// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2023, Intel Corporation. * Intel Visual Sensing Controller Transport Layer Linux driver */ #include <linux/acpi.h> #include <linux/cleanup.h> #include <linux/crc32.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/irq.h> #include <linux/irqreturn.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/platform_device.h> #include <linux/spi/spi.h> #include <linux/types.h> #include "vsc-tp.h" #define VSC_TP_RESET_PIN_TOGGLE_INTERVAL_MS … #define VSC_TP_ROM_BOOTUP_DELAY_MS … #define VSC_TP_ROM_XFER_POLL_TIMEOUT_US … #define VSC_TP_ROM_XFER_POLL_DELAY_US … #define VSC_TP_WAIT_FW_POLL_TIMEOUT … #define VSC_TP_WAIT_FW_POLL_DELAY_US … #define VSC_TP_MAX_XFER_COUNT … #define VSC_TP_PACKET_SYNC … #define VSC_TP_CRC_SIZE … #define VSC_TP_MAX_MSG_SIZE … /* SPI xfer timeout size */ #define VSC_TP_XFER_TIMEOUT_BYTES … #define VSC_TP_PACKET_PADDING_SIZE … #define VSC_TP_PACKET_SIZE(pkt) … #define VSC_TP_MAX_PACKET_SIZE … #define VSC_TP_MAX_XFER_SIZE … #define VSC_TP_NEXT_XFER_LEN(len, offset) … struct vsc_tp_packet { … }; struct vsc_tp { … }; /* GPIO resources */ static const struct acpi_gpio_params wakeuphost_gpio = …; static const struct acpi_gpio_params wakeuphostint_gpio = …; static const struct acpi_gpio_params resetfw_gpio = …; static const struct acpi_gpio_params wakeupfw = …; static const struct acpi_gpio_mapping vsc_tp_acpi_gpios[] = …; static irqreturn_t vsc_tp_isr(int irq, void *data) { … } static irqreturn_t vsc_tp_thread_isr(int irq, void *data) { … } /* wakeup firmware and wait for response */ static int vsc_tp_wakeup_request(struct vsc_tp *tp) { … } static void vsc_tp_wakeup_release(struct vsc_tp *tp) { … } static int vsc_tp_dev_xfer(struct vsc_tp *tp, void *obuf, void *ibuf, size_t len) { … } static int vsc_tp_xfer_helper(struct vsc_tp *tp, struct vsc_tp_packet *pkt, void *ibuf, u16 ilen) { … } /** * vsc_tp_xfer - transfer data to firmware * @tp: vsc_tp device handle * @cmd: the command to be sent to the device * @obuf: the tx buffer to be sent to the device * @olen: the length of tx buffer * @ibuf: the rx buffer to receive from the device * @ilen: the length of rx buffer * Return: the length of received data in case of success, * otherwise negative value */ int vsc_tp_xfer(struct vsc_tp *tp, u8 cmd, const void *obuf, size_t olen, void *ibuf, size_t ilen) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_rom_xfer - transfer data to rom code * @tp: vsc_tp device handle * @obuf: the data buffer to be sent to the device * @ibuf: the buffer to receive data from the device * @len: the length of tx buffer and rx buffer * Return: 0 in case of success, negative value in case of error */ int vsc_tp_rom_xfer(struct vsc_tp *tp, const void *obuf, void *ibuf, size_t len) { … } /** * vsc_tp_reset - reset vsc transport layer * @tp: vsc_tp device handle */ void vsc_tp_reset(struct vsc_tp *tp) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_need_read - check if device has data to sent * @tp: vsc_tp device handle * Return: true if device has data to sent, otherwise false */ bool vsc_tp_need_read(struct vsc_tp *tp) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_register_event_cb - register a callback function to receive event * @tp: vsc_tp device handle * @event_cb: callback function * @context: execution context of event callback * Return: 0 in case of success, negative value in case of error */ int vsc_tp_register_event_cb(struct vsc_tp *tp, vsc_tp_event_cb_t event_cb, void *context) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_request_irq - request irq for vsc_tp device * @tp: vsc_tp device handle */ int vsc_tp_request_irq(struct vsc_tp *tp) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_free_irq - free irq for vsc_tp device * @tp: vsc_tp device handle */ void vsc_tp_free_irq(struct vsc_tp *tp) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_intr_synchronize - synchronize vsc_tp interrupt * @tp: vsc_tp device handle */ void vsc_tp_intr_synchronize(struct vsc_tp *tp) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_intr_enable - enable vsc_tp interrupt * @tp: vsc_tp device handle */ void vsc_tp_intr_enable(struct vsc_tp *tp) { … } EXPORT_SYMBOL_NS_GPL(…); /** * vsc_tp_intr_disable - disable vsc_tp interrupt * @tp: vsc_tp device handle */ void vsc_tp_intr_disable(struct vsc_tp *tp) { … } EXPORT_SYMBOL_NS_GPL(…); static int vsc_tp_match_any(struct acpi_device *adev, void *data) { … } static int vsc_tp_probe(struct spi_device *spi) { … } static void vsc_tp_remove(struct spi_device *spi) { … } static void vsc_tp_shutdown(struct spi_device *spi) { … } static const struct acpi_device_id vsc_tp_acpi_ids[] = …; MODULE_DEVICE_TABLE(acpi, vsc_tp_acpi_ids); static struct spi_driver vsc_tp_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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