1 /* radio-trust.c - Trust FM Radio card driver for Linux 2.2
2  * by Eric Lammerts <eric@scintilla.utwente.nl>
3  *
4  * Based on radio-aztech.c. Original notes:
5  *
6  * Adapted to support the Video for Linux API by
7  * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
8  *
9  * Quay Ly
10  * Donald Song
11  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
12  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
13  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
14  *
15  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
16  */
17 
18 #include <stdarg.h>
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/ioport.h>
22 #include <asm/io.h>
23 #include <asm/uaccess.h>
24 #include <linux/videodev2.h>
25 #include <media/v4l2-common.h>
26 #include <media/v4l2-ioctl.h>
27 
28 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
29 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
30 
31 static struct v4l2_queryctrl radio_qctrl[] = {
32 	{
33 		.id            = V4L2_CID_AUDIO_MUTE,
34 		.name          = "Mute",
35 		.minimum       = 0,
36 		.maximum       = 1,
37 		.default_value = 1,
38 		.type          = V4L2_CTRL_TYPE_BOOLEAN,
39 	},{
40 		.id            = V4L2_CID_AUDIO_VOLUME,
41 		.name          = "Volume",
42 		.minimum       = 0,
43 		.maximum       = 65535,
44 		.step          = 2048,
45 		.default_value = 65535,
46 		.type          = V4L2_CTRL_TYPE_INTEGER,
47 	},{
48 		.id            = V4L2_CID_AUDIO_BASS,
49 		.name          = "Bass",
50 		.minimum       = 0,
51 		.maximum       = 65535,
52 		.step          = 4370,
53 		.default_value = 32768,
54 		.type          = V4L2_CTRL_TYPE_INTEGER,
55 	},{
56 		.id            = V4L2_CID_AUDIO_TREBLE,
57 		.name          = "Treble",
58 		.minimum       = 0,
59 		.maximum       = 65535,
60 		.step          = 4370,
61 		.default_value = 32768,
62 		.type          = V4L2_CTRL_TYPE_INTEGER,
63 	},
64 };
65 
66 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
67 
68 #ifndef CONFIG_RADIO_TRUST_PORT
69 #define CONFIG_RADIO_TRUST_PORT -1
70 #endif
71 
72 static int io = CONFIG_RADIO_TRUST_PORT;
73 static int radio_nr = -1;
74 static int ioval = 0xf;
75 static __u16 curvol;
76 static __u16 curbass;
77 static __u16 curtreble;
78 static unsigned long curfreq;
79 static int curstereo;
80 static int curmute;
81 
82 /* i2c addresses */
83 #define TDA7318_ADDR 0x88
84 #define TSA6060T_ADDR 0xc4
85 
86 #define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
87 #define TR_SET_SCL outb(ioval |= 2, io)
88 #define TR_CLR_SCL outb(ioval &= 0xfd, io)
89 #define TR_SET_SDA outb(ioval |= 1, io)
90 #define TR_CLR_SDA outb(ioval &= 0xfe, io)
91 
92 static void write_i2c(int n, ...)
93 {
94 	unsigned char val, mask;
95 	va_list args;
96 
97 	va_start(args, n);
98 
99 	/* start condition */
100 	TR_SET_SDA;
101 	TR_SET_SCL;
102 	TR_DELAY;
103 	TR_CLR_SDA;
104 	TR_CLR_SCL;
105 	TR_DELAY;
106 
107 	for(; n; n--) {
108 		val = va_arg(args, unsigned);
109 		for(mask = 0x80; mask; mask >>= 1) {
110 			if(val & mask)
111 				TR_SET_SDA;
112 			else
113 				TR_CLR_SDA;
114 			TR_SET_SCL;
115 			TR_DELAY;
116 			TR_CLR_SCL;
117 			TR_DELAY;
118 		}
119 		/* acknowledge bit */
120 		TR_SET_SDA;
121 		TR_SET_SCL;
122 		TR_DELAY;
123 		TR_CLR_SCL;
124 		TR_DELAY;
125 	}
126 
127 	/* stop condition */
128 	TR_CLR_SDA;
129 	TR_DELAY;
130 	TR_SET_SCL;
131 	TR_DELAY;
132 	TR_SET_SDA;
133 	TR_DELAY;
134 
135 	va_end(args);
136 }
137 
138 static void tr_setvol(__u16 vol)
139 {
140 	curvol = vol / 2048;
141 	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
142 }
143 
144 static int basstreble2chip[15] = {
145 	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
146 };
147 
148 static void tr_setbass(__u16 bass)
149 {
150 	curbass = bass / 4370;
151 	write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
152 }
153 
154 static void tr_settreble(__u16 treble)
155 {
156 	curtreble = treble / 4370;
157 	write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
158 }
159 
160 static void tr_setstereo(int stereo)
161 {
162 	curstereo = !!stereo;
163 	ioval = (ioval & 0xfb) | (!curstereo << 2);
164 	outb(ioval, io);
165 }
166 
167 static void tr_setmute(int mute)
168 {
169 	curmute = !!mute;
170 	ioval = (ioval & 0xf7) | (curmute << 3);
171 	outb(ioval, io);
172 }
173 
174 static int tr_getsigstr(void)
175 {
176 	int i, v;
177 
178 	for(i = 0, v = 0; i < 100; i++) v |= inb(io);
179 	return (v & 1)? 0 : 0xffff;
180 }
181 
182 static int tr_getstereo(void)
183 {
184 	/* don't know how to determine it, just return the setting */
185 	return curstereo;
186 }
187 
188 static void tr_setfreq(unsigned long f)
189 {
190 	f /= 160;	/* Convert to 10 kHz units	*/
191 	f += 1070;	/* Add 10.7 MHz IF			*/
192 
193 	write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
194 }
195 
196 static int vidioc_querycap(struct file *file, void *priv,
197 				struct v4l2_capability *v)
198 {
199 	strlcpy(v->driver, "radio-trust", sizeof(v->driver));
200 	strlcpy(v->card, "Trust FM Radio", sizeof(v->card));
201 	sprintf(v->bus_info, "ISA");
202 	v->version = RADIO_VERSION;
203 	v->capabilities = V4L2_CAP_TUNER;
204 	return 0;
205 }
206 
207 static int vidioc_g_tuner(struct file *file, void *priv,
208 				struct v4l2_tuner *v)
209 {
210 	if (v->index > 0)
211 		return -EINVAL;
212 
213 	strcpy(v->name, "FM");
214 	v->type = V4L2_TUNER_RADIO;
215 	v->rangelow = (87.5*16000);
216 	v->rangehigh = (108*16000);
217 	v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
218 	v->capability = V4L2_TUNER_CAP_LOW;
219 	if (tr_getstereo())
220 		v->audmode = V4L2_TUNER_MODE_STEREO;
221 	else
222 		v->audmode = V4L2_TUNER_MODE_MONO;
223 	v->signal = tr_getsigstr();
224 	return 0;
225 }
226 
227 static int vidioc_s_tuner(struct file *file, void *priv,
228 				struct v4l2_tuner *v)
229 {
230 	if (v->index > 0)
231 		return -EINVAL;
232 
233 	return 0;
234 }
235 
236 static int vidioc_s_frequency(struct file *file, void *priv,
237 				struct v4l2_frequency *f)
238 {
239 	curfreq = f->frequency;
240 	tr_setfreq(curfreq);
241 	return 0;
242 }
243 
244 static int vidioc_g_frequency(struct file *file, void *priv,
245 				struct v4l2_frequency *f)
246 {
247 	f->type = V4L2_TUNER_RADIO;
248 	f->frequency = curfreq;
249 	return 0;
250 }
251 
252 static int vidioc_queryctrl(struct file *file, void *priv,
253 				struct v4l2_queryctrl *qc)
254 {
255 	int i;
256 
257 	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
258 		if (qc->id && qc->id == radio_qctrl[i].id) {
259 			memcpy(qc, &(radio_qctrl[i]),
260 						sizeof(*qc));
261 			return 0;
262 		}
263 	}
264 	return -EINVAL;
265 }
266 
267 static int vidioc_g_ctrl(struct file *file, void *priv,
268 				struct v4l2_control *ctrl)
269 {
270 	switch (ctrl->id) {
271 	case V4L2_CID_AUDIO_MUTE:
272 		ctrl->value = curmute;
273 		return 0;
274 	case V4L2_CID_AUDIO_VOLUME:
275 		ctrl->value = curvol * 2048;
276 		return 0;
277 	case V4L2_CID_AUDIO_BASS:
278 		ctrl->value = curbass * 4370;
279 		return 0;
280 	case V4L2_CID_AUDIO_TREBLE:
281 		ctrl->value = curtreble * 4370;
282 		return 0;
283 	}
284 	return -EINVAL;
285 }
286 
287 static int vidioc_s_ctrl(struct file *file, void *priv,
288 				struct v4l2_control *ctrl)
289 {
290 	switch (ctrl->id) {
291 	case V4L2_CID_AUDIO_MUTE:
292 		tr_setmute(ctrl->value);
293 		return 0;
294 	case V4L2_CID_AUDIO_VOLUME:
295 		tr_setvol(ctrl->value);
296 		return 0;
297 	case V4L2_CID_AUDIO_BASS:
298 		tr_setbass(ctrl->value);
299 		return 0;
300 	case V4L2_CID_AUDIO_TREBLE:
301 		tr_settreble(ctrl->value);
302 		return 0;
303 	}
304 	return -EINVAL;
305 }
306 
307 static int vidioc_g_audio(struct file *file, void *priv,
308 				struct v4l2_audio *a)
309 {
310 	if (a->index > 1)
311 		return -EINVAL;
312 
313 	strcpy(a->name, "Radio");
314 	a->capability = V4L2_AUDCAP_STEREO;
315 	return 0;
316 }
317 
318 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
319 {
320 	*i = 0;
321 	return 0;
322 }
323 
324 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
325 {
326 	if (i != 0)
327 		return -EINVAL;
328 	return 0;
329 }
330 
331 static int vidioc_s_audio(struct file *file, void *priv,
332 				struct v4l2_audio *a)
333 {
334 	if (a->index != 0)
335 		return -EINVAL;
336 	return 0;
337 }
338 
339 static const struct file_operations trust_fops = {
340 	.owner		= THIS_MODULE,
341 	.open           = video_exclusive_open,
342 	.release        = video_exclusive_release,
343 	.ioctl		= video_ioctl2,
344 #ifdef CONFIG_COMPAT
345 	.compat_ioctl	= v4l_compat_ioctl32,
346 #endif
347 	.llseek         = no_llseek,
348 };
349 
350 static const struct v4l2_ioctl_ops trust_ioctl_ops = {
351 	.vidioc_querycap    = vidioc_querycap,
352 	.vidioc_g_tuner     = vidioc_g_tuner,
353 	.vidioc_s_tuner     = vidioc_s_tuner,
354 	.vidioc_g_frequency = vidioc_g_frequency,
355 	.vidioc_s_frequency = vidioc_s_frequency,
356 	.vidioc_queryctrl   = vidioc_queryctrl,
357 	.vidioc_g_ctrl      = vidioc_g_ctrl,
358 	.vidioc_s_ctrl      = vidioc_s_ctrl,
359 	.vidioc_g_audio     = vidioc_g_audio,
360 	.vidioc_s_audio     = vidioc_s_audio,
361 	.vidioc_g_input     = vidioc_g_input,
362 	.vidioc_s_input     = vidioc_s_input,
363 };
364 
365 static struct video_device trust_radio = {
366 	.name		= "Trust FM Radio",
367 	.fops           = &trust_fops,
368 	.ioctl_ops 	= &trust_ioctl_ops,
369 };
370 
371 static int __init trust_init(void)
372 {
373 	if(io == -1) {
374 		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
375 		return -EINVAL;
376 	}
377 	if(!request_region(io, 2, "Trust FM Radio")) {
378 		printk(KERN_ERR "trust: port 0x%x already in use\n", io);
379 		return -EBUSY;
380 	}
381 	if (video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
382 		release_region(io, 2);
383 		return -EINVAL;
384 	}
385 
386 	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");
387 
388 	write_i2c(2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
389 	write_i2c(2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
390 	write_i2c(2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
391 	write_i2c(2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
392 	write_i2c(2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */
393 
394 	tr_setvol(0x8000);
395 	tr_setbass(0x8000);
396 	tr_settreble(0x8000);
397 	tr_setstereo(1);
398 
399 	/* mute card - prevents noisy bootups */
400 	tr_setmute(1);
401 
402 	return 0;
403 }
404 
405 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
406 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
407 MODULE_LICENSE("GPL");
408 
409 module_param(io, int, 0);
410 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
411 module_param(radio_nr, int, 0);
412 
413 static void __exit cleanup_trust_module(void)
414 {
415 	video_unregister_device(&trust_radio);
416 	release_region(io, 2);
417 }
418 
419 module_init(trust_init);
420 module_exit(cleanup_trust_module);
421