Commit | Line | Data |
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1da177e4 LT |
1 | /* Typhoon Radio Card driver for radio support |
2 | * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de> | |
3 | * | |
1da177e4 LT |
4 | * Notes on the hardware |
5 | * | |
6 | * This card has two output sockets, one for speakers and one for line. | |
7 | * The speaker output has volume control, but only in four discrete | |
8 | * steps. The line output has neither volume control nor mute. | |
9 | * | |
10 | * The card has auto-stereo according to its manual, although it all | |
11 | * sounds mono to me (even with the Win/DOS drivers). Maybe it's my | |
12 | * antenna - I really don't know for sure. | |
13 | * | |
14 | * Frequency control is done digitally. | |
15 | * | |
16 | * Volume control is done digitally, but there are only four different | |
17 | * possible values. So you should better always turn the volume up and | |
18 | * use line control. I got the best results by connecting line output | |
19 | * to the sound card microphone input. For such a configuration the | |
20 | * volume control has no effect, since volume control only influences | |
21 | * the speaker output. | |
22 | * | |
23 | * There is no explicit mute/unmute. So I set the radio frequency to a | |
24 | * value where I do expect just noise and turn the speaker volume down. | |
25 | * The frequency change is necessary since the card never seems to be | |
26 | * completely silent. | |
30c48305 MCC |
27 | * |
28 | * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> | |
1da177e4 LT |
29 | */ |
30 | ||
31 | #include <linux/module.h> /* Modules */ | |
32 | #include <linux/init.h> /* Initdata */ | |
fb911ee8 | 33 | #include <linux/ioport.h> /* request_region */ |
30c48305 | 34 | #include <linux/videodev2.h> /* kernel radio structs */ |
f1bfe89b | 35 | #include <linux/io.h> /* outb, outb_p */ |
9f1dfccf | 36 | #include <linux/slab.h> |
f1bfe89b | 37 | #include <media/v4l2-device.h> |
35ea11ff | 38 | #include <media/v4l2-ioctl.h> |
da1ff351 | 39 | #include "radio-isa.h" |
1da177e4 | 40 | |
29834c1a MCC |
41 | #define DRIVER_VERSION "0.1.2" |
42 | ||
f1bfe89b HV |
43 | MODULE_AUTHOR("Dr. Henrik Seidel"); |
44 | MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); | |
45 | MODULE_LICENSE("GPL"); | |
da1ff351 | 46 | MODULE_VERSION("0.1.99"); |
1da177e4 LT |
47 | |
48 | #ifndef CONFIG_RADIO_TYPHOON_PORT | |
49 | #define CONFIG_RADIO_TYPHOON_PORT -1 | |
50 | #endif | |
51 | ||
52 | #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ | |
da1ff351 | 53 | #define CONFIG_RADIO_TYPHOON_MUTEFREQ 87000 |
1da177e4 LT |
54 | #endif |
55 | ||
da1ff351 | 56 | #define TYPHOON_MAX 2 |
f1bfe89b | 57 | |
da1ff351 HV |
58 | static int io[TYPHOON_MAX] = { [0] = CONFIG_RADIO_TYPHOON_PORT, |
59 | [1 ... (TYPHOON_MAX - 1)] = -1 }; | |
60 | static int radio_nr[TYPHOON_MAX] = { [0 ... (TYPHOON_MAX - 1)] = -1 }; | |
f1bfe89b | 61 | static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ; |
da1ff351 HV |
62 | |
63 | module_param_array(io, int, NULL, 0444); | |
64 | MODULE_PARM_DESC(io, "I/O addresses of the Typhoon card (0x316 or 0x336)"); | |
65 | module_param_array(radio_nr, int, NULL, 0444); | |
66 | MODULE_PARM_DESC(radio_nr, "Radio device numbers"); | |
f1bfe89b HV |
67 | module_param(mutefreq, ulong, 0); |
68 | MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); | |
69 | ||
f1bfe89b | 70 | struct typhoon { |
da1ff351 | 71 | struct radio_isa_card isa; |
1da177e4 | 72 | int muted; |
1da177e4 LT |
73 | }; |
74 | ||
da1ff351 | 75 | static struct radio_isa_card *typhoon_alloc(void) |
1da177e4 | 76 | { |
da1ff351 HV |
77 | struct typhoon *ty = kzalloc(sizeof(*ty), GFP_KERNEL); |
78 | ||
79 | return ty ? &ty->isa : NULL; | |
1da177e4 LT |
80 | } |
81 | ||
da1ff351 | 82 | static int typhoon_s_frequency(struct radio_isa_card *isa, u32 freq) |
1da177e4 LT |
83 | { |
84 | unsigned long outval; | |
85 | unsigned long x; | |
86 | ||
87 | /* | |
88 | * The frequency transfer curve is not linear. The best fit I could | |
89 | * get is | |
90 | * | |
91 | * outval = -155 + exp((f + 15.55) * 0.057)) | |
92 | * | |
93 | * where frequency f is in MHz. Since we don't have exp in the kernel, | |
94 | * I approximate this function by a third order polynomial. | |
95 | * | |
96 | */ | |
97 | ||
da1ff351 | 98 | x = freq / 160; |
1da177e4 LT |
99 | outval = (x * x + 2500) / 5000; |
100 | outval = (outval * x + 5000) / 10000; | |
101 | outval -= (10 * x * x + 10433) / 20866; | |
102 | outval += 4 * x - 11505; | |
103 | ||
da1ff351 HV |
104 | outb_p((outval >> 8) & 0x01, isa->io + 4); |
105 | outb_p(outval >> 9, isa->io + 6); | |
106 | outb_p(outval & 0xff, isa->io + 8); | |
3f6892ac DL |
107 | return 0; |
108 | } | |
30c48305 | 109 | |
da1ff351 | 110 | static int typhoon_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) |
3f6892ac | 111 | { |
da1ff351 | 112 | struct typhoon *ty = container_of(isa, struct typhoon, isa); |
30c48305 | 113 | |
da1ff351 HV |
114 | if (mute) |
115 | vol = 0; | |
116 | vol >>= 14; /* Map 16 bit to 2 bit */ | |
117 | vol &= 3; | |
118 | outb_p(vol / 2, isa->io); /* Set the volume, high bit. */ | |
119 | outb_p(vol % 2, isa->io + 2); /* Set the volume, low bit. */ | |
30c48305 | 120 | |
da1ff351 HV |
121 | if (vol == 0 && !ty->muted) { |
122 | ty->muted = true; | |
123 | return typhoon_s_frequency(isa, mutefreq << 4); | |
3f6892ac | 124 | } |
da1ff351 HV |
125 | if (vol && ty->muted) { |
126 | ty->muted = false; | |
127 | return typhoon_s_frequency(isa, isa->freq); | |
3f6892ac | 128 | } |
3f6892ac | 129 | return 0; |
1da177e4 LT |
130 | } |
131 | ||
da1ff351 HV |
132 | static const struct radio_isa_ops typhoon_ops = { |
133 | .alloc = typhoon_alloc, | |
134 | .s_mute_volume = typhoon_s_mute_volume, | |
135 | .s_frequency = typhoon_s_frequency, | |
1da177e4 LT |
136 | }; |
137 | ||
da1ff351 HV |
138 | static const int typhoon_ioports[] = { 0x316, 0x336 }; |
139 | ||
140 | static struct radio_isa_driver typhoon_driver = { | |
141 | .driver = { | |
142 | .match = radio_isa_match, | |
143 | .probe = radio_isa_probe, | |
144 | .remove = radio_isa_remove, | |
145 | .driver = { | |
146 | .name = "radio-typhoon", | |
147 | }, | |
148 | }, | |
149 | .io_params = io, | |
150 | .radio_nr_params = radio_nr, | |
151 | .io_ports = typhoon_ioports, | |
152 | .num_of_io_ports = ARRAY_SIZE(typhoon_ioports), | |
153 | .region_size = 8, | |
154 | .card = "Typhoon Radio", | |
155 | .ops = &typhoon_ops, | |
156 | .has_stereo = true, | |
157 | .max_volume = 3, | |
1da177e4 LT |
158 | }; |
159 | ||
f1bfe89b | 160 | static int __init typhoon_init(void) |
0b9c2b7a | 161 | { |
da1ff351 HV |
162 | if (mutefreq < 87000 || mutefreq > 108000) { |
163 | printk(KERN_ERR "%s: You must set a frequency (in kHz) used when muting the card,\n", | |
164 | typhoon_driver.driver.driver.name); | |
165 | printk(KERN_ERR "%s: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108000)\n", | |
166 | typhoon_driver.driver.driver.name); | |
167 | return -ENODEV; | |
f1bfe89b | 168 | } |
da1ff351 | 169 | return isa_register_driver(&typhoon_driver.driver, TYPHOON_MAX); |
1da177e4 LT |
170 | } |
171 | ||
f1bfe89b | 172 | static void __exit typhoon_exit(void) |
1da177e4 | 173 | { |
da1ff351 | 174 | isa_unregister_driver(&typhoon_driver.driver); |
1da177e4 LT |
175 | } |
176 | ||
da1ff351 | 177 | |
1da177e4 | 178 | module_init(typhoon_init); |
f1bfe89b | 179 | module_exit(typhoon_exit); |
1da177e4 | 180 |