linux-kernel - Re: [RFC 3/5] i3c: device: expose transfer strutures to uapi

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Date:   Thu, 12 Dec 2019 15:42:33 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     linux-kernel@...r.kernel.org, linux-i3c@...ts.infradead.org,
        Joao.Pinto@...opsys.com, bbrezillon@...nel.org, wsa@...-dreams.de,
        arnd@...db.de, broonie@...nel.org
Subject: Re: [RFC 3/5] i3c: device: expose transfer strutures to uapi

On Tue, Dec 10, 2019 at 04:37:31PM +0100, Vitor Soares wrote:
> --- /dev/null
> +++ b/include/uapi/linux/i3c/device.h
> @@ -0,0 +1,66 @@
> +/* SPDX-License-Identifier: GPL-2.0 */

Not a valid uapi SPDX license :(


> +/*
> + * Copyright (c) 2019 Synopsys, Inc. and/or its affiliates.
> + *
> + * Author: Vitor Soares <vitor.soares@...opsys.com>
> + */
> +
> +#ifndef _UAPI_LINUX_I3C_DEVICE_H
> +#define _UAPI_LINUX_I3C_DEVICE_H
> +
> +#include <linux/types.h>
> +
> +/**
> + * enum i3c_error_code - I3C error codes
> + *
> + * These are the standard error codes as defined by the I3C specification.
> + * When -EIO is returned by the i3c_device_do_priv_xfers() or
> + * i3c_device_send_hdr_cmds() one can check the error code in
> + * &struct_i3c_priv_xfer.err or &struct i3c_hdr_cmd.err to get a better idea of
> + * what went wrong.
> + *
> + * @I3C_ERROR_UNKNOWN: unknown error, usually means the error is not I3C
> + *		       related
> + * @I3C_ERROR_M0: M0 error
> + * @I3C_ERROR_M1: M1 error
> + * @I3C_ERROR_M2: M2 error
> + */
> +enum i3c_error_code {
> +	I3C_ERROR_UNKNOWN = 0,
> +	I3C_ERROR_M0 = 1,
> +	I3C_ERROR_M1,
> +	I3C_ERROR_M2,

You have to specify all of these.

> +};
> +
> +/**
> + * enum i3c_hdr_mode - HDR mode ids
> + * @I3C_HDR_DDR: DDR mode
> + * @I3C_HDR_TSP: TSP mode
> + * @I3C_HDR_TSL: TSL mode
> + */
> +enum i3c_hdr_mode {
> +	I3C_HDR_DDR,
> +	I3C_HDR_TSP,
> +	I3C_HDR_TSL,

same here.


> +};
> +
> +/**
> + * struct i3c_priv_xfer - I3C SDR private transfer
> + * @rnw: encodes the transfer direction. true for a read, false for a write
> + * @len: transfer length in bytes of the transfer
> + * @data: input/output buffer
> + * @data.in: input buffer. Must point to a DMA-able buffer
> + * @data.out: output buffer. Must point to a DMA-able buffer
> + * @err: I3C error code
> + */
> +struct i3c_priv_xfer {
> +	u8 rnw;
> +	u16 len;
> +	union {
> +		void *in;
> +		const void *out;
> +	} data;
> +	enum i3c_error_code err;

Ick, that's a horrid user/kernel api structure that will not work at
all.

Please fix.

thanks,

greg k-h