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Add OLPC XO-1 rfkill driver 

Add a software rfkill switch for the WLAN interface in the OLPC XO-1
laptop. It uses the OLPC embedded controller to cut/restore power to
the Marvell WLAN chip on the motherboard.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Daniel Drake 2010-10-05 15:55:21 +01:00 committed by Matthew Garrett
parent bd9fc3a723
commit 260586d2b4
4 changed files with 96 additions and 0 deletions
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2
arch/x86/include/asm/olpc.h
View File

@ -89,6 +89,8 @@ extern int olpc_ec_mask_unset(uint8_t bits);
/* EC commands */
#define EC_FIRMWARE_REV 0x08
#define EC_WLAN_ENTER_RESET 0x35
#define EC_WLAN_LEAVE_RESET 0x25
/* SCI source values */

8
drivers/platform/x86/Kconfig
View File

@ -615,4 +615,12 @@ config INTEL_IPS
functionality. If in doubt, say Y here; it will only load on
supported platforms.
config XO1_RFKILL
tristate "OLPC XO-1 software RF kill switch"
depends on OLPC
depends on RFKILL
---help---
Support for enabling/disabling the WLAN interface on the OLPC XO-1
laptop.
endif # X86_PLATFORM_DEVICES

1
drivers/platform/x86/Makefile
View File

@ -31,4 +31,5 @@ obj-$(CONFIG_INTEL_SCU_IPC) += intel_scu_ipc.o
obj-$(CONFIG_RAR_REGISTER) += intel_rar_register.o
obj-$(CONFIG_INTEL_IPS) += intel_ips.o
obj-$(CONFIG_GPIO_INTEL_PMIC) += intel_pmic_gpio.o
obj-$(CONFIG_XO1_RFKILL) += xo1-rfkill.o

85
drivers/platform/x86/xo1-rfkill.c Normal file
View File

@ -0,0 +1,85 @@
/*
* Support for rfkill through the OLPC XO-1 laptop embedded controller
*
* Copyright (C) 2010 One Laptop per Child
*
* 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.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/rfkill.h>
#include <asm/olpc.h>
static int rfkill_set_block(void *data, bool blocked)
{
unsigned char cmd;
if (blocked)
cmd = EC_WLAN_ENTER_RESET;
else
cmd = EC_WLAN_LEAVE_RESET;
return olpc_ec_cmd(cmd, NULL, 0, NULL, 0);
}
static const struct rfkill_ops rfkill_ops = {
.set_block = rfkill_set_block,
};
static int __devinit xo1_rfkill_probe(struct platform_device *pdev)
{
struct rfkill *rfk;
int r;
rfk = rfkill_alloc(pdev->name, &pdev->dev, RFKILL_TYPE_WLAN,
&rfkill_ops, NULL);
if (!rfk)
return -ENOMEM;
r = rfkill_register(rfk);
if (r) {
rfkill_destroy(rfk);
return r;
}
platform_set_drvdata(pdev, rfk);
return 0;
}
static int __devexit xo1_rfkill_remove(struct platform_device *pdev)
{
struct rfkill *rfk = platform_get_drvdata(pdev);
rfkill_unregister(rfk);
rfkill_destroy(rfk);
return 0;
}
static struct platform_driver xo1_rfkill_driver = {
.driver = {
.name = "xo1-rfkill",
.owner = THIS_MODULE,
},
.probe = xo1_rfkill_probe,
.remove = __devexit_p(xo1_rfkill_remove),
};
static int __init xo1_rfkill_init(void)
{
return platform_driver_register(&xo1_rfkill_driver);
}
static void __exit xo1_rfkill_exit(void)
{
platform_driver_unregister(&xo1_rfkill_driver);
}
MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:xo1-rfkill");
module_init(xo1_rfkill_init);
module_exit(xo1_rfkill_exit);