1 files changed, 565 insertions, 0 deletions

diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
new file mode 100644
index 0000000000..276bf3c8a8
--- /dev/null
+++ b/drivers/media/rc/iguanair.c
@@ -0,0 +1,565 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * IguanaWorks USB IR Transceiver support
+ *
+ * Copyright (C) 2012 Sean Young <sean@mess.org>
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <linux/slab.h>
+#include <linux/completion.h>
+#include <media/rc-core.h>
+
+#define BUF_SIZE 152
+
+struct iguanair {
+	struct rc_dev *rc;
+
+	struct device *dev;
+	struct usb_device *udev;
+
+	uint16_t version;
+	uint8_t bufsize;
+	uint8_t cycle_overhead;
+
+	/* receiver support */
+	bool receiver_on;
+	dma_addr_t dma_in, dma_out;
+	uint8_t *buf_in;
+	struct urb *urb_in, *urb_out;
+	struct completion completion;
+
+	/* transmit support */
+	bool tx_overflow;
+	uint32_t carrier;
+	struct send_packet *packet;
+
+	char name[64];
+	char phys[64];
+};
+
+#define CMD_NOP			0x00
+#define CMD_GET_VERSION		0x01
+#define CMD_GET_BUFSIZE		0x11
+#define CMD_GET_FEATURES	0x10
+#define CMD_SEND		0x15
+#define CMD_EXECUTE		0x1f
+#define CMD_RX_OVERFLOW		0x31
+#define CMD_TX_OVERFLOW		0x32
+#define CMD_RECEIVER_ON		0x12
+#define CMD_RECEIVER_OFF	0x14
+
+#define DIR_IN			0xdc
+#define DIR_OUT			0xcd
+
+#define MAX_IN_PACKET		8u
+#define MAX_OUT_PACKET		(sizeof(struct send_packet) + BUF_SIZE)
+#define TIMEOUT			1000
+#define RX_RESOLUTION		21
+
+struct packet {
+	uint16_t start;
+	uint8_t direction;
+	uint8_t cmd;
+};
+
+struct send_packet {
+	struct packet header;
+	uint8_t length;
+	uint8_t channels;
+	uint8_t busy7;
+	uint8_t busy4;
+	uint8_t payload[];
+};
+
+static void process_ir_data(struct iguanair *ir, unsigned len)
+{
+	if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
+		switch (ir->buf_in[3]) {
+		case CMD_GET_VERSION:
+			if (len == 6) {
+				ir->version = (ir->buf_in[5] << 8) |
+							ir->buf_in[4];
+				complete(&ir->completion);
+			}
+			break;
+		case CMD_GET_BUFSIZE:
+			if (len >= 5) {
+				ir->bufsize = ir->buf_in[4];
+				complete(&ir->completion);
+			}
+			break;
+		case CMD_GET_FEATURES:
+			if (len > 5) {
+				ir->cycle_overhead = ir->buf_in[5];
+				complete(&ir->completion);
+			}
+			break;
+		case CMD_TX_OVERFLOW:
+			ir->tx_overflow = true;
+			fallthrough;
+		case CMD_RECEIVER_OFF:
+		case CMD_RECEIVER_ON:
+		case CMD_SEND:
+			complete(&ir->completion);
+			break;
+		case CMD_RX_OVERFLOW:
+			dev_warn(ir->dev, "receive overflow\n");
+			ir_raw_event_overflow(ir->rc);
+			break;
+		default:
+			dev_warn(ir->dev, "control code %02x received\n",
+							ir->buf_in[3]);
+			break;
+		}
+	} else if (len >= 7) {
+		struct ir_raw_event rawir = {};
+		unsigned i;
+		bool event = false;
+
+		for (i = 0; i < 7; i++) {
+			if (ir->buf_in[i] == 0x80) {
+				rawir.pulse = false;
+				rawir.duration = 21845;
+			} else {
+				rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
+				rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
+								 RX_RESOLUTION;
+			}
+
+			if (ir_raw_event_store_with_filter(ir->rc, &rawir))
+				event = true;
+		}
+
+		if (event)
+			ir_raw_event_handle(ir->rc);
+	}
+}
+
+static void iguanair_rx(struct urb *urb)
+{
+	struct iguanair *ir;
+	int rc;
+
+	if (!urb)
+		return;
+
+	ir = urb->context;
+	if (!ir)
+		return;
+
+	switch (urb->status) {
+	case 0:
+		process_ir_data(ir, urb->actual_length);
+		break;
+	case -ECONNRESET:
+	case -ENOENT:
+	case -ESHUTDOWN:
+		return;
+	case -EPIPE:
+	default:
+		dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
+		break;
+	}
+
+	rc = usb_submit_urb(urb, GFP_ATOMIC);
+	if (rc && rc != -ENODEV)
+		dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
+}
+
+static void iguanair_irq_out(struct urb *urb)
+{
+	struct iguanair *ir = urb->context;
+
+	if (urb->status)
+		dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
+
+	/* if we sent an nop packet, do not expect a response */
+	if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
+		complete(&ir->completion);
+}
+
+static int iguanair_send(struct iguanair *ir, unsigned size)
+{
+	int rc;
+
+	reinit_completion(&ir->completion);
+
+	ir->urb_out->transfer_buffer_length = size;
+	rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
+	if (rc)
+		return rc;
+
+	if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
+		return -ETIMEDOUT;
+
+	return rc;
+}
+
+static int iguanair_get_features(struct iguanair *ir)
+{
+	int rc;
+
+	/*
+	 * On cold boot, the iguanair initializes on the first packet
+	 * received but does not process that packet. Send an empty
+	 * packet.
+	 */
+	ir->packet->header.start = 0;
+	ir->packet->header.direction = DIR_OUT;
+	ir->packet->header.cmd = CMD_NOP;
+	iguanair_send(ir, sizeof(ir->packet->header));
+
+	ir->packet->header.cmd = CMD_GET_VERSION;
+	rc = iguanair_send(ir, sizeof(ir->packet->header));
+	if (rc) {
+		dev_info(ir->dev, "failed to get version\n");
+		goto out;
+	}
+
+	if (ir->version < 0x205) {
+		dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
+		rc = -ENODEV;
+		goto out;
+	}
+
+	ir->bufsize = 150;
+	ir->cycle_overhead = 65;
+
+	ir->packet->header.cmd = CMD_GET_BUFSIZE;
+
+	rc = iguanair_send(ir, sizeof(ir->packet->header));
+	if (rc) {
+		dev_info(ir->dev, "failed to get buffer size\n");
+		goto out;
+	}
+
+	if (ir->bufsize > BUF_SIZE) {
+		dev_info(ir->dev, "buffer size %u larger than expected\n",
+								ir->bufsize);
+		ir->bufsize = BUF_SIZE;
+	}
+
+	ir->packet->header.cmd = CMD_GET_FEATURES;
+
+	rc = iguanair_send(ir, sizeof(ir->packet->header));
+	if (rc)
+		dev_info(ir->dev, "failed to get features\n");
+out:
+	return rc;
+}
+
+static int iguanair_receiver(struct iguanair *ir, bool enable)
+{
+	ir->packet->header.start = 0;
+	ir->packet->header.direction = DIR_OUT;
+	ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
+
+	return iguanair_send(ir, sizeof(ir->packet->header));
+}
+
+/*
+ * The iguanair creates the carrier by busy spinning after each half period.
+ * This is counted in CPU cycles, with the CPU running at 24MHz. It is
+ * broken down into 7-cycles and 4-cyles delays, with a preference for
+ * 4-cycle delays, minus the overhead of the loop itself (cycle_overhead).
+ */
+static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
+{
+	struct iguanair *ir = dev->priv;
+
+	if (carrier < 25000 || carrier > 150000)
+		return -EINVAL;
+
+	if (carrier != ir->carrier) {
+		uint32_t cycles, fours, sevens;
+
+		ir->carrier = carrier;
+
+		cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
+							ir->cycle_overhead;
+
+		/*
+		 * Calculate minimum number of 7 cycles needed so
+		 * we are left with a multiple of 4; so we want to have
+		 * (sevens * 7) & 3 == cycles & 3
+		 */
+		sevens = (4 - cycles) & 3;
+		fours = (cycles - sevens * 7) / 4;
+
+		/*
+		 * The firmware interprets these values as a relative offset
+		 * for a branch. Immediately following the branches, there
+		 * 4 instructions of 7 cycles (2 bytes each) and 110
+		 * instructions of 4 cycles (1 byte each). A relative branch
+		 * of 0 will execute all of them, branch further for less
+		 * cycle burning.
+		 */
+		ir->packet->busy7 = (4 - sevens) * 2;
+		ir->packet->busy4 = 110 - fours;
+	}
+
+	return 0;
+}
+
+static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
+{
+	struct iguanair *ir = dev->priv;
+
+	if (mask > 15)
+		return 4;
+
+	ir->packet->channels = mask << 4;
+
+	return 0;
+}
+
+static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
+{
+	struct iguanair *ir = dev->priv;
+	unsigned int i, size, p, periods;
+	int rc;
+
+	/* convert from us to carrier periods */
+	for (i = size = 0; i < count; i++) {
+		periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
+		while (periods) {
+			p = min(periods, 127u);
+			if (size >= ir->bufsize) {
+				rc = -EINVAL;
+				goto out;
+			}
+			ir->packet->payload[size++] = p | ((i & 1) ? 0x80 : 0);
+			periods -= p;
+		}
+	}
+
+	ir->packet->header.start = 0;
+	ir->packet->header.direction = DIR_OUT;
+	ir->packet->header.cmd = CMD_SEND;
+	ir->packet->length = size;
+
+	ir->tx_overflow = false;
+
+	rc = iguanair_send(ir, sizeof(*ir->packet) + size);
+
+	if (rc == 0 && ir->tx_overflow)
+		rc = -EOVERFLOW;
+
+out:
+	return rc ? rc : count;
+}
+
+static int iguanair_open(struct rc_dev *rdev)
+{
+	struct iguanair *ir = rdev->priv;
+	int rc;
+
+	rc = iguanair_receiver(ir, true);
+	if (rc == 0)
+		ir->receiver_on = true;
+
+	return rc;
+}
+
+static void iguanair_close(struct rc_dev *rdev)
+{
+	struct iguanair *ir = rdev->priv;
+	int rc;
+
+	rc = iguanair_receiver(ir, false);
+	ir->receiver_on = false;
+	if (rc && rc != -ENODEV)
+		dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
+}
+
+static int iguanair_probe(struct usb_interface *intf,
+			  const struct usb_device_id *id)
+{
+	struct usb_device *udev = interface_to_usbdev(intf);
+	struct iguanair *ir;
+	struct rc_dev *rc;
+	int ret, pipein, pipeout;
+	struct usb_host_interface *idesc;
+
+	idesc = intf->cur_altsetting;
+	if (idesc->desc.bNumEndpoints < 2)
+		return -ENODEV;
+
+	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
+	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
+	if (!ir || !rc) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
+								&ir->dma_in);
+	ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
+								&ir->dma_out);
+	ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
+	ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
+
+	if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out ||
+	    !usb_endpoint_is_int_in(&idesc->endpoint[0].desc) ||
+	    !usb_endpoint_is_int_out(&idesc->endpoint[1].desc)) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ir->rc = rc;
+	ir->dev = &intf->dev;
+	ir->udev = udev;
+
+	init_completion(&ir->completion);
+	pipeout = usb_sndintpipe(udev,
+				idesc->endpoint[1].desc.bEndpointAddress);
+	usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
+						iguanair_irq_out, ir, 1);
+	ir->urb_out->transfer_dma = ir->dma_out;
+	ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
+	usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
+							 iguanair_rx, ir, 1);
+	ir->urb_in->transfer_dma = ir->dma_in;
+	ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+	ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
+	if (ret) {
+		dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
+		goto out;
+	}
+
+	ret = iguanair_get_features(ir);
+	if (ret)
+		goto out2;
+
+	snprintf(ir->name, sizeof(ir->name),
+		"IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
+
+	usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
+
+	rc->device_name = ir->name;
+	rc->input_phys = ir->phys;
+	usb_to_input_id(ir->udev, &rc->input_id);
+	rc->dev.parent = &intf->dev;
+	rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
+	rc->priv = ir;
+	rc->open = iguanair_open;
+	rc->close = iguanair_close;
+	rc->s_tx_mask = iguanair_set_tx_mask;
+	rc->s_tx_carrier = iguanair_set_tx_carrier;
+	rc->tx_ir = iguanair_tx;
+	rc->driver_name = KBUILD_MODNAME;
+	rc->map_name = RC_MAP_RC6_MCE;
+	rc->min_timeout = 1;
+	rc->timeout = IR_DEFAULT_TIMEOUT;
+	rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
+	rc->rx_resolution = RX_RESOLUTION;
+
+	iguanair_set_tx_carrier(rc, 38000);
+	iguanair_set_tx_mask(rc, 0);
+
+	ret = rc_register_device(rc);
+	if (ret < 0) {
+		dev_err(&intf->dev, "failed to register rc device %d", ret);
+		goto out2;
+	}
+
+	usb_set_intfdata(intf, ir);
+
+	return 0;
+out2:
+	usb_kill_urb(ir->urb_in);
+	usb_kill_urb(ir->urb_out);
+out:
+	if (ir) {
+		usb_free_urb(ir->urb_in);
+		usb_free_urb(ir->urb_out);
+		usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
+		usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
+								ir->dma_out);
+	}
+	rc_free_device(rc);
+	kfree(ir);
+	return ret;
+}
+
+static void iguanair_disconnect(struct usb_interface *intf)
+{
+	struct iguanair *ir = usb_get_intfdata(intf);
+
+	rc_unregister_device(ir->rc);
+	usb_set_intfdata(intf, NULL);
+	usb_kill_urb(ir->urb_in);
+	usb_kill_urb(ir->urb_out);
+	usb_free_urb(ir->urb_in);
+	usb_free_urb(ir->urb_out);
+	usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
+	usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
+	kfree(ir);
+}
+
+static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
+{
+	struct iguanair *ir = usb_get_intfdata(intf);
+	int rc = 0;
+
+	if (ir->receiver_on) {
+		rc = iguanair_receiver(ir, false);
+		if (rc)
+			dev_warn(ir->dev, "failed to disable receiver for suspend\n");
+	}
+
+	usb_kill_urb(ir->urb_in);
+	usb_kill_urb(ir->urb_out);
+
+	return rc;
+}
+
+static int iguanair_resume(struct usb_interface *intf)
+{
+	struct iguanair *ir = usb_get_intfdata(intf);
+	int rc;
+
+	rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
+	if (rc)
+		dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
+
+	if (ir->receiver_on) {
+		rc = iguanair_receiver(ir, true);
+		if (rc)
+			dev_warn(ir->dev, "failed to enable receiver after resume\n");
+	}
+
+	return rc;
+}
+
+static const struct usb_device_id iguanair_table[] = {
+	{ USB_DEVICE(0x1781, 0x0938) },
+	{ }
+};
+
+static struct usb_driver iguanair_driver = {
+	.name =	KBUILD_MODNAME,
+	.probe = iguanair_probe,
+	.disconnect = iguanair_disconnect,
+	.suspend = iguanair_suspend,
+	.resume = iguanair_resume,
+	.reset_resume = iguanair_resume,
+	.id_table = iguanair_table,
+	.soft_unbind = 1	/* we want to disable receiver on unbind */
+};
+
+module_usb_driver(iguanair_driver);
+
+MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
+MODULE_AUTHOR("Sean Young <sean@mess.org>");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, iguanair_table);
+