646 lines
16 KiB
C
646 lines
16 KiB
C
/* GemTek radio card driver for Linux (C) 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.Cox@linux.org>
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* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
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*
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* TODO: Allow for more than one of these foolish entities :-)
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*
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* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.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/delay.h> /* udelay */
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#include <asm/io.h> /* outb, outb_p */
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#include <asm/uaccess.h> /* copy to/from user */
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#include <linux/videodev2.h> /* kernel radio structs */
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#include <media/v4l2-common.h>
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#include <linux/spinlock.h>
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#include <linux/version.h> /* for KERNEL_VERSION MACRO */
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#define RADIO_VERSION KERNEL_VERSION(0,0,3)
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#define RADIO_BANNER "GemTek Radio card driver: v0.0.3"
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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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/*
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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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static int io = CONFIG_RADIO_GEMTEK_PORT;
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static int probe = CONFIG_RADIO_GEMTEK_PROBE;
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static int hardmute;
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static int shutdown = 1;
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static int keepmuted = 1;
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static int initmute = 1;
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static int radio_nr = -1;
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module_param(io, int, 0444);
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MODULE_PARM_DESC(io, "Force I/O port for the GemTek Radio card if automatic "
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"probing is disabled or fails. The most common I/O ports are: 0x20c "
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"0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
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"work for the combined sound/radiocard).");
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module_param(probe, bool, 0444);
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MODULE_PARM_DESC(probe, "Enable automatic device probing. Note: only the most "
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"common I/O ports used by the card are probed.");
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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 "
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"reduce static noise.");
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module_param(shutdown, bool, 0644);
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MODULE_PARM_DESC(shutdown, "Enable shutting down PLL and muting line when "
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"module is unloaded.");
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module_param(keepmuted, bool, 0644);
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MODULE_PARM_DESC(keepmuted, "Keep card muted even when frequency is changed.");
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module_param(initmute, bool, 0444);
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MODULE_PARM_DESC(initmute, "Mute card when module is loaded.");
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module_param(radio_nr, int, 0444);
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/*
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* Functions for controlling the card.
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*/
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#define GEMTEK_LOWFREQ (87*16000)
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#define GEMTEK_HIGHFREQ (108*16000)
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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_device {
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unsigned long lastfreq;
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int 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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static struct gemtek_device gemtek_unit;
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static spinlock_t lock;
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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_device *dev)
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{
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int i, bit, q, mute;
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spin_lock(&lock);
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mute = dev->muted ? GEMTEK_MT : 0x00;
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outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
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udelay(SHORT_DELAY);
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outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
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udelay(LONG_DELAY);
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for (i = 0, q = dev->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, io);
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udelay(SHORT_DELAY);
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outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, io);
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udelay(SHORT_DELAY);
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}
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outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
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udelay(SHORT_DELAY);
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outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
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udelay(LONG_DELAY);
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spin_unlock(&lock);
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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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/*
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* Set FM-frequency.
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*/
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static void gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
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{
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if (keepmuted && hardmute && dev->muted)
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return;
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if (freq < GEMTEK_LOWFREQ)
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freq = GEMTEK_LOWFREQ;
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else if (freq > GEMTEK_HIGHFREQ)
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freq = GEMTEK_HIGHFREQ;
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dev->lastfreq = freq;
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dev->muted = 0;
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gemtek_bu2614_set(dev, BU2614_PORT, 0);
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gemtek_bu2614_set(dev, BU2614_FMES, 0);
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gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode */
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gemtek_bu2614_set(dev, BU2614_SWAL, 0);
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gemtek_bu2614_set(dev, BU2614_FMUN, 1); /* GT bit set */
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gemtek_bu2614_set(dev, BU2614_TEST, 0);
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gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
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gemtek_bu2614_set(dev, BU2614_FREQ, gemtek_convfreq(freq));
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gemtek_bu2614_transmit(dev);
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}
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/*
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* Set mute flag.
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*/
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static void gemtek_mute(struct gemtek_device *dev)
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{
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int i;
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dev->muted = 1;
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if (hardmute) {
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/* Turn off PLL, disable data output */
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gemtek_bu2614_set(dev, BU2614_PORT, 0);
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gemtek_bu2614_set(dev, BU2614_FMES, 0); /* CT bit off */
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gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode */
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gemtek_bu2614_set(dev, BU2614_SWAL, 0);
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gemtek_bu2614_set(dev, BU2614_FMUN, 0); /* GT bit off */
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gemtek_bu2614_set(dev, BU2614_TEST, 0);
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gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_PLL_OFF);
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gemtek_bu2614_set(dev, BU2614_FREQ, 0);
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gemtek_bu2614_transmit(dev);
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} else {
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spin_lock(&lock);
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/* Read bus contents (CE, CK and DA). */
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i = inb_p(io);
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/* Write it back with mute flag set. */
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outb_p((i >> 5) | GEMTEK_MT, io);
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udelay(SHORT_DELAY);
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spin_unlock(&lock);
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}
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}
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/*
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* Unset mute flag.
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*/
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static void gemtek_unmute(struct gemtek_device *dev)
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{
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int i;
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dev->muted = 0;
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if (hardmute) {
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/* Turn PLL back on. */
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gemtek_setfreq(dev, dev->lastfreq);
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} else {
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spin_lock(&lock);
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i = inb_p(io);
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outb_p(i >> 5, io);
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udelay(SHORT_DELAY);
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spin_unlock(&lock);
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}
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}
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/*
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* Get signal strength (= stereo status).
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*/
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static inline int gemtek_getsigstr(void)
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{
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return inb_p(io) & GEMTEK_NS ? 0 : 1;
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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 int gemtek_verify(int port)
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{
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static int verified = -1;
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int i, q;
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if (verified == port)
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return 1;
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spin_lock(&lock);
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q = inb_p(port); /* 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, port);
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udelay(SHORT_DELAY);
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if ((inb_p(port) & (~GEMTEK_NS)) != (0x17 | (1 << (i + 5)))) {
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spin_unlock(&lock);
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return 0;
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}
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}
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outb_p(q >> 5, port); /* Write bus contents back. */
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udelay(SHORT_DELAY);
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spin_unlock(&lock);
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verified = port;
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return 1;
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}
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/*
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* Automatic probing for card.
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*/
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static int gemtek_probe(void)
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{
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int ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
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int i;
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if (!probe) {
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printk(KERN_INFO "Automatic device probing disabled.\n");
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return -1;
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}
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printk(KERN_INFO "Automatic device probing enabled.\n");
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for (i = 0; i < ARRAY_SIZE(ioports); ++i) {
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printk(KERN_INFO "Trying I/O port 0x%x...\n", ioports[i]);
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if (!request_region(ioports[i], 1, "gemtek-probe")) {
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printk(KERN_WARNING "I/O port 0x%x busy!\n",
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ioports[i]);
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continue;
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}
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if (gemtek_verify(ioports[i])) {
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printk(KERN_INFO "Card found from I/O port "
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"0x%x!\n", ioports[i]);
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release_region(ioports[i], 1);
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io = ioports[i];
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return io;
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}
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release_region(ioports[i], 1);
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}
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printk(KERN_ERR "Automatic probing failed!\n");
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return -1;
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}
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/*
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* Video 4 Linux stuff.
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*/
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static struct v4l2_queryctrl radio_qctrl[] = {
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{
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.id = V4L2_CID_AUDIO_MUTE,
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.name = "Mute",
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.minimum = 0,
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.maximum = 1,
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.default_value = 1,
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.type = V4L2_CTRL_TYPE_BOOLEAN,
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}, {
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.id = V4L2_CID_AUDIO_VOLUME,
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.name = "Volume",
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.minimum = 0,
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.maximum = 65535,
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.step = 65535,
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.default_value = 0xff,
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.type = V4L2_CTRL_TYPE_INTEGER,
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}
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};
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static const struct file_operations gemtek_fops = {
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.owner = THIS_MODULE,
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.open = video_exclusive_open,
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.release = video_exclusive_release,
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.ioctl = video_ioctl2,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = v4l_compat_ioctl32,
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#endif
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.llseek = no_llseek
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};
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *v)
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{
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strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
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strlcpy(v->card, "GemTek", sizeof(v->card));
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sprintf(v->bus_info, "ISA");
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v->version = RADIO_VERSION;
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v->capabilities = V4L2_CAP_TUNER;
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
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{
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if (v->index > 0)
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return -EINVAL;
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strcpy(v->name, "FM");
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v->type = V4L2_TUNER_RADIO;
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v->rangelow = GEMTEK_LOWFREQ;
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v->rangehigh = GEMTEK_HIGHFREQ;
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v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
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v->signal = 0xffff * gemtek_getsigstr();
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if (v->signal) {
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v->audmode = V4L2_TUNER_MODE_STEREO;
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v->rxsubchans = V4L2_TUNER_SUB_STEREO;
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} else {
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v->audmode = V4L2_TUNER_MODE_MONO;
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v->rxsubchans = V4L2_TUNER_SUB_MONO;
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}
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
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{
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if (v->index > 0)
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return -EINVAL;
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return 0;
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}
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static int vidioc_s_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct video_device *dev = video_devdata(file);
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struct gemtek_device *rt = dev->priv;
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gemtek_setfreq(rt, f->frequency);
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return 0;
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}
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static int vidioc_g_frequency(struct file *file, void *priv,
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struct v4l2_frequency *f)
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{
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struct video_device *dev = video_devdata(file);
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struct gemtek_device *rt = dev->priv;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = rt->lastfreq;
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return 0;
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}
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static int vidioc_queryctrl(struct file *file, void *priv,
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struct v4l2_queryctrl *qc)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(radio_qctrl); ++i) {
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if (qc->id && qc->id == radio_qctrl[i].id) {
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memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
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return 0;
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}
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int vidioc_g_ctrl(struct file *file, void *priv,
|
|
struct v4l2_control *ctrl)
|
|
{
|
|
struct video_device *dev = video_devdata(file);
|
|
struct gemtek_device *rt = dev->priv;
|
|
|
|
switch (ctrl->id) {
|
|
case V4L2_CID_AUDIO_MUTE:
|
|
ctrl->value = rt->muted;
|
|
return 0;
|
|
case V4L2_CID_AUDIO_VOLUME:
|
|
if (rt->muted)
|
|
ctrl->value = 0;
|
|
else
|
|
ctrl->value = 65535;
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int vidioc_s_ctrl(struct file *file, void *priv,
|
|
struct v4l2_control *ctrl)
|
|
{
|
|
struct video_device *dev = video_devdata(file);
|
|
struct gemtek_device *rt = dev->priv;
|
|
|
|
switch (ctrl->id) {
|
|
case V4L2_CID_AUDIO_MUTE:
|
|
if (ctrl->value)
|
|
gemtek_mute(rt);
|
|
else
|
|
gemtek_unmute(rt);
|
|
return 0;
|
|
case V4L2_CID_AUDIO_VOLUME:
|
|
if (ctrl->value)
|
|
gemtek_unmute(rt);
|
|
else
|
|
gemtek_mute(rt);
|
|
return 0;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
|
|
{
|
|
if (a->index > 1)
|
|
return -EINVAL;
|
|
|
|
strcpy(a->name, "Radio");
|
|
a->capability = V4L2_AUDCAP_STEREO;
|
|
return 0;
|
|
}
|
|
|
|
static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
|
|
{
|
|
*i = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
|
|
{
|
|
if (i != 0)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
|
|
{
|
|
if (a->index != 0)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static struct video_device gemtek_radio = {
|
|
.owner = THIS_MODULE,
|
|
.name = "GemTek Radio card",
|
|
.type = VID_TYPE_TUNER,
|
|
.fops = &gemtek_fops,
|
|
.vidioc_querycap = vidioc_querycap,
|
|
.vidioc_g_tuner = vidioc_g_tuner,
|
|
.vidioc_s_tuner = vidioc_s_tuner,
|
|
.vidioc_g_audio = vidioc_g_audio,
|
|
.vidioc_s_audio = vidioc_s_audio,
|
|
.vidioc_g_input = vidioc_g_input,
|
|
.vidioc_s_input = vidioc_s_input,
|
|
.vidioc_g_frequency = vidioc_g_frequency,
|
|
.vidioc_s_frequency = vidioc_s_frequency,
|
|
.vidioc_queryctrl = vidioc_queryctrl,
|
|
.vidioc_g_ctrl = vidioc_g_ctrl,
|
|
.vidioc_s_ctrl = vidioc_s_ctrl
|
|
};
|
|
|
|
/*
|
|
* Initialization / cleanup related stuff.
|
|
*/
|
|
|
|
/*
|
|
* Initilize card.
|
|
*/
|
|
static int __init gemtek_init(void)
|
|
{
|
|
printk(KERN_INFO RADIO_BANNER "\n");
|
|
|
|
spin_lock_init(&lock);
|
|
|
|
gemtek_probe();
|
|
if (io) {
|
|
if (!request_region(io, 1, "gemtek")) {
|
|
printk(KERN_ERR "I/O port 0x%x already in use.\n", io);
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (!gemtek_verify(io))
|
|
printk(KERN_WARNING "Card at I/O port 0x%x does not "
|
|
"respond properly, check your "
|
|
"configuration.\n", io);
|
|
else
|
|
printk(KERN_INFO "Using I/O port 0x%x.\n", io);
|
|
} else if (probe) {
|
|
printk(KERN_ERR "Automatic probing failed and no "
|
|
"fixed I/O port defined.\n");
|
|
return -ENODEV;
|
|
} else {
|
|
printk(KERN_ERR "Automatic probing disabled but no fixed "
|
|
"I/O port defined.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
gemtek_radio.priv = &gemtek_unit;
|
|
|
|
if (video_register_device(&gemtek_radio, VFL_TYPE_RADIO,
|
|
radio_nr) == -1) {
|
|
release_region(io, 1);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* Set defaults */
|
|
gemtek_unit.lastfreq = GEMTEK_LOWFREQ;
|
|
gemtek_unit.bu2614data = 0;
|
|
|
|
if (initmute)
|
|
gemtek_mute(&gemtek_unit);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Module cleanup
|
|
*/
|
|
static void __exit gemtek_exit(void)
|
|
{
|
|
if (shutdown) {
|
|
hardmute = 1; /* Turn off PLL */
|
|
gemtek_mute(&gemtek_unit);
|
|
} else {
|
|
printk(KERN_INFO "Module unloaded but card not muted!\n");
|
|
}
|
|
|
|
video_unregister_device(&gemtek_radio);
|
|
release_region(io, 1);
|
|
}
|
|
|
|
module_init(gemtek_init);
|
|
module_exit(gemtek_exit);
|