--- /dev/null
+/*
+ * 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);
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff