// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for the Auvitek AU0828 USB bridge
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*
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* Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
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*/
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#include "au0828.h"
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/io.h>
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#include "media/tuner.h"
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#include <media/v4l2-common.h>
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static int i2c_scan;
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module_param(i2c_scan, int, 0444);
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MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
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#define I2C_WAIT_DELAY 25
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#define I2C_WAIT_RETRY 1000
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static inline int i2c_slave_did_write_ack(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, AU0828_I2C_STATUS_201) &
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AU0828_I2C_STATUS_NO_WRITE_ACK ? 0 : 1;
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}
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static inline int i2c_slave_did_read_ack(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, AU0828_I2C_STATUS_201) &
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AU0828_I2C_STATUS_NO_READ_ACK ? 0 : 1;
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}
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static int i2c_wait_read_ack(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (!i2c_slave_did_read_ack(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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static inline int i2c_is_read_busy(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, AU0828_I2C_STATUS_201) &
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AU0828_I2C_STATUS_READ_DONE ? 0 : 1;
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}
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static int i2c_wait_read_done(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (!i2c_is_read_busy(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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static inline int i2c_is_write_done(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, AU0828_I2C_STATUS_201) &
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AU0828_I2C_STATUS_WRITE_DONE ? 1 : 0;
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}
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static int i2c_wait_write_done(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (i2c_is_write_done(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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return au0828_read(dev, AU0828_I2C_STATUS_201) &
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AU0828_I2C_STATUS_BUSY ? 1 : 0;
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}
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static int i2c_wait_done(struct i2c_adapter *i2c_adap)
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{
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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if (!i2c_is_busy(i2c_adap))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return 0;
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return 1;
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}
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/* FIXME: Implement join handling correctly */
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static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg, int joined_rlen)
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{
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int i, strobe = 0;
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struct au0828_dev *dev = i2c_adap->algo_data;
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u8 i2c_speed = dev->board.i2c_clk_divider;
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dprintk(4, "%s()\n", __func__);
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au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
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if (((dev->board.tuner_type == TUNER_XC5000) ||
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(dev->board.tuner_type == TUNER_XC5000C)) &&
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(dev->board.tuner_addr == msg->addr)) {
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/*
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* Due to I2C clock stretch, we need to use a lower speed
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* on xc5000 for commands. However, firmware transfer can
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* speed up to 400 KHz.
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*/
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if (msg->len == 64)
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i2c_speed = AU0828_I2C_CLK_250KHZ;
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else
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i2c_speed = AU0828_I2C_CLK_20KHZ;
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}
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/* Set the I2C clock */
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au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed);
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/* Hardware needs 8 bit addresses */
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au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
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dprintk(4, "SEND: %02x\n", msg->addr);
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/* Deal with i2c_scan */
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if (msg->len == 0) {
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/* The analog tuner detection code makes use of the SMBUS_QUICK
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message (which involves a zero length i2c write). To avoid
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checking the status register when we didn't strobe out any
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actual bytes to the bus, just do a read check. This is
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consistent with how I saw i2c device checking done in the
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USB trace of the Windows driver */
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au0828_write(dev, AU0828_I2C_TRIGGER_200,
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AU0828_I2C_TRIGGER_READ);
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if (!i2c_wait_done(i2c_adap))
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return -EIO;
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if (i2c_wait_read_ack(i2c_adap))
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return -EIO;
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return 0;
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}
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for (i = 0; i < msg->len;) {
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dprintk(4, " %02x\n", msg->buf[i]);
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au0828_write(dev, AU0828_I2C_WRITE_FIFO_205, msg->buf[i]);
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strobe++;
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i++;
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if ((strobe >= 4) || (i >= msg->len)) {
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/* Strobe the byte into the bus */
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if (i < msg->len)
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au0828_write(dev, AU0828_I2C_TRIGGER_200,
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AU0828_I2C_TRIGGER_WRITE |
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AU0828_I2C_TRIGGER_HOLD);
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else
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au0828_write(dev, AU0828_I2C_TRIGGER_200,
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AU0828_I2C_TRIGGER_WRITE);
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/* Reset strobe trigger */
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strobe = 0;
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if (!i2c_wait_write_done(i2c_adap))
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return -EIO;
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}
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}
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if (!i2c_wait_done(i2c_adap))
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return -EIO;
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dprintk(4, "\n");
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return msg->len;
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}
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/* FIXME: Implement join handling correctly */
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static int i2c_readbytes(struct i2c_adapter *i2c_adap,
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const struct i2c_msg *msg, int joined)
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{
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struct au0828_dev *dev = i2c_adap->algo_data;
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u8 i2c_speed = dev->board.i2c_clk_divider;
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int i;
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dprintk(4, "%s()\n", __func__);
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au0828_write(dev, AU0828_I2C_MULTIBYTE_MODE_2FF, 0x01);
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/*
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* Due to xc5000c clock stretch, we cannot use full speed at
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* readings from xc5000, as otherwise they'll fail.
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*/
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if (((dev->board.tuner_type == TUNER_XC5000) ||
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(dev->board.tuner_type == TUNER_XC5000C)) &&
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(dev->board.tuner_addr == msg->addr))
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i2c_speed = AU0828_I2C_CLK_20KHZ;
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/* Set the I2C clock */
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au0828_write(dev, AU0828_I2C_CLK_DIVIDER_202, i2c_speed);
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/* Hardware needs 8 bit addresses */
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au0828_write(dev, AU0828_I2C_DEST_ADDR_203, msg->addr << 1);
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dprintk(4, " RECV:\n");
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/* Deal with i2c_scan */
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if (msg->len == 0) {
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au0828_write(dev, AU0828_I2C_TRIGGER_200,
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AU0828_I2C_TRIGGER_READ);
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if (i2c_wait_read_ack(i2c_adap))
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return -EIO;
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return 0;
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}
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for (i = 0; i < msg->len;) {
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i++;
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if (i < msg->len)
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au0828_write(dev, AU0828_I2C_TRIGGER_200,
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AU0828_I2C_TRIGGER_READ |
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AU0828_I2C_TRIGGER_HOLD);
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else
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au0828_write(dev, AU0828_I2C_TRIGGER_200,
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AU0828_I2C_TRIGGER_READ);
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if (!i2c_wait_read_done(i2c_adap))
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return -EIO;
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msg->buf[i-1] = au0828_read(dev, AU0828_I2C_READ_FIFO_209) &
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0xff;
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dprintk(4, " %02x\n", msg->buf[i-1]);
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}
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if (!i2c_wait_done(i2c_adap))
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return -EIO;
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dprintk(4, "\n");
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return msg->len;
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}
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static int i2c_xfer(struct i2c_adapter *i2c_adap,
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struct i2c_msg *msgs, int num)
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{
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int i, retval = 0;
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dprintk(4, "%s(num = %d)\n", __func__, num);
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for (i = 0; i < num; i++) {
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dprintk(4, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
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__func__, num, msgs[i].addr, msgs[i].len);
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if (msgs[i].flags & I2C_M_RD) {
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/* read */
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retval = i2c_readbytes(i2c_adap, &msgs[i], 0);
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} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
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msgs[i].addr == msgs[i + 1].addr) {
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/* write then read from same address */
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retval = i2c_sendbytes(i2c_adap, &msgs[i],
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msgs[i + 1].len);
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if (retval < 0)
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goto err;
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i++;
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retval = i2c_readbytes(i2c_adap, &msgs[i], 1);
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} else {
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/* write */
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retval = i2c_sendbytes(i2c_adap, &msgs[i], 0);
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}
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if (retval < 0)
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goto err;
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}
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return num;
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err:
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return retval;
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}
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static u32 au0828_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
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}
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static const struct i2c_algorithm au0828_i2c_algo_template = {
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.master_xfer = i2c_xfer,
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.functionality = au0828_functionality,
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};
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/* ----------------------------------------------------------------------- */
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static const struct i2c_adapter au0828_i2c_adap_template = {
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.name = KBUILD_MODNAME,
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.owner = THIS_MODULE,
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.algo = &au0828_i2c_algo_template,
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};
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static const struct i2c_client au0828_i2c_client_template = {
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.name = "au0828 internal",
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};
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static char *i2c_devs[128] = {
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[0x8e >> 1] = "au8522",
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[0xa0 >> 1] = "eeprom",
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[0xc2 >> 1] = "tuner/xc5000",
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};
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static void do_i2c_scan(char *name, struct i2c_client *c)
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{
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unsigned char buf;
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int i, rc;
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for (i = 0; i < 128; i++) {
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c->addr = i;
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rc = i2c_master_recv(c, &buf, 0);
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if (rc < 0)
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continue;
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pr_info("%s: i2c scan: found device @ 0x%x [%s]\n",
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name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
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}
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}
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/* init + register i2c adapter */
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int au0828_i2c_register(struct au0828_dev *dev)
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{
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dprintk(1, "%s()\n", __func__);
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dev->i2c_adap = au0828_i2c_adap_template;
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dev->i2c_algo = au0828_i2c_algo_template;
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dev->i2c_client = au0828_i2c_client_template;
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dev->i2c_adap.dev.parent = &dev->usbdev->dev;
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strscpy(dev->i2c_adap.name, KBUILD_MODNAME,
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sizeof(dev->i2c_adap.name));
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dev->i2c_adap.algo = &dev->i2c_algo;
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dev->i2c_adap.algo_data = dev;
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#ifdef CONFIG_VIDEO_AU0828_V4L2
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i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
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#else
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i2c_set_adapdata(&dev->i2c_adap, dev);
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#endif
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i2c_add_adapter(&dev->i2c_adap);
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dev->i2c_client.adapter = &dev->i2c_adap;
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if (0 == dev->i2c_rc) {
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pr_info("i2c bus registered\n");
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if (i2c_scan)
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do_i2c_scan(KBUILD_MODNAME, &dev->i2c_client);
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} else
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pr_info("i2c bus register FAILED\n");
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return dev->i2c_rc;
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}
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int au0828_i2c_unregister(struct au0828_dev *dev)
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{
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i2c_del_adapter(&dev->i2c_adap);
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return 0;
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}
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