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>

9 files changed, 657 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index c2016557b294..12fdf22a77b0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6937,6 +6937,13 @@ S:	Supported
 F:      drivers/block/nvme*
 F:      include/linux/nvme.h
 
+NXP-NCI NFC DRIVER
+M:      Clément Perrochaud <clement.perrochaud@effinnov.com>
+R:      Charles Gorand <charles.gorand@effinnov.com>
+L:      linux-nfc@lists.01.org (moderated for non-subscribers)
+S:      Supported
+F:      drivers/nfc/nxp-nci
+
 NXP TDA998X DRM DRIVER
 M:      Russell King <rmk+kernel@arm.linux.org.uk>
 S:      Supported
diff --git a/drivers/nfc/Kconfig b/drivers/nfc/Kconfig
index 7929fac13e1c..107714e4405f 100644
--- a/drivers/nfc/Kconfig
+++ b/drivers/nfc/Kconfig
@@ -73,4 +73,5 @@ source "drivers/nfc/microread/Kconfig"
 source "drivers/nfc/nfcmrvl/Kconfig"
 source "drivers/nfc/st21nfca/Kconfig"
 source "drivers/nfc/st21nfcb/Kconfig"
+source "drivers/nfc/nxp-nci/Kconfig"
 endmenu
diff --git a/drivers/nfc/Makefile b/drivers/nfc/Makefile
index 6b23a2c6e34a..a4292d790f9b 100644
--- a/drivers/nfc/Makefile
+++ b/drivers/nfc/Makefile
@@ -13,5 +13,6 @@ obj-$(CONFIG_NFC_MRVL)		+= nfcmrvl/
 obj-$(CONFIG_NFC_TRF7970A)      += trf7970a.o
 obj-$(CONFIG_NFC_ST21NFCA)      += st21nfca/
 obj-$(CONFIG_NFC_ST21NFCB)      += st21nfcb/
+obj-$(CONFIG_NFC_NXP_NCI)       += nxp-nci/
 
 ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
diff --git a/drivers/nfc/nxp-nci/Kconfig b/drivers/nfc/nxp-nci/Kconfig
new file mode 100644
index 000000000000..5f60c7cf02e8
--- /dev/null
+++ b/drivers/nfc/nxp-nci/Kconfig
@@ -0,0 +1,13 @@
+config NFC_NXP_NCI
+        tristate "NXP-NCI NFC driver"
+        depends on NFC_NCI
+        default n
+        ---help---
+          Generic core driver for NXP NCI chips such as the NPC100
+          or PN7150 families.
+          This is a driver based on the NCI NFC kernel layers and
+          will thus not work with NXP libnfc library.
+
+          To compile this driver as a module, choose m here. The module will
+          be called nxp_nci.
+          Say N if unsure.
diff --git a/drivers/nfc/nxp-nci/Makefile b/drivers/nfc/nxp-nci/Makefile
new file mode 100644
index 000000000000..8f1e32826961
--- /dev/null
+++ b/drivers/nfc/nxp-nci/Makefile
@@ -0,0 +1,9 @@
+#
+# Makefile for NXP-NCI NFC driver
+#
+
+nxp-nci-objs = core.o firmware.o
+
+obj-$(CONFIG_NFC_NXP_NCI) += nxp-nci.o
+
+ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG
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;
+        }
+