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NFC: pn533: Add support for ACS ACR122U reader 

ACS ACR122U is an USB NFC reader, PC/SC and CCID compilant, based
on NXP PN532 chip.

Internally, it's build of MCU, PN532 and an antenna. MCU makes the
device CCID and PC/SC compilant and provide USB connection.

In this achitecture, a host cannot talk directly to PN532 and must
rely on MCU. Luckily, MCU exposes pseud-APDU through PC/SC Escape
mechanism which let the host to transmit standard PN532 commands
directly to PN532 chip with some limitations.

The frame roughly looks like:

    CCID header    |          APDU header           |    PN532 header
(pc_to_rdr_escape) |  (pseudo apdu Direct Tramsmit) | (len, TFI, cmd, params)

Accordign to limitations, ACR122U does't provide any mechanism to
abort last issued command.

Signed-off-by: Waldemar Rymarkiewicz <waldemar.rymarkiewicz@tieto.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Waldemar Rymarkiewicz 2013-04-03 08:02:13 +02:00 committed by Samuel Ortiz
parent 58520373d8
commit 53cf48399a
1 changed files with 217 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

219
drivers/nfc/pn533.c
View File

@ -38,8 +38,12 @@
#define SONY_VENDOR_ID 0x054c
#define PASORI_PRODUCT_ID 0x02e1
#define PN533_DEVICE_STD 0x1
#define PN533_DEVICE_PASORI 0x2
#define ACS_VENDOR_ID 0x072f
#define ACR122U_PRODUCT_ID 0x2200
#define PN533_DEVICE_STD 0x1
#define PN533_DEVICE_PASORI 0x2
#define PN533_DEVICE_ACR122U 0x3
#define PN533_ALL_PROTOCOLS (NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK |\
NFC_PROTO_FELICA_MASK | NFC_PROTO_ISO14443_MASK |\
@ -68,6 +72,11 @@ static const struct usb_device_id pn533_table[] = {
.idProduct = PASORI_PRODUCT_ID,
.driver_info = PN533_DEVICE_PASORI,
},
{ .match_flags = USB_DEVICE_ID_MATCH_DEVICE,
.idVendor = ACS_VENDOR_ID,
.idProduct = ACR122U_PRODUCT_ID,
.driver_info = PN533_DEVICE_ACR122U,
},
{ }
};
MODULE_DEVICE_TABLE(usb, pn533_table);
@ -99,6 +108,21 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_STD_FRAME_DIR_OUT 0xD4
#define PN533_STD_FRAME_DIR_IN 0xD5
/* ACS ACR122 pn533 frame definitions */
#define PN533_ACR122_TX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_tx_frame) \
+ 2)
#define PN533_ACR122_TX_FRAME_TAIL_LEN 0
#define PN533_ACR122_RX_FRAME_HEADER_LEN (sizeof(struct pn533_acr122_rx_frame) \
+ 2)
#define PN533_ACR122_RX_FRAME_TAIL_LEN 2
#define PN533_ACR122_FRAME_MAX_PAYLOAD_LEN PN533_STD_FRAME_MAX_PAYLOAD_LEN
/* CCID messages types */
#define PN533_ACR122_PC_TO_RDR_ICCPOWERON 0x62
#define PN533_ACR122_PC_TO_RDR_ESCAPE 0x6B
#define PN533_ACR122_RDR_TO_PC_ESCAPE 0x83
/* PN533 Commands */
#define PN533_STD_FRAME_CMD(f) (f->data[1])
@ -394,6 +418,116 @@ struct pn533_frame_ops {
u8 (*get_cmd_code)(void *frame);
};
struct pn533_acr122_ccid_hdr {
u8 type;
u32 datalen;
u8 slot;
u8 seq;
u8 params[3]; /* 3 msg specific bytes or status, error and 1 specific
byte for reposnse msg */
u8 data[]; /* payload */
} __packed;
struct pn533_acr122_apdu_hdr {
u8 class;
u8 ins;
u8 p1;
u8 p2;
} __packed;
struct pn533_acr122_tx_frame {
struct pn533_acr122_ccid_hdr ccid;
struct pn533_acr122_apdu_hdr apdu;
u8 datalen;
u8 data[]; /* pn533 frame: TFI ... */
} __packed;
struct pn533_acr122_rx_frame {
struct pn533_acr122_ccid_hdr ccid;
u8 data[]; /* pn533 frame : TFI ... */
} __packed;
static void pn533_acr122_tx_frame_init(void *_frame, u8 cmd_code)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->ccid.type = PN533_ACR122_PC_TO_RDR_ESCAPE;
frame->ccid.datalen = sizeof(frame->apdu) + 1; /* sizeof(apdu_hdr) +
sizeof(datalen) */
frame->ccid.slot = 0;
frame->ccid.seq = 0;
frame->ccid.params[0] = 0;
frame->ccid.params[1] = 0;
frame->ccid.params[2] = 0;
frame->data[0] = PN533_STD_FRAME_DIR_OUT;
frame->data[1] = cmd_code;
frame->datalen = 2; /* data[0] + data[1] */
frame->apdu.class = 0xFF;
frame->apdu.ins = 0;
frame->apdu.p1 = 0;
frame->apdu.p2 = 0;
}
static void pn533_acr122_tx_frame_finish(void *_frame)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->ccid.datalen += frame->datalen;
}
static void pn533_acr122_tx_update_payload_len(void *_frame, int len)
{
struct pn533_acr122_tx_frame *frame = _frame;
frame->datalen += len;
}
static bool pn533_acr122_is_rx_frame_valid(void *_frame)
{
struct pn533_acr122_rx_frame *frame = _frame;
if (frame->ccid.type != 0x83)
return false;
if (frame->data[frame->ccid.datalen - 2] == 0x63)
return false;
return true;
}
static int pn533_acr122_rx_frame_size(void *frame)
{
struct pn533_acr122_rx_frame *f = frame;
/* f->ccid.datalen already includes tail length */
return sizeof(struct pn533_acr122_rx_frame) + f->ccid.datalen;
}
static u8 pn533_acr122_get_cmd_code(void *frame)
{
struct pn533_acr122_rx_frame *f = frame;
return PN533_STD_FRAME_CMD(f);
}
static struct pn533_frame_ops pn533_acr122_frame_ops = {
.tx_frame_init = pn533_acr122_tx_frame_init,
.tx_frame_finish = pn533_acr122_tx_frame_finish,
.tx_update_payload_len = pn533_acr122_tx_update_payload_len,
.tx_header_len = PN533_ACR122_TX_FRAME_HEADER_LEN,
.tx_tail_len = PN533_ACR122_TX_FRAME_TAIL_LEN,
.rx_is_frame_valid = pn533_acr122_is_rx_frame_valid,
.rx_header_len = PN533_ACR122_RX_FRAME_HEADER_LEN,
.rx_tail_len = PN533_ACR122_RX_FRAME_TAIL_LEN,
.rx_frame_size = pn533_acr122_rx_frame_size,
.max_payload_len = PN533_ACR122_FRAME_MAX_PAYLOAD_LEN,
.get_cmd_code = pn533_acr122_get_cmd_code,
};
/* The rule: value + checksum = 0 */
static inline u8 pn533_std_checksum(u8 value)
{
@ -2335,6 +2469,72 @@ static int pn533_pasori_fw_reset(struct pn533 *dev)
return 0;
}
struct pn533_acr122_poweron_rdr_arg {
int rc;
struct completion done;
};
static void pn533_acr122_poweron_rdr_resp(struct urb *urb)
{
struct pn533_acr122_poweron_rdr_arg *arg = urb->context;
nfc_dev_dbg(&urb->dev->dev, "%s", __func__);
print_hex_dump(KERN_ERR, "ACR122 RX: ", DUMP_PREFIX_NONE, 16, 1,
urb->transfer_buffer, urb->transfer_buffer_length,
false);
arg->rc = urb->status;
complete(&arg->done);
}
static int pn533_acr122_poweron_rdr(struct pn533 *dev)
{
/* Power on th reader (CCID cmd) */
u8 cmd[10] = {PN533_ACR122_PC_TO_RDR_ICCPOWERON,
0, 0, 0, 0, 0, 0, 3, 0, 0};
u8 buf[255];
int rc;
void *cntx;
struct pn533_acr122_poweron_rdr_arg arg;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
init_completion(&arg.done);
cntx = dev->in_urb->context; /* backup context */
dev->in_urb->transfer_buffer = buf;
dev->in_urb->transfer_buffer_length = 255;
dev->in_urb->complete = pn533_acr122_poweron_rdr_resp;
dev->in_urb->context = &arg;
dev->out_urb->transfer_buffer = cmd;
dev->out_urb->transfer_buffer_length = sizeof(cmd);
print_hex_dump(KERN_ERR, "ACR122 TX: ", DUMP_PREFIX_NONE, 16, 1,
cmd, sizeof(cmd), false);
rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Reader power on cmd error %d", rc);
return rc;
}
rc = usb_submit_urb(dev->in_urb, GFP_KERNEL);
if (rc) {
nfc_dev_err(&dev->interface->dev,
"Can't submit for reader power on cmd response %d",
rc);
return rc;
}
wait_for_completion(&arg.done);
dev->in_urb->context = cntx; /* restore context */
return arg.rc;
}
static struct nfc_ops pn533_nfc_ops = {
.dev_up = NULL,
.dev_down = NULL,
@ -2369,6 +2569,7 @@ static int pn533_setup(struct pn533 *dev)
break;
case PN533_DEVICE_PASORI:
case PN533_DEVICE_ACR122U:
max_retries.mx_rty_atr = 0x2;
max_retries.mx_rty_psl = 0x1;
max_retries.mx_rty_passive_act =
@ -2510,6 +2711,20 @@ static int pn533_probe(struct usb_interface *interface,
protocols = PN533_NO_TYPE_B_PROTOCOLS;
break;
case PN533_DEVICE_ACR122U:
protocols = PN533_NO_TYPE_B_PROTOCOLS;
dev->ops = &pn533_acr122_frame_ops;
dev->protocol_type = PN533_PROTO_REQ_RESP,
rc = pn533_acr122_poweron_rdr(dev);
if (rc < 0) {
nfc_dev_err(&dev->interface->dev,
"Couldn't poweron the reader (error %d)",
rc);
goto destroy_wq;
}
break;
default:
nfc_dev_err(&dev->interface->dev, "Unknown device type %d\n",
dev->device_type);