Messages in this thread | | | Subject | Re: [PATCH v4 1/2] platform: chrome: Add cros-usbpd-notify driver | From | Enric Balletbo i Serra <> | Date | Mon, 23 Dec 2019 08:18:00 +0100 |
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Hi Prashant,
On 20/12/19 20:38, Prashant Malani wrote: > From: Jon Flatley <jflat@chromium.org> > > ChromiumOS uses ACPI device with HID "GOOG0003" for power delivery > related events. The existing cros-usbpd-charger driver relies on these > events without ever actually receiving them on ACPI platforms. This is > because in the ChromeOS kernel trees, the GOOG0003 device is owned by an > ACPI driver that offers firmware updates to USB-C chargers. > > Introduce a new platform driver under cros-ec, the ChromeOS embedded > controller, that handles these PD events and dispatches them > appropriately over a notifier chain to all drivers that use them. > > On non-ACPI platforms, the driver gets instantiated for ECs which > support the EC_FEATURE_USB_PD feature bit, and on such platforms, the > notification events will get delivered using the MKBP event handling > mechanism. > > Co-Developed-by: Prashant Malani <pmalani@chromium.org> > Reviewed-by: Gwendal Grignou <gwendal@chromium.org> > Signed-off-by: Jon Flatley <jflat@chromium.org> > Signed-off-by: Prashant Malani <pmalani@chromium.org>
For my own reference:
Acked-for-chrome-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> --- > > Changes in v4(pmalani@chromium.org): > - No code changes, but added new version so that versioning is > consistent with the next patch in the series. > > Changes in v3 (pmalani@chromium.org): > - Renamed driver and files from "cros_ec_pd_notify" to > "cros_usbpd_notify" to be more consistent with other naming. > - Moved the change to include cros-usbpd-notify in the charger MFD into > a separate follow-on patch. > > Changes in v2 (pmalani@chromium.org): > - Removed dependency on DT entry; instead, we will instantiate the > driver on detecting EC_FEATURE_USB_PD for non-ACPI platforms. > - Modified the cros-ec-pd-notify device to be an mfd_cell under > usbpdcharger for non-ACPI platforms. Altered the platform_probe() call > to derive the cros EC structs appropriately. > - Replaced "usbpd_notify" with "pd_notify" in functions and structures. > - Addressed comments from upstream maintainer. > > drivers/platform/chrome/Kconfig | 9 ++ > drivers/platform/chrome/Makefile | 1 + > drivers/platform/chrome/cros_usbpd_notify.c | 151 ++++++++++++++++++ > .../linux/platform_data/cros_usbpd_notify.h | 17 ++ > 4 files changed, 178 insertions(+) > create mode 100644 drivers/platform/chrome/cros_usbpd_notify.c > create mode 100644 include/linux/platform_data/cros_usbpd_notify.h > > diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig > index 5f57282a28da0..3a8a98f2fb4d1 100644 > --- a/drivers/platform/chrome/Kconfig > +++ b/drivers/platform/chrome/Kconfig > @@ -226,6 +226,15 @@ config CROS_USBPD_LOGGER > To compile this driver as a module, choose M here: the > module will be called cros_usbpd_logger. > > +config CROS_USBPD_NOTIFY > + tristate "ChromeOS Type-C power delivery event notifier" > + depends on CROS_EC > + help > + If you say Y here, you get support for Type-C PD event notifications > + from the ChromeOS EC. On ACPI platorms this driver will bind to the > + GOOG0003 ACPI device, and on non-ACPI platforms this driver will get > + initialized on ECs which support the feature EC_FEATURE_USB_PD. > + > source "drivers/platform/chrome/wilco_ec/Kconfig" > > endif # CHROMEOS_PLATFORMS > diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile > index aacd5920d8a18..f6465f8ef0b5e 100644 > --- a/drivers/platform/chrome/Makefile > +++ b/drivers/platform/chrome/Makefile > @@ -22,5 +22,6 @@ obj-$(CONFIG_CROS_EC_DEBUGFS) += cros_ec_debugfs.o > obj-$(CONFIG_CROS_EC_SENSORHUB) += cros_ec_sensorhub.o > obj-$(CONFIG_CROS_EC_SYSFS) += cros_ec_sysfs.o > obj-$(CONFIG_CROS_USBPD_LOGGER) += cros_usbpd_logger.o > +obj-$(CONFIG_CROS_USBPD_NOTIFY) += cros_usbpd_notify.o > > obj-$(CONFIG_WILCO_EC) += wilco_ec/ > diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c > new file mode 100644 > index 0000000000000..05a7db834d2e0 > --- /dev/null > +++ b/drivers/platform/chrome/cros_usbpd_notify.c > @@ -0,0 +1,151 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright 2019 Google LLC > + * > + * This driver serves as the receiver of cros_ec PD host events. > + */ > + > +#include <linux/acpi.h> > +#include <linux/module.h> > +#include <linux/mfd/cros_ec.h> > +#include <linux/platform_data/cros_ec_commands.h> > +#include <linux/platform_data/cros_usbpd_notify.h> > +#include <linux/platform_data/cros_ec_proto.h> > +#include <linux/platform_device.h> > + > +#define DRV_NAME "cros-usbpd-notify" > +#define ACPI_DRV_NAME "GOOG0003" > + > +static BLOCKING_NOTIFIER_HEAD(cros_usbpd_notifier_list); > + > +/** > + * cros_usbpd_register_notify - Register a notifier callback for PD events. > + * @nb: Notifier block pointer to register > + * > + * On ACPI platforms this corresponds to host events on the ECPD > + * "GOOG0003" ACPI device. On non-ACPI platforms this will filter mkbp events > + * for USB PD events. > + * > + * Return: 0 on success or negative error code. > + */ > +int cros_usbpd_register_notify(struct notifier_block *nb) > +{ > + return blocking_notifier_chain_register( > + &cros_usbpd_notifier_list, nb); > +} > +EXPORT_SYMBOL_GPL(cros_usbpd_register_notify); > + > + > +/** > + * cros_usbpd_unregister_notify - Unregister notifier callback for PD events. > + * @nb: Notifier block pointer to unregister > + * > + * Unregister a notifier callback that was previously registered with > + * cros_usbpd_register_notify(). > + */ > +void cros_usbpd_unregister_notify(struct notifier_block *nb) > +{ > + blocking_notifier_chain_unregister(&cros_usbpd_notifier_list, nb); > +} > +EXPORT_SYMBOL_GPL(cros_usbpd_unregister_notify); > + > +#ifdef CONFIG_ACPI > + > +static int cros_usbpd_notify_add_acpi(struct acpi_device *adev) > +{ > + return 0; > +} > + > +static void cros_usbpd_notify_acpi(struct acpi_device *adev, u32 event) > +{ > + blocking_notifier_call_chain(&cros_usbpd_notifier_list, event, NULL); > +} > + > +static const struct acpi_device_id cros_usbpd_notify_acpi_device_ids[] = { > + { ACPI_DRV_NAME, 0 }, > + { } > +}; > +MODULE_DEVICE_TABLE(acpi, cros_usbpd_acpi_device_ids); > + > +static struct acpi_driver cros_usbpd_notify_driver = { > + .name = DRV_NAME, > + .class = DRV_NAME, > + .ids = cros_usbpd_notify_acpi_device_ids, > + .ops = { > + .add = cros_usbpd_notify_add_acpi, > + .notify = cros_usbpd_notify_acpi, > + }, > +}; > +module_acpi_driver(cros_usbpd_notify_driver); > + > +#else /* CONFIG_ACPI */ > + > +static int cros_usbpd_notify_plat(struct notifier_block *nb, > + unsigned long queued_during_suspend, void *data) > +{ > + struct cros_ec_device *ec_dev = (struct cros_ec_device *)data; > + u32 host_event = cros_ec_get_host_event(ec_dev); > + > + if (!host_event) > + return NOTIFY_BAD; > + > + if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) { > + blocking_notifier_call_chain(&cros_usbpd_notifier_list, > + host_event, NULL); > + return NOTIFY_OK; > + } > + return NOTIFY_DONE; > +} > + > +static int cros_usbpd_notify_probe_plat(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent); > + struct notifier_block *nb; > + int ret; > + > + nb = devm_kzalloc(dev, sizeof(*nb), GFP_KERNEL); > + if (!nb) > + return -ENOMEM; > + > + nb->notifier_call = cros_usbpd_notify_plat; > + dev_set_drvdata(dev, nb); > + > + ret = blocking_notifier_chain_register(&ecdev->ec_dev->event_notifier, > + nb); > + if (ret < 0) { > + dev_err(dev, "Failed to register notifier\n"); > + return ret; > + } > + > + return 0; > +} > + > +static int cros_usbpd_notify_remove_plat(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent); > + struct notifier_block *nb = > + (struct notifier_block *)dev_get_drvdata(dev); > + > + blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier, > + nb); > + > + return 0; > +} > + > +static struct platform_driver cros_usbpd_notify_driver = { > + .driver = { > + .name = DRV_NAME, > + }, > + .probe = cros_usbpd_notify_probe_plat, > + .remove = cros_usbpd_notify_remove_plat, > +}; > +module_platform_driver(cros_usbpd_notify_driver); > + > +#endif /* CONFIG_ACPI */ > + > +MODULE_LICENSE("GPL"); > +MODULE_DESCRIPTION("ChromeOS power delivery notifier device"); > +MODULE_AUTHOR("Jon Flatley <jflat@chromium.org>"); > +MODULE_ALIAS("platform:" DRV_NAME); > diff --git a/include/linux/platform_data/cros_usbpd_notify.h b/include/linux/platform_data/cros_usbpd_notify.h > new file mode 100644 > index 0000000000000..cd7c7bebf18da > --- /dev/null > +++ b/include/linux/platform_data/cros_usbpd_notify.h > @@ -0,0 +1,17 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * ChromeOS EC Power Delivery Notifier Driver > + * > + * Copyright 2019 Google LLC > + */ > + > +#ifndef __LINUX_PLATFORM_DATA_CROS_USBPD_NOTIFY_H > +#define __LINUX_PLATFORM_DATA_CROS_USBPD_NOTIFY_H > + > +#include <linux/notifier.h> > + > +int cros_usbpd_register_notify(struct notifier_block *nb); > + > +void cros_usbpd_unregister_notify(struct notifier_block *nb); > + > +#endif /* __LINUX_PLATFORM_DATA_CROS_USBPD_NOTIFY_H */ >
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