NFC: nfcsim: Make use of the Digital layer
With this complete rewrite, the loopback nfcsim driver now relies on the Digital layer of the nfc stack. As with the previous version, 2 nfc devices are declared when the driver is initialized. The driver supports the NFC_DEP protocol in NFC-A and NFC-F technologies. The 2 devices are using a pair of virtual links for sk_buff exchange. The out-link of one device is the in-link of the other and conversely. To receive data, a device calls nfcsim_link_recv_skb() on its in-link and waits for incoming data on a wait queue. To send data, a device calls nfcsim_link_send_skb() on its out-link which stores the passed skb and signals its wait queue. If the peer device was in the nfcsim_link_recv_skb() call, it will be signaled and will be able to pass the received sk_buff up to the Digital layer. Signed-off-by: Thierry Escande <thierry.escande@collabora.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Escande
Samuel Ortiz
Родитель
806bfe31c9
Коммит
204bddcb50
|
|
@ -18,523 +18,427 @@
|
|||
#include <linux/module.h>
|
||||
#include <linux/nfc.h>
|
||||
#include <net/nfc/nfc.h>
|
||||
#include <net/nfc/digital.h>
|
||||
|
||||
#define DEV_ERR(_dev, fmt, args...) nfc_err(&_dev->nfc_dev->dev, \
|
||||
"%s: " fmt, __func__, ## args)
|
||||
#define NFCSIM_ERR(d, fmt, args...) nfc_err(&d->nfc_digital_dev->nfc_dev->dev, \
|
||||
"%s: " fmt, __func__, ## args)
|
||||
|
||||
#define DEV_DBG(_dev, fmt, args...) dev_dbg(&_dev->nfc_dev->dev, \
|
||||
"%s: " fmt, __func__, ## args)
|
||||
#define NFCSIM_DBG(d, fmt, args...) dev_dbg(&d->nfc_digital_dev->nfc_dev->dev, \
|
||||
"%s: " fmt, __func__, ## args)
|
||||
|
||||
#define NFCSIM_VERSION "0.1"
|
||||
#define NFCSIM_VERSION "0.2"
|
||||
|
||||
#define NFCSIM_POLL_NONE 0
|
||||
#define NFCSIM_POLL_INITIATOR 1
|
||||
#define NFCSIM_POLL_TARGET 2
|
||||
#define NFCSIM_POLL_DUAL (NFCSIM_POLL_INITIATOR | NFCSIM_POLL_TARGET)
|
||||
#define NFCSIM_MODE_NONE 0
|
||||
#define NFCSIM_MODE_INITIATOR 1
|
||||
#define NFCSIM_MODE_TARGET 2
|
||||
|
||||
#define RX_DEFAULT_DELAY 5
|
||||
#define NFCSIM_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC | \
|
||||
NFC_DIGITAL_DRV_CAPS_TG_CRC)
|
||||
|
||||
struct nfcsim {
|
||||
struct nfc_dev *nfc_dev;
|
||||
struct nfc_digital_dev *nfc_digital_dev;
|
||||
|
||||
struct work_struct recv_work;
|
||||
struct delayed_work send_work;
|
||||
|
||||
struct nfcsim_link *link_in;
|
||||
struct nfcsim_link *link_out;
|
||||
|
||||
bool up;
|
||||
u8 mode;
|
||||
u8 rf_tech;
|
||||
|
||||
u16 recv_timeout;
|
||||
|
||||
nfc_digital_cmd_complete_t cb;
|
||||
void *arg;
|
||||
};
|
||||
|
||||
struct nfcsim_link {
|
||||
struct mutex lock;
|
||||
|
||||
struct delayed_work recv_work;
|
||||
u8 rf_tech;
|
||||
u8 mode;
|
||||
|
||||
struct sk_buff *clone_skb;
|
||||
u8 shutdown;
|
||||
|
||||
struct delayed_work poll_work;
|
||||
u8 polling_mode;
|
||||
u8 curr_polling_mode;
|
||||
|
||||
u8 shutting_down;
|
||||
|
||||
u8 up;
|
||||
|
||||
u8 initiator;
|
||||
|
||||
u32 rx_delay;
|
||||
|
||||
data_exchange_cb_t cb;
|
||||
void *cb_context;
|
||||
|
||||
struct nfcsim *peer_dev;
|
||||
struct sk_buff *skb;
|
||||
wait_queue_head_t recv_wait;
|
||||
u8 cond;
|
||||
};
|
||||
|
||||
static struct nfcsim_link *nfcsim_link_new(void)
|
||||
{
|
||||
struct nfcsim_link *link;
|
||||
|
||||
link = kzalloc(sizeof(struct nfcsim_link), GFP_KERNEL);
|
||||
if (!link)
|
||||
return NULL;
|
||||
|
||||
mutex_init(&link->lock);
|
||||
init_waitqueue_head(&link->recv_wait);
|
||||
|
||||
return link;
|
||||
}
|
||||
|
||||
static void nfcsim_link_free(struct nfcsim_link *link)
|
||||
{
|
||||
dev_kfree_skb(link->skb);
|
||||
kfree(link);
|
||||
}
|
||||
|
||||
static void nfcsim_link_recv_wake(struct nfcsim_link *link)
|
||||
{
|
||||
link->cond = 1;
|
||||
wake_up_interruptible(&link->recv_wait);
|
||||
}
|
||||
|
||||
static void nfcsim_link_set_skb(struct nfcsim_link *link, struct sk_buff *skb,
|
||||
u8 rf_tech, u8 mode)
|
||||
{
|
||||
mutex_lock(&link->lock);
|
||||
|
||||
dev_kfree_skb(link->skb);
|
||||
link->skb = skb;
|
||||
link->rf_tech = rf_tech;
|
||||
link->mode = mode;
|
||||
|
||||
mutex_unlock(&link->lock);
|
||||
}
|
||||
|
||||
static void nfcsim_link_recv_cancel(struct nfcsim_link *link)
|
||||
{
|
||||
mutex_lock(&link->lock);
|
||||
|
||||
link->mode = NFCSIM_MODE_NONE;
|
||||
|
||||
mutex_unlock(&link->lock);
|
||||
|
||||
nfcsim_link_recv_wake(link);
|
||||
}
|
||||
|
||||
static void nfcsim_link_shutdown(struct nfcsim_link *link)
|
||||
{
|
||||
mutex_lock(&link->lock);
|
||||
|
||||
link->shutdown = 1;
|
||||
link->mode = NFCSIM_MODE_NONE;
|
||||
|
||||
mutex_unlock(&link->lock);
|
||||
|
||||
nfcsim_link_recv_wake(link);
|
||||
}
|
||||
|
||||
static struct sk_buff *nfcsim_link_recv_skb(struct nfcsim_link *link,
|
||||
int timeout, u8 rf_tech, u8 mode)
|
||||
{
|
||||
int rc;
|
||||
struct sk_buff *skb;
|
||||
|
||||
rc = wait_event_interruptible_timeout(link->recv_wait,
|
||||
link->cond,
|
||||
msecs_to_jiffies(timeout));
|
||||
|
||||
mutex_lock(&link->lock);
|
||||
|
||||
skb = link->skb;
|
||||
link->skb = NULL;
|
||||
|
||||
if (!rc) {
|
||||
rc = -ETIMEDOUT;
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (!skb || link->rf_tech != rf_tech || link->mode == mode) {
|
||||
rc = -EINVAL;
|
||||
goto done;
|
||||
}
|
||||
|
||||
if (link->shutdown) {
|
||||
rc = -ENODEV;
|
||||
goto done;
|
||||
}
|
||||
|
||||
done:
|
||||
mutex_unlock(&link->lock);
|
||||
|
||||
if (rc < 0) {
|
||||
dev_kfree_skb(skb);
|
||||
skb = ERR_PTR(rc);
|
||||
}
|
||||
|
||||
link->cond = 0;
|
||||
|
||||
return skb;
|
||||
}
|
||||
|
||||
static void nfcsim_send_wq(struct work_struct *work)
|
||||
{
|
||||
struct nfcsim *dev = container_of(work, struct nfcsim, send_work.work);
|
||||
|
||||
/*
|
||||
* To effectively send data, the device just wake up its link_out which
|
||||
* is the link_in of the peer device. The exchanged skb has already been
|
||||
* stored in the dev->link_out through nfcsim_link_set_skb().
|
||||
*/
|
||||
nfcsim_link_recv_wake(dev->link_out);
|
||||
}
|
||||
|
||||
static void nfcsim_recv_wq(struct work_struct *work)
|
||||
{
|
||||
struct nfcsim *dev = container_of(work, struct nfcsim, recv_work);
|
||||
struct sk_buff *skb;
|
||||
|
||||
skb = nfcsim_link_recv_skb(dev->link_in, dev->recv_timeout,
|
||||
dev->rf_tech, dev->mode);
|
||||
|
||||
if (!dev->up) {
|
||||
NFCSIM_ERR(dev, "Device is down\n");
|
||||
|
||||
if (!IS_ERR(skb))
|
||||
dev_kfree_skb(skb);
|
||||
|
||||
skb = ERR_PTR(-ENODEV);
|
||||
}
|
||||
|
||||
dev->cb(dev->nfc_digital_dev, dev->arg, skb);
|
||||
}
|
||||
|
||||
static int nfcsim_send(struct nfc_digital_dev *ddev, struct sk_buff *skb,
|
||||
u16 timeout, nfc_digital_cmd_complete_t cb, void *arg)
|
||||
{
|
||||
struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
|
||||
u8 delay;
|
||||
|
||||
if (!dev->up) {
|
||||
NFCSIM_ERR(dev, "Device is down\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
dev->recv_timeout = timeout;
|
||||
dev->cb = cb;
|
||||
dev->arg = arg;
|
||||
|
||||
schedule_work(&dev->recv_work);
|
||||
|
||||
if (skb) {
|
||||
nfcsim_link_set_skb(dev->link_out, skb, dev->rf_tech,
|
||||
dev->mode);
|
||||
|
||||
/* Add random delay (between 3 and 10 ms) before sending data */
|
||||
get_random_bytes(&delay, 1);
|
||||
delay = 3 + (delay & 0x07);
|
||||
|
||||
schedule_delayed_work(&dev->send_work, msecs_to_jiffies(delay));
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void nfcsim_abort_cmd(struct nfc_digital_dev *ddev)
|
||||
{
|
||||
struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
|
||||
|
||||
nfcsim_link_recv_cancel(dev->link_in);
|
||||
}
|
||||
|
||||
static int nfcsim_switch_rf(struct nfc_digital_dev *ddev, bool on)
|
||||
{
|
||||
struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
|
||||
|
||||
dev->up = on;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcsim_in_configure_hw(struct nfc_digital_dev *ddev,
|
||||
int type, int param)
|
||||
{
|
||||
struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
|
||||
|
||||
switch (type) {
|
||||
case NFC_DIGITAL_CONFIG_RF_TECH:
|
||||
dev->up = true;
|
||||
dev->mode = NFCSIM_MODE_INITIATOR;
|
||||
dev->rf_tech = param;
|
||||
break;
|
||||
|
||||
case NFC_DIGITAL_CONFIG_FRAMING:
|
||||
break;
|
||||
|
||||
default:
|
||||
NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcsim_in_send_cmd(struct nfc_digital_dev *ddev,
|
||||
struct sk_buff *skb, u16 timeout,
|
||||
nfc_digital_cmd_complete_t cb, void *arg)
|
||||
{
|
||||
return nfcsim_send(ddev, skb, timeout, cb, arg);
|
||||
}
|
||||
|
||||
static int nfcsim_tg_configure_hw(struct nfc_digital_dev *ddev,
|
||||
int type, int param)
|
||||
{
|
||||
struct nfcsim *dev = nfc_digital_get_drvdata(ddev);
|
||||
|
||||
switch (type) {
|
||||
case NFC_DIGITAL_CONFIG_RF_TECH:
|
||||
dev->up = true;
|
||||
dev->mode = NFCSIM_MODE_TARGET;
|
||||
dev->rf_tech = param;
|
||||
break;
|
||||
|
||||
case NFC_DIGITAL_CONFIG_FRAMING:
|
||||
break;
|
||||
|
||||
default:
|
||||
NFCSIM_ERR(dev, "Invalid configuration type: %d\n", type);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcsim_tg_send_cmd(struct nfc_digital_dev *ddev,
|
||||
struct sk_buff *skb, u16 timeout,
|
||||
nfc_digital_cmd_complete_t cb, void *arg)
|
||||
{
|
||||
return nfcsim_send(ddev, skb, timeout, cb, arg);
|
||||
}
|
||||
|
||||
static int nfcsim_tg_listen(struct nfc_digital_dev *ddev, u16 timeout,
|
||||
nfc_digital_cmd_complete_t cb, void *arg)
|
||||
{
|
||||
return nfcsim_send(ddev, NULL, timeout, cb, arg);
|
||||
}
|
||||
|
||||
static struct nfc_digital_ops nfcsim_digital_ops = {
|
||||
.in_configure_hw = nfcsim_in_configure_hw,
|
||||
.in_send_cmd = nfcsim_in_send_cmd,
|
||||
|
||||
.tg_listen = nfcsim_tg_listen,
|
||||
.tg_configure_hw = nfcsim_tg_configure_hw,
|
||||
.tg_send_cmd = nfcsim_tg_send_cmd,
|
||||
|
||||
.abort_cmd = nfcsim_abort_cmd,
|
||||
.switch_rf = nfcsim_switch_rf,
|
||||
};
|
||||
|
||||
static struct nfcsim *nfcsim_device_new(struct nfcsim_link *link_in,
|
||||
struct nfcsim_link *link_out)
|
||||
{
|
||||
struct nfcsim *dev;
|
||||
int rc;
|
||||
|
||||
dev = kzalloc(sizeof(struct nfcsim), GFP_KERNEL);
|
||||
if (!dev)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
INIT_DELAYED_WORK(&dev->send_work, nfcsim_send_wq);
|
||||
INIT_WORK(&dev->recv_work, nfcsim_recv_wq);
|
||||
|
||||
dev->nfc_digital_dev =
|
||||
nfc_digital_allocate_device(&nfcsim_digital_ops,
|
||||
NFC_PROTO_NFC_DEP_MASK,
|
||||
NFCSIM_CAPABILITIES,
|
||||
0, 0);
|
||||
if (!dev->nfc_digital_dev) {
|
||||
kfree(dev);
|
||||
return ERR_PTR(-ENOMEM);
|
||||
}
|
||||
|
||||
nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
|
||||
|
||||
dev->link_in = link_in;
|
||||
dev->link_out = link_out;
|
||||
|
||||
rc = nfc_digital_register_device(dev->nfc_digital_dev);
|
||||
if (rc) {
|
||||
pr_err("Could not register digital device (%d)\n", rc);
|
||||
nfc_digital_free_device(dev->nfc_digital_dev);
|
||||
kfree(dev);
|
||||
|
||||
return ERR_PTR(rc);
|
||||
}
|
||||
|
||||
return dev;
|
||||
}
|
||||
|
||||
static void nfcsim_device_free(struct nfcsim *dev)
|
||||
{
|
||||
nfc_digital_unregister_device(dev->nfc_digital_dev);
|
||||
|
||||
dev->up = false;
|
||||
|
||||
nfcsim_link_shutdown(dev->link_in);
|
||||
|
||||
cancel_delayed_work_sync(&dev->send_work);
|
||||
cancel_work_sync(&dev->recv_work);
|
||||
|
||||
nfc_digital_free_device(dev->nfc_digital_dev);
|
||||
|
||||
kfree(dev);
|
||||
}
|
||||
|
||||
static struct nfcsim *dev0;
|
||||
static struct nfcsim *dev1;
|
||||
|
||||
static struct workqueue_struct *wq;
|
||||
|
||||
static void nfcsim_cleanup_dev(struct nfcsim *dev, u8 shutdown)
|
||||
{
|
||||
DEV_DBG(dev, "shutdown=%d\n", shutdown);
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
dev->polling_mode = NFCSIM_POLL_NONE;
|
||||
dev->shutting_down = shutdown;
|
||||
dev->cb = NULL;
|
||||
dev_kfree_skb(dev->clone_skb);
|
||||
dev->clone_skb = NULL;
|
||||
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
cancel_delayed_work_sync(&dev->poll_work);
|
||||
cancel_delayed_work_sync(&dev->recv_work);
|
||||
}
|
||||
|
||||
static int nfcsim_target_found(struct nfcsim *dev)
|
||||
{
|
||||
struct nfc_target nfc_tgt;
|
||||
|
||||
DEV_DBG(dev, "\n");
|
||||
|
||||
memset(&nfc_tgt, 0, sizeof(struct nfc_target));
|
||||
|
||||
nfc_tgt.supported_protocols = NFC_PROTO_NFC_DEP_MASK;
|
||||
nfc_targets_found(dev->nfc_dev, &nfc_tgt, 1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcsim_dev_up(struct nfc_dev *nfc_dev)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
|
||||
DEV_DBG(dev, "\n");
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
dev->up = 1;
|
||||
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcsim_dev_down(struct nfc_dev *nfc_dev)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
|
||||
DEV_DBG(dev, "\n");
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
dev->up = 0;
|
||||
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcsim_dep_link_up(struct nfc_dev *nfc_dev,
|
||||
struct nfc_target *target,
|
||||
u8 comm_mode, u8 *gb, size_t gb_len)
|
||||
{
|
||||
int rc;
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
struct nfcsim *peer = dev->peer_dev;
|
||||
u8 *remote_gb;
|
||||
size_t remote_gb_len;
|
||||
|
||||
DEV_DBG(dev, "target_idx: %d, comm_mode: %d\n", target->idx, comm_mode);
|
||||
|
||||
mutex_lock(&peer->lock);
|
||||
|
||||
nfc_tm_activated(peer->nfc_dev, NFC_PROTO_NFC_DEP_MASK,
|
||||
NFC_COMM_ACTIVE, gb, gb_len);
|
||||
|
||||
remote_gb = nfc_get_local_general_bytes(peer->nfc_dev, &remote_gb_len);
|
||||
if (!remote_gb) {
|
||||
DEV_ERR(peer, "Can't get remote general bytes\n");
|
||||
|
||||
mutex_unlock(&peer->lock);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
mutex_unlock(&peer->lock);
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
rc = nfc_set_remote_general_bytes(nfc_dev, remote_gb, remote_gb_len);
|
||||
if (rc) {
|
||||
DEV_ERR(dev, "Can't set remote general bytes\n");
|
||||
mutex_unlock(&dev->lock);
|
||||
return rc;
|
||||
}
|
||||
|
||||
rc = nfc_dep_link_is_up(nfc_dev, target->idx, NFC_COMM_ACTIVE,
|
||||
NFC_RF_INITIATOR);
|
||||
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int nfcsim_dep_link_down(struct nfc_dev *nfc_dev)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
|
||||
DEV_DBG(dev, "\n");
|
||||
|
||||
nfcsim_cleanup_dev(dev, 0);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nfcsim_start_poll(struct nfc_dev *nfc_dev,
|
||||
u32 im_protocols, u32 tm_protocols)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
int rc;
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
if (dev->polling_mode != NFCSIM_POLL_NONE) {
|
||||
DEV_ERR(dev, "Already in polling mode\n");
|
||||
rc = -EBUSY;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (im_protocols & NFC_PROTO_NFC_DEP_MASK)
|
||||
dev->polling_mode |= NFCSIM_POLL_INITIATOR;
|
||||
|
||||
if (tm_protocols & NFC_PROTO_NFC_DEP_MASK)
|
||||
dev->polling_mode |= NFCSIM_POLL_TARGET;
|
||||
|
||||
if (dev->polling_mode == NFCSIM_POLL_NONE) {
|
||||
DEV_ERR(dev, "Unsupported polling mode\n");
|
||||
rc = -EINVAL;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
dev->initiator = 0;
|
||||
dev->curr_polling_mode = NFCSIM_POLL_NONE;
|
||||
|
||||
queue_delayed_work(wq, &dev->poll_work, 0);
|
||||
|
||||
DEV_DBG(dev, "Start polling: im: 0x%X, tm: 0x%X\n", im_protocols,
|
||||
tm_protocols);
|
||||
|
||||
rc = 0;
|
||||
exit:
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void nfcsim_stop_poll(struct nfc_dev *nfc_dev)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
|
||||
DEV_DBG(dev, "Stop poll\n");
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
dev->polling_mode = NFCSIM_POLL_NONE;
|
||||
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
cancel_delayed_work_sync(&dev->poll_work);
|
||||
}
|
||||
|
||||
static int nfcsim_activate_target(struct nfc_dev *nfc_dev,
|
||||
struct nfc_target *target, u32 protocol)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
|
||||
DEV_DBG(dev, "\n");
|
||||
|
||||
return -ENOTSUPP;
|
||||
}
|
||||
|
||||
static void nfcsim_deactivate_target(struct nfc_dev *nfc_dev,
|
||||
struct nfc_target *target, u8 mode)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
|
||||
DEV_DBG(dev, "\n");
|
||||
}
|
||||
|
||||
static void nfcsim_wq_recv(struct work_struct *work)
|
||||
{
|
||||
struct nfcsim *dev = container_of(work, struct nfcsim,
|
||||
recv_work.work);
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
if (dev->shutting_down || !dev->up || !dev->clone_skb) {
|
||||
dev_kfree_skb(dev->clone_skb);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
if (dev->initiator) {
|
||||
if (!dev->cb) {
|
||||
DEV_ERR(dev, "Null recv callback\n");
|
||||
dev_kfree_skb(dev->clone_skb);
|
||||
goto exit;
|
||||
}
|
||||
|
||||
dev->cb(dev->cb_context, dev->clone_skb, 0);
|
||||
dev->cb = NULL;
|
||||
} else {
|
||||
nfc_tm_data_received(dev->nfc_dev, dev->clone_skb);
|
||||
}
|
||||
|
||||
exit:
|
||||
dev->clone_skb = NULL;
|
||||
|
||||
mutex_unlock(&dev->lock);
|
||||
}
|
||||
|
||||
static int nfcsim_tx(struct nfc_dev *nfc_dev, struct nfc_target *target,
|
||||
struct sk_buff *skb, data_exchange_cb_t cb,
|
||||
void *cb_context)
|
||||
{
|
||||
struct nfcsim *dev = nfc_get_drvdata(nfc_dev);
|
||||
struct nfcsim *peer = dev->peer_dev;
|
||||
int err;
|
||||
|
||||
mutex_lock(&dev->lock);
|
||||
|
||||
if (dev->shutting_down || !dev->up) {
|
||||
mutex_unlock(&dev->lock);
|
||||
err = -ENODEV;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
dev->cb = cb;
|
||||
dev->cb_context = cb_context;
|
||||
|
||||
mutex_unlock(&dev->lock);
|
||||
|
||||
mutex_lock(&peer->lock);
|
||||
|
||||
peer->clone_skb = skb_clone(skb, GFP_KERNEL);
|
||||
|
||||
if (!peer->clone_skb) {
|
||||
DEV_ERR(dev, "skb_clone failed\n");
|
||||
mutex_unlock(&peer->lock);
|
||||
err = -ENOMEM;
|
||||
goto exit;
|
||||
}
|
||||
|
||||
/* This simulates an arbitrary transmission delay between the 2 devices.
|
||||
* If packet transmission occurs immediately between them, we have a
|
||||
* non-stop flow of several tens of thousands SYMM packets per second
|
||||
* and a burning cpu.
|
||||
*/
|
||||
queue_delayed_work(wq, &peer->recv_work,
|
||||
msecs_to_jiffies(dev->rx_delay));
|
||||
|
||||
mutex_unlock(&peer->lock);
|
||||
|
||||
err = 0;
|
||||
exit:
|
||||
dev_kfree_skb(skb);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int nfcsim_im_transceive(struct nfc_dev *nfc_dev,
|
||||
struct nfc_target *target, struct sk_buff *skb,
|
||||
data_exchange_cb_t cb, void *cb_context)
|
||||
{
|
||||
return nfcsim_tx(nfc_dev, target, skb, cb, cb_context);
|
||||
}
|
||||
|
||||
static int nfcsim_tm_send(struct nfc_dev *nfc_dev, struct sk_buff *skb)
|
||||
{
|
||||
return nfcsim_tx(nfc_dev, NULL, skb, NULL, NULL);
|
||||
}
|
||||
|
||||
static struct nfc_ops nfcsim_nfc_ops = {
|
||||
.dev_up = nfcsim_dev_up,
|
||||
.dev_down = nfcsim_dev_down,
|
||||
.dep_link_up = nfcsim_dep_link_up,
|
||||
.dep_link_down = nfcsim_dep_link_down,
|
||||
.start_poll = nfcsim_start_poll,
|
||||
.stop_poll = nfcsim_stop_poll,
|
||||
.activate_target = nfcsim_activate_target,
|
||||
.deactivate_target = nfcsim_deactivate_target,
|
||||
.im_transceive = nfcsim_im_transceive,
|
||||
.tm_send = nfcsim_tm_send,
|
||||
};
|
||||
|
||||
static void nfcsim_set_polling_mode(struct nfcsim *dev)
|
||||
{
|
||||
if (dev->polling_mode == NFCSIM_POLL_NONE) {
|
||||
dev->curr_polling_mode = NFCSIM_POLL_NONE;
|
||||
return;
|
||||
}
|
||||
|
||||
if (dev->curr_polling_mode == NFCSIM_POLL_NONE) {
|
||||
if (dev->polling_mode & NFCSIM_POLL_INITIATOR)
|
||||
dev->curr_polling_mode = NFCSIM_POLL_INITIATOR;
|
||||
else
|
||||
dev->curr_polling_mode = NFCSIM_POLL_TARGET;
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
if (dev->polling_mode == NFCSIM_POLL_DUAL) {
|
||||
if (dev->curr_polling_mode == NFCSIM_POLL_TARGET)
|
||||
dev->curr_polling_mode = NFCSIM_POLL_INITIATOR;
|
||||
else
|
||||
dev->curr_polling_mode = NFCSIM_POLL_TARGET;
|
||||
}
|
||||
}
|
||||
|
||||
static void nfcsim_wq_poll(struct work_struct *work)
|
||||
{
|
||||
struct nfcsim *dev = container_of(work, struct nfcsim, poll_work.work);
|
||||
struct nfcsim *peer = dev->peer_dev;
|
||||
|
||||
/* These work items run on an ordered workqueue and are therefore
|
||||
* serialized. So we can take both mutexes without being dead locked.
|
||||
*/
|
||||
mutex_lock(&dev->lock);
|
||||
mutex_lock(&peer->lock);
|
||||
|
||||
nfcsim_set_polling_mode(dev);
|
||||
|
||||
if (dev->curr_polling_mode == NFCSIM_POLL_NONE) {
|
||||
DEV_DBG(dev, "Not polling\n");
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
DEV_DBG(dev, "Polling as %s",
|
||||
dev->curr_polling_mode == NFCSIM_POLL_INITIATOR ?
|
||||
"initiator\n" : "target\n");
|
||||
|
||||
if (dev->curr_polling_mode == NFCSIM_POLL_TARGET)
|
||||
goto sched_work;
|
||||
|
||||
if (peer->curr_polling_mode == NFCSIM_POLL_TARGET) {
|
||||
peer->polling_mode = NFCSIM_POLL_NONE;
|
||||
dev->polling_mode = NFCSIM_POLL_NONE;
|
||||
|
||||
dev->initiator = 1;
|
||||
|
||||
nfcsim_target_found(dev);
|
||||
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
sched_work:
|
||||
/* This defines the delay for an initiator to check if the other device
|
||||
* is polling in target mode.
|
||||
* If the device starts in dual mode polling, it switches between
|
||||
* initiator and target at every round.
|
||||
* Because the wq is ordered and only 1 work item is executed at a time,
|
||||
* we'll always have one device polling as initiator and the other as
|
||||
* target at some point, even if both are started in dual mode.
|
||||
*/
|
||||
queue_delayed_work(wq, &dev->poll_work, msecs_to_jiffies(200));
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&peer->lock);
|
||||
mutex_unlock(&dev->lock);
|
||||
}
|
||||
|
||||
static struct nfcsim *nfcsim_init_dev(void)
|
||||
{
|
||||
struct nfcsim *dev;
|
||||
int rc = -ENOMEM;
|
||||
|
||||
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
||||
if (dev == NULL)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
mutex_init(&dev->lock);
|
||||
|
||||
INIT_DELAYED_WORK(&dev->recv_work, nfcsim_wq_recv);
|
||||
INIT_DELAYED_WORK(&dev->poll_work, nfcsim_wq_poll);
|
||||
|
||||
dev->nfc_dev = nfc_allocate_device(&nfcsim_nfc_ops,
|
||||
NFC_PROTO_NFC_DEP_MASK,
|
||||
0, 0);
|
||||
if (!dev->nfc_dev)
|
||||
goto error;
|
||||
|
||||
nfc_set_drvdata(dev->nfc_dev, dev);
|
||||
|
||||
rc = nfc_register_device(dev->nfc_dev);
|
||||
if (rc)
|
||||
goto free_nfc_dev;
|
||||
|
||||
dev->rx_delay = RX_DEFAULT_DELAY;
|
||||
return dev;
|
||||
|
||||
free_nfc_dev:
|
||||
nfc_free_device(dev->nfc_dev);
|
||||
|
||||
error:
|
||||
kfree(dev);
|
||||
|
||||
return ERR_PTR(rc);
|
||||
}
|
||||
|
||||
static void nfcsim_free_device(struct nfcsim *dev)
|
||||
{
|
||||
nfc_unregister_device(dev->nfc_dev);
|
||||
|
||||
nfc_free_device(dev->nfc_dev);
|
||||
|
||||
kfree(dev);
|
||||
}
|
||||
|
||||
static int __init nfcsim_init(void)
|
||||
{
|
||||
struct nfcsim_link *link0, *link1;
|
||||
int rc;
|
||||
|
||||
/* We need an ordered wq to ensure that poll_work items are executed
|
||||
* one at a time.
|
||||
*/
|
||||
wq = alloc_ordered_workqueue("nfcsim", 0);
|
||||
if (!wq) {
|
||||
link0 = nfcsim_link_new();
|
||||
link1 = nfcsim_link_new();
|
||||
if (!link0 || !link1) {
|
||||
rc = -ENOMEM;
|
||||
goto exit;
|
||||
goto exit_err;
|
||||
}
|
||||
|
||||
dev0 = nfcsim_init_dev();
|
||||
dev0 = nfcsim_device_new(link0, link1);
|
||||
if (IS_ERR(dev0)) {
|
||||
rc = PTR_ERR(dev0);
|
||||
goto exit;
|
||||
goto exit_err;
|
||||
}
|
||||
|
||||
dev1 = nfcsim_init_dev();
|
||||
dev1 = nfcsim_device_new(link1, link0);
|
||||
if (IS_ERR(dev1)) {
|
||||
kfree(dev0);
|
||||
nfcsim_device_free(dev0);
|
||||
|
||||
rc = PTR_ERR(dev1);
|
||||
goto exit;
|
||||
goto exit_err;
|
||||
}
|
||||
|
||||
dev0->peer_dev = dev1;
|
||||
dev1->peer_dev = dev0;
|
||||
pr_info("nfcsim " NFCSIM_VERSION " initialized\n");
|
||||
|
||||
pr_debug("NFCsim " NFCSIM_VERSION " initialized\n");
|
||||
return 0;
|
||||
|
||||
rc = 0;
|
||||
exit:
|
||||
if (rc)
|
||||
pr_err("Failed to initialize nfcsim driver (%d)\n",
|
||||
rc);
|
||||
exit_err:
|
||||
pr_err("Failed to initialize nfcsim driver (%d)\n", rc);
|
||||
|
||||
nfcsim_link_free(link0);
|
||||
nfcsim_link_free(link1);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void __exit nfcsim_exit(void)
|
||||
{
|
||||
nfcsim_cleanup_dev(dev0, 1);
|
||||
nfcsim_cleanup_dev(dev1, 1);
|
||||
struct nfcsim_link *link0, *link1;
|
||||
|
||||
nfcsim_free_device(dev0);
|
||||
nfcsim_free_device(dev1);
|
||||
link0 = dev0->link_in;
|
||||
link1 = dev0->link_out;
|
||||
|
||||
destroy_workqueue(wq);
|
||||
nfcsim_device_free(dev0);
|
||||
nfcsim_device_free(dev1);
|
||||
|
||||
nfcsim_link_free(link0);
|
||||
nfcsim_link_free(link1);
|
||||
}
|
||||
|
||||
module_init(nfcsim_init);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче