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
i2c_xfer(struct i2c_adapter * i2c_adap,struct i2c_msg * msgs,int num)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
saa7164_call_i2c_clients(struct saa7164_i2c * bus,unsigned int cmd,void * arg)72 void 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
saa7164_functionality(struct i2c_adapter * adap)81 static u32 saa7164_functionality(struct i2c_adapter *adap)
82 {
83 return I2C_FUNC_I2C;
84 }
85
86 static struct i2c_algorithm saa7164_i2c_algo_template = {
87 .master_xfer = i2c_xfer,
88 .functionality = saa7164_functionality,
89 };
90
91 /* ----------------------------------------------------------------------- */
92
93 static struct i2c_adapter saa7164_i2c_adap_template = {
94 .name = "saa7164",
95 .owner = THIS_MODULE,
96 .algo = &saa7164_i2c_algo_template,
97 };
98
99 static struct i2c_client saa7164_i2c_client_template = {
100 .name = "saa7164 internal",
101 };
102
saa7164_i2c_register(struct saa7164_i2c * bus)103 int 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
saa7164_i2c_unregister(struct saa7164_i2c * bus)137 int saa7164_i2c_unregister(struct saa7164_i2c *bus)
138 {
139 i2c_del_adapter(&bus->i2c_adap);
140 return 0;
141 }
142