v4.19.13 snapshot.
diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h
new file mode 100644
index 0000000..74fa7eb
--- /dev/null
+++ b/include/net/nfc/digital.h
@@ -0,0 +1,274 @@
+/*
+ * NFC Digital Protocol stack
+ * Copyright (c) 2013, 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.
+ *
+ */
+
+#ifndef __NFC_DIGITAL_H
+#define __NFC_DIGITAL_H
+
+#include <linux/skbuff.h>
+#include <net/nfc/nfc.h>
+
+/**
+ * Configuration types for in_configure_hw and tg_configure_hw.
+ */
+enum {
+ NFC_DIGITAL_CONFIG_RF_TECH = 0,
+ NFC_DIGITAL_CONFIG_FRAMING,
+};
+
+/**
+ * RF technology values passed as param argument to in_configure_hw and
+ * tg_configure_hw for NFC_DIGITAL_CONFIG_RF_TECH configuration type.
+ */
+enum {
+ NFC_DIGITAL_RF_TECH_106A = 0,
+ NFC_DIGITAL_RF_TECH_212F,
+ NFC_DIGITAL_RF_TECH_424F,
+ NFC_DIGITAL_RF_TECH_ISO15693,
+ NFC_DIGITAL_RF_TECH_106B,
+
+ NFC_DIGITAL_RF_TECH_LAST,
+};
+
+/**
+ * Framing configuration passed as param argument to in_configure_hw and
+ * tg_configure_hw for NFC_DIGITAL_CONFIG_FRAMING configuration type.
+ */
+enum {
+ NFC_DIGITAL_FRAMING_NFCA_SHORT = 0,
+ NFC_DIGITAL_FRAMING_NFCA_STANDARD,
+ NFC_DIGITAL_FRAMING_NFCA_STANDARD_WITH_CRC_A,
+ NFC_DIGITAL_FRAMING_NFCA_ANTICOL_COMPLETE,
+
+ NFC_DIGITAL_FRAMING_NFCA_T1T,
+ NFC_DIGITAL_FRAMING_NFCA_T2T,
+ NFC_DIGITAL_FRAMING_NFCA_T4T,
+ NFC_DIGITAL_FRAMING_NFCA_NFC_DEP,
+
+ NFC_DIGITAL_FRAMING_NFCF,
+ NFC_DIGITAL_FRAMING_NFCF_T3T,
+ NFC_DIGITAL_FRAMING_NFCF_NFC_DEP,
+ NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED,
+
+ NFC_DIGITAL_FRAMING_ISO15693_INVENTORY,
+ NFC_DIGITAL_FRAMING_ISO15693_T5T,
+
+ NFC_DIGITAL_FRAMING_NFCB,
+ NFC_DIGITAL_FRAMING_NFCB_T4T,
+
+ NFC_DIGITAL_FRAMING_LAST,
+};
+
+#define DIGITAL_MDAA_NFCID1_SIZE 3
+
+struct digital_tg_mdaa_params {
+ u16 sens_res;
+ u8 nfcid1[DIGITAL_MDAA_NFCID1_SIZE];
+ u8 sel_res;
+
+ u8 nfcid2[NFC_NFCID2_MAXSIZE];
+ u16 sc;
+};
+
+struct nfc_digital_dev;
+
+/**
+ * nfc_digital_cmd_complete_t - Definition of command result callback
+ *
+ * @ddev: nfc_digital_device ref
+ * @arg: user data
+ * @resp: response data
+ *
+ * resp pointer can be an error code and will be checked with IS_ERR() macro.
+ * The callback is responsible for freeing resp sk_buff.
+ */
+typedef void (*nfc_digital_cmd_complete_t)(struct nfc_digital_dev *ddev,
+ void *arg, struct sk_buff *resp);
+
+/**
+ * Device side NFC Digital operations
+ *
+ * Initiator mode:
+ * @in_configure_hw: Hardware configuration for RF technology and communication
+ * framing in initiator mode. This is a synchronous function.
+ * @in_send_cmd: Initiator mode data exchange using RF technology and framing
+ * previously set with in_configure_hw. The peer response is returned
+ * through callback cb. If an io error occurs or the peer didn't reply
+ * within the specified timeout (ms), the error code is passed back through
+ * the resp pointer. This is an asynchronous function.
+ *
+ * Target mode: Only NFC-DEP protocol is supported in target mode.
+ * @tg_configure_hw: Hardware configuration for RF technology and communication
+ * framing in target mode. This is a synchronous function.
+ * @tg_send_cmd: Target mode data exchange using RF technology and framing
+ * previously set with tg_configure_hw. The peer next command is returned
+ * through callback cb. If an io error occurs or the peer didn't reply
+ * within the specified timeout (ms), the error code is passed back through
+ * the resp pointer. This is an asynchronous function.
+ * @tg_listen: Put the device in listen mode waiting for data from the peer
+ * device. This is an asynchronous function.
+ * @tg_listen_mdaa: If supported, put the device in automatic listen mode with
+ * mode detection and automatic anti-collision. In this mode, the device
+ * automatically detects the RF technology and executes the anti-collision
+ * detection using the command responses specified in mdaa_params. The
+ * mdaa_params structure contains SENS_RES, NFCID1, and SEL_RES for 106A RF
+ * tech. NFCID2 and system code (sc) for 212F and 424F. The driver returns
+ * the NFC-DEP ATR_REQ command through cb. The digital stack deducts the RF
+ * tech by analyzing the SoD of the frame containing the ATR_REQ command.
+ * This is an asynchronous function.
+ * @tg_listen_md: If supported, put the device in automatic listen mode with
+ * mode detection but without automatic anti-collision. In this mode, the
+ * device automatically detects the RF technology. What the actual
+ * RF technology is can be retrieved by calling @tg_get_rf_tech.
+ * The digital stack will then perform the appropriate anti-collision
+ * sequence. This is an asynchronous function.
+ * @tg_get_rf_tech: Required when @tg_listen_md is supported, unused otherwise.
+ * Return the RF Technology that was detected by the @tg_listen_md call.
+ * This is a synchronous function.
+ *
+ * @switch_rf: Turns device radio on or off. The stack does not call explicitly
+ * switch_rf to turn the radio on. A call to in|tg_configure_hw must turn
+ * the device radio on.
+ * @abort_cmd: Discard the last sent command.
+ *
+ * Notes: Asynchronous functions have a timeout parameter. It is the driver
+ * responsibility to call the digital stack back through the
+ * nfc_digital_cmd_complete_t callback when no RF respsonse has been
+ * received within the specified time (in milliseconds). In that case the
+ * driver must set the resp sk_buff to ERR_PTR(-ETIMEDOUT).
+ * Since the digital stack serializes commands to be sent, it's mandatory
+ * for the driver to handle the timeout correctly. Otherwise the stack
+ * would not be able to send new commands, waiting for the reply of the
+ * current one.
+ */
+struct nfc_digital_ops {
+ int (*in_configure_hw)(struct nfc_digital_dev *ddev, int type,
+ int param);
+ int (*in_send_cmd)(struct nfc_digital_dev *ddev, struct sk_buff *skb,
+ u16 timeout, nfc_digital_cmd_complete_t cb,
+ void *arg);
+
+ int (*tg_configure_hw)(struct nfc_digital_dev *ddev, int type,
+ int param);
+ int (*tg_send_cmd)(struct nfc_digital_dev *ddev, struct sk_buff *skb,
+ u16 timeout, nfc_digital_cmd_complete_t cb,
+ void *arg);
+ int (*tg_listen)(struct nfc_digital_dev *ddev, u16 timeout,
+ nfc_digital_cmd_complete_t cb, void *arg);
+ int (*tg_listen_mdaa)(struct nfc_digital_dev *ddev,
+ struct digital_tg_mdaa_params *mdaa_params,
+ u16 timeout, nfc_digital_cmd_complete_t cb,
+ void *arg);
+ int (*tg_listen_md)(struct nfc_digital_dev *ddev, u16 timeout,
+ nfc_digital_cmd_complete_t cb, void *arg);
+ int (*tg_get_rf_tech)(struct nfc_digital_dev *ddev, u8 *rf_tech);
+
+ int (*switch_rf)(struct nfc_digital_dev *ddev, bool on);
+ void (*abort_cmd)(struct nfc_digital_dev *ddev);
+};
+
+#define NFC_DIGITAL_POLL_MODE_COUNT_MAX 6 /* 106A, 212F, and 424F in & tg */
+
+typedef int (*digital_poll_t)(struct nfc_digital_dev *ddev, u8 rf_tech);
+
+struct digital_poll_tech {
+ u8 rf_tech;
+ digital_poll_t poll_func;
+};
+
+/**
+ * Driver capabilities - bit mask made of the following values
+ *
+ * @NFC_DIGITAL_DRV_CAPS_IN_CRC: The driver handles CRC calculation in initiator
+ * mode.
+ * @NFC_DIGITAL_DRV_CAPS_TG_CRC: The driver handles CRC calculation in target
+ * mode.
+ */
+#define NFC_DIGITAL_DRV_CAPS_IN_CRC 0x0001
+#define NFC_DIGITAL_DRV_CAPS_TG_CRC 0x0002
+
+struct nfc_digital_dev {
+ struct nfc_dev *nfc_dev;
+ struct nfc_digital_ops *ops;
+
+ u32 protocols;
+
+ int tx_headroom;
+ int tx_tailroom;
+
+ u32 driver_capabilities;
+ void *driver_data;
+
+ struct digital_poll_tech poll_techs[NFC_DIGITAL_POLL_MODE_COUNT_MAX];
+ u8 poll_tech_count;
+ u8 poll_tech_index;
+ struct mutex poll_lock;
+
+ struct work_struct cmd_work;
+ struct work_struct cmd_complete_work;
+ struct list_head cmd_queue;
+ struct mutex cmd_lock;
+
+ struct delayed_work poll_work;
+
+ u8 curr_protocol;
+ u8 curr_rf_tech;
+ u8 curr_nfc_dep_pni;
+ u8 did;
+ u16 dep_rwt;
+
+ u8 local_payload_max;
+ u8 remote_payload_max;
+
+ struct sk_buff *chaining_skb;
+ struct digital_data_exch *data_exch;
+
+ int atn_count;
+ int nack_count;
+
+ struct sk_buff *saved_skb;
+
+ u16 target_fsc;
+
+ int (*skb_check_crc)(struct sk_buff *skb);
+ void (*skb_add_crc)(struct sk_buff *skb);
+};
+
+struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,
+ __u32 supported_protocols,
+ __u32 driver_capabilities,
+ int tx_headroom,
+ int tx_tailroom);
+void nfc_digital_free_device(struct nfc_digital_dev *ndev);
+int nfc_digital_register_device(struct nfc_digital_dev *ndev);
+void nfc_digital_unregister_device(struct nfc_digital_dev *ndev);
+
+static inline void nfc_digital_set_parent_dev(struct nfc_digital_dev *ndev,
+ struct device *dev)
+{
+ nfc_set_parent_dev(ndev->nfc_dev, dev);
+}
+
+static inline void nfc_digital_set_drvdata(struct nfc_digital_dev *dev,
+ void *data)
+{
+ dev->driver_data = data;
+}
+
+static inline void *nfc_digital_get_drvdata(struct nfc_digital_dev *dev)
+{
+ return dev->driver_data;
+}
+
+#endif /* __NFC_DIGITAL_H */