platform/x86: wmi: Remove custom EC address space handler

The custom EC address space handler in the WMI driver was only needed
because the EC driver did not install its address space handler for
EC operation regions beyond the EC device scope in the ACPI namespace.

That has just changed, so the custom EC address handler is not needed
any more and it can be removed.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Armin Wolf <W_Armin@gmx.de>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/wmi.c

@@ -1153,77 +1153,6 @@ static int parse_wdg(struct device *wmi_bus_dev, struct platform_device *pdev)
 	return 0;
 }
 
-static int ec_read_multiple(u8 address, u8 *buffer, size_t bytes)
-{
-	size_t i;
-	int ret;
-
-	for (i = 0; i < bytes; i++) {
-		ret = ec_read(address + i, &buffer[i]);
-		if (ret < 0)
-			return ret;
-	}
-
-	return 0;
-}
-
-static int ec_write_multiple(u8 address, u8 *buffer, size_t bytes)
-{
-	size_t i;
-	int ret;
-
-	for (i = 0; i < bytes; i++) {
-		ret = ec_write(address + i, buffer[i]);
-		if (ret < 0)
-			return ret;
-	}
-
-	return 0;
-}
-
-/*
- * WMI can have EmbeddedControl access regions. In which case, we just want to
- * hand these off to the EC driver.
- */
-static acpi_status
-acpi_wmi_ec_space_handler(u32 function, acpi_physical_address address,
-			  u32 bits, u64 *value,
-			  void *handler_context, void *region_context)
-{
-	int bytes = bits / BITS_PER_BYTE;
-	int ret;
-
-	if (!value)
-		return AE_NULL_ENTRY;
-
-	if (!bytes || bytes > sizeof(*value))
-		return AE_BAD_PARAMETER;
-
-	if (address > U8_MAX || address + bytes - 1 > U8_MAX)
-		return AE_BAD_PARAMETER;
-
-	if (function != ACPI_READ && function != ACPI_WRITE)
-		return AE_BAD_PARAMETER;
-
-	if (function == ACPI_READ)
-		ret = ec_read_multiple(address, (u8 *)value, bytes);
-	else
-		ret = ec_write_multiple(address, (u8 *)value, bytes);
-
-	switch (ret) {
-	case -EINVAL:
-		return AE_BAD_PARAMETER;
-	case -ENODEV:
-		return AE_NOT_FOUND;
-	case -ETIME:
-		return AE_TIME;
-	case 0:
-		return AE_OK;
-	default:
-		return AE_ERROR;
-	}
-}
-
 static int wmi_get_notify_data(struct wmi_block *wblock, union acpi_object **obj)
 {
 	struct acpi_buffer data = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -1338,14 +1267,6 @@ static void acpi_wmi_remove_notify_handler(void *data)
 	acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY, acpi_wmi_notify_handler);
 }
 
-static void acpi_wmi_remove_address_space_handler(void *data)
-{
-	struct acpi_device *acpi_device = data;
-
-	acpi_remove_address_space_handler(acpi_device->handle, ACPI_ADR_SPACE_EC,
-					  &acpi_wmi_ec_space_handler);
-}
-
 static void acpi_wmi_remove_bus_device(void *data)
 {
 	struct device *wmi_bus_dev = data;
@@ -1377,19 +1298,6 @@ static int acpi_wmi_probe(struct platform_device *device)
 
 	dev_set_drvdata(&device->dev, wmi_bus_dev);
 
-	status = acpi_install_address_space_handler(acpi_device->handle,
-						    ACPI_ADR_SPACE_EC,
-						    &acpi_wmi_ec_space_handler,
-						    NULL, NULL);
-	if (ACPI_FAILURE(status)) {
-		dev_err(&device->dev, "Error installing EC region handler\n");
-		return -ENODEV;
-	}
-	error = devm_add_action_or_reset(&device->dev, acpi_wmi_remove_address_space_handler,
-					 acpi_device);
-	if (error < 0)
-		return error;
-
 	status = acpi_install_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY,
 					     acpi_wmi_notify_handler, wmi_bus_dev);
 	if (ACPI_FAILURE(status)) {