1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * originally written by: Kirk Reiser <kirk@braille.uwo.ca>
4  * this version considerably modified by David Borowski, david575@rogers.com
5  *
6  * Copyright (C) 1998-99  Kirk Reiser.
7  * Copyright (C) 2003 David Borowski.
8  *
9  * specificly written as a driver for the speakup screenreview
10  * package it's not a general device driver.
11  * This driver is for the RC Systems DoubleTalk PC internal synthesizer.
12  */
13 #include <linux/jiffies.h>
14 #include <linux/sched.h>
15 #include <linux/timer.h>
16 #include <linux/kthread.h>
17 
18 #include "spk_priv.h"
19 #include "serialio.h"
20 #include "speakup_dtlk.h" /* local header file for DoubleTalk values */
21 #include "speakup.h"
22 
23 #define DRV_VERSION "2.10"
24 #define PROCSPEECH 0x00
25 
26 static int synth_probe(struct spk_synth *synth);
27 static void dtlk_release(struct spk_synth *synth);
28 static const char *synth_immediate(struct spk_synth *synth, const char *buf);
29 static void do_catch_up(struct spk_synth *synth);
30 static void synth_flush(struct spk_synth *synth);
31 
32 static int synth_lpc;
33 static int port_forced;
34 static unsigned int synth_portlist[] = {
35 		 0x25e, 0x29e, 0x2de, 0x31e, 0x35e, 0x39e, 0
36 };
37 
38 static u_char synth_status;
39 
40 static struct var_t vars[] = {
41 	{ CAPS_START, .u.s = {"\x01+35p" } },
42 	{ CAPS_STOP, .u.s = {"\x01-35p" } },
43 	{ RATE, .u.n = {"\x01%ds", 8, 0, 9, 0, 0, NULL } },
44 	{ PITCH, .u.n = {"\x01%dp", 50, 0, 99, 0, 0, NULL } },
45 	{ VOL, .u.n = {"\x01%dv", 5, 0, 9, 0, 0, NULL } },
46 	{ TONE, .u.n = {"\x01%dx", 1, 0, 2, 0, 0, NULL } },
47 	{ PUNCT, .u.n = {"\x01%db", 7, 0, 15, 0, 0, NULL } },
48 	{ VOICE, .u.n = {"\x01%do", 0, 0, 7, 0, 0, NULL } },
49 	{ FREQUENCY, .u.n = {"\x01%df", 5, 0, 9, 0, 0, NULL } },
50 	{ DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
51 	V_LAST_VAR
52 };
53 
54 /*
55  * These attributes will appear in /sys/accessibility/speakup/dtlk.
56  */
57 static struct kobj_attribute caps_start_attribute =
58 	__ATTR(caps_start, 0644, spk_var_show, spk_var_store);
59 static struct kobj_attribute caps_stop_attribute =
60 	__ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
61 static struct kobj_attribute freq_attribute =
62 	__ATTR(freq, 0644, spk_var_show, spk_var_store);
63 static struct kobj_attribute pitch_attribute =
64 	__ATTR(pitch, 0644, spk_var_show, spk_var_store);
65 static struct kobj_attribute punct_attribute =
66 	__ATTR(punct, 0644, spk_var_show, spk_var_store);
67 static struct kobj_attribute rate_attribute =
68 	__ATTR(rate, 0644, spk_var_show, spk_var_store);
69 static struct kobj_attribute tone_attribute =
70 	__ATTR(tone, 0644, spk_var_show, spk_var_store);
71 static struct kobj_attribute voice_attribute =
72 	__ATTR(voice, 0644, spk_var_show, spk_var_store);
73 static struct kobj_attribute vol_attribute =
74 	__ATTR(vol, 0644, spk_var_show, spk_var_store);
75 
76 static struct kobj_attribute delay_time_attribute =
77 	__ATTR(delay_time, 0644, spk_var_show, spk_var_store);
78 static struct kobj_attribute direct_attribute =
79 	__ATTR(direct, 0644, spk_var_show, spk_var_store);
80 static struct kobj_attribute full_time_attribute =
81 	__ATTR(full_time, 0644, spk_var_show, spk_var_store);
82 static struct kobj_attribute jiffy_delta_attribute =
83 	__ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
84 static struct kobj_attribute trigger_time_attribute =
85 	__ATTR(trigger_time, 0644, spk_var_show, spk_var_store);
86 
87 /*
88  * Create a group of attributes so that we can create and destroy them all
89  * at once.
90  */
91 static struct attribute *synth_attrs[] = {
92 	&caps_start_attribute.attr,
93 	&caps_stop_attribute.attr,
94 	&freq_attribute.attr,
95 	&pitch_attribute.attr,
96 	&punct_attribute.attr,
97 	&rate_attribute.attr,
98 	&tone_attribute.attr,
99 	&voice_attribute.attr,
100 	&vol_attribute.attr,
101 	&delay_time_attribute.attr,
102 	&direct_attribute.attr,
103 	&full_time_attribute.attr,
104 	&jiffy_delta_attribute.attr,
105 	&trigger_time_attribute.attr,
106 	NULL,	/* need to NULL terminate the list of attributes */
107 };
108 
109 static struct spk_synth synth_dtlk = {
110 	.name = "dtlk",
111 	.version = DRV_VERSION,
112 	.long_name = "DoubleTalk PC",
113 	.init = "\x01@\x01\x31y",
114 	.procspeech = PROCSPEECH,
115 	.clear = SYNTH_CLEAR,
116 	.delay = 500,
117 	.trigger = 30,
118 	.jiffies = 50,
119 	.full = 1000,
120 	.startup = SYNTH_START,
121 	.checkval = SYNTH_CHECK,
122 	.vars = vars,
123 	.io_ops = &spk_serial_io_ops,
124 	.probe = synth_probe,
125 	.release = dtlk_release,
126 	.synth_immediate = synth_immediate,
127 	.catch_up = do_catch_up,
128 	.flush = synth_flush,
129 	.is_alive = spk_synth_is_alive_nop,
130 	.synth_adjust = NULL,
131 	.read_buff_add = NULL,
132 	.get_index = spk_synth_get_index,
133 	.indexing = {
134 		.command = "\x01%di",
135 		.lowindex = 1,
136 		.highindex = 5,
137 		.currindex = 1,
138 	},
139 	.attributes = {
140 		.attrs = synth_attrs,
141 		.name = "dtlk",
142 	},
143 };
144 
145 static inline bool synth_readable(void)
146 {
147 	synth_status = inb_p(speakup_info.port_tts + UART_RX);
148 	return (synth_status & TTS_READABLE) != 0;
149 }
150 
151 static inline bool synth_writable(void)
152 {
153 	synth_status = inb_p(speakup_info.port_tts + UART_RX);
154 	return (synth_status & TTS_WRITABLE) != 0;
155 }
156 
157 static inline bool synth_full(void)
158 {
159 	synth_status = inb_p(speakup_info.port_tts + UART_RX);
160 	return (synth_status & TTS_ALMOST_FULL) != 0;
161 }
162 
163 static void spk_out(const char ch)
164 {
165 	int timeout = SPK_XMITR_TIMEOUT;
166 
167 	while (!synth_writable()) {
168 		if (!--timeout)
169 			break;
170 		udelay(1);
171 	}
172 	outb_p(ch, speakup_info.port_tts);
173 	timeout = SPK_XMITR_TIMEOUT;
174 	while (synth_writable()) {
175 		if (!--timeout)
176 			break;
177 		udelay(1);
178 	}
179 }
180 
181 static void do_catch_up(struct spk_synth *synth)
182 {
183 	u_char ch;
184 	unsigned long flags;
185 	unsigned long jiff_max;
186 	struct var_t *jiffy_delta;
187 	struct var_t *delay_time;
188 	int jiffy_delta_val;
189 	int delay_time_val;
190 
191 	jiffy_delta = spk_get_var(JIFFY);
192 	delay_time = spk_get_var(DELAY);
193 	spin_lock_irqsave(&speakup_info.spinlock, flags);
194 	jiffy_delta_val = jiffy_delta->u.n.value;
195 	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
196 	jiff_max = jiffies + jiffy_delta_val;
197 	while (!kthread_should_stop()) {
198 		spin_lock_irqsave(&speakup_info.spinlock, flags);
199 		if (speakup_info.flushing) {
200 			speakup_info.flushing = 0;
201 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
202 			synth->flush(synth);
203 			continue;
204 		}
205 		synth_buffer_skip_nonlatin1();
206 		if (synth_buffer_empty()) {
207 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
208 			break;
209 		}
210 		set_current_state(TASK_INTERRUPTIBLE);
211 		delay_time_val = delay_time->u.n.value;
212 		spin_unlock_irqrestore(&speakup_info.spinlock, flags);
213 		if (synth_full()) {
214 			schedule_timeout(msecs_to_jiffies(delay_time_val));
215 			continue;
216 		}
217 		set_current_state(TASK_RUNNING);
218 		spin_lock_irqsave(&speakup_info.spinlock, flags);
219 		ch = synth_buffer_getc();
220 		spin_unlock_irqrestore(&speakup_info.spinlock, flags);
221 		if (ch == '\n')
222 			ch = PROCSPEECH;
223 		spk_out(ch);
224 		if (time_after_eq(jiffies, jiff_max) && (ch == SPACE)) {
225 			spk_out(PROCSPEECH);
226 			spin_lock_irqsave(&speakup_info.spinlock, flags);
227 			delay_time_val = delay_time->u.n.value;
228 			jiffy_delta_val = jiffy_delta->u.n.value;
229 			spin_unlock_irqrestore(&speakup_info.spinlock, flags);
230 			schedule_timeout(msecs_to_jiffies(delay_time_val));
231 			jiff_max = jiffies + jiffy_delta_val;
232 		}
233 	}
234 	spk_out(PROCSPEECH);
235 }
236 
237 static const char *synth_immediate(struct spk_synth *synth, const char *buf)
238 {
239 	u_char ch;
240 
241 	while ((ch = (u_char)*buf)) {
242 		if (synth_full())
243 			return buf;
244 		if (ch == '\n')
245 			ch = PROCSPEECH;
246 		spk_out(ch);
247 		buf++;
248 	}
249 	return NULL;
250 }
251 
252 static void synth_flush(struct spk_synth *synth)
253 {
254 	outb_p(SYNTH_CLEAR, speakup_info.port_tts);
255 	while (synth_writable())
256 		cpu_relax();
257 }
258 
259 static char synth_read_tts(void)
260 {
261 	u_char ch;
262 
263 	while (!synth_readable())
264 		cpu_relax();
265 	ch = synth_status & 0x7f;
266 	outb_p(ch, speakup_info.port_tts);
267 	while (synth_readable())
268 		cpu_relax();
269 	return (char)ch;
270 }
271 
272 /* interrogate the DoubleTalk PC and return its settings */
273 static struct synth_settings *synth_interrogate(struct spk_synth *synth)
274 {
275 	u_char *t;
276 	static char buf[sizeof(struct synth_settings) + 1];
277 	int total, i;
278 	static struct synth_settings status;
279 
280 	synth_immediate(synth, "\x18\x01?");
281 	for (total = 0, i = 0; i < 50; i++) {
282 		buf[total] = synth_read_tts();
283 		if (total > 2 && buf[total] == 0x7f)
284 			break;
285 		if (total < sizeof(struct synth_settings))
286 			total++;
287 	}
288 	t = buf;
289 	/* serial number is little endian */
290 	status.serial_number = t[0] + t[1] * 256;
291 	t += 2;
292 	for (i = 0; *t != '\r'; t++) {
293 		status.rom_version[i] = *t;
294 		if (i < sizeof(status.rom_version) - 1)
295 			i++;
296 	}
297 	status.rom_version[i] = 0;
298 	t++;
299 	status.mode = *t++;
300 	status.punc_level = *t++;
301 	status.formant_freq = *t++;
302 	status.pitch = *t++;
303 	status.speed = *t++;
304 	status.volume = *t++;
305 	status.tone = *t++;
306 	status.expression = *t++;
307 	status.ext_dict_loaded = *t++;
308 	status.ext_dict_status = *t++;
309 	status.free_ram = *t++;
310 	status.articulation = *t++;
311 	status.reverb = *t++;
312 	status.eob = *t++;
313 	return &status;
314 }
315 
316 static int synth_probe(struct spk_synth *synth)
317 {
318 	unsigned int port_val = 0;
319 	int i = 0;
320 	struct synth_settings *sp;
321 
322 	pr_info("Probing for DoubleTalk.\n");
323 	if (port_forced) {
324 		speakup_info.port_tts = port_forced;
325 		pr_info("probe forced to %x by kernel command line\n",
326 			speakup_info.port_tts);
327 		if ((port_forced & 0xf) != 0xf)
328 			pr_info("warning: port base should probably end with f\n");
329 		if (synth_request_region(speakup_info.port_tts - 1,
330 					 SYNTH_IO_EXTENT)) {
331 			pr_warn("sorry, port already reserved\n");
332 			return -EBUSY;
333 		}
334 		port_val = inw(speakup_info.port_tts - 1);
335 		synth_lpc = speakup_info.port_tts - 1;
336 	} else {
337 		for (i = 0; synth_portlist[i]; i++) {
338 			if (synth_request_region(synth_portlist[i],
339 						 SYNTH_IO_EXTENT))
340 				continue;
341 			port_val = inw(synth_portlist[i]) & 0xfbff;
342 			if (port_val == 0x107f) {
343 				synth_lpc = synth_portlist[i];
344 				speakup_info.port_tts = synth_lpc + 1;
345 				break;
346 			}
347 			synth_release_region(synth_portlist[i],
348 					     SYNTH_IO_EXTENT);
349 		}
350 	}
351 	port_val &= 0xfbff;
352 	if (port_val != 0x107f) {
353 		pr_info("DoubleTalk PC: not found\n");
354 		if (synth_lpc)
355 			synth_release_region(synth_lpc, SYNTH_IO_EXTENT);
356 		return -ENODEV;
357 	}
358 	while (inw_p(synth_lpc) != 0x147f)
359 		cpu_relax(); /* wait until it's ready */
360 	sp = synth_interrogate(synth);
361 	pr_info("%s: %03x-%03x, ROM ver %s, s/n %u, driver: %s\n",
362 		synth->long_name, synth_lpc, synth_lpc + SYNTH_IO_EXTENT - 1,
363 		sp->rom_version, sp->serial_number, synth->version);
364 	synth->alive = 1;
365 	return 0;
366 }
367 
368 static void dtlk_release(struct spk_synth *synth)
369 {
370 	spk_stop_serial_interrupt();
371 	if (speakup_info.port_tts)
372 		synth_release_region(speakup_info.port_tts - 1,
373 				     SYNTH_IO_EXTENT);
374 	speakup_info.port_tts = 0;
375 }
376 
377 module_param_hw_named(port, port_forced, int, ioport, 0444);
378 module_param_named(start, synth_dtlk.startup, short, 0444);
379 
380 MODULE_PARM_DESC(port, "Set the port for the synthesizer (override probing).");
381 MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");
382 
383 module_spk_synth(synth_dtlk);
384 
385 MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
386 MODULE_AUTHOR("David Borowski");
387 MODULE_DESCRIPTION("Speakup support for DoubleTalk PC synthesizers");
388 MODULE_LICENSE("GPL");
389 MODULE_VERSION(DRV_VERSION);
390 
391