247 lines
6.2 KiB
C
247 lines
6.2 KiB
C
/*
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* Copyright (c) 2006,2007 Daniel Mack, Tim Ruetz
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/input.h>
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#include <linux/usb.h>
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#include <linux/spinlock.h>
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#include <sound/driver.h>
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#include <sound/core.h>
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#include <sound/rawmidi.h>
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#include <sound/pcm.h>
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#include "caiaq-device.h"
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#include "caiaq-input.h"
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#ifdef CONFIG_SND_USB_CAIAQ_INPUT
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static unsigned char keycode_ak1[] = { KEY_C, KEY_B, KEY_A };
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static unsigned char keycode_rk2[] = { KEY_1, KEY_2, KEY_3, KEY_4,
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KEY_5, KEY_6, KEY_7 };
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#define DEG90 (range/2)
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#define DEG180 (range)
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#define DEG270 (DEG90 + DEG180)
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#define DEG360 (DEG180 * 2)
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#define HIGH_PEAK (268)
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#define LOW_PEAK (-7)
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/* some of these devices have endless rotation potentiometers
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* built in which use two tapers, 90 degrees phase shifted.
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* this algorithm decodes them to one single value, ranging
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* from 0 to 999 */
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static unsigned int decode_erp(unsigned char a, unsigned char b)
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{
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int weight_a, weight_b;
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int pos_a, pos_b;
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int ret;
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int range = HIGH_PEAK - LOW_PEAK;
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int mid_value = (HIGH_PEAK + LOW_PEAK) / 2;
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weight_b = abs(mid_value-a) - (range/2 - 100)/2;
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if (weight_b < 0)
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weight_b = 0;
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if (weight_b > 100)
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weight_b = 100;
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weight_a = 100 - weight_b;
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if (a < mid_value) {
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/* 0..90 and 270..360 degrees */
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pos_b = b - LOW_PEAK + DEG270;
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if (pos_b >= DEG360)
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pos_b -= DEG360;
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} else
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/* 90..270 degrees */
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pos_b = HIGH_PEAK - b + DEG90;
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if (b > mid_value)
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/* 0..180 degrees */
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pos_a = a - LOW_PEAK;
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else
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/* 180..360 degrees */
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pos_a = HIGH_PEAK - a + DEG180;
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/* interpolate both slider values, depending on weight factors */
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/* 0..99 x DEG360 */
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ret = pos_a * weight_a + pos_b * weight_b;
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/* normalize to 0..999 */
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ret *= 10;
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ret /= DEG360;
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if (ret < 0)
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ret += 1000;
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if (ret >= 1000)
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ret -= 1000;
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return ret;
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}
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#undef DEG90
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#undef DEG180
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#undef DEG270
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#undef DEG360
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#undef HIGH_PEAK
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#undef LOW_PEAK
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static void snd_caiaq_input_read_analog(struct snd_usb_caiaqdev *dev,
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const char *buf, unsigned int len)
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{
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switch(dev->input_dev->id.product) {
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case USB_PID_RIGKONTROL2:
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input_report_abs(dev->input_dev, ABS_X, (buf[4] << 8) |buf[5]);
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input_report_abs(dev->input_dev, ABS_Y, (buf[0] << 8) |buf[1]);
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input_report_abs(dev->input_dev, ABS_Z, (buf[2] << 8) |buf[3]);
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input_sync(dev->input_dev);
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break;
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}
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}
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static void snd_caiaq_input_read_erp(struct snd_usb_caiaqdev *dev,
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const char *buf, unsigned int len)
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{
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int i;
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switch(dev->input_dev->id.product) {
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case USB_PID_AK1:
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i = decode_erp(buf[0], buf[1]);
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input_report_abs(dev->input_dev, ABS_X, i);
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input_sync(dev->input_dev);
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break;
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}
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}
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static void snd_caiaq_input_read_io(struct snd_usb_caiaqdev *dev,
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char *buf, unsigned int len)
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{
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int i;
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unsigned char *keycode = dev->input_dev->keycode;
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if (!keycode)
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return;
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if (dev->input_dev->id.product == USB_PID_RIGKONTROL2)
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for (i=0; i<len; i++)
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buf[i] = ~buf[i];
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for (i=0; (i<dev->input_dev->keycodemax) && (i < len); i++)
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input_report_key(dev->input_dev, keycode[i],
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buf[i/8] & (1 << (i%8)));
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input_sync(dev->input_dev);
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}
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void snd_usb_caiaq_input_dispatch(struct snd_usb_caiaqdev *dev,
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char *buf,
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unsigned int len)
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{
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if (!dev->input_dev || (len < 1))
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return;
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switch (buf[0]) {
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case EP1_CMD_READ_ANALOG:
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snd_caiaq_input_read_analog(dev, buf+1, len-1);
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break;
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case EP1_CMD_READ_ERP:
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snd_caiaq_input_read_erp(dev, buf+1, len-1);
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break;
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case EP1_CMD_READ_IO:
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snd_caiaq_input_read_io(dev, buf+1, len-1);
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break;
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}
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}
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int snd_usb_caiaq_input_init(struct snd_usb_caiaqdev *dev)
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{
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struct usb_device *usb_dev = dev->chip.dev;
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struct input_dev *input;
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int i, ret;
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input = input_allocate_device();
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if (!input)
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return -ENOMEM;
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input->name = dev->product_name;
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input->id.bustype = BUS_USB;
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input->id.vendor = usb_dev->descriptor.idVendor;
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input->id.product = usb_dev->descriptor.idProduct;
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input->id.version = usb_dev->descriptor.bcdDevice;
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switch (dev->chip.usb_id) {
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case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2):
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input->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_Z);
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input->keycode = keycode_rk2;
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input->keycodesize = sizeof(char);
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input->keycodemax = ARRAY_SIZE(keycode_rk2);
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for (i=0; i<ARRAY_SIZE(keycode_rk2); i++)
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set_bit(keycode_rk2[i], input->keybit);
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input_set_abs_params(input, ABS_X, 0, 4096, 0, 10);
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input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10);
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input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10);
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snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0);
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break;
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case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1):
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input->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input->absbit[0] = BIT(ABS_X);
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input->keycode = keycode_ak1;
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input->keycodesize = sizeof(char);
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input->keycodemax = ARRAY_SIZE(keycode_ak1);
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for (i=0; i<ARRAY_SIZE(keycode_ak1); i++)
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set_bit(keycode_ak1[i], input->keybit);
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input_set_abs_params(input, ABS_X, 0, 999, 0, 10);
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snd_usb_caiaq_set_auto_msg(dev, 1, 0, 5);
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break;
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default:
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/* no input methods supported on this device */
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input_free_device(input);
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return 0;
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}
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ret = input_register_device(input);
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if (ret < 0) {
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input_free_device(input);
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return ret;
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}
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dev->input_dev = input;
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return 0;
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}
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void snd_usb_caiaq_input_free(struct snd_usb_caiaqdev *dev)
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{
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if (!dev || !dev->input_dev)
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return;
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input_unregister_device(dev->input_dev);
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input_free_device(dev->input_dev);
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dev->input_dev = NULL;
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}
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#endif /* CONFIG_SND_USB_CAIAQ_INPUT */
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