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path: root/drivers/nfc/st21nfcb/st21nfcb.c
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Diffstat (limited to 'drivers/nfc/st21nfcb/st21nfcb.c')
-rw-r--r--drivers/nfc/st21nfcb/st21nfcb.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/drivers/nfc/st21nfcb/st21nfcb.c b/drivers/nfc/st21nfcb/st21nfcb.c
new file mode 100644
index 000000000000..4d95863e3063
--- /dev/null
+++ b/drivers/nfc/st21nfcb/st21nfcb.c
@@ -0,0 +1,129 @@
+/*
+ * NCI based Driver for STMicroelectronics NFC Chip
+ *
+ * Copyright (C) 2014 STMicroelectronics SAS. All rights reserved.
+ *
+ * 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 that 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/nfc.h>
+#include <net/nfc/nci.h>
+#include <net/nfc/nci_core.h>
+
+#include "st21nfcb.h"
+#include "ndlc.h"
+
+#define DRIVER_DESC "NCI NFC driver for ST21NFCB"
+
+static int st21nfcb_nci_open(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+ int r;
+
+ if (test_and_set_bit(ST21NFCB_NCI_RUNNING, &info->flags))
+ return 0;
+
+ r = ndlc_open(info->ndlc);
+ if (r)
+ clear_bit(ST21NFCB_NCI_RUNNING, &info->flags);
+
+ return r;
+}
+
+static int st21nfcb_nci_close(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ if (!test_and_clear_bit(ST21NFCB_NCI_RUNNING, &info->flags))
+ return 0;
+
+ ndlc_close(info->ndlc);
+
+ return 0;
+}
+
+static int st21nfcb_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ skb->dev = (void *)ndev;
+
+ if (!test_bit(ST21NFCB_NCI_RUNNING, &info->flags))
+ return -EBUSY;
+
+ return ndlc_send(info->ndlc, skb);
+}
+
+static struct nci_ops st21nfcb_nci_ops = {
+ .open = st21nfcb_nci_open,
+ .close = st21nfcb_nci_close,
+ .send = st21nfcb_nci_send,
+};
+
+int st21nfcb_nci_probe(struct llt_ndlc *ndlc, int phy_headroom,
+ int phy_tailroom)
+{
+ struct st21nfcb_nci_info *info;
+ int r;
+ u32 protocols;
+
+ info = devm_kzalloc(ndlc->dev,
+ sizeof(struct st21nfcb_nci_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ protocols = NFC_PROTO_JEWEL_MASK
+ | NFC_PROTO_MIFARE_MASK
+ | NFC_PROTO_FELICA_MASK
+ | NFC_PROTO_ISO14443_MASK
+ | NFC_PROTO_ISO14443_B_MASK
+ | NFC_PROTO_NFC_DEP_MASK;
+
+ ndlc->ndev = nci_allocate_device(&st21nfcb_nci_ops, protocols,
+ phy_headroom, phy_tailroom);
+ if (!ndlc->ndev) {
+ pr_err("Cannot allocate nfc ndev\n");
+ r = -ENOMEM;
+ goto err_alloc_ndev;
+ }
+ info->ndlc = ndlc;
+
+ nci_set_drvdata(ndlc->ndev, info);
+
+ r = nci_register_device(ndlc->ndev);
+ if (r)
+ goto err_regdev;
+
+ return r;
+err_regdev:
+ nci_free_device(ndlc->ndev);
+
+err_alloc_ndev:
+ kfree(info);
+ return r;
+}
+EXPORT_SYMBOL_GPL(st21nfcb_nci_probe);
+
+void st21nfcb_nci_remove(struct nci_dev *ndev)
+{
+ struct st21nfcb_nci_info *info = nci_get_drvdata(ndev);
+
+ nci_unregister_device(ndev);
+ nci_free_device(ndev);
+ kfree(info);
+}
+EXPORT_SYMBOL_GPL(st21nfcb_nci_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRIVER_DESC);