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path: root/drivers/media/video/tvmixer.c
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Diffstat (limited to 'drivers/media/video/tvmixer.c')
-rw-r--r--drivers/media/video/tvmixer.c367
1 files changed, 367 insertions, 0 deletions
diff --git a/drivers/media/video/tvmixer.c b/drivers/media/video/tvmixer.c
new file mode 100644
index 00000000000..eafd7061b31
--- /dev/null
+++ b/drivers/media/video/tvmixer.c
@@ -0,0 +1,367 @@
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/videodev.h>
+#include <linux/init.h>
+#include <linux/kdev_t.h>
+#include <linux/sound.h>
+#include <linux/soundcard.h>
+
+#include <asm/semaphore.h>
+#include <asm/uaccess.h>
+
+
+#define DEV_MAX 4
+
+static int devnr = -1;
+module_param(devnr, int, 0644);
+
+MODULE_AUTHOR("Gerd Knorr");
+MODULE_LICENSE("GPL");
+
+/* ----------------------------------------------------------------------- */
+
+struct TVMIXER {
+ struct i2c_client *dev;
+ int minor;
+ int count;
+};
+
+static struct TVMIXER devices[DEV_MAX];
+
+static int tvmixer_adapters(struct i2c_adapter *adap);
+static int tvmixer_clients(struct i2c_client *client);
+
+/* ----------------------------------------------------------------------- */
+
+static int mix_to_v4l(int i)
+{
+ int r;
+
+ r = ((i & 0xff) * 65536 + 50) / 100;
+ if (r > 65535) r = 65535;
+ if (r < 0) r = 0;
+ return r;
+}
+
+static int v4l_to_mix(int i)
+{
+ int r;
+
+ r = (i * 100 + 32768) / 65536;
+ if (r > 100) r = 100;
+ if (r < 0) r = 0;
+ return r | (r << 8);
+}
+
+static int v4l_to_mix2(int l, int r)
+{
+ r = (r * 100 + 32768) / 65536;
+ if (r > 100) r = 100;
+ if (r < 0) r = 0;
+ l = (l * 100 + 32768) / 65536;
+ if (l > 100) l = 100;
+ if (l < 0) l = 0;
+ return (r << 8) | l;
+}
+
+static int tvmixer_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct video_audio va;
+ int left,right,ret,val = 0;
+ struct TVMIXER *mix = file->private_data;
+ struct i2c_client *client = mix->dev;
+ void __user *argp = (void __user *)arg;
+ int __user *p = argp;
+
+ if (NULL == client)
+ return -ENODEV;
+
+ if (cmd == SOUND_MIXER_INFO) {
+ mixer_info info;
+ strlcpy(info.id, "tv card", sizeof(info.id));
+ strlcpy(info.name, i2c_clientname(client), sizeof(info.name));
+ info.modify_counter = 42 /* FIXME */;
+ if (copy_to_user(argp, &info, sizeof(info)))
+ return -EFAULT;
+ return 0;
+ }
+ if (cmd == SOUND_OLD_MIXER_INFO) {
+ _old_mixer_info info;
+ strlcpy(info.id, "tv card", sizeof(info.id));
+ strlcpy(info.name, i2c_clientname(client), sizeof(info.name));
+ if (copy_to_user(argp, &info, sizeof(info)))
+ return -EFAULT;
+ return 0;
+ }
+ if (cmd == OSS_GETVERSION)
+ return put_user(SOUND_VERSION, p);
+
+ if (_SIOC_DIR(cmd) & _SIOC_WRITE)
+ if (get_user(val, p))
+ return -EFAULT;
+
+ /* read state */
+ memset(&va,0,sizeof(va));
+ client->driver->command(client,VIDIOCGAUDIO,&va);
+
+ switch (cmd) {
+ case MIXER_READ(SOUND_MIXER_RECMASK):
+ case MIXER_READ(SOUND_MIXER_CAPS):
+ case MIXER_READ(SOUND_MIXER_RECSRC):
+ case MIXER_WRITE(SOUND_MIXER_RECSRC):
+ ret = 0;
+ break;
+
+ case MIXER_READ(SOUND_MIXER_STEREODEVS):
+ ret = SOUND_MASK_VOLUME;
+ break;
+ case MIXER_READ(SOUND_MIXER_DEVMASK):
+ ret = SOUND_MASK_VOLUME;
+ if (va.flags & VIDEO_AUDIO_BASS)
+ ret |= SOUND_MASK_BASS;
+ if (va.flags & VIDEO_AUDIO_TREBLE)
+ ret |= SOUND_MASK_TREBLE;
+ break;
+
+ case MIXER_WRITE(SOUND_MIXER_VOLUME):
+ left = mix_to_v4l(val);
+ right = mix_to_v4l(val >> 8);
+ va.volume = max(left,right);
+ va.balance = (32768*min(left,right)) / (va.volume ? va.volume : 1);
+ va.balance = (left<right) ? (65535-va.balance) : va.balance;
+ if (va.volume)
+ va.flags &= ~VIDEO_AUDIO_MUTE;
+ client->driver->command(client,VIDIOCSAUDIO,&va);
+ client->driver->command(client,VIDIOCGAUDIO,&va);
+ /* fall throuth */
+ case MIXER_READ(SOUND_MIXER_VOLUME):
+ left = (min(65536 - va.balance,32768) *
+ va.volume) / 32768;
+ right = (min(va.balance,(u16)32768) *
+ va.volume) / 32768;
+ ret = v4l_to_mix2(left,right);
+ break;
+
+ case MIXER_WRITE(SOUND_MIXER_BASS):
+ va.bass = mix_to_v4l(val);
+ client->driver->command(client,VIDIOCSAUDIO,&va);
+ client->driver->command(client,VIDIOCGAUDIO,&va);
+ /* fall throuth */
+ case MIXER_READ(SOUND_MIXER_BASS):
+ ret = v4l_to_mix(va.bass);
+ break;
+
+ case MIXER_WRITE(SOUND_MIXER_TREBLE):
+ va.treble = mix_to_v4l(val);
+ client->driver->command(client,VIDIOCSAUDIO,&va);
+ client->driver->command(client,VIDIOCGAUDIO,&va);
+ /* fall throuth */
+ case MIXER_READ(SOUND_MIXER_TREBLE):
+ ret = v4l_to_mix(va.treble);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+ if (put_user(ret, p))
+ return -EFAULT;
+ return 0;
+}
+
+static int tvmixer_open(struct inode *inode, struct file *file)
+{
+ int i, minor = iminor(inode);
+ struct TVMIXER *mix = NULL;
+ struct i2c_client *client = NULL;
+
+ for (i = 0; i < DEV_MAX; i++) {
+ if (devices[i].minor == minor) {
+ mix = devices+i;
+ client = mix->dev;
+ break;
+ }
+ }
+
+ if (NULL == client)
+ return -ENODEV;
+
+ /* lock bttv in memory while the mixer is in use */
+ file->private_data = mix;
+#ifndef I2C_PEC
+ if (client->adapter->inc_use)
+ client->adapter->inc_use(client->adapter);
+#endif
+ if (client->adapter->owner)
+ try_module_get(client->adapter->owner);
+ return 0;
+}
+
+static int tvmixer_release(struct inode *inode, struct file *file)
+{
+ struct TVMIXER *mix = file->private_data;
+ struct i2c_client *client;
+
+ client = mix->dev;
+ if (NULL == client) {
+ return -ENODEV;
+ }
+
+#ifndef I2C_PEC
+ if (client->adapter->dec_use)
+ client->adapter->dec_use(client->adapter);
+#endif
+ if (client->adapter->owner)
+ module_put(client->adapter->owner);
+ return 0;
+}
+
+static struct i2c_driver driver = {
+#ifdef I2C_PEC
+ .owner = THIS_MODULE,
+#endif
+ .name = "tv card mixer driver",
+ .id = I2C_DRIVERID_TVMIXER,
+#ifdef I2C_DF_DUMMY
+ .flags = I2C_DF_DUMMY,
+#else
+ .flags = I2C_DF_NOTIFY,
+ .detach_adapter = tvmixer_adapters,
+#endif
+ .attach_adapter = tvmixer_adapters,
+ .detach_client = tvmixer_clients,
+};
+
+static struct file_operations tvmixer_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .ioctl = tvmixer_ioctl,
+ .open = tvmixer_open,
+ .release = tvmixer_release,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static int tvmixer_adapters(struct i2c_adapter *adap)
+{
+ struct list_head *item;
+ struct i2c_client *client;
+
+ list_for_each(item,&adap->clients) {
+ client = list_entry(item, struct i2c_client, list);
+ tvmixer_clients(client);
+ }
+ return 0;
+}
+
+static int tvmixer_clients(struct i2c_client *client)
+{
+ struct video_audio va;
+ int i,minor;
+
+#ifdef I2C_CLASS_TV_ANALOG
+ if (!(client->adapter->class & I2C_CLASS_TV_ANALOG))
+ return -1;
+#else
+ /* TV card ??? */
+ switch (client->adapter->id) {
+ case I2C_ALGO_BIT | I2C_HW_SMBUS_VOODOO3:
+ case I2C_ALGO_BIT | I2C_HW_B_BT848:
+ case I2C_ALGO_BIT | I2C_HW_B_RIVA:
+ /* ok, have a look ... */
+ break;
+ default:
+ /* ignore that one */
+ return -1;
+ }
+#endif
+
+ /* unregister ?? */
+ for (i = 0; i < DEV_MAX; i++) {
+ if (devices[i].dev == client) {
+ /* unregister */
+ unregister_sound_mixer(devices[i].minor);
+ devices[i].dev = NULL;
+ devices[i].minor = -1;
+ printk("tvmixer: %s unregistered (#1)\n",
+ i2c_clientname(client));
+ return 0;
+ }
+ }
+
+ /* look for a free slot */
+ for (i = 0; i < DEV_MAX; i++)
+ if (NULL == devices[i].dev)
+ break;
+ if (i == DEV_MAX) {
+ printk(KERN_WARNING "tvmixer: DEV_MAX too small\n");
+ return -1;
+ }
+
+ /* audio chip with mixer ??? */
+ if (NULL == client->driver->command)
+ return -1;
+ memset(&va,0,sizeof(va));
+ if (0 != client->driver->command(client,VIDIOCGAUDIO,&va))
+ return -1;
+ if (0 == (va.flags & VIDEO_AUDIO_VOLUME))
+ return -1;
+
+ /* everything is fine, register */
+ if ((minor = register_sound_mixer(&tvmixer_fops,devnr)) < 0) {
+ printk(KERN_ERR "tvmixer: cannot allocate mixer device\n");
+ return -1;
+ }
+
+ devices[i].minor = minor;
+ devices[i].count = 0;
+ devices[i].dev = client;
+ printk("tvmixer: %s (%s) registered with minor %d\n",
+ client->name,client->adapter->name,minor);
+
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static int __init tvmixer_init_module(void)
+{
+ int i;
+
+ for (i = 0; i < DEV_MAX; i++)
+ devices[i].minor = -1;
+
+ return i2c_add_driver(&driver);
+}
+
+static void __exit tvmixer_cleanup_module(void)
+{
+ int i;
+
+ i2c_del_driver(&driver);
+ for (i = 0; i < DEV_MAX; i++) {
+ if (devices[i].minor != -1) {
+ unregister_sound_mixer(devices[i].minor);
+ printk("tvmixer: %s unregistered (#2)\n",
+ i2c_clientname(devices[i].dev));
+ }
+ }
+}
+
+module_init(tvmixer_init_module);
+module_exit(tvmixer_cleanup_module);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 08:18:42 +0000