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8ffbc655 HV |
1 | /* |
2 | * v4l2-i2c-drv-legacy.h - contains I2C handling code that's identical | |
3 | * for all V4L2 I2C drivers. Use this header if the | |
4 | * I2C driver is used by both legacy drivers and | |
5 | * drivers converted to the bus-based I2C API. | |
6 | * | |
7 | * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
7b31b57a HV |
24 | /* NOTE: the full version of this header is in the v4l-dvb repository |
25 | * and allows v4l i2c drivers to be compiled on older kernels as well. | |
26 | * The version of this header as it appears in the kernel is a stripped | |
27 | * version (without all the backwards compatibility stuff) and so it | |
28 | * looks a bit odd. | |
29 | * | |
30 | * If you look at the full version then you will understand the reason | |
31 | * for introducing this header since you really don't want to have all | |
32 | * the tricky backwards compatibility code in each and every i2c driver. | |
33 | */ | |
34 | ||
8ffbc655 HV |
35 | struct v4l2_i2c_driver_data { |
36 | const char * const name; | |
37 | int driverid; | |
38 | int (*command)(struct i2c_client *client, unsigned int cmd, void *arg); | |
d2653e92 | 39 | int (*probe)(struct i2c_client *client, const struct i2c_device_id *id); |
8ffbc655 HV |
40 | int (*remove)(struct i2c_client *client); |
41 | int (*suspend)(struct i2c_client *client, pm_message_t state); | |
42 | int (*resume)(struct i2c_client *client); | |
88307eb3 | 43 | int (*legacy_probe)(struct i2c_adapter *adapter); |
8ffbc655 | 44 | int legacy_class; |
ae429083 | 45 | const struct i2c_device_id *id_table; |
8ffbc655 HV |
46 | }; |
47 | ||
48 | static struct v4l2_i2c_driver_data v4l2_i2c_data; | |
bfb6df24 | 49 | static const struct i2c_client_address_data addr_data; |
8ffbc655 HV |
50 | static struct i2c_driver v4l2_i2c_driver_legacy; |
51 | static char v4l2_i2c_drv_name_legacy[32]; | |
52 | ||
53 | static int v4l2_i2c_drv_attach_legacy(struct i2c_adapter *adapter, int address, int kind) | |
54 | { | |
55 | return v4l2_i2c_attach(adapter, address, &v4l2_i2c_driver_legacy, | |
56 | v4l2_i2c_drv_name_legacy, v4l2_i2c_data.probe); | |
57 | } | |
58 | ||
59 | static int v4l2_i2c_drv_probe_legacy(struct i2c_adapter *adapter) | |
60 | { | |
88307eb3 HV |
61 | if (v4l2_i2c_data.legacy_probe) { |
62 | if (v4l2_i2c_data.legacy_probe(adapter)) | |
63 | return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy); | |
64 | return 0; | |
65 | } | |
8ffbc655 HV |
66 | if (adapter->class & v4l2_i2c_data.legacy_class) |
67 | return i2c_probe(adapter, &addr_data, v4l2_i2c_drv_attach_legacy); | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static int v4l2_i2c_drv_detach_legacy(struct i2c_client *client) | |
72 | { | |
a2e521e8 | 73 | int err; |
8ffbc655 | 74 | |
8ffbc655 HV |
75 | if (v4l2_i2c_data.remove) |
76 | v4l2_i2c_data.remove(client); | |
a2e521e8 HV |
77 | |
78 | err = i2c_detach_client(client); | |
79 | if (err) | |
80 | return err; | |
8ffbc655 | 81 | kfree(client); |
8ffbc655 HV |
82 | return 0; |
83 | } | |
84 | ||
85 | static int v4l2_i2c_drv_suspend_helper(struct i2c_client *client, pm_message_t state) | |
86 | { | |
87 | return v4l2_i2c_data.suspend ? v4l2_i2c_data.suspend(client, state) : 0; | |
88 | } | |
89 | ||
90 | static int v4l2_i2c_drv_resume_helper(struct i2c_client *client) | |
91 | { | |
92 | return v4l2_i2c_data.resume ? v4l2_i2c_data.resume(client) : 0; | |
93 | } | |
94 | ||
95 | /* ----------------------------------------------------------------------- */ | |
96 | ||
97 | /* i2c implementation */ | |
98 | static struct i2c_driver v4l2_i2c_driver_legacy = { | |
99 | .driver = { | |
100 | .owner = THIS_MODULE, | |
101 | }, | |
102 | .attach_adapter = v4l2_i2c_drv_probe_legacy, | |
103 | .detach_client = v4l2_i2c_drv_detach_legacy, | |
104 | .suspend = v4l2_i2c_drv_suspend_helper, | |
105 | .resume = v4l2_i2c_drv_resume_helper, | |
106 | }; | |
107 | ||
108 | /* ----------------------------------------------------------------------- */ | |
109 | ||
110 | /* i2c implementation */ | |
111 | static struct i2c_driver v4l2_i2c_driver = { | |
112 | .suspend = v4l2_i2c_drv_suspend_helper, | |
113 | .resume = v4l2_i2c_drv_resume_helper, | |
114 | }; | |
115 | ||
116 | static int __init v4l2_i2c_drv_init(void) | |
117 | { | |
118 | int err; | |
119 | ||
120 | strlcpy(v4l2_i2c_drv_name_legacy, v4l2_i2c_data.name, sizeof(v4l2_i2c_drv_name_legacy)); | |
121 | strlcat(v4l2_i2c_drv_name_legacy, "'", sizeof(v4l2_i2c_drv_name_legacy)); | |
122 | ||
123 | if (v4l2_i2c_data.legacy_class == 0) | |
124 | v4l2_i2c_data.legacy_class = I2C_CLASS_TV_ANALOG; | |
125 | ||
126 | v4l2_i2c_driver_legacy.driver.name = v4l2_i2c_drv_name_legacy; | |
127 | v4l2_i2c_driver_legacy.id = v4l2_i2c_data.driverid; | |
128 | v4l2_i2c_driver_legacy.command = v4l2_i2c_data.command; | |
129 | err = i2c_add_driver(&v4l2_i2c_driver_legacy); | |
130 | ||
131 | if (err) | |
132 | return err; | |
133 | v4l2_i2c_driver.driver.name = v4l2_i2c_data.name; | |
134 | v4l2_i2c_driver.id = v4l2_i2c_data.driverid; | |
135 | v4l2_i2c_driver.command = v4l2_i2c_data.command; | |
136 | v4l2_i2c_driver.probe = v4l2_i2c_data.probe; | |
137 | v4l2_i2c_driver.remove = v4l2_i2c_data.remove; | |
ae429083 | 138 | v4l2_i2c_driver.id_table = v4l2_i2c_data.id_table; |
8ffbc655 HV |
139 | err = i2c_add_driver(&v4l2_i2c_driver); |
140 | if (err) | |
141 | i2c_del_driver(&v4l2_i2c_driver_legacy); | |
142 | return err; | |
143 | } | |
144 | ||
145 | static void __exit v4l2_i2c_drv_cleanup(void) | |
146 | { | |
147 | i2c_del_driver(&v4l2_i2c_driver_legacy); | |
148 | i2c_del_driver(&v4l2_i2c_driver); | |
149 | } | |
150 | ||
151 | module_init(v4l2_i2c_drv_init); | |
152 | module_exit(v4l2_i2c_drv_cleanup); |