Revision 504fd6a5390c30b1b7670768e314dd5d473da06a authored by Shay Agroskin on 08 June 2021, 16:42:54 UTC, committed by David S. Miller on 08 June 2021, 23:41:02 UTC
This patch fixes several bugs found when (DMA/LLQ) mapping a packet for
transmission. The mapping procedure makes the transmitted packet
accessible by the device.
When using LLQ, this requires copying the packet's header to push header
(which would be passed to LLQ) and creating DMA mapping for the payload
(if the packet doesn't fit the maximum push length).
When not using LLQ, we map the whole packet with DMA.
The following bugs are fixed in the code:
1. Add support for non-LLQ machines:
The ena_xdp_tx_map_frame() function assumed that LLQ is
supported, and never mapped the whole packet using DMA. On some
instances, which don't support LLQ, this causes loss of traffic.
2. Wrong DMA buffer length passed to device:
When using LLQ, the first 'tx_max_header_size' bytes of the
packet would be copied to push header. The rest of the packet
would be copied to a DMA'd buffer.
3. Freeing the XDP buffer twice in case of a mapping error:
In case a buffer DMA mapping fails, the function uses
xdp_return_frame_rx_napi() to free the RX buffer and returns from
the function with an error. XDP frames that fail to xmit get
freed by the kernel and so there is no need for this call.
Fixes: 548c4940b9f1 ("net: ena: Implement XDP_TX action")
Signed-off-by: Shay Agroskin <shayagr@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 1650bdb
digital_core.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;
}
/**
* digital_start_poll - start_poll operation
* @nfc_dev: device to be polled
* @im_protocols: bitset of nfc initiator protocols to be used for polling
* @tm_protocols: bitset of nfc transport protocols to be used for polling
*
* 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");
Computing file changes ...
