summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-sf16fmr2.c
blob: 7ab9afadf29b7f2b4e788f6fd644225cdb8ffb0a (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
/* SF16-FMR2 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/ioport.h>	/* request_region		*/
#include <linux/io.h>		/* outb, outb_p			*/
#include <sound/tea575x-tuner.h>

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

struct fmr2 {
	int io;
	struct snd_tea575x tea;
	struct v4l2_ctrl *volume;
	struct v4l2_ctrl *balance;
};

/* the port is hardwired so no need to support multiple cards */
#define FMR2_PORT	0x384
static struct fmr2 fmr2_card;

/* 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;

	if (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 int __init fmr2_init(void)
{
	struct fmr2 *fmr2 = &fmr2_card;

	fmr2->io = FMR2_PORT;

	if (!request_region(fmr2->io, 2, "SF16-FMR2")) {
		printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
		return -EBUSY;
	}

	fmr2->tea.private_data = fmr2;
	fmr2->tea.ops = &fmr2_tea_ops;
	fmr2->tea.ext_init = fmr2_tea_ext_init;
	strlcpy(fmr2->tea.card, "SF16-FMR2", sizeof(fmr2->tea.card));
	strcpy(fmr2->tea.bus_info, "ISA");

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

	printk(KERN_INFO "radio-sf16fmr2: SF16-FMR2 radio card at 0x%x.\n", fmr2->io);
	return 0;
}

static void __exit fmr2_exit(void)
{
	struct fmr2 *fmr2 = &fmr2_card;

	snd_tea575x_exit(&fmr2->tea);
	release_region(fmr2->io, 2);
}

module_init(fmr2_init);
module_exit(fmr2_exit);
OpenPOWER on IntegriCloud