[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;

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, __func__, __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,
	.class		   = I2C_CLASS_TV_ANALOG,
};

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
ff699e6b	43	static int i2c_debug;
483dfdb6 TM	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
df18c319 TM	48	#define PDEBUG(level, fmt, args...) { \
	49	if (i2c_debug & (level)) \
	50	info("[%s:%d] " fmt, __func__, __LINE__ , ## args); \
	51	}
781aa1d1	52
1ff16c20	53	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26	54	short len);
1ff16c20	55	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26 MCC	56	short len);
2a7e9a26 MCC	57
781aa1d1 MCC	58	static inline int try_write_address(struct i2c_adapter *i2c_adap,
	59	unsigned char addr, int retries)
	60	{
1ff16c20	61	struct usb_usbvision *usbvision;
781aa1d1 MCC	62	int i, ret = -1;
	63	char buf[4];
	64
bf8b20e1	65	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1 MCC	66	buf[0] = 0x00;
781aa1d1 MCC	67	for (i = 0; i <= retries; i++) {
1ff16c20	68	ret = (usbvision_i2c_write(usbvision, addr, buf, 1));
781aa1d1 MCC	69	if (ret == 1)
781aa1d1 MCC	70	break; /* success! */
c6268461	71	udelay(5);
781aa1d1 MCC	72	if (i == retries) /* no success */
781aa1d1 MCC	73	break;
c6268461	74	udelay(10);
781aa1d1	75	}
483dfdb6	76	if (i) {
1ff16c20 TM	77	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	78	PDEBUG(DBG_I2C,"Maybe there's no device at this address");
781aa1d1 MCC	79	}
	80	return ret;
	81	}
	82
	83	static inline int try_read_address(struct i2c_adapter *i2c_adap,
	84	unsigned char addr, int retries)
	85	{
1ff16c20	86	struct usb_usbvision *usbvision;
781aa1d1 MCC	87	int i, ret = -1;
	88	char buf[4];
	89
bf8b20e1	90	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1	91	for (i = 0; i <= retries; i++) {
1ff16c20	92	ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
781aa1d1 MCC	93	if (ret == 1)
781aa1d1 MCC	94	break; /* success! */
c6268461	95	udelay(5);
781aa1d1 MCC	96	if (i == retries) /* no success */
781aa1d1 MCC	97	break;
c6268461	98	udelay(10);
781aa1d1	99	}
483dfdb6	100	if (i) {
1ff16c20 TM	101	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	102	PDEBUG(DBG_I2C,"Maybe there's no device at this address");
781aa1d1 MCC	103	}
	104	return ret;
	105	}
	106
	107	static inline int usb_find_address(struct i2c_adapter *i2c_adap,
	108	struct i2c_msg *msg, int retries,
	109	unsigned char *add)
	110	{
	111	unsigned short flags = msg->flags;
f2242ee5	112
781aa1d1 MCC	113	unsigned char addr;
	114	int ret;
	115	if ((flags & I2C_M_TEN)) {
	116	/* a ten bit address */
	117	addr = 0xf0 \| ((msg->addr >> 7) & 0x03);
	118	/* try extended address code... */
	119	ret = try_write_address(i2c_adap, addr, retries);
	120	if (ret != 1) {
	121	err("died at extended address code, while writing");
	122	return -EREMOTEIO;
	123	}
	124	add[0] = addr;
	125	if (flags & I2C_M_RD) {
	126	/* okay, now switch into reading mode */
	127	addr \|= 0x01;
	128	ret = try_read_address(i2c_adap, addr, retries);
	129	if (ret != 1) {
	130	err("died at extended address code, while reading");
	131	return -EREMOTEIO;
	132	}
	133	}
	134
	135	} else { /* normal 7bit address */
	136	addr = (msg->addr << 1);
	137	if (flags & I2C_M_RD)
	138	addr \|= 1;
781aa1d1 MCC	139
	140	add[0] = addr;
	141	if (flags & I2C_M_RD)
	142	ret = try_read_address(i2c_adap, addr, retries);
	143	else
	144	ret = try_write_address(i2c_adap, addr, retries);
	145
	146	if (ret != 1) {
	147	return -EREMOTEIO;
	148	}
	149	}
	150	return 0;
	151	}
	152
	153	static int
1ff16c20	154	usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
781aa1d1 MCC	155	{
781aa1d1 MCC	156	struct i2c_msg *pmsg;
1ff16c20	157	struct usb_usbvision *usbvision;
781aa1d1 MCC	158	int i, ret;
	159	unsigned char addr;
	160
bf8b20e1 TM	161	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
bf8b20e1 TM	162
781aa1d1 MCC	163	for (i = 0; i < num; i++) {
	164	pmsg = &msgs[i];
	165	ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
	166	if (ret != 0) {
1ff16c20	167	PDEBUG(DBG_I2C,"got NAK from device, message #%d", i);
781aa1d1 MCC	168	return (ret < 0) ? ret : -EREMOTEIO;
	169	}
	170
	171	if (pmsg->flags & I2C_M_RD) {
	172	/* read bytes into buffer */
1ff16c20	173	ret = (usbvision_i2c_read(usbvision, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	174	if (ret < pmsg->len) {
	175	return (ret < 0) ? ret : -EREMOTEIO;
	176	}
	177	} else {
	178	/* write bytes from buffer */
1ff16c20	179	ret = (usbvision_i2c_write(usbvision, addr, pmsg->buf, pmsg->len));
781aa1d1 MCC	180	if (ret < pmsg->len) {
	181	return (ret < 0) ? ret : -EREMOTEIO;
	182	}
	183	}
	184	}
	185	return num;
	186	}
	187
1ff16c20	188	static u32 functionality(struct i2c_adapter *adap)
781aa1d1	189	{
39f46ade	190	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_10BIT_ADDR;
781aa1d1 MCC	191	}
781aa1d1 MCC	192
781aa1d1 MCC	193	/* -----exported algorithm data: ------------------------------------- */
781aa1d1 MCC	194
1ff16c20 TM	195	static struct i2c_algorithm usbvision_algo = {
1ff16c20 TM	196	.master_xfer = usbvision_i2c_xfer,
781aa1d1	197	.smbus_xfer = NULL,
1ff16c20	198	.functionality = functionality,
781aa1d1 MCC	199	};
	200
	201
bf8b20e1 TM	202	/*
	203	* registering functions to load algorithms at runtime
	204	*/
	205	static int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
	206	{
	207	PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
	208	PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
	209
	210	/* register new adapter to i2c module... */
	211
	212	adap->algo = &usbvision_algo;
	213
	214	adap->timeout = 100; /* default values, should */
	215	adap->retries = 3; /* be replaced by defines */
	216
	217	i2c_add_adapter(adap);
	218
	219	PDEBUG(DBG_I2C,"i2c bus for %s registered", adap->name);
	220
	221	return 0;
	222	}
	223
483dfdb6 TM	224	/* ----------------------------------------------------------------------- */
	225	/* usbvision specific I2C functions */
	226	/* ----------------------------------------------------------------------- */
	227	static struct i2c_adapter i2c_adap_template;
483dfdb6 TM	228	static struct i2c_client i2c_client_template;
483dfdb6 TM	229
1ff16c20	230	int usbvision_i2c_register(struct usb_usbvision *usbvision)
483dfdb6	231	{
bf8b20e1 TM	232	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
	233	sizeof(struct i2c_adapter));
	234	memcpy(&usbvision->i2c_client, &i2c_client_template,
	235	sizeof(struct i2c_client));
483dfdb6	236
1ff16c20 TM	237	sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
1ff16c20 TM	238	" #%d", usbvision->vdev->minor & 0x1f);
bf8b20e1 TM	239	PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
	240	usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
	241
	242	i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
	243	i2c_set_clientdata(&usbvision->i2c_client, usbvision);
1ff16c20	244
483dfdb6 TM	245	usbvision->i2c_client.adapter = &usbvision->i2c_adap;
	246
	247	if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
bf8b20e1	248	printk(KERN_ERR "usbvision_register: can't write reg\n");
483dfdb6 TM	249	return -EBUSY;
	250	}
	251
	252	#ifdef CONFIG_MODULES
	253	/* Request the load of the i2c modules we need */
	254	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	255	case CODEC_SAA7113:
	256	request_module("saa7115");
	257	break;
	258	case CODEC_SAA7111:
	259	request_module("saa7115");
	260	break;
	261	}
	262	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
	263	request_module("tuner");
781aa1d1	264	}
781aa1d1 MCC	265	#endif
781aa1d1 MCC	266
bf8b20e1	267	return usbvision_i2c_usb_add_bus(&usbvision->i2c_adap);
1ff16c20 TM	268	}
	269
	270	int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
	271	{
	272
	273	i2c_del_adapter(&(usbvision->i2c_adap));
	274
	275	PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
	276
	277	return 0;
483dfdb6 TM	278	}
	279
	280	void call_i2c_clients(struct usb_usbvision *usbvision, unsigned int cmd,
	281	void *arg)
	282	{
483dfdb6 TM	283	i2c_clients_command(&usbvision->i2c_adap, cmd, arg);
	284	}
	285
	286	static int attach_inform(struct i2c_client *client)
	287	{
	288	struct usb_usbvision *usbvision;
	289
bf8b20e1 TM	290	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
bf8b20e1 TM	291
483dfdb6	292	switch (client->addr << 1) {
3153bd91 TP	293	case 0x42 << 1:
	294	case 0x43 << 1:
	295	case 0x4a << 1:
	296	case 0x4b << 1:
6284feaf	297	PDEBUG(DBG_I2C,"attach_inform: tda9887 detected.");
483dfdb6	298	break;
483dfdb6 TM	299	case 0x42:
	300	PDEBUG(DBG_I2C,"attach_inform: saa7114 detected.");
	301	break;
	302	case 0x4a:
	303	PDEBUG(DBG_I2C,"attach_inform: saa7113 detected.");
	304	break;
38284ba3 TM	305	case 0x48:
	306	PDEBUG(DBG_I2C,"attach_inform: saa7111 detected.");
	307	break;
483dfdb6 TM	308	case 0xa0:
	309	PDEBUG(DBG_I2C,"attach_inform: eeprom detected.");
	310	break;
	311
	312	default:
	313	{
	314	struct tuner_setup tun_setup;
	315
	316	PDEBUG(DBG_I2C,"attach inform: detected I2C address %x", client->addr << 1);
	317	usbvision->tuner_addr = client->addr;
	318
	319	if ((usbvision->have_tuner) && (usbvision->tuner_type != -1)) {
	320	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	321	tun_setup.type = usbvision->tuner_type;
	322	tun_setup.addr = usbvision->tuner_addr;
	323	call_i2c_clients(usbvision, TUNER_SET_TYPE_ADDR, &tun_setup);
	324	}
	325	}
	326	break;
	327	}
781aa1d1 MCC	328	return 0;
	329	}
	330
483dfdb6 TM	331	static int detach_inform(struct i2c_client *client)
	332	{
	333	struct usb_usbvision *usbvision;
	334
bf8b20e1	335	usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
483dfdb6	336
a1ed551c	337	PDEBUG(DBG_I2C,"usbvision[%d] detaches %s", usbvision->nr, client->name);
483dfdb6 TM	338	return 0;
	339	}
	340
	341	static int
	342	usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
	343	char *buf, short len)
	344	{
	345	int rc, retries;
	346
	347	for (retries = 5;;) {
	348	rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
	349	if (rc < 0)
	350	return rc;
	351
	352	/* Initiate byte read cycle */
	353	/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
	354	/* d3 0=Wr 1=Rd */
	355	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
	356	(len & 0x07) \| 0x18);
	357	if (rc < 0)
	358	return rc;
	359
	360	/* Test for Busy and ACK */
	361	do {
	362	/* USBVISION_SER_CONT -> d4 == 0 busy */
	363	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
	364	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
	365	if (rc < 0)
	366	return rc;
	367
	368	/* USBVISION_SER_CONT -> d5 == 1 Not ack */
	369	if ((rc & 0x20) == 0) /* Ack? */
	370	break;
	371
	372	/* I2C abort */
	373	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
	374	if (rc < 0)
	375	return rc;
	376
	377	if (--retries < 0)
	378	return -1;
	379	}
	380
	381	switch (len) {
	382	case 4:
	383	buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
	384	case 3:
	385	buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
	386	case 2:
	387	buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
	388	case 1:
	389	buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
	390	break;
	391	default:
	392	printk(KERN_ERR
	393	"usbvision_i2c_read_max4: buffer length > 4\n");
	394	}
	395
	396	if (i2c_debug & DBG_I2C) {
	397	int idx;
	398	for (idx = 0; idx < len; idx++) {
	399	PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
	400	}
	401	}
402	return len;
403	}
404
405
406	static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
407	unsigned char addr, const char *buf,
408	short len)
409	{
410	int rc, retries;
411	int i;
412	unsigned char value[6];
413	unsigned char ser_cont;
414
415	ser_cont = (len & 0x07) \| 0x10;
416
417	value[0] = addr;
418	value[1] = ser_cont;
419	for (i = 0; i < len; i++)
420	value[i + 2] = buf[i];
421
422	for (retries = 5;;) {
423	rc = usb_control_msg(usbvision->dev,
424	usb_sndctrlpipe(usbvision->dev, 1),
425	USBVISION_OP_CODE,
426	USB_DIR_OUT \| USB_TYPE_VENDOR \|
427	USB_RECIP_ENDPOINT, 0,
428	(__u16) USBVISION_SER_ADRS, value,
429	len + 2, HZ);
430
431	if (rc < 0)
432	return rc;
433
434	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
435	(len & 0x07) \| 0x10);
436	if (rc < 0)
437	return rc;
438
439	/* Test for Busy and ACK */
440	do {
441	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
442	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
443	if (rc < 0)
444	return rc;
445
446	if ((rc & 0x20) == 0) /* Ack? */
447	break;
448
449	/* I2C abort */
450	usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
451
452	if (--retries < 0)
453	return -1;
454
455	}
456
457	if (i2c_debug & DBG_I2C) {
458	int idx;
459	for (idx = 0; idx < len; idx++) {
460	PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
461	}
462	}
463	return len;
464	}
465
1ff16c20	466	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	467	short len)
	468	{
	469	char *bufPtr = buf;
	470	int retval;
	471	int wrcount = 0;
	472	int count;
	473	int maxLen = 4;
483dfdb6 TM	474
	475	while (len > 0) {
	476	count = (len > maxLen) ? maxLen : len;
	477	retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
	478	if (retval > 0) {
	479	len -= count;
	480	bufPtr += count;
	481	wrcount += count;
	482	} else
	483	return (retval < 0) ? retval : -EFAULT;
	484	}
	485	return wrcount;
	486	}
	487
1ff16c20	488	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	489	short len)
	490	{
	491	char temp[4];
	492	int retval, i;
	493	int rdcount = 0;
	494	int count;
483dfdb6 TM	495
	496	while (len > 0) {
	497	count = (len > 3) ? 4 : len;
	498	retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
	499	if (retval > 0) {
	500	for (i = 0; i < len; i++)
	501	buf[rdcount + i] = temp[i];
	502	len -= count;
	503	rdcount += count;
	504	} else
	505	return (retval < 0) ? retval : -EFAULT;
	506	}
	507	return rdcount;
	508	}
	509
483dfdb6 TM	510	static struct i2c_adapter i2c_adap_template = {
	511	.owner = THIS_MODULE,
	512	.name = "usbvision",
	513	.id = I2C_HW_B_BT848, /* FIXME */
483dfdb6 TM	514	.client_register = attach_inform,
483dfdb6 TM	515	.client_unregister = detach_inform,
483dfdb6	516	.class = I2C_CLASS_TV_ANALOG,
483dfdb6 TM	517	};
	518
	519	static struct i2c_client i2c_client_template = {
	520	.name = "usbvision internal",
	521	};
	522
483dfdb6 TM	523	/*
	524	* Overrides for Emacs so that we follow Linus's tabbing style.
	525	* ---------------------------------------------------------------------------
	526	* Local variables:
	527	* c-basic-offset: 8
	528	* End:
	529	*/