[0] = DIGITAL_SENSF_NFCID2_NFC_DEP_B1;
|
|
params->nfcid2[1] = DIGITAL_SENSF_NFCID2_NFC_DEP_B2;
|
|
get_random_bytes(params->nfcid2 + 2, NFC_NFCID2_MAXSIZE - 2);
|
|
params->sc = DIGITAL_SENSF_FELICA_SC;
|
|
|
|
return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MDAA, NULL, params,
|
|
500, digital_tg_recv_atr_req, NULL);
|
|
}
|
|
|
|
static int digital_tg_listen_md(struct nfc_digital_dev *ddev, u8 rf_tech)
|
|
{
|
|
return digital_send_cmd(ddev, DIGITAL_CMD_TG_LISTEN_MD, NULL, NULL, 500,
|
|
digital_tg_recv_md_req, NULL);
|
|
}
|
|
|
|
int digital_target_found(struct nfc_digital_dev *ddev,
|
|
struct nfc_target *target, u8 protocol)
|
|
{
|
|
int rc;
|
|
u8 framing;
|
|
u8 rf_tech;
|
|
u8 poll_tech_count;
|
|
int (*check_crc)(struct sk_buff *skb);
|
|
void (*add_crc)(struct sk_buff *skb);
|
|
|
|
rf_tech = ddev->poll_techs[ddev->poll_tech_index].rf_tech;
|
|
|
|
switch (protocol) {
|
|
case NFC_PROTO_JEWEL:
|
|
framing = NFC_DIGITAL_FRAMING_NFCA_T1T;
|
|
check_crc = digital_skb_check_crc_b;
|
|
add_crc = digital_skb_add_crc_b;
|
|
break;
|
|
|
|
case NFC_PROTO_MIFARE:
|
|
framing = NFC_DIGITAL_FRAMING_NFCA_T2T;
|
|
check_crc = digital_skb_check_crc_a;
|
|
add_crc = digital_skb_add_crc_a;
|
|
break;
|
|
|
|
case NFC_PROTO_FELICA:
|
|
framing = NFC_DIGITAL_FRAMING_NFCF_T3T;
|
|
check_crc = digital_skb_check_crc_f;
|
|
add_crc = digital_skb_add_crc_f;
|
|
break;
|
|
|
|
case NFC_PROTO_NFC_DEP:
|
|
if (rf_tech == NFC_DIGITAL_RF_TECH_106A) {
|
|
framing = NFC_DIGITAL_FRAMING_NFCA_NFC_DEP;
|
|
check_crc = digital_skb_check_crc_a;
|
|
add_crc = digital_skb_add_crc_a;
|
|
} else {
|
|
framing = NFC_DIGITAL_FRAMING_NFCF_NFC_DEP;
|
|
check_crc = digital_skb_check_crc_f;
|
|
add_crc = digital_skb_add_crc_f;
|
|
}
|
|
break;
|
|
|
|
case NFC_PROTO_ISO15693:
|
|
framing = NFC_DIGITAL_FRAMING_ISO15693_T5T;
|
|
check_crc = digital_skb_check_crc_b;
|
|
add_crc = digital_skb_add_crc_b;
|
|
break;
|
|
|
|
case NFC_PROTO_ISO14443:
|
|
framing = NFC_DIGITAL_FRAMING_NFCA_T4T;
|
|
check_crc = digital_skb_check_crc_a;
|
|
add_crc = digital_skb_add_crc_a;
|
|
break;
|
|
|
|
case NFC_PROTO_ISO14443_B:
|
|
framing = NFC_DIGITAL_FRAMING_NFCB_T4T;
|
|
check_crc = digital_skb_check_crc_b;
|
|
add_crc = digital_skb_add_crc_b;
|
|
break;
|
|
|
|
default:
|
|
pr_err("Invalid protocol %d\n", protocol);
|
|
return -EINVAL;
|
|
}
|
|
|
|
pr_debug("rf_tech=%d, protocol=%d\n", rf_tech, protocol);
|
|
|
|
ddev->curr_rf_tech = rf_tech;
|
|
|
|
if (DIGITAL_DRV_CAPS_IN_CRC(ddev)) {
|
|
ddev->skb_add_crc = digital_skb_add_crc_none;
|
|
ddev->skb_check_crc = digital_skb_check_crc_none;
|
|
} else {
|
|
ddev->skb_add_crc = add_crc;
|
|
ddev->skb_check_crc = check_crc;
|
|
}
|
|
|
|
rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING, framing);
|
|
if (rc)
|
|
return rc;
|
|
|
|
target->supported_protocols = (1 << protocol);
|
|
|
|
poll_tech_count = ddev->poll_tech_count;
|
|
ddev->poll_tech_count = 0;
|
|
|
|
rc = nfc_targets_found(ddev->nfc_dev, target, 1);
|
|
if (rc) {
|
|
ddev->poll_tech_count = poll_tech_count;
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void digital_poll_next_tech(struct nfc_digital_dev *ddev)
|
|
{
|
|
u8 rand_mod;
|
|
|
|
digital_switch_rf(ddev, 0);
|
|
|
|
mutex_lock(&ddev->poll_lock);
|
|
|
|
if (!ddev->poll_tech_count) {
|
|
mutex_unlock(&ddev->poll_lock);
|
|
return;
|
|
}
|
|
|
|
get_random_bytes(&rand_mod, sizeof(rand_mod));
|
|
ddev->poll_tech_index = rand_mod % ddev->poll_tech_count;
|
|
|
|
mutex_unlock(&ddev->poll_lock);
|
|
|
|
schedule_delayed_work(&ddev->poll_work,
|
|
msecs_to_jiffies(DIGITAL_POLL_INTERVAL));
|
|
}
|
|
|
|
static void digital_wq_poll(struct work_struct *work)
|
|
{
|
|
int rc;
|
|
struct digital_poll_tech *poll_tech;
|
|
struct nfc_digital_dev *ddev = container_of(work,
|
|
struct nfc_digital_dev,
|
|
poll_work.work);
|
|
mutex_lock(&ddev->poll_lock);
|
|
|
|
if (!ddev->poll_tech_count) {
|
|
mutex_unlock(&ddev->poll_lock);
|
|
return;
|
|
}
|
|
|
|
poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
|
|
|
|
mutex_unlock(&ddev->poll_lock);
|
|
|
|
rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
|
|
if (rc)
|
|
digital_poll_next_tech(ddev);
|
|
}
|
|
|
|
static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
|
|
digital_poll_t poll_func)
|
|
{
|
|
struct digital_poll_tech *poll_tech;
|
|
|
|
if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
|
|
return;
|
|
|
|
poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
|
|
|
|
poll_tech->rf_tech = rf_tech;
|
|
poll_tech->poll_func = poll_func;
|
|
}
|
|
|
|
/**
|
|
* start_poll operation
|
|
*
|
|
* For every supported protocol, the corresponding polling function is added
|
|
* to the table of polling technologies (ddev->poll_techs[]) using
|
|
* digital_add_poll_tech().
|
|
* When a polling function fails (by timeout or protocol error) the next one is
|
|
* schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
|
|
*/
|
|
static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
|
|
__u32 tm_protocols)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
u32 matching_im_protocols, matching_tm_protocols;
|
|
|
|
pr_debug("protocols: im 0x%x, tm 0x%x, supported 0x%x\n", im_protocols,
|
|
tm_protocols, ddev->protocols);
|
|
|
|
matching_im_protocols = ddev->protocols & im_protocols;
|
|
matching_tm_protocols = ddev->protocols & tm_protocols;
|
|
|
|
if (!matching_im_protocols && !matching_tm_protocols) {
|
|
pr_err("Unknown protocol\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ddev->poll_tech_count) {
|
|
pr_err("Already polling\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (ddev->curr_protocol) {
|
|
pr_err("A target is already active\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
ddev->poll_tech_count = 0;
|
|
ddev->poll_tech_index = 0;
|
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
|
|
digital_in_send_sens_req);
|
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_NFCB_RF_TECH)
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106B,
|
|
digital_in_send_sensb_req);
|
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_NFCF_RF_TECH) {
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
|
|
digital_in_send_sensf_req);
|
|
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
|
|
digital_in_send_sensf_req);
|
|
}
|
|
|
|
if (matching_im_protocols & DIGITAL_PROTO_ISO15693_RF_TECH)
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_ISO15693,
|
|
digital_in_send_iso15693_inv_req);
|
|
|
|
if (matching_tm_protocols & NFC_PROTO_NFC_DEP_MASK) {
|
|
if (ddev->ops->tg_listen_mdaa) {
|
|
digital_add_poll_tech(ddev, 0,
|
|
digital_tg_listen_mdaa);
|
|
} else if (ddev->ops->tg_listen_md) {
|
|
digital_add_poll_tech(ddev, 0,
|
|
digital_tg_listen_md);
|
|
} else {
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
|
|
digital_tg_listen_nfca);
|
|
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_212F,
|
|
digital_tg_listen_nfcf);
|
|
|
|
digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_424F,
|
|
digital_tg_listen_nfcf);
|
|
}
|
|
}
|
|
|
|
if (!ddev->poll_tech_count) {
|
|
pr_err("Unsupported protocols: im=0x%x, tm=0x%x\n",
|
|
matching_im_protocols, matching_tm_protocols);
|
|
return -EINVAL;
|
|
}
|
|
|
|
schedule_delayed_work(&ddev->poll_work, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void digital_stop_poll(struct nfc_dev *nfc_dev)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
|
|
mutex_lock(&ddev->poll_lock);
|
|
|
|
if (!ddev->poll_tech_count) {
|
|
pr_err("Polling operation was not running\n");
|
|
mutex_unlock(&ddev->poll_lock);
|
|
return;
|
|
}
|
|
|
|
ddev->poll_tech_count = 0;
|
|
|
|
mutex_unlock(&ddev->poll_lock);
|
|
|
|
cancel_delayed_work_sync(&ddev->poll_work);
|
|
|
|
digital_abort_cmd(ddev);
|
|
}
|
|
|
|
static int digital_dev_up(struct nfc_dev *nfc_dev)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
|
|
digital_switch_rf(ddev, 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int digital_dev_down(struct nfc_dev *nfc_dev)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
|
|
digital_switch_rf(ddev, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int digital_dep_link_up(struct nfc_dev *nfc_dev,
|
|
struct nfc_target *target,
|
|
__u8 comm_mode, __u8 *gb, size_t gb_len)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
int rc;
|
|
|
|
rc = digital_in_send_atr_req(ddev, target, comm_mode, gb, gb_len);
|
|
|
|
if (!rc)
|
|
ddev->curr_protocol = NFC_PROTO_NFC_DEP;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int digital_dep_link_down(struct nfc_dev *nfc_dev)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
|
|
digital_abort_cmd(ddev);
|
|
|
|
ddev->curr_protocol = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int digital_activate_target(struct nfc_dev *nfc_dev,
|
|
struct nfc_target *target, __u32 protocol)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
|
|
if (ddev->poll_tech_count) {
|
|
pr_err("Can't activate a target while polling\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (ddev->curr_protocol) {
|
|
pr_err("A target is already active\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
ddev->curr_protocol = protocol;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void digital_deactivate_target(struct nfc_dev *nfc_dev,
|
|
struct nfc_target *target,
|
|
u8 mode)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
|
|
if (!ddev->curr_protocol) {
|
|
pr_err("No active target\n");
|
|
return;
|
|
}
|
|
|
|
digital_abort_cmd(ddev);
|
|
ddev->curr_protocol = 0;
|
|
}
|
|
|
|
static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(dev);
|
|
|
|
return digital_tg_send_dep_res(ddev, skb);
|
|
}
|
|
|
|
static void digital_in_send_complete(struct nfc_digital_dev *ddev, void *arg,
|
|
struct sk_buff *resp)
|
|
{
|
|
struct digital_data_exch *data_exch = arg;
|
|
int rc;
|
|
|
|
if (IS_ERR(resp)) {
|
|
rc = PTR_ERR(resp);
|
|
resp = NULL;
|
|
goto done;
|
|
}
|
|
|
|
if (ddev->curr_protocol == NFC_PROTO_MIFARE) {
|
|
rc = digital_in_recv_mifare_res(resp);
|
|
/* crc check is done in digital_in_recv_mifare_res() */
|
|
goto done;
|
|
}
|
|
|
|
if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
|
|
(ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
|
|
rc = digital_in_iso_dep_pull_sod(ddev, resp);
|
|
if (rc)
|
|
goto done;
|
|
}
|
|
|
|
rc = ddev->skb_check_crc(resp);
|
|
|
|
done:
|
|
if (rc) {
|
|
kfree_skb(resp);
|
|
resp = NULL;
|
|
}
|
|
|
|
data_exch->cb(data_exch->cb_context, resp, rc);
|
|
|
|
kfree(data_exch);
|
|
}
|
|
|
|
static int digital_in_send(struct nfc_dev *nfc_dev, struct nfc_target *target,
|
|
struct sk_buff *skb, data_exchange_cb_t cb,
|
|
void *cb_context)
|
|
{
|
|
struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
|
|
struct digital_data_exch *data_exch;
|
|
int rc;
|
|
|
|
data_exch = kzalloc(sizeof(*data_exch), GFP_KERNEL);
|
|
if (!data_exch)
|
|
return -ENOMEM;
|
|
|
|
data_exch->cb = cb;
|
|
data_exch->cb_context = cb_context;
|
|
|
|
if (ddev->curr_protocol == NFC_PROTO_NFC_DEP) {
|
|
rc = digital_in_send_dep_req(ddev, target, skb, data_exch);
|
|
goto exit;
|
|
}
|
|
|
|
if ((ddev->curr_protocol == NFC_PROTO_ISO14443) ||
|
|
(ddev->curr_protocol == NFC_PROTO_ISO14443_B)) {
|
|
rc = digital_in_iso_dep_push_sod(ddev, skb);
|
|
if (rc)
|
|
goto exit;
|
|
}
|
|
|
|
ddev->skb_add_crc(skb);
|
|
|
|
rc = digital_in_send_cmd(ddev, skb, 500, digital_in_send_complete,
|
|
data_exch);
|
|
|
|
exit:
|
|
if (rc)
|
|
kfree(data_exch);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct nfc_ops digital_nfc_ops = {
|
|
.dev_up = digital_dev_up,
|
|
.dev_down = digital_dev_down,
|
|
.start_poll = digital_start_poll,
|
|
.stop_poll = digital_stop_poll,
|
|
.dep_link_up = digital_dep_link_up,
|
|
.dep_link_down = digital_dep_link_down,
|
|
.activate_target = digital_activate_target,
|
|
.deactivate_target = digital_deactivate_target,
|
|
.tm_send = digital_tg_send,
|
|
.im_transceive = digital_in_send,
|
|
};
|
|
|
|
struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
|
|
__u32 supported_protocols,
|
|
__u32 driver_capabilities,
|
|
int tx_headroom, int tx_tailroom)
|
|
{
|
|
struct nfc_digital_dev *ddev;
|
|
|
|
if (!ops->in_configure_hw || !ops->in_send_cmd || !ops->tg_listen ||
|
|
!ops->tg_configure_hw || !ops->tg_send_cmd || !ops->abort_cmd ||
|
|
!ops->switch_rf || (ops->tg_listen_md && !ops->tg_get_rf_tech))
|
|
return NULL;
|
|
|
|
ddev = kzalloc(sizeof(*ddev), GFP_KERNEL);
|
|
if (!ddev)
|
|
return NULL;
|
|
|
|
ddev->driver_capabilities = driver_capabilities;
|
|
ddev->ops = ops;
|
|
|
|
mutex_init(&ddev->cmd_lock);
|
|
INIT_LIST_HEAD(&ddev->cmd_queue);
|
|
|
|
INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
|
|
INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
|
|
|
|
mutex_init(&ddev->poll_lock);
|
|
INIT_DELAYED_WORK(&ddev->poll_work, digital_wq_poll);
|
|
|
|
if (supported_protocols & NFC_PROTO_JEWEL_MASK)
|
|
ddev->protocols |= NFC_PROTO_JEWEL_MASK;
|
|
if (supported_protocols & NFC_PROTO_MIFARE_MASK)
|
|
ddev->protocols |= NFC_PROTO_MIFARE_MASK;
|
|
if (supported_protocols & NFC_PROTO_FELICA_MASK)
|
|
ddev->protocols |= NFC_PROTO_FELICA_MASK;
|
|
if (supported_protocols & NFC_PROTO_NFC_DEP_MASK)
|
|
ddev->protocols |= NFC_PROTO_NFC_DEP_MASK;
|
|
if (supported_protocols & NFC_PROTO_ISO15693_MASK)
|
|
ddev->protocols |= NFC_PROTO_ISO15693_MASK;
|
|
if (supported_protocols & NFC_PROTO_ISO14443_MASK)
|
|
ddev->protocols |= NFC_PROTO_ISO14443_MASK;
|
|
if (supported_protocols & NFC_PROTO_ISO14443_B_MASK)
|
|
ddev->protocols |= NFC_PROTO_ISO14443_B_MASK;
|
|
|
|
ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
|
|
ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
|
|
|
|
ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
|
|
ddev->tx_headroom,
|
|
ddev->tx_tailroom);
|
|
if (!ddev->nfc_dev) {
|
|
pr_err("nfc_allocate_device failed\n");
|
|
goto free_dev;
|
|
}
|
|
|
|
nfc_set_drvdata(ddev->nfc_dev, ddev);
|
|
|
|
return ddev;
|
|
|
|
free_dev:
|
|
kfree(ddev);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(nfc_digital_allocate_device);
|
|
|
|
void nfc_digital_free_device(struct nfc_digital_dev *ddev)
|
|
{
|
|
nfc_free_device(ddev->nfc_dev);
|
|
kfree(ddev);
|
|
}
|
|
EXPORT_SYMBOL(nfc_digital_free_device);
|
|
|
|
int nfc_digital_register_device(struct nfc_digital_dev *ddev)
|
|
{
|
|
return nfc_register_device(ddev->nfc_dev);
|
|
}
|
|
EXPORT_SYMBOL(nfc_digital_register_device);
|
|
|
|
void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
|
|
{
|
|
struct digital_cmd *cmd, *n;
|
|
|
|
nfc_unregister_device(ddev->nfc_dev);
|
|
|
|
mutex_lock(&ddev->poll_lock);
|
|
ddev->poll_tech_count = 0;
|
|
mutex_unlock(&ddev->poll_lock);
|
|
|
|
cancel_delayed_work_sync(&ddev->poll_work);
|
|
cancel_work_sync(&ddev->cmd_work);
|
|
cancel_work_sync(&ddev->cmd_complete_work);
|
|
|
|
list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
|
|
list_del(&cmd->queue);
|
|
|
|
/* Call the command callback if any and pass it a ENODEV error.
|
|
* This gives a chance to the command issuer to free any
|
|
* allocated buffer.
|
|
*/
|
|
if (cmd->cmd_cb)
|
|
cmd->cmd_cb(ddev, cmd->cb_context, ERR_PTR(-ENODEV));
|
|
|
|
kfree(cmd->mdaa_params);
|
|
kfree(cmd);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(nfc_digital_unregister_device);
|
|
|
|
MODULE_LICENSE("GPL");
|