diff options
Diffstat (limited to 'drivers/usb/input/keyspan_remote.c')
| -rw-r--r-- | drivers/usb/input/keyspan_remote.c | 633 |
1 files changed, 633 insertions, 0 deletions
diff --git a/drivers/usb/input/keyspan_remote.c b/drivers/usb/input/keyspan_remote.c new file mode 100644 index 0000000..67dc936 --- /dev/null +++ b/drivers/usb/input/keyspan_remote.c @@ -0,0 +1,633 @@ +/* + * keyspan_remote: USB driver for the Keyspan DMR + * + * Copyright (C) 2005 Zymeta Corporation - Michael Downey (downey@zymeta.com) + * + * 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, version 2. + * + * This driver has been put together with the support of Innosys, Inc. + * and Keyspan, Inc the manufacturers of the Keyspan USB DMR product. + */ + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/input.h> +#include <linux/usb.h> + +#define DRIVER_VERSION "v0.1" +#define DRIVER_AUTHOR "Michael Downey <downey@zymeta.com>" +#define DRIVER_DESC "Driver for the USB Keyspan remote control." +#define DRIVER_LICENSE "GPL" + +/* Parameters that can be passed to the driver. */ +static int debug; +module_param(debug, int, 0444); +MODULE_PARM_DESC(debug, "Enable extra debug messages and information"); + +/* Vendor and product ids */ +#define USB_KEYSPAN_VENDOR_ID 0x06CD +#define USB_KEYSPAN_PRODUCT_UIA11 0x0202 + +/* Defines for converting the data from the remote. */ +#define ZERO 0x18 +#define ZERO_MASK 0x1F /* 5 bits for a 0 */ +#define ONE 0x3C +#define ONE_MASK 0x3F /* 6 bits for a 1 */ +#define SYNC 0x3F80 +#define SYNC_MASK 0x3FFF /* 14 bits for a SYNC sequence */ +#define STOP 0x00 +#define STOP_MASK 0x1F /* 5 bits for the STOP sequence */ +#define GAP 0xFF + +#define RECV_SIZE 8 /* The UIA-11 type have a 8 byte limit. */ + +/* table of devices that work with this driver */ +static struct usb_device_id keyspan_table[] = { + { USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) }, + { } /* Terminating entry */ +}; + +/* Structure to store all the real stuff that a remote sends to us. */ +struct keyspan_message { + u16 system; + u8 button; + u8 toggle; +}; + +/* Structure used for all the bit testing magic needed to be done. */ +struct bit_tester { + u32 tester; + int len; + int pos; + int bits_left; + u8 buffer[32]; +}; + +/* Structure to hold all of our driver specific stuff */ +struct usb_keyspan { + char name[128]; + char phys[64]; + struct usb_device* udev; + struct input_dev input; + struct usb_interface* interface; + struct usb_endpoint_descriptor* in_endpoint; + struct urb* irq_urb; + int open; + dma_addr_t in_dma; + unsigned char* in_buffer; + + /* variables used to parse messages from remote. */ + struct bit_tester data; + int stage; + int toggle; +}; + +/* + * Table that maps the 31 possible keycodes to input keys. + * Currently there are 15 and 17 button models so RESERVED codes + * are blank areas in the mapping. + */ +static int keyspan_key_table[] = { + KEY_RESERVED, /* 0 is just a place holder. */ + KEY_RESERVED, + KEY_STOP, + KEY_PLAYCD, + KEY_RESERVED, + KEY_PREVIOUSSONG, + KEY_REWIND, + KEY_FORWARD, + KEY_NEXTSONG, + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + KEY_PAUSE, + KEY_VOLUMEUP, + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + KEY_VOLUMEDOWN, + KEY_RESERVED, + KEY_UP, + KEY_RESERVED, + KEY_MUTE, + KEY_LEFT, + KEY_ENTER, + KEY_RIGHT, + KEY_RESERVED, + KEY_RESERVED, + KEY_DOWN, + KEY_RESERVED, + KEY_KPASTERISK, + KEY_RESERVED, + KEY_MENU +}; + +static struct usb_driver keyspan_driver; + +/* + * Debug routine that prints out what we've received from the remote. + */ +static void keyspan_print(struct usb_keyspan* dev) /*unsigned char* data)*/ +{ + char codes[4*RECV_SIZE]; + int i; + + for (i = 0; i < RECV_SIZE; i++) { + snprintf(codes+i*3, 4, "%02x ", dev->in_buffer[i]); + } + + dev_info(&dev->udev->dev, "%s\n", codes); +} + +/* + * Routine that manages the bit_tester structure. It makes sure that there are + * at least bits_needed bits loaded into the tester. + */ +static int keyspan_load_tester(struct usb_keyspan* dev, int bits_needed) +{ + if (dev->data.bits_left >= bits_needed) + return(0); + + /* + * Somehow we've missed the last message. The message will be repeated + * though so it's not too big a deal + */ + if (dev->data.pos >= dev->data.len) { + dev_dbg(&dev->udev, "%s - Error ran out of data. pos: %d, len: %d\n", + __FUNCTION__, dev->data.pos, dev->data.len); + return(-1); + } + + /* Load as much as we can into the tester. */ + while ((dev->data.bits_left + 7 < (sizeof(dev->data.tester) * 8)) && + (dev->data.pos < dev->data.len)) { + dev->data.tester += (dev->data.buffer[dev->data.pos++] << dev->data.bits_left); + dev->data.bits_left += 8; + } + + return(0); +} + +/* + * Routine that handles all the logic needed to parse out the message from the remote. + */ +static void keyspan_check_data(struct usb_keyspan *remote, struct pt_regs *regs) +{ + int i; + int found = 0; + struct keyspan_message message; + + switch(remote->stage) { + case 0: + /* + * In stage 0 we want to find the start of a message. The remote sends a 0xFF as filler. + * So the first byte that isn't a FF should be the start of a new message. + */ + for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i); + + if (i < RECV_SIZE) { + memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE); + remote->data.len = RECV_SIZE; + remote->data.pos = 0; + remote->data.tester = 0; + remote->data.bits_left = 0; + remote->stage = 1; + } + break; + + case 1: + /* + * Stage 1 we should have 16 bytes and should be able to detect a + * SYNC. The SYNC is 14 bits, 7 0's and then 7 1's. + */ + memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE); + remote->data.len += RECV_SIZE; + + found = 0; + while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) { + for (i = 0; i < 8; ++i) { + if (keyspan_load_tester(remote, 14) != 0) { + remote->stage = 0; + return; + } + + if ((remote->data.tester & SYNC_MASK) == SYNC) { + remote->data.tester = remote->data.tester >> 14; + remote->data.bits_left -= 14; + found = 1; + break; + } else { + remote->data.tester = remote->data.tester >> 1; + --remote->data.bits_left; + } + } + } + + if (!found) { + remote->stage = 0; + remote->data.len = 0; + } else { + remote->stage = 2; + } + break; + + case 2: + /* + * Stage 2 we should have 24 bytes which will be enough for a full + * message. We need to parse out the system code, button code, + * toggle code, and stop. + */ + memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE); + remote->data.len += RECV_SIZE; + + message.system = 0; + for (i = 0; i < 9; i++) { + keyspan_load_tester(remote, 6); + + if ((remote->data.tester & ZERO_MASK) == ZERO) { + message.system = message.system << 1; + remote->data.tester = remote->data.tester >> 5; + remote->data.bits_left -= 5; + } else if ((remote->data.tester & ONE_MASK) == ONE) { + message.system = (message.system << 1) + 1; + remote->data.tester = remote->data.tester >> 6; + remote->data.bits_left -= 6; + } else { + err("%s - Unknown sequence found in system data.\n", __FUNCTION__); + remote->stage = 0; + return; + } + } + + message.button = 0; + for (i = 0; i < 5; i++) { + keyspan_load_tester(remote, 6); + + if ((remote->data.tester & ZERO_MASK) == ZERO) { + message.button = message.button << 1; + remote->data.tester = remote->data.tester >> 5; + remote->data.bits_left -= 5; + } else if ((remote->data.tester & ONE_MASK) == ONE) { + message.button = (message.button << 1) + 1; + remote->data.tester = remote->data.tester >> 6; + remote->data.bits_left -= 6; + } else { + err("%s - Unknown sequence found in button data.\n", __FUNCTION__); + remote->stage = 0; + return; + } + } + + keyspan_load_tester(remote, 6); + if ((remote->data.tester & ZERO_MASK) == ZERO) { + message.toggle = 0; + remote->data.tester = remote->data.tester >> 5; + remote->data.bits_left -= 5; + } else if ((remote->data.tester & ONE_MASK) == ONE) { + message.toggle = 1; + remote->data.tester = remote->data.tester >> 6; + remote->data.bits_left -= 6; + } else { + err("%s - Error in message, invalid toggle.\n", __FUNCTION__); + } + + keyspan_load_tester(remote, 5); + if ((remote->data.tester & STOP_MASK) == STOP) { + remote->data.tester = remote->data.tester >> 5; + remote->data.bits_left -= 5; + } else { + err("Bad message recieved, no stop bit found.\n"); + } + + dev_dbg(&remote->udev, + "%s found valid message: system: %d, button: %d, toggle: %d\n", + __FUNCTION__, message.system, message.button, message.toggle); + + if (message.toggle != remote->toggle) { + input_regs(&remote->input, regs); + input_report_key(&remote->input, keyspan_key_table[message.button], 1); + input_report_key(&remote->input, keyspan_key_table[message.button], 0); + input_sync(&remote->input); + remote->toggle = message.toggle; + } + + remote->stage = 0; + break; + } +} + +/* + * Routine for sending all the initialization messages to the remote. + */ +static int keyspan_setup(struct usb_device* dev) +{ + int retval = 0; + + retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + 0x11, 0x40, 0x5601, 0x0, NULL, 0, 0); + if (retval) { + dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n", + __FUNCTION__, retval); + return(retval); + } + + retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + 0x44, 0x40, 0x0, 0x0, NULL, 0, 0); + if (retval) { + dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n", + __FUNCTION__, retval); + return(retval); + } + + retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + 0x22, 0x40, 0x0, 0x0, NULL, 0, 0); + if (retval) { + dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n", + __FUNCTION__, retval); + return(retval); + } + + dev_dbg(&dev->dev, "%s - Setup complete.\n", __FUNCTION__); + return(retval); +} + +/* + * Routine used to handle a new message that has come in. + */ +static void keyspan_irq_recv(struct urb *urb, struct pt_regs *regs) +{ + struct usb_keyspan *dev = urb->context; + int retval; + + /* Check our status in case we need to bail out early. */ + switch (urb->status) { + case 0: + break; + + /* Device went away so don't keep trying to read from it. */ + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + return; + + default: + goto resubmit; + break; + } + + if (debug) + keyspan_print(dev); + + keyspan_check_data(dev, regs); + +resubmit: + retval = usb_submit_urb(urb, GFP_ATOMIC); + if (retval) + err ("%s - usb_submit_urb failed with result: %d", __FUNCTION__, retval); +} + +static int keyspan_open(struct input_dev *dev) +{ + struct usb_keyspan *remote = dev->private; + + if (remote->open++) + return 0; + + remote->irq_urb->dev = remote->udev; + if (usb_submit_urb(remote->irq_urb, GFP_KERNEL)) { + remote->open--; + return -EIO; + } + + return 0; +} + +static void keyspan_close(struct input_dev *dev) +{ + struct usb_keyspan *remote = dev->private; + + if (!--remote->open) + usb_kill_urb(remote->irq_urb); +} + +/* + * Routine that sets up the driver to handle a specific USB device detected on the bus. + */ +static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id) +{ + int i; + int retval = -ENOMEM; + char path[64]; + char *buf; + struct usb_keyspan *remote = NULL; + struct usb_host_interface *iface_desc; + struct usb_endpoint_descriptor *endpoint; + struct usb_device *udev = usb_get_dev(interface_to_usbdev(interface)); + + /* See if the offered device matches what we can accept */ + if ((udev->descriptor.idVendor != USB_KEYSPAN_VENDOR_ID) || + (udev->descriptor.idProduct != USB_KEYSPAN_PRODUCT_UIA11) ) + return -ENODEV; + + /* allocate memory for our device state and initialize it */ + remote = kmalloc(sizeof(*remote), GFP_KERNEL); + if (remote == NULL) { + err("Out of memory\n"); + goto error; + } + memset(remote, 0x00, sizeof(*remote)); + + remote->udev = udev; + remote->interface = interface; + remote->toggle = -1; /* Set to -1 so we will always not match the toggle from the first remote message. */ + + /* set up the endpoint information */ + /* use only the first in interrupt endpoint */ + iface_desc = interface->cur_altsetting; + for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { + endpoint = &iface_desc->endpoint[i].desc; + + if (!remote->in_endpoint && + (endpoint->bEndpointAddress & USB_DIR_IN) && + ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) { + /* we found our interrupt in endpoint */ + remote->in_endpoint = endpoint; + + remote->in_buffer = usb_buffer_alloc(remote->udev, RECV_SIZE, SLAB_ATOMIC, &remote->in_dma); + if (!remote->in_buffer) { + retval = -ENOMEM; + goto error; + } + } + } + + if (!remote->in_endpoint) { + err("Could not find interrupt input endpoint.\n"); + retval = -ENODEV; + goto error; + } + + remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL); + if (!remote->irq_urb) { + err("Failed to allocate urb.\n"); + retval = -ENOMEM; + goto error; + } + + retval = keyspan_setup(remote->udev); + if (retval) { + err("Failed to setup device.\n"); + retval = -ENODEV; + goto error; + } + + /* + * Setup the input system with the bits we are going to be reporting + */ + remote->input.evbit[0] = BIT(EV_KEY); /* We will only report KEY events. */ + for (i = 0; i < 32; ++i) { + if (keyspan_key_table[i] != KEY_RESERVED) { + set_bit(keyspan_key_table[i], remote->input.keybit); + } + } + + remote->input.private = remote; + remote->input.open = keyspan_open; + remote->input.close = keyspan_close; + + usb_make_path(remote->udev, path, 64); + sprintf(remote->phys, "%s/input0", path); + + remote->input.name = remote->name; + remote->input.phys = remote->phys; + remote->input.id.bustype = BUS_USB; + remote->input.id.vendor = le16_to_cpu(remote->udev->descriptor.idVendor); + remote->input.id.product = le16_to_cpu(remote->udev->descriptor.idProduct); + remote->input.id.version = le16_to_cpu(remote->udev->descriptor.bcdDevice); + + if (!(buf = kmalloc(63, GFP_KERNEL))) { + usb_buffer_free(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma); + kfree(remote); + return -ENOMEM; + } + + if (remote->udev->descriptor.iManufacturer && + usb_string(remote->udev, remote->udev->descriptor.iManufacturer, buf, 63) > 0) + strcat(remote->name, buf); + + if (remote->udev->descriptor.iProduct && + usb_string(remote->udev, remote->udev->descriptor.iProduct, buf, 63) > 0) + sprintf(remote->name, "%s %s", remote->name, buf); + + if (!strlen(remote->name)) + sprintf(remote->name, "USB Keyspan Remote %04x:%04x", + remote->input.id.vendor, remote->input.id.product); + + kfree(buf); + + /* + * Initialize the URB to access the device. The urb gets sent to the device in keyspan_open() + */ + usb_fill_int_urb(remote->irq_urb, + remote->udev, usb_rcvintpipe(remote->udev, remote->in_endpoint->bEndpointAddress), + remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote, + remote->in_endpoint->bInterval); + remote->irq_urb->transfer_dma = remote->in_dma; + remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + /* we can register the device now, as it is ready */ + input_register_device(&remote->input); + + /* save our data pointer in this interface device */ + usb_set_intfdata(interface, remote); + + /* let the user know what node this device is now attached to */ + info("connected: %s on %s", remote->name, path); + return 0; + +error: + /* + * In case of error we need to clean up any allocated buffers + */ + if (remote->irq_urb) + usb_free_urb(remote->irq_urb); + + if (remote->in_buffer) + usb_buffer_free(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma); + + if (remote) + kfree(remote); + + return retval; +} + +/* + * Routine called when a device is disconnected from the USB. + */ +static void keyspan_disconnect(struct usb_interface *interface) +{ + struct usb_keyspan *remote; + + /* prevent keyspan_open() from racing keyspan_disconnect() */ + lock_kernel(); + + remote = usb_get_intfdata(interface); + usb_set_intfdata(interface, NULL); + + if (remote) { /* We have a valid driver structure so clean up everything we allocated. */ + input_unregister_device(&remote->input); + usb_kill_urb(remote->irq_urb); + usb_free_urb(remote->irq_urb); + usb_buffer_free(interface_to_usbdev(interface), RECV_SIZE, remote->in_buffer, remote->in_dma); + kfree(remote); + } + + unlock_kernel(); + + info("USB Keyspan now disconnected"); +} + +/* + * Standard driver set up sections + */ +static struct usb_driver keyspan_driver = +{ + .owner = THIS_MODULE, + .name = "keyspan_remote", + .probe = keyspan_probe, + .disconnect = keyspan_disconnect, + .id_table = keyspan_table +}; + +static int __init usb_keyspan_init(void) +{ + int result; + + /* register this driver with the USB subsystem */ + result = usb_register(&keyspan_driver); + if (result) + err("usb_register failed. Error number %d\n", result); + + return result; +} + +static void __exit usb_keyspan_exit(void) +{ + /* deregister this driver with the USB subsystem */ + usb_deregister(&keyspan_driver); +} + +module_init(usb_keyspan_init); +module_exit(usb_keyspan_exit); + +MODULE_DEVICE_TABLE(usb, keyspan_table); +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE(DRIVER_LICENSE); |
