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Date: Mon, 4 Oct 2010 18:15:20 +0100 (BST)
From: Daniel Drake <dsd@...top.org>
To: mjg@...hat.com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...top.org>
---
arch/x86/include/asm/olpc.h | 2 +
drivers/platform/x86/Kconfig | 8 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/xo1-rfkill.c | 86 +++++++++++++++++++++++++++++++++++++
4 files changed, 97 insertions(+), 0 deletions(-)
create mode 100644 drivers/platform/x86/xo1-rfkill.c
diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h
index 101229b..42a978c 100644
--- a/arch/x86/include/asm/olpc.h
+++ b/arch/x86/include/asm/olpc.h
@@ -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 */
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index b49f9b1..d7e56b3 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -595,4 +595,12 @@ 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
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index b26df2e..cd87f83 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -30,4 +30,5 @@ 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
diff --git a/drivers/platform/x86/xo1-rfkill.c b/drivers/platform/x86/xo1-rfkill.c
new file mode 100644
index 0000000..c61181c
--- /dev/null
+++ b/drivers/platform/x86/xo1-rfkill.c
@@ -0,0 +1,86 @@
+/*
+ * 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;
+
+ printk(KERN_INFO "%s: loading\n", pdev->name);
+ 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@...top.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:xo1-rfkill");
+
+module_init(xo1_rfkill_init);
+module_exit(xo1_rfkill_exit);
--
1.7.2.3
--
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