250 lines
6.3 KiB
C
250 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Zoltrix Radio Plus driver
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* Copyright 1998 C. van Schaik <carl@leg.uct.ac.za>
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*
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* BUGS
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* Due to the inconsistency in reading from the signal flags
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* it is difficult to get an accurate tuned signal.
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*
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* It seems that the card is not linear to 0 volume. It cuts off
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* at a low volume, and it is not possible (at least I have not found)
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* to get fine volume control over the low volume range.
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*
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* Some code derived from code by Romolo Manfredini
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* romolo@bicnet.it
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*
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* 1999-05-06 - (C. van Schaik)
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* - Make signal strength and stereo scans
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* kinder to cpu while in delay
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* 1999-01-05 - (C. van Schaik)
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* - Changed tuning to 1/160Mhz accuracy
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* - Added stereo support
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* (card defaults to stereo)
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* (can explicitly force mono on the card)
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* (can detect if station is in stereo)
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* - Added unmute function
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* - Reworked ioctl functions
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* 2002-07-15 - Fix Stereo typo
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*
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* 2006-07-24 - Converted to V4L2 API
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* by Mauro Carvalho Chehab <mchehab@kernel.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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*
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* Note that this is the driver for the Zoltrix Radio Plus.
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* This driver does not work for the Zoltrix Radio Plus 108 or the
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* Zoltrix Radio Plus for Windows.
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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, msleep */
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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/slab.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.h>
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#include "radio-isa.h"
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MODULE_AUTHOR("C. van Schaik");
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MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
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MODULE_LICENSE("GPL");
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MODULE_VERSION("0.1.99");
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#ifndef CONFIG_RADIO_ZOLTRIX_PORT
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#define CONFIG_RADIO_ZOLTRIX_PORT -1
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#endif
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#define ZOLTRIX_MAX 2
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static int io[ZOLTRIX_MAX] = { [0] = CONFIG_RADIO_ZOLTRIX_PORT,
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[1 ... (ZOLTRIX_MAX - 1)] = -1 };
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static int radio_nr[ZOLTRIX_MAX] = { [0 ... (ZOLTRIX_MAX - 1)] = -1 };
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module_param_array(io, int, NULL, 0444);
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MODULE_PARM_DESC(io, "I/O addresses of the Zoltrix Radio Plus card (0x20c or 0x30c)");
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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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struct zoltrix {
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struct radio_isa_card isa;
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int curvol;
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bool muted;
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};
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static struct radio_isa_card *zoltrix_alloc(void)
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{
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struct zoltrix *zol = kzalloc(sizeof(*zol), GFP_KERNEL);
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return zol ? &zol->isa : NULL;
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}
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static int zoltrix_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
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{
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
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zol->curvol = vol;
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zol->muted = mute;
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if (mute || vol == 0) {
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outb(0, isa->io);
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outb(0, isa->io);
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inb(isa->io + 3); /* Zoltrix needs to be read to confirm */
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return 0;
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}
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outb(vol - 1, isa->io);
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msleep(10);
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inb(isa->io + 2);
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return 0;
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}
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/* tunes the radio to the desired frequency */
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static int zoltrix_s_frequency(struct radio_isa_card *isa, u32 freq)
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{
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
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struct v4l2_device *v4l2_dev = &isa->v4l2_dev;
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unsigned long long bitmask, f, m;
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bool stereo = isa->stereo;
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int i;
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if (freq == 0) {
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v4l2_warn(v4l2_dev, "cannot set a frequency of 0.\n");
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return -EINVAL;
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}
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m = (freq / 160 - 8800) * 2;
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f = (unsigned long long)m + 0x4d1c;
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bitmask = 0xc480402c10080000ull;
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i = 45;
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outb(0, isa->io);
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outb(0, isa->io);
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inb(isa->io + 3); /* Zoltrix needs to be read to confirm */
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outb(0x40, isa->io);
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outb(0xc0, isa->io);
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bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ (stereo << 31));
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while (i--) {
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if ((bitmask & 0x8000000000000000ull) != 0) {
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outb(0x80, isa->io);
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udelay(50);
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outb(0x00, isa->io);
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udelay(50);
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outb(0x80, isa->io);
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udelay(50);
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} else {
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outb(0xc0, isa->io);
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udelay(50);
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outb(0x40, isa->io);
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udelay(50);
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outb(0xc0, isa->io);
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udelay(50);
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}
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bitmask *= 2;
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}
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/* termination sequence */
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outb(0x80, isa->io);
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outb(0xc0, isa->io);
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outb(0x40, isa->io);
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udelay(1000);
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inb(isa->io + 2);
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udelay(1000);
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return zoltrix_s_mute_volume(isa, zol->muted, zol->curvol);
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}
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/* Get signal strength */
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static u32 zoltrix_g_rxsubchans(struct radio_isa_card *isa)
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{
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
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int a, b;
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outb(0x00, isa->io); /* This stuff I found to do nothing */
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outb(zol->curvol, isa->io);
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msleep(20);
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a = inb(isa->io);
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msleep(10);
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b = inb(isa->io);
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return (a == b && a == 0xcf) ?
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V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
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}
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static u32 zoltrix_g_signal(struct radio_isa_card *isa)
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{
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struct zoltrix *zol = container_of(isa, struct zoltrix, isa);
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int a, b;
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outb(0x00, isa->io); /* This stuff I found to do nothing */
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outb(zol->curvol, isa->io);
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msleep(20);
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a = inb(isa->io);
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msleep(10);
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b = inb(isa->io);
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if (a != b)
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return 0;
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/* I found this out by playing with a binary scanner on the card io */
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return (a == 0xcf || a == 0xdf || a == 0xef) ? 0xffff : 0;
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}
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static int zoltrix_s_stereo(struct radio_isa_card *isa, bool stereo)
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{
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return zoltrix_s_frequency(isa, isa->freq);
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}
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static const struct radio_isa_ops zoltrix_ops = {
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.alloc = zoltrix_alloc,
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.s_mute_volume = zoltrix_s_mute_volume,
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.s_frequency = zoltrix_s_frequency,
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.s_stereo = zoltrix_s_stereo,
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.g_rxsubchans = zoltrix_g_rxsubchans,
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.g_signal = zoltrix_g_signal,
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};
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static const int zoltrix_ioports[] = { 0x20c, 0x30c };
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static struct radio_isa_driver zoltrix_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-zoltrix",
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},
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},
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.io_params = io,
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.radio_nr_params = radio_nr,
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.io_ports = zoltrix_ioports,
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.num_of_io_ports = ARRAY_SIZE(zoltrix_ioports),
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.region_size = 2,
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.card = "Zoltrix Radio Plus",
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.ops = &zoltrix_ops,
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.has_stereo = true,
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.max_volume = 15,
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};
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static int __init zoltrix_init(void)
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{
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return isa_register_driver(&zoltrix_driver.driver, ZOLTRIX_MAX);
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}
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static void __exit zoltrix_exit(void)
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{
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isa_unregister_driver(&zoltrix_driver.driver);
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}
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module_init(zoltrix_init);
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module_exit(zoltrix_exit);
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