HID: sb0540: add support for Creative SB0540 IR receivers

Add a new hid driver for the Creative SB0540 IR receiver. This receiver
is usually coupled with an RM-1500 or an RM-1800 remote control.

The scrollwheels on the RM-1800 remote are not bound, as they are
labelled for specific audio controls that don't usually exist on most
systems. They can be remapped using standard Linux keyboard
remapping tools.

Signed-off-by: Bastien Nocera <bnocera@redhat.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

MAINTAINERS

@@ -4308,6 +4308,12 @@ S:	Maintained
 F:	Documentation/filesystems/cramfs.txt
 F:	fs/cramfs/
 
+CREATIVE SB0540
+M:	Bastien Nocera <hadess@hadess.net>
+L:	linux-input@vger.kernel.org
+S:	Maintained
+F:	drivers/hid/hid-creative-sb0540.c
+
 CRYPTO API
 M:	Herbert Xu <herbert@gondor.apana.org.au>
 M:	"David S. Miller" <davem@davemloft.net>

drivers/hid/Kconfig

@@ -273,6 +273,15 @@ config HID_CP2112
 	and gpiochip to expose these functions of the CP2112. The
 	customizable USB descriptor fields are exposed as sysfs attributes.
 
+config HID_CREATIVE_SB0540
+	tristate "Creative SB0540 infrared receiver"
+	depends on USB_HID
+	help
+	Support for Creative infrared SB0540-compatible remote controls, such
+	as the RM-1500 and RM-1800 remotes.
+
+	Say Y here if you want support for Creative SB0540 infrared receiver.
+
 config HID_CYPRESS
 	tristate "Cypress mouse and barcode readers"
 	depends on HID

drivers/hid/Makefile

@@ -27,6 +27,7 @@ obj-$(CONFIG_HID_ALPS)		+= hid-alps.o
 obj-$(CONFIG_HID_ACRUX)		+= hid-axff.o
 obj-$(CONFIG_HID_APPLE)		+= hid-apple.o
 obj-$(CONFIG_HID_APPLEIR)	+= hid-appleir.o
+obj-$(CONFIG_HID_CREATIVE_SB0540)	+= hid-creative-sb0540.o
 obj-$(CONFIG_HID_ASUS)		+= hid-asus.o
 obj-$(CONFIG_HID_AUREAL)	+= hid-aureal.o
 obj-$(CONFIG_HID_BELKIN)	+= hid-belkin.o

drivers/hid/hid-creative-sb0540.c

@@ -0,0 +1,268 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * HID driver for the Creative SB0540 receiver
+ *
+ * Copyright (C) 2019 Red Hat Inc. All Rights Reserved
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include "hid-ids.h"
+
+MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
+MODULE_DESCRIPTION("HID Creative SB0540 receiver");
+MODULE_LICENSE("GPL");
+
+static const unsigned short creative_sb0540_key_table[] = {
+	KEY_POWER,
+	KEY_RESERVED,		/* text: 24bit */
+	KEY_RESERVED,		/* 24bit wheel up */
+	KEY_RESERVED,		/* 24bit wheel down */
+	KEY_RESERVED,		/* text: CMSS */
+	KEY_RESERVED,		/* CMSS wheel Up */
+	KEY_RESERVED,		/* CMSS wheel Down */
+	KEY_RESERVED,		/* text: EAX */
+	KEY_RESERVED,		/* EAX wheel up */
+	KEY_RESERVED,		/* EAX wheel down */
+	KEY_RESERVED,		/* text: 3D Midi */
+	KEY_RESERVED,		/* 3D Midi wheel up */
+	KEY_RESERVED,		/* 3D Midi wheel down */
+	KEY_MUTE,
+	KEY_VOLUMEUP,
+	KEY_VOLUMEDOWN,
+	KEY_UP,
+	KEY_LEFT,
+	KEY_RIGHT,
+	KEY_REWIND,
+	KEY_OK,
+	KEY_FASTFORWARD,
+	KEY_DOWN,
+	KEY_AGAIN,		/* text: Return, symbol: Jump to */
+	KEY_PLAY,		/* text: Start */
+	KEY_ESC,		/* text: Cancel */
+	KEY_RECORD,
+	KEY_OPTION,
+	KEY_MENU,		/* text: Display */
+	KEY_PREVIOUS,
+	KEY_PLAYPAUSE,
+	KEY_NEXT,
+	KEY_SLOW,
+	KEY_STOP,
+	KEY_NUMERIC_1,
+	KEY_NUMERIC_2,
+	KEY_NUMERIC_3,
+	KEY_NUMERIC_4,
+	KEY_NUMERIC_5,
+	KEY_NUMERIC_6,
+	KEY_NUMERIC_7,
+	KEY_NUMERIC_8,
+	KEY_NUMERIC_9,
+	KEY_NUMERIC_0
+};
+
+/*
+ * Codes and keys from lirc's
+ * remotes/creative/lircd.conf.alsa_usb
+ * order and size must match creative_sb0540_key_table[] above
+ */
+static const unsigned short creative_sb0540_codes[] = {
+	0x619E,
+	0x916E,
+	0x926D,
+	0x936C,
+	0x718E,
+	0x946B,
+	0x956A,
+	0x8C73,
+	0x9669,
+	0x9768,
+	0x9867,
+	0x9966,
+	0x9A65,
+	0x6E91,
+	0x629D,
+	0x639C,
+	0x7B84,
+	0x6B94,
+	0x728D,
+	0x8778,
+	0x817E,
+	0x758A,
+	0x8D72,
+	0x8E71,
+	0x8877,
+	0x7C83,
+	0x738C,
+	0x827D,
+	0x7689,
+	0x7F80,
+	0x7986,
+	0x7A85,
+	0x7D82,
+	0x857A,
+	0x8B74,
+	0x8F70,
+	0x906F,
+	0x8A75,
+	0x847B,
+	0x7887,
+	0x8976,
+	0x837C,
+	0x7788,
+	0x807F
+};
+
+struct creative_sb0540 {
+	struct input_dev *input_dev;
+	struct hid_device *hid;
+	unsigned short keymap[ARRAY_SIZE(creative_sb0540_key_table)];
+};
+
+static inline u64 reverse(u64 data, int bits)
+{
+	int i;
+	u64 c;
+
+	c = 0;
+	for (i = 0; i < bits; i++) {
+		c |= (u64) (((data & (((u64) 1) << i)) ? 1 : 0))
+			<< (bits - 1 - i);
+	}
+	return (c);
+}
+
+static int get_key(struct creative_sb0540 *creative_sb0540, u64 keycode)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(creative_sb0540_codes); i++) {
+		if (creative_sb0540_codes[i] == keycode)
+			return creative_sb0540->keymap[i];
+	}
+
+	return 0;
+
+}
+
+static int creative_sb0540_raw_event(struct hid_device *hid,
+	struct hid_report *report, u8 *data, int len)
+{
+	struct creative_sb0540 *creative_sb0540 = hid_get_drvdata(hid);
+	u64 code, main_code;
+	int key;
+
+	if (len != 6)
+		return 0;
+
+	/* From daemons/hw_hiddev.c sb0540_rec() in lirc */
+	code = reverse(data[5], 8);
+	main_code = (code << 8) + ((~code) & 0xff);
+
+	/*
+	 * Flip to get values in the same format as
+	 * remotes/creative/lircd.conf.alsa_usb in lirc
+	 */
+	main_code = ((main_code & 0xff) << 8) +
+		((main_code & 0xff00) >> 8);
+
+	key = get_key(creative_sb0540, main_code);
+	if (key == 0 || key == KEY_RESERVED) {
+		hid_err(hid, "Could not get a key for main_code %llX\n",
+			main_code);
+		return 0;
+	}
+
+	input_report_key(creative_sb0540->input_dev, key, 1);
+	input_report_key(creative_sb0540->input_dev, key, 0);
+	input_sync(creative_sb0540->input_dev);
+
+	/* let hidraw and hiddev handle the report */
+	return 0;
+}
+
+static int creative_sb0540_input_configured(struct hid_device *hid,
+		struct hid_input *hidinput)
+{
+	struct input_dev *input_dev = hidinput->input;
+	struct creative_sb0540 *creative_sb0540 = hid_get_drvdata(hid);
+	int i;
+
+	creative_sb0540->input_dev = input_dev;
+
+	input_dev->keycode = creative_sb0540->keymap;
+	input_dev->keycodesize = sizeof(unsigned short);
+	input_dev->keycodemax = ARRAY_SIZE(creative_sb0540->keymap);
+
+	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
+
+	memcpy(creative_sb0540->keymap, creative_sb0540_key_table,
+		sizeof(creative_sb0540->keymap));
+	for (i = 0; i < ARRAY_SIZE(creative_sb0540_key_table); i++)
+		set_bit(creative_sb0540->keymap[i], input_dev->keybit);
+	clear_bit(KEY_RESERVED, input_dev->keybit);
+
+	return 0;
+}
+
+static int creative_sb0540_input_mapping(struct hid_device *hid,
+		struct hid_input *hi, struct hid_field *field,
+		struct hid_usage *usage, unsigned long **bit, int *max)
+{
+	/*
+	 * We are remapping the keys ourselves, so ignore the hid-input
+	 * keymap processing.
+	 */
+	return -1;
+}
+
+static int creative_sb0540_probe(struct hid_device *hid,
+		const struct hid_device_id *id)
+{
+	int ret;
+	struct creative_sb0540 *creative_sb0540;
+
+	creative_sb0540 = devm_kzalloc(&hid->dev,
+		sizeof(struct creative_sb0540), GFP_KERNEL);
+
+	if (!creative_sb0540)
+		return -ENOMEM;
+
+	creative_sb0540->hid = hid;
+
+	/* force input as some remotes bypass the input registration */
+	hid->quirks |= HID_QUIRK_HIDINPUT_FORCE;
+
+	hid_set_drvdata(hid, creative_sb0540);
+
+	ret = hid_parse(hid);
+	if (ret) {
+		hid_err(hid, "parse failed\n");
+		return ret;
+	}
+
+	ret = hid_hw_start(hid, HID_CONNECT_DEFAULT);
+	if (ret) {
+		hid_err(hid, "hw start failed\n");
+		return ret;
+	}
+
+	return ret;
+}
+
+static const struct hid_device_id creative_sb0540_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_CREATIVELABS, USB_DEVICE_ID_CREATIVE_SB0540) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, creative_sb0540_devices);
+
+static struct hid_driver creative_sb0540_driver = {
+	.name = "creative-sb0540",
+	.id_table = creative_sb0540_devices,
+	.raw_event = creative_sb0540_raw_event,
+	.input_configured = creative_sb0540_input_configured,
+	.probe = creative_sb0540_probe,
+	.input_mapping = creative_sb0540_input_mapping,
+};
+module_hid_driver(creative_sb0540_driver);

drivers/hid/hid-ids.h

@@ -314,6 +314,7 @@
 #define USB_VENDOR_ID_CREATIVELABS	0x041e
 #define USB_DEVICE_ID_CREATIVE_SB_OMNI_SURROUND_51	0x322c
 #define USB_DEVICE_ID_PRODIKEYS_PCMIDI	0x2801
+#define USB_DEVICE_ID_CREATIVE_SB0540	0x3100
 
 #define USB_VENDOR_ID_CVTOUCH		0x1ff7
 #define USB_DEVICE_ID_CVTOUCH_SCREEN	0x0013