482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* usbvision_i2c.c
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* i2c algorithm for USB-I2C Bridges
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*
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* Copyright (c) 1999-2007 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/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/usb.h>
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#include <linux/i2c.h>
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#include "usbvision.h"
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#define DBG_I2C 1<<0
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static int i2c_debug;
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module_param (i2c_debug, int, 0644); // debug_i2c_usb mode of the device driver
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MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
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#define PDEBUG(level, fmt, args...) { \
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if (i2c_debug & (level)) \
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printk(KERN_INFO KBUILD_MODNAME ":[%s:%d] " fmt, \
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__func__, __LINE__ , ## args); \
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}
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static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len);
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static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len);
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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 usb_usbvision *usbvision;
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int i, ret = -1;
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char buf[4];
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usbvision = (struct usb_usbvision *)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 = (usbvision_i2c_write(usbvision, addr, buf, 1));
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if (ret == 1)
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break; /* success! */
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udelay(5);
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if (i == retries) /* no success */
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break;
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udelay(10);
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}
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if (i) {
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PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
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PDEBUG(DBG_I2C,"Maybe there's no device at this address");
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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 usb_usbvision *usbvision;
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int i, ret = -1;
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char buf[4];
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usbvision = (struct usb_usbvision *)i2c_get_adapdata(i2c_adap);
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for (i = 0; i <= retries; i++) {
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ret = (usbvision_i2c_read(usbvision, addr, buf, 1));
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if (ret == 1)
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break; /* success! */
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udelay(5);
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if (i == retries) /* no success */
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break;
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udelay(10);
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}
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if (i) {
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PDEBUG(DBG_I2C,"Needed %d retries for address %#2x", i, addr);
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PDEBUG(DBG_I2C,"Maybe there's no device at this address");
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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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dev_err(&i2c_adap->dev,
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"died at extended address code, while writing\n");
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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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dev_err(&i2c_adap->dev,
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"died at extended address code, while reading\n");
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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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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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usbvision_i2c_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 usb_usbvision *usbvision;
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int i, ret;
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unsigned char addr = 0;
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usbvision = (struct usb_usbvision *)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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PDEBUG(DBG_I2C,"got NAK from device, message #%d", i);
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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 = (usbvision_i2c_read(usbvision, 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 = (usbvision_i2c_write(usbvision, 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 u32 functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR;
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}
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/* -----exported algorithm data: ------------------------------------- */
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static struct i2c_algorithm usbvision_algo = {
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.master_xfer = usbvision_i2c_xfer,
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.smbus_xfer = NULL,
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.functionality = functionality,
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};
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/* ----------------------------------------------------------------------- */
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/* usbvision specific I2C functions */
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/* ----------------------------------------------------------------------- */
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static struct i2c_adapter i2c_adap_template;
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int usbvision_i2c_register(struct usb_usbvision *usbvision)
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{
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static unsigned short saa711x_addrs[] = {
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0x4a >> 1, 0x48 >> 1, /* SAA7111, SAA7111A and SAA7113 */
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0x42 >> 1, 0x40 >> 1, /* SAA7114, SAA7115 and SAA7118 */
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I2C_CLIENT_END };
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if (usbvision->registered_i2c)
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return 0;
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memcpy(&usbvision->i2c_adap, &i2c_adap_template,
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sizeof(struct i2c_adapter));
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sprintf(usbvision->i2c_adap.name, "%s-%d-%s", i2c_adap_template.name,
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usbvision->dev->bus->busnum, usbvision->dev->devpath);
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PDEBUG(DBG_I2C,"Adaptername: %s", usbvision->i2c_adap.name);
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usbvision->i2c_adap.dev.parent = &usbvision->dev->dev;
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i2c_set_adapdata(&usbvision->i2c_adap, &usbvision->v4l2_dev);
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if (usbvision_write_reg(usbvision, USBVISION_SER_MODE, USBVISION_IIC_LRNACK) < 0) {
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printk(KERN_ERR "usbvision_register: can't write reg\n");
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return -EBUSY;
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}
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PDEBUG(DBG_I2C, "I2C debugging is enabled [i2c]");
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PDEBUG(DBG_I2C, "ALGO debugging is enabled [i2c]");
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/* register new adapter to i2c module... */
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usbvision->i2c_adap.algo = &usbvision_algo;
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usbvision->i2c_adap.timeout = 100; /* default values, should */
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usbvision->i2c_adap.retries = 3; /* be replaced by defines */
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i2c_add_adapter(&usbvision->i2c_adap);
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PDEBUG(DBG_I2C, "i2c bus for %s registered", usbvision->i2c_adap.name);
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/* Request the load of the i2c modules we need */
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switch (usbvision_device_data[usbvision->DevModel].Codec) {
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case CODEC_SAA7113:
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case CODEC_SAA7111:
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/* Without this delay the detection of the saa711x is
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hit-and-miss. */
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mdelay(10);
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v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
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&usbvision->i2c_adap,
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"saa7115_auto", 0, saa711x_addrs);
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break;
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}
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if (usbvision_device_data[usbvision->DevModel].Tuner == 1) {
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struct v4l2_subdev *sd;
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enum v4l2_i2c_tuner_type type;
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struct tuner_setup tun_setup;
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sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
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&usbvision->i2c_adap,
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"tuner", 0, v4l2_i2c_tuner_addrs(ADDRS_DEMOD));
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/* depending on whether we found a demod or not, select
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the tuner type. */
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type = sd ? ADDRS_TV_WITH_DEMOD : ADDRS_TV;
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sd = v4l2_i2c_new_subdev(&usbvision->v4l2_dev,
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&usbvision->i2c_adap,
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"tuner", 0, v4l2_i2c_tuner_addrs(type));
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if (sd == NULL)
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return -ENODEV;
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if (usbvision->tuner_type != -1) {
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tun_setup.mode_mask = T_ANALOG_TV | T_RADIO;
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tun_setup.type = usbvision->tuner_type;
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tun_setup.addr = v4l2_i2c_subdev_addr(sd);
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call_all(usbvision, tuner, s_type_addr, &tun_setup);
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}
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}
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usbvision->registered_i2c = 1;
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return 0;
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}
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int usbvision_i2c_unregister(struct usb_usbvision *usbvision)
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{
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if (!usbvision->registered_i2c)
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return 0;
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i2c_del_adapter(&(usbvision->i2c_adap));
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usbvision->registered_i2c = 0;
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PDEBUG(DBG_I2C,"i2c bus for %s unregistered", usbvision->i2c_adap.name);
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return 0;
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}
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static int
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usbvision_i2c_read_max4(struct usb_usbvision *usbvision, unsigned char addr,
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char *buf, short len)
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{
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int rc, retries;
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for (retries = 5;;) {
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rc = usbvision_write_reg(usbvision, USBVISION_SER_ADRS, addr);
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if (rc < 0)
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return rc;
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/* Initiate byte read cycle */
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/* USBVISION_SER_CONT <- d0-d2 n. of bytes to r/w */
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/* d3 0=Wr 1=Rd */
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rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
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(len & 0x07) | 0x18);
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if (rc < 0)
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return rc;
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/* Test for Busy and ACK */
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do {
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/* USBVISION_SER_CONT -> d4 == 0 busy */
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rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
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} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
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if (rc < 0)
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return rc;
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/* USBVISION_SER_CONT -> d5 == 1 Not ack */
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if ((rc & 0x20) == 0) /* Ack? */
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break;
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/* I2C abort */
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rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
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if (rc < 0)
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return rc;
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if (--retries < 0)
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return -1;
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}
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switch (len) {
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case 4:
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buf[3] = usbvision_read_reg(usbvision, USBVISION_SER_DAT4);
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case 3:
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buf[2] = usbvision_read_reg(usbvision, USBVISION_SER_DAT3);
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case 2:
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buf[1] = usbvision_read_reg(usbvision, USBVISION_SER_DAT2);
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case 1:
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buf[0] = usbvision_read_reg(usbvision, USBVISION_SER_DAT1);
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break;
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default:
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printk(KERN_ERR
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"usbvision_i2c_read_max4: buffer length > 4\n");
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}
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if (i2c_debug & DBG_I2C) {
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int idx;
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for (idx = 0; idx < len; idx++) {
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PDEBUG(DBG_I2C,"read %x from address %x", (unsigned char)buf[idx], addr);
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}
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}
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return len;
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}
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static int usbvision_i2c_write_max4(struct usb_usbvision *usbvision,
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unsigned char addr, const char *buf,
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short len)
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{
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int rc, retries;
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int i;
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unsigned char value[6];
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unsigned char ser_cont;
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ser_cont = (len & 0x07) | 0x10;
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value[0] = addr;
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value[1] = ser_cont;
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for (i = 0; i < len; i++)
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value[i + 2] = buf[i];
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for (retries = 5;;) {
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rc = usb_control_msg(usbvision->dev,
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usb_sndctrlpipe(usbvision->dev, 1),
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USBVISION_OP_CODE,
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USB_DIR_OUT | USB_TYPE_VENDOR |
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USB_RECIP_ENDPOINT, 0,
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(__u16) USBVISION_SER_ADRS, value,
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len + 2, HZ);
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if (rc < 0)
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return rc;
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rc = usbvision_write_reg(usbvision, USBVISION_SER_CONT,
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(len & 0x07) | 0x10);
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if (rc < 0)
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return rc;
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/* Test for Busy and ACK */
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do {
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rc = usbvision_read_reg(usbvision, USBVISION_SER_CONT);
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} while (rc > 0 && ((rc & 0x10) != 0)); /* Retry while busy */
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if (rc < 0)
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return rc;
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if ((rc & 0x20) == 0) /* Ack? */
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break;
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/* I2C abort */
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usbvision_write_reg(usbvision, USBVISION_SER_CONT, 0x00);
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if (--retries < 0)
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return -1;
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}
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if (i2c_debug & DBG_I2C) {
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int idx;
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for (idx = 0; idx < len; idx++) {
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PDEBUG(DBG_I2C,"wrote %x at address %x", (unsigned char)buf[idx], addr);
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}
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}
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return len;
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}
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static int usbvision_i2c_write(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len)
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{
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char *bufPtr = buf;
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int retval;
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int wrcount = 0;
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int count;
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int maxLen = 4;
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while (len > 0) {
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count = (len > maxLen) ? maxLen : len;
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retval = usbvision_i2c_write_max4(usbvision, addr, bufPtr, count);
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if (retval > 0) {
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len -= count;
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bufPtr += count;
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wrcount += count;
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} else
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return (retval < 0) ? retval : -EFAULT;
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}
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return wrcount;
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}
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static int usbvision_i2c_read(struct usb_usbvision *usbvision, unsigned char addr, char *buf,
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short len)
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{
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char temp[4];
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int retval, i;
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int rdcount = 0;
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int count;
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while (len > 0) {
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count = (len > 3) ? 4 : len;
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retval = usbvision_i2c_read_max4(usbvision, addr, temp, count);
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if (retval > 0) {
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for (i = 0; i < len; i++)
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buf[rdcount + i] = temp[i];
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len -= count;
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rdcount += count;
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} else
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return (retval < 0) ? retval : -EFAULT;
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}
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return rdcount;
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}
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static struct i2c_adapter i2c_adap_template = {
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.owner = THIS_MODULE,
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.name = "usbvision",
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};
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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