[PATCH 2/3] Add rfkill support to compal-laptop

[Mario Limonciello <mario_limonciello@xxxxxxxx>]

In order to be useful in modern kernels and standard interfaces,
compal-laptop should have rfkill support.  This patch adds it.
-- 
Mario Limonciello
*Dell | Linux Engineering*
mario_limonciello@xxxxxxxx

--- drivers/platform/x86/compal-laptop.c.old	2009-08-17 07:01:36.244874430 -0500
+++ drivers/platform/x86/compal-laptop.c	2009-08-17 07:02:15.012836625 -0500
@@ -52,6 +52,7 @@
 #include <linux/backlight.h>
 #include <linux/platform_device.h>
 #include <linux/autoconf.h>
+#include <linux/rfkill.h>
 
 #define COMPAL_DRIVER_VERSION "0.2.6"
 
@@ -64,6 +65,9 @@
 #define WLAN_MASK	0x01
 #define BT_MASK 	0x02
 
+static struct rfkill *wifi_rfkill;
+static struct rfkill *bluetooth_rfkill;
+
 static int force;
 module_param(force, bool, 0);
 MODULE_PARM_DESC(force, "Force driver load, ignore DMI data");
@@ -89,6 +93,87 @@
 	return (int) result;
 }
 
+static void compal_rfkill_query(struct rfkill *rfkill, void *data)
+{
+	unsigned long radio = (unsigned long) data;
+	u8 result;
+	bool blocked;
+
+	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
+
+	if ((result & KILLSWITCH_MASK) == 0)
+		blocked = 1;
+        else if (radio == WLAN_MASK)
+		blocked = !(result & WLAN_MASK);
+	else
+		blocked = !((result & BT_MASK) >> 1);
+
+	rfkill_set_sw_state(rfkill,blocked);
+	rfkill_set_hw_state(rfkill,0);
+}
+
+static int compal_rfkill_set(void *data, bool blocked)
+{
+	unsigned long radio = (unsigned long) data;
+	u8 result, value;
+
+	ec_read(COMPAL_EC_COMMAND_WIRELESS, &result);
+
+	if ((result & KILLSWITCH_MASK) == 0)
+		return -EINVAL;
+	else {
+		if (!blocked)
+			value = (u8) (result | radio);
+		else
+			value = (u8) (result & ~radio);
+		ec_write(COMPAL_EC_COMMAND_WIRELESS, value);
+	}
+
+	return 0;
+}
+
+static const struct rfkill_ops compal_rfkill_ops = {
+	.set_block = compal_rfkill_set,
+	.query = compal_rfkill_query,
+};
+
+static int setup_rfkill(void)
+{
+	int ret;
+
+	wifi_rfkill = rfkill_alloc("compal-wifi", NULL, RFKILL_TYPE_WLAN,
+					&compal_rfkill_ops, (void *) WLAN_MASK);
+	if (!wifi_rfkill) {
+		ret = -ENOMEM;
+		goto err_wifi;
+	}
+	ret = rfkill_register(wifi_rfkill);
+	if (ret)
+		goto err_wifi;
+
+	bluetooth_rfkill = rfkill_alloc("compal-bluetooth", NULL, RFKILL_TYPE_BLUETOOTH,
+					&compal_rfkill_ops, (void *) BT_MASK);
+	if (!bluetooth_rfkill) {
+		ret = -ENOMEM;
+		goto err_bt;
+	}
+	ret = rfkill_register(bluetooth_rfkill);
+	if (ret)
+		goto err_bt;
+
+	return 0;
+err_bt:
+	rfkill_destroy(bluetooth_rfkill);
+	if (bluetooth_rfkill)
+		rfkill_unregister(bluetooth_rfkill);
+err_wifi:
+	rfkill_destroy(wifi_rfkill);
+	if (wifi_rfkill)
+		rfkill_unregister(wifi_rfkill);
+
+	return ret;
+}
+
 static int set_wlan_state(int state)
 {
 	u8 result, value;
@@ -357,6 +442,12 @@
 	if (!force && !dmi_check_system(compal_dmi_table))
 		return -ENODEV;
 
+	ret = setup_rfkill();
+	if (ret) {
+		printk(KERN_WARNING "compal-laptop: Unable to setup rfkill\n");
+		goto fail_rfkill;
+	}
+
 	/* Register backlight stuff */
 
 	if (!acpi_video_backlight_support()) {
@@ -410,6 +501,13 @@
 
 	backlight_device_unregister(compalbl_device);
 
+fail_rfkill:
+
+	if (wifi_rfkill)
+		rfkill_unregister(wifi_rfkill);
+	if (bluetooth_rfkill)
+		rfkill_unregister(bluetooth_rfkill);
+
 	return ret;
 }
 
@@ -420,6 +518,10 @@
 	platform_device_unregister(compal_device);
 	platform_driver_unregister(&compal_driver);
 	backlight_device_unregister(compalbl_device);
+	if (wifi_rfkill)
+		rfkill_unregister(wifi_rfkill);
+	if (bluetooth_rfkill)
+		rfkill_unregister(bluetooth_rfkill);
 
 	printk(KERN_INFO "compal-laptop: driver unloaded.\n");
 }

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