// SPDX-License-Identifier: GPL-2.0-only /* * I2C Link Layer for PN544 HCI based Driver * * Copyright (C) 2012 Intel Corporation. All rights reserved. */ #define pr_fmt(fmt) … #include <linux/crc-ccitt.h> #include <linux/module.h> #include <linux/i2c.h> #include <linux/acpi.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/nfc.h> #include <linux/firmware.h> #include <linux/gpio/consumer.h> #include <linux/unaligned.h> #include <net/nfc/hci.h> #include <net/nfc/llc.h> #include <net/nfc/nfc.h> #include "pn544.h" #define PN544_I2C_FRAME_HEADROOM … #define PN544_I2C_FRAME_TAILROOM … /* GPIO names */ #define PN544_GPIO_NAME_IRQ … #define PN544_GPIO_NAME_FW … #define PN544_GPIO_NAME_EN … /* framing in HCI mode */ #define PN544_HCI_I2C_LLC_LEN … #define PN544_HCI_I2C_LLC_CRC … #define PN544_HCI_I2C_LLC_LEN_CRC … #define PN544_HCI_I2C_LLC_MIN_SIZE … #define PN544_HCI_I2C_LLC_MAX_PAYLOAD … #define PN544_HCI_I2C_LLC_MAX_SIZE … static const struct i2c_device_id pn544_hci_i2c_id_table[] = …; MODULE_DEVICE_TABLE(i2c, pn544_hci_i2c_id_table); static const struct acpi_device_id pn544_hci_i2c_acpi_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(acpi, pn544_hci_i2c_acpi_match); #define PN544_HCI_I2C_DRIVER_NAME … /* * Exposed through the 4 most significant bytes * from the HCI SW_VERSION first byte, a.k.a. * SW RomLib. */ #define PN544_HW_VARIANT_C2 … #define PN544_HW_VARIANT_C3 … #define PN544_FW_CMD_RESET … #define PN544_FW_CMD_WRITE … #define PN544_FW_CMD_CHECK … #define PN544_FW_CMD_SECURE_WRITE … #define PN544_FW_CMD_SECURE_CHUNK_WRITE … struct pn544_i2c_fw_frame_write { … } __packed; struct pn544_i2c_fw_frame_check { … } __packed; struct pn544_i2c_fw_frame_response { … } __packed; struct pn544_i2c_fw_blob { … }; struct pn544_i2c_fw_secure_frame { … } __packed; struct pn544_i2c_fw_secure_blob { … }; #define PN544_FW_CMD_RESULT_TIMEOUT … #define PN544_FW_CMD_RESULT_BAD_CRC … #define PN544_FW_CMD_RESULT_ACCESS_DENIED … #define PN544_FW_CMD_RESULT_PROTOCOL_ERROR … #define PN544_FW_CMD_RESULT_INVALID_PARAMETER … #define PN544_FW_CMD_RESULT_UNSUPPORTED_COMMAND … #define PN544_FW_CMD_RESULT_INVALID_LENGTH … #define PN544_FW_CMD_RESULT_CRYPTOGRAPHIC_ERROR … #define PN544_FW_CMD_RESULT_VERSION_CONDITIONS_ERROR … #define PN544_FW_CMD_RESULT_MEMORY_ERROR … #define PN544_FW_CMD_RESULT_CHUNK_OK … #define PN544_FW_CMD_RESULT_WRITE_FAILED … #define PN544_FW_CMD_RESULT_COMMAND_REJECTED … #define PN544_FW_CMD_RESULT_CHUNK_ERROR … #define PN544_FW_WRITE_BUFFER_MAX_LEN … #define PN544_FW_I2C_MAX_PAYLOAD … #define PN544_FW_I2C_WRITE_FRAME_HEADER_LEN … #define PN544_FW_I2C_WRITE_DATA_MAX_LEN … #define PN544_FW_SECURE_CHUNK_WRITE_HEADER_LEN … #define PN544_FW_SECURE_CHUNK_WRITE_DATA_MAX_LEN … #define PN544_FW_SECURE_FRAME_HEADER_LEN … #define PN544_FW_SECURE_BLOB_HEADER_LEN … #define FW_WORK_STATE_IDLE … #define FW_WORK_STATE_START … #define FW_WORK_STATE_WAIT_WRITE_ANSWER … #define FW_WORK_STATE_WAIT_CHECK_ANSWER … #define FW_WORK_STATE_WAIT_SECURE_WRITE_ANSWER … struct pn544_i2c_phy { … }; #define I2C_DUMP_SKB(info, skb) … static void pn544_hci_i2c_platform_init(struct pn544_i2c_phy *phy) { … } static void pn544_hci_i2c_enable_mode(struct pn544_i2c_phy *phy, int run_mode) { … } static int pn544_hci_i2c_enable(void *phy_id) { … } static void pn544_hci_i2c_disable(void *phy_id) { … } static void pn544_hci_i2c_add_len_crc(struct sk_buff *skb) { … } static void pn544_hci_i2c_remove_len_crc(struct sk_buff *skb) { … } /* * Writing a frame must not return the number of written bytes. * It must return either zero for success, or <0 for error. * In addition, it must not alter the skb */ static int pn544_hci_i2c_write(void *phy_id, struct sk_buff *skb) { … } static int check_crc(u8 *buf, int buflen) { … } /* * Reads an shdlc frame and returns it in a newly allocated sk_buff. Guarantees * that i2c bus will be flushed and that next read will start on a new frame. * returned skb contains only LLC header and payload. * returns: * -EREMOTEIO : i2c read error (fatal) * -EBADMSG : frame was incorrect and discarded * -ENOMEM : cannot allocate skb, frame dropped */ static int pn544_hci_i2c_read(struct pn544_i2c_phy *phy, struct sk_buff **skb) { … } static int pn544_hci_i2c_fw_read_status(struct pn544_i2c_phy *phy) { … } /* * Reads an shdlc frame from the chip. This is not as straightforward as it * seems. There are cases where we could loose the frame start synchronization. * The frame format is len-data-crc, and corruption can occur anywhere while * transiting on i2c bus, such that we could read an invalid len. * In order to recover synchronization with the next frame, we must be sure * to read the real amount of data without using the len byte. We do this by * assuming the following: * - the chip will always present only one single complete frame on the bus * before triggering the interrupt * - the chip will not present a new frame until we have completely read * the previous one (or until we have handled the interrupt). * The tricky case is when we read a corrupted len that is less than the real * len. We must detect this here in order to determine that we need to flush * the bus. This is the reason why we check the crc here. */ static irqreturn_t pn544_hci_i2c_irq_thread_fn(int irq, void *phy_id) { … } static const struct nfc_phy_ops i2c_phy_ops = …; static int pn544_hci_i2c_fw_download(void *phy_id, const char *firmware_name, u8 hw_variant) { … } static void pn544_hci_i2c_fw_work_complete(struct pn544_i2c_phy *phy, int result) { … } static int pn544_hci_i2c_fw_write_cmd(struct i2c_client *client, u32 dest_addr, const u8 *data, u16 datalen) { … } static int pn544_hci_i2c_fw_check_cmd(struct i2c_client *client, u32 start_addr, const u8 *data, u16 datalen) { … } static int pn544_hci_i2c_fw_write_chunk(struct pn544_i2c_phy *phy) { … } static int pn544_hci_i2c_fw_secure_write_frame_cmd(struct pn544_i2c_phy *phy, const u8 *data, u16 datalen) { … } static int pn544_hci_i2c_fw_secure_write_frame(struct pn544_i2c_phy *phy) { … } static void pn544_hci_i2c_fw_work(struct work_struct *work) { … } static const struct acpi_gpio_params enable_gpios = …; static const struct acpi_gpio_params firmware_gpios = …; static const struct acpi_gpio_mapping acpi_pn544_gpios[] = …; static int pn544_hci_i2c_probe(struct i2c_client *client) { … } static void pn544_hci_i2c_remove(struct i2c_client *client) { … } static const struct of_device_id of_pn544_i2c_match[] __maybe_unused = …; MODULE_DEVICE_TABLE(of, of_pn544_i2c_match); static struct i2c_driver pn544_hci_i2c_driver = …; module_i2c_driver(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…);
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