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