linux-kernel - Re: [PATCH v1 2/9] misc: Support Asus Transformer's EC access device

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Message-ID: <2026020350-unrevised-humming-7a42@gregkh>
Date: Tue, 3 Feb 2026 12:41:44 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Svyatoslav Ryhel <clamor95@...il.com>
Cc: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Pavel Machek <pavel@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Sebastian Reichel <sre@...nel.org>,
	Michał Mirosław <mirq-linux@...e.qmqm.pl>,
	Ion Agorria <ion@...rria.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	linux-leds@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v1 2/9] misc: Support Asus Transformer's EC access device

On Sun, Feb 01, 2026 at 12:43:36PM +0200, Svyatoslav Ryhel wrote:
> --- /dev/null
> +++ b/drivers/misc/asus-dockram.c
> @@ -0,0 +1,327 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * ASUS EC: DockRAM
> + */
> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/mfd/asus-ec.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/slab.h>
> +#include <linux/string.h>
> +#include <linux/sysfs.h>
> +#include <linux/types.h>
> +#include <linux/unaligned.h>
> +
> +struct dockram_ec_data {
> +	struct mutex ctl_lock; /* prevent simultaneous access */
> +	char ctl_data[DOCKRAM_ENTRY_BUFSIZE];
> +};
> +
> +int asus_dockram_read(struct i2c_client *client, int reg, char *buf)
> +{
> +	int rc;
> +
> +	memset(buf, 0, DOCKRAM_ENTRY_BUFSIZE);
> +	rc = i2c_smbus_read_i2c_block_data(client, reg, DOCKRAM_ENTRY_BUFSIZE, buf);
> +	if (rc < 0)
> +		return rc;
> +
> +	if (buf[0] > DOCKRAM_ENTRY_SIZE) {
> +		dev_err(&client->dev, "bad data len; buffer: %*ph; rc: %d\n",
> +			DOCKRAM_ENTRY_BUFSIZE, buf, rc);
> +		return -EPROTO;
> +	}
> +
> +	dev_dbg(&client->dev, "got data; buffer: %*ph; rc: %d\n",
> +		DOCKRAM_ENTRY_BUFSIZE, buf, rc);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(asus_dockram_read);

No documentation for these new public symbols?


> +static BIN_ATTR_RW(dockram, DOCKRAM_ENTRIES * DOCKRAM_ENTRY_SIZE);
> +static DEVICE_ATTR_RW(control_reg);

You did not document your new sysfs files in Documentation/ABI/ which is
required.

Also, why do you need a brand new user/kernel api at all?  Who is going
to use this and for what?

thanks,

greg k-h