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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: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
This commit is contained in:
Gwendal Grignou 2017-05-16 17:46:48 +02:00 committed by Benson Leung
parent 450de8f43f
commit a6df7798d0
1 changed files with 32 additions and 0 deletions
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32
drivers/platform/chrome/cros_ec_lpc.c
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@ -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);