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kernel/include/drm/bridge/mhl.h
Gustavo A. R. Silva 78a7b61aef drm/bridge/mhl.h: Replace zero-length array with flexible-array member 
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200305110011.GA21056@embeddedor
2020-03-06 11:52:01 +01:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Defines for Mobile High-Definition Link (MHL) interface
*
* Copyright (C) 2015, Samsung Electronics, Co., Ltd.
* Andrzej Hajda <a.hajda@samsung.com>
*
* Based on MHL driver for Android devices.
* Copyright (C) 2013-2014 Silicon Image, Inc.
*/
#ifndef __MHL_H__
#define __MHL_H__
#include <linux/types.h>
/* Device Capabilities Registers */
enum {
MHL_DCAP_DEV_STATE,
MHL_DCAP_MHL_VERSION,
MHL_DCAP_CAT,
MHL_DCAP_ADOPTER_ID_H,
MHL_DCAP_ADOPTER_ID_L,
MHL_DCAP_VID_LINK_MODE,
MHL_DCAP_AUD_LINK_MODE,
MHL_DCAP_VIDEO_TYPE,
MHL_DCAP_LOG_DEV_MAP,
MHL_DCAP_BANDWIDTH,
MHL_DCAP_FEATURE_FLAG,
MHL_DCAP_DEVICE_ID_H,
MHL_DCAP_DEVICE_ID_L,
MHL_DCAP_SCRATCHPAD_SIZE,
MHL_DCAP_INT_STAT_SIZE,
MHL_DCAP_RESERVED,
MHL_DCAP_SIZE
};
#define MHL_DCAP_CAT_SINK 0x01
#define MHL_DCAP_CAT_SOURCE 0x02
#define MHL_DCAP_CAT_POWER 0x10
#define MHL_DCAP_CAT_PLIM(x) ((x) << 5)
#define MHL_DCAP_VID_LINK_RGB444 0x01
#define MHL_DCAP_VID_LINK_YCBCR444 0x02
#define MHL_DCAP_VID_LINK_YCBCR422 0x04
#define MHL_DCAP_VID_LINK_PPIXEL 0x08
#define MHL_DCAP_VID_LINK_ISLANDS 0x10
#define MHL_DCAP_VID_LINK_VGA 0x20
#define MHL_DCAP_VID_LINK_16BPP 0x40
#define MHL_DCAP_AUD_LINK_2CH 0x01
#define MHL_DCAP_AUD_LINK_8CH 0x02
#define MHL_DCAP_VT_GRAPHICS 0x00
#define MHL_DCAP_VT_PHOTO 0x02
#define MHL_DCAP_VT_CINEMA 0x04
#define MHL_DCAP_VT_GAMES 0x08
#define MHL_DCAP_SUPP_VT 0x80
#define MHL_DCAP_LD_DISPLAY 0x01
#define MHL_DCAP_LD_VIDEO 0x02
#define MHL_DCAP_LD_AUDIO 0x04
#define MHL_DCAP_LD_MEDIA 0x08
#define MHL_DCAP_LD_TUNER 0x10
#define MHL_DCAP_LD_RECORD 0x20
#define MHL_DCAP_LD_SPEAKER 0x40
#define MHL_DCAP_LD_GUI 0x80
#define MHL_DCAP_LD_ALL 0xFF
#define MHL_DCAP_FEATURE_RCP_SUPPORT 0x01
#define MHL_DCAP_FEATURE_RAP_SUPPORT 0x02
#define MHL_DCAP_FEATURE_SP_SUPPORT 0x04
#define MHL_DCAP_FEATURE_UCP_SEND_SUPPOR 0x08
#define MHL_DCAP_FEATURE_UCP_RECV_SUPPORT 0x10
#define MHL_DCAP_FEATURE_RBP_SUPPORT 0x40
/* Extended Device Capabilities Registers */
enum {
MHL_XDC_ECBUS_SPEEDS,
MHL_XDC_TMDS_SPEEDS,
MHL_XDC_ECBUS_ROLES,
MHL_XDC_LOG_DEV_MAPX,
MHL_XDC_SIZE
};
#define MHL_XDC_ECBUS_S_075 0x01
#define MHL_XDC_ECBUS_S_8BIT 0x02
#define MHL_XDC_ECBUS_S_12BIT 0x04
#define MHL_XDC_ECBUS_D_150 0x10
#define MHL_XDC_ECBUS_D_8BIT 0x20
#define MHL_XDC_TMDS_000 0x00
#define MHL_XDC_TMDS_150 0x01
#define MHL_XDC_TMDS_300 0x02
#define MHL_XDC_TMDS_600 0x04
/* MHL_XDC_ECBUS_ROLES flags */
#define MHL_XDC_DEV_HOST 0x01
#define MHL_XDC_DEV_DEVICE 0x02
#define MHL_XDC_DEV_CHARGER 0x04
#define MHL_XDC_HID_HOST 0x08
#define MHL_XDC_HID_DEVICE 0x10
/* MHL_XDC_LOG_DEV_MAPX flags */
#define MHL_XDC_LD_PHONE 0x01
/* Device Status Registers */
enum {
MHL_DST_CONNECTED_RDY,
MHL_DST_LINK_MODE,
MHL_DST_VERSION,
MHL_DST_SIZE
};
/* Offset of DEVSTAT registers */
#define MHL_DST_OFFSET 0x30
#define MHL_DST_REG(name) (MHL_DST_OFFSET + MHL_DST_##name)
#define MHL_DST_CONN_DCAP_RDY 0x01
#define MHL_DST_CONN_XDEVCAPP_SUPP 0x02
#define MHL_DST_CONN_POW_STAT 0x04
#define MHL_DST_CONN_PLIM_STAT_MASK 0x38
#define MHL_DST_LM_CLK_MODE_MASK 0x07
#define MHL_DST_LM_CLK_MODE_PACKED_PIXEL 0x02
#define MHL_DST_LM_CLK_MODE_NORMAL 0x03
#define MHL_DST_LM_PATH_EN_MASK 0x08
#define MHL_DST_LM_PATH_ENABLED 0x08
#define MHL_DST_LM_PATH_DISABLED 0x00
#define MHL_DST_LM_MUTED_MASK 0x10
/* Extended Device Status Registers */
enum {
MHL_XDS_CURR_ECBUS_MODE,
MHL_XDS_AVLINK_MODE_STATUS,
MHL_XDS_AVLINK_MODE_CONTROL,
MHL_XDS_MULTI_SINK_STATUS,
MHL_XDS_SIZE
};
/* Offset of XDEVSTAT registers */
#define MHL_XDS_OFFSET 0x90
#define MHL_XDS_REG(name) (MHL_XDS_OFFSET + MHL_XDS_##name)
/* MHL_XDS_REG_CURR_ECBUS_MODE flags */
#define MHL_XDS_SLOT_MODE_8BIT 0x00
#define MHL_XDS_SLOT_MODE_6BIT 0x01
#define MHL_XDS_ECBUS_S 0x04
#define MHL_XDS_ECBUS_D 0x08
#define MHL_XDS_LINK_CLOCK_75MHZ 0x00
#define MHL_XDS_LINK_CLOCK_150MHZ 0x10
#define MHL_XDS_LINK_CLOCK_300MHZ 0x20
#define MHL_XDS_LINK_CLOCK_600MHZ 0x30
#define MHL_XDS_LINK_STATUS_NO_SIGNAL 0x00
#define MHL_XDS_LINK_STATUS_CRU_LOCKED 0x01
#define MHL_XDS_LINK_STATUS_TMDS_NORMAL 0x02
#define MHL_XDS_LINK_STATUS_TMDS_RESERVED 0x03
#define MHL_XDS_LINK_RATE_1_5_GBPS 0x00
#define MHL_XDS_LINK_RATE_3_0_GBPS 0x01
#define MHL_XDS_LINK_RATE_6_0_GBPS 0x02
#define MHL_XDS_ATT_CAPABLE 0x08
#define MHL_XDS_SINK_STATUS_1_HPD_LOW 0x00
#define MHL_XDS_SINK_STATUS_1_HPD_HIGH 0x01
#define MHL_XDS_SINK_STATUS_2_HPD_LOW 0x00
#define MHL_XDS_SINK_STATUS_2_HPD_HIGH 0x04
#define MHL_XDS_SINK_STATUS_3_HPD_LOW 0x00
#define MHL_XDS_SINK_STATUS_3_HPD_HIGH 0x10
#define MHL_XDS_SINK_STATUS_4_HPD_LOW 0x00
#define MHL_XDS_SINK_STATUS_4_HPD_HIGH 0x40
/* Interrupt Registers */
enum {
MHL_INT_RCHANGE,
MHL_INT_DCHANGE,
MHL_INT_SIZE
};
/* Offset of DEVSTAT registers */
#define MHL_INT_OFFSET 0x20
#define MHL_INT_REG(name) (MHL_INT_OFFSET + MHL_INT_##name)
#define MHL_INT_RC_DCAP_CHG 0x01
#define MHL_INT_RC_DSCR_CHG 0x02
#define MHL_INT_RC_REQ_WRT 0x04
#define MHL_INT_RC_GRT_WRT 0x08
#define MHL_INT_RC_3D_REQ 0x10
#define MHL_INT_RC_FEAT_REQ 0x20
#define MHL_INT_RC_FEAT_COMPLETE 0x40
#define MHL_INT_DC_EDID_CHG 0x02
enum {
MHL_ACK = 0x33, /* Command or Data byte acknowledge */
MHL_NACK = 0x34, /* Command or Data byte not acknowledge */
MHL_ABORT = 0x35, /* Transaction abort */
MHL_WRITE_STAT = 0xe0, /* Write one status register */
MHL_SET_INT = 0x60, /* Write one interrupt register */
MHL_READ_DEVCAP_REG = 0x61, /* Read one register */
MHL_GET_STATE = 0x62, /* Read CBUS revision level from follower */
MHL_GET_VENDOR_ID = 0x63, /* Read vendor ID value from follower */
MHL_SET_HPD = 0x64, /* Set Hot Plug Detect in follower */
MHL_CLR_HPD = 0x65, /* Clear Hot Plug Detect in follower */
MHL_SET_CAP_ID = 0x66, /* Set Capture ID for downstream device */
MHL_GET_CAP_ID = 0x67, /* Get Capture ID from downstream device */
MHL_MSC_MSG = 0x68, /* VS command to send RCP sub-commands */
MHL_GET_SC1_ERRORCODE = 0x69, /* Get Vendor-Specific error code */
MHL_GET_DDC_ERRORCODE = 0x6A, /* Get DDC channel command error code */
MHL_GET_MSC_ERRORCODE = 0x6B, /* Get MSC command error code */
MHL_WRITE_BURST = 0x6C, /* Write 1-16 bytes to responder's scratchpad */
MHL_GET_SC3_ERRORCODE = 0x6D, /* Get channel 3 command error code */
MHL_WRITE_XSTAT = 0x70, /* Write one extended status register */
MHL_READ_XDEVCAP_REG = 0x71, /* Read one extended devcap register */
/* let the rest of these float, they are software specific */
MHL_READ_EDID_BLOCK,
MHL_SEND_3D_REQ_OR_FEAT_REQ,
MHL_READ_DEVCAP,
MHL_READ_XDEVCAP
};
/* MSC message types */
enum {
MHL_MSC_MSG_RCP = 0x10, /* RCP sub-command */
MHL_MSC_MSG_RCPK = 0x11, /* RCP Acknowledge sub-command */
MHL_MSC_MSG_RCPE = 0x12, /* RCP Error sub-command */
MHL_MSC_MSG_RAP = 0x20, /* Mode Change Warning sub-command */
MHL_MSC_MSG_RAPK = 0x21, /* MCW Acknowledge sub-command */
MHL_MSC_MSG_RBP = 0x22, /* Remote Button Protocol sub-command */
MHL_MSC_MSG_RBPK = 0x23, /* RBP Acknowledge sub-command */
MHL_MSC_MSG_RBPE = 0x24, /* RBP Error sub-command */
MHL_MSC_MSG_UCP = 0x30, /* UCP sub-command */
MHL_MSC_MSG_UCPK = 0x31, /* UCP Acknowledge sub-command */
MHL_MSC_MSG_UCPE = 0x32, /* UCP Error sub-command */
MHL_MSC_MSG_RUSB = 0x40, /* Request USB host role */
MHL_MSC_MSG_RUSBK = 0x41, /* Acknowledge request for USB host role */
MHL_MSC_MSG_RHID = 0x42, /* Request HID host role */
MHL_MSC_MSG_RHIDK = 0x43, /* Acknowledge request for HID host role */
MHL_MSC_MSG_ATT = 0x50, /* Request attention sub-command */
MHL_MSC_MSG_ATTK = 0x51, /* ATT Acknowledge sub-command */
MHL_MSC_MSG_BIST_TRIGGER = 0x60,
MHL_MSC_MSG_BIST_REQUEST_STAT = 0x61,
MHL_MSC_MSG_BIST_READY = 0x62,
MHL_MSC_MSG_BIST_STOP = 0x63,
};
/* RAP action codes */
#define MHL_RAP_POLL 0x00 /* Just do an ack */
#define MHL_RAP_CONTENT_ON 0x10 /* Turn content stream ON */
#define MHL_RAP_CONTENT_OFF 0x11 /* Turn content stream OFF */
#define MHL_RAP_CBUS_MODE_DOWN 0x20
#define MHL_RAP_CBUS_MODE_UP 0x21
/* RAPK status codes */
#define MHL_RAPK_NO_ERR 0x00 /* RAP action recognized & supported */
#define MHL_RAPK_UNRECOGNIZED 0x01 /* Unknown RAP action code received */
#define MHL_RAPK_UNSUPPORTED 0x02 /* Rcvd RAP action code not supported */
#define MHL_RAPK_BUSY 0x03 /* Responder too busy to respond */
/* Bit masks for RCP messages */
#define MHL_RCP_KEY_RELEASED_MASK 0x80
#define MHL_RCP_KEY_ID_MASK 0x7F
/*
* Error status codes for RCPE messages
*/
/* No error. (Not allowed in RCPE messages) */
#define MHL_RCPE_STATUS_NO_ERROR 0x00
/* Unsupported/unrecognized key code */
#define MHL_RCPE_STATUS_INEFFECTIVE_KEY_CODE 0x01
/* Responder busy. Initiator may retry message */
#define MHL_RCPE_STATUS_BUSY 0x02
/*
* Error status codes for RBPE messages
*/
/* No error. (Not allowed in RBPE messages) */
#define MHL_RBPE_STATUS_NO_ERROR 0x00
/* Unsupported/unrecognized button code */
#define MHL_RBPE_STATUS_INEFFECTIVE_BUTTON_CODE 0x01
/* Responder busy. Initiator may retry message */
#define MHL_RBPE_STATUS_BUSY 0x02
/*
* Error status codes for UCPE messages
*/
/* No error. (Not allowed in UCPE messages) */
#define MHL_UCPE_STATUS_NO_ERROR 0x00
/* Unsupported/unrecognized key code */
#define MHL_UCPE_STATUS_INEFFECTIVE_KEY_CODE 0x01
enum mhl_burst_id {
MHL_BURST_ID_3D_VIC = 0x10,
MHL_BURST_ID_3D_DTD = 0x11,
MHL_BURST_ID_HEV_VIC = 0x20,
MHL_BURST_ID_HEV_DTDA = 0x21,
MHL_BURST_ID_HEV_DTDB = 0x22,
MHL_BURST_ID_VC_ASSIGN = 0x38,
MHL_BURST_ID_VC_CONFIRM = 0x39,
MHL_BURST_ID_AUD_DELAY = 0x40,
MHL_BURST_ID_ADT_BURSTID = 0x41,
MHL_BURST_ID_BIST_SETUP = 0x51,
MHL_BURST_ID_BIST_RETURN_STAT = 0x52,
MHL_BURST_ID_EMSC_SUPPORT = 0x61,
MHL_BURST_ID_HID_PAYLOAD = 0x62,
MHL_BURST_ID_BLK_RCV_BUFFER_INFO = 0x63,
MHL_BURST_ID_BITS_PER_PIXEL_FMT = 0x64,
};
struct mhl_burst_blk_rcv_buffer_info {
__be16 id;
__le16 size;
} __packed;
struct mhl3_burst_header {
__be16 id;
u8 checksum;
u8 total_entries;
u8 sequence_index;
} __packed;
struct mhl_burst_bits_per_pixel_fmt {
struct mhl3_burst_header hdr;
u8 num_entries;
struct {
u8 stream_id;
u8 pixel_format;
} __packed desc[];
} __packed;
struct mhl_burst_emsc_support {
struct mhl3_burst_header hdr;
u8 num_entries;
__be16 burst_id[];
} __packed;
struct mhl_burst_audio_descr {
struct mhl3_burst_header hdr;
u8 flags;
u8 short_desc[9];
} __packed;
/*
* MHL3 infoframe related definitions
*/
#define MHL3_IEEE_OUI 0x7ca61d
#define MHL3_INFOFRAME_SIZE 15
enum mhl3_video_format {
MHL3_VIDEO_FORMAT_NONE,
MHL3_VIDEO_FORMAT_3D,
MHL3_VIDEO_FORMAT_MULTI_VIEW,
MHL3_VIDEO_FORMAT_DUAL_3D
};
enum mhl3_3d_format_type {
MHL3_3D_FORMAT_TYPE_FS, /* frame sequential */
MHL3_3D_FORMAT_TYPE_TB, /* top-bottom */
MHL3_3D_FORMAT_TYPE_LR, /* left-right */
MHL3_3D_FORMAT_TYPE_FS_TB, /* frame sequential, top-bottom */
MHL3_3D_FORMAT_TYPE_FS_LR, /* frame sequential, left-right */
MHL3_3D_FORMAT_TYPE_TB_LR /* top-bottom, left-right */
};
struct mhl3_infoframe {
unsigned char version;
enum mhl3_video_format video_format;
enum mhl3_3d_format_type format_type;
bool sep_audio;
int hev_format;
int av_delay;
};
#endif /* __MHL_H__ */
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