[ALSA] Add Native Instrument usb audio device support

Add snd-usb-caiaq driver to support caiaq usb-audio devices from
Native Instrument:
	* Native Instruments RigKontrol2
	* Native Instruments Kore Controller
	* Native Instruments Audio Kontrol 1
	* Native Instruments Audio 8 DJ

Signed-off-by: Daniel Mack <daniel@caiaq.org>
Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 246 insertions, 0 deletions

diff --git a/sound/usb/caiaq/caiaq-input.c b/sound/usb/caiaq/caiaq-input.c
new file mode 100644
index 00000000000..3acd12db695
--- /dev/null
+++ b/sound/usb/caiaq/caiaq-input.c
@@ -0,0 +1,246 @@
+/*
+ *   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 */
+