375 lines
8.6 KiB
C
375 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for the Conexant CX23885 PCIe bridge
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*
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* Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
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*/
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#include "cx23885.h"
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <media/v4l2-common.h>
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static unsigned int i2c_debug;
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module_param(i2c_debug, int, 0644);
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MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
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static unsigned 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 dprintk(level, fmt, arg...)\
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do { if (i2c_debug >= level)\
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printk(KERN_DEBUG pr_fmt("%s: i2c:" fmt), \
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__func__, ##arg); \
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} while (0)
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#define I2C_WAIT_DELAY 32
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#define I2C_WAIT_RETRY 64
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#define I2C_EXTEND (1 << 3)
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#define I2C_NOSTOP (1 << 4)
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static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
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{
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struct cx23885_i2c *bus = i2c_adap->algo_data;
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struct cx23885_dev *dev = bus->dev;
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return cx_read(bus->reg_stat) & 0x01;
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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 cx23885_i2c *bus = i2c_adap->algo_data;
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struct cx23885_dev *dev = bus->dev;
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return cx_read(bus->reg_stat) & 0x02 ? 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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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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struct cx23885_i2c *bus = i2c_adap->algo_data;
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struct cx23885_dev *dev = bus->dev;
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u32 wdata, addr, ctrl;
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int retval, cnt;
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if (joined_rlen)
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dprintk(1, "%s(msg->wlen=%d, nextmsg->rlen=%d)\n", __func__,
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msg->len, joined_rlen);
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else
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dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
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/* Deal with i2c probe functions with zero payload */
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if (msg->len == 0) {
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cx_write(bus->reg_addr, msg->addr << 25);
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cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
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if (!i2c_wait_done(i2c_adap))
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return -EIO;
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if (!i2c_slave_did_ack(i2c_adap))
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return -ENXIO;
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dprintk(1, "%s() returns 0\n", __func__);
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return 0;
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}
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/* dev, reg + first byte */
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addr = (msg->addr << 25) | msg->buf[0];
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wdata = msg->buf[0];
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ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
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if (msg->len > 1)
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ctrl |= I2C_NOSTOP | I2C_EXTEND;
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else if (joined_rlen)
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ctrl |= I2C_NOSTOP;
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cx_write(bus->reg_addr, addr);
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cx_write(bus->reg_wdata, wdata);
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cx_write(bus->reg_ctrl, ctrl);
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if (!i2c_wait_done(i2c_adap))
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goto eio;
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if (i2c_debug) {
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printk(KERN_DEBUG " <W %02x %02x", msg->addr << 1, msg->buf[0]);
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if (!(ctrl & I2C_NOSTOP))
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pr_cont(" >\n");
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}
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for (cnt = 1; cnt < msg->len; cnt++) {
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/* following bytes */
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wdata = msg->buf[cnt];
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ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
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if (cnt < msg->len - 1)
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ctrl |= I2C_NOSTOP | I2C_EXTEND;
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else if (joined_rlen)
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ctrl |= I2C_NOSTOP;
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cx_write(bus->reg_addr, addr);
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cx_write(bus->reg_wdata, wdata);
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cx_write(bus->reg_ctrl, ctrl);
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if (!i2c_wait_done(i2c_adap))
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goto eio;
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if (i2c_debug) {
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pr_cont(" %02x", msg->buf[cnt]);
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if (!(ctrl & I2C_NOSTOP))
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pr_cont(" >\n");
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}
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}
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return msg->len;
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eio:
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retval = -EIO;
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if (i2c_debug)
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pr_err(" ERR: %d\n", retval);
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return retval;
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}
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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 cx23885_i2c *bus = i2c_adap->algo_data;
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struct cx23885_dev *dev = bus->dev;
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u32 ctrl, cnt;
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int retval;
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if (i2c_debug && !joined)
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dprintk(1, "%s(msg->len=%d)\n", __func__, msg->len);
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/* Deal with i2c probe functions with zero payload */
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if (msg->len == 0) {
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cx_write(bus->reg_addr, msg->addr << 25);
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cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
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if (!i2c_wait_done(i2c_adap))
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return -EIO;
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if (!i2c_slave_did_ack(i2c_adap))
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return -ENXIO;
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dprintk(1, "%s() returns 0\n", __func__);
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return 0;
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}
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if (i2c_debug) {
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if (joined)
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dprintk(1, " R");
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else
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dprintk(1, " <R %02x", (msg->addr << 1) + 1);
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}
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for (cnt = 0; cnt < msg->len; cnt++) {
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ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
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if (cnt < msg->len - 1)
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ctrl |= I2C_NOSTOP | I2C_EXTEND;
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cx_write(bus->reg_addr, msg->addr << 25);
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cx_write(bus->reg_ctrl, ctrl);
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if (!i2c_wait_done(i2c_adap))
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goto eio;
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msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
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if (i2c_debug) {
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dprintk(1, " %02x", msg->buf[cnt]);
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if (!(ctrl & I2C_NOSTOP))
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dprintk(1, " >\n");
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}
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}
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return msg->len;
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eio:
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retval = -EIO;
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if (i2c_debug)
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pr_err(" ERR: %d\n", retval);
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return retval;
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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(1, "%s(num = %d)\n", __func__, num);
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for (i = 0 ; i < num; i++) {
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dprintk(1, "%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 cx23885_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 cx23885_i2c_algo_template = {
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.master_xfer = i2c_xfer,
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.functionality = cx23885_functionality,
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};
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/* ----------------------------------------------------------------------- */
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static const struct i2c_adapter cx23885_i2c_adap_template = {
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.name = "cx23885",
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.owner = THIS_MODULE,
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.algo = &cx23885_i2c_algo_template,
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};
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static const struct i2c_client cx23885_i2c_client_template = {
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.name = "cx23885 internal",
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};
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static char *i2c_devs[128] = {
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[0x10 >> 1] = "tda10048",
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[0x12 >> 1] = "dib7000pc",
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[0x1c >> 1] = "lgdt3303",
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[0x80 >> 1] = "cs3308",
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[0x82 >> 1] = "cs3308",
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[0x86 >> 1] = "tda9887",
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[0x32 >> 1] = "cx24227",
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[0x88 >> 1] = "cx25837",
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[0x84 >> 1] = "tda8295",
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[0x98 >> 1] = "flatiron",
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[0xa0 >> 1] = "eeprom",
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[0xc0 >> 1] = "tuner/mt2131/tda8275",
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[0xc2 >> 1] = "tuner/mt2131/tda8275/xc5000/xc3028",
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[0xc8 >> 1] = "tuner/xc3028L",
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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%04x [%s]\n",
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name, i, 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 cx23885_i2c_register(struct cx23885_i2c *bus)
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{
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struct cx23885_dev *dev = bus->dev;
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dprintk(1, "%s(bus = %d)\n", __func__, bus->nr);
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bus->i2c_adap = cx23885_i2c_adap_template;
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bus->i2c_client = cx23885_i2c_client_template;
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bus->i2c_adap.dev.parent = &dev->pci->dev;
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strscpy(bus->i2c_adap.name, bus->dev->name,
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sizeof(bus->i2c_adap.name));
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bus->i2c_adap.algo_data = bus;
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i2c_set_adapdata(&bus->i2c_adap, &dev->v4l2_dev);
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i2c_add_adapter(&bus->i2c_adap);
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bus->i2c_client.adapter = &bus->i2c_adap;
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if (0 == bus->i2c_rc) {
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dprintk(1, "%s: i2c bus %d registered\n", dev->name, bus->nr);
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if (i2c_scan) {
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pr_info("%s: scan bus %d:\n",
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dev->name, bus->nr);
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do_i2c_scan(dev->name, &bus->i2c_client);
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}
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} else
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pr_warn("%s: i2c bus %d register FAILED\n",
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dev->name, bus->nr);
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/* Instantiate the IR receiver device, if present */
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if (0 == bus->i2c_rc) {
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struct i2c_board_info info;
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static const unsigned short addr_list[] = {
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0x6b, I2C_CLIENT_END
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};
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memset(&info, 0, sizeof(struct i2c_board_info));
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strscpy(info.type, "ir_video", I2C_NAME_SIZE);
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/* Use quick read command for probe, some IR chips don't
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* support writes */
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i2c_new_probed_device(&bus->i2c_adap, &info, addr_list,
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i2c_probe_func_quick_read);
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}
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return bus->i2c_rc;
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}
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int cx23885_i2c_unregister(struct cx23885_i2c *bus)
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{
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i2c_del_adapter(&bus->i2c_adap);
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return 0;
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}
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void cx23885_av_clk(struct cx23885_dev *dev, int enable)
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{
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/* write 0 to bus 2 addr 0x144 via i2x_xfer() */
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char buffer[3];
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struct i2c_msg msg;
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dprintk(1, "%s(enabled = %d)\n", __func__, enable);
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/* Register 0x144 */
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buffer[0] = 0x01;
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buffer[1] = 0x44;
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if (enable == 1)
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buffer[2] = 0x05;
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else
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buffer[2] = 0x00;
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msg.addr = 0x44;
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msg.flags = I2C_M_TEN;
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msg.len = 3;
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msg.buf = buffer;
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i2c_xfer(&dev->i2c_bus[2].i2c_adap, &msg, 1);
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}
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