![Hans Verkuil](/assets/img/avatar_default.png)
In various places the stack was used to provide buffers for USB data, but this should be allocated memory. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
448 lines
12 KiB
C
448 lines
12 KiB
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/init.h>
|
|
#include <linux/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;
|
|
|
|
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_I2C | I2C_FUNC_SMBUS_EMUL;
|
|
}
|
|
|
|
/* -----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 };
|
|
|
|
if (usbvision->registered_i2c)
|
|
return 0;
|
|
|
|
usbvision->i2c_adap = i2c_adap_template;
|
|
|
|
sprintf(usbvision->i2c_adap.name, "%s-%d-%s", i2c_adap_template.name,
|
|
usbvision->dev->bus->busnum, usbvision->dev->devpath);
|
|
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_i2c_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->dev_model].codec) {
|
|
case CODEC_SAA7113:
|
|
case CODEC_SAA7111:
|
|
/* Without this delay the detection of the saa711x is
|
|
hit-and-miss. */
|
|
mdelay(10);
|
|
v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
|
|
&usbvision->i2c_adap,
|
|
"saa7115_auto", 0, saa711x_addrs);
|
|
break;
|
|
}
|
|
if (usbvision_device_data[usbvision->dev_model].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", 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", 0, v4l2_i2c_tuner_addrs(type));
|
|
|
|
if (sd == NULL)
|
|
return -ENODEV;
|
|
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);
|
|
}
|
|
}
|
|
usbvision->registered_i2c = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
|
|
{
|
|
if (!usbvision->registered_i2c)
|
|
return 0;
|
|
|
|
i2c_del_adapter(&(usbvision->i2c_adap));
|
|
usbvision->registered_i2c = 0;
|
|
|
|
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 = usbvision->ctrl_urb_buffer;
|
|
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 *buf_ptr = buf;
|
|
int retval;
|
|
int wrcount = 0;
|
|
int count;
|
|
int max_len = 4;
|
|
|
|
while (len > 0) {
|
|
count = (len > max_len) ? max_len : len;
|
|
retval = usbvision_i2c_write_max4(usbvision, addr, buf_ptr, count);
|
|
if (retval > 0) {
|
|
len -= count;
|
|
buf_ptr += 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",
|
|
};
|