NFC: Add snapshot of NQxxx NFC driver

Add the latest version of NQxxx NFC driver from 'msm-4.9
commit 71661100f78c ("NFC: Remove PMIC clock voting from HLOS")'.

After taking snapshot we have modified code to address
one of the banned API.

Change-Id: I4cf01400be377cbfb2d709292795d711a5688948
Signed-off-by: Gaurav Singhal <gsinghal@codeaurora.org>

Documentation/devicetree/bindings/nfc/nq-nci.txt

@@ -0,0 +1,49 @@
+Qualcomm Technologies, Inc NQxxxx NFC NCI device
+
+Near Field Communication (NFC) device is based on NFC Controller Interface (NCI)
+
+Required properties:
+
+- compatible: "qcom,nq-nci"
+- reg: NCI i2c slave address.
+- qcom,nq-ven: specific gpio for hardware reset.
+- qcom,nq-irq: specific gpio for read interrupt.
+- qcom,nq-firm: gpio for firmware download
+- qcom,nq-clkreq: gpio for clock
+- interrupt-parent: Should be phandle for the interrupt controller
+                    that services interrupts for this device.
+- interrupts: Nfc read interrupt,gpio-clk-req interrupt
+
+
+Recommended properties:
+
+- interrupt-names: names of interrupts, should include "nfc_irq", used for reference
+
+
+Optional properties:
+
+- pinctrl-names, pinctrl-0, pincntrl-1: references to our pincntrl settings
+- clocks, clock-names: must contain the NQxxxx's core clock.
+- qcom,nq-esepwr: gpio to control power of secure element
+- qcom,clk-src: NFC clock for antenna
+
+Example:
+
+	nq-nci@2b {
+		compatible = "qcom,nq-nci";
+		reg = <0x2b>;
+		qcom,nq-irq = <&tlmm 29 0x00>;
+		qcom,nq-ven = <&tlmm 30 0x00>;
+		qcom,nq-firm = <&tlmm 93 0x00>;
+		qcom,nq-clkreq = <&pm8998_gpios 21 0x00>;
+		qcom,nq-esepwr = <&tlmm 116 0x00>;
+		qcom,clk-src = "BBCLK2";
+		interrupt-parent = <&tlmm>;
+		interrupts = <29 0>;
+		interrupt-names = "nfc_irq";
+		pinctrl-names = "nfc_active","nfc_suspend";
+		pinctrl-0 = <&nfc_int_active &nfc_disable_active>;
+		pinctrl-1 = <&nfc_int_suspend &nfc_disable_suspend>;
+		clocks = <&clock_rpm clk_bb_clk2_pin>;
+		clock-names = "ref_clk";
+	};

drivers/nfc/Kconfig

@@ -59,3 +59,11 @@ source "drivers/nfc/nxp-nci/Kconfig"
 source "drivers/nfc/s3fwrn5/Kconfig"
 source "drivers/nfc/st95hf/Kconfig"
 endmenu
+
+config NFC_NQ
+        tristate "QTI NCI based NFC Controller Driver for NQx"
+        depends on I2C
+        help
+          This enables the NFC driver for NQx based devices.
+          This is for i2c connected version. NCI protocol logic
+          resides in the usermode and it has no other NFC dependencies.

drivers/nfc/Makefile

@@ -17,3 +17,4 @@ obj-$(CONFIG_NFC_ST_NCI)	+= st-nci/
 obj-$(CONFIG_NFC_NXP_NCI)	+= nxp-nci/
 obj-$(CONFIG_NFC_S3FWRN5)	+= s3fwrn5/
 obj-$(CONFIG_NFC_ST95HF)	+= st95hf/
+obj-$(CONFIG_NFC_NQ)		+= nq-nci.o

drivers/nfc/nq-nci.h

@@ -0,0 +1,54 @@
+/* Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#ifndef __NQ_NCI_H
+#define __NQ_NCI_H
+
+#include <linux/i2c.h>
+#include <linux/types.h>
+#include <linux/version.h>
+
+#include <linux/semaphore.h>
+#include <linux/completion.h>
+
+#include <linux/ioctl.h>
+#include <linux/cdev.h>
+#include <linux/nfcinfo.h>
+
+#define NFC_SET_PWR			_IOW(0xE9, 0x01, unsigned int)
+#define ESE_SET_PWR			_IOW(0xE9, 0x02, unsigned int)
+#define ESE_GET_PWR			_IOR(0xE9, 0x03, unsigned int)
+#define SET_RX_BLOCK			_IOW(0xE9, 0x04, unsigned int)
+#define SET_EMULATOR_TEST_POINT		_IOW(0xE9, 0x05, unsigned int)
+#define NFCC_INITIAL_CORE_RESET_NTF	_IOW(0xE9, 0x10, unsigned int)
+
+#define NFC_RX_BUFFER_CNT_START		(0x0)
+#define PAYLOAD_HEADER_LENGTH		(0x3)
+#define PAYLOAD_LENGTH_MAX		(256)
+#define BYTE				(0x8)
+#define NCI_IDENTIFIER			(0x10)
+
+enum nfcc_initial_core_reset_ntf {
+	TIMEDOUT_INITIAL_CORE_RESET_NTF = 0, /* 0*/
+	ARRIVED_INITIAL_CORE_RESET_NTF, /* 1 */
+	DEFAULT_INITIAL_CORE_RESET_NTF, /*2*/
+};
+
+enum nfcc_chip_variant {
+	NFCC_NQ_210			= 0x48,	/**< NFCC NQ210 */
+	NFCC_NQ_220			= 0x58,	/**< NFCC NQ220 */
+	NFCC_NQ_310			= 0x40,	/**< NFCC NQ310 */
+	NFCC_NQ_330			= 0x51,	/**< NFCC NQ330 */
+	NFCC_PN66T			= 0x18,	/**< NFCC PN66T */
+	NFCC_NOT_SUPPORTED	        = 0xFF	/**< NFCC is not supported */
+};
+#endif

include/linux/nfcinfo.h

@@ -0,0 +1,18 @@
+/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ */
+
+#ifndef _NFCINFO_H
+#define _NFCINFO_H
+
+#include <uapi/linux/nfc/nfcinfo.h>
+
+#endif

include/uapi/linux/Kbuild

@@ -15,3 +15,4 @@ no-export-headers += kvm_para.h
 endif
 
 header-y += sockev.h
+header-y += nfc/

include/uapi/linux/nfc/Kbuild

@@ -0,0 +1,2 @@
+#UAPI export list
+header-y += nfcinfo.h

include/uapi/linux/nfc/nfcinfo.h

@@ -0,0 +1,21 @@
+#ifndef _UAPI_NFCINFO_H_
+#define _UAPI_NFCINFO_H_
+
+#include <linux/ioctl.h>
+
+#define NFCC_MAGIC 0xE9
+#define NFCC_GET_INFO _IOW(NFCC_MAGIC, 0x09, unsigned int)
+
+struct nqx_devinfo {
+	unsigned char chip_type;
+	unsigned char rom_version;
+	unsigned char fw_major;
+	unsigned char fw_minor;
+};
+
+union nqx_uinfo {
+	unsigned int i;
+	struct nqx_devinfo info;
+};
+
+#endif