595 lines
15 KiB
C
595 lines
15 KiB
C
/*
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* keyspan_remote: USB driver for the Keyspan DMR
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*
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* Copyright (C) 2005 Zymeta Corporation - Michael Downey (downey@zymeta.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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* This driver has been put together with the support of Innosys, Inc.
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* and Keyspan, Inc the manufacturers of the Keyspan USB DMR product.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/usb/input.h>
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#define DRIVER_VERSION "v0.1"
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#define DRIVER_AUTHOR "Michael Downey <downey@zymeta.com>"
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#define DRIVER_DESC "Driver for the USB Keyspan remote control."
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#define DRIVER_LICENSE "GPL"
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/* Parameters that can be passed to the driver. */
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static int debug;
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module_param(debug, int, 0444);
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MODULE_PARM_DESC(debug, "Enable extra debug messages and information");
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/* Vendor and product ids */
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#define USB_KEYSPAN_VENDOR_ID 0x06CD
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#define USB_KEYSPAN_PRODUCT_UIA11 0x0202
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/* Defines for converting the data from the remote. */
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#define ZERO 0x18
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#define ZERO_MASK 0x1F /* 5 bits for a 0 */
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#define ONE 0x3C
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#define ONE_MASK 0x3F /* 6 bits for a 1 */
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#define SYNC 0x3F80
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#define SYNC_MASK 0x3FFF /* 14 bits for a SYNC sequence */
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#define STOP 0x00
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#define STOP_MASK 0x1F /* 5 bits for the STOP sequence */
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#define GAP 0xFF
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#define RECV_SIZE 8 /* The UIA-11 type have a 8 byte limit. */
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/*
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* Table that maps the 31 possible keycodes to input keys.
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* Currently there are 15 and 17 button models so RESERVED codes
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* are blank areas in the mapping.
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*/
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static const unsigned short keyspan_key_table[] = {
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KEY_RESERVED, /* 0 is just a place holder. */
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KEY_RESERVED,
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KEY_STOP,
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KEY_PLAYCD,
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KEY_RESERVED,
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KEY_PREVIOUSSONG,
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KEY_REWIND,
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KEY_FORWARD,
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KEY_NEXTSONG,
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_PAUSE,
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KEY_VOLUMEUP,
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_VOLUMEDOWN,
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KEY_RESERVED,
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KEY_UP,
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KEY_RESERVED,
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KEY_MUTE,
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KEY_LEFT,
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KEY_ENTER,
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KEY_RIGHT,
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KEY_RESERVED,
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KEY_RESERVED,
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KEY_DOWN,
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KEY_RESERVED,
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KEY_KPASTERISK,
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KEY_RESERVED,
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KEY_MENU
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};
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/* table of devices that work with this driver */
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static struct usb_device_id keyspan_table[] = {
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{ USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) },
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{ } /* Terminating entry */
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};
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/* Structure to store all the real stuff that a remote sends to us. */
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struct keyspan_message {
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u16 system;
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u8 button;
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u8 toggle;
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};
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/* Structure used for all the bit testing magic needed to be done. */
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struct bit_tester {
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u32 tester;
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int len;
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int pos;
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int bits_left;
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u8 buffer[32];
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};
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/* Structure to hold all of our driver specific stuff */
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struct usb_keyspan {
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char name[128];
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char phys[64];
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unsigned short keymap[ARRAY_SIZE(keyspan_key_table)];
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struct usb_device *udev;
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struct input_dev *input;
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struct usb_interface *interface;
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struct usb_endpoint_descriptor *in_endpoint;
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struct urb* irq_urb;
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int open;
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dma_addr_t in_dma;
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unsigned char *in_buffer;
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/* variables used to parse messages from remote. */
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struct bit_tester data;
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int stage;
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int toggle;
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};
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static struct usb_driver keyspan_driver;
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/*
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* Debug routine that prints out what we've received from the remote.
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*/
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static void keyspan_print(struct usb_keyspan* dev) /*unsigned char* data)*/
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{
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char codes[4 * RECV_SIZE];
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int i;
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for (i = 0; i < RECV_SIZE; i++)
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snprintf(codes + i * 3, 4, "%02x ", dev->in_buffer[i]);
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dev_info(&dev->udev->dev, "%s\n", codes);
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}
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/*
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* Routine that manages the bit_tester structure. It makes sure that there are
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* at least bits_needed bits loaded into the tester.
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*/
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static int keyspan_load_tester(struct usb_keyspan* dev, int bits_needed)
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{
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if (dev->data.bits_left >= bits_needed)
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return 0;
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/*
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* Somehow we've missed the last message. The message will be repeated
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* though so it's not too big a deal
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*/
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if (dev->data.pos >= dev->data.len) {
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dev_dbg(&dev->interface->dev,
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"%s - Error ran out of data. pos: %d, len: %d\n",
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__func__, dev->data.pos, dev->data.len);
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return -1;
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}
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/* Load as much as we can into the tester. */
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while ((dev->data.bits_left + 7 < (sizeof(dev->data.tester) * 8)) &&
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(dev->data.pos < dev->data.len)) {
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dev->data.tester += (dev->data.buffer[dev->data.pos++] << dev->data.bits_left);
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dev->data.bits_left += 8;
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}
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return 0;
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}
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static void keyspan_report_button(struct usb_keyspan *remote, int button, int press)
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{
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struct input_dev *input = remote->input;
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input_event(input, EV_MSC, MSC_SCAN, button);
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input_report_key(input, remote->keymap[button], press);
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input_sync(input);
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}
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/*
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* Routine that handles all the logic needed to parse out the message from the remote.
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*/
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static void keyspan_check_data(struct usb_keyspan *remote)
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{
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int i;
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int found = 0;
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struct keyspan_message message;
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switch(remote->stage) {
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case 0:
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/*
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* In stage 0 we want to find the start of a message. The remote sends a 0xFF as filler.
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* So the first byte that isn't a FF should be the start of a new message.
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*/
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for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i);
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if (i < RECV_SIZE) {
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memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE);
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remote->data.len = RECV_SIZE;
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remote->data.pos = 0;
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remote->data.tester = 0;
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remote->data.bits_left = 0;
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remote->stage = 1;
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}
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break;
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case 1:
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/*
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* Stage 1 we should have 16 bytes and should be able to detect a
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* SYNC. The SYNC is 14 bits, 7 0's and then 7 1's.
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*/
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memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
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remote->data.len += RECV_SIZE;
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found = 0;
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while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) {
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for (i = 0; i < 8; ++i) {
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if (keyspan_load_tester(remote, 14) != 0) {
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remote->stage = 0;
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return;
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}
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if ((remote->data.tester & SYNC_MASK) == SYNC) {
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remote->data.tester = remote->data.tester >> 14;
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remote->data.bits_left -= 14;
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found = 1;
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break;
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} else {
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remote->data.tester = remote->data.tester >> 1;
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--remote->data.bits_left;
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}
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}
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}
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if (!found) {
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remote->stage = 0;
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remote->data.len = 0;
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} else {
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remote->stage = 2;
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}
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break;
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case 2:
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/*
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* Stage 2 we should have 24 bytes which will be enough for a full
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* message. We need to parse out the system code, button code,
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* toggle code, and stop.
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*/
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memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
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remote->data.len += RECV_SIZE;
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message.system = 0;
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for (i = 0; i < 9; i++) {
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keyspan_load_tester(remote, 6);
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if ((remote->data.tester & ZERO_MASK) == ZERO) {
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message.system = message.system << 1;
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remote->data.tester = remote->data.tester >> 5;
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remote->data.bits_left -= 5;
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} else if ((remote->data.tester & ONE_MASK) == ONE) {
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message.system = (message.system << 1) + 1;
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remote->data.tester = remote->data.tester >> 6;
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remote->data.bits_left -= 6;
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} else {
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dev_err(&remote->interface->dev,
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"%s - Unknown sequence found in system data.\n",
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__func__);
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remote->stage = 0;
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return;
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}
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}
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message.button = 0;
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for (i = 0; i < 5; i++) {
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keyspan_load_tester(remote, 6);
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if ((remote->data.tester & ZERO_MASK) == ZERO) {
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message.button = message.button << 1;
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remote->data.tester = remote->data.tester >> 5;
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remote->data.bits_left -= 5;
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} else if ((remote->data.tester & ONE_MASK) == ONE) {
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message.button = (message.button << 1) + 1;
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remote->data.tester = remote->data.tester >> 6;
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remote->data.bits_left -= 6;
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} else {
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dev_err(&remote->interface->dev,
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"%s - Unknown sequence found in button data.\n",
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__func__);
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remote->stage = 0;
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return;
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}
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}
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keyspan_load_tester(remote, 6);
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if ((remote->data.tester & ZERO_MASK) == ZERO) {
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message.toggle = 0;
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remote->data.tester = remote->data.tester >> 5;
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remote->data.bits_left -= 5;
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} else if ((remote->data.tester & ONE_MASK) == ONE) {
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message.toggle = 1;
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remote->data.tester = remote->data.tester >> 6;
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remote->data.bits_left -= 6;
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} else {
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dev_err(&remote->interface->dev,
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"%s - Error in message, invalid toggle.\n",
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__func__);
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remote->stage = 0;
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return;
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}
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keyspan_load_tester(remote, 5);
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if ((remote->data.tester & STOP_MASK) == STOP) {
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remote->data.tester = remote->data.tester >> 5;
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remote->data.bits_left -= 5;
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} else {
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dev_err(&remote->interface->dev,
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"Bad message received, no stop bit found.\n");
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}
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dev_dbg(&remote->interface->dev,
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"%s found valid message: system: %d, button: %d, toggle: %d\n",
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__func__, message.system, message.button, message.toggle);
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if (message.toggle != remote->toggle) {
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keyspan_report_button(remote, message.button, 1);
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keyspan_report_button(remote, message.button, 0);
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remote->toggle = message.toggle;
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}
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remote->stage = 0;
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break;
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}
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}
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/*
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* Routine for sending all the initialization messages to the remote.
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*/
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static int keyspan_setup(struct usb_device* dev)
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{
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int retval = 0;
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retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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0x11, 0x40, 0x5601, 0x0, NULL, 0, 0);
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if (retval) {
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dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n",
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__func__, retval);
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return(retval);
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}
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retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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0x44, 0x40, 0x0, 0x0, NULL, 0, 0);
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if (retval) {
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dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n",
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__func__, retval);
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return(retval);
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}
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retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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0x22, 0x40, 0x0, 0x0, NULL, 0, 0);
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if (retval) {
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dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n",
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__func__, retval);
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return(retval);
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}
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dev_dbg(&dev->dev, "%s - Setup complete.\n", __func__);
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return(retval);
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}
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/*
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* Routine used to handle a new message that has come in.
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*/
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static void keyspan_irq_recv(struct urb *urb)
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{
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struct usb_keyspan *dev = urb->context;
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int retval;
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/* Check our status in case we need to bail out early. */
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switch (urb->status) {
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case 0:
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break;
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/* Device went away so don't keep trying to read from it. */
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case -ECONNRESET:
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case -ENOENT:
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case -ESHUTDOWN:
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return;
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default:
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goto resubmit;
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}
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if (debug)
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keyspan_print(dev);
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keyspan_check_data(dev);
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resubmit:
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval)
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dev_err(&dev->interface->dev,
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"%s - usb_submit_urb failed with result: %d\n",
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__func__, retval);
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}
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static int keyspan_open(struct input_dev *dev)
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{
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struct usb_keyspan *remote = input_get_drvdata(dev);
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remote->irq_urb->dev = remote->udev;
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if (usb_submit_urb(remote->irq_urb, GFP_KERNEL))
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return -EIO;
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return 0;
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}
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static void keyspan_close(struct input_dev *dev)
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{
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struct usb_keyspan *remote = input_get_drvdata(dev);
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usb_kill_urb(remote->irq_urb);
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}
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static struct usb_endpoint_descriptor *keyspan_get_in_endpoint(struct usb_host_interface *iface)
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{
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struct usb_endpoint_descriptor *endpoint;
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int i;
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for (i = 0; i < iface->desc.bNumEndpoints; ++i) {
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endpoint = &iface->endpoint[i].desc;
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if (usb_endpoint_is_int_in(endpoint)) {
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/* we found our interrupt in endpoint */
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return endpoint;
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}
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}
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return NULL;
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}
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/*
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* Routine that sets up the driver to handle a specific USB device detected on the bus.
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*/
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static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id)
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{
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struct usb_device *udev = interface_to_usbdev(interface);
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struct usb_endpoint_descriptor *endpoint;
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struct usb_keyspan *remote;
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struct input_dev *input_dev;
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int i, error;
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endpoint = keyspan_get_in_endpoint(interface->cur_altsetting);
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if (!endpoint)
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return -ENODEV;
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remote = kzalloc(sizeof(*remote), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!remote || !input_dev) {
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error = -ENOMEM;
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goto fail1;
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}
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remote->udev = udev;
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remote->input = input_dev;
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remote->interface = interface;
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remote->in_endpoint = endpoint;
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remote->toggle = -1; /* Set to -1 so we will always not match the toggle from the first remote message. */
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remote->in_buffer = usb_alloc_coherent(udev, RECV_SIZE, GFP_ATOMIC, &remote->in_dma);
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if (!remote->in_buffer) {
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error = -ENOMEM;
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goto fail1;
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}
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remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!remote->irq_urb) {
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error = -ENOMEM;
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goto fail2;
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}
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error = keyspan_setup(udev);
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if (error) {
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error = -ENODEV;
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goto fail3;
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}
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if (udev->manufacturer)
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strlcpy(remote->name, udev->manufacturer, sizeof(remote->name));
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if (udev->product) {
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if (udev->manufacturer)
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strlcat(remote->name, " ", sizeof(remote->name));
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strlcat(remote->name, udev->product, sizeof(remote->name));
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}
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if (!strlen(remote->name))
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snprintf(remote->name, sizeof(remote->name),
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"USB Keyspan Remote %04x:%04x",
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le16_to_cpu(udev->descriptor.idVendor),
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le16_to_cpu(udev->descriptor.idProduct));
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usb_make_path(udev, remote->phys, sizeof(remote->phys));
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strlcat(remote->phys, "/input0", sizeof(remote->phys));
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memcpy(remote->keymap, keyspan_key_table, sizeof(remote->keymap));
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input_dev->name = remote->name;
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input_dev->phys = remote->phys;
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usb_to_input_id(udev, &input_dev->id);
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input_dev->dev.parent = &interface->dev;
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input_dev->keycode = remote->keymap;
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input_dev->keycodesize = sizeof(unsigned short);
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input_dev->keycodemax = ARRAY_SIZE(remote->keymap);
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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__set_bit(EV_KEY, input_dev->evbit);
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for (i = 0; i < ARRAY_SIZE(keyspan_key_table); i++)
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__set_bit(keyspan_key_table[i], input_dev->keybit);
|
|
__clear_bit(KEY_RESERVED, input_dev->keybit);
|
|
|
|
input_set_drvdata(input_dev, remote);
|
|
|
|
input_dev->open = keyspan_open;
|
|
input_dev->close = keyspan_close;
|
|
|
|
/*
|
|
* 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, endpoint->bEndpointAddress),
|
|
remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote,
|
|
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 */
|
|
error = input_register_device(remote->input);
|
|
if (error)
|
|
goto fail3;
|
|
|
|
/* save our data pointer in this interface device */
|
|
usb_set_intfdata(interface, remote);
|
|
|
|
return 0;
|
|
|
|
fail3: usb_free_urb(remote->irq_urb);
|
|
fail2: usb_free_coherent(udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
|
|
fail1: kfree(remote);
|
|
input_free_device(input_dev);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Routine called when a device is disconnected from the USB.
|
|
*/
|
|
static void keyspan_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct usb_keyspan *remote;
|
|
|
|
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_free_coherent(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
|
|
kfree(remote);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Standard driver set up sections
|
|
*/
|
|
static struct usb_driver keyspan_driver =
|
|
{
|
|
.name = "keyspan_remote",
|
|
.probe = keyspan_probe,
|
|
.disconnect = keyspan_disconnect,
|
|
.id_table = keyspan_table
|
|
};
|
|
|
|
module_usb_driver(keyspan_driver);
|
|
|
|
MODULE_DEVICE_TABLE(usb, keyspan_table);
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE(DRIVER_LICENSE);
|