| /* |
| * lirc_ttusbir.c |
| * |
| * lirc_ttusbir - LIRC device driver for the TechnoTrend USB IR Receiver |
| * |
| * Copyright (C) 2007 Stefan Macher <st_maker-lirc@yahoo.de> |
| * |
| * This LIRC driver provides access to the TechnoTrend USB IR Receiver. |
| * The receiver delivers the IR signal as raw sampled true/false data in |
| * isochronous USB packets each of size 128 byte. |
| * Currently the driver reduces the sampling rate by factor of 8 as this |
| * is still more than enough to decode RC-5 - others should be analyzed. |
| * But the driver does not rely on RC-5 it should be able to decode every |
| * IR signal that is not too fast. |
| */ |
| |
| /* |
| * 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/version.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| #include <linux/usb.h> |
| |
| #include <media/lirc.h> |
| #include <media/lirc_dev.h> |
| |
| MODULE_DESCRIPTION("TechnoTrend USB IR device driver for LIRC"); |
| MODULE_AUTHOR("Stefan Macher (st_maker-lirc@yahoo.de)"); |
| MODULE_LICENSE("GPL"); |
| |
| /* #define DEBUG */ |
| #ifdef DEBUG |
| #define DPRINTK printk |
| #else |
| #define DPRINTK(_x_, a...) |
| #endif |
| |
| /* function declarations */ |
| static int probe(struct usb_interface *intf, const struct usb_device_id *id); |
| static void disconnect(struct usb_interface *intf); |
| static void urb_complete(struct urb *urb); |
| static int set_use_inc(void *data); |
| static void set_use_dec(void *data); |
| |
| static int num_urbs = 2; |
| module_param(num_urbs, int, S_IRUGO); |
| MODULE_PARM_DESC(num_urbs, |
| "Number of URBs in queue. Try to increase to 4 in case " |
| "of problems (default: 2; minimum: 2)"); |
| |
| /* table of devices that work with this driver */ |
| static struct usb_device_id device_id_table[] = { |
| /* TechnoTrend USB IR Receiver */ |
| { USB_DEVICE(0x0B48, 0x2003) }, |
| /* Terminating entry */ |
| { } |
| }; |
| MODULE_DEVICE_TABLE(usb, device_id_table); |
| |
| /* USB driver definition */ |
| static struct usb_driver usb_driver = { |
| .name = "TTUSBIR", |
| .id_table = &(device_id_table[0]), |
| .probe = probe, |
| .disconnect = disconnect, |
| }; |
| |
| /* USB device definition */ |
| struct ttusbir_device { |
| struct usb_driver *usb_driver; |
| struct usb_device *udev; |
| struct usb_interface *interf; |
| struct usb_class_driver class_driver; |
| unsigned int ifnum; /* Interface number to use */ |
| unsigned int alt_setting; /* alternate setting to use */ |
| unsigned int endpoint; /* Endpoint to use */ |
| struct urb **urb; /* num_urb URB pointers*/ |
| char **buffer; /* 128 byte buffer for each URB */ |
| struct lirc_buffer rbuf; /* Buffer towards LIRC */ |
| struct lirc_driver driver; |
| int minor; |
| int last_pulse; /* remembers if last received byte was pulse or space */ |
| int last_num; /* remembers how many last bytes appeared */ |
| int opened; |
| }; |
| |
| /*** LIRC specific functions ***/ |
| static int set_use_inc(void *data) |
| { |
| int i, retval; |
| struct ttusbir_device *ttusbir = data; |
| |
| DPRINTK("Sending first URBs\n"); |
| /* @TODO Do I need to check if I am already opened */ |
| ttusbir->opened = 1; |
| |
| for (i = 0; i < num_urbs; i++) { |
| retval = usb_submit_urb(ttusbir->urb[i], GFP_KERNEL); |
| if (retval) { |
| err("%s: usb_submit_urb failed on urb %d", |
| __func__, i); |
| return retval; |
| } |
| } |
| return 0; |
| } |
| |
| static void set_use_dec(void *data) |
| { |
| struct ttusbir_device *ttusbir = data; |
| |
| DPRINTK("Device closed\n"); |
| |
| ttusbir->opened = 0; |
| } |
| |
| /*** USB specific functions ***/ |
| |
| /* |
| * This mapping table is used to do a very simple filtering of the |
| * input signal. |
| * For a value with at least 4 bits set it returns 0xFF otherwise |
| * 0x00. For faster IR signals this can not be used. But for RC-5 we |
| * still have about 14 samples per pulse/space, i.e. we sample with 14 |
| * times higher frequency than the signal frequency |
| */ |
| const unsigned char map_table[] = { |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
| 0x00, 0x00, 0x00, 0xFF, 0x00, 0xFF, 0xFF, 0xFF, |
| 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
| 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF |
| }; |
| |
| static void urb_complete(struct urb *urb) |
| { |
| struct ttusbir_device *ttusbir; |
| unsigned char *buf; |
| int i; |
| int l; |
| |
| ttusbir = urb->context; |
| |
| if (!ttusbir->opened) |
| return; |
| |
| buf = (unsigned char *)urb->transfer_buffer; |
| |
| for (i = 0; i < 128; i++) { |
| /* Here we do the filtering and some kind of down sampling */ |
| buf[i] = ~map_table[buf[i]]; |
| if (ttusbir->last_pulse == buf[i]) { |
| if (ttusbir->last_num < PULSE_MASK/63) |
| ttusbir->last_num++; |
| /* |
| * else we are in a idle period and do not need to |
| * increment any longer |
| */ |
| } else { |
| l = ttusbir->last_num * 62; /* about 62 = us/byte */ |
| if (ttusbir->last_pulse) /* pulse or space? */ |
| l |= PULSE_BIT; |
| if (!lirc_buffer_full(&ttusbir->rbuf)) { |
| lirc_buffer_write(&ttusbir->rbuf, (void *)&l); |
| wake_up_interruptible(&ttusbir->rbuf.wait_poll); |
| } |
| ttusbir->last_num = 0; |
| ttusbir->last_pulse = buf[i]; |
| } |
| } |
| usb_submit_urb(urb, GFP_ATOMIC); /* keep data rolling :-) */ |
| } |
| |
| /* |
| * Called whenever the USB subsystem thinks we could be the right driver |
| * to handle this device |
| */ |
| static int probe(struct usb_interface *intf, const struct usb_device_id *id) |
| { |
| int alt_set, endp; |
| int found = 0; |
| int i, j; |
| int struct_size; |
| struct usb_host_interface *host_interf; |
| struct usb_interface_descriptor *interf_desc; |
| struct usb_host_endpoint *host_endpoint; |
| struct ttusbir_device *ttusbir; |
| |
| DPRINTK("Module ttusbir probe\n"); |
| |
| /* To reduce memory fragmentation we use only one allocation */ |
| struct_size = sizeof(struct ttusbir_device) + |
| (sizeof(struct urb *) * num_urbs) + |
| (sizeof(char *) * num_urbs) + |
| (num_urbs * 128); |
| ttusbir = kzalloc(struct_size, GFP_KERNEL); |
| if (!ttusbir) |
| return -ENOMEM; |
| |
| ttusbir->urb = (struct urb **)((char *)ttusbir + |
| sizeof(struct ttusbir_device)); |
| ttusbir->buffer = (char **)((char *)ttusbir->urb + |
| (sizeof(struct urb *) * num_urbs)); |
| for (i = 0; i < num_urbs; i++) |
| ttusbir->buffer[i] = (char *)ttusbir->buffer + |
| (sizeof(char *)*num_urbs) + (i * 128); |
| |
| ttusbir->usb_driver = &usb_driver; |
| ttusbir->alt_setting = -1; |
| /* @TODO check if error can be returned */ |
| ttusbir->udev = usb_get_dev(interface_to_usbdev(intf)); |
| ttusbir->interf = intf; |
| ttusbir->last_pulse = 0x00; |
| ttusbir->last_num = 0; |
| |
| /* |
| * Now look for interface setting we can handle |
| * We are searching for the alt setting where end point |
| * 0x82 has max packet size 16 |
| */ |
| for (alt_set = 0; alt_set < intf->num_altsetting && !found; alt_set++) { |
| host_interf = &intf->altsetting[alt_set]; |
| interf_desc = &host_interf->desc; |
| for (endp = 0; endp < interf_desc->bNumEndpoints; endp++) { |
| host_endpoint = &host_interf->endpoint[endp]; |
| if ((host_endpoint->desc.bEndpointAddress == 0x82) && |
| (host_endpoint->desc.wMaxPacketSize == 0x10)) { |
| ttusbir->alt_setting = alt_set; |
| ttusbir->endpoint = endp; |
| found = 1; |
| break; |
| } |
| } |
| } |
| if (ttusbir->alt_setting != -1) |
| DPRINTK("alt setting: %d\n", ttusbir->alt_setting); |
| else { |
| err("Could not find alternate setting\n"); |
| kfree(ttusbir); |
| return -EINVAL; |
| } |
| |
| /* OK lets setup this interface setting */ |
| usb_set_interface(ttusbir->udev, 0, ttusbir->alt_setting); |
| |
| /* Store device info in interface structure */ |
| usb_set_intfdata(intf, ttusbir); |
| |
| /* Register as a LIRC driver */ |
| if (lirc_buffer_init(&ttusbir->rbuf, sizeof(int), 256) < 0) { |
| err("Could not get memory for LIRC data buffer\n"); |
| usb_set_intfdata(intf, NULL); |
| kfree(ttusbir); |
| return -ENOMEM; |
| } |
| strcpy(ttusbir->driver.name, "TTUSBIR"); |
| ttusbir->driver.minor = -1; |
| ttusbir->driver.code_length = 1; |
| ttusbir->driver.sample_rate = 0; |
| ttusbir->driver.data = ttusbir; |
| ttusbir->driver.add_to_buf = NULL; |
| ttusbir->driver.rbuf = &ttusbir->rbuf; |
| ttusbir->driver.set_use_inc = set_use_inc; |
| ttusbir->driver.set_use_dec = set_use_dec; |
| ttusbir->driver.dev = &intf->dev; |
| ttusbir->driver.owner = THIS_MODULE; |
| ttusbir->driver.features = LIRC_CAN_REC_MODE2; |
| ttusbir->minor = lirc_register_driver(&ttusbir->driver); |
| if (ttusbir->minor < 0) { |
| err("Error registering as LIRC driver\n"); |
| usb_set_intfdata(intf, NULL); |
| lirc_buffer_free(&ttusbir->rbuf); |
| kfree(ttusbir); |
| return -EIO; |
| } |
| |
| /* Allocate and setup the URB that we will use to talk to the device */ |
| for (i = 0; i < num_urbs; i++) { |
| ttusbir->urb[i] = usb_alloc_urb(8, GFP_KERNEL); |
| if (!ttusbir->urb[i]) { |
| err("Could not allocate memory for the URB\n"); |
| for (j = i - 1; j >= 0; j--) |
| kfree(ttusbir->urb[j]); |
| lirc_buffer_free(&ttusbir->rbuf); |
| lirc_unregister_driver(ttusbir->minor); |
| kfree(ttusbir); |
| usb_set_intfdata(intf, NULL); |
| return -ENOMEM; |
| } |
| ttusbir->urb[i]->dev = ttusbir->udev; |
| ttusbir->urb[i]->context = ttusbir; |
| ttusbir->urb[i]->pipe = usb_rcvisocpipe(ttusbir->udev, |
| ttusbir->endpoint); |
| ttusbir->urb[i]->interval = 1; |
| ttusbir->urb[i]->transfer_flags = URB_ISO_ASAP; |
| ttusbir->urb[i]->transfer_buffer = &ttusbir->buffer[i][0]; |
| ttusbir->urb[i]->complete = urb_complete; |
| ttusbir->urb[i]->number_of_packets = 8; |
| ttusbir->urb[i]->transfer_buffer_length = 128; |
| for (j = 0; j < 8; j++) { |
| ttusbir->urb[i]->iso_frame_desc[j].offset = j*16; |
| ttusbir->urb[i]->iso_frame_desc[j].length = 16; |
| } |
| } |
| return 0; |
| } |
| |
| /** |
| * Called when the driver is unloaded or the device is unplugged |
| */ |
| static void disconnect(struct usb_interface *intf) |
| { |
| int i; |
| struct ttusbir_device *ttusbir; |
| |
| DPRINTK("Module ttusbir disconnect\n"); |
| |
| ttusbir = (struct ttusbir_device *) usb_get_intfdata(intf); |
| usb_set_intfdata(intf, NULL); |
| lirc_unregister_driver(ttusbir->minor); |
| DPRINTK("unregistered\n"); |
| |
| for (i = 0; i < num_urbs; i++) { |
| usb_kill_urb(ttusbir->urb[i]); |
| usb_free_urb(ttusbir->urb[i]); |
| } |
| DPRINTK("URBs killed\n"); |
| lirc_buffer_free(&ttusbir->rbuf); |
| kfree(ttusbir); |
| } |
| |
| static int ttusbir_init_module(void) |
| { |
| int result; |
| |
| DPRINTK(KERN_DEBUG "Module ttusbir init\n"); |
| |
| /* register this driver with the USB subsystem */ |
| result = usb_register(&usb_driver); |
| if (result) |
| err("usb_register failed. Error number %d", result); |
| return result; |
| } |
| |
| static void ttusbir_exit_module(void) |
| { |
| printk(KERN_DEBUG "Module ttusbir exit\n"); |
| usb_deregister(&usb_driver); |
| } |
| |
| module_init(ttusbir_init_module); |
| module_exit(ttusbir_exit_module); |