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Date: Mon, 6 May 2024 08:10:58 -0500
From: "Limonciello, Mario" <mario.limonciello@....com>
To: Thomas Weißschuh <linux@...ssschuh.net>,
Lee Jones <lee@...nel.org>, Benson Leung <bleung@...omium.org>,
Guenter Roeck <groeck@...omium.org>, Tzung-Bi Shih <tzungbi@...nel.org>
Cc: linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
"Dustin L. Howett" <dustin@...ett.net>, Sebastian Reichel <sre@...nel.org>,
linux-pm@...r.kernel.org
Subject: Re: [PATCH 1/2] platform/chrome: cros_ec_framework_laptop: introduce
driver
On 5/5/2024 3:56 PM, Thomas Weißschuh wrote:
> Framework Laptops are using embedded controller firmware based on the
> ChromeOS EC project.
> In addition to the standard upstream commands, some vendor-specific
> ones are implemented.
>
> Add a driver for those custom EC commands.
>
> At first, provide an empty driver that only takes care of scaffolding and
> device binding.
> Further patches will add functionality to the driver.
>
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> MAINTAINERS | 5 ++
> drivers/mfd/cros_ec_dev.c | 13 ++++++
> drivers/platform/chrome/Kconfig | 11 +++++
> drivers/platform/chrome/Makefile | 1 +
> drivers/platform/chrome/cros_ec_framework_laptop.c | 53 ++++++++++++++++++++++
> 5 files changed, 83 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c23fda1aa1f0..60699c289757 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4988,6 +4988,11 @@ S: Maintained
> F: Documentation/devicetree/bindings/sound/google,cros-ec-codec.yaml
> F: sound/soc/codecs/cros_ec_codec.*
>
> +CHROMEOS EC FRAMEWORK LAPTOP EXTENSIONS
> +M: Thomas Weißschuh <linux@...ssschuh.net>
> +S: Maintained
> +F: drivers/platform/chrome/cros_ec_framework_laptop.c
> +
> CHROMEOS EC SUBDRIVERS
> M: Benson Leung <bleung@...omium.org>
> R: Guenter Roeck <groeck@...omium.org>
> diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
> index a52d59cc2b1e..0a36e77e5039 100644
> --- a/drivers/mfd/cros_ec_dev.c
> +++ b/drivers/mfd/cros_ec_dev.c
> @@ -145,6 +145,10 @@ static const struct mfd_cell cros_ec_vbc_cells[] = {
> { .name = "cros-ec-vbc", }
> };
>
> +static const struct mfd_cell cros_ec_framework_cells[] = {
> + { .name = "cros-ec-framework", }
> +};
> +
> static void cros_ec_class_release(struct device *dev)
> {
> kfree(to_cros_ec_dev(dev));
> @@ -299,6 +303,15 @@ static int ec_device_probe(struct platform_device *pdev)
> retval);
> }
>
> + /* The EC on Framework laptops implements some nonstandard features */
I don't think there is a spec really for cros_ec is there? I think it
will depend upon what features you're talking about if this is the right
way to go.
The reason I say this is that maybe some of the same kinds of features
will make sense for chromebooks that use cros_ec in the future and thus
they should be "generic" cros_ec mfd cells to probe for in some way.
> + if (dmi_match(DMI_SYS_VENDOR, "Framework")) {
> + retval = mfd_add_hotplug_devices(ec->dev, cros_ec_framework_cells,
> + ARRAY_SIZE(cros_ec_framework_cells));
> + if (retval)
> + dev_warn(ec->dev, "failed to add framework laptop devices: %d\n",
> + retval);
> + }
> +
> return 0;
>
> failed:
> diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
> index 073616b5b5a0..ff69ee226606 100644
> --- a/drivers/platform/chrome/Kconfig
> +++ b/drivers/platform/chrome/Kconfig
> @@ -239,6 +239,17 @@ config CROS_EC_TYPEC
> To compile this driver as a module, choose M here: the module will be
> called cros-ec-typec.
>
> +config CROS_EC_FRAMEWORK_LAPTOP
> + tristate "ChromeOS EC Framework Laptop extensions"
> + depends on MFD_CROS_EC_DEV
> + default MFD_CROS_EC_DEV
> + help
> + If you say Y here, you get support for using Framework Laptop-specific extensions
> + of the Chrome OS EC.
> +
> + To compile this driver as a module, choose M here: the module will be
> + called cros_ec_framework_laptop.
> +
> config CROS_HPS_I2C
> tristate "ChromeOS HPS device"
> depends on HID && I2C && PM
> diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
> index 2dcc6ccc2302..ce6aac620086 100644
> --- a/drivers/platform/chrome/Makefile
> +++ b/drivers/platform/chrome/Makefile
> @@ -10,6 +10,7 @@ obj-$(CONFIG_CHROMEOS_PRIVACY_SCREEN) += chromeos_privacy_screen.o
> obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o
> obj-$(CONFIG_CHROMEOS_TBMC) += chromeos_tbmc.o
> obj-$(CONFIG_CROS_EC) += cros_ec.o
> +obj-$(CONFIG_CROS_EC_FRAMEWORK_LAPTOP) += cros_ec_framework_laptop.o
> obj-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o
> obj-$(CONFIG_CROS_EC_ISHTP) += cros_ec_ishtp.o
> obj-$(CONFIG_CROS_TYPEC_SWITCH) += cros_typec_switch.o
> diff --git a/drivers/platform/chrome/cros_ec_framework_laptop.c b/drivers/platform/chrome/cros_ec_framework_laptop.c
> new file mode 100644
> index 000000000000..8a8bf039fa9c
> --- /dev/null
> +++ b/drivers/platform/chrome/cros_ec_framework_laptop.c
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * ChromesOS EC driver for Framework laptop
> + *
> + * Copyright (C) 2024 Thomas Weißschuh <linux@...ssschuh.net>
> + */
> +#include <linux/kernel.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/platform_data/cros_ec_proto.h>
> +#include <linux/platform_device.h>
> +
> +#define DRV_NAME "cros-ec-framework"
> +
> +struct cros_fwk_priv {
> + struct cros_ec_device *cros_ec;
> +};
> +
> +static int cros_fwk_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> + struct cros_ec_device *cros_ec = ec_dev->ec_dev;
> + struct cros_fwk_priv *priv;
> +
> + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + priv->cros_ec = cros_ec;
> +
> + platform_set_drvdata(pdev, priv);
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id cros_fwk_id[] = {
> + { DRV_NAME, 0 },
> + { }
> +};
> +
> +static struct platform_driver cros_fwk_driver = {
> + .driver.name = DRV_NAME,
> + .probe = cros_fwk_probe,
> + .id_table = cros_fwk_id,
> +};
> +
> +module_platform_driver(cros_fwk_driver);
> +
> +MODULE_DEVICE_TABLE(platform, cros_fwk_id);
> +MODULE_DESCRIPTION("ChromeOS EC Framework Laptop extensions");
> +MODULE_AUTHOR("Thomas Weißschuh <linux@...ssschuh.net");
> +MODULE_LICENSE("GPL");
>
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