// SPDX-License-Identifier: GPL-2.0-only
/*
* GemTek radio card driver
*
* Copyright 1998 Jonas Munsin <[email protected]>
*
* GemTek hasn't released any specs on the card, so the protocol had to
* be reverse engineered with dosemu.
*
* Besides the protocol changes, this is mostly a copy of:
*
* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
*
* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
* Converted to new API by Alan Cox <[email protected]>
* Various bugfixes and enhancements by Russell Kroll <[email protected]>
*
* Converted to the radio-isa framework by Hans Verkuil <[email protected]>
* Converted to V4L2 API by Mauro Carvalho Chehab <[email protected]>
*
* Note: this card seems to swap the left and right audio channels!
*
* Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool.
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* request_region */
#include <linux/delay.h> /* udelay */
#include <linux/videodev2.h> /* kernel radio structs */
#include <linux/mutex.h>
#include <linux/io.h> /* outb, outb_p */
#include <linux/pnp.h>
#include <linux/slab.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>
#include "radio-isa.h"
/*
* Module info.
*/
MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <[email protected]>");
MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.0.0");
/*
* Module params.
*/
#ifndef CONFIG_RADIO_GEMTEK_PORT
#define CONFIG_RADIO_GEMTEK_PORT -1
#endif
#ifndef CONFIG_RADIO_GEMTEK_PROBE
#define CONFIG_RADIO_GEMTEK_PROBE 1
#endif
#define GEMTEK_MAX 4
static bool probe = CONFIG_RADIO_GEMTEK_PROBE;
static bool hardmute;
static int io[GEMTEK_MAX] = { [0] = CONFIG_RADIO_GEMTEK_PORT,
[1 ... (GEMTEK_MAX - 1)] = -1 };
static int radio_nr[GEMTEK_MAX] = { [0 ... (GEMTEK_MAX - 1)] = -1 };
module_param(probe, bool, 0444);
MODULE_PARM_DESC(probe, "Enable automatic device probing.");
module_param(hardmute, bool, 0644);
MODULE_PARM_DESC(hardmute, "Enable 'hard muting' by shutting down PLL, may reduce static noise.");
module_param_array(io, int, NULL, 0444);
MODULE_PARM_DESC(io, "Force I/O ports for the GemTek Radio card if automatic probing is disabled or fails. The most common I/O ports are: 0x20c 0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to work for the combined sound/radiocard).");
module_param_array(radio_nr, int, NULL, 0444);
MODULE_PARM_DESC(radio_nr, "Radio device numbers");
/*
* Frequency calculation constants. Intermediate frequency 10.52 MHz (nominal
* value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
*/
#define FSCALE 8
#define IF_OFFSET ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
#define REF_FREQ ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
#define GEMTEK_CK 0x01 /* Clock signal */
#define GEMTEK_DA 0x02 /* Serial data */
#define GEMTEK_CE 0x04 /* Chip enable */
#define GEMTEK_NS 0x08 /* No signal */
#define GEMTEK_MT 0x10 /* Line mute */
#define GEMTEK_STDF_3_125_KHZ 0x01 /* Standard frequency 3.125 kHz */
#define GEMTEK_PLL_OFF 0x07 /* PLL off */
#define BU2614_BUS_SIZE 32 /* BU2614 / BU2614FS bus size */
#define SHORT_DELAY 5 /* usec */
#define LONG_DELAY 75 /* usec */
struct gemtek {
struct radio_isa_card isa;
bool muted;
u32 bu2614data;
};
#define BU2614_FREQ_BITS 16 /* D0..D15, Frequency data */
#define BU2614_PORT_BITS 3 /* P0..P2, Output port control data */
#define BU2614_VOID_BITS 4 /* unused */
#define BU2614_FMES_BITS 1 /* CT, Frequency measurement beginning data */
#define BU2614_STDF_BITS 3 /* R0..R2, Standard frequency data */
#define BU2614_SWIN_BITS 1 /* S, Switch between FMIN / AMIN */
#define BU2614_SWAL_BITS 1 /* PS, Swallow counter division (AMIN only)*/
#define BU2614_VOID2_BITS 1 /* unused */
#define BU2614_FMUN_BITS 1 /* GT, Frequency measurement time & unlock */
#define BU2614_TEST_BITS 1 /* TS, Test data is input */
#define BU2614_FREQ_SHIFT 0
#define BU2614_PORT_SHIFT (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
#define BU2614_VOID_SHIFT (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
#define BU2614_FMES_SHIFT (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
#define BU2614_STDF_SHIFT (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
#define BU2614_SWIN_SHIFT (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
#define BU2614_SWAL_SHIFT (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
#define BU2614_VOID2_SHIFT (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
#define BU2614_FMUN_SHIFT (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
#define BU2614_TEST_SHIFT (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
#define MKMASK(field) (((1UL<<BU2614_##field##_BITS) - 1) << \
BU2614_##field##_SHIFT)
#define BU2614_PORT_MASK MKMASK(PORT)
#define BU2614_FREQ_MASK MKMASK(FREQ)
#define BU2614_VOID_MASK MKMASK(VOID)
#define BU2614_FMES_MASK MKMASK(FMES)
#define BU2614_STDF_MASK MKMASK(STDF)
#define BU2614_SWIN_MASK MKMASK(SWIN)
#define BU2614_SWAL_MASK MKMASK(SWAL)
#define BU2614_VOID2_MASK MKMASK(VOID2)
#define BU2614_FMUN_MASK MKMASK(FMUN)
#define BU2614_TEST_MASK MKMASK(TEST)
/*
* Set data which will be sent to BU2614FS.
*/
#define gemtek_bu2614_set(dev, field, data) ((dev)->bu2614data = \
((dev)->bu2614data & ~field##_MASK) | ((data) << field##_SHIFT))
/*
* Transmit settings to BU2614FS over GemTek IC.
*/
static void gemtek_bu2614_transmit(struct gemtek *gt)
{
struct radio_isa_card *isa = >->isa;
int i, bit, q, mute;
mute = gt->muted ? GEMTEK_MT : 0x00;
outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, isa->io);
udelay(LONG_DELAY);
for (i = 0, q = gt->bu2614data; i < 32; i++, q >>= 1) {
bit = (q & 1) ? GEMTEK_DA : 0;
outb_p(mute | GEMTEK_CE | bit, isa->io);
udelay(SHORT_DELAY);
outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, isa->io);
udelay(SHORT_DELAY);
}
outb_p(mute | GEMTEK_DA | GEMTEK_CK, isa->io);
udelay(SHORT_DELAY);
}
/*
* Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
*/
static unsigned long gemtek_convfreq(unsigned long freq)
{
return ((freq << FSCALE) + IF_OFFSET + REF_FREQ / 2) / REF_FREQ;
}
static struct radio_isa_card *gemtek_alloc(void)
{
struct gemtek *gt = kzalloc(sizeof(*gt), GFP_KERNEL);
if (gt)
gt->muted = true;
return gt ? >->isa : NULL;
}
/*
* Set FM-frequency.
*/
static int gemtek_s_frequency(struct radio_isa_card *isa, u32 freq)
{
struct gemtek *gt = container_of(isa, struct gemtek, isa);
if (hardmute && gt->muted)
return 0;
gemtek_bu2614_set(gt, BU2614_PORT, 0);
gemtek_bu2614_set(gt, BU2614_FMES, 0);
gemtek_bu2614_set(gt, BU2614_SWIN, 0); /* FM-mode */
gemtek_bu2614_set(gt, BU2614_SWAL, 0);
gemtek_bu2614_set(gt, BU2614_FMUN, 1); /* GT bit set */
gemtek_bu2614_set(gt, BU2614_TEST, 0);
gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
gemtek_bu2614_set(gt, BU2614_FREQ, gemtek_convfreq(freq));
gemtek_bu2614_transmit(gt);
return 0;
}
/*
* Set mute flag.
*/
static int gemtek_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
{
struct gemtek *gt = container_of(isa, struct gemtek, isa);
int i;
gt->muted = mute;
if (hardmute) {
if (!mute)
return gemtek_s_frequency(isa, isa->freq);
/* Turn off PLL, disable data output */
gemtek_bu2614_set(gt, BU2614_PORT, 0);
gemtek_bu2614_set(gt, BU2614_FMES, 0); /* CT bit off */
gemtek_bu2614_set(gt, BU2614_SWIN, 0); /* FM-mode */
gemtek_bu2614_set(gt, BU2614_SWAL, 0);
gemtek_bu2614_set(gt, BU2614_FMUN, 0); /* GT bit off */
gemtek_bu2614_set(gt, BU2614_TEST, 0);
gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_PLL_OFF);
gemtek_bu2614_set(gt, BU2614_FREQ, 0);
gemtek_bu2614_transmit(gt);
return 0;
}
/* Read bus contents (CE, CK and DA). */
i = inb_p(isa->io);
/* Write it back with mute flag set. */
outb_p((i >> 5) | (mute ? GEMTEK_MT : 0), isa->io);
udelay(SHORT_DELAY);
return 0;
}
static u32 gemtek_g_rxsubchans(struct radio_isa_card *isa)
{
if (inb_p(isa->io) & GEMTEK_NS)
return V4L2_TUNER_SUB_MONO;
return V4L2_TUNER_SUB_STEREO;
}
/*
* Check if requested card acts like GemTek Radio card.
*/
static bool gemtek_probe(struct radio_isa_card *isa, int io)
{
int i, q;
q = inb_p(io); /* Read bus contents before probing. */
/* Try to turn on CE, CK and DA respectively and check if card responds
properly. */
for (i = 0; i < 3; ++i) {
outb_p(1 << i, io);
udelay(SHORT_DELAY);
if ((inb_p(io) & ~GEMTEK_NS) != (0x17 | (1 << (i + 5))))
return false;
}
outb_p(q >> 5, io); /* Write bus contents back. */
udelay(SHORT_DELAY);
return true;
}
static const struct radio_isa_ops gemtek_ops = {
.alloc = gemtek_alloc,
.probe = gemtek_probe,
.s_mute_volume = gemtek_s_mute_volume,
.s_frequency = gemtek_s_frequency,
.g_rxsubchans = gemtek_g_rxsubchans,
};
static const int gemtek_ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
#ifdef CONFIG_PNP
static const struct pnp_device_id gemtek_pnp_devices[] = {
/* AOpen FX-3D/Pro Radio */
{.id = "ADS7183", .driver_data = 0},
{.id = ""}
};
MODULE_DEVICE_TABLE(pnp, gemtek_pnp_devices);
#endif
static struct radio_isa_driver gemtek_driver = {
.driver = {
.match = radio_isa_match,
.probe = radio_isa_probe,
.remove = radio_isa_remove,
.driver = {
.name = "radio-gemtek",
},
},
#ifdef CONFIG_PNP
.pnp_driver = {
.name = "radio-gemtek",
.id_table = gemtek_pnp_devices,
.probe = radio_isa_pnp_probe,
.remove = radio_isa_pnp_remove,
},
#endif
.io_params = io,
.radio_nr_params = radio_nr,
.io_ports = gemtek_ioports,
.num_of_io_ports = ARRAY_SIZE(gemtek_ioports),
.region_size = 1,
.card = "GemTek Radio",
.ops = &gemtek_ops,
.has_stereo = true,
};
static int __init gemtek_init(void)
{
gemtek_driver.probe = probe;
#ifdef CONFIG_PNP
pnp_register_driver(&gemtek_driver.pnp_driver);
#endif
return isa_register_driver(&gemtek_driver.driver, GEMTEK_MAX);
}
static void __exit gemtek_exit(void)
{
hardmute = true; /* Turn off PLL */
#ifdef CONFIG_PNP
pnp_unregister_driver(&gemtek_driver.pnp_driver);
#endif
isa_unregister_driver(&gemtek_driver.driver);
}
module_init(gemtek_init);
module_exit(gemtek_exit);
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