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@kernel.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