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 
30 static 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 
68 err:
69 	return retval;
70 }
71 
72 static u32 saa7164_functionality(struct i2c_adapter *adap)
73 {
74 	return I2C_FUNC_I2C;
75 }
76 
77 static struct i2c_algorithm saa7164_i2c_algo_template = {
78 	.master_xfer	= i2c_xfer,
79 	.functionality	= saa7164_functionality,
80 };
81 
82 /* ----------------------------------------------------------------------- */
83 
84 static struct i2c_adapter saa7164_i2c_adap_template = {
85 	.name              = "saa7164",
86 	.owner             = THIS_MODULE,
87 	.algo              = &saa7164_i2c_algo_template,
88 };
89 
90 static struct i2c_client saa7164_i2c_client_template = {
91 	.name	= "saa7164 internal",
92 };
93 
94 int saa7164_i2c_register(struct saa7164_i2c *bus)
95 {
96 	struct saa7164_dev *dev = bus->dev;
97 
98 	dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr);
99 
100 	bus->i2c_adap = saa7164_i2c_adap_template;
101 	bus->i2c_client = saa7164_i2c_client_template;
102 
103 	bus->i2c_adap.dev.parent = &dev->pci->dev;
104 
105 	strlcpy(bus->i2c_adap.name, bus->dev->name,
106 		sizeof(bus->i2c_adap.name));
107 
108 	bus->i2c_adap.algo_data = bus;
109 	i2c_set_adapdata(&bus->i2c_adap, bus);
110 	i2c_add_adapter(&bus->i2c_adap);
111 
112 	bus->i2c_client.adapter = &bus->i2c_adap;
113 
114 	if (0 != bus->i2c_rc)
115 		printk(KERN_ERR "%s: i2c bus %d register FAILED\n",
116 			dev->name, bus->nr);
117 
118 	return bus->i2c_rc;
119 }
120 
121 int saa7164_i2c_unregister(struct saa7164_i2c *bus)
122 {
123 	i2c_del_adapter(&bus->i2c_adap);
124 	return 0;
125 }
126