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caiaq-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/module.h>
#include <linux/moduleparam.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/spinlock.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/rawmidi.h>
#include <sound/pcm.h>
#include "caiaq-device.h"
#include "caiaq-input.h"

#ifdef CONFIG_SND_USB_CAIAQ_INPUT

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

#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 char *buf, unsigned int len)
{
      switch(dev->input_dev->id.product) {
      case USB_PID_RIGKONTROL2:
            input_report_abs(dev->input_dev, ABS_X, (buf[4] << 8) |buf[5]);
            input_report_abs(dev->input_dev, ABS_Y, (buf[0] << 8) |buf[1]);
            input_report_abs(dev->input_dev, ABS_Z, (buf[2] << 8) |buf[3]);
            input_sync(dev->input_dev);
            break;
      }
}

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

      switch(dev->input_dev->id.product) {
      case USB_PID_AK1:
            i = decode_erp(buf[0], buf[1]);
            input_report_abs(dev->input_dev, ABS_X, i);
            input_sync(dev->input_dev);   
            break;
      }
}

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

      if (!keycode)
            return;

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

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

      input_sync(dev->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;

      input->name = dev->product_name;
      input->id.bustype = BUS_USB;
      input->id.vendor  = usb_dev->descriptor.idVendor;
      input->id.product = usb_dev->descriptor.idProduct;
      input->id.version = usb_dev->descriptor.bcdDevice;

        switch (dev->chip.usb_id) {
      case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
            input->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
            input->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_Z);
            input->keycode = keycode_rk2;
            input->keycodesize = sizeof(char);
            input->keycodemax = ARRAY_SIZE(keycode_rk2);
            for (i=0; i<ARRAY_SIZE(keycode_rk2); i++)
                  set_bit(keycode_rk2[i], input->keybit);

            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_AK1):
            input->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
            input->absbit[0] = BIT(ABS_X);
            input->keycode = keycode_ak1;
            input->keycodesize = sizeof(char);
            input->keycodemax = ARRAY_SIZE(keycode_ak1);
            for (i=0; i<ARRAY_SIZE(keycode_ak1); i++)
                  set_bit(keycode_ak1[i], input->keybit);

            input_set_abs_params(input, ABS_X, 0, 999, 0, 10);
            snd_usb_caiaq_set_auto_msg(dev, 1, 0, 5);
            break;
      default:
            /* no input methods supported on this device */
            input_free_device(input);
            return 0;
      }

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

#endif /* CONFIG_SND_USB_CAIAQ_INPUT */


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