Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 209 insertions, 0 deletions

diff --git a/drivers/media/rc/imon_raw.c b/drivers/media/rc/imon_raw.c
new file mode 100644
index 000000000..d41580f6e
--- /dev/null
+++ b/drivers/media/rc/imon_raw.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (C) 2018 Sean Young <sean@mess.org>
+
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <media/rc-core.h>
+
+/* Each bit is 250us */
+#define BIT_DURATION 250
+
+struct imon {
+	struct device *dev;
+	struct urb *ir_urb;
+	struct rc_dev *rcdev;
+	__be64 ir_buf;
+	char phys[64];
+};
+
+/*
+ * The first 5 bytes of data represent IR pulse or space. Each bit, starting
+ * from highest bit in the first byte, represents 250µs of data. It is 1
+ * for space and 0 for pulse.
+ *
+ * The station sends 10 packets, and the 7th byte will be number 1 to 10, so
+ * when we receive 10 we assume all the data has arrived.
+ */
+static void imon_ir_data(struct imon *imon)
+{
+	struct ir_raw_event rawir = {};
+	u64 data = be64_to_cpu(imon->ir_buf);
+	u8 packet_no = data & 0xff;
+	int offset = 40;
+	int bit;
+
+	if (packet_no == 0xff)
+		return;
+
+	dev_dbg(imon->dev, "data: %*ph", 8, &imon->ir_buf);
+
+	/*
+	 * Only the first 5 bytes contain IR data. Right shift so we move
+	 * the IR bits to the lower 40 bits.
+	 */
+	data >>= 24;
+
+	do {
+		/*
+		 * Find highest set bit which is less or equal to offset
+		 *
+		 * offset is the bit above (base 0) where we start looking.
+		 *
+		 * data & (BIT_ULL(offset) - 1) masks off any unwanted bits,
+		 * so we have just bits less than offset.
+		 *
+		 * fls will tell us the highest bit set plus 1 (or 0 if no
+		 * bits are set).
+		 */
+		rawir.pulse = !rawir.pulse;
+		bit = fls64(data & (BIT_ULL(offset) - 1));
+		if (bit < offset) {
+			dev_dbg(imon->dev, "%s: %d bits",
+				rawir.pulse ? "pulse" : "space", offset - bit);
+			rawir.duration = (offset - bit) * BIT_DURATION;
+			ir_raw_event_store_with_filter(imon->rcdev, &rawir);
+
+			offset = bit;
+		}
+
+		data = ~data;
+	} while (offset > 0);
+
+	if (packet_no == 0x0a && !imon->rcdev->idle) {
+		ir_raw_event_set_idle(imon->rcdev, true);
+		ir_raw_event_handle(imon->rcdev);
+	}
+}
+
+static void imon_ir_rx(struct urb *urb)
+{
+	struct imon *imon = urb->context;
+	int ret;
+
+	switch (urb->status) {
+	case 0:
+		imon_ir_data(imon);
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		usb_unlink_urb(urb);
+		return;
+	case -EPIPE:
+	default:
+		dev_dbg(imon->dev, "error: urb status = %d", urb->status);
+		break;
+	}
+
+	ret = usb_submit_urb(urb, GFP_ATOMIC);
+	if (ret && ret != -ENODEV)
+		dev_warn(imon->dev, "failed to resubmit urb: %d", ret);
+}
+
+static int imon_probe(struct usb_interface *intf,
+		      const struct usb_device_id *id)
+{
+	struct usb_endpoint_descriptor *ir_ep = NULL;
+	struct usb_host_interface *idesc;
+	struct usb_device *udev;
+	struct rc_dev *rcdev;
+	struct imon *imon;
+	int i, ret;
+
+	udev = interface_to_usbdev(intf);
+	idesc = intf->cur_altsetting;
+
+	for (i = 0; i < idesc->desc.bNumEndpoints; i++) {
+		struct usb_endpoint_descriptor *ep = &idesc->endpoint[i].desc;
+
+		if (usb_endpoint_is_int_in(ep)) {
+			ir_ep = ep;
+			break;
+		}
+	}
+
+	if (!ir_ep) {
+		dev_err(&intf->dev, "IR endpoint missing");
+		return -ENODEV;
+	}
+
+	imon = devm_kmalloc(&intf->dev, sizeof(*imon), GFP_KERNEL);
+	if (!imon)
+		return -ENOMEM;
+
+	imon->ir_urb = usb_alloc_urb(0, GFP_KERNEL);
+	if (!imon->ir_urb)
+		return -ENOMEM;
+
+	imon->dev = &intf->dev;
+	usb_fill_int_urb(imon->ir_urb, udev,
+			 usb_rcvintpipe(udev, ir_ep->bEndpointAddress),
+			 &imon->ir_buf, sizeof(imon->ir_buf),
+			 imon_ir_rx, imon, ir_ep->bInterval);
+
+	rcdev = devm_rc_allocate_device(&intf->dev, RC_DRIVER_IR_RAW);
+	if (!rcdev) {
+		ret = -ENOMEM;
+		goto free_urb;
+	}
+
+	usb_make_path(udev, imon->phys, sizeof(imon->phys));
+
+	rcdev->device_name = "iMON Station";
+	rcdev->driver_name = KBUILD_MODNAME;
+	rcdev->input_phys = imon->phys;
+	usb_to_input_id(udev, &rcdev->input_id);
+	rcdev->dev.parent = &intf->dev;
+	rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
+	rcdev->map_name = RC_MAP_IMON_RSC;
+	rcdev->rx_resolution = BIT_DURATION;
+	rcdev->priv = imon;
+
+	ret = devm_rc_register_device(&intf->dev, rcdev);
+	if (ret)
+		goto free_urb;
+
+	imon->rcdev = rcdev;
+
+	ret = usb_submit_urb(imon->ir_urb, GFP_KERNEL);
+	if (ret)
+		goto free_urb;
+
+	usb_set_intfdata(intf, imon);
+
+	return 0;
+
+free_urb:
+	usb_free_urb(imon->ir_urb);
+	return ret;
+}
+
+static void imon_disconnect(struct usb_interface *intf)
+{
+	struct imon *imon = usb_get_intfdata(intf);
+
+	usb_kill_urb(imon->ir_urb);
+	usb_free_urb(imon->ir_urb);
+}
+
+static const struct usb_device_id imon_table[] = {
+	/* SoundGraph iMON (IR only) -- sg_imon.inf */
+	{ USB_DEVICE(0x04e8, 0xff30) },
+	{}
+};
+
+static struct usb_driver imon_driver = {
+	.name = KBUILD_MODNAME,
+	.probe = imon_probe,
+	.disconnect = imon_disconnect,
+	.id_table = imon_table
+};
+
+module_usb_driver(imon_driver);
+
+MODULE_DESCRIPTION("Early raw iMON IR devices");
+MODULE_AUTHOR("Sean Young <sean@mess.org>");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, imon_table);