NFC: nxp-nci: Add support for NXP NCI chips

Add support for NXP NCI NFC controllers such as the NPC100 or PN7150
families.

Signed-off-by: Clément Perrochaud <clement.perrochaud@effinnov.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 186 insertions, 0 deletions

diff --git a/drivers/nfc/nxp-nci/core.c b/drivers/nfc/nxp-nci/core.c
new file mode 100644
index 000000000000..8979636d48ea
--- /dev/null
+++ b/drivers/nfc/nxp-nci/core.c
@@ -0,0 +1,186 @@
+/*
+ * Generic driver for NXP NCI NFC chips
+ *
+ * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
+ *
+ * Authors: Clément Perrochaud <clement.perrochaud@nxp.com>
+ *
+ * Derived from PN544 device driver:
+ * Copyright (C) 2012  Intel Corporation. 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/delay.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/nfc.h>
+#include <linux/platform_data/nxp-nci.h>
+
+#include <net/nfc/nci_core.h>
+
+#include "nxp-nci.h"
+
+#define NXP_NCI_HDR_LEN	4
+
+#define NXP_NCI_NFC_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)
+
+static int nxp_nci_open(struct nci_dev *ndev)
+{
+	struct nxp_nci_info *info = nci_get_drvdata(ndev);
+	int r = 0;
+
+	mutex_lock(&info->info_lock);
+
+	if (info->mode != NXP_NCI_MODE_COLD) {
+		r = -EBUSY;
+		goto open_exit;
+	}
+
+	if (info->phy_ops->set_mode)
+		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_NCI);
+
+	info->mode = NXP_NCI_MODE_NCI;
+
+open_exit:
+	mutex_unlock(&info->info_lock);
+	return r;
+}
+
+static int nxp_nci_close(struct nci_dev *ndev)
+{
+	struct nxp_nci_info *info = nci_get_drvdata(ndev);
+	int r = 0;
+
+	mutex_lock(&info->info_lock);
+
+	if (info->phy_ops->set_mode)
+		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
+
+	info->mode = NXP_NCI_MODE_COLD;
+
+	mutex_unlock(&info->info_lock);
+	return r;
+}
+
+static int nxp_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
+{
+	struct nxp_nci_info *info = nci_get_drvdata(ndev);
+	int r;
+
+	if (!info->phy_ops->write) {
+		r = -ENOTSUPP;
+		goto send_exit;
+	}
+
+	if (info->mode != NXP_NCI_MODE_NCI) {
+		r = -EINVAL;
+		goto send_exit;
+	}
+
+	r = info->phy_ops->write(info->phy_id, skb);
+	if (r < 0)
+		kfree_skb(skb);
+
+send_exit:
+	return r;
+}
+
+static struct nci_ops nxp_nci_ops = {
+	.open = nxp_nci_open,
+	.close = nxp_nci_close,
+	.send = nxp_nci_send,
+	.fw_download = nxp_nci_fw_download,
+};
+
+int nxp_nci_probe(void *phy_id, struct device *pdev,
+		  struct nxp_nci_phy_ops *phy_ops, unsigned int max_payload,
+		  struct nci_dev **ndev)
+{
+	struct nxp_nci_info *info;
+	int r;
+
+	info = devm_kzalloc(pdev, sizeof(struct nxp_nci_info), GFP_KERNEL);
+	if (!info) {
+		r = -ENOMEM;
+		goto probe_exit;
+	}
+
+	info->phy_id = phy_id;
+	info->pdev = pdev;
+	info->phy_ops = phy_ops;
+	info->max_payload = max_payload;
+	INIT_WORK(&info->fw_info.work, nxp_nci_fw_work);
+	init_completion(&info->fw_info.cmd_completion);
+	mutex_init(&info->info_lock);
+
+	if (info->phy_ops->set_mode) {
+		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
+		if (r < 0)
+			goto probe_exit;
+	}
+
+	info->mode = NXP_NCI_MODE_COLD;
+
+	info->ndev = nci_allocate_device(&nxp_nci_ops, NXP_NCI_NFC_PROTOCOLS,
+					 NXP_NCI_HDR_LEN, 0);
+	if (!info->ndev) {
+		r = -ENOMEM;
+		goto probe_exit;
+	}
+
+	nci_set_parent_dev(info->ndev, pdev);
+	nci_set_drvdata(info->ndev, info);
+	r = nci_register_device(info->ndev);
+	if (r < 0)
+		goto probe_exit_free_nci;
+
+	*ndev = info->ndev;
+
+	goto probe_exit;
+
+probe_exit_free_nci:
+	nci_free_device(info->ndev);
+probe_exit:
+	return r;
+}
+EXPORT_SYMBOL(nxp_nci_probe);
+
+void nxp_nci_remove(struct nci_dev *ndev)
+{
+	struct nxp_nci_info *info = nci_get_drvdata(ndev);
+
+	if (info->mode == NXP_NCI_MODE_FW)
+		nxp_nci_fw_work_complete(info, -ESHUTDOWN);
+	cancel_work_sync(&info->fw_info.work);
+
+	mutex_lock(&info->info_lock);
+
+	if (info->phy_ops->set_mode)
+		info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
+
+	nci_unregister_device(ndev);
+	nci_free_device(ndev);
+
+	mutex_unlock(&info->info_lock);
+}
+EXPORT_SYMBOL(nxp_nci_remove);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("NXP NCI NFC driver");
+MODULE_AUTHOR("Clément Perrochaud <clement.perrochaud@nxp.com>");