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