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NFC Digital: Implement driver commands mechanism
This implements the mechanism used to send commands to the driver in initiator mode through in_send_cmd(). Commands are serialized and sent to the driver by using a work item on the system workqueue. Responses are handled asynchronously by another work item. Once the digital stack receives the response through the command_complete callback, the next command is sent to the driver. This also implements the polling mechanism. It's handled by a work item cycling on all supported protocols. The start poll command for a given protocol is sent to the driver using the mechanism described above. The process continues until a peer is discovered or stop_poll is called. This patch implements the poll function for NFC-A that sends a SENS_REQ command and waits for the SENS_RES response. Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Thierry Escande
Samuel Ortiz
parent
4b10884eb4
commit
59ee2361c9
@ -146,6 +146,15 @@ struct nfc_digital_ops {
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void (*abort_cmd)(struct nfc_digital_dev *ddev);
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};
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#define NFC_DIGITAL_POLL_MODE_COUNT_MAX 6 /* 106A, 212F, and 424F in & tg */
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typedef int (*digital_poll_t)(struct nfc_digital_dev *ddev, u8 rf_tech);
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struct digital_poll_tech {
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u8 rf_tech;
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digital_poll_t poll_func;
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};
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/**
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* Driver capabilities - bit mask made of the following values
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*
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@ -168,6 +177,22 @@ struct nfc_digital_dev {
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u32 driver_capabilities;
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void *driver_data;
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struct digital_poll_tech poll_techs[NFC_DIGITAL_POLL_MODE_COUNT_MAX];
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u8 poll_tech_count;
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u8 poll_tech_index;
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struct mutex poll_lock;
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struct work_struct cmd_work;
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struct work_struct cmd_complete_work;
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struct list_head cmd_queue;
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struct mutex cmd_lock;
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struct work_struct poll_work;
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u8 curr_protocol;
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u8 curr_rf_tech;
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u8 curr_nfc_dep_pni;
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};
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struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
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@ -10,4 +10,4 @@ obj-$(CONFIG_NFC_DIGITAL) += nfc_digital.o
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nfc-objs := core.o netlink.o af_nfc.o rawsock.o llcp_core.o llcp_commands.o \
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llcp_sock.o
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nfc_digital-objs := digital_core.o
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nfc_digital-objs := digital_core.o digital_technology.o
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@ -24,4 +24,33 @@
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#define PROTOCOL_ERR(req) pr_err("%s:%d: NFC Digital Protocol error: %s\n", \
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__func__, __LINE__, req)
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#define DIGITAL_CMD_IN_SEND 0
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#define DIGITAL_CMD_TG_SEND 1
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#define DIGITAL_CMD_TG_LISTEN 2
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#define DIGITAL_CMD_TG_LISTEN_MDAA 3
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#define DIGITAL_MAX_HEADER_LEN 7
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#define DIGITAL_CRC_LEN 2
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struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
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unsigned int len);
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int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
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struct sk_buff *skb, u16 timeout,
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nfc_digital_cmd_complete_t cmd_cb, void *cb_context);
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int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param);
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static inline int digital_in_send_cmd(struct nfc_digital_dev *ddev,
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struct sk_buff *skb, u16 timeout,
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nfc_digital_cmd_complete_t cmd_cb,
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void *cb_context)
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{
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return digital_send_cmd(ddev, DIGITAL_CMD_IN_SEND, skb, timeout, cmd_cb,
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cb_context);
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}
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void digital_poll_next_tech(struct nfc_digital_dev *ddev);
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int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech);
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#endif /* __DIGITAL_H */
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@ -17,24 +17,319 @@
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#include "digital.h"
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#define DIGITAL_PROTO_NFCA_RF_TECH \
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(NFC_PROTO_JEWEL_MASK | NFC_PROTO_MIFARE_MASK)
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struct digital_cmd {
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struct list_head queue;
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u8 type;
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u8 pending;
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u16 timeout;
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struct sk_buff *req;
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struct sk_buff *resp;
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nfc_digital_cmd_complete_t cmd_cb;
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void *cb_context;
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};
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struct sk_buff *digital_skb_alloc(struct nfc_digital_dev *ddev,
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unsigned int len)
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{
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struct sk_buff *skb;
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skb = alloc_skb(len + ddev->tx_headroom + ddev->tx_tailroom,
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GFP_KERNEL);
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if (skb)
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skb_reserve(skb, ddev->tx_headroom);
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return skb;
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}
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static inline void digital_switch_rf(struct nfc_digital_dev *ddev, bool on)
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{
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ddev->ops->switch_rf(ddev, on);
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}
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static inline void digital_abort_cmd(struct nfc_digital_dev *ddev)
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{
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ddev->ops->abort_cmd(ddev);
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}
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static void digital_wq_cmd_complete(struct work_struct *work)
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{
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struct digital_cmd *cmd;
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struct nfc_digital_dev *ddev = container_of(work,
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struct nfc_digital_dev,
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cmd_complete_work);
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mutex_lock(&ddev->cmd_lock);
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cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
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queue);
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if (!cmd) {
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mutex_unlock(&ddev->cmd_lock);
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return;
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}
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list_del(&cmd->queue);
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mutex_unlock(&ddev->cmd_lock);
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if (!IS_ERR(cmd->resp))
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print_hex_dump_debug("DIGITAL RX: ", DUMP_PREFIX_NONE, 16, 1,
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cmd->resp->data, cmd->resp->len, false);
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cmd->cmd_cb(ddev, cmd->cb_context, cmd->resp);
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kfree(cmd);
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schedule_work(&ddev->cmd_work);
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}
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static void digital_send_cmd_complete(struct nfc_digital_dev *ddev,
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void *arg, struct sk_buff *resp)
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{
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struct digital_cmd *cmd = arg;
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cmd->resp = resp;
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schedule_work(&ddev->cmd_complete_work);
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}
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static void digital_wq_cmd(struct work_struct *work)
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{
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int rc;
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struct digital_cmd *cmd;
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struct nfc_digital_dev *ddev = container_of(work,
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struct nfc_digital_dev,
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cmd_work);
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mutex_lock(&ddev->cmd_lock);
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cmd = list_first_entry_or_null(&ddev->cmd_queue, struct digital_cmd,
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queue);
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if (!cmd || cmd->pending) {
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mutex_unlock(&ddev->cmd_lock);
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return;
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}
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mutex_unlock(&ddev->cmd_lock);
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if (cmd->req)
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print_hex_dump_debug("DIGITAL TX: ", DUMP_PREFIX_NONE, 16, 1,
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cmd->req->data, cmd->req->len, false);
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switch (cmd->type) {
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case DIGITAL_CMD_IN_SEND:
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rc = ddev->ops->in_send_cmd(ddev, cmd->req, cmd->timeout,
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digital_send_cmd_complete, cmd);
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break;
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default:
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PR_ERR("Unknown cmd type %d", cmd->type);
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return;
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}
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if (!rc)
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return;
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PR_ERR("in_send_command returned err %d", rc);
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mutex_lock(&ddev->cmd_lock);
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list_del(&cmd->queue);
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mutex_unlock(&ddev->cmd_lock);
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kfree_skb(cmd->req);
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kfree(cmd);
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schedule_work(&ddev->cmd_work);
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}
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int digital_send_cmd(struct nfc_digital_dev *ddev, u8 cmd_type,
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struct sk_buff *skb, u16 timeout,
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nfc_digital_cmd_complete_t cmd_cb, void *cb_context)
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{
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struct digital_cmd *cmd;
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cmd = kzalloc(sizeof(struct digital_cmd), GFP_KERNEL);
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if (!cmd)
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return -ENOMEM;
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cmd->type = cmd_type;
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cmd->timeout = timeout;
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cmd->req = skb;
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cmd->cmd_cb = cmd_cb;
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cmd->cb_context = cb_context;
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INIT_LIST_HEAD(&cmd->queue);
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mutex_lock(&ddev->cmd_lock);
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list_add_tail(&cmd->queue, &ddev->cmd_queue);
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mutex_unlock(&ddev->cmd_lock);
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schedule_work(&ddev->cmd_work);
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return 0;
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}
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int digital_in_configure_hw(struct nfc_digital_dev *ddev, int type, int param)
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{
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int rc;
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rc = ddev->ops->in_configure_hw(ddev, type, param);
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if (rc)
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PR_ERR("in_configure_hw failed: %d", rc);
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return rc;
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}
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void digital_poll_next_tech(struct nfc_digital_dev *ddev)
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{
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digital_switch_rf(ddev, 0);
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mutex_lock(&ddev->poll_lock);
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if (!ddev->poll_tech_count) {
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mutex_unlock(&ddev->poll_lock);
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return;
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}
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ddev->poll_tech_index = (ddev->poll_tech_index + 1) %
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ddev->poll_tech_count;
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mutex_unlock(&ddev->poll_lock);
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schedule_work(&ddev->poll_work);
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}
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static void digital_wq_poll(struct work_struct *work)
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{
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int rc;
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struct digital_poll_tech *poll_tech;
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struct nfc_digital_dev *ddev = container_of(work,
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struct nfc_digital_dev,
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poll_work);
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mutex_lock(&ddev->poll_lock);
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if (!ddev->poll_tech_count) {
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mutex_unlock(&ddev->poll_lock);
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return;
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}
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poll_tech = &ddev->poll_techs[ddev->poll_tech_index];
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mutex_unlock(&ddev->poll_lock);
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rc = poll_tech->poll_func(ddev, poll_tech->rf_tech);
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if (rc)
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digital_poll_next_tech(ddev);
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}
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static void digital_add_poll_tech(struct nfc_digital_dev *ddev, u8 rf_tech,
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digital_poll_t poll_func)
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{
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struct digital_poll_tech *poll_tech;
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if (ddev->poll_tech_count >= NFC_DIGITAL_POLL_MODE_COUNT_MAX)
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return;
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poll_tech = &ddev->poll_techs[ddev->poll_tech_count++];
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poll_tech->rf_tech = rf_tech;
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poll_tech->poll_func = poll_func;
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}
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/**
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* start_poll operation
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*
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* For every supported protocol, the corresponding polling function is added
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* to the table of polling technologies (ddev->poll_techs[]) using
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* digital_add_poll_tech().
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* When a polling function fails (by timeout or protocol error) the next one is
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* schedule by digital_poll_next_tech() on the poll workqueue (ddev->poll_work).
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*/
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static int digital_start_poll(struct nfc_dev *nfc_dev, __u32 im_protocols,
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__u32 tm_protocols)
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{
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return -EOPNOTSUPP;
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struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
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u32 matching_im_protocols, matching_tm_protocols;
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PR_DBG("protocols: im 0x%x, tm 0x%x, supported 0x%x", im_protocols,
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tm_protocols, ddev->protocols);
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matching_im_protocols = ddev->protocols & im_protocols;
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matching_tm_protocols = ddev->protocols & tm_protocols;
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if (!matching_im_protocols && !matching_tm_protocols) {
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PR_ERR("No known protocol");
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return -EINVAL;
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}
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if (ddev->poll_tech_count) {
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PR_ERR("Already polling");
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return -EBUSY;
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}
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if (ddev->curr_protocol) {
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PR_ERR("A target is already active");
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return -EBUSY;
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}
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ddev->poll_tech_count = 0;
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ddev->poll_tech_index = 0;
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if (matching_im_protocols & DIGITAL_PROTO_NFCA_RF_TECH)
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digital_add_poll_tech(ddev, NFC_DIGITAL_RF_TECH_106A,
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digital_in_send_sens_req);
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if (!ddev->poll_tech_count) {
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PR_ERR("Unsupported protocols: im=0x%x, tm=0x%x",
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matching_im_protocols, matching_tm_protocols);
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return -EINVAL;
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}
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schedule_work(&ddev->poll_work);
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return 0;
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}
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static void digital_stop_poll(struct nfc_dev *nfc_dev)
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{
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struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
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mutex_lock(&ddev->poll_lock);
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if (!ddev->poll_tech_count) {
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PR_ERR("Polling operation was not running");
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mutex_unlock(&ddev->poll_lock);
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return;
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}
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ddev->poll_tech_count = 0;
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mutex_unlock(&ddev->poll_lock);
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cancel_work_sync(&ddev->poll_work);
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digital_abort_cmd(ddev);
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}
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static int digital_dev_up(struct nfc_dev *nfc_dev)
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{
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return -EOPNOTSUPP;
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struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
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digital_switch_rf(ddev, 1);
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return 0;
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}
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static int digital_dev_down(struct nfc_dev *nfc_dev)
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{
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return -EOPNOTSUPP;
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struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
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digital_switch_rf(ddev, 0);
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return 0;
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}
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static int digital_dep_link_up(struct nfc_dev *nfc_dev,
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@ -52,12 +347,15 @@ static int digital_dep_link_down(struct nfc_dev *nfc_dev)
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static int digital_activate_target(struct nfc_dev *nfc_dev,
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struct nfc_target *target, __u32 protocol)
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{
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return -EOPNOTSUPP;
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return 0;
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}
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static void digital_deactivate_target(struct nfc_dev *nfc_dev,
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struct nfc_target *target)
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{
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struct nfc_digital_dev *ddev = nfc_get_drvdata(nfc_dev);
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ddev->curr_protocol = 0;
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}
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static int digital_tg_send(struct nfc_dev *dev, struct sk_buff *skb)
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@ -106,8 +404,22 @@ struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
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ddev->driver_capabilities = driver_capabilities;
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ddev->ops = ops;
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ddev->tx_headroom = tx_headroom;
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ddev->tx_tailroom = tx_tailroom;
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mutex_init(&ddev->cmd_lock);
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INIT_LIST_HEAD(&ddev->cmd_queue);
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INIT_WORK(&ddev->cmd_work, digital_wq_cmd);
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INIT_WORK(&ddev->cmd_complete_work, digital_wq_cmd_complete);
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mutex_init(&ddev->poll_lock);
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INIT_WORK(&ddev->poll_work, digital_wq_poll);
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if (supported_protocols & NFC_PROTO_JEWEL_MASK)
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ddev->protocols |= NFC_PROTO_JEWEL_MASK;
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if (supported_protocols & NFC_PROTO_MIFARE_MASK)
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ddev->protocols |= NFC_PROTO_MIFARE_MASK;
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ddev->tx_headroom = tx_headroom + DIGITAL_MAX_HEADER_LEN;
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ddev->tx_tailroom = tx_tailroom + DIGITAL_CRC_LEN;
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ddev->nfc_dev = nfc_allocate_device(&digital_nfc_ops, ddev->protocols,
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ddev->tx_headroom,
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@ -131,7 +443,6 @@ EXPORT_SYMBOL(nfc_digital_allocate_device);
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void nfc_digital_free_device(struct nfc_digital_dev *ddev)
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{
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nfc_free_device(ddev->nfc_dev);
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kfree(ddev);
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}
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EXPORT_SYMBOL(nfc_digital_free_device);
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@ -144,7 +455,22 @@ EXPORT_SYMBOL(nfc_digital_register_device);
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void nfc_digital_unregister_device(struct nfc_digital_dev *ddev)
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{
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struct digital_cmd *cmd, *n;
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nfc_unregister_device(ddev->nfc_dev);
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mutex_lock(&ddev->poll_lock);
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ddev->poll_tech_count = 0;
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mutex_unlock(&ddev->poll_lock);
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cancel_work_sync(&ddev->poll_work);
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cancel_work_sync(&ddev->cmd_work);
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cancel_work_sync(&ddev->cmd_complete_work);
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list_for_each_entry_safe(cmd, n, &ddev->cmd_queue, queue) {
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list_del(&cmd->queue);
|
||||
kfree(cmd);
|
||||
}
|
||||
}
|
||||
EXPORT_SYMBOL(nfc_digital_unregister_device);
|
||||
|
||||
|
||||
64
net/nfc/digital_technology.c
Normal file
64
net/nfc/digital_technology.c
Normal file
@ -0,0 +1,64 @@
|
||||
/*
|
||||
* NFC Digital Protocol stack
|
||||
* Copyright (c) 2013, Intel Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms and conditions of the GNU General Public License,
|
||||
* version 2, as published by the Free Software Foundation.
|
||||
*
|
||||
* This program is distributed in the hope it will be useful, but WITHOUT
|
||||
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
||||
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
||||
* more details.
|
||||
*
|
||||
*/
|
||||
|
||||
#include "digital.h"
|
||||
|
||||
#define DIGITAL_CMD_SENS_REQ 0x26
|
||||
#define DIGITAL_CMD_ALL_REQ 0x52
|
||||
#define DIGITAL_CMD_SEL_REQ_CL1 0x93
|
||||
#define DIGITAL_CMD_SEL_REQ_CL2 0x95
|
||||
#define DIGITAL_CMD_SEL_REQ_CL3 0x97
|
||||
|
||||
#define DIGITAL_SDD_REQ_SEL_PAR 0x20
|
||||
|
||||
#define DIGITAL_SDD_RES_CT 0x88
|
||||
#define DIGITAL_SDD_RES_LEN 5
|
||||
|
||||
static void digital_in_recv_sens_res(struct nfc_digital_dev *ddev, void *arg,
|
||||
struct sk_buff *resp)
|
||||
{
|
||||
if (!IS_ERR(resp))
|
||||
dev_kfree_skb(resp);
|
||||
|
||||
digital_poll_next_tech(ddev);
|
||||
}
|
||||
|
||||
int digital_in_send_sens_req(struct nfc_digital_dev *ddev, u8 rf_tech)
|
||||
{
|
||||
struct sk_buff *skb;
|
||||
int rc;
|
||||
|
||||
rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_RF_TECH,
|
||||
NFC_DIGITAL_RF_TECH_106A);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
rc = digital_in_configure_hw(ddev, NFC_DIGITAL_CONFIG_FRAMING,
|
||||
NFC_DIGITAL_FRAMING_NFCA_SHORT);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
skb = digital_skb_alloc(ddev, 1);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
*skb_put(skb, sizeof(u8)) = DIGITAL_CMD_SENS_REQ;
|
||||
|
||||
rc = digital_in_send_cmd(ddev, skb, 30, digital_in_recv_sens_res, NULL);
|
||||
if (rc)
|
||||
kfree_skb(skb);
|
||||
|
||||
return rc;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user