Commit | Line | Data |
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443c1228 ST |
1 | /* |
2 | * Driver for the NXP SAA7164 PCIe bridge | |
3 | * | |
63a412ec | 4 | * Copyright (c) 2010-2015 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. | |
443c1228 ST |
16 | */ |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/moduleparam.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/delay.h> | |
bc250684 | 22 | #include <linux/io.h> |
443c1228 ST |
23 | |
24 | #include "saa7164.h" | |
25 | ||
26 | static int i2c_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) | |
27 | { | |
28 | struct saa7164_i2c *bus = i2c_adap->algo_data; | |
29 | struct saa7164_dev *dev = bus->dev; | |
30 | int i, retval = 0; | |
31 | ||
32 | dprintk(DBGLVL_I2C, "%s(num = %d)\n", __func__, num); | |
33 | ||
34 | for (i = 0 ; i < num; i++) { | |
35 | dprintk(DBGLVL_I2C, "%s(num = %d) addr = 0x%02x len = 0x%x\n", | |
36 | __func__, num, msgs[i].addr, msgs[i].len); | |
37 | if (msgs[i].flags & I2C_M_RD) { | |
5f954b5b ST |
38 | retval = saa7164_api_i2c_read(bus, |
39 | msgs[i].addr, | |
40 | 0 /* reglen */, | |
7071b2ea | 41 | NULL /* reg */, msgs[i].len, msgs[i].buf); |
443c1228 ST |
42 | } else if (i + 1 < num && (msgs[i + 1].flags & I2C_M_RD) && |
43 | msgs[i].addr == msgs[i + 1].addr) { | |
44 | /* write then read from same address */ | |
45 | ||
46 | retval = saa7164_api_i2c_read(bus, msgs[i].addr, | |
47 | msgs[i].len, msgs[i].buf, | |
48 | msgs[i+1].len, msgs[i+1].buf | |
49 | ); | |
50 | ||
51 | i++; | |
52 | ||
53 | if (retval < 0) | |
54 | goto err; | |
55 | } else { | |
56 | /* write */ | |
57 | retval = saa7164_api_i2c_write(bus, msgs[i].addr, | |
58 | msgs[i].len, msgs[i].buf); | |
59 | } | |
60 | if (retval < 0) | |
61 | goto err; | |
62 | } | |
63 | return num; | |
64 | ||
bc250684 | 65 | err: |
443c1228 ST |
66 | return retval; |
67 | } | |
68 | ||
443c1228 ST |
69 | static u32 saa7164_functionality(struct i2c_adapter *adap) |
70 | { | |
71 | return I2C_FUNC_I2C; | |
72 | } | |
73 | ||
78f2c50b | 74 | static const struct i2c_algorithm saa7164_i2c_algo_template = { |
443c1228 ST |
75 | .master_xfer = i2c_xfer, |
76 | .functionality = saa7164_functionality, | |
77 | }; | |
78 | ||
79 | /* ----------------------------------------------------------------------- */ | |
80 | ||
e5fffebe | 81 | static const struct i2c_adapter saa7164_i2c_adap_template = { |
443c1228 ST |
82 | .name = "saa7164", |
83 | .owner = THIS_MODULE, | |
443c1228 | 84 | .algo = &saa7164_i2c_algo_template, |
443c1228 ST |
85 | }; |
86 | ||
b8e9b36d | 87 | static const struct i2c_client saa7164_i2c_client_template = { |
443c1228 ST |
88 | .name = "saa7164 internal", |
89 | }; | |
90 | ||
91 | int saa7164_i2c_register(struct saa7164_i2c *bus) | |
92 | { | |
93 | struct saa7164_dev *dev = bus->dev; | |
94 | ||
95 | dprintk(DBGLVL_I2C, "%s(bus = %d)\n", __func__, bus->nr); | |
96 | ||
ddebe8cd EG |
97 | bus->i2c_adap = saa7164_i2c_adap_template; |
98 | bus->i2c_client = saa7164_i2c_client_template; | |
443c1228 ST |
99 | |
100 | bus->i2c_adap.dev.parent = &dev->pci->dev; | |
101 | ||
c0decac1 | 102 | strscpy(bus->i2c_adap.name, bus->dev->name, |
443c1228 ST |
103 | sizeof(bus->i2c_adap.name)); |
104 | ||
443c1228 ST |
105 | bus->i2c_adap.algo_data = bus; |
106 | i2c_set_adapdata(&bus->i2c_adap, bus); | |
107 | i2c_add_adapter(&bus->i2c_adap); | |
108 | ||
109 | bus->i2c_client.adapter = &bus->i2c_adap; | |
110 | ||
b8298e7e | 111 | if (0 != bus->i2c_rc) |
443c1228 ST |
112 | printk(KERN_ERR "%s: i2c bus %d register FAILED\n", |
113 | dev->name, bus->nr); | |
114 | ||
115 | return bus->i2c_rc; | |
116 | } | |
117 | ||
118 | int saa7164_i2c_unregister(struct saa7164_i2c *bus) | |
119 | { | |
120 | i2c_del_adapter(&bus->i2c_adap); | |
121 | return 0; | |
122 | } |