[char-misc-next 09/12 v3] mei: nfc: Initial nfc implementation

[Samuel Ortiz <sameo@linux.intel.com>]

NFC ME device is exported through the MEI bus to be consumed by the
NFC subsystem.

NFC is represented by two mei clients: An info one and the actual
NFC one. In order to properly build the ME id we first need to retrieve
the firmware information from the info client.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/Kconfig   |    7 ++
 drivers/misc/mei/Makefile  |    1 +
 drivers/misc/mei/client.c  |    3 +
 drivers/misc/mei/mei_dev.h |   28 ++++++
 drivers/misc/mei/nfc.c     |  209 ++++++++++++++++++++++++++++++++++++++++++++
 drivers/misc/mei/nfc.h     |  122 ++++++++++++++++++++++++++
 drivers/misc/mei/pci-me.c  |    2 +
 7 files changed, 372 insertions(+)
 create mode 100644 drivers/misc/mei/nfc.c
 create mode 100644 drivers/misc/mei/nfc.h

diff --git a/drivers/misc/mei/Kconfig b/drivers/misc/mei/Kconfig
index d21b4d0..66e84ef 100644
--- a/drivers/misc/mei/Kconfig
+++ b/drivers/misc/mei/Kconfig
@@ -35,3 +35,10 @@ config INTEL_MEI_ME
 	  82Q33 Express
 	  82X38/X48 Express
 
+config INTEL_MEI_BUS_NFC
+        bool "MEI bus NFC support"
+        depends on INTEL_MEI
+	help
+	  When selecting this option the ME NFC device will be added to the
+	  MEI bus. This is needed by the NFC kernel subsystem for sending and
+	  receiving HCI frames to and from the NFC device.
diff --git a/drivers/misc/mei/Makefile b/drivers/misc/mei/Makefile
index 5948621..644f92e 100644
--- a/drivers/misc/mei/Makefile
+++ b/drivers/misc/mei/Makefile
@@ -11,5 +11,6 @@ mei-objs += main.o
 mei-objs += amthif.o
 mei-objs += wd.o
 mei-objs += bus.o
+mei-$(CONFIG_INTEL_MEI_BUS_NFC) += nfc.o
 mei-$(CONFIG_INTEL_MEI_ME) += pci-me.o
 mei-$(CONFIG_INTEL_MEI_ME) += hw-me.o
diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c
index ef5300a..525fbdf 100644
--- a/drivers/misc/mei/client.c
+++ b/drivers/misc/mei/client.c
@@ -358,6 +358,9 @@ void mei_host_client_init(struct work_struct *work)
 			mei_amthif_host_init(dev);
 		else if (!uuid_le_cmp(client_props->protocol_name, mei_wd_guid))
 			mei_wd_host_init(dev);
+		else if (!uuid_le_cmp(client_props->protocol_name, mei_nfc_guid))
+			mei_nfc_host_init(dev);
+
 	}
 
 	dev->dev_state = MEI_DEV_ENABLED;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index fc485d4..c6e8c2e 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -484,6 +484,34 @@ struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_host *dev,
 
 void mei_amthif_run_next_cmd(struct mei_host *dev);
 
+#ifdef CONFIG_INTEL_MEI_BUS_NFC
+/*
+ * NFC functions
+ */
+int mei_nfc_host_init(struct mei_host *dev);
+void mei_nfc_host_exit(void);
+
+/*
+ * NFC Client UUID
+ */
+extern const uuid_le mei_nfc_guid;
+
+#else
+
+static inline int mei_nfc_host_init(struct mei_host *dev)
+{
+	return 0;
+}
+
+static inline void mei_nfc_host_exit(void)
+{
+	return;
+}
+
+static const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50,
+					    0x94, 0xd4, 0x50, 0x26,
+					    0x67, 0x23, 0x77, 0x5c);
+#endif
 
 int mei_amthif_irq_write_complete(struct mei_host *dev, s32 *slots,
 			struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list);
diff --git a/drivers/misc/mei/nfc.c b/drivers/misc/mei/nfc.c
new file mode 100644
index 0000000..075ceb8
--- /dev/null
+++ b/drivers/misc/mei/nfc.c
@@ -0,0 +1,209 @@
+/*
+ *
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Copyright (c) 2003-2012, Intel Corporation.
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/mei.h>
+#include <linux/mei_bus.h>
+
+#include "mei_dev.h"
+#include "client.h"
+#include "nfc.h"
+
+/** mei_nfc_dev - NFC mei device
+ *
+ * @cl_info: NFC info host client
+ * @init_work: perform connection to the info client
+ * @fw_ivn: NFC Intervace Version Number
+ * @vendor_id: NFC manufacturer ID
+ * @radio_type: NFC radio type
+ */
+struct mei_nfc_dev {
+	struct mei_cl *cl_info;
+	struct work_struct init_work;
+	u8 fw_ivn;
+	u8 vendor_id;
+	u8 radio_type;
+};
+
+static struct mei_nfc_dev nfc_dev;
+
+/* UUIDs for NFC F/W clients */
+const uuid_le mei_nfc_guid = UUID_LE(0x0bb17a78, 0x2a8e, 0x4c50,
+				     0x94, 0xd4, 0x50, 0x26,
+				     0x67, 0x23, 0x77, 0x5c);
+
+static const uuid_le mei_nfc_info_guid = UUID_LE(0xd2de1625, 0x382d, 0x417d,
+					0x48, 0xa4, 0xef, 0xab,
+					0xba, 0x8a, 0x12, 0x06);
+
+static void mei_nfc_free(struct mei_nfc_dev *ndev)
+{
+	if (ndev->cl_info) {
+		list_del(&ndev->cl_info->device_link);
+		mei_cl_unlink(ndev->cl_info);
+		kfree(ndev->cl_info);
+	}
+}
+
+static int mei_nfc_if_version(struct mei_nfc_dev *ndev)
+{
+	struct mei_host *dev;
+	struct mei_cl *cl;
+
+	struct mei_nfc_cmd cmd;
+	struct mei_nfc_reply *reply = NULL;
+	struct mei_nfc_if_version *version;
+	size_t if_version_length;
+	int bytes_recv, ret;
+
+	cl = ndev->cl_info;
+	dev = cl->dev;
+
+	memset(&cmd, 0, sizeof(struct mei_nfc_cmd));
+	cmd.command = MEI_NFC_CMD_MAINTENANCE;
+	cmd.data_size = 1;
+	cmd.sub_command = MEI_NFC_SUBCMD_IF_VERSION;
+
+	ret = __mei_send(cl, (u8 *)&cmd, sizeof(struct mei_nfc_cmd));
+	if (ret < 0) {
+		dev_err(&dev->pdev->dev, "Could not send IF version cmd\n");
+		return ret;
+	}
+
+	/* to be sure on the stack we alloc memory */
+	if_version_length = sizeof(struct mei_nfc_reply) +
+		sizeof(struct mei_nfc_if_version);
+
+	reply = kzalloc(if_version_length, GFP_KERNEL);
+	if (!reply)
+		return -ENOMEM;
+
+	bytes_recv = __mei_recv(cl, (u8 *)reply, if_version_length);
+	if (bytes_recv < 0 || bytes_recv < sizeof(struct mei_nfc_reply)) {
+		dev_err(&dev->pdev->dev, "Could not read IF version\n");
+		ret = -EIO;
+		goto err;
+	}
+
+	version = (struct mei_nfc_if_version *)reply->data;
+
+	ndev->fw_ivn = version->fw_ivn;
+	ndev->vendor_id = version->vendor_id;
+	ndev->radio_type = version->radio_type;
+
+err:
+	kfree(reply);
+	return ret;
+}
+
+static void mei_nfc_init(struct work_struct *work)
+{
+	struct mei_host *dev;
+	struct mei_nfc_dev *ndev;
+	struct mei_cl *cl_info;
+	int ret;
+
+	ndev = container_of(work, struct mei_nfc_dev, init_work);
+
+	cl_info = ndev->cl_info;
+	dev = cl_info->dev;
+
+	mutex_lock(&dev->device_lock);
+
+	if (mei_cl_connect(cl_info, NULL) < 0) {
+		mutex_unlock(&dev->device_lock);
+		dev_err(&dev->pdev->dev,
+			"Could not connect to the NFC INFO ME client");
+
+		goto err;
+	}
+
+	mutex_unlock(&dev->device_lock);
+
+	ret = mei_nfc_if_version(ndev);
+	if (ret < 0) {
+		dev_err(&dev->pdev->dev, "Could not get the NFC interfave version");
+
+		goto err;
+	}
+
+	dev_info(&dev->pdev->dev,
+		"NFC MEI VERSION: IVN 0x%x Vendor ID 0x%x Type 0x%x\n",
+		ndev->fw_ivn, ndev->vendor_id, ndev->radio_type);
+
+	return;
+
+err:
+	mei_nfc_free(ndev);
+
+	return;
+}
+
+
+int mei_nfc_host_init(struct mei_host *dev)
+{
+	struct mei_nfc_dev *ndev = &nfc_dev;
+	struct mei_cl *cl_info;
+	int i, ret;
+
+	/* already initialzed */
+	if (ndev->cl_info)
+		return 0;
+
+	cl_info = mei_cl_allocate(dev);
+	if (!cl_info)
+		return -ENOMEM;
+
+	/* check for valid client id */
+	i = mei_me_cl_by_uuid(dev, &mei_nfc_info_guid);
+	if (i < 0) {
+		dev_info(&dev->pdev->dev, "nfc: failed to find the client\n");
+		return -ENOENT;
+	}
+
+	cl_info->me_client_id = dev->me_clients[i].client_id;
+
+	ret = mei_cl_link(cl_info, MEI_HOST_CLIENT_ID_ANY);
+	if (ret)
+		goto err;
+
+	cl_info->device_uuid = mei_nfc_info_guid;
+
+	list_add_tail(&cl_info->device_link, &dev->device_list);
+
+	ndev->cl_info = cl_info;
+
+	INIT_WORK(&ndev->init_work, mei_nfc_init);
+	schedule_work(&ndev->init_work);
+
+	return 0;
+
+err:
+	mei_nfc_free(ndev);
+
+	return ret;
+}
+
+void mei_nfc_host_exit(void)
+{
+	struct mei_nfc_dev *ndev = &nfc_dev;
+
+	mei_nfc_free(ndev);
+}
diff --git a/drivers/misc/mei/nfc.h b/drivers/misc/mei/nfc.h
new file mode 100644
index 0000000..59e6703
--- /dev/null
+++ b/drivers/misc/mei/nfc.h
@@ -0,0 +1,122 @@
+/******************************************************************************
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ * Intel MEI Interface Header
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * Contact Information:
+ *	Intel Corporation.
+ *	linux-mei@linux.intel.com
+ *	http://www.intel.com
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+
+#ifndef _MEI_NFC_H
+#define _MEI_NFC_H
+
+#include <linux/types.h>
+
+struct mei_nfc_cmd {
+	uint8_t command;
+	uint8_t status;
+	uint16_t req_id;
+	uint32_t reserved;
+	uint16_t data_size;
+	uint8_t sub_command;
+	uint8_t data[];
+} __packed;
+
+struct mei_nfc_reply {
+	uint8_t command;
+	uint8_t status;
+	uint16_t req_id;
+	uint32_t reserved;
+	uint16_t data_size;
+	uint8_t sub_command;
+	uint8_t reply_status;
+	uint8_t data[];
+} __packed;
+
+struct mei_nfc_if_version {
+	uint8_t radio_version_sw[3];
+	uint8_t reserved[3];
+	uint8_t radio_version_hw[3];
+	uint8_t i2c_addr;
+	uint8_t fw_ivn;
+	uint8_t vendor_id;
+	uint8_t radio_type;
+} __packed;
+
+struct mei_nfc_connect {
+	uint8_t fw_ivn;
+	uint8_t vendor_id;
+} __packed;
+
+struct mei_nfc_connect_resp {
+	uint8_t fw_ivn;
+	uint8_t vendor_id;
+	uint16_t me_major;
+	uint16_t me_minor;
+	uint16_t me_hotfix;
+	uint16_t me_build;
+} __packed;
+
+#define MEI_NFC_CMD_MAINTENANCE 0x00
+
+#define MEI_NFC_SUBCMD_CONNECT    0x00
+#define MEI_NFC_SUBCMD_IF_VERSION 0x01
+
+#endif /* _MEI_NFC_H */
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index e31090f..d0e4623 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -277,6 +277,8 @@ static void mei_remove(struct pci_dev *pdev)
 		dev->open_handle_count--;
 	mei_cl_unlink(&dev->iamthif_cl);
 
+	mei_nfc_host_exit();
+
 	dev->iamthif_current_cb = NULL;
 	dev->me_clients_num = 0;
 
-- 
1.7.10.4