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1// SPDX-License-Identifier: GPL-2.0-only2/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support3 * (c) 1999 R. Offermanns (rolf@offermanns.de)4 * based on the aimslab radio driver from M. Kirkwood5 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)6 *7 *8 * History:9 * 1999-05-21 First preview release10 *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 digitally19 *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 35MODULE_AUTHOR("R. Offermans & others");36MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");37MODULE_LICENSE("GPL");38MODULE_VERSION("0.1.99");39 40/* Note: there seems to be only one possible port (0x590), but without41 hardware this is hard to verify. For now, this is the only one we will42 support. */43static int io = 0x590;44static int radio_nr = -1;45 46module_param(radio_nr, int, 0444);47MODULE_PARM_DESC(radio_nr, "Radio device number");48 49#define WRT_DIS 0x0050#define CLK_OFF 0x0051#define IIC_DATA 0x0152#define IIC_CLK 0x0253#define DATA 0x0454#define CLK_ON 0x0855#define WRT_EN 0x1056 57static struct radio_isa_card *terratec_alloc(void)58{59 return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);60}61 62static 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 else73 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 82static 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 121static 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 127static 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 134static const int terratec_ioports[] = { 0x590 };135 136static 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 156static int __init terratec_init(void)157{158 return isa_register_driver(&terratec_driver.driver, 1);159}160 161static void __exit terratec_exit(void)162{163 isa_unregister_driver(&terratec_driver.driver);164}165 166module_init(terratec_init);167module_exit(terratec_exit);168 169