NFC: Sony Port-100 Series driver

This adds support for the Sony NFC USB dongle RC-S380, based on the
Port-100 chip. This dongle is an analog frontend and does not implement
the digital layer. This driver uses the nfc_digital module which is an
implementation of the NFC Digital Protocol stack.

This patch is a skeleton. It only registers the dongle against the NFC
digital protocol stack. All NFC digital operation functions are stubbed
out.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Cc: Stephen Tiedemann <stephen.tiedemann@gmail.com>
Tested-by: Cho, Yu-Chen <acho@suse.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/nfc/Kconfig

@@ -46,6 +46,16 @@ config NFC_SIM
 
 	  If unsure, say N.
 
+config NFC_PORT100
+	tristate "Sony NFC Port-100 Series USB device support"
+	depends on USB
+	depends on NFC_DIGITAL
+	help
+	  This adds support for Sony Port-100 chip based USB devices such as the
+	  RC-S380 dongle.
+
+	  If unsure, say N.
+
 source "drivers/nfc/pn544/Kconfig"
 source "drivers/nfc/microread/Kconfig"
 

drivers/nfc/Makefile

@@ -8,5 +8,6 @@ obj-$(CONFIG_NFC_PN533)		+= pn533.o
 obj-$(CONFIG_NFC_WILINK)	+= nfcwilink.o
 obj-$(CONFIG_NFC_MEI_PHY)	+= mei_phy.o
 obj-$(CONFIG_NFC_SIM)		+= nfcsim.o
+obj-$(CONFIG_NFC_PORT100)	+= port100.o
 
 ccflags-$(CONFIG_NFC_DEBUG) := -DDEBUG

drivers/nfc/port100.c

@@ -0,0 +1,187 @@
+/*
+ * Sony NFC Port-100 Series driver
+ * Copyright (c) 2013, Intel Corporation.
+ *
+ * Partly based/Inspired by Stephen Tiedemann's nfcpy
+ *
+ * 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 <linux/module.h>
+#include <linux/usb.h>
+#include <net/nfc/digital.h>
+
+#define VERSION "0.1"
+
+#define SONY_VENDOR_ID    0x054c
+#define RCS380_PRODUCT_ID 0x06c1
+
+#define PORT100_PROTOCOLS (NFC_PROTO_JEWEL_MASK    | \
+			   NFC_PROTO_MIFARE_MASK   | \
+			   NFC_PROTO_FELICA_MASK   | \
+			   NFC_PROTO_NFC_DEP_MASK)
+
+#define PORT100_CAPABILITIES (NFC_DIGITAL_DRV_CAPS_IN_CRC | \
+			      NFC_DIGITAL_DRV_CAPS_TG_CRC)
+
+struct port100 {
+	struct nfc_digital_dev *nfc_digital_dev;
+
+	int skb_headroom;
+	int skb_tailroom;
+
+	struct usb_device *udev;
+	struct usb_interface *interface;
+};
+
+static void port100_abort_cmd(struct nfc_digital_dev *ddev)
+{
+}
+
+static int port100_switch_rf(struct nfc_digital_dev *ddev, bool on)
+{
+	return -EOPNOTSUPP;
+}
+
+static int port100_in_configure_hw(struct nfc_digital_dev *ddev, int type,
+				   int param)
+{
+	return -EOPNOTSUPP;
+}
+
+static int port100_in_send_cmd(struct nfc_digital_dev *ddev,
+			       struct sk_buff *skb, u16 _timeout,
+			       nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+static int port100_tg_configure_hw(struct nfc_digital_dev *ddev, int type,
+				   int param)
+{
+	return -EOPNOTSUPP;
+}
+
+static int port100_tg_send_cmd(struct nfc_digital_dev *ddev,
+			       struct sk_buff *skb, u16 timeout,
+			       nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+static int port100_listen_mdaa(struct nfc_digital_dev *ddev,
+			       struct digital_tg_mdaa_params *params,
+			       u16 timeout,
+			       nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+static int port100_listen(struct nfc_digital_dev *ddev, u16 timeout,
+			  nfc_digital_cmd_complete_t cb, void *arg)
+{
+	return -EOPNOTSUPP;
+}
+
+static struct nfc_digital_ops port100_digital_ops = {
+	.in_configure_hw = port100_in_configure_hw,
+	.in_send_cmd = port100_in_send_cmd,
+
+	.tg_listen_mdaa = port100_listen_mdaa,
+	.tg_listen = port100_listen,
+	.tg_configure_hw = port100_tg_configure_hw,
+	.tg_send_cmd = port100_tg_send_cmd,
+
+	.switch_rf = port100_switch_rf,
+	.abort_cmd = port100_abort_cmd,
+};
+
+static const struct usb_device_id port100_table[] = {
+	{ .match_flags		= USB_DEVICE_ID_MATCH_DEVICE,
+	  .idVendor		= SONY_VENDOR_ID,
+	  .idProduct		= RCS380_PRODUCT_ID,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(usb, port100_table);
+
+static int port100_probe(struct usb_interface *interface,
+			 const struct usb_device_id *id)
+{
+	struct port100 *dev;
+	int rc;
+
+	dev = devm_kzalloc(&interface->dev, sizeof(struct port100), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->udev = usb_get_dev(interface_to_usbdev(interface));
+	dev->interface = interface;
+	usb_set_intfdata(interface, dev);
+
+	nfc_info(&interface->dev, "Sony NFC Port-100 Series attached\n");
+
+	dev->nfc_digital_dev = nfc_digital_allocate_device(&port100_digital_ops,
+							   PORT100_PROTOCOLS,
+							   PORT100_CAPABILITIES,
+							   dev->skb_headroom,
+							   dev->skb_tailroom);
+	if (!dev->nfc_digital_dev) {
+		nfc_err(&interface->dev,
+			"Could not allocate nfc_digital_dev.\n");
+		rc = -ENOMEM;
+		goto error;
+	}
+
+	nfc_digital_set_parent_dev(dev->nfc_digital_dev, &interface->dev);
+	nfc_digital_set_drvdata(dev->nfc_digital_dev, dev);
+
+	rc = nfc_digital_register_device(dev->nfc_digital_dev);
+	if (rc) {
+		nfc_err(&interface->dev,
+			"Could not register digital device.\n");
+		goto free_nfc_dev;
+	}
+
+	return 0;
+
+free_nfc_dev:
+	nfc_digital_free_device(dev->nfc_digital_dev);
+
+error:
+	return rc;
+}
+
+static void port100_disconnect(struct usb_interface *interface)
+{
+	struct port100 *dev;
+
+	dev = usb_get_intfdata(interface);
+	usb_set_intfdata(interface, NULL);
+
+	nfc_digital_unregister_device(dev->nfc_digital_dev);
+	nfc_digital_free_device(dev->nfc_digital_dev);
+
+	nfc_info(&interface->dev, "Sony Port-100 NFC device disconnected");
+}
+
+static struct usb_driver port100_driver = {
+	.name =		"port100",
+	.probe =	port100_probe,
+	.disconnect =	port100_disconnect,
+	.id_table =	port100_table,
+};
+
+module_usb_driver(port100_driver);
+
+MODULE_DESCRIPTION("NFC Port-100 series usb driver ver " VERSION);
+MODULE_VERSION(VERSION);
+MODULE_LICENSE("GPL");