[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/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)) \
			printk(KERN_INFO KBUILD_MODNAME ":[%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) {
			dev_err(&i2c_adap->dev,
				"died at extended address code,	while writing\n");
			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) {
				dev_err(&i2c_adap->dev,
					"died at extended address code, while reading\n");
				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 = 0;

	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,
};


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

int usbvision_i2c_register(struct usb_usbvision *usbvision)
{
	static unsigned short saa711x_addrs[] = {
		0x4a >> 1, 0x48 >> 1,	/* SAA7111, SAA7111A and SAA7113 */
		0x42 >> 1, 0x40 >> 1,	/* SAA7114, SAA7115 and SAA7118 */
		I2C_CLIENT_END };

	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
	       sizeof(struct i2c_adapter));

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

	i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev);

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

	PDEBUG(DBG_I2C, "I2C   debugging is enabled [i2c]");
	PDEBUG(DBG_I2C, "ALGO   debugging is enabled [i2c]");

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

	usbvision->i2c_adap.algo = &usbvision_algo;

	usbvision->i2c_adap.timeout = 100;	/* default values, should       */
	usbvision->i2c_adap.retries = 3;	/* be replaced by defines       */

	i2c_add_adapter(&usbvision->i2c_adap);

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

	/* Request the load of the i2c modules we need */
	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	case CODEC_SAA7113:
	case CODEC_SAA7111:
		v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
				&usbvision->i2c_adap, "saa7115",
				"saa7115_auto", 0, saa711x_addrs);
		break;
	}
	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
		struct v4l2_subdev *sd;
		enum v4l2_i2c_tuner_type type;
		struct tuner_setup tun_setup;

		sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
				&usbvision->i2c_adap, "tuner",
				"tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
		/* depending on whether we found a demod or not, select
		   the tuner type. */
		type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;

		sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
				&usbvision->i2c_adap, "tuner",
				"tuner", 0, v4l2_i2c_tuner_addrs(type));

		if (usbvision->tuner_type != -1) {
			tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
			tun_setup.type = usbvision->tuner_type;
			tun_setup.addr = v4l2_i2c_subdev_addr(sd);
			call_all(usbvision, tuner, s_type_addr, &tun_setup);
		}
	}

	return 0;
}

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;
}

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",
};

/*
 * 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>
781aa1d1 MCC	31	#include <linux/init.h>
	32	#include <asm/uaccess.h>
	33	#include <linux/ioport.h>
	34	#include <linux/errno.h>
781aa1d1 MCC	35	#include <linux/usb.h>
781aa1d1 MCC	36	#include <linux/i2c.h>
483dfdb6	37	#include "usbvision.h"
781aa1d1	38
483dfdb6	39	#define DBG_I2C 1<<0
781aa1d1	40
ff699e6b	41	static int i2c_debug;
483dfdb6 TM	42
	43	module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
	44	MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
781aa1d1	45
df18c319 TM	46	#define PDEBUG(level, fmt, args...) { \
df18c319 TM	47	if (i2c_debug & (level)) \
a482f327 GKH	48	printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
a482f327 GKH	49	__func__, __LINE__ , ## args); \
df18c319	50	}
781aa1d1	51
1ff16c20	52	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26	53	short len);
1ff16c20	54	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
2a7e9a26 MCC	55	short len);
2a7e9a26 MCC	56
781aa1d1 MCC	57	static inline int try_write_address(struct i2c_adapter *i2c_adap,
	58	unsigned char addr, int retries)
	59	{
1ff16c20	60	struct usb_usbvision *usbvision;
781aa1d1 MCC	61	int i, ret = -1;
	62	char buf[4];
	63
bf8b20e1	64	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1 MCC	65	buf[0] = 0x00;
781aa1d1 MCC	66	for (i = 0; i <= retries; i++) {
1ff16c20	67	ret = (usbvision_i2c_write(usbvision, 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	75	if (i) {
1ff16c20 TM	76	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	77	PDEBUG(DBG_I2C,"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	{
1ff16c20	85	struct usb_usbvision *usbvision;
781aa1d1 MCC	86	int i, ret = -1;
	87	char buf[4];
	88
bf8b20e1	89	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
781aa1d1	90	for (i = 0; i <= retries; i++) {
1ff16c20	91	ret = (usbvision_i2c_read(usbvision, 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	99	if (i) {
1ff16c20 TM	100	PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
1ff16c20 TM	101	PDEBUG(DBG_I2C,"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) {
be9ed511 MCC	120	dev_err(&i2c_adap->dev,
be9ed511 MCC	121	"died at extended address code, while writing\n");
781aa1d1 MCC	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) {
be9ed511 MCC	130	dev_err(&i2c_adap->dev,
be9ed511 MCC	131	"died at extended address code, while reading\n");
781aa1d1 MCC	132	return -EREMOTEIO;
	133	}
	134	}
	135
	136	} else { /* normal 7bit address */
	137	addr = (msg->addr << 1);
	138	if (flags & I2C_M_RD)
	139	addr \|= 1;
781aa1d1 MCC	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
1ff16c20	155	usbvision_i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
781aa1d1 MCC	156	{
781aa1d1 MCC	157	struct i2c_msg *pmsg;
1ff16c20	158	struct usb_usbvision *usbvision;
781aa1d1	159	int i, ret;
cf8e193a	160	unsigned char addr = 0;
781aa1d1	161
bf8b20e1 TM	162	usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
bf8b20e1 TM	163
781aa1d1 MCC	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) {
1ff16c20	168	PDEBUG(DBG_I2C,"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 */
1ff16c20	174	ret = (usbvision_i2c_read(usbvision, 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 */
1ff16c20	180	ret = (usbvision_i2c_write(usbvision, 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
1ff16c20	189	static u32 functionality(struct i2c_adapter *adap)
781aa1d1	190	{
39f46ade	191	return I2C_FUNC_SMBUS_EMUL \| I2C_FUNC_10BIT_ADDR;
781aa1d1 MCC	192	}
781aa1d1 MCC	193
781aa1d1 MCC	194	/* -----exported algorithm data: ------------------------------------- */
781aa1d1 MCC	195
1ff16c20 TM	196	static struct i2c_algorithm usbvision_algo = {
1ff16c20 TM	197	.master_xfer = usbvision_i2c_xfer,
781aa1d1	198	.smbus_xfer = NULL,
1ff16c20	199	.functionality = functionality,
781aa1d1 MCC	200	};
	201
	202
483dfdb6 TM	203	/* ----------------------------------------------------------------------- */
	204	/* usbvision specific I2C functions */
	205	/* ----------------------------------------------------------------------- */
	206	static struct i2c_adapter i2c_adap_template;
483dfdb6	207
1ff16c20	208	int usbvision_i2c_register(struct usb_usbvision *usbvision)
483dfdb6	209	{
1df79537 HV	210	static unsigned short saa711x_addrs[] = {
	211	0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */
	212	0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */
	213	I2C_CLIENT_END };
	214
bf8b20e1 TM	215	memcpy(&usbvision->i2c_adap, &i2c_adap_template,
bf8b20e1 TM	216	sizeof(struct i2c_adapter));
483dfdb6	217
1ff16c20	218	sprintf(usbvision->i2c_adap.name + strlen(usbvision->i2c_adap.name),
c6330fb8	219	" #%d", usbvision->vdev->num);
bf8b20e1 TM	220	PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
	221	usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
	222
1df79537	223	i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev);
483dfdb6 TM	224
483dfdb6 TM	225	if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
bf8b20e1	226	printk(KERN_ERR "usbvision_register: can't write reg\n");
483dfdb6 TM	227	return -EBUSY;
	228	}
	229
1df79537 HV	230	PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
	231	PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
	232
	233	/* register new adapter to i2c module... */
	234
	235	usbvision->i2c_adap.algo = &usbvision_algo;
	236
	237	usbvision->i2c_adap.timeout = 100; /* default values, should */
	238	usbvision->i2c_adap.retries = 3; /* be replaced by defines */
	239
	240	i2c_add_adapter(&usbvision->i2c_adap);
	241
	242	PDEBUG(DBG_I2C, "i2c bus for %s registered", usbvision->i2c_adap.name);
	243
483dfdb6 TM	244	/* Request the load of the i2c modules we need */
	245	switch (usbvision_device_data[usbvision->DevModel].Codec) {
	246	case CODEC_SAA7113:
483dfdb6	247	case CODEC_SAA7111:
53dacb15	248	v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
e6574f2f	249	&usbvision->i2c_adap, "saa7115",
53dacb15	250	"saa7115_auto", 0, saa711x_addrs);
483dfdb6 TM	251	break;
	252	}
	253	if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
1df79537 HV	254	struct v4l2_subdev *sd;
	255	enum v4l2_i2c_tuner_type type;
	256	struct tuner_setup tun_setup;
	257
53dacb15	258	sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
e6574f2f	259	&usbvision->i2c_adap, "tuner",
53dacb15	260	"tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
1df79537 HV	261	/* depending on whether we found a demod or not, select
	262	the tuner type. */
	263	type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
	264
53dacb15	265	sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
e6574f2f	266	&usbvision->i2c_adap, "tuner",
53dacb15	267	"tuner", 0, v4l2_i2c_tuner_addrs(type));
1df79537 HV	268
	269	if (usbvision->tuner_type != -1) {
	270	tun_setup.mode_mask = T_ANALOG_TV \| T_RADIO;
	271	tun_setup.type = usbvision->tuner_type;
	272	tun_setup.addr = v4l2_i2c_subdev_addr(sd);
	273	call_all(usbvision, tuner, s_type_addr, &tun_setup);
	274	}
781aa1d1	275	}
781aa1d1	276
1df79537	277	return 0;
1ff16c20 TM	278	}
	279
	280	int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
	281	{
	282
	283	i2c_del_adapter(&(usbvision->i2c_adap));
	284
	285	PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
	286
	287	return 0;
483dfdb6 TM	288	}
483dfdb6 TM	289
483dfdb6 TM	290	static int
	291	usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
	292	char *buf, short len)
	293	{
	294	int rc, retries;
	295
	296	for (retries = 5;;) {
	297	rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
	298	if (rc < 0)
	299	return rc;
	300
	301	/* Initiate byte read cycle */
	302	/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
	303	/* d3 0=Wr 1=Rd */
	304	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
	305	(len & 0x07) \| 0x18);
	306	if (rc < 0)
	307	return rc;
	308
	309	/* Test for Busy and ACK */
	310	do {
	311	/* USBVISION_SER_CONT -> d4 == 0 busy */
	312	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
	313	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
	314	if (rc < 0)
	315	return rc;
	316
	317	/* USBVISION_SER_CONT -> d5 == 1 Not ack */
	318	if ((rc & 0x20) == 0) /* Ack? */
	319	break;
	320
	321	/* I2C abort */
	322	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
	323	if (rc < 0)
	324	return rc;
	325
	326	if (--retries < 0)
	327	return -1;
	328	}
	329
	330	switch (len) {
	331	case 4:
	332	buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
	333	case 3:
	334	buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
	335	case 2:
	336	buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
	337	case 1:
	338	buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
	339	break;
	340	default:
	341	printk(KERN_ERR
	342	"usbvision_i2c_read_max4: buffer length > 4\n");
	343	}
	344
	345	if (i2c_debug & DBG_I2C) {
	346	int idx;
	347	for (idx = 0; idx < len; idx++) {
	348	PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
	349	}
	350	}
	351	return len;
	352	}
	353
354
355	static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
356	unsigned char addr, const char *buf,
357	short len)
358	{
359	int rc, retries;
360	int i;
361	unsigned char value[6];
362	unsigned char ser_cont;
363
364	ser_cont = (len & 0x07) \| 0x10;
365
366	value[0] = addr;
367	value[1] = ser_cont;
368	for (i = 0; i < len; i++)
369	value[i + 2] = buf[i];
370
371	for (retries = 5;;) {
372	rc = usb_control_msg(usbvision->dev,
373	usb_sndctrlpipe(usbvision->dev, 1),
374	USBVISION_OP_CODE,
375	USB_DIR_OUT \| USB_TYPE_VENDOR \|
376	USB_RECIP_ENDPOINT, 0,
377	(__u16) USBVISION_SER_ADRS, value,
378	len + 2, HZ);
379
380	if (rc < 0)
381	return rc;
382
383	rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
384	(len & 0x07) \| 0x10);
385	if (rc < 0)
386	return rc;
387
388	/* Test for Busy and ACK */
389	do {
390	rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
391	} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
392	if (rc < 0)
393	return rc;
394
395	if ((rc & 0x20) == 0) /* Ack? */
396	break;
397
398	/* I2C abort */
399	usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
400
401	if (--retries < 0)
402	return -1;
403
404	}
405
406	if (i2c_debug & DBG_I2C) {
407	int idx;
408	for (idx = 0; idx < len; idx++) {
409	PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
410	}
411	}
412	return len;
413	}
414
1ff16c20	415	static int usbvision_i2c_write(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	416	short len)
	417	{
	418	char *bufPtr = buf;
	419	int retval;
	420	int wrcount = 0;
	421	int count;
	422	int maxLen = 4;
483dfdb6 TM	423
	424	while (len > 0) {
	425	count = (len > maxLen) ? maxLen : len;
	426	retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
	427	if (retval > 0) {
	428	len -= count;
	429	bufPtr += count;
	430	wrcount += count;
	431	} else
	432	return (retval < 0) ? retval : -EFAULT;
	433	}
	434	return wrcount;
	435	}
	436
1ff16c20	437	static int usbvision_i2c_read(struct usb_usbvision usbvision, unsigned char addr, char buf,
483dfdb6 TM	438	short len)
	439	{
	440	char temp[4];
	441	int retval, i;
	442	int rdcount = 0;
	443	int count;
483dfdb6 TM	444
	445	while (len > 0) {
	446	count = (len > 3) ? 4 : len;
	447	retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
	448	if (retval > 0) {
	449	for (i = 0; i < len; i++)
	450	buf[rdcount + i] = temp[i];
	451	len -= count;
	452	rdcount += count;
	453	} else
	454	return (retval < 0) ? retval : -EFAULT;
	455	}
	456	return rdcount;
	457	}
	458
483dfdb6 TM	459	static struct i2c_adapter i2c_adap_template = {
	460	.owner = THIS_MODULE,
	461	.name = "usbvision",
483dfdb6 TM	462	};
483dfdb6 TM	463
483dfdb6 TM	464	/*
	465	* Overrides for Emacs so that we follow Linus's tabbing style.
	466	* ---------------------------------------------------------------------------
	467	* Local variables:
	468	* c-basic-offset: 8
	469	* End:
	470	*/