Commit | Line | Data |
---|---|---|
443c1228 ST |
1 | /* |
2 | * Driver for the NXP SAA7164 PCIe bridge | |
3 | * | |
9b8b0199 | 4 | * Copyright (c) 2010 Steven Toth <stoth@kernellabs.com> |
443c1228 ST |
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 <asm/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 | ||
443c1228 ST |
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 | ||
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, | |
443c1228 | 96 | .algo = &saa7164_i2c_algo_template, |
443c1228 ST |
97 | }; |
98 | ||
99 | static struct i2c_client saa7164_i2c_client_template = { | |
100 | .name = "saa7164 internal", | |
101 | }; | |
102 | ||
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 | ||
b8298e7e | 130 | if (0 != bus->i2c_rc) |
443c1228 ST |
131 | printk(KERN_ERR "%s: i2c bus %d register FAILED\n", |
132 | dev->name, bus->nr); | |
133 | ||
134 | return bus->i2c_rc; | |
135 | } | |
136 | ||
137 | int saa7164_i2c_unregister(struct saa7164_i2c *bus) | |
138 | { | |
139 | i2c_del_adapter(&bus->i2c_adap); | |
140 | return 0; | |
141 | } |