--- /dev/null
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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"
+
+struct iguanair {
+ struct rc_dev *rc;
+
+ struct device *dev;
+ struct usb_device *udev;
+
+ int pipe_in, pipe_out;
+ uint8_t bufsize;
+ uint8_t version[2];
+
+ struct mutex lock;
+
+ /* receiver support */
+ bool receiver_on;
+ dma_addr_t dma_in;
+ uint8_t *buf_in;
+ struct urb *urb_in;
+ struct completion completion;
+
+ /* transmit support */
+ bool tx_overflow;
+ uint32_t carrier;
+ uint8_t cycle_overhead;
+ uint8_t channels;
+ uint8_t busy4;
+ uint8_t busy7;
+
+ char name[64];
+ char phys[64];
+};
+
+#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_PACKET_SIZE 8u
+#define TIMEOUT 1000
+
+struct packet {
+ uint16_t start;
+ uint8_t direction;
+ uint8_t cmd;
+};
+
+struct response_packet {
+ struct packet header;
+ uint8_t data[4];
+};
+
+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_TX_OVERFLOW:
+ ir->tx_overflow = true;
+ 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");
+ 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;
+
+ 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) *
+ 21330;
+ }
+
+ ir_raw_event_store_with_filter(ir->rc, &rawir);
+ }
+
+ ir_raw_event_handle(ir->rc);
+ }
+}
+
+static void iguanair_rx(struct urb *urb)
+{
+ struct iguanair *ir;
+
+ 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;
+ }
+
+ usb_submit_urb(urb, GFP_ATOMIC);
+}
+
+static int iguanair_send(struct iguanair *ir, void *data, unsigned size,
+ struct response_packet *response, unsigned *res_len)
+{
+ unsigned offset, len;
+ int rc, transferred;
+
+ for (offset = 0; offset < size; offset += MAX_PACKET_SIZE) {
+ len = min(size - offset, MAX_PACKET_SIZE);
+
+ if (ir->tx_overflow)
+ return -EOVERFLOW;
+
+ rc = usb_interrupt_msg(ir->udev, ir->pipe_out, data + offset,
+ len, &transferred, TIMEOUT);
+ if (rc)
+ return rc;
+
+ if (transferred != len)
+ return -EIO;
+ }
+
+ if (response) {
+ rc = usb_interrupt_msg(ir->udev, ir->pipe_in, response,
+ sizeof(*response), res_len, TIMEOUT);
+ }
+
+ return rc;
+}
+
+static int iguanair_get_features(struct iguanair *ir)
+{
+ struct packet packet;
+ struct response_packet response;
+ int rc, len;
+
+ packet.start = 0;
+ packet.direction = DIR_OUT;
+ packet.cmd = CMD_GET_VERSION;
+
+ rc = iguanair_send(ir, &packet, sizeof(packet), &response, &len);
+ if (rc) {
+ dev_info(ir->dev, "failed to get version\n");
+ goto out;
+ }
+
+ if (len != 6) {
+ dev_info(ir->dev, "failed to get version\n");
+ rc = -EIO;
+ goto out;
+ }
+
+ ir->version[0] = response.data[0];
+ ir->version[1] = response.data[1];
+ ir->bufsize = 150;
+ ir->cycle_overhead = 65;
+
+ packet.cmd = CMD_GET_BUFSIZE;
+
+ rc = iguanair_send(ir, &packet, sizeof(packet), &response, &len);
+ if (rc) {
+ dev_info(ir->dev, "failed to get buffer size\n");
+ goto out;
+ }
+
+ if (len != 5) {
+ dev_info(ir->dev, "failed to get buffer size\n");
+ rc = -EIO;
+ goto out;
+ }
+
+ ir->bufsize = response.data[0];
+
+ if (ir->version[0] == 0 || ir->version[1] == 0)
+ goto out;
+
+ packet.cmd = CMD_GET_FEATURES;
+
+ rc = iguanair_send(ir, &packet, sizeof(packet), &response, &len);
+ if (rc) {
+ dev_info(ir->dev, "failed to get features\n");
+ goto out;
+ }
+
+ if (len < 5) {
+ dev_info(ir->dev, "failed to get features\n");
+ rc = -EIO;
+ goto out;
+ }
+
+ if (len > 5 && ir->version[0] >= 4)
+ ir->cycle_overhead = response.data[1];
+
+out:
+ return rc;
+}
+
+static int iguanair_receiver(struct iguanair *ir, bool enable)
+{
+ struct packet packet = { 0, DIR_OUT, enable ?
+ CMD_RECEIVER_ON : CMD_RECEIVER_OFF };
+ int rc;
+
+ INIT_COMPLETION(ir->completion);
+
+ rc = iguanair_send(ir, &packet, sizeof(packet), NULL, NULL);
+ if (rc)
+ return rc;
+
+ wait_for_completion_timeout(&ir->completion, TIMEOUT);
+
+ return 0;
+}
+
+/*
+ * The iguana ir creates the carrier by busy spinning after each pulse or
+ * space. 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.
+ */
+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;
+
+ /* make up the the remainer of 4-cycle blocks */
+ switch (cycles & 3) {
+ case 0:
+ sevens = 0;
+ break;
+ case 1:
+ sevens = 3;
+ break;
+ case 2:
+ sevens = 2;
+ break;
+ case 3:
+ sevens = 1;
+ break;
+ }
+
+ fours = (cycles - sevens * 7) / 4;
+
+ /* magic happens here */
+ ir->busy7 = (4 - sevens) * 2;
+ ir->busy4 = 110 - fours;
+ }
+
+ mutex_unlock(&ir->lock);
+
+ return carrier;
+}
+
+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->channels = mask;
+ mutex_unlock(&ir->lock);
+
+ return 0;
+}
+
+static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
+{
+ struct iguanair *ir = dev->priv;
+ uint8_t space, *payload;
+ unsigned i, size, rc;
+ struct send_packet *packet;
+
+ mutex_lock(&ir->lock);
+
+ /* convert from us to carrier periods */
+ for (i = size = 0; i < count; i++) {
+ txbuf[i] = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
+ size += (txbuf[i] + 126) / 127;
+ }
+
+ packet = kmalloc(sizeof(*packet) + size, GFP_KERNEL);
+ if (!packet) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ if (size > ir->bufsize) {
+ rc = -E2BIG;
+ goto out;
+ }
+
+ packet->header.start = 0;
+ packet->header.direction = DIR_OUT;
+ packet->header.cmd = CMD_SEND;
+ packet->length = size;
+ packet->channels = ir->channels << 4;
+ packet->busy7 = ir->busy7;
+ packet->busy4 = ir->busy4;
+
+ space = 0;
+ payload = packet->payload;
+
+ for (i = 0; i < count; i++) {
+ unsigned periods = txbuf[i];
+
+ while (periods > 127) {
+ *payload++ = 127 | space;
+ periods -= 127;
+ }
+
+ *payload++ = periods | space;
+ space ^= 0x80;
+ }
+
+ if (ir->receiver_on) {
+ rc = iguanair_receiver(ir, false);
+ if (rc) {
+ dev_warn(ir->dev, "disable receiver before transmit failed\n");
+ goto out;
+ }
+ }
+
+ ir->tx_overflow = false;
+
+ INIT_COMPLETION(ir->completion);
+
+ rc = iguanair_send(ir, packet, size + 8, NULL, NULL);
+
+ if (rc == 0) {
+ wait_for_completion_timeout(&ir->completion, TIMEOUT);
+ if (ir->tx_overflow)
+ rc = -EOVERFLOW;
+ }
+
+ ir->tx_overflow = false;
+
+ if (ir->receiver_on) {
+ if (iguanair_receiver(ir, true))
+ dev_warn(ir->dev, "re-enable receiver after transmit failed\n");
+ }
+
+out:
+ mutex_unlock(&ir->lock);
+ kfree(packet);
+
+ return rc;
+}
+
+static int iguanair_open(struct rc_dev *rdev)
+{
+ struct iguanair *ir = rdev->priv;
+ int rc;
+
+ mutex_lock(&ir->lock);
+
+ usb_submit_urb(ir->urb_in, GFP_KERNEL);
+
+ BUG_ON(ir->receiver_on);
+
+ 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)
+ dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
+
+ usb_kill_urb(ir->urb_in);
+
+ mutex_unlock(&ir->lock);
+}
+
+static int __devinit 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;
+ struct usb_host_interface *idesc;
+
+ ir = kzalloc(sizeof(*ir), GFP_KERNEL);
+ rc = rc_allocate_device();
+ if (!ir || !rc) {
+ ret = ENOMEM;
+ goto out;
+ }
+
+ ir->buf_in = usb_alloc_coherent(udev, MAX_PACKET_SIZE, GFP_ATOMIC,
+ &ir->dma_in);
+ ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
+
+ if (!ir->buf_in || !ir->urb_in) {
+ 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;
+ ir->pipe_in = usb_rcvintpipe(udev,
+ idesc->endpoint[0].desc.bEndpointAddress);
+ ir->pipe_out = usb_sndintpipe(udev,
+ idesc->endpoint[1].desc.bEndpointAddress);
+ mutex_init(&ir->lock);
+ init_completion(&ir->completion);
+
+ ret = iguanair_get_features(ir);
+ if (ret) {
+ dev_warn(&intf->dev, "failed to get device features");
+ goto out;
+ }
+
+ usb_fill_int_urb(ir->urb_in, ir->udev, ir->pipe_in, ir->buf_in,
+ MAX_PACKET_SIZE, iguanair_rx, ir,
+ idesc->endpoint[0].desc.bInterval);
+ ir->urb_in->transfer_dma = ir->dma_in;
+ ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+
+ snprintf(ir->name, sizeof(ir->name),
+ "IguanaWorks USB IR Transceiver version %d.%d",
+ ir->version[0], ir->version[1]);
+
+ usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
+
+ rc->input_name = ir->name;
+ rc->input_phys = ir->phys;
+ usb_to_input_id(ir->udev, &rc->input_id);
+ rc->dev.parent = &intf->dev;
+ rc->driver_type = RC_DRIVER_IR_RAW;
+ rc->allowed_protos = RC_TYPE_ALL;
+ 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_EMPTY;
+
+ iguanair_set_tx_carrier(rc, 38000);
+
+ ret = rc_register_device(rc);
+ if (ret < 0) {
+ dev_err(&intf->dev, "failed to register rc device %d", ret);
+ goto out;
+ }
+
+ usb_set_intfdata(intf, ir);
+
+ dev_info(&intf->dev, "Registered %s", ir->name);
+
+ return 0;
+out:
+ if (ir) {
+ usb_free_urb(ir->urb_in);
+ usb_free_coherent(udev, MAX_PACKET_SIZE, ir->buf_in,
+ ir->dma_in);
+ }
+ rc_free_device(rc);
+ kfree(ir);
+ return ret;
+}
+
+static void __devexit iguanair_disconnect(struct usb_interface *intf)
+{
+ struct iguanair *ir = usb_get_intfdata(intf);
+
+ usb_set_intfdata(intf, NULL);
+
+ usb_kill_urb(ir->urb_in);
+ usb_free_urb(ir->urb_in);
+ usb_free_coherent(ir->udev, MAX_PACKET_SIZE, ir->buf_in, ir->dma_in);
+ rc_unregister_device(ir->rc);
+ 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");
+ }
+
+ 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);
+
+ 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 = __devexit_p(iguanair_disconnect),
+ .suspend = iguanair_suspend,
+ .resume = iguanair_resume,
+ .reset_resume = iguanair_resume,
+ .id_table = iguanair_table
+};
+
+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);
+
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff