1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2000-2001 Vojtech Pavlik 4 * Copyright (c) 2000 Mark Fletcher 5 */ 6 7 /* 8 * Gravis Stinger gamepad driver for Linux 9 */ 10 11 /* 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/slab.h> 17 #include <linux/input.h> 18 #include <linux/serio.h> 19 20 #define DRIVER_DESC "Gravis Stinger gamepad driver" 21 22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 23 MODULE_DESCRIPTION(DRIVER_DESC); 24 MODULE_LICENSE("GPL"); 25 26 /* 27 * Constants. 28 */ 29 30 #define STINGER_MAX_LENGTH 8 31 32 /* 33 * Per-Stinger data. 34 */ 35 36 struct stinger { 37 struct input_dev *dev; 38 int idx; 39 unsigned char data[STINGER_MAX_LENGTH]; 40 char phys[32]; 41 }; 42 43 /* 44 * stinger_process_packet() decodes packets the driver receives from the 45 * Stinger. It updates the data accordingly. 46 */ 47 48 static void stinger_process_packet(struct stinger *stinger) 49 { 50 struct input_dev *dev = stinger->dev; 51 unsigned char *data = stinger->data; 52 53 if (!stinger->idx) return; 54 55 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5)); 56 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4)); 57 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3)); 58 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2)); 59 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5)); 60 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4)); 61 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3)); 62 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2)); 63 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1)); 64 input_report_key(dev, BTN_START, (data[3] & 0x01)); 65 66 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6)); 67 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F)); 68 69 input_sync(dev); 70 71 return; 72 } 73 74 /* 75 * stinger_interrupt() is called by the low level driver when characters 76 * are ready for us. We then buffer them for further processing, or call the 77 * packet processing routine. 78 */ 79 80 static irqreturn_t stinger_interrupt(struct serio *serio, 81 unsigned char data, unsigned int flags) 82 { 83 struct stinger *stinger = serio_get_drvdata(serio); 84 85 /* All Stinger packets are 4 bytes */ 86 87 if (stinger->idx < STINGER_MAX_LENGTH) 88 stinger->data[stinger->idx++] = data; 89 90 if (stinger->idx == 4) { 91 stinger_process_packet(stinger); 92 stinger->idx = 0; 93 } 94 95 return IRQ_HANDLED; 96 } 97 98 /* 99 * stinger_disconnect() is the opposite of stinger_connect() 100 */ 101 102 static void stinger_disconnect(struct serio *serio) 103 { 104 struct stinger *stinger = serio_get_drvdata(serio); 105 106 serio_close(serio); 107 serio_set_drvdata(serio, NULL); 108 input_unregister_device(stinger->dev); 109 kfree(stinger); 110 } 111 112 /* 113 * stinger_connect() is the routine that is called when someone adds a 114 * new serio device that supports Stinger protocol and registers it as 115 * an input device. 116 */ 117 118 static int stinger_connect(struct serio *serio, struct serio_driver *drv) 119 { 120 struct stinger *stinger; 121 struct input_dev *input_dev; 122 int err = -ENOMEM; 123 124 stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL); 125 input_dev = input_allocate_device(); 126 if (!stinger || !input_dev) 127 goto fail1; 128 129 stinger->dev = input_dev; 130 snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys); 131 132 input_dev->name = "Gravis Stinger"; 133 input_dev->phys = stinger->phys; 134 input_dev->id.bustype = BUS_RS232; 135 input_dev->id.vendor = SERIO_STINGER; 136 input_dev->id.product = 0x0001; 137 input_dev->id.version = 0x0100; 138 input_dev->dev.parent = &serio->dev; 139 140 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 141 input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) | 142 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) | 143 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) | 144 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT); 145 input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4); 146 input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4); 147 148 serio_set_drvdata(serio, stinger); 149 150 err = serio_open(serio, drv); 151 if (err) 152 goto fail2; 153 154 err = input_register_device(stinger->dev); 155 if (err) 156 goto fail3; 157 158 return 0; 159 160 fail3: serio_close(serio); 161 fail2: serio_set_drvdata(serio, NULL); 162 fail1: input_free_device(input_dev); 163 kfree(stinger); 164 return err; 165 } 166 167 /* 168 * The serio driver structure. 169 */ 170 171 static const struct serio_device_id stinger_serio_ids[] = { 172 { 173 .type = SERIO_RS232, 174 .proto = SERIO_STINGER, 175 .id = SERIO_ANY, 176 .extra = SERIO_ANY, 177 }, 178 { 0 } 179 }; 180 181 MODULE_DEVICE_TABLE(serio, stinger_serio_ids); 182 183 static struct serio_driver stinger_drv = { 184 .driver = { 185 .name = "stinger", 186 }, 187 .description = DRIVER_DESC, 188 .id_table = stinger_serio_ids, 189 .interrupt = stinger_interrupt, 190 .connect = stinger_connect, 191 .disconnect = stinger_disconnect, 192 }; 193 194 module_serio_driver(stinger_drv); 195