[net-next-2.6.git] / drivers / media / video / usbvision / usbvision-i2c.c

/*
 * I2C_ALGO_USB.C
 *  i2c algorithm for USB-I2C Bridges
 *
 * Copyright (c) 1999-2005 Joerg Heckenbach <joerg@heckenbach-aw.de>
 *                         Dwaine Garden <dwainegarden@rogers.com>
 *
 * This module is part of usbvision driver project.
 * Updates to driver completed by Dwaine P. Garden
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/version.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include "usbvision.h"

#define DBG_I2C		1<<0
#define DBG_ALGO	1<<1

static int i2c_debug = 0;

module_param (i2c_debug, int, 0644);			// debug_i2c_usb mode of the device driver
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");

#define PDEBUG(level, fmt, args...) \
		if (i2c_debug & (level)) info("[%s:%d] " fmt, __PRETTY_FUNCTION__, __LINE__ , ## args)

static int usbvision_i2c_write(void *data, unsigned char addr, char *buf,
			    short len);
static int usbvision_i2c_read(void *data, unsigned char addr, char *buf,
			   short len);

static inline int try_write_address(struct i2c_adapter *i2c_adap,
				    unsigned char addr, int retries)
{
	void *data;
	int i, ret = -1;
	char buf[4];

	data = i2c_get_adapdata(i2c_adap);
	buf[0] = 0x00;
	for (i = 0; i <= retries; i++) {
		ret = (usbvision_i2c_write(data, addr, buf, 1));
		if (ret == 1)
			break;	/* success! */
		udelay(5);
		if (i == retries)	/* no success */
			break;
		udelay(10);
	}
	if (i) {
		PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
		PDEBUG(DBG_ALGO,"Maybe there's no device at this address");
	}
	return ret;
}

static inline int try_read_address(struct i2c_adapter *i2c_adap,
				   unsigned char addr, int retries)
{
	void *data;
	int i, ret = -1;
	char buf[4];

	data = i2c_get_adapdata(i2c_adap);
	for (i = 0; i <= retries; i++) {
		ret = (usbvision_i2c_read(data, addr, buf, 1));
		if (ret == 1)
			break;	/* success! */
		udelay(5);
		if (i == retries)	/* no success */
			break;
		udelay(10);
	}
	if (i) {
		PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
		PDEBUG(DBG_ALGO,"Maybe there's no device at this address");
	}
	return ret;
}

static inline int usb_find_address(struct i2c_adapter *i2c_adap,
				   struct i2c_msg *msg, int retries,
				   unsigned char *add)
{
	unsigned short flags = msg->flags;

	unsigned char addr;
	int ret;
	if ((flags & I2C_M_TEN)) {
		/* a ten bit address */
		addr = 0xf0 | ((msg->addr >> 7) & 0x03);
		/* try extended address code... */
		ret = try_write_address(i2c_adap, addr, retries);
		if (ret != 1) {
			err("died at extended address code, while writing");
			return -EREMOTEIO;
		}
		add[0] = addr;
		if (flags & I2C_M_RD) {
			/* okay, now switch into reading mode */
			addr |= 0x01;
			ret = try_read_address(i2c_adap, addr, retries);
			if (ret != 1) {
				err("died at extended address code, while reading");
				return -EREMOTEIO;
			}
		}

	} else {		/* normal 7bit address  */
		addr = (msg->addr << 1);
		if (flags & I2C_M_RD)
			addr |= 1;
		if (flags & I2C_M_REV_DIR_ADDR)
			addr ^= 1;

		add[0] = addr;
		if (flags & I2C_M_RD)
			ret = try_read_address(i2c_adap, addr, retries);
		else
			ret = try_write_address(i2c_adap, addr, retries);

		if (ret != 1) {
			return -EREMOTEIO;
		}
	}
	return 0;
}

static int
usb_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
{
	struct i2c_msg *pmsg;
	void *data;
	int i, ret;
	unsigned char addr;

	data = i2c_get_adapdata(i2c_adap);

	for (i = 0; i < num; i++) {
		pmsg = &msgs[i];
		ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
		if (ret != 0) {
			PDEBUG(DBG_ALGO,"got NAK from device, message #%d", i);
			return (ret < 0) ? ret : -EREMOTEIO;
		}

		if (pmsg->flags & I2C_M_RD) {
			/* read bytes into buffer */
			ret = (usbvision_i2c_read(data, addr, pmsg->buf, pmsg->len));
			if (ret < pmsg->len) {
				return (ret < 0) ? ret : -EREMOTEIO;
			}
		} else {
			/* write bytes from buffer */
			ret = (usbvision_i2c_write(data, addr, pmsg->buf, pmsg->len));
			if (ret < pmsg->len) {
				return (ret < 0) ? ret : -EREMOTEIO;
			}
		}
	}
	return num;
}

static int algo_control(struct i2c_adapter *adapter, unsigned int cmd, unsigned long arg)
{
	return 0;
}

static u32 usb_func(struct i2c_adapter *adap)
{
	return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
}


/* -----exported algorithm data: -------------------------------------	*/

static struct i2c_algorithm i2c_usb_algo = {
	.master_xfer   = usb_xfer,
	.smbus_xfer    = NULL,
	.algo_control  = algo_control,
	.functionality = usb_func,
};


/*
 * registering functions to load algorithms at runtime
 */
static int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
{
	PDEBUG(DBG_I2C, "I2C   debugging is enabled [i2c]");
	PDEBUG(DBG_ALGO, "ALGO   debugging is enabled [i2c]");

	/* register new adapter to i2c module... */

	adap->algo = &i2c_usb_algo;

	adap->timeout = 100;	/* default values, should       */
	adap->retries = 3;	/* be replaced by defines       */

	i2c_add_adapter(adap);

	PDEBUG(DBG_ALGO,"i2c bus for %s registered", adap->name);

	return 0;
}


int usbvision_i2c_usb_del_bus(struct i2c_adapter *adap)
{

	i2c_del_adapter(adap);

	PDEBUG(DBG_ALGO,"i2c bus for %s unregistered", adap->name);

	return 0;
}


/* ----------------------------------------------------------------------- */
/* usbvision specific I2C functions                                        */
/* ----------------------------------------------------------------------- */
static struct i2c_adapter i2c_adap_template;
static struct i2c_client i2c_client_template;

int usbvision_init_i2c(struct usb_usbvision *usbvision)
{
	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
	       sizeof(struct i2c_adapter));
	memcpy(&usbvision->i2c_client, &i2c_client_template,
	       sizeof(struct i2c_client));

	sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
		" #%d", usbvision->vdev->minor & 0x1f);
	PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
	usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;

	i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
	i2c_set_clientdata(&usbvision->i2c_client, usbvision);

	usbvision->i2c_client.adapter = &usbvision->i2c_adap;

	if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
		printk(KERN_ERR "usbvision_init_i2c: can't write reg\n");
		return -EBUSY;
	}

#ifdef CONFIG_MODULES
	/* Request the load of the i2c modules we need */
	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	case CODEC_SAA7113:
		request_module("saa7115");
		break;
	case CODEC_SAA7111:
		request_module("saa7115");
		break;
	}
	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
		request_module("tuner");
	}
#endif

	return usbvision_i2c_usb_add_bus(&usbvision->i2c_adap);
}

void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
		      void *arg)
{
	i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
}

static int attach_inform(struct i2c_client *client)
{
	struct usb_usbvision *usbvision;

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);

	switch (client->addr << 1) {
		case 0x43:
		case 0x4b:
		{
			struct tuner_setup tun_setup;

			tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
			tun_setup.type = TUNER_TDA9887;
			tun_setup.addr = client->addr;

			call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);

			break;
		}
		case 0x42:
			PDEBUG(DBG_I2C,"attach_inform: saa7114 detected.");
			break;
		case 0x4a:
			PDEBUG(DBG_I2C,"attach_inform: saa7113 detected.");
			break;
		case 0x48:
			PDEBUG(DBG_I2C,"attach_inform: saa7111 detected.");
			break;
		case 0xa0:
			PDEBUG(DBG_I2C,"attach_inform: eeprom detected.");
			break;

		default:
			{
				struct tuner_setup tun_setup;

				PDEBUG(DBG_I2C,"attach inform: detected I2C address %x", client->addr << 1);
				usbvision->tuner_addr = client->addr;

				if ((usbvision->have_tuner) && (usbvision->tuner_type != -1)) {
					tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
					tun_setup.type = usbvision->tuner_type;
					tun_setup.addr = usbvision->tuner_addr;
					call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
				}
			}
			break;
	}
	return 0;
}

static int detach_inform(struct i2c_client *client)
{
	struct usb_usbvision *usbvision;

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);

	PDEBUG(DBG_I2C,"usbvision[%d] detaches %s", usbvision->nr, client->name);
	return 0;
}

static int
usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
		     char *buf, short len)
{
	int rc, retries;

	for (retries = 5;;) {
		rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
		if (rc < 0)
			return rc;

		/* Initiate byte read cycle                    */
		/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
		/*                    d3 0=Wr 1=Rd             */
		rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
				      (len & 0x07) | 0x18);
		if (rc < 0)
			return rc;

		/* Test for Busy and ACK */
		do {
			/* USBVISION_SER_CONT -> d4 == 0 busy */
			rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
		} while (rc > 0 && ((rc & 0x10) != 0));	/* Retry while busy */
		if (rc < 0)
			return rc;

		/* USBVISION_SER_CONT -> d5 == 1 Not ack */
		if ((rc & 0x20) == 0)	/* Ack? */
			break;

		/* I2C abort */
		rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
		if (rc < 0)
			return rc;

		if (--retries < 0)
			return -1;
	}

	switch (len) {
	case 4:
		buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
	case 3:
		buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
	case 2:
		buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
	case 1:
		buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
		break;
	default:
		printk(KERN_ERR
		       "usbvision_i2c_read_max4: buffer length > 4\n");
	}

	if (i2c_debug & DBG_I2C) {
		int idx;
		for (idx = 0; idx < len; idx++) {
			PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
		}
	}
	return len;
}


static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
				 unsigned char addr, const char *buf,
				 short len)
{
	int rc, retries;
	int i;
	unsigned char value[6];
	unsigned char ser_cont;

	ser_cont = (len & 0x07) | 0x10;

	value[0] = addr;
	value[1] = ser_cont;
	for (i = 0; i < len; i++)
		value[i + 2] = buf[i];

	for (retries = 5;;) {
		rc = usb_control_msg(usbvision->dev,
				     usb_sndctrlpipe(usbvision->dev, 1),
				     USBVISION_OP_CODE,
				     USB_DIR_OUT | USB_TYPE_VENDOR |
				     USB_RECIP_ENDPOINT, 0,
				     (__u16) USBVISION_SER_ADRS, value,
				     len + 2, HZ);

		if (rc < 0)
			return rc;

		rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
				      (len & 0x07) | 0x10);
		if (rc < 0)
			return rc;

		/* Test for Busy and ACK */
		do {
			rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
		} while (rc > 0 && ((rc & 0x10) != 0));	/* Retry while busy */
		if (rc < 0)
			return rc;

		if ((rc & 0x20) == 0)	/* Ack? */
			break;

		/* I2C abort */
		usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);

		if (--retries < 0)
			return -1;

	}

	if (i2c_debug & DBG_I2C) {
		int idx;
		for (idx = 0; idx < len; idx++) {
			PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
		}
	}
	return len;
}

static int usbvision_i2c_write(void *data, unsigned char addr, char *buf,
			    short len)
{
	char *bufPtr = buf;
	int retval;
	int wrcount = 0;
	int count;
	int maxLen = 4;
	struct usb_usbvision *usbvision = (struct usb_usbvision *) data;

	while (len > 0) {
		count = (len > maxLen) ? maxLen : len;
		retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
		if (retval > 0) {
			len -= count;
			bufPtr += count;
			wrcount += count;
		} else
			return (retval < 0) ? retval : -EFAULT;
	}
	return wrcount;
}

static int usbvision_i2c_read(void *data, unsigned char addr, char *buf,
			   short len)
{
	char temp[4];
	int retval, i;
	int rdcount = 0;
	int count;
	struct usb_usbvision *usbvision = (struct usb_usbvision *) data;

	while (len > 0) {
		count = (len > 3) ? 4 : len;
		retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
		if (retval > 0) {
			for (i = 0; i < len; i++)
				buf[rdcount + i] = temp[i];
			len -= count;
			rdcount += count;
		} else
			return (retval < 0) ? retval : -EFAULT;
	}
	return rdcount;
}

static struct i2c_adapter i2c_adap_template = {
	.owner = THIS_MODULE,
	.name              = "usbvision",
	.id                = I2C_HW_B_BT848, /* FIXME */
	.client_register   = attach_inform,
	.client_unregister = detach_inform,
#ifdef I2C_ADAP_CLASS_TV_ANALOG
	.class             = I2C_ADAP_CLASS_TV_ANALOG,
#else
	.class		   = I2C_CLASS_TV_ANALOG,
#endif
};

static struct i2c_client i2c_client_template = {
	.name		= "usbvision internal",
};

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */
Commit	Line	Data
f2242ee5	1	/*
781aa1d1 MCC	2	* I2C_ALGO_USB.C
	3	* i2c algorithm for USB-I2C Bridges
	4	*
	5	* Copyright (c) 1999-2005 Joerg Heckenbach <joerg@heckenbach-aw.de>
	6	* Dwaine Garden <dwainegarden@rogers.com>
	7	*
	8	* This module is part of usbvision driver project.
	9	* Updates to driver completed by Dwaine P. Garden
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26
	27	#include <linux/kernel.h>
	28	#include <linux/module.h>
	29	#include <linux/delay.h>
	30	#include <linux/slab.h>
	31	#include <linux/version.h>
a1ed551c	32	#include <linux/utsname.h>
781aa1d1 MCC	33	#include <linux/init.h>
	34	#include <asm/uaccess.h>
	35	#include <linux/ioport.h>
	36	#include <linux/errno.h>
781aa1d1 MCC	37	#include <linux/usb.h>
781aa1d1 MCC	38	#include <linux/i2c.h>
483dfdb6	39	#include "usbvision.h"
781aa1d1	40
483dfdb6 TM	41	#define DBG_I2C 1<<0
483dfdb6 TM	42	#define DBG_ALGO 1<<1
781aa1d1	43
483dfdb6 TM	44	static int i2c_debug = 0;
	45
	46	module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
	47	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
781aa1d1	48
483dfdb6 TM	49	#define PDEBUG(level, fmt, args...) \
483dfdb6 TM	50	if (i2c_debug & (level)) info("[%s:%d] " fmt, __PRETTY_FUNCTION__, __LINE__ , ## args)
781aa1d1	51
2a7e9a26 MCC	52	static int usbvision_i2c_write(void data, unsigned char addr, char buf,
	53	short len);
	54	static int usbvision_i2c_read(void data, unsigned char addr, char buf,
	55	short len);
	56
781aa1d1 MCC	57	static inline int try_write_address(struct i2c_adapter *i2c_adap,
	58	unsigned char addr, int retries)
	59	{
781aa1d1 MCC	60	void *data;
	61	int i, ret = -1;
	62	char buf[4];
	63
	64	data = i2c_get_adapdata(i2c_adap);
	65	buf[0] = 0x00;
	66	for (i = 0; i <= retries; i++) {
2a7e9a26	67	ret = (usbvision_i2c_write(data, addr, buf, 1));
781aa1d1 MCC	68	if (ret == 1)
781aa1d1 MCC	69	break; /* success! */
c6268461	70	udelay(5);
781aa1d1 MCC	71	if (i == retries) /* no success */
781aa1d1 MCC	72	break;
c6268461	73	udelay(10);
781aa1d1	74	}
483dfdb6 TM	75	if (i) {
	76	PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
	77	PDEBUG(DBG_ALGO,"Maybe there's no device at this address");
781aa1d1 MCC	78	}
	79	return ret;
	80	}
	81
	82	static inline int try_read_address(struct i2c_adapter *i2c_adap,
	83	unsigned char addr, int retries)
	84	{
781aa1d1 MCC	85	void *data;
	86	int i, ret = -1;
	87	char buf[4];
	88
	89	data = i2c_get_adapdata(i2c_adap);
	90	for (i = 0; i <= retries; i++) {
2a7e9a26	91	ret = (usbvision_i2c_read(data, addr, buf, 1));
781aa1d1 MCC	92	if (ret == 1)
781aa1d1 MCC	93	break; /* success! */
c6268461	94	udelay(5);
781aa1d1 MCC	95	if (i == retries) /* no success */
781aa1d1 MCC	96	break;
c6268461	97	udelay(10);
781aa1d1	98	}
483dfdb6 TM	99	if (i) {
	100	PDEBUG(DBG_ALGO,"Needed %d retries for address %#2x", i, addr);
	101	PDEBUG(DBG_ALGO,"Maybe there's no device at this address");
781aa1d1 MCC	102	}
	103	return ret;
	104	}
	105
	106	static inline int usb_find_address(struct i2c_adapter *i2c_adap,
	107	struct i2c_msg *msg, int retries,
	108	unsigned char *add)
	109	{
	110	unsigned short flags = msg->flags;
f2242ee5	111
781aa1d1 MCC	112	unsigned char addr;
	113	int ret;
	114	if ((flags & I2C_M_TEN)) {
	115	/* a ten bit address */
	116	addr = 0xf0 \| ((msg->addr >> 7) & 0x03);
	117	/* try extended address code... */
	118	ret = try_write_address(i2c_adap, addr, retries);
	119	if (ret != 1) {
	120	err("died at extended address code, while writing");
	121	return -EREMOTEIO;
	122	}
	123	add[0] = addr;
	124	if (flags & I2C_M_RD) {
	125	/* okay, now switch into reading mode */
	126	addr \|= 0x01;
	127	ret = try_read_address(i2c_adap, addr, retries);
	128	if (ret != 1) {
	129	err("died at extended address code, while reading");
	130	return -EREMOTEIO;
	131	}
	132	}
	133
	134	} else { /* normal 7bit address */
	135	addr = (msg->addr << 1);
	136	if (flags & I2C_M_RD)
	137	addr \|= 1;
	138	if (flags & I2C_M_REV_DIR_ADDR)
	139	addr ^= 1;
	140
	141	add[0] = addr;
	142	if (flags & I2C_M_RD)
	143	ret = try_read_address(i2c_adap, addr, retries);
	144	else
	145	ret = try_write_address(i2c_adap, addr, retries);
	146
	147	if (ret != 1) {
	148	return -EREMOTEIO;
	149	}
	150	}
	151	return 0;
	152	}
	153
	154	static int
	155	usb_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
	156	{
	157	struct i2c_msg *pmsg;
781aa1d1 MCC	158	void *data;
	159	int i, ret;
	160	unsigned char addr;
	161
	162	data = i2c_get_adapdata(i2c_adap);
	163
	164	for (i = 0; i < num; i++) {
	165	pmsg = &msgs[i];
	166	ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
	167	if (ret != 0) {
483dfdb6	168	PDEBUG(DBG_ALGO,"got NAK from device, message #%d", i);
781aa1d1 MCC	169	return (ret < 0) ? ret : -EREMOTEIO;
	170	}
	171
	172	if (pmsg->flags & I2C_M_RD) {
	173	/* read bytes into buffer */
2a7e9a26	174	ret = (usbvision_i2c_read(data, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	175	if (ret < pmsg->len) {
	176	return (ret < 0) ? ret : -EREMOTEIO;
	177	}
	178	} else {
	179	/* write bytes from buffer */
2a7e9a26	180	ret = (usbvision_i2c_write(data, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	181	if (ret < pmsg->len) {
	182	return (ret < 0) ? ret : -EREMOTEIO;
	183	}
	184	}
	185	}
	186	return num;
	187	}
	188
	189	static int algo_control(struct i2c_adapter *adapter, unsigned int cmd, unsigned long arg)
	190	{
	191	return 0;
	192	}
	193
	194	static u32 usb_func(struct i2c_adapter *adap)
	195	{
	196	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_10BIT_ADDR \| I2C_FUNC_PROTOCOL_MANGLING;
	197	}
	198
	199
	200	/* -----exported algorithm data: ------------------------------------- */
	201
	202	static struct i2c_algorithm i2c_usb_algo = {
	203	.master_xfer = usb_xfer,
	204	.smbus_xfer = NULL,
781aa1d1 MCC	205	.algo_control = algo_control,
	206	.functionality = usb_func,
	207	};
	208
	209
	210	/*
	211	* registering functions to load algorithms at runtime
	212	*/
0a0ceade	213	static int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
781aa1d1	214	{
483dfdb6 TM	215	PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
	216	PDEBUG(DBG_ALGO, "ALGO debugging is enabled [i2c]");
	217
781aa1d1 MCC	218	/* register new adapter to i2c module... */
	219
	220	adap->algo = &i2c_usb_algo;
	221
	222	adap->timeout = 100; /* default values, should */
	223	adap->retries = 3; /* be replaced by defines */
	224
781aa1d1 MCC	225	i2c_add_adapter(adap);
781aa1d1 MCC	226
483dfdb6	227	PDEBUG(DBG_ALGO,"i2c bus for %s registered", adap->name);
781aa1d1 MCC	228
	229	return 0;
	230	}
	231
	232
	233	int usbvision_i2c_usb_del_bus(struct i2c_adapter *adap)
	234	{
	235
	236	i2c_del_adapter(adap);
	237
483dfdb6 TM	238	PDEBUG(DBG_ALGO,"i2c bus for %s unregistered", adap->name);
	239
	240	return 0;
	241	}
	242
	243
	244	/* ----------------------------------------------------------------------- */
	245	/* usbvision specific I2C functions */
	246	/* ----------------------------------------------------------------------- */
	247	static struct i2c_adapter i2c_adap_template;
483dfdb6 TM	248	static struct i2c_client i2c_client_template;
	249
	250	int usbvision_init_i2c(struct usb_usbvision *usbvision)
	251	{
	252	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
	253	sizeof(struct i2c_adapter));
483dfdb6 TM	254	memcpy(&usbvision->i2c_client, &i2c_client_template,
	255	sizeof(struct i2c_client));
	256
	257	sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
	258	" #%d", usbvision->vdev->minor & 0x1f);
	259	PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
12a917f6	260	usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
483dfdb6 TM	261
	262	i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
	263	i2c_set_clientdata(&usbvision->i2c_client, usbvision);
483dfdb6	264
483dfdb6 TM	265	usbvision->i2c_client.adapter = &usbvision->i2c_adap;
	266
	267	if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
	268	printk(KERN_ERR "usbvision_init_i2c: can't write reg\n");
	269	return -EBUSY;
	270	}
	271
	272	#ifdef CONFIG_MODULES
	273	/* Request the load of the i2c modules we need */
	274	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	275	case CODEC_SAA7113:
	276	request_module("saa7115");
	277	break;
	278	case CODEC_SAA7111:
	279	request_module("saa7115");
	280	break;
	281	}
	282	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
	283	request_module("tuner");
781aa1d1	284	}
781aa1d1 MCC	285	#endif
781aa1d1 MCC	286
483dfdb6 TM	287	return usbvision_i2c_usb_add_bus(&usbvision->i2c_adap);
	288	}
	289
	290	void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
	291	void *arg)
	292	{
483dfdb6 TM	293	i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
	294	}
	295
	296	static int attach_inform(struct i2c_client *client)
	297	{
	298	struct usb_usbvision *usbvision;
	299
	300	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
	301
	302	switch (client->addr << 1) {
	303	case 0x43:
	304	case 0x4b:
	305	{
	306	struct tuner_setup tun_setup;
	307
	308	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	309	tun_setup.type = TUNER_TDA9887;
	310	tun_setup.addr = client->addr;
	311
	312	call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
	313
	314	break;
	315	}
	316	case 0x42:
	317	PDEBUG(DBG_I2C,"attach_inform: saa7114 detected.");
	318	break;
	319	case 0x4a:
	320	PDEBUG(DBG_I2C,"attach_inform: saa7113 detected.");
	321	break;
38284ba3 TM	322	case 0x48:
	323	PDEBUG(DBG_I2C,"attach_inform: saa7111 detected.");
	324	break;
483dfdb6 TM	325	case 0xa0:
	326	PDEBUG(DBG_I2C,"attach_inform: eeprom detected.");
	327	break;
	328
	329	default:
	330	{
	331	struct tuner_setup tun_setup;
	332
	333	PDEBUG(DBG_I2C,"attach inform: detected I2C address %x", client->addr << 1);
	334	usbvision->tuner_addr = client->addr;
	335
	336	if ((usbvision->have_tuner) && (usbvision->tuner_type != -1)) {
	337	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	338	tun_setup.type = usbvision->tuner_type;
	339	tun_setup.addr = usbvision->tuner_addr;
	340	call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
	341	}
	342	}
	343	break;
	344	}
781aa1d1 MCC	345	return 0;
	346	}
	347
483dfdb6 TM	348	static int detach_inform(struct i2c_client *client)
	349	{
	350	struct usb_usbvision *usbvision;
	351
a1ed551c	352	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
483dfdb6	353
a1ed551c	354	PDEBUG(DBG_I2C,"usbvision[%d] detaches %s", usbvision->nr, client->name);
483dfdb6 TM	355	return 0;
	356	}
	357
	358	static int
	359	usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
	360	char *buf, short len)
	361	{
	362	int rc, retries;
	363
	364	for (retries = 5;;) {
	365	rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
	366	if (rc < 0)
	367	return rc;
	368
	369	/* Initiate byte read cycle */
	370	/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
	371	/* d3 0=Wr 1=Rd */
	372	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
	373	(len & 0x07) \| 0x18);
	374	if (rc < 0)
	375	return rc;
	376
	377	/* Test for Busy and ACK */
	378	do {
	379	/* USBVISION_SER_CONT -> d4 == 0 busy */
	380	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
	381	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
	382	if (rc < 0)
	383	return rc;
	384
	385	/* USBVISION_SER_CONT -> d5 == 1 Not ack */
	386	if ((rc & 0x20) == 0) /* Ack? */
	387	break;
	388
	389	/* I2C abort */
	390	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
	391	if (rc < 0)
	392	return rc;
	393
	394	if (--retries < 0)
	395	return -1;
	396	}
	397
	398	switch (len) {
	399	case 4:
	400	buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
	401	case 3:
	402	buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
	403	case 2:
	404	buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
	405	case 1:
	406	buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
	407	break;
	408	default:
	409	printk(KERN_ERR
	410	"usbvision_i2c_read_max4: buffer length > 4\n");
	411	}
	412
	413	if (i2c_debug & DBG_I2C) {
	414	int idx;
	415	for (idx = 0; idx < len; idx++) {
	416	PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
	417	}
	418	}
419	return len;
420	}
421
422
423	static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
424	unsigned char addr, const char *buf,
425	short len)
426	{
427	int rc, retries;
428	int i;
429	unsigned char value[6];
430	unsigned char ser_cont;
431
432	ser_cont = (len & 0x07) \| 0x10;
433
434	value[0] = addr;
435	value[1] = ser_cont;
436	for (i = 0; i < len; i++)
437	value[i + 2] = buf[i];
438
439	for (retries = 5;;) {
440	rc = usb_control_msg(usbvision->dev,
441	usb_sndctrlpipe(usbvision->dev, 1),
442	USBVISION_OP_CODE,
443	USB_DIR_OUT \| USB_TYPE_VENDOR \|
444	USB_RECIP_ENDPOINT, 0,
445	(__u16) USBVISION_SER_ADRS, value,
446	len + 2, HZ);
447
448	if (rc < 0)
449	return rc;
450
451	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
452	(len & 0x07) \| 0x10);
453	if (rc < 0)
454	return rc;
455
456	/* Test for Busy and ACK */
457	do {
458	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
459	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
460	if (rc < 0)
461	return rc;
462
463	if ((rc & 0x20) == 0) /* Ack? */
464	break;
465
466	/* I2C abort */
467	usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
468
469	if (--retries < 0)
470	return -1;
471
472	}
473
474	if (i2c_debug & DBG_I2C) {
475	int idx;
476	for (idx = 0; idx < len; idx++) {
477	PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
478	}
479	}
480	return len;
481	}
482
483	static int usbvision_i2c_write(void data, unsigned char addr, char buf,
484	short len)
485	{
486	char *bufPtr = buf;
487	int retval;
488	int wrcount = 0;
489	int count;
490	int maxLen = 4;
491	struct usb_usbvision usbvision = (struct usb_usbvision ) data;
492
493	while (len > 0) {
494	count = (len > maxLen) ? maxLen : len;
495	retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
496	if (retval > 0) {
497	len -= count;
498	bufPtr += count;
499	wrcount += count;
500	} else
501	return (retval < 0) ? retval : -EFAULT;
502	}
503	return wrcount;
504	}
505
506	static int usbvision_i2c_read(void data, unsigned char addr, char buf,
507	short len)
508	{
509	char temp[4];
510	int retval, i;
511	int rdcount = 0;
512	int count;
513	struct usb_usbvision usbvision = (struct usb_usbvision ) data;
514
515	while (len > 0) {
516	count = (len > 3) ? 4 : len;
517	retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
518	if (retval > 0) {
519	for (i = 0; i < len; i++)
520	buf[rdcount + i] = temp[i];
521	len -= count;
522	rdcount += count;
523	} else
524	return (retval < 0) ? retval : -EFAULT;
525	}
526	return rdcount;
527	}
528
483dfdb6 TM	529	static struct i2c_adapter i2c_adap_template = {
	530	.owner = THIS_MODULE,
	531	.name = "usbvision",
	532	.id = I2C_HW_B_BT848, /* FIXME */
483dfdb6 TM	533	.client_register = attach_inform,
483dfdb6 TM	534	.client_unregister = detach_inform,
a1ed551c	535	#ifdef I2C_ADAP_CLASS_TV_ANALOG
483dfdb6	536	.class = I2C_ADAP_CLASS_TV_ANALOG,
a1ed551c	537	#else
483dfdb6 TM	538	.class = I2C_CLASS_TV_ANALOG,
	539	#endif
	540	};
	541
	542	static struct i2c_client i2c_client_template = {
	543	.name = "usbvision internal",
	544	};
	545
483dfdb6 TM	546	/*
	547	* Overrides for Emacs so that we follow Linus's tabbing style.
	548	* ---------------------------------------------------------------------------
	549	* Local variables:
	550	* c-basic-offset: 8
	551	* End:
	552	*/