Date:	Sun, 15 Jun 2014 21:39:50 +0100
From:	Jamie Lentin <jm@...tin.co.uk>
To:	Jiri Kosina <jkosina@...e.cz>, Antonio Ospite <ao2@....it>
Cc:	Alexander Clouter <alex@...riz.org.uk>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jamie Lentin <jm@...tin.co.uk>
Subject: [PATCH v3 2/2] Add support for Compact (Bluetooth|USB) keyboard with Trackpoint

Signed-off-by: Jamie Lentin <jm@...tin.co.uk>
---
 drivers/hid/Kconfig      |   2 +
 drivers/hid/hid-core.c   |   2 +
 drivers/hid/hid-ids.h    |   2 +
 drivers/hid/hid-lenovo.c | 202 +++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/hid.h      |   1 +
 5 files changed, 209 insertions(+)

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index dd07d59..48b4777 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -334,6 +334,8 @@ config HID_LENOVO
 	Thinkpad standalone keyboards, e.g:
 	- ThinkPad USB Keyboard with TrackPoint (supports extra LEDs and trackpoint
 	  configuration)
+	- ThinkPad Compact Bluetooth Keyboard with TrackPoint (supports Fn keys)
+	- ThinkPad Compact USB Keyboard with TrackPoint (supports Fn keys)
 
 config HID_LOGITECH
 	tristate "Logitech devices" if EXPERT
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index e8ce932..bce37c3 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1738,6 +1738,8 @@ static const struct hid_device_id hid_have_special_driver[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LCPOWER, USB_DEVICE_ID_LCPOWER_LC1000 ) },
 #if IS_ENABLED(CONFIG_HID_LENOVO)
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_TPKBD) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_CUSBKBD) },
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_CBTKBD) },
 #endif
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_MX3000_RECEIVER) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LOGITECH, USB_DEVICE_ID_S510_RECEIVER) },
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 6e12cd0..1763a07 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -551,6 +551,8 @@
 
 #define USB_VENDOR_ID_LENOVO		0x17ef
 #define USB_DEVICE_ID_LENOVO_TPKBD	0x6009
+#define USB_DEVICE_ID_LENOVO_CUSBKBD	0x6047
+#define USB_DEVICE_ID_LENOVO_CBTKBD		0x6048
 
 #define USB_VENDOR_ID_LG		0x1fd2
 #define USB_DEVICE_ID_LG_MULTITOUCH	0x0064
diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c
index aabf084..0a19f84 100644
--- a/drivers/hid/hid-lenovo.c
+++ b/drivers/hid/hid-lenovo.c
@@ -1,8 +1,11 @@
 /*
  *  HID driver for Lenovo:-
  *  - ThinkPad USB Keyboard with TrackPoint (tpkbd)
+ *  - ThinkPad Compact Bluetooth Keyboard with TrackPoint (cptkbd)
+ *  - ThinkPad Compact USB Keyboard with TrackPoint (cptkbd)
  *
  *  Copyright (c) 2012 Bernhard Seibold
+ *  Copyright (c) 2014 Jamie Lentin <jm@...tin.co.uk>
  */
 
 /*
@@ -33,6 +36,10 @@ struct lenovo_drvdata_tpkbd {
 	int press_speed;
 };
 
+struct lenovo_drvdata_cptkbd {
+	unsigned int fn_lock;
+};
+
 #define map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
 
 static int lenovo_input_mapping_tpkbd(struct hid_device *hdev,
@@ -48,6 +55,49 @@ static int lenovo_input_mapping_tpkbd(struct hid_device *hdev,
 	return 0;
 }
 
+static int lenovo_input_mapping_cptkbd(struct hid_device *hdev,
+		struct hid_input *hi, struct hid_field *field,
+		struct hid_usage *usage, unsigned long **bit, int *max)
+{
+	/* HID_UP_LNVENDOR = USB, HID_UP_MSVENDOR = BT */
+	if ((usage->hid & HID_USAGE_PAGE) == HID_UP_MSVENDOR ||
+	    (usage->hid & HID_USAGE_PAGE) == HID_UP_LNVENDOR) {
+		set_bit(EV_REP, hi->input->evbit);
+		switch (usage->hid & HID_USAGE) {
+		case 0x00f1: /* Fn-F4: Mic mute */
+			map_key_clear(KEY_MICMUTE);
+			return 1;
+		case 0x00f2: /* Fn-F5: Brightness down */
+			map_key_clear(KEY_BRIGHTNESSDOWN);
+			return 1;
+		case 0x00f3: /* Fn-F6: Brightness up */
+			map_key_clear(KEY_BRIGHTNESSUP);
+			return 1;
+		case 0x00f4: /* Fn-F7: External display (projector) */
+			map_key_clear(KEY_SWITCHVIDEOMODE);
+			return 1;
+		case 0x00f5: /* Fn-F8: Wireless */
+			map_key_clear(KEY_WLAN);
+			return 1;
+		case 0x00f6: /* Fn-F9: Control panel */
+			map_key_clear(KEY_CONFIG);
+			return 1;
+		case 0x00f8: /* Fn-F11: View open applications (3 boxes) */
+			map_key_clear(KEY_FN_F11);
+			return 1;
+		case 0x00fa: /* Fn-Esc: Fn-lock toggle */
+			map_key_clear(KEY_FN_ESC);
+			return 1;
+		case 0x00fb: /* Fn-F12: Open My computer (6 boxes) USB-only */
+			/* NB: This mapping is invented in raw_event below */
+			map_key_clear(KEY_FILE);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
 static int lenovo_input_mapping(struct hid_device *hdev,
 		struct hid_input *hi, struct hid_field *field,
 		struct hid_usage *usage, unsigned long **bit, int *max)
@@ -57,6 +107,11 @@ static int lenovo_input_mapping(struct hid_device *hdev,
 		return lenovo_input_mapping_tpkbd(hdev, hi, field,
 							usage, bit, max);
 		break;
+	case USB_DEVICE_ID_LENOVO_CUSBKBD:
+	case USB_DEVICE_ID_LENOVO_CBTKBD:
+		return lenovo_input_mapping_cptkbd(hdev, hi, field,
+							usage, bit, max);
+		break;
 	}
 
 	return 0;
@@ -64,6 +119,96 @@ static int lenovo_input_mapping(struct hid_device *hdev,
 
 #undef map_key_clear
 
+/* Send a config command to the keyboard */
+static int lenovo_send_cmd_cptkbd(struct hid_device *hdev,
+			unsigned char byte2, unsigned char byte3)
+{
+	int ret;
+	unsigned char buf[] = {0x18, byte2, byte3};
+	unsigned char report_type = HID_OUTPUT_REPORT;
+
+	/* The USB keyboard accepts commands via SET_FEATURE */
+	if (hdev->product == USB_DEVICE_ID_LENOVO_CUSBKBD) {
+		buf[0] = 0x13;
+		report_type = HID_FEATURE_REPORT;
+	}
+
+	ret = hdev->hid_output_raw_report(hdev, buf, sizeof(buf), report_type);
+	return ret < 0 ? ret : 0; /* BT returns 0, USB returns sizeof(buf) */
+}
+
+static void lenovo_features_set_cptkbd(struct hid_device *hdev)
+{
+	struct lenovo_drvdata_cptkbd *tpcsc = hid_get_drvdata(hdev);
+
+	if (lenovo_send_cmd_cptkbd(hdev, 0x05, tpcsc->fn_lock ? 0x01 : 0x00))
+		hid_err(hdev, "Fn-lock setting failed\n");
+}
+
+static ssize_t attr_fn_lock_show_cptkbd(struct device *dev,
+		struct device_attribute *attr,
+		char *buf)
+{
+	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+	struct lenovo_drvdata_cptkbd *tpcsc = hid_get_drvdata(hdev);
+
+	return snprintf(buf, PAGE_SIZE, "%u\n", tpcsc->fn_lock);
+}
+
+static ssize_t attr_fn_lock_store_cptkbd(struct device *dev,
+		struct device_attribute *attr,
+		const char *buf,
+		size_t count)
+{
+	struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+	struct lenovo_drvdata_cptkbd *tpcsc = hid_get_drvdata(hdev);
+	int value;
+
+	if (kstrtoint(buf, 10, &value))
+		return -EINVAL;
+	if (value < 0 || value > 1)
+		return -EINVAL;
+
+	tpcsc->fn_lock = value;
+	lenovo_features_set_cptkbd(hdev);
+
+	return count;
+}
+
+static struct device_attribute dev_attr_fn_lock_cptkbd =
+	__ATTR(fn_lock, S_IWUSR | S_IRUGO,
+			attr_fn_lock_show_cptkbd,
+			attr_fn_lock_store_cptkbd);
+
+static struct attribute *lenovo_attributes_cptkbd[] = {
+	&dev_attr_fn_lock_cptkbd.attr,
+	NULL
+};
+
+static const struct attribute_group lenovo_attr_group_cptkbd = {
+	.attrs = lenovo_attributes_cptkbd,
+};
+
+static int lenovo_raw_event(struct hid_device *hdev,
+			struct hid_report *report, u8 *data, int size)
+{
+	/*
+	 * Compact USB keyboard's Fn-F12 report holds down many other keys, and
+	 * it's own key is outside the usage page range. Remove extra
+	 * keypresses and remap to inside usage page.
+	 */
+	if (unlikely(hdev->product == USB_DEVICE_ID_LENOVO_CUSBKBD
+			&& size == 3
+			&& data[0] == 0x15
+			&& data[1] == 0x94
+			&& data[2] == 0x01)) {
+		data[1] = 0x0;
+		data[2] = 0x4;
+	}
+
+	return 0;
+}
+
 static int lenovo_features_set_tpkbd(struct hid_device *hdev)
 {
 	struct hid_report *report;
@@ -417,6 +562,46 @@ static int lenovo_probe_tpkbd(struct hid_device *hdev,
 	return 0;
 }
 
+static int lenovo_probe_cptkbd(struct hid_device *hdev,
+			const struct hid_device_id *id)
+{
+	int ret;
+	struct lenovo_drvdata_cptkbd *tpcsc;
+
+	tpcsc = devm_kzalloc(&hdev->dev, sizeof(*tpcsc), GFP_KERNEL);
+	if (tpcsc == NULL) {
+		hid_err(hdev, "can't alloc keyboard descriptor\n");
+		return -ENOMEM;
+	}
+	hid_set_drvdata(hdev, tpcsc);
+
+	/* All the custom action happens on the mouse device for USB */
+	if (hdev->product == USB_DEVICE_ID_LENOVO_CUSBKBD
+			&& hdev->type != HID_TYPE_USBMOUSE) {
+		pr_debug("Ignoring keyboard half of device\n");
+		return 0;
+	}
+
+	/*
+	 * Tell the keyboard a driver understands it, and turn F7, F9, F11 into
+	 * regular keys
+	 */
+	ret = lenovo_send_cmd_cptkbd(hdev, 0x01, 0x03);
+	if (ret)
+		hid_warn(hdev, "Failed to switch F7/9/11 into regular keys\n");
+
+	/* Turn Fn-Lock on by default */
+	tpcsc->fn_lock = 1;
+	lenovo_features_set_cptkbd(hdev);
+
+	if (sysfs_create_group(&hdev->dev.kobj,
+				&lenovo_attr_group_cptkbd)) {
+		hid_warn(hdev, "Could not create sysfs group\n");
+	}
+
+	return 0;
+}
+
 static int lenovo_probe(struct hid_device *hdev,
 		const struct hid_device_id *id)
 {
@@ -438,6 +623,10 @@ static int lenovo_probe(struct hid_device *hdev,
 	case USB_DEVICE_ID_LENOVO_TPKBD:
 		ret = lenovo_probe_tpkbd(hdev, id);
 		break;
+	case USB_DEVICE_ID_LENOVO_CUSBKBD:
+	case USB_DEVICE_ID_LENOVO_CBTKBD:
+		ret = lenovo_probe_cptkbd(hdev, id);
+		break;
 	}
 	if (ret)
 		goto err_hid;
@@ -465,12 +654,22 @@ static void lenovo_remove_tpkbd(struct hid_device *hdev)
 	hid_set_drvdata(hdev, NULL);
 }
 
+static void lenovo_remove_cptkbd(struct hid_device *hdev)
+{
+	sysfs_remove_group(&hdev->dev.kobj,
+			&lenovo_attr_group_cptkbd);
+}
+
 static void lenovo_remove(struct hid_device *hdev)
 {
 	switch (hdev->product) {
 	case USB_DEVICE_ID_LENOVO_TPKBD:
 		lenovo_remove_tpkbd(hdev);
 		break;
+	case USB_DEVICE_ID_LENOVO_CUSBKBD:
+	case USB_DEVICE_ID_LENOVO_CBTKBD:
+		lenovo_remove_cptkbd(hdev);
+		break;
 	}
 
 	hid_hw_stop(hdev);
@@ -478,6 +677,8 @@ static void lenovo_remove(struct hid_device *hdev)
 
 static const struct hid_device_id lenovo_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_TPKBD) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_CUSBKBD) },
+	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_CBTKBD) },
 	{ }
 };
 
@@ -489,6 +690,7 @@ static struct hid_driver lenovo_driver = {
 	.input_mapping = lenovo_input_mapping,
 	.probe = lenovo_probe,
 	.remove = lenovo_remove,
+	.raw_event = lenovo_raw_event,
 };
 module_hid_driver(lenovo_driver);
 
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 31b9d29..ed23d6a 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -167,6 +167,7 @@ struct hid_item {
 #define HID_UP_MSVENDOR		0xff000000
 #define HID_UP_CUSTOM		0x00ff0000
 #define HID_UP_LOGIVENDOR	0xffbc0000
+#define HID_UP_LNVENDOR		0xffa00000
 #define HID_UP_SENSOR		0x00200000
 
 #define HID_USAGE		0x0000ffff
-- 
2.0.0.rc2

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