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,
134 	/*  printk("DoubleTalk PC - dtlk_read()\n"); */  in dtlk_read()
137 		return -EINVAL;  in dtlk_read()
144 				return -EFAULT;  in dtlk_read()
149 		if (file->f_flags & O_NONBLOCK)  in dtlk_read()
156 	return -EAGAIN;  in dtlk_read()
171 				return -EFAULT;  in dtlk_write()
182 		return -EINVAL;  in dtlk_write()
198 				/* the RDY bit goes zero 2-3 usec  in dtlk_write()
200 				   180-190 usec later.  Here, we wait  in dtlk_write()
214 		if (file->f_flags & O_NONBLOCK)  in dtlk_write()
219 		if (++retries > 10 * HZ) { /* wait no more than 10 sec  in dtlk_write()
220 					      from last write */  in dtlk_write()
221 			printk("dtlk: write timeout.  "  in dtlk_write()
225 			return -EBUSY;  in dtlk_write()
229 	return -EAGAIN;  in dtlk_write()
241 	   printk("<%ld>", jiffies-j);  in dtlk_poll()
254 	/* there are no exception conditions */  in dtlk_poll()
285 			return -EINVAL;  in dtlk_ioctl()
293 		return -EINVAL;  in dtlk_ioctl()
305 			return -EBUSY;  in dtlk_open()
309 		return -ENXIO;  in dtlk_open()
340 		printk(KERN_ERR "DoubleTalk PC - cannot register device\n");  in dtlk_init()
371 /* ------------------------------------------------------------------------ */
397 		return -EBUSY;  in dtlk_dev_probe()
401 		printk("DoubleTalk PC - Port %03x = %04x\n",  in dtlk_dev_probe()
414 			printk("DoubleTalk PC at %03x-%03x, "  in dtlk_dev_probe()
417 			       DTLK_IO_EXTENT - 1,  in dtlk_dev_probe()
418 			       sp->rom_version, sp->serial_number);  in dtlk_dev_probe()
497 	printk(KERN_INFO "DoubleTalk PC - not found\n");  in dtlk_dev_probe()
498 	return -ENODEV;  in dtlk_dev_probe()
504    printk(KERN_INFO"\nDoubleTalk PC - MINOR: %d, OPCODE: %d, ERROR: %d\n", 
510 /* interrogate the DoubleTalk PC and return its settings */
540 		if (i < sizeof(status.rom_version) - 1)  in dtlk_interrogate()
602 	/* no need to test -- this is only called when the port is readable */  in dtlk_read_lpc()
608 	/* acknowledging a read takes 3-4  in dtlk_read_lpc()
612 	while (inb_p(dtlk_port_lpc) != 0x7f && --retries > 0);  in dtlk_read_lpc()
620 /* write n bytes to tts port */
624 	/*  printk("dtlk_write_bytes(\"%-*s\", %d)\n", n, buf, n); */  in dtlk_write_bytes()
626 	while (n-- > 0)  in dtlk_write_bytes()
642 	if (ch != DTLK_CLEAR)	/* no flow control for CLEAR command */  in dtlk_write_tts()
650 	/* the RDY bit goes zero 2-3 usec after writing, and goes  in dtlk_write_tts()
651 	   1 again 180-190 usec later.  Here, we wait up to 10  in dtlk_write_tts()