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input.c

/*
 *   Copyright (c) 2006,2007 Daniel Mack, Tim Ruetz
 *
 *   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/init.h>
#include <linux/usb.h>
#include <linux/usb/input.h>
#include <sound/pcm.h>

#include "device.h"
#include "input.h"

static unsigned short keycode_ak1[] =  { KEY_C, KEY_B, KEY_A };
static unsigned short keycode_rk2[] =  { KEY_1, KEY_2, KEY_3, KEY_4,
                               KEY_5, KEY_6, KEY_7 };
static unsigned short keycode_rk3[] =  { KEY_1, KEY_2, KEY_3, KEY_4,
                               KEY_5, KEY_6, KEY_7, KEY_5, KEY_6 };

static unsigned short keycode_kore[] = {
      KEY_FN_F1,      /* "menu"               */
      KEY_FN_F7,      /* "lcd backlight       */
      KEY_FN_F2,      /* "control"            */
      KEY_FN_F3,      /* "enter"              */
      KEY_FN_F4,      /* "view"               */
      KEY_FN_F5,      /* "esc"                */
      KEY_FN_F6,      /* "sound"              */
      KEY_FN_F8,      /* array spacer, never triggered. */
      KEY_RIGHT,
      KEY_DOWN,
      KEY_UP,
      KEY_LEFT,
      KEY_SOUND,      /* "listen"             */
      KEY_RECORD,
      KEY_PLAYPAUSE,
      KEY_STOP,
      BTN_4,          /* 8 softkeys */
      BTN_3,
      BTN_2,
      BTN_1,
      BTN_8,
      BTN_7,
      BTN_6,
      BTN_5,
      KEY_BRL_DOT4,   /* touch sensitive knobs */
      KEY_BRL_DOT3,
      KEY_BRL_DOT2,
      KEY_BRL_DOT1,
      KEY_BRL_DOT8,
      KEY_BRL_DOT7,
      KEY_BRL_DOT6,
      KEY_BRL_DOT5
};

#define DEG90           (range / 2)
#define DEG180          (range)
#define DEG270          (DEG90 + DEG180)
#define DEG360          (DEG180 * 2)
#define HIGH_PEAK (268)
#define LOW_PEAK  (-7)

/* some of these devices have endless rotation potentiometers
 * built in which use two tapers, 90 degrees phase shifted.
 * this algorithm decodes them to one single value, ranging
 * from 0 to 999 */
static unsigned int decode_erp(unsigned char a, unsigned char b)
{
      int weight_a, weight_b;
      int pos_a, pos_b;
      int ret;
      int range = HIGH_PEAK - LOW_PEAK;
      int mid_value = (HIGH_PEAK + LOW_PEAK) / 2;

      weight_b = abs(mid_value - a) - (range / 2 - 100) / 2;

      if (weight_b < 0)
            weight_b = 0;

      if (weight_b > 100)
            weight_b = 100;

      weight_a = 100 - weight_b;

      if (a < mid_value) {
            /* 0..90 and 270..360 degrees */
            pos_b = b - LOW_PEAK + DEG270;
            if (pos_b >= DEG360)
                  pos_b -= DEG360;
      } else
            /* 90..270 degrees */
            pos_b = HIGH_PEAK - b + DEG90;


      if (b > mid_value)
            /* 0..180 degrees */
            pos_a = a - LOW_PEAK;
      else
            /* 180..360 degrees */
            pos_a = HIGH_PEAK - a + DEG180;

      /* interpolate both slider values, depending on weight factors */
      /* 0..99 x DEG360 */
      ret = pos_a * weight_a + pos_b * weight_b;

      /* normalize to 0..999 */
      ret *= 10;
      ret /= DEG360;

      if (ret < 0)
            ret += 1000;

      if (ret >= 1000)
            ret -= 1000;

      return ret;
}

#undef DEG90
#undef DEG180
#undef DEG270
#undef DEG360
#undef HIGH_PEAK
#undef LOW_PEAK


static void snd_caiaq_input_read_analog(struct snd_usb_caiaqdev *dev,
                              const unsigned char *buf,
                              unsigned int len)
{
      struct input_dev *input_dev = dev->input_dev;

      switch (dev->chip.usb_id) {
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
            input_report_abs(input_dev, ABS_X, (buf[4] << 8) | buf[5]);
            input_report_abs(input_dev, ABS_Y, (buf[0] << 8) | buf[1]);
            input_report_abs(input_dev, ABS_Z, (buf[2] << 8) | buf[3]);
            input_sync(input_dev);
            break;
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
            input_report_abs(input_dev, ABS_X, (buf[0] << 8) | buf[1]);
            input_report_abs(input_dev, ABS_Y, (buf[2] << 8) | buf[3]);
            input_report_abs(input_dev, ABS_Z, (buf[4] << 8) | buf[5]);
            input_sync(input_dev);
            break;
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
            input_report_abs(input_dev, ABS_X, (buf[0] << 8) | buf[1]);
            input_report_abs(input_dev, ABS_Y, (buf[2] << 8) | buf[3]);
            input_report_abs(input_dev, ABS_Z, (buf[4] << 8) | buf[5]);
            input_sync(input_dev);
            break;
      }
}

static void snd_caiaq_input_read_erp(struct snd_usb_caiaqdev *dev,
                             const char *buf, unsigned int len)
{
      struct input_dev *input_dev = dev->input_dev;
      int i;

      switch (dev->chip.usb_id) {
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
            i = decode_erp(buf[0], buf[1]);
            input_report_abs(input_dev, ABS_X, i);
            input_sync(input_dev);
            break;
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
            i = decode_erp(buf[7], buf[5]);
            input_report_abs(input_dev, ABS_HAT0X, i);
            i = decode_erp(buf[12], buf[14]);
            input_report_abs(input_dev, ABS_HAT0Y, i);
            i = decode_erp(buf[15], buf[13]);
            input_report_abs(input_dev, ABS_HAT1X, i);
            i = decode_erp(buf[0], buf[2]);
            input_report_abs(input_dev, ABS_HAT1Y, i);
            i = decode_erp(buf[3], buf[1]);
            input_report_abs(input_dev, ABS_HAT2X, i);
            i = decode_erp(buf[8], buf[10]);
            input_report_abs(input_dev, ABS_HAT2Y, i);
            i = decode_erp(buf[11], buf[9]);
            input_report_abs(input_dev, ABS_HAT3X, i);
            i = decode_erp(buf[4], buf[6]);
            input_report_abs(input_dev, ABS_HAT3Y, i);
            input_sync(input_dev);
            break;
      }
}

static void snd_caiaq_input_read_io(struct snd_usb_caiaqdev *dev,
                            char *buf, unsigned int len)
{
      struct input_dev *input_dev = dev->input_dev;
      unsigned short *keycode = input_dev->keycode;
      int i;

      if (!keycode)
            return;

      if (input_dev->id.product == USB_PID_RIGKONTROL2)
            for (i = 0; i < len; i++)
                  buf[i] = ~buf[i];

      for (i = 0; i < input_dev->keycodemax && i < len * 8; i++)
            input_report_key(input_dev, keycode[i],
                         buf[i / 8] & (1 << (i % 8)));

      if (dev->chip.usb_id ==
            USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER) ||
          dev->chip.usb_id ==
            USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2))
            input_report_abs(dev->input_dev, ABS_MISC, 255 - buf[4]);

      input_sync(input_dev);
}

void snd_usb_caiaq_input_dispatch(struct snd_usb_caiaqdev *dev,
                          char *buf,
                          unsigned int len)
{
      if (!dev->input_dev || len < 1)
            return;

      switch (buf[0]) {
      case EP1_CMD_READ_ANALOG:
            snd_caiaq_input_read_analog(dev, buf + 1, len - 1);
            break;
      case EP1_CMD_READ_ERP:
            snd_caiaq_input_read_erp(dev, buf + 1, len - 1);
            break;
      case EP1_CMD_READ_IO:
            snd_caiaq_input_read_io(dev, buf + 1, len - 1);
            break;
      }
}

int snd_usb_caiaq_input_init(struct snd_usb_caiaqdev *dev)
{
      struct usb_device *usb_dev = dev->chip.dev;
      struct input_dev *input;
      int i, ret;

      input = input_allocate_device();
      if (!input)
            return -ENOMEM;

      usb_make_path(usb_dev, dev->phys, sizeof(dev->phys));
      strlcat(dev->phys, "/input0", sizeof(dev->phys));

      input->name = dev->product_name;
      input->phys = dev->phys;
      usb_to_input_id(usb_dev, &input->id);
      input->dev.parent = &usb_dev->dev;

        switch (dev->chip.usb_id) {
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
            input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
            input->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
                  BIT_MASK(ABS_Z);
            BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_rk2));
            memcpy(dev->keycode, keycode_rk2, sizeof(keycode_rk2));
            input->keycodemax = ARRAY_SIZE(keycode_rk2);
            input_set_abs_params(input, ABS_X, 0, 4096, 0, 10);
            input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10);
            input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10);
            snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0);
            break;
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL3):
            input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
            input->absbit[0] = BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
                  BIT_MASK(ABS_Z);
            BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_rk3));
            memcpy(dev->keycode, keycode_rk3, sizeof(keycode_rk3));
            input->keycodemax = ARRAY_SIZE(keycode_rk3);
            input_set_abs_params(input, ABS_X, 0, 1024, 0, 10);
            input_set_abs_params(input, ABS_Y, 0, 1024, 0, 10);
            input_set_abs_params(input, ABS_Z, 0, 1024, 0, 10);
            snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0);
            break;
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
            input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
            input->absbit[0] = BIT_MASK(ABS_X);
            BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_ak1));
            memcpy(dev->keycode, keycode_ak1, sizeof(keycode_ak1));
            input->keycodemax = ARRAY_SIZE(keycode_ak1);
            input_set_abs_params(input, ABS_X, 0, 999, 0, 10);
            snd_usb_caiaq_set_auto_msg(dev, 1, 0, 5);
            break;
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER):
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_KORECONTROLLER2):
            input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
            input->absbit[0] = BIT_MASK(ABS_HAT0X) | BIT_MASK(ABS_HAT0Y) |
                           BIT_MASK(ABS_HAT1X) | BIT_MASK(ABS_HAT1Y) |
                           BIT_MASK(ABS_HAT2X) | BIT_MASK(ABS_HAT2Y) |
                           BIT_MASK(ABS_HAT3X) | BIT_MASK(ABS_HAT3Y) |
                           BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) |
                           BIT_MASK(ABS_Z);
            input->absbit[BIT_WORD(ABS_MISC)] |= BIT_MASK(ABS_MISC);
            BUILD_BUG_ON(sizeof(dev->keycode) < sizeof(keycode_kore));
            memcpy(dev->keycode, keycode_kore, sizeof(keycode_kore));
            input->keycodemax = ARRAY_SIZE(keycode_kore);
            input_set_abs_params(input, ABS_HAT0X, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_HAT0Y, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_HAT1X, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_HAT1Y, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_HAT2X, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_HAT2Y, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_HAT3X, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_HAT3Y, 0, 999, 0, 10);
            input_set_abs_params(input, ABS_X, 0, 4096, 0, 10);
            input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10);
            input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10);
            input_set_abs_params(input, ABS_MISC, 0, 255, 0, 1);
            snd_usb_caiaq_set_auto_msg(dev, 1, 10, 5);
            break;
      default:
            /* no input methods supported on this device */
            input_free_device(input);
            return 0;
      }

      input->keycode = dev->keycode;
      input->keycodesize = sizeof(unsigned short);
      for (i = 0; i < input->keycodemax; i++)
            __set_bit(dev->keycode[i], input->keybit);

      ret = input_register_device(input);
      if (ret < 0) {
            input_free_device(input);
            return ret;
      }

      dev->input_dev = input;
      return 0;
}

void snd_usb_caiaq_input_free(struct snd_usb_caiaqdev *dev)
{
      if (!dev || !dev->input_dev)
            return;

      input_unregister_device(dev->input_dev);
      dev->input_dev = NULL;
}


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