376 lines
8.8 KiB
C
376 lines
8.8 KiB
C
/*
|
|
* Driver for the Conexant CX23885 PCIe bridge
|
|
*
|
|
* Copyright (c) 2006 Steven Toth <stoth@hauppauge.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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <asm/io.h>
|
|
|
|
#include "cx23885.h"
|
|
|
|
#include <media/v4l2-common.h>
|
|
|
|
static unsigned int i2c_debug = 0;
|
|
module_param(i2c_debug, int, 0644);
|
|
MODULE_PARM_DESC(i2c_debug, "enable debug messages [i2c]");
|
|
|
|
static unsigned int i2c_scan = 0;
|
|
module_param(i2c_scan, int, 0444);
|
|
MODULE_PARM_DESC(i2c_scan, "scan i2c bus at insmod time");
|
|
|
|
#define dprintk(level,fmt, arg...) if (i2c_debug >= level) \
|
|
printk(KERN_DEBUG "%s: " fmt, dev->name , ## arg)
|
|
|
|
#define I2C_WAIT_DELAY 32
|
|
#define I2C_WAIT_RETRY 64
|
|
|
|
#define I2C_EXTEND (1 << 3)
|
|
#define I2C_NOSTOP (1 << 4)
|
|
|
|
static inline int i2c_slave_did_ack(struct i2c_adapter *i2c_adap)
|
|
{
|
|
struct cx23885_i2c *bus = i2c_adap->algo_data;
|
|
struct cx23885_dev *dev = bus->dev;
|
|
return cx_read(bus->reg_stat) & 0x01;
|
|
}
|
|
|
|
static inline int i2c_is_busy(struct i2c_adapter *i2c_adap)
|
|
{
|
|
struct cx23885_i2c *bus = i2c_adap->algo_data;
|
|
struct cx23885_dev *dev = bus->dev;
|
|
return cx_read(bus->reg_stat) & 0x02 ? 1 : 0;
|
|
}
|
|
|
|
static int i2c_wait_done(struct i2c_adapter *i2c_adap)
|
|
{
|
|
int count;
|
|
|
|
for (count = 0; count < I2C_WAIT_RETRY; count++) {
|
|
if (!i2c_is_busy(i2c_adap))
|
|
break;
|
|
udelay(I2C_WAIT_DELAY);
|
|
}
|
|
|
|
if (I2C_WAIT_RETRY == count)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
|
|
const struct i2c_msg *msg, int last)
|
|
{
|
|
struct cx23885_i2c *bus = i2c_adap->algo_data;
|
|
struct cx23885_dev *dev = bus->dev;
|
|
u32 wdata, addr, ctrl;
|
|
int retval, cnt;
|
|
|
|
dprintk(1, "%s()\n", __FUNCTION__);
|
|
/* Deal with i2c probe functions with zero payload */
|
|
if (msg->len == 0) {
|
|
cx_write(bus->reg_addr, msg->addr << 25);
|
|
cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2));
|
|
if (!i2c_wait_done(i2c_adap))
|
|
return -EIO;
|
|
if (!i2c_slave_did_ack(i2c_adap))
|
|
return -EIO;
|
|
|
|
dprintk(1, "%s() returns 0\n", __FUNCTION__);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* dev, reg + first byte */
|
|
addr = (msg->addr << 25) | msg->buf[0];
|
|
wdata = msg->buf[0];
|
|
ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
|
|
|
|
if (msg->len > 1)
|
|
ctrl |= I2C_NOSTOP | I2C_EXTEND;
|
|
|
|
cx_write(bus->reg_addr, addr);
|
|
cx_write(bus->reg_wdata, wdata);
|
|
cx_write(bus->reg_ctrl, ctrl);
|
|
|
|
retval = i2c_wait_done(i2c_adap);
|
|
if (retval < 0)
|
|
goto err;
|
|
if (retval == 0)
|
|
goto eio;
|
|
if (i2c_debug) {
|
|
printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
|
|
if (!(ctrl & I2C_NOSTOP))
|
|
printk(" >\n");
|
|
}
|
|
|
|
for (cnt = 1; cnt < msg->len; cnt++ ) {
|
|
/* following bytes */
|
|
wdata = msg->buf[cnt];
|
|
ctrl = bus->i2c_period | (1 << 12) | (1 << 2);
|
|
|
|
if (cnt < msg->len-1 || !last)
|
|
ctrl |= I2C_NOSTOP | I2C_EXTEND;
|
|
|
|
cx_write(bus->reg_addr, addr);
|
|
cx_write(bus->reg_wdata, wdata);
|
|
cx_write(bus->reg_ctrl, ctrl);
|
|
|
|
retval = i2c_wait_done(i2c_adap);
|
|
if (retval < 0)
|
|
goto err;
|
|
if (retval == 0)
|
|
goto eio;
|
|
if (i2c_debug) {
|
|
printk(" %02x", msg->buf[cnt]);
|
|
if (!(ctrl & I2C_NOSTOP))
|
|
printk(" >\n");
|
|
}
|
|
}
|
|
return msg->len;
|
|
|
|
eio:
|
|
retval = -EIO;
|
|
err:
|
|
printk(" ERR: %d\n", retval);
|
|
return retval;
|
|
}
|
|
|
|
static int i2c_readbytes(struct i2c_adapter *i2c_adap,
|
|
const struct i2c_msg *msg, int last)
|
|
{
|
|
struct cx23885_i2c *bus = i2c_adap->algo_data;
|
|
struct cx23885_dev *dev = bus->dev;
|
|
u32 ctrl, cnt;
|
|
int retval;
|
|
|
|
dprintk(1, "%s()\n", __FUNCTION__);
|
|
|
|
/* Deal with i2c probe functions with zero payload */
|
|
if (msg->len == 0) {
|
|
cx_write(bus->reg_addr, msg->addr << 25);
|
|
cx_write(bus->reg_ctrl, bus->i2c_period | (1 << 2) | 1);
|
|
if (!i2c_wait_done(i2c_adap))
|
|
return -EIO;
|
|
if (!i2c_slave_did_ack(i2c_adap))
|
|
return -EIO;
|
|
|
|
|
|
dprintk(1, "%s() returns 0\n", __FUNCTION__);
|
|
return 0;
|
|
}
|
|
|
|
for(cnt = 0; cnt < msg->len; cnt++) {
|
|
|
|
ctrl = bus->i2c_period | (1 << 12) | (1 << 2) | 1;
|
|
|
|
if (cnt < msg->len-1 || !last)
|
|
ctrl |= I2C_NOSTOP | I2C_EXTEND;
|
|
|
|
cx_write(bus->reg_addr, msg->addr << 25);
|
|
cx_write(bus->reg_ctrl, ctrl);
|
|
|
|
retval = i2c_wait_done(i2c_adap);
|
|
if (retval < 0)
|
|
goto err;
|
|
if (retval == 0)
|
|
goto eio;
|
|
msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
|
|
if (i2c_debug) {
|
|
if (!(ctrl & I2C_NOSTOP))
|
|
printk(" <R %02x", (msg->addr << 1) +1);
|
|
printk(" =%02x", msg->buf[cnt]);
|
|
if (!(ctrl & I2C_NOSTOP))
|
|
printk(" >\n");
|
|
}
|
|
}
|
|
return msg->len;
|
|
|
|
eio:
|
|
retval = -EIO;
|
|
err:
|
|
printk(" ERR: %d\n", retval);
|
|
return retval;
|
|
}
|
|
|
|
static int i2c_xfer(struct i2c_adapter *i2c_adap,
|
|
struct i2c_msg *msgs, int num)
|
|
{
|
|
struct cx23885_i2c *bus = i2c_adap->algo_data;
|
|
struct cx23885_dev *dev = bus->dev;
|
|
int i, retval = 0;
|
|
|
|
dprintk(1, "%s(num = %d)\n", __FUNCTION__, num);
|
|
|
|
for (i = 0 ; i < num; i++) {
|
|
dprintk(1, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
|
|
__FUNCTION__, num, msgs[i].addr, msgs[i].len);
|
|
if (msgs[i].flags & I2C_M_RD) {
|
|
/* read */
|
|
retval = i2c_readbytes(i2c_adap, &msgs[i], i+1 == num);
|
|
if (retval < 0)
|
|
goto err;
|
|
} else {
|
|
/* write */
|
|
retval = i2c_sendbytes(i2c_adap, &msgs[i], i+1 == num);
|
|
if (retval < 0)
|
|
goto err;
|
|
}
|
|
}
|
|
return num;
|
|
|
|
err:
|
|
return retval;
|
|
}
|
|
|
|
static int attach_inform(struct i2c_client *client)
|
|
{
|
|
struct cx23885_dev *dev = i2c_get_adapdata(client->adapter);
|
|
|
|
dprintk(1, "%s i2c attach [addr=0x%x,client=%s]\n",
|
|
client->driver->driver.name, client->addr, client->name);
|
|
|
|
if (!client->driver->command)
|
|
return 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int detach_inform(struct i2c_client *client)
|
|
{
|
|
struct cx23885_dev *dev = i2c_get_adapdata(client->adapter);
|
|
|
|
dprintk(1, "i2c detach [client=%s]\n", client->name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void cx23885_call_i2c_clients(struct cx23885_i2c *bus,
|
|
unsigned int cmd, void *arg)
|
|
{
|
|
if (bus->i2c_rc != 0)
|
|
return;
|
|
|
|
i2c_clients_command(&bus->i2c_adap, cmd, arg);
|
|
}
|
|
|
|
static u32 cx23885_functionality(struct i2c_adapter *adap)
|
|
{
|
|
return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
|
|
}
|
|
|
|
static struct i2c_algorithm cx23885_i2c_algo_template = {
|
|
.master_xfer = i2c_xfer,
|
|
.functionality = cx23885_functionality,
|
|
};
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static struct i2c_adapter cx23885_i2c_adap_template = {
|
|
.name = "cx23885",
|
|
.owner = THIS_MODULE,
|
|
.id = I2C_HW_B_CX23885,
|
|
.algo = &cx23885_i2c_algo_template,
|
|
.client_register = attach_inform,
|
|
.client_unregister = detach_inform,
|
|
};
|
|
|
|
static struct i2c_client cx23885_i2c_client_template = {
|
|
.name = "cx23885 internal",
|
|
};
|
|
|
|
static char *i2c_devs[128] = {
|
|
[ 0x1c >> 1 ] = "lgdt3303",
|
|
[ 0x86 >> 1 ] = "tda9887",
|
|
[ 0x32 >> 1 ] = "cx24227",
|
|
[ 0x88 >> 1 ] = "cx25837",
|
|
[ 0x84 >> 1 ] = "tda8295",
|
|
[ 0xa0 >> 1 ] = "eeprom",
|
|
[ 0xc0 >> 1 ] = "tuner/mt2131/tda8275",
|
|
[ 0xc2 >> 1 ] = "tuner/mt2131/tda8275",
|
|
};
|
|
|
|
static void do_i2c_scan(char *name, struct i2c_client *c)
|
|
{
|
|
unsigned char buf;
|
|
int i, rc;
|
|
|
|
for (i = 0; i < 128; i++) {
|
|
c->addr = i;
|
|
rc = i2c_master_recv(c, &buf, 0);
|
|
if (rc < 0)
|
|
continue;
|
|
printk("%s: i2c scan: found device @ 0x%x [%s]\n",
|
|
name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
|
|
}
|
|
}
|
|
|
|
/* init + register i2c algo-bit adapter */
|
|
int cx23885_i2c_register(struct cx23885_i2c *bus)
|
|
{
|
|
struct cx23885_dev *dev = bus->dev;
|
|
|
|
dprintk(1, "%s(bus = %d)\n", __FUNCTION__, bus->nr);
|
|
|
|
memcpy(&bus->i2c_adap, &cx23885_i2c_adap_template,
|
|
sizeof(bus->i2c_adap));
|
|
memcpy(&bus->i2c_algo, &cx23885_i2c_algo_template,
|
|
sizeof(bus->i2c_algo));
|
|
memcpy(&bus->i2c_client, &cx23885_i2c_client_template,
|
|
sizeof(bus->i2c_client));
|
|
|
|
bus->i2c_adap.dev.parent = &dev->pci->dev;
|
|
|
|
strlcpy(bus->i2c_adap.name, bus->dev->name,
|
|
sizeof(bus->i2c_adap.name));
|
|
|
|
bus->i2c_algo.data = bus;
|
|
bus->i2c_adap.algo_data = bus;
|
|
i2c_add_adapter(&bus->i2c_adap);
|
|
|
|
bus->i2c_client.adapter = &bus->i2c_adap;
|
|
|
|
if (0 == bus->i2c_rc) {
|
|
printk("%s: i2c bus %d registered\n", dev->name, bus->nr);
|
|
if (i2c_scan)
|
|
do_i2c_scan(dev->name, &bus->i2c_client);
|
|
} else
|
|
printk("%s: i2c bus %d register FAILED\n", dev->name, bus->nr);
|
|
|
|
return bus->i2c_rc;
|
|
}
|
|
|
|
int cx23885_i2c_unregister(struct cx23885_i2c *bus)
|
|
{
|
|
i2c_del_adapter(&bus->i2c_adap);
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
EXPORT_SYMBOL(cx23885_call_i2c_clients);
|
|
|
|
/*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|