Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
//
// em28xx-i2c.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
//
// Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
//		      Markus Rechberger <mrechberger@gmail.com>
//		      Mauro Carvalho Chehab <mchehab@kernel.org>
//		      Sascha Sommer <saschasommer@freenet.de>
// Copyright (C) 2013 Frank Schäfer <fschaefer.oss@googlemail.com>
//
// 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.
 
#include "em28xx.h"
 
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/usb.h>
#include <linux/i2c.h>
#include <linux/jiffies.h>
 
#include "tuner-xc2028.h"
#include <media/v4l2-common.h>
#include <media/tuner.h>
 
/* ----------------------------------------------------------- */
 
static unsigned int i2c_scan;
module_param(i2c_scan, int, 0444);
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
 
static unsigned int i2c_debug;
module_param(i2c_debug, int, 0644);
MODULE_PARM_DESC(i2c_debug, "i2c debug message level (1: normal debug, 2: show I2C transfers)");
 
#define dprintk(level, fmt, arg...) do {				\
<------>if (i2c_debug > level)						\
<------><------>dev_printk(KERN_DEBUG, &dev->intf->dev,			\
<------><------><------>   "i2c: %s: " fmt, __func__, ## arg);		\
} while (0)
 
/*
 * Time in msecs to wait for i2c xfers to finish.
 * 35ms is the maximum time a SMBUS device could wait when
 * clock stretching is used. As the transfer itself will take
 * some time to happen, set it to 35 ms.
 *
 * Ok, I2C doesn't specify any limit. So, eventually, we may need
 * to increase this timeout.
 */
#define EM28XX_I2C_XFER_TIMEOUT         35 /* ms */
 
static int em28xx_i2c_timeout(struct em28xx *dev)
{
<------>int time = EM28XX_I2C_XFER_TIMEOUT;
 
<------>switch (dev->i2c_speed & 0x03) {
<------>case EM28XX_I2C_FREQ_25_KHZ:
<------><------>time += 4;		/* Assume 4 ms for transfers */
<------><------>break;
<------>case EM28XX_I2C_FREQ_100_KHZ:
<------>case EM28XX_I2C_FREQ_400_KHZ:
<------><------>time += 1;		/* Assume 1 ms for transfers */
<------><------>break;
<------>default: /* EM28XX_I2C_FREQ_1_5_MHZ */
<------><------>break;
<------>}
 
<------>return msecs_to_jiffies(time);
}
 
/*
 * em2800_i2c_send_bytes()
 * send up to 4 bytes to the em2800 i2c device
 */
static int em2800_i2c_send_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
{
<------>unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
<------>int ret;
<------>u8 b2[6];
 
<------>if (len < 1 || len > 4)
<------><------>return -EOPNOTSUPP;
 
<------>b2[5] = 0x80 + len - 1;
<------>b2[4] = addr;
<------>b2[3] = buf[0];
<------>if (len > 1)
<------><------>b2[2] = buf[1];
<------>if (len > 2)
<------><------>b2[1] = buf[2];
<------>if (len > 3)
<------><------>b2[0] = buf[3];
 
<------>/* trigger write */
<------>ret = dev->em28xx_write_regs(dev, 4 - len, &b2[4 - len], 2 + len);
<------>if (ret != 2 + len) {
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "failed to trigger write to i2c address 0x%x (error=%i)\n",
<------><------><------>    addr, ret);
<------><------>return (ret < 0) ? ret : -EIO;
<------>}
<------>/* wait for completion */
<------>while (time_is_after_jiffies(timeout)) {
<------><------>ret = dev->em28xx_read_reg(dev, 0x05);
<------><------>if (ret == 0x80 + len - 1)
<------><------><------>return len;
<------><------>if (ret == 0x94 + len - 1) {
<------><------><------>dprintk(1, "R05 returned 0x%02x: I2C ACK error\n", ret);
<------><------><------>return -ENXIO;
<------><------>}
<------><------>if (ret < 0) {
<------><------><------>dev_warn(&dev->intf->dev,
<------><------><------><------> "failed to get i2c transfer status from bridge register (error=%i)\n",
<------><------><------><------>ret);
<------><------><------>return ret;
<------><------>}
<------><------>usleep_range(5000, 6000);
<------>}
<------>dprintk(0, "write to i2c device at 0x%x timed out\n", addr);
<------>return -ETIMEDOUT;
}
 
/*
 * em2800_i2c_recv_bytes()
 * read up to 4 bytes from the em2800 i2c device
 */
static int em2800_i2c_recv_bytes(struct em28xx *dev, u8 addr, u8 *buf, u16 len)
{
<------>unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
<------>u8 buf2[4];
<------>int ret;
<------>int i;
 
<------>if (len < 1 || len > 4)
<------><------>return -EOPNOTSUPP;
 
<------>/* trigger read */
<------>buf2[1] = 0x84 + len - 1;
<------>buf2[0] = addr;
<------>ret = dev->em28xx_write_regs(dev, 0x04, buf2, 2);
<------>if (ret != 2) {
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "failed to trigger read from i2c address 0x%x (error=%i)\n",
<------><------><------> addr, ret);
<------><------>return (ret < 0) ? ret : -EIO;
<------>}
 
<------>/* wait for completion */
<------>while (time_is_after_jiffies(timeout)) {
<------><------>ret = dev->em28xx_read_reg(dev, 0x05);
<------><------>if (ret == 0x84 + len - 1)
<------><------><------>break;
<------><------>if (ret == 0x94 + len - 1) {
<------><------><------>dprintk(1, "R05 returned 0x%02x: I2C ACK error\n",
<------><------><------><------>ret);
<------><------><------>return -ENXIO;
<------><------>}
<------><------>if (ret < 0) {
<------><------><------>dev_warn(&dev->intf->dev,
<------><------><------><------> "failed to get i2c transfer status from bridge register (error=%i)\n",
<------><------><------><------> ret);
<------><------><------>return ret;
<------><------>}
<------><------>usleep_range(5000, 6000);
<------>}
<------>if (ret != 0x84 + len - 1)
<------><------>dprintk(0, "read from i2c device at 0x%x timed out\n", addr);
 
<------>/* get the received message */
<------>ret = dev->em28xx_read_reg_req_len(dev, 0x00, 4 - len, buf2, len);
<------>if (ret != len) {
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "reading from i2c device at 0x%x failed: couldn't get the received message from the bridge (error=%i)\n",
<------><------><------> addr, ret);
<------><------>return (ret < 0) ? ret : -EIO;
<------>}
<------>for (i = 0; i < len; i++)
<------><------>buf[i] = buf2[len - 1 - i];
 
<------>return ret;
}
 
/*
 * em2800_i2c_check_for_device()
 * check if there is an i2c device at the supplied address
 */
static int em2800_i2c_check_for_device(struct em28xx *dev, u8 addr)
{
<------>u8 buf;
<------>int ret;
 
<------>ret = em2800_i2c_recv_bytes(dev, addr, &buf, 1);
<------>if (ret == 1)
<------><------>return 0;
<------>return (ret < 0) ? ret : -EIO;
}
 
/*
 * em28xx_i2c_send_bytes()
 */
static int em28xx_i2c_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
<------><------><------><------> u16 len, int stop)
{
<------>unsigned long timeout = jiffies + em28xx_i2c_timeout(dev);
<------>int ret;
 
<------>if (len < 1 || len > 64)
<------><------>return -EOPNOTSUPP;
<------>/*
<------> * NOTE: limited by the USB ctrl message constraints
<------> * Zero length reads always succeed, even if no device is connected
<------> */
 
<------>/* Write to i2c device */
<------>ret = dev->em28xx_write_regs_req(dev, stop ? 2 : 3, addr, buf, len);
<------>if (ret != len) {
<------><------>if (ret < 0) {
<------><------><------>dev_warn(&dev->intf->dev,
<------><------><------><------> "writing to i2c device at 0x%x failed (error=%i)\n",
<------><------><------><------> addr, ret);
<------><------><------>return ret;
<------><------>}
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
<------><------><------><------>len, addr, ret);
<------><------>return -EIO;
<------>}
 
<------>/* wait for completion */
<------>while (time_is_after_jiffies(timeout)) {
<------><------>ret = dev->em28xx_read_reg(dev, 0x05);
<------><------>if (ret == 0) /* success */
<------><------><------>return len;
<------><------>if (ret == 0x10) {
<------><------><------>dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
<------><------><------><------>addr);
<------><------><------>return -ENXIO;
<------><------>}
<------><------>if (ret < 0) {
<------><------><------>dev_warn(&dev->intf->dev,
<------><------><------><------> "failed to get i2c transfer status from bridge register (error=%i)\n",
<------><------><------><------> ret);
<------><------><------>return ret;
<------><------>}
<------><------>usleep_range(5000, 6000);
<------><------>/*
<------><------> * NOTE: do we really have to wait for success ?
<------><------> * Never seen anything else than 0x00 or 0x10
<------><------> * (even with high payload) ...
<------><------> */
<------>}
 
<------>if (ret == 0x02 || ret == 0x04) {
<------><------>/* NOTE: these errors seem to be related to clock stretching */
<------><------>dprintk(0,
<------><------><------>"write to i2c device at 0x%x timed out (status=%i)\n",
<------><------><------>addr, ret);
<------><------>return -ETIMEDOUT;
<------>}
 
<------>dev_warn(&dev->intf->dev,
<------><------> "write to i2c device at 0x%x failed with unknown error (status=%i)\n",
<------><------> addr, ret);
<------>return -EIO;
}
 
/*
 * em28xx_i2c_recv_bytes()
 * read a byte from the i2c device
 */
static int em28xx_i2c_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf, u16 len)
{
<------>int ret;
 
<------>if (len < 1 || len > 64)
<------><------>return -EOPNOTSUPP;
<------>/*
<------> * NOTE: limited by the USB ctrl message constraints
<------> * Zero length reads always succeed, even if no device is connected
<------> */
 
<------>/* Read data from i2c device */
<------>ret = dev->em28xx_read_reg_req_len(dev, 2, addr, buf, len);
<------>if (ret < 0) {
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "reading from i2c device at 0x%x failed (error=%i)\n",
<------><------><------> addr, ret);
<------><------>return ret;
<------>}
<------>/*
<------> * NOTE: some devices with two i2c buses have the bad habit to return 0
<------> * bytes if we are on bus B AND there was no write attempt to the
<------> * specified slave address before AND no device is present at the
<------> * requested slave address.
<------> * Anyway, the next check will fail with -ENXIO in this case, so avoid
<------> * spamming the system log on device probing and do nothing here.
<------> */
 
<------>/* Check success of the i2c operation */
<------>ret = dev->em28xx_read_reg(dev, 0x05);
<------>if (ret == 0) /* success */
<------><------>return len;
<------>if (ret < 0) {
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "failed to get i2c transfer status from bridge register (error=%i)\n",
<------><------><------> ret);
<------><------>return ret;
<------>}
<------>if (ret == 0x10) {
<------><------>dprintk(1, "I2C ACK error on writing to addr 0x%02x\n",
<------><------><------>addr);
<------><------>return -ENXIO;
<------>}
 
<------>if (ret == 0x02 || ret == 0x04) {
<------><------>/* NOTE: these errors seem to be related to clock stretching */
<------><------>dprintk(0,
<------><------><------>"write to i2c device at 0x%x timed out (status=%i)\n",
<------><------><------>addr, ret);
<------><------>return -ETIMEDOUT;
<------>}
 
<------>dev_warn(&dev->intf->dev,
<------><------> "write to i2c device at 0x%x failed with unknown error (status=%i)\n",
<------><------> addr, ret);
<------>return -EIO;
}
 
/*
 * em28xx_i2c_check_for_device()
 * check if there is a i2c_device at the supplied address
 */
static int em28xx_i2c_check_for_device(struct em28xx *dev, u16 addr)
{
<------>int ret;
<------>u8 buf;
 
<------>ret = em28xx_i2c_recv_bytes(dev, addr, &buf, 1);
<------>if (ret == 1)
<------><------>return 0;
<------>return (ret < 0) ? ret : -EIO;
}
 
/*
 * em25xx_bus_B_send_bytes
 * write bytes to the i2c device
 */
static int em25xx_bus_B_send_bytes(struct em28xx *dev, u16 addr, u8 *buf,
<------><------><------><------>   u16 len)
{
<------>int ret;
 
<------>if (len < 1 || len > 64)
<------><------>return -EOPNOTSUPP;
<------>/*
<------> * NOTE: limited by the USB ctrl message constraints
<------> * Zero length reads always succeed, even if no device is connected
<------> */
 
<------>/* Set register and write value */
<------>ret = dev->em28xx_write_regs_req(dev, 0x06, addr, buf, len);
<------>if (ret != len) {
<------><------>if (ret < 0) {
<------><------><------>dev_warn(&dev->intf->dev,
<------><------><------><------> "writing to i2c device at 0x%x failed (error=%i)\n",
<------><------><------><------> addr, ret);
<------><------><------>return ret;
<------><------>}
 
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "%i bytes write to i2c device at 0x%x requested, but %i bytes written\n",
<------><------><------> len, addr, ret);
<------><------>return -EIO;
<------>}
<------>/* Check success */
<------>ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
<------>/*
<------> * NOTE: the only error we've seen so far is
<------> * 0x01 when the slave device is not present
<------> */
<------>if (!ret)
<------><------>return len;
 
<------>if (ret > 0) {
<------><------>dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
<------><------>return -ENXIO;
<------>}
 
<------>return ret;
<------>/*
<------> * NOTE: With chip types (other chip IDs) which actually don't support
<------> * this operation, it seems to succeed ALWAYS ! (even if there is no
<------> * slave device or even no second i2c bus provided)
<------> */
}
 
/*
 * em25xx_bus_B_recv_bytes
 * read bytes from the i2c device
 */
static int em25xx_bus_B_recv_bytes(struct em28xx *dev, u16 addr, u8 *buf,
<------><------><------><------>   u16 len)
{
<------>int ret;
 
<------>if (len < 1 || len > 64)
<------><------>return -EOPNOTSUPP;
<------>/*
<------> * NOTE: limited by the USB ctrl message constraints
<------> * Zero length reads always succeed, even if no device is connected
<------> */
 
<------>/* Read value */
<------>ret = dev->em28xx_read_reg_req_len(dev, 0x06, addr, buf, len);
<------>if (ret < 0) {
<------><------>dev_warn(&dev->intf->dev,
<------><------><------> "reading from i2c device at 0x%x failed (error=%i)\n",
<------><------><------> addr, ret);
<------><------>return ret;
<------>}
<------>/*
<------> * NOTE: some devices with two i2c buses have the bad habit to return 0
<------> * bytes if we are on bus B AND there was no write attempt to the
<------> * specified slave address before AND no device is present at the
<------> * requested slave address.
<------> * Anyway, the next check will fail with -ENXIO in this case, so avoid
<------> * spamming the system log on device probing and do nothing here.
<------> */
 
<------>/* Check success */
<------>ret = dev->em28xx_read_reg_req(dev, 0x08, 0x0000);
<------>/*
<------> * NOTE: the only error we've seen so far is
<------> * 0x01 when the slave device is not present
<------> */
<------>if (!ret)
<------><------>return len;
 
<------>if (ret > 0) {
<------><------>dprintk(1, "Bus B R08 returned 0x%02x: I2C ACK error\n", ret);
<------><------>return -ENXIO;
<------>}
 
<------>return ret;
<------>/*
<------> * NOTE: With chip types (other chip IDs) which actually don't support
<------> * this operation, it seems to succeed ALWAYS ! (even if there is no
<------> * slave device or even no second i2c bus provided)
<------> */
}
 
/*
 * em25xx_bus_B_check_for_device()
 * check if there is a i2c device at the supplied address
 */
static int em25xx_bus_B_check_for_device(struct em28xx *dev, u16 addr)
{
<------>u8 buf;
<------>int ret;
 
<------>ret = em25xx_bus_B_recv_bytes(dev, addr, &buf, 1);
<------>if (ret < 0)
<------><------>return ret;
 
<------>return 0;
<------>/*
<------> * NOTE: With chips which do not support this operation,
<------> * it seems to succeed ALWAYS ! (even if no device connected)
<------> */
}
 
static inline int i2c_check_for_device(struct em28xx_i2c_bus *i2c_bus, u16 addr)
{
<------>struct em28xx *dev = i2c_bus->dev;
<------>int rc = -EOPNOTSUPP;
 
<------>if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
<------><------>rc = em28xx_i2c_check_for_device(dev, addr);
<------>else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
<------><------>rc = em2800_i2c_check_for_device(dev, addr);
<------>else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
<------><------>rc = em25xx_bus_B_check_for_device(dev, addr);
<------>return rc;
}
 
static inline int i2c_recv_bytes(struct em28xx_i2c_bus *i2c_bus,
<------><------><------><------> struct i2c_msg msg)
{
<------>struct em28xx *dev = i2c_bus->dev;
<------>u16 addr = msg.addr << 1;
<------>int rc = -EOPNOTSUPP;
 
<------>if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
<------><------>rc = em28xx_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
<------>else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
<------><------>rc = em2800_i2c_recv_bytes(dev, addr, msg.buf, msg.len);
<------>else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
<------><------>rc = em25xx_bus_B_recv_bytes(dev, addr, msg.buf, msg.len);
<------>return rc;
}
 
static inline int i2c_send_bytes(struct em28xx_i2c_bus *i2c_bus,
<------><------><------><------> struct i2c_msg msg, int stop)
{
<------>struct em28xx *dev = i2c_bus->dev;
<------>u16 addr = msg.addr << 1;
<------>int rc = -EOPNOTSUPP;
 
<------>if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX)
<------><------>rc = em28xx_i2c_send_bytes(dev, addr, msg.buf, msg.len, stop);
<------>else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)
<------><------>rc = em2800_i2c_send_bytes(dev, addr, msg.buf, msg.len);
<------>else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B)
<------><------>rc = em25xx_bus_B_send_bytes(dev, addr, msg.buf, msg.len);
<------>return rc;
}
 
/*
 * em28xx_i2c_xfer()
 * the main i2c transfer function
 */
static int em28xx_i2c_xfer(struct i2c_adapter *i2c_adap,
<------><------><------>   struct i2c_msg msgs[], int num)
{
<------>struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
<------>struct em28xx *dev = i2c_bus->dev;
<------>unsigned int bus = i2c_bus->bus;
<------>int addr, rc, i;
<------>u8 reg;
 
<------>/*
<------> * prevent i2c xfer attempts after device is disconnected
<------> * some fe's try to do i2c writes/reads from their release
<------> * interfaces when called in disconnect path
<------> */
<------>if (dev->disconnected)
<------><------>return -ENODEV;
 
<------>if (!rt_mutex_trylock(&dev->i2c_bus_lock))
<------><------>return -EAGAIN;
 
<------>/* Switch I2C bus if needed */
<------>if (bus != dev->cur_i2c_bus &&
<------>    i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX) {
<------><------>if (bus == 1)
<------><------><------>reg = EM2874_I2C_SECONDARY_BUS_SELECT;
<------><------>else
<------><------><------>reg = 0;
<------><------>em28xx_write_reg_bits(dev, EM28XX_R06_I2C_CLK, reg,
<------><------><------><------>      EM2874_I2C_SECONDARY_BUS_SELECT);
<------><------>dev->cur_i2c_bus = bus;
<------>}
 
<------>for (i = 0; i < num; i++) {
<------><------>addr = msgs[i].addr << 1;
<------><------>if (!msgs[i].len) {
<------><------><------>/*
<------><------><------> * no len: check only for device presence
<------><------><------> * This code is only called during device probe.
<------><------><------> */
<------><------><------>rc = i2c_check_for_device(i2c_bus, addr);
 
<------><------><------>if (rc == -ENXIO)
<------><------><------><------>rc = -ENODEV;
<------><------>} else if (msgs[i].flags & I2C_M_RD) {
<------><------><------>/* read bytes */
<------><------><------>rc = i2c_recv_bytes(i2c_bus, msgs[i]);
<------><------>} else {
<------><------><------>/* write bytes */
<------><------><------>rc = i2c_send_bytes(i2c_bus, msgs[i], i == num - 1);
<------><------>}
 
<------><------>if (rc < 0)
<------><------><------>goto error;
 
<------><------>dprintk(2, "%s %s addr=%02x len=%d: %*ph\n",
<------><------><------>(msgs[i].flags & I2C_M_RD) ? "read" : "write",
<------><------><------>i == num - 1 ? "stop" : "nonstop",
<------><------><------>addr, msgs[i].len,
<------><------><------>msgs[i].len, msgs[i].buf);
<------>}
 
<------>rt_mutex_unlock(&dev->i2c_bus_lock);
<------>return num;
 
error:
<------>dprintk(2, "%s %s addr=%02x len=%d: %sERROR: %i\n",
<------><------>(msgs[i].flags & I2C_M_RD) ? "read" : "write",
<------><------>i == num - 1 ? "stop" : "nonstop",
<------><------>addr, msgs[i].len,
<------><------>(rc == -ENODEV) ? "no device " : "",
<------><------>rc);
 
<------>rt_mutex_unlock(&dev->i2c_bus_lock);
<------>return rc;
}
 
/*
 * based on linux/sunrpc/svcauth.h and linux/hash.h
 * The original hash function returns a different value, if arch is x86_64
 * or i386.
 */
static inline unsigned long em28xx_hash_mem(char *buf, int length, int bits)
{
<------>unsigned long hash = 0;
<------>unsigned long l = 0;
<------>int len = 0;
<------>unsigned char c;
 
<------>do {
<------><------>if (len == length) {
<------><------><------>c = (char)len;
<------><------><------>len = -1;
<------><------>} else {
<------><------><------>c = *buf++;
<------><------>}
<------><------>l = (l << 8) | c;
<------><------>len++;
<------><------>if ((len & (32 / 8 - 1)) == 0)
<------><------><------>hash = ((hash ^ l) * 0x9e370001UL);
<------>} while (len);
 
<------>return (hash >> (32 - bits)) & 0xffffffffUL;
}
 
/*
 * Helper function to read data blocks from i2c clients with 8 or 16 bit
 * address width, 8 bit register width and auto incrementation been activated
 */
static int em28xx_i2c_read_block(struct em28xx *dev, unsigned int bus, u16 addr,
<------><------><------><------> bool addr_w16, u16 len, u8 *data)
{
<------>int remain = len, rsize, rsize_max, ret;
<------>u8 buf[2];
 
<------>/* Sanity check */
<------>if (addr + remain > (addr_w16 * 0xff00 + 0xff + 1))
<------><------>return -EINVAL;
<------>/* Select address */
<------>buf[0] = addr >> 8;
<------>buf[1] = addr & 0xff;
<------>ret = i2c_master_send(&dev->i2c_client[bus],
<------><------><------>      buf + !addr_w16, 1 + addr_w16);
<------>if (ret < 0)
<------><------>return ret;
<------>/* Read data */
<------>if (dev->board.is_em2800)
<------><------>rsize_max = 4;
<------>else
<------><------>rsize_max = 64;
<------>while (remain > 0) {
<------><------>if (remain > rsize_max)
<------><------><------>rsize = rsize_max;
<------><------>else
<------><------><------>rsize = remain;
 
<------><------>ret = i2c_master_recv(&dev->i2c_client[bus], data, rsize);
<------><------>if (ret < 0)
<------><------><------>return ret;
 
<------><------>remain -= rsize;
<------><------>data += rsize;
<------>}
 
<------>return len;
}
 
static int em28xx_i2c_eeprom(struct em28xx *dev, unsigned int bus,
<------><------><------>     u8 **eedata, u16 *eedata_len)
{
<------>const u16 len = 256;
<------>/*
<------> * FIXME common length/size for bytes to read, to display, hash
<------> * calculation and returned device dataset. Simplifies the code a lot,
<------> * but we might have to deal with multiple sizes in the future !
<------> */
<------>int err;
<------>struct em28xx_eeprom *dev_config;
<------>u8 buf, *data;
 
<------>*eedata = NULL;
<------>*eedata_len = 0;
 
<------>/* EEPROM is always on i2c bus 0 on all known devices. */
 
<------>dev->i2c_client[bus].addr = 0xa0 >> 1;
 
<------>/* Check if board has eeprom */
<------>err = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
<------>if (err < 0) {
<------><------>dev_info(&dev->intf->dev, "board has no eeprom\n");
<------><------>return -ENODEV;
<------>}
 
<------>data = kzalloc(len, GFP_KERNEL);
<------>if (!data)
<------><------>return -ENOMEM;
 
<------>/* Read EEPROM content */
<------>err = em28xx_i2c_read_block(dev, bus, 0x0000,
<------><------><------><------>    dev->eeprom_addrwidth_16bit,
<------><------><------><------>    len, data);
<------>if (err != len) {
<------><------>dev_err(&dev->intf->dev,
<------><------><------>"failed to read eeprom (err=%d)\n", err);
<------><------>goto error;
<------>}
 
<------>if (i2c_debug) {
<------><------>/* Display eeprom content */
<------><------>print_hex_dump(KERN_DEBUG, "em28xx eeprom ", DUMP_PREFIX_OFFSET,
<------><------><------>       16, 1, data, len, true);
 
<------><------>if (dev->eeprom_addrwidth_16bit)
<------><------><------>dev_info(&dev->intf->dev,
<------><------><------><------> "eeprom %06x: ... (skipped)\n", 256);
<------>}
 
<------>if (dev->eeprom_addrwidth_16bit &&
<------>    data[0] == 0x26 && data[3] == 0x00) {
<------><------>/* new eeprom format; size 4-64kb */
<------><------>u16 mc_start;
<------><------>u16 hwconf_offset;
 
<------><------>dev->hash = em28xx_hash_mem(data, len, 32);
<------><------>mc_start = (data[1] << 8) + 4;	/* usually 0x0004 */
 
<------><------>dev_info(&dev->intf->dev,
<------><------><------> "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
<------><------><------> data, dev->hash);
<------><------>dev_info(&dev->intf->dev,
<------><------><------> "EEPROM info:\n");
<------><------>dev_info(&dev->intf->dev,
<------><------><------> "\tmicrocode start address = 0x%04x, boot configuration = 0x%02x\n",
<------><------><------> mc_start, data[2]);
<------><------>/*
<------><------> * boot configuration (address 0x0002):
<------><------> * [0]   microcode download speed: 1 = 400 kHz; 0 = 100 kHz
<------><------> * [1]   always selects 12 kb RAM
<------><------> * [2]   USB device speed: 1 = force Full Speed; 0 = auto detect
<------><------> * [4]   1 = force fast mode and no suspend for device testing
<------><------> * [5:7] USB PHY tuning registers; determined by device
<------><------> *       characterization
<------><------> */
 
<------><------>/*
<------><------> * Read hardware config dataset offset from address
<------><------> * (microcode start + 46)
<------><------> */
<------><------>err = em28xx_i2c_read_block(dev, bus, mc_start + 46, 1, 2,
<------><------><------><------><------>    data);
<------><------>if (err != 2) {
<------><------><------>dev_err(&dev->intf->dev,
<------><------><------><------>"failed to read hardware configuration data from eeprom (err=%d)\n",
<------><------><------><------>err);
<------><------><------>goto error;
<------><------>}
 
<------><------>/* Calculate hardware config dataset start address */
<------><------>hwconf_offset = mc_start + data[0] + (data[1] << 8);
 
<------><------>/* Read hardware config dataset */
<------><------>/*
<------><------> * NOTE: the microcode copy can be multiple pages long, but
<------><------> * we assume the hardware config dataset is the same as in
<------><------> * the old eeprom and not longer than 256 bytes.
<------><------> * tveeprom is currently also limited to 256 bytes.
<------><------> */
<------><------>err = em28xx_i2c_read_block(dev, bus, hwconf_offset, 1, len,
<------><------><------><------><------>    data);
<------><------>if (err != len) {
<------><------><------>dev_err(&dev->intf->dev,
<------><------><------><------>"failed to read hardware configuration data from eeprom (err=%d)\n",
<------><------><------><------>err);
<------><------><------>goto error;
<------><------>}
 
<------><------>/* Verify hardware config dataset */
<------><------>/* NOTE: not all devices provide this type of dataset */
<------><------>if (data[0] != 0x1a || data[1] != 0xeb ||
<------><------>    data[2] != 0x67 || data[3] != 0x95) {
<------><------><------>dev_info(&dev->intf->dev,
<------><------><------><------> "\tno hardware configuration dataset found in eeprom\n");
<------><------><------>kfree(data);
<------><------><------>return 0;
<------><------>}
 
<------><------>/*
<------><------> * TODO: decrypt eeprom data for camera bridges
<------><------> * (em25xx, em276x+)
<------><------> */
 
<------>} else if (!dev->eeprom_addrwidth_16bit &&
<------><------>   data[0] == 0x1a && data[1] == 0xeb &&
<------><------>   data[2] == 0x67 && data[3] == 0x95) {
<------><------>dev->hash = em28xx_hash_mem(data, len, 32);
<------><------>dev_info(&dev->intf->dev,
<------><------><------> "EEPROM ID = %4ph, EEPROM hash = 0x%08lx\n",
<------><------><------> data, dev->hash);
<------><------>dev_info(&dev->intf->dev,
<------><------><------> "EEPROM info:\n");
<------>} else {
<------><------>dev_info(&dev->intf->dev,
<------><------><------> "unknown eeprom format or eeprom corrupted !\n");
<------><------>err = -ENODEV;
<------><------>goto error;
<------>}
 
<------>*eedata = data;
<------>*eedata_len = len;
<------>dev_config = (void *)*eedata;
 
<------>switch (le16_to_cpu(dev_config->chip_conf) >> 4 & 0x3) {
<------>case 0:
<------><------>dev_info(&dev->intf->dev, "\tNo audio on board.\n");
<------><------>break;
<------>case 1:
<------><------>dev_info(&dev->intf->dev, "\tAC97 audio (5 sample rates)\n");
<------><------>break;
<------>case 2:
<------><------>if (dev->chip_id < CHIP_ID_EM2860)
<------><------><------>dev_info(&dev->intf->dev,
<------><------><------><------> "\tI2S audio, sample rate=32k\n");
<------><------>else
<------><------><------>dev_info(&dev->intf->dev,
<------><------><------><------> "\tI2S audio, 3 sample rates\n");
<------><------>break;
<------>case 3:
<------><------>if (dev->chip_id < CHIP_ID_EM2860)
<------><------><------>dev_info(&dev->intf->dev,
<------><------><------><------> "\tI2S audio, 3 sample rates\n");
<------><------>else
<------><------><------>dev_info(&dev->intf->dev,
<------><------><------><------> "\tI2S audio, 5 sample rates\n");
<------><------>break;
<------>}
 
<------>if (le16_to_cpu(dev_config->chip_conf) & 1 << 3)
<------><------>dev_info(&dev->intf->dev, "\tUSB Remote wakeup capable\n");
 
<------>if (le16_to_cpu(dev_config->chip_conf) & 1 << 2)
<------><------>dev_info(&dev->intf->dev, "\tUSB Self power capable\n");
 
<------>switch (le16_to_cpu(dev_config->chip_conf) & 0x3) {
<------>case 0:
<------><------>dev_info(&dev->intf->dev, "\t500mA max power\n");
<------><------>break;
<------>case 1:
<------><------>dev_info(&dev->intf->dev, "\t400mA max power\n");
<------><------>break;
<------>case 2:
<------><------>dev_info(&dev->intf->dev, "\t300mA max power\n");
<------><------>break;
<------>case 3:
<------><------>dev_info(&dev->intf->dev, "\t200mA max power\n");
<------><------>break;
<------>}
<------>dev_info(&dev->intf->dev,
<------><------> "\tTable at offset 0x%02x, strings=0x%04x, 0x%04x, 0x%04x\n",
<------><------> dev_config->string_idx_table,
<------><------> le16_to_cpu(dev_config->string1),
<------><------> le16_to_cpu(dev_config->string2),
<------><------> le16_to_cpu(dev_config->string3));
 
<------>return 0;
 
error:
<------>kfree(data);
<------>return err;
}
 
/* ----------------------------------------------------------- */
 
/*
 * functionality()
 */
static u32 functionality(struct i2c_adapter *i2c_adap)
{
<------>struct em28xx_i2c_bus *i2c_bus = i2c_adap->algo_data;
 
<------>if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM28XX ||
<------>    i2c_bus->algo_type == EM28XX_I2C_ALGO_EM25XX_BUS_B) {
<------><------>return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
<------>} else if (i2c_bus->algo_type == EM28XX_I2C_ALGO_EM2800)  {
<------><------>return (I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL) &
<------><------><------>~I2C_FUNC_SMBUS_WRITE_BLOCK_DATA;
<------>}
 
<------>WARN(1, "Unknown i2c bus algorithm.\n");
<------>return 0;
}
 
static const struct i2c_algorithm em28xx_algo = {
<------>.master_xfer   = em28xx_i2c_xfer,
<------>.functionality = functionality,
};
 
static const struct i2c_adapter em28xx_adap_template = {
<------>.owner = THIS_MODULE,
<------>.name = "em28xx",
<------>.algo = &em28xx_algo,
};
 
static const struct i2c_client em28xx_client_template = {
<------>.name = "em28xx internal",
};
 
/* ----------------------------------------------------------- */
 
/*
 * i2c_devs
 * incomplete list of known devices
 */
static char *i2c_devs[128] = {
<------>[0x1c >> 1] = "lgdt330x",
<------>[0x3e >> 1] = "remote IR sensor",
<------>[0x4a >> 1] = "saa7113h",
<------>[0x52 >> 1] = "drxk",
<------>[0x60 >> 1] = "remote IR sensor",
<------>[0x8e >> 1] = "remote IR sensor",
<------>[0x86 >> 1] = "tda9887",
<------>[0x80 >> 1] = "msp34xx",
<------>[0x88 >> 1] = "msp34xx",
<------>[0xa0 >> 1] = "eeprom",
<------>[0xb0 >> 1] = "tda9874",
<------>[0xb8 >> 1] = "tvp5150a",
<------>[0xba >> 1] = "webcam sensor or tvp5150a",
<------>[0xc0 >> 1] = "tuner (analog)",
<------>[0xc2 >> 1] = "tuner (analog)",
<------>[0xc4 >> 1] = "tuner (analog)",
<------>[0xc6 >> 1] = "tuner (analog)",
};
 
/*
 * do_i2c_scan()
 * check i2c address range for devices
 */
void em28xx_do_i2c_scan(struct em28xx *dev, unsigned int bus)
{
<------>u8 i2c_devicelist[128];
<------>unsigned char buf;
<------>int i, rc;
 
<------>memset(i2c_devicelist, 0, sizeof(i2c_devicelist));
 
<------>for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
<------><------>dev->i2c_client[bus].addr = i;
<------><------>rc = i2c_master_recv(&dev->i2c_client[bus], &buf, 0);
<------><------>if (rc < 0)
<------><------><------>continue;
<------><------>i2c_devicelist[i] = i;
<------><------>dev_info(&dev->intf->dev,
<------><------><------> "found i2c device @ 0x%x on bus %d [%s]\n",
<------><------><------> i << 1, bus, i2c_devs[i] ? i2c_devs[i] : "???");
<------>}
 
<------>if (bus == dev->def_i2c_bus)
<------><------>dev->i2c_hash = em28xx_hash_mem(i2c_devicelist,
<------><------><------><------><------><------>sizeof(i2c_devicelist), 32);
}
 
/*
 * em28xx_i2c_register()
 * register i2c bus
 */
int em28xx_i2c_register(struct em28xx *dev, unsigned int bus,
<------><------><------>enum em28xx_i2c_algo_type algo_type)
{
<------>int retval;
 
<------>if (WARN_ON(!dev->em28xx_write_regs || !dev->em28xx_read_reg ||
<------><------>    !dev->em28xx_write_regs_req || !dev->em28xx_read_reg_req))
<------><------>return -ENODEV;
 
<------>if (bus >= NUM_I2C_BUSES)
<------><------>return -ENODEV;
 
<------>dev->i2c_adap[bus] = em28xx_adap_template;
<------>dev->i2c_adap[bus].dev.parent = &dev->intf->dev;
<------>strscpy(dev->i2c_adap[bus].name, dev_name(&dev->intf->dev),
<------><------>sizeof(dev->i2c_adap[bus].name));
 
<------>dev->i2c_bus[bus].bus = bus;
<------>dev->i2c_bus[bus].algo_type = algo_type;
<------>dev->i2c_bus[bus].dev = dev;
<------>dev->i2c_adap[bus].algo_data = &dev->i2c_bus[bus];
 
<------>retval = i2c_add_adapter(&dev->i2c_adap[bus]);
<------>if (retval < 0) {
<------><------>dev_err(&dev->intf->dev,
<------><------><------>"%s: i2c_add_adapter failed! retval [%d]\n",
<------><------><------>__func__, retval);
<------><------>return retval;
<------>}
 
<------>dev->i2c_client[bus] = em28xx_client_template;
<------>dev->i2c_client[bus].adapter = &dev->i2c_adap[bus];
 
<------>/* Up to now, all eeproms are at bus 0 */
<------>if (!bus) {
<------><------>retval = em28xx_i2c_eeprom(dev, bus,
<------><------><------><------><------>   &dev->eedata, &dev->eedata_len);
<------><------>if (retval < 0 && retval != -ENODEV) {
<------><------><------>dev_err(&dev->intf->dev,
<------><------><------><------>"%s: em28xx_i2_eeprom failed! retval [%d]\n",
<------><------><------><------>__func__, retval);
<------><------>}
<------>}
 
<------>if (i2c_scan)
<------><------>em28xx_do_i2c_scan(dev, bus);
 
<------>return 0;
}
 
/*
 * em28xx_i2c_unregister()
 * unregister i2c_bus
 */
int em28xx_i2c_unregister(struct em28xx *dev, unsigned int bus)
{
<------>if (bus >= NUM_I2C_BUSES)
<------><------>return -ENODEV;
 
<------>i2c_del_adapter(&dev->i2c_adap[bus]);
<------>return 0;
}