Daniel Mack | 523f1dc | 2007-03-26 19:11:24 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2006,2007 Daniel Mack, Tim Ruetz |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/moduleparam.h> |
| 22 | #include <linux/input.h> |
| 23 | #include <linux/usb.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | #include <sound/driver.h> |
| 26 | #include <sound/core.h> |
| 27 | #include <sound/rawmidi.h> |
| 28 | #include <sound/pcm.h> |
| 29 | #include "caiaq-device.h" |
| 30 | #include "caiaq-input.h" |
| 31 | |
| 32 | #ifdef CONFIG_SND_USB_CAIAQ_INPUT |
| 33 | |
| 34 | static unsigned char keycode_ak1[] = { KEY_C, KEY_B, KEY_A }; |
| 35 | static unsigned char keycode_rk2[] = { KEY_1, KEY_2, KEY_3, KEY_4, |
| 36 | KEY_5, KEY_6, KEY_7 }; |
| 37 | |
| 38 | #define DEG90 (range/2) |
| 39 | #define DEG180 (range) |
| 40 | #define DEG270 (DEG90 + DEG180) |
| 41 | #define DEG360 (DEG180 * 2) |
| 42 | #define HIGH_PEAK (268) |
| 43 | #define LOW_PEAK (-7) |
| 44 | |
| 45 | /* some of these devices have endless rotation potentiometers |
| 46 | * built in which use two tapers, 90 degrees phase shifted. |
| 47 | * this algorithm decodes them to one single value, ranging |
| 48 | * from 0 to 999 */ |
| 49 | static unsigned int decode_erp(unsigned char a, unsigned char b) |
| 50 | { |
| 51 | int weight_a, weight_b; |
| 52 | int pos_a, pos_b; |
| 53 | int ret; |
| 54 | int range = HIGH_PEAK - LOW_PEAK; |
| 55 | int mid_value = (HIGH_PEAK + LOW_PEAK) / 2; |
| 56 | |
| 57 | weight_b = abs(mid_value-a) - (range/2 - 100)/2; |
| 58 | |
| 59 | if (weight_b < 0) |
| 60 | weight_b = 0; |
| 61 | |
| 62 | if (weight_b > 100) |
| 63 | weight_b = 100; |
| 64 | |
| 65 | weight_a = 100 - weight_b; |
| 66 | |
| 67 | if (a < mid_value) { |
| 68 | /* 0..90 and 270..360 degrees */ |
| 69 | pos_b = b - LOW_PEAK + DEG270; |
| 70 | if (pos_b >= DEG360) |
| 71 | pos_b -= DEG360; |
| 72 | } else |
| 73 | /* 90..270 degrees */ |
| 74 | pos_b = HIGH_PEAK - b + DEG90; |
| 75 | |
| 76 | |
| 77 | if (b > mid_value) |
| 78 | /* 0..180 degrees */ |
| 79 | pos_a = a - LOW_PEAK; |
| 80 | else |
| 81 | /* 180..360 degrees */ |
| 82 | pos_a = HIGH_PEAK - a + DEG180; |
| 83 | |
| 84 | /* interpolate both slider values, depending on weight factors */ |
| 85 | /* 0..99 x DEG360 */ |
| 86 | ret = pos_a * weight_a + pos_b * weight_b; |
| 87 | |
| 88 | /* normalize to 0..999 */ |
| 89 | ret *= 10; |
| 90 | ret /= DEG360; |
| 91 | |
| 92 | if (ret < 0) |
| 93 | ret += 1000; |
| 94 | |
| 95 | if (ret >= 1000) |
| 96 | ret -= 1000; |
| 97 | |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | #undef DEG90 |
| 102 | #undef DEG180 |
| 103 | #undef DEG270 |
| 104 | #undef DEG360 |
| 105 | #undef HIGH_PEAK |
| 106 | #undef LOW_PEAK |
| 107 | |
| 108 | |
| 109 | static void snd_caiaq_input_read_analog(struct snd_usb_caiaqdev *dev, |
| 110 | const char *buf, unsigned int len) |
| 111 | { |
| 112 | switch(dev->input_dev->id.product) { |
| 113 | case USB_PID_RIGKONTROL2: |
| 114 | input_report_abs(dev->input_dev, ABS_X, (buf[4] << 8) |buf[5]); |
| 115 | input_report_abs(dev->input_dev, ABS_Y, (buf[0] << 8) |buf[1]); |
| 116 | input_report_abs(dev->input_dev, ABS_Z, (buf[2] << 8) |buf[3]); |
| 117 | input_sync(dev->input_dev); |
| 118 | break; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | static void snd_caiaq_input_read_erp(struct snd_usb_caiaqdev *dev, |
| 123 | const char *buf, unsigned int len) |
| 124 | { |
| 125 | int i; |
| 126 | |
| 127 | switch(dev->input_dev->id.product) { |
| 128 | case USB_PID_AK1: |
| 129 | i = decode_erp(buf[0], buf[1]); |
| 130 | input_report_abs(dev->input_dev, ABS_X, i); |
| 131 | input_sync(dev->input_dev); |
| 132 | break; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static void snd_caiaq_input_read_io(struct snd_usb_caiaqdev *dev, |
| 137 | char *buf, unsigned int len) |
| 138 | { |
| 139 | int i; |
| 140 | unsigned char *keycode = dev->input_dev->keycode; |
| 141 | |
| 142 | if (!keycode) |
| 143 | return; |
| 144 | |
| 145 | if (dev->input_dev->id.product == USB_PID_RIGKONTROL2) |
| 146 | for (i=0; i<len; i++) |
| 147 | buf[i] = ~buf[i]; |
| 148 | |
| 149 | for (i=0; (i<dev->input_dev->keycodemax) && (i < len); i++) |
| 150 | input_report_key(dev->input_dev, keycode[i], |
| 151 | buf[i/8] & (1 << (i%8))); |
| 152 | |
| 153 | input_sync(dev->input_dev); |
| 154 | } |
| 155 | |
| 156 | void snd_usb_caiaq_input_dispatch(struct snd_usb_caiaqdev *dev, |
| 157 | char *buf, |
| 158 | unsigned int len) |
| 159 | { |
| 160 | if (!dev->input_dev || (len < 1)) |
| 161 | return; |
| 162 | |
| 163 | switch (buf[0]) { |
| 164 | case EP1_CMD_READ_ANALOG: |
| 165 | snd_caiaq_input_read_analog(dev, buf+1, len-1); |
| 166 | break; |
| 167 | case EP1_CMD_READ_ERP: |
| 168 | snd_caiaq_input_read_erp(dev, buf+1, len-1); |
| 169 | break; |
| 170 | case EP1_CMD_READ_IO: |
| 171 | snd_caiaq_input_read_io(dev, buf+1, len-1); |
| 172 | break; |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | int snd_usb_caiaq_input_init(struct snd_usb_caiaqdev *dev) |
| 177 | { |
| 178 | struct usb_device *usb_dev = dev->chip.dev; |
| 179 | struct input_dev *input; |
| 180 | int i, ret; |
| 181 | |
| 182 | input = input_allocate_device(); |
| 183 | if (!input) |
| 184 | return -ENOMEM; |
| 185 | |
| 186 | input->name = dev->product_name; |
| 187 | input->id.bustype = BUS_USB; |
| 188 | input->id.vendor = usb_dev->descriptor.idVendor; |
| 189 | input->id.product = usb_dev->descriptor.idProduct; |
| 190 | input->id.version = usb_dev->descriptor.bcdDevice; |
| 191 | |
| 192 | switch (dev->chip.usb_id) { |
| 193 | case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_RIGKONTROL2): |
| 194 | input->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
| 195 | input->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_Z); |
| 196 | input->keycode = keycode_rk2; |
| 197 | input->keycodesize = sizeof(char); |
| 198 | input->keycodemax = ARRAY_SIZE(keycode_rk2); |
| 199 | for (i=0; i<ARRAY_SIZE(keycode_rk2); i++) |
| 200 | set_bit(keycode_rk2[i], input->keybit); |
| 201 | |
| 202 | input_set_abs_params(input, ABS_X, 0, 4096, 0, 10); |
| 203 | input_set_abs_params(input, ABS_Y, 0, 4096, 0, 10); |
| 204 | input_set_abs_params(input, ABS_Z, 0, 4096, 0, 10); |
| 205 | snd_usb_caiaq_set_auto_msg(dev, 1, 10, 0); |
| 206 | break; |
| 207 | case USB_ID(USB_VID_NATIVEINSTRUMENTS, USB_PID_AK1): |
| 208 | input->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); |
| 209 | input->absbit[0] = BIT(ABS_X); |
| 210 | input->keycode = keycode_ak1; |
| 211 | input->keycodesize = sizeof(char); |
| 212 | input->keycodemax = ARRAY_SIZE(keycode_ak1); |
| 213 | for (i=0; i<ARRAY_SIZE(keycode_ak1); i++) |
| 214 | set_bit(keycode_ak1[i], input->keybit); |
| 215 | |
| 216 | input_set_abs_params(input, ABS_X, 0, 999, 0, 10); |
| 217 | snd_usb_caiaq_set_auto_msg(dev, 1, 0, 5); |
| 218 | break; |
| 219 | default: |
| 220 | /* no input methods supported on this device */ |
| 221 | input_free_device(input); |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | ret = input_register_device(input); |
| 226 | if (ret < 0) { |
| 227 | input_free_device(input); |
| 228 | return ret; |
| 229 | } |
| 230 | |
| 231 | dev->input_dev = input; |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | void snd_usb_caiaq_input_free(struct snd_usb_caiaqdev *dev) |
| 236 | { |
| 237 | if (!dev || !dev->input_dev) |
| 238 | return; |
| 239 | |
| 240 | input_unregister_device(dev->input_dev); |
| 241 | input_free_device(dev->input_dev); |
| 242 | dev->input_dev = NULL; |
| 243 | } |
| 244 | |
| 245 | #endif /* CONFIG_SND_USB_CAIAQ_INPUT */ |
| 246 | |