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| author |   Gwendal Grignou <gwendal@chromium.org> | 2017-05-16 17:46:48 +0200 |
|---|---|---|
| committer |   Benson Leung <bleung@chromium.org> | 2017-06-23 16:12:17 -0700 |
| commit | a6df7798d03b29095723c5fe9174ee2b53135ed0 (patch) | |
| tree | aba0159fcfa4e2176df96ac7b0ae1f4fcb68365b /drivers/platform | |
| parent | platform/chrome: cros_ec_lpc: Add power management ops (diff) | |
| download | wireguard-linux-a6df7798d03b29095723c5fe9174ee2b53135ed0.tar.xz wireguard-linux-a6df7798d03b29095723c5fe9174ee2b53135ed0.zip | |
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>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_lpc.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c index 89afad7bb16e..eeb187e558ce 100644 --- a/drivers/platform/chrome/cros_ec_lpc.c +++ b/drivers/platform/chrome/cros_ec_lpc.c @@ -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); |