// SPDX-License-Identifier: GPL-2.0-or-later /* * Goodix GT7986U SPI Driver Code for HID. * * Copyright (C) 2024 Godix, Inc. */ #include <linux/unaligned.h> #include <linux/delay.h> #include <linux/hid.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/sizes.h> #include <linux/spi/spi.h> #define GOODIX_DEV_CONFIRM_ADDR … #define GOODIX_HID_DESC_ADDR … #define GOODIX_HID_REPORT_DESC_ADDR … #define GOODIX_HID_SIGN_ADDR … #define GOODIX_HID_GET_REPORT_CMD … #define GOODIX_HID_SET_REPORT_CMD … #define GOODIX_HID_MAX_INBUF_SIZE … #define GOODIX_HID_ACK_READY_FLAG … #define GOODIX_HID_REPORT_READY_FLAG … #define GOODIX_DEV_CONFIRM_VAL … #define GOODIX_SPI_WRITE_FLAG … #define GOODIX_SPI_READ_FLAG … #define GOODIX_SPI_TRANS_PREFIX_LEN … #define GOODIX_REGISTER_WIDTH … #define GOODIX_SPI_READ_DUMMY_LEN … #define GOODIX_SPI_READ_PREFIX_LEN … #define GOODIX_SPI_WRITE_PREFIX_LEN … #define GOODIX_CHECKSUM_SIZE … #define GOODIX_NORMAL_RESET_DELAY_MS … struct goodix_hid_report_header { … } __packed; #define GOODIX_HID_ACK_HEADER_SIZE … struct goodix_hid_report_package { … }; #define GOODIX_HID_PKG_LEN_SIZE … #define GOODIX_HID_COOR_DATA_LEN … #define GOODIX_HID_COOR_PKG_LEN … /* power state */ #define GOODIX_SPI_POWER_ON … #define GOODIX_SPI_POWER_SLEEP … /* flags used to record the current device operating state */ #define GOODIX_HID_STARTED … struct goodix_hid_report_event { … } __packed; struct goodix_hid_desc { … } __packed; struct goodix_ts_data { … }; static void *goodix_get_event_report(struct goodix_ts_data *ts, u32 addr, u8 *data, size_t len) { … } static int goodix_spi_read(struct goodix_ts_data *ts, u32 addr, void *data, size_t len) { … } static int goodix_spi_write(struct goodix_ts_data *ts, u32 addr, const void *data, size_t len) { … } static int goodix_dev_confirm(struct goodix_ts_data *ts) { … } /** * goodix_hid_parse() - hid-core .parse() callback * @hid: hid device instance * * This function gets called during call to hid_add_device * * Return: 0 on success and non zero on error */ static int goodix_hid_parse(struct hid_device *hid) { … } static int goodix_hid_get_report_length(struct hid_report *report) { … } static void goodix_hid_find_max_report(struct hid_device *hid, unsigned int type, unsigned int *max) { … } static int goodix_hid_start(struct hid_device *hid) { … } static void goodix_hid_stop(struct hid_device *hid) { … } static int goodix_hid_open(struct hid_device *hid) { … } static void goodix_hid_close(struct hid_device *hid) { … } /* Return date length of response data */ static int goodix_hid_check_ack_status(struct goodix_ts_data *ts, u32 *resp_len) { … } /** * goodix_hid_get_raw_report() - Process hidraw GET REPORT operation * @hid: hid device instance * @reportnum: Report ID * @buf: Buffer for store the report date * @len: Length fo report data * @report_type: Report type * * The function for hid_ll_driver.get_raw_report to handle the HIDRAW ioctl * get report request. The transmitted data follows the standard i2c-hid * protocol with a specified header. * * Return: The length of the data in the buf on success, negative error code */ static int goodix_hid_get_raw_report(struct hid_device *hid, unsigned char reportnum, u8 *buf, size_t len, unsigned char report_type) { … } /** * goodix_hid_set_raw_report() - process hidraw SET REPORT operation * @hid: HID device * @reportnum: Report ID * @buf: Buffer for communication * @len: Length of data in the buffer * @report_type: Report type * * The function for hid_ll_driver.get_raw_report to handle the HIDRAW ioctl * set report request. The transmitted data follows the standard i2c-hid * protocol with a specified header. * * Return: The length of the data sent, negative error code on failure */ static int goodix_hid_set_raw_report(struct hid_device *hid, unsigned char reportnum, __u8 *buf, size_t len, unsigned char report_type) { … } static int goodix_hid_raw_request(struct hid_device *hid, unsigned char reportnum, __u8 *buf, size_t len, unsigned char rtype, int reqtype) { … } static struct hid_ll_driver goodix_hid_ll_driver = …; static irqreturn_t goodix_hid_irq(int irq, void *data) { … } static int goodix_hid_init(struct goodix_ts_data *ts) { … } static int goodix_spi_probe(struct spi_device *spi) { … } static void goodix_spi_remove(struct spi_device *spi) { … } static int goodix_spi_set_power(struct goodix_ts_data *ts, int power_state) { … } static int goodix_spi_suspend(struct device *dev) { … } static int goodix_spi_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(goodix_spi_pm_ops, goodix_spi_suspend, goodix_spi_resume); #ifdef CONFIG_ACPI static const struct acpi_device_id goodix_spi_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, goodix_spi_acpi_match); #endif static const struct spi_device_id goodix_spi_ids[] = …; MODULE_DEVICE_TABLE(spi, goodix_spi_ids); static struct spi_driver goodix_spi_driver = …; module_spi_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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