1/*
  2 *  Driver for the NXP SAA7164 PCIe bridge
  3 *
  4 *  Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
  5 *
  6 *  This program is free software; you can redistribute it and/or modify
  7 *  it under the terms of the GNU General Public License as published by
  8 *  the Free Software Foundation; either version 2 of the License, or
  9 *  (at your option) any later version.
 10 *
 11 *  This program is distributed in the hope that it will be useful,
 12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 *
 15 *  GNU General Public License for more details.
 16 *
 17 *  You should have received a copy of the GNU General Public License
 18 *  along with this program; if not, write to the Free Software
 19 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 20 */
 21
 22#include <linux/module.h>
 23#include <linux/moduleparam.h>
 24#include <linux/init.h>
 25#include <linux/delay.h>
 26#include <linux/io.h>
 27
 28#include "saa7164.h"
 29
 30static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num)
 31{
 32	struct saa7164_i2c *bus = i2c_adap->algo_data;
 33	struct saa7164_dev *dev = bus->dev;
 34	int i, retval = 0;
 35
 36	dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num);
 37
 38	for (i = 0 ; i < num; i++) {
 39		dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x  len = 0x%x\n",
 40			__func__, num, msgs[i].addr, msgs[i].len);
 41		if (msgs[i].flags & I2C_M_RD) {
 42			/* Unsupported - Yet*/
 43			printk(KERN_ERR "%s() Unsupported - Yet\n", __func__);
 44			continue;
 45		} else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) &&
 46			   msgs[i].addr == msgs[i + 1].addr) {
 47			/* write then read from same address */
 48
 49			retval = saa7164_api_i2c_read(bus, msgs[i].addr,
 50				msgs[i].len, msgs[i].buf,
 51				msgs[i+1].len, msgs[i+1].buf
 52				);
 53
 54			i++;
 55
 56			if (retval < 0)
 57				goto err;
 58		} else {
 59			/* write */
 60			retval = saa7164_api_i2c_write(bus, msgs[i].addr,
 61				msgs[i].len, msgs[i].buf);
 62		}
 63		if (retval < 0)
 64			goto err;
 65	}
 66	return num;
 67
 68err:
 69	return retval;
 70}
 71
 72void saa7164_call_i2c_clients(struct saa7164_i2c *bus, unsigned int cmd,
 73	void *arg)
 74{
 75	if (bus->i2c_rc != 0)
 76		return;
 77
 78	i2c_clients_command(&bus->i2c_adap, cmd, arg);
 79}
 80
 81static u32 saa7164_functionality(struct i2c_adapter *adap)
 82{
 83	return I2C_FUNC_I2C;
 84}
 85
 86static struct i2c_algorithm saa7164_i2c_algo_template = {
 87	.master_xfer	= i2c_xfer,
 88	.functionality	= saa7164_functionality,
 89};
 90
 91/* ----------------------------------------------------------------------- */
 92
 93static struct i2c_adapter saa7164_i2c_adap_template = {
 94	.name              = "saa7164",
 95	.owner             = THIS_MODULE,
 96	.algo              = &saa7164_i2c_algo_template,
 97};
 98
 99static struct i2c_client saa7164_i2c_client_template = {
100	.name	= "saa7164 internal",
101};
102
103int saa7164_i2c_register(struct saa7164_i2c *bus)
104{
105	struct saa7164_dev *dev = bus->dev;
106
107	dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
108
109	memcpy(&bus->i2c_adap, &saa7164_i2c_adap_template,
110	       sizeof(bus->i2c_adap));
111
112	memcpy(&bus->i2c_algo, &saa7164_i2c_algo_template,
113	       sizeof(bus->i2c_algo));
114
115	memcpy(&bus->i2c_client, &saa7164_i2c_client_template,
116	       sizeof(bus->i2c_client));
117
118	bus->i2c_adap.dev.parent = &dev->pci->dev;
119
120	strlcpy(bus->i2c_adap.name, bus->dev->name,
121		sizeof(bus->i2c_adap.name));
122
123	bus->i2c_algo.data = bus;
124	bus->i2c_adap.algo_data = bus;
125	i2c_set_adapdata(&bus->i2c_adap, bus);
126	i2c_add_adapter(&bus->i2c_adap);
127
128	bus->i2c_client.adapter = &bus->i2c_adap;
129
130	if (0 != bus->i2c_rc)
131		printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
132			dev->name, bus->nr);
133
134	return bus->i2c_rc;
135}
136
137int saa7164_i2c_unregister(struct saa7164_i2c *bus)
138{
139	i2c_del_adapter(&bus->i2c_adap);
140	return 0;
141}