123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
|
/*
|
||
|
|
* Driver for the NXP SAA7164 PCIe bridge
|
||
|
|
*
|
||
|
|
* Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.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 <linux/module.h>
|
||
|
|
#include <linux/moduleparam.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
|
||
|
|
#include "saa7164.h"
|
||
|
|
|
||
|
|
static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
|
||
|
|
{
|
||
|
|
struct saa7164_i2c *bus = i2c_adap->algo_data;
|
||
|
|
struct saa7164_dev *dev = bus->dev;
|
||
|
|
int i, retval = 0;
|
||
|
|
|
||
|
|
dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num);
|
||
|
|
|
||
|
|
for (i = 0 ; i < num; i++) {
|
||
|
|
dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x len = 0x%x\n",
|
||
|
|
__func__, num, msgs[i].addr, msgs[i].len);
|
||
|
|
if (msgs[i].flags & I2C_M_RD) {
|
||
|
|
retval = saa7164_api_i2c_read(bus,
|
||
|
|
msgs[i].addr,
|
||
|
|
0 /* reglen */,
|
||
|
|
NULL /* reg */, msgs[i].len, msgs[i].buf);
|
||
|
|
} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
|
||
|
|
msgs[i].addr == msgs[i + 1].addr) {
|
||
|
|
/* write then read from same address */
|
||
|
|
|
||
|
|
retval = saa7164_api_i2c_read(bus, msgs[i].addr,
|
||
|
|
msgs[i].len, msgs[i].buf,
|
||
|
|
msgs[i+1].len, msgs[i+1].buf
|
||
|
|
);
|
||
|
|
|
||
|
|
i++;
|
||
|
|
|
||
|
|
if (retval < 0)
|
||
|
|
goto err;
|
||
|
|
} else {
|
||
|
|
/* write */
|
||
|
|
retval = saa7164_api_i2c_write(bus, msgs[i].addr,
|
||
|
|
msgs[i].len, msgs[i].buf);
|
||
|
|
}
|
||
|
|
if (retval < 0)
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
return num;
|
||
|
|
|
||
|
|
err:
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
static u32 saa7164_functionality(struct i2c_adapter *adap)
|
||
|
|
{
|
||
|
|
return I2C_FUNC_I2C;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct i2c_algorithm saa7164_i2c_algo_template = {
|
||
|
|
.master_xfer = i2c_xfer,
|
||
|
|
.functionality = saa7164_functionality,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* ----------------------------------------------------------------------- */
|
||
|
|
|
||
|
|
static const struct i2c_adapter saa7164_i2c_adap_template = {
|
||
|
|
.name = "saa7164",
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.algo = &saa7164_i2c_algo_template,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct i2c_client saa7164_i2c_client_template = {
|
||
|
|
.name = "saa7164 internal",
|
||
|
|
};
|
||
|
|
|
||
|
|
int saa7164_i2c_register(struct saa7164_i2c *bus)
|
||
|
|
{
|
||
|
|
struct saa7164_dev *dev = bus->dev;
|
||
|
|
|
||
|
|
dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
|
||
|
|
|
||
|
|
bus->i2c_adap = saa7164_i2c_adap_template;
|
||
|
|
bus->i2c_client = saa7164_i2c_client_template;
|
||
|
|
|
||
|
|
bus->i2c_adap.dev.parent = &dev->pci->dev;
|
||
|
|
|
||
|
|
strlcpy(bus->i2c_adap.name, bus->dev->name,
|
||
|
|
sizeof(bus->i2c_adap.name));
|
||
|
|
|
||
|
|
bus->i2c_adap.algo_data = bus;
|
||
|
|
i2c_set_adapdata(&bus->i2c_adap, bus);
|
||
|
|
i2c_add_adapter(&bus->i2c_adap);
|
||
|
|
|
||
|
|
bus->i2c_client.adapter = &bus->i2c_adap;
|
||
|
|
|
||
|
|
if (0 != bus->i2c_rc)
|
||
|
|
printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
|
||
|
|
dev->name, bus->nr);
|
||
|
|
|
||
|
|
return bus->i2c_rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
int saa7164_i2c_unregister(struct saa7164_i2c *bus)
|
||
|
|
{
|
||
|
|
i2c_del_adapter(&bus->i2c_adap);
|
||
|
|
return 0;
|
||
|
|
}
|