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

#include "config.h"

#include <fwupdplugin.h>

#include <linux/hidraw.h>
#include <sys/ioctl.h>

#include "fu-wacom-common.h"
#include "fu-wacom-device.h"

typedef struct {
	guint flash_block_size;
	guint32 flash_base_addr;
	guint32 flash_size;
} FuWacomDevicePrivate;

G_DEFINE_TYPE_WITH_PRIVATE(FuWacomDevice, fu_wacom_device, FU_TYPE_UDEV_DEVICE)

#define GET_PRIVATE(o) (fu_wacom_device_get_instance_private(o))

#define FU_WACOM_DEVICE_IOCTL_TIMEOUT 5000 /* ms */

static void
fu_wacom_device_to_string(FuDevice *device, guint idt, GString *str)
{
	FuWacomDevice *self = FU_WACOM_DEVICE(device);
	FuWacomDevicePrivate *priv = GET_PRIVATE(self);

	/* FuUdevDevice->to_string */
	FU_DEVICE_CLASS(fu_wacom_device_parent_class)->to_string(device, idt, str);

	fu_string_append_kx(str, idt, "FlashBlockSize", priv->flash_block_size);
	fu_string_append_kx(str, idt, "FlashBaseAddr", priv->flash_base_addr);
	fu_string_append_kx(str, idt, "FlashSize", priv->flash_size);
}

gsize
fu_wacom_device_get_block_sz(FuWacomDevice *self)
{
	FuWacomDevicePrivate *priv = GET_PRIVATE(self);
	return priv->flash_block_size;
}

guint
fu_wacom_device_get_base_addr(FuWacomDevice *self)
{
	FuWacomDevicePrivate *priv = GET_PRIVATE(self);
	return priv->flash_base_addr;
}

gboolean
fu_wacom_device_check_mpu(FuWacomDevice *self, GError **error)
{
	FuWacomRawRequest req = {.cmd = FU_WACOM_RAW_BL_CMD_GET_MPUTYPE,
				 .echo = FU_WACOM_RAW_ECHO_DEFAULT,
				 0x00};
	FuWacomRawResponse rsp = {0x00};
	if (!fu_wacom_device_cmd(FU_WACOM_DEVICE(self),
				 &req,
				 &rsp,
				 0,
				 FU_WACOM_DEVICE_CMD_FLAG_NO_ERROR_CHECK,
				 error)) {
		g_prefix_error(error, "failed to get MPU type: ");
		return FALSE;
	}

	/* W9013 */
	if (rsp.resp == 0x2e) {
		fu_device_add_instance_id_full(FU_DEVICE(self),
					       "WacomEMR_W9013",
					       FU_DEVICE_INSTANCE_FLAG_ONLY_QUIRKS);
		return TRUE;
	}

	/* W9021 */
	if (rsp.resp == 0x45) {
		fu_device_add_instance_id_full(FU_DEVICE(self),
					       "WacomEMR_W9021",
					       FU_DEVICE_INSTANCE_FLAG_ONLY_QUIRKS);
		return TRUE;
	}

	/* unsupported */
	g_set_error(error,
		    G_IO_ERROR,
		    G_IO_ERROR_FAILED,
		    "MPU is not W9013 or W9021: 0x%x",
		    rsp.resp);
	return FALSE;
}

static gboolean
fu_wacom_device_probe(FuDevice *device, GError **error)
{
	/* set the physical ID */
	return fu_udev_device_set_physical_id(FU_UDEV_DEVICE(device), "hid", error);
}

static gboolean
fu_wacom_device_detach(FuDevice *device, FuProgress *progress, GError **error)
{
	FuWacomDevice *self = FU_WACOM_DEVICE(device);
	guint8 buf[FU_WACOM_RAW_FW_REPORT_SZ] = {
	    FU_WACOM_RAW_FW_REPORT_ID,
	    FU_WACOM_RAW_FW_CMD_DETACH,
	};
	if (fu_device_has_flag(device, FWUPD_DEVICE_FLAG_IS_BOOTLOADER)) {
		g_debug("already in bootloader mode, skipping");
		return TRUE;
	}
	if (!fu_wacom_device_set_feature(self, buf, sizeof(buf), error)) {
		g_prefix_error(error, "failed to switch to bootloader mode: ");
		return FALSE;
	}
	g_usleep(300 * 1000);
	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_IS_BOOTLOADER);
	return TRUE;
}

static gboolean
fu_wacom_device_check_mode(FuWacomDevice *self, GError **error)
{
	FuWacomRawRequest req = {.cmd = FU_WACOM_RAW_BL_CMD_CHECK_MODE,
				 .echo = FU_WACOM_RAW_ECHO_DEFAULT,
				 0x00};
	FuWacomRawResponse rsp = {0x00};
	if (!fu_wacom_device_cmd(self,
				 &req,
				 &rsp,
				 0,
				 FU_WACOM_DEVICE_CMD_FLAG_NO_ERROR_CHECK,
				 error)) {
		g_prefix_error(error, "failed to check mode: ");
		return FALSE;
	}
	if (rsp.resp != 0x06) {
		g_set_error(error,
			    G_IO_ERROR,
			    G_IO_ERROR_FAILED,
			    "check mode failed, mode=0x%02x",
			    rsp.resp);
		return FALSE;
	}
	return TRUE;
}

static gboolean
fu_wacom_device_set_version_bootloader(FuWacomDevice *self, GError **error)
{
	FuWacomRawRequest req = {.cmd = FU_WACOM_RAW_BL_CMD_GET_BLVER,
				 .echo = FU_WACOM_RAW_ECHO_DEFAULT,
				 0x00};
	FuWacomRawResponse rsp = {0x00};
	g_autofree gchar *version = NULL;
	if (!fu_wacom_device_cmd(self,
				 &req,
				 &rsp,
				 0,
				 FU_WACOM_DEVICE_CMD_FLAG_NO_ERROR_CHECK,
				 error)) {
		g_prefix_error(error, "failed to get bootloader version: ");
		return FALSE;
	}
	version = g_strdup_printf("%u", rsp.resp);
	fu_device_set_version_bootloader(FU_DEVICE(self), version);
	return TRUE;
}

static gboolean
fu_wacom_device_write_firmware(FuDevice *device,
			       FuFirmware *firmware,
			       FuProgress *progress,
			       FwupdInstallFlags flags,
			       GError **error)
{
	FuWacomDevice *self = FU_WACOM_DEVICE(device);
	FuWacomDevicePrivate *priv = GET_PRIVATE(self);
	FuWacomDeviceClass *klass = FU_WACOM_DEVICE_GET_CLASS(device);
	g_autoptr(GBytes) fw = NULL;
	g_autoptr(GPtrArray) chunks = NULL;

	/* use the correct image from the firmware */
	g_debug("using element at addr 0x%0x", (guint)fu_firmware_get_addr(firmware));

	/* check start address and size */
	if (fu_firmware_get_addr(firmware) != priv->flash_base_addr) {
		g_set_error(error,
			    G_IO_ERROR,
			    G_IO_ERROR_FAILED,
			    "base addr invalid: 0x%05x",
			    (guint)fu_firmware_get_addr(firmware));
		return FALSE;
	}
	fw = fu_firmware_get_bytes(firmware, error);
	if (fw == NULL)
		return FALSE;
	if (g_bytes_get_size(fw) > priv->flash_size) {
		g_set_error(error,
			    G_IO_ERROR,
			    G_IO_ERROR_FAILED,
			    "size is invalid: 0x%05x",
			    (guint)g_bytes_get_size(fw));
		return FALSE;
	}

	/* we're in bootloader mode now */
	if (!fu_wacom_device_check_mode(self, error))
		return FALSE;
	if (!fu_wacom_device_set_version_bootloader(self, error))
		return FALSE;

	/* flash chunks */
	chunks = fu_chunk_array_new_from_bytes(fw,
					       priv->flash_base_addr,
					       0x00, /* page_sz */
					       priv->flash_block_size);
	return klass->write_firmware(device, chunks, progress, error);
}

gboolean
fu_wacom_device_set_feature(FuWacomDevice *self, const guint8 *data, guint datasz, GError **error)
{
	fu_dump_raw(G_LOG_DOMAIN, "SetFeature", data, datasz);
	return fu_udev_device_ioctl(FU_UDEV_DEVICE(self),
				    HIDIOCSFEATURE(datasz),
				    (guint8 *)data,
				    NULL,
				    FU_WACOM_DEVICE_IOCTL_TIMEOUT,
				    error);
}

gboolean
fu_wacom_device_get_feature(FuWacomDevice *self, guint8 *data, guint datasz, GError **error)
{
	if (!fu_udev_device_ioctl(FU_UDEV_DEVICE(self),
				  HIDIOCGFEATURE(datasz),
				  data,
				  NULL,
				  FU_WACOM_DEVICE_IOCTL_TIMEOUT,
				  error))
		return FALSE;
	fu_dump_raw(G_LOG_DOMAIN, "GetFeature", data, datasz);
	return TRUE;
}

gboolean
fu_wacom_device_cmd(FuWacomDevice *self,
		    FuWacomRawRequest *req,
		    FuWacomRawResponse *rsp,
		    gulong delay_us,
		    FuWacomDeviceCmdFlags flags,
		    GError **error)
{
	req->report_id = FU_WACOM_RAW_BL_REPORT_ID_SET;
	if (!fu_wacom_device_set_feature(self, (const guint8 *)req, sizeof(*req), error)) {
		g_prefix_error(error, "failed to send: ");
		return FALSE;
	}
	if (delay_us > 0)
		g_usleep(delay_us);
	rsp->report_id = FU_WACOM_RAW_BL_REPORT_ID_GET;
	if (!fu_wacom_device_get_feature(self, (guint8 *)rsp, sizeof(*rsp), error)) {
		g_prefix_error(error, "failed to receive: ");
		return FALSE;
	}
	if (flags & FU_WACOM_DEVICE_CMD_FLAG_NO_ERROR_CHECK)
		return TRUE;
	if (!fu_wacom_common_check_reply(req, rsp, error))
		return FALSE;

	/* wait for the command to complete */
	if (flags & FU_WACOM_DEVICE_CMD_FLAG_POLL_ON_WAITING && rsp->resp != FU_WACOM_RAW_RC_OK) {
		for (guint i = 0; i < FU_WACOM_RAW_CMD_RETRIES; i++) {
			if (delay_us > 0)
				g_usleep(delay_us);
			if (!fu_wacom_device_get_feature(self, (guint8 *)rsp, sizeof(*rsp), error))
				return FALSE;
			if (!fu_wacom_common_check_reply(req, rsp, error))
				return FALSE;
			if (rsp->resp != FU_WACOM_RAW_RC_IN_PROGRESS &&
			    rsp->resp != FU_WACOM_RAW_RC_BUSY)
				break;
		}
	}
	return fu_wacom_common_rc_set_error(rsp, error);
}

static gboolean
fu_wacom_device_set_quirk_kv(FuDevice *device, const gchar *key, const gchar *value, GError **error)
{
	FuWacomDevice *self = FU_WACOM_DEVICE(device);
	FuWacomDevicePrivate *priv = GET_PRIVATE(self);
	guint64 tmp = 0;

	if (g_strcmp0(key, "WacomI2cFlashBlockSize") == 0) {
		if (!fu_strtoull(value, &tmp, 0, G_MAXSIZE, error))
			return FALSE;
		priv->flash_block_size = tmp;
		return TRUE;
	}
	if (g_strcmp0(key, "WacomI2cFlashBaseAddr") == 0) {
		if (!fu_strtoull(value, &tmp, 0, G_MAXUINT32, error))
			return FALSE;
		priv->flash_base_addr = tmp;
		return TRUE;
	}
	if (g_strcmp0(key, "WacomI2cFlashSize") == 0) {
		if (!fu_strtoull(value, &tmp, 0, G_MAXUINT32, error))
			return FALSE;
		priv->flash_size = tmp;
		return TRUE;
	}
	g_set_error_literal(error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED, "quirk key not supported");
	return FALSE;
}

static void
fu_wacom_device_set_progress(FuDevice *self, FuProgress *progress)
{
	fu_progress_set_id(progress, G_STRLOC);
	fu_progress_add_flag(progress, FU_PROGRESS_FLAG_GUESSED);
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_RESTART, 0, "detach");
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_WRITE, 98, "write");
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_RESTART, 0, "attach");
	fu_progress_add_step(progress, FWUPD_STATUS_DEVICE_BUSY, 2, "reload");
}

static void
fu_wacom_device_init(FuWacomDevice *self)
{
	fu_device_add_protocol(FU_DEVICE(self), "com.wacom.raw");
	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_UPDATABLE);
	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_INTERNAL);
	fu_device_add_flag(FU_DEVICE(self), FWUPD_DEVICE_FLAG_UNSIGNED_PAYLOAD);
	fu_device_add_internal_flag(FU_DEVICE(self), FU_DEVICE_INTERNAL_FLAG_REPLUG_MATCH_GUID);
	fu_device_set_version_format(FU_DEVICE(self), FWUPD_VERSION_FORMAT_PAIR);
	fu_device_set_firmware_gtype(FU_DEVICE(self), FU_TYPE_IHEX_FIRMWARE);
}

static void
fu_wacom_device_class_init(FuWacomDeviceClass *klass)
{
	FuDeviceClass *klass_device = FU_DEVICE_CLASS(klass);
	klass_device->to_string = fu_wacom_device_to_string;
	klass_device->write_firmware = fu_wacom_device_write_firmware;
	klass_device->detach = fu_wacom_device_detach;
	klass_device->set_quirk_kv = fu_wacom_device_set_quirk_kv;
	klass_device->probe = fu_wacom_device_probe;
	klass_device->set_progress = fu_wacom_device_set_progress;
}