patch-2.3.34 linux/drivers/char/tda8425.c

• Lines: 326
• Date: Thu Dec 16 13:59:38 1999
• Orig file: v2.3.33/linux/drivers/char/tda8425.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.33/linux/drivers/char/tda8425.c linux/drivers/char/tda8425.c
@@ -0,0 +1,325 @@
+/*
+ * for the TDA8425 chip (I don't know which cards have this)
+ * WARNING: THIS DRIVER WILL LOAD WITHOUT COMPLAINTS EVEN IF A DIFFERENT
+ * CHIP IS AT ADDRESS 0x82 (it relies on i2c to make sure that there is a
+ * device acknowledging that address)
+ *
+ * Copyright (c) 1998 Greg Alexander <galexand@acm.org>
+ * This code is placed under the terms of the GNU General Public License
+ * Code liberally copied from msp3400.c, which is by Gerd Knorr
+ *
+ * All of this should work, though it would be nice to eventually support
+ * balance (different left,right values).  Also, the chip seems (?) to have
+ * two stereo inputs, so if someone has this card, could they tell me if the
+ * second one can be used for anything (i.e., does it have an external input
+ * that you can't hear even if you set input to composite?)
+ */
+
+#include <linux/module.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/malloc.h>
+#include <linux/videodev.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#include "bttv.h"
+#include "audiochip.h"
+
+/* Addresses to scan */
+#define I2C_TDA8425        0x82
+static unsigned short normal_i2c[] = {
+    I2C_TDA8425 >> 1,
+    I2C_CLIENT_END};
+static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
+static unsigned short probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short probe_range[2]  = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
+static unsigned short force[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
+static struct i2c_client_address_data addr_data = {
+	normal_i2c, normal_i2c_range, 
+	probe, probe_range, 
+	ignore, ignore_range, 
+	force
+};
+
+MODULE_PARM(debug,"i");
+static int debug = 0; /* insmod parameter */
+#define dprintk  if (debug) printk
+
+
+struct tda8425 {
+	int mode;		/* set to AUDIO_{OFF,TUNER,RADIO,EXTERN} */
+	int stereo;
+	__u16 left,right;
+	__u16 bass,treble;
+};
+
+static struct i2c_driver driver;
+static struct i2c_client client_template;
+
+
+#define TDA8425_VL         0x00  /* volume left */
+#define TDA8425_VR         0x01  /* volume right */
+#define TDA8425_BA         0x02  /* bass */
+#define TDA8425_TR         0x03  /* treble */
+#define TDA8425_S1         0x08  /* switch functions */
+                                 /* values for those registers: */
+#define TDA8425_S1_OFF     0xEE  /* audio off (mute on) */
+#define TDA8425_S1_ON      0xCE  /* audio on (mute off) - "linear stereo" mode */
+
+
+/* ******************************** *
+ * functions for talking to TDA8425 *
+ * ******************************** */
+
+static int tda8425_write(struct i2c_client *client, int addr, int val)
+{
+	unsigned char buffer[2];
+	
+	buffer[0] = addr;
+	buffer[1] = val;
+	if (2 != i2c_master_send(client,buffer,2)) {
+		printk(KERN_WARNING "tda8425: I/O error, trying (write %d 0x%x)\n",
+		       addr, val);
+		return -1;
+	}
+	return 0;
+}
+
+static void tda8425_set(struct i2c_client *client)
+{
+	struct tda8425 *tda = client->data;
+
+	/* mode is ignored today */
+	dprintk(KERN_DEBUG "tda8425_set(%04x,%04x,%04x,%04x)\n",tda->left>>10,tda->right>>10,tda->bass>>12,tda->treble>>12);
+	tda8425_write(client, TDA8425_VL, tda->left>>10  |0xC0);
+	tda8425_write(client, TDA8425_VR, tda->right>>10 |0xC0);
+	tda8425_write(client, TDA8425_BA, tda->bass>>12  |0xF0);
+	tda8425_write(client, TDA8425_TR, tda->treble>>12|0xF0);
+}
+
+static void tda8425_init(struct i2c_client *client)
+{
+	struct tda8425 *tda = client->data;
+
+	tda->left=tda->right =61440;  /* 0dB */
+	tda->bass=tda->treble=24576;  /* 0dB */
+	tda->mode=AUDIO_OFF;
+	tda->stereo=1;
+	/* left=right=0x27<<10, bass=treble=0x07<<12 */
+	tda8425_write(client, TDA8425_S1, TDA8425_S1_OFF); /* mute */
+	tda8425_set(client);
+}
+
+static void tda8425_audio(struct i2c_client *client, int mode)
+{
+	struct tda8425 *tda = client->data;
+
+	/* valid for AUDIO_TUNER, RADIO, EXTERN, OFF */
+	dprintk(KERN_DEBUG "tda8425_audio:%d (T,R,E,I,O)\n",mode);
+	tda->mode=mode;
+	tda8425_write(client, TDA8425_S1,
+	              (mode==AUDIO_OFF)?TDA8425_S1_OFF:TDA8425_S1_ON);
+	/* this is the function we'll need to change if it turns out the
+	 * input-selecting capabilities should be used. */
+}
+
+
+/* *********************** *
+ * i2c interface functions *
+ * *********************** */
+
+static int tda8425_attach(struct i2c_adapter *adap, int addr,
+			  unsigned short flags, int kind)
+{
+	struct tda8425 *tda;
+	struct i2c_client *client;
+
+	client = kmalloc(sizeof *client,GFP_KERNEL);
+	if (!client)
+		return -ENOMEM;		
+        memcpy(client,&client_template,sizeof(struct i2c_client));
+        client->adapter = adap;
+        client->addr = addr;
+
+	client->data = tda = kmalloc(sizeof *tda,GFP_KERNEL);
+	if (!tda)
+		return -ENOMEM;
+	memset(tda,0,sizeof *tda);
+	tda8425_init(client);
+	MOD_INC_USE_COUNT;
+	strcpy(client->name,"TDA8425");
+	printk(KERN_INFO "tda8425: init\n");
+
+	i2c_attach_client(client);
+	return 0;
+}
+
+static int tda8425_probe(struct i2c_adapter *adap)
+{	
+	if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
+		return i2c_probe(adap, &addr_data, tda8425_attach);
+	return 0;
+}
+
+
+static int tda8425_detach(struct i2c_client *client)
+{
+	struct tda8425 *tda  = client->data;
+    
+	tda8425_init(client);
+	i2c_detach_client(client);
+
+	kfree(tda);
+	kfree(client);
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static int tda8425_command(struct i2c_client *client,
+			   unsigned int cmd, void *arg)
+{
+	struct tda8425 *tda = client->data;
+        __u16 *sarg = arg;
+
+	switch (cmd) {
+	case AUDC_SET_RADIO:
+		tda8425_audio(client,AUDIO_RADIO);
+		break;
+	case AUDC_SET_INPUT:
+		tda8425_audio(client,*sarg);
+		break;
+
+	/* --- v4l ioctls --- */
+	/* take care: bttv does userspace copying, we'll get a
+	   kernel pointer here... */
+	case VIDIOCGAUDIO:
+	{
+		struct video_audio *va = arg;
+
+		va->flags |= VIDEO_AUDIO_VOLUME |
+			VIDEO_AUDIO_BASS |
+			VIDEO_AUDIO_TREBLE;
+		va->volume=MAX(tda->left,tda->right);
+		va->balance=(32768*MIN(tda->left,tda->right))/
+			(va->volume ? va->volume : 1);
+		va->balance=(tda->left<tda->right)?
+			(65535-va->balance) : va->balance;
+		va->bass = tda->bass;
+		va->treble = tda->treble;
+		break;
+	}
+	case VIDIOCSAUDIO:
+	{
+		struct video_audio *va = arg;
+
+		tda->left = (MIN(65536 - va->balance,32768) *
+			     va->volume) / 32768;
+		tda->right = (MIN(va->balance,32768) *
+			      va->volume) / 32768;
+		tda->bass = va->bass;
+		tda->treble = va->treble;
+		tda8425_set(client);
+		break;
+	}
+
+#if 0
+	/* --- old, obsolete interface --- */
+	case AUDC_GET_VOLUME_LEFT:
+		*sarg = tda->left;
+		break;
+	case AUDC_GET_VOLUME_RIGHT:
+		*sarg = tda->right;
+		break;
+	case AUDC_SET_VOLUME_LEFT:
+		tda->left = *sarg;
+		tda8425_set(client);
+		break;
+	case AUDC_SET_VOLUME_RIGHT:
+		tda->right = *sarg;
+		tda8425_set(client);
+		break;
+
+	case AUDC_GET_BASS:
+		*sarg = tda->bass;
+		break;
+	case AUDC_SET_BASS:
+		tda->bass = *sarg;
+		tda8425_set(client);
+		break;
+
+	case AUDC_GET_TREBLE:
+		*sarg = tda->treble;
+		break;
+	case AUDC_SET_TREBLE:
+		tda->treble = *sarg;
+		tda8425_set(client);
+		break;
+
+	case AUDC_GET_STEREO:
+		*sarg = tda->stereo?VIDEO_SOUND_STEREO:VIDEO_SOUND_MONO;
+		break;
+	case AUDC_SET_STEREO:
+		tda->stereo=(*sarg==VIDEO_SOUND_MONO)?0:1;
+		/* TODO: make this write to the TDA9850? */
+		break;
+
+/*	case AUDC_SWITCH_MUTE:	someday, maybe -- not a lot of point to
+	case AUDC_NEWCHANNEL:	it and it would require preserving state
+	case AUDC_GET_DC:	huh?? (not used by bttv.c)
+*/
+#endif
+	default:
+		/* nothing */
+	}
+	return 0;
+}
+
+
+static struct i2c_driver driver = {
+        "i2c tda8424 driver",
+        I2C_DRIVERID_TDA8425,
+        I2C_DF_NOTIFY,
+	tda8425_probe,
+        tda8425_detach,
+        tda8425_command,
+};
+
+static struct i2c_client client_template =
+{
+        "(unset)",		/* name */
+        -1,
+        0,
+        0,
+        NULL,
+        &driver
+};
+
+#ifdef MODULE
+int init_module(void)
+#else
+int tda8425_init(void)
+#endif
+{
+	i2c_add_driver(&driver);
+	return 0;
+}
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+	i2c_del_driver(&driver);
+}
+#endif
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */