/*
 * Copyright (C) 2018 Richard Hughes <richard@hughsie.com>
 *
 * SPDX-License-Identifier: LGPL-2.1+
 */

#include "config.h"

#include <string.h>

#include "fu-rts54hub-device.h"

struct _FuRts54HubDevice {
	FuUsbDevice parent_instance;
	gboolean fw_auth;
	gboolean dual_bank;
	gboolean running_on_flash;
	guint8 vendor_cmd;
};

G_DEFINE_TYPE(FuRts54HubDevice, fu_rts54hub_device, FU_TYPE_USB_DEVICE)

#define FU_RTS54HUB_DEVICE_TIMEOUT	 1000  /* ms */
#define FU_RTS54HUB_DEVICE_TIMEOUT_RW	 1000  /* ms */
#define FU_RTS54HUB_DEVICE_TIMEOUT_ERASE 5000  /* ms */
#define FU_RTS54HUB_DEVICE_TIMEOUT_AUTH	 10000 /* ms */
#define FU_RTS54HUB_DEVICE_BLOCK_SIZE	 4096
#define FU_RTS54HUB_DEVICE_STATUS_LEN	 25

#define FU_RTS54HUB_I2C_CONFIG_REQUEST 0xF6
#define FU_RTS54HUB_I2C_WRITE_REQUEST  0xC6
#define FU_RTS54HUB_I2C_READ_REQUEST   0xD6

typedef enum {
	FU_RTS54HUB_VENDOR_CMD_NONE = 0x00,
	FU_RTS54HUB_VENDOR_CMD_STATUS = 1 << 0,
	FU_RTS54HUB_VENDOR_CMD_FLASH = 1 << 1,
} FuRts54HubVendorCmd;

static void
fu_rts54hub_device_to_string(FuDevice *device, guint idt, GString *str)
{
	FuRts54HubDevice *self = FU_RTS54HUB_DEVICE(device);
	fu_string_append_kb(str, idt, "FwAuth", self->fw_auth);
	fu_string_append_kb(str, idt, "DualBank", self->dual_bank);
	fu_string_append_kb(str, idt, "RunningOnFlash", self->running_on_flash);
}

gboolean
fu_rts54hub_device_i2c_config(FuRts54HubDevice *self,
			      guint8 target_addr,
			      guint8 sub_length,
			      FuRts54HubI2cSpeed speed,
			      GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	guint16 value = 0;
	guint16 index = 0x8080;

	value = ((guint16)target_addr << 8) | sub_length;
	index += speed;
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   FU_RTS54HUB_I2C_CONFIG_REQUEST,
					   value, /* value */
					   index, /* idx */
					   NULL,
					   0,	 /* data */
					   NULL, /* actual */
					   FU_RTS54HUB_DEVICE_TIMEOUT,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to issue i2c Conf cmd 0x%02x: ", target_addr);
		return FALSE;
	}
	return TRUE;
}

gboolean
fu_rts54hub_device_i2c_write(FuRts54HubDevice *self,
			     guint32 sub_addr,
			     const guint8 *data,
			     gsize datasz,
			     GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	g_autofree guint8 *datarw = fu_memdup_safe(data, datasz, error);
	if (datarw == NULL)
		return FALSE;
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   FU_RTS54HUB_I2C_WRITE_REQUEST,
					   sub_addr, /* value */
					   0x0000,   /* idx */
					   datarw,
					   datasz, /* data */
					   NULL,
					   FU_RTS54HUB_DEVICE_TIMEOUT,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to write I2C: ");
		return FALSE;
	}
	return TRUE;
}

gboolean
fu_rts54hub_device_i2c_read(FuRts54HubDevice *self,
			    guint32 sub_addr,
			    guint8 *data,
			    gsize datasz,
			    GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_DEVICE_TO_HOST,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   FU_RTS54HUB_I2C_READ_REQUEST,
					   0x0000,
					   sub_addr,
					   data,
					   datasz,
					   NULL,
					   FU_RTS54HUB_DEVICE_TIMEOUT,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to read I2C: ");
		return FALSE;
	}
	return TRUE;
}

static gboolean
fu_rts54hub_device_highclockmode(FuRts54HubDevice *self, guint16 value, GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   0x06,  /* request */
					   value, /* value */
					   0,	  /* idx */
					   NULL,
					   0,	 /* data */
					   NULL, /* actual */
					   FU_RTS54HUB_DEVICE_TIMEOUT,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to set highclockmode: ");
		return FALSE;
	}
	return TRUE;
}

static gboolean
fu_rts54hub_device_reset_flash(FuRts54HubDevice *self, GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   0xC0 + 0x29, /* request */
					   0x0,		/* value */
					   0x0,		/* idx */
					   NULL,
					   0,	 /* data */
					   NULL, /* actual */
					   FU_RTS54HUB_DEVICE_TIMEOUT,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to reset flash: ");
		return FALSE;
	}
	return TRUE;
}

static gboolean
fu_rts54hub_device_write_flash(FuRts54HubDevice *self,
			       guint32 addr,
			       const guint8 *data,
			       gsize datasz,
			       GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	gsize actual_len = 0;
	g_autofree guint8 *datarw = NULL;

	/* make mutable */
	datarw = fu_memdup_safe(data, datasz, error);
	if (datarw == NULL)
		return FALSE;

	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   0xC0 + 0x08,	     /* request */
					   addr % (1 << 16), /* value */
					   addr / (1 << 16), /* idx */
					   datarw,
					   datasz, /* data */
					   &actual_len,
					   FU_RTS54HUB_DEVICE_TIMEOUT_RW,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to write flash: ");
		return FALSE;
	}
	if (actual_len != datasz) {
		g_set_error(error,
			    G_IO_ERROR,
			    G_IO_ERROR_INVALID_DATA,
			    "only wrote %" G_GSIZE_FORMAT "bytes",
			    actual_len);
		return FALSE;
	}
	return TRUE;
}

#if 0
static gboolean
fu_rts54hub_device_read_flash (FuRts54HubDevice *self,
			       guint32 addr,
			       guint8 *data,
			       gsize datasz,
			       GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev (FU_USB_DEVICE (self));
	gsize actual_len = 0;
	if (!g_usb_device_control_transfer (usb_device,
					    G_USB_DEVICE_DIRECTION_DEVICE_TO_HOST,
					    G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					    G_USB_DEVICE_RECIPIENT_DEVICE,
					    0xC0 + 0x18,	/* request */
					    addr % (1 << 16),	/* value */
					    addr / (1 << 16),	/* idx */
					    data, datasz,	/* data */
					    &actual_len,
					    FU_RTS54HUB_DEVICE_TIMEOUT_RW,
					    NULL, error)) {
		g_prefix_error (error, "failed to read flash: ");
		return FALSE;
	}
	if (actual_len != datasz) {
		g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_DATA,
			     "only read %" G_GSIZE_FORMAT "bytes", actual_len);
		return FALSE;
	}
	return TRUE;
}
#endif

static gboolean
fu_rts54hub_device_flash_authentication(FuRts54HubDevice *self, GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   0xC0 + 0x19, /* request */
					   0x01,	/* value */
					   0x0,		/* idx */
					   NULL,
					   0,	 /* data */
					   NULL, /* actual */
					   FU_RTS54HUB_DEVICE_TIMEOUT_AUTH,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to authenticate: ");
		return FALSE;
	}
	return TRUE;
}

static gboolean
fu_rts54hub_device_erase_flash(FuRts54HubDevice *self, guint8 erase_type, GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   0xC0 + 0x28,	     /* request */
					   erase_type * 256, /* value */
					   0x0,		     /* idx */
					   NULL,
					   0,	 /* data */
					   NULL, /* actual */
					   FU_RTS54HUB_DEVICE_TIMEOUT_ERASE,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to erase flash: ");
		return FALSE;
	}
	return TRUE;
}

gboolean
fu_rts54hub_device_vendor_cmd(FuRts54HubDevice *self, guint8 value, GError **error)
{
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));

	/* don't set something that's already set */
	if (self->vendor_cmd == value) {
		g_debug("skipping vendor command 0x%02x as already set", value);
		return TRUE;
	}
	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_HOST_TO_DEVICE,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   0x02,   /* request */
					   value,  /* value */
					   0x0bda, /* idx */
					   NULL,
					   0,	 /* data */
					   NULL, /* actual */
					   FU_RTS54HUB_DEVICE_TIMEOUT,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to issue vendor cmd 0x%02x: ", value);
		return FALSE;
	}
	self->vendor_cmd = value;
	return TRUE;
}

static gboolean
fu_rts54hub_device_ensure_status(FuRts54HubDevice *self, GError **error)
{
	guint8 data[FU_RTS54HUB_DEVICE_STATUS_LEN] = {0};
	GUsbDevice *usb_device = fu_usb_device_get_dev(FU_USB_DEVICE(self));
	gsize actual_len = 0;

	if (!g_usb_device_control_transfer(usb_device,
					   G_USB_DEVICE_DIRECTION_DEVICE_TO_HOST,
					   G_USB_DEVICE_REQUEST_TYPE_VENDOR,
					   G_USB_DEVICE_RECIPIENT_DEVICE,
					   0x09, /* request */
					   0x0,	 /* value */
					   0x0,	 /* idx */
					   data,
					   sizeof(data),
					   &actual_len, /* actual */
					   FU_RTS54HUB_DEVICE_TIMEOUT,
					   NULL,
					   error)) {
		g_prefix_error(error, "failed to get status: ");
		return FALSE;
	}
	if (actual_len != FU_RTS54HUB_DEVICE_STATUS_LEN) {
		g_set_error(error,
			    G_IO_ERROR,
			    G_IO_ERROR_INVALID_DATA,
			    "only read %" G_GSIZE_FORMAT "bytes",
			    actual_len);
		return FALSE;
	}

	/* check the hardware capabilities */
	self->dual_bank = (data[7] & 0x80) == 0x80;
	self->fw_auth = (data[13] & 0x02) > 0;
	self->running_on_flash = (data[15] & 0x02) > 0;

	return TRUE;
}

static gboolean
fu_rts54hub_device_setup(FuDevice *device, GError **error)
{
	FuRts54HubDevice *self = FU_RTS54HUB_DEVICE(device);

	/* FuUsbDevice->setup */
	if (!FU_DEVICE_CLASS(fu_rts54hub_device_parent_class)->setup(device, error))
		return FALSE;

	/* check this device is correct */
	if (!fu_rts54hub_device_vendor_cmd(self, FU_RTS54HUB_VENDOR_CMD_STATUS, error)) {
		g_prefix_error(error, "failed to vendor enable: ");
		return FALSE;
	}
	if (!fu_rts54hub_device_ensure_status(self, error))
		return FALSE;

	/* all three conditions must be set */
	if (!self->running_on_flash) {
		fu_device_set_update_error(device, "device is abnormally running from ROM");
	} else if (!self->fw_auth) {
		fu_device_set_update_error(device, "device does not support authentication");
	} else if (!self->dual_bank) {
		fu_device_set_update_error(device, "device does not support dual-bank updating");
	} else {
		fu_device_add_flag(device, FWUPD_DEVICE_FLAG_UPDATABLE);
	}

	/* success */
	return TRUE;
}

static gboolean
fu_rts54hub_device_close(FuDevice *device, GError **error)
{
	FuRts54HubDevice *self = FU_RTS54HUB_DEVICE(device);

	/* disable vendor commands */
	if (self->vendor_cmd != FU_RTS54HUB_VENDOR_CMD_NONE) {
		if (!fu_rts54hub_device_vendor_cmd(self, FU_RTS54HUB_VENDOR_CMD_NONE, error)) {
			g_prefix_error(error, "failed to disable vendor command: ");
			return FALSE;
		}
	}

	/* FuUsbDevice->close */
	return FU_DEVICE_CLASS(fu_rts54hub_device_parent_class)->close(device, error);
}

static gboolean
fu_rts54hub_device_write_firmware(FuDevice *device,
				  FuFirmware *firmware,
				  FuProgress *progress,
				  FwupdInstallFlags flags,
				  GError **error)
{
	FuRts54HubDevice *self = FU_RTS54HUB_DEVICE(device);
	g_autoptr(GBytes) fw = NULL;
	g_autoptr(GPtrArray) chunks = NULL;

	/* progress */
	fu_progress_set_id(progress, G_STRLOC);
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_ERASE, 1, NULL);
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_WRITE, 46, NULL);
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_VERIFY, 52, NULL);
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_RESTART, 1, NULL);

	/* get default image */
	fw = fu_firmware_get_bytes(firmware, error);
	if (fw == NULL)
		return FALSE;

	/* enable vendor commands */
	if (!fu_rts54hub_device_vendor_cmd(self,
					   FU_RTS54HUB_VENDOR_CMD_STATUS |
					       FU_RTS54HUB_VENDOR_CMD_FLASH,
					   error)) {
		g_prefix_error(error, "failed to cmd enable: ");
		return FALSE;
	}

	/* erase spare flash bank only if it is not empty */
	if (!fu_rts54hub_device_erase_flash(self, 1, error))
		return FALSE;
	fu_progress_step_done(progress);

	/* set MCU clock to high clock mode */
	if (!fu_rts54hub_device_highclockmode(self, 0x0001, error)) {
		g_prefix_error(error, "failed to enable MCU clock: ");
		return FALSE;
	}

	/* set SPI controller clock to high clock mode */
	if (!fu_rts54hub_device_highclockmode(self, 0x0101, error)) {
		g_prefix_error(error, "failed to enable SPI clock: ");
		return FALSE;
	}

	/* write each block */
	chunks = fu_chunk_array_new_from_bytes(fw,
					       0x00, /* start addr */
					       0x00, /* page_sz */
					       FU_RTS54HUB_DEVICE_BLOCK_SIZE);
	for (guint i = 0; i < chunks->len; i++) {
		FuChunk *chk = g_ptr_array_index(chunks, i);

		/* write chunk */
		if (!fu_rts54hub_device_write_flash(self,
						    fu_chunk_get_address(chk),
						    fu_chunk_get_data(chk),
						    fu_chunk_get_data_sz(chk),
						    error))
			return FALSE;

		/* update progress */
		fu_progress_set_percentage_full(fu_progress_get_child(progress),
						(gsize)i + 1,
						(gsize)chunks->len);
	}
	fu_progress_step_done(progress);

	/* get device to authenticate the firmware */
	if (!fu_rts54hub_device_flash_authentication(self, error))
		return FALSE;
	fu_progress_step_done(progress);

	/* send software reset to run available flash code */
	if (!fu_rts54hub_device_reset_flash(self, error))
		return FALSE;
	fu_progress_step_done(progress);

	/* don't reset the vendor command enable, the device will be rebooted */
	self->vendor_cmd = FU_RTS54HUB_VENDOR_CMD_NONE;

	/* success! */
	fu_device_add_flag(device, FWUPD_DEVICE_FLAG_WAIT_FOR_REPLUG);
	return TRUE;
}

static FuFirmware *
fu_rts54hub_device_prepare_firmware(FuDevice *device,
				    GBytes *fw,
				    FwupdInstallFlags flags,
				    GError **error)
{
	gsize bufsz = 0;
	guint8 tmp = 0;
	const guint8 *buf = g_bytes_get_data(fw, &bufsz);

	if (!fu_memread_uint8_safe(buf, bufsz, 0x7ef3, &tmp, error))
		return NULL;
	if ((tmp & 0xf0) != 0x80) {
		g_set_error_literal(error,
				    FWUPD_ERROR,
				    FWUPD_ERROR_INVALID_FILE,
				    "firmware needs to be dual bank");
		return NULL;
	}
	return fu_firmware_new_from_bytes(fw);
}

static void
fu_rts54hub_device_set_progress(FuDevice *self, FuProgress *progress)
{
	fu_progress_set_id(progress, G_STRLOC);
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_RESTART, 0, "detach");
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_WRITE, 62, "write");
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_RESTART, 38, "attach");
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_BUSY, 0, "reload");
}

static void
fu_rts54hub_device_init(FuRts54HubDevice *self)
{
	fu_device_add_protocol(FU_DEVICE(self), "com.realtek.rts54");
	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_SIGNED_PAYLOAD);
	fu_device_set_remove_delay(FU_DEVICE(self), FU_DEVICE_REMOVE_DELAY_RE_ENUMERATE);
}

static void
fu_rts54hub_device_class_init(FuRts54HubDeviceClass *klass)
{
	FuDeviceClass *klass_device = FU_DEVICE_CLASS(klass);
	klass_device->write_firmware = fu_rts54hub_device_write_firmware;
	klass_device->setup = fu_rts54hub_device_setup;
	klass_device->to_string = fu_rts54hub_device_to_string;
	klass_device->prepare_firmware = fu_rts54hub_device_prepare_firmware;
	klass_device->close = fu_rts54hub_device_close;
	klass_device->set_progress = fu_rts54hub_device_set_progress;
}
