tveeprom.c

底层驱动开发

		/* process by tag */
		tag = eeprom_data[i];
		switch (tag) {
		case 0x00:
                        /* tag: 'Comprehensive' */
			tuner1 = eeprom_data[i+6];
			t_format1 = eeprom_data[i+5];
			tvee->has_radio = eeprom_data[i+len-1];
                        /* old style tag, don't know how to detect
                           IR presence, mark as unknown. */
			tvee->has_ir = 2;
			tvee->model =
				eeprom_data[i+8] +
				(eeprom_data[i+9] << 8);
			tvee->revision = eeprom_data[i+10] +
				(eeprom_data[i+11] << 8) +
				(eeprom_data[i+12] << 16);
			break;

		case 0x01:
                        /* tag: 'SerialID' */
			tvee->serial_number =
				eeprom_data[i+6] +
				(eeprom_data[i+7] << 8) +
				(eeprom_data[i+8] << 16);
			break;

		case 0x02:
                        /* tag 'AudioInfo'
                           Note mask with 0x7F, high bit used on some older models
                           to indicate 4052 mux was removed in favor of using MSP
                           inputs directly. */
			tvee->audio_processor = eeprom_data[i+2] & 0x7f;
			break;

                /* case 0x03: tag 'EEInfo' */

		case 0x04:
                        /* tag 'SerialID2' */
			tvee->serial_number =
				eeprom_data[i+5] +
				(eeprom_data[i+6] << 8) +
				(eeprom_data[i+7] << 16);
			break;

		case 0x05:
                        /* tag 'Audio2'
                           Note mask with 0x7F, high bit used on some older models
                           to indicate 4052 mux was removed in favor of using MSP
                           inputs directly. */
			tvee->audio_processor = eeprom_data[i+1] & 0x7f;
			break;

		case 0x06:
                        /* tag 'ModelRev' */
			tvee->model =
				eeprom_data[i+1] +
				(eeprom_data[i+2] << 8);
			tvee->revision = eeprom_data[i+5] +
				(eeprom_data[i+6] << 8) +
				(eeprom_data[i+7] << 16);
			break;

		case 0x07:
                        /* tag 'Details': according to Hauppauge not interesting
                           on any PCI-era or later boards. */
			break;

                /* there is no tag 0x08 defined */

		case 0x09:
                        /* tag 'Video' */
			tvee->decoder_processor = eeprom_data[i + 1];
			break;

		case 0x0a:
                        /* tag 'Tuner' */
			if (beenhere == 0) {
				tuner1 = eeprom_data[i+2];
				t_format1 = eeprom_data[i+1];
				beenhere = 1;
			} else {
                                /* a second (radio) tuner may be present */
				tuner2 = eeprom_data[i+2];
				t_format2 = eeprom_data[i+1];
                                if (t_format2 == 0) {  /* not a TV tuner? */
                                        tvee->has_radio = 1; /* must be radio */
                                }
                        }
			break;

                case 0x0b:
                        /* tag 'Inputs': according to Hauppauge this is specific
                           to each driver family, so no good assumptions can be
                           made. */
                        break;

                /* case 0x0c: tag 'Balun' */
                /* case 0x0d: tag 'Teletext' */

		case 0x0e:
                        /* tag: 'Radio' */
			tvee->has_radio = eeprom_data[i+1];
			break;

                case 0x0f:
                        /* tag 'IRInfo' */
                        tvee->has_ir = eeprom_data[i+1];
                        break;

                /* case 0x10: tag 'VBIInfo' */
                /* case 0x11: tag 'QCInfo' */
                /* case 0x12: tag 'InfoBits' */

		default:
			tveeprom_dbg("Not sure what to do with tag [%02x]\n", tag);
			/* dump the rest of the packet? */
		}
	}

	if (!done) {
		tveeprom_warn("Ran out of data!\n");
		return;
	}

	if (tvee->revision != 0) {
		tvee->rev_str[0] = 32 + ((tvee->revision >> 18) & 0x3f);
		tvee->rev_str[1] = 32 + ((tvee->revision >> 12) & 0x3f);
		tvee->rev_str[2] = 32 + ((tvee->revision >>  6) & 0x3f);
		tvee->rev_str[3] = 32 + ( tvee->revision        & 0x3f);
		tvee->rev_str[4] = 0;
	}

        if (hasRadioTuner(tuner1) && !tvee->has_radio) {
	    tveeprom_info("The eeprom says no radio is present, but the tuner type\n");
	    tveeprom_info("indicates otherwise. I will assume that radio is present.\n");
            tvee->has_radio = 1;
        }

	if (tuner1 < sizeof(hauppauge_tuner)/sizeof(struct HAUPPAUGE_TUNER)) {
		tvee->tuner_type = hauppauge_tuner[tuner1].id;
		t_name1 = hauppauge_tuner[tuner1].name;
	} else {
		t_name1 = "unknown";
	}

	if (tuner2 < sizeof(hauppauge_tuner)/sizeof(struct HAUPPAUGE_TUNER)) {
		tvee->tuner2_type = hauppauge_tuner[tuner2].id;
		t_name2 = hauppauge_tuner[tuner2].name;
	} else {
		t_name2 = "unknown";
	}

	tvee->tuner_formats = 0;
	tvee->tuner2_formats = 0;
	for (i = j = 0; i < 8; i++) {
		if (t_format1 & (1 << i)) {
			tvee->tuner_formats |= hauppauge_tuner_fmt[i].id;
			t_fmt_name1[j++] = hauppauge_tuner_fmt[i].name;
		}
                if (t_format2 & (1 << i)) {
                        tvee->tuner2_formats |= hauppauge_tuner_fmt[i].id;
                        t_fmt_name2[j++] = hauppauge_tuner_fmt[i].name;
                }
	}

	tveeprom_info("Hauppauge model %d, rev %s, serial# %d\n",
		   tvee->model, tvee->rev_str, tvee->serial_number);
	tveeprom_info("tuner model is %s (idx %d, type %d)\n",
		   t_name1, tuner1, tvee->tuner_type);
	tveeprom_info("TV standards%s%s%s%s%s%s%s%s (eeprom 0x%02x)\n",
		   t_fmt_name1[0], t_fmt_name1[1], t_fmt_name1[2], t_fmt_name1[3],
		   t_fmt_name1[4], t_fmt_name1[5], t_fmt_name1[6], t_fmt_name1[7],
                   t_format1);
        if (tuner2) {
                tveeprom_info("second tuner model is %s (idx %d, type %d)\n",
                           t_name2, tuner2, tvee->tuner2_type);
        }
        if (t_format2) {
                tveeprom_info("TV standards%s%s%s%s%s%s%s%s (eeprom 0x%02x)\n",
                           t_fmt_name2[0], t_fmt_name2[1], t_fmt_name2[2], t_fmt_name2[3],
                           t_fmt_name2[4], t_fmt_name2[5], t_fmt_name2[6], t_fmt_name2[7],
                           t_format2);
        }
	tveeprom_info("audio processor is %s (idx %d)\n",
		   STRM(audioIC, tvee->audio_processor),
		   tvee->audio_processor);
        if (tvee->decoder_processor) {
                tveeprom_info("decoder processor is %s (idx %d)\n",
                           STRM(decoderIC, tvee->decoder_processor),
                           tvee->decoder_processor);
        }
        if (tvee->has_ir == 2)
                tveeprom_info("has %sradio\n",
                                tvee->has_radio ? "" : "no ");
        else
                tveeprom_info("has %sradio, has %sIR remote\n",
                                tvee->has_radio ? "" : "no ",
                                tvee->has_ir ? "" : "no ");
}
EXPORT_SYMBOL(tveeprom_hauppauge_analog);

/* ----------------------------------------------------------------------- */
/* generic helper functions                                                */

int tveeprom_read(struct i2c_client *c, unsigned char *eedata, int len)
{
	unsigned char buf;
	int err;

	buf = 0;
	if (1 != (err = i2c_master_send(c, &buf, 1))) {
		tveeprom_info("Huh, no eeprom present (err=%d)?\n", err);
		return -1;
	}
	if (len != (err = i2c_master_recv(c, eedata, len))) {
		tveeprom_warn("i2c eeprom read error (err=%d)\n", err);
		return -1;
	}
        if (debug) {
                int i;

                tveeprom_info("full 256-byte eeprom dump:\n");
                for (i = 0; i < len; i++) {
                        if (0 == (i % 16))
                                tveeprom_info("%02x:", i);
                        printk(" %02x", eedata[i]);
                        if (15 == (i % 16))
                                printk("\n");
                }
        }
	return 0;
}
EXPORT_SYMBOL(tveeprom_read);

/* ----------------------------------------------------------------------- */
/* needed for ivtv.sf.net at the moment.  Should go away in the long       */
/* run, just call the exported tveeprom_* directly, there is no point in   */
/* using the indirect way via i2c_driver->command()                        */

#ifndef I2C_DRIVERID_TVEEPROM
# define I2C_DRIVERID_TVEEPROM I2C_DRIVERID_EXP2
#endif

static unsigned short normal_i2c[] = {
	0xa0 >> 1,
	I2C_CLIENT_END,
};

I2C_CLIENT_INSMOD;

static struct i2c_driver i2c_driver_tveeprom;

static int
tveeprom_command(struct i2c_client *client,
		 unsigned int       cmd,
		 void              *arg)
{
	struct tveeprom eeprom;
	u32 *eeprom_props = arg;
	u8 *buf;

	switch (cmd) {
	case 0:
		buf = kmalloc(256,GFP_KERNEL);
		memset(buf,0,256);
		tveeprom_read(client,buf,256);
		tveeprom_hauppauge_analog(client, &eeprom,buf);
		kfree(buf);
		eeprom_props[0] = eeprom.tuner_type;
		eeprom_props[1] = eeprom.tuner_formats;
		eeprom_props[2] = eeprom.model;
		eeprom_props[3] = eeprom.revision;
		eeprom_props[4] = eeprom.has_radio;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int
tveeprom_detect_client(struct i2c_adapter *adapter,
		       int                 address,
		       int                 kind)
{
	struct i2c_client *client;

	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (NULL == client)
		return -ENOMEM;
	memset(client, 0, sizeof(struct i2c_client));
	client->addr = address;
	client->adapter = adapter;
	client->driver = &i2c_driver_tveeprom;
	client->flags = I2C_CLIENT_ALLOW_USE;
	snprintf(client->name, sizeof(client->name), "tveeprom");
        i2c_attach_client(client);
	return 0;
}

static int
tveeprom_attach_adapter (struct i2c_adapter *adapter)
{
	if (adapter->id != I2C_HW_B_BT848)
		return 0;
	return i2c_probe(adapter, &addr_data, tveeprom_detect_client);
}

static int
tveeprom_detach_client (struct i2c_client *client)
{
	int err;

	err = i2c_detach_client(client);
	if (err < 0)
		return err;
	kfree(client);
	return 0;
}

static struct i2c_driver i2c_driver_tveeprom = {
	.owner          = THIS_MODULE,
	.name           = "tveeprom",
	.id             = I2C_DRIVERID_TVEEPROM,
	.flags          = I2C_DF_NOTIFY,
	.attach_adapter = tveeprom_attach_adapter,
	.detach_client  = tveeprom_detach_client,
	.command        = tveeprom_command,
};

static int __init tveeprom_init(void)
{
	return i2c_add_driver(&i2c_driver_tveeprom);
}

static void __exit tveeprom_exit(void)
{
	i2c_del_driver(&i2c_driver_tveeprom);
}

module_init(tveeprom_init);
module_exit(tveeprom_exit);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */