--- /dev/null
+/*
+ * TechnoTrend USB IR Receiver
+ *
+ * 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/module.h>
+#include <linux/usb.h>
+#include <linux/usb/input.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <media/rc-core.h>
+
+#define DRIVER_NAME "ttusbir"
+#define DRIVER_DESC "TechnoTrend USB IR Receiver"
+/*
+ * The Windows driver uses 8 URBS, the original lirc drivers has a
+ * configurable amount (2 default, 4 max). This device generates about 125
+ * messages per second (!), whether IR is idle or not.
+ */
+#define NUM_URBS 4
+#define NS_PER_BYTE 62500
+#define NS_PER_BIT (NS_PER_BYTE/8)
+
+struct ttusbir {
+ struct rc_dev *rc;
+ struct device *dev;
+ struct usb_device *udev;
+
+ struct urb *urb[NUM_URBS];
+
+ struct led_classdev led;
+ struct urb *bulk_urb;
+ uint8_t bulk_buffer[5];
+ int bulk_out_endp, iso_in_endp;
+ bool led_on, is_led_on;
+ atomic_t led_complete;
+
+ char phys[64];
+};
+
+static enum led_brightness ttusbir_brightness_get(struct led_classdev *led_dev)
+{
+ struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
+
+ return tt->led_on ? LED_FULL : LED_OFF;
+}
+
+static void ttusbir_set_led(struct ttusbir *tt)
+{
+ int ret;
+
+ smp_mb();
+
+ if (tt->led_on != tt->is_led_on && tt->udev &&
+ atomic_add_unless(&tt->led_complete, 1, 1)) {
+ tt->bulk_buffer[4] = tt->is_led_on = tt->led_on;
+ ret = usb_submit_urb(tt->bulk_urb, GFP_ATOMIC);
+ if (ret) {
+ dev_warn(tt->dev, "failed to submit bulk urb: %d\n",
+ ret);
+ atomic_dec(&tt->led_complete);
+ }
+ }
+}
+
+static void ttusbir_brightness_set(struct led_classdev *led_dev, enum
+ led_brightness brightness)
+{
+ struct ttusbir *tt = container_of(led_dev, struct ttusbir, led);
+
+ tt->led_on = brightness != LED_OFF;
+
+ ttusbir_set_led(tt);
+}
+
+/*
+ * The urb cannot be reused until the urb completes
+ */
+static void ttusbir_bulk_complete(struct urb *urb)
+{
+ struct ttusbir *tt = urb->context;
+
+ atomic_dec(&tt->led_complete);
+
+ switch (urb->status) {
+ case 0:
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ usb_unlink_urb(urb);
+ return;
+ case -EPIPE:
+ default:
+ dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
+ break;
+ }
+
+ ttusbir_set_led(tt);
+}
+
+/*
+ * The data is one bit per sample, a set bit signifying silence and samples
+ * being MSB first. Bit 0 can contain garbage so take it to be whatever
+ * bit 1 is, so we don't have unexpected edges.
+ */
+static void ttusbir_process_ir_data(struct ttusbir *tt, uint8_t *buf)
+{
+ struct ir_raw_event rawir;
+ unsigned i, v, b;
+ bool event = false;
+
+ init_ir_raw_event(&rawir);
+
+ for (i = 0; i < 128; i++) {
+ v = buf[i] & 0xfe;
+ switch (v) {
+ case 0xfe:
+ rawir.pulse = false;
+ rawir.duration = NS_PER_BYTE;
+ if (ir_raw_event_store_with_filter(tt->rc, &rawir))
+ event = true;
+ break;
+ case 0:
+ rawir.pulse = true;
+ rawir.duration = NS_PER_BYTE;
+ if (ir_raw_event_store_with_filter(tt->rc, &rawir))
+ event = true;
+ break;
+ default:
+ /* one edge per byte */
+ if (v & 2) {
+ b = ffz(v | 1);
+ rawir.pulse = true;
+ } else {
+ b = ffs(v) - 1;
+ rawir.pulse = false;
+ }
+
+ rawir.duration = NS_PER_BIT * (8 - b);
+ if (ir_raw_event_store_with_filter(tt->rc, &rawir))
+ event = true;
+
+ rawir.pulse = !rawir.pulse;
+ rawir.duration = NS_PER_BIT * b;
+ if (ir_raw_event_store_with_filter(tt->rc, &rawir))
+ event = true;
+ break;
+ }
+ }
+
+ /* don't wakeup when there's nothing to do */
+ if (event)
+ ir_raw_event_handle(tt->rc);
+}
+
+static void ttusbir_urb_complete(struct urb *urb)
+{
+ struct ttusbir *tt = urb->context;
+ int rc;
+
+ switch (urb->status) {
+ case 0:
+ ttusbir_process_ir_data(tt, urb->transfer_buffer);
+ break;
+ case -ECONNRESET:
+ case -ENOENT:
+ case -ESHUTDOWN:
+ usb_unlink_urb(urb);
+ return;
+ case -EPIPE:
+ default:
+ dev_dbg(tt->dev, "Error: urb status = %d\n", urb->status);
+ break;
+ }
+
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (rc && rc != -ENODEV)
+ dev_warn(tt->dev, "failed to resubmit urb: %d\n", rc);
+}
+
+static int ttusbir_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct ttusbir *tt;
+ struct usb_interface_descriptor *idesc;
+ struct usb_endpoint_descriptor *desc;
+ struct rc_dev *rc;
+ int i, j, ret;
+ int altsetting = -1;
+
+ tt = kzalloc(sizeof(*tt), GFP_KERNEL);
+ rc = rc_allocate_device();
+ if (!tt || !rc) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ /* find the correct alt setting */
+ for (i = 0; i < intf->num_altsetting && altsetting == -1; i++) {
+ int max_packet, bulk_out_endp = -1, iso_in_endp = -1;
+
+ idesc = &intf->altsetting[i].desc;
+
+ for (j = 0; j < idesc->bNumEndpoints; j++) {
+ desc = &intf->altsetting[i].endpoint[j].desc;
+ max_packet = le16_to_cpu(desc->wMaxPacketSize);
+ if (usb_endpoint_dir_in(desc) &&
+ usb_endpoint_xfer_isoc(desc) &&
+ max_packet == 0x10)
+ iso_in_endp = j;
+ else if (usb_endpoint_dir_out(desc) &&
+ usb_endpoint_xfer_bulk(desc) &&
+ max_packet == 0x20)
+ bulk_out_endp = j;
+
+ if (bulk_out_endp != -1 && iso_in_endp != -1) {
+ tt->bulk_out_endp = bulk_out_endp;
+ tt->iso_in_endp = iso_in_endp;
+ altsetting = i;
+ break;
+ }
+ }
+ }
+
+ if (altsetting == -1) {
+ dev_err(&intf->dev, "cannot find expected altsetting\n");
+ ret = -ENODEV;
+ goto out;
+ }
+
+ tt->dev = &intf->dev;
+ tt->udev = interface_to_usbdev(intf);
+ tt->rc = rc;
+
+ ret = usb_set_interface(tt->udev, 0, altsetting);
+ if (ret)
+ goto out;
+
+ for (i = 0; i < NUM_URBS; i++) {
+ struct urb *urb = usb_alloc_urb(8, GFP_KERNEL);
+ void *buffer;
+
+ if (!urb) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ urb->dev = tt->udev;
+ urb->context = tt;
+ urb->pipe = usb_rcvisocpipe(tt->udev, tt->iso_in_endp);
+ urb->interval = 1;
+ buffer = usb_alloc_coherent(tt->udev, 128, GFP_KERNEL,
+ &urb->transfer_dma);
+ if (!buffer) {
+ usb_free_urb(urb);
+ ret = -ENOMEM;
+ goto out;
+ }
+ urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP | URB_ISO_ASAP;
+ urb->transfer_buffer = buffer;
+ urb->complete = ttusbir_urb_complete;
+ urb->number_of_packets = 8;
+ urb->transfer_buffer_length = 128;
+
+ for (j = 0; j < 8; j++) {
+ urb->iso_frame_desc[j].offset = j * 16;
+ urb->iso_frame_desc[j].length = 16;
+ }
+
+ tt->urb[i] = urb;
+ }
+
+ tt->bulk_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!tt->bulk_urb) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ tt->bulk_buffer[0] = 0xaa;
+ tt->bulk_buffer[1] = 0x01;
+ tt->bulk_buffer[2] = 0x05;
+ tt->bulk_buffer[3] = 0x01;
+
+ usb_fill_bulk_urb(tt->bulk_urb, tt->udev, usb_sndbulkpipe(tt->udev,
+ tt->bulk_out_endp), tt->bulk_buffer, sizeof(tt->bulk_buffer),
+ ttusbir_bulk_complete, tt);
+
+ tt->led.name = "ttusbir:green:power";
+ tt->led.default_trigger = "rc-feedback";
+ tt->led.brightness_set = ttusbir_brightness_set;
+ tt->led.brightness_get = ttusbir_brightness_get;
+ tt->is_led_on = tt->led_on = true;
+ atomic_set(&tt->led_complete, 0);
+ ret = led_classdev_register(&intf->dev, &tt->led);
+ if (ret)
+ goto out;
+
+ usb_make_path(tt->udev, tt->phys, sizeof(tt->phys));
+
+ rc->input_name = DRIVER_DESC;
+ rc->input_phys = tt->phys;
+ usb_to_input_id(tt->udev, &rc->input_id);
+ rc->dev.parent = &intf->dev;
+ rc->driver_type = RC_DRIVER_IR_RAW;
+ rc->allowed_protocols = RC_BIT_ALL;
+ rc->priv = tt;
+ rc->driver_name = DRIVER_NAME;
+ rc->map_name = RC_MAP_TT_1500;
+ rc->timeout = MS_TO_NS(100);
+ /*
+ * The precision is NS_PER_BIT, but since every 8th bit can be
+ * overwritten with garbage the accuracy is at best 2 * NS_PER_BIT.
+ */
+ rc->rx_resolution = NS_PER_BIT;
+
+ ret = rc_register_device(rc);
+ if (ret) {
+ dev_err(&intf->dev, "failed to register rc device %d\n", ret);
+ goto out2;
+ }
+
+ usb_set_intfdata(intf, tt);
+
+ for (i = 0; i < NUM_URBS; i++) {
+ ret = usb_submit_urb(tt->urb[i], GFP_KERNEL);
+ if (ret) {
+ dev_err(tt->dev, "failed to submit urb %d\n", ret);
+ goto out3;
+ }
+ }
+
+ return 0;
+out3:
+ rc_unregister_device(rc);
+ rc = NULL;
+out2:
+ led_classdev_unregister(&tt->led);
+out:
+ if (tt) {
+ for (i = 0; i < NUM_URBS && tt->urb[i]; i++) {
+ struct urb *urb = tt->urb[i];
+
+ usb_kill_urb(urb);
+ usb_free_coherent(tt->udev, 128, urb->transfer_buffer,
+ urb->transfer_dma);
+ usb_free_urb(urb);
+ }
+ usb_kill_urb(tt->bulk_urb);
+ usb_free_urb(tt->bulk_urb);
+ kfree(tt);
+ }
+ rc_free_device(rc);
+
+ return ret;
+}
+
+static void ttusbir_disconnect(struct usb_interface *intf)
+{
+ struct ttusbir *tt = usb_get_intfdata(intf);
+ struct usb_device *udev = tt->udev;
+ int i;
+
+ tt->udev = NULL;
+
+ rc_unregister_device(tt->rc);
+ led_classdev_unregister(&tt->led);
+ for (i = 0; i < NUM_URBS; i++) {
+ usb_kill_urb(tt->urb[i]);
+ usb_free_coherent(udev, 128, tt->urb[i]->transfer_buffer,
+ tt->urb[i]->transfer_dma);
+ usb_free_urb(tt->urb[i]);
+ }
+ usb_kill_urb(tt->bulk_urb);
+ usb_free_urb(tt->bulk_urb);
+ usb_set_intfdata(intf, NULL);
+ kfree(tt);
+}
+
+static int ttusbir_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct ttusbir *tt = usb_get_intfdata(intf);
+ int i;
+
+ for (i = 0; i < NUM_URBS; i++)
+ usb_kill_urb(tt->urb[i]);
+
+ led_classdev_suspend(&tt->led);
+ usb_kill_urb(tt->bulk_urb);
+
+ return 0;
+}
+
+static int ttusbir_resume(struct usb_interface *intf)
+{
+ struct ttusbir *tt = usb_get_intfdata(intf);
+ int i, rc;
+
+ tt->is_led_on = true;
+ led_classdev_resume(&tt->led);
+
+ for (i = 0; i < NUM_URBS; i++) {
+ rc = usb_submit_urb(tt->urb[i], GFP_KERNEL);
+ if (rc) {
+ dev_warn(tt->dev, "failed to submit urb: %d\n", rc);
+ break;
+ }
+ }
+
+ return rc;
+}
+
+static const struct usb_device_id ttusbir_table[] = {
+ { USB_DEVICE(0x0b48, 0x2003) },
+ { }
+};
+
+static struct usb_driver ttusbir_driver = {
+ .name = DRIVER_NAME,
+ .id_table = ttusbir_table,
+ .probe = ttusbir_probe,
+ .suspend = ttusbir_suspend,
+ .resume = ttusbir_resume,
+ .reset_resume = ttusbir_resume,
+ .disconnect = ttusbir_disconnect,
+};
+
+module_usb_driver(ttusbir_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Sean Young <sean@mess.org>");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(usb, ttusbir_table);
+
Code Review / kvmfornfv.git / blobdiff