lkml.org 
[lkml]   [2020]   [Jan]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v5 1/2] platform: chrome: Add cros-usbpd-notify driver
On Tue, Jan 14, 2020 at 9:07 AM Enric Balletbo i Serra
<enric.balletbo@collabora.com> wrote:
>
> Hi Prashant,
>
> On 14/1/20 4:10, Prashant Malani wrote:
> > From: Jon Flatley <jflat@chromium.org>
> > +};
> > +MODULE_DEVICE_TABLE(acpi, cros_usbpd_acpi_device_ids);
> Ops, there is a build error here, please make sure to build the driver before
> sending.
Hmm. That's odd, I did check using arm64 defconfig. My apologies.
Could you kindly share your build commands so that I can use this
going forward?
>
> s/cros_usbpd_acpi_device_ids/cros_usbpd_notify_acpi_device_ids/
>
> Apart from this I'm getting build errors with my defconfig which has CONFIG_ACPI
> and CONFIG_OF enabled.
>
> Another problem that I have with this driver is that actually there is no user
> for it. I'd really prefer have this included on a series that also introduces
> the user of this notifier. If you are only testing the ACPI case you can focus
> first on this use case and we add later the OF case (maybe is an easy way to
> proceed).
I'm testing with an arm64 device too locally. I will try to
incorporate the new change which updates cros_usbpd-charger to use the
notifier mechanism. I think we can try for the OF case simultaneously
(it is probably just the build errors I need to check for)

Thanks again!
>
> Thanks,
> Enric
>
> > +
> > +static struct acpi_driver cros_usbpd_notify_acpi_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_acpi_driver);
> > +
> > +#endif /* CONFIG_ACPI */
> > +
> > +#ifdef CONFIG_OF
> > +
> > +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_plat_driver = {
> > + .driver = {
> > + .name = DRV_NAME,
> > + },
> > + .probe = cros_usbpd_notify_probe_plat,
> > + .remove = cros_usbpd_notify_remove_plat,
> > +};
> > +module_platform_driver(cros_usbpd_notify_plat_driver);
> > +
> > +#endif /* CONFIG_OF */
> > +
> > +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..4f2791722b6d3
> > --- /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 2020 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 */
> >

\
 
 \ /
  Last update: 2020-01-14 20:24    [W:0.063 / U:6.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site