aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/radio/radio-sf16fmr2.c
blob: f1e3714b5f16cdf017a4868ab5eb31ecb5899515 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
/* SF16-FMR2 and SF16-FMD2 radio driver for Linux
 * Copyright (c) 2011 Ondrej Zary
 *
 * Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
 * but almost nothing remained here after conversion to generic TEA575x
 * implementation
 */

#include <linux/delay.h>
#include <linux/module.h>	/* Modules 			*/
#include <linux/init.h>		/* Initdata			*/
#include <linux/slab.h>
#include <linux/ioport.h>	/* request_region		*/
#include <linux/io.h>		/* outb, outb_p			*/
#include <linux/isa.h>
#include <linux/pnp.h>
#include <media/tea575x.h>

MODULE_AUTHOR("Ondrej Zary");
MODULE_DESCRIPTION("MediaForte SF16-FMR2 and SF16-FMD2 FM radio card driver");
MODULE_LICENSE("GPL");

/* these cards can only use two different ports (0x384 and 0x284) */
#define FMR2_MAX 2

static int radio_nr[FMR2_MAX] = { [0 ... (FMR2_MAX - 1)] = -1 };
module_param_array(radio_nr, int, NULL, 0444);
MODULE_PARM_DESC(radio_nr, "Radio device numbers");

struct fmr2 {
	int io;
	struct v4l2_device v4l2_dev;
	struct snd_tea575x tea;
	struct v4l2_ctrl *volume;
	struct v4l2_ctrl *balance;
	bool is_fmd2;
};

static int num_fmr2_cards;
static struct fmr2 *fmr2_cards[FMR2_MAX];
static bool isa_registered;
static bool pnp_registered;

/* the port is hardwired on SF16-FMR2 */
#define FMR2_PORT	0x384

/* TEA575x tuner pins */
#define STR_DATA	(1 << 0)
#define STR_CLK		(1 << 1)
#define STR_WREN	(1 << 2)
#define STR_MOST	(1 << 3)
/* PT2254A/TC9154A volume control pins */
#define PT_ST		(1 << 4)
#define PT_CK		(1 << 5)
#define PT_DATA		(1 << 6)
/* volume control presence pin */
#define FMR2_HASVOL	(1 << 7)

static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
{
	struct fmr2 *fmr2 = tea->private_data;
	u8 bits = 0;

	bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
	bits |= (pins & TEA575X_CLK)  ? STR_CLK  : 0;
	/* WRITE_ENABLE is inverted, DATA must be high during read */
	bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;

	outb(bits, fmr2->io);
}

static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
{
	struct fmr2 *fmr2 = tea->private_data;
	u8 bits = inb(fmr2->io);

	return  (bits & STR_DATA) ? TEA575X_DATA : 0 |
		(bits & STR_MOST) ? TEA575X_MOST : 0;
}

static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
{
}

static struct snd_tea575x_ops fmr2_tea_ops = {
	.set_pins = fmr2_tea575x_set_pins,
	.get_pins = fmr2_tea575x_get_pins,
	.set_direction = fmr2_tea575x_set_direction,
};

/* TC9154A/PT2254A volume control */

/* 18-bit shift register bit definitions */
#define TC9154A_ATT_MAJ_0DB	(1 << 0)
#define TC9154A_ATT_MAJ_10DB	(1 << 1)
#define TC9154A_ATT_MAJ_20DB	(1 << 2)
#define TC9154A_ATT_MAJ_30DB	(1 << 3)
#define TC9154A_ATT_MAJ_40DB	(1 << 4)
#define TC9154A_ATT_MAJ_50DB	(1 << 5)
#define TC9154A_ATT_MAJ_60DB	(1 << 6)

#define TC9154A_ATT_MIN_0DB	(1 << 7)
#define TC9154A_ATT_MIN_2DB	(1 << 8)
#define TC9154A_ATT_MIN_4DB	(1 << 9)
#define TC9154A_ATT_MIN_6DB	(1 << 10)
#define TC9154A_ATT_MIN_8DB	(1 << 11)
/* bit 12 is ignored */
#define TC9154A_CHANNEL_LEFT	(1 << 13)
#define TC9154A_CHANNEL_RIGHT	(1 << 14)
/* bits 15, 16, 17 must be 0 */

#define	TC9154A_ATT_MAJ(x)	(1 << x)
#define TC9154A_ATT_MIN(x)	(1 << (7 + x))

static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
{
	if (!fmr2->tea.mute)
		pins |= STR_WREN;

	outb(pins, fmr2->io);
}

static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
{
	int i;
	u32 reg;
	u8 bit;

	reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
	reg |= channel;
	/* write 18-bit shift register, LSB first */
	for (i = 0; i < 18; i++) {
		bit = reg & (1 << i) ? PT_DATA : 0;
		tc9154a_set_pins(fmr2, bit);
		udelay(5);
		tc9154a_set_pins(fmr2, bit | PT_CK);
		udelay(5);
		tc9154a_set_pins(fmr2, bit);
	}

	/* latch register data */
	udelay(5);
	tc9154a_set_pins(fmr2, PT_ST);
	udelay(5);
	tc9154a_set_pins(fmr2, 0);
}

static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
	struct fmr2 *fmr2 = tea->private_data;
	int volume, balance, left, right;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME:
		volume = ctrl->val;
		balance = fmr2->balance->cur.val;
		break;
	case V4L2_CID_AUDIO_BALANCE:
		balance = ctrl->val;
		volume = fmr2->volume->cur.val;
		break;
	default:
		return -EINVAL;
	}

	left = right = volume;
	if (balance < 0)
		right = max(0, right + balance);
	if (balance > 0)
		left = max(0, left - balance);

	tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
	tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);

	return 0;
}

static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
	.s_ctrl = fmr2_s_ctrl,
};

static int fmr2_tea_ext_init(struct snd_tea575x *tea)
{
	struct fmr2 *fmr2 = tea->private_data;

	/* FMR2 can have volume control, FMD2 can't (uses SB16 mixer) */
	if (!fmr2->is_fmd2 && inb(fmr2->io) & FMR2_HASVOL) {
		fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
		fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
		if (tea->ctrl_handler.error) {
			printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
			return tea->ctrl_handler.error;
		}
	}

	return 0;
}

static struct pnp_device_id fmr2_pnp_ids[] = {
	{ .id = "MFRad13" }, /* tuner subdevice of SF16-FMD2 */
	{ .id = "" }
};
MODULE_DEVICE_TABLE(pnp, fmr2_pnp_ids);

static int fmr2_probe(struct fmr2 *fmr2, struct device *pdev, int io)
{
	int err, i;
	char *card_name = fmr2->is_fmd2 ? "SF16-FMD2" : "SF16-FMR2";

	/* avoid errors if a card was already registered at given port */
	for (i = 0; i < num_fmr2_cards; i++)
		if (io == fmr2_cards[i]->io)
			return -EBUSY;

	strlcpy(fmr2->v4l2_dev.name, "radio-sf16fmr2",
			sizeof(fmr2->v4l2_dev.name)),
	fmr2->io = io;

	if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
		printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
		return -EBUSY;
	}

	dev_set_drvdata(pdev, fmr2);
	err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
	if (err < 0) {
		v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
		release_region(fmr2->io, 2);
		return err;
	}
	fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
	fmr2->tea.private_data = fmr2;
	fmr2->tea.radio_nr = radio_nr[num_fmr2_cards];
	fmr2->tea.ops = &fmr2_tea_ops;
	fmr2->tea.ext_init = fmr2_tea_ext_init;
	strlcpy(fmr2->tea.card, card_name, sizeof(fmr2->tea.card));
	snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "%s:%s",
			fmr2->is_fmd2 ? "PnP" : "ISA", dev_name(pdev));

	if (snd_tea575x_init(&fmr2->tea, THIS_MODULE)) {
		printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
		release_region(fmr2->io, 2);
		return -ENODEV;
	}

	printk(KERN_INFO "radio-sf16fmr2: %s radio card at 0x%x.\n",
			card_name, fmr2->io);
	return 0;
}

static int fmr2_isa_match(struct device *pdev, unsigned int ndev)
{
	struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
	if (!fmr2)
		return 0;

	if (fmr2_probe(fmr2, pdev, FMR2_PORT)) {
		kfree(fmr2);
		return 0;
	}
	dev_set_drvdata(pdev, fmr2);
	fmr2_cards[num_fmr2_cards++] = fmr2;

	return 1;
}

static int fmr2_pnp_probe(struct pnp_dev *pdev, const struct pnp_device_id *id)
{
	int ret;
	struct fmr2 *fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
	if (!fmr2)
		return -ENOMEM;

	fmr2->is_fmd2 = true;
	ret = fmr2_probe(fmr2, &pdev->dev, pnp_port_start(pdev, 0));
	if (ret) {
		kfree(fmr2);
		return ret;
	}
	pnp_set_drvdata(pdev, fmr2);
	fmr2_cards[num_fmr2_cards++] = fmr2;

	return 0;
}

static void fmr2_remove(struct fmr2 *fmr2)
{
	snd_tea575x_exit(&fmr2->tea);
	release_region(fmr2->io, 2);
	v4l2_device_unregister(&fmr2->v4l2_dev);
	kfree(fmr2);
}

static int fmr2_isa_remove(struct device *pdev, unsigned int ndev)
{
	fmr2_remove(dev_get_drvdata(pdev));
	dev_set_drvdata(pdev, NULL);

	return 0;
}

static void fmr2_pnp_remove(struct pnp_dev *pdev)
{
	fmr2_remove(pnp_get_drvdata(pdev));
	pnp_set_drvdata(pdev, NULL);
}

struct isa_driver fmr2_isa_driver = {
	.match		= fmr2_isa_match,
	.remove		= fmr2_isa_remove,
	.driver		= {
		.name	= "radio-sf16fmr2",
	},
};

struct pnp_driver fmr2_pnp_driver = {
	.name		= "radio-sf16fmr2",
	.id_table	= fmr2_pnp_ids,
	.probe		= fmr2_pnp_probe,
	.remove		= fmr2_pnp_remove,
};

static int __init fmr2_init(void)
{
	int ret;

	ret = pnp_register_driver(&fmr2_pnp_driver);
	if (!ret)
		pnp_registered = true;
	ret = isa_register_driver(&fmr2_isa_driver, 1);
	if (!ret)
		isa_registered = true;

	return (pnp_registered || isa_registered) ? 0 : ret;
}

static void __exit fmr2_exit(void)
{
	if (pnp_registered)
		pnp_unregister_driver(&fmr2_pnp_driver);
	if (isa_registered)
		isa_unregister_driver(&fmr2_isa_driver);
}

module_init(fmr2_init);
module_exit(fmr2_exit);