![Hans Verkuil](/assets/img/avatar_default.png)
Many radio drivers did not check the tuner and type field correctly for g/s_frequency. These checks have now been added. Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
470 lines
11 KiB
C
470 lines
11 KiB
C
/* zoltrix radio plus driver for Linux radio support
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* (c) 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@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, 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/version.h> /* for KERNEL_VERSION MACRO */
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#include <linux/io.h> /* outb, outb_p */
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#include <media/v4l2-device.h>
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#include <media/v4l2-ioctl.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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#ifndef CONFIG_RADIO_ZOLTRIX_PORT
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#define CONFIG_RADIO_ZOLTRIX_PORT -1
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#endif
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static int io = CONFIG_RADIO_ZOLTRIX_PORT;
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static int radio_nr = -1;
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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
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module_param(radio_nr, int, 0);
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#define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
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struct zoltrix {
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struct v4l2_device v4l2_dev;
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struct video_device vdev;
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int io;
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int curvol;
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unsigned long curfreq;
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int muted;
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unsigned int stereo;
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struct mutex lock;
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};
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static struct zoltrix zoltrix_card;
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static int zol_setvol(struct zoltrix *zol, int vol)
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{
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zol->curvol = vol;
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if (zol->muted)
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return 0;
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mutex_lock(&zol->lock);
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if (vol == 0) {
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outb(0, zol->io);
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outb(0, zol->io);
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inb(zol->io + 3); /* Zoltrix needs to be read to confirm */
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mutex_unlock(&zol->lock);
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return 0;
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}
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outb(zol->curvol-1, zol->io);
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msleep(10);
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inb(zol->io + 2);
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mutex_unlock(&zol->lock);
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return 0;
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}
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static void zol_mute(struct zoltrix *zol)
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{
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zol->muted = 1;
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mutex_lock(&zol->lock);
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outb(0, zol->io);
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outb(0, zol->io);
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inb(zol->io + 3); /* Zoltrix needs to be read to confirm */
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mutex_unlock(&zol->lock);
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}
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static void zol_unmute(struct zoltrix *zol)
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{
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zol->muted = 0;
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zol_setvol(zol, zol->curvol);
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}
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static int zol_setfreq(struct zoltrix *zol, unsigned long freq)
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{
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/* tunes the radio to the desired frequency */
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struct v4l2_device *v4l2_dev = &zol->v4l2_dev;
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unsigned long long bitmask, f, m;
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unsigned int stereo = zol->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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mutex_lock(&zol->lock);
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zol->curfreq = freq;
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outb(0, zol->io);
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outb(0, zol->io);
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inb(zol->io + 3); /* Zoltrix needs to be read to confirm */
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outb(0x40, zol->io);
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outb(0xc0, zol->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, zol->io);
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udelay(50);
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outb(0x00, zol->io);
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udelay(50);
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outb(0x80, zol->io);
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udelay(50);
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} else {
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outb(0xc0, zol->io);
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udelay(50);
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outb(0x40, zol->io);
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udelay(50);
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outb(0xc0, zol->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, zol->io);
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outb(0xc0, zol->io);
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outb(0x40, zol->io);
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udelay(1000);
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inb(zol->io + 2);
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udelay(1000);
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if (zol->muted) {
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outb(0, zol->io);
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outb(0, zol->io);
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inb(zol->io + 3);
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udelay(1000);
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}
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mutex_unlock(&zol->lock);
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if (!zol->muted)
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zol_setvol(zol, zol->curvol);
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return 0;
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}
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/* Get signal strength */
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static int zol_getsigstr(struct zoltrix *zol)
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{
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int a, b;
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mutex_lock(&zol->lock);
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outb(0x00, zol->io); /* This stuff I found to do nothing */
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outb(zol->curvol, zol->io);
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msleep(20);
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a = inb(zol->io);
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msleep(10);
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b = inb(zol->io);
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mutex_unlock(&zol->lock);
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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;
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}
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static int zol_is_stereo(struct zoltrix *zol)
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{
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int x1, x2;
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mutex_lock(&zol->lock);
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outb(0x00, zol->io);
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outb(zol->curvol, zol->io);
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msleep(20);
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x1 = inb(zol->io);
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msleep(10);
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x2 = inb(zol->io);
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mutex_unlock(&zol->lock);
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return x1 == x2 && x1 == 0xcf;
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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-zoltrix", sizeof(v->driver));
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strlcpy(v->card, "Zoltrix Radio", sizeof(v->card));
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strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
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v->version = RADIO_VERSION;
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v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
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return 0;
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}
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static int vidioc_g_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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struct zoltrix *zol = video_drvdata(file);
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if (v->index > 0)
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return -EINVAL;
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strlcpy(v->name, "FM", sizeof(v->name));
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v->type = V4L2_TUNER_RADIO;
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v->rangelow = 88 * 16000;
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v->rangehigh = 108 * 16000;
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v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
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v->capability = V4L2_TUNER_CAP_LOW;
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if (zol_is_stereo(zol))
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v->audmode = V4L2_TUNER_MODE_STEREO;
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else
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v->audmode = V4L2_TUNER_MODE_MONO;
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v->signal = 0xFFFF * zol_getsigstr(zol);
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return 0;
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}
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static int vidioc_s_tuner(struct file *file, void *priv,
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struct v4l2_tuner *v)
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{
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return v->index ? -EINVAL : 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 zoltrix *zol = video_drvdata(file);
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if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
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return -EINVAL;
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if (zol_setfreq(zol, f->frequency) != 0)
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return -EINVAL;
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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 zoltrix *zol = video_drvdata(file);
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if (f->tuner != 0)
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return -EINVAL;
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f->type = V4L2_TUNER_RADIO;
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f->frequency = zol->curfreq;
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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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switch (qc->id) {
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case V4L2_CID_AUDIO_MUTE:
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return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
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case V4L2_CID_AUDIO_VOLUME:
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return v4l2_ctrl_query_fill(qc, 0, 65535, 4096, 65535);
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}
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return -EINVAL;
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}
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static int vidioc_g_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct zoltrix *zol = video_drvdata(file);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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ctrl->value = zol->muted;
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return 0;
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case V4L2_CID_AUDIO_VOLUME:
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ctrl->value = zol->curvol * 4096;
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return 0;
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}
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return -EINVAL;
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}
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static int vidioc_s_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
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{
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struct zoltrix *zol = video_drvdata(file);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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if (ctrl->value)
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zol_mute(zol);
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else {
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zol_unmute(zol);
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zol_setvol(zol, zol->curvol);
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}
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return 0;
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case V4L2_CID_AUDIO_VOLUME:
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zol_setvol(zol, ctrl->value / 4096);
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return 0;
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}
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zol->stereo = 1;
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if (zol_setfreq(zol, zol->curfreq) != 0)
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return -EINVAL;
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#if 0
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/* FIXME: Implement stereo/mono switch on V4L2 */
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if (v->mode & VIDEO_SOUND_STEREO) {
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zol->stereo = 1;
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zol_setfreq(zol, zol->curfreq);
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}
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if (v->mode & VIDEO_SOUND_MONO) {
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zol->stereo = 0;
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zol_setfreq(zol, zol->curfreq);
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}
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#endif
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return -EINVAL;
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}
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static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
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{
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*i = 0;
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return 0;
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}
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static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
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{
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return i ? -EINVAL : 0;
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}
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static int vidioc_g_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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a->index = 0;
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strlcpy(a->name, "Radio", sizeof(a->name));
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a->capability = V4L2_AUDCAP_STEREO;
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return 0;
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}
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static int vidioc_s_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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return a->index ? -EINVAL : 0;
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}
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static const struct v4l2_file_operations zoltrix_fops =
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{
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.owner = THIS_MODULE,
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.ioctl = video_ioctl2,
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};
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static const struct v4l2_ioctl_ops zoltrix_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_g_tuner = vidioc_g_tuner,
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.vidioc_s_tuner = vidioc_s_tuner,
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.vidioc_g_audio = vidioc_g_audio,
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.vidioc_s_audio = vidioc_s_audio,
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.vidioc_g_input = vidioc_g_input,
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.vidioc_s_input = vidioc_s_input,
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.vidioc_g_frequency = vidioc_g_frequency,
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.vidioc_s_frequency = vidioc_s_frequency,
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.vidioc_queryctrl = vidioc_queryctrl,
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.vidioc_g_ctrl = vidioc_g_ctrl,
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.vidioc_s_ctrl = vidioc_s_ctrl,
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};
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static int __init zoltrix_init(void)
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{
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struct zoltrix *zol = &zoltrix_card;
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struct v4l2_device *v4l2_dev = &zol->v4l2_dev;
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int res;
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strlcpy(v4l2_dev->name, "zoltrix", sizeof(v4l2_dev->name));
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zol->io = io;
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if (zol->io == -1) {
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v4l2_err(v4l2_dev, "You must set an I/O address with io=0x20c or 0x30c\n");
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return -EINVAL;
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}
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if (zol->io != 0x20c && zol->io != 0x30c) {
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v4l2_err(v4l2_dev, "invalid port, try 0x20c or 0x30c\n");
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return -ENXIO;
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}
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if (!request_region(zol->io, 2, "zoltrix")) {
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v4l2_err(v4l2_dev, "port 0x%x already in use\n", zol->io);
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return -EBUSY;
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}
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res = v4l2_device_register(NULL, v4l2_dev);
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if (res < 0) {
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release_region(zol->io, 2);
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v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
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return res;
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}
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strlcpy(zol->vdev.name, v4l2_dev->name, sizeof(zol->vdev.name));
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zol->vdev.v4l2_dev = v4l2_dev;
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zol->vdev.fops = &zoltrix_fops;
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zol->vdev.ioctl_ops = &zoltrix_ioctl_ops;
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zol->vdev.release = video_device_release_empty;
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video_set_drvdata(&zol->vdev, zol);
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if (video_register_device(&zol->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
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v4l2_device_unregister(v4l2_dev);
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release_region(zol->io, 2);
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return -EINVAL;
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}
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v4l2_info(v4l2_dev, "Zoltrix Radio Plus card driver.\n");
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mutex_init(&zol->lock);
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/* mute card - prevents noisy bootups */
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/* this ensures that the volume is all the way down */
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outb(0, zol->io);
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outb(0, zol->io);
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msleep(20);
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inb(zol->io + 3);
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zol->curvol = 0;
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zol->stereo = 1;
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return 0;
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}
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static void __exit zoltrix_exit(void)
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{
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struct zoltrix *zol = &zoltrix_card;
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video_unregister_device(&zol->vdev);
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v4l2_device_unregister(&zol->v4l2_dev);
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release_region(zol->io, 2);
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}
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module_init(zoltrix_init);
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module_exit(zoltrix_exit);
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