[PATCH 00/12] dell-laptop: Restore rfkill functionality on some models

[PATCH 00/12] dell-laptop: Restore rfkill functionality on some models

[Hans de Goede]

Hi Matthew,

As discussed at the kernel-summit here is a resend of my dell-laptop
patch series. Patches 1-10 are unchanged from the previous patch-set,
patches 11 and 12 are new.

Please queue this up for addition to 3.14, or if there is still time for 3.13.

Thanks & Regards,

Hans

[PATCH 01/12] Revert "dell-laptop: Remove rfkill code"

[Hans de Goede]

Without rfkill functionality in dell-laptop I have the following problems:
-If the hardware radio switch is set to disable the radio, then userspace
 will still think it can use wireless and bluetooth.
-The wwan / 3g modem cannot be soft blocked without the dell-laptop rfkill
 functionality

I know the rfkill functionality was removed from the dell-laptop driver because
it caused more problems then it fixed, and the blacklist for it was growing out
of control.

But in the thread discussing this Dell mentioned that they only QA the rfkill
acpi interface on Latitudes and indeed there have been no blacklist entries
for Latitudes. Therefor I would like to bring the rfkill functionality back
only for Latitudes. This patch is a straight-forward revert. The next patch
in this set will drop the blacklist and replace it with a Latitude check.

This reverts commit a6c2390cd6d2083d27a2359658e08f2d3df375ac.

Conflicts:
	drivers/platform/x86/dell-laptop.c

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 289 +++++++++++++++++++++++++++++++++++++
 1 file changed, 289 insertions(+)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index bb77e18..55f75a2 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -21,6 +21,7 @@
 #include <linux/err.h>
 #include <linux/dmi.h>
 #include <linux/io.h>
+#include <linux/rfkill.h>
 #include <linux/power_supply.h>
 #include <linux/acpi.h>
 #include <linux/mm.h>
@@ -89,6 +90,9 @@ static struct platform_driver platform_driver = {
 
 static struct platform_device *platform_device;
 static struct backlight_device *dell_backlight_device;
+static struct rfkill *wifi_rfkill;
+static struct rfkill *bluetooth_rfkill;
+static struct rfkill *wwan_rfkill;
 
 static const struct dmi_system_id dell_device_table[] __initconst = {
 	{
@@ -115,6 +119,53 @@ static const struct dmi_system_id dell_device_table[] __initconst = {
 };
 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 
+static struct dmi_system_id dell_blacklist[] = {
+	/* Supported by compal-laptop */
+	{
+		.ident = "Dell Mini 9",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
+		},
+	},
+	{
+		.ident = "Dell Mini 10",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
+		},
+	},
+	{
+		.ident = "Dell Mini 10v",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
+		},
+	},
+	{
+		.ident = "Dell Mini 1012",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
+		},
+	},
+	{
+		.ident = "Dell Inspiron 11z",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
+		},
+	},
+	{
+		.ident = "Dell Mini 12",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
+		},
+	},
+	{}
+};
+
 static struct dmi_system_id dell_quirks[] = {
 	{
 		.callback = dmi_matched,
@@ -355,6 +406,94 @@ dell_send_request(struct calling_interface_buffer *buffer, int class,
 	return buffer;
 }
 
+/* Derived from information in DellWirelessCtl.cpp:
+   Class 17, select 11 is radio control. It returns an array of 32-bit values.
+
+   Input byte 0 = 0: Wireless information
+
+   result[0]: return code
+   result[1]:
+     Bit 0:      Hardware switch supported
+     Bit 1:      Wifi locator supported
+     Bit 2:      Wifi is supported
+     Bit 3:      Bluetooth is supported
+     Bit 4:      WWAN is supported
+     Bit 5:      Wireless keyboard supported
+     Bits 6-7:   Reserved
+     Bit 8:      Wifi is installed
+     Bit 9:      Bluetooth is installed
+     Bit 10:     WWAN is installed
+     Bits 11-15: Reserved
+     Bit 16:     Hardware switch is on
+     Bit 17:     Wifi is blocked
+     Bit 18:     Bluetooth is blocked
+     Bit 19:     WWAN is blocked
+     Bits 20-31: Reserved
+   result[2]: NVRAM size in bytes
+   result[3]: NVRAM format version number
+
+   Input byte 0 = 2: Wireless switch configuration
+   result[0]: return code
+   result[1]:
+     Bit 0:      Wifi controlled by switch
+     Bit 1:      Bluetooth controlled by switch
+     Bit 2:      WWAN controlled by switch
+     Bits 3-6:   Reserved
+     Bit 7:      Wireless switch config locked
+     Bit 8:      Wifi locator enabled
+     Bits 9-14:  Reserved
+     Bit 15:     Wifi locator setting locked
+     Bits 16-31: Reserved
+*/
+
+static int dell_rfkill_set(void *data, bool blocked)
+{
+	int disable = blocked ? 1 : 0;
+	unsigned long radio = (unsigned long)data;
+	int hwswitch_bit = (unsigned long)data - 1;
+	int ret = 0;
+
+	get_buffer();
+	dell_send_request(buffer, 17, 11);
+
+	/* If the hardware switch controls this radio, and the hardware
+	   switch is disabled, don't allow changing the software state */
+	if ((hwswitch_state & BIT(hwswitch_bit)) &&
+	    !(buffer->output[1] & BIT(16))) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	buffer->input[0] = (1 | (radio<<8) | (disable << 16));
+	dell_send_request(buffer, 17, 11);
+
+out:
+	release_buffer();
+	return ret;
+}
+
+static void dell_rfkill_query(struct rfkill *rfkill, void *data)
+{
+	int status;
+	int bit = (unsigned long)data + 16;
+	int hwswitch_bit = (unsigned long)data - 1;
+
+	get_buffer();
+	dell_send_request(buffer, 17, 11);
+	status = buffer->output[1];
+	release_buffer();
+
+	rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
+
+	if (hwswitch_state & (BIT(hwswitch_bit)))
+		rfkill_set_hw_state(rfkill, !(status & BIT(16)));
+}
+
+static const struct rfkill_ops dell_rfkill_ops = {
+	.set_block = dell_rfkill_set,
+	.query = dell_rfkill_query,
+};
+
 static struct dentry *dell_laptop_dir;
 
 static int dell_debugfs_show(struct seq_file *s, void *data)
@@ -424,6 +563,108 @@ static const struct file_operations dell_debugfs_fops = {
 	.release = single_release,
 };
 
+static void dell_update_rfkill(struct work_struct *ignored)
+{
+	if (wifi_rfkill)
+		dell_rfkill_query(wifi_rfkill, (void *)1);
+	if (bluetooth_rfkill)
+		dell_rfkill_query(bluetooth_rfkill, (void *)2);
+	if (wwan_rfkill)
+		dell_rfkill_query(wwan_rfkill, (void *)3);
+}
+static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
+
+
+static int __init dell_setup_rfkill(void)
+{
+	int status;
+	int ret;
+
+	if (dmi_check_system(dell_blacklist)) {
+		pr_info("Blacklisted hardware detected - not enabling rfkill\n");
+		return 0;
+	}
+
+	get_buffer();
+	dell_send_request(buffer, 17, 11);
+	status = buffer->output[1];
+	buffer->input[0] = 0x2;
+	dell_send_request(buffer, 17, 11);
+	hwswitch_state = buffer->output[1];
+	release_buffer();
+
+	if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
+		wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
+					   RFKILL_TYPE_WLAN,
+					   &dell_rfkill_ops, (void *) 1);
+		if (!wifi_rfkill) {
+			ret = -ENOMEM;
+			goto err_wifi;
+		}
+		ret = rfkill_register(wifi_rfkill);
+		if (ret)
+			goto err_wifi;
+	}
+
+	if ((status & (1<<3|1<<9)) == (1<<3|1<<9)) {
+		bluetooth_rfkill = rfkill_alloc("dell-bluetooth",
+						&platform_device->dev,
+						RFKILL_TYPE_BLUETOOTH,
+						&dell_rfkill_ops, (void *) 2);
+		if (!bluetooth_rfkill) {
+			ret = -ENOMEM;
+			goto err_bluetooth;
+		}
+		ret = rfkill_register(bluetooth_rfkill);
+		if (ret)
+			goto err_bluetooth;
+	}
+
+	if ((status & (1<<4|1<<10)) == (1<<4|1<<10)) {
+		wwan_rfkill = rfkill_alloc("dell-wwan",
+					   &platform_device->dev,
+					   RFKILL_TYPE_WWAN,
+					   &dell_rfkill_ops, (void *) 3);
+		if (!wwan_rfkill) {
+			ret = -ENOMEM;
+			goto err_wwan;
+		}
+		ret = rfkill_register(wwan_rfkill);
+		if (ret)
+			goto err_wwan;
+	}
+
+	return 0;
+err_wwan:
+	rfkill_destroy(wwan_rfkill);
+	if (bluetooth_rfkill)
+		rfkill_unregister(bluetooth_rfkill);
+err_bluetooth:
+	rfkill_destroy(bluetooth_rfkill);
+	if (wifi_rfkill)
+		rfkill_unregister(wifi_rfkill);
+err_wifi:
+	rfkill_destroy(wifi_rfkill);
+
+	return ret;
+}
+
+static void dell_cleanup_rfkill(void)
+{
+	if (wifi_rfkill) {
+		rfkill_unregister(wifi_rfkill);
+		rfkill_destroy(wifi_rfkill);
+	}
+	if (bluetooth_rfkill) {
+		rfkill_unregister(bluetooth_rfkill);
+		rfkill_destroy(bluetooth_rfkill);
+	}
+	if (wwan_rfkill) {
+		rfkill_unregister(wwan_rfkill);
+		rfkill_destroy(wwan_rfkill);
+	}
+}
+
 static int dell_send_intensity(struct backlight_device *bd)
 {
 	int ret = 0;
@@ -515,6 +756,30 @@ static void touchpad_led_exit(void)
 	led_classdev_unregister(&touchpad_led);
 }
 
+static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
+			      struct serio *port)
+{
+	static bool extended;
+
+	if (str & 0x20)
+		return false;
+
+	if (unlikely(data == 0xe0)) {
+		extended = true;
+		return false;
+	} else if (unlikely(extended)) {
+		switch (data) {
+		case 0x8:
+			schedule_delayed_work(&dell_rfkill_work,
+					      round_jiffies_relative(HZ));
+			break;
+		}
+		extended = false;
+	}
+
+	return false;
+}
+
 static int __init dell_init(void)
 {
 	int max_intensity = 0;
@@ -557,10 +822,26 @@ static int __init dell_init(void)
 	}
 	buffer = page_address(bufferpage);
 
+	ret = dell_setup_rfkill();
+
+	if (ret) {
+		pr_warn("Unable to setup rfkill\n");
+		goto fail_rfkill;
+	}
+
+	ret = i8042_install_filter(dell_laptop_i8042_filter);
+	if (ret) {
+		pr_warn("Unable to install key filter\n");
+		goto fail_filter;
+	}
+
 	if (quirks && quirks->touchpad_led)
 		touchpad_led_init(&platform_device->dev);
 
 	dell_laptop_dir = debugfs_create_dir("dell_laptop", NULL);
+	if (dell_laptop_dir != NULL)
+		debugfs_create_file("rfkill", 0444, dell_laptop_dir, NULL,
+				    &dell_debugfs_fops);
 
 #ifdef CONFIG_ACPI
 	/* In the event of an ACPI backlight being available, don't
@@ -603,6 +884,11 @@ static int __init dell_init(void)
 	return 0;
 
 fail_backlight:
+	i8042_remove_filter(dell_laptop_i8042_filter);
+	cancel_delayed_work_sync(&dell_rfkill_work);
+fail_filter:
+	dell_cleanup_rfkill();
+fail_rfkill:
 	free_page((unsigned long)bufferpage);
 fail_buffer:
 	platform_device_del(platform_device);
@@ -620,7 +906,10 @@ static void __exit dell_exit(void)
 	debugfs_remove_recursive(dell_laptop_dir);
 	if (quirks && quirks->touchpad_led)
 		touchpad_led_exit();
+	i8042_remove_filter(dell_laptop_i8042_filter);
+	cancel_delayed_work_sync(&dell_rfkill_work);
 	backlight_device_unregister(dell_backlight_device);
+	dell_cleanup_rfkill();
 	if (platform_device) {
 		platform_device_unregister(platform_device);
 		platform_driver_unregister(&platform_driver);
-- 
1.8.4.2

[PATCH 02/12] dell-laptop: Only enable rfkill on Latitudes

[Hans de Goede]

The rfkill functionality was removed from the dell-laptop driver because it
was causing problems on various non Latitude models, and the blacklist kept
growing and growing. In the thread discussing this Dell mentioned that they
only QA the rfkill acpi interface on Latitudes and indeed there have been
no blacklist entries for Latitudes.

Note that the blacklist contained no Vostros either, and most Vostros have
a hardware switch too, so we could consider supporting Vostros with a
hardware switch too.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 57 +++++---------------------------------
 1 file changed, 7 insertions(+), 50 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 55f75a2..bae932b 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -119,53 +119,6 @@ static const struct dmi_system_id dell_device_table[] __initconst = {
 };
 MODULE_DEVICE_TABLE(dmi, dell_device_table);
 
-static struct dmi_system_id dell_blacklist[] = {
-	/* Supported by compal-laptop */
-	{
-		.ident = "Dell Mini 9",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 910"),
-		},
-	},
-	{
-		.ident = "Dell Mini 10",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1010"),
-		},
-	},
-	{
-		.ident = "Dell Mini 10v",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1011"),
-		},
-	},
-	{
-		.ident = "Dell Mini 1012",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1012"),
-		},
-	},
-	{
-		.ident = "Dell Inspiron 11z",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1110"),
-		},
-	},
-	{
-		.ident = "Dell Mini 12",
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
-			DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 1210"),
-		},
-	},
-	{}
-};
-
 static struct dmi_system_id dell_quirks[] = {
 	{
 		.callback = dmi_matched,
@@ -579,11 +532,15 @@ static int __init dell_setup_rfkill(void)
 {
 	int status;
 	int ret;
+	const char *product;
 
-	if (dmi_check_system(dell_blacklist)) {
-		pr_info("Blacklisted hardware detected - not enabling rfkill\n");
+	/*
+	 * rfkill causes trouble on various non Latitudes, according to Dell
+	 * actually testing the rfkill functionality is only done on Latitudes.
+	 */
+	product = dmi_get_system_info(DMI_PRODUCT_NAME);
+	if (!product || strncmp(product, "Latitude", 8))
 		return 0;
-	}
 
 	get_buffer();
 	dell_send_request(buffer, 17, 11);
-- 
1.8.4.2

[PATCH 03/12] dell-laptop: If there is no hwswitch, then clear all hw-controlled bits

[Hans de Goede]

To ensure we don't enter any hw-switch related code paths on machines without
a hw-switch.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index bae932b..48fabf6 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -548,6 +548,9 @@ static int __init dell_setup_rfkill(void)
 	buffer->input[0] = 0x2;
 	dell_send_request(buffer, 17, 11);
 	hwswitch_state = buffer->output[1];
+	/* If there is no hwswitch, then clear all hw-controlled bits */
+	if (!(status & BIT(0)))
+		hwswitch_state &= ~7;
 	release_buffer();
 
 	if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
-- 
1.8.4.2

[PATCH 04/12] dell-laptop: Only get status from BIOS once when updating

[Hans de Goede]

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 28 +++++++++++++++++++---------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 48fabf6..06f281b 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -425,21 +425,24 @@ out:
 	return ret;
 }
 
+static void dell_rfkill_update(struct rfkill *rfkill, int radio, int status)
+{
+	rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
+
+	if (hwswitch_state & (BIT(radio - 1)))
+		rfkill_set_hw_state(rfkill, !(status & BIT(16)));
+}
+
 static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 {
 	int status;
-	int bit = (unsigned long)data + 16;
-	int hwswitch_bit = (unsigned long)data - 1;
 
 	get_buffer();
 	dell_send_request(buffer, 17, 11);
 	status = buffer->output[1];
 	release_buffer();
 
-	rfkill_set_sw_state(rfkill, !!(status & BIT(bit)));
-
-	if (hwswitch_state & (BIT(hwswitch_bit)))
-		rfkill_set_hw_state(rfkill, !(status & BIT(16)));
+	dell_rfkill_update(rfkill, (unsigned long)data, status);
 }
 
 static const struct rfkill_ops dell_rfkill_ops = {
@@ -518,12 +521,19 @@ static const struct file_operations dell_debugfs_fops = {
 
 static void dell_update_rfkill(struct work_struct *ignored)
 {
+	int status;
+
+	get_buffer();
+	dell_send_request(buffer, 17, 11);
+	status = buffer->output[1];
+	release_buffer();
+
 	if (wifi_rfkill)
-		dell_rfkill_query(wifi_rfkill, (void *)1);
+		dell_rfkill_update(wifi_rfkill, 1, status);
 	if (bluetooth_rfkill)
-		dell_rfkill_query(bluetooth_rfkill, (void *)2);
+		dell_rfkill_update(bluetooth_rfkill, 2, status);
 	if (wwan_rfkill)
-		dell_rfkill_query(wwan_rfkill, (void *)3);
+		dell_rfkill_update(wwan_rfkill, 3, status);
 }
 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 
-- 
1.8.4.2

[PATCH 05/12] dell-laptop: Don't set sw_state from the query callback

[Hans de Goede]

The query callback should only update the hw_state, see the comment in
net/rfkill/core.c in rfkill_set_block, which is its only caller.

rfkill_set_block will modify the sw_state directly after calling query so
calling set_sw_state is an expensive NOP.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 06f281b..7f47396 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -425,10 +425,15 @@ out:
 	return ret;
 }
 
-static void dell_rfkill_update(struct rfkill *rfkill, int radio, int status)
+static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
+					int status)
 {
 	rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
+}
 
+static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
+					int status)
+{
 	if (hwswitch_state & (BIT(radio - 1)))
 		rfkill_set_hw_state(rfkill, !(status & BIT(16)));
 }
@@ -442,7 +447,7 @@ static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 	status = buffer->output[1];
 	release_buffer();
 
-	dell_rfkill_update(rfkill, (unsigned long)data, status);
+	dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
 }
 
 static const struct rfkill_ops dell_rfkill_ops = {
@@ -528,12 +533,18 @@ static void dell_update_rfkill(struct work_struct *ignored)
 	status = buffer->output[1];
 	release_buffer();
 
-	if (wifi_rfkill)
-		dell_rfkill_update(wifi_rfkill, 1, status);
-	if (bluetooth_rfkill)
-		dell_rfkill_update(bluetooth_rfkill, 2, status);
-	if (wwan_rfkill)
-		dell_rfkill_update(wwan_rfkill, 3, status);
+	if (wifi_rfkill) {
+		dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
+		dell_rfkill_update_sw_state(wifi_rfkill, 1, status);
+	}
+	if (bluetooth_rfkill) {
+		dell_rfkill_update_hw_state(bluetooth_rfkill, 2, status);
+		dell_rfkill_update_sw_state(bluetooth_rfkill, 2, status);
+	}
+	if (wwan_rfkill) {
+		dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
+		dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
+	}
 }
 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 
-- 
1.8.4.2

[PATCH 06/12] dell-laptop: Don't read-back sw_state on machines with a hardware switch

[Hans de Goede]

On machines with a hardware switch, the blocking settings can not be changed
through a Fn + wireless-key combo, so there is no reason to read back the
blocking state from the BIOS.

Reading back is not only not necessary it is actually harmful, since on some
machines the blocking state will be cleared to all 0 after a wireless switch
toggle, even for radios not controlled by the hw-switch (yeah firmware bugs).

This causes "magic" changes to the sw_state. This is inconsistent with other
rfkill drivers which preserve the sw_state over a hw kill on / off.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 7f47396..80de0cc 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -428,7 +428,10 @@ out:
 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 					int status)
 {
-	rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
+	if (!(status & BIT(0))) {
+		/* No hw-switch, sync BIOS state to sw_state */
+		rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
+	}
 }
 
 static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
-- 
1.8.4.2

[PATCH 07/12] dell-laptop: Allow changing the sw_state while the radio is blocked by hw

[Hans de Goede]

This makes dell-laptop's rfkill code consistent with other drivers which
allow sw_state changes while hw blocked.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 80de0cc..834f499 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -404,7 +404,6 @@ static int dell_rfkill_set(void *data, bool blocked)
 	int disable = blocked ? 1 : 0;
 	unsigned long radio = (unsigned long)data;
 	int hwswitch_bit = (unsigned long)data - 1;
-	int ret = 0;
 
 	get_buffer();
 	dell_send_request(buffer, 17, 11);
@@ -412,17 +411,15 @@ static int dell_rfkill_set(void *data, bool blocked)
 	/* If the hardware switch controls this radio, and the hardware
 	   switch is disabled, don't allow changing the software state */
 	if ((hwswitch_state & BIT(hwswitch_bit)) &&
-	    !(buffer->output[1] & BIT(16))) {
-		ret = -EINVAL;
+	    !(buffer->output[1] & BIT(16)))
 		goto out;
-	}
 
 	buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 	dell_send_request(buffer, 17, 11);
 
 out:
 	release_buffer();
-	return ret;
+	return 0;
 }
 
 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
-- 
1.8.4.2

[PATCH 08/12] dell-laptop: Sync current block state to BIOS on hw switch change

[Hans de Goede]

This is necessary for 3 reasons:
1) To apply sw_state changes made while hw-blocked
2) To set all the blocked bits for hw-switch controlled radios to 1 when the
   switch gets changed to off, this is necessary on some models to actually
   turn the radio status LEDs off.
3) On some models non hw-switch controlled radios will have their block bit
   cleared (potentially undoing a soft-block) on hw-switch toggle, this
   restores the sw-block in this case.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 834f499..7f59624 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -422,10 +422,16 @@ out:
 	return 0;
 }
 
+/* Must be called with the buffer held */
 static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
 					int status)
 {
-	if (!(status & BIT(0))) {
+	if (status & BIT(0)) {
+		/* Has hw-switch, sync sw_state to BIOS */
+		int block = rfkill_blocked(rfkill);
+		buffer->input[0] = (1 | (radio << 8) | (block << 16));
+		dell_send_request(buffer, 17, 11);
+	} else {
 		/* No hw-switch, sync BIOS state to sw_state */
 		rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
 	}
@@ -445,9 +451,10 @@ static void dell_rfkill_query(struct rfkill *rfkill, void *data)
 	get_buffer();
 	dell_send_request(buffer, 17, 11);
 	status = buffer->output[1];
-	release_buffer();
 
 	dell_rfkill_update_hw_state(rfkill, (unsigned long)data, status);
+
+	release_buffer();
 }
 
 static const struct rfkill_ops dell_rfkill_ops = {
@@ -531,7 +538,6 @@ static void dell_update_rfkill(struct work_struct *ignored)
 	get_buffer();
 	dell_send_request(buffer, 17, 11);
 	status = buffer->output[1];
-	release_buffer();
 
 	if (wifi_rfkill) {
 		dell_rfkill_update_hw_state(wifi_rfkill, 1, status);
@@ -545,6 +551,8 @@ static void dell_update_rfkill(struct work_struct *ignored)
 		dell_rfkill_update_hw_state(wwan_rfkill, 3, status);
 		dell_rfkill_update_sw_state(wwan_rfkill, 3, status);
 	}
+
+	release_buffer();
 }
 static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
 
-- 
1.8.4.2

[PATCH 09/12] dell-laptop: Do not skip setting blocked bit rfkill_set while hw-blocked

[Hans de Goede]

Instead when hw-blocked always write 1 to the blocked bit for the radio in
question. This is necessary to properly set all the blocked bits for hw-switch
controlled radios to 1 after power-on and resume.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index 7f59624..b33b779 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -409,15 +409,14 @@ static int dell_rfkill_set(void *data, bool blocked)
 	dell_send_request(buffer, 17, 11);
 
 	/* If the hardware switch controls this radio, and the hardware
-	   switch is disabled, don't allow changing the software state */
+	   switch is disabled, always disable the radio */
 	if ((hwswitch_state & BIT(hwswitch_bit)) &&
 	    !(buffer->output[1] & BIT(16)))
-		goto out;
+		disable = 1;
 
 	buffer->input[0] = (1 | (radio<<8) | (disable << 16));
 	dell_send_request(buffer, 17, 11);
 
-out:
 	release_buffer();
 	return 0;
 }
-- 
1.8.4.2

[PATCH 10/12] dell-laptop: Wait less long before updating rfkill after an rfkill keypress

[Hans de Goede]

Some time is needed for the BIOS to do its work, but 250ms should be plenty.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index b33b779..fe20f67 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -759,7 +759,7 @@ static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
 		switch (data) {
 		case 0x8:
 			schedule_delayed_work(&dell_rfkill_work,
-					      round_jiffies_relative(HZ));
+					      round_jiffies_relative(HZ / 4));
 			break;
 		}
 		extended = false;
-- 
1.8.4.2

[PATCH 11/12] dell-laptop: Add a force_rfkill module parameter

[Hans de Goede]

Setting force_rfkill will cause the dell-laptop rfkill code to skip its
whitelist checks, this will allow individual users to override the whitelist,
as well as to gather info from users to improve the checks.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index fe20f67..bd67c89 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -93,6 +93,10 @@ static struct backlight_device *dell_backlight_device;
 static struct rfkill *wifi_rfkill;
 static struct rfkill *bluetooth_rfkill;
 static struct rfkill *wwan_rfkill;
+static bool force_rfkill;
+
+module_param(force_rfkill, bool, 0444);
+MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
 
 static const struct dmi_system_id dell_device_table[] __initconst = {
 	{
@@ -567,7 +571,7 @@ static int __init dell_setup_rfkill(void)
 	 * actually testing the rfkill functionality is only done on Latitudes.
 	 */
 	product = dmi_get_system_info(DMI_PRODUCT_NAME);
-	if (!product || strncmp(product, "Latitude", 8))
+	if (!force_rfkill && (!product || strncmp(product, "Latitude", 8)))
 		return 0;
 
 	get_buffer();
-- 
1.8.4.2

[PATCH 12/12] dell-laptop: Only enable rfkill functionality on laptops with a hw killswitch

[Hans de Goede]

All my testing has been on laptops with a hw killswitch, so to be on the
safe side disable rfkill functionality on models without a hw killswitch for
now. Once we gather some feedback on laptops without a hw killswitch this
decision maybe reconsidered.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/dell-laptop.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index bd67c89..c608b1d 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -580,11 +580,18 @@ static int __init dell_setup_rfkill(void)
 	buffer->input[0] = 0x2;
 	dell_send_request(buffer, 17, 11);
 	hwswitch_state = buffer->output[1];
-	/* If there is no hwswitch, then clear all hw-controlled bits */
-	if (!(status & BIT(0)))
-		hwswitch_state &= ~7;
 	release_buffer();
 
+	if (!(status & BIT(0))) {
+		if (force_rfkill) {
+			/* No hwsitch, clear all hw-controlled bits */
+			hwswitch_state &= ~7;
+		} else {
+			/* rfkill is only tested on laptops with a hwswitch */
+			return 0;
+		}
+	}
+
 	if ((status & (1<<2|1<<8)) == (1<<2|1<<8)) {
 		wifi_rfkill = rfkill_alloc("dell-wifi", &platform_device->dev,
 					   RFKILL_TYPE_WLAN,
-- 
1.8.4.2

Re: [PATCH 00/12] dell-laptop: Restore rfkill functionality on some models

[Matthew Garrett]

I've applied the set. Let's see how this goes.
-- 
Matthew Garrett <matthew.garrett@nebula.com>