Re: [PATCH 1/1] media: dvb-usb/af9015, fix disconnection crashes

[Jiri Slaby]

On 01/26/2010 02:08 PM, Jiri Kosina wrote:
>> In my understanding the cause of the remote problem is chipset bug which sets
>> USB2.0 polling interval to 4096ms. Therefore HID remote does not work at all
>> or starts repeating. It is possible to implement remote as polling from the
>> driver which works very well. But HID problem still remains. I have some hacks
>> in my mind to test to kill HID. One is to configure HID wrongly to see if it
>> stops outputting characters. Other way is try to read remote codes directly
>> from the chip memory.
> 
> Yes, Pekka Sarnila has added this workaround to the HID driver, as the 
> device is apparently broken.
> 
> I want to better understand why others are not hitting this with the 
> DVB remote driver before removing the quirk from HID code completely.

I think, we should go for a better way. Thanks Pekka for hints, I ended
up with the patch in the attachment. Could you try it whether it works
for you?

I have 2 dvb-t receivers and both of them need fullspeed quirk. Further
disable_rc_polling (a dvb_usb module parameter) must be set to not get
doubled characters now. And then, it works like a charm.

Note that, it's just some kind of proof of concept. A migration of
af9015 devices from dvb-usb-remote needs to be done first.

Ideas, comments?

regards,
-- 
js
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 139668d..0daf90a 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -122,6 +122,13 @@ config DRAGONRISE_FF
 	Say Y here if you want to enable force feedback support for DragonRise Inc.
 	game controllers.
 
+config HID_DVB
+	tristate "DVB remotes support" if EMBEDDED
+	depends on USB_HID
+	default !EMBEDDED
+	---help---
+	Say Y here if you have DVB remote controllers.
+
 config HID_EZKEY
 	tristate "Ezkey" if EMBEDDED
 	depends on USB_HID
diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile
index b62d4b3..a336b2a 100644
--- a/drivers/hid/Makefile
+++ b/drivers/hid/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_HID_CHERRY)	+= hid-cherry.o
 obj-$(CONFIG_HID_CHICONY)	+= hid-chicony.o
 obj-$(CONFIG_HID_CYPRESS)	+= hid-cypress.o
 obj-$(CONFIG_HID_DRAGONRISE)	+= hid-drff.o
+obj-$(CONFIG_HID_DVB)		+= hid-dvb.o
 obj-$(CONFIG_HID_EZKEY)		+= hid-ezkey.o
 obj-$(CONFIG_HID_GYRATION)	+= hid-gyration.o
 obj-$(CONFIG_HID_KENSINGTON)	+= hid-kensington.o
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 2dd9b28..678c553 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1252,6 +1252,7 @@ static const struct hid_device_id hid_blacklist[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_3M, USB_DEVICE_ID_3M1968) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_AFATECH, USB_DEVICE_ID_AFATECH_AF9016) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_ATV_IRCONTROL) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_IRCONTROL4) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_APPLE, USB_DEVICE_ID_APPLE_MIGHTYMOUSE) },
@@ -1310,6 +1311,7 @@ static const struct hid_device_id hid_blacklist[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_KENSINGTON, USB_DEVICE_ID_KS_SLIMBLADE) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_KYE, USB_DEVICE_ID_KYE_ERGO_525V) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LABTEC, USB_DEVICE_ID_LABTEC_WIRELESS_KEYBOARD) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_LEADTEK, USB_DEVICE_ID_DTV_GOLD) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER_2) },
diff --git a/drivers/hid/hid-dvb.c b/drivers/hid/hid-dvb.c
new file mode 100644
index 0000000..ee94c07
--- /dev/null
+++ b/drivers/hid/hid-dvb.c
@@ -0,0 +1,78 @@
+/*
+ *  HID driver for dvb devices
+ *
+ *  Copyright (c) 2010 Jiri Slaby
+ *
+ *  Licensed under the GPLv2.
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+
+#include "hid-ids.h"
+
+#define FULLSPEED_INTERVAL	0x1
+
+static int dvb_event(struct hid_device *hdev, struct hid_field *field,
+		struct hid_usage *usage, __s32 value)
+{
+	/* we won't get a "key up" event */
+	if (value) {
+		input_event(field->hidinput->input, usage->type, usage->code, 1);
+		input_event(field->hidinput->input, usage->type, usage->code, 0);
+	}
+	return 1;
+}
+
+static int dvb_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	unsigned long quirks = id->driver_data;
+	int ret;
+
+	if (quirks & FULLSPEED_INTERVAL)
+		hdev->quirks |= HID_QUIRK_FULLSPEED_INTERVAL;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		dev_err(&hdev->dev, "parse failed\n");
+		goto end;
+	}
+
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (ret)
+		dev_err(&hdev->dev, "hw start failed\n");
+end:
+	return ret;
+}
+
+static const struct hid_device_id dvb_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_AFATECH, USB_DEVICE_ID_AFATECH_AF9016),
+		.driver_data = FULLSPEED_INTERVAL },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_LEADTEK, USB_DEVICE_ID_DTV_GOLD),
+		.driver_data = FULLSPEED_INTERVAL },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(hid, dvb_devices);
+
+static struct hid_driver dvb_driver = {
+	.name = "dvb",
+	.id_table = dvb_devices,
+	.probe = dvb_probe,
+	.event = dvb_event,
+};
+
+static int __init dvb_init(void)
+{
+	return hid_register_driver(&dvb_driver);
+}
+
+static void __exit dvb_exit(void)
+{
+	hid_unregister_driver(&dvb_driver);
+}
+
+module_init(dvb_init);
+module_exit(dvb_exit);
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 39ff98a..7a6495f 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -18,6 +18,9 @@
 #ifndef HID_IDS_H_FILE
 #define HID_IDS_H_FILE
 
+#define USB_VENDOR_ID_LEADTEK		0x0413
+#define USB_DEVICE_ID_DTV_GOLD		0x6029
+
 #define USB_VENDOR_ID_3M		0x0596
 #define USB_DEVICE_ID_3M1968		0x0500
 
diff --git a/drivers/hid/usbhid/hid-quirks.c b/drivers/hid/usbhid/hid-quirks.c
index 88a1c69..74aac20 100644
--- a/drivers/hid/usbhid/hid-quirks.c
+++ b/drivers/hid/usbhid/hid-quirks.c
@@ -41,8 +41,6 @@ static const struct hid_blacklist {
 	{ USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_RUMBLEPAD, HID_QUIRK_BADPAD },
 	{ USB_VENDOR_ID_TOPMAX, USB_DEVICE_ID_TOPMAX_COBRAPAD, HID_QUIRK_BADPAD },
 
-	{ USB_VENDOR_ID_AFATECH, USB_DEVICE_ID_AFATECH_AF9016, HID_QUIRK_FULLSPEED_INTERVAL },
-
 	{ USB_VENDOR_ID_ETURBOTOUCH, USB_DEVICE_ID_ETURBOTOUCH, HID_QUIRK_MULTI_INPUT },
 	{ USB_VENDOR_ID_PANTHERLORD, USB_DEVICE_ID_PANTHERLORD_TWIN_USB_JOYSTICK, HID_QUIRK_MULTI_INPUT | HID_QUIRK_SKIP_OUTPUT_REPORTS },
 	{ USB_VENDOR_ID_PLAYDOTCOM, USB_DEVICE_ID_PLAYDOTCOM_EMS_USBII, HID_QUIRK_MULTI_INPUT },
diff --git a/drivers/media/dvb/dvb-usb/af9015.c b/drivers/media/dvb/dvb-usb/af9015.c
index 650c913..239c2d0 100644
--- a/drivers/media/dvb/dvb-usb/af9015.c
+++ b/drivers/media/dvb/dvb-usb/af9015.c
@@ -1613,7 +1613,10 @@ static int af9015_usb_probe(struct usb_interface *intf,
 
 	/* interface 0 is used by DVB-T receiver and
 	   interface 1 is for remote controller (HID) */
-	if (intf->cur_altsetting->desc.bInterfaceNumber == 0) {
+	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)
+		return -ENODEV;
+
+	{
 		ret = af9015_read_config(udev);
 		if (ret)
 			return ret;