1 // SPDX-License-Identifier: GPL-2.0-only
2 /*                                              -*- linux-c -*-
3  * dtlk.c - DoubleTalk PC driver for Linux
8  * 2000-03-18 Jim Van Zandt: Fix polling.
20    The DoubleTalk PC contains four voice synthesizers: text-to-speech
21    (TTS), linear predictive coding (LPC), PCM/ADPCM, and CVSD.  It
22    also has a tone generator.  Output data for LPC are written to the
23    LPC port, and output data for the other modes are written to the
29    of the speech) are read from the LPC port.  Not all models of the
30    DoubleTalk PC implement index markers.  Both the TTS and LPC ports
33    The DoubleTalk PC generates no interrupts.
40    This driver was written for use with the text-to-speech
41    synthesizer.  If LPC output is needed some day, other minor device
44    "read" gets index markers from the LPC port.  If the device does
57 #include <linux/errno.h>	/* for -EBUSY */
133 	/*  printk("DoubleTalk PC - dtlk_read()\n"); */  in dtlk_read()
136 		return -EINVAL;  in dtlk_read()
143 				return -EFAULT;  in dtlk_read()
148 		if (file->f_flags & O_NONBLOCK)  in dtlk_read()
155 	return -EAGAIN;  in dtlk_read()
170 				return -EFAULT;  in dtlk_write()
181 		return -EINVAL;  in dtlk_write()
197 				/* the RDY bit goes zero 2-3 usec  in dtlk_write()
199 				   180-190 usec later.  Here, we wait  in dtlk_write()
213 		if (file->f_flags & O_NONBLOCK)  in dtlk_write()
224 			return -EBUSY;  in dtlk_write()
228 	return -EAGAIN;  in dtlk_write()
240 	   printk("<%ld>", jiffies-j);  in dtlk_poll()
255 	/* There won't be any interrupts, so we set a timer instead. */  in dtlk_poll()
284 			return -EINVAL;  in dtlk_ioctl()
292 		return -EINVAL;  in dtlk_ioctl()
304 			return -EBUSY;  in dtlk_open()
308 		return -ENXIO;  in dtlk_open()
339 		printk(KERN_ERR "DoubleTalk PC - cannot register device\n");  in dtlk_init()
370 /* ------------------------------------------------------------------------ */
396 		return -EBUSY;  in dtlk_dev_probe()
400 		printk("DoubleTalk PC - Port %03x = %04x\n",  in dtlk_dev_probe()
413 			printk("DoubleTalk PC at %03x-%03x, "  in dtlk_dev_probe()
416 			       DTLK_IO_EXTENT - 1,  in dtlk_dev_probe()
417 			       sp->rom_version, sp->serial_number);  in dtlk_dev_probe()
419                         /* put LPC port into known state, so  in dtlk_dev_probe()
435 /* This macro records ten samples read from the LPC port, for later display */  in dtlk_dev_probe()
496 	printk(KERN_INFO "DoubleTalk PC - not found\n");  in dtlk_dev_probe()
497 	return -ENODEV;  in dtlk_dev_probe()
503    printk(KERN_INFO"\nDoubleTalk PC - MINOR: %d, OPCODE: %d, ERROR: %d\n", 
539 		if (i < sizeof(status.rom_version) - 1)  in dtlk_interrogate()
601 	/* no need to test -- this is only called when the port is readable */  in dtlk_read_lpc()
603 	ch = inb_p(dtlk_port_lpc);	/* input from LPC port */  in dtlk_read_lpc()
607 	/* acknowledging a read takes 3-4  in dtlk_read_lpc()
611 	while (inb_p(dtlk_port_lpc) != 0x7f && --retries > 0);  in dtlk_read_lpc()
623 	/*  printk("dtlk_write_bytes(\"%-*s\", %d)\n", n, buf, n); */  in dtlk_write_bytes()
625 	while (n-- > 0)  in dtlk_write_bytes()
649 	/* the RDY bit goes zero 2-3 usec after writing, and goes  in dtlk_write_tts()
650 	   1 again 180-190 usec later.  Here, we wait up to 10  in dtlk_write_tts()