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NFC: Implement pn533 target mode polling loop

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We only want to support p2p target mode for now, no host card emulation.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2012-05-30 23:54:55 +02:00
parent fe7c580073
commit ad3823cef6
1 changed files with 104 additions and 5 deletions
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109
drivers/nfc/pn533.c
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@ -74,6 +74,8 @@ MODULE_DEVICE_TABLE(usb, pn533_table);
#define PN533_CMD_IN_RELEASE 0x52
#define PN533_CMD_IN_JUMP_FOR_DEP 0x56
#define PN533_CMD_TG_INIT_AS_TARGET 0x8c
#define PN533_CMD_RESPONSE(cmd) (cmd + 1)
/* PN533 Return codes */
@ -253,6 +255,25 @@ struct pn533_cmd_jump_dep_response {
u8 gt[];
} __packed;
/* PN533_TG_INIT_AS_TARGET */
#define PN533_INIT_TARGET_PASSIVE 0x1
#define PN533_INIT_TARGET_DEP 0x2
struct pn533_cmd_init_target {
u8 mode;
u8 mifare[6];
u8 felica[18];
u8 nfcid3[10];
u8 gb_len;
u8 gb[];
} __packed;
struct pn533_cmd_init_target_response {
u8 mode;
u8 cmd[];
} __packed;
struct pn533 {
struct usb_device *udev;
struct usb_interface *interface;
@ -1078,9 +1099,86 @@ static int pn533_start_poll_complete(struct pn533 *dev, void *arg,
return 0;
}
static int pn533_init_target_frame(struct pn533_frame *frame,
u8 *gb, size_t gb_len)
{
struct pn533_cmd_init_target *cmd;
size_t cmd_len;
cmd_len = sizeof(struct pn533_cmd_init_target) + gb_len + 1;
cmd = kzalloc(cmd_len, GFP_KERNEL);
if (cmd == NULL)
return -ENOMEM;
pn533_tx_frame_init(frame, PN533_CMD_TG_INIT_AS_TARGET);
/* DEP support only */
cmd->mode |= PN533_INIT_TARGET_DEP;
get_random_bytes(cmd->nfcid3, 10);
cmd->gb_len = gb_len;
memcpy(cmd->gb, gb, gb_len);
/* Len Tk */
cmd->gb[gb_len] = 0;
memcpy(PN533_FRAME_CMD_PARAMS_PTR(frame), cmd, cmd_len);
frame->datalen += cmd_len;
pn533_tx_frame_finish(frame);
return 0;
}
static int pn533_init_target_complete(struct pn533 *dev, void *arg,
u8 *params, int params_len)
{
struct pn533_cmd_init_target_response *resp;
nfc_dev_dbg(&dev->interface->dev, "%s", __func__);
if (params_len < 0) {
nfc_dev_err(&dev->interface->dev,
"Error %d when starting as a target",
params_len);
return params_len;
}
resp = (struct pn533_cmd_init_target_response *) params;
nfc_dev_dbg(&dev->interface->dev, "Target mode 0x%x\n", resp->mode);
return 0;
}
static int pn533_init_target(struct nfc_dev *nfc_dev, u32 protocols)
{
return 0;
struct pn533 *dev = nfc_get_drvdata(nfc_dev);
u8 *gb;
size_t gb_len;
int rc;
pn533_poll_reset_mod_list(dev);
gb = nfc_get_local_general_bytes(nfc_dev, &gb_len);
if (gb == NULL)
return -ENOMEM;
rc = pn533_init_target_frame(dev->out_frame, gb, gb_len);
if (rc < 0)
return rc;
rc = pn533_send_cmd_frame_async(dev, dev->out_frame, dev->in_frame,
dev->in_maxlen,
pn533_init_target_complete,
NULL, GFP_KERNEL);
if (rc)
nfc_dev_err(&dev->interface->dev,
"Error %d when trying to initiate as a target", rc);
dev->poll_mod_count++;
return rc;
}
static int pn533_start_im_poll(struct nfc_dev *nfc_dev, u32 protocols)
@ -1146,12 +1244,13 @@ static int pn533_start_poll(struct nfc_dev *nfc_dev,
return -EBUSY;
}
if (!tm_protocols)
if (im_protocols)
return pn533_start_im_poll(nfc_dev, im_protocols);
else if (!im_protocols)
if (tm_protocols)
return pn533_init_target(nfc_dev, tm_protocols);
else
return -EINVAL;
return -EINVAL;
}
static void pn533_stop_poll(struct nfc_dev *nfc_dev)