patch-2.3.99-pre9 linux/drivers/char/tda7432.c

• Lines: 506
• Date: Mon May 15 12:06:25 2000
• Orig file: v2.3.99-pre8/linux/drivers/char/tda7432.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre8/linux/drivers/char/tda7432.c linux/drivers/char/tda7432.c
@@ -0,0 +1,505 @@
+/*
+ * For the STS-Thompson TDA7432 audio processor chip
+ * 
+ * Handles audio functions: volume, balance, tone, loudness
+ * This driver will not complain if used with any 
+ * other i2c device with the same address.
+ *
+ * Copyright (c) 2000 Eric Sandeen <eric_sandeen@bigfoot.com>
+ * This code is placed under the terms of the GNU General Public License
+ * Based on tda9855.c by Steve VanDeBogart (vandebo@uclink.berkeley.edu)
+ * Which was based on tda8425.c by Greg Alexander (c) 1998
+ *
+ * OPTIONS:
+ * debug    - set to 1 if you'd like to see debug messages
+ *            set to 2 if you'd like to be inundated with debug messages
+ *
+ * loudness - set between 0 and 15 for varying degrees of loudness effect
+ *
+ * TODO:
+ *  Implement tone controls
+ *
+ *  Revision: 0.3 - Fixed silly reversed volume controls.  :)
+ *  Revision: 0.2 - Cleaned up #defines
+ *			fixed volume control
+ *                  Added I2C_DRIVERID_TDA7432
+ *			added loudness insmod control
+ *  Revision: 0.1 - initial version
+ */
+
+#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"
+
+/* This driver ID is brand new, so define it if it's not in i2c-id.h yet */
+#ifndef I2C_DRIVERID_TDA7432
+  #define I2C_DRIVERID_TDA7432	27
+#endif
+
+
+MODULE_AUTHOR("Eric Sandeen <eric_sandeen@bigfoot.com>");
+MODULE_DESCRIPTION("bttv driver for the tda7432 audio processor chip");
+
+MODULE_PARM(debug,"i");
+MODULE_PARM(loudness,"i");
+static int loudness = 0; /* disable loudness by default */
+static int debug = 0;	 /* insmod parameter */
+
+
+/* Address to scan (I2C address of this chip) */
+static unsigned short normal_i2c[] = {
+	I2C_TDA7432 >> 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
+};
+
+/* Structure of address and subaddresses for the tda7432 */
+
+struct tda7432 {
+	int addr;
+	int input;
+	int volume;
+	int tone;
+	int lf, lr, rf, rr;
+	int loud;
+};
+
+static struct i2c_driver driver;
+static struct i2c_client client_template;
+
+#define dprintk  if (debug) printk
+#define d2printk if (debug > 1) printk
+
+/* The TDA7432 is made by STS-Thompson
+ * http://www.st.com
+ * http://us.st.com/stonline/books/pdf/docs/4056.pdf
+ *
+ * TDA7432: I2C-bus controlled basic audio processor
+ *
+ * The TDA7432 controls basic audio functions like volume, balance,
+ * and tone control (including loudness).  It also has four channel
+ * output (for front and rear).  Since most vidcap cards probably
+ * don't have 4 channel output, this driver will set front & rear
+ * together (no independent control).
+ */ 
+
+		/* Subaddresses for TDA7432 */
+
+#define TDA7432_IN	0x00 /* Input select                 */
+#define TDA7432_VL	0x01 /* Volume                       */
+#define TDA7432_TN	0x02 /* Bass, Treble (Tone)          */
+#define TDA7432_LF	0x03 /* Attenuation LF (Left Front)  */
+#define TDA7432_LR	0x04 /* Attenuation LR (Left Rear)   */
+#define TDA7432_RF	0x05 /* Attenuation RF (Right Front) */
+#define TDA7432_RR	0x06 /* Attenuation RR (Right Rear)  */
+#define TDA7432_LD	0x07 /* Loudness                     */
+
+
+		/* Masks for bits in TDA7432 subaddresses */
+
+/* Many of these not used - just for documentation */
+
+/* Subaddress 0x00 - Input selection and bass control */
+
+/* Bits 0,1,2 control input:
+ * 0x00 - Stereo input
+ * 0x02 - Mono input
+ * 0x03 - Mute
+ * Mono probably isn't used - I'm guessing only the stereo
+ * input is connected on most cards, so we'll set it to stereo.
+ * 
+ * Bit 3 controls bass cut: 0/1 is non-symmetric/symmetric bass cut
+ * Bit 4 controls bass range: 0/1 is extended/standard bass range
+ * 
+ * Highest 3 bits not used
+ */
+ 
+#define TDA7432_STEREO_IN	0
+#define TDA7432_MONO_IN		2	/* Probably won't be used */
+#define TDA7432_MUTE		3	/* Probably won't be used */
+#define TDA7432_BASS_SYM	1 << 3
+#define TDA7432_BASS_NORM	1 << 4
+
+/* Subaddress 0x01 - Volume */
+
+/* Lower 7 bits control volume from -79dB to +32dB in 1dB steps
+ * Recommended maximum is +20 dB
+ *
+ * +32dB: 0x00
+ * +20dB: 0x0c
+ *   0dB: 0x20
+ * -79dB: 0x6f
+ *
+ * MSB (bit 7) controls loudness: 1/0 is loudness on/off
+ */
+
+#define	TDA7432_VOL_0DB		0x20
+#define TDA7432_LD_ON		1 << 7
+
+
+/* Subaddress 0x02 - Tone control */ 
+
+/* Bits 0,1,2 control absolute treble gain from 0dB to 14dB
+ * 0x0 is 14dB, 0x7 is 0dB
+ *
+ * Bit 3 controls treble attenuation/gain (sign)
+ * 1 = gain (+)
+ * 0 = attenuation (-)
+ *
+ * Bits 4,5,6 control absolute bass gain from 0dB to 14dB
+ * (This is only true for normal base range, set in 0x00)
+ * 0x0 << 4 is 14dB, 0x7 is 0dB
+ * 
+ * Bit 7 controls bass attenuation/gain (sign)
+ * 1 << 7 = gain (+)
+ * 0 << 7 = attenuation (-) 
+ *
+ * Example:
+ * 1 1 0 1 0 1 0 1 is +4dB bass, -4dB treble
+ */
+
+#define TDA7432_TREBLE_0DB		0xf 
+#define TDA7432_TREBLE			7
+#define TDA7432_TREBLE_GAIN		1 << 3
+#define TDA7432_BASS_0DB		0xf << 4
+#define TDA7432_BASS			7 << 4
+#define TDA7432_BASS_GAIN		1 << 7
+
+ 
+/* Subaddress 0x03 - Left  Front attenuation */
+/* Subaddress 0x04 - Left  Rear  attenuation */
+/* Subaddress 0x05 - Right Front attenuation */
+/* Subaddress 0x06 - Right Rear  attenuation */
+
+/* Bits 0,1,2,3,4 control attenuation from 0dB to -37.5dB
+ * in 1.5dB steps.
+ *
+ * 0x00 is     0dB
+ * 0x1f is -37.5dB
+ *
+ * Bit 5 mutes that channel when set (1 = mute, 0 = unmute)
+ * We'll use the mute on the input, though (above) 
+ * Bits 6,7 unused
+ */
+
+#define TDA7432_ATTEN_0DB	0x00
+
+
+/* Subaddress 0x07 - Loudness Control */
+
+/* Bits 0,1,2,3 control loudness from 0dB to -15dB in 1dB steps
+ * when bit 4 is NOT set
+ *
+ * 0x0 is   0dB
+ * 0xf is -15dB
+ *
+ * If bit 4 is set, then there is a flat attenuation according to
+ * the lower 4 bits, as above.
+ *
+ * Bits 5,6,7 unused
+ */
+ 
+ 
+
+/* Begin code */
+
+static int tda7432_write(struct i2c_client *client, int subaddr, int val)
+{
+	unsigned char buffer[2];
+	d2printk("tda7432: In tda7432_write\n");
+	dprintk("tda7432: Writing %d 0x%x\n", subaddr, val);
+	buffer[0] = subaddr;
+	buffer[1] = val;
+	if (2 != i2c_master_send(client,buffer,2)) {
+		printk(KERN_WARNING "tda7432: I/O error, trying (write %d 0x%x)\n",
+		       subaddr, val);
+		return -1;
+	}
+	return 0;
+}
+
+/* I don't think we ever actually _read_ the chip... */
+#if 0
+static int tda7432_read(struct i2c_client *client)
+{
+	unsigned char buffer;
+	d2printk("tda7432: In tda7432_read\n");
+	if (1 != i2c_master_recv(client,&buffer,1)) {
+		printk(KERN_WARNING "tda7432: I/O error, trying (read)\n");
+		return -1;
+	}
+	dprintk("tda7432: Read 0x%02x\n", buffer); 
+	return buffer;
+}
+#endif
+
+static int tda7432_set(struct i2c_client *client)
+{
+	struct tda7432 *t = client->data;
+	unsigned char buf[16];
+	d2printk("tda7432: In tda7432_set\n");
+	
+	dprintk(KERN_INFO 
+		"tda7432: 7432_set(0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x,0x%02x)\n",
+		t->input,t->volume,t->tone,t->lf,t->lr,t->rf,t->rr,t->loud);
+	buf[0]  = TDA7432_IN;
+	buf[1]  = t->input;
+	buf[2]  = t->volume;
+	buf[3]  = t->tone;
+	buf[4]  = t->lf;
+	buf[5]  = t->lr;
+	buf[6]  = t->rf;
+	buf[7]  = t->rr;
+	buf[8]  = t->loud;
+	if (9 != i2c_master_send(client,buf,9)) {
+		printk(KERN_WARNING "tda7432: I/O error, trying tda7432_set\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static void do_tda7432_init(struct i2c_client *client)
+{
+	struct tda7432 *t = client->data;
+	d2printk("tda7432: In tda7432_init\n");
+
+	t->input  = TDA7432_STEREO_IN |  /* Main (stereo) input   */
+		    TDA7432_BASS_SYM  |  /* Symmetric bass cut    */
+		    TDA7432_BASS_NORM;   /* Normal bass range     */ 
+	t->volume = TDA7432_VOL_0DB;	 /* 0dB Volume            */
+	if (loudness)			 /* Turn loudness on?     */
+		t->volume |= TDA7432_LD_ON;	
+	t->tone   = TDA7432_TREBLE_0DB | /* 0dB Treble            */
+		    TDA7432_BASS_0DB; 	 /* 0dB Bass              */
+	t->lf     = TDA7432_ATTEN_0DB;	 /* 0dB attenuation       */
+	t->lr     = TDA7432_ATTEN_0DB;	 /* 0dB attenuation       */
+	t->rf     = TDA7432_ATTEN_0DB;	 /* 0dB attenuation       */
+	t->rr     = TDA7432_ATTEN_0DB;	 /* 0dB attenuation       */
+	t->loud   = loudness;		 /* insmod parameter      */
+
+	tda7432_set(client);
+}
+
+/* *********************** *
+ * i2c interface functions *
+ * *********************** */
+
+static int tda7432_attach(struct i2c_adapter *adap, int addr,
+			  unsigned short flags, int kind)
+{
+	struct tda7432 *t;
+	struct i2c_client *client;
+	d2printk("tda7432: In tda7432_attach\n");
+	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 = t = kmalloc(sizeof *t,GFP_KERNEL);
+	if (!t)
+		return -ENOMEM;
+	memset(t,0,sizeof *t);
+	do_tda7432_init(client);
+	MOD_INC_USE_COUNT;
+	strcpy(client->name,"TDA7432");
+	printk(KERN_INFO "tda7432: init\n");
+
+	i2c_attach_client(client);
+	return 0;
+}
+
+static int tda7432_probe(struct i2c_adapter *adap)
+{
+	if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
+		return i2c_probe(adap, &addr_data, tda7432_attach);
+	return 0;
+}
+
+static int tda7432_detach(struct i2c_client *client)
+{
+	struct tda7432 *t  = client->data;
+
+	do_tda7432_init(client);
+	i2c_detach_client(client);
+	
+	kfree(t);
+	kfree(client);
+	MOD_DEC_USE_COUNT;
+	return 0;
+}
+
+static int tda7432_command(struct i2c_client *client,
+			   unsigned int cmd, void *arg)
+{
+	struct tda7432 *t = client->data;
+	d2printk("tda7432: In tda7432_command\n");
+#if 0
+	__u16 *sarg = arg;
+#endif
+
+	switch (cmd) {
+	/* --- v4l ioctls --- */
+	/* take care: bttv does userspace copying, we'll get a
+	   kernel pointer here... */
+	
+	/* Query card - scale from TDA7432 settings to V4L settings */
+	case VIDIOCGAUDIO:
+	{
+		struct video_audio *va = arg;
+		dprintk("tda7432: VIDIOCGAUDIO\n");
+
+		va->flags |= VIDEO_AUDIO_VOLUME |
+			VIDEO_AUDIO_BASS |
+			VIDEO_AUDIO_TREBLE;
+
+		/* Master volume control
+		 * V4L volume is min 0, max 65535
+		 * TDA7432 Volume: 
+		 * Min (-79dB) is 0x6f
+		 * Max (+20dB) is 0x07
+		 * (Mask out bit 7 of vol - it's for the loudness setting)
+		 */
+
+		va->volume = ( 0x6f - (t->volume & 0x7F) ) * 630;
+		
+		/* Balance depends on L,R attenuation
+		 * V4L balance is 0 to 65535, middle is 32768
+		 * TDA7432 attenuation: min (0dB) is 0, max (-37.5dB) is 0x1f
+		 * to scale up to V4L numbers, mult by 1057
+		 * attenuation exists for lf, lr, rf, rr
+		 * we use only lf and rf (front channels)
+		 */
+		 
+		if ( (t->lf) < (t->rf) )
+			/* right is attenuated, balance shifted left */
+			va->balance = (32768 - 1057*(t->rf));
+		else
+			/* left is attenuated, balance shifted right */
+			va->balance = (32768 + 1057*(t->lf));
+
+		/* Bass/treble */
+		va->bass = 32768;   /* brain hurts... set to middle for now */
+		va->treble = 32768; /* brain hurts... set to middle for now */
+		
+		break; /* VIDIOCGAUDIO case */
+	}
+
+	/* Set card - scale from V4L settings to TDA7432 settings */
+	case VIDIOCSAUDIO:
+	{
+		struct video_audio *va = arg;
+		dprintk("tda7432: VIDEOCSAUDIO\n");
+
+		t->volume = 0x6f - ( (va->volume)/630 );
+		
+		if (loudness)		/* Turn on the loudness bit */
+			t->volume |= TDA7432_LD_ON;
+		
+		if (va->balance < 32768) {
+			/* shifted to left, attenuate right */
+			t->rr = (32768 - va->balance)/1057;
+			t->rf = t->rr;
+		}
+		else {
+			/* shifted to right, attenuate left */
+			t->lf = (va->balance - 32768)/1057;
+			t->lr = t->lf;
+		}
+		
+		/* t->tone = 0xff; */ /* Brain hurts - no tone control for now... */
+
+		tda7432_write(client,TDA7432_VL, t->volume);
+		/* tda7432_write(client,TDA7432_TN, t->tone); */
+		tda7432_write(client,TDA7432_LF, t->lf);
+		tda7432_write(client,TDA7432_LR, t->lr);
+		tda7432_write(client,TDA7432_RF, t->rf);
+		tda7432_write(client,TDA7432_RR, t->rr);
+
+		break;
+
+	} /* end of VIDEOCSAUDIO case */
+
+	default: /* Not VIDEOCGAUDIO or VIDEOCSAUDIO */
+
+		/* nothing */
+		d2printk("tda7432: Default\n");
+
+	} /* end of (cmd) switch */
+
+	return 0;
+}
+
+
+static struct i2c_driver driver = {
+        "i2c tda7432 driver",
+	I2C_DRIVERID_TDA7432,
+        I2C_DF_NOTIFY,
+	tda7432_probe,
+        tda7432_detach,
+        tda7432_command,
+};
+
+static struct i2c_client client_template =
+{
+        "(unset)",		/* name */
+        -1,
+        0,
+        0,
+        NULL,
+        &driver
+};
+
+#ifdef MODULE
+int init_module(void)
+#else
+int tda7432_init(void)
+#endif
+{
+
+	if ( (loudness < 0) || (loudness > 15) )
+	{
+		printk(KERN_ERR "tda7432: loudness parameter must be between 0 and 15\n");
+		return -EINVAL;
+	}
+
+
+	i2c_add_driver(&driver);
+	return 0;
+}
+
+#ifdef MODULE
+void cleanup_module(void)
+{
+	i2c_del_driver(&driver);
+}
+#endif
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */