169 lines
4.4 KiB
C
169 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
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* (c) 1999 R. Offermanns (rolf@offermanns.de)
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* based on the aimslab radio driver from M. Kirkwood
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* many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
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*
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*
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* History:
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* 1999-05-21 First preview release
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*
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* Notes on the hardware:
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* There are two "main" chips on the card:
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* - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
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* - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
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* (you can get the datasheet at the above links)
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*
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* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
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* Volume Control is done digitally
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*
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* Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
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* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
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*/
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#include <linux/module.h> /* Modules */
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#include <linux/init.h> /* Initdata */
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#include <linux/ioport.h> /* request_region */
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#include <linux/videodev2.h> /* kernel radio structs */
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#include <linux/mutex.h>
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#include <linux/io.h> /* outb, outb_p */
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#include <linux/slab.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include "radio-isa.h"
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MODULE_AUTHOR("R. Offermans & others");
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MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("0.1.99");
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/* Note: there seems to be only one possible port (0x590), but without
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hardware this is hard to verify. For now, this is the only one we will
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support. */
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static int io = 0x590;
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static int radio_nr = -1;
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module_param(radio_nr, int, 0444);
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MODULE_PARM_DESC(radio_nr, "Radio device number");
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#define WRT_DIS 0x00
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#define CLK_OFF 0x00
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#define IIC_DATA 0x01
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#define IIC_CLK 0x02
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#define DATA 0x04
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#define CLK_ON 0x08
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#define WRT_EN 0x10
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static struct radio_isa_card *terratec_alloc(void)
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{
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return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
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}
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static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
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{
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int i;
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if (mute)
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vol = 0;
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vol = vol + (vol * 32); /* change both channels */
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for (i = 0; i < 8; i++) {
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if (vol & (0x80 >> i))
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outb(0x80, isa->io + 1);
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else
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outb(0x00, isa->io + 1);
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}
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return 0;
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}
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/* this is the worst part in this driver */
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/* many more or less strange things are going on here, but hey, it works :) */
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static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
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{
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int i;
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int temp;
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long rest;
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unsigned char buffer[25]; /* we have to bit shift 25 registers */
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freq = freq / 160; /* convert the freq. to a nice to handle value */
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memset(buffer, 0, sizeof(buffer));
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rest = freq * 10 + 10700; /* I once had understood what is going on here */
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/* maybe some wise guy (friedhelm?) can comment this stuff */
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i = 13;
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temp = 102400;
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while (rest != 0) {
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if (rest % temp == rest)
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buffer[i] = 0;
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else {
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buffer[i] = 1;
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rest = rest - temp;
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}
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i--;
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temp = temp / 2;
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}
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for (i = 24; i > -1; i--) { /* bit shift the values to the radiocard */
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if (buffer[i] == 1) {
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outb(WRT_EN | DATA, isa->io);
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outb(WRT_EN | DATA | CLK_ON, isa->io);
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outb(WRT_EN | DATA, isa->io);
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} else {
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outb(WRT_EN | 0x00, isa->io);
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outb(WRT_EN | 0x00 | CLK_ON, isa->io);
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}
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}
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outb(0x00, isa->io);
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return 0;
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}
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static u32 terratec_g_signal(struct radio_isa_card *isa)
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{
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/* bit set = no signal present */
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return (inb(isa->io) & 2) ? 0 : 0xffff;
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}
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static const struct radio_isa_ops terratec_ops = {
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.alloc = terratec_alloc,
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.s_mute_volume = terratec_s_mute_volume,
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.s_frequency = terratec_s_frequency,
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.g_signal = terratec_g_signal,
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};
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static const int terratec_ioports[] = { 0x590 };
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static struct radio_isa_driver terratec_driver = {
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.driver = {
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.match = radio_isa_match,
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.probe = radio_isa_probe,
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.remove = radio_isa_remove,
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.driver = {
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.name = "radio-terratec",
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},
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},
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.io_params = &io,
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.radio_nr_params = &radio_nr,
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.io_ports = terratec_ioports,
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.num_of_io_ports = ARRAY_SIZE(terratec_ioports),
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.region_size = 2,
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.card = "TerraTec ActiveRadio",
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.ops = &terratec_ops,
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.has_stereo = true,
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.max_volume = 10,
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};
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static int __init terratec_init(void)
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{
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return isa_register_driver(&terratec_driver.driver, 1);
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}
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static void __exit terratec_exit(void)
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{
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isa_unregister_driver(&terratec_driver.driver);
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}
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module_init(terratec_init);
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module_exit(terratec_exit);
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