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
30static 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
71static int io = CONFIG_RADIO_TRUST_PORT;
72static int radio_nr = -1;
73static int ioval = 0xf;
74static __u16 curvol;
75static __u16 curbass;
76static __u16 curtreble;
77static unsigned long curfreq;
78static int curstereo;
79static 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
91static 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
137static void tr_setvol(__u16 vol)
138{
139	curvol = vol / 2048;
140	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
141}
142
143static int basstreble2chip[15] = {
144	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
145};
146
147static void tr_setbass(__u16 bass)
148{
149	curbass = bass / 4370;
150	write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
151}
152
153static void tr_settreble(__u16 treble)
154{
155	curtreble = treble / 4370;
156	write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
157}
158
159static void tr_setstereo(int stereo)
160{
161	curstereo = !!stereo;
162	ioval = (ioval & 0xfb) | (!curstereo << 2);
163	outb(ioval, io);
164}
165
166static void tr_setmute(int mute)
167{
168	curmute = !!mute;
169	ioval = (ioval & 0xf7) | (curmute << 3);
170	outb(ioval, io);
171}
172
173static 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
181static int tr_getstereo(void)
182{
183	/* don't know how to determine it, just return the setting */
184	return curstereo;
185}
186
187static 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
195static 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
206static 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
226static 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
235static 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
243static 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
251static 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
266static 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
286static 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
306static 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
317static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
318{
319	*i = 0;
320	return 0;
321}
322
323static 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
330static 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
338static 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
347static struct video_device trust_radio=
348{
349	.owner		= THIS_MODULE,
350	.name		= "Trust FM Radio",
351	.type		= VID_TYPE_TUNER,
352	.hardware	= 0,
353	.fops           = &trust_fops,
354	.vidioc_querycap    = vidioc_querycap,
355	.vidioc_g_tuner     = vidioc_g_tuner,
356	.vidioc_s_tuner     = vidioc_s_tuner,
357	.vidioc_g_frequency = vidioc_g_frequency,
358	.vidioc_s_frequency = vidioc_s_frequency,
359	.vidioc_queryctrl   = vidioc_queryctrl,
360	.vidioc_g_ctrl      = vidioc_g_ctrl,
361	.vidioc_s_ctrl      = vidioc_s_ctrl,
362	.vidioc_g_audio     = vidioc_g_audio,
363	.vidioc_s_audio     = vidioc_s_audio,
364	.vidioc_g_input     = vidioc_g_input,
365	.vidioc_s_input     = vidioc_s_input,
366};
367
368static int __init trust_init(void)
369{
370	if(io == -1) {
371		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
372		return -EINVAL;
373	}
374	if(!request_region(io, 2, "Trust FM Radio")) {
375		printk(KERN_ERR "trust: port 0x%x already in use\n", io);
376		return -EBUSY;
377	}
378	if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
379	{
380		release_region(io, 2);
381		return -EINVAL;
382	}
383
384	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");
385
386	write_i2c(2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
387	write_i2c(2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
388	write_i2c(2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
389	write_i2c(2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
390	write_i2c(2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */
391
392	tr_setvol(0x8000);
393	tr_setbass(0x8000);
394	tr_settreble(0x8000);
395	tr_setstereo(1);
396
397	/* mute card - prevents noisy bootups */
398	tr_setmute(1);
399
400	return 0;
401}
402
403MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
404MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
405MODULE_LICENSE("GPL");
406
407module_param(io, int, 0);
408MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
409module_param(radio_nr, int, 0);
410
411static void __exit cleanup_trust_module(void)
412{
413	video_unregister_device(&trust_radio);
414	release_region(io, 2);
415}
416
417module_init(trust_init);
418module_exit(cleanup_trust_module);
419