1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Terratec ActiveRadio ISA Standalone card driver for Linux radio support 3 * (c) 1999 R. Offermanns (rolf@offermanns.de) 4 * based on the aimslab radio driver from M. Kirkwood 5 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec) 6 * 7 * 8 * History: 9 * 1999-05-21 First preview release 10 * 11 * Notes on the hardware: 12 * There are two "main" chips on the card: 13 * - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf) 14 * - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf) 15 * (you can get the datasheet at the above links) 16 * 17 * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); 18 * Volume Control is done digitally 19 * 20 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com> 21 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org> 22 */ 23 24 #include <linux/module.h> /* Modules */ 25 #include <linux/init.h> /* Initdata */ 26 #include <linux/ioport.h> /* request_region */ 27 #include <linux/videodev2.h> /* kernel radio structs */ 28 #include <linux/mutex.h> 29 #include <linux/io.h> /* outb, outb_p */ 30 #include <linux/slab.h> 31 #include <media/v4l2-device.h> 32 #include <media/v4l2-ioctl.h> 33 #include "radio-isa.h" 34 35 MODULE_AUTHOR("R. Offermans & others"); 36 MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card."); 37 MODULE_LICENSE("GPL"); 38 MODULE_VERSION("0.1.99"); 39 40 /* Note: there seems to be only one possible port (0x590), but without 41 hardware this is hard to verify. For now, this is the only one we will 42 support. */ 43 static int io = 0x590; 44 static int radio_nr = -1; 45 46 module_param(radio_nr, int, 0444); 47 MODULE_PARM_DESC(radio_nr, "Radio device number"); 48 49 #define WRT_DIS 0x00 50 #define CLK_OFF 0x00 51 #define IIC_DATA 0x01 52 #define IIC_CLK 0x02 53 #define DATA 0x04 54 #define CLK_ON 0x08 55 #define WRT_EN 0x10 56 57 static struct radio_isa_card *terratec_alloc(void) 58 { 59 return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL); 60 } 61 62 static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) 63 { 64 int i; 65 66 if (mute) 67 vol = 0; 68 vol = vol + (vol * 32); /* change both channels */ 69 for (i = 0; i < 8; i++) { 70 if (vol & (0x80 >> i)) 71 outb(0x80, isa->io + 1); 72 else 73 outb(0x00, isa->io + 1); 74 } 75 return 0; 76 } 77 78 79 /* this is the worst part in this driver */ 80 /* many more or less strange things are going on here, but hey, it works :) */ 81 82 static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq) 83 { 84 int i; 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 temp = 102400; 96 while (rest != 0) { 97 if (rest % temp == rest) 98 buffer[i] = 0; 99 else { 100 buffer[i] = 1; 101 rest = rest - temp; 102 } 103 i--; 104 temp = temp / 2; 105 } 106 107 for (i = 24; i > -1; i--) { /* bit shift the values to the radiocard */ 108 if (buffer[i] == 1) { 109 outb(WRT_EN | DATA, isa->io); 110 outb(WRT_EN | DATA | CLK_ON, isa->io); 111 outb(WRT_EN | DATA, isa->io); 112 } else { 113 outb(WRT_EN | 0x00, isa->io); 114 outb(WRT_EN | 0x00 | CLK_ON, isa->io); 115 } 116 } 117 outb(0x00, isa->io); 118 return 0; 119 } 120 121 static u32 terratec_g_signal(struct radio_isa_card *isa) 122 { 123 /* bit set = no signal present */ 124 return (inb(isa->io) & 2) ? 0 : 0xffff; 125 } 126 127 static const struct radio_isa_ops terratec_ops = { 128 .alloc = terratec_alloc, 129 .s_mute_volume = terratec_s_mute_volume, 130 .s_frequency = terratec_s_frequency, 131 .g_signal = terratec_g_signal, 132 }; 133 134 static const int terratec_ioports[] = { 0x590 }; 135 136 static struct radio_isa_driver terratec_driver = { 137 .driver = { 138 .match = radio_isa_match, 139 .probe = radio_isa_probe, 140 .remove = radio_isa_remove, 141 .driver = { 142 .name = "radio-terratec", 143 }, 144 }, 145 .io_params = &io, 146 .radio_nr_params = &radio_nr, 147 .io_ports = terratec_ioports, 148 .num_of_io_ports = ARRAY_SIZE(terratec_ioports), 149 .region_size = 2, 150 .card = "TerraTec ActiveRadio", 151 .ops = &terratec_ops, 152 .has_stereo = true, 153 .max_volume = 10, 154 }; 155 156 static int __init terratec_init(void) 157 { 158 return isa_register_driver(&terratec_driver.driver, 1); 159 } 160 161 static void __exit terratec_exit(void) 162 { 163 isa_unregister_driver(&terratec_driver.driver); 164 } 165 166 module_init(terratec_init); 167 module_exit(terratec_exit); 168 169