113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for the NXP SAA7164 PCIe bridge
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*
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* Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
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*/
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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 "saa7164.h"
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static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
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{
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struct saa7164_i2c *bus = i2c_adap->algo_data;
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struct saa7164_dev *dev = bus->dev;
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int i, retval = 0;
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dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num);
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for (i = 0 ; i < num; i++) {
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dprintk(DBGLVL_I2C, "%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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retval = saa7164_api_i2c_read(bus,
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msgs[i].addr,
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0 /* reglen */,
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NULL /* reg */, msgs[i].len, msgs[i].buf);
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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 = saa7164_api_i2c_read(bus, msgs[i].addr,
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msgs[i].len, msgs[i].buf,
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msgs[i+1].len, msgs[i+1].buf
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);
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i++;
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if (retval < 0)
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goto err;
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} else {
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/* write */
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retval = saa7164_api_i2c_write(bus, msgs[i].addr,
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msgs[i].len, msgs[i].buf);
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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 saa7164_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C;
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}
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static const struct i2c_algorithm saa7164_i2c_algo_template = {
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.master_xfer = i2c_xfer,
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.functionality = saa7164_functionality,
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};
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/* ----------------------------------------------------------------------- */
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static const struct i2c_adapter saa7164_i2c_adap_template = {
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.name = "saa7164",
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.owner = THIS_MODULE,
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.algo = &saa7164_i2c_algo_template,
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};
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static const struct i2c_client saa7164_i2c_client_template = {
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.name = "saa7164 internal",
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};
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int saa7164_i2c_register(struct saa7164_i2c *bus)
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{
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struct saa7164_dev *dev = bus->dev;
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dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
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bus->i2c_adap = saa7164_i2c_adap_template;
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bus->i2c_client = saa7164_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, bus);
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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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printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
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dev->name, bus->nr);
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return bus->i2c_rc;
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}
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int saa7164_i2c_unregister(struct saa7164_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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