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Commit a6df7798 authored by Gwendal Grignou's avatar Gwendal Grignou Committed by Benson Leung
Browse files

platform/chrome: cros_ec_lpc: Add MKBP events support over ACPI 



This patch installs a notify handler to process MKBP events for EC
firmware directing them over ACPI.

Signed-off-by: default avatarGwendal Grignou <gwendal@chromium.org>
Signed-off-by: default avatarThierry Escande <thierry.escande@collabora.com>
Signed-off-by: default avatarBenson Leung <bleung@chromium.org>
parent 450de8f4

drivers/platform/chrome/cros_ec_lpc.c

+32 −0
Original line number Diff line number Diff line
@@ -227,9 +227,20 @@ static int cros_ec_lpc_readmem(struct cros_ec_device *ec, unsigned int offset, 
	return cnt;

}



static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data)

{

	struct cros_ec_device *ec_dev = data;



	if (ec_dev->mkbp_event_supported && cros_ec_get_next_event(ec_dev) > 0)

		blocking_notifier_call_chain(&ec_dev->event_notifier, 0,

					     ec_dev);

}



static int cros_ec_lpc_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct acpi_device *adev;

	acpi_status status;

	struct cros_ec_device *ec_dev;

	u8 buf[2];

	int ret;
@@ -277,12 +288,33 @@ static int cros_ec_lpc_probe(struct platform_device *pdev) 
		return ret;

	}



	/*

	 * Connect a notify handler to process MKBP messages if we have a

	 * companion ACPI device.

	 */

	adev = ACPI_COMPANION(dev);

	if (adev) {

		status = acpi_install_notify_handler(adev->handle,

						     ACPI_ALL_NOTIFY,

						     cros_ec_lpc_acpi_notify,

						     ec_dev);

		if (ACPI_FAILURE(status))

			dev_warn(dev, "Failed to register notifier %08x\n",

				 status);

	}



	return 0;

}



static int cros_ec_lpc_remove(struct platform_device *pdev)

{

	struct cros_ec_device *ec_dev;

	struct acpi_device *adev;



	adev = ACPI_COMPANION(&pdev->dev);

	if (adev)

		acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,

					   cros_ec_lpc_acpi_notify);



	ec_dev = platform_get_drvdata(pdev);

	cros_ec_remove(ec_dev);