v4.19.13 snapshot.
diff --git a/drivers/media/rc/iguanair.c b/drivers/media/rc/iguanair.c
new file mode 100644
index 0000000..7daac8b
--- /dev/null
+++ b/drivers/media/rc/iguanair.c
@@ -0,0 +1,613 @@
+/*
+ * IguanaWorks USB IR Transceiver support
+ *
+ * Copyright (C) 2012 Sean Young <sean@mess.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#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 DRIVER_NAME "iguanair"
+#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;
+
+ struct mutex lock;
+
+ /* 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 21333
+
+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[0];
+};
+
+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;
+ /* fall through */
+ 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_reset(ir->rc);
+ break;
+ default:
+ dev_warn(ir->dev, "control code %02x received\n",
+ ir->buf_in[3]);
+ break;
+ }
+ } else if (len >= 7) {
+ DEFINE_IR_RAW_EVENT(rawir);
+ unsigned i;
+ bool event = false;
+
+ init_ir_raw_event(&rawir);
+
+ for (i = 0; i < 7; i++) {
+ if (ir->buf_in[i] == 0x80) {
+ rawir.pulse = false;
+ rawir.duration = US_TO_NS(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) {
+ usb_unlink_urb(urb);
+ return;
+ }
+
+ switch (urb->status) {
+ case 0:
+ process_ir_data(ir, urb->actual_length);
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ usb_unlink_urb(urb);
+ 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;
+
+ if (enable)
+ ir_raw_event_reset(ir->rc);
+
+ 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;
+
+ mutex_lock(&ir->lock);
+
+ 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;
+ }
+
+ mutex_unlock(&ir->lock);
+
+ 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;
+
+ mutex_lock(&ir->lock);
+ ir->packet->channels = mask << 4;
+ mutex_unlock(&ir->lock);
+
+ 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;
+
+ mutex_lock(&ir->lock);
+
+ /* 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:
+ mutex_unlock(&ir->lock);
+
+ return rc ? rc : count;
+}
+
+static int iguanair_open(struct rc_dev *rdev)
+{
+ struct iguanair *ir = rdev->priv;
+ int rc;
+
+ mutex_lock(&ir->lock);
+
+ rc = iguanair_receiver(ir, true);
+ if (rc == 0)
+ ir->receiver_on = true;
+
+ mutex_unlock(&ir->lock);
+
+ return rc;
+}
+
+static void iguanair_close(struct rc_dev *rdev)
+{
+ struct iguanair *ir = rdev->priv;
+ int rc;
+
+ mutex_lock(&ir->lock);
+
+ rc = iguanair_receiver(ir, false);
+ ir->receiver_on = false;
+ if (rc && rc != -ENODEV)
+ dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
+
+ mutex_unlock(&ir->lock);
+}
+
+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;
+
+ 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) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ idesc = intf->altsetting;
+
+ if (idesc->desc.bNumEndpoints < 2) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ ir->rc = rc;
+ ir->dev = &intf->dev;
+ ir->udev = udev;
+ mutex_init(&ir->lock);
+
+ 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 = DRIVER_NAME;
+ 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;
+
+ mutex_lock(&ir->lock);
+
+ 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);
+
+ mutex_unlock(&ir->lock);
+
+ return rc;
+}
+
+static int iguanair_resume(struct usb_interface *intf)
+{
+ struct iguanair *ir = usb_get_intfdata(intf);
+ int rc = 0;
+
+ mutex_lock(&ir->lock);
+
+ 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");
+ }
+
+ mutex_unlock(&ir->lock);
+
+ return rc;
+}
+
+static const struct usb_device_id iguanair_table[] = {
+ { USB_DEVICE(0x1781, 0x0938) },
+ { }
+};
+
+static struct usb_driver iguanair_driver = {
+ .name = DRIVER_NAME,
+ .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);
+