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