Commit 9e2d493e authored by Waldemar Rymarkiewicz's avatar Waldemar Rymarkiewicz Committed by Samuel Ortiz

NFC: pn533: Introduce ops for frame logic

Encapsulate whole frame logic (tx/rx frame structure and size) inside
the ops structure to make the core driver generic for devices which
handle frames in non standard menner (different then pn533 spec say).
Signed-off-by: default avatarWaldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 16f75419
......@@ -79,9 +79,6 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_LISTEN_TIME 2
/* frame definitions */
#define PN533_NORMAL_FRAME_MAX_LEN 262 /* 6 (PREAMBLE, SOF, LEN, LCS, TFI)
254 (DATA)
2 (DCS, postamble) */
#define PN533_FRAME_HEADER_LEN (sizeof(struct pn533_frame) \
+ 2) /* data[0] TFI, data[1] CC */
#define PN533_FRAME_TAIL_LEN 2 /* data[len] DCS, data[len + 1] postamble*/
......@@ -92,8 +89,6 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
*/
#define PN533_FRAME_MAX_PAYLOAD_LEN 263
#define PN533_FRAME_SIZE(f) (sizeof(struct pn533_frame) + f->datalen + \
PN533_FRAME_TAIL_LEN)
#define PN533_FRAME_ACK_SIZE 6 /* Preamble (1), SoPC (2), ACK Code (2),
Postamble (1) */
#define PN533_FRAME_CHECKSUM(f) (f->data[f->datalen])
......@@ -361,6 +356,8 @@ struct pn533 {
struct list_head cmd_queue;
u8 cmd_pending;
struct pn533_frame_ops *ops;
};
struct pn533_cmd {
......@@ -368,6 +365,7 @@ struct pn533_cmd {
u8 cmd_code;
struct sk_buff *req;
struct sk_buff *resp;
int resp_len;
void *arg;
};
......@@ -379,6 +377,22 @@ struct pn533_frame {
u8 data[];
} __packed;
struct pn533_frame_ops {
void (*tx_frame_init)(void *frame, u8 cmd_code);
void (*tx_frame_finish)(void *frame);
void (*tx_update_payload_len)(void *frame, int len);
int tx_header_len;
int tx_tail_len;
bool (*rx_is_frame_valid)(void *frame);
int (*rx_frame_size)(void *frame);
int rx_header_len;
int rx_tail_len;
int max_payload_len;
u8 (*get_cmd_code)(void *frame);
};
/* The rule: value + checksum = 0 */
static inline u8 pn533_checksum(u8 value)
{
......@@ -397,17 +411,21 @@ static u8 pn533_data_checksum(u8 *data, int datalen)
return pn533_checksum(sum);
}
static void pn533_tx_frame_init(struct pn533_frame *frame, u8 cmd)
static void pn533_tx_frame_init(void *_frame, u8 cmd_code)
{
struct pn533_frame *frame = _frame;
frame->preamble = 0;
frame->start_frame = cpu_to_be16(PN533_SOF);
PN533_FRAME_IDENTIFIER(frame) = PN533_DIR_OUT;
PN533_FRAME_CMD(frame) = cmd;
PN533_FRAME_CMD(frame) = cmd_code;
frame->datalen = 2;
}
static void pn533_tx_frame_finish(struct pn533_frame *frame)
static void pn533_tx_frame_finish(void *_frame)
{
struct pn533_frame *frame = _frame;
frame->datalen_checksum = pn533_checksum(frame->datalen);
PN533_FRAME_CHECKSUM(frame) =
......@@ -416,9 +434,17 @@ static void pn533_tx_frame_finish(struct pn533_frame *frame)
PN533_FRAME_POSTAMBLE(frame) = 0;
}
static bool pn533_rx_frame_is_valid(struct pn533_frame *frame)
static void pn533_tx_update_payload_len(void *_frame, int len)
{
struct pn533_frame *frame = _frame;
frame->datalen += len;
}
static bool pn533_rx_frame_is_valid(void *_frame)
{
u8 checksum;
struct pn533_frame *frame = _frame;
if (frame->start_frame != cpu_to_be16(PN533_SOF))
return false;
......@@ -445,9 +471,39 @@ static bool pn533_rx_frame_is_ack(struct pn533_frame *frame)
return true;
}
static bool pn533_rx_frame_is_cmd_response(struct pn533_frame *frame, u8 cmd)
static inline int pn533_rx_frame_size(void *frame)
{
struct pn533_frame *f = frame;
return sizeof(struct pn533_frame) + f->datalen + PN533_FRAME_TAIL_LEN;
}
static u8 pn533_get_cmd_code(void *frame)
{
struct pn533_frame *f = frame;
return PN533_FRAME_CMD(f);
}
struct pn533_frame_ops pn533_std_frame_ops = {
.tx_frame_init = pn533_tx_frame_init,
.tx_frame_finish = pn533_tx_frame_finish,
.tx_update_payload_len = pn533_tx_update_payload_len,
.tx_header_len = PN533_FRAME_HEADER_LEN,
.tx_tail_len = PN533_FRAME_TAIL_LEN,
.rx_is_frame_valid = pn533_rx_frame_is_valid,
.rx_frame_size = pn533_rx_frame_size,
.rx_header_len = PN533_FRAME_HEADER_LEN,
.rx_tail_len = PN533_FRAME_TAIL_LEN,
.max_payload_len = PN533_FRAME_MAX_PAYLOAD_LEN,
.get_cmd_code = pn533_get_cmd_code,
};
static bool pn533_rx_frame_is_cmd_response(struct pn533 *dev, void *frame)
{
return (PN533_FRAME_CMD(frame) == PN533_CMD_RESPONSE(cmd));
return (dev->ops->get_cmd_code(frame) == PN533_CMD_RESPONSE(dev->cmd));
}
......@@ -464,7 +520,7 @@ static void pn533_wq_cmd_complete(struct work_struct *work)
static void pn533_recv_response(struct urb *urb)
{
struct pn533 *dev = urb->context;
struct pn533_frame *in_frame;
u8 *in_frame;
switch (urb->status) {
case 0:
......@@ -489,15 +545,15 @@ static void pn533_recv_response(struct urb *urb)
nfc_dev_dbg(&dev->interface->dev, "Received a frame.");
print_hex_dump(KERN_DEBUG, "PN533 RX: ", DUMP_PREFIX_NONE, 16, 1,
in_frame, PN533_FRAME_SIZE(in_frame), false);
in_frame, dev->ops->rx_frame_size(in_frame), false);
if (!pn533_rx_frame_is_valid(in_frame)) {
if (!dev->ops->rx_is_frame_valid(in_frame)) {
nfc_dev_err(&dev->interface->dev, "Received an invalid frame");
dev->wq_in_error = -EIO;
goto sched_wq;
}
if (!pn533_rx_frame_is_cmd_response(in_frame, dev->cmd)) {
if (!pn533_rx_frame_is_cmd_response(dev, in_frame)) {
nfc_dev_err(&dev->interface->dev,
"It it not the response to the last command");
dev->wq_in_error = -EIO;
......@@ -595,7 +651,7 @@ static int __pn533_send_frame_async(struct pn533 *dev,
{
int rc;
dev->cmd = PN533_FRAME_CMD(((struct pn533_frame *)out->data));
dev->cmd = dev->ops->get_cmd_code(out->data);
dev->cmd_complete = cmd_complete;
dev->cmd_complete_arg = arg;
......@@ -623,20 +679,20 @@ static int __pn533_send_frame_async(struct pn533 *dev,
return rc;
}
static void pn533_build_cmd_frame(u8 cmd_code, struct sk_buff *skb)
static void pn533_build_cmd_frame(struct pn533 *dev, u8 cmd_code,
struct sk_buff *skb)
{
struct pn533_frame *frame;
/* payload is already there, just update datalen */
int payload_len = skb->len;
struct pn533_frame_ops *ops = dev->ops;
skb_push(skb, PN533_FRAME_HEADER_LEN);
skb_put(skb, PN533_FRAME_TAIL_LEN);
frame = (struct pn533_frame *)skb->data;
skb_push(skb, ops->tx_header_len);
skb_put(skb, ops->tx_tail_len);
pn533_tx_frame_init(frame, cmd_code);
frame->datalen += payload_len;
pn533_tx_frame_finish(frame);
ops->tx_frame_init(skb->data, cmd_code);
ops->tx_update_payload_len(skb->data, payload_len);
ops->tx_frame_finish(skb->data);
}
struct pn533_send_async_complete_arg {
......@@ -653,7 +709,6 @@ static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
struct sk_buff *req = arg->req;
struct sk_buff *resp = arg->resp;
struct pn533_frame *frame = (struct pn533_frame *)resp->data;
int rc;
dev_kfree_skb(req);
......@@ -666,9 +721,9 @@ static int pn533_send_async_complete(struct pn533 *dev, void *_arg, int status)
return status;
}
skb_put(resp, PN533_FRAME_SIZE(frame));
skb_pull(resp, PN533_FRAME_HEADER_LEN);
skb_trim(resp, resp->len - PN533_FRAME_TAIL_LEN);
skb_put(resp, dev->ops->rx_frame_size(resp->data));
skb_pull(resp, dev->ops->rx_header_len);
skb_trim(resp, resp->len - dev->ops->rx_tail_len);
rc = arg->complete_cb(dev, arg->complete_cb_context, resp);
......@@ -697,7 +752,7 @@ static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
arg->resp = resp;
arg->req = req;
pn533_build_cmd_frame(cmd_code, req);
pn533_build_cmd_frame(dev, cmd_code, req);
mutex_lock(&dev->cmd_lock);
......@@ -724,6 +779,7 @@ static int __pn533_send_async(struct pn533 *dev, u8 cmd_code,
cmd->cmd_code = cmd_code;
cmd->req = req;
cmd->resp = resp;
cmd->resp_len = resp_len;
cmd->arg = arg;
list_add_tail(&cmd->queue, &dev->cmd_queue);
......@@ -744,9 +800,9 @@ static int pn533_send_data_async(struct pn533 *dev, u8 cmd_code,
{
struct sk_buff *resp;
int rc;
int resp_len = PN533_FRAME_HEADER_LEN +
PN533_FRAME_MAX_PAYLOAD_LEN +
PN533_FRAME_TAIL_LEN;
int resp_len = dev->ops->rx_header_len +
dev->ops->max_payload_len +
dev->ops->rx_tail_len;
resp = nfc_alloc_recv_skb(resp_len, GFP_KERNEL);
if (!resp)
......@@ -767,14 +823,16 @@ static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code,
{
struct sk_buff *resp;
int rc;
int resp_len = dev->ops->rx_header_len +
dev->ops->max_payload_len +
dev->ops->rx_tail_len;
resp = alloc_skb(PN533_NORMAL_FRAME_MAX_LEN, GFP_KERNEL);
resp = alloc_skb(resp_len, GFP_KERNEL);
if (!resp)
return -ENOMEM;
rc = __pn533_send_async(dev, cmd_code, req, resp,
PN533_NORMAL_FRAME_MAX_LEN,
complete_cb, complete_cb_context);
rc = __pn533_send_async(dev, cmd_code, req, resp, resp_len, complete_cb,
complete_cb_context);
if (rc)
dev_kfree_skb(resp);
......@@ -797,9 +855,9 @@ static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
struct pn533_send_async_complete_arg *arg;
struct sk_buff *resp;
int rc;
int resp_len = PN533_FRAME_HEADER_LEN +
PN533_FRAME_MAX_PAYLOAD_LEN +
PN533_FRAME_TAIL_LEN;
int resp_len = dev->ops->rx_header_len +
dev->ops->max_payload_len +
dev->ops->rx_tail_len;
resp = alloc_skb(resp_len, GFP_KERNEL);
if (!resp)
......@@ -816,7 +874,7 @@ static int pn533_send_cmd_direct_async(struct pn533 *dev, u8 cmd_code,
arg->resp = resp;
arg->req = req;
pn533_build_cmd_frame(cmd_code, req);
pn533_build_cmd_frame(dev, cmd_code, req);
rc = __pn533_send_frame_async(dev, req, resp, resp_len,
pn533_send_async_complete, arg);
......@@ -847,10 +905,8 @@ static void pn533_wq_cmd(struct work_struct *work)
mutex_unlock(&dev->cmd_lock);
__pn533_send_frame_async(dev, cmd->req, cmd->resp,
PN533_NORMAL_FRAME_MAX_LEN,
pn533_send_async_complete,
cmd->arg);
__pn533_send_frame_async(dev, cmd->req, cmd->resp, cmd->resp_len,
pn533_send_async_complete, cmd->arg);
kfree(cmd);
}
......@@ -928,16 +984,16 @@ static void pn533_send_complete(struct urb *urb)
}
}
static struct sk_buff *pn533_alloc_skb(unsigned int size)
static struct sk_buff *pn533_alloc_skb(struct pn533 *dev, unsigned int size)
{
struct sk_buff *skb;
skb = alloc_skb(PN533_FRAME_HEADER_LEN +
skb = alloc_skb(dev->ops->tx_header_len +
size +
PN533_FRAME_TAIL_LEN, GFP_KERNEL);
dev->ops->tx_tail_len, GFP_KERNEL);
if (skb)
skb_reserve(skb, PN533_FRAME_HEADER_LEN);
skb_reserve(skb, dev->ops->tx_header_len);
return skb;
}
......@@ -1297,11 +1353,14 @@ static int pn533_start_poll_complete(struct pn533 *dev, struct sk_buff *resp)
return -EAGAIN;
}
static struct sk_buff *pn533_alloc_poll_tg_frame(u8 *gbytes, size_t gbytes_len)
static struct sk_buff *pn533_alloc_poll_tg_frame(struct pn533 *dev)
{
struct sk_buff *skb;
u8 *felica, *nfcid3, *gb;
u8 *gbytes = dev->gb;
size_t gbytes_len = dev->gb_len;
u8 felica_params[18] = {0x1, 0xfe, /* DEP */
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, /* random */
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
......@@ -1316,7 +1375,7 @@ static struct sk_buff *pn533_alloc_poll_tg_frame(u8 *gbytes, size_t gbytes_len)
gbytes_len +
1; /* len Tk*/
skb = pn533_alloc_skb(skb_len);
skb = pn533_alloc_skb(dev, skb_len);
if (!skb)
return NULL;
......@@ -1382,7 +1441,7 @@ static void pn533_wq_tg_get_data(struct work_struct *work)
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(0);
skb = pn533_alloc_skb(dev, 0);
if (!skb)
return;
......@@ -1507,12 +1566,12 @@ static int pn533_poll_complete(struct pn533 *dev, void *arg,
return rc;
}
static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533_poll_modulations
*mod)
static struct sk_buff *pn533_alloc_poll_in_frame(struct pn533 *dev,
struct pn533_poll_modulations *mod)
{
struct sk_buff *skb;
skb = pn533_alloc_skb(mod->len);
skb = pn533_alloc_skb(dev, mod->len);
if (!skb)
return NULL;
......@@ -1535,10 +1594,10 @@ static int pn533_send_poll_frame(struct pn533 *dev)
if (mod->len == 0) { /* Listen mode */
cmd_code = PN533_CMD_TG_INIT_AS_TARGET;
skb = pn533_alloc_poll_tg_frame(dev->gb, dev->gb_len);
skb = pn533_alloc_poll_tg_frame(dev);
} else { /* Polling mode */
cmd_code = PN533_CMD_IN_LIST_PASSIVE_TARGET;
skb = pn533_alloc_poll_in_frame(mod);
skb = pn533_alloc_poll_in_frame(dev, mod);
}
if (!skb) {
......@@ -1652,7 +1711,7 @@ static int pn533_activate_target_nfcdep(struct pn533 *dev)
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(sizeof(u8) * 2); /*TG + Next*/
skb = pn533_alloc_skb(dev, sizeof(u8) * 2); /*TG + Next*/
if (!skb)
return -ENOMEM;
......@@ -1746,7 +1805,7 @@ static void pn533_deactivate_target(struct nfc_dev *nfc_dev,
dev->tgt_active_prot = 0;
skb_queue_purge(&dev->resp_q);
skb = pn533_alloc_skb(sizeof(u8));
skb = pn533_alloc_skb(dev, sizeof(u8));
if (!skb)
return;
......@@ -1877,7 +1936,7 @@ static int pn533_dep_link_up(struct nfc_dev *nfc_dev, struct nfc_target *target,
if (comm_mode == NFC_COMM_PASSIVE)
skb_len += PASSIVE_DATA_LEN;
skb = pn533_alloc_skb(skb_len);
skb = pn533_alloc_skb(dev, skb_len);
if (!skb)
return -ENOMEM;
......@@ -2161,7 +2220,7 @@ static void pn533_wq_mi_recv(struct work_struct *work)
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(PN533_CMD_DATAEXCH_HEAD_LEN);
skb = pn533_alloc_skb(dev, PN533_CMD_DATAEXCH_HEAD_LEN);
if (!skb)
goto error;
......@@ -2214,7 +2273,7 @@ static int pn533_set_configuration(struct pn533 *dev, u8 cfgitem, u8 *cfgdata,
skb_len = sizeof(cfgitem) + cfgdata_len; /* cfgitem + cfgdata */
skb = pn533_alloc_skb(skb_len);
skb = pn533_alloc_skb(dev, skb_len);
if (!skb)
return -ENOMEM;
......@@ -2235,7 +2294,7 @@ static int pn533_get_firmware_version(struct pn533 *dev,
struct sk_buff *skb;
struct sk_buff *resp;
skb = pn533_alloc_skb(0);
skb = pn533_alloc_skb(dev, 0);
if (!skb)
return -ENOMEM;
......@@ -2259,7 +2318,7 @@ static int pn533_fw_reset(struct pn533 *dev)
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
skb = pn533_alloc_skb(sizeof(u8));
skb = pn533_alloc_skb(dev, sizeof(u8));
if (!skb)
return -ENOMEM;
......@@ -2436,14 +2495,7 @@ static int pn533_probe(struct usb_interface *interface,
usb_set_intfdata(interface, dev);
memset(&fw_ver, 0, sizeof(fw_ver));
rc = pn533_get_firmware_version(dev, &fw_ver);
if (rc < 0)
goto destroy_wq;
nfc_dev_info(&dev->interface->dev,
"NXP PN533 firmware ver %d.%d now attached",
fw_ver.ver, fw_ver.rev);
dev->ops = &pn533_std_frame_ops;
dev->device_type = id->driver_info;
switch (dev->device_type) {
......@@ -2462,10 +2514,20 @@ static int pn533_probe(struct usb_interface *interface,
goto destroy_wq;
}
memset(&fw_ver, 0, sizeof(fw_ver));
rc = pn533_get_firmware_version(dev, &fw_ver);
if (rc < 0)
goto destroy_wq;
nfc_dev_info(&dev->interface->dev,
"NXP PN533 firmware ver %d.%d now attached",
fw_ver.ver, fw_ver.rev);
dev->nfc_dev = nfc_allocate_device(&pn533_nfc_ops, protocols,
PN533_FRAME_HEADER_LEN +
dev->ops->tx_header_len +
PN533_CMD_DATAEXCH_HEAD_LEN,
PN533_FRAME_TAIL_LEN);
dev->ops->tx_tail_len);
if (!dev->nfc_dev)
goto destroy_wq;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment