1 /* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
2  * (c) 1999 R. Offermanns (rolf@offermanns.de)
3  * based on the aimslab radio driver from M. Kirkwood
4  * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
5  *
6  *
7  * History:
8  * 1999-05-21	First preview release
9  *
10  *  Notes on the hardware:
11  *  There are two "main" chips on the card:
12  *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
13  *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
14  *  (you can get the datasheet at the above links)
15  *
16  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
17  *  Volume Control is done digitally
18  *
19  * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
20  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
21  */
22 
23 #include <linux/module.h>	/* Modules 			*/
24 #include <linux/init.h>		/* Initdata			*/
25 #include <linux/ioport.h>	/* request_region		*/
26 #include <linux/videodev2.h>	/* kernel radio structs		*/
27 #include <linux/mutex.h>
28 #include <linux/io.h>		/* outb, outb_p			*/
29 #include <linux/slab.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ioctl.h>
32 #include "radio-isa.h"
33 
34 MODULE_AUTHOR("R. Offermans & others");
35 MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
36 MODULE_LICENSE("GPL");
37 MODULE_VERSION("0.1.99");
38 
39 /* Note: there seems to be only one possible port (0x590), but without
40    hardware this is hard to verify. For now, this is the only one we will
41    support. */
42 static int io = 0x590;
43 static int radio_nr = -1;
44 
45 module_param(radio_nr, int, 0444);
46 MODULE_PARM_DESC(radio_nr, "Radio device number");
47 
48 #define WRT_DIS 	0x00
49 #define CLK_OFF		0x00
50 #define IIC_DATA	0x01
51 #define IIC_CLK		0x02
52 #define DATA		0x04
53 #define CLK_ON 		0x08
54 #define WRT_EN		0x10
55 
56 static struct radio_isa_card *terratec_alloc(void)
57 {
58 	return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
59 }
60 
61 static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
62 {
63 	int i;
64 
65 	if (mute)
66 		vol = 0;
67 	vol = vol + (vol * 32); /* change both channels */
68 	for (i = 0; i < 8; i++) {
69 		if (vol & (0x80 >> i))
70 			outb(0x80, isa->io + 1);
71 		else
72 			outb(0x00, isa->io + 1);
73 	}
74 	return 0;
75 }
76 
77 
78 /* this is the worst part in this driver */
79 /* many more or less strange things are going on here, but hey, it works :) */
80 
81 static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
82 {
83 	int i;
84 	int p;
85 	int temp;
86 	long rest;
87 	unsigned char buffer[25];		/* we have to bit shift 25 registers */
88 
89 	freq = freq / 160;			/* convert the freq. to a nice to handle value */
90 	memset(buffer, 0, sizeof(buffer));
91 
92 	rest = freq * 10 + 10700;	/* I once had understood what is going on here */
93 					/* maybe some wise guy (friedhelm?) can comment this stuff */
94 	i = 13;
95 	p = 10;
96 	temp = 102400;
97 	while (rest != 0) {
98 		if (rest % temp  == rest)
99 			buffer[i] = 0;
100 		else {
101 			buffer[i] = 1;
102 			rest = rest - temp;
103 		}
104 		i--;
105 		p--;
106 		temp = temp / 2;
107 	}
108 
109 	for (i = 24; i > -1; i--) {	/* bit shift the values to the radiocard */
110 		if (buffer[i] == 1) {
111 			outb(WRT_EN | DATA, isa->io);
112 			outb(WRT_EN | DATA | CLK_ON, isa->io);
113 			outb(WRT_EN | DATA, isa->io);
114 		} else {
115 			outb(WRT_EN | 0x00, isa->io);
116 			outb(WRT_EN | 0x00 | CLK_ON, isa->io);
117 		}
118 	}
119 	outb(0x00, isa->io);
120 	return 0;
121 }
122 
123 static u32 terratec_g_signal(struct radio_isa_card *isa)
124 {
125 	/* bit set = no signal present	*/
126 	return (inb(isa->io) & 2) ? 0 : 0xffff;
127 }
128 
129 static const struct radio_isa_ops terratec_ops = {
130 	.alloc = terratec_alloc,
131 	.s_mute_volume = terratec_s_mute_volume,
132 	.s_frequency = terratec_s_frequency,
133 	.g_signal = terratec_g_signal,
134 };
135 
136 static const int terratec_ioports[] = { 0x590 };
137 
138 static struct radio_isa_driver terratec_driver = {
139 	.driver = {
140 		.match		= radio_isa_match,
141 		.probe		= radio_isa_probe,
142 		.remove		= radio_isa_remove,
143 		.driver		= {
144 			.name	= "radio-terratec",
145 		},
146 	},
147 	.io_params = &io,
148 	.radio_nr_params = &radio_nr,
149 	.io_ports = terratec_ioports,
150 	.num_of_io_ports = ARRAY_SIZE(terratec_ioports),
151 	.region_size = 2,
152 	.card = "TerraTec ActiveRadio",
153 	.ops = &terratec_ops,
154 	.has_stereo = true,
155 	.max_volume = 10,
156 };
157 
158 static int __init terratec_init(void)
159 {
160 	return isa_register_driver(&terratec_driver.driver, 1);
161 }
162 
163 static void __exit terratec_exit(void)
164 {
165 	isa_unregister_driver(&terratec_driver.driver);
166 }
167 
168 module_init(terratec_init);
169 module_exit(terratec_exit);
170 
171