/* * Driver for the NXP SAA7164 PCIe bridge * * Copyright (c) 2009 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. * * 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 "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) { /* Unsupported - Yet*/ printk(KERN_ERR "%s() Unsupported - Yet\n", __func__); continue; } 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; } void saa7164_call_i2c_clients(struct saa7164_i2c *bus, unsigned int cmd, void *arg) { if (bus->i2c_rc != 0) return; i2c_clients_command(&bus->i2c_adap, cmd, arg); } static u32 saa7164_functionality(struct i2c_adapter *adap) { return I2C_FUNC_I2C; } static struct i2c_algorithm saa7164_i2c_algo_template = { .master_xfer = i2c_xfer, .functionality = saa7164_functionality, }; /* ----------------------------------------------------------------------- */ static struct i2c_adapter saa7164_i2c_adap_template = { .name = "saa7164", .owner = THIS_MODULE, .algo = &saa7164_i2c_algo_template, }; static 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); memcpy(&bus->i2c_adap, &saa7164_i2c_adap_template, sizeof(bus->i2c_adap)); memcpy(&bus->i2c_algo, &saa7164_i2c_algo_template, sizeof(bus->i2c_algo)); memcpy(&bus->i2c_client, &saa7164_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_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; }