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}
142