diff options
Diffstat (limited to 'drivers/nfc')
| -rw-r--r-- | drivers/nfc/pn533.c | 167 |
1 files changed, 164 insertions, 3 deletions
diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c index 5f3459d..89f7474 100644 --- a/drivers/nfc/pn533.c +++ b/drivers/nfc/pn533.c @@ -117,6 +117,7 @@ MODULE_DEVICE_TABLE(usb, pn533_table); #define PN533_CMD_TG_INIT_AS_TARGET 0x8c #define PN533_CMD_TG_GET_DATA 0x86 #define PN533_CMD_TG_SET_DATA 0x8e +#define PN533_CMD_UNDEF 0xff #define PN533_CMD_RESPONSE(cmd) (cmd + 1) @@ -130,6 +131,9 @@ struct pn533; typedef int (*pn533_cmd_complete_t) (struct pn533 *dev, void *arg, u8 *params, int params_len); +typedef int (*pn533_send_async_complete_t) (struct pn533 *dev, void *arg, + struct sk_buff *resp); + /* structs for pn533 commands */ /* PN533_CMD_GET_FIRMWARE_VERSION */ @@ -390,6 +394,9 @@ struct pn533_cmd { struct pn533_frame *out_frame; struct pn533_frame *in_frame; int in_frame_len; + u8 cmd_code; + struct sk_buff *req; + struct sk_buff *resp; pn533_cmd_complete_t cmd_complete; void *arg; }; @@ -678,6 +685,151 @@ error: return rc; } +static void pn533_build_cmd_frame(u8 cmd_code, struct sk_buff *skb) +{ + struct pn533_frame *frame; + /* payload is already there, just update datalen */ + int payload_len = skb->len; + + skb_push(skb, PN533_FRAME_HEADER_LEN); + skb_put(skb, PN533_FRAME_TAIL_LEN); + + frame = (struct pn533_frame *)skb->data; + + pn533_tx_frame_init(frame, cmd_code); + frame->datalen += payload_len; + pn533_tx_frame_finish(frame); +} + +struct pn533_send_async_complete_arg { + pn533_send_async_complete_t complete_cb; + void *complete_cb_context; + struct sk_buff *resp; + struct sk_buff *req; +}; + +static int pn533_send_async_complete(struct pn533 *dev, void *_arg, u8 *params, + int params_len) +{ + struct pn533_send_async_complete_arg *arg = _arg; + + 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); + + if (params_len < 0) { + nfc_dev_err(&dev->interface->dev, + "Error %d when starting as a target", + params_len); + + arg->complete_cb(dev, arg->complete_cb_context, + ERR_PTR(params_len)); + rc = params_len; + dev_kfree_skb(resp); + goto out; + } + + skb_put(resp, PN533_FRAME_SIZE(frame)); + skb_pull(resp, PN533_FRAME_HEADER_LEN); + skb_trim(resp, resp->len - PN533_FRAME_TAIL_LEN); + + rc = arg->complete_cb(dev, arg->complete_cb_context, resp); + +out: + kfree(arg); + return rc; +} + +static int __pn533_send_async(struct pn533 *dev, u8 cmd_code, + struct sk_buff *req, struct sk_buff *resp, + int resp_len, + pn533_send_async_complete_t complete_cb, + void *complete_cb_context) +{ + struct pn533_cmd *cmd; + struct pn533_send_async_complete_arg *arg; + int rc = 0; + + nfc_dev_dbg(&dev->interface->dev, "%s", __func__); + + arg = kzalloc(sizeof(arg), GFP_KERNEL); + if (!arg) + return -ENOMEM; + + arg->complete_cb = complete_cb; + arg->complete_cb_context = complete_cb_context; + arg->resp = resp; + arg->req = req; + + pn533_build_cmd_frame(cmd_code, req); + + mutex_lock(&dev->cmd_lock); + + if (!dev->cmd_pending) { + rc = __pn533_send_cmd_frame_async(dev, + (struct pn533_frame *)req->data, + (struct pn533_frame *)resp->data, + resp_len, pn533_send_async_complete, + arg); + if (rc) + goto error; + + dev->cmd_pending = 1; + goto unlock; + } + + nfc_dev_dbg(&dev->interface->dev, "%s Queueing command", __func__); + + cmd = kzalloc(sizeof(struct pn533_cmd), GFP_KERNEL); + if (!cmd) { + rc = -ENOMEM; + goto error; + } + + INIT_LIST_HEAD(&cmd->queue); + cmd->cmd_code = cmd_code; + cmd->req = req; + cmd->resp = resp; + cmd->arg = arg; + + list_add_tail(&cmd->queue, &dev->cmd_queue); + + goto unlock; + +error: + kfree(arg); +unlock: + mutex_unlock(&dev->cmd_lock); + return rc; +} + +static int pn533_send_cmd_async(struct pn533 *dev, u8 cmd_code, + struct sk_buff *req, + pn533_send_async_complete_t complete_cb, + void *complete_cb_context) +{ + struct sk_buff *resp; + int rc; + + nfc_dev_dbg(&dev->interface->dev, "%s", __func__); + + resp = alloc_skb(PN533_NORMAL_FRAME_MAX_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); + if (rc) + dev_kfree_skb(resp); + + return rc; +} + static void pn533_wq_cmd(struct work_struct *work) { struct pn533 *dev = container_of(work, struct pn533, cmd_work); @@ -697,9 +849,17 @@ static void pn533_wq_cmd(struct work_struct *work) mutex_unlock(&dev->cmd_lock); - __pn533_send_cmd_frame_async(dev, cmd->out_frame, cmd->in_frame, - cmd->in_frame_len, cmd->cmd_complete, - cmd->arg); + if (cmd->cmd_code != PN533_CMD_UNDEF) + __pn533_send_cmd_frame_async(dev, + (struct pn533_frame *)cmd->req->data, + (struct pn533_frame *)cmd->resp->data, + PN533_NORMAL_FRAME_MAX_LEN, + pn533_send_async_complete, + cmd->arg); + else + __pn533_send_cmd_frame_async(dev, cmd->out_frame, cmd->in_frame, + cmd->in_frame_len, + cmd->cmd_complete, cmd->arg); kfree(cmd); } @@ -740,6 +900,7 @@ static int pn533_send_cmd_frame_async(struct pn533 *dev, cmd->out_frame = out_frame; cmd->in_frame = in_frame; cmd->in_frame_len = in_frame_len; + cmd->cmd_code = PN533_CMD_UNDEF; cmd->cmd_complete = cmd_complete; cmd->arg = arg; |