![Alexey Klimov](/assets/img/avatar_default.png)
This patch adds printk messages, adds checking if frequency is set, adds return -EINVAL in right places in zoltrix-radio. Signed-off-by: Alexey Klimov <klimov.linux@gmail.com> Signed-off-by: Douglas Schilling Landgraf <dougsland@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
506 lines
11 KiB
C
506 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 <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 <media/v4l2-ioctl.h>
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#include <linux/version.h> /* for KERNEL_VERSION MACRO */
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#define RADIO_VERSION KERNEL_VERSION(0,0,2)
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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 = 4096,
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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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#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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struct zol_device {
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unsigned long in_use;
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int port;
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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 int zol_setvol(struct zol_device *dev, int vol)
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{
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dev->curvol = vol;
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if (dev->muted)
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return 0;
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mutex_lock(&dev->lock);
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if (vol == 0) {
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outb(0, io);
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outb(0, io);
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inb(io + 3); /* Zoltrix needs to be read to confirm */
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mutex_unlock(&dev->lock);
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return 0;
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}
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outb(dev->curvol-1, io);
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msleep(10);
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inb(io + 2);
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mutex_unlock(&dev->lock);
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return 0;
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}
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static void zol_mute(struct zol_device *dev)
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{
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dev->muted = 1;
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mutex_lock(&dev->lock);
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outb(0, io);
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outb(0, io);
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inb(io + 3); /* Zoltrix needs to be read to confirm */
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mutex_unlock(&dev->lock);
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}
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static void zol_unmute(struct zol_device *dev)
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{
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dev->muted = 0;
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zol_setvol(dev, dev->curvol);
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}
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static int zol_setfreq(struct zol_device *dev, unsigned long freq)
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{
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/* tunes the radio to the desired frequency */
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unsigned long long bitmask, f, m;
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unsigned int stereo = dev->stereo;
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int i;
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if (freq == 0) {
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printk(KERN_WARNING "zoltrix: received zero freq. Failed to set.\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(&dev->lock);
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outb(0, io);
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outb(0, io);
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inb(io + 3); /* Zoltrix needs to be read to confirm */
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outb(0x40, io);
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outb(0xc0, 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, io);
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udelay(50);
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outb(0x00, io);
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udelay(50);
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outb(0x80, io);
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udelay(50);
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} else {
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outb(0xc0, io);
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udelay(50);
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outb(0x40, io);
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udelay(50);
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outb(0xc0, 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, io);
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outb(0xc0, io);
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outb(0x40, io);
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udelay(1000);
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inb(io+2);
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udelay(1000);
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if (dev->muted)
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{
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outb(0, io);
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outb(0, io);
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inb(io + 3);
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udelay(1000);
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}
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mutex_unlock(&dev->lock);
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if(!dev->muted)
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{
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zol_setvol(dev, dev->curvol);
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}
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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 zol_device *dev)
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{
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int a, b;
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mutex_lock(&dev->lock);
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outb(0x00, io); /* This stuff I found to do nothing */
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outb(dev->curvol, io);
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msleep(20);
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a = inb(io);
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msleep(10);
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b = inb(io);
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mutex_unlock(&dev->lock);
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if (a != b)
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return (0);
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if ((a == 0xcf) || (a == 0xdf) /* I found this out by playing */
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|| (a == 0xef)) /* with a binary scanner on the card io */
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return (1);
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return (0);
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}
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static int zol_is_stereo (struct zol_device *dev)
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{
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int x1, x2;
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mutex_lock(&dev->lock);
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outb(0x00, io);
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outb(dev->curvol, io);
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msleep(20);
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x1 = inb(io);
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msleep(10);
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x2 = inb(io);
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mutex_unlock(&dev->lock);
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if ((x1 == x2) && (x1 == 0xcf))
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return 1;
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return 0;
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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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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,
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struct v4l2_tuner *v)
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{
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struct zol_device *zol = video_drvdata(file);
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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 = (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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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 zol_device *zol = video_drvdata(file);
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zol->curfreq = f->frequency;
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if (zol_setfreq(zol, zol->curfreq) != 0) {
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printk(KERN_WARNING "zoltrix: Set frequency failed.\n");
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return -EINVAL;
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}
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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 zol_device *zol = video_drvdata(file);
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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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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]),
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sizeof(*qc));
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return 0;
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}
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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 zol_device *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 zol_device *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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printk(KERN_WARNING "zoltrix: Set frequency failed.\n");
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return -EINVAL;
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}
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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_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index > 1)
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return -EINVAL;
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strcpy(a->name, "Radio");
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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_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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if (i != 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_audio(struct file *file, void *priv,
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struct v4l2_audio *a)
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{
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if (a->index != 0)
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return -EINVAL;
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return 0;
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}
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static struct zol_device zoltrix_unit;
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static int zoltrix_exclusive_open(struct inode *inode, struct file *file)
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{
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return test_and_set_bit(0, &zoltrix_unit.in_use) ? -EBUSY : 0;
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}
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static int zoltrix_exclusive_release(struct inode *inode, struct file *file)
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{
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clear_bit(0, &zoltrix_unit.in_use);
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return 0;
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}
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static const struct file_operations zoltrix_fops =
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{
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.owner = THIS_MODULE,
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.open = zoltrix_exclusive_open,
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.release = zoltrix_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 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 struct video_device zoltrix_radio = {
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.name = "Zoltrix Radio Plus",
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.fops = &zoltrix_fops,
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.ioctl_ops = &zoltrix_ioctl_ops,
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.release = video_device_release_empty,
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};
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static int __init zoltrix_init(void)
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{
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if (io == -1) {
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printk(KERN_ERR "You must set an I/O address with io=0x???\n");
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return -EINVAL;
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}
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if ((io != 0x20c) && (io != 0x30c)) {
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printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
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return -ENXIO;
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}
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video_set_drvdata(&zoltrix_radio, &zoltrix_unit);
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if (!request_region(io, 2, "zoltrix")) {
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printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
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return -EBUSY;
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}
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if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
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release_region(io, 2);
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return -EINVAL;
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}
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printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
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mutex_init(&zoltrix_unit.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, io);
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outb(0, io);
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msleep(20);
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inb(io + 3);
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zoltrix_unit.curvol = 0;
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zoltrix_unit.stereo = 1;
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return 0;
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}
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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_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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static void __exit zoltrix_cleanup_module(void)
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{
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video_unregister_device(&zoltrix_radio);
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release_region(io, 2);
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}
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module_init(zoltrix_init);
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module_exit(zoltrix_cleanup_module);
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