char: dtlk: remove driver for ISA speech synthesizer card

The dtlk driver supports the RC Systems DoubleTalk PC ISA speech
synthesizer card. It has severe coding style issues and has only
received tree-wide fixes and drive-by cleanups in the entire Git
history (since Linux 2.6.12-rc2). The same hardware is supported by
drivers/accessibility/speakup for screen reader use, but that
implementation does not share any code with this driver. Given all of
these factors, it is likely the driver is entirely unused. Remove it to
reduce future maintenance workload.

Note: The removed maintainer is already listed in CREDITS.
Signed-off-by: Ethan Nelson-Moore <enelsonmoore@gmail.com>
Link: https://patch.msgid.link/20260502043341.34324-1-enelsonmoore@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 86 deletions

diff --git a/include/linux/dtlk.h b/include/linux/dtlk.h
deleted file mode 100644
index 27b95e70bde3..000000000000
--- a/include/linux/dtlk.h
+++ /dev/null
@@ -1,86 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#define DTLK_MINOR	0
-#define DTLK_IO_EXTENT	0x02
-
-	/* ioctl's use magic number of 0xa3 */
-#define DTLK_INTERROGATE 0xa390	/* get settings from the DoubleTalk */
-#define DTLK_STATUS 0xa391	/* get status from the DoubleTalk */
-
-
-#define DTLK_CLEAR 0x18		/* stops speech */
-
-#define DTLK_MAX_RETRIES (loops_per_jiffy/(10000/HZ))
-
-	/* TTS Port Status Flags */
-#define TTS_READABLE     0x80	/* mask for bit which is nonzero if a
-				   byte can be read from the TTS port */
-#define TTS_SPEAKING     0x40	/* mask for SYNC bit, which is nonzero
-				   while DoubleTalk is producing
-				   output with TTS, PCM or CVSD
-				   synthesizers or tone generators
-				   (that is, all but LPC) */
-#define TTS_SPEAKING2    0x20	/* mask for SYNC2 bit,
-				   which falls to zero up to 0.4 sec
-				   before speech stops */
-#define TTS_WRITABLE     0x10	/* mask for RDY bit, which when set to
-             			   1, indicates the TTS port is ready
-             			   to accept a byte of data.  The RDY
-             			   bit goes zero 2-3 usec after
-             			   writing, and goes 1 again 180-190
-             			   usec later. */
-#define TTS_ALMOST_FULL  0x08	/* mask for AF bit: When set to 1,
-				   indicates that less than 300 free
-				   bytes are available in the TTS
-				   input buffer. AF is always 0 in the
-				   PCM, TGN and CVSD modes. */
-#define TTS_ALMOST_EMPTY 0x04	/* mask for AE bit: When set to 1,
-				   indicates that less than 300 bytes
-				   of data remain in DoubleTalk's
-				   input (TTS or PCM) buffer. AE is
-				   always 1 in the TGN and CVSD
-				   modes. */
-
-	/* LPC speak commands */
-#define LPC_5220_NORMAL 0x60	/* 5220 format decoding table, normal rate */
-#define LPC_5220_FAST 0x64	/* 5220 format decoding table, fast rate */
-#define LPC_D6_NORMAL 0x20	/* D6 format decoding table, normal rate */
-#define LPC_D6_FAST 0x24	/* D6 format decoding table, fast rate */
-
-	/* LPC Port Status Flags (valid only after one of the LPC
-           speak commands) */
-#define LPC_SPEAKING     0x80	/* mask for TS bit: When set to 1,
-				   indicates the LPC synthesizer is
-				   producing speech.*/
-#define LPC_BUFFER_LOW   0x40	/* mask for BL bit: When set to 1,
-				   indicates that the hardware LPC
-				   data buffer has less than 30 bytes
-				   remaining. (Total internal buffer
-				   size = 4096 bytes.) */
-#define LPC_BUFFER_EMPTY 0x20	/* mask for BE bit: When set to 1,
-				   indicates that the LPC data buffer
-				   ran out of data (error condition if
-				   TS is also 1).  */
-
-				/* data returned by Interrogate command */
-struct dtlk_settings
-{
-  unsigned short serial_number;	/* 0-7Fh:0-7Fh */
-  unsigned char rom_version[24]; /* null terminated string */
-  unsigned char mode;		/* 0=Character; 1=Phoneme; 2=Text */
-  unsigned char punc_level;	/* nB; 0-7 */
-  unsigned char formant_freq;	/* nF; 0-9 */
-  unsigned char pitch;		/* nP; 0-99 */
-  unsigned char speed;		/* nS; 0-9 */
-  unsigned char volume;		/* nV; 0-9 */
-  unsigned char tone;		/* nX; 0-2 */
-  unsigned char expression;	/* nE; 0-9 */
-  unsigned char ext_dict_loaded; /* 1=exception dictionary loaded */
-  unsigned char ext_dict_status; /* 1=exception dictionary enabled */
-  unsigned char free_ram;	/* # pages (truncated) remaining for
-                                   text buffer */
-  unsigned char articulation;	/* nA; 0-9 */
-  unsigned char reverb;		/* nR; 0-9 */
-  unsigned char eob;		/* 7Fh value indicating end of
-                                   parameter block */
-  unsigned char has_indexing;	/* nonzero if indexing is implemented */
-};