![Thierry MERLE](/assets/img/avatar_default.png)
- removal of overlay stuff - reorganization of functions in 3 files: * usbvision-i2c for I2C-related stuff * usbvision-video for v4l2 entry points * usbvision-core for all peripheral controls and utilities Signed-off-by: Thierry MERLE <thierry.merle@free.fr> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
572 lines
14 KiB
C
572 lines
14 KiB
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/sched.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 inline int try_write_address(struct i2c_adapter *i2c_adap,
|
|
unsigned char addr, int retries)
|
|
{
|
|
struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
|
|
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 = (adap->outb(data, addr, buf, 1));
|
|
if (ret == 1)
|
|
break; /* success! */
|
|
udelay(5 /*adap->udelay */ );
|
|
if (i == retries) /* no success */
|
|
break;
|
|
udelay(adap->udelay);
|
|
}
|
|
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)
|
|
{
|
|
struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
|
|
void *data;
|
|
int i, ret = -1;
|
|
char buf[4];
|
|
|
|
data = i2c_get_adapdata(i2c_adap);
|
|
for (i = 0; i <= retries; i++) {
|
|
ret = (adap->inb(data, addr, buf, 1));
|
|
if (ret == 1)
|
|
break; /* success! */
|
|
udelay(5 /*adap->udelay */ );
|
|
if (i == retries) /* no success */
|
|
break;
|
|
udelay(adap->udelay);
|
|
}
|
|
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;
|
|
struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
|
|
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 = (adap->inb(data, addr, pmsg->buf, pmsg->len));
|
|
if (ret < pmsg->len) {
|
|
return (ret < 0) ? ret : -EREMOTEIO;
|
|
}
|
|
} else {
|
|
/* write bytes from buffer */
|
|
ret = (adap->outb(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
|
|
*/
|
|
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_algo_usb_data i2c_algo_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_algo, &i2c_algo_template,
|
|
sizeof(struct i2c_algo_usb_data));
|
|
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);
|
|
|
|
i2c_set_adapdata(&usbvision->i2c_adap, usbvision);
|
|
i2c_set_clientdata(&usbvision->i2c_client, usbvision);
|
|
i2c_set_algo_usb_data(&usbvision->i2c_algo, usbvision);
|
|
|
|
usbvision->i2c_adap.algo_data = &usbvision->i2c_algo;
|
|
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)
|
|
{
|
|
BUG_ON(NULL == usbvision->i2c_adap.algo_data);
|
|
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 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;
|
|
|
|
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
|
|
usbvision = (struct usb_usbvision *)client->adapter->data;
|
|
#else
|
|
usbvision = (struct usb_usbvision *)i2c_get_adapdata(client->adapter);
|
|
#endif
|
|
|
|
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_algo_usb_data i2c_algo_template = {
|
|
.data = NULL,
|
|
.inb = usbvision_i2c_read,
|
|
.outb = usbvision_i2c_write,
|
|
.udelay = 10,
|
|
.mdelay = 10,
|
|
.timeout = 100,
|
|
};
|
|
|
|
static struct i2c_adapter i2c_adap_template = {
|
|
.owner = THIS_MODULE,
|
|
.name = "usbvision",
|
|
.id = I2C_HW_B_BT848, /* FIXME */
|
|
.algo = NULL,
|
|
.algo_data = NULL,
|
|
.client_register = attach_inform,
|
|
.client_unregister = detach_inform,
|
|
#if defined (I2C_ADAP_CLASS_TV_ANALOG)
|
|
.class = I2C_ADAP_CLASS_TV_ANALOG,
|
|
#elif defined (I2C_CLASS_TV_ANALOG)
|
|
.class = I2C_CLASS_TV_ANALOG,
|
|
#endif
|
|
};
|
|
|
|
static struct i2c_client i2c_client_template = {
|
|
.name = "usbvision internal",
|
|
};
|
|
|
|
EXPORT_SYMBOL(usbvision_i2c_usb_add_bus);
|
|
EXPORT_SYMBOL(usbvision_i2c_usb_del_bus);
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|