![Mauro Carvalho Chehab](/assets/img/avatar_default.png)
This patch adds usbvision into V4L/DVB HG tree. Usbvision driver is a GPL driver, made by: Joerg Heckenbach <joerg@heckenbach-aw.de> and Dwaine Garden <DwaineGarden@rogers.com> V4L2 migration made by: Thierry Merle <thierry.merle@free.fr> Kconfig/Makefile scripts by: Mauro Carvalho Chehab <mchehab@infradead.org> Signed-off-by: Joerg Heckenbach <joerg@heckenbach-aw.de> Signed-off-by: Dwaine Garden <dwainegarden@rogers.com> Signed-off-by: Thierry Merle <thierry.merle@free.fr> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
266 lines
6.3 KiB
C
266 lines
6.3 KiB
C
/*
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* I2C_ALGO_USB.C
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* i2c algorithm for USB-I2C Bridges
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*
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* Copyright (c) 1999-2005 Joerg Heckenbach <joerg@heckenbach-aw.de>
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* Dwaine Garden <dwainegarden@rogers.com>
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*
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* This module is part of usbvision driver project.
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* Updates to driver completed by Dwaine P. Garden
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/version.h>
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#include <linux/utsname.h>
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#include <linux/init.h>
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#include <asm/uaccess.h>
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#include <linux/ioport.h>
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#include <linux/errno.h>
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#include <linux/sched.h>
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#include <linux/usb.h>
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#include <linux/i2c.h>
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#include "usbvision-i2c.h"
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static int debug = 0;
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#if defined(module_param) // Showing parameters under SYSFS
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module_param (debug, int, 0444); // debug mode of the device driver
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#else
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MODULE_PARM(debug, "i"); // debug mode of the device driver
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#endif
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MODULE_AUTHOR("Joerg Heckenbach");
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MODULE_DESCRIPTION("I2C algorithm for USB-I2C-bridges");
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MODULE_LICENSE("GPL");
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static inline int try_write_address(struct i2c_adapter *i2c_adap,
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unsigned char addr, int retries)
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{
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struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
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void *data;
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int i, ret = -1;
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char buf[4];
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data = i2c_get_adapdata(i2c_adap);
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buf[0] = 0x00;
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for (i = 0; i <= retries; i++) {
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ret = (adap->outb(data, addr, buf, 1));
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if (ret == 1)
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break; /* success! */
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udelay(5 /*adap->udelay */ );
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if (i == retries) /* no success */
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break;
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udelay(adap->udelay);
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}
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if (debug) {
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if (i) {
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info("%s: Needed %d retries for address %#2x", __FUNCTION__, i, addr);
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info("%s: Maybe there's no device at this address", __FUNCTION__);
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}
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}
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return ret;
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}
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static inline int try_read_address(struct i2c_adapter *i2c_adap,
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unsigned char addr, int retries)
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{
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struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
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void *data;
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int i, ret = -1;
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char buf[4];
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data = i2c_get_adapdata(i2c_adap);
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for (i = 0; i <= retries; i++) {
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ret = (adap->inb(data, addr, buf, 1));
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if (ret == 1)
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break; /* success! */
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udelay(5 /*adap->udelay */ );
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if (i == retries) /* no success */
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break;
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udelay(adap->udelay);
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}
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if (debug) {
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if (i) {
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info("%s: Needed %d retries for address %#2x", __FUNCTION__, i, addr);
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info("%s: Maybe there's no device at this address", __FUNCTION__);
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}
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}
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return ret;
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}
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static inline int usb_find_address(struct i2c_adapter *i2c_adap,
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struct i2c_msg *msg, int retries,
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unsigned char *add)
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{
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unsigned short flags = msg->flags;
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unsigned char addr;
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int ret;
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if ((flags & I2C_M_TEN)) {
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/* a ten bit address */
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addr = 0xf0 | ((msg->addr >> 7) & 0x03);
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/* try extended address code... */
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ret = try_write_address(i2c_adap, addr, retries);
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if (ret != 1) {
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err("died at extended address code, while writing");
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return -EREMOTEIO;
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}
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add[0] = addr;
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if (flags & I2C_M_RD) {
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/* okay, now switch into reading mode */
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addr |= 0x01;
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ret = try_read_address(i2c_adap, addr, retries);
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if (ret != 1) {
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err("died at extended address code, while reading");
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return -EREMOTEIO;
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}
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}
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} else { /* normal 7bit address */
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addr = (msg->addr << 1);
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if (flags & I2C_M_RD)
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addr |= 1;
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if (flags & I2C_M_REV_DIR_ADDR)
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addr ^= 1;
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add[0] = addr;
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if (flags & I2C_M_RD)
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ret = try_read_address(i2c_adap, addr, retries);
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else
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ret = try_write_address(i2c_adap, addr, retries);
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if (ret != 1) {
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return -EREMOTEIO;
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}
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}
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return 0;
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}
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static int
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usb_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
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{
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struct i2c_msg *pmsg;
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struct i2c_algo_usb_data *adap = i2c_adap->algo_data;
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void *data;
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int i, ret;
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unsigned char addr;
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data = i2c_get_adapdata(i2c_adap);
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for (i = 0; i < num; i++) {
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pmsg = &msgs[i];
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ret = usb_find_address(i2c_adap, pmsg, i2c_adap->retries, &addr);
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if (ret != 0) {
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if (debug) {
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info("%s: got NAK from device, message #%d\n", __FUNCTION__, i);
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}
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return (ret < 0) ? ret : -EREMOTEIO;
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}
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if (pmsg->flags & I2C_M_RD) {
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/* read bytes into buffer */
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ret = (adap->inb(data, addr, pmsg->buf, pmsg->len));
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if (ret < pmsg->len) {
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return (ret < 0) ? ret : -EREMOTEIO;
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}
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} else {
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/* write bytes from buffer */
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ret = (adap->outb(data, addr, pmsg->buf, pmsg->len));
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if (ret < pmsg->len) {
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return (ret < 0) ? ret : -EREMOTEIO;
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}
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}
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}
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return num;
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}
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static int algo_control(struct i2c_adapter *adapter, unsigned int cmd, unsigned long arg)
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{
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return 0;
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}
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static u32 usb_func(struct i2c_adapter *adap)
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{
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return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR | I2C_FUNC_PROTOCOL_MANGLING;
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}
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/* -----exported algorithm data: ------------------------------------- */
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static struct i2c_algorithm i2c_usb_algo = {
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.master_xfer = usb_xfer,
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.smbus_xfer = NULL,
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.slave_send = NULL,
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.slave_recv = NULL,
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.algo_control = algo_control,
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.functionality = usb_func,
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};
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/*
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* registering functions to load algorithms at runtime
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*/
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int usbvision_i2c_usb_add_bus(struct i2c_adapter *adap)
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{
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/* register new adapter to i2c module... */
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adap->algo = &i2c_usb_algo;
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adap->timeout = 100; /* default values, should */
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adap->retries = 3; /* be replaced by defines */
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#ifdef MODULE
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 21)
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MOD_INC_USE_COUNT;
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#endif
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#endif
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i2c_add_adapter(adap);
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if (debug) {
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info("i2c bus for %s registered", adap->name);
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}
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return 0;
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}
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int usbvision_i2c_usb_del_bus(struct i2c_adapter *adap)
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{
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i2c_del_adapter(adap);
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if (debug) {
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info("i2c bus for %s unregistered", adap->name);
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}
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#ifdef MODULE
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 21)
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MOD_DEC_USE_COUNT;
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#endif
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#endif
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return 0;
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}
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EXPORT_SYMBOL(usbvision_i2c_usb_add_bus);
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EXPORT_SYMBOL(usbvision_i2c_usb_del_bus);
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