| /* |
| * i2c-boardinfo.c - collect pre-declarations of I2C devices |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| * MA 02110-1301 USA. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/i2c.h> |
| #include <linux/slab.h> |
| #include <linux/export.h> |
| #include <linux/rwsem.h> |
| |
| #include "i2c-core.h" |
| |
| |
| /* These symbols are exported ONLY FOR the i2c core. |
| * No other users will be supported. |
| */ |
| DECLARE_RWSEM(__i2c_board_lock); |
| EXPORT_SYMBOL_GPL(__i2c_board_lock); |
| |
| LIST_HEAD(__i2c_board_list); |
| EXPORT_SYMBOL_GPL(__i2c_board_list); |
| |
| int __i2c_first_dynamic_bus_num; |
| EXPORT_SYMBOL_GPL(__i2c_first_dynamic_bus_num); |
| |
| |
| /** |
| * i2c_register_board_info - statically declare I2C devices |
| * @busnum: identifies the bus to which these devices belong |
| * @info: vector of i2c device descriptors |
| * @len: how many descriptors in the vector; may be zero to reserve |
| * the specified bus number. |
| * |
| * Systems using the Linux I2C driver stack can declare tables of board info |
| * while they initialize. This should be done in board-specific init code |
| * near arch_initcall() time, or equivalent, before any I2C adapter driver is |
| * registered. For example, mainboard init code could define several devices, |
| * as could the init code for each daughtercard in a board stack. |
| * |
| * The I2C devices will be created later, after the adapter for the relevant |
| * bus has been registered. After that moment, standard driver model tools |
| * are used to bind "new style" I2C drivers to the devices. The bus number |
| * for any device declared using this routine is not available for dynamic |
| * allocation. |
| * |
| * The board info passed can safely be __initdata, but be careful of embedded |
| * pointers (for platform_data, functions, etc) since that won't be copied. |
| */ |
| int __init |
| i2c_register_board_info(int busnum, |
| struct i2c_board_info const *info, unsigned len) |
| { |
| int status; |
| |
| down_write(&__i2c_board_lock); |
| |
| /* dynamic bus numbers will be assigned after the last static one */ |
| if (busnum >= __i2c_first_dynamic_bus_num) |
| __i2c_first_dynamic_bus_num = busnum + 1; |
| |
| for (status = 0; len; len--, info++) { |
| struct i2c_devinfo *devinfo; |
| |
| devinfo = kzalloc(sizeof(*devinfo), GFP_KERNEL); |
| if (!devinfo) { |
| pr_debug("i2c-core: can't register boardinfo!\n"); |
| status = -ENOMEM; |
| break; |
| } |
| |
| devinfo->busnum = busnum; |
| devinfo->board_info = *info; |
| list_add_tail(&devinfo->list, &__i2c_board_list); |
| } |
| |
| up_write(&__i2c_board_lock); |
| |
| return status; |
| } |