857e594ad5
Frequency calculation to use better math. It's still the same IF offset and step size (which are not the same as the datasheet says) as the code was before. It's just more efficient and accurate. Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Reviewed-by: Pekka Seppänen <pexu@kapsi.fi> Signed-off-by: Douglas Schilling Landgraf <dougsland@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
681 lines
16 KiB
C
681 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 BU2614_NOPS 8 /* Number of supported operations */
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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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unsigned long bu2614data[BU2614_NOPS];
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};
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enum {
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BU2614_VOID,
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BU2614_FREQ, /* D0..D15, Frequency data */
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BU2614_PORT, /* P0..P2, Output port control data */
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BU2614_FMES, /* CT, Frequency measurement beginning data */
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BU2614_STDF, /* R0..R2, Standard frequency data */
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BU2614_SWIN, /* S, Switch between FMIN / AMIN */
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BU2614_SWAL, /* PS, Swallow counter division (AMIN only) */
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BU2614_FMUN, /* GT, Frequency measurement time and unlock */
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BU2614_TEST /* TS, Test data is input */
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};
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struct bu2614_op {
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int op; /* Operation */
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int size; /* Data size */
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};
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static struct gemtek_device gemtek_unit;
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static struct bu2614_op bu2614ops[] = {
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{.op = BU2614_FREQ,
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.size = 0x10},
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{.op = BU2614_PORT,
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.size = 0x03},
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{.op = BU2614_VOID,
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.size = 0x04},
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{.op = BU2614_FMES,
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.size = 0x01},
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{.op = BU2614_STDF,
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.size = 0x03},
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{.op = BU2614_SWIN,
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.size = 0x01},
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{.op = BU2614_SWAL,
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.size = 0x01},
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{.op = BU2614_VOID,
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.size = 0x01},
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{.op = BU2614_FMUN,
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.size = 0x01},
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{.op = BU2614_TEST,
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.size = 0x01}
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};
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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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static void gemtek_bu2614_set(struct gemtek_device *dev, int op,
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unsigned long data)
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{
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int i, q;
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for (i = 0, q = 0; q < ARRAY_SIZE(dev->bu2614data); ++i) {
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if (bu2614ops[i].op == op) {
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dev->bu2614data[q] =
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data & ((1 << bu2614ops[i].size) - 1);
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return;
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}
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if (bu2614ops[i].op != BU2614_VOID)
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++q;
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}
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}
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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 = 0; q < ARRAY_SIZE(dev->bu2614data); ++i) {
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for (bit = 0; bit < bu2614ops[i].size; ++bit) {
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if (bu2614ops[i].op != BU2614_VOID &&
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dev->bu2614data[q] & (1 << bit)) {
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outb_p(mute | GEMTEK_CE | GEMTEK_DA, io);
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udelay(SHORT_DELAY);
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outb_p(mute | GEMTEK_CE | GEMTEK_DA |
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GEMTEK_CK, io);
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udelay(SHORT_DELAY);
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} else {
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outb_p(mute | GEMTEK_CE, io);
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udelay(SHORT_DELAY);
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outb_p(mute | GEMTEK_CE | GEMTEK_CK, io);
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udelay(SHORT_DELAY);
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}
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}
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if (bu2614ops[i].op != BU2614_VOID)
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++q;
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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 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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.compat_ioctl = v4l_compat_ioctl32,
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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)
|
|
{
|
|
struct video_device *dev = video_devdata(file);
|
|
struct gemtek_device *rt = dev->priv;
|
|
|
|
f->type = V4L2_TUNER_RADIO;
|
|
f->frequency = rt->lastfreq;
|
|
return 0;
|
|
}
|
|
|
|
static int vidioc_queryctrl(struct file *file, void *priv,
|
|
struct v4l2_queryctrl *qc)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(radio_qctrl); ++i) {
|
|
if (qc->id && qc->id == radio_qctrl[i].id) {
|
|
memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
|
|
return 0;
|
|
}
|
|
}
|
|
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,
|
|
.hardware = VID_HARDWARE_GEMTEK,
|
|
.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)
|
|
{
|
|
int i;
|
|
|
|
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;
|
|
for (i = 0; i < ARRAY_SIZE(gemtek_unit.bu2614data); ++i)
|
|
gemtek_unit.bu2614data[i] = 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);
|