[linux-2.6-block.git] / drivers / media / video / usbvision / usbvision-i2c.c

/*
 * usbvision_i2c.c
 *  i2c algorithm for USB-I2C Bridges
 *
 * Copyright (c) 1999-2007 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

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(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
			    short len);
static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
			   short len);

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

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
	buf[0] = 0x00;
	for (i = 0; i <= retries; i++) {
		ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
		if (ret == 1)
			break;	/* success! */
		udelay(5);
		if (i == retries)	/* no success */
			break;
		udelay(10);
	}
	if (i) {
		PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
		PDEBUG(DBG_I2C,"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)
{
	struct usb_usbvision *usbvision;
	int i, ret = -1;
	char buf[4];

	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
	for (i = 0; i <= retries; i++) {
		ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
		if (ret == 1)
			break;	/* success! */
		udelay(5);
		if (i == retries)	/* no success */
			break;
		udelay(10);
	}
	if (i) {
		PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
		PDEBUG(DBG_I2C,"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;

		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
usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
{
	struct i2c_msg *pmsg;
	struct usb_usbvision *usbvision;
	int i, ret;
	unsigned char addr;

	usbvision = (struct usb_usbvision *)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_I2C,"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(usbvision, addr, pmsg->buf, pmsg->len));
			if (ret < pmsg->len) {
				return (ret < 0) ? ret : -EREMOTEIO;
			}
		} else {
			/* write bytes from buffer */
			ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
			if (ret < pmsg->len) {
				return (ret < 0) ? ret : -EREMOTEIO;
			}
		}
	}
	return num;
}

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


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

static struct i2c_algorithm usbvision_algo = {
	.master_xfer   = usbvision_i2c_xfer,
	.smbus_xfer    = NULL,
	.functionality = functionality,
};


/*
 * 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_I2C, "ALGO   debugging is enabled [i2c]");

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

	adap->algo = &usbvision_algo;

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

	i2c_add_adapter(adap);

	PDEBUG(DBG_I2C,"i2c bus for %s registered", adap->name);

	return 0;
}

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

int usbvision_i2c_register(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_register: 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);
}

int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
{

	i2c_del_adapter(&(usbvision->i2c_adap));

	PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);

	return 0;
}

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 0x42 << 1:
		case 0x43 << 1:
		case 0x4a << 1:
		case 0x4b << 1:
			PDEBUG(DBG_I2C,"attach_inform: tda9887 detected.");
			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(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
			    short len)
{
	char *bufPtr = buf;
	int retval;
	int wrcount = 0;
	int count;
	int maxLen = 4;

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

	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	/*
1ff16c20	2	* usbvision_i2c.c
781aa1d1 MCC	3	* i2c algorithm for USB-I2C Bridges
781aa1d1 MCC	4	*
1ff16c20	5	* Copyright (c) 1999-2007 Joerg Heckenbach <joerg@heckenbach-aw.de>
781aa1d1 MCC	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	41	#define DBG_I2C 1<<0
781aa1d1	42
483dfdb6 TM	43	static int i2c_debug = 0;
	44
	45	module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
	46	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
781aa1d1	47
483dfdb6 TM	48	#define PDEBUG(level, fmt, args...) \
483dfdb6 TM	49	if (i2c_debug & (level)) info("[%s:%d] " fmt, __PRETTY_FUNCTION__, __LINE__ , ## args)
781aa1d1	50
1ff16c20	51	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26	52	short len);
1ff16c20	53	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26 MCC	54	short len);
2a7e9a26 MCC	55
781aa1d1 MCC	56	static inline int try_write_address(struct i2c_adapter *i2c_adap,
	57	unsigned char addr, int retries)
	58	{
1ff16c20	59	struct usb_usbvision *usbvision;
781aa1d1 MCC	60	int i, ret = -1;
	61	char buf[4];
	62
bf8b20e1	63	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1 MCC	64	buf[0] = 0x00;
781aa1d1 MCC	65	for (i = 0; i <= retries; i++) {
1ff16c20	66	ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
781aa1d1 MCC	67	if (ret == 1)
781aa1d1 MCC	68	break; /* success! */
c6268461	69	udelay(5);
781aa1d1 MCC	70	if (i == retries) /* no success */
781aa1d1 MCC	71	break;
c6268461	72	udelay(10);
781aa1d1	73	}
483dfdb6	74	if (i) {
1ff16c20 TM	75	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	76	PDEBUG(DBG_I2C,"Maybe there's no device at this address");
781aa1d1 MCC	77	}
	78	return ret;
	79	}
	80
	81	static inline int try_read_address(struct i2c_adapter *i2c_adap,
	82	unsigned char addr, int retries)
	83	{
1ff16c20	84	struct usb_usbvision *usbvision;
781aa1d1 MCC	85	int i, ret = -1;
	86	char buf[4];
	87
bf8b20e1	88	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1	89	for (i = 0; i <= retries; i++) {
1ff16c20	90	ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
781aa1d1 MCC	91	if (ret == 1)
781aa1d1 MCC	92	break; /* success! */
c6268461	93	udelay(5);
781aa1d1 MCC	94	if (i == retries) /* no success */
781aa1d1 MCC	95	break;
c6268461	96	udelay(10);
781aa1d1	97	}
483dfdb6	98	if (i) {
1ff16c20 TM	99	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	100	PDEBUG(DBG_I2C,"Maybe there's no device at this address");
781aa1d1 MCC	101	}
	102	return ret;
	103	}
	104
	105	static inline int usb_find_address(struct i2c_adapter *i2c_adap,
	106	struct i2c_msg *msg, int retries,
	107	unsigned char *add)
	108	{
	109	unsigned short flags = msg->flags;
f2242ee5	110
781aa1d1 MCC	111	unsigned char addr;
	112	int ret;
	113	if ((flags & I2C_M_TEN)) {
	114	/* a ten bit address */
	115	addr = 0xf0 \| ((msg->addr >> 7) & 0x03);
	116	/* try extended address code... */
	117	ret = try_write_address(i2c_adap, addr, retries);
	118	if (ret != 1) {
	119	err("died at extended address code, while writing");
	120	return -EREMOTEIO;
	121	}
	122	add[0] = addr;
	123	if (flags & I2C_M_RD) {
	124	/* okay, now switch into reading mode */
	125	addr \|= 0x01;
	126	ret = try_read_address(i2c_adap, addr, retries);
	127	if (ret != 1) {
	128	err("died at extended address code, while reading");
	129	return -EREMOTEIO;
	130	}
	131	}
	132
	133	} else { /* normal 7bit address */
	134	addr = (msg->addr << 1);
	135	if (flags & I2C_M_RD)
	136	addr \|= 1;
781aa1d1 MCC	137
	138	add[0] = addr;
	139	if (flags & I2C_M_RD)
	140	ret = try_read_address(i2c_adap, addr, retries);
	141	else
	142	ret = try_write_address(i2c_adap, addr, retries);
	143
	144	if (ret != 1) {
	145	return -EREMOTEIO;
	146	}
	147	}
	148	return 0;
	149	}
	150
	151	static int
1ff16c20	152	usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
781aa1d1 MCC	153	{
781aa1d1 MCC	154	struct i2c_msg *pmsg;
1ff16c20	155	struct usb_usbvision *usbvision;
781aa1d1 MCC	156	int i, ret;
	157	unsigned char addr;
	158
bf8b20e1 TM	159	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
bf8b20e1 TM	160
781aa1d1 MCC	161	for (i = 0; i < num; i++) {
	162	pmsg = &msgs[i];
	163	ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
	164	if (ret != 0) {
1ff16c20	165	PDEBUG(DBG_I2C,"got NAK from device, message #%d", i);
781aa1d1 MCC	166	return (ret < 0) ? ret : -EREMOTEIO;
	167	}
	168
	169	if (pmsg->flags & I2C_M_RD) {
	170	/* read bytes into buffer */
1ff16c20	171	ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	172	if (ret < pmsg->len) {
	173	return (ret < 0) ? ret : -EREMOTEIO;
	174	}
	175	} else {
	176	/* write bytes from buffer */
1ff16c20	177	ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	178	if (ret < pmsg->len) {
	179	return (ret < 0) ? ret : -EREMOTEIO;
	180	}
	181	}
	182	}
	183	return num;
	184	}
	185
1ff16c20	186	static u32 functionality(struct i2c_adapter *adap)
781aa1d1	187	{
39f46ade	188	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_10BIT_ADDR;
781aa1d1 MCC	189	}
	190
	191
	192	/* -----exported algorithm data: ------------------------------------- */
	193
1ff16c20 TM	194	static struct i2c_algorithm usbvision_algo = {
1ff16c20 TM	195	.master_xfer = usbvision_i2c_xfer,
781aa1d1	196	.smbus_xfer = NULL,
1ff16c20	197	.functionality = functionality,
781aa1d1 MCC	198	};
	199
	200
bf8b20e1 TM	201	/*
	202	* registering functions to load algorithms at runtime
	203	*/
	204	static int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
	205	{
	206	PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
	207	PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
	208
	209	/* register new adapter to i2c module... */
	210
	211	adap->algo = &usbvision_algo;
	212
	213	adap->timeout = 100; /* default values, should */
	214	adap->retries = 3; /* be replaced by defines */
	215
	216	i2c_add_adapter(adap);
	217
	218	PDEBUG(DBG_I2C,"i2c bus for %s registered", adap->name);
	219
	220	return 0;
	221	}
	222
483dfdb6 TM	223	/* ----------------------------------------------------------------------- */
	224	/* usbvision specific I2C functions */
	225	/* ----------------------------------------------------------------------- */
	226	static struct i2c_adapter i2c_adap_template;
483dfdb6 TM	227	static struct i2c_client i2c_client_template;
483dfdb6 TM	228
1ff16c20	229	int usbvision_i2c_register(struct usb_usbvision *usbvision)
483dfdb6	230	{
bf8b20e1 TM	231	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
	232	sizeof(struct i2c_adapter));
	233	memcpy(&usbvision->i2c_client, &i2c_client_template,
	234	sizeof(struct i2c_client));
483dfdb6	235
1ff16c20 TM	236	sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
1ff16c20 TM	237	" #%d", usbvision->vdev->minor & 0x1f);
bf8b20e1 TM	238	PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
	239	usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
	240
	241	i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
	242	i2c_set_clientdata(&usbvision->i2c_client, usbvision);
1ff16c20	243
483dfdb6 TM	244	usbvision->i2c_client.adapter = &usbvision->i2c_adap;
	245
	246	if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
bf8b20e1	247	printk(KERN_ERR "usbvision_register: can't write reg\n");
483dfdb6 TM	248	return -EBUSY;
	249	}
	250
	251	#ifdef CONFIG_MODULES
	252	/* Request the load of the i2c modules we need */
	253	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	254	case CODEC_SAA7113:
	255	request_module("saa7115");
	256	break;
	257	case CODEC_SAA7111:
	258	request_module("saa7115");
	259	break;
	260	}
	261	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
	262	request_module("tuner");
781aa1d1	263	}
781aa1d1 MCC	264	#endif
781aa1d1 MCC	265
bf8b20e1	266	return usbvision_i2c_usb_add_bus(&usbvision->i2c_adap);
1ff16c20 TM	267	}
	268
	269	int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
	270	{
	271
	272	i2c_del_adapter(&(usbvision->i2c_adap));
	273
	274	PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
	275
	276	return 0;
483dfdb6 TM	277	}
	278
	279	void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
	280	void *arg)
	281	{
483dfdb6 TM	282	i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
	283	}
	284
	285	static int attach_inform(struct i2c_client *client)
	286	{
	287	struct usb_usbvision *usbvision;
	288
bf8b20e1 TM	289	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
bf8b20e1 TM	290
483dfdb6	291	switch (client->addr << 1) {
3153bd91 TP	292	case 0x42 << 1:
	293	case 0x43 << 1:
	294	case 0x4a << 1:
	295	case 0x4b << 1:
6284feaf	296	PDEBUG(DBG_I2C,"attach_inform: tda9887 detected.");
483dfdb6	297	break;
483dfdb6 TM	298	case 0x42:
	299	PDEBUG(DBG_I2C,"attach_inform: saa7114 detected.");
	300	break;
	301	case 0x4a:
	302	PDEBUG(DBG_I2C,"attach_inform: saa7113 detected.");
	303	break;
38284ba3 TM	304	case 0x48:
	305	PDEBUG(DBG_I2C,"attach_inform: saa7111 detected.");
	306	break;
483dfdb6 TM	307	case 0xa0:
	308	PDEBUG(DBG_I2C,"attach_inform: eeprom detected.");
	309	break;
	310
	311	default:
	312	{
	313	struct tuner_setup tun_setup;
	314
	315	PDEBUG(DBG_I2C,"attach inform: detected I2C address %x", client->addr << 1);
	316	usbvision->tuner_addr = client->addr;
	317
	318	if ((usbvision->have_tuner) && (usbvision->tuner_type != -1)) {
	319	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	320	tun_setup.type = usbvision->tuner_type;
	321	tun_setup.addr = usbvision->tuner_addr;
	322	call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
	323	}
	324	}
	325	break;
	326	}
781aa1d1 MCC	327	return 0;
	328	}
	329
483dfdb6 TM	330	static int detach_inform(struct i2c_client *client)
	331	{
	332	struct usb_usbvision *usbvision;
	333
bf8b20e1	334	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
483dfdb6	335
a1ed551c	336	PDEBUG(DBG_I2C,"usbvision[%d] detaches %s", usbvision->nr, client->name);
483dfdb6 TM	337	return 0;
	338	}
	339
	340	static int
	341	usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
	342	char *buf, short len)
	343	{
	344	int rc, retries;
	345
	346	for (retries = 5;;) {
	347	rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
	348	if (rc < 0)
	349	return rc;
	350
	351	/* Initiate byte read cycle */
	352	/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
	353	/* d3 0=Wr 1=Rd */
	354	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
	355	(len & 0x07) \| 0x18);
	356	if (rc < 0)
	357	return rc;
	358
	359	/* Test for Busy and ACK */
	360	do {
	361	/* USBVISION_SER_CONT -> d4 == 0 busy */
	362	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
	363	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
	364	if (rc < 0)
	365	return rc;
	366
	367	/* USBVISION_SER_CONT -> d5 == 1 Not ack */
	368	if ((rc & 0x20) == 0) /* Ack? */
	369	break;
	370
	371	/* I2C abort */
	372	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
	373	if (rc < 0)
	374	return rc;
	375
	376	if (--retries < 0)
	377	return -1;
	378	}
	379
	380	switch (len) {
	381	case 4:
	382	buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
	383	case 3:
	384	buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
	385	case 2:
	386	buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
	387	case 1:
	388	buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
	389	break;
	390	default:
	391	printk(KERN_ERR
	392	"usbvision_i2c_read_max4: buffer length > 4\n");
	393	}
	394
	395	if (i2c_debug & DBG_I2C) {
	396	int idx;
	397	for (idx = 0; idx < len; idx++) {
	398	PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
	399	}
	400	}
401	return len;
402	}
403
404
405	static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
406	unsigned char addr, const char *buf,
407	short len)
408	{
409	int rc, retries;
410	int i;
411	unsigned char value[6];
412	unsigned char ser_cont;
413
414	ser_cont = (len & 0x07) \| 0x10;
415
416	value[0] = addr;
417	value[1] = ser_cont;
418	for (i = 0; i < len; i++)
419	value[i + 2] = buf[i];
420
421	for (retries = 5;;) {
422	rc = usb_control_msg(usbvision->dev,
423	usb_sndctrlpipe(usbvision->dev, 1),
424	USBVISION_OP_CODE,
425	USB_DIR_OUT \| USB_TYPE_VENDOR \|
426	USB_RECIP_ENDPOINT, 0,
427	(__u16) USBVISION_SER_ADRS, value,
428	len + 2, HZ);
429
430	if (rc < 0)
431	return rc;
432
433	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
434	(len & 0x07) \| 0x10);
435	if (rc < 0)
436	return rc;
437
438	/* Test for Busy and ACK */
439	do {
440	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
441	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
442	if (rc < 0)
443	return rc;
444
445	if ((rc & 0x20) == 0) /* Ack? */
446	break;
447
448	/* I2C abort */
449	usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
450
451	if (--retries < 0)
452	return -1;
453
454	}
455
456	if (i2c_debug & DBG_I2C) {
457	int idx;
458	for (idx = 0; idx < len; idx++) {
459	PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
460	}
461	}
462	return len;
463	}
464
1ff16c20	465	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	466	short len)
	467	{
	468	char *bufPtr = buf;
	469	int retval;
	470	int wrcount = 0;
	471	int count;
	472	int maxLen = 4;
483dfdb6 TM	473
	474	while (len > 0) {
	475	count = (len > maxLen) ? maxLen : len;
	476	retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
	477	if (retval > 0) {
	478	len -= count;
	479	bufPtr += count;
	480	wrcount += count;
	481	} else
	482	return (retval < 0) ? retval : -EFAULT;
	483	}
	484	return wrcount;
	485	}
	486
1ff16c20	487	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	488	short len)
	489	{
	490	char temp[4];
	491	int retval, i;
	492	int rdcount = 0;
	493	int count;
483dfdb6 TM	494
	495	while (len > 0) {
	496	count = (len > 3) ? 4 : len;
	497	retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
	498	if (retval > 0) {
	499	for (i = 0; i < len; i++)
	500	buf[rdcount + i] = temp[i];
	501	len -= count;
	502	rdcount += count;
	503	} else
	504	return (retval < 0) ? retval : -EFAULT;
	505	}
	506	return rdcount;
	507	}
	508
483dfdb6 TM	509	static struct i2c_adapter i2c_adap_template = {
	510	.owner = THIS_MODULE,
	511	.name = "usbvision",
	512	.id = I2C_HW_B_BT848, /* FIXME */
483dfdb6 TM	513	.client_register = attach_inform,
483dfdb6 TM	514	.client_unregister = detach_inform,
a1ed551c	515	#ifdef I2C_ADAP_CLASS_TV_ANALOG
483dfdb6	516	.class = I2C_ADAP_CLASS_TV_ANALOG,
a1ed551c	517	#else
483dfdb6 TM	518	.class = I2C_CLASS_TV_ANALOG,
	519	#endif
	520	};
	521
	522	static struct i2c_client i2c_client_template = {
	523	.name = "usbvision internal",
	524	};
	525
483dfdb6 TM	526	/*
	527	* Overrides for Emacs so that we follow Linus's tabbing style.
	528	* ---------------------------------------------------------------------------
	529	* Local variables:
	530	* c-basic-offset: 8
	531	* End:
	532	*/