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 */
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()
225 			return -EBUSY;  in dtlk_write()
229 	return -EAGAIN;  in dtlk_write()
241 	   printk("<%ld>", jiffies-j);  in dtlk_poll()
256 	/* There won't be any interrupts, so we set a timer instead. */  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()
420                         /* put LPC port into known state, so  in dtlk_dev_probe()
436 /* This macro records ten samples read from the LPC port, for later display */  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", 
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()
604 	ch = inb_p(dtlk_port_lpc);	/* input from LPC port */  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()
624 	/*  printk("dtlk_write_bytes(\"%-*s\", %d)\n", n, buf, n); */  in dtlk_write_bytes()
626 	while (n-- > 0)  in dtlk_write_bytes()
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()