1 /* Typhoon Radio Card driver for radio support 2 * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de> 3 * 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. 27 * 28 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> 29 */ 30 31 #include <linux/module.h> /* Modules */ 32 #include <linux/init.h> /* Initdata */ 33 #include <linux/ioport.h> /* request_region */ 34 #include <linux/videodev2.h> /* kernel radio structs */ 35 #include <linux/io.h> /* outb, outb_p */ 36 #include <linux/slab.h> 37 #include <media/v4l2-device.h> 38 #include <media/v4l2-ioctl.h> 39 #include "radio-isa.h" 40 41 #define DRIVER_VERSION "0.1.2" 42 43 MODULE_AUTHOR("Dr. Henrik Seidel"); 44 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); 45 MODULE_LICENSE("GPL"); 46 MODULE_VERSION("0.1.99"); 47 48 #ifndef CONFIG_RADIO_TYPHOON_PORT 49 #define CONFIG_RADIO_TYPHOON_PORT -1 50 #endif 51 52 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ 53 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 87000 54 #endif 55 56 #define TYPHOON_MAX 2 57 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 }; 61 static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ; 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"); 67 module_param(mutefreq, ulong, 0); 68 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); 69 70 struct typhoon { 71 struct radio_isa_card isa; 72 int muted; 73 }; 74 75 static struct radio_isa_card *typhoon_alloc(void) 76 { 77 struct typhoon *ty = kzalloc(sizeof(*ty), GFP_KERNEL); 78 79 return ty ? &ty->isa : NULL; 80 } 81 82 static int typhoon_s_frequency(struct radio_isa_card *isa, u32 freq) 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 98 x = freq / 160; 99 outval = (x * x + 2500) / 5000; 100 outval = (outval * x + 5000) / 10000; 101 outval -= (10 * x * x + 10433) / 20866; 102 outval += 4 * x - 11505; 103 104 outb_p((outval >> 8) & 0x01, isa->io + 4); 105 outb_p(outval >> 9, isa->io + 6); 106 outb_p(outval & 0xff, isa->io + 8); 107 return 0; 108 } 109 110 static int typhoon_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) 111 { 112 struct typhoon *ty = container_of(isa, struct typhoon, isa); 113 114 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. */ 120 121 if (vol == 0 && !ty->muted) { 122 ty->muted = true; 123 return typhoon_s_frequency(isa, mutefreq << 4); 124 } 125 if (vol && ty->muted) { 126 ty->muted = false; 127 return typhoon_s_frequency(isa, isa->freq); 128 } 129 return 0; 130 } 131 132 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, 136 }; 137 138 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, 158 }; 159 160 static int __init typhoon_init(void) 161 { 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; 168 } 169 return isa_register_driver(&typhoon_driver.driver, TYPHOON_MAX); 170 } 171 172 static void __exit typhoon_exit(void) 173 { 174 isa_unregister_driver(&typhoon_driver.driver); 175 } 176 177 178 module_init(typhoon_init); 179 module_exit(typhoon_exit); 180 181