xref: /openbmc/linux/drivers/media/radio/radio-trust.c (revision 8fa5723aa7e053d498336b48448b292fc2e0458b) 
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 static unsigned long in_use;
82 
83 /* i2c addresses */
84 #define TDA7318_ADDR 0x88
85 #define TSA6060T_ADDR 0xc4
86 
87 #define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
88 #define TR_SET_SCL outb(ioval |= 2, io)
89 #define TR_CLR_SCL outb(ioval &= 0xfd, io)
90 #define TR_SET_SDA outb(ioval |= 1, io)
91 #define TR_CLR_SDA outb(ioval &= 0xfe, io)
92 
93 static void write_i2c(int n, ...)
94 {
95 	unsigned char val, mask;
96 	va_list args;
97 
98 	va_start(args, n);
99 
100 	/* start condition */
101 	TR_SET_SDA;
102 	TR_SET_SCL;
103 	TR_DELAY;
104 	TR_CLR_SDA;
105 	TR_CLR_SCL;
106 	TR_DELAY;
107 
108 	for(; n; n--) {
109 		val = va_arg(args, unsigned);
110 		for(mask = 0x80; mask; mask >>= 1) {
111 			if(val & mask)
112 				TR_SET_SDA;
113 			else
114 				TR_CLR_SDA;
115 			TR_SET_SCL;
116 			TR_DELAY;
117 			TR_CLR_SCL;
118 			TR_DELAY;
119 		}
120 		/* acknowledge bit */
121 		TR_SET_SDA;
122 		TR_SET_SCL;
123 		TR_DELAY;
124 		TR_CLR_SCL;
125 		TR_DELAY;
126 	}
127 
128 	/* stop condition */
129 	TR_CLR_SDA;
130 	TR_DELAY;
131 	TR_SET_SCL;
132 	TR_DELAY;
133 	TR_SET_SDA;
134 	TR_DELAY;
135 
136 	va_end(args);
137 }
138 
139 static void tr_setvol(__u16 vol)
140 {
141 	curvol = vol / 2048;
142 	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
143 }
144 
145 static int basstreble2chip[15] = {
146 	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
147 };
148 
149 static void tr_setbass(__u16 bass)
150 {
151 	curbass = bass / 4370;
152 	write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
153 }
154 
155 static void tr_settreble(__u16 treble)
156 {
157 	curtreble = treble / 4370;
158 	write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
159 }
160 
161 static void tr_setstereo(int stereo)
162 {
163 	curstereo = !!stereo;
164 	ioval = (ioval & 0xfb) | (!curstereo << 2);
165 	outb(ioval, io);
166 }
167 
168 static void tr_setmute(int mute)
169 {
170 	curmute = !!mute;
171 	ioval = (ioval & 0xf7) | (curmute << 3);
172 	outb(ioval, io);
173 }
174 
175 static int tr_getsigstr(void)
176 {
177 	int i, v;
178 
179 	for(i = 0, v = 0; i < 100; i++) v |= inb(io);
180 	return (v & 1)? 0 : 0xffff;
181 }
182 
183 static int tr_getstereo(void)
184 {
185 	/* don't know how to determine it, just return the setting */
186 	return curstereo;
187 }
188 
189 static void tr_setfreq(unsigned long f)
190 {
191 	f /= 160;	/* Convert to 10 kHz units	*/
192 	f += 1070;	/* Add 10.7 MHz IF			*/
193 
194 	write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
195 }
196 
197 static int vidioc_querycap(struct file *file, void *priv,
198 				struct v4l2_capability *v)
199 {
200 	strlcpy(v->driver, "radio-trust", sizeof(v->driver));
201 	strlcpy(v->card, "Trust FM Radio", sizeof(v->card));
202 	sprintf(v->bus_info, "ISA");
203 	v->version = RADIO_VERSION;
204 	v->capabilities = V4L2_CAP_TUNER;
205 	return 0;
206 }
207 
208 static int vidioc_g_tuner(struct file *file, void *priv,
209 				struct v4l2_tuner *v)
210 {
211 	if (v->index > 0)
212 		return -EINVAL;
213 
214 	strcpy(v->name, "FM");
215 	v->type = V4L2_TUNER_RADIO;
216 	v->rangelow = (87.5*16000);
217 	v->rangehigh = (108*16000);
218 	v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
219 	v->capability = V4L2_TUNER_CAP_LOW;
220 	if (tr_getstereo())
221 		v->audmode = V4L2_TUNER_MODE_STEREO;
222 	else
223 		v->audmode = V4L2_TUNER_MODE_MONO;
224 	v->signal = tr_getsigstr();
225 	return 0;
226 }
227 
228 static int vidioc_s_tuner(struct file *file, void *priv,
229 				struct v4l2_tuner *v)
230 {
231 	if (v->index > 0)
232 		return -EINVAL;
233 
234 	return 0;
235 }
236 
237 static int vidioc_s_frequency(struct file *file, void *priv,
238 				struct v4l2_frequency *f)
239 {
240 	curfreq = f->frequency;
241 	tr_setfreq(curfreq);
242 	return 0;
243 }
244 
245 static int vidioc_g_frequency(struct file *file, void *priv,
246 				struct v4l2_frequency *f)
247 {
248 	f->type = V4L2_TUNER_RADIO;
249 	f->frequency = curfreq;
250 	return 0;
251 }
252 
253 static int vidioc_queryctrl(struct file *file, void *priv,
254 				struct v4l2_queryctrl *qc)
255 {
256 	int i;
257 
258 	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
259 		if (qc->id && qc->id == radio_qctrl[i].id) {
260 			memcpy(qc, &(radio_qctrl[i]),
261 						sizeof(*qc));
262 			return 0;
263 		}
264 	}
265 	return -EINVAL;
266 }
267 
268 static int vidioc_g_ctrl(struct file *file, void *priv,
269 				struct v4l2_control *ctrl)
270 {
271 	switch (ctrl->id) {
272 	case V4L2_CID_AUDIO_MUTE:
273 		ctrl->value = curmute;
274 		return 0;
275 	case V4L2_CID_AUDIO_VOLUME:
276 		ctrl->value = curvol * 2048;
277 		return 0;
278 	case V4L2_CID_AUDIO_BASS:
279 		ctrl->value = curbass * 4370;
280 		return 0;
281 	case V4L2_CID_AUDIO_TREBLE:
282 		ctrl->value = curtreble * 4370;
283 		return 0;
284 	}
285 	return -EINVAL;
286 }
287 
288 static int vidioc_s_ctrl(struct file *file, void *priv,
289 				struct v4l2_control *ctrl)
290 {
291 	switch (ctrl->id) {
292 	case V4L2_CID_AUDIO_MUTE:
293 		tr_setmute(ctrl->value);
294 		return 0;
295 	case V4L2_CID_AUDIO_VOLUME:
296 		tr_setvol(ctrl->value);
297 		return 0;
298 	case V4L2_CID_AUDIO_BASS:
299 		tr_setbass(ctrl->value);
300 		return 0;
301 	case V4L2_CID_AUDIO_TREBLE:
302 		tr_settreble(ctrl->value);
303 		return 0;
304 	}
305 	return -EINVAL;
306 }
307 
308 static int vidioc_g_audio(struct file *file, void *priv,
309 				struct v4l2_audio *a)
310 {
311 	if (a->index > 1)
312 		return -EINVAL;
313 
314 	strcpy(a->name, "Radio");
315 	a->capability = V4L2_AUDCAP_STEREO;
316 	return 0;
317 }
318 
319 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
320 {
321 	*i = 0;
322 	return 0;
323 }
324 
325 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
326 {
327 	if (i != 0)
328 		return -EINVAL;
329 	return 0;
330 }
331 
332 static int vidioc_s_audio(struct file *file, void *priv,
333 				struct v4l2_audio *a)
334 {
335 	if (a->index != 0)
336 		return -EINVAL;
337 	return 0;
338 }
339 
340 static int trust_exclusive_open(struct inode *inode, struct file *file)
341 {
342 	return test_and_set_bit(0, &in_use) ? -EBUSY : 0;
343 }
344 
345 static int trust_exclusive_release(struct inode *inode, struct file *file)
346 {
347 	clear_bit(0, &in_use);
348 	return 0;
349 }
350 
351 static const struct file_operations trust_fops = {
352 	.owner		= THIS_MODULE,
353 	.open           = trust_exclusive_open,
354 	.release        = trust_exclusive_release,
355 	.ioctl		= video_ioctl2,
356 #ifdef CONFIG_COMPAT
357 	.compat_ioctl	= v4l_compat_ioctl32,
358 #endif
359 	.llseek         = no_llseek,
360 };
361 
362 static const struct v4l2_ioctl_ops trust_ioctl_ops = {
363 	.vidioc_querycap    = vidioc_querycap,
364 	.vidioc_g_tuner     = vidioc_g_tuner,
365 	.vidioc_s_tuner     = vidioc_s_tuner,
366 	.vidioc_g_frequency = vidioc_g_frequency,
367 	.vidioc_s_frequency = vidioc_s_frequency,
368 	.vidioc_queryctrl   = vidioc_queryctrl,
369 	.vidioc_g_ctrl      = vidioc_g_ctrl,
370 	.vidioc_s_ctrl      = vidioc_s_ctrl,
371 	.vidioc_g_audio     = vidioc_g_audio,
372 	.vidioc_s_audio     = vidioc_s_audio,
373 	.vidioc_g_input     = vidioc_g_input,
374 	.vidioc_s_input     = vidioc_s_input,
375 };
376 
377 static struct video_device trust_radio = {
378 	.name		= "Trust FM Radio",
379 	.fops           = &trust_fops,
380 	.ioctl_ops 	= &trust_ioctl_ops,
381 	.release	= video_device_release_empty,
382 };
383 
384 static int __init trust_init(void)
385 {
386 	if(io == -1) {
387 		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
388 		return -EINVAL;
389 	}
390 	if(!request_region(io, 2, "Trust FM Radio")) {
391 		printk(KERN_ERR "trust: port 0x%x already in use\n", io);
392 		return -EBUSY;
393 	}
394 	if (video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
395 		release_region(io, 2);
396 		return -EINVAL;
397 	}
398 
399 	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");
400 
401 	write_i2c(2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
402 	write_i2c(2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
403 	write_i2c(2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
404 	write_i2c(2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
405 	write_i2c(2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */
406 
407 	tr_setvol(0x8000);
408 	tr_setbass(0x8000);
409 	tr_settreble(0x8000);
410 	tr_setstereo(1);
411 
412 	/* mute card - prevents noisy bootups */
413 	tr_setmute(1);
414 
415 	return 0;
416 }
417 
418 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
419 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
420 MODULE_LICENSE("GPL");
421 
422 module_param(io, int, 0);
423 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
424 module_param(radio_nr, int, 0);
425 
426 static void __exit cleanup_trust_module(void)
427 {
428 	video_unregister_device(&trust_radio);
429 	release_region(io, 2);
430 }
431 
432 module_init(trust_init);
433 module_exit(cleanup_trust_module);
434