mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-29 23:53:32 +00:00
9c1600eda4
This provides partial support for new-style I2C driver binding. It builds on "struct i2c_board_info" declarations that identify I2C devices on a given board. This is needed on systems with I2C devices that can't be fully probed and/or autoconfigured, such as many embedded Linux configurations where the way a given I2C device is wired may affect how it must be used. There are two models for declaring such devices: * LATE -- using a public function i2c_new_device(). This lets modules declare I2C devices found *AFTER* a given I2C adapter becomes available. For example, a PCI card could create adapters giving access to utility chips on that card, and this would be used to associate those chips with those adapters. * EARLY -- from arch_initcall() level code, using a non-exported function i2c_register_board_info(). This copies the declarations *BEFORE* such an i2c_adapter becomes available, arranging that i2c_new_device() will be called later when i2c-core registers the relevant i2c_adapter. For example, arch/.../.../board-*.c files would declare the I2C devices along with their platform data, and I2C devices would behave much like PNPACPI devices. (That is, both enumerate from board-specific tables.) To match the exported i2c_new_device(), the previously-private function i2c_unregister_device() is now exported. Pending later patches using these new APIs, this is effectively a NOP. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Jean Delvare <khali@linux-fr.org>
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*
|
|
* i2c-boardinfo.h - 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/i2c.h>
|
|
|
|
#include "i2c-core.h"
|
|
|
|
|
|
/* These symbols are exported ONLY FOR the i2c core.
|
|
* No other users will be supported.
|
|
*/
|
|
DEFINE_MUTEX(__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;
|
|
|
|
mutex_lock(&__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);
|
|
}
|
|
|
|
mutex_unlock(&__i2c_board_lock);
|
|
|
|
return status;
|
|
}
|