![Mauro Carvalho Chehab](/assets/img/avatar_default.png)
From now on, I'll start using my @kernel.org as my development e-mail. As such, let's remove the entries that point to the old mchehab@s-opensource.com at MAINTAINERS file. For the files written with a copyright with mchehab@s-opensource, let's keep Samsung on their names, using mchehab+samsung@kernel.org, in order to keep pointing to my employer, with sponsors the work. For the files written before I join Samsung (on July, 4 2013), let's just use mchehab@kernel.org. For bug reports, we can simply point to just kernel.org, as this will reach my mchehab+samsung inbox anyway. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Brian Warner <brian.warner@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
181 lines
5.2 KiB
C
181 lines
5.2 KiB
C
/* Typhoon Radio Card driver for radio support
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* (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
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*
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* Notes on the hardware
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*
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* This card has two output sockets, one for speakers and one for line.
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* The speaker output has volume control, but only in four discrete
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* steps. The line output has neither volume control nor mute.
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*
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* The card has auto-stereo according to its manual, although it all
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* sounds mono to me (even with the Win/DOS drivers). Maybe it's my
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* antenna - I really don't know for sure.
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*
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* Frequency control is done digitally.
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*
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* Volume control is done digitally, but there are only four different
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* possible values. So you should better always turn the volume up and
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* use line control. I got the best results by connecting line output
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* to the sound card microphone input. For such a configuration the
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* volume control has no effect, since volume control only influences
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* the speaker output.
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*
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* There is no explicit mute/unmute. So I set the radio frequency to a
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* value where I do expect just noise and turn the speaker volume down.
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* The frequency change is necessary since the card never seems to be
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* completely silent.
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*
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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/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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#define DRIVER_VERSION "0.1.2"
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MODULE_AUTHOR("Dr. Henrik Seidel");
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MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("0.1.99");
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#ifndef CONFIG_RADIO_TYPHOON_PORT
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#define CONFIG_RADIO_TYPHOON_PORT -1
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#endif
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#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
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#define CONFIG_RADIO_TYPHOON_MUTEFREQ 87000
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#endif
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#define TYPHOON_MAX 2
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static int io[TYPHOON_MAX] = { [0] = CONFIG_RADIO_TYPHOON_PORT,
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[1 ... (TYPHOON_MAX - 1)] = -1 };
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static int radio_nr[TYPHOON_MAX] = { [0 ... (TYPHOON_MAX - 1)] = -1 };
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static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ;
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module_param_array(io, int, NULL, 0444);
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MODULE_PARM_DESC(io, "I/O addresses of the Typhoon card (0x316 or 0x336)");
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module_param_array(radio_nr, int, NULL, 0444);
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MODULE_PARM_DESC(radio_nr, "Radio device numbers");
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module_param(mutefreq, ulong, 0);
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MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
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struct typhoon {
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struct radio_isa_card isa;
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int muted;
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};
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static struct radio_isa_card *typhoon_alloc(void)
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{
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struct typhoon *ty = kzalloc(sizeof(*ty), GFP_KERNEL);
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return ty ? &ty->isa : NULL;
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}
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static int typhoon_s_frequency(struct radio_isa_card *isa, u32 freq)
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{
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unsigned long outval;
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unsigned long x;
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/*
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* The frequency transfer curve is not linear. The best fit I could
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* get is
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*
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* outval = -155 + exp((f + 15.55) * 0.057))
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*
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* where frequency f is in MHz. Since we don't have exp in the kernel,
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* I approximate this function by a third order polynomial.
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*
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*/
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x = freq / 160;
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outval = (x * x + 2500) / 5000;
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outval = (outval * x + 5000) / 10000;
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outval -= (10 * x * x + 10433) / 20866;
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outval += 4 * x - 11505;
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outb_p((outval >> 8) & 0x01, isa->io + 4);
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outb_p(outval >> 9, isa->io + 6);
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outb_p(outval & 0xff, isa->io + 8);
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return 0;
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}
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static int typhoon_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
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{
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struct typhoon *ty = container_of(isa, struct typhoon, isa);
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if (mute)
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vol = 0;
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vol >>= 14; /* Map 16 bit to 2 bit */
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vol &= 3;
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outb_p(vol / 2, isa->io); /* Set the volume, high bit. */
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outb_p(vol % 2, isa->io + 2); /* Set the volume, low bit. */
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if (vol == 0 && !ty->muted) {
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ty->muted = true;
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return typhoon_s_frequency(isa, mutefreq << 4);
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}
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if (vol && ty->muted) {
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ty->muted = false;
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return typhoon_s_frequency(isa, isa->freq);
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}
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return 0;
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}
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static const struct radio_isa_ops typhoon_ops = {
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.alloc = typhoon_alloc,
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.s_mute_volume = typhoon_s_mute_volume,
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.s_frequency = typhoon_s_frequency,
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};
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static const int typhoon_ioports[] = { 0x316, 0x336 };
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static struct radio_isa_driver typhoon_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-typhoon",
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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 = typhoon_ioports,
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.num_of_io_ports = ARRAY_SIZE(typhoon_ioports),
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.region_size = 8,
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.card = "Typhoon Radio",
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.ops = &typhoon_ops,
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.has_stereo = true,
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.max_volume = 3,
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};
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static int __init typhoon_init(void)
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{
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if (mutefreq < 87000 || mutefreq > 108000) {
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printk(KERN_ERR "%s: You must set a frequency (in kHz) used when muting the card,\n",
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typhoon_driver.driver.driver.name);
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printk(KERN_ERR "%s: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108000)\n",
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typhoon_driver.driver.driver.name);
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return -ENODEV;
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}
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return isa_register_driver(&typhoon_driver.driver, TYPHOON_MAX);
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}
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static void __exit typhoon_exit(void)
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{
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isa_unregister_driver(&typhoon_driver.driver);
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}
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module_init(typhoon_init);
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module_exit(typhoon_exit);
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