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1 | /* |
2 | * i2c-boardinfo.c - collect pre-declarations of I2C devices |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by |
6 | * the Free Software Foundation; either version 2 of the License, or |
7 | * (at your option) any later version. |
8 | * |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | */ |
14 | |
15 | #include <linux/kernel.h> |
16 | #include <linux/i2c.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/export.h> |
19 | #include <linux/rwsem.h> |
20 | |
21 | #include "i2c-core.h" |
22 | |
23 | |
24 | /* These symbols are exported ONLY FOR the i2c core. |
25 | * No other users will be supported. |
26 | */ |
27 | DECLARE_RWSEM(__i2c_board_lock); |
28 | EXPORT_SYMBOL_GPL(__i2c_board_lock); |
29 | |
30 | LIST_HEAD(__i2c_board_list); |
31 | EXPORT_SYMBOL_GPL(__i2c_board_list); |
32 | |
33 | int __i2c_first_dynamic_bus_num; |
34 | EXPORT_SYMBOL_GPL(__i2c_first_dynamic_bus_num); |
35 | |
36 | |
37 | /** |
38 | * i2c_register_board_info - statically declare I2C devices |
39 | * @busnum: identifies the bus to which these devices belong |
40 | * @info: vector of i2c device descriptors |
41 | * @len: how many descriptors in the vector; may be zero to reserve |
42 | * the specified bus number. |
43 | * |
44 | * Systems using the Linux I2C driver stack can declare tables of board info |
45 | * while they initialize. This should be done in board-specific init code |
46 | * near arch_initcall() time, or equivalent, before any I2C adapter driver is |
47 | * registered. For example, mainboard init code could define several devices, |
48 | * as could the init code for each daughtercard in a board stack. |
49 | * |
50 | * The I2C devices will be created later, after the adapter for the relevant |
51 | * bus has been registered. After that moment, standard driver model tools |
52 | * are used to bind "new style" I2C drivers to the devices. The bus number |
53 | * for any device declared using this routine is not available for dynamic |
54 | * allocation. |
55 | * |
56 | * The board info passed can safely be __initdata, but be careful of embedded |
57 | * pointers (for platform_data, functions, etc) since that won't be copied. |
58 | */ |
59 | int __init |
60 | i2c_register_board_info(int busnum, |
61 | struct i2c_board_info const *info, unsigned len) |
62 | { |
63 | int status; |
64 | |
65 | down_write(&__i2c_board_lock); |
66 | |
67 | /* dynamic bus numbers will be assigned after the last static one */ |
68 | if (busnum >= __i2c_first_dynamic_bus_num) |
69 | __i2c_first_dynamic_bus_num = busnum + 1; |
70 | |
71 | for (status = 0; len; len--, info++) { |
72 | struct i2c_devinfo *devinfo; |
73 | |
74 | devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL); |
75 | if (!devinfo) { |
76 | pr_debug("i2c-core: can't register boardinfo!\n"); |
77 | status = -ENOMEM; |
78 | break; |
79 | } |
80 | |
81 | devinfo->busnum = busnum; |
82 | devinfo->board_info = *info; |
83 | list_add_tail(&devinfo->list, &__i2c_board_list); |
84 | } |
85 | |
86 | up_write(&__i2c_board_lock); |
87 | |
88 | return status; |
89 | } |
90 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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