cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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radio-terratec.c (4507B)

      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
     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 without
     41   hardware this is hard to verify. For now, this is the only one we will
     42   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		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
     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		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
     82static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
     83{
     84	int i;
     85	int p;
     86	int temp;
     87	long rest;
     88	unsigned char buffer[25];		/* we have to bit shift 25 registers */
     89
     90	freq = freq / 160;			/* convert the freq. to a nice to handle value */
     91	memset(buffer, 0, sizeof(buffer));
     92
     93	rest = freq * 10 + 10700;	/* I once had understood what is going on here */
     94					/* maybe some wise guy (friedhelm?) can comment this stuff */
     95	i = 13;
     96	p = 10;
     97	temp = 102400;
     98	while (rest != 0) {
     99		if (rest % temp  == rest)
    100			buffer[i] = 0;
    101		else {
    102			buffer[i] = 1;
    103			rest = rest - temp;
    104		}
    105		i--;
    106		p--;
    107		temp = temp / 2;
    108	}
    109
    110	for (i = 24; i > -1; i--) {	/* bit shift the values to the radiocard */
    111		if (buffer[i] == 1) {
    112			outb(WRT_EN | DATA, isa->io);
    113			outb(WRT_EN | DATA | CLK_ON, isa->io);
    114			outb(WRT_EN | DATA, isa->io);
    115		} else {
    116			outb(WRT_EN | 0x00, isa->io);
    117			outb(WRT_EN | 0x00 | CLK_ON, isa->io);
    118		}
    119	}
    120	outb(0x00, isa->io);
    121	return 0;
    122}
    123
    124static u32 terratec_g_signal(struct radio_isa_card *isa)
    125{
    126	/* bit set = no signal present	*/
    127	return (inb(isa->io) & 2) ? 0 : 0xffff;
    128}
    129
    130static const struct radio_isa_ops terratec_ops = {
    131	.alloc = terratec_alloc,
    132	.s_mute_volume = terratec_s_mute_volume,
    133	.s_frequency = terratec_s_frequency,
    134	.g_signal = terratec_g_signal,
    135};
    136
    137static const int terratec_ioports[] = { 0x590 };
    138
    139static struct radio_isa_driver terratec_driver = {
    140	.driver = {
    141		.match		= radio_isa_match,
    142		.probe		= radio_isa_probe,
    143		.remove		= radio_isa_remove,
    144		.driver		= {
    145			.name	= "radio-terratec",
    146		},
    147	},
    148	.io_params = &io,
    149	.radio_nr_params = &radio_nr,
    150	.io_ports = terratec_ioports,
    151	.num_of_io_ports = ARRAY_SIZE(terratec_ioports),
    152	.region_size = 2,
    153	.card = "TerraTec ActiveRadio",
    154	.ops = &terratec_ops,
    155	.has_stereo = true,
    156	.max_volume = 10,
    157};
    158
    159static int __init terratec_init(void)
    160{
    161	return isa_register_driver(&terratec_driver.driver, 1);
    162}
    163
    164static void __exit terratec_exit(void)
    165{
    166	isa_unregister_driver(&terratec_driver.driver);
    167}
    168
    169module_init(terratec_init);
    170module_exit(terratec_exit);
    171