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.
15 /* This driver is for the DoubleTalk PC, a speech synthesizer
20    The DoubleTalk PC contains four voice synthesizers: text-to-speech
30    DoubleTalk PC implement index markers.  Both the TTS and LPC ports
33    The DoubleTalk PC generates no interrupts.
38    "write" sends bytes to the TTS port.  It is the responsibility of
40    This driver was written for use with the text-to-speech
57 #include <linux/errno.h>	/* for -EBUSY */
105 	.write		= dtlk_write,
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()
218 		if (++retries > 10 * HZ) { /* wait no more than 10 sec  in dtlk_write()
219 					      from last write */  in dtlk_write()
220 			printk("dtlk: write timeout.  "  in dtlk_write()
224 			return -EBUSY;  in dtlk_write()
228 	return -EAGAIN;  in dtlk_write()
240 	   printk("<%ld>", jiffies-j);  in dtlk_poll()
253 	/* there are no exception conditions */  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()
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", 
509 /* interrogate the DoubleTalk PC and return its settings */
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()
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()
619 /* write n bytes to tts port */
623 	/*  printk("dtlk_write_bytes(\"%-*s\", %d)\n", n, buf, n); */  in dtlk_write_bytes()
625 	while (n-- > 0)  in dtlk_write_bytes()
641 	if (ch != DTLK_CLEAR)	/* no flow control for CLEAR command */  in dtlk_write_tts()
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()
662 MODULE_DESCRIPTION("RC Systems DoubleTalk PC speech card driver");