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-rw-r--r--net/nfc/hci/command.c360
1 files changed, 360 insertions, 0 deletions
diff --git a/net/nfc/hci/command.c b/net/nfc/hci/command.c
new file mode 100644
index 000000000..e02b9befc
--- /dev/null
+++ b/net/nfc/hci/command.c
@@ -0,0 +1,360 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2012 Intel Corporation. All rights reserved.
+ */
+
+#define pr_fmt(fmt) "hci: %s: " fmt, __func__
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+
+#include <net/nfc/hci.h>
+
+#include "hci.h"
+
+#define MAX_FWI 4949
+
+static int nfc_hci_execute_cmd_async(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
+ const u8 *param, size_t param_len,
+ data_exchange_cb_t cb, void *cb_context)
+{
+ pr_debug("exec cmd async through pipe=%d, cmd=%d, plen=%zd\n", pipe,
+ cmd, param_len);
+
+ /* TODO: Define hci cmd execution delay. Should it be the same
+ * for all commands?
+ */
+ return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_COMMAND, cmd,
+ param, param_len, cb, cb_context, MAX_FWI);
+}
+
+/*
+ * HCI command execution completion callback.
+ * err will be a standard linux error (may be converted from HCI response)
+ * skb contains the response data and must be disposed, or may be NULL if
+ * an error occured
+ */
+static void nfc_hci_execute_cb(void *context, struct sk_buff *skb, int err)
+{
+ struct hcp_exec_waiter *hcp_ew = (struct hcp_exec_waiter *)context;
+
+ pr_debug("HCI Cmd completed with result=%d\n", err);
+
+ hcp_ew->exec_result = err;
+ if (hcp_ew->exec_result == 0)
+ hcp_ew->result_skb = skb;
+ else
+ kfree_skb(skb);
+ hcp_ew->exec_complete = true;
+
+ wake_up(hcp_ew->wq);
+}
+
+static int nfc_hci_execute_cmd(struct nfc_hci_dev *hdev, u8 pipe, u8 cmd,
+ const u8 *param, size_t param_len,
+ struct sk_buff **skb)
+{
+ DECLARE_WAIT_QUEUE_HEAD_ONSTACK(ew_wq);
+ struct hcp_exec_waiter hcp_ew;
+ hcp_ew.wq = &ew_wq;
+ hcp_ew.exec_complete = false;
+ hcp_ew.result_skb = NULL;
+
+ pr_debug("exec cmd sync through pipe=%d, cmd=%d, plen=%zd\n", pipe,
+ cmd, param_len);
+
+ /* TODO: Define hci cmd execution delay. Should it be the same
+ * for all commands?
+ */
+ hcp_ew.exec_result = nfc_hci_hcp_message_tx(hdev, pipe,
+ NFC_HCI_HCP_COMMAND, cmd,
+ param, param_len,
+ nfc_hci_execute_cb, &hcp_ew,
+ MAX_FWI);
+ if (hcp_ew.exec_result < 0)
+ return hcp_ew.exec_result;
+
+ wait_event(ew_wq, hcp_ew.exec_complete == true);
+
+ if (hcp_ew.exec_result == 0) {
+ if (skb)
+ *skb = hcp_ew.result_skb;
+ else
+ kfree_skb(hcp_ew.result_skb);
+ }
+
+ return hcp_ew.exec_result;
+}
+
+int nfc_hci_send_event(struct nfc_hci_dev *hdev, u8 gate, u8 event,
+ const u8 *param, size_t param_len)
+{
+ u8 pipe;
+
+ pr_debug("%d to gate %d\n", event, gate);
+
+ pipe = hdev->gate2pipe[gate];
+ if (pipe == NFC_HCI_INVALID_PIPE)
+ return -EADDRNOTAVAIL;
+
+ return nfc_hci_hcp_message_tx(hdev, pipe, NFC_HCI_HCP_EVENT, event,
+ param, param_len, NULL, NULL, 0);
+}
+EXPORT_SYMBOL(nfc_hci_send_event);
+
+/*
+ * Execute an hci command sent to gate.
+ * skb will contain response data if success. skb can be NULL if you are not
+ * interested by the response.
+ */
+int nfc_hci_send_cmd(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
+ const u8 *param, size_t param_len, struct sk_buff **skb)
+{
+ u8 pipe;
+
+ pr_debug("\n");
+
+ pipe = hdev->gate2pipe[gate];
+ if (pipe == NFC_HCI_INVALID_PIPE)
+ return -EADDRNOTAVAIL;
+
+ return nfc_hci_execute_cmd(hdev, pipe, cmd, param, param_len, skb);
+}
+EXPORT_SYMBOL(nfc_hci_send_cmd);
+
+int nfc_hci_send_cmd_async(struct nfc_hci_dev *hdev, u8 gate, u8 cmd,
+ const u8 *param, size_t param_len,
+ data_exchange_cb_t cb, void *cb_context)
+{
+ u8 pipe;
+
+ pr_debug("\n");
+
+ pipe = hdev->gate2pipe[gate];
+ if (pipe == NFC_HCI_INVALID_PIPE)
+ return -EADDRNOTAVAIL;
+
+ return nfc_hci_execute_cmd_async(hdev, pipe, cmd, param, param_len,
+ cb, cb_context);
+}
+EXPORT_SYMBOL(nfc_hci_send_cmd_async);
+
+int nfc_hci_set_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
+ const u8 *param, size_t param_len)
+{
+ int r;
+ u8 *tmp;
+
+ /* TODO ELa: reg idx must be inserted before param, but we don't want
+ * to ask the caller to do it to keep a simpler API.
+ * For now, just create a new temporary param buffer. This is far from
+ * optimal though, and the plan is to modify APIs to pass idx down to
+ * nfc_hci_hcp_message_tx where the frame is actually built, thereby
+ * eliminating the need for the temp allocation-copy here.
+ */
+
+ pr_debug("idx=%d to gate %d\n", idx, gate);
+
+ tmp = kmalloc(1 + param_len, GFP_KERNEL);
+ if (tmp == NULL)
+ return -ENOMEM;
+
+ *tmp = idx;
+ memcpy(tmp + 1, param, param_len);
+
+ r = nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_SET_PARAMETER,
+ tmp, param_len + 1, NULL);
+
+ kfree(tmp);
+
+ return r;
+}
+EXPORT_SYMBOL(nfc_hci_set_param);
+
+int nfc_hci_get_param(struct nfc_hci_dev *hdev, u8 gate, u8 idx,
+ struct sk_buff **skb)
+{
+ pr_debug("gate=%d regidx=%d\n", gate, idx);
+
+ return nfc_hci_send_cmd(hdev, gate, NFC_HCI_ANY_GET_PARAMETER,
+ &idx, 1, skb);
+}
+EXPORT_SYMBOL(nfc_hci_get_param);
+
+static int nfc_hci_open_pipe(struct nfc_hci_dev *hdev, u8 pipe)
+{
+ struct sk_buff *skb;
+ int r;
+
+ pr_debug("pipe=%d\n", pipe);
+
+ r = nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_OPEN_PIPE,
+ NULL, 0, &skb);
+ if (r == 0) {
+ /* dest host other than host controller will send
+ * number of pipes already open on this gate before
+ * execution. The number can be found in skb->data[0]
+ */
+ kfree_skb(skb);
+ }
+
+ return r;
+}
+
+static int nfc_hci_close_pipe(struct nfc_hci_dev *hdev, u8 pipe)
+{
+ pr_debug("\n");
+
+ return nfc_hci_execute_cmd(hdev, pipe, NFC_HCI_ANY_CLOSE_PIPE,
+ NULL, 0, NULL);
+}
+
+static u8 nfc_hci_create_pipe(struct nfc_hci_dev *hdev, u8 dest_host,
+ u8 dest_gate, int *result)
+{
+ struct sk_buff *skb;
+ struct hci_create_pipe_params params;
+ struct hci_create_pipe_resp *resp;
+ u8 pipe;
+
+ pr_debug("gate=%d\n", dest_gate);
+
+ params.src_gate = NFC_HCI_ADMIN_GATE;
+ params.dest_host = dest_host;
+ params.dest_gate = dest_gate;
+
+ *result = nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
+ NFC_HCI_ADM_CREATE_PIPE,
+ (u8 *) &params, sizeof(params), &skb);
+ if (*result < 0)
+ return NFC_HCI_INVALID_PIPE;
+
+ resp = (struct hci_create_pipe_resp *)skb->data;
+ pipe = resp->pipe;
+ kfree_skb(skb);
+
+ pr_debug("pipe created=%d\n", pipe);
+
+ return pipe;
+}
+
+static int nfc_hci_delete_pipe(struct nfc_hci_dev *hdev, u8 pipe)
+{
+ pr_debug("\n");
+
+ return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
+ NFC_HCI_ADM_DELETE_PIPE, &pipe, 1, NULL);
+}
+
+static int nfc_hci_clear_all_pipes(struct nfc_hci_dev *hdev)
+{
+ u8 param[2];
+ size_t param_len = 2;
+
+ /* TODO: Find out what the identity reference data is
+ * and fill param with it. HCI spec 6.1.3.5 */
+
+ pr_debug("\n");
+
+ if (test_bit(NFC_HCI_QUIRK_SHORT_CLEAR, &hdev->quirks))
+ param_len = 0;
+
+ return nfc_hci_execute_cmd(hdev, NFC_HCI_ADMIN_PIPE,
+ NFC_HCI_ADM_CLEAR_ALL_PIPE, param, param_len,
+ NULL);
+}
+
+int nfc_hci_disconnect_gate(struct nfc_hci_dev *hdev, u8 gate)
+{
+ int r;
+ u8 pipe = hdev->gate2pipe[gate];
+
+ pr_debug("\n");
+
+ if (pipe == NFC_HCI_INVALID_PIPE)
+ return -EADDRNOTAVAIL;
+
+ r = nfc_hci_close_pipe(hdev, pipe);
+ if (r < 0)
+ return r;
+
+ if (pipe != NFC_HCI_LINK_MGMT_PIPE && pipe != NFC_HCI_ADMIN_PIPE) {
+ r = nfc_hci_delete_pipe(hdev, pipe);
+ if (r < 0)
+ return r;
+ }
+
+ hdev->gate2pipe[gate] = NFC_HCI_INVALID_PIPE;
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_hci_disconnect_gate);
+
+int nfc_hci_disconnect_all_gates(struct nfc_hci_dev *hdev)
+{
+ int r;
+
+ pr_debug("\n");
+
+ r = nfc_hci_clear_all_pipes(hdev);
+ if (r < 0)
+ return r;
+
+ nfc_hci_reset_pipes(hdev);
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_hci_disconnect_all_gates);
+
+int nfc_hci_connect_gate(struct nfc_hci_dev *hdev, u8 dest_host, u8 dest_gate,
+ u8 pipe)
+{
+ bool pipe_created = false;
+ int r;
+
+ pr_debug("\n");
+
+ if (pipe == NFC_HCI_DO_NOT_CREATE_PIPE)
+ return 0;
+
+ if (hdev->gate2pipe[dest_gate] != NFC_HCI_INVALID_PIPE)
+ return -EADDRINUSE;
+
+ if (pipe != NFC_HCI_INVALID_PIPE)
+ goto open_pipe;
+
+ switch (dest_gate) {
+ case NFC_HCI_LINK_MGMT_GATE:
+ pipe = NFC_HCI_LINK_MGMT_PIPE;
+ break;
+ case NFC_HCI_ADMIN_GATE:
+ pipe = NFC_HCI_ADMIN_PIPE;
+ break;
+ default:
+ pipe = nfc_hci_create_pipe(hdev, dest_host, dest_gate, &r);
+ if (pipe == NFC_HCI_INVALID_PIPE)
+ return r;
+ pipe_created = true;
+ break;
+ }
+
+open_pipe:
+ r = nfc_hci_open_pipe(hdev, pipe);
+ if (r < 0) {
+ if (pipe_created)
+ if (nfc_hci_delete_pipe(hdev, pipe) < 0) {
+ /* TODO: Cannot clean by deleting pipe...
+ * -> inconsistent state */
+ }
+ return r;
+ }
+
+ hdev->pipes[pipe].gate = dest_gate;
+ hdev->pipes[pipe].dest_host = dest_host;
+ hdev->gate2pipe[dest_gate] = pipe;
+
+ return 0;
+}
+EXPORT_SYMBOL(nfc_hci_connect_gate);
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